From: Yuan-Hsin Chen <yuanlmm@gmail.com>
To: gregkh@linuxfoundation.org, stern@rowland.harvard.edu,
sarah.a.sharp@linux.intel.com, balbi@ti.com,
Julia.Lawall@lip6.fr
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Yuan-Hsin Chen <yhchen@faraday-tech.com>
Subject: [PATCH] usb host: Faraday FUSBH200 HCD driver.
Date: Wed, 6 Feb 2013 19:24:01 +0800 [thread overview]
Message-ID: <1360149841-2392-1-git-send-email-yuanlmm@gmail.com> (raw)
From: Yuan-Hsin Chen <yhchen@faraday-tech.com>
USB2.0 HCD driver for Faraday FUSBH200
Signed-off-by: Yuan-Hsin Chen <yhchen@faraday-tech.com>
---
drivers/usb/Makefile | 2 +-
drivers/usb/host/Kconfig | 7 +
drivers/usb/host/Makefile | 2 +
drivers/usb/host/fusbh200-hcd.c | 6830 +++++++++++++++++++++++++++++++++++++++
drivers/usb/host/fusbh200.h | 907 ++++++
5 files changed, 7747 insertions(+), 1 deletions(-)
create mode 100644 drivers/usb/host/fusbh200-hcd.c
create mode 100644 drivers/usb/host/fusbh200.h
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index f5ed3d7..a9f450a 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -3,7 +3,6 @@
#
# Object files in subdirectories
-
obj-$(CONFIG_USB) += core/
obj-$(CONFIG_USB_OTG_UTILS) += otg/
@@ -27,6 +26,7 @@ obj-$(CONFIG_USB_HWA_HCD) += host/
obj-$(CONFIG_USB_ISP1760_HCD) += host/
obj-$(CONFIG_USB_IMX21_HCD) += host/
obj-$(CONFIG_USB_FSL_MPH_DR_OF) += host/
+obj-$(CONFIG_USB_FUSBH200_HCD) += host/
obj-$(CONFIG_USB_C67X00_HCD) += c67x00/
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 3f1431d..7e72131 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -675,3 +675,10 @@ config USB_HCD_SSB
for ehci and ohci.
If unsure, say N.
+
+config USB_FUSBH200_HCD
+ tristate "Faraday FUSBH200 HCD support"
+ depends on USB
+ ---help---
+ The USB HCD Driver of Faraday FUSBH200 is designed to
+ meet USB2.0 EHCI specification with minor modification
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 9e0a89c..404207e 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_USB_WHCI_HCD) += whci/
obj-$(CONFIG_PCI) += pci-quirks.o
obj-$(CONFIG_USB_EHCI_HCD) += ehci-hcd.o
+
obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o
obj-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o
obj-$(CONFIG_USB_ISP1362_HCD) += isp1362-hcd.o
@@ -43,3 +44,4 @@ obj-$(CONFIG_USB_OCTEON2_COMMON) += octeon2-common.o
obj-$(CONFIG_MIPS_ALCHEMY) += alchemy-common.o
obj-$(CONFIG_USB_HCD_BCMA) += bcma-hcd.o
obj-$(CONFIG_USB_HCD_SSB) += ssb-hcd.o
+obj-$(CONFIG_USB_FUSBH200_HCD) += fusbh200-hcd.o
diff --git a/drivers/usb/host/fusbh200-hcd.c b/drivers/usb/host/fusbh200-hcd.c
new file mode 100644
index 0000000..117c30a
--- /dev/null
+++ b/drivers/usb/host/fusbh200-hcd.c
@@ -0,0 +1,6830 @@
+/*
+ * Copyright (c) 2013 Yuan-Hsin Chen <yhchen@faraday-tech>
+ * Copyright (c) 2000-2004 by David Brownell
+ *
+ * This code is *strongly* based on EHCI-HCD code by David Brownell since
+ * fusbh200 is a quasi-EHCI compatible IP.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/vmalloc.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/timer.h>
+#include <linux/ktime.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/moduleparam.h>
+#include <linux/dma-mapping.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/platform_device.h>
+#include <linux/dmapool.h>
+#include <linux/slab.h>
+#include <linux/usb/ulpi.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/timer.h>
+
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+/*
+ * EHCI hc_driver implementation ... experimental, incomplete.
+ * Based on the final 1.0 register interface specification.
+ *
+ * USB 2.0 shows up in upcoming www.pcmcia.org technology.
+ * First was PCMCIA, like ISA; then CardBus, which is PCI.
+ * Next comes "CardBay", using USB 2.0 signals.
+ *
+ * Contains additional contributions by Brad Hards, Rory Bolt, and others.
+ * Special thanks to Intel and VIA for providing host controllers to
+ * test this driver on, and Cypress (including In-System Design) for
+ * providing early devices for those host controllers to talk to!
+ */
+
+#define DRIVER_AUTHOR "Yuan-Hsin Chen"
+#define DRIVER_DESC "Faraday Fusbh200 Host Controller (EHCI) Driver"
+static const char hcd_name[] = "fusbh200_hcd";
+
+#undef VERBOSE_DEBUG
+#undef EHCI_URB_TRACE
+
+#ifdef DEBUG
+#define EHCI_STATS
+#endif
+
+/* magic numbers that can affect system performance */
+#define EHCI_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
+#define EHCI_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
+#define EHCI_TUNE_RL_TT 0
+#define EHCI_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
+#define EHCI_TUNE_MULT_TT 1
+/*
+ * Some drivers think it's safe to schedule isochronous transfers more than
+ * 256 ms into the future (partly as a result of an old bug in the scheduling
+ * code). In an attempt to avoid trouble, we will use a minimum scheduling
+ * length of 512 frames instead of 256.
+ */
+#define EHCI_TUNE_FLS 1 /* (medium) 512-frame schedule */
+#define EHCI_IAA_MSECS 10 /* arbitrary */
+#define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */
+#define EHCI_ASYNC_JIFFIES 0 /* async idle timeout */
+#define EHCI_SHRINK_JIFFIES 0
+ /* 5-ms async qh unlink delay */
+
+/* Initial IRQ latency: faster than hw default */
+static int log2_irq_thresh;/* 0 to 6 */
+module_param(log2_irq_thresh, int, S_IRUGO);
+MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
+
+/* initial park setting: slower than hw default */
+static unsigned park;
+module_param(park, uint, S_IRUGO);
+MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets");
+
+/* for flakey hardware, ignore overcurrent indicators */
+static bool ignore_oc;
+module_param(ignore_oc, bool, S_IRUGO);
+MODULE_PARM_DESC(ignore_oc, "ignore bogus hardware overcurrent indications");
+
+#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
+
+#include "fusbh200.h"
+
+#define ehci_dbg(ehci, fmt, args...) \
+ dev_dbg(ehci_to_hcd(ehci)->self.controller , fmt , ## args)
+#define ehci_err(ehci, fmt, args...) \
+ dev_err(ehci_to_hcd(ehci)->self.controller , fmt , ## args)
+#define ehci_info(ehci, fmt, args...) \
+ dev_info(ehci_to_hcd(ehci)->self.controller , fmt , ## args)
+#define ehci_warn(ehci, fmt, args...) \
+ dev_warn(ehci_to_hcd(ehci)->self.controller , fmt , ## args)
+
+#ifdef VERBOSE_DEBUG
+#define ehci_vdbg ehci_dbg
+#else
+static inline void ehci_vdbg(struct ehci_hcd *ehci, ...) {}
+#endif
+
+#ifdef DEBUG
+/* check the values in the HCSPARAMS register
+ * (host controller _Structural_ parameters)
+ * see EHCI spec, Table 2-4 for each value
+ */
+static void dbg_hcs_params(struct ehci_hcd *ehci, char *label)
+{
+ u32 params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+ ehci_dbg(ehci,
+ "%s hcs_params 0x%x dbg=%d%s cc=%d pcc=%d%s%s ports=%d\n",
+ label, params,
+ HCS_DEBUG_PORT(params),
+ HCS_INDICATOR(params) ? " ind" : "",
+ HCS_N_CC(params),
+ HCS_N_PCC(params),
+ HCS_PORTROUTED(params) ? "" : " ordered",
+ HCS_PPC(params) ? "" : " !ppc",
+ HCS_N_PORTS(params)
+ );
+ /* Port routing, per EHCI 0.95 Spec, Section 2.2.5 */
+ if (HCS_PORTROUTED(params)) {
+ int i;
+ char buf[46], tmp[7], byte;
+
+ buf[0] = 0;
+ for (i = 0; i < HCS_N_PORTS(params); i++) {
+ /* FIXME MIPS won't readb() ...*/
+ byte = readb(&ehci->caps->portroute[(i>>1)]);
+ sprintf(tmp, "%d ",
+ ((i & 0x1) ? ((byte)&0xf) : ((byte>>4)&0xf)));
+ strcat(buf, tmp);
+ }
+ ehci_dbg(ehci, "%s portroute %s\n",
+ label, buf);
+ }
+}
+
+/* check the values in the HCCPARAMS register
+ * (host controller _Capability_ parameters)
+ * see EHCI Spec, Table 2-5 for each value
+ * */
+static void dbg_hcc_params(struct ehci_hcd *ehci, char *label)
+{
+ u32 params = ehci_readl(ehci, &ehci->caps->hcc_params);
+
+ if (HCC_ISOC_CACHE(params)) {
+ ehci_dbg(ehci,
+ "%s hcc_params %04x caching frame %s%s%s\n",
+ label, params,
+ HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
+ HCC_CANPARK(params) ? " park" : "",
+ HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
+ } else {
+ ehci_dbg(ehci,
+ "%s hcc_params %04x thresh %d uframes %s%s%s\n",
+ label,
+ params,
+ HCC_ISOC_THRES(params),
+ HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
+ HCC_CANPARK(params) ? " park" : "",
+ HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
+ }
+}
+
+static void __maybe_unused
+dbg_qtd(const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd)
+{
+ ehci_dbg(ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
+ hc32_to_cpup(ehci, &qtd->hw_next),
+ hc32_to_cpup(ehci, &qtd->hw_alt_next),
+ hc32_to_cpup(ehci, &qtd->hw_token),
+ hc32_to_cpup(ehci, &qtd->hw_buf[0]));
+ if (qtd->hw_buf[1])
+ ehci_dbg(ehci, " p1=%08x p2=%08x p3=%08x p4=%08x\n",
+ hc32_to_cpup(ehci, &qtd->hw_buf[1]),
+ hc32_to_cpup(ehci, &qtd->hw_buf[2]),
+ hc32_to_cpup(ehci, &qtd->hw_buf[3]),
+ hc32_to_cpup(ehci, &qtd->hw_buf[4]));
+}
+
+static void __maybe_unused
+dbg_qh(const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ struct ehci_qh_hw *hw = qh->hw;
+
+ ehci_dbg(ehci, "%s qh %p n%08x info %x %x qtd %x\n", label,
+ qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
+ dbg_qtd("overlay", ehci, (struct ehci_qtd *) &hw->hw_qtd_next);
+}
+
+static int __maybe_unused
+dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
+{
+ return scnprintf(buf, len,
+ "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
+ label, label[0] ? " " : "", status,
+ (status & STS_ASS) ? " Async" : "",
+ (status & STS_PSS) ? " Periodic" : "",
+ (status & STS_RECL) ? " Recl" : "",
+ (status & STS_HALT) ? " Halt" : "",
+ (status & STS_IAA) ? " IAA" : "",
+ (status & STS_FATAL) ? " FATAL" : "",
+ (status & STS_FLR) ? " FLR" : "",
+ (status & STS_PCD) ? " PCD" : "",
+ (status & STS_ERR) ? " ERR" : "",
+ (status & STS_INT) ? " INT" : ""
+ );
+}
+
+static int __maybe_unused
+dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
+{
+ return scnprintf(buf, len,
+ "%s%sintrenable %02x%s%s%s%s%s%s",
+ label, label[0] ? " " : "", enable,
+ (enable & STS_IAA) ? " IAA" : "",
+ (enable & STS_FATAL) ? " FATAL" : "",
+ (enable & STS_FLR) ? " FLR" : "",
+ (enable & STS_PCD) ? " PCD" : "",
+ (enable & STS_ERR) ? " ERR" : "",
+ (enable & STS_INT) ? " INT" : ""
+ );
+}
+
+static const char *const fls_strings[] = {"1024", "512", "256", "??"};
+
+static int
+dbg_command_buf(char *buf, unsigned len, const char *label, u32 command)
+{
+ return scnprintf(buf, len,
+ "%s%scommand %07x %s=%d ithresh=%d%s%s%s%s "
+ "period=%s%s %s",
+ label, label[0] ? " " : "", command,
+ (command & CMD_PARK) ? " park" : "(park)",
+ CMD_PARK_CNT(command),
+ (command >> 16) & 0x3f,
+ (command & CMD_LRESET) ? " LReset" : "",
+ (command & CMD_IAAD) ? " IAAD" : "",
+ (command & CMD_ASE) ? " Async" : "",
+ (command & CMD_PSE) ? " Periodic" : "",
+ fls_strings[(command >> 2) & 0x3],
+ (command & CMD_RESET) ? " Reset" : "",
+ (command & CMD_RUN) ? "RUN" : "HALT"
+ );
+}
+
+static void
+dbg_command_reg(struct ehci_hcd *ehci)
+{
+ u32 command = ehci_readl(ehci, &ehci->regs->command);
+ ehci_dbg(ehci, "command %07x %s=%d ithresh=%d%s%s%s%s period=%s%s %s\n",
+ command,
+ (command & CMD_PARK) ? " park" : "(park)",
+ CMD_PARK_CNT(command),
+ (command >> 16) & 0x3f,
+ (command & CMD_LRESET) ? " LReset" : "",
+ (command & CMD_IAAD) ? " IAAD" : "",
+ (command & CMD_ASE) ? " Async" : "",
+ (command & CMD_PSE) ? " Periodic" : "",
+ fls_strings[(command >> 2) & 0x3],
+ (command & CMD_RESET) ? " Reset" : "",
+ (command & CMD_RUN) ? "RUN" : "HALT"
+ );
+}
+
+static int
+dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status)
+{
+ char *sig;
+
+ /* signaling state */
+ switch (status & (3 << 10)) {
+ case 0 << 10:
+ sig = "se0"; break;
+ case 1 << 10:
+ sig = "k"; break; /* low speed */
+ case 2 << 10:
+ sig = "j"; break;
+ default:
+ sig = "?"; break;
+ }
+
+ return scnprintf(buf, len,
+ "%s%sport:%d status %06x %d %s%s "
+ "sig=%s%s%s%s%s%s%s%s%s%s",
+ label, label[0] ? " " : "", port, status,
+ status>>25,/*device address */
+ (status & PORT_POWER) ? " POWER" : "",
+ (status & PORT_OWNER) ? " OWNER" : "",
+ sig,
+ (status & PORT_RESET) ? " RESET" : "",
+ (status & PORT_SUSPEND) ? " SUSPEND" : "",
+ (status & PORT_RESUME) ? " RESUME" : "",
+ (status & PORT_OCC) ? " OCC" : "",
+ (status & PORT_OC) ? " OC" : "",
+ (status & PORT_PEC) ? " PEC" : "",
+ (status & PORT_PE) ? " PE" : "",
+ (status & PORT_CSC) ? " CSC" : "",
+ (status & PORT_CONNECT) ? " CONNECT" : "");
+}
+
+static void
+dbg_itd(const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd)
+{
+ ehci_dbg(ehci, "%s [%d] itd %p, next %08x, urb %p\n",
+ label, itd->frame, itd, hc32_to_cpu(ehci, itd->hw_next),
+ itd->urb);
+ ehci_dbg(ehci, " trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
+ hc32_to_cpu(ehci, itd->hw_transaction[0]),
+ hc32_to_cpu(ehci, itd->hw_transaction[1]),
+ hc32_to_cpu(ehci, itd->hw_transaction[2]),
+ hc32_to_cpu(ehci, itd->hw_transaction[3]),
+ hc32_to_cpu(ehci, itd->hw_transaction[4]),
+ hc32_to_cpu(ehci, itd->hw_transaction[5]),
+ hc32_to_cpu(ehci, itd->hw_transaction[6]),
+ hc32_to_cpu(ehci, itd->hw_transaction[7]));
+ ehci_dbg(ehci, " buf: %08x %08x %08x %08x %08x %08x %08x\n",
+ hc32_to_cpu(ehci, itd->hw_bufp[0]),
+ hc32_to_cpu(ehci, itd->hw_bufp[1]),
+ hc32_to_cpu(ehci, itd->hw_bufp[2]),
+ hc32_to_cpu(ehci, itd->hw_bufp[3]),
+ hc32_to_cpu(ehci, itd->hw_bufp[4]),
+ hc32_to_cpu(ehci, itd->hw_bufp[5]),
+ hc32_to_cpu(ehci, itd->hw_bufp[6]));
+ ehci_dbg(ehci, " index: %d %d %d %d %d %d %d %d\n",
+ itd->index[0], itd->index[1], itd->index[2],
+ itd->index[3], itd->index[4], itd->index[5],
+ itd->index[6], itd->index[7]);
+}
+#else
+static inline void __maybe_unused
+dbg_qh (char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
+{}
+
+static inline int __maybe_unused
+dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
+{ return 0; }
+
+static inline int __maybe_unused
+dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
+{ return 0; }
+
+static inline int __maybe_unused
+dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
+{ return 0; }
+
+static inline int __maybe_unused
+dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
+{ return 0; }
+
+static inline void dbg_hcs_params (struct ehci_hcd *ehci, char *label) {}
+
+static inline void dbg_hcc_params (struct ehci_hcd *ehci, char *label) {}
+
+#endif /* DEBUG */
+
+/* functions have the "wrong" filename when they're output... */
+#define dbg_status(ehci, label, status) { \
+ char _buf[80]; \
+ dbg_status_buf(_buf, sizeof(_buf), label, status); \
+ ehci_dbg(ehci, "%s\n", _buf); \
+}
+
+#define dbg_cmd(ehci, label, command) { \
+ char _buf[80]; \
+ dbg_command_buf(_buf, sizeof(_buf), label, command); \
+ ehci_dbg(ehci, "%s\n", _buf); \
+}
+
+#define dbg_port(ehci, label, port, status) { \
+ char _buf[80]; \
+ dbg_port_buf(_buf, sizeof(_buf), label, port, status); \
+ ehci_dbg(ehci, "%s\n", _buf); \
+}
+
+#ifdef STUB_DEBUG_FILES
+
+static inline void create_debug_files(struct ehci_hcd *bus) { }
+static inline void remove_debug_files(struct ehci_hcd *bus) { }
+
+#else
+
+/* troubleshooting help: expose state in debugfs */
+
+static int debug_async_open(struct inode *, struct file *);
+static int debug_periodic_open(struct inode *, struct file *);
+static int debug_registers_open(struct inode *, struct file *);
+static int debug_async_open(struct inode *, struct file *);
+static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
+static int debug_close(struct inode *, struct file *);
+
+static const struct file_operations debug_async_fops = {
+ .owner = THIS_MODULE,
+ .open = debug_async_open,
+ .read = debug_output,
+ .release = debug_close,
+ .llseek = default_llseek,
+};
+static const struct file_operations debug_periodic_fops = {
+ .owner = THIS_MODULE,
+ .open = debug_periodic_open,
+ .read = debug_output,
+ .release = debug_close,
+ .llseek = default_llseek,
+};
+static const struct file_operations debug_registers_fops = {
+ .owner = THIS_MODULE,
+ .open = debug_registers_open,
+ .read = debug_output,
+ .release = debug_close,
+ .llseek = default_llseek,
+};
+static struct dentry *ehci_debug_root;
+
+struct debug_buffer {
+ ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
+ struct usb_bus *bus;
+ struct mutex mutex; /* protect filling of buffer */
+ size_t count; /* number of characters filled into buffer */
+ char *output_buf;
+ size_t alloc_size;
+};
+
+#define speed_char(info1) ({ char tmp; \
+ switch (info1 & (3 << 12)) { \
+ case 0 << 12: \
+ tmp = 'f'; break; \
+ case 1 << 12: \
+ tmp = 'l'; break; \
+ case 2 << 12: \
+ tmp = 'h'; break; \
+ default: \
+ tmp = '?'; break; \
+ }; tmp; })
+
+static inline char token_mark(struct ehci_hcd *ehci, __hc32 token)
+{
+ __u32 v = hc32_to_cpu(ehci, token);
+
+ if (v & QTD_STS_ACTIVE)
+ return '*';
+ if (v & QTD_STS_HALT)
+ return '-';
+ if (!IS_SHORT_READ(v))
+ return ' ';
+ /* tries to advance through hw_alt_next */
+ return '/';
+}
+
+static void qh_lines(
+ struct ehci_hcd *ehci,
+ struct ehci_qh *qh,
+ char **nextp,
+ unsigned *sizep
+)
+{
+ u32 scratch;
+ u32 hw_curr;
+ struct list_head *entry;
+ struct ehci_qtd *td;
+ unsigned temp;
+ unsigned size = *sizep;
+ char *next = *nextp;
+ char mark;
+ __le32 list_end = EHCI_LIST_END(ehci);
+ struct ehci_qh_hw *hw = qh->hw;
+
+ if (hw->hw_qtd_next == list_end) /* NEC does this */
+ mark = '@';
+ else
+ mark = token_mark(ehci, hw->hw_token);
+ if (mark == '/') { /* qh_alt_next controls qh advance? */
+ if ((hw->hw_alt_next & QTD_MASK(ehci))
+ == ehci->async->hw->hw_alt_next)
+ mark = '#'; /* blocked */
+ else if (hw->hw_alt_next == list_end)
+ mark = '.'; /* use hw_qtd_next */
+ /* else alt_next points to some other qtd */
+ }
+ scratch = hc32_to_cpup(ehci, &hw->hw_info1);
+ hw_curr = (mark == '*') ? hc32_to_cpup(ehci, &hw->hw_current) : 0;
+ temp = scnprintf(next, size,
+ "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
+ qh, scratch & 0x007f,
+ speed_char(scratch),
+ (scratch >> 8) & 0x000f,
+ scratch, hc32_to_cpup(ehci, &hw->hw_info2),
+ hc32_to_cpup(ehci, &hw->hw_token), mark,
+ (cpu_to_hc32(ehci, QTD_TOGGLE) & hw->hw_token)
+ ? "data1" : "data0",
+ (hc32_to_cpup(ehci, &hw->hw_alt_next) >> 1) & 0x0f);
+ size -= temp;
+ next += temp;
+
+ /* hc may be modifying the list as we read it ... */
+ list_for_each(entry, &qh->qtd_list) {
+ td = list_entry(entry, struct ehci_qtd, qtd_list);
+ scratch = hc32_to_cpup(ehci, &td->hw_token);
+ mark = ' ';
+ if (hw_curr == td->qtd_dma)
+ mark = '*';
+ else if (hw->hw_qtd_next == cpu_to_hc32(ehci, td->qtd_dma))
+ mark = '+';
+ else if (QTD_LENGTH(scratch)) {
+ if (td->hw_alt_next == ehci->async->hw->hw_alt_next)
+ mark = '#';
+ else if (td->hw_alt_next != list_end)
+ mark = '/';
+ }
+ temp = snprintf(next, size,
+ "\n\t%p%c%s len=%d %08x urb %p",
+ td, mark, ({ char *tmp;
+ switch ((scratch>>8)&0x03) {
+ case 0:
+ tmp = "out"; break;
+ case 1:
+ tmp = "in"; break;
+ case 2:
+ tmp = "setup"; break;
+ default:
+ tmp = "?"; break;
+ } tmp; }),
+ (scratch >> 16) & 0x7fff,
+ scratch,
+ td->urb);
+ if (size < temp)
+ temp = size;
+ size -= temp;
+ next += temp;
+ if (temp == size)
+ goto done;
+ }
+
+ temp = snprintf(next, size, "\n");
+ if (size < temp)
+ temp = size;
+ size -= temp;
+ next += temp;
+
+done:
+ *sizep = size;
+ *nextp = next;
+}
+
+static ssize_t fill_async_buffer(struct debug_buffer *buf)
+{
+ struct usb_hcd *hcd;
+ struct ehci_hcd *ehci;
+ unsigned long flags;
+ unsigned temp, size;
+ char *next;
+ struct ehci_qh *qh;
+
+ hcd = bus_to_hcd(buf->bus);
+ ehci = hcd_to_ehci(hcd);
+ next = buf->output_buf;
+ size = buf->alloc_size;
+
+ *next = 0;
+
+ /* dumps a snapshot of the async schedule.
+ * usually empty except for long-term bulk reads, or head.
+ * one QH per line, and TDs we know about
+ */
+ spin_lock_irqsave(&ehci->lock, flags);
+ for (qh = ehci->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
+ qh_lines(ehci, qh, &next, &size);
+ if (ehci->reclaim && size > 0) {
+ temp = scnprintf(next, size, "\nreclaim =\n");
+ size -= temp;
+ next += temp;
+
+ for (qh = ehci->reclaim; size > 0 && qh; qh = qh->reclaim)
+ qh_lines(ehci, qh, &next, &size);
+ }
+ spin_unlock_irqrestore(&ehci->lock, flags);
+
+ return strlen(buf->output_buf);
+}
+
+#define DBG_SCHED_LIMIT 64
+static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
+{
+ struct usb_hcd *hcd;
+ struct ehci_hcd *ehci;
+ unsigned long flags;
+ union ehci_shadow p, *seen;
+ unsigned temp, size, seen_count;
+ char *next;
+ unsigned i;
+ __hc32 tag;
+
+ seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC);
+ if (!seen)
+ return 0;
+ seen_count = 0;
+
+ hcd = bus_to_hcd(buf->bus);
+ ehci = hcd_to_ehci(hcd);
+ next = buf->output_buf;
+ size = buf->alloc_size;
+
+ temp = scnprintf(next, size, "size = %d\n", ehci->periodic_size);
+ size -= temp;
+ next += temp;
+
+ /* dump a snapshot of the periodic schedule.
+ * iso changes, interrupt usually doesn't.
+ */
+ spin_lock_irqsave(&ehci->lock, flags);
+ for (i = 0; i < ehci->periodic_size; i++) {
+ p = ehci->pshadow[i];
+ if (likely(!p.ptr))
+ continue;
+ tag = Q_NEXT_TYPE(ehci, ehci->periodic[i]);
+
+ temp = scnprintf(next, size, "%4d: ", i);
+ size -= temp;
+ next += temp;
+
+ do {
+ struct ehci_qh_hw *hw;
+
+ switch (hc32_to_cpu(ehci, tag)) {
+ case Q_TYPE_QH:
+ hw = p.qh->hw;
+ temp = scnprintf(next, size, " qh%d-%04x/%p",
+ p.qh->period,
+ hc32_to_cpup(ehci,
+ &hw->hw_info2)
+ /* uframe masks */
+ & (QH_CMASK | QH_SMASK),
+ p.qh);
+ size -= temp;
+ next += temp;
+ /* don't repeat what follows this qh */
+ for (temp = 0; temp < seen_count; temp++) {
+ if (seen[temp].ptr != p.ptr)
+ continue;
+ if (p.qh->qh_next.ptr) {
+ temp = scnprintf(next, size,
+ " ...");
+ size -= temp;
+ next += temp;
+ }
+ break;
+ }
+ /* show more info the first time around */
+ if (temp == seen_count) {
+ u32 scratch = hc32_to_cpup(ehci,
+ &hw->hw_info1);
+ struct ehci_qtd *qtd;
+ char *type = "";
+
+ /* count tds, get ep direction */
+ temp = 0;
+ list_for_each_entry(qtd,
+ &p.qh->qtd_list,
+ qtd_list) {
+ temp++;
+ switch (0x03 & (hc32_to_cpu(
+ ehci,
+ qtd->hw_token) >> 8)) {
+ case 0:
+ type = "out"; continue;
+ case 1:
+ type = "in"; continue;
+ }
+ }
+
+ temp = scnprintf(next, size,
+ "(%c%d ep%d%s "
+ "[%d/%d] q%d p%d)",
+ speed_char(scratch),
+ scratch & 0x007f,
+ (scratch >> 8) & 0x000f, type,
+ p.qh->usecs, p.qh->c_usecs,
+ temp,
+ 0x7ff & (scratch >> 16));
+
+ if (seen_count < DBG_SCHED_LIMIT)
+ seen[seen_count++].qh = p.qh;
+ } else
+ temp = 0;
+ if (p.qh) {
+ tag = Q_NEXT_TYPE(ehci, hw->hw_next);
+ p = p.qh->qh_next;
+ }
+ break;
+ case Q_TYPE_FSTN:
+ temp = scnprintf(next, size,
+ " fstn-%8x/%p", p.fstn->hw_prev,
+ p.fstn);
+ tag = Q_NEXT_TYPE(ehci, p.fstn->hw_next);
+ p = p.fstn->fstn_next;
+ break;
+ case Q_TYPE_ITD:
+ temp = scnprintf(next, size,
+ " itd/%p", p.itd);
+ tag = Q_NEXT_TYPE(ehci, p.itd->hw_next);
+ p = p.itd->itd_next;
+ break;
+ case Q_TYPE_SITD:
+ temp = scnprintf(next, size,
+ " sitd%d-%04x/%p",
+ p.sitd->stream->interval,
+ hc32_to_cpup(ehci, &p.sitd->hw_uframe)
+ & 0x0000ffff,
+ p.sitd);
+ tag = Q_NEXT_TYPE(ehci, p.sitd->hw_next);
+ p = p.sitd->sitd_next;
+ break;
+ }
+ size -= temp;
+ next += temp;
+ } while (p.ptr);
+
+ temp = scnprintf(next, size, "\n");
+ size -= temp;
+ next += temp;
+ }
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ kfree(seen);
+
+ return buf->alloc_size - size;
+}
+
+#undef DBG_SCHED_LIMIT
+
+static const char *rh_state_string(struct ehci_hcd *ehci)
+{
+ switch (ehci->rh_state) {
+ case EHCI_RH_HALTED:
+ return "halted";
+ case EHCI_RH_SUSPENDED:
+ return "suspended";
+ case EHCI_RH_RUNNING:
+ return "running";
+ }
+ return "?";
+}
+
+static ssize_t fill_registers_buffer(struct debug_buffer *buf)
+{
+ struct usb_hcd *hcd;
+ struct ehci_hcd *ehci;
+ unsigned long flags;
+ unsigned temp, size, i;
+ char *next, scratch[80];
+ static const char fmt[] = "%*s\n";
+ static const char label[] = "";
+
+ hcd = bus_to_hcd(buf->bus);
+ ehci = hcd_to_ehci(hcd);
+ next = buf->output_buf;
+ size = buf->alloc_size;
+
+ spin_lock_irqsave(&ehci->lock, flags);
+
+ if (!HCD_HW_ACCESSIBLE(hcd)) {
+ size = scnprintf(next, size,
+ "bus %s, device %s\n"
+ "%s\n"
+ "SUSPENDED(no register access)\n",
+ hcd->self.controller->bus->name,
+ dev_name(hcd->self.controller),
+ hcd->product_desc);
+ goto done;
+ }
+
+ /* Capability Registers */
+ i = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
+ temp = scnprintf(next, size,
+ "bus %s, device %s\n"
+ "%s\n"
+ "EHCI %x.%02x, rh state %s\n",
+ hcd->self.controller->bus->name,
+ dev_name(hcd->self.controller),
+ hcd->product_desc,
+ i >> 8, i & 0x0ff, rh_state_string(ehci));
+ size -= temp;
+ next += temp;
+
+ /* FIXME interpret both types of params */
+ i = ehci_readl(ehci, &ehci->caps->hcs_params);
+ temp = scnprintf(next, size, "structural params 0x%08x\n", i);
+ size -= temp;
+ next += temp;
+
+ i = ehci_readl(ehci, &ehci->caps->hcc_params);
+ temp = scnprintf(next, size, "capability params 0x%08x\n", i);
+ size -= temp;
+ next += temp;
+
+ /* Operational Registers */
+ temp = dbg_status_buf(scratch, sizeof(scratch), label,
+ ehci_readl(ehci, &ehci->regs->status));
+ temp = scnprintf(next, size, fmt, temp, scratch);
+ size -= temp;
+ next += temp;
+
+ temp = dbg_command_buf(scratch, sizeof(scratch), label,
+ ehci_readl(ehci, &ehci->regs->command));
+ temp = scnprintf(next, size, fmt, temp, scratch);
+ size -= temp;
+ next += temp;
+
+ temp = dbg_intr_buf(scratch, sizeof(scratch), label,
+ ehci_readl(ehci, &ehci->regs->intr_enable));
+ temp = scnprintf(next, size, fmt, temp, scratch);
+ size -= temp;
+ next += temp;
+
+ temp = scnprintf(next, size, "uframe %04x\n",
+ ehci_read_frame_index(ehci));
+ size -= temp;
+ next += temp;
+
+ for (i = 1; i <= HCS_N_PORTS(ehci->hcs_params); i++) {
+ temp = dbg_port_buf(scratch, sizeof(scratch), label, i,
+ ehci_readl(ehci,
+ &ehci->regs->port_status[i - 1]));
+ temp = scnprintf(next, size, fmt, temp, scratch);
+ size -= temp;
+ next += temp;
+ if (i == HCS_DEBUG_PORT(ehci->hcs_params) && ehci->debug) {
+ temp = scnprintf(next, size,
+ " debug control %08x\n",
+ ehci_readl(ehci,
+ &ehci->debug->control));
+ size -= temp;
+ next += temp;
+ }
+ }
+
+ if (ehci->reclaim) {
+ temp = scnprintf(next, size, "reclaim qh %p\n", ehci->reclaim);
+ size -= temp;
+ next += temp;
+ }
+
+#ifdef EHCI_STATS
+ temp = scnprintf(next, size,
+ "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
+ ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
+ ehci->stats.lost_iaa);
+ size -= temp;
+ next += temp;
+
+ temp = scnprintf(next, size, "complete %ld unlink %ld\n",
+ ehci->stats.complete, ehci->stats.unlink);
+ size -= temp;
+ next += temp;
+#endif
+
+done:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+
+ return buf->alloc_size - size;
+}
+
+static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
+ ssize_t (*fill_func)(struct debug_buffer *))
+{
+ struct debug_buffer *buf;
+
+ buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
+
+ if (buf) {
+ buf->bus = bus;
+ buf->fill_func = fill_func;
+ mutex_init(&buf->mutex);
+ buf->alloc_size = PAGE_SIZE;
+ }
+
+ return buf;
+}
+
+static int fill_buffer(struct debug_buffer *buf)
+{
+ int ret = 0;
+
+ if (!buf->output_buf)
+ buf->output_buf = vmalloc(buf->alloc_size);
+
+ if (!buf->output_buf) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = buf->fill_func(buf);
+
+ if (ret >= 0) {
+ buf->count = ret;
+ ret = 0;
+ }
+
+out:
+ return ret;
+}
+
+static ssize_t debug_output(struct file *file, char __user *user_buf,
+ size_t len, loff_t *offset)
+{
+ struct debug_buffer *buf = file->private_data;
+ int ret = 0;
+
+ mutex_lock(&buf->mutex);
+ if (buf->count == 0) {
+ ret = fill_buffer(buf);
+ if (ret != 0) {
+ mutex_unlock(&buf->mutex);
+ goto out;
+ }
+ }
+ mutex_unlock(&buf->mutex);
+
+ ret = simple_read_from_buffer(user_buf, len, offset,
+ buf->output_buf, buf->count);
+
+out:
+ return ret;
+
+}
+
+static int debug_close(struct inode *inode, struct file *file)
+{
+ struct debug_buffer *buf = file->private_data;
+
+ if (buf) {
+ vfree(buf->output_buf);
+ kfree(buf);
+ }
+
+ return 0;
+}
+static int debug_async_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static int debug_periodic_open(struct inode *inode, struct file *file)
+{
+ struct debug_buffer *buf;
+ buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
+ if (!buf)
+ return -ENOMEM;
+
+ buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
+ file->private_data = buf;
+ return 0;
+}
+
+static int debug_registers_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private,
+ fill_registers_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static inline void create_debug_files(struct ehci_hcd *ehci)
+{
+ struct usb_bus *bus = &ehci_to_hcd(ehci)->self;
+
+ ehci->debug_dir = debugfs_create_dir(bus->bus_name, ehci_debug_root);
+ if (!ehci->debug_dir)
+ return;
+
+ if (!debugfs_create_file("async", S_IRUGO, ehci->debug_dir, bus,
+ &debug_async_fops))
+ goto file_error;
+
+ if (!debugfs_create_file("periodic", S_IRUGO, ehci->debug_dir, bus,
+ &debug_periodic_fops))
+ goto file_error;
+
+ if (!debugfs_create_file("registers", S_IRUGO, ehci->debug_dir, bus,
+ &debug_registers_fops))
+ goto file_error;
+ return;
+
+file_error:
+ debugfs_remove_recursive(ehci->debug_dir);
+}
+
+static inline void remove_debug_files(struct ehci_hcd *ehci)
+{
+ debugfs_remove_recursive(ehci->debug_dir);
+}
+
+#endif /* STUB_DEBUG_FILES */
+
+static void
+timer_action(struct ehci_hcd *ehci, enum ehci_timer_action action)
+{
+ /* Don't override timeouts which shrink or (later) disable
+ * the async ring; just the I/O watchdog. Note that if a
+ * SHRINK were pending, OFF would never be requested.
+ */
+ if (timer_pending(&ehci->watchdog)
+ && ((BIT(TIMER_ASYNC_SHRINK) | BIT(TIMER_ASYNC_OFF))
+ & ehci->actions))
+ return;
+
+ if (!test_and_set_bit(action, &ehci->actions)) {
+ unsigned long t;
+
+ switch (action) {
+ case TIMER_IO_WATCHDOG:
+ if (!ehci->need_io_watchdog)
+ return;
+ t = EHCI_IO_JIFFIES;
+ break;
+ case TIMER_ASYNC_OFF:
+ t = EHCI_ASYNC_JIFFIES;
+ break;
+ /* case TIMER_ASYNC_SHRINK: */
+ default:
+ t = EHCI_SHRINK_JIFFIES;
+ break;
+ }
+ mod_timer(&ehci->watchdog, t + jiffies);
+ }
+}
+
+/*
+ * handshake - spin reading hc until handshake completes or fails
+ * @ptr: address of hc register to be read
+ * @mask: bits to look at in result of read
+ * @done: value of those bits when handshake succeeds
+ * @usec: timeout in microseconds
+ *
+ * Returns negative errno, or zero on success
+ *
+ * Success happens when the "mask" bits have the specified value (hardware
+ * handshake done). There are two failure modes: "usec" have passed (major
+ * hardware flakeout), or the register reads as all-ones (hardware removed).
+ *
+ * That last failure should_only happen in cases like physical cardbus eject
+ * before driver shutdown. But it also seems to be caused by bugs in cardbus
+ * bridge shutdown: shutting down the bridge before the devices using it.
+ */
+static int handshake(struct ehci_hcd *ehci, void __iomem *ptr,
+ u32 mask, u32 done, int usec)
+{
+ u32 result;
+
+ do {
+ result = ehci_readl(ehci, ptr);
+ if (result == ~(u32)0) /* card removed */
+ return -ENODEV;
+ result &= mask;
+ if (result == done)
+ return 0;
+ udelay(1);
+ usec--;
+ } while (usec > 0);
+ return -ETIMEDOUT;
+}
+
+/* check TDI/ARC silicon is in host mode */
+static int tdi_in_host_mode(struct ehci_hcd *ehci)
+{
+ u32 __iomem *reg_ptr;
+ u32 tmp;
+
+ reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE);
+ tmp = ehci_readl(ehci, reg_ptr);
+ return (tmp & 3) == USBMODE_CM_HC;
+}
+
+/* force HC to halt state from unknown (EHCI spec section 2.3) */
+static int fusbh200_ehci_halt(struct ehci_hcd *ehci)
+{
+ u32 temp = ehci_readl(ehci, &ehci->regs->status);
+
+ /* disable any irqs left enabled by previous code */
+ ehci_writel(ehci, 0, &ehci->regs->intr_enable);
+
+ if (ehci_is_TDI(ehci) && tdi_in_host_mode(ehci) == 0)
+ return 0;
+
+ if ((temp & STS_HALT) != 0)
+ return 0;
+
+ temp = ehci_readl(ehci, &ehci->regs->command);
+ temp &= ~CMD_RUN;
+ ehci_writel(ehci, temp, &ehci->regs->command);
+ return handshake(ehci, &ehci->regs->status,
+ STS_HALT, STS_HALT, 16 * 125);
+}
+
+static int handshake_for_broken_root_hub(struct ehci_hcd *ehci,
+ void __iomem *ptr, u32 mask, u32 done,
+ int usec)
+{
+ return -ETIMEDOUT;
+}
+
+static int handshake_on_error_set_halt(struct ehci_hcd *ehci, void __iomem *ptr,
+ u32 mask, u32 done, int usec)
+{
+ int error;
+
+ error = handshake(ehci, ptr, mask, done, usec);
+ if (error == -ETIMEDOUT)
+ error = handshake_for_broken_root_hub(ehci, ptr, mask, done,
+ usec);
+
+ if (error) {
+ fusbh200_ehci_halt(ehci);
+ ehci->rh_state = EHCI_RH_HALTED;
+ ehci_err(ehci, "force halt; handshake %p %08x %08x -> %d\n",
+ ptr, mask, done, error);
+ }
+
+ return error;
+}
+
+/* put TDI/ARC silicon into EHCI mode */
+static void tdi_reset(struct ehci_hcd *ehci)
+{
+ u32 __iomem *reg_ptr;
+ u32 tmp;
+
+ reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE);
+ tmp = ehci_readl(ehci, reg_ptr);
+ tmp |= USBMODE_CM_HC;
+ /* The default byte access to MMR space is LE after
+ * controller reset. Set the required endian mode
+ * for transfer buffers to match the host microprocessor
+ */
+ if (ehci_big_endian_mmio(ehci))
+ tmp |= USBMODE_BE;
+ ehci_writel(ehci, tmp, reg_ptr);
+}
+
+/* reset a non-running (STS_HALT == 1) controller */
+static int ehci_reset(struct ehci_hcd *ehci)
+{
+ int retval;
+ u32 command = ehci_readl(ehci, &ehci->regs->command);
+
+ /* If the EHCI debug controller is active, special care must be
+ * taken before and after a host controller reset */
+ if (ehci->debug && !dbgp_reset_prep())
+ ehci->debug = NULL;
+
+ command |= CMD_RESET;
+ dbg_cmd(ehci, "reset", command);
+ ehci_writel(ehci, command, &ehci->regs->command);
+ ehci->rh_state = EHCI_RH_HALTED;
+ ehci->next_statechange = jiffies;
+ retval = handshake(ehci, &ehci->regs->command,
+ CMD_RESET, 0, 250 * 1000);
+
+ if (ehci->has_hostpc) {
+ ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS,
+ (u32 __iomem *)(((u8 *)ehci->regs) + USBMODE_EX));
+ ehci_writel(ehci, TXFIFO_DEFAULT,
+ (u32 __iomem *)(((u8 *)ehci->regs) + TXFILLTUNING));
+ }
+ if (retval)
+ return retval;
+
+ if (ehci_is_TDI(ehci))
+ tdi_reset(ehci);
+
+ if (ehci->debug)
+ dbgp_external_startup();
+
+ return retval;
+}
+
+/* idle the controller (from running) */
+static void ehci_quiesce(struct ehci_hcd *ehci)
+{
+ u32 temp;
+
+#ifdef DEBUG
+ if (ehci->rh_state != EHCI_RH_RUNNING)
+ BUG();
+#endif
+
+ /* wait for any schedule enables/disables to take effect */
+ temp = ehci_readl(ehci, &ehci->regs->command) << 10;
+ temp &= STS_ASS | STS_PSS;
+ if (handshake_on_error_set_halt(ehci, &ehci->regs->status,
+ STS_ASS | STS_PSS, temp, 16 * 125))
+ return;
+
+ /* then disable anything that's still active */
+ temp = ehci_readl(ehci, &ehci->regs->command);
+ temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
+ ehci_writel(ehci, temp, &ehci->regs->command);
+
+ /* hardware can take 16 microframes to turn off ... */
+ handshake_on_error_set_halt(ehci, &ehci->regs->status,
+ STS_ASS | STS_PSS, 0, 16 * 125);
+}
+
+static void end_unlink_async(struct ehci_hcd *ehci);
+static void ehci_work(struct ehci_hcd *ehci);
+
+/*
+ * EHCI Root Hub ... the nonsharable stuff
+ *
+ * Registers don't need cpu_to_le32, that happens transparently
+ */
+
+#include <linux/usb/otg.h>
+
+#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
+
+#ifdef CONFIG_PM
+
+/* After a power loss, ports that were owned by the companion must be
+ * reset so that the companion can still own them.
+ */
+static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
+{
+ u32 __iomem *reg;
+ u32 status;
+ int port;
+ __le32 buf;
+ struct usb_hcd *hcd = ehci_to_hcd(ehci);
+
+ if (!ehci->owned_ports)
+ return;
+
+ /* Give the connections some time to appear */
+ msleep(20);
+
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ if (test_bit(port, &ehci->owned_ports)) {
+ reg = &ehci->regs->port_status[port];
+ status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
+
+ /* Port already owned by companion? */
+ if (status & PORT_OWNER)
+ clear_bit(port, &ehci->owned_ports);
+ else if (test_bit(port, &ehci->companion_ports))
+ ehci_writel(ehci, status & ~PORT_PE, reg);
+ else
+ fusbh200_ehci_hub_control(hcd, SetPortFeature,
+ USB_PORT_FEAT_RESET, port + 1,
+ NULL, 0);
+ }
+ }
+
+ if (!ehci->owned_ports)
+ return;
+ msleep(90); /* Wait for resets to complete */
+
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ if (test_bit(port, &ehci->owned_ports)) {
+ fusbh200_ehci_hub_control(hcd, GetPortStatus,
+ 0, port + 1,
+ (char *) &buf, sizeof(buf));
+
+ /* The companion should now own the port,
+ * but if something went wrong the port must not
+ * remain enabled.
+ */
+ reg = &ehci->regs->port_status[port];
+ status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
+ if (status & PORT_OWNER)
+ ehci_writel(ehci, status | PORT_CSC, reg);
+ else {
+ ehci_dbg(ehci, "failed handover port %d: %x\n",
+ port + 1, status);
+ ehci_writel(ehci, status & ~PORT_PE, reg);
+ }
+ }
+ }
+
+ ehci->owned_ports = 0;
+}
+#else
+
+#define ehci_bus_suspend NULL
+#define ehci_bus_resume NULL
+
+#endif /* CONFIG_PM */
+
+/*
+ * Sets the owner of a port
+ */
+static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
+{
+ u32 __iomem *status_reg;
+ u32 port_status;
+ int try;
+
+ status_reg = &ehci->regs->port_status[portnum];
+
+ /*
+ * The controller won't set the OWNER bit if the port is
+ * enabled, so this loop will sometimes require at least two
+ * iterations: one to disable the port and one to set OWNER.
+ */
+ for (try = 4; try > 0; --try) {
+ spin_lock_irq(&ehci->lock);
+ port_status = ehci_readl(ehci, status_reg);
+ if ((port_status & PORT_OWNER) == new_owner
+ || (port_status & (PORT_OWNER | PORT_CONNECT))
+ == 0)
+ try = 0;
+ else {
+ port_status ^= PORT_OWNER;
+ port_status &= ~(PORT_PE | PORT_RWC_BITS);
+ ehci_writel(ehci, port_status, status_reg);
+ }
+ spin_unlock_irq(&ehci->lock);
+ if (try > 1)
+ msleep(5);
+ }
+}
+
+static int check_reset_complete(
+ struct ehci_hcd *ehci,
+ int index,
+ u32 __iomem *status_reg,
+ int port_status
+) {
+ if (!(port_status & PORT_CONNECT))
+ return port_status;
+
+ /* if reset finished and it's still not enabled -- handoff */
+ if (!(port_status & PORT_PE)) {
+
+ /* with integrated TT, there's nobody to hand it to! */
+ if (ehci_is_TDI(ehci)) {
+ ehci_dbg(ehci,
+ "Failed to enable port %d on root hub TT\n",
+ index+1);
+ return port_status;
+ }
+
+ ehci_dbg(ehci, "port %d full speed --> companion\n",
+ index + 1);
+
+ /* what happens if HCS_N_CC(params) == 0 ? */
+ port_status |= PORT_OWNER;
+ port_status &= ~PORT_RWC_BITS;
+ ehci_writel(ehci, port_status, status_reg);
+
+ /* ensure 440EPX ohci controller state is operational */
+ if (ehci->has_amcc_usb23)
+ set_ohci_hcfs(ehci, 1);
+ } else {
+ ehci_dbg(ehci, "port %d high speed\n", index + 1);
+ /* ensure 440EPx ohci controller state is suspended */
+ if (ehci->has_amcc_usb23)
+ set_ohci_hcfs(ehci, 0);
+ }
+
+ return port_status;
+}
+
+/*-------------------------------------------------------------------------*/
+/* build "status change" packet (one or two bytes) from HC registers */
+static int
+fusbh200_ehci_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ u32 temp, status = 0;
+ u32 mask;
+ int ports, i, retval = 1;
+ unsigned long flags;
+ u32 ppcd = 0;
+
+ /* if !USB_SUSPEND, root hub timers won't get shut down ... */
+ if (ehci->rh_state != EHCI_RH_RUNNING)
+ return 0;
+
+ /* init status to no-changes */
+ buf[0] = 0;
+ ports = HCS_N_PORTS(ehci->hcs_params);
+ if (ports > 7) {
+ buf[1] = 0;
+ retval++;
+ }
+
+ /* Some boards (mostly VIA?) report bogus overcurrent indications,
+ * causing massive log spam unless we completely ignore them. It
+ * may be relevant that VIA VT8235 controllers, where PORT_POWER is
+ * always set, seem to clear PORT_OCC and PORT_CSC when writing to
+ * PORT_POWER; that's surprising, but maybe within-spec.
+ */
+ if (!ignore_oc)
+ mask = PORT_CSC | PORT_PEC | PORT_OCC;
+ else
+ mask = PORT_CSC | PORT_PEC;
+ /* PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND */
+
+ /* no hub change reports (bit 0) for now (power, ...) */
+
+ /* port N changes (bit N)? */
+ spin_lock_irqsave(&ehci->lock, flags);
+
+ /* get per-port change detect bits */
+ if (ehci->has_ppcd)
+ ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
+
+ for (i = 0; i < ports; i++) {
+ /* leverage per-port change bits feature */
+ if (ehci->has_ppcd && !(ppcd & (1 << i)))
+ continue;
+ temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
+
+ /*
+ * Return status information even for ports with OWNER set.
+ * Otherwise khubd wouldn't see the disconnect event when a
+ * high-speed device is switched over to the companion
+ * controller by the user.
+ */
+
+ if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
+ || (ehci->reset_done[i] && time_after_eq(
+ jiffies, ehci->reset_done[i]))) {
+ if (i < 7)
+ buf[0] |= 1 << (i + 1);
+ else
+ buf[1] |= 1 << (i - 7);
+ status = STS_PCD;
+ }
+ }
+ /* FIXME autosuspend idle root hubs */
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ return status ? retval : 0;
+}
+
+static void
+fusbh200_ehci_hub_descriptor(
+ struct ehci_hcd *ehci,
+ struct usb_hub_descriptor *desc
+) {
+ int ports = HCS_N_PORTS(ehci->hcs_params);
+ u16 temp;
+
+ desc->bDescriptorType = 0x29;
+ desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
+ desc->bHubContrCurrent = 0;
+
+ desc->bNbrPorts = ports;
+ temp = 1 + (ports / 8);
+ desc->bDescLength = 7 + 2 * temp;
+
+ /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
+ memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
+ memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
+
+ temp = 0x0008; /* per-port overcurrent reporting */
+ if (HCS_PPC(ehci->hcs_params))
+ temp |= 0x0001; /* per-port power control */
+ else
+ temp |= 0x0002; /* no power switching */
+ desc->wHubCharacteristics = cpu_to_le16(temp);
+}
+
+static int fusbh200_ehci_hub_control(
+ struct usb_hcd *hcd,
+ u16 typeReq,
+ u16 wValue,
+ u16 wIndex,
+ char *buf,
+ u16 wLength
+) {
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int ports = HCS_N_PORTS(ehci->hcs_params);
+ u32 __iomem *status_reg = &ehci->regs->port_status[
+ (wIndex & 0xff) - 1];
+ u32 __iomem *hostpc_reg = NULL;
+ u32 temp, temp1, status;
+ unsigned long flags;
+ int retval = 0;
+ unsigned selector;
+
+ /*
+ * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
+ * HCS_INDICATOR may say we can change LEDs to off/amber/green.
+ * (track current state ourselves) ... blink for diagnostics,
+ * power, "this is the one", etc. EHCI spec supports this.
+ */
+
+ if (ehci->has_hostpc)
+ hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
+ + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
+ spin_lock_irqsave(&ehci->lock, flags);
+ switch (typeReq) {
+ case ClearHubFeature:
+ switch (wValue) {
+ case C_HUB_LOCAL_POWER:
+ case C_HUB_OVER_CURRENT:
+ /* no hub-wide feature/status flags */
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case ClearPortFeature:
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ temp = ehci_readl(ehci, status_reg);
+
+ /*
+ * Even if OWNER is set, so the port is owned by the
+ * companion controller, khubd needs to be able to clear
+ * the port-change status bits (especially
+ * USB_PORT_STAT_C_CONNECTION).
+ */
+
+ switch (wValue) {
+ case USB_PORT_FEAT_ENABLE:
+ ehci_writel(ehci, temp & ~PORT_PE, status_reg);
+ /* fusbh200 */
+ if (temp & PORT_RESET) {
+ u32 retval;
+
+ /* force reset to complete */
+ ehci_writel(ehci, temp &
+ ~(PORT_RWC_BITS | PORT_RESET),
+ status_reg);
+ /* REVISIT: some hardware needs 550+ usec
+ * to clear this bit; seems too long to
+ * spin routinely...
+ */
+ retval = handshake(ehci, status_reg,
+ PORT_RESET, 0, 750);
+ if (retval != 0)
+ ehci_err(ehci, "port %d reset error %d\n",
+ wIndex + 1, retval);
+ else
+ ehci_err(ehci, "PORT_RESET with C_PORT_ENABLE done\n");
+ }
+ break;
+ case USB_PORT_FEAT_C_ENABLE:
+ ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
+ status_reg);
+ break;
+ case USB_PORT_FEAT_SUSPEND:
+ if (temp & PORT_RESET)
+ goto error;
+ if (ehci->no_selective_suspend)
+ break;
+#ifdef CONFIG_USB_OTG
+ if ((hcd->self.otg_port == (wIndex + 1))
+ && hcd->self.b_hnp_enable) {
+ otg_start_hnp(ehci->transceiver);
+ break;
+ }
+#endif
+ if (!(temp & PORT_SUSPEND))
+ break;
+ if ((temp & PORT_PE) == 0)
+ goto error;
+
+ /* clear phy low-power mode before resume */
+ if (hostpc_reg) {
+ temp1 = ehci_readl(ehci, hostpc_reg);
+ ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
+ hostpc_reg);
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ msleep(5);/* wait to leave low-power mode */
+ spin_lock_irqsave(&ehci->lock, flags);
+ }
+ /* resume signaling for 20 msec */
+ temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
+ ehci_writel(ehci, temp | PORT_RESUME, status_reg);
+ ehci->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(20);
+ break;
+ case USB_PORT_FEAT_C_SUSPEND:
+ clear_bit(wIndex, &ehci->port_c_suspend);
+ break;
+ case USB_PORT_FEAT_POWER:
+ if (HCS_PPC(ehci->hcs_params))
+ ehci_writel(ehci,
+ temp & ~(PORT_RWC_BITS | PORT_POWER),
+ status_reg);
+ break;
+ case USB_PORT_FEAT_C_CONNECTION:
+ ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
+ status_reg);
+ break;
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
+ status_reg);
+ break;
+ case USB_PORT_FEAT_C_RESET:
+ /* GetPortStatus clears reset */
+ break;
+ default:
+ goto error;
+ }
+ /* unblock posted write */
+ ehci_readl(ehci, &ehci->regs->command);
+ break;
+ case GetHubDescriptor:
+ fusbh200_ehci_hub_descriptor(ehci, (struct usb_hub_descriptor *)
+ buf);
+ break;
+ case GetHubStatus:
+ /* no hub-wide feature/status flags */
+ memset(buf, 0, 4);
+ break;
+ case GetPortStatus:
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ status = 0;
+ temp = ehci_readl(ehci, status_reg);
+
+ /* wPortChange bits */
+ if (temp & PORT_CSC)
+ status |= USB_PORT_STAT_C_CONNECTION << 16;
+ if (temp & PORT_PEC)
+ status |= USB_PORT_STAT_C_ENABLE << 16;
+
+ if ((temp & PORT_OCC) && !ignore_oc) {
+ status |= USB_PORT_STAT_C_OVERCURRENT << 16;
+
+ /*
+ * Hubs should disable port power on over-current.
+ * However, not all EHCI implementations do this
+ * automatically, even if they _do_ support per-port
+ * power switching; they're allowed to just limit the
+ * current. khubd will turn the power back on.
+ */
+ if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) {
+ ehci_writel(ehci,
+ temp & ~(PORT_RWC_BITS | PORT_POWER),
+ status_reg);
+ temp = ehci_readl(ehci, status_reg);
+ }
+ }
+
+ /* whoever resumes must GetPortStatus to complete it!! */
+ if (temp & PORT_RESUME) {
+
+ /* Remote Wakeup received? */
+ if (!ehci->reset_done[wIndex]) {
+ /* resume signaling for 20 msec */
+ ehci->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(20);
+ /* check the port again */
+ mod_timer(&ehci_to_hcd(ehci)->rh_timer,
+ ehci->reset_done[wIndex]);
+ }
+
+ /* resume completed? */
+ else if (time_after_eq(jiffies,
+ ehci->reset_done[wIndex])) {
+ clear_bit(wIndex, &ehci->suspended_ports);
+ set_bit(wIndex, &ehci->port_c_suspend);
+ ehci->reset_done[wIndex] = 0;
+
+ /* stop resume signaling */
+ temp = ehci_readl(ehci, status_reg);
+ ehci_writel(ehci,
+ temp & ~(PORT_RWC_BITS | PORT_RESUME),
+ status_reg);
+ retval = handshake(ehci, status_reg,
+ PORT_RESUME, 0, 2000 /* 2msec */);
+ if (retval != 0) {
+ ehci_err(ehci,
+ "port %d resume error %d\n",
+ wIndex + 1, retval);
+ goto error;
+ }
+ temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
+ }
+ }
+
+ /* whoever resets must GetPortStatus to complete it!! */
+ if ((temp & PORT_RESET)
+ && time_after_eq(jiffies,
+ ehci->reset_done[wIndex])) {
+ status |= USB_PORT_STAT_C_RESET << 16;
+ ehci->reset_done[wIndex] = 0;
+
+ /* force reset to complete */
+ ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
+ status_reg);
+ /* REVISIT: some hardware needs 550+ usec to clear
+ * this bit; seems too long to spin routinely...
+ */
+ retval = handshake(ehci, status_reg,
+ PORT_RESET, 0, 1000);
+ if (retval != 0) {
+ ehci_err(ehci, "port %d reset error %d\n",
+ wIndex + 1, retval);
+ goto error;
+ }
+
+ /* see what we found out */
+ temp = check_reset_complete(ehci, wIndex, status_reg,
+ ehci_readl(ehci, status_reg));
+ /* fusbh200 */
+ writel(readl(&ehci->regs->command) |
+ CMD_RUN, &ehci->regs->command);
+ while ((readl(&ehci->regs->status) & STS_HALT))
+ ;
+ }
+
+ if (!(temp & (PORT_RESUME|PORT_RESET)))
+ ehci->reset_done[wIndex] = 0;
+
+ /* transfer dedicated ports to the companion hc */
+ if ((temp & PORT_CONNECT) &&
+ test_bit(wIndex, &ehci->companion_ports)) {
+ temp &= ~PORT_RWC_BITS;
+ temp |= PORT_OWNER;
+ ehci_writel(ehci, temp, status_reg);
+ ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
+ temp = ehci_readl(ehci, status_reg);
+ }
+
+ /*
+ * Even if OWNER is set, there's no harm letting khubd
+ * see the wPortStatus values (they should all be 0 except
+ * for PORT_POWER anyway).
+ */
+
+ if (temp & PORT_CONNECT) {
+ status |= USB_PORT_STAT_CONNECTION;
+ /* status may be from integrated TT */
+ if (ehci->has_hostpc) {
+ temp1 = ehci_readl(ehci, hostpc_reg);
+ status |= ehci_port_speed(ehci, temp1);
+ } else
+ status |= ehci_port_speed(ehci, temp);
+ }
+ if (temp & PORT_PE)
+ status |= USB_PORT_STAT_ENABLE;
+
+ /* maybe the port was unsuspended without our knowledge */
+ if (temp & (PORT_SUSPEND|PORT_RESUME)) {
+ status |= USB_PORT_STAT_SUSPEND;
+ } else if (test_bit(wIndex, &ehci->suspended_ports)) {
+ clear_bit(wIndex, &ehci->suspended_ports);
+ ehci->reset_done[wIndex] = 0;
+ if (temp & PORT_PE)
+ set_bit(wIndex, &ehci->port_c_suspend);
+ }
+
+ if (temp & PORT_OC)
+ status |= USB_PORT_STAT_OVERCURRENT;
+ if (temp & PORT_RESET)
+ status |= USB_PORT_STAT_RESET;
+ if (temp & PORT_POWER)
+ status |= USB_PORT_STAT_POWER;
+ if (test_bit(wIndex, &ehci->port_c_suspend))
+ status |= USB_PORT_STAT_C_SUSPEND << 16;
+
+#ifndef VERBOSE_DEBUG
+ if (status & ~0xffff) /* only if wPortChange is interesting */
+#endif
+ dbg_port(ehci, "GetStatus", wIndex + 1, temp);
+ put_unaligned_le32(status, buf);
+ break;
+ case SetHubFeature:
+ switch (wValue) {
+ case C_HUB_LOCAL_POWER:
+ case C_HUB_OVER_CURRENT:
+ /* no hub-wide feature/status flags */
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case SetPortFeature:
+ selector = wIndex >> 8;
+ wIndex &= 0xff;
+ if (unlikely(ehci->debug)) {
+ /* If the debug port is active any port
+ * feature requests should get denied */
+ if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
+ (readl(&ehci->debug->control) & DBGP_ENABLED)) {
+ retval = -ENODEV;
+ goto error_exit;
+ }
+ }
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ temp = ehci_readl(ehci, status_reg);
+ if (temp & PORT_OWNER)
+ break;
+
+ temp &= ~PORT_RWC_BITS;
+ switch (wValue) {
+ case USB_PORT_FEAT_SUSPEND:
+ if (ehci->no_selective_suspend)
+ break;
+ if ((temp & PORT_PE) == 0
+ || (temp & PORT_RESET) != 0)
+ goto error;
+
+ /* After above check the port must be connected.
+ * Set appropriate bit thus could put phy into low power
+ * mode if we have hostpc feature
+ */
+ temp &= ~PORT_WKCONN_E;
+ temp |= PORT_WKDISC_E | PORT_WKOC_E;
+ ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
+ if (hostpc_reg) {
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ msleep(5);/* 5ms for HCD enter low pwr mode */
+ spin_lock_irqsave(&ehci->lock, flags);
+ temp1 = ehci_readl(ehci, hostpc_reg);
+ ehci_writel(ehci, temp1 | HOSTPC_PHCD,
+ hostpc_reg);
+ temp1 = ehci_readl(ehci, hostpc_reg);
+ ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
+ wIndex, (temp1 & HOSTPC_PHCD) ?
+ "succeeded" : "failed");
+ }
+ set_bit(wIndex, &ehci->suspended_ports);
+ break;
+ case USB_PORT_FEAT_POWER:
+ if (HCS_PPC(ehci->hcs_params))
+ ehci_writel(ehci, temp | PORT_POWER,
+ status_reg);
+ break;
+ case USB_PORT_FEAT_RESET:
+ if (temp & PORT_RESUME)
+ goto error;
+ /* line status bits may report this as low speed,
+ * which can be fine if this root hub has a
+ * transaction translator built in.
+ */
+ if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
+ && !ehci_is_TDI(ehci)
+ && PORT_USB11(temp)) {
+ ehci_dbg(ehci,
+ "port %d low speed --> companion\n",
+ wIndex + 1);
+ temp |= PORT_OWNER;
+ } else {
+ /* fusbh200 */
+ u32 count;
+ u32 cmd = readl(&ehci->regs->command);
+
+ /* Stop controller for reset */
+ writel(cmd & (~CMD_RUN), &ehci->regs->command);
+ count = 0;
+ cmd = 0;
+ while (((cmd & STS_HALT) == 0) &&
+ (count <= 10000)) {
+ udelay(125);
+ count++;
+ cmd = readl(&ehci->regs->status);
+ }
+ if (count >= 10000) {
+ u32 regcommand, regenable;
+ u32 i, temp;
+
+ ehci_err(ehci, "Host cannot enter HALT state, recover.....\n");
+ regcommand = readl(&ehci->regs->command);
+ regenable = readl(&ehci->regs->intr_enable);
+
+ writel(CMD_RESET, &ehci->regs->command);
+ i = 0;
+ temp = CMD_RESET;
+ while (((temp & CMD_RESET)) &&
+ (i <= 100)) {
+ mdelay(60);
+ i++;
+ temp = readl(&ehci->regs->command);
+ }
+ ehci_err(ehci, "Reset OK.....%d\n", i);
+ writel(regenable, &ehci->regs->intr_enable);
+ writel(regcommand, &ehci->regs->command);
+ mdelay(1);
+ writel(regcommand | CMD_RUN, &ehci->regs->command);
+
+ ehci_err(ehci, "Host recover OK\n");
+ }
+ /* fusbh200 end */
+ ehci_vdbg(ehci, "port %d reset\n", wIndex + 1);
+ temp |= PORT_RESET;
+ temp &= ~PORT_PE;
+ /*
+ * caller must wait, then call GetPortStatus
+ * usb 2.0 spec says 50 ms resets on root
+ */
+ ehci->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(50);
+ }
+ ehci_writel(ehci, temp, status_reg);
+ break;
+
+ /* For downstream facing ports (these): one hub port is put
+ * into test mode according to USB2 11.24.2.13, then the hub
+ * must be reset (which for root hub now means rmmod+modprobe,
+ * or else system reboot). See EHCI 2.3.9 and 4.14 for info
+ * about the EHCI-specific stuff.
+ */
+ case USB_PORT_FEAT_TEST:
+ if (!selector || selector > 5)
+ goto error;
+ ehci_quiesce(ehci);
+
+ /* Put all enabled ports into suspend */
+ while (ports--) {
+ u32 __iomem *sreg =
+ &ehci->regs->port_status[ports];
+
+ temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
+ if (temp & PORT_PE)
+ ehci_writel(ehci, temp | PORT_SUSPEND,
+ sreg);
+ }
+ fusbh200_ehci_halt(ehci);
+ temp = ehci_readl(ehci, status_reg);
+ temp |= selector << 16;
+ ehci_writel(ehci, temp, status_reg);
+ break;
+
+ default:
+ goto error;
+ }
+ ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
+ break;
+
+ default:
+error:
+ /* "stall" on error */
+ retval = -EPIPE;
+ }
+error_exit:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ return retval;
+}
+
+#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
+
+/* Allocate the key transfer structures from the previously allocated pool */
+
+static inline void ehci_qtd_init(struct ehci_hcd *ehci, struct ehci_qtd *qtd,
+ dma_addr_t dma)
+{
+ memset(qtd, 0, sizeof(*qtd));
+ qtd->qtd_dma = dma;
+ qtd->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
+ qtd->hw_next = EHCI_LIST_END(ehci);
+ qtd->hw_alt_next = EHCI_LIST_END(ehci);
+ INIT_LIST_HEAD(&qtd->qtd_list);
+}
+
+static struct ehci_qtd *ehci_qtd_alloc(struct ehci_hcd *ehci, gfp_t flags)
+{
+ struct ehci_qtd *qtd;
+ dma_addr_t dma;
+
+ qtd = dma_pool_alloc(ehci->qtd_pool, flags, &dma);
+ if (qtd != NULL) {
+ ehci_qtd_init(ehci, qtd, dma);
+ }
+ return qtd;
+}
+
+static inline void ehci_qtd_free(struct ehci_hcd *ehci, struct ehci_qtd *qtd)
+{
+ dma_pool_free(ehci->qtd_pool, qtd, qtd->qtd_dma);
+}
+
+
+static void qh_destroy(struct ehci_qh *qh)
+{
+ struct ehci_hcd *ehci = qh->ehci;
+
+ /* clean qtds first, and know this is not linked */
+ if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) {
+ ehci_dbg(ehci, "unused qh not empty!\n");
+ BUG();
+ }
+ if (qh->dummy)
+ ehci_qtd_free(ehci, qh->dummy);
+ dma_pool_free(ehci->qh_pool, qh->hw, qh->qh_dma);
+ kfree(qh);
+}
+
+static struct ehci_qh *ehci_qh_alloc(struct ehci_hcd *ehci, gfp_t flags)
+{
+ struct ehci_qh *qh;
+ dma_addr_t dma;
+
+ qh = kzalloc(sizeof(*qh), GFP_ATOMIC);
+ if (!qh)
+ goto done;
+ qh->hw = (struct ehci_qh_hw *)
+ dma_pool_alloc(ehci->qh_pool, flags, &dma);
+ if (!qh->hw)
+ goto fail;
+ memset(qh->hw, 0, sizeof(*qh->hw));
+ qh->refcount = 1;
+ qh->ehci = ehci;
+ qh->qh_dma = dma;
+ INIT_LIST_HEAD(&qh->qtd_list);
+
+ /* dummy td enables safe urb queuing */
+ qh->dummy = ehci_qtd_alloc(ehci, flags);
+ if (qh->dummy == NULL) {
+ ehci_dbg(ehci, "no dummy td\n");
+ goto fail1;
+ }
+done:
+ return qh;
+fail1:
+ dma_pool_free(ehci->qh_pool, qh->hw, qh->qh_dma);
+fail:
+ kfree(qh);
+ return NULL;
+}
+
+/* to share a qh (cpu threads, or hc) */
+static inline struct ehci_qh *qh_get(struct ehci_qh *qh)
+{
+ WARN_ON(!qh->refcount);
+ qh->refcount++;
+ return qh;
+}
+
+static inline void qh_put(struct ehci_qh *qh)
+{
+ if (!--qh->refcount)
+ qh_destroy(qh);
+}
+
+/* The queue heads and transfer descriptors are managed from pools tied
+ * to each of the "per device" structures.
+ * This is the initialisation and cleanup code.
+ */
+
+static void ehci_mem_cleanup(struct ehci_hcd *ehci)
+{
+ free_cached_lists(ehci);
+ if (ehci->async)
+ qh_put(ehci->async);
+ ehci->async = NULL;
+
+ if (ehci->dummy)
+ qh_put(ehci->dummy);
+ ehci->dummy = NULL;
+
+ /* DMA consistent memory and pools */
+ if (ehci->qtd_pool)
+ dma_pool_destroy(ehci->qtd_pool);
+ ehci->qtd_pool = NULL;
+
+ if (ehci->qh_pool) {
+ dma_pool_destroy(ehci->qh_pool);
+ ehci->qh_pool = NULL;
+ }
+
+ if (ehci->itd_pool)
+ dma_pool_destroy(ehci->itd_pool);
+ ehci->itd_pool = NULL;
+
+ if (ehci->sitd_pool)
+ dma_pool_destroy(ehci->sitd_pool);
+ ehci->sitd_pool = NULL;
+
+ if (ehci->periodic)
+ dma_free_coherent(ehci_to_hcd(ehci)->self.controller,
+ ehci->periodic_size * sizeof(u32),
+ ehci->periodic, ehci->periodic_dma);
+ ehci->periodic = NULL;
+
+ /* shadow periodic table */
+ kfree(ehci->pshadow);
+ ehci->pshadow = NULL;
+}
+
+/* remember to add cleanup code (above) if you add anything here */
+static int ehci_mem_init(struct ehci_hcd *ehci, gfp_t flags)
+{
+ int i;
+
+ /* QTDs for control/bulk/intr transfers */
+ ehci->qtd_pool = dma_pool_create("ehci_qtd",
+ ehci_to_hcd(ehci)->self.controller,
+ sizeof(struct ehci_qtd),
+ 32 /* byte alignment (for hw parts) */,
+ 4096 /* can't cross 4K */);
+ if (!ehci->qtd_pool) {
+ goto fail;
+ }
+
+ /* QHs for control/bulk/intr transfers */
+ ehci->qh_pool = dma_pool_create("ehci_qh",
+ ehci_to_hcd(ehci)->self.controller,
+ sizeof(struct ehci_qh_hw),
+ 32 /* byte alignment (for hw parts) */,
+ 4096 /* can't cross 4K */);
+ if (!ehci->qh_pool) {
+ goto fail;
+ }
+ ehci->async = ehci_qh_alloc(ehci, flags);
+ if (!ehci->async) {
+ goto fail;
+ }
+
+ /* ITD for high speed ISO transfers */
+ ehci->itd_pool = dma_pool_create("ehci_itd",
+ ehci_to_hcd(ehci)->self.controller,
+ sizeof(struct ehci_itd),
+ 32 /* byte alignment (for hw parts) */,
+ 4096 /* can't cross 4K */);
+ if (!ehci->itd_pool) {
+ goto fail;
+ }
+
+ /* SITD for full/low speed split ISO transfers */
+ ehci->sitd_pool = dma_pool_create("ehci_sitd",
+ ehci_to_hcd(ehci)->self.controller,
+ sizeof(struct ehci_sitd),
+ 32 /* byte alignment (for hw parts) */,
+ 4096 /* can't cross 4K */);
+ if (!ehci->sitd_pool) {
+ goto fail;
+ }
+
+ /* Hardware periodic table */
+ ehci->periodic = (__le32 *)
+ dma_alloc_coherent(ehci_to_hcd(ehci)->self.controller,
+ ehci->periodic_size * sizeof(__le32),
+ &ehci->periodic_dma, 0);
+ if (ehci->periodic == NULL) {
+ goto fail;
+ }
+
+ if (ehci->use_dummy_qh) {
+ struct ehci_qh_hw *hw;
+ ehci->dummy = ehci_qh_alloc(ehci, flags);
+ if (!ehci->dummy)
+ goto fail;
+
+ hw = ehci->dummy->hw;
+ hw->hw_next = EHCI_LIST_END(ehci);
+ hw->hw_qtd_next = EHCI_LIST_END(ehci);
+ hw->hw_alt_next = EHCI_LIST_END(ehci);
+ hw->hw_token &= ~QTD_STS_ACTIVE;
+ ehci->dummy->hw = hw;
+
+ for (i = 0; i < ehci->periodic_size; i++)
+ ehci->periodic[i] = ehci->dummy->qh_dma;
+ } else {
+ for (i = 0; i < ehci->periodic_size; i++)
+ ehci->periodic[i] = EHCI_LIST_END(ehci);
+ }
+
+ /* software shadow of hardware table */
+ ehci->pshadow = kcalloc(ehci->periodic_size, sizeof(void *), flags);
+ if (ehci->pshadow != NULL)
+ return 0;
+
+fail:
+ ehci_dbg(ehci, "couldn't init memory\n");
+ ehci_mem_cleanup(ehci);
+ return -ENOMEM;
+}
+
+/*
+ * EHCI hardware queue manipulation ... the core. QH/QTD manipulation.
+ *
+ * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd"
+ * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned
+ * buffers needed for the larger number). We use one QH per endpoint, queue
+ * multiple urbs (all three types) per endpoint. URBs may need several qtds.
+ *
+ * ISO traffic uses "ISO TD" (itd, and sitd) records, and (along with
+ * interrupts) needs careful scheduling. Performance improvements can be
+ * an ongoing challenge. That's in "ehci-sched.c".
+ *
+ * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs,
+ * or otherwise through transaction translators (TTs) in USB 2.0 hubs using
+ * (b) special fields in qh entries or (c) split iso entries. TTs will
+ * buffer low/full speed data so the host collects it at high speed.
+ */
+
+
+/* fill a qtd, returning how much of the buffer we were able to queue up */
+static int
+qtd_fill(struct ehci_hcd *ehci, struct ehci_qtd *qtd, dma_addr_t buf,
+ size_t len, int token, int maxpacket)
+{
+ int i, count;
+ u64 addr = buf;
+
+ /* one buffer entry per 4K ... first might be short or unaligned */
+ qtd->hw_buf[0] = cpu_to_hc32(ehci, (u32)addr);
+ qtd->hw_buf_hi[0] = cpu_to_hc32(ehci, (u32)(addr >> 32));
+ count = 0x1000 - (buf & 0x0fff); /* rest of that page */
+ if (likely(len < count)) /* ... iff needed */
+ count = len;
+ else {
+ buf += 0x1000;
+ buf &= ~0x0fff;
+
+ /* per-qtd limit: from 16K to 20K (best alignment) */
+ for (i = 1; count < len && i < 5; i++) {
+ addr = buf;
+ qtd->hw_buf[i] = cpu_to_hc32(ehci, (u32)addr);
+ qtd->hw_buf_hi[i] = cpu_to_hc32(ehci,
+ (u32)(addr >> 32));
+ buf += 0x1000;
+ if ((count + 0x1000) < len)
+ count += 0x1000;
+ else
+ count = len;
+ }
+
+ /* short packets may only terminate transfers */
+ if (count != len)
+ count -= (count % maxpacket);
+ }
+ qtd->hw_token = cpu_to_hc32(ehci, (count << 16) | token);
+ qtd->length = count;
+
+ return count;
+}
+
+static inline void
+qh_update(struct ehci_hcd *ehci, struct ehci_qh *qh, struct ehci_qtd *qtd)
+{
+ struct ehci_qh_hw *hw = qh->hw;
+
+ /* writes to an active overlay are unsafe */
+ BUG_ON(qh->qh_state != QH_STATE_IDLE);
+
+ hw->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma);
+ hw->hw_alt_next = EHCI_LIST_END(ehci);
+
+ /* Except for control endpoints, we make hardware maintain data
+ * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
+ * and set the pseudo-toggle in udev. Only usb_clear_halt() will
+ * ever clear it.
+ */
+ if (!(hw->hw_info1 & cpu_to_hc32(ehci, 1 << 14))) {
+ unsigned is_out, epnum;
+
+ is_out = qh->is_out;
+ epnum = (hc32_to_cpup(ehci, &hw->hw_info1) >> 8) & 0x0f;
+ if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) {
+ hw->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE);
+ usb_settoggle(qh->dev, epnum, is_out, 1);
+ }
+ }
+
+ hw->hw_token &= cpu_to_hc32(ehci, QTD_TOGGLE | QTD_STS_PING);
+}
+
+/* if it weren't for a common silicon quirk (writing the dummy into the qh
+ * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
+ * recovery (including urb dequeue) would need software changes to a QH...
+ */
+static void
+qh_refresh(struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ struct ehci_qtd *qtd;
+
+ if (list_empty(&qh->qtd_list))
+ qtd = qh->dummy;
+ else {
+ qtd = list_entry(qh->qtd_list.next,
+ struct ehci_qtd, qtd_list);
+ /* first qtd may already be partially processed */
+ if (cpu_to_hc32(ehci, qtd->qtd_dma) == qh->hw->hw_current)
+ qtd = NULL;
+ }
+
+ if (qtd)
+ qh_update(ehci, qh, qtd);
+}
+
+static void qh_link_async(struct ehci_hcd *ehci, struct ehci_qh *qh);
+
+static void fusbh200_ehci_clear_tt_buffer_complete(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ struct ehci_qh *qh = ep->hcpriv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ehci->lock, flags);
+ qh->clearing_tt = 0;
+ if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list)
+ && ehci->rh_state == EHCI_RH_RUNNING)
+ qh_link_async(ehci, qh);
+ spin_unlock_irqrestore(&ehci->lock, flags);
+}
+
+static void ehci_clear_tt_buffer(struct ehci_hcd *ehci, struct ehci_qh *qh,
+ struct urb *urb, u32 token)
+{
+
+ /* If an async split transaction gets an error or is unlinked,
+ * the TT buffer may be left in an indeterminate state. We
+ * have to clear the TT buffer.
+ *
+ * Note: this routine is never called for Isochronous transfers.
+ */
+ if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) {
+#ifdef DEBUG
+ struct usb_device *tt = urb->dev->tt->hub;
+ dev_dbg(&tt->dev,
+ "clear tt buffer port %d, a%d ep%d t%08x\n",
+ urb->dev->ttport, urb->dev->devnum,
+ usb_pipeendpoint(urb->pipe), token);
+#endif /* DEBUG */
+ if (!ehci_is_TDI(ehci)
+ || urb->dev->tt->hub !=
+ ehci_to_hcd(ehci)->self.root_hub) {
+ if (usb_hub_clear_tt_buffer(urb) == 0)
+ qh->clearing_tt = 1;
+ } else {
+
+ /* REVISIT ARC-derived cores don't clear the root
+ * hub TT buffer in this way...
+ */
+ }
+ }
+}
+
+static int qtd_copy_status(
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ size_t length,
+ u32 token
+)
+{
+ int status = -EINPROGRESS;
+
+ /* count IN/OUT bytes, not SETUP (even short packets) */
+ if (likely(QTD_PID(token) != 2))
+ urb->actual_length += length - QTD_LENGTH(token);
+
+ /* don't modify error codes */
+ if (unlikely(urb->unlinked))
+ return status;
+
+ /* force cleanup after short read; not always an error */
+ if (unlikely(IS_SHORT_READ(token)))
+ status = -EREMOTEIO;
+
+ /* serious "can't proceed" faults reported by the hardware */
+ if (token & QTD_STS_HALT) {
+ if (token & QTD_STS_BABBLE) {
+ /* FIXME "must" disable babbling device's port too */
+ status = -EOVERFLOW;
+ /* CERR nonzero + halt --> stall */
+ } else if (QTD_CERR(token)) {
+ status = -EPIPE;
+
+ /* In theory, more than one of the following bits can be set
+ * since they are sticky and the transaction is retried.
+ * Which to test first is rather arbitrary.
+ */
+ } else if (token & QTD_STS_MMF) {
+ /* fs/ls interrupt xfer missed the complete-split */
+ status = -EPROTO;
+ } else if (token & QTD_STS_DBE) {
+ status = (QTD_PID(token) == 1) /* IN ? */
+ ? -ENOSR /* hc couldn't read data */
+ : -ECOMM; /* hc couldn't write data */
+ } else if (token & QTD_STS_XACT) {
+ /* timeout, bad CRC, wrong PID, etc */
+ ehci_dbg(ehci, "devpath %s ep%d%s 3strikes\n",
+ urb->dev->devpath,
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out");
+ status = -EPROTO;
+ } else { /* unknown */
+ status = -EPROTO;
+ }
+
+ ehci_vdbg(ehci,
+ "dev%d ep%d%s qtd token %08x --> status %d\n",
+ usb_pipedevice(urb->pipe),
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out",
+ token, status);
+ }
+
+ return status;
+}
+
+static void
+ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status)
+__releases(ehci->lock)
+__acquires(ehci->lock)
+{
+ if (likely(urb->hcpriv != NULL)) {
+ struct ehci_qh *qh = (struct ehci_qh *) urb->hcpriv;
+
+ /* S-mask in a QH means it's an interrupt urb */
+ if ((qh->hw->hw_info2 & cpu_to_hc32(ehci, QH_SMASK)) != 0) {
+
+ /* ... update hc-wide periodic stats (for usbfs) */
+ ehci_to_hcd(ehci)->self.bandwidth_int_reqs--;
+ }
+ qh_put(qh);
+ }
+
+ if (unlikely(urb->unlinked)) {
+ COUNT(ehci->stats.unlink);
+ } else {
+ /* report non-error and short read status as zero */
+ if (status == -EINPROGRESS || status == -EREMOTEIO)
+ status = 0;
+ COUNT(ehci->stats.complete);
+ }
+
+#ifdef EHCI_URB_TRACE
+ ehci_dbg(ehci,
+ "%s %s urb %p ep%d%s status %d len %d/%d\n",
+ __func__, urb->dev->devpath, urb,
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out",
+ status,
+ urb->actual_length, urb->transfer_buffer_length);
+#endif
+
+ /* complete() can reenter this HCD */
+ usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
+ spin_unlock(&ehci->lock);
+ usb_hcd_giveback_urb(ehci_to_hcd(ehci), urb, status);
+ spin_lock(&ehci->lock);
+}
+
+static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh);
+static void unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh);
+static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh);
+
+/*
+ * Process and free completed qtds for a qh, returning URBs to drivers.
+ * Chases up to qh->hw_current. Returns number of completions called,
+ * indicating how much "real" work we did.
+ */
+static unsigned
+qh_completions(struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ struct ehci_qtd *last, *end = qh->dummy;
+ struct list_head *entry, *tmp;
+ int last_status;
+ int stopped;
+ unsigned count = 0;
+ u8 state;
+ struct ehci_qh_hw *hw = qh->hw;
+
+ if (unlikely(list_empty(&qh->qtd_list)))
+ return count;
+
+ /* completions (or tasks on other cpus) must never clobber HALT
+ * till we've gone through and cleaned everything up, even when
+ * they add urbs to this qh's queue or mark them for unlinking.
+ *
+ * NOTE: unlinking expects to be done in queue order.
+ *
+ * It's a bug for qh->qh_state to be anything other than
+ * QH_STATE_IDLE, unless our caller is scan_async() or
+ * scan_periodic().
+ */
+ state = qh->qh_state;
+ qh->qh_state = QH_STATE_COMPLETING;
+ stopped = (state == QH_STATE_IDLE);
+
+ rescan:
+ last = NULL;
+ last_status = -EINPROGRESS;
+ qh->needs_rescan = 0;
+
+ /* remove de-activated QTDs from front of queue.
+ * after faults (including short reads), cleanup this urb
+ * then let the queue advance.
+ * if queue is stopped, handles unlinks.
+ */
+ list_for_each_safe(entry, tmp, &qh->qtd_list) {
+ struct ehci_qtd *qtd;
+ struct urb *urb;
+ u32 token = 0;
+
+ qtd = list_entry(entry, struct ehci_qtd, qtd_list);
+ urb = qtd->urb;
+
+ /* clean up any state from previous QTD ...*/
+ if (last) {
+ if (likely(last->urb != urb)) {
+ ehci_urb_done(ehci, last->urb, last_status);
+ count++;
+ last_status = -EINPROGRESS;
+ }
+ ehci_qtd_free(ehci, last);
+ last = NULL;
+ }
+
+ /* ignore urbs submitted during completions we reported */
+ if (qtd == end)
+ break;
+
+ /* hardware copies qtd out of qh overlay */
+ rmb();
+ token = hc32_to_cpu(ehci, qtd->hw_token);
+
+ /* always clean up qtds the hc de-activated */
+ retry_xacterr:
+ if ((token & QTD_STS_ACTIVE) == 0) {
+
+ /* Report Data Buffer Error: non-fatal but useful */
+ if (token & QTD_STS_DBE)
+ ehci_dbg(ehci,
+ "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n",
+ urb,
+ usb_endpoint_num(&urb->ep->desc),
+ usb_endpoint_dir_in(&urb->ep->desc) ? "in" : "out",
+ urb->transfer_buffer_length,
+ qtd,
+ qh);
+
+ /* on STALL, error, and short reads this urb must
+ * complete and all its qtds must be recycled.
+ */
+ if ((token & QTD_STS_HALT) != 0) {
+
+ /* retry transaction errors until we
+ * reach the software xacterr limit
+ */
+ if ((token & QTD_STS_XACT) &&
+ QTD_CERR(token) == 0 &&
+ ++qh->xacterrs < QH_XACTERR_MAX &&
+ !urb->unlinked) {
+ ehci_dbg(ehci,
+ "detected XactErr len %zu/%zu retry %d\n",
+ qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);
+
+ /* reset the token in the qtd and the
+ * qh overlay (which still contains
+ * the qtd) so that we pick up from
+ * where we left off
+ */
+ token &= ~QTD_STS_HALT;
+ token |= QTD_STS_ACTIVE |
+ (EHCI_TUNE_CERR << 10);
+ qtd->hw_token = cpu_to_hc32(ehci,
+ token);
+ wmb();
+ hw->hw_token = cpu_to_hc32(ehci,
+ token);
+ goto retry_xacterr;
+ }
+ stopped = 1;
+
+ /* magic dummy for some short reads; qh won't advance.
+ * that silicon quirk can kick in with this dummy too.
+ *
+ * other short reads won't stop the queue, including
+ * control transfers (status stage handles that) or
+ * most other single-qtd reads ... the queue stops if
+ * URB_SHORT_NOT_OK was set so the driver submitting
+ * the urbs could clean it up.
+ */
+ } else if (IS_SHORT_READ(token)
+ && !(qtd->hw_alt_next
+ & EHCI_LIST_END(ehci))) {
+ stopped = 1;
+ }
+
+ /* stop scanning when we reach qtds the hc is using */
+ } else if (likely(!stopped
+ && ehci->rh_state == EHCI_RH_RUNNING)) {
+ break;
+
+ /* scan the whole queue for unlinks whenever it stops */
+ } else {
+ stopped = 1;
+
+ /* cancel everything if we halt, suspend, etc */
+ if (ehci->rh_state != EHCI_RH_RUNNING)
+ last_status = -ESHUTDOWN;
+
+ /* this qtd is active; skip it unless a previous qtd
+ * for its urb faulted, or its urb was canceled.
+ */
+ else if (last_status == -EINPROGRESS && !urb->unlinked)
+ continue;
+
+ /* qh unlinked; token in overlay may be most current */
+ if (state == QH_STATE_IDLE
+ && cpu_to_hc32(ehci, qtd->qtd_dma)
+ == hw->hw_current) {
+ token = hc32_to_cpu(ehci, hw->hw_token);
+
+ /* An unlink may leave an incomplete
+ * async transaction in the TT buffer.
+ * We have to clear it.
+ */
+ ehci_clear_tt_buffer(ehci, qh, urb, token);
+ }
+ }
+
+ /* unless we already know the urb's status, collect qtd status
+ * and update count of bytes transferred. in common short read
+ * cases with only one data qtd (including control transfers),
+ * queue processing won't halt. but with two or more qtds (for
+ * example, with a 32 KB transfer), when the first qtd gets a
+ * short read the second must be removed by hand.
+ */
+ if (last_status == -EINPROGRESS) {
+ last_status = qtd_copy_status(ehci, urb,
+ qtd->length, token);
+ if (last_status == -EREMOTEIO
+ && (qtd->hw_alt_next
+ & EHCI_LIST_END(ehci)))
+ last_status = -EINPROGRESS;
+
+ /* As part of low/full-speed endpoint-halt processing
+ * we must clear the TT buffer (11.17.5).
+ */
+ if (unlikely(last_status != -EINPROGRESS &&
+ last_status != -EREMOTEIO)) {
+ /* The TT's in some hubs malfunction when they
+ * receive this request following a STALL (they
+ * stop sending isochronous packets). Since a
+ * STALL can't leave the TT buffer in a busy
+ * state (if you believe Figures 11-48 - 11-51
+ * in the USB 2.0 spec), we won't clear the TT
+ * buffer in this case. Strictly speaking this
+ * is a violation of the spec.
+ */
+ if (last_status != -EPIPE)
+ ehci_clear_tt_buffer(ehci, qh, urb,
+ token);
+ }
+ }
+
+ /* if we're removing something not at the queue head,
+ * patch the hardware queue pointer.
+ */
+ if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
+ last = list_entry(qtd->qtd_list.prev,
+ struct ehci_qtd, qtd_list);
+ last->hw_next = qtd->hw_next;
+ }
+
+ /* remove qtd; it's recycled after possible urb completion */
+ list_del(&qtd->qtd_list);
+ last = qtd;
+
+ /* reinit the xacterr counter for the next qtd */
+ qh->xacterrs = 0;
+ }
+
+ /* last urb's completion might still need calling */
+ if (likely(last != NULL)) {
+ ehci_urb_done(ehci, last->urb, last_status);
+ count++;
+ ehci_qtd_free(ehci, last);
+ }
+
+ /* Do we need to rescan for URBs dequeued during a giveback? */
+ if (unlikely(qh->needs_rescan)) {
+ /* If the QH is already unlinked, do the rescan now. */
+ if (state == QH_STATE_IDLE)
+ goto rescan;
+
+ /* Otherwise we have to wait until the QH is fully unlinked.
+ * Our caller will start an unlink if qh->needs_rescan is
+ * set. But if an unlink has already started, nothing needs
+ * to be done.
+ */
+ if (state != QH_STATE_LINKED)
+ qh->needs_rescan = 0;
+ }
+
+ /* restore original state; caller must unlink or relink */
+ qh->qh_state = state;
+
+ /* be sure the hardware's done with the qh before refreshing
+ * it after fault cleanup, or recovering from silicon wrongly
+ * overlaying the dummy qtd (which reduces DMA chatter).
+ */
+ if (stopped != 0 || hw->hw_qtd_next == EHCI_LIST_END(ehci)) {
+ switch (state) {
+ case QH_STATE_IDLE:
+ qh_refresh(ehci, qh);
+ break;
+ case QH_STATE_LINKED:
+ /* We won't refresh a QH that's linked (after the HC
+ * stopped the queue). That avoids a race:
+ * - HC reads first part of QH;
+ * - CPU updates that first part and the token;
+ * - HC reads rest of that QH, including token
+ * Result: HC gets an inconsistent image, and then
+ * DMAs to/from the wrong memory (corrupting it).
+ *
+ * That should be rare for interrupt transfers,
+ * except maybe high bandwidth ...
+ */
+
+ /* Tell the caller to start an unlink */
+ qh->needs_rescan = 1;
+ break;
+ /* otherwise, unlink already started */
+ }
+ }
+
+ return count;
+}
+
+/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
+#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
+/* ... and packet size, for any kind of endpoint descriptor */
+#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
+
+/*
+ * reverse of qh_urb_transaction: free a list of TDs.
+ * used for cleanup after errors, before HC sees an URB's TDs.
+ */
+static void qtd_list_free(
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ struct list_head *qtd_list
+) {
+ struct list_head *entry, *temp;
+
+ list_for_each_safe(entry, temp, qtd_list) {
+ struct ehci_qtd *qtd;
+
+ qtd = list_entry(entry, struct ehci_qtd, qtd_list);
+ list_del(&qtd->qtd_list);
+ ehci_qtd_free(ehci, qtd);
+ }
+}
+
+/*
+ * create a list of filled qtds for this URB; won't link into qh.
+ */
+static struct list_head *
+qh_urb_transaction(
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ struct list_head *head,
+ gfp_t flags
+) {
+ struct ehci_qtd *qtd, *qtd_prev;
+ dma_addr_t buf;
+ int len, this_sg_len, maxpacket;
+ int is_input;
+ u32 token;
+ int i;
+ struct scatterlist *sg;
+
+ /*
+ * URBs map to sequences of QTDs: one logical transaction
+ */
+ qtd = ehci_qtd_alloc(ehci, flags);
+ if (unlikely(!qtd))
+ return NULL;
+ list_add_tail(&qtd->qtd_list, head);
+ qtd->urb = urb;
+
+ token = QTD_STS_ACTIVE;
+ token |= (EHCI_TUNE_CERR << 10);
+ /* for split transactions, SplitXState initialized to zero */
+
+ len = urb->transfer_buffer_length;
+ is_input = usb_pipein(urb->pipe);
+ if (usb_pipecontrol(urb->pipe)) {
+ /* SETUP pid */
+ qtd_fill(ehci, qtd, urb->setup_dma,
+ sizeof(struct usb_ctrlrequest),
+ token | (2 /* "setup" */ << 8), 8);
+
+ /* ... and always at least one more pid */
+ token ^= QTD_TOGGLE;
+ qtd_prev = qtd;
+ qtd = ehci_qtd_alloc(ehci, flags);
+ if (unlikely(!qtd))
+ goto cleanup;
+ qtd->urb = urb;
+ qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma);
+ list_add_tail(&qtd->qtd_list, head);
+
+ /* for zero length DATA stages, STATUS is always IN */
+ if (len == 0)
+ token |= (1 /* "in" */ << 8);
+ }
+
+ /*
+ * data transfer stage: buffer setup
+ */
+ i = urb->num_mapped_sgs;
+ if (len > 0 && i > 0) {
+ sg = urb->sg;
+ buf = sg_dma_address(sg);
+
+ /* urb->transfer_buffer_length may be smaller than the
+ * size of the scatterlist (or vice versa)
+ */
+ this_sg_len = min_t(int, sg_dma_len(sg), len);
+ } else {
+ sg = NULL;
+ buf = urb->transfer_dma;
+ this_sg_len = len;
+ }
+
+ if (is_input)
+ token |= (1 /* "in" */ << 8);
+ /* else it's already initted to "out" pid (0 << 8) */
+
+ maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
+
+ /*
+ * buffer gets wrapped in one or more qtds;
+ * last one may be "short" (including zero len)
+ * and may serve as a control status ack
+ */
+ for (;;) {
+ int this_qtd_len;
+
+ this_qtd_len = qtd_fill(ehci, qtd, buf, this_sg_len, token,
+ maxpacket);
+ this_sg_len -= this_qtd_len;
+ len -= this_qtd_len;
+ buf += this_qtd_len;
+
+ /*
+ * short reads advance to a "magic" dummy instead of the next
+ * qtd ... that forces the queue to stop, for manual cleanup.
+ * (this will usually be overridden later.)
+ */
+ if (is_input)
+ qtd->hw_alt_next = ehci->async->hw->hw_alt_next;
+
+ /* qh makes control packets use qtd toggle; maybe switch it */
+ if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
+ token ^= QTD_TOGGLE;
+
+ if (likely(this_sg_len <= 0)) {
+ if (--i <= 0 || len <= 0)
+ break;
+ sg = sg_next(sg);
+ buf = sg_dma_address(sg);
+ this_sg_len = min_t(int, sg_dma_len(sg), len);
+ }
+
+ qtd_prev = qtd;
+ qtd = ehci_qtd_alloc(ehci, flags);
+ if (unlikely(!qtd))
+ goto cleanup;
+ qtd->urb = urb;
+ qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma);
+ list_add_tail(&qtd->qtd_list, head);
+ }
+
+ /*
+ * unless the caller requires manual cleanup after short reads,
+ * have the alt_next mechanism keep the queue running after the
+ * last data qtd (the only one, for control and most other cases).
+ */
+ if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
+ || usb_pipecontrol(urb->pipe)))
+ qtd->hw_alt_next = EHCI_LIST_END(ehci);
+
+ /*
+ * control requests may need a terminating data "status" ack;
+ * other OUT ones may need a terminating short packet
+ * (zero length).
+ */
+ if (likely(urb->transfer_buffer_length != 0)) {
+ int one_more = 0;
+
+ if (usb_pipecontrol(urb->pipe)) {
+ one_more = 1;
+ token ^= 0x0100; /* "in" <--> "out" */
+ token |= QTD_TOGGLE; /* force DATA1 */
+ } else if (usb_pipeout(urb->pipe)
+ && (urb->transfer_flags & URB_ZERO_PACKET)
+ && !(urb->transfer_buffer_length % maxpacket)) {
+ one_more = 1;
+ }
+ if (one_more) {
+ qtd_prev = qtd;
+ qtd = ehci_qtd_alloc(ehci, flags);
+ if (unlikely(!qtd))
+ goto cleanup;
+ qtd->urb = urb;
+ qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma);
+ list_add_tail(&qtd->qtd_list, head);
+
+ /* never any data in such packets */
+ qtd_fill(ehci, qtd, 0, 0, token, 0);
+ }
+ }
+
+ /* by default, enable interrupt on urb completion */
+ if (likely(!(urb->transfer_flags & URB_NO_INTERRUPT)))
+ qtd->hw_token |= cpu_to_hc32(ehci, QTD_IOC);
+ return head;
+
+cleanup:
+ qtd_list_free(ehci, urb, head);
+ return NULL;
+}
+
+/* Would be best to create all qh's from config descriptors,*/
+/* when each interface/altsetting is established. Unlink */
+/* any previous qh and cancel its urbs first; endpoints are */
+/* implicitly reset then (data toggle too). */
+/* That'd mean updating how usbcore talks to HCDs. (2.7?) */
+
+/*
+ * Each QH holds a qtd list; a QH is used for everything except iso.
+ *
+ * For interrupt urbs, the scheduler must set the microframe scheduling
+ * mask(s) each time the QH gets scheduled. For highspeed, that's
+ * just one microframe in the s-mask. For split interrupt transactions
+ * there are additional complications: c-mask, maybe FSTNs.
+ */
+static struct ehci_qh *
+qh_make(
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ gfp_t flags
+) {
+ struct ehci_qh *qh = ehci_qh_alloc(ehci, flags);
+ u32 info1 = 0, info2 = 0;
+ int is_input, type;
+ int maxp = 0;
+ struct usb_tt *tt = urb->dev->tt;
+ struct ehci_qh_hw *hw;
+
+ if (!qh)
+ return qh;
+
+ /*
+ * init endpoint/device data for this QH
+ */
+ info1 |= usb_pipeendpoint(urb->pipe) << 8;
+ info1 |= usb_pipedevice(urb->pipe) << 0;
+
+ is_input = usb_pipein(urb->pipe);
+ type = usb_pipetype(urb->pipe);
+ maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input);
+
+ /* 1024 byte maxpacket is a hardware ceiling. High bandwidth
+ * acts like up to 3KB, but is built from smaller packets.
+ */
+ if (max_packet(maxp) > 1024) {
+ ehci_dbg(ehci, "bogus qh maxpacket %d\n", max_packet(maxp));
+ goto done;
+ }
+
+ /* Compute interrupt scheduling parameters just once, and save.
+ * - allowing for high bandwidth, how many nsec/uframe are used?
+ * - split transactions need a second CSPLIT uframe; same question
+ * - splits also need a schedule gap (for full/low speed I/O)
+ * - qh has a polling interval
+ *
+ * For control/bulk requests, the HC or TT handles these.
+ */
+ if (type == PIPE_INTERRUPT) {
+ qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
+ is_input, 0,
+ hb_mult(maxp) * max_packet(maxp)));
+ qh->start = NO_FRAME;
+ qh->stamp = ehci->periodic_stamp;
+
+ if (urb->dev->speed == USB_SPEED_HIGH) {
+ qh->c_usecs = 0;
+ qh->gap_uf = 0;
+
+ qh->period = urb->interval >> 3;
+ if (qh->period == 0 && urb->interval != 1) {
+ /* NOTE interval 2 or 4 uframes could work.
+ * But interval 1 scheduling is simpler, and
+ * includes high bandwidth.
+ */
+ urb->interval = 1;
+ } else if (qh->period > ehci->periodic_size) {
+ qh->period = ehci->periodic_size;
+ urb->interval = qh->period << 3;
+ }
+ } else {
+ int think_time;
+
+ /* gap is f(FS/LS transfer times) */
+ qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed,
+ is_input, 0, maxp) / (125 * 1000);
+
+ /* FIXME this just approximates SPLIT/CSPLIT times */
+ if (is_input) { /* SPLIT, gap, CSPLIT+DATA */
+ qh->c_usecs = qh->usecs + HS_USECS(0);
+ qh->usecs = HS_USECS(1);
+ } else { /*SPLIT+DATA, gap, CSPLIT */
+ qh->usecs += HS_USECS(1);
+ qh->c_usecs = HS_USECS(0);
+ }
+
+ think_time = tt ? tt->think_time : 0;
+ qh->tt_usecs = NS_TO_US(think_time +
+ usb_calc_bus_time(urb->dev->speed,
+ is_input, 0, max_packet(maxp)));
+ qh->period = urb->interval;
+ if (qh->period > ehci->periodic_size) {
+ qh->period = ehci->periodic_size;
+ urb->interval = qh->period;
+ }
+ }
+ }
+
+ /* support for tt scheduling, and access to toggles */
+ qh->dev = urb->dev;
+
+ /* using TT? */
+ switch (urb->dev->speed) {
+ case USB_SPEED_LOW:
+ info1 |= (1 << 12); /* EPS "low" */
+ /* FALL THROUGH */
+
+ case USB_SPEED_FULL:
+ /* EPS 0 means "full" */
+ if (type != PIPE_INTERRUPT)
+ info1 |= (EHCI_TUNE_RL_TT << 28);
+ if (type == PIPE_CONTROL) {
+ info1 |= (1 << 27); /* for TT */
+ info1 |= 1 << 14; /* toggle from qtd */
+ }
+ info1 |= maxp << 16;
+
+ info2 |= (EHCI_TUNE_MULT_TT << 30);
+
+ /* Some Freescale processors have an erratum in which the
+ * port number in the queue head was 0..N-1 instead of 1..N.
+ */
+ if (ehci_has_fsl_portno_bug(ehci))
+ info2 |= (urb->dev->ttport-1) << 23;
+ else
+ info2 |= urb->dev->ttport << 23;
+
+ /* set the address of the TT; for TDI's integrated
+ * root hub tt, leave it zeroed.
+ */
+ if (tt && tt->hub != ehci_to_hcd(ehci)->self.root_hub)
+ info2 |= tt->hub->devnum << 16;
+
+ /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */
+
+ break;
+
+ case USB_SPEED_HIGH: /* no TT involved */
+ info1 |= (2 << 12); /* EPS "high" */
+ if (type == PIPE_CONTROL) {
+ info1 |= (EHCI_TUNE_RL_HS << 28);
+ info1 |= 64 << 16; /* usb2 fixed maxpacket */
+ info1 |= 1 << 14; /* toggle from qtd */
+ info2 |= (EHCI_TUNE_MULT_HS << 30);
+ } else if (type == PIPE_BULK) {
+ info1 |= (EHCI_TUNE_RL_HS << 28);
+ /* The USB spec says that high speed bulk endpoints
+ * always use 512 byte maxpacket. But some device
+ * vendors decided to ignore that, and MSFT is happy
+ * to help them do so. So now people expect to use
+ * such nonconformant devices with Linux too; sigh.
+ */
+ info1 |= max_packet(maxp) << 16;
+ info2 |= (EHCI_TUNE_MULT_HS << 30);
+ } else { /* PIPE_INTERRUPT */
+ info1 |= max_packet(maxp) << 16;
+ info2 |= hb_mult(maxp) << 30;
+ }
+ break;
+ default:
+ ehci_dbg(ehci, "bogus dev %p speed %d\n", urb->dev,
+ urb->dev->speed);
+done:
+ qh_put(qh);
+ return NULL;
+ }
+
+ /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */
+
+ /* init as live, toggle clear, advance to dummy */
+ qh->qh_state = QH_STATE_IDLE;
+ hw = qh->hw;
+ hw->hw_info1 = cpu_to_hc32(ehci, info1);
+ hw->hw_info2 = cpu_to_hc32(ehci, info2);
+ qh->is_out = !is_input;
+ usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1);
+ qh_refresh(ehci, qh);
+ return qh;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* move qh (and its qtds) onto async queue; maybe enable queue. */
+
+static void qh_link_async(struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ __hc32 dma = QH_NEXT(ehci, qh->qh_dma);
+ struct ehci_qh *head;
+
+ /* Don't link a QH if there's a Clear-TT-Buffer pending */
+ if (unlikely(qh->clearing_tt))
+ return;
+
+ WARN_ON(qh->qh_state != QH_STATE_IDLE);
+
+ /* (re)start the async schedule? */
+ head = ehci->async;
+ timer_action_done(ehci, TIMER_ASYNC_OFF);
+ if (!head->qh_next.qh) {
+ u32 cmd = ehci_readl(ehci, &ehci->regs->command);
+
+ if (!(cmd & CMD_ASE)) {
+ /* in case a clear of CMD_ASE didn't take yet */
+ (void)handshake(ehci, &ehci->regs->status,
+ STS_ASS, 0, 150);
+ cmd |= CMD_ASE;
+ ehci_writel(ehci, cmd, &ehci->regs->command);
+ /* posted write need not be known to HC yet ... */
+ }
+ }
+
+ /* clear halt and/or toggle; and maybe recover from silicon quirk */
+ qh_refresh(ehci, qh);
+
+ /* splice right after start */
+ qh->qh_next = head->qh_next;
+ qh->hw->hw_next = head->hw->hw_next;
+ wmb();
+
+ head->qh_next.qh = qh;
+ head->hw->hw_next = dma;
+
+ qh_get(qh);
+ qh->xacterrs = 0;
+ qh->qh_state = QH_STATE_LINKED;
+ /* qtd completions reported later by interrupt */
+}
+
+/*
+ * For control/bulk/interrupt, return QH with these TDs appended.
+ * Allocates and initializes the QH if necessary.
+ * Returns null if it can't allocate a QH it needs to.
+ * If the QH has TDs (urbs) already, that's great.
+ */
+static struct ehci_qh *qh_append_tds(
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ struct list_head *qtd_list,
+ int epnum,
+ void **ptr
+)
+{
+ struct ehci_qh *qh = NULL;
+ __hc32 qh_addr_mask = cpu_to_hc32(ehci, 0x7f);
+
+ qh = (struct ehci_qh *) *ptr;
+ if (unlikely(qh == NULL)) {
+ /* can't sleep here, we have ehci->lock... */
+ qh = qh_make(ehci, urb, GFP_ATOMIC);
+ *ptr = qh;
+ }
+ if (likely(qh != NULL)) {
+ struct ehci_qtd *qtd;
+
+ if (unlikely(list_empty(qtd_list)))
+ qtd = NULL;
+ else
+ qtd = list_entry(qtd_list->next, struct ehci_qtd,
+ qtd_list);
+
+ /* control qh may need patching ... */
+ if (unlikely(epnum == 0)) {
+ /* usb_reset_device() briefly reverts to address 0 */
+ if (usb_pipedevice(urb->pipe) == 0)
+ qh->hw->hw_info1 &= ~qh_addr_mask;
+ }
+
+ /* just one way to queue requests: swap with the dummy qtd.
+ * only hc or qh_refresh() ever modify the overlay.
+ */
+ if (likely(qtd != NULL)) {
+ struct ehci_qtd *dummy;
+ dma_addr_t dma;
+ __hc32 token;
+
+ /* to avoid racing the HC, use the dummy td instead of
+ * the first td of our list (becomes new dummy). both
+ * tds stay deactivated until we're done, when the
+ * HC is allowed to fetch the old dummy (4.10.2).
+ */
+ token = qtd->hw_token;
+ qtd->hw_token = HALT_BIT(ehci);
+
+ dummy = qh->dummy;
+
+ dma = dummy->qtd_dma;
+ *dummy = *qtd;
+ dummy->qtd_dma = dma;
+
+ list_del(&qtd->qtd_list);
+ list_add(&dummy->qtd_list, qtd_list);
+ list_splice_tail(qtd_list, &qh->qtd_list);
+
+ ehci_qtd_init(ehci, qtd, qtd->qtd_dma);
+ qh->dummy = qtd;
+
+ /* hc must see the new dummy at list end */
+ dma = qtd->qtd_dma;
+ qtd = list_entry(qh->qtd_list.prev,
+ struct ehci_qtd, qtd_list);
+ qtd->hw_next = QTD_NEXT(ehci, dma);
+
+ /* let the hc process these next qtds */
+ wmb();
+ dummy->hw_token = token;
+
+ urb->hcpriv = qh_get(qh);
+ }
+ }
+ return qh;
+}
+
+static int
+submit_async(
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ struct list_head *qtd_list,
+ gfp_t mem_flags
+) {
+ int epnum;
+ unsigned long flags;
+ struct ehci_qh *qh = NULL;
+ int rc;
+
+ epnum = urb->ep->desc.bEndpointAddress;
+#ifdef EHCI_URB_TRACE
+ {
+ struct ehci_qtd *qtd;
+ qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list);
+ ehci_dbg(ehci,
+ "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
+ __func__, urb->dev->devpath, urb,
+ epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
+ urb->transfer_buffer_length,
+ qtd, urb->ep->hcpriv);
+ }
+#endif
+
+ spin_lock_irqsave(&ehci->lock, flags);
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
+ rc = -ESHUTDOWN;
+ goto done;
+ }
+ rc = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
+ if (unlikely(rc))
+ goto done;
+
+ qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv);
+ if (unlikely(qh == NULL)) {
+ usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
+ rc = -ENOMEM;
+ goto done;
+ }
+
+ /* Control/bulk operations through TTs don't need scheduling,
+ * the HC and TT handle it when the TT has a buffer ready.
+ */
+ if (likely(qh->qh_state == QH_STATE_IDLE))
+ qh_link_async(ehci, qh);
+ done:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ if (unlikely(qh == NULL))
+ qtd_list_free(ehci, urb, qtd_list);
+ return rc;
+}
+
+/* the async qh for the qtds being reclaimed are now unlinked from the HC */
+
+static void end_unlink_async(struct ehci_hcd *ehci)
+{
+ struct ehci_qh *qh = ehci->reclaim;
+ struct ehci_qh *next;
+
+ /* add for fusbh200 */
+ if (qh == NULL)
+ return;
+
+ iaa_watchdog_done(ehci);
+
+ qh->qh_state = QH_STATE_IDLE;
+ qh->qh_next.qh = NULL;
+ qh_put(qh);/* refcount from reclaim */
+
+ /* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */
+ next = qh->reclaim;
+ ehci->reclaim = next;
+ qh->reclaim = NULL;
+
+ qh_completions(ehci, qh);
+
+ if (!list_empty(&qh->qtd_list) && ehci->rh_state == EHCI_RH_RUNNING) {
+ qh_link_async(ehci, qh);
+ } else {
+ /* it's not free to turn the async schedule on/off; leave it
+ * active but idle for a while once it empties.
+ */
+ if (ehci->rh_state == EHCI_RH_RUNNING
+ && ehci->async->qh_next.qh == NULL)
+ timer_action(ehci, TIMER_ASYNC_OFF);
+ }
+ qh_put(qh); /* refcount from async list */
+
+ if (next) {
+ ehci->reclaim = NULL;
+ start_unlink_async(ehci, next);
+ }
+
+ if (ehci->has_synopsys_hc_bug)
+ ehci_writel(ehci, (u32) ehci->async->qh_dma,
+ &ehci->regs->async_next);
+}
+
+/* makes sure the async qh will become idle */
+/* caller must own ehci->lock */
+static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ int cmd = ehci_readl(ehci, &ehci->regs->command);
+ struct ehci_qh *prev;
+ u32 status;
+#ifdef DEBUG
+ assert_spin_locked(&ehci->lock);
+ if (ehci->reclaim
+ || (qh->qh_state != QH_STATE_LINKED
+ && qh->qh_state != QH_STATE_UNLINK_WAIT)
+ )
+ BUG();
+#endif
+ /* add for fusbh200 */
+ status = ehci_readl(ehci, &ehci->regs->port_status[0]);
+ if ((cmd & CMD_RUN) == 0) {
+ ehci_err(ehci, "unlink qhead in HALT:..%x..%x..%x\n",
+ (u32)qh, status, cmd);
+ ehci_writel(ehci, ehci->async->qh_dma,
+ &ehci->regs->async_next);
+ }
+
+ /* stop async schedule right now? */
+ if (unlikely(qh == ehci->async)) {
+ /* can't get here without STS_ASS set */
+ if (ehci->rh_state != EHCI_RH_HALTED
+ && !ehci->reclaim) {
+ /* ... and CMD_IAAD clear */
+ ehci_writel(ehci, cmd & ~CMD_ASE,
+ &ehci->regs->command);
+ wmb();
+ /* handshake later, if we need to */
+ timer_action_done(ehci, TIMER_ASYNC_OFF);
+ }
+ return;
+ }
+
+ qh->qh_state = QH_STATE_UNLINK;
+ ehci->reclaim = qh = qh_get(qh);
+
+ prev = ehci->async;
+ while (prev->qh_next.qh != qh)
+ prev = prev->qh_next.qh;
+
+ prev->hw->hw_next = qh->hw->hw_next;
+ prev->qh_next = qh->qh_next;
+ if (ehci->qh_scan_next == qh)
+ ehci->qh_scan_next = qh->qh_next.qh;
+ wmb();
+
+ /* If the controller isn't running, we don't have to wait for it */
+ if (unlikely(ehci->rh_state != EHCI_RH_RUNNING)) {
+ /* if (unlikely (qh->reclaim != 0))
+ * this will recurse, probably not much
+ */
+ end_unlink_async(ehci);
+ return;
+ }
+
+ cmd |= CMD_IAAD;
+ ehci_writel(ehci, cmd, &ehci->regs->command);
+ (void)ehci_readl(ehci, &ehci->regs->command);
+ iaa_watchdog_start(ehci);
+}
+
+static void scan_async(struct ehci_hcd *ehci)
+{
+ bool stopped;
+ struct ehci_qh *qh;
+ enum ehci_timer_action action = TIMER_IO_WATCHDOG;
+
+ timer_action_done(ehci, TIMER_ASYNC_SHRINK);
+ stopped = (ehci->rh_state != EHCI_RH_RUNNING);
+
+ ehci->qh_scan_next = ehci->async->qh_next.qh;
+ while (ehci->qh_scan_next) {
+ qh = ehci->qh_scan_next;
+ ehci->qh_scan_next = qh->qh_next.qh;
+ rescan:
+ /* clean any finished work for this qh */
+ if (!list_empty(&qh->qtd_list)) {
+ int temp;
+
+ /*
+ * Unlinks could happen here; completion reporting
+ * drops the lock. That's why ehci->qh_scan_next
+ * always holds the next qh to scan; if the next qh
+ * gets unlinked then ehci->qh_scan_next is adjusted
+ * in start_unlink_async().
+ */
+ qh = qh_get(qh);
+ temp = qh_completions(ehci, qh);
+ if (qh->needs_rescan)
+ unlink_async(ehci, qh);
+ qh->unlink_time = jiffies + EHCI_SHRINK_JIFFIES;
+ qh_put(qh);
+ if (temp != 0)
+ goto rescan;
+ }
+
+ /* unlink idle entries, reducing DMA usage as well
+ * as HCD schedule-scanning costs. delay for any qh
+ * we just scanned, there's a not-unusual case that it
+ * doesn't stay idle for long.
+ * (plus, avoids some kind of re-activation race.)
+ */
+ if (list_empty(&qh->qtd_list)
+ && qh->qh_state == QH_STATE_LINKED) {
+ if (!ehci->reclaim && (stopped ||
+ time_after_eq(jiffies, qh->unlink_time)))
+ start_unlink_async(ehci, qh);
+ else
+ action = TIMER_ASYNC_SHRINK;
+ }
+ }
+ if (action == TIMER_ASYNC_SHRINK)
+ timer_action(ehci, TIMER_ASYNC_SHRINK);
+}
+
+/*
+ * EHCI scheduled transaction support: interrupt, iso, split iso
+ * These are called "periodic" transactions in the EHCI spec.
+ *
+ * Note that for interrupt transfers, the QH/QTD manipulation is shared
+ * with the "asynchronous" transaction support (control/bulk transfers).
+ * The only real difference is in how interrupt transfers are scheduled.
+ *
+ * For ISO, we make an "iso_stream" head to serve the same role as a QH.
+ * It keeps track of every ITD (or SITD) that's linked, and holds enough
+ * pre-calculated schedule data to make appending to the queue be quick.
+ */
+
+/*
+ * periodic_next_shadow - return "next" pointer on shadow list
+ * @periodic: host pointer to qh/itd/sitd
+ * @tag: hardware tag for type of this record
+ */
+static union ehci_shadow *
+periodic_next_shadow(struct ehci_hcd *ehci, union ehci_shadow *periodic,
+ __hc32 tag)
+{
+ switch (hc32_to_cpu(ehci, tag)) {
+ case Q_TYPE_QH:
+ return &periodic->qh->qh_next;
+ case Q_TYPE_FSTN:
+ return &periodic->fstn->fstn_next;
+ case Q_TYPE_ITD:
+ return &periodic->itd->itd_next;
+ default:
+ return &periodic->sitd->sitd_next;
+ }
+}
+
+static __hc32 *
+shadow_next_periodic(struct ehci_hcd *ehci, union ehci_shadow *periodic,
+ __hc32 tag)
+{
+ switch (hc32_to_cpu(ehci, tag)) {
+ /* our ehci_shadow.qh is actually software part */
+ case Q_TYPE_QH:
+ return &periodic->qh->hw->hw_next;
+ /* others are hw parts */
+ default:
+ return periodic->hw_next;
+ }
+}
+
+/* caller must hold ehci->lock */
+static void periodic_unlink(struct ehci_hcd *ehci, unsigned frame, void *ptr)
+{
+ union ehci_shadow *prev_p = &ehci->pshadow[frame];
+ __hc32 *hw_p = &ehci->periodic[frame];
+ union ehci_shadow here = *prev_p;
+
+ /* find predecessor of "ptr"; hw and shadow lists are in sync */
+ while (here.ptr && here.ptr != ptr) {
+ prev_p = periodic_next_shadow(ehci, prev_p,
+ Q_NEXT_TYPE(ehci, *hw_p));
+ hw_p = shadow_next_periodic(ehci, &here,
+ Q_NEXT_TYPE(ehci, *hw_p));
+ here = *prev_p;
+ }
+ /* an interrupt entry (at list end) could have been shared */
+ if (!here.ptr)
+ return;
+
+ /* update shadow and hardware lists ... the old "next" pointers
+ * from ptr may still be in use, the caller updates them.
+ */
+ *prev_p = *periodic_next_shadow(ehci, &here,
+ Q_NEXT_TYPE(ehci, *hw_p));
+
+ if (!ehci->use_dummy_qh ||
+ *shadow_next_periodic(ehci, &here, Q_NEXT_TYPE(ehci, *hw_p))
+ != EHCI_LIST_END(ehci))
+ *hw_p = *shadow_next_periodic(ehci, &here,
+ Q_NEXT_TYPE(ehci, *hw_p));
+ else
+ *hw_p = ehci->dummy->qh_dma;
+}
+
+/* how many of the uframe's 125 usecs are allocated? */
+static unsigned short
+periodic_usecs(struct ehci_hcd *ehci, unsigned frame, unsigned uframe)
+{
+ __hc32 *hw_p = &ehci->periodic[frame];
+ union ehci_shadow *q = &ehci->pshadow[frame];
+ unsigned usecs = 0;
+ struct ehci_qh_hw *hw;
+
+ while (q->ptr) {
+ switch (hc32_to_cpu(ehci, Q_NEXT_TYPE(ehci, *hw_p))) {
+ case Q_TYPE_QH:
+ hw = q->qh->hw;
+ /* is it in the S-mask? */
+ if (hw->hw_info2 & cpu_to_hc32(ehci, 1 << uframe))
+ usecs += q->qh->usecs;
+ /* ... or C-mask? */
+ if (hw->hw_info2 & cpu_to_hc32(ehci,
+ 1 << (8 + uframe)))
+ usecs += q->qh->c_usecs;
+ hw_p = &hw->hw_next;
+ q = &q->qh->qh_next;
+ break;
+ default:
+ /* for "save place" FSTNs, count the relevant INTR
+ * bandwidth from the previous frame
+ */
+ if (q->fstn->hw_prev != EHCI_LIST_END(ehci)) {
+ ehci_dbg(ehci, "ignoring FSTN cost ...\n");
+ }
+ hw_p = &q->fstn->hw_next;
+ q = &q->fstn->fstn_next;
+ break;
+ case Q_TYPE_ITD:
+ if (q->itd->hw_transaction[uframe])
+ usecs += q->itd->stream->usecs;
+ hw_p = &q->itd->hw_next;
+ q = &q->itd->itd_next;
+ break;
+ case Q_TYPE_SITD:
+ /* is it in the S-mask? (count SPLIT, DATA) */
+ if (q->sitd->hw_uframe & cpu_to_hc32(ehci,
+ 1 << uframe)) {
+ if (q->sitd->hw_fullspeed_ep &
+ cpu_to_hc32(ehci, 1<<31))
+ usecs += q->sitd->stream->usecs;
+ else /* worst case for OUT start-split */
+ usecs += HS_USECS_ISO(188);
+ }
+
+ /* ... C-mask? (count CSPLIT, DATA) */
+ if (q->sitd->hw_uframe &
+ cpu_to_hc32(ehci, 1 << (8 + uframe))) {
+ /* worst case for IN complete-split */
+ usecs += q->sitd->stream->c_usecs;
+ }
+
+ hw_p = &q->sitd->hw_next;
+ q = &q->sitd->sitd_next;
+ break;
+ }
+ }
+#ifdef DEBUG
+ if (usecs > ehci->uframe_periodic_max)
+ ehci_err(ehci, "uframe %d sched overrun: %d usecs\n",
+ frame * 8 + uframe, usecs);
+#endif
+ return usecs;
+}
+
+static int same_tt(struct usb_device *dev1, struct usb_device *dev2)
+{
+ if (!dev1->tt || !dev2->tt)
+ return 0;
+ if (dev1->tt != dev2->tt)
+ return 0;
+ if (dev1->tt->multi)
+ return dev1->ttport == dev2->ttport;
+ else
+ return 1;
+}
+
+/* return true iff the device's transaction translator is available
+ * for a periodic transfer starting at the specified frame, using
+ * all the uframes in the mask.
+ */
+static int tt_no_collision(
+ struct ehci_hcd *ehci,
+ unsigned period,
+ struct usb_device *dev,
+ unsigned frame,
+ u32 uf_mask
+)
+{
+ if (period == 0) /* error */
+ return 0;
+
+ /* note bandwidth wastage: split never follows csplit
+ * (different dev or endpoint) until the next uframe.
+ * calling convention doesn't make that distinction.
+ */
+ for (; frame < ehci->periodic_size; frame += period) {
+ union ehci_shadow here;
+ __hc32 type;
+ struct ehci_qh_hw *hw;
+
+ here = ehci->pshadow[frame];
+ type = Q_NEXT_TYPE(ehci, ehci->periodic[frame]);
+ while (here.ptr) {
+ switch (hc32_to_cpu(ehci, type)) {
+ case Q_TYPE_ITD:
+ type = Q_NEXT_TYPE(ehci, here.itd->hw_next);
+ here = here.itd->itd_next;
+ continue;
+ case Q_TYPE_QH:
+ hw = here.qh->hw;
+ if (same_tt(dev, here.qh->dev)) {
+ u32 mask;
+
+ mask = hc32_to_cpu(ehci,
+ hw->hw_info2);
+ /* "knows" no gap is needed */
+ mask |= mask >> 8;
+ if (mask & uf_mask)
+ break;
+ }
+ type = Q_NEXT_TYPE(ehci, hw->hw_next);
+ here = here.qh->qh_next;
+ continue;
+ case Q_TYPE_SITD:
+ if (same_tt(dev, here.sitd->urb->dev)) {
+ u16 mask;
+
+ mask = hc32_to_cpu(ehci, here.sitd
+ ->hw_uframe);
+ /* FIXME assumes no gap for IN! */
+ mask |= mask >> 8;
+ if (mask & uf_mask)
+ break;
+ }
+ type = Q_NEXT_TYPE(ehci, here.sitd->hw_next);
+ here = here.sitd->sitd_next;
+ continue;
+ default:
+ ehci_dbg(ehci,
+ "periodic frame %d bogus type %d\n",
+ frame, type);
+ }
+
+ /* collision or error */
+ return 0;
+ }
+ }
+
+ /* no collision */
+ return 1;
+}
+
+static int enable_periodic(struct ehci_hcd *ehci)
+{
+ u32 cmd;
+ int status;
+
+ if (ehci->periodic_sched++)
+ return 0;
+
+ /* did clearing PSE did take effect yet?
+ * takes effect only at frame boundaries...
+ */
+ status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
+ STS_PSS, 0, 9 * 125);
+ if (status) {
+ usb_hc_died(ehci_to_hcd(ehci));
+ return status;
+ }
+
+ cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE;
+ ehci_writel(ehci, cmd, &ehci->regs->command);
+ /* posted write ... PSS happens later */
+ /* make sure ehci_work scans these */
+ ehci->next_uframe = ehci_read_frame_index(ehci)
+ % (ehci->periodic_size << 3);
+ if (unlikely(ehci->broken_periodic))
+ ehci->last_periodic_enable = ktime_get_real();
+ return 0;
+}
+
+static int disable_periodic(struct ehci_hcd *ehci)
+{
+ u32 cmd;
+ int status;
+
+ if (--ehci->periodic_sched)
+ return 0;
+
+ if (unlikely(ehci->broken_periodic)) {
+ /* delay experimentally determined */
+ ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 1000);
+ ktime_t now = ktime_get_real();
+ s64 delay = ktime_us_delta(safe, now);
+
+ if (unlikely(delay > 0))
+ udelay(delay);
+ }
+
+ /* did setting PSE not take effect yet?
+ * takes effect only at frame boundaries...
+ */
+ status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
+ STS_PSS, STS_PSS, 9 * 125);
+ if (status) {
+ usb_hc_died(ehci_to_hcd(ehci));
+ return status;
+ }
+
+ cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE;
+ ehci_writel(ehci, cmd, &ehci->regs->command);
+ /* posted write ... */
+
+ free_cached_lists(ehci);
+
+ ehci->next_uframe = -1;
+ return 0;
+}
+
+/* periodic schedule slots have iso tds (normal or split) first, then a
+ * sparse tree for active interrupt transfers.
+ *
+ * this just links in a qh; caller guarantees uframe masks are set right.
+ * no FSTN support (yet; ehci 0.96+)
+ */
+static int qh_link_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ unsigned i;
+ unsigned period = qh->period;
+
+ dev_dbg(&qh->dev->dev,
+ "link qh%d-%04x/%p start %d [%d/%d us]\n",
+ period, hc32_to_cpup(ehci, &qh->hw->hw_info2)
+ & (QH_CMASK | QH_SMASK),
+ qh, qh->start, qh->usecs, qh->c_usecs);
+
+ /* high bandwidth, or otherwise every microframe */
+ if (period == 0)
+ period = 1;
+
+ for (i = qh->start; i < ehci->periodic_size; i += period) {
+ union ehci_shadow *prev = &ehci->pshadow[i];
+ __hc32 *hw_p = &ehci->periodic[i];
+ union ehci_shadow here = *prev;
+ __hc32 type = 0;
+
+ /* skip the iso nodes at list head */
+ while (here.ptr) {
+ type = Q_NEXT_TYPE(ehci, *hw_p);
+ if (type == cpu_to_hc32(ehci, Q_TYPE_QH))
+ break;
+ prev = periodic_next_shadow(ehci, prev, type);
+ hw_p = shadow_next_periodic(ehci, &here, type);
+ here = *prev;
+ }
+
+ /* sorting each branch by period (slow-->fast)
+ * enables sharing interior tree nodes
+ */
+ while (here.ptr && qh != here.qh) {
+ if (qh->period > here.qh->period)
+ break;
+ prev = &here.qh->qh_next;
+ hw_p = &here.qh->hw->hw_next;
+ here = *prev;
+ }
+ /* link in this qh, unless some earlier pass did that */
+ if (qh != here.qh) {
+ qh->qh_next = here;
+ if (here.qh)
+ qh->hw->hw_next = *hw_p;
+ wmb();
+ prev->qh = qh;
+ *hw_p = QH_NEXT(ehci, qh->qh_dma);
+ }
+ }
+ qh->qh_state = QH_STATE_LINKED;
+ qh->xacterrs = 0;
+ qh_get(qh);
+
+ /* update per-qh bandwidth for usbfs */
+ ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->period
+ ? ((qh->usecs + qh->c_usecs) / qh->period)
+ : (qh->usecs * 8);
+
+ /* maybe enable periodic schedule processing */
+ return enable_periodic(ehci);
+}
+
+static int qh_unlink_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ unsigned i;
+ unsigned period;
+
+ /* FIXME: */
+ /* IF this isn't high speed */
+ /* and this qh is active in the current uframe */
+ /* (and overlay token SplitXstate is false?) */
+ /* THEN */
+ /* qh->hw_info1 |= cpu_to_hc32(1 << 7 "ignore"); */
+
+ /* high bandwidth, or otherwise part of every microframe */
+ period = qh->period;
+ if (!period)
+ period = 1;
+
+ for (i = qh->start; i < ehci->periodic_size; i += period)
+ periodic_unlink(ehci, i, qh);
+
+ /* update per-qh bandwidth for usbfs */
+ ehci_to_hcd(ehci)->self.bandwidth_allocated -= qh->period
+ ? ((qh->usecs + qh->c_usecs) / qh->period)
+ : (qh->usecs * 8);
+
+ dev_dbg(&qh->dev->dev,
+ "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
+ qh->period,
+ hc32_to_cpup(ehci, &qh->hw->hw_info2) & (QH_CMASK | QH_SMASK),
+ qh, qh->start, qh->usecs, qh->c_usecs);
+
+ /* qh->qh_next still "live" to HC */
+ qh->qh_state = QH_STATE_UNLINK;
+ qh->qh_next.ptr = NULL;
+ qh_put(qh);
+
+ /* maybe turn off periodic schedule */
+ return disable_periodic(ehci);
+}
+
+static void intr_deschedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ unsigned wait;
+ struct ehci_qh_hw *hw = qh->hw;
+ int rc;
+
+ /* If the QH isn't linked then there's nothing we can do
+ * unless we were called during a giveback, in which case
+ * qh_completions() has to deal with it.
+ */
+ if (qh->qh_state != QH_STATE_LINKED) {
+ if (qh->qh_state == QH_STATE_COMPLETING)
+ qh->needs_rescan = 1;
+ return;
+ }
+
+ qh_unlink_periodic(ehci, qh);
+
+ /* simple/paranoid: always delay, expecting the HC needs to read
+ * qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and
+ * expect khubd to clean up after any CSPLITs we won't issue.
+ * active high speed queues may need bigger delays...
+ */
+ if (list_empty(&qh->qtd_list)
+ || (cpu_to_hc32(ehci, QH_CMASK)
+ & hw->hw_info2) != 0)
+ wait = 2;
+ else
+ wait = 55; /* worst case: 3 * 1024 */
+
+ udelay(wait);
+ qh->qh_state = QH_STATE_IDLE;
+ hw->hw_next = EHCI_LIST_END(ehci);
+ wmb();
+
+ qh_completions(ehci, qh);
+
+ /* reschedule QH iff another request is queued */
+ if (!list_empty(&qh->qtd_list) &&
+ ehci->rh_state == EHCI_RH_RUNNING) {
+ rc = qh_schedule(ehci, qh);
+
+ /* An error here likely indicates handshake failure
+ * or no space left in the schedule. Neither fault
+ * should happen often ...
+ *
+ * FIXME kill the now-dysfunctional queued urbs
+ */
+ if (rc != 0)
+ ehci_err(ehci, "can't reschedule qh %p, err %d\n",
+ qh, rc);
+ }
+}
+
+static int check_period(
+ struct ehci_hcd *ehci,
+ unsigned frame,
+ unsigned uframe,
+ unsigned period,
+ unsigned usecs
+) {
+ int claimed;
+
+ /* complete split running into next frame?
+ * given FSTN support, we could sometimes check...
+ */
+ if (uframe >= 8)
+ return 0;
+
+ /* convert "usecs we need" to "max already claimed" */
+ usecs = ehci->uframe_periodic_max - usecs;
+
+ /* we "know" 2 and 4 uframe intervals were rejected; so
+ * for period 0, check _every_ microframe in the schedule.
+ */
+ if (unlikely(period == 0)) {
+ do {
+ for (uframe = 0; uframe < 7; uframe++) {
+ claimed = periodic_usecs(ehci, frame, uframe);
+ if (claimed > usecs)
+ return 0;
+ }
+ } while ((frame += 1) < ehci->periodic_size);
+
+ /* just check the specified uframe, at that period */
+ } else {
+ do {
+ claimed = periodic_usecs(ehci, frame, uframe);
+ if (claimed > usecs)
+ return 0;
+ } while ((frame += period) < ehci->periodic_size);
+ }
+
+ /* success! */
+ return 1;
+}
+
+static int check_intr_schedule(
+ struct ehci_hcd *ehci,
+ unsigned frame,
+ unsigned uframe,
+ const struct ehci_qh *qh,
+ __hc32 *c_maskp
+)
+{
+ int retval = -ENOSPC;
+ u8 mask = 0;
+
+ if (qh->c_usecs && uframe >= 6) /* FSTN territory? */
+ goto done;
+
+ if (!check_period(ehci, frame, uframe, qh->period, qh->usecs))
+ goto done;
+ if (!qh->c_usecs) {
+ retval = 0;
+ *c_maskp = 0;
+ goto done;
+ }
+
+ /* Make sure this tt's buffer is also available for CSPLITs.
+ * We pessimize a bit; probably the typical full speed case
+ * doesn't need the second CSPLIT.
+ *
+ * NOTE: both SPLIT and CSPLIT could be checked in just
+ * one smart pass...
+ */
+ mask = 0x03 << (uframe + qh->gap_uf);
+ *c_maskp = cpu_to_hc32(ehci, mask << 8);
+
+ mask |= 1 << uframe;
+ if (tt_no_collision(ehci, qh->period, qh->dev, frame, mask)) {
+ if (!check_period(ehci, frame, uframe + qh->gap_uf + 1,
+ qh->period, qh->c_usecs))
+ goto done;
+ if (!check_period(ehci, frame, uframe + qh->gap_uf,
+ qh->period, qh->c_usecs))
+ goto done;
+ retval = 0;
+ }
+done:
+ return retval;
+}
+
+/* "first fit" scheduling policy used the first time through,
+ * or when the previous schedule slot can't be re-used.
+ */
+static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ int status;
+ unsigned uframe;
+ __hc32 c_mask;
+ unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */
+ struct ehci_qh_hw *hw = qh->hw;
+
+ qh_refresh(ehci, qh);
+ hw->hw_next = EHCI_LIST_END(ehci);
+ frame = qh->start;
+
+ /* reuse the previous schedule slots, if we can */
+ if (frame < qh->period) {
+ uframe = ffs(hc32_to_cpup(ehci, &hw->hw_info2) & QH_SMASK);
+ status = check_intr_schedule(ehci, frame, --uframe,
+ qh, &c_mask);
+ } else {
+ uframe = 0;
+ c_mask = 0;
+ status = -ENOSPC;
+ }
+
+ /* else scan the schedule to find a group of slots such that all
+ * uframes have enough periodic bandwidth available.
+ */
+ if (status) {
+ /* "normal" case, uframing flexible except with splits */
+ if (qh->period) {
+ int i;
+
+ for (i = qh->period; status && i > 0; --i) {
+ frame = ++ehci->random_frame % qh->period;
+ for (uframe = 0; uframe < 8; uframe++) {
+ status = check_intr_schedule(ehci,
+ frame, uframe, qh,
+ &c_mask);
+ if (status == 0)
+ break;
+ }
+ }
+
+ /* qh->period == 0 means every uframe */
+ } else {
+ frame = 0;
+ status = check_intr_schedule(ehci, 0, 0, qh, &c_mask);
+ }
+ if (status)
+ goto done;
+ qh->start = frame;
+
+ /* reset S-frame and (maybe) C-frame masks */
+ hw->hw_info2 &= cpu_to_hc32(ehci, ~(QH_CMASK | QH_SMASK));
+ hw->hw_info2 |= qh->period
+ ? cpu_to_hc32(ehci, 1 << uframe)
+ : cpu_to_hc32(ehci, QH_SMASK);
+ hw->hw_info2 |= c_mask;
+ } else
+ ehci_dbg(ehci, "reused qh %p schedule\n", qh);
+
+ /* stuff into the periodic schedule */
+ status = qh_link_periodic(ehci, qh);
+done:
+ return status;
+}
+
+static int intr_submit(
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ struct list_head *qtd_list,
+ gfp_t mem_flags
+) {
+ unsigned epnum;
+ unsigned long flags;
+ struct ehci_qh *qh;
+ int status;
+ struct list_head empty;
+
+ /* get endpoint and transfer/schedule data */
+ epnum = urb->ep->desc.bEndpointAddress;
+
+ spin_lock_irqsave(&ehci->lock, flags);
+
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
+ status = -ESHUTDOWN;
+ goto done_not_linked;
+ }
+ status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
+ if (unlikely(status))
+ goto done_not_linked;
+
+ /* get qh and force any scheduling errors */
+ INIT_LIST_HEAD(&empty);
+ qh = qh_append_tds(ehci, urb, &empty, epnum, &urb->ep->hcpriv);
+ if (qh == NULL) {
+ status = -ENOMEM;
+ goto done;
+ }
+ if (qh->qh_state == QH_STATE_IDLE) {
+ status = qh_schedule(ehci, qh);
+ if (status != 0)
+ goto done;
+ }
+
+ /* then queue the urb's tds to the qh */
+ qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv);
+ BUG_ON(qh == NULL);
+
+ /* ... update usbfs periodic stats */
+ ehci_to_hcd(ehci)->self.bandwidth_int_reqs++;
+
+done:
+ if (unlikely(status))
+ usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
+done_not_linked:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ if (status)
+ qtd_list_free(ehci, urb, qtd_list);
+
+ return status;
+}
+
+/* ehci_iso_stream ops work with both ITD and SITD */
+
+static struct ehci_iso_stream *
+iso_stream_alloc(gfp_t mem_flags)
+{
+ struct ehci_iso_stream *stream;
+
+ stream = kzalloc(sizeof(*stream), mem_flags);
+ if (likely(stream != NULL)) {
+ INIT_LIST_HEAD(&stream->td_list);
+ INIT_LIST_HEAD(&stream->free_list);
+ stream->next_uframe = -1;
+ stream->refcount = 1;
+ }
+ return stream;
+}
+
+static void
+iso_stream_init(
+ struct ehci_hcd *ehci,
+ struct ehci_iso_stream *stream,
+ struct usb_device *dev,
+ int pipe,
+ unsigned interval
+)
+{
+ static const u8 smask_out[] = { 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f };
+
+ u32 buf1;
+ unsigned epnum, maxp;
+ int is_input;
+ long bandwidth;
+ u32 ehci_speed;
+
+ /*
+ * this might be a "high bandwidth" highspeed endpoint,
+ * as encoded in the ep descriptor's wMaxPacket field
+ */
+ epnum = usb_pipeendpoint(pipe);
+ is_input = usb_pipein(pipe) ? USB_DIR_IN : 0;
+ maxp = usb_maxpacket(dev, pipe, !is_input);
+ if (is_input) {
+ buf1 = (1 << 11);
+ } else {
+ buf1 = 0;
+ }
+ /* add for fusbh200 */
+ ehci_speed = ehci_port_speed(ehci, 0);
+ if (ehci_is_TDI(ehci)) {
+ /* we use 125us as unit */
+ if (ehci_speed != USB_PORT_STAT_HIGH_SPEED)
+ interval = interval << 3;
+ }
+ if ((dev->speed == USB_SPEED_HIGH) ||
+ ((ehci_is_TDI(ehci)) &&
+ (ehci_speed != USB_PORT_STAT_HIGH_SPEED))) {
+ unsigned multi = hb_mult(maxp);
+
+ /* knows about ITD vs SITD */
+ if (dev->speed == USB_SPEED_HIGH)
+ stream->highspeed = 1;
+
+ maxp = max_packet(maxp);
+ buf1 |= maxp;
+ maxp *= multi;
+
+ stream->buf0 = cpu_to_hc32(ehci, (epnum << 8) | dev->devnum);
+ stream->buf1 = cpu_to_hc32(ehci, buf1);
+ stream->buf2 = cpu_to_hc32(ehci, multi);
+
+ /* usbfs wants to report the average usecs per frame tied up
+ * when transfers on this endpoint are scheduled ...
+ */
+ if (ehci_speed != USB_PORT_STAT_HIGH_SPEED) {/*full speed */
+ stream->usecs =
+ NS_TO_US(usb_calc_bus_time(dev->speed, is_input, 1, maxp));
+ /* convert from FS to HS, use 125us as unit */
+ stream->usecs /= 8;
+ } else
+ stream->usecs = HS_USECS_ISO(maxp);
+
+ bandwidth = stream->usecs * 8;
+ bandwidth /= interval;
+
+ } else {
+ u32 addr;
+ int think_time;
+ int hs_transfers;
+
+ addr = dev->ttport << 24;
+ if (!ehci_is_TDI(ehci)
+ || (dev->tt->hub !=
+ ehci_to_hcd(ehci)->self.root_hub))
+ addr |= dev->tt->hub->devnum << 16;
+ addr |= epnum << 8;
+ addr |= dev->devnum;
+ stream->usecs = HS_USECS_ISO(maxp);
+ think_time = dev->tt ? dev->tt->think_time : 0;
+ stream->tt_usecs = NS_TO_US(think_time + usb_calc_bus_time(
+ dev->speed, is_input, 1, maxp));
+ hs_transfers = max(1u, (maxp + 187) / 188);
+ if (is_input) {
+ u32 tmp;
+
+ addr |= 1 << 31;
+ stream->c_usecs = stream->usecs;
+ stream->usecs = HS_USECS_ISO(1);
+ stream->raw_mask = 1;
+
+ /* c-mask as specified in USB 2.0 11.18.4 3.c */
+ tmp = (1 << (hs_transfers + 2)) - 1;
+ stream->raw_mask |= tmp << (8 + 2);
+ } else
+ stream->raw_mask = smask_out[hs_transfers - 1];
+ bandwidth = stream->usecs + stream->c_usecs;
+ bandwidth /= interval << 3;
+
+ /* stream->splits gets created from raw_mask later */
+ stream->address = cpu_to_hc32(ehci, addr);
+ }
+ stream->bandwidth = bandwidth;
+
+ stream->udev = dev;
+
+ stream->bEndpointAddress = is_input | epnum;
+ stream->interval = interval;
+ stream->maxp = maxp;
+}
+
+static void
+iso_stream_put(struct ehci_hcd *ehci, struct ehci_iso_stream *stream)
+{
+ u32 ehci_speed = ehci_port_speed(ehci, 0);
+
+ stream->refcount--;
+
+ /* free whenever just a dev->ep reference remains.
+ * not like a QH -- no persistent state (toggle, halt)
+ */
+ if (stream->refcount == 1) {
+ while (!list_empty(&stream->free_list)) {
+ struct list_head *entry;
+
+ entry = stream->free_list.next;
+ list_del(entry);
+
+ /* knows about ITD vs SITD */
+ if ((stream->highspeed) || ((ehci_is_TDI(ehci)) &&
+ (ehci_speed != USB_PORT_STAT_HIGH_SPEED))) {
+ struct ehci_itd *itd;
+
+ itd = list_entry(entry, struct ehci_itd,
+ itd_list);
+ dma_pool_free(ehci->itd_pool, itd,
+ itd->itd_dma);
+ } else {
+ struct ehci_sitd *sitd;
+
+ sitd = list_entry(entry, struct ehci_sitd,
+ sitd_list);
+ dma_pool_free(ehci->sitd_pool, sitd,
+ sitd->sitd_dma);
+ }
+ }
+
+ stream->bEndpointAddress &= 0x0f;
+ if (stream->ep)
+ stream->ep->hcpriv = NULL;
+
+ kfree(stream);
+ }
+}
+
+static inline struct ehci_iso_stream *
+iso_stream_get(struct ehci_iso_stream *stream)
+{
+ if (likely(stream != NULL))
+ stream->refcount++;
+ return stream;
+}
+
+static struct ehci_iso_stream *
+iso_stream_find(struct ehci_hcd *ehci, struct urb *urb)
+{
+ unsigned epnum;
+ struct ehci_iso_stream *stream;
+ struct usb_host_endpoint *ep;
+ unsigned long flags;
+
+ epnum = usb_pipeendpoint(urb->pipe);
+ if (usb_pipein(urb->pipe))
+ ep = urb->dev->ep_in[epnum];
+ else
+ ep = urb->dev->ep_out[epnum];
+
+ spin_lock_irqsave(&ehci->lock, flags);
+ stream = ep->hcpriv;
+
+ if (unlikely(stream == NULL)) {
+ stream = iso_stream_alloc(GFP_ATOMIC);
+ if (likely(stream != NULL)) {
+ /* dev->ep owns the initial refcount */
+ ep->hcpriv = stream;
+ stream->ep = ep;
+ iso_stream_init(ehci, stream, urb->dev, urb->pipe,
+ urb->interval);
+ }
+
+ /* if dev->ep[epnum] is a QH, hw is set */
+ } else if (unlikely(stream->hw != NULL)) {
+ ehci_dbg(ehci, "dev %s ep%d%s, not iso??\n",
+ urb->dev->devpath, epnum,
+ usb_pipein(urb->pipe) ? "in" : "out");
+ stream = NULL;
+ }
+ /* caller guarantees an eventual matching iso_stream_put */
+ stream = iso_stream_get(stream);
+
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ return stream;
+}
+
+/* ehci_iso_sched ops can be ITD-only or SITD-only */
+
+static struct ehci_iso_sched *
+iso_sched_alloc(unsigned packets, gfp_t mem_flags)
+{
+ struct ehci_iso_sched *iso_sched;
+ int size = sizeof(*iso_sched);
+
+ size += packets * sizeof(struct ehci_iso_packet);
+ iso_sched = kzalloc(size, mem_flags);
+ if (likely(iso_sched != NULL)) {
+ INIT_LIST_HEAD(&iso_sched->td_list);
+ }
+ return iso_sched;
+}
+
+static inline void
+itd_sched_init(
+ struct ehci_hcd *ehci,
+ struct ehci_iso_sched *iso_sched,
+ struct ehci_iso_stream *stream,
+ struct urb *urb
+)
+{
+ unsigned i;
+ dma_addr_t dma = urb->transfer_dma;
+
+ /* how many uframes are needed for these transfers */
+ iso_sched->span = urb->number_of_packets * stream->interval;
+
+ /* figure out per-uframe itd fields that we'll need later
+ * when we fit new itds into the schedule.
+ */
+ for (i = 0; i < urb->number_of_packets; i++) {
+ struct ehci_iso_packet *uframe = &iso_sched->packet[i];
+ unsigned length;
+ dma_addr_t buf;
+ u32 trans;
+
+ length = urb->iso_frame_desc[i].length;
+ buf = dma + urb->iso_frame_desc[i].offset;
+
+ trans = EHCI_ISOC_ACTIVE;
+ trans |= buf & 0x0fff;
+ if (unlikely(((i + 1) == urb->number_of_packets))
+ && !(urb->transfer_flags & URB_NO_INTERRUPT))
+ trans |= EHCI_ITD_IOC;
+ trans |= length << 16;
+ uframe->transaction = cpu_to_hc32(ehci, trans);
+
+ /* might need to cross a buffer page within a uframe */
+ uframe->bufp = (buf & ~(u64)0x0fff);
+ buf += length;
+ if (unlikely((uframe->bufp != (buf & ~(u64)0x0fff))))
+ uframe->cross = 1;
+ }
+}
+
+static void
+iso_sched_free(
+ struct ehci_iso_stream *stream,
+ struct ehci_iso_sched *iso_sched
+)
+{
+ if (!iso_sched)
+ return;
+ /* caller must hold ehci->lock! */
+ list_splice(&iso_sched->td_list, &stream->free_list);
+ kfree(iso_sched);
+}
+
+static int
+itd_urb_transaction(
+ struct ehci_iso_stream *stream,
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ gfp_t mem_flags
+)
+{
+ struct ehci_itd *itd;
+ dma_addr_t itd_dma;
+ int i;
+ unsigned num_itds;
+ struct ehci_iso_sched *sched;
+ unsigned long flags;
+
+ sched = iso_sched_alloc(urb->number_of_packets, mem_flags);
+ if (unlikely(sched == NULL))
+ return -ENOMEM;
+
+ itd_sched_init(ehci, sched, stream, urb);
+
+ if (urb->interval < 8)
+ num_itds = 1 + (sched->span + 7) / 8;
+ else
+ num_itds = urb->number_of_packets;
+ /* allocate/init ITDs */
+ spin_lock_irqsave(&ehci->lock, flags);
+ for (i = 0; i < num_itds; i++) {
+
+ /* free_list.next might be cache-hot ... but maybe
+ * the HC caches it too. avoid that issue for now.
+ */
+
+ /* prefer previously-allocated itds */
+ if (likely(!list_empty(&stream->free_list))) {
+ itd = list_entry(stream->free_list.prev,
+ struct ehci_itd, itd_list);
+ list_del(&itd->itd_list);
+ itd_dma = itd->itd_dma;
+ } else {
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ itd = dma_pool_alloc(ehci->itd_pool, mem_flags,
+ &itd_dma);
+ spin_lock_irqsave(&ehci->lock, flags);
+ if (!itd) {
+ iso_sched_free(stream, sched);
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ return -ENOMEM;
+ }
+ }
+ memset(itd, 0, sizeof(*itd));
+ itd->itd_dma = itd_dma;
+ list_add(&itd->itd_list, &sched->td_list);
+ }
+ spin_unlock_irqrestore(&ehci->lock, flags);
+
+ /* temporarily store schedule info in hcpriv */
+ urb->hcpriv = sched;
+ urb->error_count = 0;
+ return 0;
+}
+
+static inline int
+itd_slot_ok(
+ struct ehci_hcd *ehci,
+ u32 mod,
+ u32 uframe,
+ u8 usecs,
+ u32 period
+)
+{
+ uframe %= period;
+ do {
+ /* can't commit more than uframe_periodic_max usec */
+ if (periodic_usecs(ehci, uframe >> 3, uframe & 0x7)
+ > (ehci->uframe_periodic_max - usecs))
+ return 0;
+
+ /* we know urb->interval is 2^N uframes */
+ uframe += period;
+ } while (uframe < mod);
+ return 1;
+}
+
+/*
+ * This scheduler plans almost as far into the future as it has actual
+ * periodic schedule slots. (Affected by TUNE_FLS, which defaults to
+ * "as small as possible" to be cache-friendlier.) That limits the size
+ * transfers you can stream reliably; avoid more than 64 msec per urb.
+ * Also avoid queue depths of less than ehci's worst irq latency (affected
+ * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
+ * and other factors); or more than about 230 msec total (for portability,
+ * given EHCI_TUNE_FLS and the slop). Or, write a smarter scheduler!
+ */
+
+#define SCHEDULE_SLOP 80 /* microframes */
+
+static int
+iso_stream_schedule(
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ struct ehci_iso_stream *stream
+)
+{
+ u32 now, next, start, period, span;
+ int status;
+ unsigned mod = ehci->periodic_size << 3;
+ struct ehci_iso_sched *sched = urb->hcpriv;
+
+ period = urb->interval;
+ span = sched->span;
+
+ if (span > mod - SCHEDULE_SLOP) {
+ ehci_dbg(ehci, "iso request %p too long\n", urb);
+ status = -EFBIG;
+ goto fail;
+ }
+
+ now = ehci_read_frame_index(ehci) & (mod - 1);
+
+ /* Typical case: reuse current schedule, stream is still active.
+ * Hopefully there are no gaps from the host falling behind
+ * (irq delays etc), but if there are we'll take the next
+ * slot in the schedule, implicitly assuming URB_ISO_ASAP.
+ */
+ if (likely(!list_empty(&stream->td_list))) {
+ u32 excess;
+
+ /* Fell behind (by up to twice the slop amount)?
+ * We decide based on the time of the last currently-scheduled
+ * slot, not the time of the next available slot.
+ */
+ excess = (stream->next_uframe - period - now) & (mod - 1);
+ if (excess >= mod - 2 * SCHEDULE_SLOP)
+ start = now + excess - mod + period *
+ DIV_ROUND_UP(mod - excess, period);
+ else
+ start = now + excess + period;
+ if (start - now >= mod) {
+ ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n",
+ urb, start - now - period, period,
+ mod);
+ status = -EFBIG;
+ goto fail;
+ }
+ }
+
+ /* need to schedule; when's the next (u)frame we could start?
+ * this is bigger than ehci->i_thresh allows; scheduling itself
+ * isn't free, the slop should handle reasonably slow cpus. it
+ * can also help high bandwidth if the dma and irq loads don't
+ * jump until after the queue is primed.
+ */
+ else {
+ int done = 0;
+ start = SCHEDULE_SLOP + (now & ~0x07);
+
+ /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */
+
+ /* find a uframe slot with enough bandwidth.
+ * Early uframes are more precious because full-speed
+ * iso IN transfers can't use late uframes,
+ * and therefore they should be allocated last.
+ */
+ next = start;
+ start += period;
+ do {
+ start--;
+ /* check schedule: enough space? */
+ if (itd_slot_ok(ehci, mod, start, stream->usecs, period))
+ done = 1;
+
+ } while (start > next && !done);
+
+ /* no room in the schedule */
+ if (!done) {
+ ehci_dbg(ehci, "iso resched full %p (now %d max %d)\n",
+ urb, now, now + mod);
+ status = -ENOSPC;
+ goto fail;
+ }
+ }
+
+ /* Tried to schedule too far into the future? */
+ if (unlikely(start - now + span - period
+ >= mod - 2 * SCHEDULE_SLOP)) {
+ ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n",
+ urb, start - now, span - period,
+ mod - 2 * SCHEDULE_SLOP);
+ status = -EFBIG;
+ goto fail;
+ }
+ stream->next_uframe = start & (mod - 1);
+
+ /* report high speed start in uframes; full speed, in frames */
+ urb->start_frame = stream->next_uframe;
+
+ if (!stream->highspeed)
+ urb->start_frame >>= 3;
+
+ return 0;
+
+ fail:
+ iso_sched_free(stream, sched);
+ urb->hcpriv = NULL;
+ return status;
+}
+
+static inline void
+itd_init(struct ehci_hcd *ehci, struct ehci_iso_stream *stream,
+ struct ehci_itd *itd)
+{
+ int i;
+
+ /* it's been recently zeroed */
+ itd->hw_next = EHCI_LIST_END(ehci);
+ itd->hw_bufp[0] = stream->buf0;
+ itd->hw_bufp[1] = stream->buf1;
+ itd->hw_bufp[2] = stream->buf2;
+
+ for (i = 0; i < 8; i++)
+ itd->index[i] = -1;
+
+ /* All other fields are filled when scheduling */
+}
+
+static inline void
+itd_patch(
+ struct ehci_hcd *ehci,
+ struct ehci_itd *itd,
+ struct ehci_iso_sched *iso_sched,
+ unsigned index,
+ u16 uframe
+)
+{
+ struct ehci_iso_packet *uf = &iso_sched->packet[index];
+ unsigned pg = itd->pg;
+
+ uframe &= 0x07;
+ itd->index[uframe] = index;
+
+ itd->hw_transaction[uframe] = uf->transaction;
+ itd->hw_transaction[uframe] |= cpu_to_hc32(ehci, pg << 12);
+ itd->hw_bufp[pg] |= cpu_to_hc32(ehci, uf->bufp & ~(u32)0);
+ itd->hw_bufp_hi[pg] |= cpu_to_hc32(ehci, (u32)(uf->bufp >> 32));
+
+ /* iso_frame_desc[].offset must be strictly increasing */
+ if (unlikely(uf->cross)) {
+ u64 bufp = uf->bufp + 4096;
+
+ itd->pg = ++pg;
+ itd->hw_bufp[pg] |= cpu_to_hc32(ehci, bufp & ~(u32)0);
+ itd->hw_bufp_hi[pg] |= cpu_to_hc32(ehci, (u32)(bufp >> 32));
+ }
+}
+
+static inline void
+itd_link(struct ehci_hcd *ehci, unsigned frame, struct ehci_itd *itd)
+{
+ union ehci_shadow *prev = &ehci->pshadow[frame];
+ __hc32 *hw_p = &ehci->periodic[frame];
+ union ehci_shadow here = *prev;
+ __hc32 type = 0;
+
+ /* skip any iso nodes which might belong to previous microframes */
+ while (here.ptr) {
+ type = Q_NEXT_TYPE(ehci, *hw_p);
+ if (type == cpu_to_hc32(ehci, Q_TYPE_QH))
+ break;
+ prev = periodic_next_shadow(ehci, prev, type);
+ hw_p = shadow_next_periodic(ehci, &here, type);
+ here = *prev;
+ }
+ itd->itd_next = here;
+ itd->hw_next = *hw_p;
+ prev->itd = itd;
+ itd->frame = frame;
+ wmb();
+ *hw_p = cpu_to_hc32(ehci, itd->itd_dma | Q_TYPE_ITD);
+}
+
+/* fit urb's itds into the selected schedule slot; activate as needed */
+static int
+itd_link_urb(
+ struct ehci_hcd *ehci,
+ struct urb *urb,
+ unsigned mod,
+ struct ehci_iso_stream *stream
+)
+{
+ int packet;
+ unsigned next_uframe, uframe, frame;
+ struct ehci_iso_sched *iso_sched = urb->hcpriv;
+ struct ehci_itd *itd;
+
+ next_uframe = stream->next_uframe & (mod - 1);
+
+ if (unlikely(list_empty(&stream->td_list))) {
+ ehci_to_hcd(ehci)->self.bandwidth_allocated
+ += stream->bandwidth;
+ ehci_vdbg(ehci,
+ "schedule devp %s ep%d%s-iso period %d start %d.%d\n",
+ urb->dev->devpath, stream->bEndpointAddress & 0x0f,
+ (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
+ urb->interval,
+ next_uframe >> 3, next_uframe & 0x7);
+ }
+
+ ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++;
+
+ /* fill iTDs uframe by uframe */
+ for (packet = 0, itd = NULL; packet < urb->number_of_packets;) {
+ if (itd == NULL) {
+ /* ASSERT: we have all necessary itds */
+ /* BUG_ON (list_empty (&iso_sched->td_list)); */
+
+ /* ASSERT: no itds for this endpoint in this uframe */
+
+ itd = list_entry(iso_sched->td_list.next,
+ struct ehci_itd, itd_list);
+ list_move_tail(&itd->itd_list, &stream->td_list);
+ itd->stream = iso_stream_get(stream);
+ itd->urb = urb;
+ itd_init(ehci, stream, itd);
+ }
+
+ uframe = next_uframe & 0x07;
+ frame = next_uframe >> 3;
+
+ itd_patch(ehci, itd, iso_sched, packet, uframe);
+
+ next_uframe += stream->interval;
+ next_uframe &= mod - 1;
+ packet++;
+
+ /* link completed itds into the schedule */
+ if (((next_uframe >> 3) != frame)
+ || packet == urb->number_of_packets) {
+ itd_link(ehci, frame & (ehci->periodic_size - 1), itd);
+ itd = NULL;
+ }
+ }
+ stream->next_uframe = next_uframe;
+
+ /* don't need that schedule data any more */
+ iso_sched_free(stream, iso_sched);
+ urb->hcpriv = NULL;
+
+ timer_action(ehci, TIMER_IO_WATCHDOG);
+ return enable_periodic(ehci);
+}
+
+#define ISO_ERRS (EHCI_ISOC_BUF_ERR | EHCI_ISOC_BABBLE | EHCI_ISOC_XACTERR)
+
+/* Process and recycle a completed ITD. Return true iff its urb completed,
+ * and hence its completion callback probably added things to the hardware
+ * schedule.
+ *
+ * Note that we carefully avoid recycling this descriptor until after any
+ * completion callback runs, so that it won't be reused quickly. That is,
+ * assuming (a) no more than two urbs per frame on this endpoint, and also
+ * (b) only this endpoint's completions submit URBs. It seems some silicon
+ * corrupts things if you reuse completed descriptors very quickly...
+ */
+static unsigned
+itd_complete(
+ struct ehci_hcd *ehci,
+ struct ehci_itd *itd
+) {
+ struct urb *urb = itd->urb;
+ struct usb_iso_packet_descriptor *desc;
+ u32 t;
+ unsigned uframe;
+ int urb_index = -1;
+ struct ehci_iso_stream *stream = itd->stream;
+ struct usb_device *dev;
+ unsigned retval = false;
+ u32 itdDir = 0;
+
+ /* for each uframe with a packet */
+ for (uframe = 0; uframe < 8; uframe++) {
+ itdDir = hc32_to_cpup(ehci,
+ &itd->hw_bufp[1]) & (1 << 11);
+ if (likely(itd->index[uframe] == -1))
+ continue;
+ urb_index = itd->index[uframe];
+ desc = &urb->iso_frame_desc[urb_index];
+
+ t = hc32_to_cpup(ehci, &itd->hw_transaction[uframe]);
+ itd->hw_transaction[uframe] = 0;
+ /* report transfer status */
+ if (unlikely(t & ISO_ERRS)) {
+ urb->error_count++;
+ if (t & EHCI_ISOC_BUF_ERR)
+ desc->status = usb_pipein(urb->pipe)
+ ? -ENOSR /* hc couldn't read */
+ : -ECOMM; /* hc couldn't write */
+ else if (t & EHCI_ISOC_BABBLE)
+ desc->status = -EOVERFLOW;
+ else /* (t & EHCI_ISOC_XACTERR) */
+ desc->status = -EPROTO;
+
+ /* HC need not update length with this error */
+ /* add for fusbh200 */
+ if (!(t & EHCI_ISOC_BABBLE)) {
+ /* Faraday EHCI HC decrement the counter of the transaction
+ length for itd ISO IN (It is differ with EHCI Spec) So the
+ length means how many remaining bytes have not been sent by
+ host for ISO IN */
+ if (itdDir) {
+ desc->actual_length = desc->length - EHCI_ITD_LENGTH(t);
+ urb->actual_length += desc->actual_length;
+ } else {
+ desc->actual_length = EHCI_ITD_LENGTH(t);
+ urb->actual_length += desc->actual_length;
+ }
+ if (desc->actual_length < 0)
+ ehci_err(ehci, "Error: length < 0 (%x)\n",
+ desc->actual_length);
+ }
+
+
+ } else if (likely((t & EHCI_ISOC_ACTIVE) == 0)) {
+ desc->status = 0;
+ /* add for fusbh200 */
+ if (itdDir)
+ desc->actual_length =
+ desc->length - EHCI_ITD_LENGTH(t);
+ else
+ desc->actual_length = EHCI_ITD_LENGTH(t);
+ urb->actual_length += desc->actual_length;
+ } else {
+ /* URB was too late */
+ desc->status = -EXDEV;
+ }
+ }
+
+
+ /* handle completion now? */
+ if (likely((urb_index + 1) != urb->number_of_packets))
+ goto done;
+
+ /* ASSERT: it's really the last itd for this urb
+ list_for_each_entry (itd, &stream->td_list, itd_list)
+ BUG_ON (itd->urb == urb);
+ */
+
+ /* give urb back to the driver; completion often (re)submits */
+ dev = urb->dev;
+ ehci_urb_done(ehci, urb, 0);
+ retval = true;
+ urb = NULL;
+ (void) disable_periodic(ehci);
+ ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
+
+ if (unlikely(list_is_singular(&stream->td_list))) {
+ ehci_to_hcd(ehci)->self.bandwidth_allocated
+ -= stream->bandwidth;
+ ehci_vdbg(ehci,
+ "deschedule devp %s ep%d%s-iso\n",
+ dev->devpath, stream->bEndpointAddress & 0x0f,
+ (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
+ }
+ iso_stream_put(ehci, stream);
+
+done:
+ itd->urb = NULL;
+ if (ehci->clock_frame != itd->frame || itd->index[7] != -1) {
+ /* OK to recycle this ITD now. */
+ itd->stream = NULL;
+ list_move(&itd->itd_list, &stream->free_list);
+ iso_stream_put(ehci, stream);
+ } else {
+ /* HW might remember this ITD, so we can't recycle it yet.
+ * Move it to a safe place until a new frame starts.
+ */
+ list_move(&itd->itd_list, &ehci->cached_itd_list);
+ if (stream->refcount == 2) {
+ /* If iso_stream_put() were called here, stream
+ * would be freed. Instead, just prevent reuse.
+ */
+ stream->ep->hcpriv = NULL;
+ stream->ep = NULL;
+ }
+ }
+ return retval;
+}
+
+static int itd_submit(struct ehci_hcd *ehci, struct urb *urb,
+ gfp_t mem_flags)
+{
+ int status = -EINVAL;
+ unsigned long flags;
+ struct ehci_iso_stream *stream;
+
+ /* Get iso_stream head */
+ stream = iso_stream_find(ehci, urb);
+ if (unlikely(stream == NULL)) {
+ ehci_dbg(ehci, "can't get iso stream\n");
+ return -ENOMEM;
+ }
+ if (ehci_is_TDI(ehci)) {
+ u32 ehci_speed = ehci_port_speed(ehci, 0);
+ if (unlikely(urb->interval != stream->interval) &&
+ (ehci_speed == USB_PORT_STAT_HIGH_SPEED)) {
+ ehci_dbg(ehci,
+ "can't change iso interval %d --> %d\n",
+ stream->interval, urb->interval);
+ goto done;
+ }
+ } else {
+ if (unlikely(urb->interval != stream->interval)) {
+ ehci_dbg(ehci,
+ "can't change iso interval %d --> %d\n",
+ stream->interval, urb->interval);
+ goto done;
+ }
+ }
+
+#ifdef EHCI_URB_TRACE
+ ehci_dbg(ehci,
+ "%s %s urb %p ep%d%s len %d, %d pkts %d uframes[%p]\n",
+ __func__, urb->dev->devpath, urb,
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out",
+ urb->transfer_buffer_length,
+ urb->number_of_packets, urb->interval,
+ stream);
+#endif
+
+ /* allocate ITDs w/o locking anything */
+ status = itd_urb_transaction(stream, ehci, urb, mem_flags);
+ if (unlikely(status < 0)) {
+ ehci_dbg(ehci, "can't init itds\n");
+ goto done;
+ }
+
+ /* schedule ... need to lock */
+ spin_lock_irqsave(&ehci->lock, flags);
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
+ status = -ESHUTDOWN;
+ goto done_not_linked;
+ }
+ status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
+ if (unlikely(status))
+ goto done_not_linked;
+ status = iso_stream_schedule(ehci, urb, stream);
+ if (likely(status == 0))
+ itd_link_urb(ehci, urb, ehci->periodic_size << 3, stream);
+ else
+ usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
+done_not_linked:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+
+done:
+ if (unlikely(status < 0))
+ iso_stream_put(ehci, stream);
+ return status;
+}
+
+static void free_cached_lists(struct ehci_hcd *ehci)
+{
+ struct ehci_itd *itd, *n;
+ struct ehci_sitd *sitd, *sn;
+
+ list_for_each_entry_safe(itd, n, &ehci->cached_itd_list, itd_list) {
+ struct ehci_iso_stream *stream = itd->stream;
+ itd->stream = NULL;
+ list_move(&itd->itd_list, &stream->free_list);
+ iso_stream_put(ehci, stream);
+ }
+
+ list_for_each_entry_safe(sitd, sn, &ehci->cached_sitd_list, sitd_list) {
+ struct ehci_iso_stream *stream = sitd->stream;
+ sitd->stream = NULL;
+ list_move(&sitd->sitd_list, &stream->free_list);
+ iso_stream_put(ehci, stream);
+ }
+}
+
+static void
+scan_periodic(struct ehci_hcd *ehci)
+{
+ unsigned now_uframe, frame, clock, clock_frame, mod;
+ unsigned modified;
+ unsigned cur_frame;
+
+ mod = ehci->periodic_size << 3;
+ /*
+ * When running, scan from last scan point up to "now"
+ * else clean up by scanning everything that's left.
+ * Touches as few pages as possible: cache-friendly.
+ */
+ now_uframe = ehci->next_uframe;
+ if (ehci->rh_state == EHCI_RH_RUNNING) {
+ clock = ehci_read_frame_index(ehci);
+ clock_frame = (clock >> 3) & (ehci->periodic_size - 1);
+ } else {
+ clock = now_uframe + mod - 1;
+ clock_frame = -1;
+ }
+ if (ehci->clock_frame != clock_frame) {
+ free_cached_lists(ehci);
+ ehci->clock_frame = clock_frame;
+ }
+ cur_frame = clock_frame;
+ clock &= mod - 1;
+ clock_frame = clock >> 3;
+ ++ehci->periodic_stamp;
+ for (;;) {
+ union ehci_shadow q, *q_p;
+ __hc32 type, *hw_p;
+ unsigned incomplete = false;
+
+ frame = now_uframe >> 3;
+
+restart:
+ /* scan each element in frame's queue for completions */
+ q_p = &ehci->pshadow[frame];
+ hw_p = &ehci->periodic[frame];
+ q.ptr = q_p->ptr;
+ type = Q_NEXT_TYPE(ehci, *hw_p);
+ modified = 0;
+
+ while (q.ptr != NULL) {
+ unsigned uf;
+ union ehci_shadow temp;
+ int live;
+
+ live = (ehci->rh_state == EHCI_RH_RUNNING);
+ switch (hc32_to_cpu(ehci, type)) {
+ case Q_TYPE_QH:
+ /* handle any completions */
+ temp.qh = qh_get(q.qh);
+ type = Q_NEXT_TYPE(ehci, q.qh->hw->hw_next);
+ q = q.qh->qh_next;
+ if (temp.qh->stamp != ehci->periodic_stamp) {
+ modified = qh_completions(ehci, temp.qh);
+ if (!modified)
+ temp.qh->stamp = ehci->periodic_stamp;
+ if (unlikely(list_empty(&temp.qh->qtd_list) ||
+ temp.qh->needs_rescan))
+ intr_deschedule(ehci, temp.qh);
+ }
+ qh_put(temp.qh);
+ break;
+ case Q_TYPE_FSTN:
+ /* for "save place" FSTNs, look at QH entries
+ * in the previous frame for completions.
+ */
+ if (q.fstn->hw_prev != EHCI_LIST_END(ehci)) {
+ ehci_dbg(ehci, "ignoring FSTN cost ...\n");
+ }
+ type = Q_NEXT_TYPE(ehci, q.fstn->hw_next);
+ q = q.fstn->fstn_next;
+ break;
+ case Q_TYPE_ITD:
+ /* If this ITD is still active, leave it for
+ * later processing ... check the next entry.
+ * No need to check for activity unless the
+ * frame is current.
+ */
+ if (frame == clock_frame && live) {
+ rmb();
+ for (uf = 0; uf < 8; uf++) {
+ if (q.itd->hw_transaction[uf] &
+ ITD_ACTIVE(ehci))
+ break;
+ }
+ if (uf < 8) {
+ incomplete = true;
+ q_p = &q.itd->itd_next;
+ hw_p = &q.itd->hw_next;
+ type = Q_NEXT_TYPE(ehci,
+ q.itd->hw_next);
+ q = *q_p;
+ break;
+ }
+ }
+
+ /* Take finished ITDs out of the schedule
+ * and process them: recycle, maybe report
+ * URB completion. HC won't cache the
+ * pointer for much longer, if at all.
+ */
+ *q_p = q.itd->itd_next;
+ if (!ehci->use_dummy_qh ||
+ q.itd->hw_next != EHCI_LIST_END(ehci))
+ *hw_p = q.itd->hw_next;
+ else
+ *hw_p = ehci->dummy->qh_dma;
+ type = Q_NEXT_TYPE(ehci, q.itd->hw_next);
+ wmb();
+ modified = itd_complete(ehci, q.itd);
+ q = *q_p;
+ break;
+ default:
+ ehci_dbg(ehci, "corrupt type %d frame %d shadow %p\n",
+ type, frame, q.ptr);
+ q.ptr = NULL;
+ }
+
+ /* assume completion callbacks modify the queue */
+ if (unlikely(modified)) {
+ if (likely(ehci->periodic_sched > 0))
+ goto restart;
+ /* short-circuit this scan */
+ now_uframe = clock;
+ break;
+ }
+ }
+
+ /* If we can tell we caught up to the hardware, stop now.
+ * We can't advance our scan without collecting the ISO
+ * transfers that are still pending in this frame.
+ */
+ if (incomplete && ehci->rh_state == EHCI_RH_RUNNING) {
+ ehci->next_uframe = now_uframe;
+ break;
+ }
+
+ /* FIXME: this assumes we won't get lapped when */
+ /* latencies climb; that should be rare, but... */
+ /* detect it, and just go all the way around. */
+ /* FLR might help detect this case, so long as latencies*/
+ /* don't exceed periodic_size msec (default 1.024 sec). */
+
+ /* FIXME: likewise assumes HC doesn't halt mid-scan */
+
+ if (now_uframe == clock) {
+ unsigned now;
+
+ if (ehci->rh_state != EHCI_RH_RUNNING
+ || ehci->periodic_sched == 0)
+ break;
+ ehci->next_uframe = now_uframe;
+ now = ehci_read_frame_index(ehci) & (mod - 1);
+ if (now_uframe == now)
+ break;
+
+ /* rescan the rest of this frame, then ... */
+ clock = now;
+ clock_frame = clock >> 3;
+ if (ehci->clock_frame != clock_frame) {
+ free_cached_lists(ehci);
+ ehci->clock_frame = clock_frame;
+ ++ehci->periodic_stamp;
+ }
+ } else {
+ now_uframe++;
+ now_uframe &= mod - 1;
+ }
+ }
+}
+
+/* Display the ports dedicated to the companion controller */
+static ssize_t show_companion(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ehci_hcd *ehci;
+ int nports, index, n;
+ int count = PAGE_SIZE;
+ char *ptr = buf;
+
+ ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+ nports = HCS_N_PORTS(ehci->hcs_params);
+
+ for (index = 0; index < nports; ++index) {
+ if (test_bit(index, &ehci->companion_ports)) {
+ n = scnprintf(ptr, count, "%d\n", index + 1);
+ ptr += n;
+ count -= n;
+ }
+ }
+ return ptr - buf;
+}
+
+/*
+ * Dedicate or undedicate a port to the companion controller.
+ * Syntax is "[-]portnum", where a leading '-' sign means
+ * return control of the port to the EHCI controller.
+ */
+static ssize_t store_companion(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ehci_hcd *ehci;
+ int portnum, new_owner;
+
+ ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+ new_owner = PORT_OWNER; /* Owned by companion */
+ if (sscanf(buf, "%d", &portnum) != 1)
+ return -EINVAL;
+ if (portnum < 0) {
+ portnum = -portnum;
+ new_owner = 0; /* Owned by EHCI */
+ }
+ if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
+ return -ENOENT;
+ portnum--;
+ if (new_owner)
+ set_bit(portnum, &ehci->companion_ports);
+ else
+ clear_bit(portnum, &ehci->companion_ports);
+ set_owner(ehci, portnum, new_owner);
+ return count;
+}
+
+static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
+
+/*
+ * Display / Set uframe_periodic_max
+ */
+static ssize_t show_uframe_periodic_max(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ehci_hcd *ehci;
+ int n;
+
+ ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+ n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max);
+ return n;
+}
+
+static ssize_t store_uframe_periodic_max(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ehci_hcd *ehci;
+ unsigned uframe_periodic_max;
+ unsigned frame, uframe;
+ unsigned short allocated_max;
+ unsigned long flags;
+ ssize_t ret;
+
+ ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+ if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
+ return -EINVAL;
+
+ if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
+ ehci_info(ehci, "rejecting invalid request for "
+ "uframe_periodic_max=%u\n", uframe_periodic_max);
+ return -EINVAL;
+ }
+
+ ret = -EINVAL;
+
+ /*
+ * lock, so that our checking does not race with possible periodic
+ * bandwidth allocation through submitting new urbs.
+ */
+ spin_lock_irqsave(&ehci->lock, flags);
+
+ /*
+ * for request to decrease max periodic bandwidth, we have to check
+ * every microframe in the schedule to see whether the decrease is
+ * possible.
+ */
+ if (uframe_periodic_max < ehci->uframe_periodic_max) {
+ allocated_max = 0;
+
+ for (frame = 0; frame < ehci->periodic_size; ++frame)
+ for (uframe = 0; uframe < 7; ++uframe)
+ allocated_max = max(allocated_max,
+ periodic_usecs(ehci, frame, uframe));
+
+ if (allocated_max > uframe_periodic_max) {
+ ehci_info(ehci,
+ "cannot decrease uframe_periodic_max becase "
+ "periodic bandwidth is already allocated "
+ "(%u > %u)\n",
+ allocated_max, uframe_periodic_max);
+ goto out_unlock;
+ }
+ }
+
+ /* increasing is always ok */
+
+ ehci_info(ehci, "setting max periodic bandwidth to %u%% "
+ "(== %u usec/uframe)\n",
+ 100*uframe_periodic_max/125, uframe_periodic_max);
+
+ if (uframe_periodic_max != 100)
+ ehci_warn(ehci, "max periodic bandwidth set is non-standard\n");
+
+ ehci->uframe_periodic_max = uframe_periodic_max;
+ ret = count;
+
+out_unlock:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ return ret;
+}
+static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max);
+
+
+static inline int create_sysfs_files(struct ehci_hcd *ehci)
+{
+ struct device *controller = ehci_to_hcd(ehci)->self.controller;
+ int i = 0;
+
+ /* with integrated TT there is no companion! */
+ if (!ehci_is_TDI(ehci))
+ i = device_create_file(controller, &dev_attr_companion);
+ if (i)
+ goto out;
+
+ i = device_create_file(controller, &dev_attr_uframe_periodic_max);
+out:
+ return i;
+}
+
+static inline void remove_sysfs_files(struct ehci_hcd *ehci)
+{
+ struct device *controller = ehci_to_hcd(ehci)->self.controller;
+
+ /* with integrated TT there is no companion! */
+ if (!ehci_is_TDI(ehci))
+ device_remove_file(controller, &dev_attr_companion);
+
+ device_remove_file(controller, &dev_attr_uframe_periodic_max);
+}
+
+static void ehci_iaa_watchdog(unsigned long param)
+{
+ struct ehci_hcd *ehci = (struct ehci_hcd *) param;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ehci->lock, flags);
+
+ /* Lost IAA irqs wedge things badly; seen first with a vt8235.
+ * So we need this watchdog, but must protect it against both
+ * (a) SMP races against real IAA firing and retriggering, and
+ * (b) clean HC shutdown, when IAA watchdog was pending.
+ */
+ if (ehci->reclaim
+ && !timer_pending(&ehci->iaa_watchdog)
+ && ehci->rh_state == EHCI_RH_RUNNING) {
+ u32 cmd, status;
+
+ /* If we get here, IAA is *REALLY* late. It's barely
+ * conceivable that the system is so busy that CMD_IAAD
+ * is still legitimately set, so let's be sure it's
+ * clear before we read STS_IAA. (The HC should clear
+ * CMD_IAAD when it sets STS_IAA.)
+ */
+ cmd = ehci_readl(ehci, &ehci->regs->command);
+ if (cmd & CMD_IAAD)
+ ehci_writel(ehci, cmd & ~CMD_IAAD,
+ &ehci->regs->command);
+
+ /* If IAA is set here it either legitimately triggered
+ * before we cleared IAAD above (but _way_ late, so we'll
+ * still count it as lost) ... or a silicon erratum:
+ * - VIA seems to set IAA without triggering the IRQ;
+ * - IAAD potentially cleared without setting IAA.
+ */
+ status = ehci_readl(ehci, &ehci->regs->status);
+ if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
+ COUNT(ehci->stats.lost_iaa);
+ ehci_writel(ehci, STS_IAA, &ehci->regs->status);
+ }
+
+ ehci_vdbg(ehci, "IAA watchdog: status %x cmd %x\n",
+ status, cmd);
+ end_unlink_async(ehci);
+ }
+
+ spin_unlock_irqrestore(&ehci->lock, flags);
+}
+
+static void ehci_watchdog(unsigned long param)
+{
+ struct ehci_hcd *ehci = (struct ehci_hcd *) param;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ehci->lock, flags);
+ /* stop async processing after it's idled a bit */
+ if (test_bit(TIMER_ASYNC_OFF, &ehci->actions))
+ start_unlink_async(ehci, ehci->async);
+
+ /* ehci could run by timer, without IRQs ... */
+ ehci_work(ehci);
+
+ spin_unlock_irqrestore(&ehci->lock, flags);
+}
+
+/* one-time init, only for memory state */
+static int fusbh200_ehci_init(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ u32 temp;
+ int retval;
+ u32 hcc_params;
+ struct ehci_qh_hw *hw;
+
+ spin_lock_init(&ehci->lock);
+
+ /*
+ * keep io watchdog by default, those good HCDs could turn off it later
+ */
+ ehci->need_io_watchdog = 1;
+ init_timer(&ehci->watchdog);
+ ehci->watchdog.function = ehci_watchdog;
+ ehci->watchdog.data = (unsigned long) ehci;
+
+ init_timer(&ehci->iaa_watchdog);
+ ehci->iaa_watchdog.function = ehci_iaa_watchdog;
+ ehci->iaa_watchdog.data = (unsigned long) ehci;
+
+ hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
+
+ /*
+ * by default set standard 80% (== 100 usec/uframe) max periodic
+ * bandwidth as required by USB 2.0
+ */
+ ehci->uframe_periodic_max = 100;
+
+ /*
+ * hw default: 1K periodic list heads, one per frame.
+ * periodic_size can shrink by USBCMD update if hcc_params allows.
+ */
+ ehci->periodic_size = DEFAULT_I_TDPS;
+ INIT_LIST_HEAD(&ehci->cached_itd_list);
+ INIT_LIST_HEAD(&ehci->cached_sitd_list);
+
+ if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
+ /* periodic schedule size can be smaller than default */
+ switch (EHCI_TUNE_FLS) {
+ case 0:
+ ehci->periodic_size = 1024;
+ break;
+ case 1:
+ ehci->periodic_size = 512;
+ break;
+ case 2:
+ ehci->periodic_size = 256;
+ break;
+ default:
+ BUG();
+ }
+ }
+ retval = ehci_mem_init(ehci, GFP_KERNEL);
+ if (retval < 0)
+ return retval;
+
+ /* controllers may cache some of the periodic schedule ... */
+ if (HCC_ISOC_CACHE(hcc_params))/* full frame cache */
+ ehci->i_thresh = 2 + 8;
+ else /* N microframes cached */
+ ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
+
+ ehci->reclaim = NULL;
+ ehci->next_uframe = -1;
+ ehci->clock_frame = -1;
+
+ /*
+ * dedicate a qh for the async ring head, since we couldn't unlink
+ * a 'real' qh without stopping the async schedule [4.8]. use it
+ * as the 'reclamation list head' too.
+ * its dummy is used in hw_alt_next of many tds, to prevent the qh
+ * from automatically advancing to the next td after short reads.
+ */
+ ehci->async->qh_next.qh = NULL;
+ hw = ehci->async->hw;
+ hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
+ hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
+ hw->hw_info1 |= cpu_to_hc32(ehci, (1 << 7)); /* I = 1 */
+ hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
+ hw->hw_qtd_next = EHCI_LIST_END(ehci);
+ ehci->async->qh_state = QH_STATE_LINKED;
+ hw->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
+
+ /* clear interrupt enables, set irq latency */
+ if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
+ log2_irq_thresh = 0;
+ temp = 1 << (16 + log2_irq_thresh);
+ if (HCC_CANPARK(hcc_params)) {
+ /* HW default park == 3, on hardware that supports it (like
+ * NVidia and ALI silicon), maximizes throughput on the async
+ * schedule by avoiding QH fetches between transfers.
+ *
+ * With fast usb storage devices and NForce2, "park" seems to
+ * make problems: throughput reduction (!), data errors...
+ */
+ if (park) {
+ park = min(park, (unsigned) 3);
+ temp |= CMD_PARK;
+ temp |= park << 8;
+ }
+ ehci_dbg(ehci, "park %d\n", park);
+ }
+ if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
+ /* periodic schedule size can be smaller than default */
+ temp &= ~(3 << 2);
+ temp |= (EHCI_TUNE_FLS << 2);
+ }
+ ehci->command = temp;
+
+ /* Accept arbitrarily long scatter-gather lists */
+ if (!(hcd->driver->flags & HCD_LOCAL_MEM))
+ hcd->self.sg_tablesize = ~0;
+ return 0;
+}
+
+static int fusbh200_ehci_hub_control(
+ struct usb_hcd *hcd,
+ u16 typeReq,
+ u16 wValue,
+ u16 wIndex,
+ char *buf,
+ u16 wLength
+);
+
+static void ehci_port_power(struct ehci_hcd *ehci, int is_on)
+{
+ unsigned port;
+
+ if (!HCS_PPC(ehci->hcs_params))
+ return;
+
+ ehci_dbg(ehci, "...power%s ports...\n", is_on ? "up" : "down");
+ for (port = HCS_N_PORTS(ehci->hcs_params); port > 0;)
+ (void) fusbh200_ehci_hub_control(ehci_to_hcd(ehci),
+ is_on ? SetPortFeature : ClearPortFeature,
+ USB_PORT_FEAT_POWER,
+ port--, NULL, 0);
+ /* Flush those writes */
+ ehci_readl(ehci, &ehci->regs->command);
+ msleep(20);
+}
+
+/*
+ * ehci_work is called from some interrupts, timers, and so on.
+ * it calls driver completion functions, after dropping ehci->lock.
+ */
+static void ehci_work(struct ehci_hcd *ehci)
+{
+ timer_action_done(ehci, TIMER_IO_WATCHDOG);
+
+ /* another CPU may drop ehci->lock during a schedule scan while
+ * it reports urb completions. this flag guards against bogus
+ * attempts at re-entrant schedule scanning.
+ */
+ if (ehci->scanning)
+ return;
+ ehci->scanning = 1;
+ scan_async(ehci);
+ if (ehci->next_uframe != -1)
+ scan_periodic(ehci);
+ ehci->scanning = 0;
+
+ /* the IO watchdog guards against hardware or driver bugs that
+ * misplace IRQs, and should let us run completely without IRQs.
+ * such lossage has been observed on both VT6202 and VT8235.
+ */
+ if (ehci->rh_state == EHCI_RH_RUNNING &&
+ (ehci->async->qh_next.ptr != NULL ||
+ ehci->periodic_sched != 0))
+ timer_action(ehci, TIMER_IO_WATCHDOG);
+}
+
+static void reset_host(struct ehci_hcd *ehci)
+{
+ u32 regcommand, regenable;
+ u32 i, temp;
+
+ regcommand = readl(&ehci->regs->command);
+ regenable = readl(&ehci->regs->intr_enable);
+
+ writel(CMD_RESET, &ehci->regs->command);
+ i = 0;
+ temp = CMD_RESET;
+ while (((temp & CMD_RESET)) && (i <= 1000)) {
+ mdelay(1);
+ i++;
+ temp = readl(&ehci->regs->command);
+ }
+ writel(regenable, &ehci->regs->intr_enable);
+ writel(regcommand, &ehci->regs->command);
+ mdelay(1);
+ writel(regcommand | CMD_RUN, &ehci->regs->command);
+}
+
+static irqreturn_t fusbh200_ehci_irq(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ u32 status, masked_status, pcd_status = 0, cmd;
+ int bh = 0;
+ u32 __iomem *reg_ptr;
+ u32 tmp;
+
+ spin_lock(&ehci->lock);
+ /* add for fusbh200 */
+ reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->caps) +
+ FUSBH200_BMISR);
+ tmp = ehci_readl(ehci, reg_ptr);
+
+ if (tmp & FUSBH200_BMISR_OVC) {
+ printk("Over current!!\n");
+ ehci_writel(ehci, FUSBH200_BMISR_OVC, reg_ptr);
+ reset_host(ehci);
+ spin_unlock(&ehci->lock);
+ return IRQ_HANDLED;
+ } else if (tmp & FUSBH200_BMISR_VBUS_ERR) {
+ printk("Vbus Error!!\n");
+ ehci_writel(ehci, FUSBH200_BMISR_VBUS_ERR, reg_ptr);
+ reset_host(ehci);
+ spin_unlock(&ehci->lock);
+ return IRQ_HANDLED;
+ }
+
+ status = ehci_readl(ehci, &ehci->regs->status);
+
+ /* e.g. cardbus physical eject */
+ if (status == ~(u32) 0) {
+ ehci_dbg(ehci, "device removed\n");
+ goto dead;
+ }
+
+ /* Shared IRQ? */
+ masked_status = status & INTR_MASK;
+ if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
+ spin_unlock(&ehci->lock);
+ return IRQ_NONE;
+ }
+
+ /* clear (just) interrupts */
+ ehci_writel(ehci, masked_status, &ehci->regs->status);
+ cmd = ehci_readl(ehci, &ehci->regs->command);
+ bh = 0;
+
+#ifdef VERBOSE_DEBUG
+ /* unrequested/ignored: Frame List Rollover */
+ dbg_status(ehci, "irq", status);
+#endif
+
+ /* INT, ERR, and IAA interrupt rates can be throttled */
+
+ /* normal [4.15.1.2] or error [4.15.1.1] completion */
+ if (likely((status & (STS_INT|STS_ERR)) != 0)) {
+ if (likely((status & STS_ERR) == 0))
+ COUNT(ehci->stats.normal);
+ else
+ COUNT(ehci->stats.error);
+ bh = 1;
+ }
+
+ /* complete the unlinking of some qh [4.15.2.3] */
+ if (status & STS_IAA) {
+ /* guard against (alleged) silicon errata */
+ if (cmd & CMD_IAAD) {
+ ehci_writel(ehci, cmd & ~CMD_IAAD,
+ &ehci->regs->command);
+ ehci_dbg(ehci, "IAA with IAAD still set?\n");
+ }
+ if (ehci->reclaim) {
+ COUNT(ehci->stats.reclaim);
+ end_unlink_async(ehci);
+ } else
+ ehci_dbg(ehci, "IAA with nothing to reclaim?\n");
+ }
+
+ /* remote wakeup [4.3.1] */
+ if (status & STS_PCD) {
+ unsigned i = HCS_N_PORTS(ehci->hcs_params);
+ u32 ppcd = 0;
+
+ /* kick root hub later */
+ pcd_status = status;
+
+ /* resume root hub? */
+ if (!(cmd & CMD_RUN))
+ usb_hcd_resume_root_hub(hcd);
+
+ /* add for fusbh200 */
+ if (!(cmd & CMD_RUN)) {
+ u32 i = 0;
+ u32 temp = ehci_readl(ehci, &ehci->regs->status);
+
+ while ((!(temp & STS_HALT)) && (i < 1000)) {
+ udelay(125);
+ i++;
+ temp = ehci_readl(ehci, &ehci->regs->status);
+ }
+
+ if (i < 1000) {
+ temp = ehci_readl(ehci, &ehci->regs->command);
+ temp |= CMD_RUN;
+ ehci_writel(ehci, temp, &ehci->regs->command);
+
+ i = 0;
+ temp = ehci_readl(ehci, &ehci->regs->status);
+ while ((temp & STS_HALT) && (i < 10)) {
+ udelay(125);
+ i++;
+ temp = ehci_readl(ehci, &ehci->regs->status);
+ }
+
+ if (i > 0)
+ printk("polling NOT HALT times.....%d\n", i);
+ } else {
+ u32 i, temp;
+ u32 regcommand = readl(&ehci->regs->command);
+ u32 regenable = readl(&ehci->regs->intr_enable);
+
+ printk("Host cannot exit HALT state, recover.....\n");
+ writel(CMD_RESET, &ehci->regs->command);
+ i = 0;
+ temp = CMD_RESET;
+
+ while (((temp & CMD_RESET)) && (i <= 100)) {
+ mdelay(3);
+ i++;
+ temp = readl(&ehci->regs->command);
+ }
+ printk("exit HALT OK.....%d\n", i);
+ writel(regenable, &ehci->regs->intr_enable);
+ writel(regcommand, &ehci->regs->command);
+ mdelay(1);
+ writel(regcommand | CMD_RUN, &ehci->regs->command);
+ printk("Host-halt recover OK\n");
+ }
+ }
+
+ /* get per-port change detect bits */
+ if (ehci->has_ppcd)
+ ppcd = status >> 16;
+
+ while (i--) {
+ int pstatus;
+
+ /* leverage per-port change bits feature */
+ if (ehci->has_ppcd && !(ppcd & (1 << i)))
+ continue;
+ pstatus = ehci_readl(ehci,
+ &ehci->regs->port_status[i]);
+
+ if (pstatus & PORT_OWNER)
+ continue;
+ if (!(test_bit(i, &ehci->suspended_ports) &&
+ ((pstatus & PORT_RESUME) ||
+ !(pstatus & PORT_SUSPEND)) &&
+ (pstatus & PORT_PE) &&
+ ehci->reset_done[i] == 0))
+ continue;
+
+ /* start 20 msec resume signaling from this port,
+ * and make khubd collect PORT_STAT_C_SUSPEND to
+ * stop that signaling. Use 5 ms extra for safety,
+ * like usb_port_resume() does.
+ */
+ ehci->reset_done[i] = jiffies + msecs_to_jiffies(25);
+ ehci_dbg(ehci, "port %d remote wakeup\n", i + 1);
+ mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
+ }
+ }
+
+ /* PCI errors [4.15.2.4] */
+ if (unlikely((status & STS_FATAL) != 0)) {
+ u32 i, temp;
+ u32 regcommand = readl(&ehci->regs->command);
+ u32 regenable = readl(&ehci->regs->intr_enable);
+
+ printk("Fatal error.....\n");
+
+ writel(CMD_RESET, &ehci->regs->command);
+ i = 0;
+ temp = CMD_RESET;
+
+ while (((temp & CMD_RESET)) && (i <= 100)) {
+ mdelay(3);
+ i++;
+ temp = readl(&ehci->regs->command);
+ }
+
+ writel(regenable, &ehci->regs->intr_enable);
+ writel(regcommand, &ehci->regs->command);
+ mdelay(1);
+ writel(regcommand | CMD_RUN, &ehci->regs->command);
+ printk("recover OK\n");
+ }
+dead:
+ if (bh)
+ ehci_work(ehci);
+ spin_unlock(&ehci->lock);
+ if (pcd_status)
+ usb_hcd_poll_rh_status(hcd);
+ return IRQ_HANDLED;
+}
+
+/* start HC running; it's halted, ehci_init() has been run (once) */
+static int fusbh200_ehci_run(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ u32 temp;
+ u32 hcc_params;
+
+ hcd->uses_new_polling = 1;
+
+ /* EHCI spec section 4.1 */
+
+ ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
+ ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
+
+ /*
+ * hcc_params controls whether ehci->regs->segment must (!!!)
+ * be used; it constrains QH/ITD/SITD and QTD locations.
+ * pci_pool consistent memory always uses segment zero.
+ * streaming mappings for I/O buffers, like pci_map_single(),
+ * can return segments above 4GB, if the device allows.
+ *
+ * NOTE: the dma mask is visible through dma_supported(), so
+ * drivers can pass this info along ... like NETIF_F_HIGHDMA,
+ * Scsi_Host.highmem_io, and so forth. It's readonly to all
+ * host side drivers though.
+ */
+ hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
+ if (HCC_64BIT_ADDR(hcc_params)) {
+ ehci_writel(ehci, 0, &ehci->regs->segment);
+ }
+
+ /* Philips, Intel, and maybe others need CMD_RUN before the
+ root hub will detect new devices (why?); NEC doesn't*/
+ ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
+ /* fusbh200: enable park mode */
+ ehci->command |= CMD_PARK | (3 << 8);
+ ehci->command |= CMD_RUN;
+ ehci_writel(ehci, ehci->command, &ehci->regs->command);
+ dbg_cmd(ehci, "init", ehci->command);
+
+ /*
+ * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
+ * are explicitly handed to companion controller(s), so no TT is
+ * involved with the root hub. (Except where one is integrated,
+ * and there's no companion controller unless maybe for USB OTG.)
+ *
+ * Turning on the CF flag will transfer ownership of all ports
+ * from the companions to the EHCI controller. If any of the
+ * companions are in the middle of a port reset at the time, it
+ * could cause trouble. Write-locking ehci_cf_port_reset_rwsem
+ * guarantees that no resets are in progress. After we set CF,
+ * a short delay lets the hardware catch up; new resets shouldn't
+ * be started before the port switching actions could complete.
+ */
+ down_write(&ehci_cf_port_reset_rwsem);
+ ehci->rh_state = EHCI_RH_RUNNING;
+ ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+ ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
+ /* fusbh200: cannot busy wait, use short delay */
+ udelay(500);
+ up_write(&ehci_cf_port_reset_rwsem);
+ ehci->last_periodic_enable = ktime_get_real();
+
+ temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
+ ehci_info(ehci,
+ "USB %x.%x started, EHCI %x.%02x%s\n",
+ ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
+ temp >> 8, temp & 0xff,
+ ignore_oc ? ", overcurrent ignored" : "");
+
+ ehci_writel(ehci, INTR_MASK,
+ &ehci->regs->intr_enable); /* Turn On Interrupts */
+
+ /* GRR this is run-once init(), being done every time the HC starts.
+ * So long as they're part of class devices, we can't do it init()
+ * since the class device isn't created that early.
+ */
+ create_debug_files(ehci);
+ create_sysfs_files(ehci);
+
+ return 0;
+}
+
+/* On some systems, leaving remote wakeup enabled prevents system shutdown.
+ * The firmware seems to think that powering off is a wakeup event!
+ * This routine turns off remote wakeup and everything else, on all ports.
+ */
+static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
+{
+ int port = HCS_N_PORTS(ehci->hcs_params);
+
+ while (port--)
+ ehci_writel(ehci, PORT_RWC_BITS,
+ &ehci->regs->port_status[port]);
+}
+
+/*
+ * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
+ * Should be called with ehci->lock held.
+ */
+static void ehci_silence_controller(struct ehci_hcd *ehci)
+{
+ fusbh200_ehci_halt(ehci);
+ ehci_turn_off_all_ports(ehci);
+
+ /* make BIOS/etc use companion controller during reboot */
+ ehci_writel(ehci, 0, &ehci->regs->configured_flag);
+
+ /* unblock posted writes */
+ ehci_readl(ehci, &ehci->regs->configured_flag);
+}
+
+/*
+ * Called when the ehci_hcd module is removed.
+ */
+static void fusbh200_ehci_stop(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+ ehci_dbg(ehci, "stop\n");
+
+ /* no more interrupts ... */
+ del_timer_sync(&ehci->watchdog);
+ del_timer_sync(&ehci->iaa_watchdog);
+
+ spin_lock_irq(&ehci->lock);
+ if (ehci->rh_state == EHCI_RH_RUNNING)
+ ehci_quiesce(ehci);
+
+ ehci_silence_controller(ehci);
+ ehci_reset(ehci);
+ spin_unlock_irq(&ehci->lock);
+
+ remove_sysfs_files(ehci);
+ remove_debug_files(ehci);
+
+ /* root hub is shut down separately (first, when possible) */
+ spin_lock_irq(&ehci->lock);
+ if (ehci->async)
+ ehci_work(ehci);
+ spin_unlock_irq(&ehci->lock);
+ ehci_mem_cleanup(ehci);
+
+#ifdef EHCI_STATS
+ ehci_dbg(ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
+ ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
+ ehci->stats.lost_iaa);
+ ehci_dbg(ehci, "complete %ld unlink %ld\n",
+ ehci->stats.complete, ehci->stats.unlink);
+#endif
+
+ dbg_status(ehci, "ehci_stop completed",
+ ehci_readl(ehci, &ehci->regs->status));
+}
+
+/* fusbh200_ehci_shutdown kick in for silicon on any bus (not just pci, etc).
+ * This forcibly disables dma and IRQs, helping kexec and other cases
+ * where the next system software may expect clean state.
+ */
+static void fusbh200_ehci_shutdown(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+ del_timer_sync(&ehci->watchdog);
+ del_timer_sync(&ehci->iaa_watchdog);
+
+ spin_lock_irq(&ehci->lock);
+ ehci_silence_controller(ehci);
+ spin_unlock_irq(&ehci->lock);
+}
+
+static void
+fusbh200_ehci_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ unsigned long flags;
+ struct ehci_qh *qh, *tmp;
+
+ /* ASSERT: any requests/urbs are being unlinked */
+ /* ASSERT: nobody can be submitting urbs for this any more */
+
+rescan:
+ spin_lock_irqsave(&ehci->lock, flags);
+ qh = ep->hcpriv;
+ if (!qh)
+ goto done;
+
+ /* endpoints can be iso streams. for now, we don't
+ * accelerate iso completions ... so spin a while.
+ */
+ if (qh->hw == NULL) {
+ ehci_vdbg(ehci, "iso delay\n");
+ goto idle_timeout;
+ }
+
+ if (ehci->rh_state != EHCI_RH_RUNNING)
+ qh->qh_state = QH_STATE_IDLE;
+ switch (qh->qh_state) {
+ case QH_STATE_LINKED:
+ case QH_STATE_COMPLETING:
+ for (tmp = ehci->async->qh_next.qh;
+ tmp && tmp != qh;
+ tmp = tmp->qh_next.qh)
+ continue;
+ /* periodic qh self-unlinks on empty, and a COMPLETING qh
+ * may already be unlinked.
+ */
+ if (tmp)
+ unlink_async(ehci, qh);
+ /* FALL THROUGH */
+ case QH_STATE_UNLINK: /* wait for hw to finish? */
+ case QH_STATE_UNLINK_WAIT:
+idle_timeout:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ schedule_timeout_uninterruptible(1);
+ goto rescan;
+ case QH_STATE_IDLE: /* fully unlinked */
+ if (qh->clearing_tt)
+ goto idle_timeout;
+ if (list_empty(&qh->qtd_list)) {
+ qh_put(qh);
+ break;
+ }
+ /* else FALL THROUGH */
+ default:
+ /* caller was supposed to have unlinked any requests;
+ * that's not our job. just leak this memory.
+ */
+ ehci_err(ehci, "qh %p (#%02x) state %d%s\n",
+ qh, ep->desc.bEndpointAddress, qh->qh_state,
+ list_empty(&qh->qtd_list) ? "" : "(has tds)");
+ break;
+ }
+ ep->hcpriv = NULL;
+done:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+}
+
+static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh);
+
+static void
+fusbh200_ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ struct ehci_qh *qh;
+ int eptype = usb_endpoint_type(&ep->desc);
+ int epnum = usb_endpoint_num(&ep->desc);
+ int is_out = usb_endpoint_dir_out(&ep->desc);
+ unsigned long flags;
+
+ if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
+ return;
+
+ spin_lock_irqsave(&ehci->lock, flags);
+ qh = ep->hcpriv;
+
+ /* For Bulk and Interrupt endpoints we maintain the toggle state
+ * in the hardware; the toggle bits in udev aren't used at all.
+ * When an endpoint is reset by usb_clear_halt() we must reset
+ * the toggle bit in the QH.
+ */
+ if (qh) {
+ usb_settoggle(qh->dev, epnum, is_out, 0);
+ if (!list_empty(&qh->qtd_list)) {
+ WARN_ONCE(1, "clear_halt for a busy endpoint\n");
+ } else if (qh->qh_state == QH_STATE_LINKED ||
+ qh->qh_state == QH_STATE_COMPLETING) {
+
+ /* The toggle value in the QH can't be updated
+ * while the QH is active. Unlink it now;
+ * re-linking will call qh_refresh().
+ */
+ if (eptype == USB_ENDPOINT_XFER_BULK)
+ unlink_async(ehci, qh);
+ else
+ intr_deschedule(ehci, qh);
+ }
+ }
+ spin_unlock_irqrestore(&ehci->lock, flags);
+}
+
+static int fusbh200_ehci_get_frame(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
+}
+
+#ifdef CONFIG_PM
+static int fusbh200_ehci_bus_suspend(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int port;
+ int mask;
+ int changed;
+
+ ehci_dbg(ehci, "suspend root hub\n");
+
+ if (time_before(jiffies, ehci->next_statechange))
+ msleep(5);
+ del_timer_sync(&ehci->watchdog);
+ del_timer_sync(&ehci->iaa_watchdog);
+
+ spin_lock_irq(&ehci->lock);
+
+ /* Once the controller is stopped, port resumes that are already
+ * in progress won't complete. Hence if remote wakeup is enabled
+ * for the root hub and any ports are in the middle of a resume or
+ * remote wakeup, we must fail the suspend.
+ */
+ if (hcd->self.root_hub->do_remote_wakeup) {
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ if (ehci->reset_done[port] != 0) {
+ spin_unlock_irq(&ehci->lock);
+ ehci_dbg(ehci, "suspend failed because "
+ "port %d is resuming\n",
+ port + 1);
+ return -EBUSY;
+ }
+ }
+ }
+
+ /* stop schedules, clean any completed work */
+ if (ehci->rh_state == EHCI_RH_RUNNING)
+ ehci_quiesce(ehci);
+ ehci->command = ehci_readl(ehci, &ehci->regs->command);
+ ehci_work(ehci);
+
+ /* Unlike other USB host controller types, EHCI doesn't have
+ * any notion of "global" or bus-wide suspend. The driver has
+ * to manually suspend all the active unsuspended ports, and
+ * then manually resume them in the bus_resume() routine.
+ */
+ ehci->bus_suspended = 0;
+ ehci->owned_ports = 0;
+ changed = 0;
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ u32 __iomem *reg = &ehci->regs->port_status[port];
+ u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
+ u32 t2 = t1 & ~PORT_WAKE_BITS;
+
+ /* keep track of which ports we suspend */
+ if (t1 & PORT_OWNER)
+ set_bit(port, &ehci->owned_ports);
+ else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
+ t2 |= PORT_SUSPEND;
+ set_bit(port, &ehci->bus_suspended);
+ }
+
+ /* enable remote wakeup on all ports, if told to do so */
+ if (hcd->self.root_hub->do_remote_wakeup) {
+ /* only enable appropriate wake bits, otherwise the
+ * hardware can not go phy low power mode. If a race
+ * condition happens here(connection change during bits
+ * set), the port change detection will finally fix it.
+ */
+ if (t1 & PORT_CONNECT)
+ t2 |= PORT_WKOC_E | PORT_WKDISC_E;
+ else
+ t2 |= PORT_WKOC_E | PORT_WKCONN_E;
+ }
+
+ if (t1 != t2) {
+ ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
+ port + 1, t1, t2);
+ ehci_writel(ehci, t2, reg);
+ changed = 1;
+ }
+ }
+
+ if (changed && ehci->has_hostpc) {
+ spin_unlock_irq(&ehci->lock);
+ msleep(5); /* 5 ms for HCD to enter low-power mode */
+ spin_lock_irq(&ehci->lock);
+
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ u32 __iomem *hostpc_reg;
+ u32 t3;
+
+ hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
+ + HOSTPC0 + 4 * port);
+ t3 = ehci_readl(ehci, hostpc_reg);
+ ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
+ t3 = ehci_readl(ehci, hostpc_reg);
+ ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
+ port, (t3 & HOSTPC_PHCD) ?
+ "succeeded" : "failed");
+ }
+ }
+
+ /* Apparently some devices need a >= 1-uframe delay here */
+ if (ehci->bus_suspended)
+ udelay(150);
+
+ /* turn off now-idle HC */
+ fusbh200_ehci_halt(ehci);
+ ehci->rh_state = EHCI_RH_SUSPENDED;
+
+ if (ehci->reclaim)
+ end_unlink_async(ehci);
+
+ /* allow remote wakeup */
+ mask = INTR_MASK;
+ if (!hcd->self.root_hub->do_remote_wakeup)
+ mask &= ~STS_PCD;
+ ehci_writel(ehci, mask, &ehci->regs->intr_enable);
+ ehci_readl(ehci, &ehci->regs->intr_enable);
+
+ ehci->next_statechange = jiffies + msecs_to_jiffies(10);
+ spin_unlock_irq(&ehci->lock);
+
+ /* ehci_work() may have re-enabled the watchdog timer, which we do not
+ * want, and so we must delete any pending watchdog timer events.
+ */
+ del_timer_sync(&ehci->watchdog);
+ return 0;
+}
+
+
+/* caller has locked the root hub, and should reset/reinit on error */
+static int fusbh200_ehci_bus_resume(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ u32 temp;
+ u32 power_okay;
+ int i;
+ unsigned long resume_needed = 0;
+
+ if (time_before(jiffies, ehci->next_statechange))
+ msleep(5);
+ spin_lock_irq(&ehci->lock);
+ if (!HCD_HW_ACCESSIBLE(hcd)) {
+ spin_unlock_irq(&ehci->lock);
+ return -ESHUTDOWN;
+ }
+
+ if (unlikely(ehci->debug)) {
+ if (!dbgp_reset_prep())
+ ehci->debug = NULL;
+ else
+ dbgp_external_startup();
+ }
+
+ /* Ideally and we've got a real resume here, and no port's power
+ * was lost. (For PCI, that means Vaux was maintained.) But we
+ * could instead be restoring a swsusp snapshot -- so that BIOS was
+ * the last user of the controller, not reset/pm hardware keeping
+ * state we gave to it.
+ */
+ power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
+ ehci_dbg(ehci, "resume root hub%s\n",
+ power_okay ? "" : " after power loss");
+
+ /* at least some APM implementations will try to deliver
+ * IRQs right away, so delay them until we're ready.
+ */
+ ehci_writel(ehci, 0, &ehci->regs->intr_enable);
+
+ /* re-init operational registers */
+ ehci_writel(ehci, 0, &ehci->regs->segment);
+ ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
+ ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
+
+ /* restore CMD_RUN, framelist size, and irq threshold */
+ ehci_writel(ehci, ehci->command, &ehci->regs->command);
+ ehci->rh_state = EHCI_RH_RUNNING;
+
+ /* Some controller/firmware combinations need a delay during which
+ * they set up the port statuses. See Bugzilla #8190. */
+ spin_unlock_irq(&ehci->lock);
+ msleep(8);
+ spin_lock_irq(&ehci->lock);
+
+ /* clear phy low-power mode before resume */
+ if (ehci->bus_suspended && ehci->has_hostpc) {
+ i = HCS_N_PORTS(ehci->hcs_params);
+ while (i--) {
+ if (test_bit(i, &ehci->bus_suspended)) {
+ u32 __iomem *hostpc_reg;
+
+ hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
+ + HOSTPC0 + 4 * i);
+ temp = ehci_readl(ehci, hostpc_reg);
+ ehci_writel(ehci, temp & ~HOSTPC_PHCD,
+ hostpc_reg);
+ }
+ }
+ spin_unlock_irq(&ehci->lock);
+ msleep(5);
+ spin_lock_irq(&ehci->lock);
+ }
+
+ /* manually resume the ports we suspended during bus_suspend() */
+ i = HCS_N_PORTS(ehci->hcs_params);
+ while (i--) {
+ temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
+ temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
+ if (test_bit(i, &ehci->bus_suspended) &&
+ (temp & PORT_SUSPEND)) {
+ temp |= PORT_RESUME;
+ set_bit(i, &resume_needed);
+ }
+ ehci_writel(ehci, temp, &ehci->regs->port_status[i]);
+ }
+
+ /* msleep for 20ms only if code is trying to resume port */
+ if (resume_needed) {
+ spin_unlock_irq(&ehci->lock);
+ msleep(20);
+ spin_lock_irq(&ehci->lock);
+ }
+
+ i = HCS_N_PORTS(ehci->hcs_params);
+ while (i--) {
+ temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
+ if (test_bit(i, &resume_needed)) {
+ temp &= ~(PORT_RWC_BITS | PORT_RESUME);
+ ehci_writel(ehci, temp, &ehci->regs->port_status[i]);
+ ehci_vdbg(ehci, "resumed port %d\n", i + 1);
+ }
+ }
+ (void) ehci_readl(ehci, &ehci->regs->command);
+
+ /* maybe re-activate the schedule(s) */
+ temp = 0;
+ if (ehci->async->qh_next.qh)
+ temp |= CMD_ASE;
+ if (ehci->periodic_sched)
+ temp |= CMD_PSE;
+ if (temp) {
+ ehci->command |= temp;
+ ehci_writel(ehci, ehci->command, &ehci->regs->command);
+ }
+
+ ehci->next_statechange = jiffies + msecs_to_jiffies(5);
+
+ /* Now we can safely re-enable irqs */
+ ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
+
+ spin_unlock_irq(&ehci->lock);
+ ehci_handover_companion_ports(ehci);
+ return 0;
+}
+
+#else
+
+#define fusbh200_ehci_bus_suspend NULL
+#define fusbh200_ehci_bus_resume NULL
+
+#endif /* CONFIG_PM */
+
+static void fusbh200_ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
+{
+ return;
+}
+
+static int fusbh200_ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
+{
+ return 0;
+}
+
+/*
+ * non-error returns are a promise to giveback() the urb later
+ * we drop ownership so next owner (or urb unlink) can get it
+ *
+ * urb + dev is in hcd.self.controller.urb_list
+ * we're queueing TDs onto software and hardware lists
+ *
+ * hcd-specific init for hcpriv hasn't been done yet
+ *
+ * NOTE: control, bulk, and interrupt share the same code to append TDs
+ * to a (possibly active) QH, and the same QH scanning code.
+ */
+static int fusbh200_ehci_urb_enqueue(
+ struct usb_hcd *hcd,
+ struct urb *urb,
+ gfp_t mem_flags
+) {
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ struct list_head qtd_list;
+
+ INIT_LIST_HEAD(&qtd_list);
+ switch (usb_pipetype(urb->pipe)) {
+ case PIPE_CONTROL:
+ /* qh_completions() code doesn't handle all the fault cases
+ * in multi-TD control transfers. Even 1KB is rare anyway.
+ */
+ if (urb->transfer_buffer_length > (16 * 1024))
+ return -EMSGSIZE;
+ /* FALLTHROUGH */
+ /* case PIPE_BULK: */
+ default:
+ if (!qh_urb_transaction(ehci, urb, &qtd_list, mem_flags))
+ return -ENOMEM;
+ return submit_async(ehci, urb, &qtd_list, mem_flags);
+
+ case PIPE_INTERRUPT:
+ if (!qh_urb_transaction(ehci, urb, &qtd_list, mem_flags))
+ return -ENOMEM;
+ return intr_submit(ehci, urb, &qtd_list, mem_flags);
+
+ case PIPE_ISOCHRONOUS:
+ return itd_submit(ehci, urb, mem_flags);
+ }
+}
+
+static void unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+ /* failfast */
+ if (ehci->rh_state != EHCI_RH_RUNNING && ehci->reclaim)
+ end_unlink_async(ehci);
+
+ /* If the QH isn't linked then there's nothing we can do
+ * unless we were called during a giveback, in which case
+ * qh_completions() has to deal with it.
+ */
+ if (qh->qh_state != QH_STATE_LINKED) {
+ if (qh->qh_state == QH_STATE_COMPLETING)
+ qh->needs_rescan = 1;
+ return;
+ }
+
+ /* defer till later if busy */
+ if (ehci->reclaim) {
+ struct ehci_qh *last;
+
+ for (last = ehci->reclaim;
+ last->reclaim;
+ last = last->reclaim)
+ continue;
+ qh->qh_state = QH_STATE_UNLINK_WAIT;
+ last->reclaim = qh;
+
+ /* start IAA cycle */
+ } else
+ start_unlink_async(ehci, qh);
+}
+
+/* remove from hardware lists
+ * completions normally happen asynchronously
+ */
+
+static int fusbh200_ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ struct ehci_qh *qh;
+ unsigned long flags;
+ int rc;
+ spin_lock_irqsave(&ehci->lock, flags);
+ rc = usb_hcd_check_unlink_urb(hcd, urb, status);
+ if (rc)
+ goto done;
+
+ switch (usb_pipetype(urb->pipe)) {
+ default:
+ qh = (struct ehci_qh *) urb->hcpriv;
+ if (!qh)
+ break;
+ switch (qh->qh_state) {
+ case QH_STATE_LINKED:
+ case QH_STATE_COMPLETING:
+ unlink_async(ehci, qh);
+ break;
+ case QH_STATE_UNLINK:
+ case QH_STATE_UNLINK_WAIT:
+ /* already started */
+ break;
+ case QH_STATE_IDLE:
+ /* QH might be waiting for a Clear-TT-Buffer */
+ qh_completions(ehci, qh);
+ break;
+ }
+ break;
+
+ case PIPE_INTERRUPT:
+ qh = (struct ehci_qh *) urb->hcpriv;
+ if (!qh)
+ break;
+ switch (qh->qh_state) {
+ case QH_STATE_LINKED:
+ case QH_STATE_COMPLETING:
+ intr_deschedule(ehci, qh);
+ break;
+ case QH_STATE_IDLE:
+ qh_completions(ehci, qh);
+ break;
+ default:
+ ehci_dbg(ehci, "bogus qh %p state %d\n",
+ qh, qh->qh_state);
+ goto done;
+ }
+ break;
+
+ case PIPE_ISOCHRONOUS:
+ /* itd or sitd ...
+ wait till next completion, do it then.
+ completion irqs can wait up to 1024 msec,
+ */
+ break;
+ }
+done:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ return rc;
+}
+
+struct hc_driver ehci_fusbh200_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "Faraday USB2.0 Host Controller",
+ .hcd_priv_size = sizeof(struct ehci_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+ .irq = fusbh200_ehci_irq,
+ .flags = HCD_MEMORY | HCD_USB2,
+
+ /*
+ * basic lifecycle operations
+ */
+ .reset = fusbh200_ehci_init,
+ .start = fusbh200_ehci_run,
+ .stop = fusbh200_ehci_stop,
+ .shutdown = fusbh200_ehci_shutdown,
+
+ /*
+ * managing i/o requests and associated device resources
+ */
+ .urb_enqueue = fusbh200_ehci_urb_enqueue,
+ .urb_dequeue = fusbh200_ehci_urb_dequeue,
+ .endpoint_disable = fusbh200_ehci_endpoint_disable,
+ .endpoint_reset = fusbh200_ehci_endpoint_reset,
+
+ /*
+ * scheduling support
+ */
+ .get_frame_number = fusbh200_ehci_get_frame,
+
+ /*
+ * root hub support
+ */
+ .hub_status_data = fusbh200_ehci_hub_status_data,
+ .hub_control = fusbh200_ehci_hub_control,
+ .bus_suspend = fusbh200_ehci_bus_suspend,
+ .bus_resume = fusbh200_ehci_bus_resume,
+
+ .relinquish_port = fusbh200_ehci_relinquish_port,
+ .port_handed_over = fusbh200_ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = fusbh200_ehci_clear_tt_buffer_complete,
+};
+
+void fusbh200_init(u32 addr)
+{
+ u32 reg;
+
+ reg = ioread32((const volatile void __iomem*)(addr + FUSBH200_BMCSR));
+ reg |= FUSBH200_BMCSR_INT_POLARITY;
+ iowrite32(reg, (volatile void __iomem*)(addr + FUSBH200_BMCSR));
+
+ /*Important: If AHB clock is >=15Mhz and <= 30MHz,*/
+ /*please remark this line (Enable half speed)).*/
+ /*IF > 30Hz, Disable half speed*/
+ reg = ioread32((const volatile void __iomem*)(addr + FUSBH200_BMCSR));
+ reg &= ~FUSBH200_BMCSR_VBUS_OFF;
+ iowrite32(reg, (volatile void __iomem*)(addr + FUSBH200_BMCSR));
+
+ reg = ioread32((const volatile void __iomem*)(addr + FUSBH200_BMIER));
+ reg |= FUSBH200_BMIER_OVC_EN | FUSBH200_BMIER_VBUS_ERR_EN;
+ iowrite32(reg, (volatile void __iomem*)(addr + FUSBH200_BMIER));
+}
+
+/**
+ * ehci_hcd_fusbh200_probe - initialize faraday fusbh200 HCDs
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it
+ * through the hotplug entry's driver_data.
+ */
+int ehci_hcd_fusbh200_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct usb_hcd *hcd;
+ struct resource *res;
+ int irq;
+ int retval = -ENODEV;
+ int result;
+ struct ehci_hcd *ehci;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ pdev->dev.power.power_state = PMSG_ON;
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res) {
+ dev_err(dev,
+ "Found HC with no IRQ. Check %s setup!\n",
+ dev_name(dev));
+ return -ENODEV;
+ }
+ irq = res->start;
+
+ hcd = usb_create_hcd(&ehci_fusbh200_hc_driver, dev,
+ dev_name(dev));
+ if (!hcd) {
+ dev_err(dev, "failed to create hcd with err %d\n", retval);
+ retval = -ENOMEM;
+ goto fail_create_hcd;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev,
+ "Found HC with no register addr. Check %s setup!\n",
+ dev_name(dev));
+ retval = -ENODEV;
+ goto fail_request_resource;
+ }
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
+ ehci_fusbh200_hc_driver.description)) {
+ dev_dbg(dev, "controller already in use\n");
+ retval = -EBUSY;
+ goto fail_request_resource;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res) {
+ dev_err(dev,
+ "Found HC with no register addr. Check %s setup!\n",
+ dev_name(dev));
+ retval = -ENODEV;
+ goto fail_request_resource;
+ }
+
+ hcd->regs = ioremap_nocache(res->start, resource_size(res));
+ if (hcd->regs == NULL) {
+ dev_dbg(dev, "error mapping memory\n");
+ retval = -EFAULT;
+ goto fail_ioremap;
+ }
+ /* initial HW setting for host and otg */
+ fusbh200_init((u32)hcd->regs);
+
+ ehci = hcd_to_ehci(hcd);
+
+ ehci->big_endian_mmio = 0;
+ ehci->caps = hcd->regs;
+ ehci->regs = hcd->regs
+ + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+
+ dbg_hcs_params(ehci, "reset");
+ dbg_hcc_params(ehci, "reset");
+
+ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+ result = fusbh200_ehci_halt(ehci);
+ if (result)
+ return result;
+
+ /* host include transaction-translator, will change speed to FS/LS */
+ hcd->has_tt = 1;
+ ehci->sbrn = 0x20;
+ ehci_port_power(ehci, 0);
+
+ retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (retval) {
+ dev_err(dev, "failed to add hcd with err %d\n", retval);
+ goto fail_add_hcd;
+ }
+
+ return retval;
+
+fail_add_hcd:
+ iounmap(hcd->regs);
+fail_ioremap:
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+fail_request_resource:
+ usb_put_hcd(hcd);
+fail_create_hcd:
+ dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval);
+ return retval;
+}
+
+/**
+ * ehci_hcd_fusbh200_remove - shutdown processing for EHCI HCDs
+ * @dev: USB Host Controller being removed
+ *
+ * Reverses the effect of fotg2xx_usb_hcd_probe(), first invoking
+ * the HCD's stop() method. It is always called from a thread
+ * context, normally "rmmod", "apmd", or something similar.
+ */
+int ehci_hcd_fusbh200_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+ if (!hcd)
+ return 0;
+
+ usb_remove_hcd(hcd);
+ iounmap(hcd->regs);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ usb_put_hcd(hcd);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+struct platform_driver ehci_hcd_fusbh200_driver = {
+ .driver = {
+ .name = "fusbh200",
+ },
+ .probe = ehci_hcd_fusbh200_probe,
+ .remove = ehci_hcd_fusbh200_remove,
+};
+
+static int __init ehci_hcd_init(void)
+{
+ int retval = 0;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
+ set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
+ if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
+ test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
+ printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
+ " before uhci_hcd and ohci_hcd, not after\n");
+
+ pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
+ hcd_name,
+ sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
+ sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
+
+#ifdef DEBUG
+ ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
+ if (!ehci_debug_root) {
+ retval = -ENOENT;
+ goto err_debug;
+ }
+#endif
+ retval = platform_driver_register(&ehci_hcd_fusbh200_driver);
+ if (retval < 0)
+ goto clean0;
+clean0:
+#ifdef DEBUG
+ debugfs_remove(ehci_debug_root);
+ ehci_debug_root = NULL;
+err_debug:
+#endif
+ clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
+ return retval;
+}
+module_init(ehci_hcd_init);
+
+static void __exit ehci_hcd_cleanup(void)
+{
+ platform_driver_unregister(&ehci_hcd_fusbh200_driver);
+#ifdef DEBUG
+ debugfs_remove(ehci_debug_root);
+#endif
+ clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
+}
+module_exit(ehci_hcd_cleanup);
diff --git a/drivers/usb/host/fusbh200.h b/drivers/usb/host/fusbh200.h
new file mode 100644
index 0000000..0fcf975
--- /dev/null
+++ b/drivers/usb/host/fusbh200.h
@@ -0,0 +1,907 @@
+/*
+ * Definition of EHCI
+ *
+ * Refer to ehci.h and ehci_def.h
+ *
+ * Copyright (c) 2001-2002 by David Brownell
+ *
+ * Definition of fotg210 by Faraday Tech.
+ *
+ * Copyright (c) 2012 by Yuan-Hsin Chen
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* definitions used for the EHCI driver */
+
+/*
+ * __hc32 and __hc16 are "Host Controller" types, they may be equivalent to
+ * __leXX (normally) or __beXX (given EHCI_BIG_ENDIAN_DESC), depending on
+ * the host controller implementation.
+ *
+ * To facilitate the strongest possible byte-order checking from "sparse"
+ * and so on, we use __leXX unless that's not practical.
+ */
+#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
+typedef __u32 __bitwise __hc32;
+typedef __u16 __bitwise __hc16;
+#else
+#define __hc32 __le32
+#define __hc16 __le16
+#endif
+
+/* statistics can be kept for tuning/monitoring */
+struct ehci_stats {
+ /* irq usage */
+ unsigned long normal;
+ unsigned long error;
+ unsigned long reclaim;
+ unsigned long lost_iaa;
+
+ /* termination of urbs from core */
+ unsigned long complete;
+ unsigned long unlink;
+};
+
+/* ehci_hcd->lock guards shared data against other CPUs:
+ * ehci_hcd: async, reclaim, periodic (and shadow), ...
+ * usb_host_endpoint: hcpriv
+ * ehci_qh: qh_next, qtd_list
+ * ehci_qtd: qtd_list
+ *
+ * Also, hold this lock when talking to HC registers or
+ * when updating hw_* fields in shared qh/qtd/... structures.
+ */
+
+#define EHCI_MAX_ROOT_PORTS 15 /* see HCS_N_PORTS */
+
+enum ehci_rh_state {
+ EHCI_RH_HALTED,
+ EHCI_RH_SUSPENDED,
+ EHCI_RH_RUNNING
+};
+
+struct ehci_hcd { /* one per controller */
+ /* glue to PCI and HCD framework */
+ struct ehci_caps __iomem *caps;
+ struct ehci_regs __iomem *regs;
+ struct ehci_dbg_port __iomem *debug;
+
+ __u32 hcs_params; /* cached register copy */
+ spinlock_t lock;
+ enum ehci_rh_state rh_state;
+
+ /* async schedule support */
+ struct ehci_qh *async;
+ struct ehci_qh *dummy; /* For AMD quirk use */
+ struct ehci_qh *reclaim;
+ struct ehci_qh *qh_scan_next;
+ unsigned scanning:1;
+
+ /* periodic schedule support */
+#define DEFAULT_I_TDPS 1024 /* some HCs can do less */
+ unsigned periodic_size;
+ __hc32 *periodic; /* hw periodic table */
+ dma_addr_t periodic_dma;
+ unsigned i_thresh; /* uframes HC might cache */
+
+ union ehci_shadow *pshadow; /* mirror hw periodic table */
+ int next_uframe; /* scan periodic, start here */
+ unsigned periodic_sched; /* periodic activity count */
+ unsigned uframe_periodic_max; /* max periodic time per uframe */
+
+
+ /* list of itds & sitds completed while clock_frame was still active */
+ struct list_head cached_itd_list;
+ struct list_head cached_sitd_list;
+ unsigned clock_frame;
+
+ /* per root hub port */
+ unsigned long reset_done[EHCI_MAX_ROOT_PORTS];
+
+ /* bit vectors (one bit per port) */
+ unsigned long bus_suspended; /* which ports were
+ already suspended at the start of a bus suspend */
+ unsigned long companion_ports; /* which ports are
+ dedicated to the companion controller */
+ unsigned long owned_ports; /* which ports are
+ owned by the companion during a bus suspend */
+ unsigned long port_c_suspend; /* which ports have
+ the change-suspend feature turned on */
+ unsigned long suspended_ports; /* which ports are
+ suspended */
+
+ /* per-HC memory pools (could be per-bus, but ...) */
+ struct dma_pool *qh_pool; /* qh per active urb */
+ struct dma_pool *qtd_pool; /* one or more per qh */
+ struct dma_pool *itd_pool; /* itd per iso urb */
+ struct dma_pool *sitd_pool; /* sitd per split iso urb */
+
+ struct timer_list iaa_watchdog;
+ struct timer_list watchdog;
+ unsigned long actions;
+ unsigned periodic_stamp;
+ unsigned random_frame;
+ unsigned long next_statechange;
+ ktime_t last_periodic_enable;
+ u32 command;
+
+ /* SILICON QUIRKS */
+ unsigned no_selective_suspend:1;
+ unsigned has_fsl_port_bug:1; /* FreeScale */
+ unsigned big_endian_mmio:1;
+ unsigned big_endian_desc:1;
+ unsigned big_endian_capbase:1;
+ unsigned has_amcc_usb23:1;
+ unsigned need_io_watchdog:1;
+ unsigned broken_periodic:1;
+ unsigned amd_pll_fix:1;
+ unsigned fs_i_thresh:1; /* Intel iso scheduling */
+ unsigned use_dummy_qh:1; /* AMD Frame List table quirk*/
+ unsigned has_synopsys_hc_bug:1; /* Synopsys HC */
+ unsigned frame_index_bug:1; /* MosChip (AKA NetMos) */
+
+ /* required for usb32 quirk */
+ #define OHCI_CTRL_HCFS (3 << 6)
+ #define OHCI_USB_OPER (2 << 6)
+ #define OHCI_USB_SUSPEND (3 << 6)
+
+ #define OHCI_HCCTRL_OFFSET 0x4
+ #define OHCI_HCCTRL_LEN 0x4
+ __hc32 *ohci_hcctrl_reg;
+ unsigned has_hostpc:1;
+ unsigned has_lpm:1; /* support link power management */
+ unsigned has_ppcd:1; /* support per-port change bits */
+ u8 sbrn; /* packed release number */
+
+ /* irq statistics */
+#ifdef EHCI_STATS
+ struct ehci_stats stats;
+# define COUNT(x) do { (x)++; } while (0)
+#else
+# define COUNT(x) do {} while (0)
+#endif
+
+ /* debug files */
+#ifdef DEBUG
+ struct dentry *debug_dir;
+#endif
+ /*
+ * OTG controllers and transceivers need software interaction
+ */
+ struct otg_transceiver *transceiver;
+};
+
+/* convert between an HCD pointer and the corresponding EHCI_HCD */
+static inline struct ehci_hcd *hcd_to_ehci(struct usb_hcd *hcd)
+{
+ return (struct ehci_hcd *)(hcd->hcd_priv);
+}
+static inline struct usb_hcd *ehci_to_hcd(struct ehci_hcd *ehci)
+{
+ return container_of((void *) ehci, struct usb_hcd, hcd_priv);
+}
+
+
+static inline void
+iaa_watchdog_start(struct ehci_hcd *ehci)
+{
+ WARN_ON(timer_pending(&ehci->iaa_watchdog));
+ mod_timer(&ehci->iaa_watchdog,
+ jiffies + msecs_to_jiffies(EHCI_IAA_MSECS));
+}
+
+static inline void iaa_watchdog_done(struct ehci_hcd *ehci)
+{
+ del_timer(&ehci->iaa_watchdog);
+}
+
+enum ehci_timer_action {
+ TIMER_IO_WATCHDOG,
+ TIMER_ASYNC_SHRINK,
+ TIMER_ASYNC_OFF,
+};
+
+static inline void
+timer_action_done(struct ehci_hcd *ehci, enum ehci_timer_action action)
+{
+ clear_bit(action, &ehci->actions);
+}
+
+static void free_cached_lists(struct ehci_hcd *ehci);
+
+#define QTD_NEXT(ehci, dma) cpu_to_hc32(ehci, (u32)dma)
+
+/*
+ * EHCI Specification 0.95 Section 3.5
+ * QTD: describe data transfer components (buffer, direction, ...)
+ * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".
+ *
+ * These are associated only with "QH" (Queue Head) structures,
+ * used with control, bulk, and interrupt transfers.
+ */
+struct ehci_qtd {
+ /* first part defined by EHCI spec */
+ __hc32 hw_next; /* see EHCI 3.5.1 */
+ __hc32 hw_alt_next; /* see EHCI 3.5.2 */
+ __hc32 hw_token; /* see EHCI 3.5.3 */
+#define QTD_TOGGLE (1 << 31) /* data toggle */
+#define QTD_LENGTH(tok) (((tok)>>16) & 0x7fff)
+#define QTD_IOC (1 << 15) /* interrupt on complete */
+#define QTD_CERR(tok) (((tok)>>10) & 0x3)
+#define QTD_PID(tok) (((tok)>>8) & 0x3)
+#define QTD_STS_ACTIVE (1 << 7) /* HC may execute this */
+#define QTD_STS_HALT (1 << 6) /* halted on error */
+#define QTD_STS_DBE (1 << 5) /* data buffer error (in HC) */
+#define QTD_STS_BABBLE (1 << 4) /* device was babbling (qtd halted) */
+#define QTD_STS_XACT (1 << 3) /* device gave illegal response */
+#define QTD_STS_MMF (1 << 2) /* incomplete split transaction */
+#define QTD_STS_STS (1 << 1) /* split transaction state */
+#define QTD_STS_PING (1 << 0) /* issue PING? */
+
+#define ACTIVE_BIT(ehci) cpu_to_hc32(ehci, QTD_STS_ACTIVE)
+#define HALT_BIT(ehci) cpu_to_hc32(ehci, QTD_STS_HALT)
+#define STATUS_BIT(ehci) cpu_to_hc32(ehci, QTD_STS_STS)
+
+ __hc32 hw_buf[5]; /* see EHCI 3.5.4 */
+ __hc32 hw_buf_hi[5]; /* Appendix B */
+
+ /* the rest is HCD-private */
+ dma_addr_t qtd_dma; /* qtd address */
+ struct list_head qtd_list; /* sw qtd list */
+ struct urb *urb; /* qtd's urb */
+ size_t length; /* length of buffer */
+} __attribute__ ((aligned(32)));
+
+/* mask NakCnt+T in qh->hw_alt_next */
+#define QTD_MASK(ehci) (cpu_to_hc32(ehci, ~0x1f))
+
+#define IS_SHORT_READ(token) (QTD_LENGTH(token) != 0 && QTD_PID(token) == 1)
+
+/* type tag from {qh,itd,sitd,fstn}->hw_next */
+#define Q_NEXT_TYPE(ehci, dma) ((dma) & cpu_to_hc32(ehci, 3 << 1))
+
+/*
+ * Now the following defines are not converted using the
+ * cpu_to_le32() macro anymore, since we have to support
+ * "dynamic" switching between be and le support, so that the driver
+ * can be used on one system with SoC EHCI controller using big-endian
+ * descriptors as well as a normal little-endian PCI EHCI controller.
+ */
+/* values for that type tag */
+#define Q_TYPE_ITD (0 << 1)
+#define Q_TYPE_QH (1 << 1)
+#define Q_TYPE_SITD (2 << 1)
+#define Q_TYPE_FSTN (3 << 1)
+
+/* next async queue entry, or pointer to interrupt/periodic QH */
+#define QH_NEXT(ehci, dma) (cpu_to_hc32(ehci, (((u32)dma)&~0x01f)|Q_TYPE_QH))
+
+/* for periodic/async schedules and qtd lists, mark end of list */
+#define EHCI_LIST_END(ehci) cpu_to_hc32(ehci, 1) /* "null pointer" to hw */
+
+/*
+ * Entries in periodic shadow table are pointers to one of four kinds
+ * of data structure. That's dictated by the hardware; a type tag is
+ * encoded in the low bits of the hardware's periodic schedule. Use
+ * Q_NEXT_TYPE to get the tag.
+ *
+ * For entries in the async schedule, the type tag always says "qh".
+ */
+union ehci_shadow {
+ struct ehci_qh *qh; /* Q_TYPE_QH */
+ struct ehci_itd *itd; /* Q_TYPE_ITD */
+ struct ehci_sitd *sitd; /* Q_TYPE_SITD */
+ struct ehci_fstn *fstn; /* Q_TYPE_FSTN */
+ __hc32 *hw_next; /* (all types) */
+ void *ptr;
+};
+
+/*
+ * EHCI Specification 0.95 Section 3.6
+ * QH: describes control/bulk/interrupt endpoints
+ * See Fig 3-7 "Queue Head Structure Layout".
+ *
+ * These appear in both the async and (for interrupt) periodic schedules.
+ */
+
+/* first part defined by EHCI spec */
+struct ehci_qh_hw {
+ __hc32 hw_next; /* see EHCI 3.6.1 */
+ __hc32 hw_info1; /* see EHCI 3.6.2 */
+#define QH_HEAD 0x00008000
+ __hc32 hw_info2; /* see EHCI 3.6.2 */
+#define QH_SMASK 0x000000ff
+#define QH_CMASK 0x0000ff00
+#define QH_HUBADDR 0x007f0000
+#define QH_HUBPORT 0x3f800000
+#define QH_MULT 0xc0000000
+ __hc32 hw_current; /* qtd list - see EHCI 3.6.4 */
+
+ /* qtd overlay (hardware parts of a struct ehci_qtd) */
+ __hc32 hw_qtd_next;
+ __hc32 hw_alt_next;
+ __hc32 hw_token;
+ __hc32 hw_buf[5];
+ __hc32 hw_buf_hi[5];
+} __attribute__ ((aligned(32)));
+
+struct ehci_qh {
+ struct ehci_qh_hw *hw;
+ /* the rest is HCD-private */
+ dma_addr_t qh_dma; /* address of qh */
+ union ehci_shadow qh_next; /* ptr to qh; or periodic */
+ struct list_head qtd_list; /* sw qtd list */
+ struct ehci_qtd *dummy;
+ struct ehci_qh *reclaim; /* next to reclaim */
+
+ struct ehci_hcd *ehci;
+ unsigned long unlink_time;
+
+ /*
+ * Do NOT use atomic operations for QH refcounting. On some CPUs
+ * (PPC7448 for example), atomic operations cannot be performed on
+ * memory that is cache-inhibited (i.e. being used for DMA).
+ * Spinlocks are used to protect all QH fields.
+ */
+ u32 refcount;
+ unsigned stamp;
+
+ u8 needs_rescan; /* Dequeue during giveback */
+ u8 qh_state;
+#define QH_STATE_LINKED 1 /* HC sees this */
+#define QH_STATE_UNLINK 2 /* HC may still see this */
+#define QH_STATE_IDLE 3 /* HC doesn't see this */
+#define QH_STATE_UNLINK_WAIT 4 /* LINKED and on reclaim q */
+#define QH_STATE_COMPLETING 5 /* don't touch token.HALT */
+
+ u8 xacterrs; /* XactErr retry counter */
+#define QH_XACTERR_MAX 32 /* XactErr retry limit */
+
+ /* periodic schedule info */
+ u8 usecs; /* intr bandwidth */
+ u8 gap_uf; /* uframes split/csplit gap */
+ u8 c_usecs; /* ... split completion bw */
+ u16 tt_usecs; /* tt downstream bandwidth */
+ unsigned short period; /* polling interval */
+ unsigned short start; /* where polling starts */
+#define NO_FRAME ((unsigned short)~0) /* pick new start */
+
+ struct usb_device *dev; /* access to TT */
+ unsigned is_out:1; /* bulk or intr OUT */
+ unsigned clearing_tt:1; /* Clear-TT-Buf in progress */
+};
+
+/* description of one iso transaction (up to 3 KB data if highspeed) */
+struct ehci_iso_packet {
+ /* These will be copied to iTD when scheduling */
+ u64 bufp; /* itd->hw_bufp{,_hi}[pg] |= */
+ __hc32 transaction; /* itd->hw_transaction[i] |= */
+ u8 cross; /* buf crosses pages */
+ /* for full speed OUT splits */
+ u32 buf1;
+};
+
+/* temporary schedule data for packets from iso urbs (both speeds)
+ * each packet is one logical usb transaction to the device (not TT),
+ * beginning at stream->next_uframe
+ */
+struct ehci_iso_sched {
+ struct list_head td_list;
+ unsigned span;
+ struct ehci_iso_packet packet[0];
+};
+
+/*
+ * ehci_iso_stream - groups all (s)itds for this endpoint.
+ * acts like a qh would, if EHCI had them for ISO.
+ */
+struct ehci_iso_stream {
+ /* first field matches ehci_hq, but is NULL */
+ struct ehci_qh_hw *hw;
+
+ u32 refcount;
+ u8 bEndpointAddress;
+ u8 highspeed;
+ struct list_head td_list; /* queued itds/sitds */
+ struct list_head free_list; /* list of unused itds/sitds */
+ struct usb_device *udev;
+ struct usb_host_endpoint *ep;
+
+ /* output of (re)scheduling */
+ int next_uframe;
+ __hc32 splits;
+
+ /* the rest is derived from the endpoint descriptor,
+ * trusting urb->interval == f(epdesc->bInterval) and
+ * including the extra info for hw_bufp[0..2]
+ */
+ u8 usecs, c_usecs;
+ u16 interval;
+ u16 tt_usecs;
+ u16 maxp;
+ u16 raw_mask;
+ unsigned bandwidth;
+
+ /* This is used to initialize iTD's hw_bufp fields */
+ __hc32 buf0;
+ __hc32 buf1;
+ __hc32 buf2;
+
+ /* this is used to initialize sITD's tt info */
+ __hc32 address;
+};
+
+/*
+ * EHCI Specification 0.95 Section 3.3
+ * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"
+ *
+ * Schedule records for high speed iso xfers
+ */
+struct ehci_itd {
+ /* first part defined by EHCI spec */
+ __hc32 hw_next; /* see EHCI 3.3.1 */
+ __hc32 hw_transaction[8]; /* see EHCI 3.3.2 */
+#define EHCI_ISOC_ACTIVE (1<<31) /* activate transfer this slot */
+#define EHCI_ISOC_BUF_ERR (1<<30) /* Data buffer error */
+#define EHCI_ISOC_BABBLE (1<<29) /* babble detected */
+#define EHCI_ISOC_XACTERR (1<<28) /* XactErr - transaction error */
+#define EHCI_ITD_LENGTH(tok) (((tok)>>16) & 0x0fff)
+#define EHCI_ITD_IOC (1 << 15) /* interrupt on complete */
+
+#define ITD_ACTIVE(ehci) cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE)
+
+ __hc32 hw_bufp[7]; /* see EHCI 3.3.3 */
+ __hc32 hw_bufp_hi[7]; /* Appendix B */
+
+ /* the rest is HCD-private */
+ dma_addr_t itd_dma; /* for this itd */
+ union ehci_shadow itd_next; /* ptr to periodic q entry */
+
+ struct urb *urb;
+ struct ehci_iso_stream *stream; /* endpoint's queue */
+ struct list_head itd_list; /* list of stream's itds */
+
+ /* any/all hw_transactions here may be used by that urb */
+ unsigned frame; /* where scheduled */
+ unsigned pg;
+ unsigned index[8]; /* in urb->iso_frame_desc */
+} __attribute__ ((aligned(64)));
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * EHCI Specification 0.95 Section 3.4
+ * siTD, aka split-transaction isochronous Transfer Descriptor
+ * ... describe full speed iso xfers through TT in hubs
+ * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)
+ */
+struct ehci_sitd {
+ /* first part defined by EHCI spec */
+ __hc32 hw_next;
+/* uses bit field macros above - see EHCI 0.95 Table 3-8 */
+ __hc32 hw_fullspeed_ep; /* EHCI table 3-9 */
+ __hc32 hw_uframe; /* EHCI table 3-10 */
+ __hc32 hw_results; /* EHCI table 3-11 */
+#define SITD_IOC (1 << 31) /* interrupt on completion */
+#define SITD_PAGE (1 << 30) /* buffer 0/1 */
+#define SITD_LENGTH(x) (0x3ff & ((x)>>16))
+#define SITD_STS_ACTIVE (1 << 7) /* HC may execute this */
+#define SITD_STS_ERR (1 << 6) /* error from TT */
+#define SITD_STS_DBE (1 << 5) /* data buffer error (in HC) */
+#define SITD_STS_BABBLE (1 << 4) /* device was babbling */
+#define SITD_STS_XACT (1 << 3) /* illegal IN response */
+#define SITD_STS_MMF (1 << 2) /* incomplete split transaction */
+#define SITD_STS_STS (1 << 1) /* split transaction state */
+
+#define SITD_ACTIVE(ehci) cpu_to_hc32(ehci, SITD_STS_ACTIVE)
+
+ __hc32 hw_buf[2]; /* EHCI table 3-12 */
+ __hc32 hw_backpointer; /* EHCI table 3-13 */
+ __hc32 hw_buf_hi[2]; /* Appendix B */
+
+ /* the rest is HCD-private */
+ dma_addr_t sitd_dma;
+ union ehci_shadow sitd_next; /* ptr to periodic q entry */
+
+ struct urb *urb;
+ struct ehci_iso_stream *stream; /* endpoint's queue */
+ struct list_head sitd_list; /* list of stream's sitds */
+ unsigned frame;
+ unsigned index;
+} __attribute__ ((aligned(32)));
+
+/*
+ * EHCI Specification 0.96 Section 3.7
+ * Periodic Frame Span Traversal Node (FSTN)
+ *
+ * Manages split interrupt transactions (using TT) that span frame boundaries
+ * into uframes 0/1; see 4.12.2.2. In those uframes, a "save place" FSTN
+ * makes the HC jump (back) to a QH to scan for fs/ls QH completions until
+ * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.
+ */
+struct ehci_fstn {
+ __hc32 hw_next; /* any periodic q entry */
+ __hc32 hw_prev; /* qh or EHCI_LIST_END */
+
+ /* the rest is HCD-private */
+ dma_addr_t fstn_dma;
+ union ehci_shadow fstn_next; /* ptr to periodic q entry */
+} __attribute__ ((aligned(32)));
+
+/* Prepare the PORTSC wakeup flags during controller suspend/resume */
+
+#define ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup) \
+ ehci_adjust_port_wakeup_flags(ehci, true, do_wakeup);
+
+#define ehci_prepare_ports_for_controller_resume(ehci) \
+ ehci_adjust_port_wakeup_flags(ehci, false, false);
+
+#ifdef CONFIG_PPC_83xx
+/* Some Freescale processors have an erratum in which the TT
+ * port number in the queue head was 0..N-1 instead of 1..N.
+ */
+#define ehci_has_fsl_portno_bug(e) ((e)->has_fsl_port_bug)
+#else
+#define ehci_has_fsl_portno_bug(e) (0)
+#endif
+
+/*
+ * While most USB host controllers implement their registers in
+ * little-endian format, a minority (celleb companion chip) implement
+ * them in big endian format.
+ *
+ * This attempts to support either format at compile time without a
+ * runtime penalty, or both formats with the additional overhead
+ * of checking a flag bit.
+ *
+ * ehci_big_endian_capbase is a special quirk for controllers that
+ * implement the HC capability registers as separate registers and not
+ * as fields of a 32-bit register.
+ */
+
+#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
+#define ehci_big_endian_mmio(e) ((e)->big_endian_mmio)
+#define ehci_big_endian_capbase(e) ((e)->big_endian_capbase)
+#else
+#define ehci_big_endian_mmio(e) 0
+#define ehci_big_endian_capbase(e) 0
+#endif
+
+/*
+ * Big-endian read/write functions are arch-specific.
+ * Other arches can be added if/when they're needed.
+ */
+#if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX)
+#define readl_be(addr) __raw_readl((__force unsigned *)addr)
+#define writel_be(val, addr) __raw_writel(val, (__force unsigned *)addr)
+#endif
+
+static inline unsigned int ehci_readl(const struct ehci_hcd *ehci,
+ __u32 __iomem *regs)
+{
+#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
+ return ehci_big_endian_mmio(ehci) ?
+ readl_be(regs) :
+ readl(regs);
+#else
+ return readl(regs);
+#endif
+}
+
+static inline void ehci_writel(const struct ehci_hcd *ehci,
+ const unsigned int val, __u32 __iomem *regs)
+{
+#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
+ ehci_big_endian_mmio(ehci) ?
+ writel_be(val, regs) :
+ writel(val, regs);
+#else
+ writel(val, regs);
+#endif
+}
+
+/*
+ * On certain ppc-44x SoC there is a HW issue, that could only worked around with
+ * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch.
+ * Other common bits are dependent on has_amcc_usb23 quirk flag.
+ */
+#ifdef CONFIG_44x
+static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
+{
+ u32 hc_control;
+
+ hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS);
+ if (operational)
+ hc_control |= OHCI_USB_OPER;
+ else
+ hc_control |= OHCI_USB_SUSPEND;
+
+ writel_be(hc_control, ehci->ohci_hcctrl_reg);
+ (void) readl_be(ehci->ohci_hcctrl_reg);
+}
+#else
+static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
+{ }
+#endif
+
+/*
+ * The AMCC 440EPx not only implements its EHCI registers in big-endian
+ * format, but also its DMA data structures (descriptors).
+ *
+ * EHCI controllers accessed through PCI work normally (little-endian
+ * everywhere), so we won't bother supporting a BE-only mode for now.
+ */
+/* cpu to ehci */
+static inline __hc32 cpu_to_hc32(const struct ehci_hcd *ehci, const u32 x)
+{
+ return cpu_to_le32(x);
+}
+
+/* ehci to cpu */
+static inline u32 hc32_to_cpu(const struct ehci_hcd *ehci, const __hc32 x)
+{
+ return le32_to_cpu(x);
+}
+
+static inline u32 hc32_to_cpup(const struct ehci_hcd *ehci, const __hc32 *x)
+{
+ return le32_to_cpup(x);
+}
+
+#ifndef DEBUG
+#define STUB_DEBUG_FILES
+#endif /* DEBUG */
+
+/* EHCI register interface, corresponds to EHCI Revision 0.95 specification */
+
+/* Section 2.2 Host Controller Capability Registers */
+struct ehci_caps {
+ /* these fields are specified as 8 and 16 bit registers,
+ * but some hosts can't perform 8 or 16 bit PCI accesses.
+ */
+ u32 hc_capbase;
+#define HC_LENGTH(p) ((p)&0x00ff) /* bits 7:0 */
+#define HC_VERSION(p) (((p)>>16)&0xffff) /* bits 31:16 */
+ u32 hcs_params; /* HCSPARAMS - offset 0x4 */
+#define HCS_DEBUG_PORT(p) (((p)>>20)&0xf) /* bits 23:20, debug port? */
+#define HCS_INDICATOR(p) ((p)&(1 << 16)) /* true: has port indicators */
+#define HCS_N_CC(p) (((p)>>12)&0xf) /* bits 15:12, #companion HCs */
+#define HCS_N_PCC(p) (((p)>>8)&0xf) /* bits 11:8, ports per CC */
+#define HCS_PORTROUTED(p) ((p)&(1 << 7)) /* true: port routing */
+#define HCS_PPC(p) ((p)&(1 << 4)) /* true: port power control */
+#define HCS_N_PORTS(p) (((p)>>0)&0xf) /* bits 3:0, ports on HC */
+
+ u32 hcc_params; /* HCCPARAMS - offset 0x8 */
+#define HCC_EXT_CAPS(p) (((p)>>8)&0xff) /* for pci extended caps */
+#define HCC_ISOC_CACHE(p) ((p)&(1 << 7)) /* true: can cache isoc frame */
+#define HCC_ISOC_THRES(p) (((p)>>4)&0x7) /* bits 6:4, uframes cached */
+#define HCC_CANPARK(p) ((p)&(1 << 2)) /* true: can park on async qh */
+#define HCC_PGM_FRAMELISTLEN(p) ((p)&(1 << 1)) /* true: periodic_size changes*/
+#define HCC_64BIT_ADDR(p) ((p)&(1)) /* true: can use 64-bit addr */
+ u8 portroute[8]; /* nibbles for routing - offset 0xC */
+} __attribute__ ((packed));
+
+/* Section 2.3 Host Controller Operational Registers */
+struct ehci_regs {
+
+ /* USBCMD: offset 0x00 */
+ u32 command;
+/* 23:16 is r/w intr rate, in microframes; default "8" == 1/msec */
+#define CMD_PARK (1<<11) /* enable "park" on async qh */
+#define CMD_PARK_CNT(c) (((c)>>8)&3) /* how many transfers to park for */
+#define CMD_LRESET (1<<7) /* partial reset (no ports, etc) */
+#define CMD_IAAD (1<<6) /* "doorbell" interrupt async advance */
+#define CMD_ASE (1<<5) /* async schedule enable */
+#define CMD_PSE (1<<4) /* periodic schedule enable */
+/* 3:2 is periodic frame list size */
+#define CMD_RESET (1<<1) /* reset HC not bus */
+#define CMD_RUN (1<<0) /* start/stop HC */
+
+ /* USBSTS: offset 0x04 */
+ u32 status;
+#define STS_ASS (1<<15) /* Async Schedule Status */
+#define STS_PSS (1<<14) /* Periodic Schedule Status */
+#define STS_RECL (1<<13) /* Reclamation */
+#define STS_HALT (1<<12) /* Not running (any reason) */
+/* some bits reserved */
+ /* these STS_* flags are also intr_enable bits (USBINTR) */
+#define STS_IAA (1<<5) /* Interrupted on async advance */
+#define STS_FATAL (1<<4) /* such as some PCI access errors */
+#define STS_FLR (1<<3) /* frame list rolled over */
+#define STS_PCD (1<<2) /* port change detect */
+#define STS_ERR (1<<1) /* "error" completion (overflow, ...) */
+#define STS_INT (1<<0) /* "normal" completion (short, ...) */
+
+ /* USBINTR: offset 0x08 */
+ u32 intr_enable;
+
+ /* FRINDEX: offset 0x0C */
+ u32 frame_index; /* current microframe number */
+ /* CTRLDSSEGMENT: offset 0x10 */
+ u32 segment; /* address bits 63:32 if needed */
+ /* PERIODICLISTBASE: offset 0x14 */
+ u32 frame_list; /* points to periodic list */
+ /* ASYNCLISTADDR: offset 0x18 */
+ u32 async_next; /* address of next async queue head */
+
+ /* missed on Faraday controller */
+ /* u32 reserved[9]; */
+
+ /* CONFIGFLAG: offset 0x40 */
+ u32 configured_flag;
+#define FLAG_CF (1<<0) /* true: we'll support "high speed" */
+
+ /* PORTSC: offset 0x20 (0x44) */
+ u32 port_status[0]; /* up to N_PORTS */
+/* 31:23 reserved */
+#define PORT_WKOC_E (1<<22) /* wake on overcurrent (enable) */
+#define PORT_WKDISC_E (1<<21) /* wake on disconnect (enable) */
+#define PORT_WKCONN_E (1<<20) /* wake on connect (enable) */
+/* 19:16 for port testing */
+#define PORT_TEST_PKT (0x4<<16) /* Port Test Control - packet test */
+#define PORT_LED_OFF (0<<14)
+#define PORT_LED_AMBER (1<<14)
+#define PORT_LED_GREEN (2<<14)
+#define PORT_LED_MASK (3<<14)
+#define PORT_OWNER (1<<13) /* true: companion hc owns this port */
+#define PORT_POWER (1<<12) /* true: has power (see PPC) */
+#define PORT_USB11(x) (((x)&(3<<10)) == (1<<10)) /* USB 1.1 device */
+/* 11:10 for detecting lowspeed devices (reset vs release ownership) */
+/* 9 reserved */
+#define PORT_RESET (1<<8) /* reset port */
+#define PORT_SUSPEND (1<<7) /* suspend port */
+#define PORT_RESUME (1<<6) /* resume it */
+#define PORT_OCC (1<<5) /* over current change */
+#define PORT_OC (1<<4) /* over current active */
+#define PORT_PEC (1<<3) /* port enable change */
+#define PORT_PE (1<<2) /* port enable */
+#define PORT_CSC (1<<1) /* connect status change */
+#define PORT_CONNECT (1<<0) /* device connected */
+#define PORT_RWC_BITS (PORT_CSC | PORT_PEC | PORT_OCC)
+} __attribute__ ((packed));
+
+#define USBMODE 0x68 /* USB Device mode */
+#define USBMODE_SDIS (1<<3) /* Stream disable */
+#define USBMODE_BE (1<<2) /* BE/LE endianness select */
+#define USBMODE_CM_HC (3<<0) /* host controller mode */
+#define USBMODE_CM_IDLE (0<<0) /* idle state */
+
+/* Moorestown has some non-standard registers, partially due to the fact that
+ * its EHCI controller has both TT and LPM support. HOSTPCx are extentions to
+ * PORTSCx
+ */
+#define HOSTPC0 0x84 /* HOSTPC extension */
+#define HOSTPC_PHCD (1<<22) /* Phy clock disable */
+#define HOSTPC_PSPD (3<<25) /* Port speed detection */
+#define USBMODE_EX 0xc8 /* USB Device mode extension */
+#define USBMODE_EX_VBPS (1<<5) /* VBus Power Select On */
+#define USBMODE_EX_HC (3<<0) /* host controller mode */
+#define TXFILLTUNING 0x24 /* TX FIFO Tuning register */
+#define TXFIFO_DEFAULT (8<<16) /* FIFO burst threshold 8 */
+
+/* Appendix C, Debug port ... intended for use with special "debug devices"
+ * that can help if there's no serial console. (nonstandard enumeration.)
+ */
+struct ehci_dbg_port {
+ u32 control;
+#define DBGP_OWNER (1<<30)
+#define DBGP_ENABLED (1<<28)
+#define DBGP_DONE (1<<16)
+#define DBGP_INUSE (1<<10)
+#define DBGP_ERRCODE(x) (((x)>>7)&0x07)
+# define DBGP_ERR_BAD 1
+# define DBGP_ERR_SIGNAL 2
+#define DBGP_ERROR (1<<6)
+#define DBGP_GO (1<<5)
+#define DBGP_OUT (1<<4)
+#define DBGP_LEN(x) (((x)>>0)&0x0f)
+ u32 pids;
+#define DBGP_PID_GET(x) (((x)>>16)&0xff)
+#define DBGP_PID_SET(data, tok) (((data)<<8)|(tok))
+ u32 data03;
+ u32 data47;
+ u32 address;
+#define DBGP_EPADDR(dev, ep) (((dev)<<8)|(ep))
+} __attribute__ ((packed));
+
+#ifdef CONFIG_EARLY_PRINTK_DBGP
+#include <linux/init.h>
+extern int __init early_dbgp_init(char *s);
+extern struct console early_dbgp_console;
+#endif /* CONFIG_EARLY_PRINTK_DBGP */
+
+#ifdef CONFIG_EARLY_PRINTK_DBGP
+/* Call backs from ehci host driver to ehci debug driver */
+extern int dbgp_external_startup(void);
+extern int dbgp_reset_prep(void);
+#else
+static inline int dbgp_reset_prep(void)
+{
+ return 1;
+}
+static inline int dbgp_external_startup(void)
+{
+ return -1;
+}
+#endif
+
+static inline unsigned ehci_read_frame_index(struct ehci_hcd *ehci)
+{
+ return ehci_readl(ehci, &ehci->regs->frame_index);
+}
+
+/* Bus Monitor Control/Status Register (Address = 40h) */
+#define FUSBH200_BMCSR 0x40
+#define FUSBH200_BMCSR_VBUS_FLT_SEL BIT(0)
+#define FUSBH200_BMCSR_HDISCON_FLT_SEL BIT(1)
+#define FUSBH200_BMCSR_HALF_SPEED BIT(2)
+#define FUSBH200_BMCSR_INT_POLARITY BIT(3)
+#define FUSBH200_BMCSR_VBUS_OFF BIT(4)
+#define FUSBH200_BMCSR_VBUS_VLD BIT(8)
+#define FUSBH200_BMCSR_HOST_SPD_TYP (BIT(9) | BIT(10))
+
+#ifdef CONFIG_711MA_PHY
+/* Cover 711MA PHY (Full speed reset issue) */
+#define mwH20_Control_COVER_FS_PHY_Reset_Set(base) REG_OR_WRITE(base, 0x40, BIT(12))
+#define mwH20_Control_COVER_FS_PHY_Reset_Clr(base) REG_CLR(base, 0x40, BIT(12))
+#endif
+
+/* Bus Monitor Interrupt Status Register (Address = 44h) */
+#define FUSBH200_BMISR 0x44
+#define FUSBH200_BMISR_VBUS_ERR BIT(0)
+#define FUSBH200_BMISR_OVC BIT(1)
+#define FUSBH200_BMISR_DPLGRMV BIT(2)
+#define FUSBH200_BMISR_DMA_CMPLT BIT(3)
+#define FUSBH200_BMISR_DMA_ERROR BIT(4)
+
+/* Bus Monitor Interrupt Enable Register (Address = 48h) */
+#define FUSBH200_BMIER 0x48
+#define FUSBH200_BMIER_DMA_ERROR_EN BIT(4)
+#define FUSBH200_BMIER_DMA_CMPLT_EN BIT(3)
+#define FUSBH200_BMIER_DPLGRMV_EN BIT(2)
+#define FUSBH200_BMIER_OVC_EN BIT(1)
+#define FUSBH200_BMIER_VBUS_ERR_EN BIT(0)
+
+/*
+ * Some EHCI controllers have a Transaction Translator built into the
+ * root hub. This is a non-standard feature. Each controller will need
+ * to add code to the following inline functions, and call them as
+ * needed (mostly in root hub code).
+ */
+
+#define ehci_is_TDI(e) (ehci_to_hcd(e)->has_tt)
+
+/* Returns the speed of a device attached to a port on the root hub. */
+static inline unsigned int
+ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
+{
+ u32 __iomem *reg_ptr;
+ u32 tmp;
+
+ reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->caps) +
+ FUSBH200_BMCSR);
+ tmp = readl(reg_ptr);
+ tmp = (tmp & FUSBH200_BMCSR_HOST_SPD_TYP) >> 9;
+
+ if (tmp == 2)
+ return USB_PORT_STAT_HIGH_SPEED;
+ else if (tmp == 1)
+ return USB_PORT_STAT_LOW_SPEED;
+ else if (tmp == 0)
+ return 0;
+ else
+ return USB_PORT_STAT_HIGH_SPEED;
+}
--
1.7.4.1
next reply other threads:[~2013-02-06 11:25 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-06 11:24 Yuan-Hsin Chen [this message]
2013-02-06 15:46 ` [PATCH] usb host: Faraday FUSBH200 HCD driver Alan Stern
2013-02-06 16:38 ` Felipe Balbi
2013-02-07 3:03 ` Yuan-Hsin Chen
2013-03-18 10:06 ` Yuan-Hsin Chen
2013-03-18 10:18 ` Felipe Balbi
2013-03-18 14:16 ` Alan Stern
2013-03-18 18:23 ` Felipe Balbi
2013-03-18 18:47 ` Alan Stern
2013-03-19 10:14 ` Yuan-Hsin Chen
2013-03-19 15:48 ` Alan Stern
2013-03-20 5:50 ` Yuan-Hsin Chen
2013-03-20 13:24 ` Yuan-Hsin Chen
2013-03-20 14:26 ` Alan Stern
2013-03-21 6:35 ` Yuan-Hsin Chen
2013-04-01 7:53 ` [PATCH v2] " Yuan-Hsin Chen
2013-04-16 12:43 ` [PATCH v3] usb host: Faraday USB2.0 FUSBH200-HCD driver Yuan-Hsin Chen
2013-04-26 9:37 ` [PATCH v4] " Yuan-Hsin Chen
2013-05-08 12:39 ` Yuan-Hsin Chen
2013-05-08 14:40 ` Alan Stern
2013-05-08 15:11 ` Yuan-Hsin Chen
2013-05-08 15:39 ` Greg KH
2013-05-17 0:45 ` Greg KH
2013-05-17 10:03 ` Yuan-Hsin Chen
2013-05-17 10:14 ` [PATCH v5] " Yuan-Hsin Chen
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