[U-Boot] [PATCH] ulpi: add generic ULPI functionality

* [U-Boot] [PATCH] ulpi: add generic ULPI functionality
@ 2011-11-05 20:50 Jana Rapava
  2011-11-05 21:37 ` Marek Vasut
                   ` (2 more replies)
  0 siblings, 3 replies; 29+ messages in thread
From: Jana Rapava @ 2011-11-05 20:50 UTC (permalink / raw)
  To: u-boot

Add generic functions for ULPI init and setting bits in 
ULPI registers. 

Signed-off-by: Jana Rapava <fermata7@gmail.com>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Remy Bohmer <linux@bohmer.net>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Igor Grinberg <grinberg@compulab.co.il>
---
 Makefile                         |    1 +
 drivers/usb/ulpi/Makefile        |   44 ++++++++++++++
 drivers/usb/ulpi/ulpi-viewport.c |   87 +++++++++++++++++++++++++++
 drivers/usb/ulpi/ulpi.c          |  123 ++++++++++++++++++++++++++++++++++++++
 include/usb/ulpi.h               |   16 +++++
 5 files changed, 271 insertions(+), 0 deletions(-)
 create mode 100644 drivers/usb/ulpi/Makefile
 create mode 100644 drivers/usb/ulpi/ulpi-viewport.c
 create mode 100644 drivers/usb/ulpi/ulpi.c

diff --git a/Makefile b/Makefile
index 571c3eb..a475cb9 100644
--- a/Makefile
+++ b/Makefile
@@ -283,6 +283,7 @@ LIBS += drivers/usb/gadget/libusb_gadget.o
 LIBS += drivers/usb/host/libusb_host.o
 LIBS += drivers/usb/musb/libusb_musb.o
 LIBS += drivers/usb/phy/libusb_phy.o
+LIBS += drivers/usb/ulpi/libusb_ulpi.o
 LIBS += drivers/video/libvideo.o
 LIBS += drivers/watchdog/libwatchdog.o
 LIBS += common/libcommon.o
diff --git a/drivers/usb/ulpi/Makefile b/drivers/usb/ulpi/Makefile
new file mode 100644
index 0000000..f7b6e20
--- /dev/null
+++ b/drivers/usb/ulpi/Makefile
@@ -0,0 +1,44 @@
+#
+# Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	:= $(obj)libusb_ulpi.o
+
+COBJS-$(CONFIG_USB_ULPI) += ulpi.o ulpi-viewport.o
+
+COBJS	:= $(COBJS-y)
+SRCS	:= $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+
+all:	$(LIB)
+
+$(LIB):	$(obj).depend $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/drivers/usb/ulpi/ulpi-viewport.c b/drivers/usb/ulpi/ulpi-viewport.c
new file mode 100644
index 0000000..a0c213e
--- /dev/null
+++ b/drivers/usb/ulpi/ulpi-viewport.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
+ * Based on:
+ * linux/drivers/usb/otg/ulpi_viewport.c
+ *
+ * Original Copyright follow:
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <watchdog.h>
+#include <asm/io.h>
+#include <usb/ulpi.h>
+#include <usb/ehci-fsl.h>
+
+/* ULPI viewport control bits */
+#define ULPI_WU		(1 << 31)
+#define ULPI_SS		(1 << 27)
+#define ULPI_RWRUN	(1 << 30)
+#define ULPI_RWCTRL	(1 << 29)
+
+#define ULPI_ADDR_SHIFT		16
+#define ulpi_write_mask(value)	((value) & 0xff)
+#define ulpi_read_mask(value)	(((value) >> 8) & 0xff)
+
+int ulpi_wait(struct usb_ehci *ehci, u32 ulpi_value, u32 ulpi_mask)
+{
+	int timeout = ULPI_TIMEOUT;
+	u32 tmp;
+
+	writel(ulpi_value, &ehci->ulpi_viewpoint);
+
+	/* Wait for the bits in ulpi_mask to become zero. */
+	while (--timeout) {
+		tmp = readl(&ehci->ulpi_viewpoint);
+		if (!(tmp & ulpi_mask))
+			break;
+		WATCHDOG_RESET();
+	}
+
+	return !timeout;
+}
+
+int ulpi_wakeup(struct usb_ehci *ehci)
+{
+	if (readl(&ehci->ulpi_viewpoint) & ULPI_SS)
+		return 0; /* already awake */
+	return ulpi_wait(ehci, ULPI_WU, ULPI_WU);
+}
+
+void ulpi_write(struct usb_ehci *ehci, u32 reg, u32 value)
+{
+	u32 tmp;
+	if (ulpi_wakeup(ehci)) {
+		printf("ULPI wakeup timed out\n");
+		return;
+	}
+
+	tmp = ulpi_wait(ehci, ULPI_RWRUN | ULPI_RWCTRL |
+		reg << ULPI_ADDR_SHIFT | ulpi_write_mask(value), ULPI_RWRUN);
+	if (tmp)
+		printf("ULPI write timed out\n");
+}
+
+u32 ulpi_read(struct usb_ehci *ehci, u32 reg)
+{
+	if (ulpi_wakeup(ehci)) {
+		printf("ULPI wakeup timed out\n");
+		return 0;
+	}
+
+	if (ulpi_wait(ehci, ULPI_RWRUN | reg << ULPI_ADDR_SHIFT, ULPI_RWRUN)) {
+		printf("ULPI read timed out\n");
+		return 0;
+	}
+
+	return ulpi_read_mask(readl(&ehci->ulpi_viewpoint));
+}
diff --git a/drivers/usb/ulpi/ulpi.c b/drivers/usb/ulpi/ulpi.c
new file mode 100644
index 0000000..b1c482a
--- /dev/null
+++ b/drivers/usb/ulpi/ulpi.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
+ * Based on:
+ * linux/drivers/usb/otg/ulpi.c
+ * Generic ULPI USB transceiver support
+ *
+ * Original Copyright follow:
+ * Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ * Based on sources from
+ *
+ *   Sascha Hauer <s.hauer@pengutronix.de>
+ *   Freescale Semiconductors
+ *
+ * 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 <usb/ulpi.h>
+#include <usb/ehci-fsl.h>
+#include <exports.h>
+
+#ifdef DEBUG
+#define debug(fmt, args...)	printf(fmt, ##args)
+#else
+#define debug(fmt, args...)
+#endif /* DEBUG */
+
+void ulpi_integrity_check(struct usb_ehci *ehci, struct ulpi_regs *ulpi)
+{
+	u32 tmp = 0;
+	int i;
+	for (i = 0; i < 2; i++) {
+		ulpi_write(ehci, (u32)&ulpi->scratch_write,
+			ULPI_TEST_VALUE << i);
+		tmp = ulpi_read(ehci, (u32)&ulpi->scratch_write);
+
+		if (tmp != (ULPI_TEST_VALUE << i)) {
+			printf("ULPI integrity check failed\n");
+			return;
+		}
+	}
+}
+
+/*
+ * This is a family of wrapper functions which sets bits in ULPI registers.
+ * Access mode could be WRITE, SET or CLEAR.
+ * For further informations see ULPI 1.1 specification.
+ */
+void ulpi_otg_ctrl_flags
+	(struct usb_ehci *ehci, struct ulpi_regs *ulpi, int access_mode, u32 flags)
+{
+	switch (access_mode) {
+	case WRITE:
+		ulpi_write(ehci, (u32)&ulpi->otg_ctrl_write, flags);
+		break;
+	case SET:
+		ulpi_write(ehci, (u32)&ulpi->otg_ctrl_set, flags);
+		break;
+	case CLEAR:
+		ulpi_write(ehci, (u32)&ulpi->otg_ctrl_clear, flags);
+		break;
+	}
+}
+
+void ulpi_function_ctrl_flags
+	(struct usb_ehci *ehci, struct ulpi_regs *ulpi, int access_mode, u32 flags)
+{
+	switch (access_mode) {
+	case WRITE:
+		ulpi_write(ehci, (u32)&ulpi->function_ctrl_write, flags);
+		break;
+	case SET:
+		ulpi_write(ehci, (u32)&ulpi->function_ctrl_set, flags);
+		break;
+	case CLEAR:
+		ulpi_write(ehci, (u32)&ulpi->function_ctrl_clear, flags);
+		break;
+	}
+}
+
+void ulpi_iface_ctrl_flags
+	(struct usb_ehci *ehci, struct ulpi_regs *ulpi, int access_mode, u32 flags)
+{
+	switch (access_mode) {
+	case WRITE:
+		ulpi_write(ehci, (u32)&ulpi->iface_ctrl_write, flags);
+		break;
+	case SET:
+		ulpi_write(ehci, (u32)&ulpi->iface_ctrl_set, flags);
+		break;
+	case CLEAR:
+		ulpi_write(ehci, (u32)&ulpi->iface_ctrl_clear, flags);
+		break;
+	}
+
+}
+
+void ulpi_init(struct usb_ehci *ehci, struct ulpi_regs *ulpi)
+{
+	u32 tmp = 0;
+	int reg;
+
+	/* Assemble ID from four ULPI ID registers (8 bits each). */
+	for (reg = ULPI_ID_REGS_COUNT - 1; reg >= 0; reg--)
+		tmp |= ulpi_read(ehci, reg) << (reg * 8);
+
+	/* Split ID into vendor and product ID. */
+	debug("Found ULPI TX, ID %04x:%04x\n", tmp >> 16, tmp & 0xffff);
+
+	ulpi_integrity_check(ehci, ulpi);
+}
diff --git a/include/usb/ulpi.h b/include/usb/ulpi.h
index 1519cc5..a8625a1 100644
--- a/include/usb/ulpi.h
+++ b/include/usb/ulpi.h
@@ -15,6 +15,8 @@
 #ifndef __USB_ULPI_H
 #define __USB_ULPI_H
 
+#include <usb/ehci-fsl.h>
+
 #define ULPI_ID_REGS_COUNT	4
 #define ULPI_TEST_VALUE		0x55
 #define ULPI_TIMEOUT		1000 /* some reasonable value */
@@ -25,6 +27,11 @@
 #define ULPI_RWRUN	(1 << 30)
 #define ULPI_RWCTRL	(1 << 29)
 
+/* ULPI access modes */
+#define WRITE	0x00
+#define SET	0x01
+#define CLEAR	0x02
+
 struct ulpi_regs {
 	/* Vendor ID and Product ID: 0x00 - 0x03 Read-only */
 	u8	vendor_id_low;
@@ -201,4 +208,13 @@ struct ulpi_regs {
 void ulpi_write(struct usb_ehci *ehci, u32 reg, u32 value);
 u32 ulpi_read(struct usb_ehci *ehci, u32 reg);
 
+void ulpi_init(struct usb_ehci *ehci, struct ulpi_regs *ulpi);
+
+void ulpi_otg_ctrl_flags
+	(struct usb_ehci *ehci, struct ulpi_regs *ulpi, int access_mode, u32 flags);
+void ulpi_function_ctrl_flags
+	(struct usb_ehci *ehci, struct ulpi_regs *ulpi, int access_mode, u32 flags);
+void ulpi_iface_ctrl_flags
+	(struct usb_ehci *ehci, struct ulpi_regs *ulpi, int access_mode, u32 flags);
+
 #endif /* __USB_ULPI_H */
-- 
1.7.6.3

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