From: <Vineet.Gupta1@synopsys.com>
To: <linux-arch@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <tglx@linutronix.de>, <arnd@arndb.de>,
Vineet Gupta <Vineet.Gupta1@synopsys.com>
Subject: [RFC Patch v1 53/55] ARC: Hostlink Pseudo-Driver for Metaware Debugger
Date: Mon, 12 Nov 2012 17:19:11 +0530 [thread overview]
Message-ID: <1352720953-24321-23-git-send-email-vgupta@synopsys.com> (raw)
In-Reply-To: <1352720953-24321-1-git-send-email-vgupta@synopsys.com>
From: Vineet Gupta <vgupta@synopsys.com>
This allows ARC Target to do I/O to host in absence of any peripherals
whatsoever, assisted by Metaware Hostlink facility.
Further we have a FUSE based filesystem which makes us mount/access host
filesystem on target and do fops.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/arc/Kconfig | 9 +++
arch/arc/kernel/Makefile | 1 +
arch/arc/kernel/arc_hostlink.c | 114 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 124 insertions(+), 0 deletions(-)
create mode 100644 arch/arc/kernel/arc_hostlink.c
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 79e8f2f..4653070 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -394,6 +394,15 @@ config HZ
int "Timer Frequency"
default 100
+config ARC_METAWARE_HLINK
+ bool "Support for Metaware debugger assisted Host access"
+ default n
+ help
+ This options allows a Linux userland apps to directly access
+ host file system (open/creat/read/write etc) with help from
+ Metaware Debugger. This can come in handy for Linux-host communication
+ when there is no real usable peripheral such as EMAC.
+
menuconfig ARC_DBG
bool "ARC debugging"
default y
diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile
index a2b7493..ce14b45 100644
--- a/arch/arc/kernel/Makefile
+++ b/arch/arc/kernel/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_ARC_DW2_UNWIND) += unwind.o
obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_ARC_MISALIGN_ACCESS) += unaligned.o
obj-$(CONFIG_KGDB) += kgdb.o
+obj-$(CONFIG_ARC_METAWARE_HLINK) += arc_hostlink.o
obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o
CFLAGS_fpu.o += -mdpfp
diff --git a/arch/arc/kernel/arc_hostlink.c b/arch/arc/kernel/arc_hostlink.c
new file mode 100644
index 0000000..de3bc42
--- /dev/null
+++ b/arch/arc/kernel/arc_hostlink.c
@@ -0,0 +1,114 @@
+/*
+ * arc_hostlink.c: Pseudo-driver for Metaware provided "hostlink" facility
+ *
+ * Allows Linux userland access to host in absence of any peripherals.
+ *
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/fs.h> /* file_operations */
+#include <linux/device.h> /* class_create */
+#include <linux/cdev.h> /* cdev */
+#include <linux/mm.h> /* VM_IO */
+#include <linux/module.h>
+#include <linux/uaccess.h>
+
+static unsigned char __HOSTLINK__[4 * PAGE_SIZE] __aligned(PAGE_SIZE);
+
+static int arc_hl_mmap(struct file *fp, struct vm_area_struct *vma);
+static long arc_hl_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
+
+static const struct file_operations arc_hl_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = arc_hl_ioctl,
+ .mmap = arc_hl_mmap,
+};
+
+static int arc_hl_major;
+static int arc_hl_minor;
+static int arc_hl_nr_devs = 1;
+static const char arc_hl_devnm[] = "hostlink";
+static struct cdev arc_hl_cdev;
+static struct class *arc_hl_class;
+
+static int __init arc_hl_linux_glue(void)
+{
+ dev_t arc_hl_dev;
+ int i;
+
+ if (arc_hl_major) { /* Preallocated MAJOR */
+
+ arc_hl_dev = MKDEV(arc_hl_major, arc_hl_minor);
+ register_chrdev_region(arc_hl_dev, arc_hl_nr_devs,
+ arc_hl_devnm);
+ } else { /* allocates Major to devices */
+ alloc_chrdev_region(&arc_hl_dev, 0, arc_hl_nr_devs,
+ arc_hl_devnm);
+ arc_hl_major = MAJOR(arc_hl_dev);
+ }
+
+ /* Populate sysfs entries: creates /sys/class/ sub-node for device */
+
+ arc_hl_class = class_create(THIS_MODULE, arc_hl_devnm);
+
+ /* connect file ops with cdev */
+
+ cdev_init(&arc_hl_cdev, &arc_hl_fops);
+ arc_hl_cdev.owner = THIS_MODULE;
+
+ /* Connect major/minor number to cdev
+ * makes device available.
+ * device nodes created with 'mknod` are probably already active.
+ */
+
+ cdev_add(&arc_hl_cdev, arc_hl_dev, arc_hl_nr_devs);
+
+ /* creates /sys/devices/virtual/<dev_name>/<names[i]> node with
+ * link from/sys/class/<dev_name>, needed by mdev.
+ */
+
+ for (i = 0; i < arc_hl_nr_devs; i++)
+ device_create(arc_hl_class, NULL, MKDEV(MAJOR(arc_hl_dev), i),
+ NULL, arc_hl_devnm);
+
+ pr_info("Hostlink dev to mknod is %d:%d\n",
+ arc_hl_major, arc_hl_minor);
+ return 0;
+}
+
+static int __init arc_hl_init(void)
+{
+ arc_hl_linux_glue();
+
+ pr_info("Hlink buffer mmap @ 0x%p\n", __HOSTLINK__);
+
+ return 0;
+}
+
+static int arc_hl_mmap(struct file *fp, struct vm_area_struct *vma)
+{
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot)) {
+ pr_warn("Hostlink buffer mmap ERROR\n");
+ return -EAGAIN;
+ }
+ return 0;
+}
+
+static long arc_hl_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ /* we only support, returning the physical addr to mmap in user space */
+ put_user((unsigned int)__HOSTLINK__, (int __user *)arg);
+ return 0;
+}
+
+module_init(arc_hl_init);
--
1.7.4.1
next prev parent reply other threads:[~2012-11-12 11:52 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-12 11:48 [RFC Patch v1 00/55] Addons to Synopsys ARC Linux kernel Port Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 32/55] ARC: [optim] Cache "current" in Register r25 Vineet.Gupta1
2012-11-12 13:50 ` Arnd Bergmann
2012-11-15 10:22 ` Vineet Gupta
2012-11-12 11:48 ` [RFC Patch v1 33/55] ARC: ptrace support Vineet.Gupta1
2012-11-12 13:51 ` Arnd Bergmann
2012-11-15 10:24 ` Vineet Gupta
2012-11-15 11:56 ` Arnd Bergmann
2012-11-12 11:48 ` [RFC Patch v1 34/55] ARC: futex Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 35/55] ARC: oprofile support Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 36/55] ARC: ARCompact 2 levels IRQ (high/low priority) Handling Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 37/55] ARC: dynamic loadable module support Vineet.Gupta1
2012-11-12 13:53 ` Arnd Bergmann
2012-11-15 10:28 ` Vineet Gupta
2012-11-12 11:48 ` [RFC Patch v1 38/55] ARC: Low level event capture/logging Vineet.Gupta1
2012-11-12 13:55 ` Arnd Bergmann
2012-11-15 10:40 ` Vineet Gupta
2012-11-15 12:04 ` Arnd Bergmann
2012-12-20 6:22 ` Vineet Gupta
2012-11-12 11:48 ` [RFC Patch v1 39/55] ARC: kernel diagnostics: show_regs() etc Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 40/55] ARC: SMP support Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 41/55] ARC: dwarf2 stack unwinder Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 42/55] ARC: stacktracing APIs based on dw2 unwinder Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 43/55] ARC: disassembly (needed by kprobes/kgdb/unaligned-access-emul) Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 44/55] ARC: kprobes support Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 45/55] ARC: unaligned access emulation Vineet.Gupta1
2012-11-12 14:00 ` Arnd Bergmann
2012-12-20 6:59 ` Vineet Gupta
2012-12-20 10:30 ` Vineet Gupta
2012-12-20 10:34 ` Geert Uytterhoeven
[not found] ` <1356001898-2960-1-git-send-email-vgupta@synopsys.com>
2012-12-20 11:11 ` [PATCH] sysctl: convert arch specific unaligned access regulators to generic ones Vineet.Gupta1
2013-01-03 6:47 ` [RESEND PATCH] Convert IA64 sysctl to generic Vineet Gupta
2013-01-03 6:47 ` [RESEND PATCH] sysctl: Enable IA64 "ignore-unaligned-usertrap" to be used cross-arch Vineet Gupta
2013-01-08 23:43 ` Tony Luck
2013-01-09 14:14 ` Vineet Gupta
2013-01-09 14:36 ` [PATCH v2] " Vineet Gupta
2013-01-09 18:55 ` Tony Luck
2013-01-09 21:03 ` Eric W. Biederman
2013-01-10 4:13 ` Vineet Gupta
2013-01-03 6:59 ` [RESEND PATCH] Convert PARISC sysctl to be generic Vineet Gupta
2013-01-03 6:59 ` [RESEND PATCH] sysctl: Enable PARISC "unaligned-trap" to be used cross-arch Vineet Gupta
2013-01-15 22:03 ` Helge Deller
2012-12-20 8:08 ` [RFC Patch v1 45/55] ARC: unaligned access emulation Vineet Gupta
2012-12-20 8:51 ` Arnd Bergmann
2012-11-12 11:49 ` [RFC Patch v1 46/55] ARC: kgdb support Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 47/55] ARC: startup #2: Verbose Boot reporting / feature verification Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 48/55] ARC: [plat-arfpga] BVCI Latency Unit setup Vineet.Gupta1
2012-11-12 14:02 ` Arnd Bergmann
2013-01-17 5:08 ` Vineet Gupta
2012-11-12 11:49 ` [RFC Patch v1 49/55] perf, ARC: Enable building perf tools for ARC Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 50/55] ARC: perf support (software counters only) Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 51/55] modpost: Ignore ARC specific non-alloc section Vineet.Gupta1
2012-12-27 10:47 ` [RESEND PATCH] modpost: For ARC Port submission Vineet Gupta
2012-12-27 10:47 ` [PATCH] modpost: Ignore ARC specific non-alloc sections Vineet Gupta
2012-12-27 20:48 ` Sam Ravnborg
2012-12-28 4:42 ` Vineet Gupta
2013-01-02 0:49 ` Rusty Russell
2013-01-02 5:16 ` Vineet Gupta
2012-11-12 11:49 ` [RFC Patch v1 52/55] ARC: Support for single cycle Close Coupled Mem (CCM) Vineet.Gupta1
2012-11-12 14:10 ` Arnd Bergmann
2013-01-17 5:09 ` Vineet Gupta
2013-01-17 10:53 ` Arnd Bergmann
2012-11-12 11:49 ` Vineet.Gupta1 [this message]
2012-11-12 11:49 ` [RFC Patch v1 54/55] ARC: [plat-arcfpga] defconfig Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 55/55] ARC: Add self to MAINTAINERS Vineet.Gupta1
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