branch Attitude Adjustment

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 198 insertions, 0 deletions

diff --git a/target/linux/coldfire/patches/010-Add-SRAM-char-device-driver-support-for-MCF5445x.patch b/target/linux/coldfire/patches/010-Add-SRAM-char-device-driver-support-for-MCF5445x.patch
new file mode 100644
index 000000000..ed0516fcd
--- /dev/null
+++ b/target/linux/coldfire/patches/010-Add-SRAM-char-device-driver-support-for-MCF5445x.patch
@@ -0,0 +1,198 @@
+From f54ba59d355f59e4c01b5b9c7dbc2d27b47302d2 Mon Sep 17 00:00:00 2001
+From: Alison Wang <b18965@freescale.com>
+Date: Thu, 4 Aug 2011 09:59:41 +0800
+Subject: [PATCH 10/52] Add SRAM char device driver support for MCF5445x
+
+Created "/dev/sram" device file and implemented the sram mmap() operation to
+provide interface for userspace access.
+
+Signed-off-by: Alison Wang <b18965@freescale.com>
+---
+ drivers/char/Kconfig  |   11 ++++
+ drivers/char/Makefile |    2 +
+ drivers/char/sram.c   |  151 +++++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 164 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/char/sram.c
+
+--- a/drivers/char/Kconfig
++++ b/drivers/char/Kconfig
+@@ -97,6 +97,17 @@ config DEVKMEM
+ 	  kind of kernel debugging operations.
+ 	  When in doubt, say "N".
+ 
++config DEVSRAM
++	tristate "/dev/sram virtual device support"
++	depends on M5445X
++	default m
++	help
++	  Say Y here if you want to suppot the SRAM char device. When in
++	  doubt, say "N".
++
++	  It implements mmap system call to provide interface for
++	  user space access.
++
+ config BFIN_JTAG_COMM
+ 	tristate "Blackfin JTAG Communication"
+ 	depends on BLACKFIN
+--- a/drivers/char/Makefile
++++ b/drivers/char/Makefile
+@@ -87,3 +87,5 @@ obj-$(CONFIG_RAMOOPS)		+= ramoops.o
+ 
+ obj-$(CONFIG_JS_RTC)		+= js-rtc.o
+ js-rtc-y = rtc.o
++
++obj-$(CONFIG_DEVSRAM)		+= sram.o
+--- /dev/null
++++ b/drivers/char/sram.c
+@@ -0,0 +1,151 @@
++/*
++ * linux/drivers/char/sram.c
++ *
++ * Copyright (C) 2009-2011 Freescale Semiconductor, Inc. All Rights Reserved.
++ * Author: Lanttor.Guo@freescale.com
++ *
++ * SRAM char device driver, implements mmap() system call to provide
++ * interface for user space access.
++ *
++ * 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.
++ */
++
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/init.h>
++#include <linux/kernel.h>
++#include <linux/slab.h>
++#include <linux/fs.h>
++#include <linux/errno.h>
++#include <linux/types.h>
++#include <linux/mm.h>
++#include <linux/kdev_t.h>
++#include <asm/page.h>
++#include <linux/cdev.h>
++#include <linux/device.h>
++
++MODULE_LICENSE("GPL");
++
++static struct class *sram_class;
++static int sram_major;
++static int sram_minor;
++static struct cdev sram_cdev;
++
++/*
++ * Set up the cdev structure for sram.
++ */
++static void sram_setup_cdev(struct cdev *dev, int minor,
++		const struct file_operations *fops)
++{
++	int err, devno = MKDEV(sram_major, minor);
++
++	cdev_init(dev, fops);
++	dev->owner = THIS_MODULE;
++	dev->ops = fops;
++	err = cdev_add(dev, devno, 1);
++	/* Fail gracefully if need be */
++	if (err)
++		printk(KERN_NOTICE "Error %d adding sram%d", err, minor);
++}
++
++static int sram_open(struct inode *inode, struct file *filp)
++{
++	filp->f_mapping->backing_dev_info = &directly_mappable_cdev_bdi;
++	return 0;
++}
++
++static int sram_release(struct inode *inode, struct file *filp)
++{
++	return 0;
++}
++
++void sram_vma_open(struct vm_area_struct *vma)
++{
++	printk(KERN_DEBUG "Sram VMA open, virt %lx, phys %lx\n",
++			   vma->vm_start,
++			   CONFIG_SRAM_BASE + (vma->vm_pgoff << PAGE_SHIFT));
++}
++
++void sram_vma_close(struct vm_area_struct *vma)
++{
++	printk(KERN_DEBUG "Sram VMA close.\n");
++}
++
++
++static struct vm_operations_struct sram_remap_vm_ops = {
++	.open =  sram_vma_open,
++	.close = sram_vma_close,
++};
++
++static int sram_remap_mmap(struct file *filp, struct vm_area_struct *vma)
++{
++	size_t size = vma->vm_end - vma->vm_start;
++
++	if (PAGE_ALIGN(size) > CONFIG_SRAM_SIZE) {
++		printk(KERN_ERR "required length exceed the size "
++		       "of physical sram (%x)\n", CONFIG_SRAM_SIZE);
++		return -EAGAIN;
++	}
++
++	if ((CONFIG_SRAM_BASE + (vma->vm_pgoff << PAGE_SHIFT) + size)
++	    > (CONFIG_SRAM_BASE + CONFIG_SRAM_SIZE)) {
++		printk(KERN_ERR "required sram range exceed the size "
++		       "of phisical sram\n");
++		return -EAGAIN;
++	}
++
++	if (remap_pfn_range(vma, vma->vm_start,
++			    (CONFIG_SRAM_BASE >> PAGE_SHIFT) + vma->vm_pgoff,
++			    size,
++			    vma->vm_page_prot)) {
++		printk(KERN_ERR "remap_pfn_range faile at %s()\n", __func__);
++		return -EAGAIN;
++	}
++
++	vma->vm_ops = &sram_remap_vm_ops;
++	return 0;
++}
++
++static const struct file_operations sram_ops = {
++	.owner   = THIS_MODULE,
++	.open    = sram_open,
++	.release = sram_release,
++	.mmap    = sram_remap_mmap,
++};
++
++static int __init sram_chrdev_init(void)
++{
++	int minor_devs = 1;
++	int result;
++	dev_t dev = 0;
++	sram_minor = 0;
++
++	result = alloc_chrdev_region(&dev, sram_minor, minor_devs, "sram");
++	sram_major = MAJOR(dev);
++	if (result < 0) {
++		printk(KERN_WARNING "sram: can't get major %d\n", sram_major);
++		return result;
++	}
++
++	sram_setup_cdev(&sram_cdev, 0, &sram_ops);
++
++	sram_class = class_create(THIS_MODULE, "sram");
++	device_create(sram_class, NULL, MKDEV(sram_major, sram_minor),
++		      NULL, "sram");
++
++	return 0;
++}
++
++static void sram_chrdev_cleanup(void)
++{
++	cdev_del(&sram_cdev);
++	device_destroy(sram_class, MKDEV(sram_major, sram_minor));
++	class_destroy(sram_class);
++	unregister_chrdev_region(MKDEV(sram_major, 0), 1);
++}
++
++module_init(sram_chrdev_init);
++module_exit(sram_chrdev_cleanup);