add flash map driver

1 files changed, 433 insertions, 0 deletions

diff --git a/target/brcm/patches/flash-map.patch b/target/brcm/patches/flash-map.patch
new file mode 100644
index 000000000..49a9a69f5
--- /dev/null
+++ b/target/brcm/patches/flash-map.patch
@@ -0,0 +1,433 @@
+diff -Nur linux-2.6.34.orig/drivers/mtd/maps/bcm47xx-flash.c linux-2.6.34/drivers/mtd/maps/bcm47xx-flash.c
+--- linux-2.6.34.orig/drivers/mtd/maps/bcm47xx-flash.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.34/drivers/mtd/maps/bcm47xx-flash.c	2010-05-30 15:50:20.921614063 +0200
+@@ -0,0 +1,402 @@
++/*
++ *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
++ *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
++ *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
++ *
++ *  original functions for finding root filesystem from Mike Baker 
++ *
++ *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
++ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
++ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
++ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
++ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
++ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
++ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
++ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
++ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
++ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
++ *
++ *  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.
++ * 
++ *  Copyright 2001-2003, Broadcom Corporation
++ *  All Rights Reserved.
++ * 
++ *  THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
++ *  KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
++ *  SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
++ *  FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
++ *
++ *  Flash mapping for BCM947XX boards
++ */
++
++#include <linux/init.h>
++#include <linux/module.h>
++#include <linux/types.h>
++#include <linux/kernel.h>
++#include <linux/sched.h>
++#include <linux/wait.h>
++#include <linux/mtd/mtd.h>
++#include <linux/mtd/map.h>
++#ifdef CONFIG_MTD_PARTITIONS
++#include <linux/mtd/partitions.h>
++#endif
++#include <linux/crc32.h>
++#ifdef CONFIG_SSB
++#include <linux/ssb/ssb.h>
++#endif
++#include <asm/io.h>
++
++
++#define TRX_MAGIC	0x30524448	/* "HDR0" */
++#define TRX_VERSION	1
++#define TRX_MAX_LEN	0x3A0000
++#define TRX_NO_HEADER	1		/* Do not write TRX header */	
++#define TRX_GZ_FILES	0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
++#define TRX_MAX_OFFSET	3
++
++struct trx_header {
++	u32 magic;		/* "HDR0" */
++	u32 len;		/* Length of file including header */
++	u32 crc32;		/* 32-bit CRC from flag_version to end of file */
++	u32 flag_version;	/* 0:15 flags, 16:31 version */
++	u32 offsets[TRX_MAX_OFFSET];	/* Offsets of partitions from start of header */
++};
++
++#define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
++#define NVRAM_SPACE 0x8000
++#define WINDOW_ADDR 0x1fc00000
++#define WINDOW_SIZE 0x400000
++#define BUSWIDTH 2
++
++#ifdef CONFIG_SSB
++extern struct ssb_bus ssb_bcm47xx;
++#endif
++static struct mtd_info *bcm47xx_mtd;
++
++static void bcm47xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
++{
++	if (len==1) {
++		memcpy_fromio(to, map->virt + from, len);
++	} else {
++		int i;
++		u16 *dest = (u16 *) to;
++		u16 *src  = (u16 *) (map->virt + from);
++		for (i = 0; i < (len / 2); i++) {
++			dest[i] = src[i];
++		}
++		if (len & 1)
++			*((u8 *)dest+len-1) = src[i] & 0xff;
++	}
++}
++
++static struct map_info bcm47xx_map = {
++	name: "Physically mapped flash",
++	size: WINDOW_SIZE,
++	bankwidth: BUSWIDTH,
++	phys: WINDOW_ADDR,
++};
++
++#ifdef CONFIG_MTD_PARTITIONS
++
++static struct mtd_partition bcm47xx_parts[] = {
++	{ name: "cfe",	offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
++	{ name: "linux", offset: 0, size: 0, },
++	{ name: "rootfs", offset: 0, size: 0, },
++	{ name: "nvram", offset: 0, size: 0, },
++	{ name: NULL, },
++};
++
++static int __init
++find_cfe_size(struct mtd_info *mtd, size_t size)
++{
++	struct trx_header *trx;
++	unsigned char buf[512];
++	int off;
++	size_t len;
++	int blocksize;
++
++	trx = (struct trx_header *) buf;
++
++	blocksize = mtd->erasesize;
++	if (blocksize < 0x10000)
++		blocksize = 0x10000;
++
++	for (off = (128*1024); off < size; off += blocksize) {
++		memset(buf, 0xe5, sizeof(buf));
++
++		/*
++		 * Read into buffer 
++		 */
++		if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
++		    len != sizeof(buf))
++			continue;
++
++		/* found a TRX header */
++		if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
++			goto found;
++		}
++	}
++
++	printk(KERN_NOTICE
++	       "%s: Couldn't find bootloader size\n",
++	       mtd->name);
++	return -1;
++
++ found:
++	printk(KERN_NOTICE "bootloader size: %d\n", off);
++	return off;
++
++}
++
++/*
++ * Copied from mtdblock.c
++ *
++ * Cache stuff...
++ * 
++ * Since typical flash erasable sectors are much larger than what Linux's
++ * buffer cache can handle, we must implement read-modify-write on flash
++ * sectors for each block write requests.  To avoid over-erasing flash sectors
++ * and to speed things up, we locally cache a whole flash sector while it is
++ * being written to until a different sector is required.
++ */
++
++static void erase_callback(struct erase_info *done)
++{
++	wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
++	wake_up(wait_q);
++}
++
++static int erase_write (struct mtd_info *mtd, unsigned long pos, 
++			int len, const char *buf)
++{
++	struct erase_info erase;
++	DECLARE_WAITQUEUE(wait, current);
++	wait_queue_head_t wait_q;
++	size_t retlen;
++	int ret;
++
++	/*
++	 * First, let's erase the flash block.
++	 */
++
++	init_waitqueue_head(&wait_q);
++	erase.mtd = mtd;
++	erase.callback = erase_callback;
++	erase.addr = pos;
++	erase.len = len;
++	erase.priv = (u_long)&wait_q;
++
++	set_current_state(TASK_INTERRUPTIBLE);
++	add_wait_queue(&wait_q, &wait);
++
++	ret = mtd->erase(mtd, &erase);
++	if (ret) {
++		set_current_state(TASK_RUNNING);
++		remove_wait_queue(&wait_q, &wait);
++		printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
++				     "on \"%s\" failed\n",
++			pos, len, mtd->name);
++		return ret;
++	}
++
++	schedule();  /* Wait for erase to finish. */
++	remove_wait_queue(&wait_q, &wait);
++
++	/*
++	 * Next, writhe data to flash.
++	 */
++
++	ret = mtd->write (mtd, pos, len, &retlen, buf);
++	if (ret)
++		return ret;
++	if (retlen != len)
++		return -EIO;
++	return 0;
++}
++
++
++
++
++static int __init
++find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
++{
++	struct trx_header trx, *trx2;
++	unsigned char buf[512], *block;
++	int off, blocksize;
++	u32 i, crc = ~0;
++	size_t len;
++	struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
++
++	blocksize = mtd->erasesize;
++	if (blocksize < 0x10000)
++		blocksize = 0x10000;
++
++	for (off = (128*1024); off < size; off += blocksize) {
++		memset(&trx, 0xe5, sizeof(trx));
++
++		/*
++		 * Read into buffer 
++		 */
++		if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
++		    len != sizeof(trx))
++			continue;
++
++		/* found a TRX header */
++		if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
++			part->offset = le32_to_cpu(trx.offsets[2]) ? : 
++				le32_to_cpu(trx.offsets[1]);
++			part->size = le32_to_cpu(trx.len); 
++
++			part->size -= part->offset;
++			part->offset += off;
++
++			goto found;
++		}
++	}
++
++	printk(KERN_NOTICE
++	       "%s: Couldn't find root filesystem\n",
++	       mtd->name);
++	return -1;
++
++ found:
++	if (part->size == 0)
++		return 0;
++	
++	if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
++		return 0;
++
++	return part->size;
++}
++
++struct mtd_partition * __init
++init_mtd_partitions(struct mtd_info *mtd, size_t size)
++{
++	int cfe_size;
++
++	if ((cfe_size = find_cfe_size(mtd,size)) < 0)
++		return NULL;
++
++	/* boot loader */
++	bcm47xx_parts[0].offset = 0;
++	bcm47xx_parts[0].size   = cfe_size;
++
++	/* nvram */
++	if (cfe_size != 384 * 1024) {
++		bcm47xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
++		bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
++	} else {
++		/* nvram (old 128kb config partition on netgear wgt634u) */
++		bcm47xx_parts[3].offset = bcm47xx_parts[0].size;
++		bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
++	}
++
++	/* linux (kernel and rootfs) */
++	if (cfe_size != 384 * 1024) {
++		bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
++		bcm47xx_parts[1].size   = bcm47xx_parts[3].offset - 
++			bcm47xx_parts[1].offset;
++	} else {
++		/* do not count the elf loader, which is on one block */
++		bcm47xx_parts[1].offset = bcm47xx_parts[0].size + 
++			bcm47xx_parts[3].size + mtd->erasesize;
++		bcm47xx_parts[1].size   = size - 
++			bcm47xx_parts[0].size - 
++			(2*bcm47xx_parts[3].size) - 
++			mtd->erasesize;
++	}
++
++	/* find and size rootfs */
++	find_root(mtd,size,&bcm47xx_parts[2]);
++	bcm47xx_parts[2].size = size - bcm47xx_parts[2].offset - bcm47xx_parts[3].size;
++
++	return bcm47xx_parts;
++}
++#endif
++
++int __init init_bcm47xx_map(void)
++{
++#ifdef CONFIG_SSB
++	struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
++#endif
++	size_t size;
++	int ret = 0;
++#ifdef CONFIG_MTD_PARTITIONS
++	struct mtd_partition *parts;
++	int i;
++#endif
++
++#ifdef CONFIG_SSB
++	u32 window = mcore->flash_window;
++	u32 window_size = mcore->flash_window_size;
++
++	printk("flash init: 0x%08x 0x%08x\n", window, window_size);
++	bcm47xx_map.phys = window;
++	bcm47xx_map.size = window_size;
++	bcm47xx_map.bankwidth = mcore->flash_buswidth;
++	bcm47xx_map.virt = ioremap_nocache(window, window_size);
++#else
++	printk("flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
++	bcm47xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
++#endif
++
++	if (!bcm47xx_map.virt) {
++		printk("Failed to ioremap\n");
++		return -EIO;
++	}
++
++	simple_map_init(&bcm47xx_map);
++	
++	if (!(bcm47xx_mtd = do_map_probe("cfi_probe", &bcm47xx_map))) {
++		printk("Failed to do_map_probe\n");
++		iounmap((void *)bcm47xx_map.virt);
++		return -ENXIO;
++	}
++
++	/* override copy_from routine */
++ 	//bcm47xx_map.copy_from = bcm47xx_map_copy_from;
++
++	bcm47xx_mtd->owner = THIS_MODULE;
++
++	size = bcm47xx_mtd->size;
++
++	printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
++
++#ifdef CONFIG_MTD_PARTITIONS
++	parts = init_mtd_partitions(bcm47xx_mtd, size);
++	for (i = 0; parts[i].name; i++);
++	ret = add_mtd_partitions(bcm47xx_mtd, parts, i);
++	if (ret) {
++		printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
++		goto fail;
++	}
++#endif
++	return 0;
++
++ fail:
++	if (bcm47xx_mtd)
++		map_destroy(bcm47xx_mtd);
++	if (bcm47xx_map.virt)
++		iounmap((void *)bcm47xx_map.virt);
++	bcm47xx_map.virt = 0;
++	return ret;
++}
++
++void __exit cleanup_bcm47xx_map(void)
++{
++#ifdef CONFIG_MTD_PARTITIONS
++	del_mtd_partitions(bcm47xx_mtd);
++#endif
++	map_destroy(bcm47xx_mtd);
++	iounmap((void *)bcm47xx_map.virt);
++}
++
++module_init(init_bcm47xx_map);
++module_exit(cleanup_bcm47xx_map);
+diff -Nur linux-2.6.34.orig/drivers/mtd/maps/Kconfig linux-2.6.34/drivers/mtd/maps/Kconfig
+--- linux-2.6.34.orig/drivers/mtd/maps/Kconfig	2010-05-16 23:17:36.000000000 +0200
++++ linux-2.6.34/drivers/mtd/maps/Kconfig	2010-05-30 15:13:31.141614159 +0200
+@@ -319,6 +319,12 @@
+ 	  Mapping for the Flaga digital module. If you don't have one, ignore
+ 	  this setting.
+ 
++config MTD_BCM47XX
++	tristate "BCM47xx flash device"
++	depends on MIPS && MTD_CFI && BCM47XX
++	help
++	  Support for the flash chips on the BCM947xx board.
++
+ config MTD_REDWOOD
+ 	tristate "CFI Flash devices mapped on IBM Redwood"
+ 	depends on MTD_CFI && ( REDWOOD_4 || REDWOOD_5 || REDWOOD_6 )
+diff -Nur linux-2.6.34.orig/drivers/mtd/maps/Makefile linux-2.6.34/drivers/mtd/maps/Makefile
+--- linux-2.6.34.orig/drivers/mtd/maps/Makefile	2010-05-16 23:17:36.000000000 +0200
++++ linux-2.6.34/drivers/mtd/maps/Makefile	2010-05-30 15:13:31.141614159 +0200
+@@ -29,6 +29,7 @@
+ obj-$(CONFIG_MTD_PCMCIA)	+= pcmciamtd.o
+ obj-$(CONFIG_MTD_RPXLITE)	+= rpxlite.o
+ obj-$(CONFIG_MTD_TQM8XXL)	+= tqm8xxl.o
++obj-$(CONFIG_MTD_BCM47XX)	+= bcm47xx-flash.o
+ obj-$(CONFIG_MTD_SA1100)	+= sa1100-flash.o
+ obj-$(CONFIG_MTD_SBC_GXX)	+= sbc_gxx.o
+ obj-$(CONFIG_MTD_SC520CDP)	+= sc520cdp.o