path: root/openwrt/target/linux/linux-2.6/patches/brcm/002-flash-map.patch

diff -Nur linux-2.6.12.5/drivers/mtd/maps/bcm47xx-flash.c linux-2.6.12.5-flash/drivers/mtd/maps/bcm47xx-flash.c
--- linux-2.6.12.5/drivers/mtd/maps/bcm47xx-flash.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.12.5-flash/drivers/mtd/maps/bcm47xx-flash.c	2005-11-06 20:36:42.553198500 +0100
@@ -0,0 +1,329 @@
+/*
+ *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
+ *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.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.
+ *
+ *  $Id: bcm47xx-flash.c,v 1.1 2004/10/21 07:18:31 jolt Exp $
+ *
+ *  Flash mapping for BCM947XX boards
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/config.h>
+#include <typedefs.h>
+#include <bcmutils.h>
+#include <bcmnvram.h>
+#include <trxhdr.h>
+
+
+#ifdef CONFIG_MTD_PARTITIONS
+extern struct mtd_partition * init_mtd_partitions(struct mtd_info *mtd, size_t size);
+#endif
+
+#define WINDOW_ADDR 0x1c000000
+#define WINDOW_SIZE (0x400000*2)
+#define BUSWIDTH 2
+
+static struct mtd_info *bcm947xx_mtd;
+
+static void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+#define MIPS_MEMCPY_ALIGN 4
+	map_word ret;
+	ssize_t transfer;
+	ssize_t done = 0;
+	if ((len >= MIPS_MEMCPY_ALIGN) && (!(from & (MIPS_MEMCPY_ALIGN - 1))) && (!(((unsigned int)to & (MIPS_MEMCPY_ALIGN - 1))))) {
+		done = len & ~(MIPS_MEMCPY_ALIGN - 1);
+		memcpy_fromio(to, map->virt + from, done);
+	}
+	while (done < len) {
+		ret = map->read(map, from + done);
+		transfer = len - done;
+		if (transfer > map->bankwidth)
+			transfer = map->bankwidth;
+		memcpy((void *)((unsigned long)to + done), &ret.x[0], transfer);
+		done += transfer;
+	}
+}
+
+static struct map_info bcm947xx_map = {
+	name: "Physically mapped flash",
+	size: WINDOW_SIZE,
+	bankwidth: BUSWIDTH,
+	phys: WINDOW_ADDR,
+};
+
+#ifdef CONFIG_MTD_PARTITIONS
+
+static struct mtd_partition bcm947xx_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: "OpenWrt", 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 cfe_size_flag;
+
+	trx = (struct trx_header *) buf;
+
+	cfe_size_flag=0;
+
+	for (off = (256*1024); off < size; off += mtd->erasesize) {
+		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 done;
+		}
+		cfe_size_flag += 1;
+	}
+
+	printk(KERN_NOTICE
+	       "%s: Couldn't find bootloader size\n",
+	       mtd->name);
+	return -1;
+
+ done:
+	printk(KERN_NOTICE "bootloader size flag: %d\n", cfe_size_flag);
+	return cfe_size_flag;
+
+}
+
+static int __init
+find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
+{
+	struct trx_header *trx;
+	unsigned char buf[512];
+	int off;
+	size_t len;
+
+	trx = (struct trx_header *) buf;
+
+	for (off = (256*1024); off < size; off += mtd->erasesize) {
+		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) {
+			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 done;
+		}
+	}
+
+	printk(KERN_NOTICE
+	       "%s: Couldn't find root filesystem\n",
+	       mtd->name);
+	return -1;
+
+ done:
+	return part->size;
+}
+
+struct mtd_partition * __init
+init_mtd_partitions(struct mtd_info *mtd, size_t size)
+{
+
+	int cfe_size_flag;
+
+	cfe_size_flag = find_cfe_size(mtd,size); 
+
+	/* if cfe_size_flag=0, cfe size is 256 kb, else 384 kb */
+
+	/* boot loader */
+	bcm947xx_parts[0].offset = 0;
+	if (cfe_size_flag == 0) {
+		bcm947xx_parts[0].size	 = 1024*256;
+	} else {
+		/* netgear wgt634u has 384 kb bootloader */
+		bcm947xx_parts[0].size   = 1024*384;
+	}
+
+	/* nvram */
+	if (cfe_size_flag == 0) {
+		bcm947xx_parts[3].offset = size - mtd->erasesize;
+		bcm947xx_parts[3].size   = mtd->erasesize;
+	} else {
+		/* nvram (old 128kb config partition on netgear wgt634u) */
+		bcm947xx_parts[3].offset = bcm947xx_parts[0].size;
+		bcm947xx_parts[3].size   = 1024*128;
+	}
+
+	/* linux (kernel and rootfs) */
+	if (cfe_size_flag == 0) {
+		bcm947xx_parts[1].offset = bcm947xx_parts[0].size;
+		bcm947xx_parts[1].size   = bcm947xx_parts[3].offset - 
+			bcm947xx_parts[1].offset;
+	} else {
+		/* do not count the elf loader, which is on one sector */
+		bcm947xx_parts[1].offset = bcm947xx_parts[0].size + 
+			bcm947xx_parts[3].size + mtd->erasesize;
+		bcm947xx_parts[1].size   = size - 
+			bcm947xx_parts[0].size - 
+			(2*bcm947xx_parts[3].size) - 
+			mtd->erasesize;
+	}
+
+	/* find and size rootfs */
+	if (find_root(mtd,size,&bcm947xx_parts[2])==0) {
+		/* entirely jffs2 */
+		bcm947xx_parts[4].name = NULL;
+		if (cfe_size_flag == 0) {
+			bcm947xx_parts[2].size = bcm947xx_parts[3].offset - 
+				bcm947xx_parts[2].offset;
+		} else {
+			bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset - 
+				bcm947xx_parts[3].size; 
+		}
+	} else {
+		/* legacy setup */
+		/* calculate leftover flash, and assign it to the jffs2 partition */
+		if (cfe_size_flag == 0) {
+			bcm947xx_parts[4].offset = bcm947xx_parts[2].offset + 
+				bcm947xx_parts[2].size;
+			bcm947xx_parts[4].size = bcm947xx_parts[3].offset - 
+				bcm947xx_parts[4].offset;
+		} else {
+			bcm947xx_parts[4].offset = bcm947xx_parts[2].offset + 
+				bcm947xx_parts[2].size;
+			if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
+				bcm947xx_parts[4].offset += mtd->erasesize - 
+					(bcm947xx_parts[4].offset % mtd->erasesize);
+			}
+			bcm947xx_parts[4].size = size - bcm947xx_parts[3].size - 
+				bcm947xx_parts[4].offset;
+		}
+	}
+
+	return bcm947xx_parts;
+}
+
+EXPORT_SYMBOL(init_mtd_partitions);
+#endif
+
+int __init init_bcm947xx_map(void)
+{
+	size_t size;
+	int ret = 0;
+#ifdef CONFIG_MTD_PARTITIONS
+	struct mtd_partition *parts;
+	int i;
+#endif
+
+	bcm947xx_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
+
+	if (!bcm947xx_map.virt) {
+		printk("Failed to ioremap\n");
+		return -EIO;
+	}
+	simple_map_init(&bcm947xx_map);
+	
+	bcm947xx_map.copy_from = bcm947xx_map_copy_from;
+	
+	if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
+		printk("Failed to do_map_probe\n");
+		iounmap((void *)bcm947xx_map.virt);
+		return -ENXIO;
+	}
+
+	bcm947xx_mtd->owner = THIS_MODULE;
+
+	size = bcm947xx_mtd->size;
+
+	printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", bcm947xx_mtd->size, WINDOW_ADDR);
+
+#ifdef CONFIG_MTD_PARTITIONS
+	parts = init_mtd_partitions(bcm947xx_mtd, size);
+	for (i = 0; parts[i].name; i++);
+	ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
+	if (ret) {
+		printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
+		goto fail;
+	}
+#endif
+
+	return 0;
+
+ fail:
+	if (bcm947xx_mtd)
+		map_destroy(bcm947xx_mtd);
+	if (bcm947xx_map.map_priv_1)
+		iounmap((void *) bcm947xx_map.map_priv_1);
+	bcm947xx_map.map_priv_1 = 0;
+	return ret;
+}
+
+void __exit cleanup_bcm947xx_map(void)
+{
+#ifdef CONFIG_MTD_PARTITIONS
+	del_mtd_partitions(bcm947xx_mtd);
+#endif
+	map_destroy(bcm947xx_mtd);
+	iounmap((void *)bcm947xx_map.virt);
+}
+
+module_init(init_bcm947xx_map);
+module_exit(cleanup_bcm947xx_map);
diff -Nur linux-2.6.12.5/drivers/mtd/maps/Kconfig linux-2.6.12.5-flash/drivers/mtd/maps/Kconfig
--- linux-2.6.12.5/drivers/mtd/maps/Kconfig	2005-08-15 02:20:18.000000000 +0200
+++ linux-2.6.12.5-flash/drivers/mtd/maps/Kconfig	2005-09-16 22:27:36.000000000 +0200
@@ -357,6 +357,12 @@
 	  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 && BCM947XX
+	help
+	  Support for the flash chips on the BCM947xx board.
+	  
 config MTD_BEECH
 	tristate "CFI Flash device mapped on IBM 405LP Beech"
 	depends on MTD_CFI && PPC32 && 40x && BEECH
diff -Nur linux-2.6.12.5/drivers/mtd/maps/Makefile linux-2.6.12.5-flash/drivers/mtd/maps/Makefile
--- linux-2.6.12.5/drivers/mtd/maps/Makefile	2005-08-15 02:20:18.000000000 +0200
+++ linux-2.6.12.5-flash/drivers/mtd/maps/Makefile	2005-09-16 22:27:01.000000000 +0200
@@ -31,6 +31,7 @@
 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_IPAQ)		+= ipaq-flash.o
 obj-$(CONFIG_MTD_SBC_GXX)	+= sbc_gxx.o