openwrt-xburst/target/linux/linux-2.4/patches/brcm/004-flash-map.patch

diff -Nur linux-2.4.32/drivers/mtd/maps/bcm947xx-flash.c linux-2.4.32-flash/drivers/mtd/maps/bcm947xx-flash.c
--- linux-2.4.32/drivers/mtd/maps/bcm947xx-flash.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.32-flash/drivers/mtd/maps/bcm947xx-flash.c	2005-12-19 01:29:52.464670750 +0100
@@ -0,0 +1,366 @@
+/*
+ *  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 2004, 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/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#ifdef CONFIG_MTD_PARTITIONS
+#include <linux/mtd/partitions.h>
+#endif
+#include <linux/config.h>
+
+#include <trxhdr.h>
+
+#define WINDOW_ADDR 0x1c000000
+#define WINDOW_SIZE (0x400000*2)
+#define BUSWIDTH 2
+
+static struct mtd_info *bcm947xx_mtd;
+
+__u8 bcm947xx_map_read8(struct map_info *map, unsigned long ofs)
+{
+	if (map->map_priv_2 == 1)
+		return __raw_readb(map->map_priv_1 + ofs);
+
+	u16 val = __raw_readw(map->map_priv_1 + (ofs & ~1));
+	if (ofs & 1)
+		return ((val >> 8) & 0xff);
+	else
+		return (val & 0xff);
+}
+
+__u16 bcm947xx_map_read16(struct map_info *map, unsigned long ofs)
+{
+	return __raw_readw(map->map_priv_1 + ofs);
+}
+
+__u32 bcm947xx_map_read32(struct map_info *map, unsigned long ofs)
+{
+	return __raw_readl(map->map_priv_1 + ofs);
+}
+
+void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+	if (len==1) {
+		memcpy_fromio(to, map->map_priv_1 + from, len);
+	} else {
+		int i;
+		u16 *dest = (u16 *) to;
+		u16 *src  = (u16 *) (map->map_priv_1 + from);
+		for (i = 0; i < (len / 2); i++) {
+			dest[i] = src[i];
+		}
+		if (len & 1)
+			*((u8 *)dest+len-1) = src[i] & 0xff;
+	}
+}
+
+void bcm947xx_map_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+	__raw_writeb(d, map->map_priv_1 + adr);
+	mb();
+}
+
+void bcm947xx_map_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+	__raw_writew(d, map->map_priv_1 + adr);
+	mb();
+}
+
+void bcm947xx_map_write32(struct map_info *map, __u32 d, unsigned long adr)
+{
+	__raw_writel(d, map->map_priv_1 + adr);
+	mb();
+}
+
+void bcm947xx_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+	memcpy_toio(map->map_priv_1 + to, from, len);
+}
+
+struct map_info bcm947xx_map = {
+	name: "Physically mapped flash",
+	size: WINDOW_SIZE,
+	buswidth: BUSWIDTH,
+	read8: bcm947xx_map_read8,
+	read16: bcm947xx_map_read16,
+	read32: bcm947xx_map_read32,
+	copy_from: bcm947xx_map_copy_from,
+	write8: bcm947xx_map_write8,
+	write16: bcm947xx_map_write16,
+	write32: bcm947xx_map_write32,
+	copy_to: bcm947xx_map_copy_to
+};
+
+#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;
+
+	/* if cfe_size_flag=0, cfe size is 256 kb, else 384 kb */
+	cfe_size_flag = find_cfe_size(mtd,size); 
+
+	/* 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;
+	} else {
+		/* nvram (old 128kb config partition on netgear wgt634u) */
+		bcm947xx_parts[3].offset = bcm947xx_parts[0].size;
+	}
+	bcm947xx_parts[3].size = mtd->erasesize;
+
+	/* 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 block */
+		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;
+		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;
+			if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
+				bcm947xx_parts[4].offset += mtd->erasesize - 
+					(bcm947xx_parts[4].offset % mtd->erasesize);
+			}
+			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;
+}
+
+#endif
+
+
+mod_init_t init_bcm947xx_map(void)
+{
+	size_t size;
+	int ret = 0;
+#ifdef CONFIG_MTD_PARTITIONS
+	struct mtd_partition *parts;
+	int i;
+#endif
+
+	bcm947xx_map.map_priv_1 = (unsigned long) ioremap(WINDOW_ADDR, WINDOW_SIZE);
+
+	if (!bcm947xx_map.map_priv_1) {
+		printk(KERN_ERR "Failed to ioremap\n");
+		return -EIO;
+	}
+
+	if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
+		printk(KERN_ERR "pflash: cfi_probe failed\n");
+		iounmap((void *)bcm947xx_map.map_priv_1);
+		return -ENXIO;
+	}
+
+	bcm947xx_mtd->module = THIS_MODULE;
+
+	size = bcm947xx_mtd->size;
+
+	printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", 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;
+}
+
+mod_exit_t cleanup_bcm947xx_map(void)
+{
+#ifdef CONFIG_MTD_PARTITIONS
+	del_mtd_partitions(bcm947xx_mtd);
+#endif
+	map_destroy(bcm947xx_mtd);
+	iounmap((void *) bcm947xx_map.map_priv_1);
+	bcm947xx_map.map_priv_1 = 0;
+}
+
+module_init(init_bcm947xx_map);
+module_exit(cleanup_bcm947xx_map);
diff -Nur linux-2.4.32/drivers/mtd/maps/Config.in linux-2.4.32-flash/drivers/mtd/maps/Config.in
--- linux-2.4.32/drivers/mtd/maps/Config.in	2003-06-13 16:51:34.000000000 +0200
+++ linux-2.4.32-flash/drivers/mtd/maps/Config.in	2005-12-18 15:53:52.003277250 +0100
@@ -48,6 +48,7 @@
 fi
 
 if [ "$CONFIG_MIPS" = "y" ]; then
+   dep_tristate '  CFI Flash device mapped on Broadcom BCM947XX boards' CONFIG_MTD_BCM947XX $CONFIG_MTD_CFI
    dep_tristate '  Pb1000 MTD support' CONFIG_MTD_PB1000 $CONFIG_MIPS_PB1000
    dep_tristate '  Pb1500 MTD support' CONFIG_MTD_PB1500 $CONFIG_MIPS_PB1500
    dep_tristate '  Pb1100 MTD support' CONFIG_MTD_PB1100 $CONFIG_MIPS_PB1100
diff -Nur linux-2.4.32/drivers/mtd/maps/Makefile linux-2.4.32-flash/drivers/mtd/maps/Makefile
--- linux-2.4.32/drivers/mtd/maps/Makefile	2003-06-13 16:51:34.000000000 +0200
+++ linux-2.4.32-flash/drivers/mtd/maps/Makefile	2005-12-18 15:54:39.022215750 +0100
@@ -3,6 +3,8 @@
 #
 # $Id: Makefile,v 1.37 2003/01/24 14:26:38 dwmw2 Exp $
 
+EXTRA_CFLAGS := -I$(TOPDIR)/arch/mips/bcm947xx/include
+
 BELOW25		:= $(shell echo $(PATCHLEVEL) | sed s/[1234]/y/)
 
 ifeq ($(BELOW25),y)
@@ -10,6 +12,7 @@
 endif
 
 # Chip mappings
+obj-$(CONFIG_MTD_BCM947XX)	+= bcm947xx-flash.o
 obj-$(CONFIG_MTD_CDB89712)	+= cdb89712.o
 obj-$(CONFIG_MTD_ARM_INTEGRATOR)+= integrator-flash.o
 obj-$(CONFIG_MTD_CFI_FLAGADM)	+= cfi_flagadm.o