source: freewrt/target/linux/brcm-2.4/patches/003-flash-map.patch@ 476d5a8

drivers/mtd/maps/bcm947xx-flash.c

@@ +1 @@
+/*
+ *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
+ *  Copyright (C) 2006 Waldemar Brodkorb <wbx@freewrt.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 <typedefs.h>
+#include <osl.h>
+#include <bcmnvram.h>
+#include <bcmutils.h>
+#include <sbconfig.h>
+#include <sbchipc.h>
+#include <sbutils.h>
+#include <trxhdr.h>
+
+/* Global SB handle */
+extern void *bcm947xx_sbh;
+extern spinlock_t bcm947xx_sbh_lock;
+
+/* Convenience */
+#define sbh bcm947xx_sbh
+#define sbh_lock bcm947xx_sbh_lock
+
+#define WINDOW_ADDR 0x1fc00000
+#define WINDOW_SIZE 0x400000
+#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: "fwcf", offset: 0, size: 0, },
+        { name: "nvram", offset: 0, size: 0, },
+        { name: "data", offset: 0, size: 0, },
+        { name: NULL, },
+};
+
+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;
+        int blocksize;
+
+        trx = (struct trx_header *) buf;
+
+        blocksize = mtd->erasesize;
+        if (blocksize < 0x10000)
+                blocksize = 0x10000;
+
+        for (off = (256*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) {
+                        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)
+{
+
+        /* boot loader 256 kB */
+        bcm947xx_parts[0].offset = 0;
+        bcm947xx_parts[0].size   = 256*1024;
+
+        /* nvram */
+        bcm947xx_parts[4].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
+        bcm947xx_parts[4].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
+
+        /* fwcf 128 kB before nvram */
+        bcm947xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize)
+                - 128*1024;
+        bcm947xx_parts[3].size   = 128*1024;
+
+        /* linux (kernel and rootfs) */
+        bcm947xx_parts[1].offset = bcm947xx_parts[0].size;
+        bcm947xx_parts[1].size   = bcm947xx_parts[3].offset - 
+                bcm947xx_parts[1].offset;
+
+        /* find and size rootfs */
+        if (find_root(mtd,size,&bcm947xx_parts[2])==0) {
+                /* entirely jffs2 */
+                bcm947xx_parts[5].name = NULL;
+                bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset - 
+                        bcm947xx_parts[4].size - bcm947xx_parts[3].size;
+        } else {
+                /* calculate leftover flash and assign it to a jffs2 partition */
+                bcm947xx_parts[5].offset = bcm947xx_parts[2].offset + 
+                        bcm947xx_parts[2].size;
+                if ((bcm947xx_parts[5].offset % mtd->erasesize) > 0) {
+                        bcm947xx_parts[5].offset += mtd->erasesize - 
+                                (bcm947xx_parts[5].offset % mtd->erasesize);
+                }
+                bcm947xx_parts[5].size = bcm947xx_parts[3].offset - 
+                        bcm947xx_parts[5].offset;
+        }
+        return bcm947xx_parts;
+}
+
+#endif
+
+
+mod_init_t init_bcm947xx_map(void)
+{
+        ulong flags;
+        uint coreidx;
+        chipcregs_t *cc;
+        uint32 fltype;
+        uint window_addr = 0, window_size = 0;
+        size_t size;
+        int ret = 0;
+#ifdef CONFIG_MTD_PARTITIONS
+        struct mtd_partition *parts;
+        int i;
+#endif
+
+        spin_lock_irqsave(&sbh_lock, flags);
+        coreidx = sb_coreidx(sbh);
+
+        /* Check strapping option if chipcommon exists */
+        if ((cc = sb_setcore(sbh, SB_CC, 0))) {
+                fltype = readl(&cc->capabilities) & CAP_FLASH_MASK;
+                if (fltype == PFLASH) {
+                        bcm947xx_map.map_priv_2 = 1;
+                        window_addr = 0x1c000000;
+                        bcm947xx_map.size = window_size = 32 * 1024 * 1024;
+                        if ((readl(&cc->flash_config) & CC_CFG_DS) == 0)
+                                bcm947xx_map.buswidth = 1;
+                }
+        } else {
+                fltype = PFLASH;
+                bcm947xx_map.map_priv_2 = 0;
+                window_addr = WINDOW_ADDR;
+                window_size = WINDOW_SIZE;
+        }
+
+        sb_setcoreidx(sbh, coreidx);
+        spin_unlock_irqrestore(&sbh_lock, flags);
+
+        if (fltype != PFLASH) {
+                ret = -ENODEV;
+                goto fail;
+        }
+
+        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);

drivers/mtd/maps/Config.in

@@ -48 +48 @@
 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

drivers/mtd/maps/Makefile

@@ -3 +3 @@
 #
 # $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 +12 @@
 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