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254 lines
6.8 KiB
C
254 lines
6.8 KiB
C
/*
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* Copyright (C) 2006-2008 Florian Fainelli <florian@openwrt.org>
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* Mike Albon <malbon@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/vmalloc.h>
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#include <linux/platform_device.h>
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#include <bcm_tag.h>
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#include <asm/io.h>
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#define BUSWIDTH 2 /* Buswidth */
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#define EXTENDED_SIZE 0xBFC00000 /* Extended flash address */
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#define PFX KBUILD_MODNAME ": "
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extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts, unsigned long fis_origin);
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static struct mtd_partition *parsed_parts;
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static struct mtd_info *bcm963xx_mtd_info;
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static struct map_info bcm963xx_map = {
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.name = "bcm963xx",
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.bankwidth = BUSWIDTH,
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};
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static int parse_cfe_partitions( struct mtd_info *master, struct mtd_partition **pparts)
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{
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int nrparts = 2, curpart = 0; /* CFE and NVRAM are always present. */
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struct bcm_tag *buf;
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struct mtd_partition *parts;
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int ret;
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size_t retlen;
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unsigned int rootfsaddr, kerneladdr, spareaddr;
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unsigned int rootfslen, kernellen, sparelen, totallen;
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int namelen = 0;
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int i;
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/* Allocate memory for buffer */
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buf = vmalloc(sizeof(struct bcm_tag));
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if (!buf)
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return -ENOMEM;
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/* Get the tag */
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ret = master->read(master,master->erasesize,sizeof(struct bcm_tag), &retlen, (void *)buf);
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if (retlen != sizeof(struct bcm_tag)){
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vfree(buf);
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return -EIO;
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}
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printk(KERN_INFO PFX "CFE boot tag found with version %s and board type %s.\n",buf->tagVersion,buf->boardid);
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/* Get the values and calculate */
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sscanf(buf->rootAddress,"%u", &rootfsaddr);
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rootfsaddr = rootfsaddr - EXTENDED_SIZE;
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sscanf(buf->rootLength, "%u", &rootfslen);
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sscanf(buf->kernelAddress, "%u", &kerneladdr);
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kerneladdr = kerneladdr - EXTENDED_SIZE;
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sscanf(buf->kernelLength, "%u", &kernellen);
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sscanf(buf->totalLength, "%u", &totallen);
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spareaddr = roundup(totallen,master->erasesize) + master->erasesize;
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sparelen = master->size - spareaddr - master->erasesize;
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/* Determine number of partitions */
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namelen = 8;
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if (rootfslen > 0){
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nrparts++;
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namelen =+ 6;
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};
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if (kernellen > 0) {
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nrparts++;
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namelen =+ 6;
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};
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/* Ask kernel for more memory */
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parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
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if (!parts) {
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vfree(buf);
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return -ENOMEM;
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};
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/* Start building partition list */
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parts[curpart].name = "CFE";
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parts[curpart].offset = 0;
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parts[curpart].size = master->erasesize;
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curpart++;
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if (kernellen > 0) {
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parts[curpart].name = "kernel";
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parts[curpart].offset = kerneladdr;
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parts[curpart].size = kernellen;
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curpart++;
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};
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if (rootfslen > 0) {
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parts[curpart].name = "rootfs";
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parts[curpart].offset = rootfsaddr;
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parts[curpart].size = rootfslen;
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if (sparelen > 0)
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parts[curpart].size += sparelen;
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curpart++;
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};
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parts[curpart].name = "nvram";
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parts[curpart].offset = master->size - master->erasesize;
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parts[curpart].size = master->erasesize;
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for (i = 0; i < nrparts; i++)
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printk(KERN_INFO PFX "Partition %d is %s offset %x and length %x\n", i, parts[i].name, parts[i].offset, parts[i].size);
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*pparts = parts;
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vfree(buf);
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return nrparts;
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};
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static int bcm963xx_detect_cfe(struct mtd_info *master)
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{
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int idoffset = 0x4e0;
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static char idstring[8] = "CFE1CFE1";
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char buf[9];
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int ret;
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size_t retlen;
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ret = master->read(master, idoffset, 8, &retlen, (void *)buf);
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buf[retlen] = 0;
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printk(KERN_INFO PFX "Read Signature value of %s\n", buf);
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return strncmp(idstring, buf, 8);
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}
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static int bcm963xx_probe(struct platform_device *pdev)
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{
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int err = 0;
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int parsed_nr_parts = 0;
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char *part_type;
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struct resource *r;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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bcm963xx_map.phys = r->start;
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bcm963xx_map.size = (r->end - r->start);
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bcm963xx_map.virt = ioremap(r->start, r->end - r->start);
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if (!bcm963xx_map.virt) {
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printk(KERN_ERR PFX "Failed to ioremap\n");
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return -EIO;
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}
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printk(KERN_INFO PFX "0x%08x at 0x%08x\n", (r->end - r->start) + 1, r->start);
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simple_map_init(&bcm963xx_map);
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bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map);
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if (!bcm963xx_mtd_info) {
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printk(KERN_ERR PFX "Failed to probe using CFI\n");
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err = -EIO;
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goto err_probe;
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}
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bcm963xx_mtd_info->owner = THIS_MODULE;
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/* This is mutually exclusive */
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if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0) {
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printk(KERN_INFO PFX "CFE bootloader detected\n");
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if (parsed_nr_parts == 0) {
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int ret = parse_cfe_partitions(bcm963xx_mtd_info, &parsed_parts);
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if (ret > 0) {
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part_type = "CFE";
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parsed_nr_parts = ret;
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}
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}
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} else {
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printk(KERN_INFO PFX "assuming RedBoot bootloader\n");
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if (bcm963xx_mtd_info->size > 0x00400000) {
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printk(KERN_INFO PFX "Support for extended flash memory size : 0x%08X ; ONLY 64MBIT SUPPORT\n", bcm963xx_mtd_info->size);
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bcm963xx_map.virt = (u32)(EXTENDED_SIZE);
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}
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#ifdef CONFIG_MTD_REDBOOT_PARTS
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if (parsed_nr_parts == 0) {
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int ret = parse_redboot_partitions(bcm963xx_mtd_info, &parsed_parts, 0);
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if (ret > 0) {
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part_type = "RedBoot";
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parsed_nr_parts = ret;
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}
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}
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#endif
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}
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return add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, parsed_nr_parts);
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err_probe:
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iounmap(bcm963xx_map.virt);
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return err;
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}
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static int bcm963xx_remove(struct platform_device *pdev)
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{
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if (bcm963xx_mtd_info) {
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del_mtd_partitions(bcm963xx_mtd_info);
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map_destroy(bcm963xx_mtd_info);
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}
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if (bcm963xx_map.virt) {
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iounmap(bcm963xx_map.virt);
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bcm963xx_map.virt = 0;
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}
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return 0;
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}
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static struct platform_driver bcm63xx_mtd_dev = {
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.probe = bcm963xx_probe,
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.remove = bcm963xx_remove,
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.driver = {
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.name = "bcm963xx-flash",
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.owner = THIS_MODULE,
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},
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};
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static int __init bcm963xx_mtd_init(void)
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{
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return platform_driver_register(&bcm63xx_mtd_dev);
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}
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static void __exit bcm963xx_mtd_exit(void)
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{
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platform_driver_unregister(&bcm63xx_mtd_dev);
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}
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module_init(bcm963xx_mtd_init);
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module_exit(bcm963xx_mtd_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Broadcom BCM63xx MTD partition parser/mapping for CFE and RedBoot");
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MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");
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