mirror of https://gitee.com/openkylin/linux.git
277 lines
7.1 KiB
C
277 lines
7.1 KiB
C
/*
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* Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org>
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* Mike Albon <malbon@openwrt.org>
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* Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
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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/slab.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 <linux/io.h>
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#include <asm/mach-bcm63xx/bcm963xx_tag.h>
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#define BCM63XX_BUSWIDTH 2 /* Buswidth */
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#define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */
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#define PFX KBUILD_MODNAME ": "
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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 = BCM63XX_BUSWIDTH,
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};
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static int parse_cfe_partitions(struct mtd_info *master,
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struct mtd_partition **pparts)
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{
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/* CFE, NVRAM and global Linux are always present */
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int nrparts = 3, curpart = 0;
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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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char *boardid;
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char *tagversion;
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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),
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&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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sscanf(buf->kernel_address, "%u", &kerneladdr);
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sscanf(buf->kernel_length, "%u", &kernellen);
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sscanf(buf->total_length, "%u", &totallen);
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tagversion = &(buf->tag_version[0]);
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boardid = &(buf->board_id[0]);
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printk(KERN_INFO PFX "CFE boot tag found with version %s "
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"and board type %s\n", tagversion, boardid);
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kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
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rootfsaddr = kerneladdr + kernellen;
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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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rootfslen = spareaddr - rootfsaddr;
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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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/* Global partition "linux" to make easy firmware upgrade */
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curpart++;
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parts[curpart].name = "linux";
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parts[curpart].offset = parts[0].size;
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parts[curpart].size = master->size - parts[0].size - parts[3].size;
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for (i = 0; i < nrparts; i++)
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printk(KERN_INFO PFX "Partition %d is %s offset %lx and "
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"length %lx\n", i, parts[i].name,
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(long unsigned int)(parts[i].offset),
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(long unsigned int)(parts[i].size));
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printk(KERN_INFO PFX "Spare partition is %x offset and length %x\n",
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spareaddr, sparelen);
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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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if (!r) {
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dev_err(&pdev->dev, "no resource supplied\n");
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return -ENODEV;
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}
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bcm963xx_map.phys = r->start;
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bcm963xx_map.size = resource_size(r);
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bcm963xx_map.virt = ioremap(r->start, resource_size(r));
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if (!bcm963xx_map.virt) {
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dev_err(&pdev->dev, "failed to ioremap\n");
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return -EIO;
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}
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dev_info(&pdev->dev, "0x%08lx at 0x%08x\n",
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bcm963xx_map.size, bcm963xx_map.phys);
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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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dev_err(&pdev->dev, "failed to probe using CFI\n");
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bcm963xx_mtd_info = do_map_probe("jedec_probe", &bcm963xx_map);
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if (bcm963xx_mtd_info)
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goto probe_ok;
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dev_err(&pdev->dev, "failed to probe using JEDEC\n");
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err = -EIO;
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goto err_probe;
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}
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probe_ok:
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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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dev_info(&pdev->dev, "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,
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&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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dev_info(&pdev->dev, "unsupported bootloader\n");
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err = -ENODEV;
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goto err_probe;
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}
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return mtd_device_register(bcm963xx_mtd_info, parsed_parts,
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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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mtd_device_unregister(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 driver for CFE and RedBoot");
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MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
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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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