| /* |
| * Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org> |
| * Mike Albon <malbon@openwrt.org> |
| * Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net> |
| * |
| * 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 program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/mtd/map.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/partitions.h> |
| #include <linux/vmalloc.h> |
| #include <linux/platform_device.h> |
| #include <linux/io.h> |
| |
| #include <asm/mach-bcm63xx/bcm963xx_tag.h> |
| |
| #define BCM63XX_BUSWIDTH 2 /* Buswidth */ |
| #define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */ |
| |
| #define PFX KBUILD_MODNAME ": " |
| |
| static struct mtd_partition *parsed_parts; |
| |
| static struct mtd_info *bcm963xx_mtd_info; |
| |
| static struct map_info bcm963xx_map = { |
| .name = "bcm963xx", |
| .bankwidth = BCM63XX_BUSWIDTH, |
| }; |
| |
| static int parse_cfe_partitions(struct mtd_info *master, |
| struct mtd_partition **pparts) |
| { |
| /* CFE, NVRAM and global Linux are always present */ |
| int nrparts = 3, curpart = 0; |
| struct bcm_tag *buf; |
| struct mtd_partition *parts; |
| int ret; |
| size_t retlen; |
| unsigned int rootfsaddr, kerneladdr, spareaddr; |
| unsigned int rootfslen, kernellen, sparelen, totallen; |
| int namelen = 0; |
| int i; |
| char *boardid; |
| char *tagversion; |
| |
| /* Allocate memory for buffer */ |
| buf = vmalloc(sizeof(struct bcm_tag)); |
| if (!buf) |
| return -ENOMEM; |
| |
| /* Get the tag */ |
| ret = master->read(master, master->erasesize, sizeof(struct bcm_tag), |
| &retlen, (void *)buf); |
| if (retlen != sizeof(struct bcm_tag)) { |
| vfree(buf); |
| return -EIO; |
| } |
| |
| sscanf(buf->kernel_address, "%u", &kerneladdr); |
| sscanf(buf->kernel_length, "%u", &kernellen); |
| sscanf(buf->total_length, "%u", &totallen); |
| tagversion = &(buf->tag_version[0]); |
| boardid = &(buf->board_id[0]); |
| |
| printk(KERN_INFO PFX "CFE boot tag found with version %s " |
| "and board type %s\n", tagversion, boardid); |
| |
| kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE; |
| rootfsaddr = kerneladdr + kernellen; |
| spareaddr = roundup(totallen, master->erasesize) + master->erasesize; |
| sparelen = master->size - spareaddr - master->erasesize; |
| rootfslen = spareaddr - rootfsaddr; |
| |
| /* Determine number of partitions */ |
| namelen = 8; |
| if (rootfslen > 0) { |
| nrparts++; |
| namelen += 6; |
| }; |
| if (kernellen > 0) { |
| nrparts++; |
| namelen += 6; |
| }; |
| |
| /* Ask kernel for more memory */ |
| parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL); |
| if (!parts) { |
| vfree(buf); |
| return -ENOMEM; |
| }; |
| |
| /* Start building partition list */ |
| parts[curpart].name = "CFE"; |
| parts[curpart].offset = 0; |
| parts[curpart].size = master->erasesize; |
| curpart++; |
| |
| if (kernellen > 0) { |
| parts[curpart].name = "kernel"; |
| parts[curpart].offset = kerneladdr; |
| parts[curpart].size = kernellen; |
| curpart++; |
| }; |
| |
| if (rootfslen > 0) { |
| parts[curpart].name = "rootfs"; |
| parts[curpart].offset = rootfsaddr; |
| parts[curpart].size = rootfslen; |
| if (sparelen > 0) |
| parts[curpart].size += sparelen; |
| curpart++; |
| }; |
| |
| parts[curpart].name = "nvram"; |
| parts[curpart].offset = master->size - master->erasesize; |
| parts[curpart].size = master->erasesize; |
| |
| /* Global partition "linux" to make easy firmware upgrade */ |
| curpart++; |
| parts[curpart].name = "linux"; |
| parts[curpart].offset = parts[0].size; |
| parts[curpart].size = master->size - parts[0].size - parts[3].size; |
| |
| for (i = 0; i < nrparts; i++) |
| printk(KERN_INFO PFX "Partition %d is %s offset %lx and " |
| "length %lx\n", i, parts[i].name, |
| (long unsigned int)(parts[i].offset), |
| (long unsigned int)(parts[i].size)); |
| |
| printk(KERN_INFO PFX "Spare partition is %x offset and length %x\n", |
| spareaddr, sparelen); |
| *pparts = parts; |
| vfree(buf); |
| |
| return nrparts; |
| }; |
| |
| static int bcm963xx_detect_cfe(struct mtd_info *master) |
| { |
| int idoffset = 0x4e0; |
| static char idstring[8] = "CFE1CFE1"; |
| char buf[9]; |
| int ret; |
| size_t retlen; |
| |
| ret = master->read(master, idoffset, 8, &retlen, (void *)buf); |
| buf[retlen] = 0; |
| printk(KERN_INFO PFX "Read Signature value of %s\n", buf); |
| |
| return strncmp(idstring, buf, 8); |
| } |
| |
| static int bcm963xx_probe(struct platform_device *pdev) |
| { |
| int err = 0; |
| int parsed_nr_parts = 0; |
| char *part_type; |
| struct resource *r; |
| |
| r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!r) { |
| dev_err(&pdev->dev, "no resource supplied\n"); |
| return -ENODEV; |
| } |
| |
| bcm963xx_map.phys = r->start; |
| bcm963xx_map.size = resource_size(r); |
| bcm963xx_map.virt = ioremap(r->start, resource_size(r)); |
| if (!bcm963xx_map.virt) { |
| dev_err(&pdev->dev, "failed to ioremap\n"); |
| return -EIO; |
| } |
| |
| dev_info(&pdev->dev, "0x%08lx at 0x%08x\n", |
| bcm963xx_map.size, bcm963xx_map.phys); |
| |
| simple_map_init(&bcm963xx_map); |
| |
| bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map); |
| if (!bcm963xx_mtd_info) { |
| dev_err(&pdev->dev, "failed to probe using CFI\n"); |
| err = -EIO; |
| goto err_probe; |
| } |
| |
| bcm963xx_mtd_info->owner = THIS_MODULE; |
| |
| /* This is mutually exclusive */ |
| if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0) { |
| dev_info(&pdev->dev, "CFE bootloader detected\n"); |
| if (parsed_nr_parts == 0) { |
| int ret = parse_cfe_partitions(bcm963xx_mtd_info, |
| &parsed_parts); |
| if (ret > 0) { |
| part_type = "CFE"; |
| parsed_nr_parts = ret; |
| } |
| } |
| } else { |
| dev_info(&pdev->dev, "unsupported bootloader\n"); |
| err = -ENODEV; |
| goto err_probe; |
| } |
| |
| return add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, |
| parsed_nr_parts); |
| |
| err_probe: |
| iounmap(bcm963xx_map.virt); |
| return err; |
| } |
| |
| static int bcm963xx_remove(struct platform_device *pdev) |
| { |
| if (bcm963xx_mtd_info) { |
| del_mtd_partitions(bcm963xx_mtd_info); |
| map_destroy(bcm963xx_mtd_info); |
| } |
| |
| if (bcm963xx_map.virt) { |
| iounmap(bcm963xx_map.virt); |
| bcm963xx_map.virt = 0; |
| } |
| |
| return 0; |
| } |
| |
| static struct platform_driver bcm63xx_mtd_dev = { |
| .probe = bcm963xx_probe, |
| .remove = bcm963xx_remove, |
| .driver = { |
| .name = "bcm963xx-flash", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static int __init bcm963xx_mtd_init(void) |
| { |
| return platform_driver_register(&bcm63xx_mtd_dev); |
| } |
| |
| static void __exit bcm963xx_mtd_exit(void) |
| { |
| platform_driver_unregister(&bcm63xx_mtd_dev); |
| } |
| |
| module_init(bcm963xx_mtd_init); |
| module_exit(bcm963xx_mtd_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Broadcom BCM63xx MTD driver for CFE and RedBoot"); |
| MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>"); |
| MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); |
| MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>"); |