Florian Fainelli | bc49c28 | 2010-09-12 15:52:59 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org> |
| 3 | * Mike Albon <malbon@openwrt.org> |
| 4 | * Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/mtd/map.h> |
| 25 | #include <linux/mtd/mtd.h> |
| 26 | #include <linux/mtd/partitions.h> |
| 27 | #include <linux/vmalloc.h> |
| 28 | #include <linux/platform_device.h> |
| 29 | #include <linux/io.h> |
| 30 | |
| 31 | #include <asm/mach-bcm63xx/bcm963xx_tag.h> |
| 32 | |
| 33 | #define BCM63XX_BUSWIDTH 2 /* Buswidth */ |
| 34 | #define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */ |
| 35 | |
| 36 | #define PFX KBUILD_MODNAME ": " |
| 37 | |
| 38 | static struct mtd_partition *parsed_parts; |
| 39 | |
| 40 | static struct mtd_info *bcm963xx_mtd_info; |
| 41 | |
| 42 | static struct map_info bcm963xx_map = { |
| 43 | .name = "bcm963xx", |
| 44 | .bankwidth = BCM63XX_BUSWIDTH, |
| 45 | }; |
| 46 | |
| 47 | static int parse_cfe_partitions(struct mtd_info *master, |
| 48 | struct mtd_partition **pparts) |
| 49 | { |
| 50 | /* CFE, NVRAM and global Linux are always present */ |
| 51 | int nrparts = 3, curpart = 0; |
| 52 | struct bcm_tag *buf; |
| 53 | struct mtd_partition *parts; |
| 54 | int ret; |
| 55 | size_t retlen; |
| 56 | unsigned int rootfsaddr, kerneladdr, spareaddr; |
| 57 | unsigned int rootfslen, kernellen, sparelen, totallen; |
| 58 | int namelen = 0; |
| 59 | int i; |
| 60 | char *boardid; |
| 61 | char *tagversion; |
| 62 | |
| 63 | /* Allocate memory for buffer */ |
| 64 | buf = vmalloc(sizeof(struct bcm_tag)); |
| 65 | if (!buf) |
| 66 | return -ENOMEM; |
| 67 | |
| 68 | /* Get the tag */ |
| 69 | ret = master->read(master, master->erasesize, sizeof(struct bcm_tag), |
| 70 | &retlen, (void *)buf); |
| 71 | if (retlen != sizeof(struct bcm_tag)) { |
| 72 | vfree(buf); |
| 73 | return -EIO; |
| 74 | } |
| 75 | |
| 76 | sscanf(buf->kernel_address, "%u", &kerneladdr); |
| 77 | sscanf(buf->kernel_length, "%u", &kernellen); |
| 78 | sscanf(buf->total_length, "%u", &totallen); |
| 79 | tagversion = &(buf->tag_version[0]); |
| 80 | boardid = &(buf->board_id[0]); |
| 81 | |
| 82 | printk(KERN_INFO PFX "CFE boot tag found with version %s " |
| 83 | "and board type %s\n", tagversion, boardid); |
| 84 | |
| 85 | kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE; |
| 86 | rootfsaddr = kerneladdr + kernellen; |
| 87 | spareaddr = roundup(totallen, master->erasesize) + master->erasesize; |
| 88 | sparelen = master->size - spareaddr - master->erasesize; |
| 89 | rootfslen = spareaddr - rootfsaddr; |
| 90 | |
| 91 | /* Determine number of partitions */ |
| 92 | namelen = 8; |
| 93 | if (rootfslen > 0) { |
| 94 | nrparts++; |
| 95 | namelen += 6; |
| 96 | }; |
| 97 | if (kernellen > 0) { |
| 98 | nrparts++; |
| 99 | namelen += 6; |
| 100 | }; |
| 101 | |
| 102 | /* Ask kernel for more memory */ |
| 103 | parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL); |
| 104 | if (!parts) { |
| 105 | vfree(buf); |
| 106 | return -ENOMEM; |
| 107 | }; |
| 108 | |
| 109 | /* Start building partition list */ |
| 110 | parts[curpart].name = "CFE"; |
| 111 | parts[curpart].offset = 0; |
| 112 | parts[curpart].size = master->erasesize; |
| 113 | curpart++; |
| 114 | |
| 115 | if (kernellen > 0) { |
| 116 | parts[curpart].name = "kernel"; |
| 117 | parts[curpart].offset = kerneladdr; |
| 118 | parts[curpart].size = kernellen; |
| 119 | curpart++; |
| 120 | }; |
| 121 | |
| 122 | if (rootfslen > 0) { |
| 123 | parts[curpart].name = "rootfs"; |
| 124 | parts[curpart].offset = rootfsaddr; |
| 125 | parts[curpart].size = rootfslen; |
| 126 | if (sparelen > 0) |
| 127 | parts[curpart].size += sparelen; |
| 128 | curpart++; |
| 129 | }; |
| 130 | |
| 131 | parts[curpart].name = "nvram"; |
| 132 | parts[curpart].offset = master->size - master->erasesize; |
| 133 | parts[curpart].size = master->erasesize; |
| 134 | |
| 135 | /* Global partition "linux" to make easy firmware upgrade */ |
| 136 | curpart++; |
| 137 | parts[curpart].name = "linux"; |
| 138 | parts[curpart].offset = parts[0].size; |
| 139 | parts[curpart].size = master->size - parts[0].size - parts[3].size; |
| 140 | |
| 141 | for (i = 0; i < nrparts; i++) |
| 142 | printk(KERN_INFO PFX "Partition %d is %s offset %lx and " |
| 143 | "length %lx\n", i, parts[i].name, |
| 144 | (long unsigned int)(parts[i].offset), |
| 145 | (long unsigned int)(parts[i].size)); |
| 146 | |
| 147 | printk(KERN_INFO PFX "Spare partition is %x offset and length %x\n", |
| 148 | spareaddr, sparelen); |
| 149 | *pparts = parts; |
| 150 | vfree(buf); |
| 151 | |
| 152 | return nrparts; |
| 153 | }; |
| 154 | |
| 155 | static int bcm963xx_detect_cfe(struct mtd_info *master) |
| 156 | { |
| 157 | int idoffset = 0x4e0; |
| 158 | static char idstring[8] = "CFE1CFE1"; |
| 159 | char buf[9]; |
| 160 | int ret; |
| 161 | size_t retlen; |
| 162 | |
| 163 | ret = master->read(master, idoffset, 8, &retlen, (void *)buf); |
| 164 | buf[retlen] = 0; |
| 165 | printk(KERN_INFO PFX "Read Signature value of %s\n", buf); |
| 166 | |
| 167 | return strncmp(idstring, buf, 8); |
| 168 | } |
| 169 | |
| 170 | static int bcm963xx_probe(struct platform_device *pdev) |
| 171 | { |
| 172 | int err = 0; |
| 173 | int parsed_nr_parts = 0; |
| 174 | char *part_type; |
| 175 | struct resource *r; |
| 176 | |
| 177 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 178 | if (!r) { |
| 179 | dev_err(&pdev->dev, "no resource supplied\n"); |
| 180 | return -ENODEV; |
| 181 | } |
| 182 | |
| 183 | bcm963xx_map.phys = r->start; |
| 184 | bcm963xx_map.size = resource_size(r); |
| 185 | bcm963xx_map.virt = ioremap(r->start, resource_size(r)); |
| 186 | if (!bcm963xx_map.virt) { |
| 187 | dev_err(&pdev->dev, "failed to ioremap\n"); |
| 188 | return -EIO; |
| 189 | } |
| 190 | |
| 191 | dev_info(&pdev->dev, "0x%08lx at 0x%08x\n", |
| 192 | bcm963xx_map.size, bcm963xx_map.phys); |
| 193 | |
| 194 | simple_map_init(&bcm963xx_map); |
| 195 | |
| 196 | bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map); |
| 197 | if (!bcm963xx_mtd_info) { |
| 198 | dev_err(&pdev->dev, "failed to probe using CFI\n"); |
Guillaume LECERF | 3345cc4 | 2010-10-29 16:17:49 +0200 | [diff] [blame] | 199 | bcm963xx_mtd_info = do_map_probe("jedec_probe", &bcm963xx_map); |
| 200 | if (bcm963xx_mtd_info) |
| 201 | goto probe_ok; |
| 202 | dev_err(&pdev->dev, "failed to probe using JEDEC\n"); |
Florian Fainelli | bc49c28 | 2010-09-12 15:52:59 +0200 | [diff] [blame] | 203 | err = -EIO; |
| 204 | goto err_probe; |
| 205 | } |
| 206 | |
Guillaume LECERF | 3345cc4 | 2010-10-29 16:17:49 +0200 | [diff] [blame] | 207 | probe_ok: |
Florian Fainelli | bc49c28 | 2010-09-12 15:52:59 +0200 | [diff] [blame] | 208 | bcm963xx_mtd_info->owner = THIS_MODULE; |
| 209 | |
| 210 | /* This is mutually exclusive */ |
| 211 | if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0) { |
| 212 | dev_info(&pdev->dev, "CFE bootloader detected\n"); |
| 213 | if (parsed_nr_parts == 0) { |
| 214 | int ret = parse_cfe_partitions(bcm963xx_mtd_info, |
| 215 | &parsed_parts); |
| 216 | if (ret > 0) { |
| 217 | part_type = "CFE"; |
| 218 | parsed_nr_parts = ret; |
| 219 | } |
| 220 | } |
| 221 | } else { |
| 222 | dev_info(&pdev->dev, "unsupported bootloader\n"); |
| 223 | err = -ENODEV; |
| 224 | goto err_probe; |
| 225 | } |
| 226 | |
| 227 | return add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, |
| 228 | parsed_nr_parts); |
| 229 | |
| 230 | err_probe: |
| 231 | iounmap(bcm963xx_map.virt); |
| 232 | return err; |
| 233 | } |
| 234 | |
| 235 | static int bcm963xx_remove(struct platform_device *pdev) |
| 236 | { |
| 237 | if (bcm963xx_mtd_info) { |
| 238 | del_mtd_partitions(bcm963xx_mtd_info); |
| 239 | map_destroy(bcm963xx_mtd_info); |
| 240 | } |
| 241 | |
| 242 | if (bcm963xx_map.virt) { |
| 243 | iounmap(bcm963xx_map.virt); |
| 244 | bcm963xx_map.virt = 0; |
| 245 | } |
| 246 | |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | static struct platform_driver bcm63xx_mtd_dev = { |
| 251 | .probe = bcm963xx_probe, |
| 252 | .remove = bcm963xx_remove, |
| 253 | .driver = { |
| 254 | .name = "bcm963xx-flash", |
| 255 | .owner = THIS_MODULE, |
| 256 | }, |
| 257 | }; |
| 258 | |
| 259 | static int __init bcm963xx_mtd_init(void) |
| 260 | { |
| 261 | return platform_driver_register(&bcm63xx_mtd_dev); |
| 262 | } |
| 263 | |
| 264 | static void __exit bcm963xx_mtd_exit(void) |
| 265 | { |
| 266 | platform_driver_unregister(&bcm63xx_mtd_dev); |
| 267 | } |
| 268 | |
| 269 | module_init(bcm963xx_mtd_init); |
| 270 | module_exit(bcm963xx_mtd_exit); |
| 271 | |
| 272 | MODULE_LICENSE("GPL"); |
| 273 | MODULE_DESCRIPTION("Broadcom BCM63xx MTD driver for CFE and RedBoot"); |
| 274 | MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>"); |
| 275 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); |
| 276 | MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>"); |