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>
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.
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.
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
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23 #include <linux/init.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/module.h>
27 #include <linux/mtd/map.h>
28 #include <linux/mtd/mtd.h>
29 #include <linux/mtd/partitions.h>
30 #include <linux/vmalloc.h>
31 #include <linux/platform_device.h>
34 #include <asm/mach-bcm63xx/bcm963xx_tag.h>
36 #define BCM63XX_BUSWIDTH 2 /* Buswidth */
37 #define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */
39 static struct mtd_partition *parsed_parts;
41 static struct mtd_info *bcm963xx_mtd_info;
43 static struct map_info bcm963xx_map = {
45 .bankwidth = BCM63XX_BUSWIDTH,
48 static int parse_cfe_partitions(struct mtd_info *master,
49 struct mtd_partition **pparts)
51 /* CFE, NVRAM and global Linux are always present */
52 int nrparts = 3, curpart = 0;
54 struct mtd_partition *parts;
57 unsigned int rootfsaddr, kerneladdr, spareaddr;
58 unsigned int rootfslen, kernellen, sparelen, totallen;
64 /* Allocate memory for buffer */
65 buf = vmalloc(sizeof(struct bcm_tag));
70 ret = master->read(master, master->erasesize, sizeof(struct bcm_tag),
71 &retlen, (void *)buf);
72 if (retlen != sizeof(struct bcm_tag)) {
77 sscanf(buf->kernel_address, "%u", &kerneladdr);
78 sscanf(buf->kernel_length, "%u", &kernellen);
79 sscanf(buf->total_length, "%u", &totallen);
80 tagversion = &(buf->tag_version[0]);
81 boardid = &(buf->board_id[0]);
83 pr_info("CFE boot tag found with version %s and board type %s\n",
86 kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
87 rootfsaddr = kerneladdr + kernellen;
88 spareaddr = roundup(totallen, master->erasesize) + master->erasesize;
89 sparelen = master->size - spareaddr - master->erasesize;
90 rootfslen = spareaddr - rootfsaddr;
92 /* Determine number of partitions */
103 /* Ask kernel for more memory */
104 parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
110 /* Start building partition list */
111 parts[curpart].name = "CFE";
112 parts[curpart].offset = 0;
113 parts[curpart].size = master->erasesize;
117 parts[curpart].name = "kernel";
118 parts[curpart].offset = kerneladdr;
119 parts[curpart].size = kernellen;
124 parts[curpart].name = "rootfs";
125 parts[curpart].offset = rootfsaddr;
126 parts[curpart].size = rootfslen;
128 parts[curpart].size += sparelen;
132 parts[curpart].name = "nvram";
133 parts[curpart].offset = master->size - master->erasesize;
134 parts[curpart].size = master->erasesize;
136 /* Global partition "linux" to make easy firmware upgrade */
138 parts[curpart].name = "linux";
139 parts[curpart].offset = parts[0].size;
140 parts[curpart].size = master->size - parts[0].size - parts[3].size;
142 for (i = 0; i < nrparts; i++)
143 pr_info("Partition %d is %s offset %lx and length %lx\n", i,
144 parts[i].name, (long unsigned int)(parts[i].offset),
145 (long unsigned int)(parts[i].size));
147 pr_info("Spare partition is offset %x and length %x\n", spareaddr,
156 static int bcm963xx_detect_cfe(struct mtd_info *master)
158 int idoffset = 0x4e0;
159 static char idstring[8] = "CFE1CFE1";
164 ret = master->read(master, idoffset, 8, &retlen, (void *)buf);
166 printk(KERN_INFO PFX "Read Signature value of %s\n", buf);
168 return strncmp(idstring, buf, 8);
171 static int bcm963xx_probe(struct platform_device *pdev)
174 int parsed_nr_parts = 0;
178 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
180 dev_err(&pdev->dev, "no resource supplied\n");
184 bcm963xx_map.phys = r->start;
185 bcm963xx_map.size = resource_size(r);
186 bcm963xx_map.virt = ioremap(r->start, resource_size(r));
187 if (!bcm963xx_map.virt) {
188 dev_err(&pdev->dev, "failed to ioremap\n");
192 dev_info(&pdev->dev, "0x%08lx at 0x%08x\n",
193 bcm963xx_map.size, bcm963xx_map.phys);
195 simple_map_init(&bcm963xx_map);
197 bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map);
198 if (!bcm963xx_mtd_info) {
199 dev_err(&pdev->dev, "failed to probe using CFI\n");
200 bcm963xx_mtd_info = do_map_probe("jedec_probe", &bcm963xx_map);
201 if (bcm963xx_mtd_info)
203 dev_err(&pdev->dev, "failed to probe using JEDEC\n");
209 bcm963xx_mtd_info->owner = THIS_MODULE;
211 /* This is mutually exclusive */
212 if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0) {
213 dev_info(&pdev->dev, "CFE bootloader detected\n");
214 if (parsed_nr_parts == 0) {
215 int ret = parse_cfe_partitions(bcm963xx_mtd_info,
219 parsed_nr_parts = ret;
223 dev_info(&pdev->dev, "unsupported bootloader\n");
228 return mtd_device_register(bcm963xx_mtd_info, parsed_parts,
232 iounmap(bcm963xx_map.virt);
236 static int bcm963xx_remove(struct platform_device *pdev)
238 if (bcm963xx_mtd_info) {
239 mtd_device_unregister(bcm963xx_mtd_info);
240 map_destroy(bcm963xx_mtd_info);
243 if (bcm963xx_map.virt) {
244 iounmap(bcm963xx_map.virt);
245 bcm963xx_map.virt = 0;
251 static struct platform_driver bcm63xx_mtd_dev = {
252 .probe = bcm963xx_probe,
253 .remove = bcm963xx_remove,
255 .name = "bcm963xx-flash",
256 .owner = THIS_MODULE,
260 module_platform_driver(bcm63xx_mtd_dev);
262 MODULE_LICENSE("GPL");
263 MODULE_DESCRIPTION("Broadcom BCM63xx MTD driver for CFE and RedBoot");
264 MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
265 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
266 MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");