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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
34#define BCM63XX_EXTENDED_SIZE 0xBFC00000
35
36#define PFX KBUILD_MODNAME ": "
37
38static struct mtd_partition *parsed_parts;
39
40static struct mtd_info *bcm963xx_mtd_info;
41
42static struct map_info bcm963xx_map = {
43 .name = "bcm963xx",
44 .bankwidth = BCM63XX_BUSWIDTH,
45};
46
47static int parse_cfe_partitions(struct mtd_info *master,
48 struct mtd_partition **pparts)
49{
50
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
64 buf = vmalloc(sizeof(struct bcm_tag));
65 if (!buf)
66 return -ENOMEM;
67
68
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
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
103 parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
104 if (!parts) {
105 vfree(buf);
106 return -ENOMEM;
107 };
108
109
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
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
155static 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
170static 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");
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");
203 err = -EIO;
204 goto err_probe;
205 }
206
207probe_ok:
208 bcm963xx_mtd_info->owner = THIS_MODULE;
209
210
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
230err_probe:
231 iounmap(bcm963xx_map.virt);
232 return err;
233}
234
235static 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
250static 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
259static int __init bcm963xx_mtd_init(void)
260{
261 return platform_driver_register(&bcm63xx_mtd_dev);
262}
263
264static void __exit bcm963xx_mtd_exit(void)
265{
266 platform_driver_unregister(&bcm63xx_mtd_dev);
267}
268
269module_init(bcm963xx_mtd_init);
270module_exit(bcm963xx_mtd_exit);
271
272MODULE_LICENSE("GPL");
273MODULE_DESCRIPTION("Broadcom BCM63xx MTD driver for CFE and RedBoot");
274MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
275MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
276MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");
277
