9543c172a4e8838f774fdefe51450213d3016040
[openwrt.git] / target / linux / brcm63xx / files / drivers / mtd / maps / bcm963xx-flash.c
1 /*
2  * $Id$
3  * Copyright (C) 2006  Florian Fainelli <florian@openwrt.org>
4  *                      Mike Albon <malbon@openwrt.org>
5  * Copyright (C) $Date$  $Author$
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
20  */
21
22 /* This is the BCM963xx flash map driver, in its actual state it only supports BCM96348 devices
23  * this driver is able to manage both bootloader we found on these boards : CFE and RedBoot
24  *
25  * RedBoot :
26  *  - this bootloader allows us to parse partitions and therefore deduce the MTD partition table
27  *
28  * CFE :
29  *   - CFE partitionning can be detected as for BCM947xx devices 
30  *
31  */
32
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/mtd/map.h>
36 #include <linux/mtd/mtd.h>
37 #include <linux/mtd/partitions.h>
38 #include <linux/vmalloc.h>
39
40 #include <asm/io.h>
41
42 #define WINDOW_ADDR 0x1FC00000         /* Real address of the flash */
43 #define WINDOW_SIZE 0x400000           /* Size of flash */
44 #define BUSWIDTH 2                     /* Buswidth */
45 #define EXTENDED_SIZE 0xBFC00000       /* Extended flash address */
46 #define IMAGE_LEN 10                   /* Length of Length Field */
47 #define ADDRESS_LEN 12                 /* Length of Address field */
48 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
49
50 extern int boot_loader_type;           /* For RedBoot / CFE detection */
51 extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts, unsigned long fis_origin);
52 static struct mtd_partition *parsed_parts;
53
54 static void __exit bcm963xx_mtd_cleanup(void);
55
56 static struct mtd_info *bcm963xx_mtd_info;
57
58 static struct map_info bcm963xx_map = {
59        .name = "bcm963xx",
60        .size = WINDOW_SIZE,
61        .bankwidth = BUSWIDTH,
62        .phys = WINDOW_ADDR,
63 };
64
65
66 int parse_cfe_partitions( struct mtd_info *master, struct mtd_partition **pparts)
67 {
68        int nrparts = 2, curpart = 0; // CFE and NVRAM always present.
69        struct bcm963xx_cfe_map {
70        unsigned char tagVersion[4];                            // Version of the image tag
71        unsigned char sig_1[20];                                // Company Line 1
72        unsigned char sig_2[14];                                // Company Line 2
73        unsigned char chipid[6];                                        // Chip this image is for
74        unsigned char boardid[16];                              // Board name
75        unsigned char bigEndian[2];                             // Map endianness -- 1 BE 0 LE
76        unsigned char totalLength[IMAGE_LEN];           //Total length of image
77        unsigned char cfeAddress[ADDRESS_LEN];  // Address in memory of CFE
78        unsigned char cfeLength[IMAGE_LEN];             // Size of CFE
79        unsigned char rootAddress[ADDRESS_LEN];         // Address in memory of rootfs
80        unsigned char rootLength[IMAGE_LEN];            // Size of rootfs
81        unsigned char kernelAddress[ADDRESS_LEN];       // Address in memory of kernel
82        unsigned char kernelLength[IMAGE_LEN];  // Size of kernel
83        unsigned char dualImage[2];                             // Unused at present
84        unsigned char inactiveFlag[2];                  // Unused at present
85        unsigned char reserved1[74];                            // Reserved area not in use
86        unsigned char imageCRC[4];                              // CRC32 of images
87        unsigned char reserved2[16];                            // Unused at present
88        unsigned char headerCRC[4];                             // CRC32 of header excluding tagVersion
89        unsigned char reserved3[16];                            // Unused at present
90        } *buf;
91        struct mtd_partition *parts;
92        int ret;
93        size_t retlen;
94        unsigned int rootfsaddr, kerneladdr, spareaddr;
95        unsigned int rootfslen, kernellen, sparelen, totallen;
96        int namelen = 0;
97        int i;
98        // Allocate memory for buffer
99        buf = vmalloc(sizeof(struct bcm963xx_cfe_map));
100
101        if (!buf)
102                return -ENOMEM;
103
104        // Get the tag
105        ret = master->read(master,master->erasesize,sizeof(struct bcm963xx_cfe_map), &retlen, (void *)buf);
106        if (retlen != sizeof(struct bcm963xx_cfe_map)){
107                vfree(buf);
108                return -EIO;
109        };
110        printk("bcm963xx: CFE boot tag found with version %s and board type %s.\n",buf->tagVersion,buf->boardid);
111        // Get the values and calculate
112        sscanf(buf->rootAddress,"%u", &rootfsaddr);
113        rootfsaddr = rootfsaddr - EXTENDED_SIZE;
114        sscanf(buf->rootLength, "%u", &rootfslen);
115        sscanf(buf->kernelAddress, "%u", &kerneladdr);
116        kerneladdr = kerneladdr - EXTENDED_SIZE;
117        sscanf(buf->kernelLength, "%u", &kernellen);
118        sscanf(buf->totalLength, "%u", &totallen);
119        spareaddr = ROUNDUP(totallen,master->erasesize) + master->erasesize;
120        sparelen = master->size - spareaddr - master->erasesize;
121        // Determine number of partitions
122        namelen = 8;
123        if (rootfslen > 0){
124                nrparts++;
125                namelen =+ 6;
126        };
127        if (kernellen > 0){
128                nrparts++;
129                namelen =+ 6;
130        };
131        // Ask kernel for more memory.
132        parts = kmalloc(sizeof(*parts)*nrparts+10*nrparts, GFP_KERNEL);
133        if (!parts){
134                vfree(buf);
135                return -ENOMEM;
136        };
137        memset(parts,0,sizeof(*parts)*nrparts+10*nrparts);
138        // Start building partition list
139        parts[curpart].name = "CFE";
140        parts[curpart].offset = 0;
141        parts[curpart].size = master->erasesize;
142        curpart++;
143        if (kernellen > 0){
144                parts[curpart].name = "kernel";
145                parts[curpart].offset = kerneladdr;
146                parts[curpart].size = kernellen;
147                curpart++;
148        };
149        if (rootfslen > 0){
150                parts[curpart].name = "rootfs";
151                parts[curpart].offset = rootfsaddr;
152                parts[curpart].size = rootfslen;
153                if (sparelen > 0)
154                        parts[curpart].size += sparelen;
155                curpart++;
156        };
157        parts[curpart].name = "nvram";
158        parts[curpart].offset = master->size - master->erasesize;
159        parts[curpart].size = master->erasesize;
160        for (i = 0; i < nrparts; i++) {
161           printk("bcm963xx: Partition %d is %s offset %x and length %x\n", i, parts[i].name, parts[i].offset, parts[i].size);
162        }
163        *pparts = parts;
164        vfree(buf);
165        return nrparts;
166 };
167
168 static struct mtd_partition bcm963xx_parts[] = {
169         { name: "bootloader",  size: 0,        offset: 0,      mask_flags: MTD_WRITEABLE },
170         { name: "rootfs",              size: 0,        offset: 0},
171         { name: "jffs2",        size: 5 * 0x10000,      offset: 57*0x10000}
172 };
173
174 static int bcm963xx_parts_size = sizeof(bcm963xx_parts) / sizeof(bcm963xx_parts[0]);
175
176 static int bcm963xx_detect_cfe(struct mtd_info *master)
177 {
178        int idoffset = 0x4e0;
179        static char idstring[8] = "CFE1CFE1";
180        char buf[9];
181        int ret;
182        size_t retlen;
183
184        ret = master->read(master, idoffset, 8, &retlen, (void *)buf);
185        buf[retlen] = 0;
186        printk("bcm963xx: Read Signature value of %s\n", buf);
187        return strncmp(idstring,buf,8);
188 }
189
190 static int __init bcm963xx_mtd_init(void)
191 {
192        printk("bcm963xx: 0x%08x at 0x%08x\n", WINDOW_SIZE, WINDOW_ADDR);
193        bcm963xx_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
194
195        if (!bcm963xx_map.virt) {
196                printk("bcm963xx: Failed to ioremap\n");
197                return -EIO;
198        }
199
200        simple_map_init(&bcm963xx_map);
201
202        bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map);
203
204        if (bcm963xx_mtd_info) {
205                bcm963xx_mtd_info->owner = THIS_MODULE;
206
207                //if (boot_loader_type == BOOT_CFE)
208                if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0)
209                {
210                        int parsed_nr_parts = 0;
211                        char * part_type;
212                        printk("bcm963xx: CFE bootloader detected\n");
213                        //add_mtd_device(bcm963xx_mtd_info);
214                        //add_mtd_partitions(bcm963xx_mtd_info, bcm963xx_parts, bcm963xx_parts_size);
215                        if (parsed_nr_parts == 0) {
216                                int ret = parse_cfe_partitions(bcm963xx_mtd_info, &parsed_parts);
217                                if (ret > 0) {
218                                        part_type = "CFE";
219                                        parsed_nr_parts = ret;
220                                }
221                        }
222                        add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, parsed_nr_parts);
223                        return 0;
224                }
225                else
226                {
227                        int parsed_nr_parts = 0;
228                        char * part_type;
229
230                        if (bcm963xx_mtd_info->size > 0x00400000) {
231                                printk("Support for extended flash memory size : 0x%08X ; ONLY 64MBIT SUPPORT\n", bcm963xx_mtd_info->size);
232                                bcm963xx_map.virt = (unsigned long)(EXTENDED_SIZE);
233                        }
234
235 #ifdef CONFIG_MTD_REDBOOT_PARTS
236                        if (parsed_nr_parts == 0) {
237                                int ret = parse_redboot_partitions(bcm963xx_mtd_info, &parsed_parts, 0);
238                                if (ret > 0) {
239                                        part_type = "RedBoot";
240                                        parsed_nr_parts = ret;
241                                }
242                        }
243 #endif
244                        add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, parsed_nr_parts);
245
246                        return 0;
247                }
248        }
249        iounmap(bcm963xx_map.virt);
250        return -ENXIO;
251 }
252
253 static void __exit bcm963xx_mtd_cleanup(void)
254 {
255        if (bcm963xx_mtd_info) {
256                del_mtd_partitions(bcm963xx_mtd_info);
257                map_destroy(bcm963xx_mtd_info);
258        }
259
260        if (bcm963xx_map.virt) {
261                iounmap(bcm963xx_map.virt);
262                bcm963xx_map.virt = 0;
263        }
264 }
265
266 module_init(bcm963xx_mtd_init);
267 module_exit(bcm963xx_mtd_cleanup);
268
269 MODULE_LICENSE("GPL");
270 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org> Mike Albon <malbon@openwrt.org>");