| 1 | /* |
| 2 | * Broadcom SiliconBackplane chipcommon serial flash interface |
| 3 | * |
| 4 | * Copyright 2006, Broadcom Corporation |
| 5 | * All Rights Reserved. |
| 6 | * |
| 7 | * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY |
| 8 | * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM |
| 9 | * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS |
| 10 | * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE. |
| 11 | * |
| 12 | * $Id$ |
| 13 | */ |
| 14 | |
| 15 | #include <linux/config.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/ioport.h> |
| 19 | #include <linux/mtd/compatmac.h> |
| 20 | #include <linux/mtd/mtd.h> |
| 21 | #include <linux/mtd/partitions.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/pci.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <asm/io.h> |
| 26 | |
| 27 | #include <typedefs.h> |
| 28 | #include <osl.h> |
| 29 | // #include <bcmutils.h> |
| 30 | #include <bcmdevs.h> |
| 31 | #include <bcmnvram.h> |
| 32 | #include <sbutils.h> |
| 33 | #include <sbconfig.h> |
| 34 | #include <sbchipc.h> |
| 35 | #include <sflash.h> |
| 36 | |
| 37 | #ifdef CONFIG_MTD_PARTITIONS |
| 38 | extern struct mtd_partition * init_mtd_partitions(struct mtd_info *mtd, size_t size); |
| 39 | #endif |
| 40 | |
| 41 | struct sflash_mtd { |
| 42 | sb_t *sbh; |
| 43 | chipcregs_t *cc; |
| 44 | struct semaphore lock; |
| 45 | struct mtd_info mtd; |
| 46 | struct mtd_erase_region_info region; |
| 47 | }; |
| 48 | |
| 49 | /* Private global state */ |
| 50 | static struct sflash_mtd sflash; |
| 51 | |
| 52 | static int |
| 53 | sflash_mtd_poll(struct sflash_mtd *sflash, unsigned int offset, int timeout) |
| 54 | { |
| 55 | int now = jiffies; |
| 56 | int ret = 0; |
| 57 | |
| 58 | for (;;) { |
| 59 | if (!sflash_poll(sflash->sbh, sflash->cc, offset)) { |
| 60 | ret = 0; |
| 61 | break; |
| 62 | } |
| 63 | if (time_after(jiffies, now + timeout)) { |
| 64 | printk(KERN_ERR "sflash: timeout\n"); |
| 65 | ret = -ETIMEDOUT; |
| 66 | break; |
| 67 | } |
| 68 | if (current->need_resched) { |
| 69 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 70 | schedule_timeout(timeout / 10); |
| 71 | } else |
| 72 | udelay(1); |
| 73 | } |
| 74 | |
| 75 | return ret; |
| 76 | } |
| 77 | |
| 78 | static int |
| 79 | sflash_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) |
| 80 | { |
| 81 | struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv; |
| 82 | int bytes, ret = 0; |
| 83 | |
| 84 | /* Check address range */ |
| 85 | if (len == 0){ |
| 86 | *retlen = 0; |
| 87 | return 0; |
| 88 | } |
| 89 | if (!len) |
| 90 | return 0; |
| 91 | if ((from + len) > mtd->size) |
| 92 | return -EINVAL; |
| 93 | |
| 94 | down(&sflash->lock); |
| 95 | |
| 96 | *retlen = 0; |
| 97 | while (len) { |
| 98 | if ((bytes = sflash_read(sflash->sbh, sflash->cc, (uint) from, len, buf)) < 0) { |
| 99 | ret = bytes; |
| 100 | break; |
| 101 | } |
| 102 | from += (loff_t) bytes; |
| 103 | len -= bytes; |
| 104 | buf += bytes; |
| 105 | *retlen += bytes; |
| 106 | } |
| 107 | |
| 108 | up(&sflash->lock); |
| 109 | |
| 110 | return ret; |
| 111 | } |
| 112 | |
| 113 | static int |
| 114 | sflash_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) |
| 115 | { |
| 116 | struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv; |
| 117 | int bytes, ret = 0; |
| 118 | |
| 119 | /* Check address range */ |
| 120 | if (len == 0){ |
| 121 | *retlen = 0; |
| 122 | return 0; |
| 123 | } |
| 124 | if (!len) |
| 125 | return 0; |
| 126 | if ((to + len) > mtd->size) |
| 127 | return -EINVAL; |
| 128 | |
| 129 | down(&sflash->lock); |
| 130 | |
| 131 | *retlen = 0; |
| 132 | while (len) { |
| 133 | if ((bytes = sflash_write(sflash->sbh, sflash->cc, (uint)to, (uint)len, buf)) < 0) { |
| 134 | ret = bytes; |
| 135 | break; |
| 136 | } |
| 137 | if ((ret = sflash_mtd_poll(sflash, (unsigned int) to, HZ / 10))) |
| 138 | break; |
| 139 | to += (loff_t) bytes; |
| 140 | len -= bytes; |
| 141 | buf += bytes; |
| 142 | *retlen += bytes; |
| 143 | } |
| 144 | |
| 145 | up(&sflash->lock); |
| 146 | |
| 147 | return ret; |
| 148 | } |
| 149 | |
| 150 | static int |
| 151 | sflash_mtd_erase(struct mtd_info *mtd, struct erase_info *erase) |
| 152 | { |
| 153 | struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv; |
| 154 | int i, j, ret = 0; |
| 155 | unsigned int addr, len; |
| 156 | |
| 157 | /* Check address range */ |
| 158 | if (!erase->len) |
| 159 | return 0; |
| 160 | if ((erase->addr + erase->len) > mtd->size) |
| 161 | return -EINVAL; |
| 162 | |
| 163 | addr = erase->addr; |
| 164 | len = erase->len; |
| 165 | |
| 166 | down(&sflash->lock); |
| 167 | |
| 168 | /* Ensure that requested region is aligned */ |
| 169 | for (i = 0; i < mtd->numeraseregions; i++) { |
| 170 | for (j = 0; j < mtd->eraseregions[i].numblocks; j++) { |
| 171 | if (addr == mtd->eraseregions[i].offset + mtd->eraseregions[i].erasesize * j && |
| 172 | len >= mtd->eraseregions[i].erasesize) { |
| 173 | if ((ret = sflash_erase(sflash->sbh, sflash->cc, addr)) < 0) |
| 174 | break; |
| 175 | if ((ret = sflash_mtd_poll(sflash, addr, 10 * HZ))) |
| 176 | break; |
| 177 | addr += mtd->eraseregions[i].erasesize; |
| 178 | len -= mtd->eraseregions[i].erasesize; |
| 179 | } |
| 180 | } |
| 181 | if (ret) |
| 182 | break; |
| 183 | } |
| 184 | |
| 185 | up(&sflash->lock); |
| 186 | |
| 187 | /* Set erase status */ |
| 188 | if (ret) |
| 189 | erase->state = MTD_ERASE_FAILED; |
| 190 | else |
| 191 | erase->state = MTD_ERASE_DONE; |
| 192 | |
| 193 | /* Call erase callback */ |
| 194 | if (erase->callback) |
| 195 | erase->callback(erase); |
| 196 | |
| 197 | return ret; |
| 198 | } |
| 199 | |
| 200 | #if LINUX_VERSION_CODE < 0x20212 && defined(MODULE) |
| 201 | #define sflash_mtd_init init_module |
| 202 | #define sflash_mtd_exit cleanup_module |
| 203 | #endif |
| 204 | |
| 205 | mod_init_t |
| 206 | sflash_mtd_init(void) |
| 207 | { |
| 208 | struct pci_dev *pdev; |
| 209 | int ret = 0; |
| 210 | struct sflash *info; |
| 211 | uint i; |
| 212 | #ifdef CONFIG_MTD_PARTITIONS |
| 213 | struct mtd_partition *parts; |
| 214 | #endif |
| 215 | |
| 216 | if (!(pdev = pci_find_device(VENDOR_BROADCOM, SB_CC, NULL))) { |
| 217 | printk(KERN_ERR "sflash: chipcommon not found\n"); |
| 218 | return -ENODEV; |
| 219 | } |
| 220 | |
| 221 | memset(&sflash, 0, sizeof(struct sflash_mtd)); |
| 222 | init_MUTEX(&sflash.lock); |
| 223 | |
| 224 | /* attach to the backplane */ |
| 225 | if (!(sflash.sbh = sb_kattach(SB_OSH))) { |
| 226 | printk(KERN_ERR "sflash: error attaching to backplane\n"); |
| 227 | ret = -EIO; |
| 228 | goto fail; |
| 229 | } |
| 230 | |
| 231 | /* Map registers and flash base */ |
| 232 | if (!(sflash.cc = ioremap_nocache(pci_resource_start(pdev, 0), |
| 233 | pci_resource_len(pdev, 0)))) { |
| 234 | printk(KERN_ERR "sflash: error mapping registers\n"); |
| 235 | ret = -EIO; |
| 236 | goto fail; |
| 237 | } |
| 238 | |
| 239 | /* Initialize serial flash access */ |
| 240 | if (!(info = sflash_init(sflash.sbh, sflash.cc))) { |
| 241 | printk(KERN_ERR "sflash: found no supported devices\n"); |
| 242 | ret = -ENODEV; |
| 243 | goto fail; |
| 244 | } |
| 245 | |
| 246 | printk(KERN_INFO "sflash: found serial flash; blocksize=%dKB, numblocks=%d, size=%dKB\n",info->blocksize/1024,info->numblocks,info->size/1024); |
| 247 | |
| 248 | /* Setup region info */ |
| 249 | sflash.region.offset = 0; |
| 250 | sflash.region.erasesize = info->blocksize; |
| 251 | sflash.region.numblocks = info->numblocks; |
| 252 | if (sflash.region.erasesize > sflash.mtd.erasesize) |
| 253 | sflash.mtd.erasesize = sflash.region.erasesize; |
| 254 | sflash.mtd.size = info->size; |
| 255 | sflash.mtd.numeraseregions = 1; |
| 256 | |
| 257 | /* Register with MTD */ |
| 258 | sflash.mtd.name = "sflash"; |
| 259 | sflash.mtd.type = MTD_NORFLASH; |
| 260 | sflash.mtd.flags = MTD_CAP_NORFLASH; |
| 261 | sflash.mtd.eraseregions = &sflash.region; |
| 262 | sflash.mtd.module = THIS_MODULE; |
| 263 | sflash.mtd.erase = sflash_mtd_erase; |
| 264 | sflash.mtd.read = sflash_mtd_read; |
| 265 | sflash.mtd.write = sflash_mtd_write; |
| 266 | sflash.mtd.priv = &sflash; |
| 267 | |
| 268 | #ifdef CONFIG_MTD_PARTITIONS |
| 269 | parts = init_mtd_partitions(&sflash.mtd, sflash.mtd.size); |
| 270 | for (i = 0; parts[i].name; i++); |
| 271 | ret = add_mtd_partitions(&sflash.mtd, parts, i); |
| 272 | #else |
| 273 | ret = add_mtd_device(&sflash.mtd); |
| 274 | #endif |
| 275 | if (ret) { |
| 276 | printk(KERN_ERR "sflash: add_mtd failed\n"); |
| 277 | goto fail; |
| 278 | } |
| 279 | |
| 280 | return 0; |
| 281 | |
| 282 | fail: |
| 283 | if (sflash.cc) |
| 284 | iounmap((void *) sflash.cc); |
| 285 | if (sflash.sbh) |
| 286 | sb_detach(sflash.sbh); |
| 287 | return ret; |
| 288 | } |
| 289 | |
| 290 | mod_exit_t |
| 291 | sflash_mtd_exit(void) |
| 292 | { |
| 293 | #ifdef CONFIG_MTD_PARTITIONS |
| 294 | del_mtd_partitions(&sflash.mtd); |
| 295 | #else |
| 296 | del_mtd_device(&sflash.mtd); |
| 297 | #endif |
| 298 | iounmap((void *) sflash.cc); |
| 299 | sb_detach(sflash.sbh); |
| 300 | } |
| 301 | |
| 302 | module_init(sflash_mtd_init); |
| 303 | module_exit(sflash_mtd_exit); |
| 304 | |
