target/linux/brcm47xx/patches-3.3/027-mtd-bcm47xx-add-serial-flash-driver.patch

   1 --- a/drivers/mtd/maps/Kconfig
   2 +++ b/drivers/mtd/maps/Kconfig
   3 @@ -257,6 +257,15 @@ config MTD_BCM47XX_PFLASH
   4         help
   5           Support for bcm47xx parallel flash
   6
   7 +config MTD_BCM47XX_SFLASH
   8 +       tristate "bcm47xx serial flash support"
   9 +       default y
  10 +       depends on BCM47XX
  11 +       select MTD_PARTITIONS
  12 +       select MTD_BCM47XX_PARTS
  13 +       help
  14 +         Support for bcm47xx parallel flash
  15 +
  16  config MTD_DILNETPC
  17         tristate "CFI Flash device mapped on DIL/Net PC"
  18         depends on X86 && MTD_CFI_INTELEXT && BROKEN
  19 --- a/drivers/mtd/maps/Makefile
  20 +++ b/drivers/mtd/maps/Makefile
  21 @@ -58,3 +58,4 @@ obj-$(CONFIG_MTD_GPIO_ADDR)   += gpio-addr
  22  obj-$(CONFIG_MTD_LATCH_ADDR)   += latch-addr-flash.o
  23  obj-$(CONFIG_MTD_LANTIQ)       += lantiq-flash.o
  24  obj-$(CONFIG_MTD_BCM47XX_PFLASH)+= bcm47xx-pflash.o
  25 +obj-$(CONFIG_MTD_BCM47XX_SFLASH)+= bcm47xx-sflash.o
  26 --- /dev/null
  27 +++ b/drivers/mtd/maps/bcm47xx-sflash.c
  28 @@ -0,0 +1,263 @@
  29 +/*
  30 + * Broadcom SiliconBackplane chipcommon serial flash interface
  31 + *
  32 + * Copyright 2011, 2012, Hauke Mehrtens <hauke@hauke-m.de>
  33 + * Copyright 2006, Broadcom Corporation
  34 + * All Rights Reserved.
  35 + *
  36 + * Licensed under the GNU/GPL. See COPYING for details.
  37 + */
  38 +
  39 +#define pr_fmt(fmt) "bcm47xx_sflash: " fmt
  40 +#include <linux/module.h>
  41 +#include <linux/slab.h>
  42 +#include <linux/ioport.h>
  43 +#include <linux/sched.h>
  44 +#include <linux/mtd/mtd.h>
  45 +#include <linux/mtd/map.h>
  46 +#include <linux/mtd/partitions.h>
  47 +#include <linux/errno.h>
  48 +#include <linux/delay.h>
  49 +#include <linux/platform_device.h>
  50 +#include <bcm47xx.h>
  51 +#include <bus.h>
  52 +
  53 +static int
  54 +sflash_mtd_poll(struct bcm47xx_sflash *sflash, unsigned int offset, int timeout)
  55 +{
  56 +       unsigned long now = jiffies;
  57 +
  58 +       for (;;) {
  59 +               if (!sflash->poll(sflash, offset)) {
  60 +                       break;
  61 +               }
  62 +               if (time_after(jiffies, now + timeout)) {
  63 +                       pr_err("timeout while polling\n");
  64 +                       return -ETIMEDOUT;
  65 +
  66 +               }
  67 +               cpu_relax();
  68 +               udelay(1);
  69 +       }
  70 +
  71 +       return 0;
  72 +}
  73 +
  74 +static int
  75 +sflash_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
  76 +{
  77 +       struct bcm47xx_sflash *sflash = (struct bcm47xx_sflash *)mtd->priv;
  78 +
  79 +       /* Check address range */
  80 +       if (!len)
  81 +               return 0;
  82 +
  83 +       if ((from + len) > mtd->size)
  84 +               return -EINVAL;
  85 +
  86 +       *retlen = 0;
  87 +       while (len) {
  88 +               int ret = sflash->read(sflash, from, len, buf);
  89 +               if (ret < 0)
  90 +                       return ret;
  91 +
  92 +               from += (loff_t) ret;
  93 +               len -= ret;
  94 +               buf += ret;
  95 +               *retlen += ret;
  96 +       }
  97 +
  98 +       return 0;
  99 +}
 100 +
 101 +static int
 102 +sflash_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
 103 +{
 104 +       int bytes;
 105 +       int ret;
 106 +       struct bcm47xx_sflash *sflash = (struct bcm47xx_sflash *)mtd->priv;
 107 +
 108 +       /* Check address range */
 109 +       if (!len)
 110 +               return 0;
 111 +
 112 +       if ((to + len) > mtd->size)
 113 +               return -EINVAL;
 114 +
 115 +       *retlen = 0;
 116 +       while (len) {
 117 +               ret = sflash->write(sflash, to, len, buf);
 118 +               if (ret < 0)
 119 +                       return ret;
 120 +
 121 +               bytes = ret;
 122 +
 123 +               ret = sflash_mtd_poll(sflash, (unsigned int) to, HZ / 10);
 124 +               if (ret)
 125 +                       return ret;
 126 +
 127 +               to += (loff_t) bytes;
 128 +               len -= bytes;
 129 +               buf += bytes;
 130 +               *retlen += bytes;
 131 +       }
 132 +
 133 +       return 0;
 134 +}
 135 +
 136 +static int
 137 +sflash_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
 138 +{
 139 +       struct bcm47xx_sflash *sflash = (struct bcm47xx_sflash *) mtd->priv;
 140 +       int i, j, ret = 0;
 141 +       unsigned int addr, len;
 142 +
 143 +       /* Check address range */
 144 +       if (!erase->len)
 145 +               return 0;
 146 +       if ((erase->addr + erase->len) > mtd->size)
 147 +               return -EINVAL;
 148 +
 149 +       addr = erase->addr;
 150 +       len = erase->len;
 151 +
 152 +       /* Ensure that requested regions are aligned */
 153 +       for (i = 0; i < mtd->numeraseregions; i++) {
 154 +               for (j = 0; j < mtd->eraseregions[i].numblocks; j++) {
 155 +                       if (addr == mtd->eraseregions[i].offset +
 156 +                                       mtd->eraseregions[i].erasesize * j &&
 157 +                           len >= mtd->eraseregions[i].erasesize) {
 158 +                               ret = sflash->erase(sflash, addr);
 159 +                               if (ret < 0)
 160 +                                       break;
 161 +                               ret = sflash_mtd_poll(sflash, addr, 10 * HZ);
 162 +                               if (ret)
 163 +                                       break;
 164 +                               addr += mtd->eraseregions[i].erasesize;
 165 +                               len -= mtd->eraseregions[i].erasesize;
 166 +                       }
 167 +               }
 168 +               if (ret)
 169 +                       break;
 170 +       }
 171 +
 172 +       /* Set erase status */
 173 +       if (ret)
 174 +               erase->state = MTD_ERASE_FAILED;
 175 +       else
 176 +               erase->state = MTD_ERASE_DONE;
 177 +
 178 +       /* Call erase callback */
 179 +       if (erase->callback)
 180 +               erase->callback(erase);
 181 +
 182 +       return ret;
 183 +}
 184 +
 185 +static const char *probes[] = { "bcm47xx", NULL };
 186 +
 187 +static int bcm47xx_sflash_probe(struct platform_device *pdev)
 188 +{
 189 +       struct bcm47xx_sflash *sflash = dev_get_platdata(&pdev->dev);
 190 +       struct mtd_info *mtd;
 191 +       struct mtd_erase_region_info *eraseregions;
 192 +       int ret = 0;
 193 +
 194 +       mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
 195 +       if (!mtd){
 196 +               ret =  -ENOMEM;
 197 +               goto err_out;
 198 +       }
 199 +
 200 +       eraseregions = kzalloc(sizeof(struct mtd_erase_region_info), GFP_KERNEL);
 201 +       if (!eraseregions) {
 202 +               ret =  -ENOMEM;
 203 +               goto err_free_mtd;
 204 +       }
 205 +
 206 +       pr_info("found serial flash: blocksize=%dKB, numblocks=%d, size=%dKB\n",
 207 +               sflash->blocksize / 1024, sflash->numblocks, sflash->size / 1024);
 208 +
 209 +       /* Setup region info */
 210 +       eraseregions->offset = 0;
 211 +       eraseregions->erasesize = sflash->blocksize;
 212 +       eraseregions->numblocks = sflash->numblocks;
 213 +       if (eraseregions->erasesize > mtd->erasesize)
 214 +               mtd->erasesize = eraseregions->erasesize;
 215 +       mtd->size = sflash->size;
 216 +       mtd->numeraseregions = 1;
 217 +
 218 +       /* Register with MTD */
 219 +       mtd->name = "bcm47xx-sflash";
 220 +       mtd->type = MTD_NORFLASH;
 221 +       mtd->flags = MTD_CAP_NORFLASH;
 222 +       mtd->eraseregions = eraseregions;
 223 +       mtd->erase = sflash_mtd_erase;
 224 +       mtd->read = sflash_mtd_read;
 225 +       mtd->write = sflash_mtd_write;
 226 +       mtd->writesize = 1;
 227 +       mtd->priv = sflash;
 228 +       ret = dev_set_drvdata(&pdev->dev, mtd);
 229 +       mtd->owner = THIS_MODULE;
 230 +       if (ret) {
 231 +               pr_err("adding private data failed\n");
 232 +               goto err_free_eraseregions;
 233 +       }
 234 +
 235 +       ret = mtd_device_parse_register(mtd, probes, NULL, NULL, 0);
 236 +
 237 +       if (ret) {
 238 +               pr_err("mtd_device_register failed\n");
 239 +               goto err_free_eraseregions;
 240 +       }
 241 +       return 0;
 242 +
 243 +err_free_eraseregions:
 244 +       kfree(eraseregions);
 245 +err_free_mtd:
 246 +       kfree(mtd);
 247 +err_out:
 248 +       return ret;
 249 +}
 250 +
 251 +static int __devexit bcm47xx_sflash_remove(struct platform_device *pdev)
 252 +{
 253 +       struct mtd_info *mtd = dev_get_drvdata(&pdev->dev);
 254 +
 255 +       if (mtd) {
 256 +               mtd_device_unregister(mtd);
 257 +               map_destroy(mtd);
 258 +               kfree(mtd->eraseregions);
 259 +               kfree(mtd);
 260 +               dev_set_drvdata(&pdev->dev, NULL);
 261 +       }
 262 +       return 0;
 263 +}
 264 +
 265 +static struct platform_driver bcm47xx_sflash_driver = {
 266 +       .remove = __devexit_p(bcm47xx_sflash_remove),
 267 +       .driver = {
 268 +               .name = "bcm47xx_sflash",
 269 +               .owner = THIS_MODULE,
 270 +       },
 271 +};
 272 +
 273 +static int __init init_bcm47xx_sflash(void)
 274 +{
 275 +       int ret = platform_driver_probe(&bcm47xx_sflash_driver, bcm47xx_sflash_probe);
 276 +
 277 +       if (ret)
 278 +               pr_err("error registering platform driver: %i\n", ret);
 279 +       return ret;
 280 +}
 281 +
 282 +static void __exit exit_bcm47xx_sflash(void)
 283 +{
 284 +       platform_driver_unregister(&bcm47xx_sflash_driver);
 285 +}
 286 +
 287 +module_init(init_bcm47xx_sflash);
 288 +module_exit(exit_bcm47xx_sflash);
 289 +
 290 +MODULE_LICENSE("GPL");
 291 +MODULE_DESCRIPTION("BCM47XX parallel flash driver");