drivers/mtd/devices/bcm47xxsflash.c

   1 #include <linux/kernel.h>
   2 #include <linux/module.h>
   3 #include <linux/slab.h>
   4 #include <linux/mtd/mtd.h>
   5 #include <linux/platform_device.h>
   6 #include <linux/bcma/bcma.h>
   7
   8 #include "bcm47xxsflash.h"
   9
  10 MODULE_LICENSE("GPL");
  11 MODULE_DESCRIPTION("Serial flash driver for BCMA bus");
  12
  13 static const char * const probes[] = { "bcm47xxpart", NULL };
  14
  15 static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,
  16                               size_t *retlen, u_char *buf)
  17 {
  18         struct bcm47xxsflash *b47s = mtd->priv;
  19
  20         /* Check address range */
  21         if ((from + len) > mtd->size)
  22                 return -EINVAL;
  23
  24         memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
  25                       len);
  26         *retlen = len;
  27
  28         return len;
  29 }
  30
  31 static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
  32 {
  33         struct mtd_info *mtd = &b47s->mtd;
  34
  35         mtd->priv = b47s;
  36         mtd->name = "bcm47xxsflash";
  37         mtd->owner = THIS_MODULE;
  38         mtd->type = MTD_ROM;
  39         mtd->size = b47s->size;
  40         mtd->_read = bcm47xxsflash_read;
  41
  42         /* TODO: implement writing support and verify/change following code */
  43         mtd->flags = MTD_CAP_ROM;
  44         mtd->writebufsize = mtd->writesize = 1;
  45 }
  46
  47 /**************************************************
  48  * BCMA
  49  **************************************************/
  50
  51 static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
  52 {
  53         struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
  54         struct bcm47xxsflash *b47s;
  55         int err;
  56
  57         b47s = kzalloc(sizeof(*b47s), GFP_KERNEL);
  58         if (!b47s) {
  59                 err = -ENOMEM;
  60                 goto out;
  61         }
  62         sflash->priv = b47s;
  63
  64         b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash);
  65
  66         switch (b47s->bcma_cc->capabilities & BCMA_CC_CAP_FLASHT) {
  67         case BCMA_CC_FLASHT_STSER:
  68                 b47s->type = BCM47XXSFLASH_TYPE_ST;
  69                 break;
  70         case BCMA_CC_FLASHT_ATSER:
  71                 b47s->type = BCM47XXSFLASH_TYPE_ATMEL;
  72                 break;
  73         }
  74
  75         b47s->window = sflash->window;
  76         b47s->blocksize = sflash->blocksize;
  77         b47s->numblocks = sflash->numblocks;
  78         b47s->size = sflash->size;
  79         bcm47xxsflash_fill_mtd(b47s);
  80
  81         err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);
  82         if (err) {
  83                 pr_err("Failed to register MTD device: %d\n", err);
  84                 goto err_dev_reg;
  85         }
  86
  87         return 0;
  88
  89 err_dev_reg:
  90         kfree(&b47s->mtd);
  91 out:
  92         return err;
  93 }
  94
  95 static int bcm47xxsflash_bcma_remove(struct platform_device *pdev)
  96 {
  97         struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
  98         struct bcm47xxsflash *b47s = sflash->priv;
  99
 100         mtd_device_unregister(&b47s->mtd);
 101         kfree(b47s);
 102
 103         return 0;
 104 }
 105
 106 static struct platform_driver bcma_sflash_driver = {
 107         .probe  = bcm47xxsflash_bcma_probe,
 108         .remove = bcm47xxsflash_bcma_remove,
 109         .driver = {
 110                 .name = "bcma_sflash",
 111                 .owner = THIS_MODULE,
 112         },
 113 };
 114
 115 /**************************************************
 116  * Init
 117  **************************************************/
 118
 119 static int __init bcm47xxsflash_init(void)
 120 {
 121         int err;
 122
 123         err = platform_driver_register(&bcma_sflash_driver);
 124         if (err)
 125                 pr_err("Failed to register BCMA serial flash driver: %d\n",
 126                        err);
 127
 128         return err;
 129 }
 130
 131 static void __exit bcm47xxsflash_exit(void)
 132 {
 133         platform_driver_unregister(&bcma_sflash_driver);
 134 }
 135
 136 module_init(bcm47xxsflash_init);
 137 module_exit(bcm47xxsflash_exit);