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 *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
  27         return len;
  28 }
  29
  30 static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
  31 {
  32         struct mtd_info *mtd = &b47s->mtd;
  33
  34         mtd->priv = b47s;
  35         mtd->name = "bcm47xxsflash";
  36         mtd->owner = THIS_MODULE;
  37         mtd->type = MTD_ROM;
  38         mtd->size = b47s->size;
  39         mtd->_read = bcm47xxsflash_read;
  40
  41         /* TODO: implement writing support and verify/change following code */
  42         mtd->flags = MTD_CAP_ROM;
  43         mtd->writebufsize = mtd->writesize = 1;
  44 }
  45
  46 static int bcm47xxsflash_probe(struct platform_device *pdev)
  47 {
  48         struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
  49         struct bcm47xxsflash *b47s;
  50         int err;
  51
  52         b47s = kzalloc(sizeof(*b47s), GFP_KERNEL);
  53         if (!b47s) {
  54                 err = -ENOMEM;
  55                 goto out;
  56         }
  57         sflash->priv = b47s;
  58
  59         b47s->window = sflash->window;
  60         b47s->blocksize = sflash->blocksize;
  61         b47s->numblocks = sflash->numblocks;
  62         b47s->size = sflash->size;
  63         bcm47xxsflash_fill_mtd(b47s);
  64
  65         err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);
  66         if (err) {
  67                 pr_err("Failed to register MTD device: %d\n", err);
  68                 goto err_dev_reg;
  69         }
  70
  71         return 0;
  72
  73 err_dev_reg:
  74         kfree(&b47s->mtd);
  75 out:
  76         return err;
  77 }
  78
  79 static int bcm47xxsflash_remove(struct platform_device *pdev)
  80 {
  81         struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
  82         struct bcm47xxsflash *b47s = sflash->priv;
  83
  84         mtd_device_unregister(&b47s->mtd);
  85         kfree(b47s);
  86
  87         return 0;
  88 }
  89
  90 static struct platform_driver bcma_sflash_driver = {
  91         .remove = bcm47xxsflash_remove,
  92         .driver = {
  93                 .name = "bcma_sflash",
  94                 .owner = THIS_MODULE,
  95         },
  96 };
  97
  98 static int __init bcm47xxsflash_init(void)
  99 {
 100         int err;
 101
 102         err = platform_driver_probe(&bcma_sflash_driver, bcm47xxsflash_probe);
 103         if (err)
 104                 pr_err("Failed to register BCMA serial flash driver: %d\n",
 105                        err);
 106
 107         return err;
 108 }
 109
 110 static void __exit bcm47xxsflash_exit(void)
 111 {
 112         platform_driver_unregister(&bcma_sflash_driver);
 113 }
 114
 115 module_init(bcm47xxsflash_init);
 116 module_exit(bcm47xxsflash_exit);