drivers/mtd/nand/bcm47xxnflash/main.c

   1 /*
   2  * BCM47XX NAND flash driver
   3  *
   4  * Copyright (C) 2012 Rafał Miłecki <zajec5@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include "bcm47xxnflash.h"
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/bcma/bcma.h>
  19
  20 MODULE_DESCRIPTION("NAND flash driver for BCMA bus");
  21 MODULE_LICENSE("GPL");
  22 MODULE_AUTHOR("Rafał Miłecki");
  23
  24 static const char *probes[] = { "bcm47xxpart", NULL };
  25
  26 static int bcm47xxnflash_probe(struct platform_device *pdev)
  27 {
  28         struct bcma_nflash *nflash = dev_get_platdata(&pdev->dev);
  29         struct bcm47xxnflash *b47n;
  30         int err = 0;
  31
  32         b47n = kzalloc(sizeof(*b47n), GFP_KERNEL);
  33         if (!b47n) {
  34                 err = -ENOMEM;
  35                 goto out;
  36         }
  37
  38         b47n->nand_chip.priv = b47n;
  39         b47n->mtd.owner = THIS_MODULE;
  40         b47n->mtd.priv = &b47n->nand_chip; /* Required */
  41         b47n->cc = container_of(nflash, struct bcma_drv_cc, nflash);
  42
  43         if (b47n->cc->core->bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
  44                 err = bcm47xxnflash_ops_bcm4706_init(b47n);
  45         } else {
  46                 pr_err("Device not supported\n");
  47                 err = -ENOTSUPP;
  48         }
  49         if (err) {
  50                 pr_err("Initialization failed: %d\n", err);
  51                 goto err_init;
  52         }
  53
  54         err = mtd_device_parse_register(&b47n->mtd, probes, NULL, NULL, 0);
  55         if (err) {
  56                 pr_err("Failed to register MTD device: %d\n", err);
  57                 goto err_dev_reg;
  58         }
  59
  60         return 0;
  61
  62 err_dev_reg:
  63 err_init:
  64         kfree(b47n);
  65 out:
  66         return err;
  67 }
  68
  69 static int bcm47xxnflash_remove(struct platform_device *pdev)
  70 {
  71         struct bcma_nflash *nflash = dev_get_platdata(&pdev->dev);
  72
  73         if (nflash->mtd)
  74                 mtd_device_unregister(nflash->mtd);
  75
  76         return 0;
  77 }
  78
  79 static struct platform_driver bcm47xxnflash_driver = {
  80         .probe  = bcm47xxnflash_probe,
  81         .remove = bcm47xxnflash_remove,
  82         .driver = {
  83                 .name = "bcma_nflash",
  84                 .owner = THIS_MODULE,
  85         },
  86 };
  87
  88 static int __init bcm47xxnflash_init(void)
  89 {
  90         int err;
  91
  92         err = platform_driver_register(&bcm47xxnflash_driver);
  93         if (err)
  94                 pr_err("Failed to register bcm47xx nand flash driver: %d\n",
  95                        err);
  96
  97         return err;
  98 }
  99
 100 static void __exit bcm47xxnflash_exit(void)
 101 {
 102         platform_driver_unregister(&bcm47xxnflash_driver);
 103 }
 104
 105 module_init(bcm47xxnflash_init);
 106 module_exit(bcm47xxnflash_exit);