drivers/mtd/maps/rbtx4939-flash.c

   1 /*
   2  * rbtx4939-flash (based on physmap.c)
   3  *
   4  * This is a simplified physmap driver with map_init callback function.
   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  * Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/slab.h>
  18 #include <linux/device.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/mtd/mtd.h>
  21 #include <linux/mtd/map.h>
  22 #include <linux/mtd/partitions.h>
  23 #include <asm/txx9/rbtx4939.h>
  24
  25 struct rbtx4939_flash_info {
  26         struct mtd_info *mtd;
  27         struct map_info map;
  28 };
  29
  30 static int rbtx4939_flash_remove(struct platform_device *dev)
  31 {
  32         struct rbtx4939_flash_info *info;
  33
  34         info = platform_get_drvdata(dev);
  35         if (!info)
  36                 return 0;
  37         platform_set_drvdata(dev, NULL);
  38
  39         if (info->mtd) {
  40                 struct rbtx4939_flash_data *pdata = dev->dev.platform_data;
  41
  42                 mtd_device_unregister(info->mtd);
  43                 map_destroy(info->mtd);
  44         }
  45         return 0;
  46 }
  47
  48 static const char * const rom_probe_types[] = {
  49         "cfi_probe", "jedec_probe", NULL };
  50
  51 static int rbtx4939_flash_probe(struct platform_device *dev)
  52 {
  53         struct rbtx4939_flash_data *pdata;
  54         struct rbtx4939_flash_info *info;
  55         struct resource *res;
  56         const char * const *probe_type;
  57         int err = 0;
  58         unsigned long size;
  59
  60         pdata = dev->dev.platform_data;
  61         if (!pdata)
  62                 return -ENODEV;
  63
  64         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
  65         if (!res)
  66                 return -ENODEV;
  67         info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
  68                             GFP_KERNEL);
  69         if (!info)
  70                 return -ENOMEM;
  71
  72         platform_set_drvdata(dev, info);
  73
  74         size = resource_size(res);
  75         pr_notice("rbtx4939 platform flash device: %pR\n", res);
  76
  77         if (!devm_request_mem_region(&dev->dev, res->start, size,
  78                                      dev_name(&dev->dev)))
  79                 return -EBUSY;
  80
  81         info->map.name = dev_name(&dev->dev);
  82         info->map.phys = res->start;
  83         info->map.size = size;
  84         info->map.bankwidth = pdata->width;
  85
  86         info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
  87         if (!info->map.virt)
  88                 return -EBUSY;
  89
  90         if (pdata->map_init)
  91                 (*pdata->map_init)(&info->map);
  92         else
  93                 simple_map_init(&info->map);
  94
  95         probe_type = rom_probe_types;
  96         for (; !info->mtd && *probe_type; probe_type++)
  97                 info->mtd = do_map_probe(*probe_type, &info->map);
  98         if (!info->mtd) {
  99                 dev_err(&dev->dev, "map_probe failed\n");
 100                 err = -ENXIO;
 101                 goto err_out;
 102         }
 103         info->mtd->owner = THIS_MODULE;
 104         err = mtd_device_parse_register(info->mtd, NULL, NULL, pdata->parts,
 105                                         pdata->nr_parts);
 106
 107         if (err)
 108                 goto err_out;
 109         return 0;
 110
 111 err_out:
 112         rbtx4939_flash_remove(dev);
 113         return err;
 114 }
 115
 116 #ifdef CONFIG_PM
 117 static void rbtx4939_flash_shutdown(struct platform_device *dev)
 118 {
 119         struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
 120
 121         if (mtd_suspend(info->mtd) == 0)
 122                 mtd_resume(info->mtd);
 123 }
 124 #else
 125 #define rbtx4939_flash_shutdown NULL
 126 #endif
 127
 128 static struct platform_driver rbtx4939_flash_driver = {
 129         .probe          = rbtx4939_flash_probe,
 130         .remove         = rbtx4939_flash_remove,
 131         .shutdown       = rbtx4939_flash_shutdown,
 132         .driver         = {
 133                 .name   = "rbtx4939-flash",
 134                 .owner  = THIS_MODULE,
 135         },
 136 };
 137
 138 module_platform_driver(rbtx4939_flash_driver);
 139
 140 MODULE_LICENSE("GPL");
 141 MODULE_DESCRIPTION("RBTX4939 MTD map driver");
 142 MODULE_ALIAS("platform:rbtx4939-flash");