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 #ifdef CONFIG_MTD_PARTITIONS
  29         int nr_parts;
  30         struct mtd_partition *parts;
  31 #endif
  32 };
  33
  34 static int rbtx4939_flash_remove(struct platform_device *dev)
  35 {
  36         struct rbtx4939_flash_info *info;
  37
  38         info = platform_get_drvdata(dev);
  39         if (!info)
  40                 return 0;
  41         platform_set_drvdata(dev, NULL);
  42
  43         if (info->mtd) {
  44 #ifdef CONFIG_MTD_PARTITIONS
  45                 struct rbtx4939_flash_data *pdata = dev->dev.platform_data;
  46
  47                 if (info->nr_parts) {
  48                         del_mtd_partitions(info->mtd);
  49                         kfree(info->parts);
  50                 } else if (pdata->nr_parts)
  51                         del_mtd_partitions(info->mtd);
  52                 else
  53                         del_mtd_device(info->mtd);
  54 #else
  55                 del_mtd_device(info->mtd);
  56 #endif
  57                 map_destroy(info->mtd);
  58         }
  59         return 0;
  60 }
  61
  62 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
  63 #ifdef CONFIG_MTD_PARTITIONS
  64 static const char *part_probe_types[] = { "cmdlinepart", NULL };
  65 #endif
  66
  67 static int rbtx4939_flash_probe(struct platform_device *dev)
  68 {
  69         struct rbtx4939_flash_data *pdata;
  70         struct rbtx4939_flash_info *info;
  71         struct resource *res;
  72         const char **probe_type;
  73         int err = 0;
  74         unsigned long size;
  75
  76         pdata = dev->dev.platform_data;
  77         if (!pdata)
  78                 return -ENODEV;
  79
  80         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
  81         if (!res)
  82                 return -ENODEV;
  83         info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
  84                             GFP_KERNEL);
  85         if (!info)
  86                 return -ENOMEM;
  87
  88         platform_set_drvdata(dev, info);
  89
  90         size = resource_size(res);
  91         pr_notice("rbtx4939 platform flash device: %pR\n", res);
  92
  93         if (!devm_request_mem_region(&dev->dev, res->start, size,
  94                                      dev_name(&dev->dev)))
  95                 return -EBUSY;
  96
  97         info->map.name = dev_name(&dev->dev);
  98         info->map.phys = res->start;
  99         info->map.size = size;
 100         info->map.bankwidth = pdata->width;
 101
 102         info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
 103         if (!info->map.virt)
 104                 return -EBUSY;
 105
 106         if (pdata->map_init)
 107                 (*pdata->map_init)(&info->map);
 108         else
 109                 simple_map_init(&info->map);
 110
 111         probe_type = rom_probe_types;
 112         for (; !info->mtd && *probe_type; probe_type++)
 113                 info->mtd = do_map_probe(*probe_type, &info->map);
 114         if (!info->mtd) {
 115                 dev_err(&dev->dev, "map_probe failed\n");
 116                 err = -ENXIO;
 117                 goto err_out;
 118         }
 119         info->mtd->owner = THIS_MODULE;
 120         if (err)
 121                 goto err_out;
 122
 123 #ifdef CONFIG_MTD_PARTITIONS
 124         err = parse_mtd_partitions(info->mtd, part_probe_types,
 125                                 &info->parts, 0);
 126         if (err > 0) {
 127                 add_mtd_partitions(info->mtd, info->parts, err);
 128                 info->nr_parts = err;
 129                 return 0;
 130         }
 131
 132         if (pdata->nr_parts) {
 133                 pr_notice("Using rbtx4939 partition information\n");
 134                 add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
 135                 return 0;
 136         }
 137 #endif
 138
 139         add_mtd_device(info->mtd);
 140         return 0;
 141
 142 err_out:
 143         rbtx4939_flash_remove(dev);
 144         return err;
 145 }
 146
 147 #ifdef CONFIG_PM
 148 static void rbtx4939_flash_shutdown(struct platform_device *dev)
 149 {
 150         struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
 151
 152         if (info->mtd->suspend && info->mtd->resume)
 153                 if (info->mtd->suspend(info->mtd) == 0)
 154                         info->mtd->resume(info->mtd);
 155 }
 156 #else
 157 #define rbtx4939_flash_shutdown NULL
 158 #endif
 159
 160 static struct platform_driver rbtx4939_flash_driver = {
 161         .probe          = rbtx4939_flash_probe,
 162         .remove         = rbtx4939_flash_remove,
 163         .shutdown       = rbtx4939_flash_shutdown,
 164         .driver         = {
 165                 .name   = "rbtx4939-flash",
 166                 .owner  = THIS_MODULE,
 167         },
 168 };
 169
 170 static int __init rbtx4939_flash_init(void)
 171 {
 172         return platform_driver_register(&rbtx4939_flash_driver);
 173 }
 174
 175 static void __exit rbtx4939_flash_exit(void)
 176 {
 177         platform_driver_unregister(&rbtx4939_flash_driver);
 178 }
 179
 180 module_init(rbtx4939_flash_init);
 181 module_exit(rbtx4939_flash_exit);
 182
 183 MODULE_LICENSE("GPL");
 184 MODULE_DESCRIPTION("RBTX4939 MTD map driver");
 185 MODULE_ALIAS("platform:rbtx4939-flash");