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