LXR linux/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
  25struct rbtx4939_flash_info {
  26        struct mtd_info *mtd;
  27        struct map_info map;
  28};
  29
  30static 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
  48static const char * const rom_probe_types[] = {
  49        "cfi_probe", "jedec_probe", NULL };
  50
  51static 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
 111err_out:
 112        rbtx4939_flash_remove(dev);
 113        return err;
 114}
 115
 116#ifdef CONFIG_PM
 117static 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
 128static 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
 138module_platform_driver(rbtx4939_flash_driver);
 139
 140MODULE_LICENSE("GPL");
 141MODULE_DESCRIPTION("RBTX4939 MTD map driver");
 142MODULE_ALIAS("platform:rbtx4939-flash");
 143