LXR linux/drivers/mtd/maps/rbtx4939-flash.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * rbtx4939-flash (based on physmap.c)
   4 *
   5 * This is a simplified physmap driver with map_init callback function.
   6 *
   7 * Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/types.h>
  12#include <linux/kernel.h>
  13#include <linux/slab.h>
  14#include <linux/device.h>
  15#include <linux/platform_device.h>
  16#include <linux/mtd/mtd.h>
  17#include <linux/mtd/map.h>
  18#include <linux/mtd/partitions.h>
  19#include <asm/txx9/rbtx4939.h>
  20
  21struct rbtx4939_flash_info {
  22        struct mtd_info *mtd;
  23        struct map_info map;
  24};
  25
  26static int rbtx4939_flash_remove(struct platform_device *dev)
  27{
  28        struct rbtx4939_flash_info *info;
  29
  30        info = platform_get_drvdata(dev);
  31        if (!info)
  32                return 0;
  33
  34        if (info->mtd) {
  35                mtd_device_unregister(info->mtd);
  36                map_destroy(info->mtd);
  37        }
  38        return 0;
  39}
  40
  41static const char * const rom_probe_types[] = {
  42        "cfi_probe", "jedec_probe", NULL };
  43
  44static int rbtx4939_flash_probe(struct platform_device *dev)
  45{
  46        struct rbtx4939_flash_data *pdata;
  47        struct rbtx4939_flash_info *info;
  48        struct resource *res;
  49        const char * const *probe_type;
  50        int err = 0;
  51        unsigned long size;
  52
  53        pdata = dev_get_platdata(&dev->dev);
  54        if (!pdata)
  55                return -ENODEV;
  56
  57        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
  58        if (!res)
  59                return -ENODEV;
  60        info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
  61                            GFP_KERNEL);
  62        if (!info)
  63                return -ENOMEM;
  64
  65        platform_set_drvdata(dev, info);
  66
  67        size = resource_size(res);
  68        pr_notice("rbtx4939 platform flash device: %pR\n", res);
  69
  70        if (!devm_request_mem_region(&dev->dev, res->start, size,
  71                                     dev_name(&dev->dev)))
  72                return -EBUSY;
  73
  74        info->map.name = dev_name(&dev->dev);
  75        info->map.phys = res->start;
  76        info->map.size = size;
  77        info->map.bankwidth = pdata->width;
  78
  79        info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
  80        if (!info->map.virt)
  81                return -EBUSY;
  82
  83        if (pdata->map_init)
  84                (*pdata->map_init)(&info->map);
  85        else
  86                simple_map_init(&info->map);
  87
  88        probe_type = rom_probe_types;
  89        for (; !info->mtd && *probe_type; probe_type++)
  90                info->mtd = do_map_probe(*probe_type, &info->map);
  91        if (!info->mtd) {
  92                dev_err(&dev->dev, "map_probe failed\n");
  93                err = -ENXIO;
  94                goto err_out;
  95        }
  96        info->mtd->dev.parent = &dev->dev;
  97        err = mtd_device_register(info->mtd, pdata->parts, pdata->nr_parts);
  98
  99        if (err)
 100                goto err_out;
 101        return 0;
 102
 103err_out:
 104        rbtx4939_flash_remove(dev);
 105        return err;
 106}
 107
 108#ifdef CONFIG_PM
 109static void rbtx4939_flash_shutdown(struct platform_device *dev)
 110{
 111        struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
 112
 113        if (mtd_suspend(info->mtd) == 0)
 114                mtd_resume(info->mtd);
 115}
 116#else
 117#define rbtx4939_flash_shutdown NULL
 118#endif
 119
 120static struct platform_driver rbtx4939_flash_driver = {
 121        .probe          = rbtx4939_flash_probe,
 122        .remove         = rbtx4939_flash_remove,
 123        .shutdown       = rbtx4939_flash_shutdown,
 124        .driver         = {
 125                .name   = "rbtx4939-flash",
 126        },
 127};
 128
 129module_platform_driver(rbtx4939_flash_driver);
 130
 131MODULE_LICENSE("GPL");
 132MODULE_DESCRIPTION("RBTX4939 MTD map driver");
 133MODULE_ALIAS("platform:rbtx4939-flash");
 134