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
  21 struct rbtx4939_flash_info {
  22         struct mtd_info *mtd;
  23         struct map_info map;
  24 };
  25
  26 static 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
  41 static const char * const rom_probe_types[] = {
  42         "cfi_probe", "jedec_probe", NULL };
  43
  44 static 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
 103 err_out:
 104         rbtx4939_flash_remove(dev);
 105         return err;
 106 }
 107
 108 #ifdef CONFIG_PM
 109 static 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
 120 static 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
 129 module_platform_driver(rbtx4939_flash_driver);
 130
 131 MODULE_LICENSE("GPL");
 132 MODULE_DESCRIPTION("RBTX4939 MTD map driver");
 133 MODULE_ALIAS("platform:rbtx4939-flash");