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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/slab.h>
 17 #include <linux/device.h>
 18 #include <linux/platform_device.h>
 19 #include <linux/mtd/mtd.h>
 20 #include <linux/mtd/map.h>
 21 #include <linux/mtd/partitions.h>
 22 #include <asm/txx9/rbtx4939.h>
 23 
 24 struct rbtx4939_flash_info {
 25         struct mtd_info *mtd;
 26         struct map_info map;
 27 };
 28 
 29 static int rbtx4939_flash_remove(struct platform_device *dev)
 30 {
 31         struct rbtx4939_flash_info *info;
 32 
 33         info = platform_get_drvdata(dev);
 34         if (!info)
 35                 return 0;
 36 
 37         if (info->mtd) {
 38                 struct rbtx4939_flash_data *pdata = dev_get_platdata(&dev->dev);
 39 
 40                 mtd_device_unregister(info->mtd);
 41                 map_destroy(info->mtd);
 42         }
 43         return 0;
 44 }
 45 
 46 static const char * const rom_probe_types[] = {
 47         "cfi_probe", "jedec_probe", NULL };
 48 
 49 static int rbtx4939_flash_probe(struct platform_device *dev)
 50 {
 51         struct rbtx4939_flash_data *pdata;
 52         struct rbtx4939_flash_info *info;
 53         struct resource *res;
 54         const char * const *probe_type;
 55         int err = 0;
 56         unsigned long size;
 57 
 58         pdata = dev_get_platdata(&dev->dev);
 59         if (!pdata)
 60                 return -ENODEV;
 61 
 62         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 63         if (!res)
 64                 return -ENODEV;
 65         info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
 66                             GFP_KERNEL);
 67         if (!info)
 68                 return -ENOMEM;
 69 
 70         platform_set_drvdata(dev, info);
 71 
 72         size = resource_size(res);
 73         pr_notice("rbtx4939 platform flash device: %pR\n", res);
 74 
 75         if (!devm_request_mem_region(&dev->dev, res->start, size,
 76                                      dev_name(&dev->dev)))
 77                 return -EBUSY;
 78 
 79         info->map.name = dev_name(&dev->dev);
 80         info->map.phys = res->start;
 81         info->map.size = size;
 82         info->map.bankwidth = pdata->width;
 83 
 84         info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
 85         if (!info->map.virt)
 86                 return -EBUSY;
 87 
 88         if (pdata->map_init)
 89                 (*pdata->map_init)(&info->map);
 90         else
 91                 simple_map_init(&info->map);
 92 
 93         probe_type = rom_probe_types;
 94         for (; !info->mtd && *probe_type; probe_type++)
 95                 info->mtd = do_map_probe(*probe_type, &info->map);
 96         if (!info->mtd) {
 97                 dev_err(&dev->dev, "map_probe failed\n");
 98                 err = -ENXIO;
 99                 goto err_out;
100         }
101         info->mtd->owner = THIS_MODULE;
102         err = mtd_device_parse_register(info->mtd, NULL, NULL, pdata->parts,
103                                         pdata->nr_parts);
104 
105         if (err)
106                 goto err_out;
107         return 0;
108 
109 err_out:
110         rbtx4939_flash_remove(dev);
111         return err;
112 }
113 
114 #ifdef CONFIG_PM
115 static void rbtx4939_flash_shutdown(struct platform_device *dev)
116 {
117         struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
118 
119         if (mtd_suspend(info->mtd) == 0)
120                 mtd_resume(info->mtd);
121 }
122 #else
123 #define rbtx4939_flash_shutdown NULL
124 #endif
125 
126 static struct platform_driver rbtx4939_flash_driver = {
127         .probe          = rbtx4939_flash_probe,
128         .remove         = rbtx4939_flash_remove,
129         .shutdown       = rbtx4939_flash_shutdown,
130         .driver         = {
131                 .name   = "rbtx4939-flash",
132                 .owner  = THIS_MODULE,
133         },
134 };
135 
136 module_platform_driver(rbtx4939_flash_driver);
137 
138 MODULE_LICENSE("GPL");
139 MODULE_DESCRIPTION("RBTX4939 MTD map driver");
140 MODULE_ALIAS("platform:rbtx4939-flash");
141 

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