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

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