drivers/mtd/maps/pxa2xx-flash.c

   1 /*
   2  * Map driver for Intel XScale PXA2xx platforms.
   3  *
   4  * Author:      Nicolas Pitre
   5  * Copyright:   (C) 2001 MontaVista Software Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/mtd/map.h>
  19 #include <linux/mtd/partitions.h>
  20
  21 #include <asm/io.h>
  22 #include <mach/hardware.h>
  23 #include <asm/cacheflush.h>
  24
  25 #include <asm/mach/flash.h>
  26
  27 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
  28                                       ssize_t len)
  29 {
  30         flush_ioremap_region(map->phys, map->cached, from, len);
  31 }
  32
  33 struct pxa2xx_flash_info {
  34         struct mtd_partition    *parts;
  35         int                     nr_parts;
  36         struct mtd_info         *mtd;
  37         struct map_info         map;
  38 };
  39
  40
  41 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  42
  43
  44 static int __init pxa2xx_flash_probe(struct platform_device *pdev)
  45 {
  46         struct flash_platform_data *flash = pdev->dev.platform_data;
  47         struct pxa2xx_flash_info *info;
  48         struct mtd_partition *parts;
  49         struct resource *res;
  50         int ret = 0;
  51
  52         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  53         if (!res)
  54                 return -ENODEV;
  55
  56         info = kmalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
  57         if (!info)
  58                 return -ENOMEM;
  59
  60         memset(info, 0, sizeof(struct pxa2xx_flash_info));
  61         info->map.name = (char *) flash->name;
  62         info->map.bankwidth = flash->width;
  63         info->map.phys = res->start;
  64         info->map.size = res->end - res->start + 1;
  65         info->parts = flash->parts;
  66         info->nr_parts = flash->nr_parts;
  67
  68         info->map.virt = ioremap(info->map.phys, info->map.size);
  69         if (!info->map.virt) {
  70                 printk(KERN_WARNING "Failed to ioremap %s\n",
  71                        info->map.name);
  72                 return -ENOMEM;
  73         }
  74         info->map.cached =
  75                 ioremap_cached(info->map.phys, info->map.size);
  76         if (!info->map.cached)
  77                 printk(KERN_WARNING "Failed to ioremap cached %s\n",
  78                        info->map.name);
  79         info->map.inval_cache = pxa2xx_map_inval_cache;
  80         simple_map_init(&info->map);
  81
  82         printk(KERN_NOTICE
  83                "Probing %s at physical address 0x%08lx"
  84                " (%d-bit bankwidth)\n",
  85                info->map.name, (unsigned long)info->map.phys,
  86                info->map.bankwidth * 8);
  87
  88         info->mtd = do_map_probe(flash->map_name, &info->map);
  89
  90         if (!info->mtd) {
  91                 iounmap((void *)info->map.virt);
  92                 if (info->map.cached)
  93                         iounmap(info->map.cached);
  94                 return -EIO;
  95         }
  96         info->mtd->owner = THIS_MODULE;
  97
  98 #ifdef CONFIG_MTD_PARTITIONS
  99         ret = parse_mtd_partitions(info->mtd, probes, &parts, 0);
 100
 101         if (ret > 0) {
 102                 info->nr_parts = ret;
 103                 info->parts = parts;
 104         }
 105 #endif
 106
 107         if (info->nr_parts) {
 108                 add_mtd_partitions(info->mtd, info->parts,
 109                                    info->nr_parts);
 110         } else {
 111                 printk("Registering %s as whole device\n",
 112                        info->map.name);
 113                 add_mtd_device(info->mtd);
 114         }
 115
 116         platform_set_drvdata(pdev, info);
 117         return 0;
 118 }
 119
 120 static int __devexit pxa2xx_flash_remove(struct platform_device *dev)
 121 {
 122         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 123
 124         platform_set_drvdata(dev, NULL);
 125
 126 #ifdef CONFIG_MTD_PARTITIONS
 127         if (info->nr_parts)
 128                 del_mtd_partitions(info->mtd);
 129         else
 130 #endif
 131                 del_mtd_device(info->mtd);
 132
 133         map_destroy(info->mtd);
 134         iounmap(info->map.virt);
 135         if (info->map.cached)
 136                 iounmap(info->map.cached);
 137         kfree(info->parts);
 138         kfree(info);
 139         return 0;
 140 }
 141
 142 #ifdef CONFIG_PM
 143 static int pxa2xx_flash_suspend(struct platform_device *dev, pm_message_t state)
 144 {
 145         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 146         int ret = 0;
 147
 148         if (info->mtd && info->mtd->suspend)
 149                 ret = info->mtd->suspend(info->mtd);
 150         return ret;
 151 }
 152
 153 static int pxa2xx_flash_resume(struct platform_device *dev)
 154 {
 155         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 156
 157         if (info->mtd && info->mtd->resume)
 158                 info->mtd->resume(info->mtd);
 159         return 0;
 160 }
 161 static void pxa2xx_flash_shutdown(struct platform_device *dev)
 162 {
 163         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 164
 165         if (info && info->mtd->suspend(info->mtd) == 0)
 166                 info->mtd->resume(info->mtd);
 167 }
 168 #else
 169 #define pxa2xx_flash_suspend NULL
 170 #define pxa2xx_flash_resume NULL
 171 #define pxa2xx_flash_shutdown NULL
 172 #endif
 173
 174 static struct platform_driver pxa2xx_flash_driver = {
 175         .driver = {
 176                 .name           = "pxa2xx-flash",
 177                 .owner          = THIS_MODULE,
 178         },
 179         .probe          = pxa2xx_flash_probe,
 180         .remove         = __devexit_p(pxa2xx_flash_remove),
 181         .suspend        = pxa2xx_flash_suspend,
 182         .resume         = pxa2xx_flash_resume,
 183         .shutdown       = pxa2xx_flash_shutdown,
 184 };
 185
 186 static int __init init_pxa2xx_flash(void)
 187 {
 188         return platform_driver_register(&pxa2xx_flash_driver);
 189 }
 190
 191 static void __exit cleanup_pxa2xx_flash(void)
 192 {
 193         platform_driver_unregister(&pxa2xx_flash_driver);
 194 }
 195
 196 module_init(init_pxa2xx_flash);
 197 module_exit(cleanup_pxa2xx_flash);
 198
 199 MODULE_LICENSE("GPL");
 200 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
 201 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");