release/src-rt-6.x.4708/linux/linux-2.6.36/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/slab.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/map.h>
  20 #include <linux/mtd/partitions.h>
  21
  22 #include <asm/io.h>
  23 #include <mach/hardware.h>
  24
  25 #include <asm/mach/flash.h>
  26
  27 #define CACHELINESIZE   32
  28
  29 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
  30                                       ssize_t len)
  31 {
  32         unsigned long start = (unsigned long)map->cached + from;
  33         unsigned long end = start + len;
  34
  35         start &= ~(CACHELINESIZE - 1);
  36         while (start < end) {
  37                 /* invalidate D cache line */
  38                 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
  39                 start += CACHELINESIZE;
  40         }
  41 }
  42
  43 struct pxa2xx_flash_info {
  44         struct mtd_partition    *parts;
  45         int                     nr_parts;
  46         struct mtd_info         *mtd;
  47         struct map_info         map;
  48 };
  49
  50
  51 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  52
  53
  54 static int __init pxa2xx_flash_probe(struct platform_device *pdev)
  55 {
  56         struct flash_platform_data *flash = pdev->dev.platform_data;
  57         struct pxa2xx_flash_info *info;
  58         struct mtd_partition *parts;
  59         struct resource *res;
  60         int ret = 0;
  61
  62         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  63         if (!res)
  64                 return -ENODEV;
  65
  66         info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
  67         if (!info)
  68                 return -ENOMEM;
  69
  70         info->map.name = (char *) flash->name;
  71         info->map.bankwidth = flash->width;
  72         info->map.phys = res->start;
  73         info->map.size = res->end - res->start + 1;
  74         info->parts = flash->parts;
  75         info->nr_parts = flash->nr_parts;
  76
  77         info->map.virt = ioremap(info->map.phys, info->map.size);
  78         if (!info->map.virt) {
  79                 printk(KERN_WARNING "Failed to ioremap %s\n",
  80                        info->map.name);
  81                 return -ENOMEM;
  82         }
  83         info->map.cached =
  84                 ioremap_cached(info->map.phys, info->map.size);
  85         if (!info->map.cached)
  86                 printk(KERN_WARNING "Failed to ioremap cached %s\n",
  87                        info->map.name);
  88         info->map.inval_cache = pxa2xx_map_inval_cache;
  89         simple_map_init(&info->map);
  90
  91         printk(KERN_NOTICE
  92                "Probing %s at physical address 0x%08lx"
  93                " (%d-bit bankwidth)\n",
  94                info->map.name, (unsigned long)info->map.phys,
  95                info->map.bankwidth * 8);
  96
  97         info->mtd = do_map_probe(flash->map_name, &info->map);
  98
  99         if (!info->mtd) {
 100                 iounmap((void *)info->map.virt);
 101                 if (info->map.cached)
 102                         iounmap(info->map.cached);
 103                 return -EIO;
 104         }
 105         info->mtd->owner = THIS_MODULE;
 106
 107 #ifdef CONFIG_MTD_PARTITIONS
 108         ret = parse_mtd_partitions(info->mtd, probes, &parts, 0);
 109
 110         if (ret > 0) {
 111                 info->nr_parts = ret;
 112                 info->parts = parts;
 113         }
 114 #endif
 115
 116         if (info->nr_parts) {
 117                 add_mtd_partitions(info->mtd, info->parts,
 118                                    info->nr_parts);
 119         } else {
 120                 printk("Registering %s as whole device\n",
 121                        info->map.name);
 122                 add_mtd_device(info->mtd);
 123         }
 124
 125         platform_set_drvdata(pdev, info);
 126         return 0;
 127 }
 128
 129 static int __devexit pxa2xx_flash_remove(struct platform_device *dev)
 130 {
 131         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 132
 133         platform_set_drvdata(dev, NULL);
 134
 135 #ifdef CONFIG_MTD_PARTITIONS
 136         if (info->nr_parts)
 137                 del_mtd_partitions(info->mtd);
 138         else
 139 #endif
 140                 del_mtd_device(info->mtd);
 141
 142         map_destroy(info->mtd);
 143         iounmap(info->map.virt);
 144         if (info->map.cached)
 145                 iounmap(info->map.cached);
 146         kfree(info->parts);
 147         kfree(info);
 148         return 0;
 149 }
 150
 151 #ifdef CONFIG_PM
 152 static void pxa2xx_flash_shutdown(struct platform_device *dev)
 153 {
 154         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 155
 156         if (info && info->mtd->suspend(info->mtd) == 0)
 157                 info->mtd->resume(info->mtd);
 158 }
 159 #else
 160 #define pxa2xx_flash_shutdown NULL
 161 #endif
 162
 163 static struct platform_driver pxa2xx_flash_driver = {
 164         .driver = {
 165                 .name           = "pxa2xx-flash",
 166                 .owner          = THIS_MODULE,
 167         },
 168         .probe          = pxa2xx_flash_probe,
 169         .remove         = __devexit_p(pxa2xx_flash_remove),
 170         .shutdown       = pxa2xx_flash_shutdown,
 171 };
 172
 173 static int __init init_pxa2xx_flash(void)
 174 {
 175         return platform_driver_register(&pxa2xx_flash_driver);
 176 }
 177
 178 static void __exit cleanup_pxa2xx_flash(void)
 179 {
 180         platform_driver_unregister(&pxa2xx_flash_driver);
 181 }
 182
 183 module_init(init_pxa2xx_flash);
 184 module_exit(cleanup_pxa2xx_flash);
 185
 186 MODULE_LICENSE("GPL");
 187 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
 188 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");