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 <asm/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 device *dev)
  45 {
  46         struct platform_device *pdev = to_platform_device(dev);
  47         struct flash_platform_data *flash = pdev->dev.platform_data;
  48         struct pxa2xx_flash_info *info;
  49         struct mtd_partition *parts;
  50         struct resource *res;
  51         int ret = 0;
  52
  53         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  54         if (!res)
  55                 return -ENODEV;
  56
  57         info = kmalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
  58         if (!info)
  59                 return -ENOMEM;
  60
  61         memset(info, 0, sizeof(struct pxa2xx_flash_info));
  62         info->map.name = (char *) flash->name;
  63         info->map.bankwidth = flash->width;
  64         info->map.phys = res->start;
  65         info->map.size = res->end - res->start + 1;
  66         info->parts = flash->parts;
  67         info->nr_parts = flash->nr_parts;
  68
  69         info->map.virt = ioremap(info->map.phys, info->map.size);
  70         if (!info->map.virt) {
  71                 printk(KERN_WARNING "Failed to ioremap %s\n",
  72                        info->map.name);
  73                 return -ENOMEM;
  74         }
  75         info->map.cached =
  76                 ioremap_cached(info->map.phys, info->map.size);
  77         if (!info->map.cached)
  78                 printk(KERN_WARNING "Failed to ioremap cached %s\n",
  79                        info->map.name);
  80         info->map.inval_cache = pxa2xx_map_inval_cache;
  81         simple_map_init(&info->map);
  82
  83         printk(KERN_NOTICE
  84                "Probing %s at physical address 0x%08lx"
  85                " (%d-bit bankwidth)\n",
  86                info->map.name, (unsigned long)info->map.phys,
  87                info->map.bankwidth * 8);
  88
  89         info->mtd = do_map_probe(flash->map_name, &info->map);
  90
  91         if (!info->mtd) {
  92                 iounmap((void *)info->map.virt);
  93                 if (info->map.cached)
  94                         iounmap(info->map.cached);
  95                 return -EIO;
  96         }
  97         info->mtd->owner = THIS_MODULE;
  98
  99 #ifdef CONFIG_MTD_PARTITIONS
 100         ret = parse_mtd_partitions(info->mtd, probes, &parts, 0);
 101
 102         if (ret > 0) {
 103                 info->nr_parts = ret;
 104                 info->parts = parts;
 105         }
 106 #endif
 107
 108         if (info->nr_parts) {
 109                 add_mtd_partitions(info->mtd, info->parts,
 110                                    info->nr_parts);
 111         } else {
 112                 printk("Registering %s as whole device\n",
 113                        info->map.name);
 114                 add_mtd_device(info->mtd);
 115         }
 116
 117         dev_set_drvdata(dev, info);
 118         return 0;
 119 }
 120
 121 static int __exit pxa2xx_flash_remove(struct device *dev)
 122 {
 123         struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
 124
 125         dev_set_drvdata(dev, NULL);
 126
 127 #ifdef CONFIG_MTD_PARTITIONS
 128         if (info->nr_parts)
 129                 del_mtd_partitions(info->mtd);
 130         else
 131 #endif
 132                 del_mtd_device(info->mtd);
 133
 134         map_destroy(info->mtd);
 135         iounmap(info->map.virt);
 136         if (info->map.cached)
 137                 iounmap(info->map.cached);
 138         kfree(info->parts);
 139         kfree(info);
 140         return 0;
 141 }
 142
 143 #ifdef CONFIG_PM
 144 static int pxa2xx_flash_suspend(struct device *dev, pm_message_t state)
 145 {
 146         struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
 147         int ret = 0;
 148
 149         if (info->mtd && info->mtd->suspend)
 150                 ret = info->mtd->suspend(info->mtd);
 151         return ret;
 152 }
 153
 154 static int pxa2xx_flash_resume(struct device *dev)
 155 {
 156         struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
 157
 158         if (info->mtd && info->mtd->resume)
 159                 info->mtd->resume(info->mtd);
 160         return 0;
 161 }
 162 static void pxa2xx_flash_shutdown(struct device *dev)
 163 {
 164         struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
 165
 166         if (info && info->mtd->suspend(info->mtd) == 0)
 167                 info->mtd->resume(info->mtd);
 168 }
 169 #else
 170 #define pxa2xx_flash_suspend NULL
 171 #define pxa2xx_flash_resume NULL
 172 #define pxa2xx_flash_shutdown NULL
 173 #endif
 174
 175 static struct device_driver pxa2xx_flash_driver = {
 176         .name           = "pxa2xx-flash",
 177         .bus            = &platform_bus_type,
 178         .probe          = pxa2xx_flash_probe,
 179         .remove         = __exit_p(pxa2xx_flash_remove),
 180         .suspend        = pxa2xx_flash_suspend,
 181         .resume         = pxa2xx_flash_resume,
 182         .shutdown       = pxa2xx_flash_shutdown,
 183 };
 184
 185 static int __init init_pxa2xx_flash(void)
 186 {
 187         return driver_register(&pxa2xx_flash_driver);
 188 }
 189
 190 static void __exit cleanup_pxa2xx_flash(void)
 191 {
 192         driver_unregister(&pxa2xx_flash_driver);
 193 }
 194
 195 module_init(init_pxa2xx_flash);
 196 module_exit(cleanup_pxa2xx_flash);
 197
 198 MODULE_LICENSE("GPL");
 199 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
 200 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");