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 = kmalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
  67         if (!info)
  68                 return -ENOMEM;
  69
  70         memset(info, 0, sizeof(struct pxa2xx_flash_info));
  71         info->map.name = (char *) flash->name;
  72         info->map.bankwidth = flash->width;
  73         info->map.phys = res->start;
  74         info->map.size = res->end - res->start + 1;
  75         info->parts = flash->parts;
  76         info->nr_parts = flash->nr_parts;
  77
  78         info->map.virt = ioremap(info->map.phys, info->map.size);
  79         if (!info->map.virt) {
  80                 printk(KERN_WARNING "Failed to ioremap %s\n",
  81                        info->map.name);
  82                 return -ENOMEM;
  83         }
  84         info->map.cached =
  85                 ioremap_cached(info->map.phys, info->map.size);
  86         if (!info->map.cached)
  87                 printk(KERN_WARNING "Failed to ioremap cached %s\n",
  88                        info->map.name);
  89         info->map.inval_cache = pxa2xx_map_inval_cache;
  90         simple_map_init(&info->map);
  91
  92         printk(KERN_NOTICE
  93                "Probing %s at physical address 0x%08lx"
  94                " (%d-bit bankwidth)\n",
  95                info->map.name, (unsigned long)info->map.phys,
  96                info->map.bankwidth * 8);
  97
  98         info->mtd = do_map_probe(flash->map_name, &info->map);
  99
 100         if (!info->mtd) {
 101                 iounmap((void *)info->map.virt);
 102                 if (info->map.cached)
 103                         iounmap(info->map.cached);
 104                 return -EIO;
 105         }
 106         info->mtd->owner = THIS_MODULE;
 107
 108 #ifdef CONFIG_MTD_PARTITIONS
 109         ret = parse_mtd_partitions(info->mtd, probes, &parts, 0);
 110
 111         if (ret > 0) {
 112                 info->nr_parts = ret;
 113                 info->parts = parts;
 114         }
 115 #endif
 116
 117         if (info->nr_parts) {
 118                 add_mtd_partitions(info->mtd, info->parts,
 119                                    info->nr_parts);
 120         } else {
 121                 printk("Registering %s as whole device\n",
 122                        info->map.name);
 123                 add_mtd_device(info->mtd);
 124         }
 125
 126         platform_set_drvdata(pdev, info);
 127         return 0;
 128 }
 129
 130 static int __devexit pxa2xx_flash_remove(struct platform_device *dev)
 131 {
 132         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 133
 134         platform_set_drvdata(dev, NULL);
 135
 136 #ifdef CONFIG_MTD_PARTITIONS
 137         if (info->nr_parts)
 138                 del_mtd_partitions(info->mtd);
 139         else
 140 #endif
 141                 del_mtd_device(info->mtd);
 142
 143         map_destroy(info->mtd);
 144         iounmap(info->map.virt);
 145         if (info->map.cached)
 146                 iounmap(info->map.cached);
 147         kfree(info->parts);
 148         kfree(info);
 149         return 0;
 150 }
 151
 152 #ifdef CONFIG_PM
 153 static void pxa2xx_flash_shutdown(struct platform_device *dev)
 154 {
 155         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 156
 157         if (info && info->mtd->suspend(info->mtd) == 0)
 158                 info->mtd->resume(info->mtd);
 159 }
 160 #else
 161 #define pxa2xx_flash_shutdown NULL
 162 #endif
 163
 164 static struct platform_driver pxa2xx_flash_driver = {
 165         .driver = {
 166                 .name           = "pxa2xx-flash",
 167                 .owner          = THIS_MODULE,
 168         },
 169         .probe          = pxa2xx_flash_probe,
 170         .remove         = __devexit_p(pxa2xx_flash_remove),
 171         .shutdown       = pxa2xx_flash_shutdown,
 172 };
 173
 174 static int __init init_pxa2xx_flash(void)
 175 {
 176         return platform_driver_register(&pxa2xx_flash_driver);
 177 }
 178
 179 static void __exit cleanup_pxa2xx_flash(void)
 180 {
 181         platform_driver_unregister(&pxa2xx_flash_driver);
 182 }
 183
 184 module_init(init_pxa2xx_flash);
 185 module_exit(cleanup_pxa2xx_flash);
 186
 187 MODULE_LICENSE("GPL");
 188 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
 189 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");