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_info         *mtd;
  45         struct map_info         map;
  46 };
  47
  48
  49 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  50
  51
  52 static int pxa2xx_flash_probe(struct platform_device *pdev)
  53 {
  54         struct flash_platform_data *flash = pdev->dev.platform_data;
  55         struct pxa2xx_flash_info *info;
  56         struct resource *res;
  57
  58         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  59         if (!res)
  60                 return -ENODEV;
  61
  62         info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
  63         if (!info)
  64                 return -ENOMEM;
  65
  66         info->map.name = (char *) flash->name;
  67         info->map.bankwidth = flash->width;
  68         info->map.phys = res->start;
  69         info->map.size = resource_size(res);
  70
  71         info->map.virt = ioremap(info->map.phys, info->map.size);
  72         if (!info->map.virt) {
  73                 printk(KERN_WARNING "Failed to ioremap %s\n",
  74                        info->map.name);
  75                 return -ENOMEM;
  76         }
  77         info->map.cached =
  78                 ioremap_cached(info->map.phys, info->map.size);
  79         if (!info->map.cached)
  80                 printk(KERN_WARNING "Failed to ioremap cached %s\n",
  81                        info->map.name);
  82         info->map.inval_cache = pxa2xx_map_inval_cache;
  83         simple_map_init(&info->map);
  84
  85         printk(KERN_NOTICE
  86                "Probing %s at physical address 0x%08lx"
  87                " (%d-bit bankwidth)\n",
  88                info->map.name, (unsigned long)info->map.phys,
  89                info->map.bankwidth * 8);
  90
  91         info->mtd = do_map_probe(flash->map_name, &info->map);
  92
  93         if (!info->mtd) {
  94                 iounmap((void *)info->map.virt);
  95                 if (info->map.cached)
  96                         iounmap(info->map.cached);
  97                 return -EIO;
  98         }
  99         info->mtd->owner = THIS_MODULE;
 100
 101         mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
 102                                   flash->nr_parts);
 103
 104         platform_set_drvdata(pdev, info);
 105         return 0;
 106 }
 107
 108 static int pxa2xx_flash_remove(struct platform_device *dev)
 109 {
 110         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 111
 112         platform_set_drvdata(dev, NULL);
 113
 114         mtd_device_unregister(info->mtd);
 115
 116         map_destroy(info->mtd);
 117         iounmap(info->map.virt);
 118         if (info->map.cached)
 119                 iounmap(info->map.cached);
 120         kfree(info);
 121         return 0;
 122 }
 123
 124 #ifdef CONFIG_PM
 125 static void pxa2xx_flash_shutdown(struct platform_device *dev)
 126 {
 127         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 128
 129         if (info && mtd_suspend(info->mtd) == 0)
 130                 mtd_resume(info->mtd);
 131 }
 132 #else
 133 #define pxa2xx_flash_shutdown NULL
 134 #endif
 135
 136 static struct platform_driver pxa2xx_flash_driver = {
 137         .driver = {
 138                 .name           = "pxa2xx-flash",
 139                 .owner          = THIS_MODULE,
 140         },
 141         .probe          = pxa2xx_flash_probe,
 142         .remove         = pxa2xx_flash_remove,
 143         .shutdown       = pxa2xx_flash_shutdown,
 144 };
 145
 146 module_platform_driver(pxa2xx_flash_driver);
 147
 148 MODULE_LICENSE("GPL");
 149 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
 150 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");