kernel/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/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
  24 #include <asm/mach/flash.h>
  25
  26 #define CACHELINESIZE   32
  27
  28 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
  29                                       ssize_t len)
  30 {
  31         unsigned long start = (unsigned long)map->cached + from;
  32         unsigned long end = start + len;
  33
  34         start &= ~(CACHELINESIZE - 1);
  35         while (start < end) {
  36                 /* invalidate D cache line */
  37                 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
  38                 start += CACHELINESIZE;
  39         }
  40 }
  41
  42 struct pxa2xx_flash_info {
  43         struct mtd_info         *mtd;
  44         struct map_info         map;
  45 };
  46
  47 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
  48
  49 static int pxa2xx_flash_probe(struct platform_device *pdev)
  50 {
  51         struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
  52         struct pxa2xx_flash_info *info;
  53         struct resource *res;
  54
  55         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  56         if (!res)
  57                 return -ENODEV;
  58
  59         info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
  60         if (!info)
  61                 return -ENOMEM;
  62
  63         info->map.name = flash->name;
  64         info->map.bankwidth = flash->width;
  65         info->map.phys = res->start;
  66         info->map.size = resource_size(res);
  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_cache(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         mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
  99                                   flash->nr_parts);
 100
 101         platform_set_drvdata(pdev, info);
 102         return 0;
 103 }
 104
 105 static int pxa2xx_flash_remove(struct platform_device *dev)
 106 {
 107         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 108
 109         mtd_device_unregister(info->mtd);
 110
 111         map_destroy(info->mtd);
 112         iounmap(info->map.virt);
 113         if (info->map.cached)
 114                 iounmap(info->map.cached);
 115         kfree(info);
 116         return 0;
 117 }
 118
 119 #ifdef CONFIG_PM
 120 static void pxa2xx_flash_shutdown(struct platform_device *dev)
 121 {
 122         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 123
 124         if (info && mtd_suspend(info->mtd) == 0)
 125                 mtd_resume(info->mtd);
 126 }
 127 #else
 128 #define pxa2xx_flash_shutdown NULL
 129 #endif
 130
 131 static struct platform_driver pxa2xx_flash_driver = {
 132         .driver = {
 133                 .name           = "pxa2xx-flash",
 134         },
 135         .probe          = pxa2xx_flash_probe,
 136         .remove         = pxa2xx_flash_remove,
 137         .shutdown       = pxa2xx_flash_shutdown,
 138 };
 139
 140 module_platform_driver(pxa2xx_flash_driver);
 141
 142 MODULE_LICENSE("GPL");
 143 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
 144 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");