LXR linux/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
  28static 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
  42struct pxa2xx_flash_info {
  43        struct mtd_info         *mtd;
  44        struct map_info         map;
  45};
  46
  47static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
  48
  49static 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 = memremap(info->map.phys, info->map.size,
  75                        MEMREMAP_WB);
  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->dev.parent = &pdev->dev;
  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
 105static 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                memunmap(info->map.cached);
 115        kfree(info);
 116        return 0;
 117}
 118
 119#ifdef CONFIG_PM
 120static 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
 131static 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
 140module_platform_driver(pxa2xx_flash_driver);
 141
 142MODULE_LICENSE("GPL");
 143MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
 144MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
 145