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