drivers/mtd/maps/pxa2xx-flash.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Map driver for Intel XScale PXA2xx platforms.
   4  *
   5  * Author:      Nicolas Pitre
   6  * Copyright:   (C) 2001 MontaVista Software Inc.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/types.h>
  11 #include <linux/slab.h>
  12 #include <linux/kernel.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/mtd/mtd.h>
  15 #include <linux/mtd/map.h>
  16 #include <linux/mtd/partitions.h>
  17
  18 #include <asm/io.h>
  19 #include <mach/hardware.h>
  20
  21 #include <asm/mach/flash.h>
  22
  23 #define CACHELINESIZE   32
  24
  25 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
  26                                       ssize_t len)
  27 {
  28         unsigned long start = (unsigned long)map->cached + from;
  29         unsigned long end = start + len;
  30
  31         start &= ~(CACHELINESIZE - 1);
  32         while (start < end) {
  33                 /* invalidate D cache line */
  34                 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
  35                 start += CACHELINESIZE;
  36         }
  37 }
  38
  39 struct pxa2xx_flash_info {
  40         struct mtd_info         *mtd;
  41         struct map_info         map;
  42 };
  43
  44 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
  45
  46 static int pxa2xx_flash_probe(struct platform_device *pdev)
  47 {
  48         struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
  49         struct pxa2xx_flash_info *info;
  50         struct resource *res;
  51
  52         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  53         if (!res)
  54                 return -ENODEV;
  55
  56         info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
  57         if (!info)
  58                 return -ENOMEM;
  59
  60         info->map.name = flash->name;
  61         info->map.bankwidth = flash->width;
  62         info->map.phys = res->start;
  63         info->map.size = resource_size(res);
  64
  65         info->map.virt = ioremap(info->map.phys, info->map.size);
  66         if (!info->map.virt) {
  67                 printk(KERN_WARNING "Failed to ioremap %s\n",
  68                        info->map.name);
  69                 return -ENOMEM;
  70         }
  71         info->map.cached = ioremap_cache(info->map.phys, info->map.size);
  72         if (!info->map.cached)
  73                 printk(KERN_WARNING "Failed to ioremap cached %s\n",
  74                        info->map.name);
  75         info->map.inval_cache = pxa2xx_map_inval_cache;
  76         simple_map_init(&info->map);
  77
  78         printk(KERN_NOTICE
  79                "Probing %s at physical address 0x%08lx"
  80                " (%d-bit bankwidth)\n",
  81                info->map.name, (unsigned long)info->map.phys,
  82                info->map.bankwidth * 8);
  83
  84         info->mtd = do_map_probe(flash->map_name, &info->map);
  85
  86         if (!info->mtd) {
  87                 iounmap((void *)info->map.virt);
  88                 if (info->map.cached)
  89                         iounmap(info->map.cached);
  90                 return -EIO;
  91         }
  92         info->mtd->dev.parent = &pdev->dev;
  93
  94         mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
  95                                   flash->nr_parts);
  96
  97         platform_set_drvdata(pdev, info);
  98         return 0;
  99 }
 100
 101 static int pxa2xx_flash_remove(struct platform_device *dev)
 102 {
 103         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 104
 105         mtd_device_unregister(info->mtd);
 106
 107         map_destroy(info->mtd);
 108         iounmap(info->map.virt);
 109         if (info->map.cached)
 110                 iounmap(info->map.cached);
 111         kfree(info);
 112         return 0;
 113 }
 114
 115 #ifdef CONFIG_PM
 116 static void pxa2xx_flash_shutdown(struct platform_device *dev)
 117 {
 118         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 119
 120         if (info && mtd_suspend(info->mtd) == 0)
 121                 mtd_resume(info->mtd);
 122 }
 123 #else
 124 #define pxa2xx_flash_shutdown NULL
 125 #endif
 126
 127 static struct platform_driver pxa2xx_flash_driver = {
 128         .driver = {
 129                 .name           = "pxa2xx-flash",
 130         },
 131         .probe          = pxa2xx_flash_probe,
 132         .remove         = pxa2xx_flash_remove,
 133         .shutdown       = pxa2xx_flash_shutdown,
 134 };
 135
 136 module_platform_driver(pxa2xx_flash_driver);
 137
 138 MODULE_LICENSE("GPL");
 139 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
 140 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");