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 <asm/mach/flash.h>
  20
  21 #define CACHELINESIZE   32
  22
  23 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
  24                                       ssize_t len)
  25 {
  26         unsigned long start = (unsigned long)map->cached + from;
  27         unsigned long end = start + len;
  28
  29         start &= ~(CACHELINESIZE - 1);
  30         while (start < end) {
  31                 /* invalidate D cache line */
  32                 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
  33                 start += CACHELINESIZE;
  34         }
  35 }
  36
  37 struct pxa2xx_flash_info {
  38         struct mtd_info         *mtd;
  39         struct map_info         map;
  40 };
  41
  42 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
  43
  44 static int pxa2xx_flash_probe(struct platform_device *pdev)
  45 {
  46         struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
  47         struct pxa2xx_flash_info *info;
  48         struct resource *res;
  49
  50         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  51         if (!res)
  52                 return -ENODEV;
  53
  54         info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
  55         if (!info)
  56                 return -ENOMEM;
  57
  58         info->map.name = flash->name;
  59         info->map.bankwidth = flash->width;
  60         info->map.phys = res->start;
  61         info->map.size = resource_size(res);
  62
  63         info->map.virt = ioremap(info->map.phys, info->map.size);
  64         if (!info->map.virt) {
  65                 printk(KERN_WARNING "Failed to ioremap %s\n",
  66                        info->map.name);
  67                 kfree(info);
  68                 return -ENOMEM;
  69         }
  70         info->map.cached = ioremap_cache(info->map.phys, info->map.size);
  71         if (!info->map.cached)
  72                 printk(KERN_WARNING "Failed to ioremap cached %s\n",
  73                        info->map.name);
  74         info->map.inval_cache = pxa2xx_map_inval_cache;
  75         simple_map_init(&info->map);
  76
  77         printk(KERN_NOTICE
  78                "Probing %s at physical address 0x%08lx"
  79                " (%d-bit bankwidth)\n",
  80                info->map.name, (unsigned long)info->map.phys,
  81                info->map.bankwidth * 8);
  82
  83         info->mtd = do_map_probe(flash->map_name, &info->map);
  84
  85         if (!info->mtd) {
  86                 iounmap((void *)info->map.virt);
  87                 if (info->map.cached)
  88                         iounmap(info->map.cached);
  89                 kfree(info);
  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 void 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 }
 113
 114 #ifdef CONFIG_PM
 115 static void pxa2xx_flash_shutdown(struct platform_device *dev)
 116 {
 117         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 118
 119         if (info && mtd_suspend(info->mtd) == 0)
 120                 mtd_resume(info->mtd);
 121 }
 122 #else
 123 #define pxa2xx_flash_shutdown NULL
 124 #endif
 125
 126 static struct platform_driver pxa2xx_flash_driver = {
 127         .driver = {
 128                 .name           = "pxa2xx-flash",
 129         },
 130         .probe          = pxa2xx_flash_probe,
 131         .remove         = pxa2xx_flash_remove,
 132         .shutdown       = pxa2xx_flash_shutdown,
 133 };
 134
 135 module_platform_driver(pxa2xx_flash_driver);
 136
 137 MODULE_LICENSE("GPL");
 138 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
 139 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");