LXR linux/drivers/mtd/maps/sun

   1/* sun_uflash.c - Driver for user-programmable flash on
   2 *                Sun Microsystems SME boardsets.
   3 *
   4 * This driver does NOT provide access to the OBP-flash for
   5 * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
   6 *
   7 * Copyright (c) 2001 Eric Brower (ebrower@usa.net)
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/module.h>
  12#include <linux/fs.h>
  13#include <linux/errno.h>
  14#include <linux/init.h>
  15#include <linux/ioport.h>
  16#include <linux/of.h>
  17#include <linux/of_device.h>
  18#include <linux/slab.h>
  19#include <asm/prom.h>
  20#include <asm/uaccess.h>
  21#include <asm/io.h>
  22
  23#include <linux/mtd/mtd.h>
  24#include <linux/mtd/map.h>
  25
  26#define UFLASH_OBPNAME  "flashprom"
  27#define DRIVER_NAME     "sun_uflash"
  28#define PFX             DRIVER_NAME ": "
  29
  30#define UFLASH_WINDOW_SIZE      0x200000
  31#define UFLASH_BUSWIDTH         1                       /* EBus is 8-bit */
  32
  33MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
  34MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
  35MODULE_SUPPORTED_DEVICE(DRIVER_NAME);
  36MODULE_LICENSE("GPL");
  37MODULE_VERSION("2.1");
  38
  39struct uflash_dev {
  40        const char              *name;  /* device name */
  41        struct map_info         map;    /* mtd map info */
  42        struct mtd_info         *mtd;   /* mtd info */
  43};
  44
  45struct map_info uflash_map_templ = {
  46        .name =         "SUNW,???-????",
  47        .size =         UFLASH_WINDOW_SIZE,
  48        .bankwidth =    UFLASH_BUSWIDTH,
  49};
  50
  51int uflash_devinit(struct platform_device *op, struct device_node *dp)
  52{
  53        struct uflash_dev *up;
  54
  55        if (op->resource[1].flags) {
  56                /* Non-CFI userflash device-- once I find one we
  57                 * can work on supporting it.
  58                 */
  59                printk(KERN_ERR PFX "Unsupported device at %s, 0x%llx\n",
  60                       dp->full_name, (unsigned long long)op->resource[0].start);
  61
  62                return -ENODEV;
  63        }
  64
  65        up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
  66        if (!up) {
  67                printk(KERN_ERR PFX "Cannot allocate struct uflash_dev\n");
  68                return -ENOMEM;
  69        }
  70
  71        /* copy defaults and tweak parameters */
  72        memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));
  73
  74        up->map.size = resource_size(&op->resource[0]);
  75
  76        up->name = of_get_property(dp, "model", NULL);
  77        if (up->name && 0 < strlen(up->name))
  78                up->map.name = (char *)up->name;
  79
  80        up->map.phys = op->resource[0].start;
  81
  82        up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,
  83                                  DRIVER_NAME);
  84        if (!up->map.virt) {
  85                printk(KERN_ERR PFX "Failed to map device.\n");
  86                kfree(up);
  87
  88                return -EINVAL;
  89        }
  90
  91        simple_map_init(&up->map);
  92
  93        /* MTD registration */
  94        up->mtd = do_map_probe("cfi_probe", &up->map);
  95        if (!up->mtd) {
  96                of_iounmap(&op->resource[0], up->map.virt, up->map.size);
  97                kfree(up);
  98
  99                return -ENXIO;
 100        }
 101
 102        up->mtd->owner = THIS_MODULE;
 103
 104        mtd_device_register(up->mtd, NULL, 0);
 105
 106        dev_set_drvdata(&op->dev, up);
 107
 108        return 0;
 109}
 110
 111static int uflash_probe(struct platform_device *op)
 112{
 113        struct device_node *dp = op->dev.of_node;
 114
 115        /* Flashprom must have the "user" property in order to
 116         * be used by this driver.
 117         */
 118        if (!of_find_property(dp, "user", NULL))
 119                return -ENODEV;
 120
 121        return uflash_devinit(op, dp);
 122}
 123
 124static int uflash_remove(struct platform_device *op)
 125{
 126        struct uflash_dev *up = dev_get_drvdata(&op->dev);
 127
 128        if (up->mtd) {
 129                mtd_device_unregister(up->mtd);
 130                map_destroy(up->mtd);
 131        }
 132        if (up->map.virt) {
 133                of_iounmap(&op->resource[0], up->map.virt, up->map.size);
 134                up->map.virt = NULL;
 135        }
 136
 137        kfree(up);
 138
 139        return 0;
 140}
 141
 142static const struct of_device_id uflash_match[] = {
 143        {
 144                .name = UFLASH_OBPNAME,
 145        },
 146        {},
 147};
 148
 149MODULE_DEVICE_TABLE(of, uflash_match);
 150
 151static struct platform_driver uflash_driver = {
 152        .driver = {
 153                .name = DRIVER_NAME,
 154                .owner = THIS_MODULE,
 155                .of_match_table = uflash_match,
 156        },
 157        .probe          = uflash_probe,
 158        .remove         = uflash_remove,
 159};
 160
 161module_platform_driver(uflash_driver);
 162