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 <asm/prom.h>
  19#include <asm/uaccess.h>
  20#include <asm/io.h>
  21
  22#include <linux/mtd/mtd.h>
  23#include <linux/mtd/map.h>
  24
  25#define UFLASH_OBPNAME  "flashprom"
  26#define DRIVER_NAME     "sun_uflash"
  27#define PFX             DRIVER_NAME ": "
  28
  29#define UFLASH_WINDOW_SIZE      0x200000
  30#define UFLASH_BUSWIDTH         1                       /* EBus is 8-bit */
  31
  32MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
  33MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
  34MODULE_SUPPORTED_DEVICE(DRIVER_NAME);
  35MODULE_LICENSE("GPL");
  36MODULE_VERSION("2.1");
  37
  38struct uflash_dev {
  39        const char              *name;  /* device name */
  40        struct map_info         map;    /* mtd map info */
  41        struct mtd_info         *mtd;   /* mtd info */
  42};
  43
  44struct map_info uflash_map_templ = {
  45        .name =         "SUNW,???-????",
  46        .size =         UFLASH_WINDOW_SIZE,
  47        .bankwidth =    UFLASH_BUSWIDTH,
  48};
  49
  50int uflash_devinit(struct of_device *op, struct device_node *dp)
  51{
  52        struct uflash_dev *up;
  53
  54        if (op->resource[1].flags) {
  55                /* Non-CFI userflash device-- once I find one we
  56                 * can work on supporting it.
  57                 */
  58                printk(KERN_ERR PFX "Unsupported device at %s, 0x%llx\n",
  59                       dp->full_name, (unsigned long long)op->resource[0].start);
  60
  61                return -ENODEV;
  62        }
  63
  64        up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
  65        if (!up) {
  66                printk(KERN_ERR PFX "Cannot allocate struct uflash_dev\n");
  67                return -ENOMEM;
  68        }
  69
  70        /* copy defaults and tweak parameters */
  71        memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));
  72
  73        up->map.size = resource_size(&op->resource[0]);
  74
  75        up->name = of_get_property(dp, "model", NULL);
  76        if (up->name && 0 < strlen(up->name))
  77                up->map.name = (char *)up->name;
  78
  79        up->map.phys = op->resource[0].start;
  80
  81        up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,
  82                                  DRIVER_NAME);
  83        if (!up->map.virt) {
  84                printk(KERN_ERR PFX "Failed to map device.\n");
  85                kfree(up);
  86
  87                return -EINVAL;
  88        }
  89
  90        simple_map_init(&up->map);
  91
  92        /* MTD registration */
  93        up->mtd = do_map_probe("cfi_probe", &up->map);
  94        if (!up->mtd) {
  95                of_iounmap(&op->resource[0], up->map.virt, up->map.size);
  96                kfree(up);
  97
  98                return -ENXIO;
  99        }
 100
 101        up->mtd->owner = THIS_MODULE;
 102
 103        add_mtd_device(up->mtd);
 104
 105        dev_set_drvdata(&op->dev, up);
 106
 107        return 0;
 108}
 109
 110static int __devinit uflash_probe(struct of_device *op, const struct of_device_id *match)
 111{
 112        struct device_node *dp = op->node;
 113
 114        /* Flashprom must have the "user" property in order to
 115         * be used by this driver.
 116         */
 117        if (!of_find_property(dp, "user", NULL))
 118                return -ENODEV;
 119
 120        return uflash_devinit(op, dp);
 121}
 122
 123static int __devexit uflash_remove(struct of_device *op)
 124{
 125        struct uflash_dev *up = dev_get_drvdata(&op->dev);
 126
 127        if (up->mtd) {
 128                del_mtd_device(up->mtd);
 129                map_destroy(up->mtd);
 130        }
 131        if (up->map.virt) {
 132                of_iounmap(&op->resource[0], up->map.virt, up->map.size);
 133                up->map.virt = NULL;
 134        }
 135
 136        kfree(up);
 137
 138        return 0;
 139}
 140
 141static const struct of_device_id uflash_match[] = {
 142        {
 143                .name = UFLASH_OBPNAME,
 144        },
 145        {},
 146};
 147
 148MODULE_DEVICE_TABLE(of, uflash_match);
 149
 150static struct of_platform_driver uflash_driver = {
 151        .name           = DRIVER_NAME,
 152        .match_table    = uflash_match,
 153        .probe          = uflash_probe,
 154        .remove         = __devexit_p(uflash_remove),
 155};
 156
 157static int __init uflash_init(void)
 158{
 159        return of_register_driver(&uflash_driver, &of_bus_type);
 160}
 161
 162static void __exit uflash_exit(void)
 163{
 164        of_unregister_driver(&uflash_driver);
 165}
 166
 167module_init(uflash_init);
 168module_exit(uflash_exit);
 169