drivers/mtd/maps/sun_uflash.c

   1 /*
   2  *
   3  * sun_uflash - Driver implementation for user-programmable flash
   4  * present on many Sun Microsystems SME boardsets.
   5  *
   6  * This driver does NOT provide access to the OBP-flash for
   7  * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
   8  *
   9  * Copyright (c) 2001 Eric Brower (ebrower@usa.net)
  10  *
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/fs.h>
  16 #include <linux/errno.h>
  17 #include <linux/init.h>
  18 #include <linux/ioport.h>
  19 #include <asm/ebus.h>
  20 #include <asm/oplib.h>
  21 #include <asm/prom.h>
  22 #include <asm/uaccess.h>
  23 #include <asm/io.h>
  24
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/mtd/map.h>
  27
  28 #define UFLASH_OBPNAME  "flashprom"
  29 #define UFLASH_DEVNAME  "userflash"
  30
  31 #define UFLASH_WINDOW_SIZE      0x200000
  32 #define UFLASH_BUSWIDTH         1                       /* EBus is 8-bit */
  33
  34 MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
  35 MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
  36 MODULE_SUPPORTED_DEVICE("userflash");
  37 MODULE_LICENSE("GPL");
  38 MODULE_VERSION("2.0");
  39
  40 static LIST_HEAD(device_list);
  41 struct uflash_dev {
  42         const char              *name;  /* device name */
  43         struct map_info         map;    /* mtd map info */
  44         struct mtd_info         *mtd;   /* mtd info */
  45 };
  46
  47
  48 struct map_info uflash_map_templ = {
  49         .name =         "SUNW,???-????",
  50         .size =         UFLASH_WINDOW_SIZE,
  51         .bankwidth =    UFLASH_BUSWIDTH,
  52 };
  53
  54 int uflash_devinit(struct linux_ebus_device *edev, struct device_node *dp)
  55 {
  56         struct uflash_dev *up;
  57         struct resource *res;
  58
  59         res = &edev->resource[0];
  60
  61         if (edev->num_addrs != 1) {
  62                 /* Non-CFI userflash device-- once I find one we
  63                  * can work on supporting it.
  64                  */
  65                 printk("%s: unsupported device at 0x%llx (%d regs): " \
  66                         "email ebrower@usa.net\n",
  67                        dp->full_name, (unsigned long long)res->start,
  68                        edev->num_addrs);
  69
  70                 return -ENODEV;
  71         }
  72
  73         up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
  74         if (!up)
  75                 return -ENOMEM;
  76
  77         /* copy defaults and tweak parameters */
  78         memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));
  79         up->map.size = (res->end - res->start) + 1UL;
  80
  81         up->name = of_get_property(dp, "model", NULL);
  82         if (up->name && 0 < strlen(up->name))
  83                 up->map.name = (char *)up->name;
  84
  85         up->map.phys = res->start;
  86
  87         up->map.virt = ioremap_nocache(res->start, up->map.size);
  88         if (!up->map.virt) {
  89                 printk("%s: Failed to map device.\n", dp->full_name);
  90                 kfree(up);
  91
  92                 return -EINVAL;
  93         }
  94
  95         simple_map_init(&up->map);
  96
  97         /* MTD registration */
  98         up->mtd = do_map_probe("cfi_probe", &up->map);
  99         if (!up->mtd) {
 100                 iounmap(up->map.virt);
 101                 kfree(up);
 102
 103                 return -ENXIO;
 104         }
 105
 106         up->mtd->owner = THIS_MODULE;
 107
 108         add_mtd_device(up->mtd);
 109
 110         dev_set_drvdata(&edev->ofdev.dev, up);
 111
 112         return 0;
 113 }
 114
 115 static int __devinit uflash_probe(struct of_device *dev, const struct of_device_id *match)
 116 {
 117         struct linux_ebus_device *edev = to_ebus_device(&dev->dev);
 118         struct device_node *dp = dev->node;
 119
 120         if (of_find_property(dp, "user", NULL))
 121                 return -ENODEV;
 122
 123         return uflash_devinit(edev, dp);
 124 }
 125
 126 static int __devexit uflash_remove(struct of_device *dev)
 127 {
 128         struct uflash_dev *up = dev_get_drvdata(&dev->dev);
 129
 130         if (up->mtd) {
 131                 del_mtd_device(up->mtd);
 132                 map_destroy(up->mtd);
 133         }
 134         if (up->map.virt) {
 135                 iounmap(up->map.virt);
 136                 up->map.virt = NULL;
 137         }
 138
 139         kfree(up);
 140
 141         return 0;
 142 }
 143
 144 static struct of_device_id uflash_match[] = {
 145         {
 146                 .name = UFLASH_OBPNAME,
 147         },
 148         {},
 149 };
 150
 151 MODULE_DEVICE_TABLE(of, uflash_match);
 152
 153 static struct of_platform_driver uflash_driver = {
 154         .name           = UFLASH_DEVNAME,
 155         .match_table    = uflash_match,
 156         .probe          = uflash_probe,
 157         .remove         = __devexit_p(uflash_remove),
 158 };
 159
 160 static int __init uflash_init(void)
 161 {
 162         return of_register_driver(&uflash_driver, &ebus_bus_type);
 163 }
 164
 165 static void __exit uflash_exit(void)
 166 {
 167         of_unregister_driver(&uflash_driver);
 168 }
 169
 170 module_init(uflash_init);
 171 module_exit(uflash_exit);