1 /* $Id: sun_uflash.c,v 1.13 2005/11/07 11:14:28 gleixner Exp $
3 * sun_uflash - Driver implementation for user-programmable flash
4 * present on many Sun Microsystems SME boardsets.
6 * This driver does NOT provide access to the OBP-flash for
7 * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
9 * Copyright (c) 2001 Eric Brower (ebrower@usa.net)
13 #include <linux/kernel.h>
14 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/init.h>
18 #include <linux/ioport.h>
20 #include <asm/oplib.h>
22 #include <asm/uaccess.h>
25 #include <linux/mtd/mtd.h>
26 #include <linux/mtd/map.h>
28 #define UFLASH_OBPNAME "flashprom"
29 #define UFLASH_DEVNAME "userflash"
31 #define UFLASH_WINDOW_SIZE 0x200000
32 #define UFLASH_BUSWIDTH 1 /* EBus is 8-bit */
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");
40 static LIST_HEAD(device_list);
42 char *name; /* device name */
43 struct map_info map; /* mtd map info */
44 struct mtd_info *mtd; /* mtd info */
48 struct map_info uflash_map_templ = {
49 .name = "SUNW,???-????",
50 .size = UFLASH_WINDOW_SIZE,
51 .bankwidth = UFLASH_BUSWIDTH,
54 int uflash_devinit(struct linux_ebus_device *edev, struct device_node *dp)
56 struct uflash_dev *up;
59 res = &edev->resource[0];
61 if (edev->num_addrs != 1) {
62 /* Non-CFI userflash device-- once I find one we
63 * can work on supporting it.
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,
73 up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
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;
81 up->name = of_get_property(dp, "model", NULL);
82 if (up->name && 0 < strlen(up->name))
83 up->map.name = up->name;
85 up->map.phys = res->start;
87 up->map.virt = ioremap_nocache(res->start, up->map.size);
89 printk("%s: Failed to map device.\n", dp->full_name);
95 simple_map_init(&up->map);
97 /* MTD registration */
98 up->mtd = do_map_probe("cfi_probe", &up->map);
100 iounmap(up->map.virt);
106 up->mtd->owner = THIS_MODULE;
108 add_mtd_device(up->mtd);
110 dev_set_drvdata(&edev->ofdev.dev, up);
115 static int __devinit uflash_probe(struct of_device *dev, const struct of_device_id *match)
117 struct linux_ebus_device *edev = to_ebus_device(&dev->dev);
118 struct device_node *dp = dev->node;
120 if (of_find_property(dp, "user", NULL))
123 return uflash_devinit(edev, dp);
126 static int __devexit uflash_remove(struct of_device *dev)
128 struct uflash_dev *up = dev_get_drvdata(&dev->dev);
131 del_mtd_device(up->mtd);
132 map_destroy(up->mtd);
135 iounmap(up->map.virt);
144 static struct of_device_id uflash_match[] = {
146 .name = UFLASH_OBPNAME,
151 MODULE_DEVICE_TABLE(of, uflash_match);
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),
160 static int __init uflash_init(void)
162 return of_register_driver(&uflash_driver, &ebus_bus_type);
165 static void __exit uflash_exit(void)
167 of_unregister_driver(&uflash_driver);
170 module_init(uflash_init);
171 module_exit(uflash_exit);