1 /* sun_uflash.c - Driver for user-programmable flash on
2 * Sun Microsystems SME boardsets.
4 * This driver does NOT provide access to the OBP-flash for
5 * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
10 #include <linux/kernel.h>
11 #include <linux/module.h>
13 #include <linux/errno.h>
14 #include <linux/init.h>
15 #include <linux/ioport.h>
17 #include <linux/of_device.h>
18 #include <linux/slab.h>
20 #include <asm/uaccess.h>
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/map.h>
26 #define UFLASH_OBPNAME "flashprom"
27 #define DRIVER_NAME "sun_uflash"
28 #define PFX DRIVER_NAME ": "
30 #define UFLASH_WINDOW_SIZE 0x200000
31 #define UFLASH_BUSWIDTH 1 /* EBus is 8-bit */
34 MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
35 MODULE_SUPPORTED_DEVICE(DRIVER_NAME);
36 MODULE_LICENSE("GPL");
37 MODULE_VERSION("2.1");
40 const char *name; /* device name */
41 struct map_info map; /* mtd map info */
42 struct mtd_info *mtd; /* mtd info */
45 struct map_info uflash_map_templ = {
46 .name = "SUNW,???-????",
47 .size = UFLASH_WINDOW_SIZE,
48 .bankwidth = UFLASH_BUSWIDTH,
51 int uflash_devinit(struct platform_device *op, struct device_node *dp)
53 struct uflash_dev *up;
55 if (op->resource[1].flags) {
56 /* Non-CFI userflash device-- once I find one we
57 * can work on supporting it.
59 printk(KERN_ERR PFX "Unsupported device at %s, 0x%llx\n",
60 dp->full_name, (unsigned long long)op->resource[0].start);
65 up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
67 printk(KERN_ERR PFX "Cannot allocate struct uflash_dev\n");
71 /* copy defaults and tweak parameters */
72 memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));
74 up->map.size = resource_size(&op->resource[0]);
76 up->name = of_get_property(dp, "model", NULL);
77 if (up->name && 0 < strlen(up->name))
78 up->map.name = (char *)up->name;
80 up->map.phys = op->resource[0].start;
82 up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,
85 printk(KERN_ERR PFX "Failed to map device.\n");
91 simple_map_init(&up->map);
93 /* MTD registration */
94 up->mtd = do_map_probe("cfi_probe", &up->map);
96 of_iounmap(&op->resource[0], up->map.virt, up->map.size);
102 up->mtd->owner = THIS_MODULE;
104 add_mtd_device(up->mtd);
106 dev_set_drvdata(&op->dev, up);
111 static int __devinit uflash_probe(struct platform_device *op, const struct of_device_id *match)
113 struct device_node *dp = op->dev.of_node;
115 /* Flashprom must have the "user" property in order to
116 * be used by this driver.
118 if (!of_find_property(dp, "user", NULL))
121 return uflash_devinit(op, dp);
124 static int __devexit uflash_remove(struct platform_device *op)
126 struct uflash_dev *up = dev_get_drvdata(&op->dev);
129 del_mtd_device(up->mtd);
130 map_destroy(up->mtd);
133 of_iounmap(&op->resource[0], up->map.virt, up->map.size);
142 static const struct of_device_id uflash_match[] = {
144 .name = UFLASH_OBPNAME,
149 MODULE_DEVICE_TABLE(of, uflash_match);
151 static struct of_platform_driver uflash_driver = {
154 .owner = THIS_MODULE,
155 .of_match_table = uflash_match,
157 .probe = uflash_probe,
158 .remove = __devexit_p(uflash_remove),
161 static int __init uflash_init(void)
163 return of_register_platform_driver(&uflash_driver);
166 static void __exit uflash_exit(void)
168 of_unregister_platform_driver(&uflash_driver);
171 module_init(uflash_init);
172 module_exit(uflash_exit);