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/*
*
* sun_uflash - Driver implementation for user-programmable flash
* present on many Sun Microsystems SME boardsets.
*
* This driver does NOT provide access to the OBP-flash for
* safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
*
* Copyright (c) 2001 Eric Brower (ebrower@usa.net)
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <asm/ebus.h>
#include <asm/oplib.h>
#include <asm/prom.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#define UFLASH_OBPNAME "flashprom"
#define UFLASH_DEVNAME "userflash"
#define UFLASH_WINDOW_SIZE 0x200000
#define UFLASH_BUSWIDTH 1 /* EBus is 8-bit */
MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
MODULE_SUPPORTED_DEVICE("userflash");
MODULE_LICENSE("GPL");
MODULE_VERSION("2.0");
static LIST_HEAD(device_list);
struct uflash_dev {
const char *name; /* device name */
struct map_info map; /* mtd map info */
struct mtd_info *mtd; /* mtd info */
};
struct map_info uflash_map_templ = {
.name = "SUNW,???-????",
.size = UFLASH_WINDOW_SIZE,
.bankwidth = UFLASH_BUSWIDTH,
};
int uflash_devinit(struct linux_ebus_device *edev, struct device_node *dp)
{
struct uflash_dev *up;
struct resource *res;
res = &edev->resource[0];
if (edev->num_addrs != 1) {
/* Non-CFI userflash device-- once I find one we
* can work on supporting it.
*/
printk("%s: unsupported device at 0x%llx (%d regs): " \
"email ebrower@usa.net\n",
dp->full_name, (unsigned long long)res->start,
edev->num_addrs);
return -ENODEV;
}
up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
if (!up)
return -ENOMEM;
/* copy defaults and tweak parameters */
memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));
up->map.size = (res->end - res->start) + 1UL;
up->name = of_get_property(dp, "model", NULL);
if (up->name && 0 < strlen(up->name))
up->map.name = (char *)up->name;
up->map.phys = res->start;
up->map.virt = ioremap_nocache(res->start, up->map.size);
if (!up->map.virt) {
printk("%s: Failed to map device.\n", dp->full_name);
kfree(up);
return -EINVAL;
}
simple_map_init(&up->map);
/* MTD registration */
up->mtd = do_map_probe("cfi_probe", &up->map);
if (!up->mtd) {
iounmap(up->map.virt);
kfree(up);
return -ENXIO;
}
up->mtd->owner = THIS_MODULE;
add_mtd_device(up->mtd);
dev_set_drvdata(&edev->ofdev.dev, up);
return 0;
}
static int __devinit uflash_probe(struct of_device *dev, const struct of_device_id *match)
{
struct linux_ebus_device *edev = to_ebus_device(&dev->dev);
struct device_node *dp = dev->node;
if (of_find_property(dp, "user", NULL))
return -ENODEV;
return uflash_devinit(edev, dp);
}
static int __devexit uflash_remove(struct of_device *dev)
{
struct uflash_dev *up = dev_get_drvdata(&dev->dev);
if (up->mtd) {
del_mtd_device(up->mtd);
map_destroy(up->mtd);
}
if (up->map.virt) {
iounmap(up->map.virt);
up->map.virt = NULL;
}
kfree(up);
return 0;
}
static struct of_device_id uflash_match[] = {
{
.name = UFLASH_OBPNAME,
},
{},
};
MODULE_DEVICE_TABLE(of, uflash_match);
static struct of_platform_driver uflash_driver = {
.name = UFLASH_DEVNAME,
.match_table = uflash_match,
.probe = uflash_probe,
.remove = __devexit_p(uflash_remove),
};
static int __init uflash_init(void)
{
return of_register_driver(&uflash_driver, &ebus_bus_type);
}
static void __exit uflash_exit(void)
{
of_unregister_driver(&uflash_driver);
}
module_init(uflash_init);
module_exit(uflash_exit);
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