160 lines
3.5 KiB
C
160 lines
3.5 KiB
C
/* sun_uflash.c - Driver for user-programmable flash on
|
|
* 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/ioport.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/prom.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/io.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
|
|
#define UFLASH_OBPNAME "flashprom"
|
|
#define DRIVER_NAME "sun_uflash"
|
|
#define PFX DRIVER_NAME ": "
|
|
|
|
#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(DRIVER_NAME);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION("2.1");
|
|
|
|
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 platform_device *op, struct device_node *dp)
|
|
{
|
|
struct uflash_dev *up;
|
|
|
|
if (op->resource[1].flags) {
|
|
/* Non-CFI userflash device-- once I find one we
|
|
* can work on supporting it.
|
|
*/
|
|
printk(KERN_ERR PFX "Unsupported device at %pOF, 0x%llx\n",
|
|
dp, (unsigned long long)op->resource[0].start);
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
|
|
if (!up) {
|
|
printk(KERN_ERR PFX "Cannot allocate struct uflash_dev\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* copy defaults and tweak parameters */
|
|
memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));
|
|
|
|
up->map.size = resource_size(&op->resource[0]);
|
|
|
|
up->name = of_get_property(dp, "model", NULL);
|
|
if (up->name && 0 < strlen(up->name))
|
|
up->map.name = up->name;
|
|
|
|
up->map.phys = op->resource[0].start;
|
|
|
|
up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,
|
|
DRIVER_NAME);
|
|
if (!up->map.virt) {
|
|
printk(KERN_ERR PFX "Failed to map device.\n");
|
|
kfree(up);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
simple_map_init(&up->map);
|
|
|
|
/* MTD registration */
|
|
up->mtd = do_map_probe("cfi_probe", &up->map);
|
|
if (!up->mtd) {
|
|
of_iounmap(&op->resource[0], up->map.virt, up->map.size);
|
|
kfree(up);
|
|
|
|
return -ENXIO;
|
|
}
|
|
|
|
up->mtd->owner = THIS_MODULE;
|
|
|
|
mtd_device_register(up->mtd, NULL, 0);
|
|
|
|
dev_set_drvdata(&op->dev, up);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uflash_probe(struct platform_device *op)
|
|
{
|
|
struct device_node *dp = op->dev.of_node;
|
|
|
|
/* Flashprom must have the "user" property in order to
|
|
* be used by this driver.
|
|
*/
|
|
if (!of_find_property(dp, "user", NULL))
|
|
return -ENODEV;
|
|
|
|
return uflash_devinit(op, dp);
|
|
}
|
|
|
|
static int uflash_remove(struct platform_device *op)
|
|
{
|
|
struct uflash_dev *up = dev_get_drvdata(&op->dev);
|
|
|
|
if (up->mtd) {
|
|
mtd_device_unregister(up->mtd);
|
|
map_destroy(up->mtd);
|
|
}
|
|
if (up->map.virt) {
|
|
of_iounmap(&op->resource[0], up->map.virt, up->map.size);
|
|
up->map.virt = NULL;
|
|
}
|
|
|
|
kfree(up);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id uflash_match[] = {
|
|
{
|
|
.name = UFLASH_OBPNAME,
|
|
},
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, uflash_match);
|
|
|
|
static struct platform_driver uflash_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = uflash_match,
|
|
},
|
|
.probe = uflash_probe,
|
|
.remove = uflash_remove,
|
|
};
|
|
|
|
module_platform_driver(uflash_driver);
|