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// SPDX-License-Identifier: GPL-2.0-only
/* 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_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);
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