Orange Pi5 kernel

// 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_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);