cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sun_uflash.c (3529B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* sun_uflash.c - Driver for user-programmable flash on
      3 *                Sun Microsystems SME boardsets.
      4 *
      5 * This driver does NOT provide access to the OBP-flash for
      6 * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
      7 *
      8 * Copyright (c) 2001 Eric Brower (ebrower@usa.net)
      9 */
     10
     11#include <linux/kernel.h>
     12#include <linux/module.h>
     13#include <linux/fs.h>
     14#include <linux/errno.h>
     15#include <linux/ioport.h>
     16#include <linux/of.h>
     17#include <linux/of_device.h>
     18#include <linux/slab.h>
     19#include <asm/prom.h>
     20#include <linux/uaccess.h>
     21#include <asm/io.h>
     22
     23#include <linux/mtd/mtd.h>
     24#include <linux/mtd/map.h>
     25
     26#define UFLASH_OBPNAME	"flashprom"
     27#define DRIVER_NAME	"sun_uflash"
     28#define PFX		DRIVER_NAME ": "
     29
     30#define UFLASH_WINDOW_SIZE	0x200000
     31#define UFLASH_BUSWIDTH		1			/* EBus is 8-bit */
     32
     33MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
     34MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
     35MODULE_LICENSE("GPL");
     36MODULE_VERSION("2.1");
     37
     38struct uflash_dev {
     39	const char		*name;	/* device name */
     40	struct map_info 	map;	/* mtd map info */
     41	struct mtd_info		*mtd;	/* mtd info */
     42};
     43
     44struct map_info uflash_map_templ = {
     45	.name =		"SUNW,???-????",
     46	.size =		UFLASH_WINDOW_SIZE,
     47	.bankwidth =	UFLASH_BUSWIDTH,
     48};
     49
     50int uflash_devinit(struct platform_device *op, struct device_node *dp)
     51{
     52	struct uflash_dev *up;
     53
     54	if (op->resource[1].flags) {
     55		/* Non-CFI userflash device-- once I find one we
     56		 * can work on supporting it.
     57		 */
     58		printk(KERN_ERR PFX "Unsupported device at %pOF, 0x%llx\n",
     59		       dp, (unsigned long long)op->resource[0].start);
     60
     61		return -ENODEV;
     62	}
     63
     64	up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
     65	if (!up)
     66		return -ENOMEM;
     67
     68	/* copy defaults and tweak parameters */
     69	memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));
     70
     71	up->map.size = resource_size(&op->resource[0]);
     72
     73	up->name = of_get_property(dp, "model", NULL);
     74	if (up->name && 0 < strlen(up->name))
     75		up->map.name = up->name;
     76
     77	up->map.phys = op->resource[0].start;
     78
     79	up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,
     80				  DRIVER_NAME);
     81	if (!up->map.virt) {
     82		printk(KERN_ERR PFX "Failed to map device.\n");
     83		kfree(up);
     84
     85		return -EINVAL;
     86	}
     87
     88	simple_map_init(&up->map);
     89
     90	/* MTD registration */
     91	up->mtd = do_map_probe("cfi_probe", &up->map);
     92	if (!up->mtd) {
     93		of_iounmap(&op->resource[0], up->map.virt, up->map.size);
     94		kfree(up);
     95
     96		return -ENXIO;
     97	}
     98
     99	up->mtd->owner = THIS_MODULE;
    100
    101	mtd_device_register(up->mtd, NULL, 0);
    102
    103	dev_set_drvdata(&op->dev, up);
    104
    105	return 0;
    106}
    107
    108static int uflash_probe(struct platform_device *op)
    109{
    110	struct device_node *dp = op->dev.of_node;
    111
    112	/* Flashprom must have the "user" property in order to
    113	 * be used by this driver.
    114	 */
    115	if (!of_find_property(dp, "user", NULL))
    116		return -ENODEV;
    117
    118	return uflash_devinit(op, dp);
    119}
    120
    121static int uflash_remove(struct platform_device *op)
    122{
    123	struct uflash_dev *up = dev_get_drvdata(&op->dev);
    124
    125	if (up->mtd) {
    126		mtd_device_unregister(up->mtd);
    127		map_destroy(up->mtd);
    128	}
    129	if (up->map.virt) {
    130		of_iounmap(&op->resource[0], up->map.virt, up->map.size);
    131		up->map.virt = NULL;
    132	}
    133
    134	kfree(up);
    135
    136	return 0;
    137}
    138
    139static const struct of_device_id uflash_match[] = {
    140	{
    141		.name = UFLASH_OBPNAME,
    142	},
    143	{},
    144};
    145
    146MODULE_DEVICE_TABLE(of, uflash_match);
    147
    148static struct platform_driver uflash_driver = {
    149	.driver = {
    150		.name = DRIVER_NAME,
    151		.of_match_table = uflash_match,
    152	},
    153	.probe		= uflash_probe,
    154	.remove		= uflash_remove,
    155};
    156
    157module_platform_driver(uflash_driver);