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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ts5500_flash.c (2177B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * ts5500_flash.c -- MTD map driver for Technology Systems TS-5500 board
      4 *
      5 * Copyright (C) 2004 Sean Young <sean@mess.org>
      6 *
      7 * Note:
      8 * - In order for detection to work, jumper 3 must be set.
      9 * - Drive A and B use the resident flash disk (RFD) flash translation layer.
     10 * - If you have created your own jffs file system and the bios overwrites
     11 *   it during boot, try disabling Drive A: and B: in the boot order.
     12 */
     13
     14#include <linux/init.h>
     15#include <linux/module.h>
     16#include <linux/kernel.h>
     17#include <linux/mtd/map.h>
     18#include <linux/mtd/mtd.h>
     19#include <linux/mtd/partitions.h>
     20#include <linux/types.h>
     21
     22
     23#define WINDOW_ADDR	0x09400000
     24#define WINDOW_SIZE	0x00200000
     25
     26static struct map_info ts5500_map = {
     27	.name = "TS-5500 Flash",
     28	.size = WINDOW_SIZE,
     29	.bankwidth = 1,
     30	.phys = WINDOW_ADDR
     31};
     32
     33static const struct mtd_partition ts5500_partitions[] = {
     34	{
     35		.name = "Drive A",
     36		.offset = 0,
     37		.size = 0x0e0000
     38	},
     39	{
     40		.name = "BIOS",
     41		.offset = 0x0e0000,
     42		.size = 0x020000,
     43	},
     44	{
     45		.name = "Drive B",
     46		.offset = 0x100000,
     47		.size = 0x100000
     48	}
     49};
     50
     51#define NUM_PARTITIONS ARRAY_SIZE(ts5500_partitions)
     52
     53static struct mtd_info *mymtd;
     54
     55static int __init init_ts5500_map(void)
     56{
     57	int rc = 0;
     58
     59	ts5500_map.virt = ioremap(ts5500_map.phys, ts5500_map.size);
     60
     61	if (!ts5500_map.virt) {
     62		printk(KERN_ERR "Failed to ioremap\n");
     63		rc = -EIO;
     64		goto err2;
     65	}
     66
     67	simple_map_init(&ts5500_map);
     68
     69	mymtd = do_map_probe("jedec_probe", &ts5500_map);
     70	if (!mymtd)
     71		mymtd = do_map_probe("map_rom", &ts5500_map);
     72
     73	if (!mymtd) {
     74		rc = -ENXIO;
     75		goto err1;
     76	}
     77
     78	mymtd->owner = THIS_MODULE;
     79	mtd_device_register(mymtd, ts5500_partitions, NUM_PARTITIONS);
     80
     81	return 0;
     82
     83err1:
     84	iounmap(ts5500_map.virt);
     85err2:
     86	return rc;
     87}
     88
     89static void __exit cleanup_ts5500_map(void)
     90{
     91	if (mymtd) {
     92		mtd_device_unregister(mymtd);
     93		map_destroy(mymtd);
     94	}
     95
     96	if (ts5500_map.virt) {
     97		iounmap(ts5500_map.virt);
     98		ts5500_map.virt = NULL;
     99	}
    100}
    101
    102module_init(init_ts5500_map);
    103module_exit(cleanup_ts5500_map);
    104
    105MODULE_LICENSE("GPL");
    106MODULE_AUTHOR("Sean Young <sean@mess.org>");
    107MODULE_DESCRIPTION("MTD map driver for Technology Systems TS-5500 board");
    108