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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impa7.c (2747B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Handle mapping of the NOR flash on implementa A7 boards
      4 *
      5 * Copyright 2002 SYSGO Real-Time Solutions GmbH
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/types.h>
     10#include <linux/kernel.h>
     11#include <linux/init.h>
     12#include <asm/io.h>
     13#include <linux/mtd/mtd.h>
     14#include <linux/mtd/map.h>
     15#include <linux/mtd/partitions.h>
     16
     17#define WINDOW_ADDR0 0x00000000      /* physical properties of flash */
     18#define WINDOW_SIZE0 0x00800000
     19#define WINDOW_ADDR1 0x10000000      /* physical properties of flash */
     20#define WINDOW_SIZE1 0x00800000
     21#define NUM_FLASHBANKS 2
     22#define BUSWIDTH     4
     23
     24#define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
     25#define MTDID      "impa7-%d"  /* for mtdparts= partitioning */
     26
     27static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
     28
     29static const char * const rom_probe_types[] = { "jedec_probe", NULL };
     30
     31static struct map_info impa7_map[NUM_FLASHBANKS] = {
     32	{
     33		.name = "impA7 NOR Flash Bank #0",
     34		.size = WINDOW_SIZE0,
     35		.bankwidth = BUSWIDTH,
     36	},
     37	{
     38		.name = "impA7 NOR Flash Bank #1",
     39		.size = WINDOW_SIZE1,
     40		.bankwidth = BUSWIDTH,
     41	},
     42};
     43
     44/*
     45 * MTD partitioning stuff
     46 */
     47static const struct mtd_partition partitions[] =
     48{
     49	{
     50		.name = "FileSystem",
     51		.size = 0x800000,
     52		.offset = 0x00000000
     53	},
     54};
     55
     56static int __init init_impa7(void)
     57{
     58	const char * const *type;
     59	int i;
     60	static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
     61	  { WINDOW_ADDR0, WINDOW_SIZE0 },
     62	  { WINDOW_ADDR1, WINDOW_SIZE1 },
     63        };
     64	int devicesfound = 0;
     65
     66	for(i=0; i<NUM_FLASHBANKS; i++)
     67	{
     68		printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
     69		       pt[i].size, pt[i].addr);
     70
     71		impa7_map[i].phys = pt[i].addr;
     72		impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
     73		if (!impa7_map[i].virt) {
     74			printk(MSG_PREFIX "failed to ioremap\n");
     75			return -EIO;
     76		}
     77		simple_map_init(&impa7_map[i]);
     78
     79		impa7_mtd[i] = NULL;
     80		type = rom_probe_types;
     81		for(; !impa7_mtd[i] && *type; type++) {
     82			impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
     83		}
     84
     85		if (impa7_mtd[i]) {
     86			impa7_mtd[i]->owner = THIS_MODULE;
     87			devicesfound++;
     88			mtd_device_register(impa7_mtd[i], partitions,
     89					    ARRAY_SIZE(partitions));
     90		} else {
     91			iounmap((void __iomem *)impa7_map[i].virt);
     92		}
     93	}
     94	return devicesfound == 0 ? -ENXIO : 0;
     95}
     96
     97static void __exit cleanup_impa7(void)
     98{
     99	int i;
    100	for (i=0; i<NUM_FLASHBANKS; i++) {
    101		if (impa7_mtd[i]) {
    102			mtd_device_unregister(impa7_mtd[i]);
    103			map_destroy(impa7_mtd[i]);
    104			iounmap((void __iomem *)impa7_map[i].virt);
    105			impa7_map[i].virt = NULL;
    106		}
    107	}
    108}
    109
    110module_init(init_impa7);
    111module_exit(cleanup_impa7);
    112
    113MODULE_LICENSE("GPL");
    114MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
    115MODULE_DESCRIPTION("MTD map driver for implementa impA7");