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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flash_setup.c (3690B)

      1/*
      2 *   Octeon Bootbus flash setup
      3 *
      4 * This file is subject to the terms and conditions of the GNU General Public
      5 * License.  See the file "COPYING" in the main directory of this archive
      6 * for more details.
      7 *
      8 * Copyright (C) 2007, 2008 Cavium Networks
      9 */
     10#include <linux/kernel.h>
     11#include <linux/module.h>
     12#include <linux/semaphore.h>
     13#include <linux/mtd/mtd.h>
     14#include <linux/mtd/map.h>
     15#include <linux/of_platform.h>
     16#include <linux/mtd/partitions.h>
     17
     18#include <asm/octeon/octeon.h>
     19
     20static struct map_info flash_map;
     21static struct mtd_info *mymtd;
     22static const char *part_probe_types[] = {
     23	"cmdlinepart",
     24#ifdef CONFIG_MTD_REDBOOT_PARTS
     25	"RedBoot",
     26#endif
     27	NULL
     28};
     29
     30static map_word octeon_flash_map_read(struct map_info *map, unsigned long ofs)
     31{
     32	map_word r;
     33
     34	down(&octeon_bootbus_sem);
     35	r = inline_map_read(map, ofs);
     36	up(&octeon_bootbus_sem);
     37
     38	return r;
     39}
     40
     41static void octeon_flash_map_write(struct map_info *map, const map_word datum,
     42				   unsigned long ofs)
     43{
     44	down(&octeon_bootbus_sem);
     45	inline_map_write(map, datum, ofs);
     46	up(&octeon_bootbus_sem);
     47}
     48
     49static void octeon_flash_map_copy_from(struct map_info *map, void *to,
     50				       unsigned long from, ssize_t len)
     51{
     52	down(&octeon_bootbus_sem);
     53	inline_map_copy_from(map, to, from, len);
     54	up(&octeon_bootbus_sem);
     55}
     56
     57static void octeon_flash_map_copy_to(struct map_info *map, unsigned long to,
     58				     const void *from, ssize_t len)
     59{
     60	down(&octeon_bootbus_sem);
     61	inline_map_copy_to(map, to, from, len);
     62	up(&octeon_bootbus_sem);
     63}
     64
     65/*
     66 * Module/ driver initialization.
     67 *
     68 * Returns Zero on success
     69 */
     70static int octeon_flash_probe(struct platform_device *pdev)
     71{
     72	union cvmx_mio_boot_reg_cfgx region_cfg;
     73	u32 cs;
     74	int r;
     75	struct device_node *np = pdev->dev.of_node;
     76
     77	r = of_property_read_u32(np, "reg", &cs);
     78	if (r)
     79		return r;
     80
     81	/*
     82	 * Read the bootbus region 0 setup to determine the base
     83	 * address of the flash.
     84	 */
     85	region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs));
     86	if (region_cfg.s.en) {
     87		/*
     88		 * The bootloader always takes the flash and sets its
     89		 * address so the entire flash fits below
     90		 * 0x1fc00000. This way the flash aliases to
     91		 * 0x1fc00000 for booting. Software can access the
     92		 * full flash at the true address, while core boot can
     93		 * access 4MB.
     94		 */
     95		/* Use this name so old part lines work */
     96		flash_map.name = "phys_mapped_flash";
     97		flash_map.phys = region_cfg.s.base << 16;
     98		flash_map.size = 0x1fc00000 - flash_map.phys;
     99		/* 8-bit bus (0 + 1) or 16-bit bus (1 + 1) */
    100		flash_map.bankwidth = region_cfg.s.width + 1;
    101		flash_map.virt = ioremap(flash_map.phys, flash_map.size);
    102		pr_notice("Bootbus flash: Setting flash for %luMB flash at "
    103			  "0x%08llx\n", flash_map.size >> 20, flash_map.phys);
    104		WARN_ON(!map_bankwidth_supported(flash_map.bankwidth));
    105		flash_map.read = octeon_flash_map_read;
    106		flash_map.write = octeon_flash_map_write;
    107		flash_map.copy_from = octeon_flash_map_copy_from;
    108		flash_map.copy_to = octeon_flash_map_copy_to;
    109		mymtd = do_map_probe("cfi_probe", &flash_map);
    110		if (mymtd) {
    111			mymtd->owner = THIS_MODULE;
    112			mtd_device_parse_register(mymtd, part_probe_types,
    113						  NULL, NULL, 0);
    114		} else {
    115			pr_err("Failed to register MTD device for flash\n");
    116		}
    117	}
    118	return 0;
    119}
    120
    121static const struct of_device_id of_flash_match[] = {
    122	{
    123		.compatible	= "cfi-flash",
    124	},
    125	{ },
    126};
    127MODULE_DEVICE_TABLE(of, of_flash_match);
    128
    129static struct platform_driver of_flash_driver = {
    130	.driver = {
    131		.name = "octeon-of-flash",
    132		.of_match_table = of_flash_match,
    133	},
    134	.probe		= octeon_flash_probe,
    135};
    136
    137static int octeon_flash_init(void)
    138{
    139	return platform_driver_register(&of_flash_driver);
    140}
    141late_initcall(octeon_flash_init);
    142
    143MODULE_LICENSE("GPL");