cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

dev-flash.c (3335B)

      1/*
      2 * Broadcom BCM63xx flash registration
      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) 2008 Maxime Bizon <mbizon@freebox.fr>
      9 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
     10 * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
     11 */
     12
     13#include <linux/init.h>
     14#include <linux/kernel.h>
     15#include <linux/platform_device.h>
     16#include <linux/mtd/mtd.h>
     17#include <linux/mtd/partitions.h>
     18#include <linux/mtd/physmap.h>
     19
     20#include <bcm63xx_cpu.h>
     21#include <bcm63xx_dev_flash.h>
     22#include <bcm63xx_regs.h>
     23#include <bcm63xx_io.h>
     24
     25static struct mtd_partition mtd_partitions[] = {
     26	{
     27		.name		= "cfe",
     28		.offset		= 0x0,
     29		.size		= 0x40000,
     30	}
     31};
     32
     33static const char *bcm63xx_part_types[] = { "bcm63xxpart", NULL };
     34
     35static struct physmap_flash_data flash_data = {
     36	.width			= 2,
     37	.parts			= mtd_partitions,
     38	.part_probe_types	= bcm63xx_part_types,
     39};
     40
     41static struct resource mtd_resources[] = {
     42	{
     43		.start		= 0,	/* filled at runtime */
     44		.end		= 0,	/* filled at runtime */
     45		.flags		= IORESOURCE_MEM,
     46	}
     47};
     48
     49static struct platform_device mtd_dev = {
     50	.name			= "physmap-flash",
     51	.resource		= mtd_resources,
     52	.num_resources		= ARRAY_SIZE(mtd_resources),
     53	.dev			= {
     54		.platform_data	= &flash_data,
     55	},
     56};
     57
     58static int __init bcm63xx_detect_flash_type(void)
     59{
     60	u32 val;
     61
     62	switch (bcm63xx_get_cpu_id()) {
     63	case BCM6328_CPU_ID:
     64		val = bcm_misc_readl(MISC_STRAPBUS_6328_REG);
     65		if (val & STRAPBUS_6328_BOOT_SEL_SERIAL)
     66			return BCM63XX_FLASH_TYPE_SERIAL;
     67		else
     68			return BCM63XX_FLASH_TYPE_NAND;
     69	case BCM6338_CPU_ID:
     70	case BCM6345_CPU_ID:
     71	case BCM6348_CPU_ID:
     72		/* no way to auto detect so assume parallel */
     73		return BCM63XX_FLASH_TYPE_PARALLEL;
     74	case BCM3368_CPU_ID:
     75	case BCM6358_CPU_ID:
     76		val = bcm_gpio_readl(GPIO_STRAPBUS_REG);
     77		if (val & STRAPBUS_6358_BOOT_SEL_PARALLEL)
     78			return BCM63XX_FLASH_TYPE_PARALLEL;
     79		else
     80			return BCM63XX_FLASH_TYPE_SERIAL;
     81	case BCM6362_CPU_ID:
     82		val = bcm_misc_readl(MISC_STRAPBUS_6362_REG);
     83		if (val & STRAPBUS_6362_BOOT_SEL_SERIAL)
     84			return BCM63XX_FLASH_TYPE_SERIAL;
     85		else
     86			return BCM63XX_FLASH_TYPE_NAND;
     87	case BCM6368_CPU_ID:
     88		val = bcm_gpio_readl(GPIO_STRAPBUS_REG);
     89		switch (val & STRAPBUS_6368_BOOT_SEL_MASK) {
     90		case STRAPBUS_6368_BOOT_SEL_NAND:
     91			return BCM63XX_FLASH_TYPE_NAND;
     92		case STRAPBUS_6368_BOOT_SEL_SERIAL:
     93			return BCM63XX_FLASH_TYPE_SERIAL;
     94		case STRAPBUS_6368_BOOT_SEL_PARALLEL:
     95			return BCM63XX_FLASH_TYPE_PARALLEL;
     96		}
     97		fallthrough;
     98	default:
     99		return -EINVAL;
    100	}
    101}
    102
    103int __init bcm63xx_flash_register(void)
    104{
    105	int flash_type;
    106	u32 val;
    107
    108	flash_type = bcm63xx_detect_flash_type();
    109
    110	switch (flash_type) {
    111	case BCM63XX_FLASH_TYPE_PARALLEL:
    112		/* read base address of boot chip select (0) */
    113		val = bcm_mpi_readl(MPI_CSBASE_REG(0));
    114		val &= MPI_CSBASE_BASE_MASK;
    115
    116		mtd_resources[0].start = val;
    117		mtd_resources[0].end = 0x1FFFFFFF;
    118
    119		return platform_device_register(&mtd_dev);
    120	case BCM63XX_FLASH_TYPE_SERIAL:
    121		pr_warn("unsupported serial flash detected\n");
    122		return -ENODEV;
    123	case BCM63XX_FLASH_TYPE_NAND:
    124		pr_warn("unsupported NAND flash detected\n");
    125		return -ENODEV;
    126	default:
    127		pr_err("flash detection failed for BCM%x: %d\n",
    128		       bcm63xx_get_cpu_id(), flash_type);
    129		return -ENODEV;
    130	}
    131}