dev-flash.c

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/*
 * Broadcom BCM63xx flash registration
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2008 Maxime Bizon <[email protected]>
 * Copyright (C) 2008 Florian Fainelli <[email protected]>
 * Copyright (C) 2012 Jonas Gorski <[email protected]>
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>

#include <bcm63xx_cpu.h>
#include <bcm63xx_dev_flash.h>
#include <bcm63xx_regs.h>
#include <bcm63xx_io.h>

static struct mtd_partition mtd_partitions[] = {
    {
        .name       = "cfe",
        .offset     = 0x0,
        .size       = 0x40000,
    }
};

static const char *bcm63xx_part_types[] = { "bcm63xxpart", NULL };

static struct physmap_flash_data flash_data = {
    .width          = 2,
    .parts          = mtd_partitions,
    .part_probe_types   = bcm63xx_part_types,
};

static struct resource mtd_resources[] = {
    {
        .start      = 0,    /* filled at runtime */
        .end        = 0,    /* filled at runtime */
        .flags      = IORESOURCE_MEM,
    }
};

static struct platform_device mtd_dev = {
    .name           = "physmap-flash",
    .resource       = mtd_resources,
    .num_resources      = ARRAY_SIZE(mtd_resources),
    .dev            = {
        .platform_data  = &flash_data,
    },
};

static int __init bcm63xx_detect_flash_type(void)
{
    u32 val;

    switch (bcm63xx_get_cpu_id()) {
    case BCM6328_CPU_ID:
        val = bcm_misc_readl(MISC_STRAPBUS_6328_REG);
        if (val & STRAPBUS_6328_BOOT_SEL_SERIAL)
            return BCM63XX_FLASH_TYPE_SERIAL;
        else
            return BCM63XX_FLASH_TYPE_NAND;
    case BCM6338_CPU_ID:
    case BCM6345_CPU_ID:
    case BCM6348_CPU_ID:
        /* no way to auto detect so assume parallel */
        return BCM63XX_FLASH_TYPE_PARALLEL;
    case BCM6358_CPU_ID:
        val = bcm_gpio_readl(GPIO_STRAPBUS_REG);
        if (val & STRAPBUS_6358_BOOT_SEL_PARALLEL)
            return BCM63XX_FLASH_TYPE_PARALLEL;
        else
            return BCM63XX_FLASH_TYPE_SERIAL;
    case BCM6368_CPU_ID:
        val = bcm_gpio_readl(GPIO_STRAPBUS_REG);
        switch (val & STRAPBUS_6368_BOOT_SEL_MASK) {
        case STRAPBUS_6368_BOOT_SEL_NAND:
            return BCM63XX_FLASH_TYPE_NAND;
        case STRAPBUS_6368_BOOT_SEL_SERIAL:
            return BCM63XX_FLASH_TYPE_SERIAL;
        case STRAPBUS_6368_BOOT_SEL_PARALLEL:
            return BCM63XX_FLASH_TYPE_PARALLEL;
        }
    default:
        return -EINVAL;
    }
}

int __init bcm63xx_flash_register(void)
{
    int flash_type;
    u32 val;

    flash_type = bcm63xx_detect_flash_type();

    switch (flash_type) {
    case BCM63XX_FLASH_TYPE_PARALLEL:
        /* read base address of boot chip select (0) */
        val = bcm_mpi_readl(MPI_CSBASE_REG(0));
        val &= MPI_CSBASE_BASE_MASK;

        mtd_resources[0].start = val;
        mtd_resources[0].end = 0x1FFFFFFF;

        return platform_device_register(&mtd_dev);
    case BCM63XX_FLASH_TYPE_SERIAL:
        pr_warn("unsupported serial flash detected\n");
        return -ENODEV;
    case BCM63XX_FLASH_TYPE_NAND:
        pr_warn("unsupported NAND flash detected\n");
        return -ENODEV;
    default:
        pr_err("flash detection failed for BCM%x: %d\n",
               bcm63xx_get_cpu_id(), flash_type);
        return -ENODEV;
    }
}