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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 <mbizon@freebox.fr>
* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
* Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
*/
#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 BCM3368_CPU_ID:
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 BCM6362_CPU_ID:
val = bcm_misc_readl(MISC_STRAPBUS_6362_REG);
if (val & STRAPBUS_6362_BOOT_SEL_SERIAL)
return BCM63XX_FLASH_TYPE_SERIAL;
else
return BCM63XX_FLASH_TYPE_NAND;
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;
}
fallthrough;
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;
}
}
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