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}
132