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
25 static struct mtd_partition mtd_partitions[] = {
26 {
27 .name = "cfe",
28 .offset = 0x0,
29 .size = 0x40000,
30 }
31 };
32
33 static const char *bcm63xx_part_types[] = { "bcm63xxpart", NULL };
34
35 static struct physmap_flash_data flash_data = {
36 .width = 2,
37 .parts = mtd_partitions,
38 .part_probe_types = bcm63xx_part_types,
39 };
40
41 static struct resource mtd_resources[] = {
42 {
43 .start = 0, /* filled at runtime */
44 .end = 0, /* filled at runtime */
45 .flags = IORESOURCE_MEM,
46 }
47 };
48
49 static 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
bcm63xx_detect_flash_type(void)58 static 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
bcm63xx_flash_register(void)103 int __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