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