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 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 } 102 103 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