1 /* 2 * Broadcom specific AMBA 3 * ChipCommon serial flash interface 4 * 5 * Licensed under the GNU/GPL. See COPYING for details. 6 */ 7 8 #include "bcma_private.h" 9 10 #include <linux/platform_device.h> 11 #include <linux/bcma/bcma.h> 12 13 static struct resource bcma_sflash_resource = { 14 .name = "bcma_sflash", 15 .start = BCMA_SOC_FLASH2, 16 .end = 0, 17 .flags = IORESOURCE_MEM | IORESOURCE_READONLY, 18 }; 19 20 struct platform_device bcma_sflash_dev = { 21 .name = "bcma_sflash", 22 .resource = &bcma_sflash_resource, 23 .num_resources = 1, 24 }; 25 26 struct bcma_sflash_tbl_e { 27 char *name; 28 u32 id; 29 u32 blocksize; 30 u16 numblocks; 31 }; 32 33 static const struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = { 34 { "M25P20", 0x11, 0x10000, 4, }, 35 { "M25P40", 0x12, 0x10000, 8, }, 36 37 { "M25P16", 0x14, 0x10000, 32, }, 38 { "M25P32", 0x15, 0x10000, 64, }, 39 { "M25P64", 0x16, 0x10000, 128, }, 40 { "M25FL128", 0x17, 0x10000, 256, }, 41 { "MX25L25635F", 0x18, 0x10000, 512, }, 42 { NULL }, 43 }; 44 45 static const struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = { 46 { "SST25WF512", 1, 0x1000, 16, }, 47 { "SST25VF512", 0x48, 0x1000, 16, }, 48 { "SST25WF010", 2, 0x1000, 32, }, 49 { "SST25VF010", 0x49, 0x1000, 32, }, 50 { "SST25WF020", 3, 0x1000, 64, }, 51 { "SST25VF020", 0x43, 0x1000, 64, }, 52 { "SST25WF040", 4, 0x1000, 128, }, 53 { "SST25VF040", 0x44, 0x1000, 128, }, 54 { "SST25VF040B", 0x8d, 0x1000, 128, }, 55 { "SST25WF080", 5, 0x1000, 256, }, 56 { "SST25VF080B", 0x8e, 0x1000, 256, }, 57 { "SST25VF016", 0x41, 0x1000, 512, }, 58 { "SST25VF032", 0x4a, 0x1000, 1024, }, 59 { "SST25VF064", 0x4b, 0x1000, 2048, }, 60 { NULL }, 61 }; 62 63 static const struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = { 64 { "AT45DB011", 0xc, 256, 512, }, 65 { "AT45DB021", 0x14, 256, 1024, }, 66 { "AT45DB041", 0x1c, 256, 2048, }, 67 { "AT45DB081", 0x24, 256, 4096, }, 68 { "AT45DB161", 0x2c, 512, 4096, }, 69 { "AT45DB321", 0x34, 512, 8192, }, 70 { "AT45DB642", 0x3c, 1024, 8192, }, 71 { NULL }, 72 }; 73 74 static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode) 75 { 76 int i; 77 bcma_cc_write32(cc, BCMA_CC_FLASHCTL, 78 BCMA_CC_FLASHCTL_START | opcode); 79 for (i = 0; i < 1000; i++) { 80 if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) & 81 BCMA_CC_FLASHCTL_BUSY)) 82 return; 83 cpu_relax(); 84 } 85 bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n"); 86 } 87 88 /* Initialize serial flash access */ 89 int bcma_sflash_init(struct bcma_drv_cc *cc) 90 { 91 struct bcma_bus *bus = cc->core->bus; 92 struct bcma_sflash *sflash = &cc->sflash; 93 const struct bcma_sflash_tbl_e *e; 94 u32 id, id2; 95 96 switch (cc->capabilities & BCMA_CC_CAP_FLASHT) { 97 case BCMA_CC_FLASHT_STSER: 98 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP); 99 100 bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0); 101 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES); 102 id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA); 103 104 bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1); 105 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES); 106 id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA); 107 108 switch (id) { 109 case 0xbf: 110 for (e = bcma_sflash_sst_tbl; e->name; e++) { 111 if (e->id == id2) 112 break; 113 } 114 break; 115 case 0x13: 116 return -ENOTSUPP; 117 default: 118 for (e = bcma_sflash_st_tbl; e->name; e++) { 119 if (e->id == id) 120 break; 121 } 122 break; 123 } 124 if (!e->name) { 125 bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2); 126 return -ENOTSUPP; 127 } 128 129 break; 130 case BCMA_CC_FLASHT_ATSER: 131 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS); 132 id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c; 133 134 for (e = bcma_sflash_at_tbl; e->name; e++) { 135 if (e->id == id) 136 break; 137 } 138 if (!e->name) { 139 bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id); 140 return -ENOTSUPP; 141 } 142 143 break; 144 default: 145 bcma_err(bus, "Unsupported flash type\n"); 146 return -ENOTSUPP; 147 } 148 149 sflash->blocksize = e->blocksize; 150 sflash->numblocks = e->numblocks; 151 sflash->size = sflash->blocksize * sflash->numblocks; 152 sflash->present = true; 153 154 bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n", 155 e->name, sflash->size / 1024, sflash->blocksize, 156 sflash->numblocks); 157 158 /* Prepare platform device, but don't register it yet. It's too early, 159 * malloc (required by device_private_init) is not available yet. */ 160 bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start + 161 sflash->size; 162 bcma_sflash_dev.dev.platform_data = sflash; 163 164 return 0; 165 } 166