1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2017 exceet electronics GmbH 4 * 5 * Authors: 6 * Frieder Schrempf <frieder.schrempf@exceet.de> 7 * Boris Brezillon <boris.brezillon@bootlin.com> 8 */ 9 10 #ifndef __UBOOT__ 11 #include <linux/device.h> 12 #include <linux/kernel.h> 13 #endif 14 #include <linux/mtd/spinand.h> 15 16 #define SPINAND_MFR_WINBOND 0xEF 17 18 #define WINBOND_CFG_BUF_READ BIT(3) 19 20 static SPINAND_OP_VARIANTS(read_cache_variants, 21 SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0), 22 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), 23 SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0), 24 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0), 25 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0), 26 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0)); 27 28 static SPINAND_OP_VARIANTS(write_cache_variants, 29 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0), 30 SPINAND_PROG_LOAD(true, 0, NULL, 0)); 31 32 static SPINAND_OP_VARIANTS(update_cache_variants, 33 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0), 34 SPINAND_PROG_LOAD(false, 0, NULL, 0)); 35 36 static int w25m02gv_ooblayout_ecc(struct mtd_info *mtd, int section, 37 struct mtd_oob_region *region) 38 { 39 if (section > 3) 40 return -ERANGE; 41 42 region->offset = (16 * section) + 8; 43 region->length = 8; 44 45 return 0; 46 } 47 48 static int w25m02gv_ooblayout_free(struct mtd_info *mtd, int section, 49 struct mtd_oob_region *region) 50 { 51 if (section > 3) 52 return -ERANGE; 53 54 region->offset = (16 * section) + 2; 55 region->length = 6; 56 57 return 0; 58 } 59 60 static const struct mtd_ooblayout_ops w25m02gv_ooblayout = { 61 .ecc = w25m02gv_ooblayout_ecc, 62 .free = w25m02gv_ooblayout_free, 63 }; 64 65 static int w25m02gv_select_target(struct spinand_device *spinand, 66 unsigned int target) 67 { 68 struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0xc2, 1), 69 SPI_MEM_OP_NO_ADDR, 70 SPI_MEM_OP_NO_DUMMY, 71 SPI_MEM_OP_DATA_OUT(1, 72 spinand->scratchbuf, 73 1)); 74 75 *spinand->scratchbuf = target; 76 return spi_mem_exec_op(spinand->slave, &op); 77 } 78 79 static const struct spinand_info winbond_spinand_table[] = { 80 SPINAND_INFO("W25M02GV", 0xAB, 81 NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 2), 82 NAND_ECCREQ(1, 512), 83 SPINAND_INFO_OP_VARIANTS(&read_cache_variants, 84 &write_cache_variants, 85 &update_cache_variants), 86 0, 87 SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL), 88 SPINAND_SELECT_TARGET(w25m02gv_select_target)), 89 }; 90 91 /** 92 * winbond_spinand_detect - initialize device related part in spinand_device 93 * struct if it is a Winbond device. 94 * @spinand: SPI NAND device structure 95 */ 96 static int winbond_spinand_detect(struct spinand_device *spinand) 97 { 98 u8 *id = spinand->id.data; 99 int ret; 100 101 /* 102 * Winbond SPI NAND read ID need a dummy byte, 103 * so the first byte in raw_id is dummy. 104 */ 105 if (id[1] != SPINAND_MFR_WINBOND) 106 return 0; 107 108 ret = spinand_match_and_init(spinand, winbond_spinand_table, 109 ARRAY_SIZE(winbond_spinand_table), id[2]); 110 if (ret) 111 return ret; 112 113 return 1; 114 } 115 116 static int winbond_spinand_init(struct spinand_device *spinand) 117 { 118 struct nand_device *nand = spinand_to_nand(spinand); 119 unsigned int i; 120 121 /* 122 * Make sure all dies are in buffer read mode and not continuous read 123 * mode. 124 */ 125 for (i = 0; i < nand->memorg.ntargets; i++) { 126 spinand_select_target(spinand, i); 127 spinand_upd_cfg(spinand, WINBOND_CFG_BUF_READ, 128 WINBOND_CFG_BUF_READ); 129 } 130 131 return 0; 132 } 133 134 static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = { 135 .detect = winbond_spinand_detect, 136 .init = winbond_spinand_init, 137 }; 138 139 const struct spinand_manufacturer winbond_spinand_manufacturer = { 140 .id = SPINAND_MFR_WINBOND, 141 .name = "Winbond", 142 .ops = &winbond_spinand_manuf_ops, 143 }; 144