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