1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2021 Rockchip Electronics Co., Ltd 4 * 5 * Authors: 6 * Dingqiang Lin <jon.lin@rock-chips.com> 7 */ 8 9 #ifndef __UBOOT__ 10 #include <linux/device.h> 11 #include <linux/kernel.h> 12 #endif 13 #include <linux/mtd/spinand.h> 14 15 #define SPINAND_MFR_JSC 0xBF 16 17 static SPINAND_OP_VARIANTS(read_cache_variants, 18 SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0), 19 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), 20 SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0), 21 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0), 22 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0), 23 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0)); 24 25 static SPINAND_OP_VARIANTS(write_cache_variants, 26 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0), 27 SPINAND_PROG_LOAD(true, 0, NULL, 0)); 28 29 static SPINAND_OP_VARIANTS(update_cache_variants, 30 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0), 31 SPINAND_PROG_LOAD(false, 0, NULL, 0)); 32 33 static int js28u1gqscahg_ooblayout_ecc(struct mtd_info *mtd, int section, 34 struct mtd_oob_region *region) 35 { 36 if (section) 37 return -ERANGE; 38 39 region->offset = mtd->oobsize / 2; 40 region->length = mtd->oobsize / 2; 41 42 return 0; 43 } 44 45 static int js28u1gqscahg_ooblayout_free(struct mtd_info *mtd, int section, 46 struct mtd_oob_region *region) 47 { 48 if (section) 49 return -ERANGE; 50 51 /* Reserve 2 bytes for the BBM. */ 52 region->offset = 2; 53 region->length = mtd->oobsize / 2 - 2; 54 55 return 0; 56 } 57 58 static const struct mtd_ooblayout_ops js28u1gqscahg_ooblayout = { 59 .ecc = js28u1gqscahg_ooblayout_ecc, 60 .rfree = js28u1gqscahg_ooblayout_free, 61 }; 62 63 /* 64 * ecc bits: 0xC0[4,6] 65 * [0b000], No bit errors were detected; 66 * [0b001, 0b011], 1~3 Bit errors were detected and corrected. Not 67 * reach Flipping Bits; 68 * [0b100], Bit error count equals the bit flip 69 * detection threshold 70 * others, Reserved. 71 */ 72 static int js28u1gqscahg_ecc_get_status(struct spinand_device *spinand, 73 u8 status) 74 { 75 u8 eccsr = (status & GENMASK(6, 4)) >> 2; 76 77 if (eccsr <= 7) 78 return eccsr; 79 else if (eccsr == 12) 80 return 8; 81 else 82 return -EBADMSG; 83 } 84 85 static const struct spinand_info jsc_spinand_table[] = { 86 SPINAND_INFO("JS28U1GQSCAHG-83", 0x21, 87 NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 1), 88 NAND_ECCREQ(4, 512), 89 SPINAND_INFO_OP_VARIANTS(&read_cache_variants, 90 &write_cache_variants, 91 &update_cache_variants), 92 SPINAND_HAS_QE_BIT, 93 SPINAND_ECCINFO(&js28u1gqscahg_ooblayout, js28u1gqscahg_ecc_get_status)), 94 }; 95 96 /** 97 * jsc_spinand_detect - initialize device related part in spinand_device 98 * struct if it is a JSC device. 99 * @spinand: SPI NAND device structure 100 */ 101 static int jsc_spinand_detect(struct spinand_device *spinand) 102 { 103 u8 *id = spinand->id.data; 104 int ret; 105 106 /* 107 * JSC SPI NAND read ID need a dummy byte, 108 * so the first byte in raw_id is dummy. 109 */ 110 if (id[1] != SPINAND_MFR_JSC) 111 return 0; 112 113 ret = spinand_match_and_init(spinand, jsc_spinand_table, 114 ARRAY_SIZE(jsc_spinand_table), 115 id[2]); 116 117 if (ret) 118 return ret; 119 120 return 1; 121 } 122 123 static const struct spinand_manufacturer_ops jsc_spinand_manuf_ops = { 124 .detect = jsc_spinand_detect, 125 }; 126 127 const struct spinand_manufacturer jsc_spinand_manufacturer = { 128 .id = SPINAND_MFR_JSC, 129 .name = "JSC", 130 .ops = &jsc_spinand_manuf_ops, 131 }; 132