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1// SPDX-License-Identifier: GPL-2.02/*3 * Author: Mario Kicherer <dev@kicherer.org>4 */5 6#include <linux/device.h>7#include <linux/kernel.h>8#include <linux/mtd/spinand.h>9 10#define SPINAND_MFR_ALLIANCEMEMORY 0x5211 12#define AM_STATUS_ECC_BITMASK (3 << 4)13 14#define AM_STATUS_ECC_NONE_DETECTED (0 << 4)15#define AM_STATUS_ECC_CORRECTED (1 << 4)16#define AM_STATUS_ECC_ERRORED (2 << 4)17#define AM_STATUS_ECC_MAX_CORRECTED (3 << 4)18 19static SPINAND_OP_VARIANTS(read_cache_variants,20 SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, NULL, 0),21 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),22 SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),23 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),24 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),25 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));26 27static SPINAND_OP_VARIANTS(write_cache_variants,28 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),29 SPINAND_PROG_LOAD(true, 0, NULL, 0));30 31static SPINAND_OP_VARIANTS(update_cache_variants,32 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),33 SPINAND_PROG_LOAD(false, 0, NULL, 0));34 35static int am_get_eccsize(struct mtd_info *mtd)36{37 if (mtd->oobsize == 64)38 return 0x20;39 else if (mtd->oobsize == 128)40 return 0x38;41 else if (mtd->oobsize == 256)42 return 0x70;43 else44 return -EINVAL;45}46 47static int am_ooblayout_ecc(struct mtd_info *mtd, int section,48 struct mtd_oob_region *region)49{50 int ecc_bytes;51 52 ecc_bytes = am_get_eccsize(mtd);53 if (ecc_bytes < 0)54 return ecc_bytes;55 56 region->offset = mtd->oobsize - ecc_bytes;57 region->length = ecc_bytes;58 59 return 0;60}61 62static int am_ooblayout_free(struct mtd_info *mtd, int section,63 struct mtd_oob_region *region)64{65 int ecc_bytes;66 67 if (section)68 return -ERANGE;69 70 ecc_bytes = am_get_eccsize(mtd);71 if (ecc_bytes < 0)72 return ecc_bytes;73 74 /*75 * It is unclear how many bytes are used for the bad block marker. We76 * reserve the common two bytes here.77 *78 * The free area in this kind of flash is divided into chunks where the79 * first 4 bytes of each chunk are unprotected. The number of chunks80 * depends on the specific model. The models with 4096+256 bytes pages81 * have 8 chunks, the others 4 chunks.82 */83 84 region->offset = 2;85 region->length = mtd->oobsize - 2 - ecc_bytes;86 87 return 0;88}89 90static const struct mtd_ooblayout_ops am_ooblayout = {91 .ecc = am_ooblayout_ecc,92 .free = am_ooblayout_free,93};94 95static int am_ecc_get_status(struct spinand_device *spinand, u8 status)96{97 switch (status & AM_STATUS_ECC_BITMASK) {98 case AM_STATUS_ECC_NONE_DETECTED:99 return 0;100 101 case AM_STATUS_ECC_CORRECTED:102 /*103 * use oobsize to determine the flash model and the maximum of104 * correctable errors and return maximum - 1 by convention105 */106 if (spinand->base.mtd.oobsize == 64)107 return 3;108 else109 return 7;110 111 case AM_STATUS_ECC_ERRORED:112 return -EBADMSG;113 114 case AM_STATUS_ECC_MAX_CORRECTED:115 /*116 * use oobsize to determine the flash model and the maximum of117 * correctable errors118 */119 if (spinand->base.mtd.oobsize == 64)120 return 4;121 else122 return 8;123 124 default:125 break;126 }127 128 return -EINVAL;129}130 131static const struct spinand_info alliancememory_spinand_table[] = {132 SPINAND_INFO("AS5F34G04SND",133 SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x2f),134 NAND_MEMORG(1, 2048, 128, 64, 4096, 80, 1, 1, 1),135 NAND_ECCREQ(4, 512),136 SPINAND_INFO_OP_VARIANTS(&read_cache_variants,137 &write_cache_variants,138 &update_cache_variants),139 SPINAND_HAS_QE_BIT,140 SPINAND_ECCINFO(&am_ooblayout,141 am_ecc_get_status)),142};143 144static const struct spinand_manufacturer_ops alliancememory_spinand_manuf_ops = {145};146 147const struct spinand_manufacturer alliancememory_spinand_manufacturer = {148 .id = SPINAND_MFR_ALLIANCEMEMORY,149 .name = "AllianceMemory",150 .chips = alliancememory_spinand_table,151 .nchips = ARRAY_SIZE(alliancememory_spinand_table),152 .ops = &alliancememory_spinand_manuf_ops,153};154