Add a basic driver for Micron SPI NANDs. Only one device is supported right now, but the driver will be extended to support more devices afterwards. Signed-off-by: Peter Pan <peterpandong@micron.com> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Jagan Teki <jagan@openedev.com>lime2-spi
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0a6d6bae03
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@ -1,4 +1,4 @@ |
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# SPDX-License-Identifier: GPL-2.0
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spinand-objs := core.o
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spinand-objs := core.o micron.o
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obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
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@ -0,0 +1,135 @@ |
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2016-2017 Micron Technology, Inc. |
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* |
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* Authors: |
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* Peter Pan <peterpandong@micron.com> |
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*/ |
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#ifndef __UBOOT__ |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#endif |
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#include <linux/mtd/spinand.h> |
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#define SPINAND_MFR_MICRON 0x2c |
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#define MICRON_STATUS_ECC_MASK GENMASK(7, 4) |
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#define MICRON_STATUS_ECC_NO_BITFLIPS (0 << 4) |
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#define MICRON_STATUS_ECC_1TO3_BITFLIPS (1 << 4) |
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#define MICRON_STATUS_ECC_4TO6_BITFLIPS (3 << 4) |
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#define MICRON_STATUS_ECC_7TO8_BITFLIPS (5 << 4) |
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static SPINAND_OP_VARIANTS(read_cache_variants, |
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SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0), |
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SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), |
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SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0), |
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SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0), |
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SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0), |
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SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0)); |
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static SPINAND_OP_VARIANTS(write_cache_variants, |
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SPINAND_PROG_LOAD_X4(true, 0, NULL, 0), |
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SPINAND_PROG_LOAD(true, 0, NULL, 0)); |
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static SPINAND_OP_VARIANTS(update_cache_variants, |
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SPINAND_PROG_LOAD_X4(false, 0, NULL, 0), |
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SPINAND_PROG_LOAD(false, 0, NULL, 0)); |
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static int mt29f2g01abagd_ooblayout_ecc(struct mtd_info *mtd, int section, |
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struct mtd_oob_region *region) |
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{ |
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if (section) |
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return -ERANGE; |
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region->offset = 64; |
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region->length = 64; |
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return 0; |
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} |
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static int mt29f2g01abagd_ooblayout_free(struct mtd_info *mtd, int section, |
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struct mtd_oob_region *region) |
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{ |
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if (section) |
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return -ERANGE; |
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/* Reserve 2 bytes for the BBM. */ |
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region->offset = 2; |
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region->length = 62; |
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return 0; |
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} |
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static const struct mtd_ooblayout_ops mt29f2g01abagd_ooblayout = { |
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.ecc = mt29f2g01abagd_ooblayout_ecc, |
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.free = mt29f2g01abagd_ooblayout_free, |
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}; |
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static int mt29f2g01abagd_ecc_get_status(struct spinand_device *spinand, |
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u8 status) |
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{ |
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switch (status & MICRON_STATUS_ECC_MASK) { |
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case STATUS_ECC_NO_BITFLIPS: |
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return 0; |
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case STATUS_ECC_UNCOR_ERROR: |
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return -EBADMSG; |
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case MICRON_STATUS_ECC_1TO3_BITFLIPS: |
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return 3; |
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case MICRON_STATUS_ECC_4TO6_BITFLIPS: |
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return 6; |
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case MICRON_STATUS_ECC_7TO8_BITFLIPS: |
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return 8; |
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default: |
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break; |
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} |
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return -EINVAL; |
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} |
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static const struct spinand_info micron_spinand_table[] = { |
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SPINAND_INFO("MT29F2G01ABAGD", 0x24, |
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NAND_MEMORG(1, 2048, 128, 64, 2048, 2, 1, 1), |
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NAND_ECCREQ(8, 512), |
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SPINAND_INFO_OP_VARIANTS(&read_cache_variants, |
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&write_cache_variants, |
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&update_cache_variants), |
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0, |
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SPINAND_ECCINFO(&mt29f2g01abagd_ooblayout, |
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mt29f2g01abagd_ecc_get_status)), |
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}; |
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static int micron_spinand_detect(struct spinand_device *spinand) |
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{ |
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u8 *id = spinand->id.data; |
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int ret; |
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/*
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* Micron SPI NAND read ID need a dummy byte, |
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* so the first byte in raw_id is dummy. |
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*/ |
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if (id[1] != SPINAND_MFR_MICRON) |
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return 0; |
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ret = spinand_match_and_init(spinand, micron_spinand_table, |
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ARRAY_SIZE(micron_spinand_table), id[2]); |
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if (ret) |
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return ret; |
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return 1; |
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} |
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static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = { |
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.detect = micron_spinand_detect, |
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}; |
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const struct spinand_manufacturer micron_spinand_manufacturer = { |
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.id = SPINAND_MFR_MICRON, |
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.name = "Micron", |
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.ops = µn_spinand_manuf_ops, |
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}; |
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