From: Boris Brezillon boris.brezillon@bootlin.com
Add minimal support for the MX35LF1GE4AB SPI NAND chip.
Signed-off-by: Boris Brezillon boris.brezillon@bootlin.com Acked-by: Jagan Teki jagan@openedev.com --- drivers/mtd/nand/spi/Makefile | 2 +- drivers/mtd/nand/spi/core.c | 1 + drivers/mtd/nand/spi/macronix.c | 138 ++++++++++++++++++++++++++++++++ include/linux/mtd/spinand.h | 1 + 4 files changed, 141 insertions(+), 1 deletion(-) create mode 100644 drivers/mtd/nand/spi/macronix.c
diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile index 11ba5de68b..a66edd9199 100644 --- a/drivers/mtd/nand/spi/Makefile +++ b/drivers/mtd/nand/spi/Makefile @@ -1,4 +1,4 @@ # SPDX-License-Identifier: GPL-2.0
-spinand-objs := core.o micron.o winbond.o +spinand-objs := core.o macronix.o micron.o winbond.o obj-$(CONFIG_MTD_SPI_NAND) += spinand.o diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c index ef3e6445d8..362d104846 100644 --- a/drivers/mtd/nand/spi/core.c +++ b/drivers/mtd/nand/spi/core.c @@ -830,6 +830,7 @@ static const struct nand_ops spinand_ops = { };
static const struct spinand_manufacturer *spinand_manufacturers[] = { + ¯onix_spinand_manufacturer, µn_spinand_manufacturer, &winbond_spinand_manufacturer, }; diff --git a/drivers/mtd/nand/spi/macronix.c b/drivers/mtd/nand/spi/macronix.c new file mode 100644 index 0000000000..dd351dcb6c --- /dev/null +++ b/drivers/mtd/nand/spi/macronix.c @@ -0,0 +1,138 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018 Macronix + * + * Author: Boris Brezillon boris.brezillon@bootlin.com + */ + +#ifndef __UBOOT__ +#include <linux/device.h> +#include <linux/kernel.h> +#endif +#include <linux/mtd/spinand.h> + +#define SPINAND_MFR_MACRONIX 0xC2 + +static SPINAND_OP_VARIANTS(read_cache_variants, + SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), + SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0), + SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0), + SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0)); + +static SPINAND_OP_VARIANTS(write_cache_variants, + SPINAND_PROG_LOAD_X4(true, 0, NULL, 0), + SPINAND_PROG_LOAD(true, 0, NULL, 0)); + +static SPINAND_OP_VARIANTS(update_cache_variants, + SPINAND_PROG_LOAD_X4(false, 0, NULL, 0), + SPINAND_PROG_LOAD(false, 0, NULL, 0)); + +static int mx35lf1ge4ab_ooblayout_ecc(struct mtd_info *mtd, int section, + struct mtd_oob_region *region) +{ + return -ERANGE; +} + +static int mx35lf1ge4ab_ooblayout_free(struct mtd_info *mtd, int section, + struct mtd_oob_region *region) +{ + if (section) + return -ERANGE; + + region->offset = 2; + region->length = mtd->oobsize - 2; + + return 0; +} + +static const struct mtd_ooblayout_ops mx35lf1ge4ab_ooblayout = { + .ecc = mx35lf1ge4ab_ooblayout_ecc, + .free = mx35lf1ge4ab_ooblayout_free, +}; + +static int mx35lf1ge4ab_get_eccsr(struct spinand_device *spinand, u8 *eccsr) +{ + struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0x7c, 1), + SPI_MEM_OP_NO_ADDR, + SPI_MEM_OP_DUMMY(1, 1), + SPI_MEM_OP_DATA_IN(1, eccsr, 1)); + + return spi_mem_exec_op(spinand->slave, &op); +} + +static int mx35lf1ge4ab_ecc_get_status(struct spinand_device *spinand, + u8 status) +{ + struct nand_device *nand = spinand_to_nand(spinand); + u8 eccsr; + + switch (status & STATUS_ECC_MASK) { + case STATUS_ECC_NO_BITFLIPS: + return 0; + + case STATUS_ECC_UNCOR_ERROR: + return -EBADMSG; + + case STATUS_ECC_HAS_BITFLIPS: + /* + * Let's try to retrieve the real maximum number of bitflips + * in order to avoid forcing the wear-leveling layer to move + * data around if it's not necessary. + */ + if (mx35lf1ge4ab_get_eccsr(spinand, &eccsr)) + return nand->eccreq.strength; + + if (WARN_ON(eccsr > nand->eccreq.strength || !eccsr)) + return nand->eccreq.strength; + + return eccsr; + + default: + break; + } + + return -EINVAL; +} + +static const struct spinand_info macronix_spinand_table[] = { + SPINAND_INFO("MX35LF1GE4AB", 0x12, + NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 1), + NAND_ECCREQ(4, 512), + SPINAND_INFO_OP_VARIANTS(&read_cache_variants, + &write_cache_variants, + &update_cache_variants), + SPINAND_HAS_QE_BIT, + SPINAND_ECCINFO(&mx35lf1ge4ab_ooblayout, + mx35lf1ge4ab_ecc_get_status)), +}; + +static int macronix_spinand_detect(struct spinand_device *spinand) +{ + u8 *id = spinand->id.data; + int ret; + + /* + * Macronix SPI NAND read ID needs a dummy byte, so the first byte in + * raw_id is garbage. + */ + if (id[1] != SPINAND_MFR_MACRONIX) + return 0; + + ret = spinand_match_and_init(spinand, macronix_spinand_table, + ARRAY_SIZE(macronix_spinand_table), + id[2]); + if (ret) + return ret; + + return 1; +} + +static const struct spinand_manufacturer_ops macronix_spinand_manuf_ops = { + .detect = macronix_spinand_detect, +}; + +const struct spinand_manufacturer macronix_spinand_manufacturer = { + .id = SPINAND_MFR_MACRONIX, + .name = "Macronix", + .ops = ¯onix_spinand_manuf_ops, +}; diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h index d40a7c8f4e..8c9c756179 100644 --- a/include/linux/mtd/spinand.h +++ b/include/linux/mtd/spinand.h @@ -201,6 +201,7 @@ struct spinand_manufacturer { };
/* SPI NAND manufacturers */ +extern const struct spinand_manufacturer macronix_spinand_manufacturer; extern const struct spinand_manufacturer micron_spinand_manufacturer; extern const struct spinand_manufacturer winbond_spinand_manufacturer;