diff options
Diffstat (limited to 'drivers/mtd/nand/spi/winbond.c')
| -rw-r--r-- | drivers/mtd/nand/spi/winbond.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c new file mode 100644 index 000000000..67baa1b32 --- /dev/null +++ b/drivers/mtd/nand/spi/winbond.c @@ -0,0 +1,141 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2017 exceet electronics GmbH + * + * Authors: + * Frieder Schrempf <frieder.schrempf@exceet.de> + * Boris Brezillon <boris.brezillon@bootlin.com> + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/mtd/spinand.h> + +#define SPINAND_MFR_WINBOND 0xEF + +#define WINBOND_CFG_BUF_READ BIT(3) + +static SPINAND_OP_VARIANTS(read_cache_variants, + SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0), + SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), + SPINAND_PAGE_READ_FROM_CACHE_DUALIO_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 w25m02gv_ooblayout_ecc(struct mtd_info *mtd, int section, + struct mtd_oob_region *region) +{ + if (section > 3) + return -ERANGE; + + region->offset = (16 * section) + 8; + region->length = 8; + + return 0; +} + +static int w25m02gv_ooblayout_free(struct mtd_info *mtd, int section, + struct mtd_oob_region *region) +{ + if (section > 3) + return -ERANGE; + + region->offset = (16 * section) + 2; + region->length = 6; + + return 0; +} + +static const struct mtd_ooblayout_ops w25m02gv_ooblayout = { + .ecc = w25m02gv_ooblayout_ecc, + .free = w25m02gv_ooblayout_free, +}; + +static int w25m02gv_select_target(struct spinand_device *spinand, + unsigned int target) +{ + struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0xc2, 1), + SPI_MEM_OP_NO_ADDR, + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_DATA_OUT(1, + spinand->scratchbuf, + 1)); + + *spinand->scratchbuf = target; + return spi_mem_exec_op(spinand->spimem, &op); +} + +static const struct spinand_info winbond_spinand_table[] = { + SPINAND_INFO("W25M02GV", 0xAB, + NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 2), + NAND_ECCREQ(1, 512), + SPINAND_INFO_OP_VARIANTS(&read_cache_variants, + &write_cache_variants, + &update_cache_variants), + 0, + SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL), + SPINAND_SELECT_TARGET(w25m02gv_select_target)), +}; + +/** + * winbond_spinand_detect - initialize device related part in spinand_device + * struct if it is a Winbond device. + * @spinand: SPI NAND device structure + */ +static int winbond_spinand_detect(struct spinand_device *spinand) +{ + u8 *id = spinand->id.data; + int ret; + + /* + * Winbond SPI NAND read ID need a dummy byte, + * so the first byte in raw_id is dummy. + */ + if (id[1] != SPINAND_MFR_WINBOND) + return 0; + + ret = spinand_match_and_init(spinand, winbond_spinand_table, + ARRAY_SIZE(winbond_spinand_table), id[2]); + if (ret) + return ret; + + return 1; +} + +static int winbond_spinand_init(struct spinand_device *spinand) +{ + struct nand_device *nand = spinand_to_nand(spinand); + unsigned int i; + + /* + * Make sure all dies are in buffer read mode and not continuous read + * mode. + */ + for (i = 0; i < nand->memorg.ntargets; i++) { + spinand_select_target(spinand, i); + spinand_upd_cfg(spinand, WINBOND_CFG_BUF_READ, + WINBOND_CFG_BUF_READ); + } + + return 0; +} + +static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = { + .detect = winbond_spinand_detect, + .init = winbond_spinand_init, +}; + +const struct spinand_manufacturer winbond_spinand_manufacturer = { + .id = SPINAND_MFR_WINBOND, + .name = "Winbond", + .ops = &winbond_spinand_manuf_ops, +}; |