| // 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)), |
| SPINAND_INFO("W25N01GV", 0xAA, |
| NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 1), |
| NAND_ECCREQ(1, 512), |
| SPINAND_INFO_OP_VARIANTS(&read_cache_variants, |
| &write_cache_variants, |
| &update_cache_variants), |
| 0, |
| SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)), |
| }; |
| |
| /** |
| * 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, |
| }; |