142 lines
3.5 KiB
C
Executable file
142 lines
3.5 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2017 exceet electronics GmbH
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*
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* Authors:
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* Frieder Schrempf <frieder.schrempf@exceet.de>
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* Boris Brezillon <boris.brezillon@bootlin.com>
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/mtd/spinand.h>
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#define SPINAND_MFR_WINBOND 0xEF
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#define WINBOND_CFG_BUF_READ BIT(3)
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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 w25m02gv_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 > 3)
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return -ERANGE;
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region->offset = (16 * section) + 8;
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region->length = 8;
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return 0;
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}
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static int w25m02gv_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 > 3)
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return -ERANGE;
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region->offset = (16 * section) + 2;
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region->length = 6;
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return 0;
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}
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static const struct mtd_ooblayout_ops w25m02gv_ooblayout = {
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.ecc = w25m02gv_ooblayout_ecc,
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.free = w25m02gv_ooblayout_free,
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};
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static int w25m02gv_select_target(struct spinand_device *spinand,
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unsigned int target)
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{
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struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0xc2, 1),
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SPI_MEM_OP_NO_ADDR,
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SPI_MEM_OP_NO_DUMMY,
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SPI_MEM_OP_DATA_OUT(1,
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spinand->scratchbuf,
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1));
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*spinand->scratchbuf = target;
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return spi_mem_exec_op(spinand->spimem, &op);
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}
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static const struct spinand_info winbond_spinand_table[] = {
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SPINAND_INFO("W25M02GV", 0xAB,
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NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 2),
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NAND_ECCREQ(1, 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(&w25m02gv_ooblayout, NULL),
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SPINAND_SELECT_TARGET(w25m02gv_select_target)),
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};
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/**
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* winbond_spinand_detect - initialize device related part in spinand_device
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* struct if it is a Winbond device.
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* @spinand: SPI NAND device structure
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*/
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static int winbond_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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* Winbond 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_WINBOND)
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return 0;
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ret = spinand_match_and_init(spinand, winbond_spinand_table,
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ARRAY_SIZE(winbond_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 int winbond_spinand_init(struct spinand_device *spinand)
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{
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struct nand_device *nand = spinand_to_nand(spinand);
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unsigned int i;
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/*
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* Make sure all dies are in buffer read mode and not continuous read
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* mode.
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*/
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for (i = 0; i < nand->memorg.ntargets; i++) {
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spinand_select_target(spinand, i);
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spinand_upd_cfg(spinand, WINBOND_CFG_BUF_READ,
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WINBOND_CFG_BUF_READ);
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}
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return 0;
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}
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static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
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.detect = winbond_spinand_detect,
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.init = winbond_spinand_init,
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};
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const struct spinand_manufacturer winbond_spinand_manufacturer = {
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.id = SPINAND_MFR_WINBOND,
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.name = "Winbond",
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.ops = &winbond_spinand_manuf_ops,
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};
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