mtd: spinand: Support biwin

BWJX08K

Change-Id: I0e269e47b264190951c19f4315706b40d3b765e5
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

drivers/mtd/nand/spi/Makefile

@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
-spinand-objs := core.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o
+spinand-objs := biwin.o core.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o
 obj-$(CONFIG_MTD_SPI_NAND) += spinand.o

drivers/mtd/nand/spi/biwin.c

@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2021 Rockchip Electronics Co., Ltd.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mtd/spinand.h>
+
+#define SPINAND_MFR_BIWIN		0xBC
+
+#define BIWIN_CFG_BUF_READ		BIT(3)
+#define BIWIN_STATUS_ECC_HAS_BITFLIPS_T	(3 << 4)
+
+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 bwjx08k_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *region)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	region->offset = (16 * section) + 12;
+	region->length = 4;
+
+	return 0;
+}
+
+static int bwjx08k_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 = 10;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops bwjx08k_ooblayout = {
+	.ecc = bwjx08k_ooblayout_ecc,
+	.free = bwjx08k_ooblayout_free,
+};
+
+static int bwjx08k_ecc_get_status(struct spinand_device *spinand,
+				  u8 status)
+{
+	struct nand_device *nand = spinand_to_nand(spinand);
+
+	switch (status & STATUS_ECC_MASK) {
+	case STATUS_ECC_NO_BITFLIPS:
+		return 0;
+
+	case STATUS_ECC_UNCOR_ERROR:
+		return -EBADMSG;
+
+	case STATUS_ECC_HAS_BITFLIPS:
+		return 1;
+
+	default:
+		return nanddev_get_ecc_conf(nand)->strength;
+	}
+
+	return -EINVAL;
+}
+
+/* Another set for the same id[2] devices in one series */
+static const struct spinand_info biwin_spinand_table[] = {
+	SPINAND_INFO("BWJX08K",
+		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xB3),
+		     NAND_MEMORG(1, 2048, 64, 64, 2048, 40, 1, 1, 1),
+		     NAND_ECCREQ(8, 512),
+		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+					      &write_cache_variants,
+					      &update_cache_variants),
+		     SPINAND_HAS_QE_BIT,
+		     SPINAND_ECCINFO(&bwjx08k_ooblayout,
+				     bwjx08k_ecc_get_status)),
+};
+
+static const struct spinand_manufacturer_ops biwin_spinand_manuf_ops = {
+};
+
+const struct spinand_manufacturer biwin_spinand_manufacturer = {
+	.id = SPINAND_MFR_BIWIN,
+	.name = "BIWIN",
+	.chips = biwin_spinand_table,
+	.nchips = ARRAY_SIZE(biwin_spinand_table),
+	.ops = &biwin_spinand_manuf_ops,
+};

drivers/mtd/nand/spi/core.c

@@ -849,6 +849,7 @@ static const struct nand_ops spinand_ops = {
 };
 
 static const struct spinand_manufacturer *spinand_manufacturers[] = {
+	&biwin_spinand_manufacturer,
 	&gigadevice_spinand_manufacturer,
 	&macronix_spinand_manufacturer,
 	&micron_spinand_manufacturer,

include/linux/mtd/spinand.h

@@ -238,6 +238,7 @@ struct spinand_manufacturer {
 };
 
 /* SPI NAND manufacturers */
+extern const struct spinand_manufacturer biwin_spinand_manufacturer;
 extern const struct spinand_manufacturer gigadevice_spinand_manufacturer;
 extern const struct spinand_manufacturer macronix_spinand_manufacturer;
 extern const struct spinand_manufacturer micron_spinand_manufacturer;