mtd: spinand: Support dosilicon devcies

Support DS35X1GA

Change-Id: Iadbda15075e54325bf5c2dffa28d560947cec627
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

drivers/mtd/nand/spi/Makefile

@@ -1,4 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
 
-spinand-objs := core.o gigadevice.o macronix.o micron.o toshiba.o winbond.o
+spinand-objs := core.o gigadevice.o macronix.o micron.o toshiba.o winbond.o dosilicon.o
 obj-$(CONFIG_MTD_SPI_NAND) += spinand.o

drivers/mtd/nand/spi/core.c

@@ -824,6 +824,7 @@ static const struct spinand_manufacturer *spinand_manufacturers[] = {
 	&micron_spinand_manufacturer,
 	&toshiba_spinand_manufacturer,
 	&winbond_spinand_manufacturer,
+	&dosilicon_spinand_manufacturer,
 };
 
 static int spinand_manufacturer_detect(struct spinand_device *spinand)

drivers/mtd/nand/spi/dosilicon.c

@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2020 Rockchip Electronics Co., Ltd
+ *
+ * Authors:
+ *	Dingqiang Lin <jon.lin@rock-chips.com>
+ */
+
+#ifndef __UBOOT__
+#include <linux/device.h>
+#include <linux/kernel.h>
+#endif
+#include <linux/mtd/spinand.h>
+
+#define SPINAND_MFR_DOSILICON		0xE5
+
+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 ds35xxga_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 ds35xxga_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 ds35xxga_ooblayout = {
+	.ecc = ds35xxga_ooblayout_ecc,
+	.rfree = ds35xxga_ooblayout_free,
+};
+
+static const struct spinand_info dosilicon_spinand_table[] = {
+	SPINAND_INFO("DS35X1GA", 0x71,
+		     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(&ds35xxga_ooblayout, NULL)),
+};
+
+/**
+ * dosilicon_spinand_detect - initialize device related part in spinand_device
+ * struct if it is a dosilicon device.
+ * @spinand: SPI NAND device structure
+ */
+static int dosilicon_spinand_detect(struct spinand_device *spinand)
+{
+	u8 *id = spinand->id.data;
+	int ret;
+
+	/*
+	 * dosilicon SPI NAND read ID need a dummy byte,
+	 * so the first byte in raw_id is dummy.
+	 */
+	if (id[1] != SPINAND_MFR_DOSILICON)
+		return 0;
+
+	ret = spinand_match_and_init(spinand, dosilicon_spinand_table,
+				     ARRAY_SIZE(dosilicon_spinand_table), id[2]);
+	if (ret)
+		return ret;
+
+	return 1;
+}
+
+static int dosilicon_spinand_init(struct spinand_device *spinand)
+{
+	return 0;
+}
+
+static const struct spinand_manufacturer_ops dosilicon_spinand_manuf_ops = {
+	.detect = dosilicon_spinand_detect,
+	.init = dosilicon_spinand_init,
+};
+
+const struct spinand_manufacturer dosilicon_spinand_manufacturer = {
+	.id = SPINAND_MFR_DOSILICON,
+	.name = "dosilicon",
+	.ops = &dosilicon_spinand_manuf_ops,
+};

include/linux/mtd/spinand.h

@@ -206,6 +206,7 @@ extern const struct spinand_manufacturer macronix_spinand_manufacturer;
 extern const struct spinand_manufacturer micron_spinand_manufacturer;
 extern const struct spinand_manufacturer toshiba_spinand_manufacturer;
 extern const struct spinand_manufacturer winbond_spinand_manufacturer;
+extern const struct spinand_manufacturer dosilicon_spinand_manufacturer;
 
 /**
  * struct spinand_op_variants - SPI NAND operation variants