nand: Support longsys nand flash

Summary:
    Support longsys nand flash(64MB).

Signed-off-by: yaqiang.li <[email protected]>

drivers/mtd/nand/spi/Makefile

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

drivers/mtd/nand/spi/core.c

@@ -759,6 +759,7 @@ static const struct nand_ops spinand_ops = {
 
 static const struct spinand_manufacturer *spinand_manufacturers[] = {
 	&gigadevice_spinand_manufacturer,
+	&longsys_spinand_manufacturer,
 	&macronix_spinand_manufacturer,
 #if IS_ENABLED(CONFIG_SPINAND_ESMT)
 	&esmt_spinand_manufacturer,
@@ -911,7 +912,7 @@ static int spinand_detect(struct spinand_device *spinand)
 
 	spinand->id.len = SPINAND_MAX_ID_LEN;
 
-	ret = spinand_manufacturer_detect(spinand);
+    ret = spinand_manufacturer_detect(spinand);
 	if (ret) {
 		dev_err(dev, "unknown raw ID %*phN\n", SPINAND_MAX_ID_LEN,
 			spinand->id.data);

drivers/mtd/nand/spi/longsys.c

@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Horizon Robotics, Inc.
+ * All rights reserved.
+ *
+ * Author:
+ *› Peng01 Liu<[email protected]>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mtd/spinand.h>
+
+#define SPINAND_MFR_LONGSYS		0xCD
+#define SPINAND_DID_LONGSYS		0x60
+
+static SPINAND_OP_VARIANTS(read_cache_variants,
+		SPINAND_PAGE_READ_FROM_CACHE_X4_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(true, 0, NULL, 0));
+
+static SPINAND_OP_VARIANTS(update_cache_variants,
+		SPINAND_PROG_LOAD(false, 0, NULL, 0));
+
+static int f35uqa512m_ooblayout_ecc(struct mtd_info *mtd, int section,
+					struct mtd_oob_region *region)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	/* ECC is not user accessible */
+	region->offset = 0;
+	region->length = 0;
+
+	return 0;
+}
+
+static int f35uqa512m_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *region)
+{
+	if (section > 3)
+		return -ERANGE;
+
+	/*
+	 * No ECC data is stored in the accessible OOB so the full 16 bytes
+	 * of each spare region is available to the user. Apparently also
+	 * covered by the internal ECC.
+	 */
+	if (section) {
+		region->offset = 16 * section;
+		region->length = 16;
+	} else {
+		/* First byte in spare0 area is used for bad block marker */
+		region->offset = 1;
+		region->length = 15;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops f35uqa512m_ooblayout = {
+	.ecc = f35uqa512m_ooblayout_ecc,
+	.free = f35uqa512m_ooblayout_free,
+};
+
+static const struct spinand_info longsys_spinand_table[] = {
+	SPINAND_INFO("F35UQA512M", 0xCD,
+		     NAND_MEMORG(1, 2048, 64, 64, 512, 20, 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(&f35uqa512m_ooblayout,
+				     NULL)),
+
+};
+
+static int longsysdevice_spinand_detect(struct spinand_device *spinand)
+{
+	u8 *id = spinand->id.data;
+	int ret, i = 0;
+
+	if (id[1] != SPINAND_MFR_LONGSYS)
+		return 0;
+
+	ret = spinand_match_and_init(spinand, longsys_spinand_table,
+				     ARRAY_SIZE(longsys_spinand_table),
+				     id[1]);
+	if (ret)
+		return ret;
+
+	return 1;
+}
+
+static const struct spinand_manufacturer_ops longsys_spinand_manuf_ops = {
+	.detect = longsysdevice_spinand_detect,
+};
+
+const struct spinand_manufacturer longsys_spinand_manufacturer = {
+	.id = SPINAND_MFR_LONGSYS,
+	.name = "Longsys",
+	.ops = &longsys_spinand_manuf_ops,
+};

include/linux/mtd/spinand.h

@@ -230,6 +230,7 @@ extern const struct spinand_manufacturer micron_spinand_manufacturer;
 extern const struct spinand_manufacturer winbond_spinand_manufacturer;
 extern const struct spinand_manufacturer esmt_spinand_manufacturer;
 extern const struct spinand_manufacturer xtx_spinand_manufacturer;
+extern const struct spinand_manufacturer longsys_spinand_manufacturer;
 
 /**
  * struct spinand_op_variants - SPI NAND operation variants