From ea0df4552efcdcc2806fe6eba0540b5f719d80b6 Mon Sep 17 00:00:00 2001
From: Davide Fioravanti <pantanastyle@gmail.com>
Date: Fri, 8 Jan 2021 15:35:24 +0100
Subject: [PATCH 1/1] mtd: spinand: Add support for the Fidelix FM35X1GA

Datasheet: http://www.hobos.com.cn/upload/datasheet/DS35X1GAXXX_100_rev00.pdf

Signed-off-by: Davide Fioravanti <pantanastyle@gmail.com>
---
 drivers/mtd/nand/spi/Makefile  |  2 +-
 drivers/mtd/nand/spi/core.c    |  1 +
 drivers/mtd/nand/spi/fidelix.c | 80 ++++++++++++++++++++++++++++++++++
 include/linux/mtd/spinand.h    |  1 +
 4 files changed, 83 insertions(+), 1 deletion(-)
 create mode 100644 drivers/mtd/nand/spi/fidelix.c

--- a/drivers/mtd/nand/spi/Makefile
+++ b/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 := core.o fidelix.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o
 obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -755,6 +755,7 @@ static const struct nand_ops spinand_ops
 };
 
 static const struct spinand_manufacturer *spinand_manufacturers[] = {
+	&fidelix_spinand_manufacturer,
 	&gigadevice_spinand_manufacturer,
 	&macronix_spinand_manufacturer,
 	&micron_spinand_manufacturer,
--- /dev/null
+++ b/drivers/mtd/nand/spi/fidelix.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2020 Davide Fioravanti <pantanastyle@gmail.com>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mtd/spinand.h>
+
+#define SPINAND_MFR_FIDELIX		0xE5
+#define FIDELIX_ECCSR_MASK		0x0F
+
+static SPINAND_OP_VARIANTS(read_cache_variants,
+		SPINAND_PAGE_READ_FROM_CACHE_X4_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 fm35x1ga_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 fm35x1ga_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 fm35x1ga_ooblayout = {
+	.ecc = fm35x1ga_ooblayout_ecc,
+	.free = fm35x1ga_ooblayout_free,
+};
+
+static const struct spinand_info fidelix_spinand_table[] = {
+	SPINAND_INFO("FM35X1GA",
+		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x71),
+		     NAND_MEMORG(1, 2048, 64, 64, 1024, 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(&fm35x1ga_ooblayout, NULL)),
+};
+
+static const struct spinand_manufacturer_ops fidelix_spinand_manuf_ops = {
+};
+
+const struct spinand_manufacturer fidelix_spinand_manufacturer = {
+	.id = SPINAND_MFR_FIDELIX,
+	.name = "Fidelix",
+	.chips = fidelix_spinand_table,
+	.nchips = ARRAY_SIZE(fidelix_spinand_table),
+	.ops = &fidelix_spinand_manuf_ops,
+};
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -238,6 +238,7 @@ struct spinand_manufacturer {
 };
 
 /* SPI NAND manufacturers */
+extern const struct spinand_manufacturer fidelix_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;