mtd: spinand: Support unim

TX25G01

Change-Id: Ifebf63cc803870602c627c741d1cd51c65977b6b
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 := biwin.o core.o dosilicon.o esmt.o etron.o fmsh.o foresee.o gigadevice.o hyf.o jsc.o macronix.o micron.o paragon.o silicongo.o toshiba.o winbond.o
+spinand-objs := biwin.o core.o dosilicon.o esmt.o etron.o fmsh.o foresee.o gigadevice.o hyf.o jsc.o macronix.o micron.o paragon.o silicongo.o toshiba.o unim.o winbond.o
 obj-$(CONFIG_MTD_SPI_NAND) += spinand.o

drivers/mtd/nand/spi/core.c

@@ -863,6 +863,7 @@ static const struct spinand_manufacturer *spinand_manufacturers[] = {
 	&paragon_spinand_manufacturer,
 	&silicongo_spinand_manufacturer,
 	&toshiba_spinand_manufacturer,
+	&unim_spinand_manufacturer,
 	&winbond_spinand_manufacturer,
 };
 

drivers/mtd/nand/spi/unim.c

@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 Rockchip Electronics Co., Ltd
+ *
+ * Authors:
+ *	Dingqiang Lin <jon.lin@rock-chips.com>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mtd/spinand.h>
+
+#define SPINAND_MFR_UNIM		0xA1
+
+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 tx25g01_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 tx25g01_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 tx25g01_ooblayout = {
+	.ecc = tx25g01_ooblayout_ecc,
+	.free = tx25g01_ooblayout_free,
+};
+
+/*
+ * ecc bits: 0xC0[4,6]
+ * [0b000], No bit errors were detected;
+ * [0b001, 0b011], 1~3 Bit errors were detected and corrected. Not
+ *	reach Flipping Bits;
+ * [0b100], Bit error count equals the bit flip
+ *	detection threshold
+ * others, Reserved.
+ */
+static int tx25g01_ecc_get_status(struct spinand_device *spinand,
+				  u8 status)
+{
+	u8 eccsr = (status & GENMASK(6, 4)) >> 2;
+
+	if (eccsr <= 7)
+		return eccsr;
+	else if (eccsr == 12)
+		return 8;
+	else
+		return -EBADMSG;
+}
+
+static const struct spinand_info unim_spinand_table[] = {
+	SPINAND_INFO("TX25G01",
+		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xF1),
+		     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(&tx25g01_ooblayout, tx25g01_ecc_get_status)),
+};
+
+static const struct spinand_manufacturer_ops unim_spinand_manuf_ops = {
+};
+
+const struct spinand_manufacturer unim_spinand_manufacturer = {
+	.id = SPINAND_MFR_UNIM,
+	.name = "UNIM",
+	.chips = unim_spinand_table,
+	.nchips = ARRAY_SIZE(unim_spinand_table),
+	.ops = &unim_spinand_manuf_ops,
+};

include/linux/mtd/spinand.h

@@ -252,6 +252,7 @@ extern const struct spinand_manufacturer micron_spinand_manufacturer;
 extern const struct spinand_manufacturer paragon_spinand_manufacturer;
 extern const struct spinand_manufacturer toshiba_spinand_manufacturer;
 extern const struct spinand_manufacturer silicongo_spinand_manufacturer;
+extern const struct spinand_manufacturer unim_spinand_manufacturer;
 extern const struct spinand_manufacturer winbond_spinand_manufacturer;
 
 /**