kernel: Add support for XTX XT26G02A SPI NAND

This chip is used on Teltonika RUTX boards.

Signed-off-by: Felix Matouschek <felix@matouschek.org>

2 files changed, 373 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.10/483-mtd-spinand-add-support-for-xtx-xt26g0xa.patch b/target/linux/generic/pending-5.10/483-mtd-spinand-add-support-for-xtx-xt26g0xa.patch
new file mode 100644
index 0000000000..11590770cd
--- /dev/null
+++ b/target/linux/generic/pending-5.10/483-mtd-spinand-add-support-for-xtx-xt26g0xa.patch
@@ -0,0 +1,178 @@
+From a07e31adf2753cad2fd9790db5bfc047c81e8152 Mon Sep 17 00:00:00 2001
+From: Felix Matouschek <felix@matouschek.org>
+Date: Fri, 2 Jul 2021 20:31:23 +0200
+Subject: [PATCH] mtd: spinand: Add support for XTX XT26G0xA
+
+Add support for XTX Technology XT26G01AXXXXX, XTX26G02AXXXXX and
+XTX26G04AXXXXX SPI NAND.
+
+These are 3V, 1G/2G/4Gbit serial SLC NAND flash devices with on-die ECC
+(8bit strength per 512bytes).
+
+Tested on Teltonika RUTX10 flashed with OpenWrt.
+
+Datasheets available at
+http://www.xtxtech.com/download/?AId=225
+https://datasheet.lcsc.com/szlcsc/2005251034_XTX-XT26G01AWSEGA_C558841.pdf
+
+Signed-off-by: Felix Matouschek <felix@matouschek.org>
+---
+ drivers/mtd/nand/spi/Makefile |   2 +-
+ drivers/mtd/nand/spi/core.c   |   1 +
+ drivers/mtd/nand/spi/xtx.c    | 122 ++++++++++++++++++++++++++++++++++
+ include/linux/mtd/spinand.h   |   1 +
+ 4 files changed, 125 insertions(+), 1 deletion(-)
+ create mode 100644 drivers/mtd/nand/spi/xtx.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 gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o xtx.o
+ obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
+--- a/drivers/mtd/nand/spi/core.c
++++ b/drivers/mtd/nand/spi/core.c
+@@ -760,6 +760,7 @@ static const struct spinand_manufacturer
+ 	&paragon_spinand_manufacturer,
+ 	&toshiba_spinand_manufacturer,
+ 	&winbond_spinand_manufacturer,
++	&xtx_spinand_manufacturer,
+ };
+ 
+ static int spinand_manufacturer_match(struct spinand_device *spinand,
+--- /dev/null
++++ b/drivers/mtd/nand/spi/xtx.c
+@@ -0,0 +1,122 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * Author:
++ * Felix Matouschek <felix@matouschek.org>
++ */
++
++#include <linux/device.h>
++#include <linux/kernel.h>
++#include <linux/mtd/spinand.h>
++
++#define SPINAND_MFR_XTX	0x0B
++
++#define XT26G0XA_STATUS_ECC_MASK	GENMASK(5, 2)
++#define XT26G0XA_STATUS_ECC_NO_DETECTED	(0 << 2)
++#define XT26G0XA_STATUS_ECC_8_CORRECTED	(3 << 4)
++#define XT26G0XA_STATUS_ECC_UNCOR_ERROR	(2 << 4)
++
++static SPINAND_OP_VARIANTS(read_cache_variants,
++		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, 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 xt26g0xa_ooblayout_ecc(struct mtd_info *mtd, int section,
++				   struct mtd_oob_region *region)
++{
++	if (section)
++		return -ERANGE;
++
++	region->offset = 8;
++	region->length = 40;
++
++	return 0;
++}
++
++static int xt26g0xa_ooblayout_free(struct mtd_info *mtd, int section,
++				   struct mtd_oob_region *region)
++{
++	if (section)
++		return -ERANGE;
++
++	region->offset = 1;
++	region->length = 7;
++
++	return 0;
++}
++
++static const struct mtd_ooblayout_ops xt26g0xa_ooblayout = {
++	.ecc = xt26g0xa_ooblayout_ecc,
++	.free = xt26g0xa_ooblayout_free,
++};
++
++static int xt26g0xa_ecc_get_status(struct spinand_device *spinand,
++					 u8 status)
++{
++	switch (status & XT26G0XA_STATUS_ECC_MASK) {
++	case XT26G0XA_STATUS_ECC_NO_DETECTED:
++		return 0;
++	case XT26G0XA_STATUS_ECC_8_CORRECTED:
++		return 8;
++	case XT26G0XA_STATUS_ECC_UNCOR_ERROR:
++		return -EBADMSG;
++	default: /* (1 << 2) through (7 << 2) are 1-7 corrected errors */
++		return (status & XT26G0XA_STATUS_ECC_MASK) >> 2;
++	}
++
++	return -EINVAL;
++}
++
++static const struct spinand_info xtx_spinand_table[] = {
++	SPINAND_INFO("XT26G01A",
++		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xE1),
++		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 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(&xt26g0xa_ooblayout,
++				     xt26g0xa_ecc_get_status)),
++	SPINAND_INFO("XT26G02A",
++		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xE2),
++		     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(&xt26g0xa_ooblayout,
++				     xt26g0xa_ecc_get_status)),
++	SPINAND_INFO("XT26G04A",
++		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xE3),
++		     NAND_MEMORG(1, 2048, 64, 128, 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(&xt26g0xa_ooblayout,
++				     xt26g0xa_ecc_get_status)),
++};
++
++static const struct spinand_manufacturer_ops xtx_spinand_manuf_ops = {
++};
++
++const struct spinand_manufacturer xtx_spinand_manufacturer = {
++	.id = SPINAND_MFR_XTX,
++	.name = "XTX",
++	.chips = xtx_spinand_table,
++	.nchips = ARRAY_SIZE(xtx_spinand_table),
++	.ops = &xtx_spinand_manuf_ops,
++};
+--- a/include/linux/mtd/spinand.h
++++ b/include/linux/mtd/spinand.h
+@@ -244,6 +244,7 @@ extern const struct spinand_manufacturer
+ extern const struct spinand_manufacturer paragon_spinand_manufacturer;
+ extern const struct spinand_manufacturer toshiba_spinand_manufacturer;
+ extern const struct spinand_manufacturer winbond_spinand_manufacturer;
++extern const struct spinand_manufacturer xtx_spinand_manufacturer;
+ 
+ /**
+  * struct spinand_op_variants - SPI NAND operation variants
diff --git a/target/linux/generic/pending-5.4/483-mtd-spinand-add-support-for-xtx-xt26g0xa.patch b/target/linux/generic/pending-5.4/483-mtd-spinand-add-support-for-xtx-xt26g0xa.patch
new file mode 100644
index 0000000000..56cfc93c46
--- /dev/null
+++ b/target/linux/generic/pending-5.4/483-mtd-spinand-add-support-for-xtx-xt26g0xa.patch
@@ -0,0 +1,195 @@
+From 8ffe91b6b429277bd7bd79267ba836edf951dce2 Mon Sep 17 00:00:00 2001
+From: Felix Matouschek <felix@matouschek.org>
+Date: Fri, 2 Jul 2021 20:31:23 +0200
+Subject: [PATCH] mtd: spinand: Add support for XTX XT26G0xA
+
+Add support for XTX Technology XT26G01AXXXXX, XTX26G02AXXXXX and
+XTX26G04AXXXXX SPI NAND.
+
+These are 3V, 1G/2G/4Gbit serial SLC NAND flash devices with on-die ECC
+(8bit strength per 512bytes).
+
+Tested on Teltonika RUTX10 flashed with OpenWrt.
+
+Datasheets available at
+http://www.xtxtech.com/download/?AId=225
+https://datasheet.lcsc.com/szlcsc/2005251034_XTX-XT26G01AWSEGA_C558841.pdf
+
+Signed-off-by: Felix Matouschek <felix@matouschek.org>
+---
+ drivers/mtd/nand/spi/Makefile |   2 +-
+ drivers/mtd/nand/spi/core.c   |   1 +
+ drivers/mtd/nand/spi/xtx.c    | 139 ++++++++++++++++++++++++++++++++++
+ include/linux/mtd/spinand.h   |   1 +
+ 4 files changed, 142 insertions(+), 1 deletion(-)
+ create mode 100644 drivers/mtd/nand/spi/xtx.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 gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o xtx.o
+ obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
+--- a/drivers/mtd/nand/spi/core.c
++++ b/drivers/mtd/nand/spi/core.c
+@@ -758,6 +758,7 @@ static const struct spinand_manufacturer
+ 	&paragon_spinand_manufacturer,
+ 	&toshiba_spinand_manufacturer,
+ 	&winbond_spinand_manufacturer,
++	&xtx_spinand_manufacturer,
+ };
+ 
+ static int spinand_manufacturer_detect(struct spinand_device *spinand)
+--- /dev/null
++++ b/drivers/mtd/nand/spi/xtx.c
+@@ -0,0 +1,139 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * Author:
++ * Felix Matouschek <felix@matouschek.org>
++ */
++
++#include <linux/device.h>
++#include <linux/kernel.h>
++#include <linux/mtd/spinand.h>
++
++#define SPINAND_MFR_XTX	0x0B
++
++#define XT26G0XA_STATUS_ECC_MASK	GENMASK(5, 2)
++#define XT26G0XA_STATUS_ECC_NO_DETECTED	(0 << 2)
++#define XT26G0XA_STATUS_ECC_8_CORRECTED	(3 << 4)
++#define XT26G0XA_STATUS_ECC_UNCOR_ERROR	(2 << 4)
++
++static SPINAND_OP_VARIANTS(read_cache_variants,
++		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, 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 xt26g0xa_ooblayout_ecc(struct mtd_info *mtd, int section,
++				   struct mtd_oob_region *region)
++{
++	if (section)
++		return -ERANGE;
++
++	region->offset = 8;
++	region->length = 40;
++
++	return 0;
++}
++
++static int xt26g0xa_ooblayout_free(struct mtd_info *mtd, int section,
++				   struct mtd_oob_region *region)
++{
++	if (section)
++		return -ERANGE;
++
++	region->offset = 1;
++	region->length = 7;
++
++	return 0;
++}
++
++static const struct mtd_ooblayout_ops xt26g0xa_ooblayout = {
++	.ecc = xt26g0xa_ooblayout_ecc,
++	.free = xt26g0xa_ooblayout_free,
++};
++
++static int xt26g0xa_ecc_get_status(struct spinand_device *spinand,
++					 u8 status)
++{
++	switch (status & XT26G0XA_STATUS_ECC_MASK) {
++	case XT26G0XA_STATUS_ECC_NO_DETECTED:
++		return 0;
++	case XT26G0XA_STATUS_ECC_8_CORRECTED:
++		return 8;
++	case XT26G0XA_STATUS_ECC_UNCOR_ERROR:
++		return -EBADMSG;
++	default: /* (1 << 2) through (7 << 2) are 1-7 corrected errors */
++		return (status & XT26G0XA_STATUS_ECC_MASK) >> 2;
++	}
++
++	return -EINVAL;
++}
++
++static const struct spinand_info xtx_spinand_table[] = {
++	SPINAND_INFO("XT26G01A", 0xE1,
++		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 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(&xt26g0xa_ooblayout,
++				     xt26g0xa_ecc_get_status)),
++	SPINAND_INFO("XT26G02A", 0xE2,
++		     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(&xt26g0xa_ooblayout,
++				     xt26g0xa_ecc_get_status)),
++	SPINAND_INFO("XT26G04A", 0xE3,
++		     NAND_MEMORG(1, 2048, 64, 128, 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(&xt26g0xa_ooblayout,
++				     xt26g0xa_ecc_get_status)),
++};
++
++static int xtx_spinand_detect(struct spinand_device *spinand)
++{
++	u8 *id = spinand->id.data;
++	int ret;
++
++	/*
++	 * XTX SPI NAND read ID needs a dummy byte, so the first byte in
++	 * raw_id is garbage.
++	 */
++	if (id[1] != SPINAND_MFR_XTX)
++		return 0;
++
++	ret = spinand_match_and_init(spinand, xtx_spinand_table,
++				     ARRAY_SIZE(xtx_spinand_table),
++				     id[2]);
++	if (ret)
++		return ret;
++
++	return 1;
++}
++
++static const struct spinand_manufacturer_ops xtx_spinand_manuf_ops = {
++	.detect = xtx_spinand_detect,
++};
++
++const struct spinand_manufacturer xtx_spinand_manufacturer = {
++	.id = SPINAND_MFR_XTX,
++	.name = "XTX",
++	.ops = &xtx_spinand_manuf_ops,
++};
+--- a/include/linux/mtd/spinand.h
++++ b/include/linux/mtd/spinand.h
+@@ -230,6 +230,7 @@ extern const struct spinand_manufacturer
+ extern const struct spinand_manufacturer paragon_spinand_manufacturer;
+ extern const struct spinand_manufacturer toshiba_spinand_manufacturer;
+ extern const struct spinand_manufacturer winbond_spinand_manufacturer;
++extern const struct spinand_manufacturer xtx_spinand_manufacturer;
+ 
+ /**
+  * struct spinand_op_variants - SPI NAND operation variants