generic-4.19: Backport spi-nand support for GigaDevice A/E

This patch backports verbatim the commits from Linux 5.0 and 5.1
that implemented support for GigaDevice SPI NAND A and E variants.

Supported only in Linux 4.19 and later as based on the upstream
drivers/mtd/nand/spi/ framework.

mtd-spinand-add-support-for-GigaDevice-GD5FxGQ4xA.patch
commit c93c613214ac (5.0)

mtd-spinand-Add-support-for-GigaDevice-GD5F1GQ4UExxG.patch
commit c40c7a990a46 (5.1)

Run-tested-on: GL.iNet AR750S

Signed-off-by: Jeff Kletsky <git-commits@allycomm.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/target/linux/generic/backport-4.19/451-v5.1-mtd-spinand-Add-support-for-GigaDevice-GD5F1GQ4UExxG.patch b/target/linux/generic/backport-4.19/451-v5.1-mtd-spinand-Add-support-for-GigaDevice-GD5F1GQ4UExxG.patch
new file mode 100644
index 0000000000..f6d6764707
--- /dev/null
+++ b/target/linux/generic/backport-4.19/451-v5.1-mtd-spinand-Add-support-for-GigaDevice-GD5F1GQ4UExxG.patch
@@ -0,0 +1,129 @@
+From c40c7a990a46e5102a1cc4190557bf315d32d80d Mon Sep 17 00:00:00 2001
+From: Stefan Roese <sr@denx.de>
+Date: Thu, 24 Jan 2019 13:48:06 +0100
+Subject: [PATCH] mtd: spinand: Add support for GigaDevice GD5F1GQ4UExxG
+
+Add support for GigaDevice GD5F1GQ4UExxG SPI NAND chip.
+
+Signed-off-by: Stefan Roese <sr@denx.de>
+Cc: Chuanhong Guo <gch981213@gmail.com>
+Cc: Frieder Schrempf <frieder.schrempf@kontron.de>
+Cc: Miquel Raynal <miquel.raynal@bootlin.com>
+Cc: Boris Brezillon <bbrezillon@kernel.org>
+Reviewed-by: Boris Brezillon <bbrezillon@kernel.org>
+Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
+---
+ drivers/mtd/nand/spi/gigadevice.c | 83 +++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 83 insertions(+)
+
+--- a/drivers/mtd/nand/spi/gigadevice.c
++++ b/drivers/mtd/nand/spi/gigadevice.c
+@@ -12,6 +12,8 @@
+ #define GD5FXGQ4XA_STATUS_ECC_1_7_BITFLIPS	(1 << 4)
+ #define GD5FXGQ4XA_STATUS_ECC_8_BITFLIPS	(3 << 4)
+ 
++#define GD5FXGQ4UEXXG_REG_STATUS2		0xf0
++
+ 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),
+@@ -81,11 +83,83 @@ static int gd5fxgq4xa_ecc_get_status(str
+ 	return -EINVAL;
+ }
+ 
++static int gd5fxgq4uexxg_ooblayout_ecc(struct mtd_info *mtd, int section,
++				       struct mtd_oob_region *region)
++{
++	if (section)
++		return -ERANGE;
++
++	region->offset = 64;
++	region->length = 64;
++
++	return 0;
++}
++
++static int gd5fxgq4uexxg_ooblayout_free(struct mtd_info *mtd, int section,
++					struct mtd_oob_region *region)
++{
++	if (section)
++		return -ERANGE;
++
++	/* Reserve 1 bytes for the BBM. */
++	region->offset = 1;
++	region->length = 63;
++
++	return 0;
++}
++
++static int gd5fxgq4uexxg_ecc_get_status(struct spinand_device *spinand,
++					u8 status)
++{
++	u8 status2;
++	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(GD5FXGQ4UEXXG_REG_STATUS2,
++						      &status2);
++	int ret;
++
++	switch (status & STATUS_ECC_MASK) {
++	case STATUS_ECC_NO_BITFLIPS:
++		return 0;
++
++	case GD5FXGQ4XA_STATUS_ECC_1_7_BITFLIPS:
++		/*
++		 * Read status2 register to determine a more fine grained
++		 * bit error status
++		 */
++		ret = spi_mem_exec_op(spinand->spimem, &op);
++		if (ret)
++			return ret;
++
++		/*
++		 * 4 ... 7 bits are flipped (1..4 can't be detected, so
++		 * report the maximum of 4 in this case
++		 */
++		/* bits sorted this way (3...0): ECCS1,ECCS0,ECCSE1,ECCSE0 */
++		return ((status & STATUS_ECC_MASK) >> 2) |
++			((status2 & STATUS_ECC_MASK) >> 4);
++
++	case GD5FXGQ4XA_STATUS_ECC_8_BITFLIPS:
++		return 8;
++
++	case STATUS_ECC_UNCOR_ERROR:
++		return -EBADMSG;
++
++	default:
++		break;
++	}
++
++	return -EINVAL;
++}
++
+ static const struct mtd_ooblayout_ops gd5fxgq4xa_ooblayout = {
+ 	.ecc = gd5fxgq4xa_ooblayout_ecc,
+ 	.free = gd5fxgq4xa_ooblayout_free,
+ };
+ 
++static const struct mtd_ooblayout_ops gd5fxgq4uexxg_ooblayout = {
++	.ecc = gd5fxgq4uexxg_ooblayout_ecc,
++	.free = gd5fxgq4uexxg_ooblayout_free,
++};
++
+ static const struct spinand_info gigadevice_spinand_table[] = {
+ 	SPINAND_INFO("GD5F1GQ4xA", 0xF1,
+ 		     NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 1),
+@@ -114,6 +188,15 @@ static const struct spinand_info gigadev
+ 		     0,
+ 		     SPINAND_ECCINFO(&gd5fxgq4xa_ooblayout,
+ 				     gd5fxgq4xa_ecc_get_status)),
++	SPINAND_INFO("GD5F1GQ4UExxG", 0xd1,
++		     NAND_MEMORG(1, 2048, 128, 64, 1024, 1, 1, 1),
++		     NAND_ECCREQ(8, 512),
++		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
++					      &write_cache_variants,
++					      &update_cache_variants),
++		     0,
++		     SPINAND_ECCINFO(&gd5fxgq4uexxg_ooblayout,
++				     gd5fxgq4uexxg_ecc_get_status)),
+ };
+ 
+ static int gigadevice_spinand_detect(struct spinand_device *spinand)