[U-Boot] [PATCH v4 17/27] mtd: spinand: Add initial support for the MX35LF1GE4AB chip

Miquel Raynal
2018-07-13T12:32:03Z

From: Boris Brezillon <boris.brezillon@bootlin.com>

Add minimal support for the MX35LF1GE4AB SPI NAND chip.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
---
drivers/mtd/nand/spi/Makefile | 2 +-
drivers/mtd/nand/spi/core.c | 1 +
drivers/mtd/nand/spi/macronix.c | 138 ++++++++++++++++++++++++++++++++++++++++
include/linux/mtd/spinand.h | 1 +
4 files changed, 141 insertions(+), 1 deletion(-)
create mode 100644 drivers/mtd/nand/spi/macronix.c

diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
index 11ba5de68b..a66edd9199 100644
--- a/drivers/mtd/nand/spi/Makefile
+++ b/drivers/mtd/nand/spi/Makefile
@@ -1,4 +1,4 @@
# SPDX-License-Identifier: GPL-2.0

-spinand-objs := core.o micron.o winbond.o
+spinand-objs := core.o macronix.o micron.o winbond.o
obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index ef3e6445d8..362d104846 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -830,6 +830,7 @@ static const struct nand_ops spinand_ops = {
};

static const struct spinand_manufacturer *spinand_manufacturers[] = {
+ &macronix_spinand_manufacturer,
&micron_spinand_manufacturer,
&winbond_spinand_manufacturer,
};
diff --git a/drivers/mtd/nand/spi/macronix.c b/drivers/mtd/nand/spi/macronix.c
new file mode 100644
index 0000000000..dd351dcb6c
--- /dev/null
+++ b/drivers/mtd/nand/spi/macronix.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 Macronix
+ *
+ * Author: Boris Brezillon <boris.brezillon@bootlin.com>
+ */
+
+#ifndef __UBOOT__
+#include <linux/device.h>
+#include <linux/kernel.h>
+#endif
+#include <linux/mtd/spinand.h>
+
+#define SPINAND_MFR_MACRONIX 0xC2
+
+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_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 mx35lf1ge4ab_ooblayout_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *region)
+{
+ return -ERANGE;
+}
+
+static int mx35lf1ge4ab_ooblayout_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *region)
+{
+ if (section)
+ return -ERANGE;
+
+ region->offset = 2;
+ region->length = mtd->oobsize - 2;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops mx35lf1ge4ab_ooblayout = {
+ .ecc = mx35lf1ge4ab_ooblayout_ecc,
+ .free = mx35lf1ge4ab_ooblayout_free,
+};
+
+static int mx35lf1ge4ab_get_eccsr(struct spinand_device *spinand, u8 *eccsr)
+{
+ struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0x7c, 1),
+ SPI_MEM_OP_NO_ADDR,
+ SPI_MEM_OP_DUMMY(1, 1),
+ SPI_MEM_OP_DATA_IN(1, eccsr, 1));
+
+ return spi_mem_exec_op(spinand->slave, &op);
+}
+
+static int mx35lf1ge4ab_ecc_get_status(struct spinand_device *spinand,
+ u8 status)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ u8 eccsr;
+
+ switch (status & STATUS_ECC_MASK) {
+ case STATUS_ECC_NO_BITFLIPS:
+ return 0;
+
+ case STATUS_ECC_UNCOR_ERROR:
+ return -EBADMSG;
+
+ case STATUS_ECC_HAS_BITFLIPS:
+ /*
+ * Let's try to retrieve the real maximum number of bitflips
+ * in order to avoid forcing the wear-leveling layer to move
+ * data around if it's not necessary.
+ */
+ if (mx35lf1ge4ab_get_eccsr(spinand, &eccsr))
+ return nand->eccreq.strength;
+
+ if (WARN_ON(eccsr > nand->eccreq.strength || !eccsr))
+ return nand->eccreq.strength;
+
+ return eccsr;
+
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static const struct spinand_info macronix_spinand_table[] = {
+ SPINAND_INFO("MX35LF1GE4AB", 0x12,
+ NAND_MEMORG(1, 2048, 64, 64, 1024, 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(&mx35lf1ge4ab_ooblayout,
+ mx35lf1ge4ab_ecc_get_status)),
+};
+
+static int macronix_spinand_detect(struct spinand_device *spinand)
+{
+ u8 *id = spinand->id.data;
+ int ret;
+
+ /*
+ * Macronix SPI NAND read ID needs a dummy byte, so the first byte in
+ * raw_id is garbage.
+ */
+ if (id[1] != SPINAND_MFR_MACRONIX)
+ return 0;
+
+ ret = spinand_match_and_init(spinand, macronix_spinand_table,
+ ARRAY_SIZE(macronix_spinand_table),
+ id[2]);
+ if (ret)
+ return ret;
+
+ return 1;
+}
+
+static const struct spinand_manufacturer_ops macronix_spinand_manuf_ops = {
+ .detect = macronix_spinand_detect,
+};
+
+const struct spinand_manufacturer macronix_spinand_manufacturer = {
+ .id = SPINAND_MFR_MACRONIX,
+ .name = "Macronix",
+ .ops = &macronix_spinand_manuf_ops,
+};
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index d40a7c8f4e..8c9c756179 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -201,6 +201,7 @@ struct spinand_manufacturer {
};

/* SPI NAND manufacturers */
+extern const struct spinand_manufacturer macronix_spinand_manufacturer;
extern const struct spinand_manufacturer micron_spinand_manufacturer;
extern const struct spinand_manufacturer winbond_spinand_manufacturer;

--
2.14.1