[U-Boot] [PATCH v6 16/27] mtd: spinand: Add initial support for Winbond W25M02GV

Miquel Raynal
2018-08-01T08:18:37Z

From: Frieder Schrempf <frieder.schrempf@exceet.de>

Add support for the W25M02GV chip.

Signed-off-by: Frieder Schrempf <frieder.schrempf@exceet.de>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Jagan Teki <jagan@openedev.com>
---
drivers/mtd/nand/spi/Makefile | 2 +-
drivers/mtd/nand/spi/core.c | 1 +
drivers/mtd/nand/spi/winbond.c | 143 +++++++++++++++++++++++++++++++++++++++++
include/linux/mtd/spinand.h | 1 +
4 files changed, 146 insertions(+), 1 deletion(-)
create mode 100644 drivers/mtd/nand/spi/winbond.c

diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
index 4eb745abd4..11ba5de68b 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
+spinand-objs := core.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 36b8b52bc2..ef3e6445d8 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -831,6 +831,7 @@ static const struct nand_ops spinand_ops = {

static const struct spinand_manufacturer *spinand_manufacturers[] = {
&micron_spinand_manufacturer,
+ &winbond_spinand_manufacturer,
};

static int spinand_manufacturer_detect(struct spinand_device *spinand)
diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c
new file mode 100644
index 0000000000..eac811d97c
--- /dev/null
+++ b/drivers/mtd/nand/spi/winbond.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2017 exceet electronics GmbH
+ *
+ * Authors:
+ * Frieder Schrempf <frieder.schrempf@exceet.de>
+ * 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_WINBOND 0xEF
+
+#define WINBOND_CFG_BUF_READ BIT(3)
+
+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 w25m02gv_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 w25m02gv_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 w25m02gv_ooblayout = {
+ .ecc = w25m02gv_ooblayout_ecc,
+ .free = w25m02gv_ooblayout_free,
+};
+
+static int w25m02gv_select_target(struct spinand_device *spinand,
+ unsigned int target)
+{
+ struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0xc2, 1),
+ SPI_MEM_OP_NO_ADDR,
+ SPI_MEM_OP_NO_DUMMY,
+ SPI_MEM_OP_DATA_OUT(1,
+ spinand->scratchbuf,
+ 1));
+
+ *spinand->scratchbuf = target;
+ return spi_mem_exec_op(spinand->slave, &op);
+}
+
+static const struct spinand_info winbond_spinand_table[] = {
+ SPINAND_INFO("W25M02GV", 0xAB,
+ NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 2),
+ NAND_ECCREQ(1, 512),
+ SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+ &write_cache_variants,
+ &update_cache_variants),
+ 0,
+ SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL),
+ SPINAND_SELECT_TARGET(w25m02gv_select_target)),
+};
+
+/**
+ * winbond_spinand_detect - initialize device related part in spinand_device
+ * struct if it is a Winbond device.
+ * @spinand: SPI NAND device structure
+ */
+static int winbond_spinand_detect(struct spinand_device *spinand)
+{
+ u8 *id = spinand->id.data;
+ int ret;
+
+ /*
+ * Winbond SPI NAND read ID need a dummy byte,
+ * so the first byte in raw_id is dummy.
+ */
+ if (id[1] != SPINAND_MFR_WINBOND)
+ return 0;
+
+ ret = spinand_match_and_init(spinand, winbond_spinand_table,
+ ARRAY_SIZE(winbond_spinand_table), id[2]);
+ if (ret)
+ return ret;
+
+ return 1;
+}
+
+static int winbond_spinand_init(struct spinand_device *spinand)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ unsigned int i;
+
+ /*
+ * Make sure all dies are in buffer read mode and not continuous read
+ * mode.
+ */
+ for (i = 0; i < nand->memorg.ntargets; i++) {
+ spinand_select_target(spinand, i);
+ spinand_upd_cfg(spinand, WINBOND_CFG_BUF_READ,
+ WINBOND_CFG_BUF_READ);
+ }
+
+ return 0;
+}
+
+static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
+ .detect = winbond_spinand_detect,
+ .init = winbond_spinand_init,
+};
+
+const struct spinand_manufacturer winbond_spinand_manufacturer = {
+ .id = SPINAND_MFR_WINBOND,
+ .name = "Winbond",
+ .ops = &winbond_spinand_manuf_ops,
+};
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index 5302d38de8..d40a7c8f4e 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -202,6 +202,7 @@ struct spinand_manufacturer {

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

/**
* struct spinand_op_variants - SPI NAND operation variants
--
2.14.1