mtd: spinand: Add initial support for Winbond W25M02GV

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>

diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
index a1df25398f20fb671d5cb3ff5d260a9b397341a4..100008d202ed313212e4e5886aae836db2d80fde 100644 (file)
--- 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 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 9cc502d7e745f4560fee13856b1295e7fb463303..4803a6bfe8ec405a1af6fc06f57df082763960f5 100644 (file)
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -765,6 +765,7 @@ 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 (file)
index 0000000..67baa1b
--- /dev/null
+++ b/drivers/mtd/nand/spi/winbond.c
@@ -0,0 +1,141 @@
+// 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>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#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->spimem, &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 717b272940f106e1e3e505cc81dad75f070ba037..f0f16b9029e703b07b4fbc18f05b842ec9949062 100644 (file)
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -195,6 +195,7 @@ 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