mtd: spinand: Add initial support for Micron MT29F2G01ABAGD

Add a basic driver for Micron SPI NANDs. Only one device is supported
right now, but the driver will be extended to support more devices
afterwards.

Signed-off-by: Peter Pan <peterpandong@micron.com>
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 2c473b7650279a31affb2490449864130238bcfc..a1df25398f20fb671d5cb3ff5d260a9b397341a4 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
+spinand-objs := core.o micron.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 4efbeb0d85b4b96e57a786aa64896a5083ea3eba..9cc502d7e745f4560fee13856b1295e7fb463303 100644 (file)
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -763,8 +763,25 @@ static const struct nand_ops spinand_ops = {
        .isbad = spinand_isbad,
 };
 
+static const struct spinand_manufacturer *spinand_manufacturers[] = {
+       &micron_spinand_manufacturer,
+};
+
 static int spinand_manufacturer_detect(struct spinand_device *spinand)
 {
+       unsigned int i;
+       int ret;
+
+       for (i = 0; i < ARRAY_SIZE(spinand_manufacturers); i++) {
+               ret = spinand_manufacturers[i]->ops->detect(spinand);
+               if (ret > 0) {
+                       spinand->manufacturer = spinand_manufacturers[i];
+                       return 0;
+               } else if (ret < 0) {
+                       return ret;
+               }
+       }
+
        return -ENOTSUPP;
 }
 

diff --git a/drivers/mtd/nand/spi/micron.c b/drivers/mtd/nand/spi/micron.c
new file mode 100644 (file)
index 0000000..9c4381d
--- /dev/null
+++ b/drivers/mtd/nand/spi/micron.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2016-2017 Micron Technology, Inc.
+ *
+ * Authors:
+ *     Peter Pan <peterpandong@micron.com>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mtd/spinand.h>
+
+#define SPINAND_MFR_MICRON             0x2c
+
+#define MICRON_STATUS_ECC_MASK         GENMASK(7, 4)
+#define MICRON_STATUS_ECC_NO_BITFLIPS  (0 << 4)
+#define MICRON_STATUS_ECC_1TO3_BITFLIPS        (1 << 4)
+#define MICRON_STATUS_ECC_4TO6_BITFLIPS        (3 << 4)
+#define MICRON_STATUS_ECC_7TO8_BITFLIPS        (5 << 4)
+
+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 mt29f2g01abagd_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 mt29f2g01abagd_ooblayout_free(struct mtd_info *mtd, int section,
+                                        struct mtd_oob_region *region)
+{
+       if (section)
+               return -ERANGE;
+
+       /* Reserve 2 bytes for the BBM. */
+       region->offset = 2;
+       region->length = 62;
+
+       return 0;
+}
+
+static const struct mtd_ooblayout_ops mt29f2g01abagd_ooblayout = {
+       .ecc = mt29f2g01abagd_ooblayout_ecc,
+       .free = mt29f2g01abagd_ooblayout_free,
+};
+
+static int mt29f2g01abagd_ecc_get_status(struct spinand_device *spinand,
+                                        u8 status)
+{
+       switch (status & MICRON_STATUS_ECC_MASK) {
+       case STATUS_ECC_NO_BITFLIPS:
+               return 0;
+
+       case STATUS_ECC_UNCOR_ERROR:
+               return -EBADMSG;
+
+       case MICRON_STATUS_ECC_1TO3_BITFLIPS:
+               return 3;
+
+       case MICRON_STATUS_ECC_4TO6_BITFLIPS:
+               return 6;
+
+       case MICRON_STATUS_ECC_7TO8_BITFLIPS:
+               return 8;
+
+       default:
+               break;
+       }
+
+       return -EINVAL;
+}
+
+static const struct spinand_info micron_spinand_table[] = {
+       SPINAND_INFO("MT29F2G01ABAGD", 0x24,
+                    NAND_MEMORG(1, 2048, 128, 64, 2048, 2, 1, 1),
+                    NAND_ECCREQ(8, 512),
+                    SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+                                             &write_cache_variants,
+                                             &update_cache_variants),
+                    0,
+                    SPINAND_ECCINFO(&mt29f2g01abagd_ooblayout,
+                                    mt29f2g01abagd_ecc_get_status)),
+};
+
+static int micron_spinand_detect(struct spinand_device *spinand)
+{
+       u8 *id = spinand->id.data;
+       int ret;
+
+       /*
+        * Micron SPI NAND read ID need a dummy byte,
+        * so the first byte in raw_id is dummy.
+        */
+       if (id[1] != SPINAND_MFR_MICRON)
+               return 0;
+
+       ret = spinand_match_and_init(spinand, micron_spinand_table,
+                                    ARRAY_SIZE(micron_spinand_table), id[2]);
+       if (ret)
+               return ret;
+
+       return 1;
+}
+
+static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
+       .detect = micron_spinand_detect,
+};
+
+const struct spinand_manufacturer micron_spinand_manufacturer = {
+       .id = SPINAND_MFR_MICRON,
+       .name = "Micron",
+       .ops = &micron_spinand_manuf_ops,
+};

diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index d3efe62dc9de8ec90518b32310545b6f0ebc61ef..717b272940f106e1e3e505cc81dad75f070ba037 100644 (file)
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -193,6 +193,9 @@ struct spinand_manufacturer {
        const struct spinand_manufacturer_ops *ops;
 };
 
+/* SPI NAND manufacturers */
+extern const struct spinand_manufacturer micron_spinand_manufacturer;
+
 /**
  * struct spinand_op_variants - SPI NAND operation variants
  * @ops: the list of variants for a given operation