mtd: spinand: Add initial support for Toshiba TC58CVG2S0H

Add minimal support for the Toshiba TC58CVG2S0H SPI NAND chip.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Acked-by: Clément Péron <peron.clem@gmail.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 b74e074b363a27ff92ca5a7a3b079e109e2926ac..be5f73512ece91322768fa87cae8d8b4bfd19c35 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 macronix.o micron.o winbond.o
+spinand-objs := core.o macronix.o micron.o toshiba.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 30f83649c48140e63d7f8871851a7f4ee3320ab6..87bdf2a7b7242775080ab1ae72814024306e6b89 100644 (file)
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -766,6 +766,7 @@ static const struct nand_ops spinand_ops = {
 static const struct spinand_manufacturer *spinand_manufacturers[] = {
        &macronix_spinand_manufacturer,
        &micron_spinand_manufacturer,
+       &toshiba_spinand_manufacturer,
        &winbond_spinand_manufacturer,
 };
 

diff --git a/drivers/mtd/nand/spi/toshiba.c b/drivers/mtd/nand/spi/toshiba.c
new file mode 100644 (file)
index 0000000..0812655
--- /dev/null
+++ b/drivers/mtd/nand/spi/toshiba.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 exceet electronics GmbH
+ * Copyright (c) 2018 Kontron Electronics GmbH
+ *
+ * Author: Frieder Schrempf <frieder.schrempf@kontron.de>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mtd/spinand.h>
+
+#define SPINAND_MFR_TOSHIBA            0x98
+#define TOSH_STATUS_ECC_HAS_BITFLIPS_T (3 << 4)
+
+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(true, 0, NULL, 0));
+
+static SPINAND_OP_VARIANTS(update_cache_variants,
+               SPINAND_PROG_LOAD(false, 0, NULL, 0));
+
+static int tc58cvg2s0h_ooblayout_ecc(struct mtd_info *mtd, int section,
+                                    struct mtd_oob_region *region)
+{
+       if (section > 7)
+               return -ERANGE;
+
+       region->offset = 128 + 16 * section;
+       region->length = 16;
+
+       return 0;
+}
+
+static int tc58cvg2s0h_ooblayout_free(struct mtd_info *mtd, int section,
+                                     struct mtd_oob_region *region)
+{
+       if (section > 0)
+               return -ERANGE;
+
+       /* 2 bytes reserved for BBM */
+       region->offset = 2;
+       region->length = 126;
+
+       return 0;
+}
+
+static const struct mtd_ooblayout_ops tc58cvg2s0h_ooblayout = {
+       .ecc = tc58cvg2s0h_ooblayout_ecc,
+       .free = tc58cvg2s0h_ooblayout_free,
+};
+
+static int tc58cvg2s0h_ecc_get_status(struct spinand_device *spinand,
+                                     u8 status)
+{
+       struct nand_device *nand = spinand_to_nand(spinand);
+       u8 mbf = 0;
+       struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &mbf);
+
+       switch (status & STATUS_ECC_MASK) {
+       case STATUS_ECC_NO_BITFLIPS:
+               return 0;
+
+       case STATUS_ECC_UNCOR_ERROR:
+               return -EBADMSG;
+
+       case STATUS_ECC_HAS_BITFLIPS:
+       case TOSH_STATUS_ECC_HAS_BITFLIPS_T:
+               /*
+                * 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 (spi_mem_exec_op(spinand->spimem, &op))
+                       return nand->eccreq.strength;
+
+               mbf >>= 4;
+
+               if (WARN_ON(mbf > nand->eccreq.strength || !mbf))
+                       return nand->eccreq.strength;
+
+               return mbf;
+
+       default:
+               break;
+       }
+
+       return -EINVAL;
+}
+
+static const struct spinand_info toshiba_spinand_table[] = {
+       SPINAND_INFO("TC58CVG2S0H", 0xCD,
+                    NAND_MEMORG(1, 4096, 256, 64, 2048, 1, 1, 1),
+                    NAND_ECCREQ(8, 512),
+                    SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+                                             &write_cache_variants,
+                                             &update_cache_variants),
+                    SPINAND_HAS_QE_BIT,
+                    SPINAND_ECCINFO(&tc58cvg2s0h_ooblayout,
+                                    tc58cvg2s0h_ecc_get_status)),
+};
+
+static int toshiba_spinand_detect(struct spinand_device *spinand)
+{
+       u8 *id = spinand->id.data;
+       int ret;
+
+       /*
+        * Toshiba SPI NAND read ID needs a dummy byte,
+        * so the first byte in id is garbage.
+        */
+       if (id[1] != SPINAND_MFR_TOSHIBA)
+               return 0;
+
+       ret = spinand_match_and_init(spinand, toshiba_spinand_table,
+                                    ARRAY_SIZE(toshiba_spinand_table),
+                                    id[2]);
+       if (ret)
+               return ret;
+
+       return 1;
+}
+
+static const struct spinand_manufacturer_ops toshiba_spinand_manuf_ops = {
+       .detect = toshiba_spinand_detect,
+};
+
+const struct spinand_manufacturer toshiba_spinand_manufacturer = {
+       .id = SPINAND_MFR_TOSHIBA,
+       .name = "Toshiba",
+       .ops = &toshiba_spinand_manuf_ops,
+};

diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index 088ff96c3eb6d4964df57fad76cc4f7a76089267..816c4b00abcaeb34c744f619d3eb06405e82a124 100644 (file)
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -196,6 +196,7 @@ 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 toshiba_spinand_manufacturer;
 extern const struct spinand_manufacturer winbond_spinand_manufacturer;
 
 /**