mtd: spi-nand: Import Toshiba SPI-NAND support

Linux has good support for Toshiba SPI-NAND, so lets import it.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Tested-by: Luka Kovacic <luka.kovacic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>

diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
index dd6baca..6c65b18 100644 (file)
--- 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 gigadevice.o macronix.o micron.o winbond.o
+spinand-objs := core.o gigadevice.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 cd624ec..397dfa4 100644 (file)
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -835,6 +835,7 @@ static const struct spinand_manufacturer *spinand_manufacturers[] = {
        &gigadevice_spinand_manufacturer,
        &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..571104a
--- /dev/null
+++ b/drivers/mtd/nand/spi/toshiba.c
@@ -0,0 +1,191 @@
+// 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>
+ */
+
+#ifndef __UBOOT__
+#include <malloc.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#endif
+#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 tc58cxgxsx_ooblayout_ecc(struct mtd_info *mtd, int section,
+                                    struct mtd_oob_region *region)
+{
+       if (section > 0)
+               return -ERANGE;
+
+       region->offset = mtd->oobsize / 2;
+       region->length = mtd->oobsize / 2;
+
+       return 0;
+}
+
+static int tc58cxgxsx_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 = (mtd->oobsize / 2) - 2;
+
+       return 0;
+}
+
+static const struct mtd_ooblayout_ops tc58cxgxsx_ooblayout = {
+       .ecc = tc58cxgxsx_ooblayout_ecc,
+       .rfree = tc58cxgxsx_ooblayout_free,
+};
+
+static int tc58cxgxsx_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->slave, &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[] = {
+       /* 3.3V 1Gb */
+       SPINAND_INFO("TC58CVG0S3", 0xC2,
+                    NAND_MEMORG(1, 2048, 128, 64, 1024, 1, 1, 1),
+                    NAND_ECCREQ(8, 512),
+                    SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+                                             &write_cache_variants,
+                                             &update_cache_variants),
+                    0,
+                    SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
+                                    tc58cxgxsx_ecc_get_status)),
+       /* 3.3V 2Gb */
+       SPINAND_INFO("TC58CVG1S3", 0xCB,
+                    NAND_MEMORG(1, 2048, 128, 64, 2048, 1, 1, 1),
+                    NAND_ECCREQ(8, 512),
+                    SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+                                             &write_cache_variants,
+                                             &update_cache_variants),
+                    0,
+                    SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
+                                    tc58cxgxsx_ecc_get_status)),
+       /* 3.3V 4Gb */
+       SPINAND_INFO("TC58CVG2S0", 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),
+                    0,
+                    SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
+                                    tc58cxgxsx_ecc_get_status)),
+       /* 1.8V 1Gb */
+       SPINAND_INFO("TC58CYG0S3", 0xB2,
+                    NAND_MEMORG(1, 2048, 128, 64, 1024, 1, 1, 1),
+                    NAND_ECCREQ(8, 512),
+                    SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+                                             &write_cache_variants,
+                                             &update_cache_variants),
+                    0,
+                    SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
+                                    tc58cxgxsx_ecc_get_status)),
+       /* 1.8V 2Gb */
+       SPINAND_INFO("TC58CYG1S3", 0xBB,
+                    NAND_MEMORG(1, 2048, 128, 64, 2048, 1, 1, 1),
+                    NAND_ECCREQ(8, 512),
+                    SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+                                             &write_cache_variants,
+                                             &update_cache_variants),
+                    0,
+                    SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
+                                    tc58cxgxsx_ecc_get_status)),
+       /* 1.8V 4Gb */
+       SPINAND_INFO("TC58CYG2S0", 0xBD,
+                    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),
+                    0,
+                    SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
+                                    tc58cxgxsx_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 be01e1e..83eafb1 100644 (file)
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -204,6 +204,7 @@ struct spinand_manufacturer {
 extern const struct spinand_manufacturer gigadevice_spinand_manufacturer;
 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;
 
 /**