[PATCH v5 1/6] nand: spi: add basic blocks for infrastructure
Peter Pan
peterpandong at micron.com
Mon Apr 10 00:51:48 PDT 2017
This is the first commit for spi nand framkework.
This commit is to add add basic building blocks
for the SPI NAND infrastructure.
Signed-off-by: Peter Pan <peterpandong at micron.com>
---
drivers/mtd/nand/Kconfig | 1 +
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/spi/Kconfig | 5 +
drivers/mtd/nand/spi/Makefile | 1 +
drivers/mtd/nand/spi/core.c | 455 ++++++++++++++++++++++++++++++++++++++++++
include/linux/mtd/spinand.h | 257 ++++++++++++++++++++++++
6 files changed, 720 insertions(+)
create mode 100644 drivers/mtd/nand/spi/Kconfig
create mode 100644 drivers/mtd/nand/spi/Makefile
create mode 100644 drivers/mtd/nand/spi/core.c
create mode 100644 include/linux/mtd/spinand.h
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 1c1a1f4..7695fd8 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -2,3 +2,4 @@ config MTD_NAND_CORE
tristate
source "drivers/mtd/nand/raw/Kconfig"
+source "drivers/mtd/nand/spi/Kconfig"
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index fe430d9..6221958 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_MTD_NAND_CORE) += nandcore.o
nandcore-objs := bbt.o
obj-y += raw/
+obj-$(CONFIG_MTD_SPI_NAND) += spi/
diff --git a/drivers/mtd/nand/spi/Kconfig b/drivers/mtd/nand/spi/Kconfig
new file mode 100644
index 0000000..d77c46e
--- /dev/null
+++ b/drivers/mtd/nand/spi/Kconfig
@@ -0,0 +1,5 @@
+menuconfig MTD_SPI_NAND
+ tristate "SPI NAND device Support"
+ depends on MTD_NAND
+ help
+ This is the framework for the SPI NAND device drivers.
diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
new file mode 100644
index 0000000..a677a4d
--- /dev/null
+++ b/drivers/mtd/nand/spi/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_MTD_SPI_NAND) += core.o
diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
new file mode 100644
index 0000000..510c7cb
--- /dev/null
+++ b/drivers/mtd/nand/spi/core.c
@@ -0,0 +1,455 @@
+/*
+ *
+ * Copyright (c) 2009-2017 Micron Technology, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/mtd/spinand.h>
+#include <linux/slab.h>
+
+/*
+ * spinand_exec_op - execute SPI NAND operation by controller ->exec_op() hook
+ * @chip: SPI NAND device structure
+ * @op: pointer to spinand_op struct
+ */
+static inline int spinand_exec_op(struct spinand_device *chip,
+ struct spinand_op *op)
+{
+ return chip->controller.controller->ops->exec_op(chip, op);
+}
+
+/*
+ * spinand_init_op - initialize spinand_op struct
+ * @op: pointer to spinand_op struct
+ */
+static inline void spinand_init_op(struct spinand_op *op)
+{
+ memset(op, 0, sizeof(struct spinand_op));
+ op->addr_nbits = 1;
+ op->data_nbits = 1;
+}
+
+/*
+ * spinand_read_reg - read SPI NAND register
+ * @chip: SPI NAND device structure
+ * @reg; register to read
+ * @buf: buffer to store value
+ */
+static int spinand_read_reg(struct spinand_device *chip, u8 reg, u8 *buf)
+{
+ struct spinand_op op;
+ int ret;
+
+ spinand_init_op(&op);
+ op.cmd = SPINAND_CMD_GET_FEATURE;
+ op.n_addr = 1;
+ op.addr[0] = reg;
+ op.n_rx = 1;
+ op.rx_buf = buf;
+
+ ret = spinand_exec_op(chip, &op);
+ if (ret < 0)
+ dev_err(chip->dev, "err: %d read register %d\n", ret, reg);
+
+ return ret;
+}
+
+/*
+ * spinand_write_reg - write SPI NAND register
+ * @chip: SPI NAND device structure
+ * @reg; register to write
+ * @value: value to write
+ */
+static int spinand_write_reg(struct spinand_device *chip, u8 reg, u8 value)
+{
+ struct spinand_op op;
+ int ret;
+
+ spinand_init_op(&op);
+ op.cmd = SPINAND_CMD_SET_FEATURE;
+ op.n_addr = 1;
+ op.addr[0] = reg;
+ op.n_tx = 1;
+ op.tx_buf = &value;
+
+ ret = spinand_exec_op(chip, &op);
+ if (ret < 0)
+ dev_err(chip->dev, "err: %d write register %d\n", ret, reg);
+
+ return ret;
+}
+
+/*
+ * spinand_read_status - get status register value
+ * @chip: SPI NAND device structure
+ * @status: buffer to store value
+ * Description:
+ * After read, write, or erase, the NAND device is expected to set the
+ * busy status.
+ * This function is to allow reading the status of the command: read,
+ * write, and erase.
+ */
+static int spinand_read_status(struct spinand_device *chip, u8 *status)
+{
+ return spinand_read_reg(chip, REG_STATUS, status);
+}
+
+/*
+ * spinand_wait - wait until the command is done
+ * @chip: SPI NAND device structure
+ * @s: buffer to store status register value (can be NULL)
+ */
+static int spinand_wait(struct spinand_device *chip, u8 *s)
+{
+ unsigned long timeo = jiffies + msecs_to_jiffies(400);
+ u8 status;
+
+ do {
+ spinand_read_status(chip, &status);
+ if ((status & STATUS_OIP_MASK) == STATUS_READY)
+ goto out;
+ } while (time_before(jiffies, timeo));
+
+ /*
+ * Extra read, just in case the STATUS_READY bit has changed
+ * since our last check
+ */
+ spinand_read_status(chip, &status);
+out:
+ if (s)
+ *s = status;
+
+ return (status & STATUS_OIP_MASK) == STATUS_READY ? 0 : -ETIMEDOUT;
+}
+
+/*
+ * spinand_read_id - read SPI NAND ID
+ * @chip: SPI NAND device structure
+ * @buf: buffer to store id
+ * Description:
+ * Manufacturers' read ID method is not unique. Some need a dummy before
+ * reading, some's ID has three byte.
+ * This function send one byte opcode (9Fh) and then read
+ * SPINAND_MAX_ID_LEN (4 currently) bytes. Manufacturer's detect function
+ * need to filter out real ID from the 4 bytes.
+ */
+static int spinand_read_id(struct spinand_device *chip, u8 *buf)
+{
+ struct spinand_op op;
+
+ spinand_init_op(&op);
+ op.cmd = SPINAND_CMD_READ_ID;
+ op.n_rx = SPINAND_MAX_ID_LEN;
+ op.rx_buf = buf;
+
+ return spinand_exec_op(chip, &op);
+}
+
+/*
+ * spinand_reset - reset SPI NAND device
+ * @chip: SPI NAND device structure
+ */
+static int spinand_reset(struct spinand_device *chip)
+{
+ struct spinand_op op;
+ int ret;
+
+ spinand_init_op(&op);
+ op.cmd = SPINAND_CMD_RESET;
+
+ ret = spinand_exec_op(chip, &op);
+ if (ret < 0) {
+ dev_err(chip->dev, "reset failed!\n");
+ goto out;
+ }
+ ret = spinand_wait(chip, NULL);
+
+out:
+ return ret;
+}
+
+/*
+ * spinand_lock_block - write block lock register to lock/unlock device
+ * @chip: SPI NAND device structure
+ * @lock: value to set to block lock register
+ */
+static int spinand_lock_block(struct spinand_device *chip, u8 lock)
+{
+ return spinand_write_reg(chip, REG_BLOCK_LOCK, lock);
+}
+
+/*
+ * spinand_set_rd_wr_op - choose the best read write command
+ * @chip: SPI NAND device structure
+ * Description:
+ * Chose the fastest r/w command according to spi controller's and
+ * device's ability.
+ */
+static void spinand_set_rd_wr_op(struct spinand_device *chip)
+{
+ u32 controller_cap = chip->controller.controller->caps;
+ u32 rw_mode = chip->rw_mode;
+
+ if ((controller_cap & SPINAND_CAP_RD_QUAD) &&
+ (rw_mode & SPINAND_RD_QUAD))
+ chip->read_cache_op = SPINAND_CMD_READ_FROM_CACHE_QUAD_IO;
+ else if ((controller_cap & SPINAND_CAP_RD_X4) &&
+ (rw_mode & SPINAND_RD_X4))
+ chip->read_cache_op = SPINAND_CMD_READ_FROM_CACHE_X4;
+ else if ((controller_cap & SPINAND_CAP_RD_DUAL) &&
+ (rw_mode & SPINAND_RD_DUAL))
+ chip->read_cache_op = SPINAND_CMD_READ_FROM_CACHE_DUAL_IO;
+ else if ((controller_cap & SPINAND_CAP_RD_X2) &&
+ (rw_mode & SPINAND_RD_X2))
+ chip->read_cache_op = SPINAND_CMD_READ_FROM_CACHE_X2;
+ else
+ chip->read_cache_op = SPINAND_CMD_READ_FROM_CACHE_FAST;
+
+ if ((controller_cap & SPINAND_CAP_WR_X4) &&
+ (rw_mode & SPINAND_WR_X4))
+ chip->write_cache_op = SPINAND_CMD_PROG_LOAD_X4;
+ else
+ chip->write_cache_op = SPINAND_CMD_PROG_LOAD;
+}
+
+static const struct spinand_manufacturer *spinand_manufacturers[] = {};
+
+/*
+ * spinand_manufacturer_detect - detect SPI NAND device by each manufacturer
+ * @chip: SPI NAND device structure
+ *
+ * ->detect() should decode raw id in chip->id.data and initialize device
+ * related part in spinand_device structure if it is the right device.
+ * ->detect() can not be NULL.
+ */
+static int spinand_manufacturer_detect(struct spinand_device *chip)
+{
+ int i = 0;
+
+ for (; i < ARRAY_SIZE(spinand_manufacturers); i++) {
+ if (spinand_manufacturers[i]->ops->detect(chip)) {
+ chip->manufacturer.manu = spinand_manufacturers[i];
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+/*
+ * spinand_manufacturer_init - manufacturer initialization function.
+ * @chip: SPI NAND device structure
+ *
+ * Manufacturer drivers should put all their specific initialization code in
+ * their ->init() hook.
+ */
+static int spinand_manufacturer_init(struct spinand_device *chip)
+{
+ if (chip->manufacturer.manu->ops->init)
+ return chip->manufacturer.manu->ops->init(chip);
+
+ return 0;
+}
+
+/*
+ * spinand_manufacturer_cleanup - manufacturer cleanup function.
+ * @chip: SPI NAND device structure
+ *
+ * Manufacturer drivers should put all their specific cleanup code in their
+ * ->cleanup() hook.
+ */
+static void spinand_manufacturer_cleanup(struct spinand_device *chip)
+{
+ /* Release manufacturer private data */
+ if (chip->manufacturer.manu->ops->cleanup)
+ return chip->manufacturer.manu->ops->cleanup(chip);
+}
+
+/*
+ * spinand_dt_init - Initialize SPI NAND by device tree node
+ * @chip: SPI NAND device structure
+ *
+ * TODO: put ecc_mode, ecc_strength, ecc_step, bbt, etc in here
+ * and move it in generic NAND core.
+ */
+static void spinand_dt_init(struct spinand_device *chip)
+{
+}
+
+/*
+ * spinand_detect - detect the SPI NAND device
+ * @chip: SPI NAND device structure
+ */
+static int spinand_detect(struct spinand_device *chip)
+{
+ struct nand_device *nand = &chip->base;
+ int ret;
+
+ spinand_reset(chip);
+ spinand_read_id(chip, chip->id.data);
+ chip->id.len = SPINAND_MAX_ID_LEN;
+
+ ret = spinand_manufacturer_detect(chip);
+ if (ret) {
+ dev_err(chip->dev, "unknown raw ID %*phN\n",
+ SPINAND_MAX_ID_LEN, chip->id.data);
+ goto out;
+ }
+
+ dev_info(chip->dev, "%s (%s) is found.\n", chip->name,
+ chip->manufacturer.manu->name);
+ dev_info(chip->dev,
+ "%d MiB, block size: %d KiB, page size: %d, OOB size: %d\n",
+ (int)(nand_size(nand) >> 20), nand_eraseblock_size(nand) >> 10,
+ nand_page_size(nand), nand_per_page_oobsize(nand));
+
+out:
+ return ret;
+}
+
+/*
+ * spinand_init - initialize the SPI NAND device
+ * @chip: SPI NAND device structure
+ */
+static int spinand_init(struct spinand_device *chip)
+{
+ struct mtd_info *mtd = spinand_to_mtd(chip);
+ struct nand_device *nand = mtd_to_nand(mtd);
+ struct spinand_ecc_engine *ecc_engine;
+ int ret;
+
+ spinand_dt_init(chip);
+ spinand_set_rd_wr_op(chip);
+
+ chip->buf = devm_kzalloc(chip->dev,
+ nand_page_size(nand) +
+ nand_per_page_oobsize(nand),
+ GFP_KERNEL);
+ if (!chip->buf) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ chip->oobbuf = chip->buf + nand_page_size(nand);
+
+ spinand_manufacturer_init(chip);
+
+ mtd->name = chip->name;
+ mtd->size = nand_size(nand);
+ mtd->erasesize = nand_eraseblock_size(nand);
+ mtd->writesize = nand_page_size(nand);
+ mtd->writebufsize = mtd->writesize;
+ mtd->owner = THIS_MODULE;
+ mtd->type = MTD_NANDFLASH;
+ mtd->flags = MTD_CAP_NANDFLASH;
+ if (!mtd->ecc_strength)
+ mtd->ecc_strength = ecc_engine->strength ?
+ ecc_engine->strength : 1;
+
+ mtd->oobsize = nand_per_page_oobsize(nand);
+ ret = mtd_ooblayout_count_freebytes(mtd);
+ if (ret < 0)
+ ret = 0;
+ mtd->oobavail = ret;
+
+ if (!mtd->bitflip_threshold)
+ mtd->bitflip_threshold = DIV_ROUND_UP(mtd->ecc_strength * 3,
+ 4);
+ /* After power up, all blocks are locked, so unlock it here. */
+ spinand_lock_block(chip, BL_ALL_UNLOCKED);
+
+ return nand_register(nand);
+
+err:
+ return ret;
+}
+
+/*
+ * spinand_alloc - [SPI NAND Interface] allocate SPI NAND device instance
+ * @dev: pointer to device model structure
+ */
+struct spinand_device *spinand_alloc(struct device *dev)
+{
+ struct spinand_device *chip;
+ struct mtd_info *mtd;
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return ERR_PTR(-ENOMEM);
+
+ spinand_set_of_node(chip, dev->of_node);
+ mutex_init(&chip->lock);
+ chip->dev = dev;
+ mtd = spinand_to_mtd(chip);
+ mtd->dev.parent = dev;
+
+ return chip;
+}
+EXPORT_SYMBOL_GPL(spinand_alloc);
+
+/*
+ * spinand_free - [SPI NAND Interface] free SPI NAND device instance
+ * @chip: SPI NAND device structure
+ */
+void spinand_free(struct spinand_device *chip)
+{
+ devm_kfree(chip->dev, chip);
+}
+EXPORT_SYMBOL_GPL(spinand_free);
+
+/*
+ * spinand_register - [SPI NAND Interface] register SPI NAND device
+ * @chip: SPI NAND device structure
+ */
+int spinand_register(struct spinand_device *chip)
+{
+ int ret;
+
+ ret = spinand_detect(chip);
+ if (ret) {
+ dev_err(chip->dev,
+ "Detect SPI NAND failed with error %d.\n", ret);
+ return ret;
+ }
+
+ ret = spinand_init(chip);
+ if (ret)
+ dev_err(chip->dev,
+ "Init SPI NAND failed with error %d.\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(spinand_register);
+
+/*
+ * spinand_unregister - [SPI NAND Interface] unregister SPI NAND device
+ * @chip: SPI NAND device structure
+ */
+int spinand_unregister(struct spinand_device *chip)
+{
+ struct nand_device *nand = &chip->base;
+
+ nand_unregister(nand);
+ spinand_manufacturer_cleanup(chip);
+ devm_kfree(chip->dev, chip->buf);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(spinand_unregister);
+
+MODULE_DESCRIPTION("SPI NAND framework");
+MODULE_AUTHOR("Peter Pan<peterpandong at micron.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
new file mode 100644
index 0000000..78ea9a6
--- /dev/null
+++ b/include/linux/mtd/spinand.h
@@ -0,0 +1,257 @@
+/*
+ *
+ * Copyright (c) 2009-2017 Micron Technology, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#ifndef __LINUX_MTD_SPINAND_H
+#define __LINUX_MTD_SPINAND_H
+
+#include <linux/mutex.h>
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+
+/*
+ * Standard SPI NAND flash commands
+ */
+#define SPINAND_CMD_RESET 0xff
+#define SPINAND_CMD_GET_FEATURE 0x0f
+#define SPINAND_CMD_SET_FEATURE 0x1f
+#define SPINAND_CMD_PAGE_READ 0x13
+#define SPINAND_CMD_READ_FROM_CACHE 0x03
+#define SPINAND_CMD_READ_FROM_CACHE_FAST 0x0b
+#define SPINAND_CMD_READ_FROM_CACHE_X2 0x3b
+#define SPINAND_CMD_READ_FROM_CACHE_DUAL_IO 0xbb
+#define SPINAND_CMD_READ_FROM_CACHE_X4 0x6b
+#define SPINAND_CMD_READ_FROM_CACHE_QUAD_IO 0xeb
+#define SPINAND_CMD_BLK_ERASE 0xd8
+#define SPINAND_CMD_PROG_EXC 0x10
+#define SPINAND_CMD_PROG_LOAD 0x02
+#define SPINAND_CMD_PROG_LOAD_RDM_DATA 0x84
+#define SPINAND_CMD_PROG_LOAD_X4 0x32
+#define SPINAND_CMD_PROG_LOAD_RDM_DATA_X4 0x34
+#define SPINAND_CMD_READ_ID 0x9f
+#define SPINAND_CMD_WR_DISABLE 0x04
+#define SPINAND_CMD_WR_ENABLE 0x06
+
+/* feature register */
+#define REG_BLOCK_LOCK 0xa0
+#define REG_CFG 0xb0
+#define REG_STATUS 0xc0
+
+/* status register */
+#define STATUS_OIP_MASK BIT(0)
+#define STATUS_CRBSY_MASK BIT(7)
+#define STATUS_READY 0
+#define STATUS_BUSY BIT(0)
+
+#define STATUS_E_FAIL_MASK BIT(2)
+#define STATUS_E_FAIL BIT(2)
+
+#define STATUS_P_FAIL_MASK BIT(3)
+#define STATUS_P_FAIL BIT(3)
+
+/* configuration register */
+#define CFG_ECC_MASK BIT(4)
+#define CFG_ECC_ENABLE BIT(4)
+
+/* block lock register */
+#define BL_ALL_UNLOCKED 0X00
+
+struct spinand_op;
+struct spinand_device;
+
+#define SPINAND_MAX_ID_LEN 4
+
+/*
+ * struct spinand_id - SPI NAND id structure
+ * @data: buffer containing the id bytes. Currently 4 bytes large, but can
+ * be extended if required.
+ * @len: ID length.
+ */
+struct spinand_id {
+ u8 data[SPINAND_MAX_ID_LEN];
+ int len;
+};
+
+struct spinand_controller_ops {
+ int (*exec_op)(struct spinand_device *chip,
+ struct spinand_op *op);
+};
+
+struct spinand_manufacturer_ops {
+ /*
+ * Firstly, ->detect() should not be NULL.
+ * ->detect() implementation for manufacturer A never sends
+ * any manufacturer specific SPI command to a SPI NAND from
+ * manufacturer B, so the proper way is to decode the raw id
+ * data in chip->id.data first, if manufacture ID dismatch,
+ * return directly and let others to detect.
+ */
+ bool (*detect)(struct spinand_device *chip);
+ int (*init)(struct spinand_device *chip);
+ void (*cleanup)(struct spinand_device *chip);
+};
+
+struct spinand_manufacturer {
+ u8 id;
+ char *name;
+ const struct spinand_manufacturer_ops *ops;
+};
+
+struct spinand_ecc_engine_ops {
+ void (*get_ecc_status)(struct spinand_device *chip,
+ unsigned int status, unsigned int *corrected,
+ unsigned int *ecc_errors);
+ void (*disable_ecc)(struct spinand_device *chip);
+ void (*enable_ecc)(struct spinand_device *chip);
+};
+
+enum spinand_ecc_type {
+ SPINAND_ECC_ONDIE,
+ SPINAND_ECC_HW,
+};
+
+struct spinand_ecc_engine {
+ u32 strength;
+ u32 steps;
+ const struct spinand_ecc_engine_ops *ops;
+};
+
+#define SPINAND_CAP_RD_X1 BIT(0)
+#define SPINAND_CAP_RD_X2 BIT(1)
+#define SPINAND_CAP_RD_X4 BIT(2)
+#define SPINAND_CAP_RD_DUAL BIT(3)
+#define SPINAND_CAP_RD_QUAD BIT(4)
+#define SPINAND_CAP_WR_X1 BIT(5)
+#define SPINAND_CAP_WR_X2 BIT(6)
+#define SPINAND_CAP_WR_X4 BIT(7)
+#define SPINAND_CAP_WR_DUAL BIT(8)
+#define SPINAND_CAP_WR_QUAD BIT(9)
+#define SPINAND_CAP_HW_ECC BIT(10)
+
+struct spinand_controller {
+ struct spinand_controller_ops *ops;
+ u32 caps;
+};
+
+/*
+ * struct spinand_device - SPI NAND device
+ * @base: NAND device instance
+ * @lock: protection lock
+ * @name: name of the chip
+ * @dev: struct device pointer
+ * @id: ID structure
+ * @read_cache_op: Opcode of read from cache
+ * @write_cache_op: Opcode of program load
+ * @buf: buffer for read/write data
+ * @oobbuf: buffer for read/write oob
+ * @rw_mode: read/write mode of SPI NAND chip
+ * @controller: SPI NAND controller instance
+ * @manufacturer: SPI NAND manufacturer instance, describe
+ * manufacturer related objects
+ * @ecc_engine: SPI NAND ECC engine instance
+ */
+struct spinand_device {
+ struct nand_device base;
+ struct mutex lock;
+ char *name;
+ struct device *dev;
+ struct spinand_id id;
+ u8 read_cache_op;
+ u8 write_cache_op;
+ u8 *buf;
+ u8 *oobbuf;
+ u32 rw_mode;
+ struct {
+ struct spinand_controller *controller;
+ void *priv;
+ } controller;
+ struct {
+ const struct spinand_manufacturer *manu;
+ void *priv;
+ } manufacturer;
+ struct {
+ struct spinand_ecc_engine *engine;
+ enum spinand_ecc_type type;
+ void *context;
+ } ecc;
+};
+
+static inline struct spinand_device *mtd_to_spinand(struct mtd_info *mtd)
+{
+ return container_of(mtd_to_nand(mtd), struct spinand_device, base);
+}
+
+static inline struct mtd_info *spinand_to_mtd(struct spinand_device *chip)
+{
+ return nand_to_mtd(&chip->base);
+}
+
+static inline void spinand_set_of_node(struct spinand_device *chip,
+ struct device_node *np)
+{
+ nand_set_of_node(&chip->base, np);
+}
+
+#define SPINAND_MAX_ADDR_LEN 4
+
+/*
+ * struct spinand_op - SPI NAND operation description
+ * @cmd: opcode to send
+ * @n_addr: address bytes
+ * @addr_nbits: number of bit used to transfer address
+ * @dummy_types: dummy bytes followed address
+ * @addr: buffer held address
+ * @n_tx: size of tx_buf
+ * @tx_buf: data to be written
+ * @n_rx: size of rx_buf
+ * @rx_buf: data to be read
+ * @data_nbits: number of bit used to transfer data
+ */
+struct spinand_op {
+ u8 cmd;
+ u8 n_addr;
+ u8 addr_nbits;
+ u8 dummy_bytes;
+ u8 addr[SPINAND_MAX_ADDR_LEN];
+ u32 n_tx;
+ const u8 *tx_buf;
+ u32 n_rx;
+ u8 *rx_buf;
+ u8 data_nbits;
+};
+
+/* SPI NAND supported OP mode */
+#define SPINAND_RD_X1 0x00000001
+#define SPINAND_RD_X2 0x00000002
+#define SPINAND_RD_X4 0x00000004
+#define SPINAND_RD_DUAL 0x00000008
+#define SPINAND_RD_QUAD 0x00000010
+#define SPINAND_WR_X1 0x00000020
+#define SPINAND_WR_X2 0x00000040
+#define SPINAND_WR_X4 0x00000080
+#define SPINAND_WR_DUAL 0x00000100
+#define SPINAND_WR_QUAD 0x00000200
+
+#define SPINAND_RD_COMMON (SPINAND_RD_X1 | SPINAND_RD_X2 | \
+ SPINAND_RD_X4 | SPINAND_RD_DUAL | \
+ SPINAND_RD_QUAD)
+#define SPINAND_WR_COMMON (SPINAND_WR_X1 | SPINAND_WR_X4)
+#define SPINAND_OP_COMMON (SPINAND_RD_COMMON | SPINAND_WR_COMMON)
+
+struct spinand_device *spinand_alloc(struct device *dev);
+void spinand_free(struct spinand_device *chip);
+int spinand_register(struct spinand_device *chip);
+int spinand_unregister(struct spinand_device *chip);
+#endif /* __LINUX_MTD_SPINAND_H */
--
1.9.1
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