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Subject[PATCHv2] drivers: mtd: spinand: Add generic spinand frameowrk.
Date
From: Mona Anonuevo <manonuevo@micron.com>

This patch adds support for a generic spinand framework(spinand_mtd.c).
This frameowrk can be used for other spi based flash devices. The idea
is to have a common model under drivers/mtd, as also present for other non spi
devices(there is a generic framework and device part simply attaches itself to it.)

Signed-off-by: Mona Anonuevo <manonuevo@micron.com>
Signed-off-by: Tuan Nguyen <tqnguyen@micron.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
----
This patch was sent as a part of a series[1];
but this can go in as a standalone patch.
[1]: https://lkml.org/lkml/2013/6/26/83

v1->v2:
seperated the specific micron driver,
flash devices can attach itself seperately to this
generic framework.

drivers/mtd/Kconfig | 2 +
drivers/mtd/Makefile | 2 +
drivers/mtd/spinand/Kconfig | 24 ++
drivers/mtd/spinand/Makefile | 8 +
drivers/mtd/spinand/spinand_mtd.c | 690 +++++++++++++++++++++++++++++++++++++
include/linux/mtd/spinand.h | 155 +++++++++
6 files changed, 881 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/spinand/Kconfig
create mode 100644 drivers/mtd/spinand/Makefile
create mode 100644 drivers/mtd/spinand/spinand_mtd.c
create mode 100644 include/linux/mtd/spinand.h

diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 5fab4e6..c9e6c60 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -318,6 +318,8 @@ source "drivers/mtd/nand/Kconfig"

source "drivers/mtd/onenand/Kconfig"

+source "drivers/mtd/spinand/Kconfig"
+
source "drivers/mtd/lpddr/Kconfig"

source "drivers/mtd/ubi/Kconfig"
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index 4cfb31e..cce68db 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -32,4 +32,6 @@ inftl-objs := inftlcore.o inftlmount.o

obj-y += chips/ lpddr/ maps/ devices/ nand/ onenand/ tests/

+obj-y += spinand/
+
obj-$(CONFIG_MTD_UBI) += ubi/
diff --git a/drivers/mtd/spinand/Kconfig b/drivers/mtd/spinand/Kconfig
new file mode 100644
index 0000000..38c739f
--- /dev/null
+++ b/drivers/mtd/spinand/Kconfig
@@ -0,0 +1,24 @@
+#
+# linux/drivers/mtd/spinand/Kconfig
+#
+
+menuconfig MTD_SPINAND
+ tristate "SPINAND Device Support"
+ depends on MTD
+ help
+ This enables support for accessing Micron SPI NAND flash
+ devices.
+
+if MTD_SPINAND
+
+config MTD_SPINAND_ONDIEECC
+ bool "Use SPINAND internal ECC"
+ help
+ Internel ECC
+
+config MTD_SPINAND_SWECC
+ bool "Use software ECC"
+ depends on MTD_NAND
+ help
+ software ECC
+endif
diff --git a/drivers/mtd/spinand/Makefile b/drivers/mtd/spinand/Makefile
new file mode 100644
index 0000000..be18de7
--- /dev/null
+++ b/drivers/mtd/spinand/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for the SPI NAND MTD
+#
+
+# Core functionality.
+obj-$(CONFIG_MTD_SPINAND) += spinand.o
+
+spinand-objs := spinand_mtd.o
diff --git a/drivers/mtd/spinand/spinand_mtd.c b/drivers/mtd/spinand/spinand_mtd.c
new file mode 100644
index 0000000..8bfff86
--- /dev/null
+++ b/drivers/mtd/spinand/spinand_mtd.c
@@ -0,0 +1,690 @@
+/*
+spinand_mtd.c
+
+Copyright (c) 2009-2010 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/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/spinand.h>
+#include <linux/mtd/nand_ecc.h>
+
+/**
+ * spinand_get_device - [GENERIC] Get chip for selected access
+ * @param mtd MTD device structure
+ * @param new_state the state which is requested
+ *
+ * Get the device and lock it for exclusive access
+ */
+#define mu_spi_nand_driver_version "Beagle-MTD_01.00_Linux2.6.33_20100507"
+
+static int spinand_get_device(struct mtd_info *mtd, int new_state)
+{
+ struct spinand_chip *this = mtd->priv;
+ DECLARE_WAITQUEUE(wait, current);
+
+ /*
+ * Grab the lock and see if the device is available
+ */
+ while (1) {
+ spin_lock(&this->chip_lock);
+ if (this->state == FL_READY) {
+ this->state = new_state;
+ spin_unlock(&this->chip_lock);
+ break;
+ }
+ if (new_state == FL_PM_SUSPENDED) {
+ spin_unlock(&this->chip_lock);
+ return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
+ }
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&this->wq, &wait);
+ spin_unlock(&this->chip_lock);
+ schedule();
+ remove_wait_queue(&this->wq, &wait);
+ }
+ return 0;
+}
+
+/**
+ * spinand_release_device - [GENERIC] release chip
+ * @param mtd MTD device structure
+ *
+ * Deselect, release chip lock and wake up anyone waiting on the device
+ */
+static void spinand_release_device(struct mtd_info *mtd)
+{
+ struct spinand_chip *this = mtd->priv;
+
+ /* Release the chip */
+ spin_lock(&this->chip_lock);
+ this->state = FL_READY;
+ wake_up(&this->wq);
+ spin_unlock(&this->chip_lock);
+}
+
+#ifdef CONFIG_MTD_SPINAND_SWECC
+static void spinand_calculate_ecc(struct mtd_info *mtd)
+{
+ int i;
+ int eccsize = 512;
+ int eccbytes = 3;
+ int eccsteps = 4;
+ int ecctotal = 12;
+ struct spinand_chip *chip = mtd->priv;
+ struct spinand_info *info = chip->info;
+ unsigned char *p = chip->buf;
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
+ __nand_calculate_ecc(p, eccsize, &chip->ecc_calc[i]);
+
+ for (i = 0; i < ecctotal; i++)
+ chip->buf[info->page_main_size +
+ info->ecclayout->eccpos[i]] = chip->ecc_calc[i];
+}
+
+static int spinand_correct_data(struct mtd_info *mtd)
+{
+ int i;
+ int eccsize = 512;
+ int eccbytes = 3;
+ int eccsteps = 4;
+ int ecctotal = 12;
+ struct spinand_chip *chip = mtd->priv;
+ struct spinand_info *info = chip->info;
+ unsigned char *p = chip->buf;
+ int errcode = 0;
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
+ __nand_calculate_ecc(p, eccsize, &chip->ecc_calc[i]);
+
+ for (i = 0; i < ecctotal; i++)
+ chip->ecc_code[i] = chip->buf[info->page_main_size +
+ info->ecclayout->eccpos[i]];
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
+ int stat;
+
+ stat = __nand_correct_data(p, &chip->ecc_code[i],
+ &chip->ecc_calc[i], eccsize);
+ if (stat < 0)
+ errcode = -1;
+ else if (stat == 1)
+ errcode = 1;
+ }
+ return errcode;
+}
+#endif
+
+static int spinand_read_ops(struct mtd_info *mtd, loff_t from,
+ struct mtd_oob_ops *ops)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ int page_id, page_offset, page_num, oob_num;
+
+ int count;
+ int main_ok, main_left, main_offset;
+ int oob_ok, oob_left;
+
+ signed int retval;
+ signed int errcode = 0;
+
+ if (!chip->buf)
+ return -1;
+
+ page_id = from >> info->page_shift;
+
+ /* for main data */
+ page_offset = from & info->page_mask;
+ page_num = (page_offset + ops->len +
+ info->page_main_size - 1) / info->page_main_size;
+
+ /* for oob */
+ if (info->ecclayout->oobavail)
+ oob_num = (ops->ooblen +
+ info->ecclayout->oobavail - 1) / info->ecclayout->oobavail;
+ else
+ oob_num = 0;
+
+ count = 0;
+
+ main_left = ops->len;
+ main_ok = 0;
+ main_offset = page_offset;
+
+ oob_left = ops->ooblen;
+ oob_ok = 0;
+
+ while (1) {
+ if (count < page_num || count < oob_num) {
+ memset(chip->buf, 0, info->page_size);
+ retval = chip->read_page(spi_nand, info,
+ page_id + count, 0, info->page_size,
+ chip->buf);
+ if (retval != 0) {
+ errcode = -1;
+ pr_info(KERN_INFO
+ "spinand_read_ops: fail, page=%d!\n",
+ page_id);
+ return errcode;
+ }
+ } else {
+ break;
+ }
+ if (count < page_num && ops->datbuf) {
+ int size;
+
+#ifdef CONFIG_MTD_SPINAND_SWECC
+ retval = spinand_correct_data(mtd);
+ if (retval == -1)
+ pr_info(KERN_INFO
+ "SWECC uncorrectable error! page=%x\n",
+ page_id+count);
+ else if (retval == 1)
+ pr_info(KERN_INFO
+ "SWECC 1 bit error, corrected! page=%x\n",
+ page_id+count);
+#endif
+
+ if ((main_offset + main_left) < info->page_main_size)
+ size = main_left;
+ else
+ size = info->page_main_size - main_offset;
+
+ memcpy(ops->datbuf + main_ok, chip->buf, size);
+
+ main_ok += size;
+ main_left -= size;
+ main_offset = 0;
+ ops->retlen = main_ok;
+ }
+
+ if (count < oob_num && ops->oobbuf && chip->oobbuf) {
+ int size;
+ int offset, len, temp;
+
+ /* repack spare to oob */
+ memset(chip->oobbuf, 0, info->ecclayout->oobavail);
+
+ temp = 0;
+ offset = info->ecclayout->oobfree[0].offset;
+ len = info->ecclayout->oobfree[0].length;
+ memcpy(chip->oobbuf + temp,
+ chip->buf + info->page_main_size + offset, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[1].offset;
+ len = info->ecclayout->oobfree[1].length;
+ memcpy(chip->oobbuf + temp,
+ chip->buf + info->page_main_size + offset, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[2].offset;
+ len = info->ecclayout->oobfree[2].length;
+ memcpy(chip->oobbuf + temp,
+ chip->buf + info->page_main_size + offset, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[3].offset;
+ len = info->ecclayout->oobfree[3].length;
+ memcpy(chip->oobbuf + temp,
+ chip->buf + info->page_main_size + offset, len);
+
+ /* copy oobbuf to ops oobbuf */
+ if (oob_left < info->ecclayout->oobavail)
+ size = oob_left;
+ else
+ size = info->ecclayout->oobavail;
+
+ memcpy(ops->oobbuf + oob_ok, chip->oobbuf, size);
+
+ oob_ok += size;
+ oob_left -= size;
+
+ ops->oobretlen = oob_ok;
+ }
+ count++;
+ }
+ return errcode;
+}
+
+static int spinand_write_ops(struct mtd_info *mtd, loff_t to,
+ struct mtd_oob_ops *ops)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ int page_id, page_offset, page_num, oob_num;
+
+ int count;
+
+ int main_ok, main_left, main_offset;
+ int oob_ok, oob_left;
+
+ signed int retval;
+ signed int errcode = 0;
+
+ if (!chip->buf)
+ return -1;
+
+ page_id = to >> info->page_shift;
+
+ /* for main data */
+ page_offset = to & info->page_mask;
+ page_num = (page_offset + ops->len +
+ info->page_main_size - 1) / info->page_main_size;
+
+ /* for oob */
+ if (info->ecclayout->oobavail)
+ oob_num = (ops->ooblen +
+ info->ecclayout->oobavail - 1) / info->ecclayout->oobavail;
+ else
+ oob_num = 0;
+
+ count = 0;
+
+ main_left = ops->len;
+ main_ok = 0;
+ main_offset = page_offset;
+
+ oob_left = ops->ooblen;
+ oob_ok = 0;
+
+ while (1) {
+ if (count < page_num || count < oob_num)
+ memset(chip->buf, 0xFF, info->page_size);
+ else
+ break;
+
+ if (count < page_num && ops->datbuf) {
+ int size;
+
+ if ((main_offset + main_left) < info->page_main_size)
+ size = main_left;
+ else
+ size = info->page_main_size - main_offset;
+
+ memcpy(chip->buf, ops->datbuf + main_ok, size);
+
+ main_ok += size;
+ main_left -= size;
+ main_offset = 0;
+
+#ifdef CONFIG_MTD_SPINAND_SWECC
+ spinand_calculate_ecc(mtd);
+#endif
+ }
+
+ if (count < oob_num && ops->oobbuf && chip->oobbuf) {
+ int size;
+ int offset, len, temp;
+
+ memset(chip->oobbuf, 0xFF, info->ecclayout->oobavail);
+
+ if (oob_left < info->ecclayout->oobavail)
+ size = oob_left;
+ else
+ size = info->ecclayout->oobavail;
+
+ memcpy(chip->oobbuf, ops->oobbuf + oob_ok, size);
+
+ oob_ok += size;
+ oob_left -= size;
+
+ /* repack oob to spare */
+ temp = 0;
+ offset = info->ecclayout->oobfree[0].offset;
+ len = info->ecclayout->oobfree[0].length;
+ memcpy(chip->buf + info->page_main_size + offset,
+ chip->oobbuf + temp, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[1].offset;
+ len = info->ecclayout->oobfree[1].length;
+ memcpy(chip->buf + info->page_main_size + offset,
+ chip->oobbuf + temp, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[2].offset;
+ len = info->ecclayout->oobfree[2].length;
+ memcpy(chip->buf + info->page_main_size + offset,
+ chip->oobbuf + temp, len);
+
+ temp += len;
+ offset = info->ecclayout->oobfree[3].offset;
+ len = info->ecclayout->oobfree[3].length;
+ memcpy(chip->buf + info->page_main_size + offset,
+ chip->oobbuf + temp, len);
+ }
+
+ if (count < page_num || count < oob_num) {
+ retval = chip->program_page(spi_nand, info,
+ page_id + count, 0, info->page_size, chip->buf);
+ if (retval != 0) {
+ errcode = -1;
+ pr_err(KERN_INFO "spinand_write_ops: fail, page=%d!\n", page_id);
+
+ return errcode;
+ }
+ }
+
+ if (count < page_num && ops->datbuf)
+ ops->retlen = main_ok;
+
+ if (count < oob_num && ops->oobbuf && chip->oobbuf)
+ ops->oobretlen = oob_ok;
+
+ count++;
+ }
+ return errcode;
+}
+
+static int spinand_read(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct mtd_oob_ops ops = {0};
+ int ret;
+
+ /* Do not allow reads past end of device */
+ if ((from + len) > mtd->size)
+ return -EINVAL;
+
+ if (!len)
+ return 0;
+
+ spinand_get_device(mtd, FL_READING);
+
+ ops.len = len;
+ ops.datbuf = buf;
+
+ ret = spinand_read_ops(mtd, from, &ops);
+
+ *retlen = ops.retlen;
+
+ spinand_release_device(mtd);
+
+ return ret;
+}
+
+static int spinand_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct mtd_oob_ops ops = {0};
+ int ret;
+
+ /* Do not allow reads past end of device */
+ if ((to + len) > mtd->size)
+ return -EINVAL;
+ if (!len)
+ return 0;
+
+ spinand_get_device(mtd, FL_WRITING);
+
+ ops.len = len;
+ ops.datbuf = (uint8_t *)buf;
+
+ ret = spinand_write_ops(mtd, to, &ops);
+
+ *retlen = ops.retlen;
+
+ spinand_release_device(mtd);
+
+ return ret;
+}
+
+static int spinand_read_oob(struct mtd_info *mtd, loff_t from,
+ struct mtd_oob_ops *ops)
+{
+ int ret;
+
+ spinand_get_device(mtd, FL_READING);
+
+ ret = spinand_read_ops(mtd, from, ops);
+
+ spinand_release_device(mtd);
+ return ret;
+}
+
+static int spinand_write_oob(struct mtd_info *mtd, loff_t to,
+ struct mtd_oob_ops *ops)
+{
+ int ret;
+
+ spinand_get_device(mtd, FL_WRITING);
+
+ ret = spinand_write_ops(mtd, to, ops);
+
+ spinand_release_device(mtd);
+ return ret;
+}
+
+/**
+ * spinand_erase - [MTD Interface] erase block(s)
+ * @param mtd MTD device structure
+ * @param instr erase instruction
+ *
+ * Erase one ore more blocks
+ */
+static int spinand_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ u16 block_id, block_num, count;
+ signed int retval = 0;
+ signed int errcode = 0;
+
+ pr_info("spinand_erase: start = 0x%012llx, len = %llu\n",
+ (unsigned long long)instr->addr, (unsigned long long)instr->len);
+
+ /* check address align on block boundary */
+ if (instr->addr & (info->block_main_size - 1)) {
+ pr_err("spinand_erase: Unaligned address\n");
+ return -EINVAL;
+ }
+
+ if (instr->len & (info->block_main_size - 1)) {
+ pr_err("spinand_erase: ""Length not block aligned\n");
+ return -EINVAL;
+ }
+
+ /* Do not allow erase past end of device */
+ if ((instr->len + instr->addr) > info->usable_size) {
+ pr_err("spinand_erase: ""Erase past end of device\n");
+ return -EINVAL;
+ }
+
+ instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
+
+ /* Grab the lock and see if the device is available */
+ spinand_get_device(mtd, FL_ERASING);
+
+ block_id = instr->addr >> info->block_shift;
+ block_num = instr->len >> info->block_shift;
+ count = 0;
+
+ while (count < block_num) {
+ retval = chip->erase_block(spi_nand, info, block_id + count);
+
+ if (retval != 0) {
+ retval = chip->erase_block(spi_nand, info,
+ block_id + count);
+ if (retval != 0) {
+ pr_info(KERN_INFO "spinand_erase: fail, block=%d!\n",
+ block_id + count);
+ errcode = -1;
+ }
+ }
+ count++;
+ }
+
+ if (errcode == 0)
+ instr->state = MTD_ERASE_DONE;
+
+ /* Deselect and wake up anyone waiting on the device */
+ spinand_release_device(mtd);
+
+ /* Do call back function */
+ if (instr->callback)
+ instr->callback(instr);
+
+ return errcode;
+}
+
+/**
+ * spinand_sync - [MTD Interface] sync
+ * @param mtd MTD device structure
+ *
+ * Sync is actually a wait for chip ready function
+ */
+static void spinand_sync(struct mtd_info *mtd)
+{
+ pr_debug("spinand_sync: called\n");
+
+ /* Grab the lock and see if the device is available */
+ spinand_get_device(mtd, FL_SYNCING);
+
+ /* Release it and go back */
+ spinand_release_device(mtd);
+}
+
+static int spinand_block_isbad(struct mtd_info *mtd, loff_t ofs)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ u16 block_id;
+ u8 is_bad = 0x00;
+ u8 ret = 0;
+
+ spinand_get_device(mtd, FL_READING);
+
+ block_id = ofs >> info->block_shift;
+
+ chip->read_page(spi_nand, info, block_id*info->page_num_per_block,
+ info->page_main_size, 1, &is_bad);
+
+ if (is_bad != 0xFF)
+ ret = 1;
+
+ spinand_release_device(mtd);
+
+ return ret;
+}
+
+/**
+ * spinand_block_markbad - [MTD Interface] Mark bad block
+ * @param mtd MTD device structure
+ * @param ofs Bad block number
+ */
+static int spinand_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spi_device *spi_nand = chip->spi_nand;
+ struct spinand_info *info = chip->info;
+ u16 block_id;
+ u8 is_bad = 0x00;
+ u8 ret = 0;
+
+ spinand_get_device(mtd, FL_WRITING);
+
+ block_id = ofs >> info->block_shift;
+
+ chip->program_page(spi_nand, info, block_id*info->page_num_per_block,
+ info->page_main_size, 1, &is_bad);
+
+ spinand_release_device(mtd);
+
+ return ret;
+}
+
+
+/**
+ * spinand_suspend - [MTD Interface] Suspend the spinand flash
+ * @param mtd MTD device structure
+ */
+static int spinand_suspend(struct mtd_info *mtd)
+{
+ return spinand_get_device(mtd, FL_PM_SUSPENDED);
+}
+
+/**
+ * spinand_resume - [MTD Interface] Resume the spinand flash
+ * @param mtd MTD device structure
+ */
+static void spinand_resume(struct mtd_info *mtd)
+{
+ struct spinand_chip *this = mtd->priv;
+
+ if (this->state == FL_PM_SUSPENDED)
+ spinand_release_device(mtd);
+ else
+ pr_err(KERN_ERR "resume() called for the chip which is not" "in suspended state\n");
+}
+
+/**
+ * spinand_mtd - add MTD device with parameters
+ * @param mtd MTD device structure
+ *
+ * Add MTD device with parameters.
+ */
+int spinand_mtd(struct mtd_info *mtd)
+{
+ struct spinand_chip *chip = mtd->priv;
+ struct spinand_info *info = chip->info;
+
+ chip->state = FL_READY;
+ init_waitqueue_head(&chip->wq);
+ spin_lock_init(&chip->chip_lock);
+
+ mtd->name = info->name;
+ mtd->size = info->usable_size;
+ mtd->erasesize = info->block_main_size;
+ mtd->writesize = info->page_main_size;
+ mtd->oobsize = info->page_spare_size;
+ mtd->owner = THIS_MODULE;
+ mtd->type = MTD_NANDFLASH;
+ mtd->flags = MTD_CAP_NANDFLASH;
+
+ mtd->ecclayout = info->ecclayout;
+
+ mtd->_erase = spinand_erase;
+ mtd->_point = NULL;
+ mtd->_unpoint = NULL;
+ mtd->_read = spinand_read;
+ mtd->_write = spinand_write;
+ mtd->_read_oob = spinand_read_oob;
+ mtd->_write_oob = spinand_write_oob;
+ mtd->_sync = spinand_sync;
+ mtd->_lock = NULL;
+ mtd->_unlock = NULL;
+ mtd->_suspend = spinand_suspend;
+ mtd->_resume = spinand_resume;
+ mtd->_block_isbad = spinand_block_isbad;
+ mtd->_block_markbad = spinand_block_markbad;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(spinand_mtd);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Henry Pan<hspan@micron.com>");
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
new file mode 100644
index 0000000..3b8802a
--- /dev/null
+++ b/include/linux/mtd/spinand.h
@@ -0,0 +1,155 @@
+/*
+ * linux/include/linux/mtd/spinand.h
+ * Copyright (c) 2009-2010 Micron Technology, Inc.
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+
+ * 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.
+/bin/bash: 4: command not found
+ *
+ * based on nand.h
+ */
+#ifndef __LINUX_MTD_SPI_NAND_H
+#define __LINUX_MTD_SPI_NAND_H
+
+#include <linux/wait.h>
+#include <linux/spinlock.h>
+#include <linux/mtd/mtd.h>
+
+/* cmd */
+#define CMD_READ 0x13
+#define CMD_READ_RDM 0x03
+#define CMD_PROG_PAGE_CLRCACHE 0x02
+#define CMD_PROG_PAGE 0x84
+#define CMD_PROG_PAGE_EXC 0x10
+#define CMD_ERASE_BLK 0xd8
+#define CMD_WR_ENABLE 0x06
+#define CMD_WR_DISABLE 0x04
+#define CMD_READ_ID 0x9f
+#define CMD_RESET 0xff
+#define CMD_READ_REG 0x0f
+#define CMD_WRITE_REG 0x1f
+
+/* feature/ status reg */
+#define REG_BLOCK_LOCK 0xa0
+#define REG_OTP 0xb0
+#define REG_STATUS 0xc0/* timing */
+
+/* status */
+#define STATUS_OIP_MASK 0x01
+#define STATUS_READY (0 << 0)
+#define STATUS_BUSY (1 << 0)
+
+#define STATUS_E_FAIL_MASK 0x04
+#define STATUS_E_FAIL (1 << 2)
+
+#define STATUS_P_FAIL_MASK 0x08
+#define STATUS_P_FAIL (1 << 3)
+
+#define STATUS_ECC_MASK 0x30
+#define STATUS_ECC_1BIT_CORRECTED (1 << 4)
+#define STATUS_ECC_ERROR (2 << 4)
+#define STATUS_ECC_RESERVED (3 << 4)
+
+
+/*ECC enable defines*/
+#define OTP_ECC_MASK 0x10
+#define OTP_ECC_OFF 0
+#define OTP_ECC_ON 1
+
+#define ECC_DISABLED
+#define ECC_IN_NAND
+#define ECC_SOFT
+
+/* block lock */
+#define BL_ALL_LOCKED 0x38
+#define BL_1_2_LOCKED 0x30
+#define BL_1_4_LOCKED 0x28
+#define BL_1_8_LOCKED 0x20
+#define BL_1_16_LOCKED 0x18
+#define BL_1_32_LOCKED 0x10
+#define BL_1_64_LOCKED 0x08
+#define BL_ALL_UNLOCKED 0
+
+struct spinand_info {
+ u8 mid;
+ u8 did;
+ char *name;
+ u64 nand_size;
+ u64 usable_size;
+
+ u32 block_size;
+ u32 block_main_size;
+ /*u32 block_spare_size; */
+ u16 block_num_per_chip;
+ u16 page_size;
+ u16 page_main_size;
+ u16 page_spare_size;
+ u16 page_num_per_block;
+ u8 block_shift;
+ u32 block_mask;
+ u8 page_shift;
+ u16 page_mask;
+
+ struct nand_ecclayout *ecclayout;
+};
+
+typedef enum {
+ FL_READY,
+ FL_READING,
+ FL_WRITING,
+ FL_ERASING,
+ FL_SYNCING,
+ FL_LOCKING,
+ FL_RESETING,
+ FL_OTPING,
+ FL_PM_SUSPENDED,
+} spinand_state_t;
+
+struct spinand_chip { /* used for multi chip */
+ spinlock_t chip_lock;
+ wait_queue_head_t wq;
+ spinand_state_t state;
+ struct spi_device *spi_nand;
+ struct spinand_info *info;
+ /*struct mtd_info *mtd; */
+
+ int (*reset) (struct spi_device *spi_nand);
+ int (*read_id) (struct spi_device *spi_nand, u8 *id);
+ int (*read_page) (struct spi_device *spi_nand,
+ struct spinand_info *info, u16 page_id, u16 offset,
+ u16 len, u8 *rbuf);
+ int (*program_page) (struct spi_device *spi_nand,
+ struct spinand_info *info, u16 page_id, u16 offset,
+ u16 len, u8 *wbuf);
+ int (*erase_block) (struct spi_device *spi_nand,
+ struct spinand_info *info, u16 block_id);
+
+ u8 *buf;
+ u8 *oobbuf; /* temp buffer */
+
+#ifdef CONFIG_MTD_SPINAND_SWECC
+ u8 ecc_calc[12];
+ u8 ecc_code[12];
+#endif
+};
+
+struct spinand_cmd {
+ u8 cmd;
+ unsigned n_addr;
+ u8 addr[3];
+ unsigned n_dummy;
+ unsigned n_tx;
+ u8 *tx_buf;
+ unsigned n_rx;
+ u8 *rx_buf;
+};
+
+extern int spinand_mtd(struct mtd_info *mtd);
+extern void spinand_mtd_release(struct mtd_info *mtd);
+
+#endif
--
1.7.1


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