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path: root/drivers/mtd/nand/spi/core.c
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Diffstat (limited to 'drivers/mtd/nand/spi/core.c')
-rw-r--r--drivers/mtd/nand/spi/core.c1235
1 files changed, 1235 insertions, 0 deletions
diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
new file mode 100644
index 0000000000..08f853ae11
--- /dev/null
+++ b/drivers/mtd/nand/spi/core.c
@@ -0,0 +1,1235 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2016-2017 Micron Technology, Inc.
+ *
+ * Authors:
+ * Peter Pan <peterpandong@micron.com>
+ * Boris Brezillon <boris.brezillon@bootlin.com>
+ */
+
+#define pr_fmt(fmt) "spi-nand: " fmt
+
+#ifndef __UBOOT__
+#include <linux/device.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/spinand.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+#else
+#include <common.h>
+#include <errno.h>
+#include <spi.h>
+#include <spi-mem.h>
+#include <linux/mtd/spinand.h>
+#endif
+
+/* SPI NAND index visible in MTD names */
+static int spi_nand_idx;
+
+static void spinand_cache_op_adjust_colum(struct spinand_device *spinand,
+ const struct nand_page_io_req *req,
+ u16 *column)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ unsigned int shift;
+
+ if (nand->memorg.planes_per_lun < 2)
+ return;
+
+ /* The plane number is passed in MSB just above the column address */
+ shift = fls(nand->memorg.pagesize);
+ *column |= req->pos.plane << shift;
+}
+
+static int spinand_read_reg_op(struct spinand_device *spinand, u8 reg, u8 *val)
+{
+ struct spi_mem_op op = SPINAND_GET_FEATURE_OP(reg,
+ spinand->scratchbuf);
+ int ret;
+
+ ret = spi_mem_exec_op(spinand->slave, &op);
+ if (ret)
+ return ret;
+
+ *val = *spinand->scratchbuf;
+ return 0;
+}
+
+static int spinand_write_reg_op(struct spinand_device *spinand, u8 reg, u8 val)
+{
+ struct spi_mem_op op = SPINAND_SET_FEATURE_OP(reg,
+ spinand->scratchbuf);
+
+ *spinand->scratchbuf = val;
+ return spi_mem_exec_op(spinand->slave, &op);
+}
+
+static int spinand_read_status(struct spinand_device *spinand, u8 *status)
+{
+ return spinand_read_reg_op(spinand, REG_STATUS, status);
+}
+
+static int spinand_get_cfg(struct spinand_device *spinand, u8 *cfg)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+
+ if (WARN_ON(spinand->cur_target < 0 ||
+ spinand->cur_target >= nand->memorg.ntargets))
+ return -EINVAL;
+
+ *cfg = spinand->cfg_cache[spinand->cur_target];
+ return 0;
+}
+
+static int spinand_set_cfg(struct spinand_device *spinand, u8 cfg)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ int ret;
+
+ if (WARN_ON(spinand->cur_target < 0 ||
+ spinand->cur_target >= nand->memorg.ntargets))
+ return -EINVAL;
+
+ if (spinand->cfg_cache[spinand->cur_target] == cfg)
+ return 0;
+
+ ret = spinand_write_reg_op(spinand, REG_CFG, cfg);
+ if (ret)
+ return ret;
+
+ spinand->cfg_cache[spinand->cur_target] = cfg;
+ return 0;
+}
+
+/**
+ * spinand_upd_cfg() - Update the configuration register
+ * @spinand: the spinand device
+ * @mask: the mask encoding the bits to update in the config reg
+ * @val: the new value to apply
+ *
+ * Update the configuration register.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+int spinand_upd_cfg(struct spinand_device *spinand, u8 mask, u8 val)
+{
+ int ret;
+ u8 cfg;
+
+ ret = spinand_get_cfg(spinand, &cfg);
+ if (ret)
+ return ret;
+
+ cfg &= ~mask;
+ cfg |= val;
+
+ return spinand_set_cfg(spinand, cfg);
+}
+
+/**
+ * spinand_select_target() - Select a specific NAND target/die
+ * @spinand: the spinand device
+ * @target: the target/die to select
+ *
+ * Select a new target/die. If chip only has one die, this function is a NOOP.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+int spinand_select_target(struct spinand_device *spinand, unsigned int target)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ int ret;
+
+ if (WARN_ON(target >= nand->memorg.ntargets))
+ return -EINVAL;
+
+ if (spinand->cur_target == target)
+ return 0;
+
+ if (nand->memorg.ntargets == 1) {
+ spinand->cur_target = target;
+ return 0;
+ }
+
+ ret = spinand->select_target(spinand, target);
+ if (ret)
+ return ret;
+
+ spinand->cur_target = target;
+ return 0;
+}
+
+static int spinand_init_cfg_cache(struct spinand_device *spinand)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ struct udevice *dev = spinand->slave->dev;
+ unsigned int target;
+ int ret;
+
+ spinand->cfg_cache = devm_kzalloc(dev,
+ sizeof(*spinand->cfg_cache) *
+ nand->memorg.ntargets,
+ GFP_KERNEL);
+ if (!spinand->cfg_cache)
+ return -ENOMEM;
+
+ for (target = 0; target < nand->memorg.ntargets; target++) {
+ ret = spinand_select_target(spinand, target);
+ if (ret)
+ return ret;
+
+ /*
+ * We use spinand_read_reg_op() instead of spinand_get_cfg()
+ * here to bypass the config cache.
+ */
+ ret = spinand_read_reg_op(spinand, REG_CFG,
+ &spinand->cfg_cache[target]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int spinand_init_quad_enable(struct spinand_device *spinand)
+{
+ bool enable = false;
+
+ if (!(spinand->flags & SPINAND_HAS_QE_BIT))
+ return 0;
+
+ if (spinand->op_templates.read_cache->data.buswidth == 4 ||
+ spinand->op_templates.write_cache->data.buswidth == 4 ||
+ spinand->op_templates.update_cache->data.buswidth == 4)
+ enable = true;
+
+ return spinand_upd_cfg(spinand, CFG_QUAD_ENABLE,
+ enable ? CFG_QUAD_ENABLE : 0);
+}
+
+static int spinand_ecc_enable(struct spinand_device *spinand,
+ bool enable)
+{
+ return spinand_upd_cfg(spinand, CFG_ECC_ENABLE,
+ enable ? CFG_ECC_ENABLE : 0);
+}
+
+static int spinand_write_enable_op(struct spinand_device *spinand)
+{
+ struct spi_mem_op op = SPINAND_WR_EN_DIS_OP(true);
+
+ return spi_mem_exec_op(spinand->slave, &op);
+}
+
+static int spinand_load_page_op(struct spinand_device *spinand,
+ const struct nand_page_io_req *req)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ unsigned int row = nanddev_pos_to_row(nand, &req->pos);
+ struct spi_mem_op op = SPINAND_PAGE_READ_OP(row);
+
+ return spi_mem_exec_op(spinand->slave, &op);
+}
+
+static int spinand_read_from_cache_op(struct spinand_device *spinand,
+ const struct nand_page_io_req *req)
+{
+ struct spi_mem_op op = *spinand->op_templates.read_cache;
+ struct nand_device *nand = spinand_to_nand(spinand);
+ struct mtd_info *mtd = nanddev_to_mtd(nand);
+ struct nand_page_io_req adjreq = *req;
+ unsigned int nbytes = 0;
+ void *buf = NULL;
+ u16 column = 0;
+ int ret;
+
+ if (req->datalen) {
+ adjreq.datalen = nanddev_page_size(nand);
+ adjreq.dataoffs = 0;
+ adjreq.databuf.in = spinand->databuf;
+ buf = spinand->databuf;
+ nbytes = adjreq.datalen;
+ }
+
+ if (req->ooblen) {
+ adjreq.ooblen = nanddev_per_page_oobsize(nand);
+ adjreq.ooboffs = 0;
+ adjreq.oobbuf.in = spinand->oobbuf;
+ nbytes += nanddev_per_page_oobsize(nand);
+ if (!buf) {
+ buf = spinand->oobbuf;
+ column = nanddev_page_size(nand);
+ }
+ }
+
+ spinand_cache_op_adjust_colum(spinand, &adjreq, &column);
+ op.addr.val = column;
+
+ /*
+ * Some controllers are limited in term of max RX data size. In this
+ * case, just repeat the READ_CACHE operation after updating the
+ * column.
+ */
+ while (nbytes) {
+ op.data.buf.in = buf;
+ op.data.nbytes = nbytes;
+ ret = spi_mem_adjust_op_size(spinand->slave, &op);
+ if (ret)
+ return ret;
+
+ ret = spi_mem_exec_op(spinand->slave, &op);
+ if (ret)
+ return ret;
+
+ buf += op.data.nbytes;
+ nbytes -= op.data.nbytes;
+ op.addr.val += op.data.nbytes;
+ }
+
+ if (req->datalen)
+ memcpy(req->databuf.in, spinand->databuf + req->dataoffs,
+ req->datalen);
+
+ if (req->ooblen) {
+ if (req->mode == MTD_OPS_AUTO_OOB)
+ mtd_ooblayout_get_databytes(mtd, req->oobbuf.in,
+ spinand->oobbuf,
+ req->ooboffs,
+ req->ooblen);
+ else
+ memcpy(req->oobbuf.in, spinand->oobbuf + req->ooboffs,
+ req->ooblen);
+ }
+
+ return 0;
+}
+
+static int spinand_write_to_cache_op(struct spinand_device *spinand,
+ const struct nand_page_io_req *req)
+{
+ struct spi_mem_op op = *spinand->op_templates.write_cache;
+ struct nand_device *nand = spinand_to_nand(spinand);
+ struct mtd_info *mtd = nanddev_to_mtd(nand);
+ struct nand_page_io_req adjreq = *req;
+ unsigned int nbytes = 0;
+ void *buf = NULL;
+ u16 column = 0;
+ int ret;
+
+ memset(spinand->databuf, 0xff,
+ nanddev_page_size(nand) +
+ nanddev_per_page_oobsize(nand));
+
+ if (req->datalen) {
+ memcpy(spinand->databuf + req->dataoffs, req->databuf.out,
+ req->datalen);
+ adjreq.dataoffs = 0;
+ adjreq.datalen = nanddev_page_size(nand);
+ adjreq.databuf.out = spinand->databuf;
+ nbytes = adjreq.datalen;
+ buf = spinand->databuf;
+ }
+
+ if (req->ooblen) {
+ if (req->mode == MTD_OPS_AUTO_OOB)
+ mtd_ooblayout_set_databytes(mtd, req->oobbuf.out,
+ spinand->oobbuf,
+ req->ooboffs,
+ req->ooblen);
+ else
+ memcpy(spinand->oobbuf + req->ooboffs, req->oobbuf.out,
+ req->ooblen);
+
+ adjreq.ooblen = nanddev_per_page_oobsize(nand);
+ adjreq.ooboffs = 0;
+ nbytes += nanddev_per_page_oobsize(nand);
+ if (!buf) {
+ buf = spinand->oobbuf;
+ column = nanddev_page_size(nand);
+ }
+ }
+
+ spinand_cache_op_adjust_colum(spinand, &adjreq, &column);
+
+ op = *spinand->op_templates.write_cache;
+ op.addr.val = column;
+
+ /*
+ * Some controllers are limited in term of max TX data size. In this
+ * case, split the operation into one LOAD CACHE and one or more
+ * LOAD RANDOM CACHE.
+ */
+ while (nbytes) {
+ op.data.buf.out = buf;
+ op.data.nbytes = nbytes;
+
+ ret = spi_mem_adjust_op_size(spinand->slave, &op);
+ if (ret)
+ return ret;
+
+ ret = spi_mem_exec_op(spinand->slave, &op);
+ if (ret)
+ return ret;
+
+ buf += op.data.nbytes;
+ nbytes -= op.data.nbytes;
+ op.addr.val += op.data.nbytes;
+
+ /*
+ * We need to use the RANDOM LOAD CACHE operation if there's
+ * more than one iteration, because the LOAD operation resets
+ * the cache to 0xff.
+ */
+ if (nbytes) {
+ column = op.addr.val;
+ op = *spinand->op_templates.update_cache;
+ op.addr.val = column;
+ }
+ }
+
+ return 0;
+}
+
+static int spinand_program_op(struct spinand_device *spinand,
+ const struct nand_page_io_req *req)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ unsigned int row = nanddev_pos_to_row(nand, &req->pos);
+ struct spi_mem_op op = SPINAND_PROG_EXEC_OP(row);
+
+ return spi_mem_exec_op(spinand->slave, &op);
+}
+
+static int spinand_erase_op(struct spinand_device *spinand,
+ const struct nand_pos *pos)
+{
+ struct nand_device *nand = &spinand->base;
+ unsigned int row = nanddev_pos_to_row(nand, pos);
+ struct spi_mem_op op = SPINAND_BLK_ERASE_OP(row);
+
+ return spi_mem_exec_op(spinand->slave, &op);
+}
+
+static int spinand_wait(struct spinand_device *spinand, u8 *s)
+{
+ unsigned long start, stop;
+ u8 status;
+ int ret;
+
+ start = get_timer(0);
+ stop = 400;
+ do {
+ ret = spinand_read_status(spinand, &status);
+ if (ret)
+ return ret;
+
+ if (!(status & STATUS_BUSY))
+ goto out;
+ } while (get_timer(start) < stop);
+
+ /*
+ * Extra read, just in case the STATUS_READY bit has changed
+ * since our last check
+ */
+ ret = spinand_read_status(spinand, &status);
+ if (ret)
+ return ret;
+
+out:
+ if (s)
+ *s = status;
+
+ return status & STATUS_BUSY ? -ETIMEDOUT : 0;
+}
+
+static int spinand_read_id_op(struct spinand_device *spinand, u8 *buf)
+{
+ struct spi_mem_op op = SPINAND_READID_OP(0, spinand->scratchbuf,
+ SPINAND_MAX_ID_LEN);
+ int ret;
+
+ ret = spi_mem_exec_op(spinand->slave, &op);
+ if (!ret)
+ memcpy(buf, spinand->scratchbuf, SPINAND_MAX_ID_LEN);
+
+ return ret;
+}
+
+static int spinand_reset_op(struct spinand_device *spinand)
+{
+ struct spi_mem_op op = SPINAND_RESET_OP;
+ int ret;
+
+ ret = spi_mem_exec_op(spinand->slave, &op);
+ if (ret)
+ return ret;
+
+ return spinand_wait(spinand, NULL);
+}
+
+static int spinand_lock_block(struct spinand_device *spinand, u8 lock)
+{
+ return spinand_write_reg_op(spinand, REG_BLOCK_LOCK, lock);
+}
+
+static int spinand_check_ecc_status(struct spinand_device *spinand, u8 status)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+
+ if (spinand->eccinfo.get_status)
+ return spinand->eccinfo.get_status(spinand, status);
+
+ switch (status & STATUS_ECC_MASK) {
+ case STATUS_ECC_NO_BITFLIPS:
+ return 0;
+
+ case STATUS_ECC_HAS_BITFLIPS:
+ /*
+ * We have no way to know exactly how many bitflips have been
+ * fixed, so let's return the maximum possible value so that
+ * wear-leveling layers move the data immediately.
+ */
+ return nand->eccreq.strength;
+
+ case STATUS_ECC_UNCOR_ERROR:
+ return -EBADMSG;
+
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static int spinand_read_page(struct spinand_device *spinand,
+ const struct nand_page_io_req *req,
+ bool ecc_enabled)
+{
+ u8 status;
+ int ret;
+
+ ret = spinand_load_page_op(spinand, req);
+ if (ret)
+ return ret;
+
+ ret = spinand_wait(spinand, &status);
+ if (ret < 0)
+ return ret;
+
+ ret = spinand_read_from_cache_op(spinand, req);
+ if (ret)
+ return ret;
+
+ if (!ecc_enabled)
+ return 0;
+
+ return spinand_check_ecc_status(spinand, status);
+}
+
+static int spinand_write_page(struct spinand_device *spinand,
+ const struct nand_page_io_req *req)
+{
+ u8 status;
+ int ret;
+
+ ret = spinand_write_enable_op(spinand);
+ if (ret)
+ return ret;
+
+ ret = spinand_write_to_cache_op(spinand, req);
+ if (ret)
+ return ret;
+
+ ret = spinand_program_op(spinand, req);
+ if (ret)
+ return ret;
+
+ ret = spinand_wait(spinand, &status);
+ if (!ret && (status & STATUS_PROG_FAILED))
+ ret = -EIO;
+
+ return ret;
+}
+
+static int spinand_mtd_read(struct mtd_info *mtd, loff_t from,
+ struct mtd_oob_ops *ops)
+{
+ struct spinand_device *spinand = mtd_to_spinand(mtd);
+ struct nand_device *nand = mtd_to_nanddev(mtd);
+ unsigned int max_bitflips = 0;
+ struct nand_io_iter iter;
+ bool enable_ecc = false;
+ bool ecc_failed = false;
+ int ret = 0;
+
+ if (ops->mode != MTD_OPS_RAW && spinand->eccinfo.ooblayout)
+ enable_ecc = true;
+
+#ifndef __UBOOT__
+ mutex_lock(&spinand->lock);
+#endif
+
+ nanddev_io_for_each_page(nand, from, ops, &iter) {
+ ret = spinand_select_target(spinand, iter.req.pos.target);
+ if (ret)
+ break;
+
+ ret = spinand_ecc_enable(spinand, enable_ecc);
+ if (ret)
+ break;
+
+ ret = spinand_read_page(spinand, &iter.req, enable_ecc);
+ if (ret < 0 && ret != -EBADMSG)
+ break;
+
+ if (ret == -EBADMSG) {
+ ecc_failed = true;
+ mtd->ecc_stats.failed++;
+ ret = 0;
+ } else {
+ mtd->ecc_stats.corrected += ret;
+ max_bitflips = max_t(unsigned int, max_bitflips, ret);
+ }
+
+ ops->retlen += iter.req.datalen;
+ ops->oobretlen += iter.req.ooblen;
+ }
+
+#ifndef __UBOOT__
+ mutex_unlock(&spinand->lock);
+#endif
+ if (ecc_failed && !ret)
+ ret = -EBADMSG;
+
+ return ret ? ret : max_bitflips;
+}
+
+static int spinand_mtd_write(struct mtd_info *mtd, loff_t to,
+ struct mtd_oob_ops *ops)
+{
+ struct spinand_device *spinand = mtd_to_spinand(mtd);
+ struct nand_device *nand = mtd_to_nanddev(mtd);
+ struct nand_io_iter iter;
+ bool enable_ecc = false;
+ int ret = 0;
+
+ if (ops->mode != MTD_OPS_RAW && mtd->ooblayout)
+ enable_ecc = true;
+
+#ifndef __UBOOT__
+ mutex_lock(&spinand->lock);
+#endif
+
+ nanddev_io_for_each_page(nand, to, ops, &iter) {
+ ret = spinand_select_target(spinand, iter.req.pos.target);
+ if (ret)
+ break;
+
+ ret = spinand_ecc_enable(spinand, enable_ecc);
+ if (ret)
+ break;
+
+ ret = spinand_write_page(spinand, &iter.req);
+ if (ret)
+ break;
+
+ ops->retlen += iter.req.datalen;
+ ops->oobretlen += iter.req.ooblen;
+ }
+
+#ifndef __UBOOT__
+ mutex_unlock(&spinand->lock);
+#endif
+
+ return ret;
+}
+
+static bool spinand_isbad(struct nand_device *nand, const struct nand_pos *pos)
+{
+ struct spinand_device *spinand = nand_to_spinand(nand);
+ struct nand_page_io_req req = {
+ .pos = *pos,
+ .ooblen = 2,
+ .ooboffs = 0,
+ .oobbuf.in = spinand->oobbuf,
+ .mode = MTD_OPS_RAW,
+ };
+ int ret;
+
+ memset(spinand->oobbuf, 0, 2);
+ ret = spinand_select_target(spinand, pos->target);
+ if (ret)
+ return ret;
+
+ ret = spinand_read_page(spinand, &req, false);
+ if (ret)
+ return ret;
+
+ if (spinand->oobbuf[0] != 0xff || spinand->oobbuf[1] != 0xff)
+ return true;
+
+ return false;
+}
+
+static int spinand_mtd_block_isbad(struct mtd_info *mtd, loff_t offs)
+{
+ struct nand_device *nand = mtd_to_nanddev(mtd);
+#ifndef __UBOOT__
+ struct spinand_device *spinand = nand_to_spinand(nand);
+#endif
+ struct nand_pos pos;
+ int ret;
+
+ nanddev_offs_to_pos(nand, offs, &pos);
+#ifndef __UBOOT__
+ mutex_lock(&spinand->lock);
+#endif
+ ret = nanddev_isbad(nand, &pos);
+#ifndef __UBOOT__
+ mutex_unlock(&spinand->lock);
+#endif
+ return ret;
+}
+
+static int spinand_markbad(struct nand_device *nand, const struct nand_pos *pos)
+{
+ struct spinand_device *spinand = nand_to_spinand(nand);
+ struct nand_page_io_req req = {
+ .pos = *pos,
+ .ooboffs = 0,
+ .ooblen = 2,
+ .oobbuf.out = spinand->oobbuf,
+ };
+ int ret;
+
+ /* Erase block before marking it bad. */
+ ret = spinand_select_target(spinand, pos->target);
+ if (ret)
+ return ret;
+
+ ret = spinand_write_enable_op(spinand);
+ if (ret)
+ return ret;
+
+ ret = spinand_erase_op(spinand, pos);
+ if (ret)
+ return ret;
+
+ memset(spinand->oobbuf, 0, 2);
+ return spinand_write_page(spinand, &req);
+}
+
+static int spinand_mtd_block_markbad(struct mtd_info *mtd, loff_t offs)
+{
+ struct nand_device *nand = mtd_to_nanddev(mtd);
+#ifndef __UBOOT__
+ struct spinand_device *spinand = nand_to_spinand(nand);
+#endif
+ struct nand_pos pos;
+ int ret;
+
+ nanddev_offs_to_pos(nand, offs, &pos);
+#ifndef __UBOOT__
+ mutex_lock(&spinand->lock);
+#endif
+ ret = nanddev_markbad(nand, &pos);
+#ifndef __UBOOT__
+ mutex_unlock(&spinand->lock);
+#endif
+ return ret;
+}
+
+static int spinand_erase(struct nand_device *nand, const struct nand_pos *pos)
+{
+ struct spinand_device *spinand = nand_to_spinand(nand);
+ u8 status;
+ int ret;
+
+ ret = spinand_select_target(spinand, pos->target);
+ if (ret)
+ return ret;
+
+ ret = spinand_write_enable_op(spinand);
+ if (ret)
+ return ret;
+
+ ret = spinand_erase_op(spinand, pos);
+ if (ret)
+ return ret;
+
+ ret = spinand_wait(spinand, &status);
+ if (!ret && (status & STATUS_ERASE_FAILED))
+ ret = -EIO;
+
+ return ret;
+}
+
+static int spinand_mtd_erase(struct mtd_info *mtd,
+ struct erase_info *einfo)
+{
+#ifndef __UBOOT__
+ struct spinand_device *spinand = mtd_to_spinand(mtd);
+#endif
+ int ret;
+
+#ifndef __UBOOT__
+ mutex_lock(&spinand->lock);
+#endif
+ ret = nanddev_mtd_erase(mtd, einfo);
+#ifndef __UBOOT__
+ mutex_unlock(&spinand->lock);
+#endif
+
+ return ret;
+}
+
+static int spinand_mtd_block_isreserved(struct mtd_info *mtd, loff_t offs)
+{
+#ifndef __UBOOT__
+ struct spinand_device *spinand = mtd_to_spinand(mtd);
+#endif
+ struct nand_device *nand = mtd_to_nanddev(mtd);
+ struct nand_pos pos;
+ int ret;
+
+ nanddev_offs_to_pos(nand, offs, &pos);
+#ifndef __UBOOT__
+ mutex_lock(&spinand->lock);
+#endif
+ ret = nanddev_isreserved(nand, &pos);
+#ifndef __UBOOT__
+ mutex_unlock(&spinand->lock);
+#endif
+
+ return ret;
+}
+
+const struct spi_mem_op *
+spinand_find_supported_op(struct spinand_device *spinand,
+ const struct spi_mem_op *ops,
+ unsigned int nops)
+{
+ unsigned int i;
+
+ for (i = 0; i < nops; i++) {
+ if (spi_mem_supports_op(spinand->slave, &ops[i]))
+ return &ops[i];
+ }
+
+ return NULL;
+}
+
+static const struct nand_ops spinand_ops = {
+ .erase = spinand_erase,
+ .markbad = spinand_markbad,
+ .isbad = spinand_isbad,
+};
+
+static int spinand_manufacturer_detect(struct spinand_device *spinand)
+{
+ return -ENOTSUPP;
+}
+
+static int spinand_manufacturer_init(struct spinand_device *spinand)
+{
+ if (spinand->manufacturer->ops->init)
+ return spinand->manufacturer->ops->init(spinand);
+
+ return 0;
+}
+
+static void spinand_manufacturer_cleanup(struct spinand_device *spinand)
+{
+ /* Release manufacturer private data */
+ if (spinand->manufacturer->ops->cleanup)
+ return spinand->manufacturer->ops->cleanup(spinand);
+}
+
+static const struct spi_mem_op *
+spinand_select_op_variant(struct spinand_device *spinand,
+ const struct spinand_op_variants *variants)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ unsigned int i;
+
+ for (i = 0; i < variants->nops; i++) {
+ struct spi_mem_op op = variants->ops[i];
+ unsigned int nbytes;
+ int ret;
+
+ nbytes = nanddev_per_page_oobsize(nand) +
+ nanddev_page_size(nand);
+
+ while (nbytes) {
+ op.data.nbytes = nbytes;
+ ret = spi_mem_adjust_op_size(spinand->slave, &op);
+ if (ret)
+ break;
+
+ if (!spi_mem_supports_op(spinand->slave, &op))
+ break;
+
+ nbytes -= op.data.nbytes;
+ }
+
+ if (!nbytes)
+ return &variants->ops[i];
+ }
+
+ return NULL;
+}
+
+/**
+ * spinand_match_and_init() - Try to find a match between a device ID and an
+ * entry in a spinand_info table
+ * @spinand: SPI NAND object
+ * @table: SPI NAND device description table
+ * @table_size: size of the device description table
+ *
+ * Should be used by SPI NAND manufacturer drivers when they want to find a
+ * match between a device ID retrieved through the READ_ID command and an
+ * entry in the SPI NAND description table. If a match is found, the spinand
+ * object will be initialized with information provided by the matching
+ * spinand_info entry.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+int spinand_match_and_init(struct spinand_device *spinand,
+ const struct spinand_info *table,
+ unsigned int table_size, u8 devid)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ unsigned int i;
+
+ for (i = 0; i < table_size; i++) {
+ const struct spinand_info *info = &table[i];
+ const struct spi_mem_op *op;
+
+ if (devid != info->devid)
+ continue;
+
+ nand->memorg = table[i].memorg;
+ nand->eccreq = table[i].eccreq;
+ spinand->eccinfo = table[i].eccinfo;
+ spinand->flags = table[i].flags;
+ spinand->select_target = table[i].select_target;
+
+ op = spinand_select_op_variant(spinand,
+ info->op_variants.read_cache);
+ if (!op)
+ return -ENOTSUPP;
+
+ spinand->op_templates.read_cache = op;
+
+ op = spinand_select_op_variant(spinand,
+ info->op_variants.write_cache);
+ if (!op)
+ return -ENOTSUPP;
+
+ spinand->op_templates.write_cache = op;
+
+ op = spinand_select_op_variant(spinand,
+ info->op_variants.update_cache);
+ spinand->op_templates.update_cache = op;
+
+ return 0;
+ }
+
+ return -ENOTSUPP;
+}
+
+static int spinand_detect(struct spinand_device *spinand)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+ int ret;
+
+ ret = spinand_reset_op(spinand);
+ if (ret)
+ return ret;
+
+ ret = spinand_read_id_op(spinand, spinand->id.data);
+ if (ret)
+ return ret;
+
+ spinand->id.len = SPINAND_MAX_ID_LEN;
+
+ ret = spinand_manufacturer_detect(spinand);
+ if (ret) {
+ dev_err(dev, "unknown raw ID %*phN\n", SPINAND_MAX_ID_LEN,
+ spinand->id.data);
+ return ret;
+ }
+
+ if (nand->memorg.ntargets > 1 && !spinand->select_target) {
+ dev_err(dev,
+ "SPI NANDs with more than one die must implement ->select_target()\n");
+ return -EINVAL;
+ }
+
+ dev_info(spinand->slave->dev,
+ "%s SPI NAND was found.\n", spinand->manufacturer->name);
+ dev_info(spinand->slave->dev,
+ "%llu MiB, block size: %zu KiB, page size: %zu, OOB size: %u\n",
+ nanddev_size(nand) >> 20, nanddev_eraseblock_size(nand) >> 10,
+ nanddev_page_size(nand), nanddev_per_page_oobsize(nand));
+
+ return 0;
+}
+
+static int spinand_noecc_ooblayout_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *region)
+{
+ return -ERANGE;
+}
+
+static int spinand_noecc_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 spinand_noecc_ooblayout = {
+ .ecc = spinand_noecc_ooblayout_ecc,
+ .free = spinand_noecc_ooblayout_free,
+};
+
+static int spinand_init(struct spinand_device *spinand)
+{
+ struct mtd_info *mtd = spinand_to_mtd(spinand);
+ struct nand_device *nand = mtd_to_nanddev(mtd);
+ int ret, i;
+
+ /*
+ * We need a scratch buffer because the spi_mem interface requires that
+ * buf passed in spi_mem_op->data.buf be DMA-able.
+ */
+ spinand->scratchbuf = kzalloc(SPINAND_MAX_ID_LEN, GFP_KERNEL);
+ if (!spinand->scratchbuf)
+ return -ENOMEM;
+
+ ret = spinand_detect(spinand);
+ if (ret)
+ goto err_free_bufs;
+
+ /*
+ * Use kzalloc() instead of devm_kzalloc() here, because some drivers
+ * may use this buffer for DMA access.
+ * Memory allocated by devm_ does not guarantee DMA-safe alignment.
+ */
+ spinand->databuf = kzalloc(nanddev_page_size(nand) +
+ nanddev_per_page_oobsize(nand),
+ GFP_KERNEL);
+ if (!spinand->databuf) {
+ ret = -ENOMEM;
+ goto err_free_bufs;
+ }
+
+ spinand->oobbuf = spinand->databuf + nanddev_page_size(nand);
+
+ ret = spinand_init_cfg_cache(spinand);
+ if (ret)
+ goto err_free_bufs;
+
+ ret = spinand_init_quad_enable(spinand);
+ if (ret)
+ goto err_free_bufs;
+
+ ret = spinand_upd_cfg(spinand, CFG_OTP_ENABLE, 0);
+ if (ret)
+ goto err_free_bufs;
+
+ ret = spinand_manufacturer_init(spinand);
+ if (ret) {
+ dev_err(dev,
+ "Failed to initialize the SPI NAND chip (err = %d)\n",
+ ret);
+ goto err_free_bufs;
+ }
+
+ /* After power up, all blocks are locked, so unlock them here. */
+ for (i = 0; i < nand->memorg.ntargets; i++) {
+ ret = spinand_select_target(spinand, i);
+ if (ret)
+ goto err_free_bufs;
+
+ ret = spinand_lock_block(spinand, BL_ALL_UNLOCKED);
+ if (ret)
+ goto err_free_bufs;
+ }
+
+ ret = nanddev_init(nand, &spinand_ops, THIS_MODULE);
+ if (ret)
+ goto err_manuf_cleanup;
+
+ /*
+ * Right now, we don't support ECC, so let the whole oob
+ * area is available for user.
+ */
+ mtd->_read_oob = spinand_mtd_read;
+ mtd->_write_oob = spinand_mtd_write;
+ mtd->_block_isbad = spinand_mtd_block_isbad;
+ mtd->_block_markbad = spinand_mtd_block_markbad;
+ mtd->_block_isreserved = spinand_mtd_block_isreserved;
+ mtd->_erase = spinand_mtd_erase;
+
+ if (spinand->eccinfo.ooblayout)
+ mtd_set_ooblayout(mtd, spinand->eccinfo.ooblayout);
+ else
+ mtd_set_ooblayout(mtd, &spinand_noecc_ooblayout);
+
+ ret = mtd_ooblayout_count_freebytes(mtd);
+ if (ret < 0)
+ goto err_cleanup_nanddev;
+
+ mtd->oobavail = ret;
+
+ return 0;
+
+err_cleanup_nanddev:
+ nanddev_cleanup(nand);
+
+err_manuf_cleanup:
+ spinand_manufacturer_cleanup(spinand);
+
+err_free_bufs:
+ kfree(spinand->databuf);
+ kfree(spinand->scratchbuf);
+ return ret;
+}
+
+static void spinand_cleanup(struct spinand_device *spinand)
+{
+ struct nand_device *nand = spinand_to_nand(spinand);
+
+ nanddev_cleanup(nand);
+ spinand_manufacturer_cleanup(spinand);
+ kfree(spinand->databuf);
+ kfree(spinand->scratchbuf);
+}
+
+static int spinand_probe(struct udevice *dev)
+{
+ struct spinand_device *spinand = dev_get_priv(dev);
+ struct spi_slave *slave = dev_get_parent_priv(dev);
+ struct mtd_info *mtd = dev_get_uclass_priv(dev);
+ struct nand_device *nand = spinand_to_nand(spinand);
+ int ret;
+
+#ifndef __UBOOT__
+ spinand = devm_kzalloc(&mem->spi->dev, sizeof(*spinand),
+ GFP_KERNEL);
+ if (!spinand)
+ return -ENOMEM;
+
+ spinand->spimem = mem;
+ spi_mem_set_drvdata(mem, spinand);
+ spinand_set_of_node(spinand, mem->spi->dev.of_node);
+ mutex_init(&spinand->lock);
+
+ mtd = spinand_to_mtd(spinand);
+ mtd->dev.parent = &mem->spi->dev;
+#else
+ nand->mtd = mtd;
+ mtd->priv = nand;
+ mtd->dev = dev;
+ mtd->name = malloc(20);
+ if (!mtd->name)
+ return -ENOMEM;
+ sprintf(mtd->name, "spi-nand%d", spi_nand_idx++);
+ spinand->slave = slave;
+ spinand_set_of_node(spinand, dev->node.np);
+#endif
+
+ ret = spinand_init(spinand);
+ if (ret)
+ return ret;
+
+#ifndef __UBOOT__
+ ret = mtd_device_register(mtd, NULL, 0);
+#else
+ ret = add_mtd_device(mtd);
+#endif
+ if (ret)
+ goto err_spinand_cleanup;
+
+ return 0;
+
+err_spinand_cleanup:
+ spinand_cleanup(spinand);
+
+ return ret;
+}
+
+#ifndef __UBOOT__
+static int spinand_remove(struct udevice *slave)
+{
+ struct spinand_device *spinand;
+ struct mtd_info *mtd;
+ int ret;
+
+ spinand = spi_mem_get_drvdata(slave);
+ mtd = spinand_to_mtd(spinand);
+ free(mtd->name);
+
+ ret = mtd_device_unregister(mtd);
+ if (ret)
+ return ret;
+
+ spinand_cleanup(spinand);
+
+ return 0;
+}
+
+static const struct spi_device_id spinand_ids[] = {
+ { .name = "spi-nand" },
+ { /* sentinel */ },
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id spinand_of_ids[] = {
+ { .compatible = "spi-nand" },
+ { /* sentinel */ },
+};
+#endif
+
+static struct spi_mem_driver spinand_drv = {
+ .spidrv = {
+ .id_table = spinand_ids,
+ .driver = {
+ .name = "spi-nand",
+ .of_match_table = of_match_ptr(spinand_of_ids),
+ },
+ },
+ .probe = spinand_probe,
+ .remove = spinand_remove,
+};
+module_spi_mem_driver(spinand_drv);
+
+MODULE_DESCRIPTION("SPI NAND framework");
+MODULE_AUTHOR("Peter Pan<peterpandong@micron.com>");
+MODULE_LICENSE("GPL v2");
+#endif /* __UBOOT__ */
+
+static const struct udevice_id spinand_ids[] = {
+ { .compatible = "spi-nand" },
+ { /* sentinel */ },
+};
+
+U_BOOT_DRIVER(spinand) = {
+ .name = "spi_nand",
+ .id = UCLASS_MTD,
+ .of_match = spinand_ids,
+ .priv_auto_alloc_size = sizeof(struct spinand_device),
+ .probe = spinand_probe,
+};