[PATCH v2 0/2] Convert FSMC NAND controller driver to ->exec_op()

[PATCH v2 0/2] Convert FSMC NAND controller driver to ->exec_op()

[Miquel Raynal]

Hello,

Now that the ->exec_op() interface has been merged in the NAND core,
convert the FSMC NAND controller driver to it.

A previous step involves getting rid of ->IO_ADDR_[R|W] across the
driver, which is almost entirely done in the first patch. Because the
driver still uses at that point the default implementations of
->read/write_byte/word(), some references are still present but are
removed as soon as the driver is moved to ->exec_op(), when this
dependency disappears.

Best regards,
Miquèl


Changes since v1:
=================

- Forgot about the NAND unique ID for now, this will need a deeper
  rework of the MTD stack and is very (ONFI-)NAND-specific.
- Split the migration of FSMC driver to ->exec_op() into two patches,
  one to get rid of ->IO_ADDR_[R|W], the other to implement ->exec_op()
  and ->select_chip() which is also needed.
- Got rid of the additional ->regs entry in the FSMC structure, using
  the existing entry ->regs_va instead.


Miquel Raynal (2):
  mtd: nand: fsmc: get rid of IO_ADDR_[R|W]
  mtd: nand: fsmc: use ->exec_op()

 drivers/mtd/nand/fsmc_nand.c | 242 ++++++++++++++++++++++++-------------------
 1 file changed, 137 insertions(+), 105 deletions(-)

-- 
2.14.1

[PATCH v2 1/2] mtd: nand: fsmc: get rid of IO_ADDR_[R|W]

[Miquel Raynal]

Remove the use of IO_ADDR_[R|W] in the fsmc_nand driver. Instead, use a
pointer to the control registers to avoid doing several arithmetic
operations (including a multiplication) each time a control register is
read or written.

All references to IO_ADDR_[R|W] are not entirely removed from the driver
as, at this time, these values are needed by the NAND core in the
default ->read/write_byte/word() hooks. These references will be
entirely removed when switching to ->exec_op(), that does not make use
of these hooks anymore.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---

Note: I know that checkpatch.pl complains about the following line but I
decided not to fix it because it was already like that before this
patch, the line is not as easy to split as it looks and it does not
enhance the readability.

    WARNING: line over 80 characters
    #287: FILE: drivers/mtd/nand/fsmc_nand.c:929:
    +		pid |= (readl(base + resource_size(res) - 0x20 + 4 * i) & 255) << (i * 8);

 drivers/mtd/nand/fsmc_nand.c | 96 ++++++++++++++++++--------------------------
 1 file changed, 40 insertions(+), 56 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index b44e5c6545e0..1454d9bf1e49 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -103,10 +103,6 @@
 #define ECC3			0x1C
 #define FSMC_NAND_BANK_SZ	0x20
 
-#define FSMC_NAND_REG(base, bank, reg)		(base + FSMC_NOR_REG_SIZE + \
-						(FSMC_NAND_BANK_SZ * (bank)) + \
-						reg)
-
 #define FSMC_BUSY_WAIT_TIMEOUT	(1 * HZ)
 
 struct fsmc_nand_timings {
@@ -143,7 +139,7 @@ enum access_mode {
  * @data_va:		NAND port for Data.
  * @cmd_va:		NAND port for Command.
  * @addr_va:		NAND port for Address.
- * @regs_va:		FSMC regs base address.
+ * @regs_va:		Registers base address for a given bank.
  */
 struct fsmc_nand_data {
 	u32			pid;
@@ -265,8 +261,6 @@ static void fsmc_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	struct nand_chip *this = mtd_to_nand(mtd);
 	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-	void __iomem *regs = host->regs_va;
-	unsigned int bank = host->bank;
 
 	if (ctrl & NAND_CTRL_CHANGE) {
 		u32 pc;
@@ -282,12 +276,12 @@ static void fsmc_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 			this->IO_ADDR_W = host->data_va;
 		}
 
-		pc = readl(FSMC_NAND_REG(regs, bank, PC));
+		pc = readl(host->regs_va + PC);
 		if (ctrl & NAND_NCE)
 			pc |= FSMC_ENABLE;
 		else
 			pc &= ~FSMC_ENABLE;
-		writel_relaxed(pc, FSMC_NAND_REG(regs, bank, PC));
+		writel_relaxed(pc, host->regs_va + PC);
 	}
 
 	mb();
@@ -307,8 +301,6 @@ static void fsmc_nand_setup(struct fsmc_nand_data *host,
 {
 	uint32_t value = FSMC_DEVTYPE_NAND | FSMC_ENABLE | FSMC_WAITON;
 	uint32_t tclr, tar, thiz, thold, twait, tset;
-	unsigned int bank = host->bank;
-	void __iomem *regs = host->regs_va;
 
 	tclr = (tims->tclr & FSMC_TCLR_MASK) << FSMC_TCLR_SHIFT;
 	tar = (tims->tar & FSMC_TAR_MASK) << FSMC_TAR_SHIFT;
@@ -318,18 +310,14 @@ static void fsmc_nand_setup(struct fsmc_nand_data *host,
 	tset = (tims->tset & FSMC_TSET_MASK) << FSMC_TSET_SHIFT;
 
 	if (host->nand.options & NAND_BUSWIDTH_16)
-		writel_relaxed(value | FSMC_DEVWID_16,
-				FSMC_NAND_REG(regs, bank, PC));
+		writel_relaxed(value | FSMC_DEVWID_16, host->regs_va + PC);
 	else
-		writel_relaxed(value | FSMC_DEVWID_8,
-				FSMC_NAND_REG(regs, bank, PC));
+		writel_relaxed(value | FSMC_DEVWID_8, host->regs_va + PC);
 
-	writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) | tclr | tar,
-			FSMC_NAND_REG(regs, bank, PC));
-	writel_relaxed(thiz | thold | twait | tset,
-			FSMC_NAND_REG(regs, bank, COMM));
-	writel_relaxed(thiz | thold | twait | tset,
-			FSMC_NAND_REG(regs, bank, ATTRIB));
+	writel_relaxed(readl(host->regs_va + PC) | tclr | tar,
+		       host->regs_va + PC);
+	writel_relaxed(thiz | thold | twait | tset, host->regs_va + COMM);
+	writel_relaxed(thiz | thold | twait | tset, host->regs_va + ATTRIB);
 }
 
 static int fsmc_calc_timings(struct fsmc_nand_data *host,
@@ -419,15 +407,13 @@ static int fsmc_setup_data_interface(struct mtd_info *mtd, int csline,
 static void fsmc_enable_hwecc(struct mtd_info *mtd, int mode)
 {
 	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-	void __iomem *regs = host->regs_va;
-	uint32_t bank = host->bank;
 
-	writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) & ~FSMC_ECCPLEN_256,
-			FSMC_NAND_REG(regs, bank, PC));
-	writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) & ~FSMC_ECCEN,
-			FSMC_NAND_REG(regs, bank, PC));
-	writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) | FSMC_ECCEN,
-			FSMC_NAND_REG(regs, bank, PC));
+	writel_relaxed(readl(host->regs_va + PC) & ~FSMC_ECCPLEN_256,
+		       host->regs_va + PC);
+	writel_relaxed(readl(host->regs_va + PC) & ~FSMC_ECCEN,
+		       host->regs_va + PC);
+	writel_relaxed(readl(host->regs_va + PC) | FSMC_ECCEN,
+		       host->regs_va + PC);
 }
 
 /*
@@ -439,13 +425,11 @@ static int fsmc_read_hwecc_ecc4(struct mtd_info *mtd, const uint8_t *data,
 				uint8_t *ecc)
 {
 	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-	void __iomem *regs = host->regs_va;
-	uint32_t bank = host->bank;
 	uint32_t ecc_tmp;
 	unsigned long deadline = jiffies + FSMC_BUSY_WAIT_TIMEOUT;
 
 	do {
-		if (readl_relaxed(FSMC_NAND_REG(regs, bank, STS)) & FSMC_CODE_RDY)
+		if (readl_relaxed(host->regs_va + STS) & FSMC_CODE_RDY)
 			break;
 		else
 			cond_resched();
@@ -456,25 +440,25 @@ static int fsmc_read_hwecc_ecc4(struct mtd_info *mtd, const uint8_t *data,
 		return -ETIMEDOUT;
 	}
 
-	ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC1));
+	ecc_tmp = readl_relaxed(host->regs_va + ECC1);
 	ecc[0] = (uint8_t) (ecc_tmp >> 0);
 	ecc[1] = (uint8_t) (ecc_tmp >> 8);
 	ecc[2] = (uint8_t) (ecc_tmp >> 16);
 	ecc[3] = (uint8_t) (ecc_tmp >> 24);
 
-	ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC2));
+	ecc_tmp = readl_relaxed(host->regs_va + ECC2);
 	ecc[4] = (uint8_t) (ecc_tmp >> 0);
 	ecc[5] = (uint8_t) (ecc_tmp >> 8);
 	ecc[6] = (uint8_t) (ecc_tmp >> 16);
 	ecc[7] = (uint8_t) (ecc_tmp >> 24);
 
-	ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC3));
+	ecc_tmp = readl_relaxed(host->regs_va + ECC3);
 	ecc[8] = (uint8_t) (ecc_tmp >> 0);
 	ecc[9] = (uint8_t) (ecc_tmp >> 8);
 	ecc[10] = (uint8_t) (ecc_tmp >> 16);
 	ecc[11] = (uint8_t) (ecc_tmp >> 24);
 
-	ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, STS));
+	ecc_tmp = readl_relaxed(host->regs_va + STS);
 	ecc[12] = (uint8_t) (ecc_tmp >> 16);
 
 	return 0;
@@ -489,11 +473,9 @@ static int fsmc_read_hwecc_ecc1(struct mtd_info *mtd, const uint8_t *data,
 				uint8_t *ecc)
 {
 	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-	void __iomem *regs = host->regs_va;
-	uint32_t bank = host->bank;
 	uint32_t ecc_tmp;
 
-	ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC1));
+	ecc_tmp = readl_relaxed(host->regs_va + ECC1);
 	ecc[0] = (uint8_t) (ecc_tmp >> 0);
 	ecc[1] = (uint8_t) (ecc_tmp >> 8);
 	ecc[2] = (uint8_t) (ecc_tmp >> 16);
@@ -598,18 +580,18 @@ static int dma_xfer(struct fsmc_nand_data *host, void *buffer, int len,
  */
 static void fsmc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 {
+	struct fsmc_nand_data *host  = mtd_to_fsmc(mtd);
 	int i;
-	struct nand_chip *chip = mtd_to_nand(mtd);
 
 	if (IS_ALIGNED((uint32_t)buf, sizeof(uint32_t)) &&
 			IS_ALIGNED(len, sizeof(uint32_t))) {
 		uint32_t *p = (uint32_t *)buf;
 		len = len >> 2;
 		for (i = 0; i < len; i++)
-			writel_relaxed(p[i], chip->IO_ADDR_W);
+			writel_relaxed(p[i], host->data_va);
 	} else {
 		for (i = 0; i < len; i++)
-			writeb_relaxed(buf[i], chip->IO_ADDR_W);
+			writeb_relaxed(buf[i], host->data_va);
 	}
 }
 
@@ -621,18 +603,18 @@ static void fsmc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
  */
 static void fsmc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 {
+	struct fsmc_nand_data *host  = mtd_to_fsmc(mtd);
 	int i;
-	struct nand_chip *chip = mtd_to_nand(mtd);
 
 	if (IS_ALIGNED((uint32_t)buf, sizeof(uint32_t)) &&
 			IS_ALIGNED(len, sizeof(uint32_t))) {
 		uint32_t *p = (uint32_t *)buf;
 		len = len >> 2;
 		for (i = 0; i < len; i++)
-			p[i] = readl_relaxed(chip->IO_ADDR_R);
+			p[i] = readl_relaxed(host->data_va);
 	} else {
 		for (i = 0; i < len; i++)
-			buf[i] = readb_relaxed(chip->IO_ADDR_R);
+			buf[i] = readb_relaxed(host->data_va);
 	}
 }
 
@@ -754,13 +736,11 @@ static int fsmc_bch8_correct_data(struct mtd_info *mtd, uint8_t *dat,
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-	void __iomem *regs = host->regs_va;
-	unsigned int bank = host->bank;
 	uint32_t err_idx[8];
 	uint32_t num_err, i;
 	uint32_t ecc1, ecc2, ecc3, ecc4;
 
-	num_err = (readl_relaxed(FSMC_NAND_REG(regs, bank, STS)) >> 10) & 0xF;
+	num_err = (readl_relaxed(host->regs_va + STS) >> 10) & 0xF;
 
 	/* no bit flipping */
 	if (likely(num_err == 0))
@@ -803,10 +783,10 @@ static int fsmc_bch8_correct_data(struct mtd_info *mtd, uint8_t *dat,
 	 * uint64_t array and error offset indexes are populated in err_idx
 	 * array
 	 */
-	ecc1 = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC1));
-	ecc2 = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC2));
-	ecc3 = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC3));
-	ecc4 = readl_relaxed(FSMC_NAND_REG(regs, bank, STS));
+	ecc1 = readl_relaxed(host->regs_va + ECC1);
+	ecc2 = readl_relaxed(host->regs_va + ECC2);
+	ecc3 = readl_relaxed(host->regs_va + ECC3);
+	ecc4 = readl_relaxed(host->regs_va + STS);
 
 	err_idx[0] = (ecc1 >> 0) & 0x1FFF;
 	err_idx[1] = (ecc1 >> 13) & 0x1FFF;
@@ -889,6 +869,7 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	struct mtd_info *mtd;
 	struct nand_chip *nand;
 	struct resource *res;
+	void __iomem *base;
 	dma_cap_mask_t mask;
 	int ret = 0;
 	u32 pid;
@@ -923,9 +904,12 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 		return PTR_ERR(host->cmd_va);
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fsmc_regs");
-	host->regs_va = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(host->regs_va))
-		return PTR_ERR(host->regs_va);
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	host->regs_va = base + FSMC_NOR_REG_SIZE +
+		(host->bank * FSMC_NAND_BANK_SZ);
 
 	host->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(host->clk)) {
@@ -942,7 +926,7 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	 * AMBA PrimeCell bus. However it is not a PrimeCell.
 	 */
 	for (pid = 0, i = 0; i < 4; i++)
-		pid |= (readl(host->regs_va + resource_size(res) - 0x20 + 4 * i) & 255) << (i * 8);
+		pid |= (readl(base + resource_size(res) - 0x20 + 4 * i) & 255) << (i * 8);
 	host->pid = pid;
 	dev_info(&pdev->dev, "FSMC device partno %03x, manufacturer %02x, "
 		 "revision %02x, config %02x\n",
-- 
2.14.1

[PATCH v2 2/2] mtd: nand: fsmc: use ->exec_op()

[Miquel Raynal]

Remove the deprecated ->cmd_ctrl() implementation to use ->exec_op() in
the fsmc_nand driver.

Implement the ->select_chip() hook to avoid having to support the hack
from the core that send a NAND_CMD_NONE with NAND_NCE to signal a
deassertion of nCE.

Also get rid of the last references to ->IO_ADDR_[R|W] that are not used
anymore.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/mtd/nand/fsmc_nand.c | 150 ++++++++++++++++++++++++++++---------------
 1 file changed, 99 insertions(+), 51 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 1454d9bf1e49..f54ccc847012 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -253,43 +253,6 @@ static inline struct fsmc_nand_data *mtd_to_fsmc(struct mtd_info *mtd)
 	return container_of(mtd_to_nand(mtd), struct fsmc_nand_data, nand);
 }
 
-/*
- * fsmc_cmd_ctrl - For facilitaing Hardware access
- * This routine allows hardware specific access to control-lines(ALE,CLE)
- */
-static void fsmc_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
-{
-	struct nand_chip *this = mtd_to_nand(mtd);
-	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-
-	if (ctrl & NAND_CTRL_CHANGE) {
-		u32 pc;
-
-		if (ctrl & NAND_CLE) {
-			this->IO_ADDR_R = host->cmd_va;
-			this->IO_ADDR_W = host->cmd_va;
-		} else if (ctrl & NAND_ALE) {
-			this->IO_ADDR_R = host->addr_va;
-			this->IO_ADDR_W = host->addr_va;
-		} else {
-			this->IO_ADDR_R = host->data_va;
-			this->IO_ADDR_W = host->data_va;
-		}
-
-		pc = readl(host->regs_va + PC);
-		if (ctrl & NAND_NCE)
-			pc |= FSMC_ENABLE;
-		else
-			pc &= ~FSMC_ENABLE;
-		writel_relaxed(pc, host->regs_va + PC);
-	}
-
-	mb();
-
-	if (cmd != NAND_CMD_NONE)
-		writeb_relaxed(cmd, this->IO_ADDR_W);
-}
-
 /*
  * fsmc_nand_setup - FSMC (Flexible Static Memory Controller) init routine
  *
@@ -645,6 +608,102 @@ static void fsmc_write_buf_dma(struct mtd_info *mtd, const uint8_t *buf,
 	dma_xfer(host, (void *)buf, len, DMA_TO_DEVICE);
 }
 
+/* fsmc_select_chip - assert or deassert nCE */
+static void fsmc_select_chip(struct mtd_info *mtd, int chipnr)
+{
+	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
+	u32 pc;
+
+	/* Support only one CS */
+	if (chipnr > 0)
+		return;
+
+	pc = readl(host->regs_va + PC);
+	if (chipnr < 0)
+		writel_relaxed(pc & ~FSMC_ENABLE, host->regs_va + PC);
+	else
+		writel_relaxed(pc | FSMC_ENABLE, host->regs_va + PC);
+
+	/* nCE line must be asserted before starting any operation */
+	mb();
+}
+
+/*
+ * fsmc_exec_op - hook called by the core to execute NAND operations
+ *
+ * This controller is simple enough and thus does not need to use the parser
+ * provided by the core, instead, handle every situation here.
+ */
+static int fsmc_exec_op(struct nand_chip *chip, const struct nand_operation *op,
+			bool check_only)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
+	const struct nand_op_instr *instr = NULL;
+	int ret = 0;
+	unsigned int op_id;
+	int i;
+
+	pr_debug("Executing operation [%d instructions]:\n", op->ninstrs);
+	for (op_id = 0; op_id < op->ninstrs; op_id++) {
+		instr = &op->instrs[op_id];
+
+		switch (instr->type) {
+		case NAND_OP_CMD_INSTR:
+			pr_debug("  ->CMD      [0x%02x]\n",
+				 instr->ctx.cmd.opcode);
+
+			writeb_relaxed(instr->ctx.cmd.opcode, host->cmd_va);
+			break;
+
+		case NAND_OP_ADDR_INSTR:
+			pr_debug("  ->ADDR     [%d cyc]",
+				 instr->ctx.addr.naddrs);
+
+			for (i = 0; i < instr->ctx.addr.naddrs; i++)
+				writeb_relaxed(instr->ctx.addr.addrs[i],
+					       host->addr_va);
+			break;
+
+		case NAND_OP_DATA_IN_INSTR:
+			pr_debug("  ->DATA_IN  [%d B%s]\n", instr->ctx.data.len,
+				 instr->ctx.data.force_8bit ?
+				 ", force 8-bit" : "");
+
+			if (host->mode == USE_DMA_ACCESS)
+				fsmc_read_buf_dma(mtd, instr->ctx.data.buf.in,
+						  instr->ctx.data.len);
+			else
+				fsmc_read_buf(mtd, instr->ctx.data.buf.in,
+					      instr->ctx.data.len);
+			break;
+
+		case NAND_OP_DATA_OUT_INSTR:
+			pr_debug("  ->DATA_OUT [%d B%s]\n", instr->ctx.data.len,
+				 instr->ctx.data.force_8bit ?
+				 ", force 8-bit" : "");
+
+			if (host->mode == USE_DMA_ACCESS)
+				fsmc_write_buf_dma(mtd, instr->ctx.data.buf.out,
+						   instr->ctx.data.len);
+			else
+				fsmc_write_buf(mtd, instr->ctx.data.buf.out,
+					       instr->ctx.data.len);
+			break;
+
+		case NAND_OP_WAITRDY_INSTR:
+			pr_debug("  ->WAITRDY  [max %d ms]\n",
+				 instr->ctx.waitrdy.timeout_ms);
+
+			ret = nand_soft_waitrdy(chip,
+						instr->ctx.waitrdy.timeout_ms);
+			break;
+		}
+	}
+
+	return ret;
+}
+
 /*
  * fsmc_read_page_hwecc
  * @mtd:	mtd info structure
@@ -944,9 +1003,8 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	nand_set_flash_node(nand, pdev->dev.of_node);
 
 	mtd->dev.parent = &pdev->dev;
-	nand->IO_ADDR_R = host->data_va;
-	nand->IO_ADDR_W = host->data_va;
-	nand->cmd_ctrl = fsmc_cmd_ctrl;
+	nand->exec_op = fsmc_exec_op;
+	nand->select_chip = fsmc_select_chip;
 	nand->chip_delay = 30;
 
 	/*
@@ -958,8 +1016,7 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	nand->ecc.size = 512;
 	nand->badblockbits = 7;
 
-	switch (host->mode) {
-	case USE_DMA_ACCESS:
+	if (host->mode == USE_DMA_ACCESS) {
 		dma_cap_zero(mask);
 		dma_cap_set(DMA_MEMCPY, mask);
 		host->read_dma_chan = dma_request_channel(mask, filter, NULL);
@@ -972,15 +1029,6 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 			dev_err(&pdev->dev, "Unable to get write dma channel\n");
 			goto err_req_write_chnl;
 		}
-		nand->read_buf = fsmc_read_buf_dma;
-		nand->write_buf = fsmc_write_buf_dma;
-		break;
-
-	default:
-	case USE_WORD_ACCESS:
-		nand->read_buf = fsmc_read_buf;
-		nand->write_buf = fsmc_write_buf;
-		break;
 	}
 
 	if (host->dev_timings)
-- 
2.14.1

Re: [PATCH v2 0/2] Convert FSMC NAND controller driver to ->exec_op()

[Boris Brezillon]

On Fri, 16 Feb 2018 15:22:46 +0100
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> Hello,
> 
> Now that the ->exec_op() interface has been merged in the NAND core,
> convert the FSMC NAND controller driver to it.
> 
> A previous step involves getting rid of ->IO_ADDR_[R|W] across the
> driver, which is almost entirely done in the first patch. Because the
> driver still uses at that point the default implementations of
> ->read/write_byte/word(), some references are still present but are  
> removed as soon as the driver is moved to ->exec_op(), when this
> dependency disappears.
> 
> Best regards,
> Miquèl
> 
> 
> Changes since v1:
> =================
> 
> - Forgot about the NAND unique ID for now, this will need a deeper
>   rework of the MTD stack and is very (ONFI-)NAND-specific.
> - Split the migration of FSMC driver to ->exec_op() into two patches,
>   one to get rid of ->IO_ADDR_[R|W], the other to implement ->exec_op()
>   and ->select_chip() which is also needed.
> - Got rid of the additional ->regs entry in the FSMC structure, using
>   the existing entry ->regs_va instead.
> 
> 
> Miquel Raynal (2):
>   mtd: nand: fsmc: get rid of IO_ADDR_[R|W]
>   mtd: nand: fsmc: use ->exec_op()

Applied.

Thanks,

Boris

> 
>  drivers/mtd/nand/fsmc_nand.c | 242 ++++++++++++++++++++++++-------------------
>  1 file changed, 137 insertions(+), 105 deletions(-)
> 



-- 
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com