[PATCH v2 0/6] mtd: nand: omap2: Switch to exec_ops, support AM64 SoC

[PATCH v2 0/6] mtd: nand: omap2: Switch to exec_ops, support AM64 SoC

[Roger Quadros]

Hi,

This series gets rid of the Legacy ops and switches to exec_ops framework.

Also add support for TI's AM64 SoC which contains a GPMC NAND controller.

Changelog:
v2
- Dropped the quirk code for AM64 SR1.0. Will add this later when
there is more clarity on compatible ID that will be used for this SoC.
Production version of AM64 SoC shouldn't require this quirk.
- Changed commit message title to "mtd: rawnand: omap2:"
- Added 2 new patches.
	1) fixes force_8bit behaviour for DMA mode
	2) drops unused variable

Roger Quadros (6):
  dt-bindings: mtd: ti,gpmc-nand: Add compatible for AM64 NAND
  mtd: rawnand: omap2: Allow build on K3 platforms
  mtd: rawnand: omap2: move to exec_op interface
  mtd: rawnand: omap2: Add compatible for AM64 SoC
  mtd: rawnand: omap2: fix force_8bit flag behaviour for DMA mode
  mtd: rawnand: omap2: drop unused variable

 .../devicetree/bindings/mtd/ti,gpmc-nand.yaml |   5 +-
 drivers/mtd/nand/raw/Kconfig                  |   2 +-
 drivers/mtd/nand/raw/omap2.c                  | 503 ++++++++----------
 3 files changed, 226 insertions(+), 284 deletions(-)

-- 
2.17.1

[PATCH v2 0/6] mtd: nand: omap2: Switch to exec_ops, support AM64 SoC

[Roger Quadros]

Hi,

This series gets rid of the Legacy ops and switches to exec_ops framework.

Also add support for TI's AM64 SoC which contains a GPMC NAND controller.

Changelog:
v2
- Dropped the quirk code for AM64 SR1.0. Will add this later when
there is more clarity on compatible ID that will be used for this SoC.
Production version of AM64 SoC shouldn't require this quirk.
- Changed commit message title to "mtd: rawnand: omap2:"
- Added 2 new patches.
	1) fixes force_8bit behaviour for DMA mode
	2) drops unused variable

Roger Quadros (6):
  dt-bindings: mtd: ti,gpmc-nand: Add compatible for AM64 NAND
  mtd: rawnand: omap2: Allow build on K3 platforms
  mtd: rawnand: omap2: move to exec_op interface
  mtd: rawnand: omap2: Add compatible for AM64 SoC
  mtd: rawnand: omap2: fix force_8bit flag behaviour for DMA mode
  mtd: rawnand: omap2: drop unused variable

 .../devicetree/bindings/mtd/ti,gpmc-nand.yaml |   5 +-
 drivers/mtd/nand/raw/Kconfig                  |   2 +-
 drivers/mtd/nand/raw/omap2.c                  | 503 ++++++++----------
 3 files changed, 226 insertions(+), 284 deletions(-)

-- 
2.17.1


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http://lists.infradead.org/mailman/listinfo/linux-mtd/

[PATCH v2 1/6] dt-bindings: mtd: ti,gpmc-nand: Add compatible for AM64 NAND

[Roger Quadros]

AM64 SoC contains the GPMC NAND controller. Add compatible for it.

Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Roger Quadros <rogerq@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml b/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml
index beb26b9bcfb2..666ae4a78544 100644
--- a/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml
+++ b/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml
@@ -16,7 +16,10 @@ description:
 
 properties:
   compatible:
-    const: ti,omap2-nand
+    items:
+      - enum:
+          - ti,am64-nand
+          - ti,omap2-nand
 
   reg:
     maxItems: 1
-- 
2.17.1

[PATCH v2 1/6] dt-bindings: mtd: ti, gpmc-nand: Add compatible for AM64 NAND

[Roger Quadros]

AM64 SoC contains the GPMC NAND controller. Add compatible for it.

Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Roger Quadros <rogerq@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml b/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml
index beb26b9bcfb2..666ae4a78544 100644
--- a/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml
+++ b/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml
@@ -16,7 +16,10 @@ description:
 
 properties:
   compatible:
-    const: ti,omap2-nand
+    items:
+      - enum:
+          - ti,am64-nand
+          - ti,omap2-nand
 
   reg:
     maxItems: 1
-- 
2.17.1


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http://lists.infradead.org/mailman/listinfo/linux-mtd/

[PATCH v2 2/6] mtd: rawnand: omap2: Allow build on K3 platforms

[Roger Quadros]

K3 platforms come with GPMC. Enable GPMC build for
K3 platforms.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 67b7cb67c030..d719316467a1 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -40,7 +40,7 @@ config MTD_NAND_AMS_DELTA
 
 config MTD_NAND_OMAP2
 	tristate "OMAP2, OMAP3, OMAP4 and Keystone NAND controller"
-	depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || COMPILE_TEST
+	depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST
 	depends on HAS_IOMEM
 	help
 	  Support for NAND flash on Texas Instruments OMAP2, OMAP3, OMAP4
-- 
2.17.1

[PATCH v2 2/6] mtd: rawnand: omap2: Allow build on K3 platforms

[Roger Quadros]

K3 platforms come with GPMC. Enable GPMC build for
K3 platforms.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 67b7cb67c030..d719316467a1 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -40,7 +40,7 @@ config MTD_NAND_AMS_DELTA
 
 config MTD_NAND_OMAP2
 	tristate "OMAP2, OMAP3, OMAP4 and Keystone NAND controller"
-	depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || COMPILE_TEST
+	depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST
 	depends on HAS_IOMEM
 	help
 	  Support for NAND flash on Texas Instruments OMAP2, OMAP3, OMAP4
-- 
2.17.1


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http://lists.infradead.org/mailman/listinfo/linux-mtd/

[PATCH v2 3/6] mtd: rawnand: omap2: move to exec_op interface

[Roger Quadros]

Stop using legacy interface and move to the exec_op interface.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/omap2.c | 490 +++++++++++++++--------------------
 1 file changed, 211 insertions(+), 279 deletions(-)

diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index b26d4947af02..224c91282c87 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -19,7 +19,7 @@
 #include <linux/mtd/rawnand.h>
 #include <linux/mtd/partitions.h>
 #include <linux/omap-dma.h>
-#include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
@@ -164,6 +164,7 @@ struct omap_nand_info {
 	u_char				*buf;
 	int					buf_len;
 	/* Interface to GPMC */
+	void __iomem			*fifo;
 	struct gpmc_nand_regs		reg;
 	struct gpmc_nand_ops		*ops;
 	bool				flash_bbt;
@@ -175,6 +176,11 @@ struct omap_nand_info {
 	unsigned int			nsteps_per_eccpg;
 	unsigned int			eccpg_size;
 	unsigned int			eccpg_bytes;
+	void (*data_in)(struct nand_chip *chip, void *buf,
+			unsigned int len, bool force_8bit);
+	void (*data_out)(struct nand_chip *chip,
+			 const void *buf, unsigned int len,
+			 bool force_8bit);
 };
 
 static inline struct omap_nand_info *mtd_to_omap(struct mtd_info *mtd)
@@ -182,6 +188,13 @@ static inline struct omap_nand_info *mtd_to_omap(struct mtd_info *mtd)
 	return container_of(mtd_to_nand(mtd), struct omap_nand_info, nand);
 }
 
+static void omap_nand_data_in(struct nand_chip *chip, void *buf,
+			      unsigned int len, bool force_8bit);
+
+static void omap_nand_data_out(struct nand_chip *chip,
+			       const void *buf, unsigned int len,
+			       bool force_8bit);
+
 /**
  * omap_prefetch_enable - configures and starts prefetch transfer
  * @cs: cs (chip select) number
@@ -241,169 +254,70 @@ static int omap_prefetch_reset(int cs, struct omap_nand_info *info)
 }
 
 /**
- * omap_hwcontrol - hardware specific access to control-lines
- * @chip: NAND chip object
- * @cmd: command to device
- * @ctrl:
- * NAND_NCE: bit 0 -> don't care
- * NAND_CLE: bit 1 -> Command Latch
- * NAND_ALE: bit 2 -> Address Latch
- *
- * NOTE: boards may use different bits for these!!
+ * omap_nand_data_in_pref - NAND data in using prefetch engine
  */
-static void omap_hwcontrol(struct nand_chip *chip, int cmd, unsigned int ctrl)
+static void omap_nand_data_in_pref(struct nand_chip *chip, void *buf,
+				   unsigned int len, bool force_8bit)
 {
 	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
-
-	if (cmd != NAND_CMD_NONE) {
-		if (ctrl & NAND_CLE)
-			writeb(cmd, info->reg.gpmc_nand_command);
-
-		else if (ctrl & NAND_ALE)
-			writeb(cmd, info->reg.gpmc_nand_address);
-
-		else /* NAND_NCE */
-			writeb(cmd, info->reg.gpmc_nand_data);
-	}
-}
-
-/**
- * omap_read_buf8 - read data from NAND controller into buffer
- * @mtd: MTD device structure
- * @buf: buffer to store date
- * @len: number of bytes to read
- */
-static void omap_read_buf8(struct mtd_info *mtd, u_char *buf, int len)
-{
-	struct nand_chip *nand = mtd_to_nand(mtd);
-
-	ioread8_rep(nand->legacy.IO_ADDR_R, buf, len);
-}
-
-/**
- * omap_write_buf8 - write buffer to NAND controller
- * @mtd: MTD device structure
- * @buf: data buffer
- * @len: number of bytes to write
- */
-static void omap_write_buf8(struct mtd_info *mtd, const u_char *buf, int len)
-{
-	struct omap_nand_info *info = mtd_to_omap(mtd);
-	u_char *p = (u_char *)buf;
-	bool status;
-
-	while (len--) {
-		iowrite8(*p++, info->nand.legacy.IO_ADDR_W);
-		/* wait until buffer is available for write */
-		do {
-			status = info->ops->nand_writebuffer_empty();
-		} while (!status);
-	}
-}
-
-/**
- * omap_read_buf16 - read data from NAND controller into buffer
- * @mtd: MTD device structure
- * @buf: buffer to store date
- * @len: number of bytes to read
- */
-static void omap_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
-{
-	struct nand_chip *nand = mtd_to_nand(mtd);
-
-	ioread16_rep(nand->legacy.IO_ADDR_R, buf, len / 2);
-}
-
-/**
- * omap_write_buf16 - write buffer to NAND controller
- * @mtd: MTD device structure
- * @buf: data buffer
- * @len: number of bytes to write
- */
-static void omap_write_buf16(struct mtd_info *mtd, const u_char * buf, int len)
-{
-	struct omap_nand_info *info = mtd_to_omap(mtd);
-	u16 *p = (u16 *) buf;
-	bool status;
-	/* FIXME try bursts of writesw() or DMA ... */
-	len >>= 1;
-
-	while (len--) {
-		iowrite16(*p++, info->nand.legacy.IO_ADDR_W);
-		/* wait until buffer is available for write */
-		do {
-			status = info->ops->nand_writebuffer_empty();
-		} while (!status);
-	}
-}
-
-/**
- * omap_read_buf_pref - read data from NAND controller into buffer
- * @chip: NAND chip object
- * @buf: buffer to store date
- * @len: number of bytes to read
- */
-static void omap_read_buf_pref(struct nand_chip *chip, u_char *buf, int len)
-{
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct omap_nand_info *info = mtd_to_omap(mtd);
 	uint32_t r_count = 0;
 	int ret = 0;
 	u32 *p = (u32 *)buf;
+	unsigned int pref_len;
 
-	/* take care of subpage reads */
-	if (len % 4) {
-		if (info->nand.options & NAND_BUSWIDTH_16)
-			omap_read_buf16(mtd, buf, len % 4);
-		else
-			omap_read_buf8(mtd, buf, len % 4);
-		p = (u32 *) (buf + len % 4);
-		len -= len % 4;
+	if (force_8bit) {
+		omap_nand_data_in(chip, buf, len, force_8bit);
+		return;
 	}
 
+	/* read 32-bit words using prefetch and remaining bytes normally */
+
 	/* configure and start prefetch transfer */
+	pref_len = len - (len & 3);
 	ret = omap_prefetch_enable(info->gpmc_cs,
-			PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x0, info);
+			PREFETCH_FIFOTHRESHOLD_MAX, 0x0, pref_len, 0x0, info);
 	if (ret) {
-		/* PFPW engine is busy, use cpu copy method */
-		if (info->nand.options & NAND_BUSWIDTH_16)
-			omap_read_buf16(mtd, (u_char *)p, len);
-		else
-			omap_read_buf8(mtd, (u_char *)p, len);
+		/* prefetch engine is busy, use CPU copy method */
+		omap_nand_data_in(chip, buf, len, false);
 	} else {
 		do {
 			r_count = readl(info->reg.gpmc_prefetch_status);
 			r_count = PREFETCH_STATUS_FIFO_CNT(r_count);
 			r_count = r_count >> 2;
-			ioread32_rep(info->nand.legacy.IO_ADDR_R, p, r_count);
+			ioread32_rep(info->fifo, p, r_count);
 			p += r_count;
-			len -= r_count << 2;
-		} while (len);
-		/* disable and stop the PFPW engine */
+			pref_len -= r_count << 2;
+		} while (pref_len);
+		/* disable and stop the Prefetch engine */
 		omap_prefetch_reset(info->gpmc_cs, info);
+		/* fetch any remaining bytes */
+		if (len & 3)
+			omap_nand_data_in(chip, p, len & 3, false);
 	}
 }
 
 /**
- * omap_write_buf_pref - write buffer to NAND controller
- * @chip: NAND chip object
- * @buf: data buffer
- * @len: number of bytes to write
+ * omap_nand_data_out_pref - NAND data out using Write Posting engine
  */
-static void omap_write_buf_pref(struct nand_chip *chip, const u_char *buf,
-				int len)
+static void omap_nand_data_out_pref(struct nand_chip *chip,
+				    const void *buf, unsigned int len,
+				    bool force_8bit)
 {
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
 	uint32_t w_count = 0;
 	int i = 0, ret = 0;
 	u16 *p = (u16 *)buf;
 	unsigned long tim, limit;
 	u32 val;
 
+	if (force_8bit) {
+		omap_nand_data_out(chip, buf, len, force_8bit);
+		return;
+	}
+
 	/* take care of subpage writes */
 	if (len % 2 != 0) {
-		writeb(*buf, info->nand.legacy.IO_ADDR_W);
+		writeb(*(u8 *)buf, info->fifo);
 		p = (u16 *)(buf + 1);
 		len--;
 	}
@@ -412,18 +326,15 @@ static void omap_write_buf_pref(struct nand_chip *chip, const u_char *buf,
 	ret = omap_prefetch_enable(info->gpmc_cs,
 			PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1, info);
 	if (ret) {
-		/* PFPW engine is busy, use cpu copy method */
-		if (info->nand.options & NAND_BUSWIDTH_16)
-			omap_write_buf16(mtd, (u_char *)p, len);
-		else
-			omap_write_buf8(mtd, (u_char *)p, len);
+		/* write posting engine is busy, use CPU copy method */
+		omap_nand_data_out(chip, buf, len, false);
 	} else {
 		while (len) {
 			w_count = readl(info->reg.gpmc_prefetch_status);
 			w_count = PREFETCH_STATUS_FIFO_CNT(w_count);
 			w_count = w_count >> 1;
 			for (i = 0; (i < w_count) && len; i++, len -= 2)
-				iowrite16(*p++, info->nand.legacy.IO_ADDR_W);
+				iowrite16(*p++, info->fifo);
 		}
 		/* wait for data to flushed-out before reset the prefetch */
 		tim = 0;
@@ -451,15 +362,16 @@ static void omap_nand_dma_callback(void *data)
 
 /*
  * omap_nand_dma_transfer: configure and start dma transfer
- * @mtd: MTD device structure
+ * @chip: nand chip structure
  * @addr: virtual address in RAM of source/destination
  * @len: number of data bytes to be transferred
  * @is_write: flag for read/write operation
  */
-static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
-					unsigned int len, int is_write)
+static inline int omap_nand_dma_transfer(struct nand_chip *chip,
+					 const void *addr, unsigned int len,
+					 int is_write)
 {
-	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
 	struct dma_async_tx_descriptor *tx;
 	enum dma_data_direction dir = is_write ? DMA_TO_DEVICE :
 							DMA_FROM_DEVICE;
@@ -521,49 +433,41 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
 out_copy_unmap:
 	dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
 out_copy:
-	if (info->nand.options & NAND_BUSWIDTH_16)
-		is_write == 0 ? omap_read_buf16(mtd, (u_char *) addr, len)
-			: omap_write_buf16(mtd, (u_char *) addr, len);
-	else
-		is_write == 0 ? omap_read_buf8(mtd, (u_char *) addr, len)
-			: omap_write_buf8(mtd, (u_char *) addr, len);
+	is_write == 0 ? omap_nand_data_in(chip, (void *)addr, len, false)
+		      : omap_nand_data_out(chip, addr, len, false);
+
 	return 0;
 }
 
 /**
- * omap_read_buf_dma_pref - read data from NAND controller into buffer
- * @chip: NAND chip object
- * @buf: buffer to store date
- * @len: number of bytes to read
+ * omap_nand_data_in_dma_pref - NAND data in using DMA and Prefetch
  */
-static void omap_read_buf_dma_pref(struct nand_chip *chip, u_char *buf,
-				   int len)
+static void omap_nand_data_in_dma_pref(struct nand_chip *chip, void *buf,
+				       unsigned int len, bool force_8bit)
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
 	if (len <= mtd->oobsize)
-		omap_read_buf_pref(chip, buf, len);
+		omap_nand_data_in_pref(chip, buf, len, false);
 	else
 		/* start transfer in DMA mode */
-		omap_nand_dma_transfer(mtd, buf, len, 0x0);
+		omap_nand_dma_transfer(chip, buf, len, 0x0);
 }
 
 /**
- * omap_write_buf_dma_pref - write buffer to NAND controller
- * @chip: NAND chip object
- * @buf: data buffer
- * @len: number of bytes to write
+ * omap_nand_data_out_dma_pref - NAND data out using DMA and write posting
  */
-static void omap_write_buf_dma_pref(struct nand_chip *chip, const u_char *buf,
-				    int len)
+static void omap_nand_data_out_dma_pref(struct nand_chip *chip,
+					const void *buf, unsigned int len,
+					bool force_8bit)
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
 	if (len <= mtd->oobsize)
-		omap_write_buf_pref(chip, buf, len);
+		omap_nand_data_out_pref(chip, buf, len, false);
 	else
 		/* start transfer in DMA mode */
-		omap_nand_dma_transfer(mtd, (u_char *)buf, len, 0x1);
+		omap_nand_dma_transfer(chip, buf, len, 0x1);
 }
 
 /*
@@ -587,13 +491,13 @@ static irqreturn_t omap_nand_irq(int this_irq, void *dev)
 			bytes = info->buf_len;
 		else if (!info->buf_len)
 			bytes = 0;
-		iowrite32_rep(info->nand.legacy.IO_ADDR_W, (u32 *)info->buf,
+		iowrite32_rep(info->fifo, (u32 *)info->buf,
 			      bytes >> 2);
 		info->buf = info->buf + bytes;
 		info->buf_len -= bytes;
 
 	} else {
-		ioread32_rep(info->nand.legacy.IO_ADDR_R, (u32 *)info->buf,
+		ioread32_rep(info->fifo, (u32 *)info->buf,
 			     bytes >> 2);
 		info->buf = info->buf + bytes;
 
@@ -613,20 +517,17 @@ static irqreturn_t omap_nand_irq(int this_irq, void *dev)
 }
 
 /*
- * omap_read_buf_irq_pref - read data from NAND controller into buffer
- * @chip: NAND chip object
- * @buf: buffer to store date
- * @len: number of bytes to read
+ * omap_nand_data_in_irq_pref - NAND data in using Prefetch and IRQ
  */
-static void omap_read_buf_irq_pref(struct nand_chip *chip, u_char *buf,
-				   int len)
+static void omap_nand_data_in_irq_pref(struct nand_chip *chip, void *buf,
+				       unsigned int len, bool force_8bit)
 {
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	struct mtd_info *mtd = nand_to_mtd(&info->nand);
 	int ret = 0;
 
-	if (len <= mtd->oobsize) {
-		omap_read_buf_pref(chip, buf, len);
+	if (len <= mtd->oobsize || force_8bit) {
+		omap_nand_data_in(chip, buf, len, force_8bit);
 		return;
 	}
 
@@ -637,9 +538,11 @@ static void omap_read_buf_irq_pref(struct nand_chip *chip, u_char *buf,
 	/*  configure and start prefetch transfer */
 	ret = omap_prefetch_enable(info->gpmc_cs,
 			PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0, info);
-	if (ret)
+	if (ret) {
 		/* PFPW engine is busy, use cpu copy method */
-		goto out_copy;
+		omap_nand_data_in(chip, buf, len, false);
+		return;
+	}
 
 	info->buf_len = len;
 
@@ -652,31 +555,23 @@ static void omap_read_buf_irq_pref(struct nand_chip *chip, u_char *buf,
 	/* disable and stop the PFPW engine */
 	omap_prefetch_reset(info->gpmc_cs, info);
 	return;
-
-out_copy:
-	if (info->nand.options & NAND_BUSWIDTH_16)
-		omap_read_buf16(mtd, buf, len);
-	else
-		omap_read_buf8(mtd, buf, len);
 }
 
 /*
- * omap_write_buf_irq_pref - write buffer to NAND controller
- * @chip: NAND chip object
- * @buf: data buffer
- * @len: number of bytes to write
+ * omap_nand_data_out_irq_pref - NAND out using write posting and IRQ
  */
-static void omap_write_buf_irq_pref(struct nand_chip *chip, const u_char *buf,
-				    int len)
+static void omap_nand_data_out_irq_pref(struct nand_chip *chip,
+					const void *buf, unsigned int len,
+					bool force_8bit)
 {
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	struct mtd_info *mtd = nand_to_mtd(&info->nand);
 	int ret = 0;
 	unsigned long tim, limit;
 	u32 val;
 
-	if (len <= mtd->oobsize) {
-		omap_write_buf_pref(chip, buf, len);
+	if (len <= mtd->oobsize || force_8bit) {
+		omap_nand_data_out(chip, buf, len, force_8bit);
 		return;
 	}
 
@@ -687,9 +582,11 @@ static void omap_write_buf_irq_pref(struct nand_chip *chip, const u_char *buf,
 	/* configure and start prefetch transfer : size=24 */
 	ret = omap_prefetch_enable(info->gpmc_cs,
 		(PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1, info);
-	if (ret)
+	if (ret) {
 		/* PFPW engine is busy, use cpu copy method */
-		goto out_copy;
+		omap_nand_data_out(chip, buf, len, false);
+		return;
+	}
 
 	info->buf_len = len;
 
@@ -711,12 +608,6 @@ static void omap_write_buf_irq_pref(struct nand_chip *chip, const u_char *buf,
 	/* disable and stop the PFPW engine */
 	omap_prefetch_reset(info->gpmc_cs, info);
 	return;
-
-out_copy:
-	if (info->nand.options & NAND_BUSWIDTH_16)
-		omap_write_buf16(mtd, buf, len);
-	else
-		omap_write_buf8(mtd, buf, len);
 }
 
 /**
@@ -981,50 +872,6 @@ static void omap_enable_hwecc(struct nand_chip *chip, int mode)
 	writel(val, info->reg.gpmc_ecc_config);
 }
 
-/**
- * omap_wait - wait until the command is done
- * @this: NAND Chip structure
- *
- * Wait function is called during Program and erase operations and
- * the way it is called from MTD layer, we should wait till the NAND
- * chip is ready after the programming/erase operation has completed.
- *
- * Erase can take up to 400ms and program up to 20ms according to
- * general NAND and SmartMedia specs
- */
-static int omap_wait(struct nand_chip *this)
-{
-	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(this));
-	unsigned long timeo = jiffies;
-	int status;
-
-	timeo += msecs_to_jiffies(400);
-
-	writeb(NAND_CMD_STATUS & 0xFF, info->reg.gpmc_nand_command);
-	while (time_before(jiffies, timeo)) {
-		status = readb(info->reg.gpmc_nand_data);
-		if (status & NAND_STATUS_READY)
-			break;
-		cond_resched();
-	}
-
-	status = readb(info->reg.gpmc_nand_data);
-	return status;
-}
-
-/**
- * omap_dev_ready - checks the NAND Ready GPIO line
- * @chip: NAND chip object
- *
- * Returns true if ready and false if busy.
- */
-static int omap_dev_ready(struct nand_chip *chip)
-{
-	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
-
-	return gpiod_get_value(info->ready_gpiod);
-}
-
 /**
  * omap_enable_hwecc_bch - Program GPMC to perform BCH ECC calculation
  * @chip: NAND chip object
@@ -1543,8 +1390,8 @@ static int omap_write_page_bch(struct nand_chip *chip, const uint8_t *buf,
 		chip->ecc.hwctl(chip, NAND_ECC_WRITE);
 
 		/* Write data */
-		chip->legacy.write_buf(chip, buf + (eccpg * info->eccpg_size),
-				       info->eccpg_size);
+		info->data_out(chip, buf + (eccpg * info->eccpg_size),
+			       info->eccpg_size, false);
 
 		/* Update ecc vector from GPMC result registers */
 		ret = omap_calculate_ecc_bch_multi(mtd,
@@ -1562,7 +1409,7 @@ static int omap_write_page_bch(struct nand_chip *chip, const uint8_t *buf,
 	}
 
 	/* Write ecc vector to OOB area */
-	chip->legacy.write_buf(chip, chip->oob_poi, mtd->oobsize);
+	info->data_out(chip, chip->oob_poi, mtd->oobsize, false);
 
 	return nand_prog_page_end_op(chip);
 }
@@ -1607,8 +1454,8 @@ static int omap_write_subpage_bch(struct nand_chip *chip, u32 offset,
 		chip->ecc.hwctl(chip, NAND_ECC_WRITE);
 
 		/* Write data */
-		chip->legacy.write_buf(chip, buf + (eccpg * info->eccpg_size),
-				       info->eccpg_size);
+		info->data_out(chip, buf + (eccpg * info->eccpg_size),
+			       info->eccpg_size, false);
 
 		for (step = 0; step < info->nsteps_per_eccpg; step++) {
 			unsigned int base_step = eccpg * info->nsteps_per_eccpg;
@@ -1641,7 +1488,7 @@ static int omap_write_subpage_bch(struct nand_chip *chip, u32 offset,
 	}
 
 	/* write OOB buffer to NAND device */
-	chip->legacy.write_buf(chip, chip->oob_poi, mtd->oobsize);
+	info->data_out(chip, chip->oob_poi, mtd->oobsize, false);
 
 	return nand_prog_page_end_op(chip);
 }
@@ -1984,8 +1831,8 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 	/* Re-populate low-level callbacks based on xfer modes */
 	switch (info->xfer_type) {
 	case NAND_OMAP_PREFETCH_POLLED:
-		chip->legacy.read_buf = omap_read_buf_pref;
-		chip->legacy.write_buf = omap_write_buf_pref;
+		info->data_in = omap_nand_data_in_pref;
+		info->data_out = omap_nand_data_out_pref;
 		break;
 
 	case NAND_OMAP_POLLED:
@@ -2017,8 +1864,9 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 					err);
 				return err;
 			}
-			chip->legacy.read_buf = omap_read_buf_dma_pref;
-			chip->legacy.write_buf = omap_write_buf_dma_pref;
+
+			info->data_in = omap_nand_data_in_dma_pref;
+			info->data_out = omap_nand_data_out_dma_pref;
 		}
 		break;
 
@@ -2049,9 +1897,8 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 			return err;
 		}
 
-		chip->legacy.read_buf = omap_read_buf_irq_pref;
-		chip->legacy.write_buf = omap_write_buf_irq_pref;
-
+		info->data_in = omap_nand_data_in_irq_pref;
+		info->data_out = omap_nand_data_out_irq_pref;
 		break;
 
 	default:
@@ -2217,8 +2064,105 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 	return 0;
 }
 
+static void omap_nand_data_in(struct nand_chip *chip, void *buf,
+			      unsigned int len, bool force_8bit)
+{
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	u32 alignment = ((uintptr_t)buf | len) & 3;
+
+	if (force_8bit || (alignment & 1))
+		ioread8_rep(info->fifo, buf, len);
+	else if (alignment & 3)
+		ioread16_rep(info->fifo, buf, len >> 1);
+	else
+		ioread32_rep(info->fifo, buf, len >> 2);
+}
+
+static void omap_nand_data_out(struct nand_chip *chip,
+			       const void *buf, unsigned int len,
+			       bool force_8bit)
+{
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	u32 alignment = ((uintptr_t)buf | len) & 3;
+
+	if (force_8bit || (alignment & 1))
+		iowrite8_rep(info->fifo, buf, len);
+	else if (alignment & 3)
+		iowrite16_rep(info->fifo, buf, len >> 1);
+	else
+		iowrite32_rep(info->fifo, buf, len >> 2);
+}
+
+static int omap_nand_exec_instr(struct nand_chip *chip,
+				const struct nand_op_instr *instr)
+{
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	unsigned int i;
+	int ret;
+
+	switch (instr->type) {
+	case NAND_OP_CMD_INSTR:
+		iowrite8(instr->ctx.cmd.opcode,
+			 info->reg.gpmc_nand_command);
+		break;
+
+	case NAND_OP_ADDR_INSTR:
+		for (i = 0; i < instr->ctx.addr.naddrs; i++) {
+			iowrite8(instr->ctx.addr.addrs[i],
+				 info->reg.gpmc_nand_address);
+		}
+		break;
+
+	case NAND_OP_DATA_IN_INSTR:
+		info->data_in(chip, instr->ctx.data.buf.in,
+			      instr->ctx.data.len,
+			      instr->ctx.data.force_8bit);
+		break;
+
+	case NAND_OP_DATA_OUT_INSTR:
+		info->data_out(chip, instr->ctx.data.buf.out,
+			       instr->ctx.data.len,
+			       instr->ctx.data.force_8bit);
+		break;
+
+	case NAND_OP_WAITRDY_INSTR:
+		ret = info->ready_gpiod ?
+			nand_gpio_waitrdy(chip, info->ready_gpiod, instr->ctx.waitrdy.timeout_ms) :
+			nand_soft_waitrdy(chip, instr->ctx.waitrdy.timeout_ms);
+		if (ret)
+			return ret;
+		break;
+	}
+
+	if (instr->delay_ns)
+		ndelay(instr->delay_ns);
+
+	return 0;
+}
+
+static int omap_nand_exec_op(struct nand_chip *chip,
+			     const struct nand_operation *op,
+			     bool check_only)
+{
+	unsigned int i;
+
+	if (check_only)
+		return 0;
+
+	for (i = 0; i < op->ninstrs; i++) {
+		int ret;
+
+		ret = omap_nand_exec_instr(chip, &op->instrs[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static const struct nand_controller_ops omap_nand_controller_ops = {
 	.attach_chip = omap_nand_attach_chip,
+	.exec_op = omap_nand_exec_op,
 };
 
 /* Shared among all NAND instances to synchronize access to the ECC Engine */
@@ -2233,6 +2177,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 	int				err;
 	struct resource			*res;
 	struct device			*dev = &pdev->dev;
+	void __iomem *vaddr;
 
 	info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info),
 				GFP_KERNEL);
@@ -2266,10 +2211,11 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	nand_chip->legacy.IO_ADDR_R = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(nand_chip->legacy.IO_ADDR_R))
-		return PTR_ERR(nand_chip->legacy.IO_ADDR_R);
+	vaddr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(vaddr))
+		return PTR_ERR(vaddr);
 
+	info->fifo = vaddr;
 	info->phys_base = res->start;
 
 	if (!omap_gpmc_controller_initialized) {
@@ -2280,9 +2226,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 
 	nand_chip->controller = &omap_gpmc_controller;
 
-	nand_chip->legacy.IO_ADDR_W = nand_chip->legacy.IO_ADDR_R;
-	nand_chip->legacy.cmd_ctrl  = omap_hwcontrol;
-
 	info->ready_gpiod = devm_gpiod_get_optional(&pdev->dev, "rb",
 						    GPIOD_IN);
 	if (IS_ERR(info->ready_gpiod)) {
@@ -2290,27 +2233,16 @@ static int omap_nand_probe(struct platform_device *pdev)
 		return PTR_ERR(info->ready_gpiod);
 	}
 
-	/*
-	 * If RDY/BSY line is connected to OMAP then use the omap ready
-	 * function and the generic nand_wait function which reads the status
-	 * register after monitoring the RDY/BSY line. Otherwise use a standard
-	 * chip delay which is slightly more than tR (AC Timing) of the NAND
-	 * device and read status register until you get a failure or success
-	 */
-	if (info->ready_gpiod) {
-		nand_chip->legacy.dev_ready = omap_dev_ready;
-		nand_chip->legacy.chip_delay = 0;
-	} else {
-		nand_chip->legacy.waitfunc = omap_wait;
-		nand_chip->legacy.chip_delay = 50;
-	}
-
 	if (info->flash_bbt)
 		nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
 
 	/* scan NAND device connected to chip controller */
 	nand_chip->options |= info->devsize & NAND_BUSWIDTH_16;
 
+	/* default operations */
+	info->data_in = omap_nand_data_in;
+	info->data_out = omap_nand_data_out;
+
 	err = nand_scan(nand_chip, 1);
 	if (err)
 		goto return_error;
-- 
2.17.1

[PATCH v2 3/6] mtd: rawnand: omap2: move to exec_op interface

[Roger Quadros]

Stop using legacy interface and move to the exec_op interface.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/omap2.c | 490 +++++++++++++++--------------------
 1 file changed, 211 insertions(+), 279 deletions(-)

diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index b26d4947af02..224c91282c87 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -19,7 +19,7 @@
 #include <linux/mtd/rawnand.h>
 #include <linux/mtd/partitions.h>
 #include <linux/omap-dma.h>
-#include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
@@ -164,6 +164,7 @@ struct omap_nand_info {
 	u_char				*buf;
 	int					buf_len;
 	/* Interface to GPMC */
+	void __iomem			*fifo;
 	struct gpmc_nand_regs		reg;
 	struct gpmc_nand_ops		*ops;
 	bool				flash_bbt;
@@ -175,6 +176,11 @@ struct omap_nand_info {
 	unsigned int			nsteps_per_eccpg;
 	unsigned int			eccpg_size;
 	unsigned int			eccpg_bytes;
+	void (*data_in)(struct nand_chip *chip, void *buf,
+			unsigned int len, bool force_8bit);
+	void (*data_out)(struct nand_chip *chip,
+			 const void *buf, unsigned int len,
+			 bool force_8bit);
 };
 
 static inline struct omap_nand_info *mtd_to_omap(struct mtd_info *mtd)
@@ -182,6 +188,13 @@ static inline struct omap_nand_info *mtd_to_omap(struct mtd_info *mtd)
 	return container_of(mtd_to_nand(mtd), struct omap_nand_info, nand);
 }
 
+static void omap_nand_data_in(struct nand_chip *chip, void *buf,
+			      unsigned int len, bool force_8bit);
+
+static void omap_nand_data_out(struct nand_chip *chip,
+			       const void *buf, unsigned int len,
+			       bool force_8bit);
+
 /**
  * omap_prefetch_enable - configures and starts prefetch transfer
  * @cs: cs (chip select) number
@@ -241,169 +254,70 @@ static int omap_prefetch_reset(int cs, struct omap_nand_info *info)
 }
 
 /**
- * omap_hwcontrol - hardware specific access to control-lines
- * @chip: NAND chip object
- * @cmd: command to device
- * @ctrl:
- * NAND_NCE: bit 0 -> don't care
- * NAND_CLE: bit 1 -> Command Latch
- * NAND_ALE: bit 2 -> Address Latch
- *
- * NOTE: boards may use different bits for these!!
+ * omap_nand_data_in_pref - NAND data in using prefetch engine
  */
-static void omap_hwcontrol(struct nand_chip *chip, int cmd, unsigned int ctrl)
+static void omap_nand_data_in_pref(struct nand_chip *chip, void *buf,
+				   unsigned int len, bool force_8bit)
 {
 	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
-
-	if (cmd != NAND_CMD_NONE) {
-		if (ctrl & NAND_CLE)
-			writeb(cmd, info->reg.gpmc_nand_command);
-
-		else if (ctrl & NAND_ALE)
-			writeb(cmd, info->reg.gpmc_nand_address);
-
-		else /* NAND_NCE */
-			writeb(cmd, info->reg.gpmc_nand_data);
-	}
-}
-
-/**
- * omap_read_buf8 - read data from NAND controller into buffer
- * @mtd: MTD device structure
- * @buf: buffer to store date
- * @len: number of bytes to read
- */
-static void omap_read_buf8(struct mtd_info *mtd, u_char *buf, int len)
-{
-	struct nand_chip *nand = mtd_to_nand(mtd);
-
-	ioread8_rep(nand->legacy.IO_ADDR_R, buf, len);
-}
-
-/**
- * omap_write_buf8 - write buffer to NAND controller
- * @mtd: MTD device structure
- * @buf: data buffer
- * @len: number of bytes to write
- */
-static void omap_write_buf8(struct mtd_info *mtd, const u_char *buf, int len)
-{
-	struct omap_nand_info *info = mtd_to_omap(mtd);
-	u_char *p = (u_char *)buf;
-	bool status;
-
-	while (len--) {
-		iowrite8(*p++, info->nand.legacy.IO_ADDR_W);
-		/* wait until buffer is available for write */
-		do {
-			status = info->ops->nand_writebuffer_empty();
-		} while (!status);
-	}
-}
-
-/**
- * omap_read_buf16 - read data from NAND controller into buffer
- * @mtd: MTD device structure
- * @buf: buffer to store date
- * @len: number of bytes to read
- */
-static void omap_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
-{
-	struct nand_chip *nand = mtd_to_nand(mtd);
-
-	ioread16_rep(nand->legacy.IO_ADDR_R, buf, len / 2);
-}
-
-/**
- * omap_write_buf16 - write buffer to NAND controller
- * @mtd: MTD device structure
- * @buf: data buffer
- * @len: number of bytes to write
- */
-static void omap_write_buf16(struct mtd_info *mtd, const u_char * buf, int len)
-{
-	struct omap_nand_info *info = mtd_to_omap(mtd);
-	u16 *p = (u16 *) buf;
-	bool status;
-	/* FIXME try bursts of writesw() or DMA ... */
-	len >>= 1;
-
-	while (len--) {
-		iowrite16(*p++, info->nand.legacy.IO_ADDR_W);
-		/* wait until buffer is available for write */
-		do {
-			status = info->ops->nand_writebuffer_empty();
-		} while (!status);
-	}
-}
-
-/**
- * omap_read_buf_pref - read data from NAND controller into buffer
- * @chip: NAND chip object
- * @buf: buffer to store date
- * @len: number of bytes to read
- */
-static void omap_read_buf_pref(struct nand_chip *chip, u_char *buf, int len)
-{
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct omap_nand_info *info = mtd_to_omap(mtd);
 	uint32_t r_count = 0;
 	int ret = 0;
 	u32 *p = (u32 *)buf;
+	unsigned int pref_len;
 
-	/* take care of subpage reads */
-	if (len % 4) {
-		if (info->nand.options & NAND_BUSWIDTH_16)
-			omap_read_buf16(mtd, buf, len % 4);
-		else
-			omap_read_buf8(mtd, buf, len % 4);
-		p = (u32 *) (buf + len % 4);
-		len -= len % 4;
+	if (force_8bit) {
+		omap_nand_data_in(chip, buf, len, force_8bit);
+		return;
 	}
 
+	/* read 32-bit words using prefetch and remaining bytes normally */
+
 	/* configure and start prefetch transfer */
+	pref_len = len - (len & 3);
 	ret = omap_prefetch_enable(info->gpmc_cs,
-			PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x0, info);
+			PREFETCH_FIFOTHRESHOLD_MAX, 0x0, pref_len, 0x0, info);
 	if (ret) {
-		/* PFPW engine is busy, use cpu copy method */
-		if (info->nand.options & NAND_BUSWIDTH_16)
-			omap_read_buf16(mtd, (u_char *)p, len);
-		else
-			omap_read_buf8(mtd, (u_char *)p, len);
+		/* prefetch engine is busy, use CPU copy method */
+		omap_nand_data_in(chip, buf, len, false);
 	} else {
 		do {
 			r_count = readl(info->reg.gpmc_prefetch_status);
 			r_count = PREFETCH_STATUS_FIFO_CNT(r_count);
 			r_count = r_count >> 2;
-			ioread32_rep(info->nand.legacy.IO_ADDR_R, p, r_count);
+			ioread32_rep(info->fifo, p, r_count);
 			p += r_count;
-			len -= r_count << 2;
-		} while (len);
-		/* disable and stop the PFPW engine */
+			pref_len -= r_count << 2;
+		} while (pref_len);
+		/* disable and stop the Prefetch engine */
 		omap_prefetch_reset(info->gpmc_cs, info);
+		/* fetch any remaining bytes */
+		if (len & 3)
+			omap_nand_data_in(chip, p, len & 3, false);
 	}
 }
 
 /**
- * omap_write_buf_pref - write buffer to NAND controller
- * @chip: NAND chip object
- * @buf: data buffer
- * @len: number of bytes to write
+ * omap_nand_data_out_pref - NAND data out using Write Posting engine
  */
-static void omap_write_buf_pref(struct nand_chip *chip, const u_char *buf,
-				int len)
+static void omap_nand_data_out_pref(struct nand_chip *chip,
+				    const void *buf, unsigned int len,
+				    bool force_8bit)
 {
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
 	uint32_t w_count = 0;
 	int i = 0, ret = 0;
 	u16 *p = (u16 *)buf;
 	unsigned long tim, limit;
 	u32 val;
 
+	if (force_8bit) {
+		omap_nand_data_out(chip, buf, len, force_8bit);
+		return;
+	}
+
 	/* take care of subpage writes */
 	if (len % 2 != 0) {
-		writeb(*buf, info->nand.legacy.IO_ADDR_W);
+		writeb(*(u8 *)buf, info->fifo);
 		p = (u16 *)(buf + 1);
 		len--;
 	}
@@ -412,18 +326,15 @@ static void omap_write_buf_pref(struct nand_chip *chip, const u_char *buf,
 	ret = omap_prefetch_enable(info->gpmc_cs,
 			PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1, info);
 	if (ret) {
-		/* PFPW engine is busy, use cpu copy method */
-		if (info->nand.options & NAND_BUSWIDTH_16)
-			omap_write_buf16(mtd, (u_char *)p, len);
-		else
-			omap_write_buf8(mtd, (u_char *)p, len);
+		/* write posting engine is busy, use CPU copy method */
+		omap_nand_data_out(chip, buf, len, false);
 	} else {
 		while (len) {
 			w_count = readl(info->reg.gpmc_prefetch_status);
 			w_count = PREFETCH_STATUS_FIFO_CNT(w_count);
 			w_count = w_count >> 1;
 			for (i = 0; (i < w_count) && len; i++, len -= 2)
-				iowrite16(*p++, info->nand.legacy.IO_ADDR_W);
+				iowrite16(*p++, info->fifo);
 		}
 		/* wait for data to flushed-out before reset the prefetch */
 		tim = 0;
@@ -451,15 +362,16 @@ static void omap_nand_dma_callback(void *data)
 
 /*
  * omap_nand_dma_transfer: configure and start dma transfer
- * @mtd: MTD device structure
+ * @chip: nand chip structure
  * @addr: virtual address in RAM of source/destination
  * @len: number of data bytes to be transferred
  * @is_write: flag for read/write operation
  */
-static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
-					unsigned int len, int is_write)
+static inline int omap_nand_dma_transfer(struct nand_chip *chip,
+					 const void *addr, unsigned int len,
+					 int is_write)
 {
-	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
 	struct dma_async_tx_descriptor *tx;
 	enum dma_data_direction dir = is_write ? DMA_TO_DEVICE :
 							DMA_FROM_DEVICE;
@@ -521,49 +433,41 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
 out_copy_unmap:
 	dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
 out_copy:
-	if (info->nand.options & NAND_BUSWIDTH_16)
-		is_write == 0 ? omap_read_buf16(mtd, (u_char *) addr, len)
-			: omap_write_buf16(mtd, (u_char *) addr, len);
-	else
-		is_write == 0 ? omap_read_buf8(mtd, (u_char *) addr, len)
-			: omap_write_buf8(mtd, (u_char *) addr, len);
+	is_write == 0 ? omap_nand_data_in(chip, (void *)addr, len, false)
+		      : omap_nand_data_out(chip, addr, len, false);
+
 	return 0;
 }
 
 /**
- * omap_read_buf_dma_pref - read data from NAND controller into buffer
- * @chip: NAND chip object
- * @buf: buffer to store date
- * @len: number of bytes to read
+ * omap_nand_data_in_dma_pref - NAND data in using DMA and Prefetch
  */
-static void omap_read_buf_dma_pref(struct nand_chip *chip, u_char *buf,
-				   int len)
+static void omap_nand_data_in_dma_pref(struct nand_chip *chip, void *buf,
+				       unsigned int len, bool force_8bit)
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
 	if (len <= mtd->oobsize)
-		omap_read_buf_pref(chip, buf, len);
+		omap_nand_data_in_pref(chip, buf, len, false);
 	else
 		/* start transfer in DMA mode */
-		omap_nand_dma_transfer(mtd, buf, len, 0x0);
+		omap_nand_dma_transfer(chip, buf, len, 0x0);
 }
 
 /**
- * omap_write_buf_dma_pref - write buffer to NAND controller
- * @chip: NAND chip object
- * @buf: data buffer
- * @len: number of bytes to write
+ * omap_nand_data_out_dma_pref - NAND data out using DMA and write posting
  */
-static void omap_write_buf_dma_pref(struct nand_chip *chip, const u_char *buf,
-				    int len)
+static void omap_nand_data_out_dma_pref(struct nand_chip *chip,
+					const void *buf, unsigned int len,
+					bool force_8bit)
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
 	if (len <= mtd->oobsize)
-		omap_write_buf_pref(chip, buf, len);
+		omap_nand_data_out_pref(chip, buf, len, false);
 	else
 		/* start transfer in DMA mode */
-		omap_nand_dma_transfer(mtd, (u_char *)buf, len, 0x1);
+		omap_nand_dma_transfer(chip, buf, len, 0x1);
 }
 
 /*
@@ -587,13 +491,13 @@ static irqreturn_t omap_nand_irq(int this_irq, void *dev)
 			bytes = info->buf_len;
 		else if (!info->buf_len)
 			bytes = 0;
-		iowrite32_rep(info->nand.legacy.IO_ADDR_W, (u32 *)info->buf,
+		iowrite32_rep(info->fifo, (u32 *)info->buf,
 			      bytes >> 2);
 		info->buf = info->buf + bytes;
 		info->buf_len -= bytes;
 
 	} else {
-		ioread32_rep(info->nand.legacy.IO_ADDR_R, (u32 *)info->buf,
+		ioread32_rep(info->fifo, (u32 *)info->buf,
 			     bytes >> 2);
 		info->buf = info->buf + bytes;
 
@@ -613,20 +517,17 @@ static irqreturn_t omap_nand_irq(int this_irq, void *dev)
 }
 
 /*
- * omap_read_buf_irq_pref - read data from NAND controller into buffer
- * @chip: NAND chip object
- * @buf: buffer to store date
- * @len: number of bytes to read
+ * omap_nand_data_in_irq_pref - NAND data in using Prefetch and IRQ
  */
-static void omap_read_buf_irq_pref(struct nand_chip *chip, u_char *buf,
-				   int len)
+static void omap_nand_data_in_irq_pref(struct nand_chip *chip, void *buf,
+				       unsigned int len, bool force_8bit)
 {
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	struct mtd_info *mtd = nand_to_mtd(&info->nand);
 	int ret = 0;
 
-	if (len <= mtd->oobsize) {
-		omap_read_buf_pref(chip, buf, len);
+	if (len <= mtd->oobsize || force_8bit) {
+		omap_nand_data_in(chip, buf, len, force_8bit);
 		return;
 	}
 
@@ -637,9 +538,11 @@ static void omap_read_buf_irq_pref(struct nand_chip *chip, u_char *buf,
 	/*  configure and start prefetch transfer */
 	ret = omap_prefetch_enable(info->gpmc_cs,
 			PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0, info);
-	if (ret)
+	if (ret) {
 		/* PFPW engine is busy, use cpu copy method */
-		goto out_copy;
+		omap_nand_data_in(chip, buf, len, false);
+		return;
+	}
 
 	info->buf_len = len;
 
@@ -652,31 +555,23 @@ static void omap_read_buf_irq_pref(struct nand_chip *chip, u_char *buf,
 	/* disable and stop the PFPW engine */
 	omap_prefetch_reset(info->gpmc_cs, info);
 	return;
-
-out_copy:
-	if (info->nand.options & NAND_BUSWIDTH_16)
-		omap_read_buf16(mtd, buf, len);
-	else
-		omap_read_buf8(mtd, buf, len);
 }
 
 /*
- * omap_write_buf_irq_pref - write buffer to NAND controller
- * @chip: NAND chip object
- * @buf: data buffer
- * @len: number of bytes to write
+ * omap_nand_data_out_irq_pref - NAND out using write posting and IRQ
  */
-static void omap_write_buf_irq_pref(struct nand_chip *chip, const u_char *buf,
-				    int len)
+static void omap_nand_data_out_irq_pref(struct nand_chip *chip,
+					const void *buf, unsigned int len,
+					bool force_8bit)
 {
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct omap_nand_info *info = mtd_to_omap(mtd);
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	struct mtd_info *mtd = nand_to_mtd(&info->nand);
 	int ret = 0;
 	unsigned long tim, limit;
 	u32 val;
 
-	if (len <= mtd->oobsize) {
-		omap_write_buf_pref(chip, buf, len);
+	if (len <= mtd->oobsize || force_8bit) {
+		omap_nand_data_out(chip, buf, len, force_8bit);
 		return;
 	}
 
@@ -687,9 +582,11 @@ static void omap_write_buf_irq_pref(struct nand_chip *chip, const u_char *buf,
 	/* configure and start prefetch transfer : size=24 */
 	ret = omap_prefetch_enable(info->gpmc_cs,
 		(PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1, info);
-	if (ret)
+	if (ret) {
 		/* PFPW engine is busy, use cpu copy method */
-		goto out_copy;
+		omap_nand_data_out(chip, buf, len, false);
+		return;
+	}
 
 	info->buf_len = len;
 
@@ -711,12 +608,6 @@ static void omap_write_buf_irq_pref(struct nand_chip *chip, const u_char *buf,
 	/* disable and stop the PFPW engine */
 	omap_prefetch_reset(info->gpmc_cs, info);
 	return;
-
-out_copy:
-	if (info->nand.options & NAND_BUSWIDTH_16)
-		omap_write_buf16(mtd, buf, len);
-	else
-		omap_write_buf8(mtd, buf, len);
 }
 
 /**
@@ -981,50 +872,6 @@ static void omap_enable_hwecc(struct nand_chip *chip, int mode)
 	writel(val, info->reg.gpmc_ecc_config);
 }
 
-/**
- * omap_wait - wait until the command is done
- * @this: NAND Chip structure
- *
- * Wait function is called during Program and erase operations and
- * the way it is called from MTD layer, we should wait till the NAND
- * chip is ready after the programming/erase operation has completed.
- *
- * Erase can take up to 400ms and program up to 20ms according to
- * general NAND and SmartMedia specs
- */
-static int omap_wait(struct nand_chip *this)
-{
-	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(this));
-	unsigned long timeo = jiffies;
-	int status;
-
-	timeo += msecs_to_jiffies(400);
-
-	writeb(NAND_CMD_STATUS & 0xFF, info->reg.gpmc_nand_command);
-	while (time_before(jiffies, timeo)) {
-		status = readb(info->reg.gpmc_nand_data);
-		if (status & NAND_STATUS_READY)
-			break;
-		cond_resched();
-	}
-
-	status = readb(info->reg.gpmc_nand_data);
-	return status;
-}
-
-/**
- * omap_dev_ready - checks the NAND Ready GPIO line
- * @chip: NAND chip object
- *
- * Returns true if ready and false if busy.
- */
-static int omap_dev_ready(struct nand_chip *chip)
-{
-	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
-
-	return gpiod_get_value(info->ready_gpiod);
-}
-
 /**
  * omap_enable_hwecc_bch - Program GPMC to perform BCH ECC calculation
  * @chip: NAND chip object
@@ -1543,8 +1390,8 @@ static int omap_write_page_bch(struct nand_chip *chip, const uint8_t *buf,
 		chip->ecc.hwctl(chip, NAND_ECC_WRITE);
 
 		/* Write data */
-		chip->legacy.write_buf(chip, buf + (eccpg * info->eccpg_size),
-				       info->eccpg_size);
+		info->data_out(chip, buf + (eccpg * info->eccpg_size),
+			       info->eccpg_size, false);
 
 		/* Update ecc vector from GPMC result registers */
 		ret = omap_calculate_ecc_bch_multi(mtd,
@@ -1562,7 +1409,7 @@ static int omap_write_page_bch(struct nand_chip *chip, const uint8_t *buf,
 	}
 
 	/* Write ecc vector to OOB area */
-	chip->legacy.write_buf(chip, chip->oob_poi, mtd->oobsize);
+	info->data_out(chip, chip->oob_poi, mtd->oobsize, false);
 
 	return nand_prog_page_end_op(chip);
 }
@@ -1607,8 +1454,8 @@ static int omap_write_subpage_bch(struct nand_chip *chip, u32 offset,
 		chip->ecc.hwctl(chip, NAND_ECC_WRITE);
 
 		/* Write data */
-		chip->legacy.write_buf(chip, buf + (eccpg * info->eccpg_size),
-				       info->eccpg_size);
+		info->data_out(chip, buf + (eccpg * info->eccpg_size),
+			       info->eccpg_size, false);
 
 		for (step = 0; step < info->nsteps_per_eccpg; step++) {
 			unsigned int base_step = eccpg * info->nsteps_per_eccpg;
@@ -1641,7 +1488,7 @@ static int omap_write_subpage_bch(struct nand_chip *chip, u32 offset,
 	}
 
 	/* write OOB buffer to NAND device */
-	chip->legacy.write_buf(chip, chip->oob_poi, mtd->oobsize);
+	info->data_out(chip, chip->oob_poi, mtd->oobsize, false);
 
 	return nand_prog_page_end_op(chip);
 }
@@ -1984,8 +1831,8 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 	/* Re-populate low-level callbacks based on xfer modes */
 	switch (info->xfer_type) {
 	case NAND_OMAP_PREFETCH_POLLED:
-		chip->legacy.read_buf = omap_read_buf_pref;
-		chip->legacy.write_buf = omap_write_buf_pref;
+		info->data_in = omap_nand_data_in_pref;
+		info->data_out = omap_nand_data_out_pref;
 		break;
 
 	case NAND_OMAP_POLLED:
@@ -2017,8 +1864,9 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 					err);
 				return err;
 			}
-			chip->legacy.read_buf = omap_read_buf_dma_pref;
-			chip->legacy.write_buf = omap_write_buf_dma_pref;
+
+			info->data_in = omap_nand_data_in_dma_pref;
+			info->data_out = omap_nand_data_out_dma_pref;
 		}
 		break;
 
@@ -2049,9 +1897,8 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 			return err;
 		}
 
-		chip->legacy.read_buf = omap_read_buf_irq_pref;
-		chip->legacy.write_buf = omap_write_buf_irq_pref;
-
+		info->data_in = omap_nand_data_in_irq_pref;
+		info->data_out = omap_nand_data_out_irq_pref;
 		break;
 
 	default:
@@ -2217,8 +2064,105 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 	return 0;
 }
 
+static void omap_nand_data_in(struct nand_chip *chip, void *buf,
+			      unsigned int len, bool force_8bit)
+{
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	u32 alignment = ((uintptr_t)buf | len) & 3;
+
+	if (force_8bit || (alignment & 1))
+		ioread8_rep(info->fifo, buf, len);
+	else if (alignment & 3)
+		ioread16_rep(info->fifo, buf, len >> 1);
+	else
+		ioread32_rep(info->fifo, buf, len >> 2);
+}
+
+static void omap_nand_data_out(struct nand_chip *chip,
+			       const void *buf, unsigned int len,
+			       bool force_8bit)
+{
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	u32 alignment = ((uintptr_t)buf | len) & 3;
+
+	if (force_8bit || (alignment & 1))
+		iowrite8_rep(info->fifo, buf, len);
+	else if (alignment & 3)
+		iowrite16_rep(info->fifo, buf, len >> 1);
+	else
+		iowrite32_rep(info->fifo, buf, len >> 2);
+}
+
+static int omap_nand_exec_instr(struct nand_chip *chip,
+				const struct nand_op_instr *instr)
+{
+	struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
+	unsigned int i;
+	int ret;
+
+	switch (instr->type) {
+	case NAND_OP_CMD_INSTR:
+		iowrite8(instr->ctx.cmd.opcode,
+			 info->reg.gpmc_nand_command);
+		break;
+
+	case NAND_OP_ADDR_INSTR:
+		for (i = 0; i < instr->ctx.addr.naddrs; i++) {
+			iowrite8(instr->ctx.addr.addrs[i],
+				 info->reg.gpmc_nand_address);
+		}
+		break;
+
+	case NAND_OP_DATA_IN_INSTR:
+		info->data_in(chip, instr->ctx.data.buf.in,
+			      instr->ctx.data.len,
+			      instr->ctx.data.force_8bit);
+		break;
+
+	case NAND_OP_DATA_OUT_INSTR:
+		info->data_out(chip, instr->ctx.data.buf.out,
+			       instr->ctx.data.len,
+			       instr->ctx.data.force_8bit);
+		break;
+
+	case NAND_OP_WAITRDY_INSTR:
+		ret = info->ready_gpiod ?
+			nand_gpio_waitrdy(chip, info->ready_gpiod, instr->ctx.waitrdy.timeout_ms) :
+			nand_soft_waitrdy(chip, instr->ctx.waitrdy.timeout_ms);
+		if (ret)
+			return ret;
+		break;
+	}
+
+	if (instr->delay_ns)
+		ndelay(instr->delay_ns);
+
+	return 0;
+}
+
+static int omap_nand_exec_op(struct nand_chip *chip,
+			     const struct nand_operation *op,
+			     bool check_only)
+{
+	unsigned int i;
+
+	if (check_only)
+		return 0;
+
+	for (i = 0; i < op->ninstrs; i++) {
+		int ret;
+
+		ret = omap_nand_exec_instr(chip, &op->instrs[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static const struct nand_controller_ops omap_nand_controller_ops = {
 	.attach_chip = omap_nand_attach_chip,
+	.exec_op = omap_nand_exec_op,
 };
 
 /* Shared among all NAND instances to synchronize access to the ECC Engine */
@@ -2233,6 +2177,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 	int				err;
 	struct resource			*res;
 	struct device			*dev = &pdev->dev;
+	void __iomem *vaddr;
 
 	info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info),
 				GFP_KERNEL);
@@ -2266,10 +2211,11 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	nand_chip->legacy.IO_ADDR_R = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(nand_chip->legacy.IO_ADDR_R))
-		return PTR_ERR(nand_chip->legacy.IO_ADDR_R);
+	vaddr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(vaddr))
+		return PTR_ERR(vaddr);
 
+	info->fifo = vaddr;
 	info->phys_base = res->start;
 
 	if (!omap_gpmc_controller_initialized) {
@@ -2280,9 +2226,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 
 	nand_chip->controller = &omap_gpmc_controller;
 
-	nand_chip->legacy.IO_ADDR_W = nand_chip->legacy.IO_ADDR_R;
-	nand_chip->legacy.cmd_ctrl  = omap_hwcontrol;
-
 	info->ready_gpiod = devm_gpiod_get_optional(&pdev->dev, "rb",
 						    GPIOD_IN);
 	if (IS_ERR(info->ready_gpiod)) {
@@ -2290,27 +2233,16 @@ static int omap_nand_probe(struct platform_device *pdev)
 		return PTR_ERR(info->ready_gpiod);
 	}
 
-	/*
-	 * If RDY/BSY line is connected to OMAP then use the omap ready
-	 * function and the generic nand_wait function which reads the status
-	 * register after monitoring the RDY/BSY line. Otherwise use a standard
-	 * chip delay which is slightly more than tR (AC Timing) of the NAND
-	 * device and read status register until you get a failure or success
-	 */
-	if (info->ready_gpiod) {
-		nand_chip->legacy.dev_ready = omap_dev_ready;
-		nand_chip->legacy.chip_delay = 0;
-	} else {
-		nand_chip->legacy.waitfunc = omap_wait;
-		nand_chip->legacy.chip_delay = 50;
-	}
-
 	if (info->flash_bbt)
 		nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
 
 	/* scan NAND device connected to chip controller */
 	nand_chip->options |= info->devsize & NAND_BUSWIDTH_16;
 
+	/* default operations */
+	info->data_in = omap_nand_data_in;
+	info->data_out = omap_nand_data_out;
+
 	err = nand_scan(nand_chip, 1);
 	if (err)
 		goto return_error;
-- 
2.17.1


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[PATCH v2 4/6] mtd: rawnand: omap2: Add compatible for AM64 SoC

[Roger Quadros]

AM64 SoC contains the GPMC NAND controller. Add compatible for it.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/omap2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index 224c91282c87..0c7ee26171ad 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -2286,6 +2286,7 @@ static int omap_nand_remove(struct platform_device *pdev)
 
 static const struct of_device_id omap_nand_ids[] = {
 	{ .compatible = "ti,omap2-nand", },
+	{ .compatible = "ti,am64-nand", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, omap_nand_ids);
-- 
2.17.1

[PATCH v2 4/6] mtd: rawnand: omap2: Add compatible for AM64 SoC

[Roger Quadros]

AM64 SoC contains the GPMC NAND controller. Add compatible for it.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/omap2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index 224c91282c87..0c7ee26171ad 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -2286,6 +2286,7 @@ static int omap_nand_remove(struct platform_device *pdev)
 
 static const struct of_device_id omap_nand_ids[] = {
 	{ .compatible = "ti,omap2-nand", },
+	{ .compatible = "ti,am64-nand", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, omap_nand_ids);
-- 
2.17.1


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[PATCH v2 5/6] mtd: rawnand: omap2: fix force_8bit flag behaviour for DMA mode

[Roger Quadros]

In DMA mode we were not considering the force_8bit flag.

Fix it by using regular non-DMA 8-bit I/O if force_8bit flag is set.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/omap2.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index 0c7ee26171ad..2b58ddea3b01 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -447,6 +447,11 @@ static void omap_nand_data_in_dma_pref(struct nand_chip *chip, void *buf,
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
+	if (force_8bit) {
+		omap_nand_data_in(chip, buf, len, force_8bit);
+		return;
+	}
+
 	if (len <= mtd->oobsize)
 		omap_nand_data_in_pref(chip, buf, len, false);
 	else
@@ -463,6 +468,11 @@ static void omap_nand_data_out_dma_pref(struct nand_chip *chip,
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
+	if (force_8bit) {
+		omap_nand_data_out(chip, buf, len, force_8bit);
+		return;
+	}
+
 	if (len <= mtd->oobsize)
 		omap_nand_data_out_pref(chip, buf, len, false);
 	else
-- 
2.17.1

[PATCH v2 5/6] mtd: rawnand: omap2: fix force_8bit flag behaviour for DMA mode

[Roger Quadros]

In DMA mode we were not considering the force_8bit flag.

Fix it by using regular non-DMA 8-bit I/O if force_8bit flag is set.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/omap2.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index 0c7ee26171ad..2b58ddea3b01 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -447,6 +447,11 @@ static void omap_nand_data_in_dma_pref(struct nand_chip *chip, void *buf,
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
+	if (force_8bit) {
+		omap_nand_data_in(chip, buf, len, force_8bit);
+		return;
+	}
+
 	if (len <= mtd->oobsize)
 		omap_nand_data_in_pref(chip, buf, len, false);
 	else
@@ -463,6 +468,11 @@ static void omap_nand_data_out_dma_pref(struct nand_chip *chip,
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
+	if (force_8bit) {
+		omap_nand_data_out(chip, buf, len, force_8bit);
+		return;
+	}
+
 	if (len <= mtd->oobsize)
 		omap_nand_data_out_pref(chip, buf, len, false);
 	else
-- 
2.17.1


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[PATCH v2 6/6] mtd: rawnand: omap2: drop unused variable

[Roger Quadros]

devsize is not used anywhere in code. Drop it.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/omap2.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index 2b58ddea3b01..cc61f4858a3b 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -148,7 +148,6 @@ struct omap_nand_info {
 	int				gpmc_cs;
 	bool				dev_ready;
 	enum nand_io			xfer_type;
-	int				devsize;
 	enum omap_ecc			ecc_opt;
 	struct device_node		*elm_of_node;
 
@@ -2246,9 +2245,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 	if (info->flash_bbt)
 		nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
 
-	/* scan NAND device connected to chip controller */
-	nand_chip->options |= info->devsize & NAND_BUSWIDTH_16;
-
 	/* default operations */
 	info->data_in = omap_nand_data_in;
 	info->data_out = omap_nand_data_out;
-- 
2.17.1

[PATCH v2 6/6] mtd: rawnand: omap2: drop unused variable

[Roger Quadros]

devsize is not used anywhere in code. Drop it.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 drivers/mtd/nand/raw/omap2.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index 2b58ddea3b01..cc61f4858a3b 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -148,7 +148,6 @@ struct omap_nand_info {
 	int				gpmc_cs;
 	bool				dev_ready;
 	enum nand_io			xfer_type;
-	int				devsize;
 	enum omap_ecc			ecc_opt;
 	struct device_node		*elm_of_node;
 
@@ -2246,9 +2245,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 	if (info->flash_bbt)
 		nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
 
-	/* scan NAND device connected to chip controller */
-	nand_chip->options |= info->devsize & NAND_BUSWIDTH_16;
-
 	/* default operations */
 	info->data_in = omap_nand_data_in;
 	info->data_out = omap_nand_data_out;
-- 
2.17.1


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Re: [PATCH v2 6/6] mtd: rawnand: omap2: drop unused variable

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:58 UTC, Roger Quadros wrote:
> devsize is not used anywhere in code. Drop it.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

Re: [PATCH v2 6/6] mtd: rawnand: omap2: drop unused variable

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:58 UTC, Roger Quadros wrote:
> devsize is not used anywhere in code. Drop it.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

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Re: [PATCH v2 5/6] mtd: rawnand: omap2: fix force_8bit flag behaviour for DMA mode

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:57 UTC, Roger Quadros wrote:
> In DMA mode we were not considering the force_8bit flag.
> 
> Fix it by using regular non-DMA 8-bit I/O if force_8bit flag is set.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

Re: [PATCH v2 5/6] mtd: rawnand: omap2: fix force_8bit flag behaviour for DMA mode

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:57 UTC, Roger Quadros wrote:
> In DMA mode we were not considering the force_8bit flag.
> 
> Fix it by using regular non-DMA 8-bit I/O if force_8bit flag is set.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

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Re: [PATCH v2 4/6] mtd: rawnand: omap2: Add compatible for AM64 SoC

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:56 UTC, Roger Quadros wrote:
> AM64 SoC contains the GPMC NAND controller. Add compatible for it.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

Re: [PATCH v2 4/6] mtd: rawnand: omap2: Add compatible for AM64 SoC

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:56 UTC, Roger Quadros wrote:
> AM64 SoC contains the GPMC NAND controller. Add compatible for it.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

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Re: [PATCH v2 3/6] mtd: rawnand: omap2: move to exec_op interface

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:55 UTC, Roger Quadros wrote:
> Stop using legacy interface and move to the exec_op interface.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

Re: [PATCH v2 3/6] mtd: rawnand: omap2: move to exec_op interface

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:55 UTC, Roger Quadros wrote:
> Stop using legacy interface and move to the exec_op interface.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

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Re: [PATCH v2 2/6] mtd: rawnand: omap2: Allow build on K3 platforms

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:54 UTC, Roger Quadros wrote:
> K3 platforms come with GPMC. Enable GPMC build for
> K3 platforms.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

Re: [PATCH v2 2/6] mtd: rawnand: omap2: Allow build on K3 platforms

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:54 UTC, Roger Quadros wrote:
> K3 platforms come with GPMC. Enable GPMC build for
> K3 platforms.
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

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Re: [PATCH v2 1/6] dt-bindings: mtd: ti, gpmc-nand: Add compatible for AM64 NAND

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:53 UTC, Roger Quadros wrote:
> AM64 SoC contains the GPMC NAND controller. Add compatible for it.
> 
> Cc: Rob Herring <robh+dt@kernel.org>
> Signed-off-by: Roger Quadros <rogerq@kernel.org>
> Acked-by: Rob Herring <robh@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

Re: [PATCH v2 1/6] dt-bindings: mtd: ti, gpmc-nand: Add compatible for AM64 NAND

[Miquel Raynal]

On Thu, 2021-12-09 at 09:04:53 UTC, Roger Quadros wrote:
> AM64 SoC contains the GPMC NAND controller. Add compatible for it.
> 
> Cc: Rob Herring <robh+dt@kernel.org>
> Signed-off-by: Roger Quadros <rogerq@kernel.org>
> Acked-by: Rob Herring <robh@kernel.org>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

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