[PATCH 0/5] mtd: rawnand: diskonchip: Convert to exec_op()

[PATCH 0/5] mtd: rawnand: diskonchip: Convert to exec_op()

[Boris Brezillon]

Hello,

A bit of context to explain the motivation behind those conversions
I've been sending for the last couple of weeks. The raw NAND subsystem
carries a lot of history which makes any rework not only painful, but
also subject to regressions which we only detect when someone dares to
update its kernel on one of those ancient HW. While carrying drivers
for old HW is not a problem per se, carrying ancient and unmaintained
drivers that are not converted to new APIs is a maintenance burden,
hence this massive conversion attempt I'm conducting here.

So here is a series converting the DiskOnChip NAND controller driver to
exec_op(), plus a bunch of minor improvements done along the way.

Regards,

Boris

Boris Brezillon (5):
  mtd: rawnand: diskonchip: Make sure doc2001plus_readbuf() works for
    single byte reads
  mtd: rawnand: diskonchip: Get rid of doc2000_readbuf_dword()
  mtd: rawnand: diskonchip: Inherit from nand_controller
  mtd: rawnand: diskonchip: Implement exec_op()
  mtd: rawnand: diskonchip: Get rid of the legacy interface
    implementation

 drivers/mtd/nand/raw/diskonchip.c | 521 ++++++++++++------------------
 1 file changed, 201 insertions(+), 320 deletions(-)

-- 
2.25.3


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[PATCH 1/5] mtd: rawnand: diskonchip: Make sure doc2001plus_readbuf() works for single byte reads

[Boris Brezillon]

Single byte accesses normally go through read_byte() but we are about
to use this function in the exec_op() implementation and thus needs to
prepare for single byte reads.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 drivers/mtd/nand/raw/diskonchip.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/diskonchip.c b/drivers/mtd/nand/raw/diskonchip.c
index 03f772a0ec2b..724493624822 100644
--- a/drivers/mtd/nand/raw/diskonchip.c
+++ b/drivers/mtd/nand/raw/diskonchip.c
@@ -550,9 +550,12 @@ static void doc2001plus_readbuf(struct nand_chip *this, u_char *buf, int len)
 	}
 
 	/* Terminate read pipeline */
-	buf[len - 2] = ReadDOC(docptr, Mplus_LastDataRead);
-	if (debug && i < 16)
-		printk("%02x ", buf[len - 2]);
+	if (len >= 2) {
+		buf[len - 2] = ReadDOC(docptr, Mplus_LastDataRead);
+		if (debug && i < 16)
+			printk("%02x ", buf[len - 2]);
+	}
+
 	buf[len - 1] = ReadDOC(docptr, Mplus_LastDataRead);
 	if (debug && i < 16)
 		printk("%02x ", buf[len - 1]);
-- 
2.25.3


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Re: [PATCH 1/5] mtd: rawnand: diskonchip: Make sure doc2001plus_readbuf() works for single byte reads

[Miquel Raynal]

On Fri, 2020-05-01 at 14:39:13 UTC, Boris Brezillon wrote:
> Single byte accesses normally go through read_byte() but we are about
> to use this function in the exec_op() implementation and thus needs to
> prepare for single byte reads.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>

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

Miquel

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[PATCH 2/5] mtd: rawnand: diskonchip: Get rid of doc2000_readbuf_dword()

[Boris Brezillon]

The logic can easily be merged in doc2000_readbuf().

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 drivers/mtd/nand/raw/diskonchip.c | 30 +++++++++---------------------
 1 file changed, 9 insertions(+), 21 deletions(-)

diff --git a/drivers/mtd/nand/raw/diskonchip.c b/drivers/mtd/nand/raw/diskonchip.c
index 724493624822..7d9542de37a7 100644
--- a/drivers/mtd/nand/raw/diskonchip.c
+++ b/drivers/mtd/nand/raw/diskonchip.c
@@ -69,6 +69,7 @@ struct doc_priv {
 	int mh1_page;
 	struct rs_control *rs_decoder;
 	struct mtd_info *nextdoc;
+	bool supports_32b_reads;
 
 	/* Handle the last stage of initialization (BBT scan, partitioning) */
 	int (*late_init)(struct mtd_info *mtd);
@@ -337,32 +338,19 @@ static void doc2000_readbuf(struct nand_chip *this, u_char *buf, int len)
 {
 	struct doc_priv *doc = nand_get_controller_data(this);
 	void __iomem *docptr = doc->virtadr;
+	u32 *buf32 = (u32 *)buf;
 	int i;
 
 	if (debug)
 		printk("readbuf of %d bytes: ", len);
 
-	for (i = 0; i < len; i++)
-		buf[i] = ReadDOC(docptr, 2k_CDSN_IO + i);
-}
-
-static void doc2000_readbuf_dword(struct nand_chip *this, u_char *buf, int len)
-{
-	struct doc_priv *doc = nand_get_controller_data(this);
-	void __iomem *docptr = doc->virtadr;
-	int i;
-
-	if (debug)
-		printk("readbuf_dword of %d bytes: ", len);
-
-	if (unlikely((((unsigned long)buf) | len) & 3)) {
-		for (i = 0; i < len; i++) {
-			*(uint8_t *) (&buf[i]) = ReadDOC(docptr, 2k_CDSN_IO + i);
-		}
+	if (!doc->supports_32b_reads ||
+	    ((((unsigned long)buf) | len) & 3)) {
+		for (i = 0; i < len; i++)
+			buf[i] = ReadDOC(docptr, 2k_CDSN_IO + i);
 	} else {
-		for (i = 0; i < len; i += 4) {
-			*(uint32_t *) (&buf[i]) = readl(docptr + DoC_2k_CDSN_IO + i);
-		}
+		for (i = 0; i < len / 4; i++)
+			buf32[i] = readl(docptr + DoC_2k_CDSN_IO + i);
 	}
 }
 
@@ -405,7 +393,7 @@ static uint16_t __init doc200x_ident_chip(struct mtd_info *mtd, int nr)
 		ident.dword = readl(docptr + DoC_2k_CDSN_IO);
 		if (((ident.byte[0] << 8) | ident.byte[1]) == ret) {
 			pr_info("DiskOnChip 2000 responds to DWORD access\n");
-			this->legacy.read_buf = &doc2000_readbuf_dword;
+			doc->supports_32b_reads = true;
 		}
 	}
 
-- 
2.25.3


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Re: [PATCH 2/5] mtd: rawnand: diskonchip: Get rid of doc2000_readbuf_dword()

[Miquel Raynal]

On Fri, 2020-05-01 at 14:39:14 UTC, Boris Brezillon wrote:
> The logic can easily be merged in doc2000_readbuf().
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>

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

Miquel

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[PATCH 3/5] mtd: rawnand: diskonchip: Inherit from nand_controller

[Boris Brezillon]

Stop relying on the dummy controller object embedded in nand_chip.legacy
and explicitly inherit from nand_controller.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 drivers/mtd/nand/raw/diskonchip.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mtd/nand/raw/diskonchip.c b/drivers/mtd/nand/raw/diskonchip.c
index 7d9542de37a7..b670b2a3d719 100644
--- a/drivers/mtd/nand/raw/diskonchip.c
+++ b/drivers/mtd/nand/raw/diskonchip.c
@@ -58,6 +58,7 @@ static unsigned long doc_locations[] __initdata = {
 static struct mtd_info *doclist = NULL;
 
 struct doc_priv {
+	struct nand_controller base;
 	void __iomem *virtadr;
 	unsigned long physadr;
 	u_char ChipID;
@@ -1550,6 +1551,7 @@ static int __init doc_probe(unsigned long physadr)
 		goto fail;
 	}
 
+	nand_controller_init(&doc->base);
 	mtd			= nand_to_mtd(nand);
 	nand->bbt_td		= (struct nand_bbt_descr *) (doc + 1);
 	nand->bbt_md		= nand->bbt_td + 1;
@@ -1557,6 +1559,7 @@ static int __init doc_probe(unsigned long physadr)
 	mtd->owner		= THIS_MODULE;
 	mtd_set_ooblayout(mtd, &doc200x_ooblayout_ops);
 
+	nand->controller	= &doc->base;
 	nand_set_controller_data(nand, doc);
 	nand->legacy.select_chip	= doc200x_select_chip;
 	nand->legacy.cmd_ctrl		= doc200x_hwcontrol;
-- 
2.25.3


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Re: [PATCH 3/5] mtd: rawnand: diskonchip: Inherit from nand_controller

[Miquel Raynal]

On Fri, 2020-05-01 at 14:39:15 UTC, Boris Brezillon wrote:
> Stop relying on the dummy controller object embedded in nand_chip.legacy
> and explicitly inherit from nand_controller.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>

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

Miquel

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[PATCH 4/5] mtd: rawnand: diskonchip: Implement exec_op()

[Boris Brezillon]

Implement exec_op() so we can later get rid of the legacy
implementation.

It's worth noting that the new implementation assert/deassert the CE
pin on each operation, which might not be necessary. We also dropped
the extra reset done at chip selection time on DOC2001plus. If it's
needed we really should do something smarter, because having a reset
everytime we access the chip is not that great perf-wise.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 drivers/mtd/nand/raw/diskonchip.c | 219 +++++++++++++++++++++++++++---
 1 file changed, 199 insertions(+), 20 deletions(-)

diff --git a/drivers/mtd/nand/raw/diskonchip.c b/drivers/mtd/nand/raw/diskonchip.c
index b670b2a3d719..8adeb39905ac 100644
--- a/drivers/mtd/nand/raw/diskonchip.c
+++ b/drivers/mtd/nand/raw/diskonchip.c
@@ -355,25 +355,38 @@ static void doc2000_readbuf(struct nand_chip *this, u_char *buf, int len)
 	}
 }
 
+/*
+ * We need our own readid() here because it's called before the NAND chip
+ * has been initialized, and calling nand_op_readid() would lead to a NULL
+ * pointer exception when dereferencing the NAND timings.
+ */
+static void doc200x_readid(struct nand_chip *this, unsigned int cs, u8 *id)
+{
+	u8 addr = 0;
+	struct nand_op_instr instrs[] = {
+		NAND_OP_CMD(NAND_CMD_READID, 0),
+		NAND_OP_ADDR(1, &addr, 50),
+		NAND_OP_8BIT_DATA_IN(2, id, 0),
+	};
+
+	struct nand_operation op = NAND_OPERATION(cs, instrs);
+
+	if (!id)
+		op.ninstrs--;
+
+	this->controller->ops->exec_op(this, &op, false);
+}
+
 static uint16_t __init doc200x_ident_chip(struct mtd_info *mtd, int nr)
 {
 	struct nand_chip *this = mtd_to_nand(mtd);
 	struct doc_priv *doc = nand_get_controller_data(this);
 	uint16_t ret;
+	u8 id[2];
 
-	doc200x_select_chip(this, nr);
-	doc200x_hwcontrol(this, NAND_CMD_READID,
-			  NAND_CTRL_CLE | NAND_CTRL_CHANGE);
-	doc200x_hwcontrol(this, 0, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
-	doc200x_hwcontrol(this, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
+	doc200x_readid(this, nr, id);
 
-	/* We can't use dev_ready here, but at least we wait for the
-	 * command to complete
-	 */
-	udelay(50);
-
-	ret = this->legacy.read_byte(this) << 8;
-	ret |= this->legacy.read_byte(this);
+	ret = ((u16)id[0] << 8) | id[1];
 
 	if (doc->ChipID == DOC_ChipID_Doc2k && try_dword && !nr) {
 		/* First chip probe. See if we get same results by 32-bit access */
@@ -383,13 +396,7 @@ static uint16_t __init doc200x_ident_chip(struct mtd_info *mtd, int nr)
 		} ident;
 		void __iomem *docptr = doc->virtadr;
 
-		doc200x_hwcontrol(this, NAND_CMD_READID,
-				  NAND_CTRL_CLE | NAND_CTRL_CHANGE);
-		doc200x_hwcontrol(this, 0, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
-		doc200x_hwcontrol(this, NAND_CMD_NONE,
-				  NAND_NCE | NAND_CTRL_CHANGE);
-
-		udelay(50);
+		doc200x_readid(this, nr, NULL);
 
 		ident.dword = readl(docptr + DoC_2k_CDSN_IO);
 		if (((ident.byte[0] << 8) | ident.byte[1]) == ret) {
@@ -630,6 +637,166 @@ static void doc200x_hwcontrol(struct nand_chip *this, int cmd,
 	}
 }
 
+static void doc200x_write_control(struct doc_priv *doc, u8 value)
+{
+	WriteDOC(value, doc->virtadr, CDSNControl);
+	/* 11.4.3 -- 4 NOPs after CSDNControl write */
+	DoC_Delay(doc, 4);
+}
+
+static void doc200x_exec_instr(struct nand_chip *this,
+			       const struct nand_op_instr *instr)
+{
+	struct doc_priv *doc = nand_get_controller_data(this);
+	unsigned int i;
+
+	switch (instr->type) {
+	case NAND_OP_CMD_INSTR:
+		doc200x_write_control(doc, CDSN_CTRL_CE | CDSN_CTRL_CLE);
+		doc2000_write_byte(this, instr->ctx.cmd.opcode);
+		break;
+
+	case NAND_OP_ADDR_INSTR:
+		doc200x_write_control(doc, CDSN_CTRL_CE | CDSN_CTRL_ALE);
+		for (i = 0; i < instr->ctx.addr.naddrs; i++) {
+			u8 addr = instr->ctx.addr.addrs[i];
+
+			if (DoC_is_2000(doc))
+				doc2000_write_byte(this, addr);
+			else
+				doc2001_write_byte(this, addr);
+		}
+		break;
+
+	case NAND_OP_DATA_IN_INSTR:
+		doc200x_write_control(doc, CDSN_CTRL_CE);
+		if (DoC_is_2000(doc))
+			doc2000_readbuf(this, instr->ctx.data.buf.in,
+					instr->ctx.data.len);
+		else
+			doc2001_readbuf(this, instr->ctx.data.buf.in,
+					instr->ctx.data.len);
+		break;
+
+	case NAND_OP_DATA_OUT_INSTR:
+		doc200x_write_control(doc, CDSN_CTRL_CE);
+		if (DoC_is_2000(doc))
+			doc2000_writebuf(this, instr->ctx.data.buf.out,
+					 instr->ctx.data.len);
+		else
+			doc2001_writebuf(this, instr->ctx.data.buf.out,
+					 instr->ctx.data.len);
+		break;
+
+	case NAND_OP_WAITRDY_INSTR:
+		DoC_WaitReady(doc);
+		break;
+	}
+
+	if (instr->delay_ns)
+		ndelay(instr->delay_ns);
+}
+
+static int doc200x_exec_op(struct nand_chip *this,
+			   const struct nand_operation *op,
+			   bool check_only)
+{
+	struct doc_priv *doc = nand_get_controller_data(this);
+	unsigned int i;
+
+	if (check_only)
+		return true;
+
+	doc->curchip = op->cs % doc->chips_per_floor;
+	doc->curfloor = op->cs / doc->chips_per_floor;
+
+	WriteDOC(doc->curfloor, doc->virtadr, FloorSelect);
+	WriteDOC(doc->curchip, doc->virtadr, CDSNDeviceSelect);
+
+	/* Assert CE pin */
+	doc200x_write_control(doc, CDSN_CTRL_CE);
+
+	for (i = 0; i < op->ninstrs; i++)
+		doc200x_exec_instr(this, &op->instrs[i]);
+
+	/* De-assert CE pin */
+	doc200x_write_control(doc, 0);
+
+	return 0;
+}
+
+static void doc2001plus_write_pipe_term(struct doc_priv *doc)
+{
+	WriteDOC(0x00, doc->virtadr, Mplus_WritePipeTerm);
+	WriteDOC(0x00, doc->virtadr, Mplus_WritePipeTerm);
+}
+
+static void doc2001plus_exec_instr(struct nand_chip *this,
+				   const struct nand_op_instr *instr)
+{
+	struct doc_priv *doc = nand_get_controller_data(this);
+	unsigned int i;
+
+	switch (instr->type) {
+	case NAND_OP_CMD_INSTR:
+		WriteDOC(instr->ctx.cmd.opcode, doc->virtadr, Mplus_FlashCmd);
+		doc2001plus_write_pipe_term(doc);
+		break;
+
+	case NAND_OP_ADDR_INSTR:
+		for (i = 0; i < instr->ctx.addr.naddrs; i++) {
+			u8 addr = instr->ctx.addr.addrs[i];
+
+			WriteDOC(addr, doc->virtadr, Mplus_FlashAddress);
+		}
+		doc2001plus_write_pipe_term(doc);
+		/* deassert ALE */
+		WriteDOC(0, doc->virtadr, Mplus_FlashControl);
+		break;
+
+	case NAND_OP_DATA_IN_INSTR:
+		doc2001plus_readbuf(this, instr->ctx.data.buf.in,
+				    instr->ctx.data.len);
+		break;
+	case NAND_OP_DATA_OUT_INSTR:
+		doc2001plus_writebuf(this, instr->ctx.data.buf.out,
+				     instr->ctx.data.len);
+		doc2001plus_write_pipe_term(doc);
+		break;
+	case NAND_OP_WAITRDY_INSTR:
+		DoC_WaitReady(doc);
+		break;
+	}
+
+	if (instr->delay_ns)
+		ndelay(instr->delay_ns);
+}
+
+static int doc2001plus_exec_op(struct nand_chip *this,
+			       const struct nand_operation *op,
+			       bool check_only)
+{
+	struct doc_priv *doc = nand_get_controller_data(this);
+	unsigned int i;
+
+	if (check_only)
+		return true;
+
+	doc->curchip = op->cs % doc->chips_per_floor;
+	doc->curfloor = op->cs / doc->chips_per_floor;
+
+	/* Assert ChipEnable and deassert WriteProtect */
+	WriteDOC(DOC_FLASH_CE, doc->virtadr, Mplus_FlashSelect);
+
+	for (i = 0; i < op->ninstrs; i++)
+		doc2001plus_exec_instr(this, &op->instrs[i]);
+
+	/* De-assert ChipEnable */
+	WriteDOC(0, doc->virtadr, Mplus_FlashSelect);
+
+	return 0;
+}
+
 static void doc2001plus_command(struct nand_chip *this, unsigned command,
 				int column, int page_addr)
 {
@@ -1390,6 +1557,14 @@ static inline int __init doc2001plus_init(struct mtd_info *mtd)
 	return 1;
 }
 
+static const struct nand_controller_ops doc200x_ops = {
+	.exec_op = doc200x_exec_op,
+};
+
+static const struct nand_controller_ops doc2001plus_ops = {
+	.exec_op = doc2001plus_exec_op,
+};
+
 static int __init doc_probe(unsigned long physadr)
 {
 	struct nand_chip *nand = NULL;
@@ -1533,7 +1708,6 @@ static int __init doc_probe(unsigned long physadr)
 		goto fail;
 	}
 
-
 	/*
 	 * Allocate a RS codec instance
 	 *
@@ -1552,6 +1726,11 @@ static int __init doc_probe(unsigned long physadr)
 	}
 
 	nand_controller_init(&doc->base);
+	if (ChipID == DOC_ChipID_DocMilPlus16)
+		doc->base.ops = &doc2001plus_ops;
+	else
+		doc->base.ops = &doc200x_ops;
+
 	mtd			= nand_to_mtd(nand);
 	nand->bbt_td		= (struct nand_bbt_descr *) (doc + 1);
 	nand->bbt_md		= nand->bbt_td + 1;
-- 
2.25.3


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Re: [PATCH 4/5] mtd: rawnand: diskonchip: Implement exec_op()

[Miquel Raynal]

On Fri, 2020-05-01 at 14:39:16 UTC, Boris Brezillon wrote:
> Implement exec_op() so we can later get rid of the legacy
> implementation.
> 
> It's worth noting that the new implementation assert/deassert the CE
> pin on each operation, which might not be necessary. We also dropped
> the extra reset done at chip selection time on DOC2001plus. If it's
> needed we really should do something smarter, because having a reset
> everytime we access the chip is not that great perf-wise.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>

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

Miquel

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[PATCH 5/5] mtd: rawnand: diskonchip: Get rid of the legacy interface implementation

[Boris Brezillon]

Now that exec_op() has been implemented we can get rid of the legacy
interface implementation.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 drivers/mtd/nand/raw/diskonchip.c | 292 ------------------------------
 1 file changed, 292 deletions(-)

diff --git a/drivers/mtd/nand/raw/diskonchip.c b/drivers/mtd/nand/raw/diskonchip.c
index 8adeb39905ac..85fa31f28b2e 100644
--- a/drivers/mtd/nand/raw/diskonchip.c
+++ b/drivers/mtd/nand/raw/diskonchip.c
@@ -86,10 +86,6 @@ static u_char empty_write_ecc[6] = { 0x4b, 0x00, 0xe2, 0x0e, 0x93, 0xf7 };
 #define DoC_is_Millennium(doc) ((doc)->ChipID == DOC_ChipID_DocMil)
 #define DoC_is_2000(doc) ((doc)->ChipID == DOC_ChipID_Doc2k)
 
-static void doc200x_hwcontrol(struct nand_chip *this, int cmd,
-			      unsigned int bitmask);
-static void doc200x_select_chip(struct nand_chip *this, int chip);
-
 static int debug = 0;
 module_param(debug, int, 0);
 
@@ -304,20 +300,6 @@ static void doc2000_write_byte(struct nand_chip *this, u_char datum)
 	WriteDOC(datum, docptr, 2k_CDSN_IO);
 }
 
-static u_char doc2000_read_byte(struct nand_chip *this)
-{
-	struct doc_priv *doc = nand_get_controller_data(this);
-	void __iomem *docptr = doc->virtadr;
-	u_char ret;
-
-	ReadDOC(docptr, CDSNSlowIO);
-	DoC_Delay(doc, 2);
-	ret = ReadDOC(docptr, 2k_CDSN_IO);
-	if (debug)
-		printk("read_byte returns %02x\n", ret);
-	return ret;
-}
-
 static void doc2000_writebuf(struct nand_chip *this, const u_char *buf,
 			     int len)
 {
@@ -430,20 +412,6 @@ static void __init doc2000_count_chips(struct mtd_info *mtd)
 	pr_debug("Detected %d chips per floor.\n", i);
 }
 
-static int doc200x_wait(struct nand_chip *this)
-{
-	struct doc_priv *doc = nand_get_controller_data(this);
-
-	int status;
-
-	DoC_WaitReady(doc);
-	nand_status_op(this, NULL);
-	DoC_WaitReady(doc);
-	status = (int)this->legacy.read_byte(this);
-
-	return status;
-}
-
 static void doc2001_write_byte(struct nand_chip *this, u_char datum)
 {
 	struct doc_priv *doc = nand_get_controller_data(this);
@@ -454,19 +422,6 @@ static void doc2001_write_byte(struct nand_chip *this, u_char datum)
 	WriteDOC(datum, docptr, WritePipeTerm);
 }
 
-static u_char doc2001_read_byte(struct nand_chip *this)
-{
-	struct doc_priv *doc = nand_get_controller_data(this);
-	void __iomem *docptr = doc->virtadr;
-
-	//ReadDOC(docptr, CDSNSlowIO);
-	/* 11.4.5 -- delay twice to allow extended length cycle */
-	DoC_Delay(doc, 2);
-	ReadDOC(docptr, ReadPipeInit);
-	//return ReadDOC(docptr, Mil_CDSN_IO);
-	return ReadDOC(docptr, LastDataRead);
-}
-
 static void doc2001_writebuf(struct nand_chip *this, const u_char *buf, int len)
 {
 	struct doc_priv *doc = nand_get_controller_data(this);
@@ -495,20 +450,6 @@ static void doc2001_readbuf(struct nand_chip *this, u_char *buf, int len)
 	buf[i] = ReadDOC(docptr, LastDataRead);
 }
 
-static u_char doc2001plus_read_byte(struct nand_chip *this)
-{
-	struct doc_priv *doc = nand_get_controller_data(this);
-	void __iomem *docptr = doc->virtadr;
-	u_char ret;
-
-	ReadDOC(docptr, Mplus_ReadPipeInit);
-	ReadDOC(docptr, Mplus_ReadPipeInit);
-	ret = ReadDOC(docptr, Mplus_LastDataRead);
-	if (debug)
-		printk("read_byte returns %02x\n", ret);
-	return ret;
-}
-
 static void doc2001plus_writebuf(struct nand_chip *this, const u_char *buf, int len)
 {
 	struct doc_priv *doc = nand_get_controller_data(this);
@@ -559,84 +500,6 @@ static void doc2001plus_readbuf(struct nand_chip *this, u_char *buf, int len)
 		printk("\n");
 }
 
-static void doc2001plus_select_chip(struct nand_chip *this, int chip)
-{
-	struct doc_priv *doc = nand_get_controller_data(this);
-	void __iomem *docptr = doc->virtadr;
-	int floor = 0;
-
-	if (debug)
-		printk("select chip (%d)\n", chip);
-
-	if (chip == -1) {
-		/* Disable flash internally */
-		WriteDOC(0, docptr, Mplus_FlashSelect);
-		return;
-	}
-
-	floor = chip / doc->chips_per_floor;
-	chip -= (floor * doc->chips_per_floor);
-
-	/* Assert ChipEnable and deassert WriteProtect */
-	WriteDOC((DOC_FLASH_CE), docptr, Mplus_FlashSelect);
-	nand_reset_op(this);
-
-	doc->curchip = chip;
-	doc->curfloor = floor;
-}
-
-static void doc200x_select_chip(struct nand_chip *this, int chip)
-{
-	struct doc_priv *doc = nand_get_controller_data(this);
-	void __iomem *docptr = doc->virtadr;
-	int floor = 0;
-
-	if (debug)
-		printk("select chip (%d)\n", chip);
-
-	if (chip == -1)
-		return;
-
-	floor = chip / doc->chips_per_floor;
-	chip -= (floor * doc->chips_per_floor);
-
-	/* 11.4.4 -- deassert CE before changing chip */
-	doc200x_hwcontrol(this, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
-
-	WriteDOC(floor, docptr, FloorSelect);
-	WriteDOC(chip, docptr, CDSNDeviceSelect);
-
-	doc200x_hwcontrol(this, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
-
-	doc->curchip = chip;
-	doc->curfloor = floor;
-}
-
-#define CDSN_CTRL_MSK (CDSN_CTRL_CE | CDSN_CTRL_CLE | CDSN_CTRL_ALE)
-
-static void doc200x_hwcontrol(struct nand_chip *this, int cmd,
-			      unsigned int ctrl)
-{
-	struct doc_priv *doc = nand_get_controller_data(this);
-	void __iomem *docptr = doc->virtadr;
-
-	if (ctrl & NAND_CTRL_CHANGE) {
-		doc->CDSNControl &= ~CDSN_CTRL_MSK;
-		doc->CDSNControl |= ctrl & CDSN_CTRL_MSK;
-		if (debug)
-			printk("hwcontrol(%d): %02x\n", cmd, doc->CDSNControl);
-		WriteDOC(doc->CDSNControl, docptr, CDSNControl);
-		/* 11.4.3 -- 4 NOPs after CSDNControl write */
-		DoC_Delay(doc, 4);
-	}
-	if (cmd != NAND_CMD_NONE) {
-		if (DoC_is_2000(doc))
-			doc2000_write_byte(this, cmd);
-		else
-			doc2001_write_byte(this, cmd);
-	}
-}
-
 static void doc200x_write_control(struct doc_priv *doc, u8 value)
 {
 	WriteDOC(value, doc->virtadr, CDSNControl);
@@ -797,144 +660,6 @@ static int doc2001plus_exec_op(struct nand_chip *this,
 	return 0;
 }
 
-static void doc2001plus_command(struct nand_chip *this, unsigned command,
-				int column, int page_addr)
-{
-	struct mtd_info *mtd = nand_to_mtd(this);
-	struct doc_priv *doc = nand_get_controller_data(this);
-	void __iomem *docptr = doc->virtadr;
-
-	/*
-	 * Must terminate write pipeline before sending any commands
-	 * to the device.
-	 */
-	if (command == NAND_CMD_PAGEPROG) {
-		WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
-		WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
-	}
-
-	/*
-	 * Write out the command to the device.
-	 */
-	if (command == NAND_CMD_SEQIN) {
-		int readcmd;
-
-		if (column >= mtd->writesize) {
-			/* OOB area */
-			column -= mtd->writesize;
-			readcmd = NAND_CMD_READOOB;
-		} else if (column < 256) {
-			/* First 256 bytes --> READ0 */
-			readcmd = NAND_CMD_READ0;
-		} else {
-			column -= 256;
-			readcmd = NAND_CMD_READ1;
-		}
-		WriteDOC(readcmd, docptr, Mplus_FlashCmd);
-	}
-	WriteDOC(command, docptr, Mplus_FlashCmd);
-	WriteDOC(0, docptr, Mplus_WritePipeTerm);
-	WriteDOC(0, docptr, Mplus_WritePipeTerm);
-
-	if (column != -1 || page_addr != -1) {
-		/* Serially input address */
-		if (column != -1) {
-			/* Adjust columns for 16 bit buswidth */
-			if (this->options & NAND_BUSWIDTH_16 &&
-					!nand_opcode_8bits(command))
-				column >>= 1;
-			WriteDOC(column, docptr, Mplus_FlashAddress);
-		}
-		if (page_addr != -1) {
-			WriteDOC((unsigned char)(page_addr & 0xff), docptr, Mplus_FlashAddress);
-			WriteDOC((unsigned char)((page_addr >> 8) & 0xff), docptr, Mplus_FlashAddress);
-			if (this->options & NAND_ROW_ADDR_3) {
-				WriteDOC((unsigned char)((page_addr >> 16) & 0x0f), docptr, Mplus_FlashAddress);
-				printk("high density\n");
-			}
-		}
-		WriteDOC(0, docptr, Mplus_WritePipeTerm);
-		WriteDOC(0, docptr, Mplus_WritePipeTerm);
-		/* deassert ALE */
-		if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 ||
-		    command == NAND_CMD_READOOB || command == NAND_CMD_READID)
-			WriteDOC(0, docptr, Mplus_FlashControl);
-	}
-
-	/*
-	 * program and erase have their own busy handlers
-	 * status and sequential in needs no delay
-	 */
-	switch (command) {
-
-	case NAND_CMD_PAGEPROG:
-	case NAND_CMD_ERASE1:
-	case NAND_CMD_ERASE2:
-	case NAND_CMD_SEQIN:
-	case NAND_CMD_STATUS:
-		return;
-
-	case NAND_CMD_RESET:
-		if (this->legacy.dev_ready)
-			break;
-		udelay(this->legacy.chip_delay);
-		WriteDOC(NAND_CMD_STATUS, docptr, Mplus_FlashCmd);
-		WriteDOC(0, docptr, Mplus_WritePipeTerm);
-		WriteDOC(0, docptr, Mplus_WritePipeTerm);
-		while (!(this->legacy.read_byte(this) & 0x40)) ;
-		return;
-
-		/* This applies to read commands */
-	default:
-		/*
-		 * If we don't have access to the busy pin, we apply the given
-		 * command delay
-		 */
-		if (!this->legacy.dev_ready) {
-			udelay(this->legacy.chip_delay);
-			return;
-		}
-	}
-
-	/* Apply this short delay always to ensure that we do wait tWB in
-	 * any case on any machine. */
-	ndelay(100);
-	/* wait until command is processed */
-	while (!this->legacy.dev_ready(this)) ;
-}
-
-static int doc200x_dev_ready(struct nand_chip *this)
-{
-	struct doc_priv *doc = nand_get_controller_data(this);
-	void __iomem *docptr = doc->virtadr;
-
-	if (DoC_is_MillenniumPlus(doc)) {
-		/* 11.4.2 -- must NOP four times before checking FR/B# */
-		DoC_Delay(doc, 4);
-		if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) {
-			if (debug)
-				printk("not ready\n");
-			return 0;
-		}
-		if (debug)
-			printk("was ready\n");
-		return 1;
-	} else {
-		/* 11.4.2 -- must NOP four times before checking FR/B# */
-		DoC_Delay(doc, 4);
-		if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
-			if (debug)
-				printk("not ready\n");
-			return 0;
-		}
-		/* 11.4.2 -- Must NOP twice if it's ready */
-		DoC_Delay(doc, 2);
-		if (debug)
-			printk("was ready\n");
-		return 1;
-	}
-}
-
 static void doc200x_enable_hwecc(struct nand_chip *this, int mode)
 {
 	struct doc_priv *doc = nand_get_controller_data(this);
@@ -1496,9 +1221,6 @@ static inline int __init doc2000_init(struct mtd_info *mtd)
 	struct nand_chip *this = mtd_to_nand(mtd);
 	struct doc_priv *doc = nand_get_controller_data(this);
 
-	this->legacy.read_byte = doc2000_read_byte;
-	this->legacy.write_buf = doc2000_writebuf;
-	this->legacy.read_buf = doc2000_readbuf;
 	doc->late_init = nftl_scan_bbt;
 
 	doc->CDSNControl = CDSN_CTRL_FLASH_IO | CDSN_CTRL_ECC_IO;
@@ -1512,10 +1234,6 @@ static inline int __init doc2001_init(struct mtd_info *mtd)
 	struct nand_chip *this = mtd_to_nand(mtd);
 	struct doc_priv *doc = nand_get_controller_data(this);
 
-	this->legacy.read_byte = doc2001_read_byte;
-	this->legacy.write_buf = doc2001_writebuf;
-	this->legacy.read_buf = doc2001_readbuf;
-
 	ReadDOC(doc->virtadr, ChipID);
 	ReadDOC(doc->virtadr, ChipID);
 	ReadDOC(doc->virtadr, ChipID);
@@ -1542,13 +1260,7 @@ static inline int __init doc2001plus_init(struct mtd_info *mtd)
 	struct nand_chip *this = mtd_to_nand(mtd);
 	struct doc_priv *doc = nand_get_controller_data(this);
 
-	this->legacy.read_byte = doc2001plus_read_byte;
-	this->legacy.write_buf = doc2001plus_writebuf;
-	this->legacy.read_buf = doc2001plus_readbuf;
 	doc->late_init = inftl_scan_bbt;
-	this->legacy.cmd_ctrl = NULL;
-	this->legacy.select_chip = doc2001plus_select_chip;
-	this->legacy.cmdfunc = doc2001plus_command;
 	this->ecc.hwctl = doc2001plus_enable_hwecc;
 
 	doc->chips_per_floor = 1;
@@ -1740,10 +1452,6 @@ static int __init doc_probe(unsigned long physadr)
 
 	nand->controller	= &doc->base;
 	nand_set_controller_data(nand, doc);
-	nand->legacy.select_chip	= doc200x_select_chip;
-	nand->legacy.cmd_ctrl		= doc200x_hwcontrol;
-	nand->legacy.dev_ready	= doc200x_dev_ready;
-	nand->legacy.waitfunc	= doc200x_wait;
 	nand->ecc.hwctl		= doc200x_enable_hwecc;
 	nand->ecc.calculate	= doc200x_calculate_ecc;
 	nand->ecc.correct	= doc200x_correct_data;
-- 
2.25.3


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Re: [PATCH 5/5] mtd: rawnand: diskonchip: Get rid of the legacy interface implementation

[Miquel Raynal]

On Fri, 2020-05-01 at 14:39:17 UTC, Boris Brezillon wrote:
> Now that exec_op() has been implemented we can get rid of the legacy
> interface implementation.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>

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

Miquel

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