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pata_hpt366: add hpt36x_find_mode() helper

PATCH In review Bartlomiej Zolnierkiewicz 2 participants 2 messages Nov 27, 2009 libata

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Bartlomiej Zolnierkiewicz

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#0 lore raw

PATCH 1/1 pata_hpt366: add hpt36x_find_mode() helper

Factor out code for finding the register programming information from hpt366_set_mode() to hpt36x_find_mode().

This makes pata_hpt366 driver more similar to pata_{37x,3x2n} ones.

Signed-off-by Bartlomiej Zolnierkiewicz <[email protected]>

---
Sergei, pata_hpt{37x,3x2n} drivers can also be made to use *set_mode() helper but I don't want to interfere with your pending fixes there.

 drivers/ata/pata_hpt366.c |   35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)
drivers/ata/pata_hpt366.c +25 -10
Index: b/drivers/ata/pata_hpt366.c
===================================================================
@@ -114,6 +114,28 @@ static const struct hpt_clock hpt366_25[
 	{	0,		0x01208585	}
 };
 
+/**
+ *	hpt36x_find_mode	-	find the hpt36x timing
+ *	@ap: ATA port
+ *	@speed: transfer mode
+ *
+ *	Return the 32bit register programming information for this channel
+ *	that matches the speed provided.
+ */
+
+static u32 hpt36x_find_mode(struct ata_port *ap, int speed)
+{
+	struct hpt_clock *clocks = ap->host->private_data;
+
+	while (clocks->xfer_mode) {
+		if (clocks->xfer_mode == speed)
+			return clocks->timing;
+		clocks++;
+	}
+	BUG();
+	return 0xffffffffU;	/* silence compiler warning */
+}
+
 static const char *bad_ata33[] = {
 	"Maxtor 92720U8", "Maxtor 92040U6", "Maxtor 91360U4", "Maxtor 91020U3", "Maxtor 90845U3", "Maxtor 90650U2",
 	"Maxtor 91360D8", "Maxtor 91190D7", "Maxtor 91020D6", "Maxtor 90845D5", "Maxtor 90680D4", "Maxtor 90510D3", "Maxtor 90340D2",

@@ -238,11 +260,10 @@ static int hpt36x_prereset(struct ata_li
 static void hpt366_set_mode(struct ata_port *ap, struct ata_device *adev,
 			    u8 mode)
 {
-	struct hpt_clock *clocks = ap->host->private_data;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	u32 addr1 = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
 	u32 addr2 = 0x51 + 4 * ap->port_no;
-	u32 mask, reg;
+	u32 mask, reg, t;
 	u8 fast;
 
 	/* Fast interrupt prediction disable, hold off interrupt disable */

@@ -260,13 +281,7 @@ static void hpt366_set_mode(struct ata_p
 	else
 		mask = 0x30070000;
 
-	while (clocks->xfer_mode) {
-		if (clocks->xfer_mode == mode)
-			break;
-		clocks++;
-	}
-	if (!clocks->xfer_mode)
-		BUG();
+	t = hpt36x_find_mode(ap, mode);
 
 	/*
 	 * Combine new mode bits with old config bits and disable

@@ -274,7 +289,7 @@ static void hpt366_set_mode(struct ata_p
 	 * problems handling I/O errors later.
 	 */
 	pci_read_config_dword(pdev, addr1, &reg);
-	reg = ((reg & ~mask) | (clocks->timing & mask)) & ~0xc0000000;
+	reg = ((reg & ~mask) | (t & mask)) & ~0xc0000000;
 	pci_write_config_dword(pdev, addr1, reg);
 }
#1 lore raw

Hello.

Quoted 2 lines · Bartlomiej Zolnierkiewicz

Factor out code for finding the register programming information from hpt366_set_mode() to hpt36x_find_mode().

Not sure what it gives us...

Quoted 1 line

This makes pata_hpt366 driver more similar to pata_{37x,3x2n} ones.

... if only that. :-)

Quoted 4 lines
Signed-off-by Bartlomiej Zolnierkiewicz <[email protected]>

---
Sergei, pata_hpt{37x,3x2n} drivers can also be made to use *set_mode() helper but I don't want to interfere with your pending fixes there.

Yeah, it's on my agenda. :-)

Quoted 18 lines
 drivers/ata/pata_hpt366.c |   35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

Index: b/drivers/ata/pata_hpt366.c
===================================================================

drivers/ata/pata_hpt366.c +7 -0
@@ -114,6 +114,28 @@ static const struct hpt_clock hpt366_25[
 	{	0,		0x01208585	}
 };
 
+/**
+ *	hpt36x_find_mode	-	find the hpt36x timing
+ *	@ap: ATA port
+ *	@speed: transfer mode
+ *
+ *	Return the 32bit register programming information for this channel
+ *	that matches the speed provided.

drivers/ata/pata_hpt366.c static const struct hpt_clock hpt366_25[ · line 133

Quoted 10 lines
drivers/ata/pata_hpt366.c +10 -0
+ */
+
+static u32 hpt36x_find_mode(struct ata_port *ap, int speed)
+{
+	struct hpt_clock *clocks = ap->host->private_data;
+
+	while (clocks->xfer_mode) {
+		if (clocks->xfer_mode == speed)
+			return clocks->timing;
+		clocks++;

This whole data structure of <mode, timing> tuples makes my eyes hurt.
If you remember, I've changed it to a separate array of modes and timings which takes ~twice less space...

Quoted 9 lines
drivers/ata/pata_hpt366.c +5 -0
+	}
+	BUG();
+	return 0xffffffffU;	/* silence compiler warning */
+}
+
 static const char *bad_ata33[] = {
 	"Maxtor 92720U8", "Maxtor 92040U6", "Maxtor 91360U4", "Maxtor 91020U3", "Maxtor 90845U3", "Maxtor 90650U2",
 	"Maxtor 91360D8", "Maxtor 91190D7", "Maxtor 91020D6", "Maxtor 90845D5", "Maxtor 90680D4", "Maxtor 90510D3", "Maxtor 90340D2",

drivers/ata/pata_hpt366.c static int hpt36x_prereset(struct ata_li · line 266

Quoted 9 lines
drivers/ata/pata_hpt366.c +1 -2
@@ -238,11 +260,10 @@ static int hpt36x_prereset(struct ata_li
 static void hpt366_set_mode(struct ata_port *ap, struct ata_device *adev,
 			    u8 mode)
 {
-	struct hpt_clock *clocks = ap->host->private_data;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	u32 addr1 = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
 	u32 addr2 = 0x51 + 4 * ap->port_no;
-	u32 mask, reg;
+	u32 mask, reg, t;

Alan calls this 't' variable 'mode' if you want to be 100% similar. ;-)

WBR, Sergei