[PATCH 64/86] pata_radisys: unify code for programming PIO and MWDMA timings

Bartlomiej Zolnierkiewicz
2009-11-25T17:10:51Z

From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Subject: [PATCH] pata_radisys: unify code for programming PIO and MWDMA timings

It results in ~6% decrease in the driver LOC count and also ~1%
decrease in the driver binary size (as measured on x86-32).

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
drivers/ata/pata_radisys.c | 66 +++++++++++++++++----------------------------
1 file changed, 25 insertions(+), 41 deletions(-)

Index: b/drivers/ata/pata_radisys.c
===================================================================
--- a/drivers/ata/pata_radisys.c
+++ b/drivers/ata/pata_radisys.c
@@ -26,20 +26,9 @@
#define DRV_NAME "pata_radisys"
#define DRV_VERSION "0.4.4"

-/**
- * radisys_set_piomode - Initialize host controller PATA PIO timings
- * @ap: ATA port
- * @adev: Device whose timings we are configuring
- *
- * Set PIO mode for device, in host controller PCI config space.
- *
- * LOCKING:
- * None (inherited from caller).
- */
-
-static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev)
+static void radisys_set_timings(struct ata_port *ap, struct ata_device *adev,
+ u8 pio, bool use_mwdma)
{
- unsigned int pio = adev->pio_mode - XFER_PIO_0;
struct pci_dev *dev = to_pci_dev(ap->host->dev);
u16 idetm_data;
int control = 0;
@@ -52,7 +41,7 @@ static void radisys_set_piomode (struct
*/

static const /* ISP RTC */
- u8 timings[][2] = { { 0, 0 }, /* Check me */
+ u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 1 },
{ 2, 2 },
@@ -62,6 +51,10 @@ static void radisys_set_piomode (struct
control |= 1; /* TIME1 enable */
if (ata_pio_need_iordy(adev))
control |= 2; /* IE IORDY */
+ /* If the drive MWDMA is faster than it can do PIO then
+ we must force PIO0 for PIO cycles. */
+ if (use_mwdma && adev->pio_mode < (XFER_PIO_0 + pio))
+ control = 1;

pci_read_config_word(dev, 0x40, &idetm_data);

@@ -78,6 +71,22 @@ static void radisys_set_piomode (struct
}

/**
+ * radisys_set_piomode - Initialize host controller PATA PIO timings
+ * @ap: ATA port
+ * @adev: Device whose timings we are configuring
+ *
+ * Set PIO mode for device, in host controller PCI config space.
+ *
+ * LOCKING:
+ * None (inherited from caller).
+ */
+
+static void radisys_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+ radisys_set_timings(ap, adev, adev->pio_mode - XFER_PIO_0, 0);
+}
+
+/**
* radisys_set_dmamode - Initialize host controller PATA DMA timings
* @ap: Port whose timings we are configuring
* @adev: Device to program
@@ -91,22 +100,10 @@ static void radisys_set_piomode (struct
static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *dev = to_pci_dev(ap->host->dev);
- u16 idetm_data;
u8 udma_enable;

- static const /* ISP RTC */
- u8 timings[][2] = { { 0, 0 },
- { 0, 0 },
- { 1, 1 },
- { 2, 2 },
- { 3, 3 }, };
-
- /*
- * MWDMA is driven by the PIO timings. We must also enable
- * IORDY unconditionally.
- */
+ /* MWDMA is driven by the PIO timings. */

- pci_read_config_word(dev, 0x40, &idetm_data);
pci_read_config_byte(dev, 0x48, &udma_enable);

if (adev->dma_mode < XFER_UDMA_0) {
@@ -115,20 +112,8 @@ static void radisys_set_dmamode (struct
XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
};
int pio = needed_pio[mwdma] - XFER_PIO_0;
- int control = 3; /* IORDY|TIME0 */
-
- /* If the drive MWDMA is faster than it can do PIO then
- we must force PIO0 for PIO cycles. */
-
- if (adev->pio_mode < needed_pio[mwdma])
- control = 1;

- /* Mask out the relevant control and timing bits we will load. Also
- clear the other drive TIME register as a precaution */
-
- idetm_data &= 0xCCCC;
- idetm_data |= control << (4 * adev->devno);
- idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
+ radisys_set_timings(ap, adev, pio, 1);

udma_enable &= ~(1 << adev->devno);
} else {
@@ -147,7 +132,6 @@ static void radisys_set_dmamode (struct

udma_enable |= (1 << adev->devno);
}
- pci_write_config_word(dev, 0x40, idetm_data);
pci_write_config_byte(dev, 0x48, udma_enable);

/* Track which port is configured */