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Message-Id: <20110208122446.19110.16806.sendpatchset@linux-mhg7.site>
Date: Tue, 08 Feb 2011 13:24:46 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To: linux-ide@...r.kernel.org
Cc: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 10/20] pata_radisys: unify code for programming PIO and MWDMA timings
>From 656a1d1e17b035c7de7e7ea602f03724fdcbb336 Mon Sep 17 00:00:00 2001
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Date: Tue, 8 Feb 2011 12:39:26 +0100
Subject: [PATCH 10/20] pata_radisys: unify code for programming PIO and MWDMA timings
Besides making things noticably simpler 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@...il.com>
---
drivers/ata/pata_radisys.c | 66 ++++++++++++++++---------------------------
1 files changed, 25 insertions(+), 41 deletions(-)
diff --git a/drivers/ata/pata_radisys.c b/drivers/ata/pata_radisys.c
index 8574b31..e85bb38 100644
--- 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 ata_port *ap, struct ata_device *adev)
*/
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 ata_port *ap, struct ata_device *adev)
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 ata_port *ap, struct ata_device *adev)
}
/**
+ * 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 ata_port *ap, struct ata_device *adev)
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 ata_port *ap, struct ata_device *adev)
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 ata_port *ap, struct ata_device *adev)
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 */
--
1.7.1
--
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