[PATCH 2/5] pata_sis: Implement MWDMA for the UDMA 133 capable chips

Alan Cox
2009-11-17T15:07:34Z

Bartlomiej pointed out that while this got fixed in the old driver whoever
did it didn't port it across.

Signed-off-by: Alan Cox <alan@linux.intel.com>
---

drivers/ata/pata_sis.c | 91 ++++++++++++++++++++++++++++++++++++------------
1 files changed, 69 insertions(+), 22 deletions(-)

diff --git a/drivers/ata/pata_sis.c b/drivers/ata/pata_sis.c
index 488e77b..d70ecec 100644
--- a/drivers/ata/pata_sis.c
+++ b/drivers/ata/pata_sis.c
@@ -252,24 +252,25 @@ static void sis_100_set_piomode (struct ata_port *ap, struct ata_device *adev)
}

/**
- * sis_133_set_piomode - Initialize host controller PATA PIO timings
+ * sis_133_do_piomode - Initialize host controller PATA PIO/DMA timings
* @ap: Port whose timings we are configuring
* @adev: Device we are configuring for.
*
* Set PIO mode for device, in host controller PCI config space. This
- * function handles PIO set up for the later ATA133 devices.
+ * function handles PIO set up for the later ATA133 devices. The same
+ * timings are used for MWDMA.
*
* LOCKING:
* None (inherited from caller).
*/

-static void sis_133_set_piomode (struct ata_port *ap, struct ata_device *adev)
+static void sis_133_do_piomode(struct ata_port *ap, struct ata_device *adev,
+ int speed)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int port = 0x40;
u32 t1;
u32 reg54;
- int speed = adev->pio_mode - XFER_PIO_0;

const u32 timing133[] = {
0x28269000, /* Recovery << 24 | Act << 16 | Ini << 12 */
@@ -305,6 +306,42 @@ static void sis_133_set_piomode (struct ata_port *ap, struct ata_device *adev)
}

/**
+ * sis_133_set_piomode - Initialize host controller PATA PIO timings
+ * @ap: Port whose timings we are configuring
+ * @adev: Device we are configuring for.
+ *
+ * Set PIO mode for device, in host controller PCI config space. This
+ * function handles PIO set up for the later ATA133 devices.
+ *
+ * LOCKING:
+ * None (inherited from caller).
+ */
+
+static void sis_133_set_piomode (struct ata_port *ap, struct ata_device *adev)
+{
+
+ sis_133_do_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
+}
+
+/**
+ * mwdma_clip_to_pio - clip MWDMA mode
+ * @adev: device
+ *
+ * As the SiS shared MWDMA and PIO timings we must program the equivalent
+ * PIO timing for the MWDMA mode but we must not program one higher than
+ * the permitted PIO timing of the device.
+ */
+
+static int mwdma_clip_to_pio(struct ata_device *adev)
+{
+ const int mwdma_to_pio[3] = {
+ XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
+ };
+ return min(mwdma_to_pio[adev->dma_mode - XFER_MW_DMA_0],
+ adev->pio_mode - XFER_PIO_0);
+}
+
+/**
* sis_old_set_dmamode - Initialize host controller PATA DMA timings
* @ap: Port whose timings we are configuring
* @adev: Device to program
@@ -332,6 +369,7 @@ static void sis_old_set_dmamode (struct ata_port *ap, struct ata_device *adev)
if (adev->dma_mode < XFER_UDMA_0) {
/* bits 3-0 hold recovery timing bits 8-10 active timing and
the higher bits are dependant on the device */
+ speed = mwdma_clip_to_pio(adev);
timing &= ~0x870F;
timing |= mwdma_bits[speed];
} else {
@@ -372,6 +410,7 @@ static void sis_66_set_dmamode (struct ata_port *ap, struct ata_device *adev)
if (adev->dma_mode < XFER_UDMA_0) {
/* bits 3-0 hold recovery timing bits 8-10 active timing and
the higher bits are dependant on the device, bit 15 udma */
+ speed = mwdma_clip_to_pio(adev);
timing &= ~0x870F;
timing |= mwdma_bits[speed];
} else {
@@ -389,7 +428,7 @@ static void sis_66_set_dmamode (struct ata_port *ap, struct ata_device *adev)
* @adev: Device to program
*
* Set UDMA/MWDMA mode for device, in host controller PCI config space.
- * Handles UDMA66 and early UDMA100 devices.
+ * Handles later UDMA100 devices.
*
* LOCKING:
* None (inherited from caller).
@@ -400,21 +439,25 @@ static void sis_100_set_dmamode (struct ata_port *ap, struct ata_device *adev)
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int speed = adev->dma_mode - XFER_MW_DMA_0;
int drive_pci = sis_old_port_base(adev);
- u8 timing;
+ u16 timing;

- const u8 udma_bits[] = { 0x8B, 0x87, 0x85, 0x83, 0x82, 0x81};
+ const u16 udma_bits[] = {
+ 0x8B00, 0x8700, 0x8500, 0x8300, 0x8200, 0x8100};
+ const u8 mwdma_bits[] = { 0x08, 0x32, 0x31 };

- pci_read_config_byte(pdev, drive_pci + 1, &timing);
+ pci_read_config_word(pdev, drive_pci, &timing);

if (adev->dma_mode < XFER_UDMA_0) {
- /* NOT SUPPORTED YET: NEED DATA SHEET. DITTO IN OLD DRIVER */
+ speed = mwdma_clip_to_pio(adev);
+ timing &= ~0x80FF;
+ timing |= mwdma_bits[speed];
} else {
/* Bit 7 is UDMA on/off, bit 0-3 are cycle time */
speed = adev->dma_mode - XFER_UDMA_0;
- timing &= ~0x8F;
+ timing &= ~0x8F00;
timing |= udma_bits[speed];
}
- pci_write_config_byte(pdev, drive_pci + 1, timing);
+ pci_write_config_word(pdev, drive_pci, timing);
}

/**
@@ -434,21 +477,26 @@ static void sis_133_early_set_dmamode (struct ata_port *ap, struct ata_device *a
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int speed = adev->dma_mode - XFER_MW_DMA_0;
int drive_pci = sis_old_port_base(adev);
- u8 timing;
- /* Low 4 bits are timing */
- static const u8 udma_bits[] = { 0x8F, 0x8A, 0x87, 0x85, 0x83, 0x82, 0x81};
+ u16 timing;
+ /* Bits 15-12 are timing */
+ static const u16 udma_bits[] = {
+ 0x8F00, 0x8A00, 0x8700, 0x8500, 0x8300, 0x8200, 0x8100
+ };
+ static const u8 mwdma_bits[] = { 0x08, 0x32, 0x31 };

- pci_read_config_byte(pdev, drive_pci + 1, &timing);
+ pci_read_config_word(pdev, drive_pci, &timing);

if (adev->dma_mode < XFER_UDMA_0) {
- /* NOT SUPPORTED YET: NEED DATA SHEET. DITTO IN OLD DRIVER */
+ speed = mwdma_clip_to_pio(adev);
+ timing &= ~0x80FF;
+ timing = mwdma_bits[speed];
} else {
/* Bit 7 is UDMA on/off, bit 0-3 are cycle time */
speed = adev->dma_mode - XFER_UDMA_0;
- timing &= ~0x8F;
+ timing &= ~0x8F00;
timing |= udma_bits[speed];
}
- pci_write_config_byte(pdev, drive_pci + 1, timing);
+ pci_write_config_word(pdev, drive_pci, timing);
}

/**
@@ -479,13 +527,12 @@ static void sis_133_set_dmamode (struct ata_port *ap, struct ata_device *adev)
if (reg54 & 0x40000000)
port = 0x70;
port += (8 * ap->port_no) + (4 * adev->devno);
-
pci_read_config_dword(pdev, port, &t1);

if (adev->dma_mode < XFER_UDMA_0) {
- t1 &= ~0x00000004;
- /* FIXME: need data sheet to add MWDMA here. Also lacking on
- ide/pci driver */
+ speed = mwdma_clip_to_pio(adev);
+ sis_133_do_piomode(ap, adev, speed);
+ t1 &= ~4; /* UDMA off */
} else {
speed = adev->dma_mode - XFER_UDMA_0;
/* if & 8 no UDMA133 - need info for ... */