diff options
author | Alan Cox <alan@linux.intel.com> | 2009-11-30 13:22:49 (GMT) |
---|---|---|
committer | Jeff Garzik <jgarzik@redhat.com> | 2009-12-03 07:46:36 (GMT) |
commit | f20941f334d8fdb6b598658979709b4e94cd034b (patch) | |
tree | 1ccca93ec755dea8555c0981e0011dd3e421e286 /drivers/ata/pata_sis.c | |
parent | 10734fc8d5fbf89e88519d72e58cce83be21941a (diff) | |
download | linux-fsl-qoriq-f20941f334d8fdb6b598658979709b4e94cd034b.tar.xz |
pata_sis: Implement MWDMA for the UDMA 133 capable chips
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>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/pata_sis.c')
-rw-r--r-- | 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 ... */ |