diff options
Diffstat (limited to 'drivers/scsi/libata-bmdma.c')
| -rw-r--r-- | drivers/scsi/libata-bmdma.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/scsi/libata-bmdma.c b/drivers/scsi/libata-bmdma.c index a93336adcd2..96b4d2160df 100644 --- a/drivers/scsi/libata-bmdma.c +++ b/drivers/scsi/libata-bmdma.c @@ -214,6 +214,8 @@ static void ata_exec_command_pio(struct ata_port *ap, const struct ata_taskfile * Issues MMIO write to ATA command register, with proper * synchronization with interrupt handler / other threads. * + * FIXME: missing write posting for 400nS delay enforcement + * * LOCKING: * spin_lock_irqsave(host_set lock) */ @@ -648,6 +650,7 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info, goto err_out_regions; } + /* FIXME: If we get no DMA mask we should fall back to PIO */ rc = pci_set_dma_mask(pdev, ATA_DMA_MASK); if (rc) goto err_out_regions; @@ -699,5 +702,41 @@ err_out: return rc; } +/** + * ata_pci_clear_simplex - attempt to kick device out of simplex + * @pdev: PCI device + * + * Some PCI ATA devices report simplex mode but in fact can be told to + * enter non simplex mode. This implements the neccessary logic to + * perform the task on such devices. Calling it on other devices will + * have -undefined- behaviour. + */ + +int ata_pci_clear_simplex(struct pci_dev *pdev) +{ + unsigned long bmdma = pci_resource_start(pdev, 4); + u8 simplex; + + if (bmdma == 0) + return -ENOENT; + + simplex = inb(bmdma + 0x02); + outb(simplex & 0x60, bmdma + 0x02); + simplex = inb(bmdma + 0x02); + if (simplex & 0x80) + return -EOPNOTSUPP; + return 0; +} + +unsigned long ata_pci_default_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long xfer_mask) +{ + /* Filter out DMA modes if the device has been configured by + the BIOS as PIO only */ + + if (ap->ioaddr.bmdma_addr == 0) + xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA); + return xfer_mask; +} + #endif /* CONFIG_PCI */ |