diff options
| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2007-03-08 23:22:59 +0000 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-04-28 14:15:58 -0400 |
| commit | 432729f0b0c299ae9731aaa31beaa0dd3a9751eb (patch) | |
| tree | 39a9cc9762136e2f049b6081637b6daf5fa1e882 | |
| parent | 04351821b43e6c0c91ad50d7e4be54a935f749e1 (diff) | |
libata-core: Fix the iordy methods
This alone isn't sufficient to save the universe from prehistoric disks
and controllers but it is a first important step. Split off a separate
function to provide a mode filter when controller iordy is not available.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
| -rw-r--r-- | drivers/ata/libata-core.c | 36 |
1 files changed, 25 insertions, 11 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 14b469f7b23..d01bb5d50fc 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -1379,30 +1379,44 @@ unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd) * Check if the current speed of the device requires IORDY. Used * by various controllers for chip configuration. */ - + unsigned int ata_pio_need_iordy(const struct ata_device *adev) { - int pio; - int speed = adev->pio_mode - XFER_PIO_0; - - if (speed < 2) + /* Controller doesn't support IORDY. Probably a pointless check + as the caller should know this */ + if (adev->ap->flags & ATA_FLAG_NO_IORDY) return 0; - if (speed > 2) + /* PIO3 and higher it is mandatory */ + if (adev->pio_mode > XFER_PIO_2) return 1; + /* We turn it on when possible */ + if (ata_id_has_iordy(adev->id)) + return 1; + return 0; +} +/** + * ata_pio_mask_no_iordy - Return the non IORDY mask + * @adev: ATA device + * + * Compute the highest mode possible if we are not using iordy. Return + * -1 if no iordy mode is available. + */ + +static u32 ata_pio_mask_no_iordy(const struct ata_device *adev) +{ /* If we have no drive specific rule, then PIO 2 is non IORDY */ - if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */ - pio = adev->id[ATA_ID_EIDE_PIO]; + u16 pio = adev->id[ATA_ID_EIDE_PIO]; /* Is the speed faster than the drive allows non IORDY ? */ if (pio) { /* This is cycle times not frequency - watch the logic! */ if (pio > 240) /* PIO2 is 240nS per cycle */ - return 1; - return 0; + return 3 << ATA_SHIFT_PIO; + return 7 << ATA_SHIFT_PIO; } } - return 0; + return 3 << ATA_SHIFT_PIO; } /** |