diff options
| author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-10-13 21:39:42 +0200 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-10-13 21:39:42 +0200 |
| commit | bfa7d8e55f0c5ae22ef57eb22942c74fdde7b9bd (patch) | |
| tree | 2e21bf3c435a6a6646dd720652e33f0aacdb7b85 /drivers/ide/pci/piix.c | |
| parent | a9ab09e26055a76295548ca36ec00de2f4367d32 (diff) | |
ide: ->ide_dma_clear_irq() -> ->clear_irq()
* Rename ->ide_dma_clear_irq method to ->clear_irq
and move it from ide_hwif_t to struct ide_port_ops.
* Move ->waiting_for_dma check inside ->clear_irq method.
* Move ->dma_base check inside ->clear_irq method.
piix.c:
* Add ich_port_ops and remove init_hwif_ich() wrapper.
There should be no functional changes caused by this patch.
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/pci/piix.c')
| -rw-r--r-- | drivers/ide/pci/piix.c | 39 |
1 files changed, 23 insertions, 16 deletions
diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c index a909684ee61..56feb939f82 100644 --- a/drivers/ide/pci/piix.c +++ b/drivers/ide/pci/piix.c @@ -215,17 +215,26 @@ static unsigned int init_chipset_ich(struct pci_dev *dev) } /** - * piix_dma_clear_irq - clear BMDMA status - * @drive: IDE drive to clear + * ich_clear_irq - clear BMDMA status + * @drive: IDE drive * - * Called from ide_intr() for PIO interrupts - * to clear BMDMA status as needed by ICHx + * ICHx contollers set DMA INTR no matter DMA or PIO. + * BMDMA status might need to be cleared even for + * PIO interrupts to prevent spurious/lost IRQ. */ -static void piix_dma_clear_irq(ide_drive_t *drive) +static void ich_clear_irq(ide_drive_t *drive) { ide_hwif_t *hwif = HWIF(drive); u8 dma_stat; + /* + * ide_dma_end() needs BMDMA status for error checking. + * So, skip clearing BMDMA status here and leave it + * to ide_dma_end() if this is DMA interrupt. + */ + if (drive->waiting_for_dma || hwif->dma_base == 0) + return; + /* clear the INTR & ERROR bits */ dma_stat = inb(hwif->dma_base + ATA_DMA_STATUS); /* Should we force the bit as well ? */ @@ -293,21 +302,19 @@ static void __devinit init_hwif_piix(ide_hwif_t *hwif) hwif->ultra_mask = hwif->mwdma_mask = hwif->swdma_mask = 0; } -static void __devinit init_hwif_ich(ide_hwif_t *hwif) -{ - init_hwif_piix(hwif); - - /* ICHx need to clear the BMDMA status for all interrupts */ - if (hwif->dma_base) - hwif->ide_dma_clear_irq = &piix_dma_clear_irq; -} - static const struct ide_port_ops piix_port_ops = { .set_pio_mode = piix_set_pio_mode, .set_dma_mode = piix_set_dma_mode, .cable_detect = piix_cable_detect, }; +static const struct ide_port_ops ich_port_ops = { + .set_pio_mode = piix_set_pio_mode, + .set_dma_mode = piix_set_dma_mode, + .clear_irq = ich_clear_irq, + .cable_detect = piix_cable_detect, +}; + #ifndef CONFIG_IA64 #define IDE_HFLAGS_PIIX IDE_HFLAG_LEGACY_IRQS #else @@ -331,9 +338,9 @@ static const struct ide_port_ops piix_port_ops = { { \ .name = DRV_NAME, \ .init_chipset = init_chipset_ich, \ - .init_hwif = init_hwif_ich, \ + .init_hwif = init_hwif_piix, \ .enablebits = {{0x41,0x80,0x80}, {0x43,0x80,0x80}}, \ - .port_ops = &piix_port_ops, \ + .port_ops = &ich_port_ops, \ .host_flags = IDE_HFLAGS_PIIX, \ .pio_mask = ATA_PIO4, \ .swdma_mask = ATA_SWDMA2_ONLY, \ |