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[libata] sata_sil: disable DMA engine in sil_freeze()

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We must disable the DMA engine before accessing taskfile registers.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Jeff Garzik 2009-04-07 19:18:32 -04:00 committed by Jeff Garzik
parent 54c38444fa
commit 2fc37adba0
1 changed files with 13 additions and 0 deletions
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13
drivers/ata/sata_sil.c
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@ -565,6 +565,19 @@ static void sil_freeze(struct ata_port *ap)
tmp |= SIL_MASK_IDE0_INT << ap->port_no;
writel(tmp, mmio_base + SIL_SYSCFG);
readl(mmio_base + SIL_SYSCFG); /* flush */
/* Ensure DMA_ENABLE is off.
*
* This is because the controller will not give us access to the
* taskfile registers while a DMA is in progress
*/
iowrite8(ioread8(ap->ioaddr.bmdma_addr) & ~SIL_DMA_ENABLE,
ap->ioaddr.bmdma_addr);
/* According to ata_bmdma_stop, an HDMA transition requires
* on PIO cycle. But we can't read a taskfile register.
*/
ioread8(ap->ioaddr.bmdma_addr);
}
static void sil_thaw(struct ata_port *ap)