diff options
author | Jeff Garzik <jeff@garzik.org> | 2009-04-07 19:18:32 -0400 |
---|---|---|
committer | Jeff Garzik <jgarzik@redhat.com> | 2009-09-01 19:47:19 -0400 |
commit | 2fc37adba0fb05760b8635c6706773af828ccf3c (patch) | |
tree | 821acd350a7e315481b0bf8f2478797dbb946588 /drivers | |
parent | 54c38444fad6a99b4b19512f8f0055d69115e69e (diff) |
[libata] sata_sil: disable DMA engine in sil_freeze()
We must disable the DMA engine before accessing taskfile registers.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/ata/sata_sil.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/ata/sata_sil.c b/drivers/ata/sata_sil.c index 35bd5cc7f285..3cb69d5fb817 100644 --- a/drivers/ata/sata_sil.c +++ b/drivers/ata/sata_sil.c | |||
@@ -565,6 +565,19 @@ static void sil_freeze(struct ata_port *ap) | |||
565 | tmp |= SIL_MASK_IDE0_INT << ap->port_no; | 565 | tmp |= SIL_MASK_IDE0_INT << ap->port_no; |
566 | writel(tmp, mmio_base + SIL_SYSCFG); | 566 | writel(tmp, mmio_base + SIL_SYSCFG); |
567 | readl(mmio_base + SIL_SYSCFG); /* flush */ | 567 | readl(mmio_base + SIL_SYSCFG); /* flush */ |
568 | |||
569 | /* Ensure DMA_ENABLE is off. | ||
570 | * | ||
571 | * This is because the controller will not give us access to the | ||
572 | * taskfile registers while a DMA is in progress | ||
573 | */ | ||
574 | iowrite8(ioread8(ap->ioaddr.bmdma_addr) & ~SIL_DMA_ENABLE, | ||
575 | ap->ioaddr.bmdma_addr); | ||
576 | |||
577 | /* According to ata_bmdma_stop, an HDMA transition requires | ||
578 | * on PIO cycle. But we can't read a taskfile register. | ||
579 | */ | ||
580 | ioread8(ap->ioaddr.bmdma_addr); | ||
568 | } | 581 | } |
569 | 582 | ||
570 | static void sil_thaw(struct ata_port *ap) | 583 | static void sil_thaw(struct ata_port *ap) |