Commit 942e4c16 authored by David S. Miller's avatar David S. Miller

[SPARC64]: Get ALI trident sound working again.

parent 2c692c65
......@@ -784,6 +784,26 @@ void pci_dma_sync_sg(struct pci_dev *pdev, struct scatterlist *sglist, int nelem
spin_unlock_irqrestore(&iommu->lock, flags);
}
static void ali_sound_dma_hack(struct pci_dev *pdev, int set_bit)
{
struct pci_dev *ali_isa_bridge;
u8 val;
/* ALI sound chips generate 31-bits of DMA, a special register
* determines what bit 31 is emitted as.
*/
ali_isa_bridge = pci_find_device(PCI_VENDOR_ID_AL,
PCI_DEVICE_ID_AL_M1533,
NULL);
pci_read_config_byte(ali_isa_bridge, 0x7e, &val);
if (set_bit)
val |= 0x01;
else
val &= ~0x01;
pci_write_config_byte(ali_isa_bridge, 0x7e, val);
}
int pci_dma_supported(struct pci_dev *pdev, u64 device_mask)
{
struct pcidev_cookie *pcp = pdev->sysdata;
......@@ -795,6 +815,14 @@ int pci_dma_supported(struct pci_dev *pdev, u64 device_mask)
struct pci_iommu *iommu = pcp->pbm->iommu;
dma_addr_mask = iommu->dma_addr_mask;
if (pdev->vendor == PCI_VENDOR_ID_AL &&
pdev->device == PCI_DEVICE_ID_AL_M5451 &&
device_mask == 0x7fffffff) {
ali_sound_dma_hack(pdev,
(dma_addr_mask & 0x80000000) != 0);
return 1;
}
}
return (device_mask & dma_addr_mask) == dma_addr_mask;
......
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