diff options
Diffstat (limited to 'arch/x86/cpu/ivybridge/northbridge.c')
| -rw-r--r-- | arch/x86/cpu/ivybridge/northbridge.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/x86/cpu/ivybridge/northbridge.c b/arch/x86/cpu/ivybridge/northbridge.c index 39bab7bdf3..a809b823b3 100644 --- a/arch/x86/cpu/ivybridge/northbridge.c +++ b/arch/x86/cpu/ivybridge/northbridge.c @@ -177,6 +177,35 @@ static void sandybridge_setup_northbridge_bars(struct udevice *dev) dm_pci_write_config8(dev, PAM6, 0x33); } +/** + * sandybridge_init_iommu() - Set up IOMMU so that azalia can be used + * + * It is not obvious where these values come from. They may be undocumented. + */ +static void sandybridge_init_iommu(struct udevice *dev) +{ + u32 capid0_a; + + dm_pci_read_config32(dev, 0xe4, &capid0_a); + if (capid0_a & (1 << 23)) { + log_debug("capid0_a not needed\n"); + return; + } + + /* setup BARs */ + writel(IOMMU_BASE1 >> 32, MCHBAR_REG(0x5404)); + writel(IOMMU_BASE1 | 1, MCHBAR_REG(0x5400)); + writel(IOMMU_BASE2 >> 32, MCHBAR_REG(0x5414)); + writel(IOMMU_BASE2 | 1, MCHBAR_REG(0x5410)); + + /* lock policies */ + writel(0x80000000, IOMMU_BASE1 + 0xff0); + + /* Enable azalia sound */ + writel(0x20000000, IOMMU_BASE2 + 0xff0); + writel(0xa0000000, IOMMU_BASE2 + 0xff0); +} + static int bd82x6x_northbridge_early_init(struct udevice *dev) { const int chipset_type = SANDYBRIDGE_MOBILE; @@ -197,6 +226,9 @@ static int bd82x6x_northbridge_early_init(struct udevice *dev) sandybridge_setup_northbridge_bars(dev); + /* Setup IOMMU BARs */ + sandybridge_init_iommu(dev); + /* Device Enable */ dm_pci_write_config32(dev, DEVEN, DEVEN_HOST | DEVEN_IGD); |