southbridge/amd/sb700: Add CMOS option to disable legacy USB support
Change-Id: I136c259136ce66a0c319a965ae0ee27f66dce1b3 Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com> Reviewed-on: https://review.coreboot.org/13155 Tested-by: build bot (Jenkins) Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com> Reviewed-by: Martin Roth <martinroth@google.com>
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@ -66,6 +66,7 @@ static void sm_init(device_t dev)
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u32 dword;
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void *ioapic_base;
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uint32_t power_state;
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uint32_t enable_legacy_usb;
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u32 nmi_option;
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printk(BIOS_INFO, "sm_init().\n");
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@ -75,10 +76,23 @@ static void sm_init(device_t dev)
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ioapic_base = (void *)(pci_read_config32(dev, 0x74) & (0xffffffe0));
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setup_ioapic(ioapic_base, 0); /* Don't rename IOAPIC ID. */
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enable_legacy_usb = 1;
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get_option(&enable_legacy_usb, "enable_legacy_usb");
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/* 2.10 Interrupt Routing/Filtering */
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dword = pci_read_config8(dev, 0x62);
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dword |= 3;
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pci_write_config8(dev, 0x62, dword);
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byte = pci_read_config8(dev, 0x62);
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if (enable_legacy_usb)
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byte |= 0x3;
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else
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byte &= ~0x3;
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pci_write_config8(dev, 0x62, byte);
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byte = pci_read_config8(dev, 0x67);
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if (enable_legacy_usb)
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byte |= 0x1 << 7;
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else
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byte &= ~(0x1 << 7);
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pci_write_config8(dev, 0x67, byte);
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/* Delay back to back interrupts to the CPU. */
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dword = pci_read_config16(dev, 0x64);
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