From 40e1fac56a8e2b91418929afbbfea533662443c7 Mon Sep 17 00:00:00 2001 From: Timothy Pearson Date: Tue, 24 Nov 2015 14:11:56 -0600 Subject: southbridge/amd/sb700: Add CMOS option to disable legacy USB support Change-Id: I136c259136ce66a0c319a965ae0ee27f66dce1b3 Signed-off-by: Timothy Pearson Reviewed-on: https://review.coreboot.org/13155 Tested-by: build bot (Jenkins) Tested-by: Raptor Engineering Automated Test Stand Reviewed-by: Martin Roth --- src/southbridge/amd/sb700/sm.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) (limited to 'src') diff --git a/src/southbridge/amd/sb700/sm.c b/src/southbridge/amd/sb700/sm.c index 7c9c004cd3..5f6d20e688 100644 --- a/src/southbridge/amd/sb700/sm.c +++ b/src/southbridge/amd/sb700/sm.c @@ -66,6 +66,7 @@ static void sm_init(device_t dev) u32 dword; void *ioapic_base; uint32_t power_state; + uint32_t enable_legacy_usb; u32 nmi_option; printk(BIOS_INFO, "sm_init().\n"); @@ -75,10 +76,23 @@ static void sm_init(device_t dev) ioapic_base = (void *)(pci_read_config32(dev, 0x74) & (0xffffffe0)); setup_ioapic(ioapic_base, 0); /* Don't rename IOAPIC ID. */ + enable_legacy_usb = 1; + get_option(&enable_legacy_usb, "enable_legacy_usb"); + /* 2.10 Interrupt Routing/Filtering */ - dword = pci_read_config8(dev, 0x62); - dword |= 3; - pci_write_config8(dev, 0x62, dword); + byte = pci_read_config8(dev, 0x62); + if (enable_legacy_usb) + byte |= 0x3; + else + byte &= ~0x3; + pci_write_config8(dev, 0x62, byte); + + byte = pci_read_config8(dev, 0x67); + if (enable_legacy_usb) + byte |= 0x1 << 7; + else + byte &= ~(0x1 << 7); + pci_write_config8(dev, 0x67, byte); /* Delay back to back interrupts to the CPU. */ dword = pci_read_config16(dev, 0x64); -- cgit v1.2.3