diff options
| author | Timothy Pearson <tpearson@raptorengineeringinc.com> | 2015-11-24 14:11:56 -0600 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-01-29 17:04:32 +0100 |
| commit | 40e1fac56a8e2b91418929afbbfea533662443c7 (patch) | |
| tree | 6e3b3557c682be0a05a59d96b3f64f2048cc11b8 /src | |
| parent | e10d07e336569ff5abbc3fbbffeeccbb165de681 (diff) | |
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>
Diffstat (limited to 'src')
| -rw-r--r-- | src/southbridge/amd/sb700/sm.c | 20 |
1 files changed, 17 insertions, 3 deletions
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); |