diff options
Diffstat (limited to 'arch/x86/kernel/geode_32.c')
| -rw-r--r-- | arch/x86/kernel/geode_32.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/kernel/geode_32.c b/arch/x86/kernel/geode_32.c index 9dad6ca6cd70..e8edd63ab000 100644 --- a/arch/x86/kernel/geode_32.c +++ b/arch/x86/kernel/geode_32.c @@ -161,6 +161,25 @@ void geode_gpio_setup_event(unsigned int gpio, int pair, int pme) } EXPORT_SYMBOL_GPL(geode_gpio_setup_event); +int geode_has_vsa2(void) +{ + static int has_vsa2 = -1; + + if (has_vsa2 == -1) { + /* + * The VSA has virtual registers that we can query for a + * signature. + */ + outw(VSA_VR_UNLOCK, VSA_VRC_INDEX); + outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX); + + has_vsa2 = (inw(VSA_VRC_DATA) == VSA_SIG); + } + + return has_vsa2; +} +EXPORT_SYMBOL_GPL(geode_has_vsa2); + static int __init geode_southbridge_init(void) { if (!is_geode()) |