x86: GEODE: add Virtual Systems Architecture detection

This is generic VSA2 detection.  It's used by OLPC to determine whether or not
the BIOS contains VSA2, but since other BIOSes are coming out that don't use
the VSA (ie, tinybios), it might end up being useful for others.

Signed-off-by: Andres Salomon <dilinger@debian.org>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/asm-x86/geode.h b/include/asm-x86/geode.h
index b1bdf6378563..3978200f126c 100644
--- a/include/asm-x86/geode.h
+++ b/include/asm-x86/geode.h
@@ -103,6 +103,14 @@ extern int geode_get_dev_base(unsigned int dev);
 #define PM_AWKD                 0x50
 #define PM_SSC                  0x54
 
+/* VSA2 magic values */
+
+#define VSA_VRC_INDEX           0xAC1C
+#define VSA_VRC_DATA            0xAC1E
+#define VSA_VR_UNLOCK           0xFC53  /* unlock virtual register */
+#define VSA_VR_SIGNATURE        0x0003
+#define VSA_SIG                 0x4132  /* signature is ascii 'VSA2' */
+
 /* GPIO */
 
 #define GPIO_OUTPUT_VAL         0x00
@@ -174,6 +182,17 @@ static inline int is_geode(void)
         return (is_geode_gx() || is_geode_lx());
 }
 
+/*
+ * The VSA has virtual registers that we can query for a signature.
+ */
+static inline int geode_has_vsa2(void)
+{
+        outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
+        outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX);
+
+        return (inw(VSA_VRC_DATA) == VSA_SIG);
+}
+
 /* MFGPTs */
 
 #define MFGPT_MAX_TIMERS        8