From f060f27007b393bac6e50ee6fc26d8505acf6fe4 Mon Sep 17 00:00:00 2001
From: Andres Salomon <dilinger@collabora.co.uk>
Date: Mon, 14 Dec 2009 18:00:40 -0800
Subject: cs5535: move VSA2 checks into linux/cs5535.h

Signed-off-by: Andres Salomon <dilinger@collabora.co.uk>
Cc: Jordan Crouse <jordan@cosmicpenguin.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Chris Ball <cjb@laptop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/cs5535.h | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'include/linux/cs5535.h')

diff --git a/include/linux/cs5535.h b/include/linux/cs5535.h
index 39e93e8ed95d..eb34108a608b 100644
--- a/include/linux/cs5535.h
+++ b/include/linux/cs5535.h
@@ -36,6 +36,38 @@
 #define LBAR_ACPI_SIZE		0x40
 #define LBAR_PMS_SIZE		0x80
 
+/* 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_VR_MEM_SIZE		0x0200
+#define AMD_VSA_SIG		0x4132  /* signature is ascii 'VSA2' */
+#define GSW_VSA_SIG		0x534d  /* General Software signature */
+
+#include <linux/io.h>
+
+static inline int cs5535_has_vsa2(void)
+{
+	static int has_vsa2 = -1;
+
+	if (has_vsa2 == -1) {
+		uint16_t val;
+
+		/*
+		 * 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);
+
+		val = inw(VSA_VRC_DATA);
+		has_vsa2 = (val == AMD_VSA_SIG || val == GSW_VSA_SIG);
+	}
+
+	return has_vsa2;
+}
+
 /* GPIOs */
 #define GPIO_OUTPUT_VAL		0x00
 #define GPIO_OUTPUT_ENABLE	0x04
-- 
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