[PATCH 14/41] drm/i915: add support for SBI ops

[Eugeni Dodonov <eugeni.dodonov@intel.com>]

With Lynx Point, we need to use SBI to communicate with the display clock
control. This commit adds helper functions to access the registers via
SBI.

v2: de-inline the function and address changes in bits names

v1 Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>

Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   44 ++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a0e3166..8e5f5be 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1220,6 +1220,50 @@ static void intel_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
 	POSTING_READ(reg);
 }
 
+/* SBI access */
+static void
+intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value)
+{
+	if (wait_for((I915_READ(SBI_CTL_STAT) & SBI_READY) == 0,
+				10))
+		DRM_ERROR("timeout waiting for SBI to become ready\n");
+
+	I915_WRITE(SBI_ADDR,
+			(reg << 16));
+	I915_WRITE(SBI_DATA,
+			value);
+	I915_WRITE(SBI_CTL_STAT,
+			SBI_BUSY |
+			SBI_CTL_OP_CRWR);
+
+	if (wait_for((I915_READ(SBI_CTL_STAT) & (SBI_READY | SBI_RESPONSE_SUCCESS)) == 0,
+				10))
+		DRM_ERROR("timeout waiting for SBI to complete write transaction\n");
+}
+
+static u32
+intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg)
+{
+	u32 value;
+	if (wait_for((I915_READ(SBI_CTL_STAT) & SBI_READY) == 0,
+				10))
+		DRM_ERROR("timeout waiting for SBI to become ready\n");
+
+	I915_WRITE(SBI_ADDR,
+			(reg << 16));
+	I915_WRITE(SBI_CTL_STAT,
+			SBI_BUSY |
+			SBI_CTL_OP_CRRD);
+
+	if (wait_for((I915_READ(SBI_CTL_STAT) & (SBI_READY | SBI_RESPONSE_SUCCESS)) == 0,
+				10))
+		DRM_ERROR("timeout waiting for SBI to complete read transaction\n");
+
+	value = I915_READ(SBI_DATA);
+
+	return value;
+}
+
 /**
  * intel_enable_pch_pll - enable PCH PLL
  * @dev_priv: i915 private structure
-- 
1.7.9.5