Falco: Patch to enable correct port clock selection for dp

This is required only for haswell since the register configs have changed.
Also, created mainboard specific header file

Original-Change-Id: I61bf8d7cef1f204735a2f72225c48d6e44a99945
Signed-off-by: Furquan Shaikh <furquan@google.com>

Conflicts:
	src/mainboard/google/slippy/gma.c
	src/mainboard/google/slippy/i915io.c

Conflicts:
	src/mainboard/google/slippy/gma.c
Change-Id: I77f2542ca8228358f59aafd99c0d13168ab47fb5
Reviewed-on: https://gerrit.chromium.org/gerrit/66853
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
(cherry picked from commit 77f9d1ddd4376e2a290d466f0669a43997492c8e)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6602
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/slippy/gma.c

@@ -43,6 +43,7 @@
 #include <cpu/x86/msr.h>
 #include <edid.h>
 #include <drivers/intel/gma/i915.h>
+#include "mainboard.h"
 
 /*
  * Here is the rough outline of how we bring up the display:
@@ -228,7 +229,6 @@ int intel_dp_bw_code_to_link_rate(u8 link_bw)
 	}
 }
 
-void mainboard_train_link(struct intel_dp *intel_dp);
 void mainboard_train_link(struct intel_dp *intel_dp)
 {
 	u8 read_val;
@@ -281,6 +281,29 @@ static void test_gfx(struct intel_dp *dp)
 static void test_gfx(struct intel_dp *dp) {}
 #endif
 
+
+void mainboard_set_port_clk_dp(struct intel_dp *intel_dp)
+{
+	u32 ddi_pll_sel = 0;
+
+	switch (intel_dp->link_bw) {
+	case DP_LINK_BW_1_62:
+		ddi_pll_sel = PORT_CLK_SEL_LCPLL_810;
+		break;
+	case DP_LINK_BW_2_7:
+		ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350;
+		break;
+	case DP_LINK_BW_5_4:
+		ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700;
+		break;
+	default:
+		printk(BIOS_ERR, "invalid link bw %d\n", intel_dp->link_bw);
+		return;
+	}
+
+	gtt_write(PORT_CLK_SEL(intel_dp->port), ddi_pll_sel);
+}
+
 int i915lightup(unsigned int pphysbase, unsigned int pmmio,
 		unsigned int pgfx, unsigned int init_fb)
 {

src/mainboard/google/slippy/i915io.c

@@ -26,6 +26,7 @@
 #include <delay.h>
 #include <drivers/intel/gma/i915.h>
 #include <arch/io.h>
+#include "mainboard.h"
 
 /* these variables will be removed when the proper support is finished in src/drivers/intel/gma/intel_dp.c */
 int index;
@@ -33,8 +34,6 @@ u32 auxout;
 u8 auxin[20];
 u8 msg[32];
 
-extern void mainboard_train_link(struct intel_dp *intel_dp);
-
 /* this function will either be renamed or subsumed into ./gma.c:i915_lightup */
 void runio(struct intel_dp *dp);
 
@@ -71,7 +70,7 @@ void runio(struct intel_dp *dp)
 	gtt_write(PIPECONF(dp->transcoder),0x00000000);
 	gtt_write(PCH_TRANSCONF(dp->pipe),0x00000000);
 
-	gtt_write(PORT_CLK_SEL(dp->port),PORT_CLK_SEL_LCPLL_1350);
+	mainboard_set_port_clk_dp(dp);
 	gtt_write(DSPSTRIDE(dp->plane),dp->stride);
 	gtt_write(DSPCNTR(dp->plane),DISPLAY_PLANE_ENABLE|DISPPLANE_RGBX888);
 	gtt_write(DEIIR,0x00000080);

src/mainboard/google/slippy/mainboard.h

@@ -0,0 +1,25 @@
+/*
+* This file is part of the coreboot project.
+*
+* Copyright 2013 Google Inc.
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; version 2 of the License.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#ifndef __MAINBOARD_H_
+#define __MAINBOARD_H_
+void mainboard_train_link(struct intel_dp *intel_dp);
+void mainboard_set_port_clk_dp(struct intel_dp *intel_dp);
+
+#endif