From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 drivers/video/kyro/STG4000Ramdac.c | 163 +++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 drivers/video/kyro/STG4000Ramdac.c

(limited to 'drivers/video/kyro/STG4000Ramdac.c')

diff --git a/drivers/video/kyro/STG4000Ramdac.c b/drivers/video/kyro/STG4000Ramdac.c
new file mode 100644
index 00000000..e6ad037e
--- /dev/null
+++ b/drivers/video/kyro/STG4000Ramdac.c
@@ -0,0 +1,163 @@
+/*
+ *  linux/drivers/video/kyro/STG4000Ramdac.c
+ *
+ *  Copyright (C) 2002 STMicroelectronics
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <video/kyro.h>
+
+#include "STG4000Reg.h"
+#include "STG4000Interface.h"
+
+static u32 STG_PIXEL_BUS_WIDTH = 128;	/* 128 bit bus width      */
+static u32 REF_CLOCK = 14318;
+
+int InitialiseRamdac(volatile STG4000REG __iomem * pSTGReg,
+		     u32 displayDepth,
+		     u32 displayWidth,
+		     u32 displayHeight,
+		     s32 HSyncPolarity,
+		     s32 VSyncPolarity, u32 * pixelClock)
+{
+	u32 tmp = 0;
+	u32 F = 0, R = 0, P = 0;
+	u32 stride = 0;
+	u32 ulPdiv = 0;
+	u32 physicalPixelDepth = 0;
+	/* Make sure DAC is in Reset */
+	tmp = STG_READ_REG(SoftwareReset);
+
+	if (tmp & 0x1) {
+		CLEAR_BIT(1);
+		STG_WRITE_REG(SoftwareReset, tmp);
+	}
+
+	/* Set Pixel Format */
+	tmp = STG_READ_REG(DACPixelFormat);
+	CLEAR_BITS_FRM_TO(0, 2);
+
+	/* Set LUT not used from 16bpp to 32 bpp ??? */
+	CLEAR_BITS_FRM_TO(8, 9);
+
+	switch (displayDepth) {
+	case 16:
+		{
+			physicalPixelDepth = 16;
+			tmp |= _16BPP;
+			break;
+		}
+	case 32:
+		{
+			/* Set for 32 bits per pixel */
+			physicalPixelDepth = 32;
+			tmp |= _32BPP;
+			break;
+		}
+	default:
+		return -EINVAL;
+	}
+
+	STG_WRITE_REG(DACPixelFormat, tmp);
+
+	/* Workout Bus transfer bandwidth according to pixel format */
+	ulPdiv = STG_PIXEL_BUS_WIDTH / physicalPixelDepth;
+
+	/* Get Screen Stride in pixels */
+	stride = displayWidth;
+
+	/* Set Primary size info */
+	tmp = STG_READ_REG(DACPrimSize);
+	CLEAR_BITS_FRM_TO(0, 10);
+	CLEAR_BITS_FRM_TO(12, 31);
+	tmp |=
+	    ((((displayHeight - 1) << 12) | (((displayWidth / ulPdiv) -
+					      1) << 23))
+	     | (stride / ulPdiv));
+	STG_WRITE_REG(DACPrimSize, tmp);
+
+
+	/* Set Pixel Clock */
+	*pixelClock = ProgramClock(REF_CLOCK, *pixelClock, &F, &R, &P);
+
+	/* Set DAC PLL Mode */
+	tmp = STG_READ_REG(DACPLLMode);
+	CLEAR_BITS_FRM_TO(0, 15);
+	/* tmp |= ((P-1) | ((F-2) << 2) | ((R-2) << 11)); */
+	tmp |= ((P) | ((F - 2) << 2) | ((R - 2) << 11));
+	STG_WRITE_REG(DACPLLMode, tmp);
+
+	/* Set Prim Address */
+	tmp = STG_READ_REG(DACPrimAddress);
+	CLEAR_BITS_FRM_TO(0, 20);
+	CLEAR_BITS_FRM_TO(20, 31);
+	STG_WRITE_REG(DACPrimAddress, tmp);
+
+	/* Set Cursor details with HW Cursor disabled */
+	tmp = STG_READ_REG(DACCursorCtrl);
+	tmp &= ~SET_BIT(31);
+	STG_WRITE_REG(DACCursorCtrl, tmp);
+
+	tmp = STG_READ_REG(DACCursorAddr);
+	CLEAR_BITS_FRM_TO(0, 20);
+	STG_WRITE_REG(DACCursorAddr, tmp);
+
+	/* Set Video Window */
+	tmp = STG_READ_REG(DACVidWinStart);
+	CLEAR_BITS_FRM_TO(0, 10);
+	CLEAR_BITS_FRM_TO(16, 26);
+	STG_WRITE_REG(DACVidWinStart, tmp);
+
+	tmp = STG_READ_REG(DACVidWinEnd);
+	CLEAR_BITS_FRM_TO(0, 10);
+	CLEAR_BITS_FRM_TO(16, 26);
+	STG_WRITE_REG(DACVidWinEnd, tmp);
+
+	/* Set DAC Border Color to default */
+	tmp = STG_READ_REG(DACBorderColor);
+	CLEAR_BITS_FRM_TO(0, 23);
+	STG_WRITE_REG(DACBorderColor, tmp);
+
+	/* Set Graphics and Overlay Burst Control */
+	STG_WRITE_REG(DACBurstCtrl, 0x0404);
+
+	/* Set CRC Trigger to default */
+	tmp = STG_READ_REG(DACCrcTrigger);
+	CLEAR_BIT(0);
+	STG_WRITE_REG(DACCrcTrigger, tmp);
+
+	/* Set Video Port Control to default */
+	tmp = STG_READ_REG(DigVidPortCtrl);
+	CLEAR_BIT(8);
+	CLEAR_BITS_FRM_TO(16, 27);
+	CLEAR_BITS_FRM_TO(1, 3);
+	CLEAR_BITS_FRM_TO(10, 11);
+	STG_WRITE_REG(DigVidPortCtrl, tmp);
+
+	return 0;
+}
+
+/* Ramdac control, turning output to the screen on and off */
+void DisableRamdacOutput(volatile STG4000REG __iomem * pSTGReg)
+{
+	u32 tmp;
+
+	/* Disable DAC for Graphics Stream Control */
+	tmp = (STG_READ_REG(DACStreamCtrl)) & ~SET_BIT(0);
+	STG_WRITE_REG(DACStreamCtrl, tmp);
+}
+
+void EnableRamdacOutput(volatile STG4000REG __iomem * pSTGReg)
+{
+	u32 tmp;
+
+	/* Enable DAC for Graphics Stream Control */
+	tmp = (STG_READ_REG(DACStreamCtrl)) | SET_BIT(0);
+	STG_WRITE_REG(DACStreamCtrl, tmp);
+}
-- 
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