powerpc/t1040qds: Add Video - HDMI support

T1040 has internal display interface unit (DIU) for driving video.
T1040QDS supports video mode via
-LCD using TI enconder
-HDMI type interface via HDMI encoder

Chrontel, CH7301C encoder which is I2C programmable is used as
HDMI connector on T1040QDS.
This patch add support to
-enable Video interface for T1040QDS
-route qixis multiplexing to enable DIU-HDMI interface on board
-program DIU pixel clock gerenartor for T1040
-program HDMI encoder via I2C on board

Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

4 files changed, 229 insertions, 0 deletions

diff --git a/board/freescale/t1040qds/Makefile b/board/freescale/t1040qds/Makefile
index c7470d7..19ed21b 100644
--- a/board/freescale/t1040qds/Makefile
+++ b/board/freescale/t1040qds/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_PCI)     += pci.o
 obj-y	+= law.o
 obj-y	+= tlb.o
 obj-y	+= eth.o
+obj-y	+= diu.o
diff --git a/board/freescale/t1040qds/diu.c b/board/freescale/t1040qds/diu.c
new file mode 100644
index 0000000..ffd074b
--- /dev/null
+++ b/board/freescale/t1040qds/diu.c
@@ -0,0 +1,215 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ * Author: Priyanka Jain <Priyanka.Jain@freescale.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <linux/ctype.h>
+#include <asm/io.h>
+#include <stdio_dev.h>
+#include <video_fb.h>
+#include <fsl_diu_fb.h>
+#include "../common/qixis.h"
+#include "t1040qds.h"
+#include "t1040qds_qixis.h"
+#include <i2c.h>
+
+
+#define I2C_DVI_INPUT_DATA_FORMAT_REG		0x1F
+#define I2C_DVI_PLL_CHARGE_CNTL_REG		0x33
+#define I2C_DVI_PLL_DIVIDER_REG			0x34
+#define I2C_DVI_PLL_SUPPLY_CNTL_REG		0x35
+#define I2C_DVI_PLL_FILTER_REG			0x36
+#define I2C_DVI_TEST_PATTERN_REG		0x48
+#define I2C_DVI_POWER_MGMT_REG			0x49
+#define I2C_DVI_LOCK_STATE_REG			0x4D
+#define I2C_DVI_SYNC_POLARITY_REG		0x56
+
+/*
+ * Set VSYNC/HSYNC to active high. This is polarity of sync signals
+ * from DIU->DVI. The DIU default is active igh, so DVI is set to
+ * active high.
+ */
+#define I2C_DVI_INPUT_DATA_FORMAT_VAL		0x98
+
+#define I2C_DVI_PLL_CHARGE_CNTL_HIGH_SPEED_VAL	0x06
+#define I2C_DVI_PLL_DIVIDER_HIGH_SPEED_VAL	0x26
+#define I2C_DVI_PLL_FILTER_HIGH_SPEED_VAL	0xA0
+#define I2C_DVI_PLL_CHARGE_CNTL_LOW_SPEED_VAL	0x08
+#define I2C_DVI_PLL_DIVIDER_LOW_SPEED_VAL	0x16
+#define I2C_DVI_PLL_FILTER_LOW_SPEED_VAL	0x60
+
+/* Clear test pattern */
+#define I2C_DVI_TEST_PATTERN_VAL		0x18
+/* Exit Power-down mode */
+#define I2C_DVI_POWER_MGMT_VAL			0xC0
+
+/* Monitor polarity is handled via DVI Sync Polarity Register */
+#define I2C_DVI_SYNC_POLARITY_VAL		0x00
+
+/*
+ * DIU Area Descriptor
+ *
+ * Note that we need to byte-swap the value before it's written to the AD
+ * register.  So even though the registers don't look like they're in the same
+ * bit positions as they are on the MPC8610, the same value is written to the
+ * AD register on the MPC8610 and on the P1022.
+ */
+#define AD_BYTE_F		0x10000000
+#define AD_ALPHA_C_SHIFT	25
+#define AD_BLUE_C_SHIFT		23
+#define AD_GREEN_C_SHIFT	21
+#define AD_RED_C_SHIFT		19
+#define AD_PIXEL_S_SHIFT	16
+#define AD_COMP_3_SHIFT		12
+#define AD_COMP_2_SHIFT		8
+#define AD_COMP_1_SHIFT		4
+#define AD_COMP_0_SHIFT		0
+
+/* Programming of HDMI Chrontel CH7301 connector */
+int diu_set_dvi_encoder(unsigned int pixclock)
+{
+	int ret;
+	u8 temp;
+	select_i2c_ch_pca9547(I2C_MUX_CH_DIU);
+
+	temp = I2C_DVI_TEST_PATTERN_VAL;
+	ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR, I2C_DVI_TEST_PATTERN_REG, 1,
+			&temp, 1);
+	if (ret) {
+		puts("I2C: failed to select proper dvi test pattern\n");
+		return ret;
+	}
+	temp = I2C_DVI_INPUT_DATA_FORMAT_VAL;
+	ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR, I2C_DVI_INPUT_DATA_FORMAT_REG,
+			1, &temp, 1);
+	if (ret) {
+		puts("I2C: failed to select dvi input data format\n");
+		return ret;
+	}
+
+	/* Set Sync polarity register */
+	temp = I2C_DVI_SYNC_POLARITY_VAL;
+	ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR, I2C_DVI_SYNC_POLARITY_REG, 1,
+			&temp, 1);
+	if (ret) {
+		puts("I2C: failed to select dvi syc polarity\n");
+		return ret;
+	}
+
+	/* Set PLL registers based on pixel clock rate*/
+	if (pixclock > 65000000) {
+		temp = I2C_DVI_PLL_CHARGE_CNTL_HIGH_SPEED_VAL;
+		ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR,
+				I2C_DVI_PLL_CHARGE_CNTL_REG, 1,	&temp, 1);
+		if (ret) {
+			puts("I2C: failed to select dvi pll charge_cntl\n");
+			return ret;
+		}
+		temp = I2C_DVI_PLL_DIVIDER_HIGH_SPEED_VAL;
+		ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR,
+				I2C_DVI_PLL_DIVIDER_REG, 1, &temp, 1);
+		if (ret) {
+			puts("I2C: failed to select dvi pll divider\n");
+			return ret;
+		}
+		temp = I2C_DVI_PLL_FILTER_HIGH_SPEED_VAL;
+		ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR,
+				I2C_DVI_PLL_FILTER_REG, 1, &temp, 1);
+		if (ret) {
+			puts("I2C: failed to select dvi pll filter\n");
+			return ret;
+		}
+	} else {
+		temp = I2C_DVI_PLL_CHARGE_CNTL_LOW_SPEED_VAL;
+		ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR,
+				I2C_DVI_PLL_CHARGE_CNTL_REG, 1, &temp, 1);
+		if (ret) {
+			puts("I2C: failed to select dvi pll charge_cntl\n");
+			return ret;
+		}
+		temp = I2C_DVI_PLL_DIVIDER_LOW_SPEED_VAL;
+		ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR,
+				I2C_DVI_PLL_DIVIDER_REG, 1, &temp, 1);
+		if (ret) {
+			puts("I2C: failed to select dvi pll divider\n");
+			return ret;
+		}
+		temp = I2C_DVI_PLL_FILTER_LOW_SPEED_VAL;
+		ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR,
+				I2C_DVI_PLL_FILTER_REG, 1, &temp, 1);
+		if (ret) {
+			puts("I2C: failed to select dvi pll filter\n");
+			return ret;
+		}
+	}
+
+	temp = I2C_DVI_POWER_MGMT_VAL;
+	ret = i2c_write(CONFIG_SYS_I2C_DVI_ADDR, I2C_DVI_POWER_MGMT_REG, 1,
+			&temp, 1);
+	if (ret) {
+		puts("I2C: failed to select dvi power mgmt\n");
+		return ret;
+	}
+
+	udelay(500);
+
+	select_i2c_ch_pca9547(I2C_MUX_CH_DEFAULT);
+	return 0;
+}
+
+void diu_set_pixel_clock(unsigned int pixclock)
+{
+	unsigned long speed_ccb, temp;
+	u32 pixval;
+	int ret = 0;
+	speed_ccb = get_bus_freq(0);
+	temp = 1000000000 / pixclock;
+	temp *= 1000;
+	pixval = speed_ccb / temp;
+
+	/* Program HDMI encoder */
+	ret = diu_set_dvi_encoder(temp);
+	if (ret) {
+		puts("Failed to set DVI encoder\n");
+		return;
+	}
+
+	/* Program pixel clock */
+	out_be32((unsigned *)CONFIG_SYS_FSL_SCFG_PIXCLK_ADDR,
+		 ((pixval << PXCK_BITS_START) & PXCK_MASK));
+	/* enable clock*/
+	out_be32((unsigned *)CONFIG_SYS_FSL_SCFG_PIXCLK_ADDR, PXCKEN_MASK |
+		 ((pixval << PXCK_BITS_START) & PXCK_MASK));
+}
+
+int platform_diu_init(unsigned int xres, unsigned int yres, const char *port)
+{
+	u32 pixel_format;
+	u8 sw;
+
+	/*Route I2C4 to DIU system as HSYNC/VSYNC*/
+	sw = QIXIS_READ(brdcfg[5]);
+	QIXIS_WRITE(brdcfg[5],
+		    ((sw & ~(BRDCFG5_IMX_MASK)) | (BRDCFG5_IMX_DIU)));
+
+	/*Configure Display ouput port as HDMI*/
+	sw = QIXIS_READ(brdcfg[15]);
+	QIXIS_WRITE(brdcfg[15],
+		    ((sw & ~(BRDCFG15_LCDPD_MASK | BRDCFG15_DIUSEL_MASK))
+		      | (BRDCFG15_LCDPD_ENABLED | BRDCFG15_DIUSEL_HDMI)));
+
+	pixel_format = cpu_to_le32(AD_BYTE_F | (3 << AD_ALPHA_C_SHIFT) |
+		(0 << AD_BLUE_C_SHIFT) | (1 << AD_GREEN_C_SHIFT) |
+		(2 << AD_RED_C_SHIFT) | (8 << AD_COMP_3_SHIFT) |
+		(8 << AD_COMP_2_SHIFT) | (8 << AD_COMP_1_SHIFT) |
+		(8 << AD_COMP_0_SHIFT) | (3 << AD_PIXEL_S_SHIFT));
+
+	printf("DIU:   Switching to monitor @ %ux%u\n",  xres, yres);
+
+
+	return fsl_diu_init(xres, yres, pixel_format, 0);
+}
diff --git a/board/freescale/t1040qds/t1040qds.h b/board/freescale/t1040qds/t1040qds.h
index 79bdeda..5041f37 100644
--- a/board/freescale/t1040qds/t1040qds.h
+++ b/board/freescale/t1040qds/t1040qds.h
@@ -9,5 +9,6 @@
 
 void fdt_fixup_board_enet(void *blob);
 void pci_of_setup(void *blob, bd_t *bd);
+int select_i2c_ch_pca9547(u8 ch);
 
 #endif
diff --git a/board/freescale/t1040qds/t1040qds_qixis.h b/board/freescale/t1040qds/t1040qds_qixis.h
index 2ce8795..98d2d39 100644
--- a/board/freescale/t1040qds/t1040qds_qixis.h
+++ b/board/freescale/t1040qds/t1040qds_qixis.h
@@ -13,6 +13,18 @@
 #define BRDCFG4_EMISEL_MASK		0xE0
 #define BRDCFG4_EMISEL_SHIFT		5
 
+/* BRDCFG5[0:1] controls routing and use of I2C3 & I2C4 ports*/
+#define BRDCFG5_IMX_MASK		0xC0
+#define BRDCFG5_IMX_DIU			0x80
+
+/* BRDCFG15[3] controls LCD Panel Powerdown*/
+#define BRDCFG15_LCDPD_MASK		0x10
+#define BRDCFG15_LCDPD_ENABLED		0x00
+
+/* BRDCFG15[6:7] controls DIU MUX selction*/
+#define BRDCFG15_DIUSEL_MASK		0x03
+#define BRDCFG15_DIUSEL_HDMI		0x00
+
 /* SYSCLK */
 #define QIXIS_SYSCLK_66			0x0
 #define QIXIS_SYSCLK_83			0x1