drm: sti: add DVO output connector

Digital Video Out connector driver LCD panels.
Like HDMI and HDA it create bridge, encoder and connector
drm object.
Add binding description.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>

Documentation/devicetree/bindings/gpu/st,stih4xx.txt

@@ -83,6 +83,22 @@ sti-hda:
   - clock-names: names of the clocks listed in clocks property in the same
     order.
 
+sti-dvo:
+  Required properties:
+  must be a child of sti-tvout
+  - compatible: "st,stih<chip>-dvo"
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  - reg-names: names of the mapped memory regions listed in regs property in
+    the same order.
+  - clocks: from common clock binding: handle hardware IP needed clocks, the
+    number of clocks may depend of the SoC type.
+    See ../clocks/clock-bindings.txt for details.
+  - clock-names: names of the clocks listed in clocks property in the same
+    order.
+  - pinctrl-0: pin control handle
+  - pinctrl-name: names of the pin control to use
+  - sti,panel: phandle of the panel connected to the DVO output
+
 sti-hqvdp:
   must be a child of sti-display-subsystem
   Required properties:
@@ -198,6 +214,19 @@ Example:
 				clock-names	= "pix", "hddac";
 				clocks          = <&clockgen_c_vcc CLK_S_PIX_HD>, <&clockgen_c_vcc CLK_S_HDDAC>;
 			};
+
+			sti-dvo@8d00400 {
+				compatible	= "st,stih407-dvo";
+				reg		= <0x8d00400 0x200>;
+				reg-names	= "dvo-reg";
+				clock-names	= "dvo_pix", "dvo",
+						  "main_parent", "aux_parent";
+				clocks		= <&clk_s_d2_flexgen CLK_PIX_DVO>, <&clk_s_d2_flexgen CLK_DVO>,
+						  <&clk_s_d2_quadfs 0>, <&clk_s_d2_quadfs 1>;
+				pinctrl-names	= "default";
+				pinctrl-0	= <&pinctrl_dvo>;
+				sti,panel	= <&panel_dvo>;
+			};
 		};
 
 		sti-hqvdp@9c000000 {

drivers/gpu/drm/sti/Makefile

@@ -12,6 +12,9 @@ stihdmi-y := sti_hdmi.o \
 	sti_hdmi_tx3g0c55phy.o \
 	sti_hdmi_tx3g4c28phy.o \
 
+stidvo-y := sti_dvo.o \
+	sti_awg_utils.o
+
 obj-$(CONFIG_DRM_STI) = \
 	sti_vtg.o \
 	sti_vtac.o \
@@ -20,4 +23,5 @@ obj-$(CONFIG_DRM_STI) = \
 	sti_tvout.o \
 	sticompositor.o \
 	sti_hqvdp.o \
+	stidvo.o \
 	sti_drm_drv.o

drivers/gpu/drm/sti/sti_awg_utils.c

@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2014
+ * Author: Vincent Abriou <vincent.abriou@st.com> for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include "sti_awg_utils.h"
+
+#define AWG_OPCODE_OFFSET 10
+
+enum opcode {
+	SET,
+	RPTSET,
+	RPLSET,
+	SKIP,
+	STOP,
+	REPEAT,
+	REPLAY,
+	JUMP,
+	HOLD,
+};
+
+static int awg_generate_instr(enum opcode opcode,
+			      long int arg,
+			      long int mux_sel,
+			      long int data_en,
+			      struct awg_code_generation_params *fwparams)
+{
+	u32 instruction = 0;
+	u32 mux = (mux_sel << 8) & 0x1ff;
+	u32 data_enable = (data_en << 9) & 0x2ff;
+	long int arg_tmp = arg;
+
+	/* skip, repeat and replay arg should not exceed 1023.
+	 * If user wants to exceed this value, the instruction should be
+	 * duplicate and arg should be adjust for each duplicated instruction.
+	 */
+
+	while (arg_tmp > 0) {
+		arg = arg_tmp;
+		if (fwparams->instruction_offset >= AWG_MAX_INST) {
+			DRM_ERROR("too many number of instructions\n");
+			return -EINVAL;
+		}
+
+		switch (opcode) {
+		case SKIP:
+			/* leave 'arg' + 1 pixel elapsing without changing
+			 * output bus */
+			arg--; /* pixel adjustment */
+			arg_tmp--;
+
+			if (arg < 0) {
+				/* SKIP instruction not needed */
+				return 0;
+			}
+
+			if (arg == 0) {
+				/* SKIP 0 not permitted but we want to skip 1
+				 * pixel. So we transform SKIP into SET
+				 * instruction */
+				opcode = SET;
+				arg = (arg << 24) >> 24;
+				arg &= (0x0ff);
+				break;
+			}
+
+			mux = 0;
+			data_enable = 0;
+			arg = (arg << 22) >> 22;
+			arg &= (0x3ff);
+			break;
+		case REPEAT:
+		case REPLAY:
+			if (arg == 0) {
+				/* REPEAT or REPLAY instruction not needed */
+				return 0;
+			}
+
+			mux = 0;
+			data_enable = 0;
+			arg = (arg << 22) >> 22;
+			arg &= (0x3ff);
+			break;
+		case JUMP:
+			mux = 0;
+			data_enable = 0;
+			arg |= 0x40; /* for jump instruction 7th bit is 1 */
+			arg = (arg << 22) >> 22;
+			arg &= 0x3ff;
+			break;
+		case STOP:
+			arg = 0;
+			break;
+		case SET:
+		case RPTSET:
+		case RPLSET:
+		case HOLD:
+			arg = (arg << 24) >> 24;
+			arg &= (0x0ff);
+			break;
+		default:
+			DRM_ERROR("instruction %d does not exist\n", opcode);
+			return -EINVAL;
+		}
+
+		arg_tmp = arg_tmp - arg;
+
+		arg = ((arg + mux) + data_enable);
+
+		instruction = ((opcode) << AWG_OPCODE_OFFSET) | arg;
+		fwparams->ram_code[fwparams->instruction_offset] =
+			instruction & (0x3fff);
+		fwparams->instruction_offset++;
+	}
+	return 0;
+}
+
+int sti_awg_generate_code_data_enable_mode(
+		struct awg_code_generation_params *fwparams,
+		struct awg_timing *timing)
+{
+	long int val;
+	long int data_en;
+	int ret = 0;
+
+	if (timing->trailing_lines > 0) {
+		/* skip trailing lines */
+		val = timing->blanking_level;
+		data_en = 0;
+		ret |= awg_generate_instr(RPLSET, val, 0, data_en, fwparams);
+
+		val = timing->trailing_lines - 1;
+		data_en = 0;
+		ret |= awg_generate_instr(REPLAY, val, 0, data_en, fwparams);
+	}
+
+	if (timing->trailing_pixels > 0) {
+		/* skip trailing pixel */
+		val = timing->blanking_level;
+		data_en = 0;
+		ret |= awg_generate_instr(RPLSET, val, 0, data_en, fwparams);
+
+		val = timing->trailing_pixels - 1;
+		data_en = 0;
+		ret |= awg_generate_instr(SKIP, val, 0, data_en, fwparams);
+	}
+
+	/* set DE signal high */
+	val = timing->blanking_level;
+	data_en = 1;
+	ret |= awg_generate_instr((timing->trailing_pixels > 0) ? SET : RPLSET,
+			val, 0, data_en, fwparams);
+
+	if (timing->blanking_pixels > 0) {
+		/* skip the number of active pixel */
+		val = timing->active_pixels - 1;
+		data_en = 1;
+		ret |= awg_generate_instr(SKIP, val, 0, data_en, fwparams);
+
+		/* set DE signal low */
+		val = timing->blanking_level;
+		data_en = 0;
+		ret |= awg_generate_instr(SET, val, 0, data_en, fwparams);
+	}
+
+	/* replay the sequence as many active lines defined */
+	val = timing->active_lines - 1;
+	data_en = 0;
+	ret |= awg_generate_instr(REPLAY, val, 0, data_en, fwparams);
+
+	if (timing->blanking_lines > 0) {
+		/* skip blanking lines */
+		val = timing->blanking_level;
+		data_en = 0;
+		ret |= awg_generate_instr(RPLSET, val, 0, data_en, fwparams);
+
+		val = timing->blanking_lines - 1;
+		data_en = 0;
+		ret |= awg_generate_instr(REPLAY, val, 0, data_en, fwparams);
+	}
+
+	return ret;
+}

drivers/gpu/drm/sti/sti_awg_utils.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2014
+ * Author: Vincent Abriou <vincent.abriou@st.com> for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef _STI_AWG_UTILS_H_
+#define _STI_AWG_UTILS_H_
+
+#include <drm/drmP.h>
+
+#define AWG_MAX_INST 64
+
+struct awg_code_generation_params {
+	u32 *ram_code;
+	u8 instruction_offset;
+};
+
+struct awg_timing {
+	u32 total_lines;
+	u32 active_lines;
+	u32 blanking_lines;
+	u32 trailing_lines;
+	u32 total_pixels;
+	u32 active_pixels;
+	u32 blanking_pixels;
+	u32 trailing_pixels;
+	u32 blanking_level;
+};
+
+int sti_awg_generate_code_data_enable_mode(
+		struct awg_code_generation_params *fw_gen_params,
+		struct awg_timing *timing);
+#endif