1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/gpu/drm/sti/sti_awg_utils.c b/drivers/gpu/drm/sti/sti_awg_utils.c
new file mode 100644
index 000000000000..9fde3ee8b1a5
--- /dev/null
+++ b/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;
+}