drm/amd/display: Remove i2caux folder

[Why]
It is huge, unmaintainable, needlessly layered, and obsolete

[How]
Remove it.  All of it.  Also remove the i2caux struct in
dc_context and the code that created and destructed it

Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 0 insertions, 601 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/i2c_sw_engine.c b/drivers/gpu/drm/amd/display/dc/i2caux/i2c_sw_engine.c
deleted file mode 100644
index 8e19bb629394..000000000000
--- a/drivers/gpu/drm/amd/display/dc/i2caux/i2c_sw_engine.c
+++ /dev/null
@@ -1,601 +0,0 @@
-/*
- * Copyright 2012-15 Advanced Micro Devices, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- * OTHER DEALINGS IN THE SOFTWARE.
- *
- * Authors: AMD
- *
- */
-
-#include "dm_services.h"
-
-/*
- * Pre-requisites: headers required by header of this unit
- */
-#include "include/i2caux_interface.h"
-#include "engine.h"
-#include "i2c_engine.h"
-
-/*
- * Header of this unit
- */
-
-#include "i2c_sw_engine.h"
-
-/*
- * Post-requisites: headers required by this unit
- */
-
-/*
- * This unit
- */
-
-#define SCL false
-#define SDA true
-
-static inline bool read_bit_from_ddc(
-	struct ddc *ddc,
-	bool data_nor_clock)
-{
-	uint32_t value = 0;
-
-	if (data_nor_clock)
-		dal_gpio_get_value(ddc->pin_data, &value);
-	else
-		dal_gpio_get_value(ddc->pin_clock, &value);
-
-	return (value != 0);
-}
-
-static inline void write_bit_to_ddc(
-	struct ddc *ddc,
-	bool data_nor_clock,
-	bool bit)
-{
-	uint32_t value = bit ? 1 : 0;
-
-	if (data_nor_clock)
-		dal_gpio_set_value(ddc->pin_data, value);
-	else
-		dal_gpio_set_value(ddc->pin_clock, value);
-}
-
-static bool wait_for_scl_high(
-	struct dc_context *ctx,
-	struct ddc *ddc,
-	uint16_t clock_delay_div_4)
-{
-	uint32_t scl_retry = 0;
-	uint32_t scl_retry_max = I2C_SW_TIMEOUT_DELAY / clock_delay_div_4;
-
-	udelay(clock_delay_div_4);
-
-	/* 3 milliseconds delay
-	 * to wake up some displays from "low power" state.
-	 */
-
-	do {
-		if (read_bit_from_ddc(ddc, SCL))
-			return true;
-
-		udelay(clock_delay_div_4);
-
-		++scl_retry;
-	} while (scl_retry <= scl_retry_max);
-
-	return false;
-}
-
-static bool start_sync(
-	struct dc_context *ctx,
-	struct ddc *ddc_handle,
-	uint16_t clock_delay_div_4)
-{
-	uint32_t retry = 0;
-
-	/* The I2C communications start signal is:
-	 * the SDA going low from high, while the SCL is high. */
-
-	write_bit_to_ddc(ddc_handle, SCL, true);
-
-	udelay(clock_delay_div_4);
-
-	do {
-		write_bit_to_ddc(ddc_handle, SDA, true);
-
-		if (!read_bit_from_ddc(ddc_handle, SDA)) {
-			++retry;
-			continue;
-		}
-
-		udelay(clock_delay_div_4);
-
-		write_bit_to_ddc(ddc_handle, SCL, true);
-
-		if (!wait_for_scl_high(ctx, ddc_handle, clock_delay_div_4))
-			break;
-
-		write_bit_to_ddc(ddc_handle, SDA, false);
-
-		udelay(clock_delay_div_4);
-
-		write_bit_to_ddc(ddc_handle, SCL, false);
-
-		udelay(clock_delay_div_4);
-
-		return true;
-	} while (retry <= I2C_SW_RETRIES);
-
-	return false;
-}
-
-static bool stop_sync(
-	struct dc_context *ctx,
-	struct ddc *ddc_handle,
-	uint16_t clock_delay_div_4)
-{
-	uint32_t retry = 0;
-
-	/* The I2C communications stop signal is:
-	 * the SDA going high from low, while the SCL is high. */
-
-	write_bit_to_ddc(ddc_handle, SCL, false);
-
-	udelay(clock_delay_div_4);
-
-	write_bit_to_ddc(ddc_handle, SDA, false);
-
-	udelay(clock_delay_div_4);
-
-	write_bit_to_ddc(ddc_handle, SCL, true);
-
-	if (!wait_for_scl_high(ctx, ddc_handle, clock_delay_div_4))
-		return false;
-
-	write_bit_to_ddc(ddc_handle, SDA, true);
-
-	do {
-		udelay(clock_delay_div_4);
-
-		if (read_bit_from_ddc(ddc_handle, SDA))
-			return true;
-
-		++retry;
-	} while (retry <= 2);
-
-	return false;
-}
-
-static bool write_byte(
-	struct dc_context *ctx,
-	struct ddc *ddc_handle,
-	uint16_t clock_delay_div_4,
-	uint8_t byte)
-{
-	int32_t shift = 7;
-	bool ack;
-
-	/* bits are transmitted serially, starting from MSB */
-
-	do {
-		udelay(clock_delay_div_4);
-
-		write_bit_to_ddc(ddc_handle, SDA, (byte >> shift) & 1);
-
-		udelay(clock_delay_div_4);
-
-		write_bit_to_ddc(ddc_handle, SCL, true);
-
-		if (!wait_for_scl_high(ctx, ddc_handle, clock_delay_div_4))
-			return false;
-
-		write_bit_to_ddc(ddc_handle, SCL, false);
-
-		--shift;
-	} while (shift >= 0);
-
-	/* The display sends ACK by preventing the SDA from going high
-	 * after the SCL pulse we use to send our last data bit.
-	 * If the SDA goes high after that bit, it's a NACK */
-
-	udelay(clock_delay_div_4);
-
-	write_bit_to_ddc(ddc_handle, SDA, true);
-
-	udelay(clock_delay_div_4);
-
-	write_bit_to_ddc(ddc_handle, SCL, true);
-
-	if (!wait_for_scl_high(ctx, ddc_handle, clock_delay_div_4))
-		return false;
-
-	/* read ACK bit */
-
-	ack = !read_bit_from_ddc(ddc_handle, SDA);
-
-	udelay(clock_delay_div_4 << 1);
-
-	write_bit_to_ddc(ddc_handle, SCL, false);
-
-	udelay(clock_delay_div_4 << 1);
-
-	return ack;
-}
-
-static bool read_byte(
-	struct dc_context *ctx,
-	struct ddc *ddc_handle,
-	uint16_t clock_delay_div_4,
-	uint8_t *byte,
-	bool more)
-{
-	int32_t shift = 7;
-
-	uint8_t data = 0;
-
-	/* The data bits are read from MSB to LSB;
-	 * bit is read while SCL is high */
-
-	do {
-		write_bit_to_ddc(ddc_handle, SCL, true);
-
-		if (!wait_for_scl_high(ctx, ddc_handle, clock_delay_div_4))
-			return false;
-
-		if (read_bit_from_ddc(ddc_handle, SDA))
-			data |= (1 << shift);
-
-		write_bit_to_ddc(ddc_handle, SCL, false);
-
-		udelay(clock_delay_div_4 << 1);
-
-		--shift;
-	} while (shift >= 0);
-
-	/* read only whole byte */
-
-	*byte = data;
-
-	udelay(clock_delay_div_4);
-
-	/* send the acknowledge bit:
-	 * SDA low means ACK, SDA high means NACK */
-
-	write_bit_to_ddc(ddc_handle, SDA, !more);
-
-	udelay(clock_delay_div_4);
-
-	write_bit_to_ddc(ddc_handle, SCL, true);
-
-	if (!wait_for_scl_high(ctx, ddc_handle, clock_delay_div_4))
-		return false;
-
-	write_bit_to_ddc(ddc_handle, SCL, false);
-
-	udelay(clock_delay_div_4);
-
-	write_bit_to_ddc(ddc_handle, SDA, true);
-
-	udelay(clock_delay_div_4);
-
-	return true;
-}
-
-static bool i2c_write(
-	struct dc_context *ctx,
-	struct ddc *ddc_handle,
-	uint16_t clock_delay_div_4,
-	uint8_t address,
-	uint32_t length,
-	const uint8_t *data)
-{
-	uint32_t i = 0;
-
-	if (!write_byte(ctx, ddc_handle, clock_delay_div_4, address))
-		return false;
-
-	while (i < length) {
-		if (!write_byte(ctx, ddc_handle, clock_delay_div_4, data[i]))
-			return false;
-		++i;
-	}
-
-	return true;
-}
-
-static bool i2c_read(
-	struct dc_context *ctx,
-	struct ddc *ddc_handle,
-	uint16_t clock_delay_div_4,
-	uint8_t address,
-	uint32_t length,
-	uint8_t *data)
-{
-	uint32_t i = 0;
-
-	if (!write_byte(ctx, ddc_handle, clock_delay_div_4, address))
-		return false;
-
-	while (i < length) {
-		if (!read_byte(ctx, ddc_handle, clock_delay_div_4, data + i,
-			i < length - 1))
-			return false;
-		++i;
-	}
-
-	return true;
-}
-
-/*
- * @brief
- * Cast 'struct i2c_engine *'
- * to 'struct i2c_sw_engine *'
- */
-#define FROM_I2C_ENGINE(ptr) \
-	container_of((ptr), struct i2c_sw_engine, base)
-
-/*
- * @brief
- * Cast 'struct engine *'
- * to 'struct i2c_sw_engine *'
- */
-#define FROM_ENGINE(ptr) \
-	FROM_I2C_ENGINE(container_of((ptr), struct i2c_engine, base))
-
-enum i2caux_engine_type dal_i2c_sw_engine_get_engine_type(
-	const struct engine *engine)
-{
-	return I2CAUX_ENGINE_TYPE_I2C_SW;
-}
-
-bool dal_i2c_sw_engine_submit_request(
-	struct engine *engine,
-	struct i2caux_transaction_request *i2caux_request,
-	bool middle_of_transaction)
-{
-	struct i2c_sw_engine *sw_engine = FROM_ENGINE(engine);
-
-	struct i2c_engine *base = &sw_engine->base;
-
-	struct i2c_request_transaction_data request;
-	bool operation_succeeded = false;
-
-	if (i2caux_request->operation == I2CAUX_TRANSACTION_READ)
-		request.action = middle_of_transaction ?
-			I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT :
-			I2CAUX_TRANSACTION_ACTION_I2C_READ;
-	else if (i2caux_request->operation == I2CAUX_TRANSACTION_WRITE)
-		request.action = middle_of_transaction ?
-			I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT :
-			I2CAUX_TRANSACTION_ACTION_I2C_WRITE;
-	else {
-		i2caux_request->status =
-			I2CAUX_TRANSACTION_STATUS_FAILED_INVALID_OPERATION;
-		/* in DAL2, there was no "return false" */
-		return false;
-	}
-
-	request.address = (uint8_t)i2caux_request->payload.address;
-	request.length = i2caux_request->payload.length;
-	request.data = i2caux_request->payload.data;
-
-	base->funcs->submit_channel_request(base, &request);
-
-	if ((request.status == I2C_CHANNEL_OPERATION_ENGINE_BUSY) ||
-		(request.status == I2C_CHANNEL_OPERATION_FAILED))
-		i2caux_request->status =
-			I2CAUX_TRANSACTION_STATUS_FAILED_CHANNEL_BUSY;
-	else {
-		enum i2c_channel_operation_result operation_result;
-
-		do {
-			operation_result =
-				base->funcs->get_channel_status(base, NULL);
-
-			switch (operation_result) {
-			case I2C_CHANNEL_OPERATION_SUCCEEDED:
-				i2caux_request->status =
-					I2CAUX_TRANSACTION_STATUS_SUCCEEDED;
-				operation_succeeded = true;
-			break;
-			case I2C_CHANNEL_OPERATION_NO_RESPONSE:
-				i2caux_request->status =
-					I2CAUX_TRANSACTION_STATUS_FAILED_NACK;
-			break;
-			case I2C_CHANNEL_OPERATION_TIMEOUT:
-				i2caux_request->status =
-				I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT;
-			break;
-			case I2C_CHANNEL_OPERATION_FAILED:
-				i2caux_request->status =
-				I2CAUX_TRANSACTION_STATUS_FAILED_INCOMPLETE;
-			break;
-			default:
-				i2caux_request->status =
-				I2CAUX_TRANSACTION_STATUS_FAILED_OPERATION;
-			break;
-			}
-		} while (operation_result == I2C_CHANNEL_OPERATION_ENGINE_BUSY);
-	}
-
-	return operation_succeeded;
-}
-
-uint32_t dal_i2c_sw_engine_get_speed(
-	const struct i2c_engine *engine)
-{
-	return FROM_I2C_ENGINE(engine)->speed;
-}
-
-void dal_i2c_sw_engine_set_speed(
-	struct i2c_engine *engine,
-	uint32_t speed)
-{
-	struct i2c_sw_engine *sw_engine = FROM_I2C_ENGINE(engine);
-
-	ASSERT(speed);
-
-	sw_engine->speed = speed ? speed : I2CAUX_DEFAULT_I2C_SW_SPEED;
-
-	sw_engine->clock_delay = 1000 / sw_engine->speed;
-
-	if (sw_engine->clock_delay < 12)
-		sw_engine->clock_delay = 12;
-}
-
-bool dal_i2caux_i2c_sw_engine_acquire_engine(
-	struct i2c_engine *engine,
-	struct ddc *ddc)
-{
-	enum gpio_result result;
-
-	result = dal_ddc_open(ddc, GPIO_MODE_FAST_OUTPUT,
-		GPIO_DDC_CONFIG_TYPE_MODE_I2C);
-
-	if (result != GPIO_RESULT_OK)
-		return false;
-
-	engine->base.ddc = ddc;
-
-	return true;
-}
-
-void dal_i2c_sw_engine_submit_channel_request(
-	struct i2c_engine *engine,
-	struct i2c_request_transaction_data *req)
-{
-	struct i2c_sw_engine *sw_engine = FROM_I2C_ENGINE(engine);
-
-	struct ddc *ddc = engine->base.ddc;
-	uint16_t clock_delay_div_4 = sw_engine->clock_delay >> 2;
-
-	/* send sync (start / repeated start) */
-
-	bool result = start_sync(engine->base.ctx, ddc, clock_delay_div_4);
-
-	/* process payload */
-
-	if (result) {
-		switch (req->action) {
-		case I2CAUX_TRANSACTION_ACTION_I2C_WRITE:
-		case I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT:
-			result = i2c_write(engine->base.ctx, ddc, clock_delay_div_4,
-				req->address, req->length, req->data);
-		break;
-		case I2CAUX_TRANSACTION_ACTION_I2C_READ:
-		case I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT:
-			result = i2c_read(engine->base.ctx, ddc, clock_delay_div_4,
-				req->address, req->length, req->data);
-		break;
-		default:
-			result = false;
-		break;
-		}
-	}
-
-	/* send stop if not 'mot' or operation failed */
-
-	if (!result ||
-		(req->action == I2CAUX_TRANSACTION_ACTION_I2C_WRITE) ||
-		(req->action == I2CAUX_TRANSACTION_ACTION_I2C_READ))
-		if (!stop_sync(engine->base.ctx, ddc, clock_delay_div_4))
-			result = false;
-
-	req->status = result ?
-		I2C_CHANNEL_OPERATION_SUCCEEDED :
-		I2C_CHANNEL_OPERATION_FAILED;
-}
-
-enum i2c_channel_operation_result dal_i2c_sw_engine_get_channel_status(
-	struct i2c_engine *engine,
-	uint8_t *returned_bytes)
-{
-	/* No arbitration with VBIOS is performed since DCE 6.0 */
-	return I2C_CHANNEL_OPERATION_SUCCEEDED;
-}
-
-void dal_i2c_sw_engine_destruct(
-	struct i2c_sw_engine *engine)
-{
-	dal_i2c_engine_destruct(&engine->base);
-}
-
-static void destroy(
-	struct i2c_engine **ptr)
-{
-	dal_i2c_sw_engine_destruct(FROM_I2C_ENGINE(*ptr));
-
-	kfree(*ptr);
-	*ptr = NULL;
-}
-
-static const struct i2c_engine_funcs i2c_engine_funcs = {
-	.acquire_engine = dal_i2caux_i2c_sw_engine_acquire_engine,
-	.destroy = destroy,
-	.get_speed = dal_i2c_sw_engine_get_speed,
-	.set_speed = dal_i2c_sw_engine_set_speed,
-	.setup_engine = dal_i2c_engine_setup_i2c_engine,
-	.submit_channel_request = dal_i2c_sw_engine_submit_channel_request,
-	.process_channel_reply = dal_i2c_engine_process_channel_reply,
-	.get_channel_status = dal_i2c_sw_engine_get_channel_status,
-};
-
-static void release_engine(
-	struct engine *engine)
-{
-
-}
-
-static const struct engine_funcs engine_funcs = {
-	.release_engine = release_engine,
-	.get_engine_type = dal_i2c_sw_engine_get_engine_type,
-	.acquire = dal_i2c_engine_acquire,
-	.submit_request = dal_i2c_sw_engine_submit_request,
-};
-
-void dal_i2c_sw_engine_construct(
-	struct i2c_sw_engine *engine,
-	const struct i2c_sw_engine_create_arg *arg)
-{
-	dal_i2c_engine_construct(&engine->base, arg->ctx);
-	dal_i2c_sw_engine_set_speed(&engine->base, arg->default_speed);
-	engine->base.funcs = &i2c_engine_funcs;
-	engine->base.base.funcs = &engine_funcs;
-}
-
-struct i2c_engine *dal_i2c_sw_engine_create(
-	const struct i2c_sw_engine_create_arg *arg)
-{
-	struct i2c_sw_engine *engine;
-
-	if (!arg) {
-		BREAK_TO_DEBUGGER();
-		return NULL;
-	}
-
-	engine = kzalloc(sizeof(struct i2c_sw_engine), GFP_KERNEL);
-
-	if (!engine) {
-		BREAK_TO_DEBUGGER();
-		return NULL;
-	}
-
-	dal_i2c_sw_engine_construct(engine, arg);
-	return &engine->base;
-}