1 files changed, 284 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/i2c_generic_hw_engine.c b/drivers/gpu/drm/amd/display/dc/i2caux/i2c_generic_hw_engine.c
new file mode 100644
index 000000000000..5a4295e0fae5
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/i2caux/i2c_generic_hw_engine.c
@@ -0,0 +1,284 @@
+/*
+ * 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"
+#include "i2c_hw_engine.h"
+
+/*
+ * Header of this unit
+ */
+
+#include "i2c_generic_hw_engine.h"
+
+/*
+ * Post-requisites: headers required by this unit
+ */
+
+/*
+ * This unit
+ */
+
+/*
+ * @brief
+ * Cast 'struct i2c_hw_engine *'
+ * to 'struct i2c_generic_hw_engine *'
+ */
+#define FROM_I2C_HW_ENGINE(ptr) \
+	container_of((ptr), struct i2c_generic_hw_engine, base)
+
+/*
+ * @brief
+ * Cast 'struct i2c_engine *'
+ * to 'struct i2c_generic_hw_engine *'
+ */
+#define FROM_I2C_ENGINE(ptr) \
+	FROM_I2C_HW_ENGINE(container_of((ptr), struct i2c_hw_engine, base))
+
+/*
+ * @brief
+ * Cast 'struct engine *'
+ * to 'struct i2c_generic_hw_engine *'
+ */
+#define FROM_ENGINE(ptr) \
+	FROM_I2C_ENGINE(container_of((ptr), struct i2c_engine, base))
+
+enum i2caux_engine_type dal_i2c_generic_hw_engine_get_engine_type(
+	const struct engine *engine)
+{
+	return I2CAUX_ENGINE_TYPE_I2C_GENERIC_HW;
+}
+
+/*
+ * @brief
+ * Single transaction handling.
+ * Since transaction may be bigger than HW buffer size,
+ * it divides transaction to sub-transactions
+ * and uses batch transaction feature of the engine.
+ */
+bool dal_i2c_generic_hw_engine_submit_request(
+	struct engine *engine,
+	struct i2caux_transaction_request *i2caux_request,
+	bool middle_of_transaction)
+{
+	struct i2c_generic_hw_engine *hw_engine = FROM_ENGINE(engine);
+
+	struct i2c_hw_engine *base = &hw_engine->base;
+
+	uint32_t max_payload_size =
+		base->funcs->get_hw_buffer_available_size(base);
+
+	bool initial_stop_bit = !middle_of_transaction;
+
+	struct i2c_generic_transaction_attributes attributes;
+
+	enum i2c_channel_operation_result operation_result =
+		I2C_CHANNEL_OPERATION_FAILED;
+
+	bool result = false;
+
+	/* setup transaction initial properties */
+
+	uint8_t address = i2caux_request->payload.address;
+	uint8_t *current_payload = i2caux_request->payload.data;
+	uint32_t remaining_payload_size = i2caux_request->payload.length;
+
+	bool first_iteration = true;
+
+	if (i2caux_request->operation == I2CAUX_TRANSACTION_READ)
+		attributes.action = I2CAUX_TRANSACTION_ACTION_I2C_READ;
+	else if (i2caux_request->operation == I2CAUX_TRANSACTION_WRITE)
+		attributes.action = I2CAUX_TRANSACTION_ACTION_I2C_WRITE;
+	else {
+		i2caux_request->status =
+			I2CAUX_TRANSACTION_STATUS_FAILED_INVALID_OPERATION;
+		return false;
+	}
+
+	/* Do batch transaction.
+	 * Divide read/write data into payloads which fit HW buffer size.
+	 * 1. Single transaction:
+	 *    start_bit = 1, stop_bit depends on session state, ack_on_read = 0;
+	 * 2. Start of batch transaction:
+	 *    start_bit = 1, stop_bit = 0, ack_on_read = 1;
+	 * 3. Middle of batch transaction:
+	 *    start_bit = 0, stop_bit = 0, ack_on_read = 1;
+	 * 4. End of batch transaction:
+	 *    start_bit = 0, stop_bit depends on session state, ack_on_read = 0.
+	 * Session stop bit is set if 'middle_of_transaction' = 0. */
+
+	while (remaining_payload_size) {
+		uint32_t current_transaction_size;
+		uint32_t current_payload_size;
+
+		bool last_iteration;
+		bool stop_bit;
+
+		/* Calculate current transaction size and payload size.
+		 * Transaction size = total number of bytes in transaction,
+		 * including slave's address;
+		 * Payload size = number of data bytes in transaction. */
+
+		if (first_iteration) {
+			/* In the first sub-transaction we send slave's address
+			 * thus we need to reserve one byte for it */
+			current_transaction_size =
+			(remaining_payload_size > max_payload_size - 1) ?
+				max_payload_size :
+				remaining_payload_size + 1;
+
+			current_payload_size = current_transaction_size - 1;
+		} else {
+			/* Second and further sub-transactions will have
+			 * entire buffer reserved for data */
+			current_transaction_size =
+				(remaining_payload_size > max_payload_size) ?
+				max_payload_size :
+				remaining_payload_size;
+
+			current_payload_size = current_transaction_size;
+		}
+
+		last_iteration =
+			(remaining_payload_size == current_payload_size);
+
+		stop_bit = last_iteration ? initial_stop_bit : false;
+
+		/* write slave device address */
+
+		if (first_iteration)
+			hw_engine->funcs->write_address(hw_engine, address);
+
+		/* write current portion of data, if requested */
+
+		if (i2caux_request->operation == I2CAUX_TRANSACTION_WRITE)
+			hw_engine->funcs->write_data(
+				hw_engine,
+				current_payload,
+				current_payload_size);
+
+		/* execute transaction */
+
+		attributes.start_bit = first_iteration;
+		attributes.stop_bit = stop_bit;
+		attributes.last_read = last_iteration;
+		attributes.transaction_size = current_transaction_size;
+
+		hw_engine->funcs->execute_transaction(hw_engine, &attributes);
+
+		/* wait until transaction is processed; if it fails - quit */
+
+		operation_result = base->funcs->wait_on_operation_result(
+			base,
+			base->funcs->get_transaction_timeout(
+				base, current_transaction_size),
+			I2C_CHANNEL_OPERATION_ENGINE_BUSY);
+
+		if (operation_result != I2C_CHANNEL_OPERATION_SUCCEEDED)
+			break;
+
+		/* read current portion of data, if requested */
+
+		/* the read offset should be 1 for first sub-transaction,
+		 * and 0 for any next one */
+
+		if (i2caux_request->operation == I2CAUX_TRANSACTION_READ)
+			hw_engine->funcs->read_data(hw_engine, current_payload,
+				current_payload_size, first_iteration ? 1 : 0);
+
+		/* update loop variables */
+
+		first_iteration = false;
+		current_payload += current_payload_size;
+		remaining_payload_size -= current_payload_size;
+	}
+
+	/* update transaction status */
+
+	switch (operation_result) {
+	case I2C_CHANNEL_OPERATION_SUCCEEDED:
+		i2caux_request->status =
+			I2CAUX_TRANSACTION_STATUS_SUCCEEDED;
+		result = 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;
+	}
+
+	return result;
+}
+
+/*
+ * @brief
+ * Returns number of microseconds to wait until timeout to be considered
+ */
+uint32_t dal_i2c_generic_hw_engine_get_transaction_timeout(
+	const struct i2c_hw_engine *engine,
+	uint32_t length)
+{
+	const struct i2c_engine *base = &engine->base;
+
+	uint32_t speed = base->funcs->get_speed(base);
+
+	if (!speed)
+		return 0;
+
+	/* total timeout = period_timeout * (start + data bits count + stop) */
+
+	return ((1000 * TRANSACTION_TIMEOUT_IN_I2C_CLOCKS) / speed) *
+		(1 + (length << 3) + 1);
+}
+
+void dal_i2c_generic_hw_engine_construct(
+	struct i2c_generic_hw_engine *engine,
+	struct dc_context *ctx)
+{
+	dal_i2c_hw_engine_construct(&engine->base, ctx);
+}
+
+void dal_i2c_generic_hw_engine_destruct(
+	struct i2c_generic_hw_engine *engine)
+{
+	dal_i2c_hw_engine_destruct(&engine->base);
+}