drm/amdgpu: Vega20 SMU I2C HW engine controller.

Implement HW I2C enigne controller to be used by the RAS EEPROM
table manager. This is based on code from ATITOOLs.

v2:
Rename the file and all function prefixes to smu_v11_0_i2c

By Luben's observation always fill the TX fifo to full so
we don't have garbadge interpreted by the slave as valid data.

v3:
Remove preemption disable as the HW I2C controller will not
stop the clock on empty TX fifo and so it's not critical to
keep not empty queue.
Switch to fast mode 400 khz SCL clock for faster read and write.

v5:
Restore clock gating before releasing I2C bus and fix some
style comments.

v6:
squash in warning fix, fix includes (Alex)
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Luben Tuikov <Luben.Tuikov@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/Makefile

@@ -54,7 +54,7 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
 	amdgpu_gtt_mgr.o amdgpu_vram_mgr.o amdgpu_virt.o amdgpu_atomfirmware.o \
 	amdgpu_vf_error.o amdgpu_sched.o amdgpu_debugfs.o amdgpu_ids.o \
 	amdgpu_gmc.o amdgpu_xgmi.o amdgpu_csa.o amdgpu_ras.o amdgpu_vm_cpu.o \
-	amdgpu_vm_sdma.o amdgpu_pmu.o amdgpu_discovery.o amdgpu_ras_eeprom.o
+	amdgpu_vm_sdma.o amdgpu_pmu.o amdgpu_discovery.o amdgpu_ras_eeprom.o smu_v11_0_i2c.o
 
 amdgpu-$(CONFIG_PERF_EVENTS) += amdgpu_pmu.o
 

drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c

@@ -25,6 +25,7 @@
 #include "amdgpu.h"
 #include "amdgpu_ras.h"
 #include <linux/bits.h>
+#include "smu_v11_0_i2c.h"
 
 #define EEPROM_I2C_TARGET_ADDR 0xA0
 
@@ -118,7 +119,7 @@ int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control)
 
 	switch (adev->asic_type) {
 	case CHIP_VEGA20:
-	/*TODO Add MI-60 */
+		ret = smu_v11_0_i2c_eeprom_control_init(&control->eeprom_accessor);
 		break;
 
 	default:
@@ -170,7 +171,7 @@ void amdgpu_ras_eeprom_fini(struct amdgpu_ras_eeprom_control *control)
 
 	switch (adev->asic_type) {
 	case CHIP_VEGA20:
-		/*TODO Add MI-60 */
+		smu_v11_0_i2c_eeprom_control_fini(&control->eeprom_accessor);
 		break;
 
 	default:

drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.h

+/*
+ * Copyright 2019 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.
+ *
+ */
+
+#ifndef SMU_V11_I2C_CONTROL_H
+#define SMU_V11_I2C_CONTROL_H
+
+#include <linux/types.h>
+
+struct i2c_adapter;
+
+int smu_v11_0_i2c_eeprom_control_init(struct i2c_adapter *control);
+void smu_v11_0_i2c_eeprom_control_fini(struct i2c_adapter *control);
+
+#endif