[aml-gpu][fidl] Add FIDL versions of GPU ioctls

This ioctl is only used to set the clock frequency source on mali on
amlogic. I'll remove the ioctl version once thermd in garnet is
converted.

Test: vkcube on vim2
ZX-2829

Change-Id: I0121c0fdb4a84712cc82ac23ab9dac810fdb3464

system/dev/gpu/aml-gpu/aml-gpu.c

@@ -14,6 +14,7 @@
 #include <ddk/protocol/platform/bus.h>
 #include <ddk/protocol/platform/device.h>
 #include <ddk/protocol/platform-device-lib.h>
+#include <fuchsia/gpu/clock/c/fidl.h>
 #include <hw/reg.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -170,11 +171,31 @@ static zx_status_t aml_gpu_ioctl(void* ctx, uint32_t op,
     }
 }
 
+static zx_status_t aml_gpu_SetFrequencySource(void* ctx, uint32_t clk_source, fidl_txn_t* txn) {
+    aml_gpu_t* gpu = ctx;
+    if (clk_source >= MAX_GPU_CLK_FREQ) {
+        GPU_ERROR("Invalid clock freq source index\n");
+        return fuchsia_gpu_clock_ClockSetFrequencySource_reply(txn, ZX_ERR_NOT_SUPPORTED);
+    }
+    aml_gpu_set_clk_freq_source(gpu, clk_source);
+    return fuchsia_gpu_clock_ClockSetFrequencySource_reply(txn, ZX_OK);
+}
+
+
+static fuchsia_gpu_clock_Clock_ops_t fidl_ops = {
+    .SetFrequencySource = aml_gpu_SetFrequencySource
+};
+
+static zx_status_t aml_gpu_message(void* ctx, fidl_msg_t* msg, fidl_txn_t* txn) {
+    return fuchsia_gpu_clock_Clock_dispatch(ctx, txn, msg, &fidl_ops);
+}
+
 static zx_protocol_device_t aml_gpu_protocol = {
     .version = DEVICE_OPS_VERSION,
     .release = aml_gpu_release,
     .get_protocol = aml_gpu_get_protocol,
     .ioctl = aml_gpu_ioctl,
+    .message = aml_gpu_message,
 };
 
 static zx_status_t aml_gpu_bind(void* ctx, zx_device_t* parent) {

system/dev/gpu/aml-gpu/rules.mk

@@ -12,7 +12,7 @@ MODULE_SRCS += \
     $(LOCAL_DIR)/aml-gpu.c \
     $(LOCAL_DIR)/aml-s905d2g.c \
 
-MODULE_STATIC_LIBS := system/ulib/ddk system/ulib/sync system/dev/lib/amlogic
+MODULE_STATIC_LIBS := system/ulib/ddk system/ulib/sync system/dev/lib/amlogic system/ulib/fidl
 
 MODULE_LIBS := system/ulib/driver system/ulib/c system/ulib/zircon
 
@@ -23,6 +23,9 @@ MODULE_BANJO_LIBS := \
     system/banjo/ddk-protocol-platform-device \
     system/banjo/ddk-protocol-scpi \
 
+MODULE_FIDL_LIBS := \
+    system/fidl/fuchsia-gpu-clock \
+
 MODULE_HEADER_DEPS := \
     system/dev/lib/amlogic
 

system/fidl/fuchsia-gpu-clock/clock.fidl

+// Copyright 2018 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+library fuchsia.gpu.clock;
+
+using zx;
+
+[Layout = "Simple"]
+interface Clock {
+    1: SetFrequencySource(uint32 source) -> (zx.status s);
+};

system/fidl/fuchsia-gpu-clock/rules.mk

+# Copyright 2018 The Fuchsia Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+MODULE_TYPE := fidl
+MODULE_PACKAGE := fidl
+
+MODULE_FIDL_LIBRARY := fuchsia.gpu.clock
+MODULE_SRCS += $(LOCAL_DIR)/clock.fidl
+
+include make/module.mk