drm/radeon/kms: add dpm support for trinity asics

This adds dpm support for trinity asics.  This includes:
- clockgating
- powergating
- dynamic engine clock scaling
- dynamic voltage scaling

set radeon.dpm=1 to enable it.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/trinity_smc.c

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2012 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.
+ *
+ */
+
+#include "drmP.h"
+#include "radeon.h"
+#include "trinityd.h"
+#include "trinity_dpm.h"
+#include "ppsmc.h"
+
+struct trinity_ps *trinity_get_ps(struct radeon_ps *rps);
+struct trinity_power_info *trinity_get_pi(struct radeon_device *rdev);
+
+static int trinity_notify_message_to_smu(struct radeon_device *rdev, u32 id)
+{
+	int i;
+	u32 v = 0;
+
+	WREG32(SMC_MESSAGE_0, id);
+	for (i = 0; i < rdev->usec_timeout; i++) {
+		if (RREG32(SMC_RESP_0) != 0)
+			break;
+		udelay(1);
+	}
+	v = RREG32(SMC_RESP_0);
+
+	if (v != 1) {
+		if (v == 0xFF) {
+			DRM_ERROR("SMC failed to handle the message!\n");
+			return -EINVAL;
+		} else if (v == 0xFE) {
+			DRM_ERROR("Unknown SMC message!\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+int trinity_dpm_config(struct radeon_device *rdev, bool enable)
+{
+	if (enable)
+		WREG32_SMC(SMU_SCRATCH0, 1);
+	else
+		WREG32_SMC(SMU_SCRATCH0, 0);
+
+	return trinity_notify_message_to_smu(rdev, PPSMC_MSG_DPM_Config);
+}
+
+int trinity_dpm_force_state(struct radeon_device *rdev, u32 n)
+{
+	WREG32_SMC(SMU_SCRATCH0, n);
+
+	return trinity_notify_message_to_smu(rdev, PPSMC_MSG_DPM_ForceState);
+}
+
+int trinity_dpm_no_forced_level(struct radeon_device *rdev)
+{
+	return trinity_notify_message_to_smu(rdev, PPSMC_MSG_NoForcedLevel);
+}
+
+int trinity_dce_enable_voltage_adjustment(struct radeon_device *rdev,
+					  bool enable)
+{
+	if (enable)
+		return trinity_notify_message_to_smu(rdev, PPSMC_MSG_DCE_AllowVoltageAdjustment);
+	else
+		return trinity_notify_message_to_smu(rdev, PPSMC_MSG_DCE_RemoveVoltageAdjustment);
+}
+
+int trinity_gfx_dynamic_mgpg_config(struct radeon_device *rdev)
+{
+	return trinity_notify_message_to_smu(rdev, PPSMC_MSG_PG_SIMD_Config);
+}
+
+void trinity_acquire_mutex(struct radeon_device *rdev)
+{
+	int i;
+
+	WREG32(SMC_INT_REQ, 1);
+	for (i = 0; i < rdev->usec_timeout; i++) {
+		if ((RREG32(SMC_INT_REQ) & 0xffff) == 1)
+			break;
+		udelay(1);
+	}
+}
+
+void trinity_release_mutex(struct radeon_device *rdev)
+{
+	WREG32(SMC_INT_REQ, 0);
+}