gpu: nvgpu: Refactor Clk, Volt sub-unit

As a part of refactoring, we need to move the volt unit from perf to pmu
as it belongs there and also move the arbitor specific functions under
CLK_ARB as they will be removed from safety build.
This patch does the following
*Move volt struct from perf to pmu
*Move volt setup from pmu_pstate to volt
*Move clk freq related functions into CLK_ARB

NVGPU-4491
NVGPU-4492

Change-Id: I7180cd12bbf91cc4d2e79b6e2d71c16e494c8ff0
Signed-off-by: Abdul Salam <absalam@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2268215
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/pmu/volt/volt.c

@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * 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 AUTHORS OR COPYRIGHT HOLDERS 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 <nvgpu/pmu/volt.h>
+#include <nvgpu/gk20a.h>
+
+#include "volt_rail.h"
+#include "volt_dev.h"
+#include "volt_policy.h"
+#include "volt_pmu.h"
+
+int nvgpu_pmu_volt_sw_setup(struct gk20a *g)
+{
+	int err;
+	nvgpu_log_fn(g, " ");
+
+	err = nvgpu_volt_rail_sw_setup(g);
+	if (err != 0) {
+		return err;
+	}
+
+	err = nvgpu_volt_dev_sw_setup(g);
+	if (err != 0) {
+		return err;
+	}
+
+	err = nvgpu_volt_policy_sw_setup(g);
+	if (err != 0) {
+		return err;
+	}
+
+	return 0;
+}
+
+int nvgpu_pmu_volt_init(struct gk20a *g)
+{
+	int err = 0;
+
+	nvgpu_log_fn(g, " ");
+
+	/* If already allocated, do not re-allocate */
+	if (g->pmu->volt != NULL) {
+		return 0;
+	}
+
+	g->pmu->volt = (struct nvgpu_pmu_volt *) nvgpu_kzalloc(g,
+			sizeof(struct nvgpu_pmu_volt));
+	if (g->pmu->volt == NULL) {
+		err = -ENOMEM;
+		return err;
+	}
+
+	return err;
+}
+
+void nvgpu_pmu_volt_deinit(struct gk20a *g)
+{
+	if ((g->pmu != NULL) && (g->pmu->volt != NULL)) {
+		nvgpu_kfree(g, g->pmu->volt);
+		g->pmu->volt = NULL;
+	}
+}
+
+int nvgpu_pmu_volt_pmu_setup(struct gk20a *g)
+{
+	int err;
+	nvgpu_log_fn(g, " ");
+
+	err = nvgpu_volt_rail_pmu_setup(g);
+	if (err != 0) {
+		return err;
+	}
+
+	err = nvgpu_volt_dev_pmu_setup(g);
+	if (err != 0) {
+		return err;
+	}
+
+	err = nvgpu_volt_policy_pmu_setup(g);
+	if (err != 0) {
+		return err;
+	}
+
+	err = nvgpu_volt_send_load_cmd_to_pmu(g);
+	if (err != 0) {
+		nvgpu_err(g,
+			"Failed to send VOLT LOAD CMD to PMU: status = 0x%08x.",
+			err);
+		return err;
+	}
+
+	return 0;
+}