Open source GPL/LGPL release

drivers/gpu/nvgpu/os/linux/debug_volt.c

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2019-2020, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/debugfs.h>
+#include "os_linux.h"
+
+#include <nvgpu/pmu/volt.h>
+
+static int get_curr_voltage(void *data, u64 *val)
+{
+	struct gk20a *g = (struct gk20a *)data;
+	u32 readval;
+	int err;
+
+	err = nvgpu_pmu_volt_get_curr_volt_ps35(g, &readval);
+	if (!err)
+		*val = readval;
+
+	return err;
+}
+DEFINE_SIMPLE_ATTRIBUTE(curr_volt_ctrl_fops, get_curr_voltage, NULL, "%llu\n");
+
+static int get_min_voltage(void *data, u64 *val)
+{
+	struct gk20a *g = (struct gk20a *)data;
+	u32 minval, maxval;
+	int err;
+
+	err = nvgpu_pmu_volt_get_vmin_vmax_ps35(g, &minval, &maxval);
+	if (!err)
+		*val = minval;
+
+	return err;
+}
+DEFINE_SIMPLE_ATTRIBUTE(min_volt_ctrl_fops, get_min_voltage, NULL, "%llu\n");
+
+static int get_max_voltage(void *data, u64 *val)
+{
+	struct gk20a *g = (struct gk20a *)data;
+	u32 minval, maxval;
+	int err;
+
+	err = nvgpu_pmu_volt_get_vmin_vmax_ps35(g, &minval, &maxval);
+	if (!err)
+		*val = maxval;
+
+	return err;
+}
+DEFINE_SIMPLE_ATTRIBUTE(max_volt_ctrl_fops, get_max_voltage, NULL, "%llu\n");
+
+int nvgpu_volt_init_debugfs(struct gk20a *g)
+{
+	struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+	struct dentry *dbgentry, *volt_root;
+
+	volt_root = debugfs_create_dir("volt", l->debugfs);
+
+	dbgentry = debugfs_create_file(
+		"current_voltage", S_IRUGO, volt_root, g, &curr_volt_ctrl_fops);
+	if (!dbgentry) {
+		pr_err("%s: Failed to make debugfs node\n", __func__);
+		return -ENOMEM;
+	}
+
+	dbgentry = debugfs_create_file("minimum_voltage",
+			S_IRUGO, volt_root, g, &min_volt_ctrl_fops);
+	if (!dbgentry) {
+		pr_err("%s: Failed to make debugfs node\n", __func__);
+		return -ENOMEM;
+	}
+
+	dbgentry = debugfs_create_file("maximum_voltage",
+			S_IRUGO, volt_root, g, &max_volt_ctrl_fops);
+	if (!dbgentry) {
+		pr_err("%s: Failed to make debugfs node\n", __func__);
+		return -ENOMEM;
+	}
+
+	return 0;
+}