gpu: nvgpu: gp10x: Add debugfs entry for temperature reading

Added current temperature reading support for gp10x.

JIRA DNVGPU-48

Change-Id: I45959da28bbd207dcf899a9eb37900c69895cfc1
Signed-off-by: Lakshmanan M <lm@nvidia.com>
Reviewed-on: http://git-master/r/1213717
(cherry picked from commit 805245889d1df8aefce277cff9ea31ea5fb4706b)
Reviewed-on: http://git-master/r/1234092
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gp106/therm_gp106.c b/drivers/gpu/nvgpu/gp106/therm_gp106.c
new file mode 100644
index 00000000..153e953d
--- /dev/null
+++ b/drivers/gpu/nvgpu/gp106/therm_gp106.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2016, 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.
+ */
+
+#include "therm_gp106.h"
+#include <linux/debugfs.h>
+#include "hw_therm_gp106.h"
+
+#ifdef CONFIG_DEBUG_FS
+static int therm_get_internal_sensor_curr_temp(void *data, u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int err = 0;
+        u32 readval;
+
+        readval = gk20a_readl(g, therm_temp_sensor_tsense_r());
+
+        if (!(therm_temp_sensor_tsense_state_v(readval) &
+                therm_temp_sensor_tsense_state_valid_v())) {
+                gk20a_err(dev_from_gk20a(g),
+                        "Attempt to read temperature while sensor is OFF!\n");
+                err = -EINVAL;
+        } else if (therm_temp_sensor_tsense_state_v(readval) &
+                therm_temp_sensor_tsense_state_shadow_v()) {
+                gk20a_err(dev_from_gk20a(g),
+                        "Reading temperature from SHADOWed sensor!\n");
+        }
+
+        // Convert from F9.5 -> F27.5 -> F24.8.
+        readval &= therm_temp_sensor_tsense_fixed_point_m();
+
+        *val = readval;
+
+        return err;
+}
+DEFINE_SIMPLE_ATTRIBUTE(therm_ctrl_fops, therm_get_internal_sensor_curr_temp, NULL, "%llu\n");
+
+static void gp106_therm_debugfs_init(struct gk20a *g) {
+        struct gk20a_platform *platform = dev_get_drvdata(g->dev);
+        struct dentry *dbgentry;
+
+        dbgentry = debugfs_create_file(
+                "temp", S_IRUGO, platform->debugfs, g, &therm_ctrl_fops);
+        if (!dbgentry)
+                gk20a_err(dev_from_gk20a(g), "debugfs entry create failed for therm_curr_temp");
+}
+#endif
+
+void gp106_init_therm_ops(struct gpu_ops *gops) {
+#ifdef CONFIG_DEBUG_FS
+        gops->therm.therm_debugfs_init = gp106_therm_debugfs_init;
+#endif
+}