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>

drivers/gpu/nvgpu/Makefile.nvgpu-t18x

@@ -41,7 +41,8 @@ nvgpu-y += \
 	$(nvgpu-t18x)/perf/perf.o \
 	$(nvgpu-t18x)/clk/clk.o \
 	$(nvgpu-t18x)/gp106/clk_gp106.o \
-	$(nvgpu-t18x)/gp106/gp106_gating_reglist.o
+	$(nvgpu-t18x)/gp106/gp106_gating_reglist.o \
+	$(nvgpu-t18x)/gp106/therm_gp106.o
 
 nvgpu-$(CONFIG_TEGRA_GK20A) += $(nvgpu-t18x)/gp10b/platform_gp10b_tegra.o
 

drivers/gpu/nvgpu/gp106/hal_gp106.c

@@ -28,7 +28,7 @@
 #include "gp106/fifo_gp106.h"
 #include "gp10b/regops_gp10b.h"
 #include "gp10b/cde_gp10b.h"
-#include "gp10b/therm_gp10b.h"
+#include "gp106/therm_gp106.h"
 
 #include "gm206/bios_gm206.h"
 
@@ -209,6 +209,7 @@ int gp106_init_hal(struct gk20a *g)
 	gk20a_init_css_ops(gops);
 #endif
 	gm206_init_bios(gops);
+	gp106_init_therm_ops(gops);
 	gops->name = "gp10x";
 	gops->get_litter_value = gp106_get_litter_value;
 	gops->chip_init_gpu_characteristics = gk20a_init_gpu_characteristics;

drivers/gpu/nvgpu/gp106/hw_therm_gp106.h

@@ -0,0 +1,97 @@
+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Function naming determines intended use:
+ *
+ *     <x>_r(void) : Returns the offset for register <x>.
+ *
+ *     <x>_o(void) : Returns the offset for element <x>.
+ *
+ *     <x>_w(void) : Returns the word offset for word (4 byte) element <x>.
+ *
+ *     <x>_<y>_s(void) : Returns size of field <y> of register <x> in bits.
+ *
+ *     <x>_<y>_f(u32 v) : Returns a value based on 'v' which has been shifted
+ *         and masked to place it at field <y> of register <x>.  This value
+ *         can be |'d with others to produce a full register value for
+ *         register <x>.
+ *
+ *     <x>_<y>_m(void) : Returns a mask for field <y> of register <x>.  This
+ *         value can be ~'d and then &'d to clear the value of field <y> for
+ *         register <x>.
+ *
+ *     <x>_<y>_<z>_f(void) : Returns the constant value <z> after being shifted
+ *         to place it at field <y> of register <x>.  This value can be |'d
+ *         with others to produce a full register value for <x>.
+ *
+ *     <x>_<y>_v(u32 r) : Returns the value of field <y> from a full register
+ *         <x> value 'r' after being shifted to place its LSB at bit 0.
+ *         This value is suitable for direct comparison with other unshifted
+ *         values appropriate for use in field <y> of register <x>.
+ *
+ *     <x>_<y>_<z>_v(void) : Returns the constant value for <z> defined for
+ *         field <y> of register <x>.  This value is suitable for direct
+ *         comparison with unshifted values appropriate for use in field <y>
+ *         of register <x>.
+ */
+#ifndef _hw_therm_gp106_h_
+#define _hw_therm_gp106_h_
+
+static inline u32 therm_temp_sensor_tsense_r(void)
+{
+	return 0x00020460;
+}
+static inline u32 therm_temp_sensor_tsense_fixed_point_f(u32 v)
+{
+	return (v & 0x3fff) << 3;
+}
+static inline u32 therm_temp_sensor_tsense_fixed_point_m(void)
+{
+	return 0x3fff << 3;
+}
+static inline u32 therm_temp_sensor_tsense_fixed_point_v(u32 r)
+{
+	return (r >> 3) & 0x3fff;
+}
+static inline u32 therm_temp_sensor_tsense_fixed_point_min_v(void)
+{
+	return 0x00003b00;
+}
+static inline u32 therm_temp_sensor_tsense_fixed_point_max_v(void)
+{
+	return 0x000010e0;
+}
+static inline u32 therm_temp_sensor_tsense_state_f(u32 v)
+{
+	return (v & 0x3) << 29;
+}
+static inline u32 therm_temp_sensor_tsense_state_m(void)
+{
+	return 0x3 << 29;
+}
+static inline u32 therm_temp_sensor_tsense_state_v(u32 r)
+{
+	return (r >> 29) & 0x3;
+}
+static inline u32 therm_temp_sensor_tsense_state_valid_v(void)
+{
+	return 0x00000001;
+}
+static inline u32 therm_temp_sensor_tsense_state_shadow_v(void)
+{
+	return 0x00000002;
+}
+#endif

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
+}

drivers/gpu/nvgpu/gp106/therm_gp106.h

@@ -0,0 +1,22 @@
+/*
+ * general thermal control structures & definitions
+ *
+ * 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.
+ */
+
+#ifndef NVGPU_THERM_GP106_H
+#define NVGPU_THERM_GP106_H
+
+#include "gk20a/gk20a.h"
+
+void gp106_init_therm_ops(struct gpu_ops *gops);
+#endif