drm/nouveau/therm/gp100: initial implementation of new gp1xx temperature sensor

v2:
 - add nv138 and drop nv13b chipsets (Ilia Mirkin)
 - refactor out status variable and instead mask tsensor (Ilia Mirkin)
 - switch SHADOWed state message away from nvkm_error() (Ilia Mirkin)
 - rename internal temperature variable (Karol Herbst)

v3:
 - use nvkm_trace() for SHADOWed state message (Ben Skeggs)

Signed-off-by: Rhys Kidd <rhyskidd@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/subdev/therm.h

@@ -97,4 +97,5 @@ int gt215_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int gf119_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int gm107_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 int gm200_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
+int gp100_therm_new(struct nvkm_device *, int, struct nvkm_therm **);
 #endif

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

@@ -2169,6 +2169,7 @@ nv130_chipset = {
 	.ltc = gp100_ltc_new,
 	.mc = gp100_mc_new,
 	.mmu = gf100_mmu_new,
+	.therm = gp100_therm_new,
 	.secboot = gm200_secboot_new,
 	.pci = gp100_pci_new,
 	.pmu = gp100_pmu_new,
@@ -2203,6 +2204,7 @@ nv132_chipset = {
 	.ltc = gp100_ltc_new,
 	.mc = gp100_mc_new,
 	.mmu = gf100_mmu_new,
+	.therm = gp100_therm_new,
 	.secboot = gp102_secboot_new,
 	.pci = gp100_pci_new,
 	.pmu = gp102_pmu_new,
@@ -2237,6 +2239,7 @@ nv134_chipset = {
 	.ltc = gp100_ltc_new,
 	.mc = gp100_mc_new,
 	.mmu = gf100_mmu_new,
+	.therm = gp100_therm_new,
 	.secboot = gp102_secboot_new,
 	.pci = gp100_pci_new,
 	.pmu = gp102_pmu_new,
@@ -2271,6 +2274,7 @@ nv136_chipset = {
 	.ltc = gp100_ltc_new,
 	.mc = gp100_mc_new,
 	.mmu = gf100_mmu_new,
+	.therm = gp100_therm_new,
 	.secboot = gp102_secboot_new,
 	.pci = gp100_pci_new,
 	.pmu = gp102_pmu_new,
@@ -2305,6 +2309,7 @@ nv137_chipset = {
 	.ltc = gp100_ltc_new,
 	.mc = gp100_mc_new,
 	.mmu = gf100_mmu_new,
+	.therm = gp100_therm_new,
 	.secboot = gp102_secboot_new,
 	.pci = gp100_pci_new,
 	.pmu = gp102_pmu_new,
@@ -2339,6 +2344,7 @@ nv138_chipset = {
 	.ltc = gp100_ltc_new,
 	.mc = gp100_mc_new,
 	.mmu = gf100_mmu_new,
+	.therm = gp100_therm_new,
 	.pci = gp100_pci_new,
 	.pmu = gp102_pmu_new,
 	.timer = gk20a_timer_new,

drivers/gpu/drm/nouveau/nvkm/subdev/therm/Kbuild

@@ -12,3 +12,4 @@ nvkm-y += nvkm/subdev/therm/gt215.o
 nvkm-y += nvkm/subdev/therm/gf119.o
 nvkm-y += nvkm/subdev/therm/gm107.o
 nvkm-y += nvkm/subdev/therm/gm200.o
+nvkm-y += nvkm/subdev/therm/gp100.o

drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c

@@ -341,7 +341,8 @@ nvkm_therm_init(struct nvkm_subdev *subdev)
 {
 	struct nvkm_therm *therm = nvkm_therm(subdev);
 
-	therm->func->init(therm);
+	if (therm->func->init)
+		therm->func->init(therm);
 
 	if (therm->suspend >= 0) {
 		/* restore the pwm value only when on manual or auto mode */

drivers/gpu/drm/nouveau/nvkm/subdev/therm/gp100.c

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2017 Rhys Kidd
+ *
+ * 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.
+ *
+ * Authors: Rhys Kidd
+ */
+#include "priv.h"
+
+static int
+gp100_temp_get(struct nvkm_therm *therm)
+{
+	struct nvkm_device *device = therm->subdev.device;
+	struct nvkm_subdev *subdev = &therm->subdev;
+	u32 tsensor = nvkm_rd32(device, 0x020460);
+	u32 inttemp = (tsensor & 0x0001fff8);
+
+	/* device SHADOWed */
+	if (tsensor & 0x40000000)
+		nvkm_trace(subdev, "reading temperature from SHADOWed sensor\n");
+
+	/* device valid */
+	if (tsensor & 0x20000000)
+		return (inttemp >> 8);
+	else
+		return -ENODEV;
+}
+
+static const struct nvkm_therm_func
+gp100_therm = {
+	.temp_get = gp100_temp_get,
+	.program_alarms = nvkm_therm_program_alarms_polling,
+};
+
+int
+gp100_therm_new(struct nvkm_device *device, int index,
+		struct nvkm_therm **ptherm)
+{
+	return nvkm_therm_new_(&gp100_therm, device, index, ptherm);
+}