Add first hints of thermal monitoring on radeon cards

* add a few missing/needed header defines
* show GPU temp in millidegrees C on r600/r700
* evergreen+ support soon
* function may be moved to driver long term once testing done

headers/private/graphics/radeon_hd/r600_reg.h

@@ -183,4 +183,10 @@
 #define R600_HDMI_CONFIG1                 0x7600
 #define R600_HDMI_CONFIG2                 0x7a00
 
+/* Thermal information */
+#define	R600_CG_THERMAL_STATUS			0x7F4
+#define		R600_ASIC_T(x)				((x) << 0)
+#define		R600_ASIC_T_MASK			0x1FF
+#define		R600_ASIC_T_SHIFT			0
+
 #endif

headers/private/graphics/radeon_hd/r700_reg.h

@@ -121,13 +121,13 @@
 #define		CMDFIFO_AVAIL_MASK				0x0000000F
 #define		GUI_ACTIVE					(1<<31)
 #define	GRBM_STATUS2					0x8014
-
-#define	CG_MULT_THERMAL_STATUS				0x740
-#define		ASIC_T(x)			        ((x) << 16)
-#define		ASIC_T_MASK			        0x3FF0000
-#define		ASIC_T_SHIFT			        16
 #endif
 
+#define	R700_CG_MULT_THERMAL_STATUS			0x740
+#define		R700_ASIC_T(x)			        ((x) << 16)
+#define		R700_ASIC_T_MASK		        0x3FF0000
+#define		R700_ASIC_T_SHIFT		        16
+
 #define	HDP_HOST_PATH_CNTL					0x2C00
 #define	HDP_NONSURFACE_BASE					0x2C04
 #define	HDP_NONSURFACE_INFO					0x2C08

src/add-ons/accelerants/radeon_hd/accelerant.cpp

@@ -287,6 +287,9 @@ radeon_init_accelerant(int device)
 
 	radeon_gpu_mc_setup();
 
+	TRACE("%s: Current GPU temperature: %" B_PRId32 " mC\n",
+		__func__, radeon_get_temp());
+
 	TRACE("%s done\n", __func__);
 	return B_OK;
 }

src/add-ons/accelerants/radeon_hd/gpu.cpp

@@ -774,3 +774,43 @@ radeon_gpu_gpio_setup()
 
 	return B_OK;
 }
+
+
+int32
+radeon_get_temp()
+{
+	// return GPU temp in millidegrees C
+
+	radeon_shared_info &info = *gInfo->shared_info;
+
+	uint32 rawTemp = 0;	// temp
+	int32 finalTemp = 0; // actual_temp
+
+	if (info.chipsetID >= RADEON_RV770) {
+		rawTemp = (Read32(OUT, R700_CG_MULT_THERMAL_STATUS) & R700_ASIC_T_MASK)
+			>> R700_ASIC_T_SHIFT;
+		if (rawTemp & 0x400)
+			finalTemp = -256;
+		else if (rawTemp & 0x200)
+			finalTemp = 255;
+		else if (rawTemp & 0x100) {
+			finalTemp = rawTemp & 0x1ff;
+			finalTemp |= ~0x1ff;
+		} else
+			finalTemp = rawTemp & 0xff;
+
+		return (finalTemp * 1000) / 2;
+
+	} else if (info.chipsetID >= RADEON_R600) {
+		rawTemp = (Read32(OUT, R600_CG_THERMAL_STATUS) & R600_ASIC_T_MASK)
+			>> R600_ASIC_T_SHIFT;
+		finalTemp = rawTemp & 0xff;
+
+		if (rawTemp & 0x100)
+			finalTemp -= 256;
+
+		return finalTemp * 1000;
+	}
+
+	return -1;
+}

src/add-ons/accelerants/radeon_hd/gpu.h

@@ -177,6 +177,7 @@ status_t radeon_gpu_irq_setup();
 status_t radeon_gpu_gpio_setup();
 status_t radeon_gpu_i2c_attach(uint32 id, uint8 hw_line);
 bool radeon_gpu_read_edid(uint32 connector, edid1_info *edid);
+int32 radeon_get_temp();
 
 
 #endif