1 // SPDX-License-Identifier: GPL-2.0-only
2 /* intel_pch_thermal.c - Intel PCH Thermal driver
28 #define PCH_THERMAL_DID_CNL_H	0xA379 /* CNL-H PCH */
29 #define PCH_THERMAL_DID_CNL_LP	0x02F9 /* CNL-LP PCH */
30 #define PCH_THERMAL_DID_CML_H	0X06F9 /* CML-H PCH */
34 /* Wildcat Point-LP  PCH Thermal registers */
36 #define WPT_TSC	0x04	/* Thermal Sensor Control */
37 #define WPT_TSS	0x06	/* Thermal Sensor Status */
38 #define WPT_TSEL	0x08	/* Thermal Sensor Enable and Lock */
39 #define WPT_TSREL	0x0A	/* Thermal Sensor Report Enable and Lock */
40 #define WPT_TSMIC	0x0C	/* Thermal Sensor SMI Control */
42 #define WPT_TSPM	0x001C	/* Thermal Sensor Power Management */
52 /*  Wildcat Point-LP  PCH Thermal Register bit definitions */
53 #define WPT_TEMP_TSR	0x01ff	/* Temp TS Reading */
54 #define WPT_TSC_CPDE	0x01	/* Catastrophic Power-Down Enable */
55 #define WPT_TSS_TSDSS	0x10	/* Thermal Sensor Dynamic Shutdown Status */
58 #define WPT_TSEL_PLDB	0x80	/* TSEL Policy Lock-Down Bit */
63 /* Resolution of 1/2 degree C and an offset of -50C */
64 #define PCH_TEMP_OFFSET	(-50)
100 	int temp;  in pch_wpt_add_acpi_psv_trip()  local
102 	adev = ACPI_COMPANION(&ptd->pdev->dev);  in pch_wpt_add_acpi_psv_trip()
106 	if (thermal_acpi_passive_trip_temp(adev, &temp) || temp <= 0)  in pch_wpt_add_acpi_psv_trip()
109 	trip->type = THERMAL_TRIP_PASSIVE;  in pch_wpt_add_acpi_psv_trip()
110 	trip->temperature = temp;  in pch_wpt_add_acpi_psv_trip()
121 static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)  in pch_thermal_get_temp()  argument
125 	*temp = GET_WPT_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP));  in pch_thermal_get_temp()
164 	enum pch_board_ids board_id = id->driver_data;  in intel_pch_thermal_probe()
171 	ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);  in intel_pch_thermal_probe()
173 		return -ENOMEM;  in intel_pch_thermal_probe()
176 	ptd->pdev = pdev;  in intel_pch_thermal_probe()
180 		dev_err(&pdev->dev, "failed to enable pci device\n");  in intel_pch_thermal_probe()
186 		dev_err(&pdev->dev, "failed to request pci region\n");  in intel_pch_thermal_probe()
190 	ptd->hw_base = pci_ioremap_bar(pdev, 0);  in intel_pch_thermal_probe()
191 	if (!ptd->hw_base) {  in intel_pch_thermal_probe()
192 		err = -ENOMEM;  in intel_pch_thermal_probe()
193 		dev_err(&pdev->dev, "failed to map mem base\n");  in intel_pch_thermal_probe()
197 	/* Check if BIOS has already enabled thermal sensor */  in intel_pch_thermal_probe()
198 	if (WPT_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL)) {  in intel_pch_thermal_probe()
199 		ptd->bios_enabled = true;  in intel_pch_thermal_probe()
203 	tsel = readb(ptd->hw_base + WPT_TSEL);  in intel_pch_thermal_probe()
205 	 * When TSEL's Policy Lock-Down bit is 1, TSEL become RO.  in intel_pch_thermal_probe()
206 	 * If so, thermal sensor cannot enable. Bail out.  in intel_pch_thermal_probe()
209 		dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");  in intel_pch_thermal_probe()
210 		err = -ENODEV;  in intel_pch_thermal_probe()
214 	writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);  in intel_pch_thermal_probe()
215 	if (!(WPT_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL))) {  in intel_pch_thermal_probe()
216 		dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");  in intel_pch_thermal_probe()
217 		err = -ENODEV;  in intel_pch_thermal_probe()
222 	trip_temp = readw(ptd->hw_base + WPT_CTT);  in intel_pch_thermal_probe()
229 	trip_temp = readw(ptd->hw_base + WPT_PHL);  in intel_pch_thermal_probe()
238 	ptd->tzd = thermal_zone_device_register_with_trips(board_names[board_id],  in intel_pch_thermal_probe()
242 	if (IS_ERR(ptd->tzd)) {  in intel_pch_thermal_probe()
243 		dev_err(&pdev->dev, "Failed to register thermal zone %s\n",  in intel_pch_thermal_probe()
245 		err = PTR_ERR(ptd->tzd);  in intel_pch_thermal_probe()
248 	err = thermal_zone_device_enable(ptd->tzd);  in intel_pch_thermal_probe()
255 	thermal_zone_device_unregister(ptd->tzd);  in intel_pch_thermal_probe()
257 	iounmap(ptd->hw_base);  in intel_pch_thermal_probe()
262 	dev_err(&pdev->dev, "pci device failed to probe\n");  in intel_pch_thermal_probe()
270 	thermal_zone_device_unregister(ptd->tzd);  in intel_pch_thermal_remove()
271 	iounmap(ptd->hw_base);  in intel_pch_thermal_remove()
284 	/* Shutdown the thermal sensor if it is not enabled by BIOS */  in intel_pch_thermal_suspend_noirq()
285 	if (!ptd->bios_enabled) {  in intel_pch_thermal_suspend_noirq()
286 		tsel = readb(ptd->hw_base + WPT_TSEL);  in intel_pch_thermal_suspend_noirq()
287 		writeb(tsel & 0xFE, ptd->hw_base + WPT_TSEL);  in intel_pch_thermal_suspend_noirq()
296 	pch_thr_temp = GET_PCH_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TSPM));  in intel_pch_thermal_suspend_noirq()
299 	pch_cur_temp = GET_PCH_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP));  in intel_pch_thermal_suspend_noirq()
302 		dev_warn(&ptd->pdev->dev,  in intel_pch_thermal_suspend_noirq()
303 …"CPU-PCH current temp [%dC] higher than the threshold temp [%dC], S0ix might fail. Start cooling..…  in intel_pch_thermal_suspend_noirq()
319 			dev_warn(&ptd->pdev->dev, "Wakeup event detected, abort cooling\n");  in intel_pch_thermal_suspend_noirq()
324 		dev_dbg(&ptd->pdev->dev,  in intel_pch_thermal_suspend_noirq()
325 …"CPU-PCH current temp [%dC] higher than the threshold temp [%dC], sleep %d times for %d ms duratio…  in intel_pch_thermal_suspend_noirq()
329 		pch_cur_temp = GET_PCH_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP));  in intel_pch_thermal_suspend_noirq()
333 		dev_warn(&ptd->pdev->dev,  in intel_pch_thermal_suspend_noirq()
334 			"CPU-PCH is hot [%dC] after %d ms delay. S0ix might fail\n",  in intel_pch_thermal_suspend_noirq()
338 			dev_info(&ptd->pdev->dev,  in intel_pch_thermal_suspend_noirq()
339 				"CPU-PCH is cool [%dC] after %d ms delay\n",  in intel_pch_thermal_suspend_noirq()
342 			dev_info(&ptd->pdev->dev,  in intel_pch_thermal_suspend_noirq()
343 				"CPU-PCH is cool [%dC]\n",  in intel_pch_thermal_suspend_noirq()
355 	if (ptd->bios_enabled)  in intel_pch_thermal_resume()
358 	tsel = readb(ptd->hw_base + WPT_TSEL);  in intel_pch_thermal_resume()
360 	writeb(tsel | WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);  in intel_pch_thermal_resume()