1 /*-
2  * Copyright (c) 2003-2005 Nate Lawson (SDG)
50  * clock cycle.  It does not change voltage and so is less efficient than
90 static int	thr_rid;		/* Driver-wide resource id. */
134 	if (device_find_child(parent, "acpi_throttle", -1))  in acpi_throttle_identify()
137 	/* Check for a valid duty width and parent CPU type. */  in acpi_throttle_identify()
146 	 * Add a child if there's a non-NULL P_BLK and correct length, or  in acpi_throttle_identify()
154 	if ((obj->Processor.PblkAddress && obj->Processor.PblkLength >= 4) ||  in acpi_throttle_identify()
172 	 * the chipset modulating the STPCLK# pin based on the duty cycle.  in acpi_throttle_probe()
176 	if (device_find_child(device_get_parent(dev), "p4tcc", -1) &&  in acpi_throttle_probe()
195 	sc->cpu_dev = dev;  in acpi_throttle_attach()
196 	sc->cpu_handle = acpi_get_handle(dev);  in acpi_throttle_attach()
200 	status = AcpiEvaluateObject(sc->cpu_handle, NULL, NULL, &buf);  in acpi_throttle_attach()
202 		device_printf(dev, "attach failed to get Processor obj - %s\n",  in acpi_throttle_attach()
207 	sc->cpu_p_blk = obj->Processor.PblkAddress;  in acpi_throttle_attach()
208 	sc->cpu_p_blk_len = obj->Processor.PblkLength;  in acpi_throttle_attach()
242 	if (device_get_unit(sc->cpu_dev) == 0) {  in acpi_throttle_evaluate()
249 	/* Validate the duty offset/width. */  in acpi_throttle_evaluate()
250 	duty_end = cpu_duty_offset + cpu_duty_width - 1;  in acpi_throttle_evaluate()
252 		device_printf(sc->cpu_dev,  in acpi_throttle_evaluate()
257 		device_printf(sc->cpu_dev,  in acpi_throttle_evaluate()
271 	status = AcpiEvaluateObject(sc->cpu_handle, "_PTC", NULL, &buf);  in acpi_throttle_evaluate()
274 			device_printf(sc->cpu_dev, "_PTC buffer too small\n");  in acpi_throttle_evaluate()
278 		acpi_bus_alloc_gas(sc->cpu_dev, &sc->cpu_p_type, &thr_rid,  in acpi_throttle_evaluate()
279 		    &gas, &sc->cpu_p_cnt, 0);  in acpi_throttle_evaluate()
280 		if (sc->cpu_p_cnt != NULL && bootverbose) {  in acpi_throttle_evaluate()
281 			device_printf(sc->cpu_dev, "P_CNT from _PTC %#jx\n",  in acpi_throttle_evaluate()
287 	if (sc->cpu_p_cnt == NULL) {  in acpi_throttle_evaluate()
293 		if (sc->cpu_p_blk_len < 4)  in acpi_throttle_evaluate()
295 		gas.Address = sc->cpu_p_blk;  in acpi_throttle_evaluate()
298 		acpi_bus_alloc_gas(sc->cpu_dev, &sc->cpu_p_type, &thr_rid,  in acpi_throttle_evaluate()
299 		    &gas, &sc->cpu_p_cnt, 0);  in acpi_throttle_evaluate()
300 		if (sc->cpu_p_cnt != NULL) {  in acpi_throttle_evaluate()
302 				device_printf(sc->cpu_dev,  in acpi_throttle_evaluate()
303 				    "P_CNT from P_BLK %#x\n", sc->cpu_p_blk);  in acpi_throttle_evaluate()
305 			device_printf(sc->cpu_dev, "failed to attach P_CNT\n");  in acpi_throttle_evaluate()
325 		 * Disable throttling control on PIIX4 A and B-step.  in acpi_throttle_quirks()
326 		 * See specification changes #13 ("Manual Throttle Duty Cycle")  in acpi_throttle_quirks()
355 	for (i = 0, speed = CPU_MAX_SPEED; speed != 0; i++, speed--) {  in acpi_thr_settings()
375 	 * Validate requested state converts to a duty cycle that is an  in acpi_thr_set()
378 	speed = set->freq * CPU_MAX_SPEED / 10000;  in acpi_thr_set()
379 	if (speed * 10000 != set->freq * CPU_MAX_SPEED ||  in acpi_thr_set()
384 	if (speed == sc->cpu_thr_state)  in acpi_thr_set()
388 	p_cnt = THR_GET_REG(sc->cpu_p_cnt);  in acpi_thr_set()
390 	THR_SET_REG(sc->cpu_p_cnt, p_cnt);  in acpi_thr_set()
395 		clk_val = (CPU_MAX_SPEED - 1) << cpu_duty_offset;  in acpi_thr_set()
400 		THR_SET_REG(sc->cpu_p_cnt, p_cnt);  in acpi_thr_set()
402 		THR_SET_REG(sc->cpu_p_cnt, p_cnt);  in acpi_thr_set()
404 	sc->cpu_thr_state = speed;  in acpi_thr_set()
420 	p_cnt = THR_GET_REG(sc->cpu_p_cnt);  in acpi_thr_get()
421 	clk_val = (p_cnt >> cpu_duty_offset) & (CPU_MAX_SPEED - 1);  in acpi_thr_get()
422 	sc->cpu_thr_state = clk_val;  in acpi_thr_get()
425 	set->freq = CPU_SPEED_PERCENT(clk_val);  in acpi_thr_get()
426 	set->dev = dev;  in acpi_thr_get()