1 /*-
2  * Copyright (c) 2003-2005 Nate Lawson (SDG)
90 static int	thr_rid;		/* Driver-wide resource id. */
100 static int	acpi_thr_set(device_t dev, const struct cf_setting *set);
101 static int	acpi_thr_get(device_t dev, struct cf_setting *set);
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()
188 	struct cf_setting set;  in acpi_throttle_attach()  local
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()
221 	 * Set our initial frequency to the highest since some systems  in acpi_throttle_attach()
224 	set.freq = 10000;  in acpi_throttle_attach()
225 	acpi_thr_set(dev, &set);  in acpi_throttle_attach()
242 	if (device_get_unit(sc->cpu_dev) == 0) {  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()
290 		 * systems use it to indicate a fractional set of features  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()
346 	int i, speed;  in acpi_thr_settings()  local
355 	for (i = 0, speed = CPU_MAX_SPEED; speed != 0; i++, speed--) {  in acpi_thr_settings()
356 		sets[i].freq = CPU_SPEED_PERCENT(speed);  in acpi_thr_settings()
365 acpi_thr_set(device_t dev, const struct cf_setting *set)  in acpi_thr_set()  argument
368 	uint32_t clk_val, p_cnt, speed;  in acpi_thr_set()  local
370 	if (set == NULL)  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()
380 	    speed < 1 || speed > 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()
392 	/* If we're at maximum speed, that's all */  in acpi_thr_set()
393 	if (speed < CPU_MAX_SPEED) {  in acpi_thr_set()
395 		clk_val = (CPU_MAX_SPEED - 1) << cpu_duty_offset;  in acpi_thr_set()
397 		p_cnt |= (speed << 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()
410 acpi_thr_get(device_t dev, struct cf_setting *set)  in acpi_thr_get()  argument
415 	if (set == NULL)  in acpi_thr_get()
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()
424 	memset(set, CPUFREQ_VAL_UNKNOWN, sizeof(*set));  in acpi_thr_get()
425 	set->freq = CPU_SPEED_PERCENT(clk_val);  in acpi_thr_get()
426 	set->dev = dev;  in acpi_thr_get()