1 // SPDX-License-Identifier: GPL-2.0-only
10  *  - We cli/sti on stepping A0 CPUs around the FID/VID transition.
13  *  - We disable half multipliers if ACPI is used on A0 stepping CPUs.
38 #include "powernow-k7.h"
82     150, 225, 160, 165, 170, 180, -1, -1,
95 static unsigned int minimum_speed = -1;
107 	delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed;  in check_fsb()
134 	if ((c->x86_model == 6) && (c->x86_stepping == 0)) {  in check_powernow()
180 		return -ENOMEM;  in get_ranges()
275 		/* Going down, so change FID first */  in powernow_target()
303 		retval = -EINVAL;  in powernow_acpi_init()
309 		retval = -ENOMEM;  in powernow_acpi_init()
313 	if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map,  in powernow_acpi_init()
315 		retval = -ENOMEM;  in powernow_acpi_init()
320 		retval = -EIO;  in powernow_acpi_init()
324 	if (acpi_processor_perf->control_register.space_id !=  in powernow_acpi_init()
326 		retval = -ENODEV;  in powernow_acpi_init()
330 	if (acpi_processor_perf->status_register.space_id !=  in powernow_acpi_init()
332 		retval = -ENODEV;  in powernow_acpi_init()
336 	number_scales = acpi_processor_perf->state_count;  in powernow_acpi_init()
339 		retval = -ENODEV;  in powernow_acpi_init()
346 		retval = -ENOMEM;  in powernow_acpi_init()
350 	pc.val = (unsigned long) acpi_processor_perf->states[0].control;  in powernow_acpi_init()
354 			&acpi_processor_perf->states[i];  in powernow_acpi_init()
357 		pc.val = (unsigned long) state->control;  in powernow_acpi_init()
358 		pr_debug("acpi:  P%d: %d MHz %d mW %d uS control %08x SGTC %d\n",  in powernow_acpi_init()
360 			 (u32) state->core_frequency,  in powernow_acpi_init()
361 			 (u32) state->power,  in powernow_acpi_init()
362 			 (u32) state->transition_latency,  in powernow_acpi_init()
363 			 (u32) state->control,  in powernow_acpi_init()
377 		 * get a KHz value (e.g. 1266000). However, powernow-k7 works  in powernow_acpi_init()
398 		if (state->core_frequency != speed_mhz) {  in powernow_acpi_init()
399 			state->core_frequency = speed_mhz;  in powernow_acpi_init()
424 	free_cpumask_var(acpi_processor_perf->shared_cpu_map);  in powernow_acpi_init()
435 …pr_info("no support for ACPI processor found - please recompile your kernel with ACPI processor\n"…  in powernow_acpi_init()
436 	return -EINVAL;  in powernow_acpi_init()
444 		pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid);  in print_pst_entry()
465 			pr_debug("Table version: 0x%x\n", psb->tableversion);  in powernow_decode_bios()
466 			if (psb->tableversion != 0x12) {  in powernow_decode_bios()
468 				return -ENODEV;  in powernow_decode_bios()
471 			pr_debug("Flags: 0x%x\n", psb->flags);  in powernow_decode_bios()
472 			if ((psb->flags & 1) == 0)  in powernow_decode_bios()
473 				pr_debug("Mobile voltage regulator\n");  in powernow_decode_bios()
475 				pr_debug("Desktop voltage regulator\n");  in powernow_decode_bios()
477 			latency = psb->settlingtime;  in powernow_decode_bios()
479 				pr_info("BIOS set settling time to %d microseconds. Should be at least 100. Correcting.\n",  in powernow_decode_bios()
483 			pr_debug("Settling Time: %d microseconds.\n",  in powernow_decode_bios()
484 					psb->settlingtime);  in powernow_decode_bios()
487 					psb->numpst);  in powernow_decode_bios()
493 			for (j = 0; j < psb->numpst; j++) {  in powernow_decode_bios()
495 				number_scales = pst->numpstates;  in powernow_decode_bios()
497 				if ((etuple == pst->cpuid) &&  in powernow_decode_bios()
498 				    check_fsb(pst->fsbspeed) &&  in powernow_decode_bios()
499 				    (maxfid == pst->maxfid) &&  in powernow_decode_bios()
500 				    (startvid == pst->startvid)) {  in powernow_decode_bios()
516 			return -EINVAL;  in powernow_decode_bios()
521 	return -ENODEV;  in powernow_decode_bios()
531  * the "well-known" other OS.
570 		d->ident);  in acer_cpufreq_pst()
598 	if (policy->cpu != 0)  in powernow_cpu_init()
599 		return -ENODEV;  in powernow_cpu_init()
608 		return -EINVAL;  in powernow_cpu_init()
613 		pr_info("PSB/PST known to be broken - trying ACPI instead\n");  in powernow_cpu_init()
621 			minimum_speed = -1;  in powernow_cpu_init()
637 	pr_info("Minimum speed %d MHz - Maximum speed %d MHz\n",  in powernow_cpu_init()
640 	policy->cpuinfo.transition_latency =  in powernow_cpu_init()
642 	policy->freq_table = powernow_table;  in powernow_cpu_init()
652 		free_cpumask_var(acpi_processor_perf->shared_cpu_map);  in powernow_cpu_exit()
670 	.name		= "powernow-k7",
677 		return -ENODEV;  in powernow_init()