powernow-k8.c 32.8 KB
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/*
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 *   (c) 2003-2012 Advanced Micro Devices, Inc.
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 *  Your use of this code is subject to the terms and conditions of the
 *  GNU general public license version 2. See "COPYING" or
 *  http://www.gnu.org/licenses/gpl.html
 *
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 *  Maintainer:
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 *  Andreas Herrmann <herrmann.der.user@googlemail.com>
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 *
 *  Based on the powernow-k7.c module written by Dave Jones.
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 *  (C) 2003 Dave Jones on behalf of SuSE Labs
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 *  (C) 2004 Dominik Brodowski <linux@brodo.de>
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 *  (C) 2004 Pavel Machek <pavel@ucw.cz>
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 *  Licensed under the terms of the GNU GPL License version 2.
 *  Based upon datasheets & sample CPUs kindly provided by AMD.
 *
 *  Valuable input gratefully received from Dave Jones, Pavel Machek,
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 *  Dominik Brodowski, Jacob Shin, and others.
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 *  Originally developed by Paul Devriendt.
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 *
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 *  Processor information obtained from Chapter 9 (Power and Thermal
 *  Management) of the "BIOS and Kernel Developer's Guide (BKDG) for
 *  the AMD Athlon 64 and AMD Opteron Processors" and section "2.x
 *  Power Management" in BKDGs for newer AMD CPU families.
 *
 *  Tables for specific CPUs can be inferred from AMD's processor
 *  power and thermal data sheets, (e.g. 30417.pdf, 30430.pdf, 43375.pdf)
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 */

#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/string.h>
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#include <linux/cpumask.h>
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#include <linux/io.h>
#include <linux/delay.h>
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#include <asm/msr.h>
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#include <asm/cpu_device_id.h>
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#include <linux/acpi.h>
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#include <linux/mutex.h>
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#include <acpi/processor.h>

#define PFX "powernow-k8: "
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#define VERSION "version 2.20.00"
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#include "powernow-k8.h"

/* serialize freq changes  */
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static DEFINE_MUTEX(fidvid_mutex);
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static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
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static struct cpufreq_driver cpufreq_amd64_driver;

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#ifndef CONFIG_SMP
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static inline const struct cpumask *cpu_core_mask(int cpu)
{
	return cpumask_of(0);
}
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#endif

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/* Return a frequency in MHz, given an input fid */
static u32 find_freq_from_fid(u32 fid)
{
	return 800 + (fid * 100);
}

/* Return a frequency in KHz, given an input fid */
static u32 find_khz_freq_from_fid(u32 fid)
{
	return 1000 * find_freq_from_fid(fid);
}

/* Return the vco fid for an input fid
 *
 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
 * only from corresponding high fids. This returns "high" fid corresponding to
 * "low" one.
 */
static u32 convert_fid_to_vco_fid(u32 fid)
{
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	if (fid < HI_FID_TABLE_BOTTOM)
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		return 8 + (2 * fid);
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	else
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		return fid;
}

/*
 * Return 1 if the pending bit is set. Unless we just instructed the processor
 * to transition to a new state, seeing this bit set is really bad news.
 */
static int pending_bit_stuck(void)
{
	u32 lo, hi;

	rdmsr(MSR_FIDVID_STATUS, lo, hi);
	return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
}

/*
 * Update the global current fid / vid values from the status msr.
 * Returns 1 on error.
 */
static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
{
	u32 lo, hi;
	u32 i = 0;

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	do {
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		if (i++ > 10000) {
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			pr_debug("detected change pending stuck\n");
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			return 1;
		}
		rdmsr(MSR_FIDVID_STATUS, lo, hi);
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	} while (lo & MSR_S_LO_CHANGE_PENDING);
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	data->currvid = hi & MSR_S_HI_CURRENT_VID;
	data->currfid = lo & MSR_S_LO_CURRENT_FID;

	return 0;
}

/* the isochronous relief time */
static void count_off_irt(struct powernow_k8_data *data)
{
	udelay((1 << data->irt) * 10);
	return;
}

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/* the voltage stabilization time */
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static void count_off_vst(struct powernow_k8_data *data)
{
	udelay(data->vstable * VST_UNITS_20US);
	return;
}

/* need to init the control msr to a safe value (for each cpu) */
static void fidvid_msr_init(void)
{
	u32 lo, hi;
	u8 fid, vid;

	rdmsr(MSR_FIDVID_STATUS, lo, hi);
	vid = hi & MSR_S_HI_CURRENT_VID;
	fid = lo & MSR_S_LO_CURRENT_FID;
	lo = fid | (vid << MSR_C_LO_VID_SHIFT);
	hi = MSR_C_HI_STP_GNT_BENIGN;
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	pr_debug("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
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	wrmsr(MSR_FIDVID_CTL, lo, hi);
}

/* write the new fid value along with the other control fields to the msr */
static int write_new_fid(struct powernow_k8_data *data, u32 fid)
{
	u32 lo;
	u32 savevid = data->currvid;
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	u32 i = 0;
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	if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
		printk(KERN_ERR PFX "internal error - overflow on fid write\n");
		return 1;
	}

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	lo = fid;
	lo |= (data->currvid << MSR_C_LO_VID_SHIFT);
	lo |= MSR_C_LO_INIT_FID_VID;
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	pr_debug("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
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		fid, lo, data->plllock * PLL_LOCK_CONVERSION);

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	do {
		wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
		if (i++ > 100) {
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			printk(KERN_ERR PFX
				"Hardware error - pending bit very stuck - "
				"no further pstate changes possible\n");
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			return 1;
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		}
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	} while (query_current_values_with_pending_wait(data));
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	count_off_irt(data);

	if (savevid != data->currvid) {
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		printk(KERN_ERR PFX
			"vid change on fid trans, old 0x%x, new 0x%x\n",
			savevid, data->currvid);
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		return 1;
	}

	if (fid != data->currfid) {
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		printk(KERN_ERR PFX
			"fid trans failed, fid 0x%x, curr 0x%x\n", fid,
			data->currfid);
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		return 1;
	}

	return 0;
}

/* Write a new vid to the hardware */
static int write_new_vid(struct powernow_k8_data *data, u32 vid)
{
	u32 lo;
	u32 savefid = data->currfid;
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	int i = 0;
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	if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
		printk(KERN_ERR PFX "internal error - overflow on vid write\n");
		return 1;
	}

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	lo = data->currfid;
	lo |= (vid << MSR_C_LO_VID_SHIFT);
	lo |= MSR_C_LO_INIT_FID_VID;
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	pr_debug("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
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		vid, lo, STOP_GRANT_5NS);

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	do {
		wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
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		if (i++ > 100) {
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			printk(KERN_ERR PFX "internal error - pending bit "
					"very stuck - no further pstate "
					"changes possible\n");
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			return 1;
		}
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	} while (query_current_values_with_pending_wait(data));
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	if (savefid != data->currfid) {
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		printk(KERN_ERR PFX "fid changed on vid trans, old "
			"0x%x new 0x%x\n",
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		       savefid, data->currfid);
		return 1;
	}

	if (vid != data->currvid) {
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		printk(KERN_ERR PFX "vid trans failed, vid 0x%x, "
				"curr 0x%x\n",
				vid, data->currvid);
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		return 1;
	}

	return 0;
}

/*
 * Reduce the vid by the max of step or reqvid.
 * Decreasing vid codes represent increasing voltages:
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 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
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 */
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static int decrease_vid_code_by_step(struct powernow_k8_data *data,
		u32 reqvid, u32 step)
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{
	if ((data->currvid - reqvid) > step)
		reqvid = data->currvid - step;

	if (write_new_vid(data, reqvid))
		return 1;

	count_off_vst(data);

	return 0;
}

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/* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
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static int transition_fid_vid(struct powernow_k8_data *data,
		u32 reqfid, u32 reqvid)
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{
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	if (core_voltage_pre_transition(data, reqvid, reqfid))
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		return 1;

	if (core_frequency_transition(data, reqfid))
		return 1;

	if (core_voltage_post_transition(data, reqvid))
		return 1;

	if (query_current_values_with_pending_wait(data))
		return 1;

	if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
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		printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, "
				"curr 0x%x 0x%x\n",
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				smp_processor_id(),
				reqfid, reqvid, data->currfid, data->currvid);
		return 1;
	}

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	pr_debug("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
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		smp_processor_id(), data->currfid, data->currvid);

	return 0;
}

/* Phase 1 - core voltage transition ... setup voltage */
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static int core_voltage_pre_transition(struct powernow_k8_data *data,
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		u32 reqvid, u32 reqfid)
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{
	u32 rvosteps = data->rvo;
	u32 savefid = data->currfid;
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	u32 maxvid, lo, rvomult = 1;
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	pr_debug("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, "
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		"reqvid 0x%x, rvo 0x%x\n",
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		smp_processor_id(),
		data->currfid, data->currvid, reqvid, data->rvo);

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	if ((savefid < LO_FID_TABLE_TOP) && (reqfid < LO_FID_TABLE_TOP))
		rvomult = 2;
	rvosteps *= rvomult;
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	rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
	maxvid = 0x1f & (maxvid >> 16);
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	pr_debug("ph1 maxvid=0x%x\n", maxvid);
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	if (reqvid < maxvid) /* lower numbers are higher voltages */
		reqvid = maxvid;

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	while (data->currvid > reqvid) {
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		pr_debug("ph1: curr 0x%x, req vid 0x%x\n",
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			data->currvid, reqvid);
		if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
			return 1;
	}

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	while ((rvosteps > 0) &&
			((rvomult * data->rvo + data->currvid) > reqvid)) {
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		if (data->currvid == maxvid) {
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			rvosteps = 0;
		} else {
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			pr_debug("ph1: changing vid for rvo, req 0x%x\n",
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				data->currvid - 1);
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			if (decrease_vid_code_by_step(data, data->currvid-1, 1))
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				return 1;
			rvosteps--;
		}
	}

	if (query_current_values_with_pending_wait(data))
		return 1;

	if (savefid != data->currfid) {
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		printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n",
				data->currfid);
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		return 1;
	}

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	pr_debug("ph1 complete, currfid 0x%x, currvid 0x%x\n",
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		data->currfid, data->currvid);

	return 0;
}

/* Phase 2 - core frequency transition */
static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
{
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	u32 vcoreqfid, vcocurrfid, vcofiddiff;
	u32 fid_interval, savevid = data->currvid;
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	if (data->currfid == reqfid) {
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		printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n",
				data->currfid);
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		return 0;
	}

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	pr_debug("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, "
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		"reqfid 0x%x\n",
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		smp_processor_id(),
		data->currfid, data->currvid, reqfid);

	vcoreqfid = convert_fid_to_vco_fid(reqfid);
	vcocurrfid = convert_fid_to_vco_fid(data->currfid);
	vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
	    : vcoreqfid - vcocurrfid;

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	if ((reqfid <= LO_FID_TABLE_TOP) && (data->currfid <= LO_FID_TABLE_TOP))
		vcofiddiff = 0;

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	while (vcofiddiff > 2) {
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		(data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);

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		if (reqfid > data->currfid) {
			if (data->currfid > LO_FID_TABLE_TOP) {
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				if (write_new_fid(data,
						data->currfid + fid_interval))
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					return 1;
			} else {
				if (write_new_fid
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				    (data,
				     2 + convert_fid_to_vco_fid(data->currfid)))
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					return 1;
			}
		} else {
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			if (write_new_fid(data, data->currfid - fid_interval))
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				return 1;
		}

		vcocurrfid = convert_fid_to_vco_fid(data->currfid);
		vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
		    : vcoreqfid - vcocurrfid;
	}

	if (write_new_fid(data, reqfid))
		return 1;

	if (query_current_values_with_pending_wait(data))
		return 1;

	if (data->currfid != reqfid) {
		printk(KERN_ERR PFX
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			"ph2: mismatch, failed fid transition, "
			"curr 0x%x, req 0x%x\n",
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			data->currfid, reqfid);
		return 1;
	}

	if (savevid != data->currvid) {
		printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
			savevid, data->currvid);
		return 1;
	}

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	pr_debug("ph2 complete, currfid 0x%x, currvid 0x%x\n",
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		data->currfid, data->currvid);

	return 0;
}

/* Phase 3 - core voltage transition flow ... jump to the final vid. */
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static int core_voltage_post_transition(struct powernow_k8_data *data,
		u32 reqvid)
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{
	u32 savefid = data->currfid;
	u32 savereqvid = reqvid;

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	pr_debug("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
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		smp_processor_id(),
		data->currfid, data->currvid);

	if (reqvid != data->currvid) {
		if (write_new_vid(data, reqvid))
			return 1;

		if (savefid != data->currfid) {
			printk(KERN_ERR PFX
			       "ph3: bad fid change, save 0x%x, curr 0x%x\n",
			       savefid, data->currfid);
			return 1;
		}

		if (data->currvid != reqvid) {
			printk(KERN_ERR PFX
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			       "ph3: failed vid transition\n, "
			       "req 0x%x, curr 0x%x",
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			       reqvid, data->currvid);
			return 1;
		}
	}

	if (query_current_values_with_pending_wait(data))
		return 1;

	if (savereqvid != data->currvid) {
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		pr_debug("ph3 failed, currvid 0x%x\n", data->currvid);
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		return 1;
	}

	if (savefid != data->currfid) {
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		pr_debug("ph3 failed, currfid changed 0x%x\n",
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			data->currfid);
		return 1;
	}

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	pr_debug("ph3 complete, currfid 0x%x, currvid 0x%x\n",
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		data->currfid, data->currvid);

	return 0;
}

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static const struct x86_cpu_id powernow_k8_ids[] = {
	/* IO based frequency switching */
	{ X86_VENDOR_AMD, 0xf },
	{}
};
MODULE_DEVICE_TABLE(x86cpu, powernow_k8_ids);

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static void check_supported_cpu(void *_rc)
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{
	u32 eax, ebx, ecx, edx;
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	int *rc = _rc;
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	*rc = -ENODEV;
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	eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
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	if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
		if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
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		    ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
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			printk(KERN_INFO PFX
				"Processor cpuid %x not supported\n", eax);
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			return;
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		}
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		eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
		if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
			printk(KERN_INFO PFX
			       "No frequency change capabilities detected\n");
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			return;
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		}
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		cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
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		if ((edx & P_STATE_TRANSITION_CAPABLE)
			!= P_STATE_TRANSITION_CAPABLE) {
			printk(KERN_INFO PFX
				"Power state transitions not supported\n");
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			return;
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		}
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		*rc = 0;
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	}
}

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static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
		u8 maxvid)
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{
	unsigned int j;
	u8 lastfid = 0xff;

	for (j = 0; j < data->numps; j++) {
		if (pst[j].vid > LEAST_VID) {
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			printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
			       j, pst[j].vid);
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			return -EINVAL;
		}
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		if (pst[j].vid < data->rvo) {
			/* vid + rvo >= 0 */
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			printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
			       " %d\n", j);
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			return -ENODEV;
		}
542 543
		if (pst[j].vid < maxvid + data->rvo) {
			/* vid + rvo >= maxvid */
544 545
			printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
			       " %d\n", j);
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			return -ENODEV;
		}
548
		if (pst[j].fid > MAX_FID) {
549 550
			printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
			       " %d\n", j);
551 552 553
			return -ENODEV;
		}
		if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
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			/* Only first fid is allowed to be in "low" range */
555 556
			printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
			       "0x%x\n", j, pst[j].fid);
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			return -EINVAL;
		}
		if (pst[j].fid < lastfid)
			lastfid = pst[j].fid;
	}
	if (lastfid & 1) {
563
		printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
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		return -EINVAL;
	}
	if (lastfid > LO_FID_TABLE_TOP)
567 568
		printk(KERN_INFO FW_BUG PFX
			"first fid not from lo freq table\n");
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	return 0;
}

573 574
static void invalidate_entry(struct cpufreq_frequency_table *powernow_table,
		unsigned int entry)
575
{
576
	powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
577 578
}

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static void print_basics(struct powernow_k8_data *data)
{
	int j;
	for (j = 0; j < data->numps; j++) {
583 584 585
		if (data->powernow_table[j].frequency !=
				CPUFREQ_ENTRY_INVALID) {
				printk(KERN_INFO PFX
586
					"fid 0x%x (%d MHz), vid 0x%x\n",
587 588 589
					data->powernow_table[j].index & 0xff,
					data->powernow_table[j].frequency/1000,
					data->powernow_table[j].index >> 8);
590
		}
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	}
	if (data->batps)
593 594
		printk(KERN_INFO PFX "Only %d pstates on battery\n",
				data->batps);
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}

597 598
static int fill_powernow_table(struct powernow_k8_data *data,
		struct pst_s *pst, u8 maxvid)
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{
	struct cpufreq_frequency_table *powernow_table;
	unsigned int j;

603 604 605 606 607
	if (data->batps) {
		/* use ACPI support to get full speed on mains power */
		printk(KERN_WARNING PFX
			"Only %d pstates usable (use ACPI driver for full "
			"range\n", data->batps);
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		data->numps = data->batps;
	}

611
	for (j = 1; j < data->numps; j++) {
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		if (pst[j-1].fid >= pst[j].fid) {
			printk(KERN_ERR PFX "PST out of sequence\n");
			return -EINVAL;
		}
	}

	if (data->numps < 2) {
		printk(KERN_ERR PFX "no p states to transition\n");
		return -ENODEV;
	}

	if (check_pst_table(data, pst, maxvid))
		return -EINVAL;

	powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
		* (data->numps + 1)), GFP_KERNEL);
	if (!powernow_table) {
		printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
		return -ENOMEM;
	}

	for (j = 0; j < data->numps; j++) {
634
		int freq;
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		powernow_table[j].index = pst[j].fid; /* lower 8 bits */
		powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
637 638
		freq = find_khz_freq_from_fid(pst[j].fid);
		powernow_table[j].frequency = freq;
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	}
	powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
	powernow_table[data->numps].index = 0;

	if (query_current_values_with_pending_wait(data)) {
		kfree(powernow_table);
		return -EIO;
	}

648
	pr_debug("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
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	data->powernow_table = powernow_table;
650
	if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
651
		print_basics(data);
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	for (j = 0; j < data->numps; j++)
654 655
		if ((pst[j].fid == data->currfid) &&
		    (pst[j].vid == data->currvid))
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			return 0;

658
	pr_debug("currfid/vid do not match PST, ignoring\n");
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	return 0;
}

/* Find and validate the PSB/PST table in BIOS. */
static int find_psb_table(struct powernow_k8_data *data)
{
	struct psb_s *psb;
	unsigned int i;
	u32 mvs;
	u8 maxvid;
	u32 cpst = 0;
	u32 thiscpuid;

	for (i = 0xc0000; i < 0xffff0; i += 0x10) {
		/* Scan BIOS looking for the signature. */
		/* It can not be at ffff0 - it is too big. */

		psb = phys_to_virt(i);
		if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
			continue;

680
		pr_debug("found PSB header at 0x%p\n", psb);
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681

682
		pr_debug("table vers: 0x%x\n", psb->tableversion);
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		if (psb->tableversion != PSB_VERSION_1_4) {
684
			printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
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			return -ENODEV;
		}

688
		pr_debug("flags: 0x%x\n", psb->flags1);
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689
		if (psb->flags1) {
690
			printk(KERN_ERR FW_BUG PFX "unknown flags\n");
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			return -ENODEV;
		}

		data->vstable = psb->vstable;
695
		pr_debug("voltage stabilization time: %d(*20us)\n",
696
				data->vstable);
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697

698
		pr_debug("flags2: 0x%x\n", psb->flags2);
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		data->rvo = psb->flags2 & 3;
		data->irt = ((psb->flags2) >> 2) & 3;
		mvs = ((psb->flags2) >> 4) & 3;
		data->vidmvs = 1 << mvs;
		data->batps = ((psb->flags2) >> 6) & 3;

705 706 707
		pr_debug("ramp voltage offset: %d\n", data->rvo);
		pr_debug("isochronous relief time: %d\n", data->irt);
		pr_debug("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
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708

709
		pr_debug("numpst: 0x%x\n", psb->num_tables);
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710
		cpst = psb->num_tables;
711 712
		if ((psb->cpuid == 0x00000fc0) ||
		    (psb->cpuid == 0x00000fe0)) {
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			thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
714 715
			if ((thiscpuid == 0x00000fc0) ||
			    (thiscpuid == 0x00000fe0))
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				cpst = 1;
		}
		if (cpst != 1) {
719
			printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
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			return -ENODEV;
		}

		data->plllock = psb->plllocktime;
724 725 726
		pr_debug("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
		pr_debug("maxfid: 0x%x\n", psb->maxfid);
		pr_debug("maxvid: 0x%x\n", psb->maxvid);
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		maxvid = psb->maxvid;

		data->numps = psb->numps;
730
		pr_debug("numpstates: 0x%x\n", data->numps);
731 732
		return fill_powernow_table(data,
				(struct pst_s *)(psb+1), maxvid);
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	}
	/*
	 * If you see this message, complain to BIOS manufacturer. If
	 * he tells you "we do not support Linux" or some similar
	 * nonsense, remember that Windows 2000 uses the same legacy
	 * mechanism that the old Linux PSB driver uses. Tell them it
	 * is broken with Windows 2000.
	 *
	 * The reference to the AMD documentation is chapter 9 in the
	 * BIOS and Kernel Developer's Guide, which is available on
	 * www.amd.com
	 */
745
	printk(KERN_ERR FW_BUG PFX "No PSB or ACPI _PSS objects\n");
746 747
	printk(KERN_ERR PFX "Make sure that your BIOS is up to date"
		" and Cool'N'Quiet support is enabled in BIOS setup\n");
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	return -ENODEV;
}

751 752
static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
		unsigned int index)
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{
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	u64 control;
755

756
	if (!data->acpi_data.state_count)
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		return;

759 760 761 762 763 764 765 766
	control = data->acpi_data.states[index].control;
	data->irt = (control >> IRT_SHIFT) & IRT_MASK;
	data->rvo = (control >> RVO_SHIFT) & RVO_MASK;
	data->exttype = (control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
	data->plllock = (control >> PLL_L_SHIFT) & PLL_L_MASK;
	data->vidmvs = 1 << ((control >> MVS_SHIFT) & MVS_MASK);
	data->vstable = (control >> VST_SHIFT) & VST_MASK;
}
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static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
{
	struct cpufreq_frequency_table *powernow_table;
771
	int ret_val = -ENODEV;
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	u64 control, status;
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774
	if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
775
		pr_debug("register performance failed: bad ACPI data\n");
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		return -EIO;
	}

	/* verify the data contained in the ACPI structures */
780
	if (data->acpi_data.state_count <= 1) {
781
		pr_debug("No ACPI P-States\n");
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		goto err_out;
	}

785 786 787 788 789
	control = data->acpi_data.control_register.space_id;
	status = data->acpi_data.status_register.space_id;

	if ((control != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
	    (status != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
790
		pr_debug("Invalid control/status registers (%llx - %llx)\n",
791
			control, status);
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		goto err_out;
	}

	/* fill in data->powernow_table */
	powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
797
		* (data->acpi_data.state_count + 1)), GFP_KERNEL);
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	if (!powernow_table) {
799
		pr_debug("powernow_table memory alloc failure\n");
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		goto err_out;
	}

803 804 805 806
	/* fill in data */
	data->numps = data->acpi_data.state_count;
	powernow_k8_acpi_pst_values(data, 0);

807
	ret_val = fill_powernow_table_fidvid(data, powernow_table);
808 809 810
	if (ret_val)
		goto err_out_mem;

811 812
	powernow_table[data->acpi_data.state_count].frequency =
		CPUFREQ_TABLE_END;
813
	powernow_table[data->acpi_data.state_count].index = 0;
814 815
	data->powernow_table = powernow_table;

816
	if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
817
		print_basics(data);
818 819 820 821

	/* notify BIOS that we exist */
	acpi_processor_notify_smm(THIS_MODULE);

822
	if (!zalloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) {
823 824 825 826 827 828
		printk(KERN_ERR PFX
				"unable to alloc powernow_k8_data cpumask\n");
		ret_val = -ENOMEM;
		goto err_out_mem;
	}

829 830 831 832 833 834
	return 0;

err_out_mem:
	kfree(powernow_table);

err_out:
835
	acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
836

837 838
	/* data->acpi_data.state_count informs us at ->exit()
	 * whether ACPI was used */
839
	data->acpi_data.state_count = 0;
840

841
	return ret_val;
842 843
}

844 845
static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
		struct cpufreq_frequency_table *powernow_table)
846 847
{
	int i;
848

849
	for (i = 0; i < data->acpi_data.state_count; i++) {
850 851
		u32 fid;
		u32 vid;
852
		u32 freq, index;
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		u64 status, control;
854 855

		if (data->exttype) {
856 857 858
			status =  data->acpi_data.states[i].status;
			fid = status & EXT_FID_MASK;
			vid = (status >> VID_SHIFT) & EXT_VID_MASK;
859
		} else {
860 861 862
			control =  data->acpi_data.states[i].control;
			fid = control & FID_MASK;
			vid = (control >> VID_SHIFT) & VID_MASK;
863
		}
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865
		pr_debug("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
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867 868 869 870 871
		index = fid | (vid<<8);
		powernow_table[i].index = index;

		freq = find_khz_freq_from_fid(fid);
		powernow_table[i].frequency = freq;
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		/* verify frequency is OK */
874
		if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) {
875
			pr_debug("invalid freq %u kHz, ignoring\n", freq);
876
			invalidate_entry(powernow_table, i);
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			continue;
		}

880 881
		/* verify voltage is OK -
		 * BIOSs are using "off" to indicate invalid */
882
		if (vid == VID_OFF) {
883
			pr_debug("invalid vid %u, ignoring\n", vid);
884
			invalidate_entry(powernow_table, i);
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			continue;
		}

888 889 890 891 892 893
		if (freq != (data->acpi_data.states[i].core_frequency * 1000)) {
			printk(KERN_INFO PFX "invalid freq entries "
				"%u kHz vs. %u kHz\n", freq,
				(unsigned int)
				(data->acpi_data.states[i].core_frequency
				 * 1000));
894
			invalidate_entry(powernow_table, i);
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			continue;
		}
	}
	return 0;
}

static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
{
903
	if (data->acpi_data.state_count)
904 905
		acpi_processor_unregister_performance(&data->acpi_data,
				data->cpu);
906
	free_cpumask_var(data->acpi_data.shared_cpu_map);
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}

909 910 911 912 913 914 915 916 917 918
static int get_transition_latency(struct powernow_k8_data *data)
{
	int max_latency = 0;
	int i;
	for (i = 0; i < data->acpi_data.state_count; i++) {
		int cur_latency = data->acpi_data.states[i].transition_latency
			+ data->acpi_data.states[i].bus_master_latency;
		if (cur_latency > max_latency)
			max_latency = cur_latency;
	}
919
	if (max_latency == 0) {
920
		pr_err(FW_WARN PFX "Invalid zero transition latency\n");
921 922
		max_latency = 1;
	}
923 924 925 926
	/* value in usecs, needs to be in nanoseconds */
	return 1000 * max_latency;
}

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/* Take a frequency, and issue the fid/vid transition command */
928 929
static int transition_frequency_fidvid(struct powernow_k8_data *data,
		unsigned int index)
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{
931
	struct cpufreq_policy *policy;
932 933
	u32 fid = 0;
	u32 vid = 0;
934
	int res;
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	struct cpufreq_freqs freqs;

937
	pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index);
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939
	/* fid/vid correctness check for k8 */
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	/* fid are the lower 8 bits of the index we stored into
941 942
	 * the cpufreq frequency table in find_psb_table, vid
	 * are the upper 8 bits.
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	 */
	fid = data->powernow_table[index].index & 0xFF;
	vid = (data->powernow_table[index].index & 0xFF00) >> 8;

947
	pr_debug("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
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	if (query_current_values_with_pending_wait(data))
		return 1;

	if ((data->currvid == vid) && (data->currfid == fid)) {
953
		pr_debug("target matches current values (fid 0x%x, vid 0x%x)\n",
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			fid, vid);
		return 0;
	}

958
	pr_debug("cpu %d, changing to fid 0x%x, vid 0x%x\n",
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		smp_processor_id(), fid, vid);
	freqs.old = find_khz_freq_from_fid(data->currfid);
	freqs.new = find_khz_freq_from_fid(fid);
962

963 964 965 966
	policy = cpufreq_cpu_get(smp_processor_id());
	cpufreq_cpu_put(policy);

	cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
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	res = transition_fid_vid(data, fid, vid);
969 970 971
	if (res)
		return res;

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	freqs.new = find_khz_freq_from_fid(data->currfid);
973

974
	cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
975 976 977
	return res;
}

978 979 980 981 982 983 984
struct powernowk8_target_arg {
	struct cpufreq_policy		*pol;
	unsigned			targfreq;
	unsigned			relation;
};

static long powernowk8_target_fn(void *arg)
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{
986 987 988 989
	struct powernowk8_target_arg *pta = arg;
	struct cpufreq_policy *pol = pta->pol;
	unsigned targfreq = pta->targfreq;
	unsigned relation = pta->relation;
990
	struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
991 992
	u32 checkfid;
	u32 checkvid;
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	unsigned int newstate;
994
	int ret;
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996 997 998
	if (!data)
		return -EINVAL;

999 1000 1001
	checkfid = data->currfid;
	checkvid = data->currvid;

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	if (pending_bit_stuck()) {
		printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1004
		return -EIO;
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	}

1007
	pr_debug("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
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		pol->cpu, targfreq, pol->min, pol->max, relation);

1010
	if (query_current_values_with_pending_wait(data))
1011
		return -EIO;
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1013 1014
	pr_debug("targ: curr fid 0x%x, vid 0x%x\n",
		 data->currfid, data->currvid);
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1016 1017 1018 1019 1020 1021
	if ((checkvid != data->currvid) ||
	    (checkfid != data->currfid)) {
		pr_info(PFX
		       "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
		       checkfid, data->currfid,
		       checkvid, data->currvid);
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	}

1024 1025
	if (cpufreq_frequency_table_target(pol, data->powernow_table,
				targfreq, relation, &newstate))
1026
		return -EIO;
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1028
	mutex_lock(&fidvid_mutex);
D
Dave Jones 已提交
1029

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1030 1031
	powernow_k8_acpi_pst_values(data, newstate);

1032 1033
	ret = transition_frequency_fidvid(data, newstate);

1034
	if (ret) {
L
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1035
		printk(KERN_ERR PFX "transition frequency failed\n");
1036
		mutex_unlock(&fidvid_mutex);
1037
		return 1;
L
Linus Torvalds 已提交
1038
	}
1039
	mutex_unlock(&fidvid_mutex);
D
Dave Jones 已提交
1040

1041
	pol->cur = find_khz_freq_from_fid(data->currfid);
L
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1042

1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
	return 0;
}

/* Driver entry point to switch to the target frequency */
static int powernowk8_target(struct cpufreq_policy *pol,
		unsigned targfreq, unsigned relation)
{
	struct powernowk8_target_arg pta = { .pol = pol, .targfreq = targfreq,
					     .relation = relation };

1053
	return work_on_cpu(pol->cpu, powernowk8_target_fn, &pta);
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1054 1055 1056 1057 1058
}

/* Driver entry point to verify the policy and range of frequencies */
static int powernowk8_verify(struct cpufreq_policy *pol)
{
1059
	struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
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1060

1061 1062 1063
	if (!data)
		return -EINVAL;

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1064 1065 1066
	return cpufreq_frequency_table_verify(pol, data->powernow_table);
}

1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086
struct init_on_cpu {
	struct powernow_k8_data *data;
	int rc;
};

static void __cpuinit powernowk8_cpu_init_on_cpu(void *_init_on_cpu)
{
	struct init_on_cpu *init_on_cpu = _init_on_cpu;

	if (pending_bit_stuck()) {
		printk(KERN_ERR PFX "failing init, change pending bit set\n");
		init_on_cpu->rc = -ENODEV;
		return;
	}

	if (query_current_values_with_pending_wait(init_on_cpu->data)) {
		init_on_cpu->rc = -ENODEV;
		return;
	}

1087
	fidvid_msr_init();
1088 1089 1090 1091

	init_on_cpu->rc = 0;
}

1092 1093 1094 1095 1096 1097
static const char missing_pss_msg[] =
	KERN_ERR
	FW_BUG PFX "No compatible ACPI _PSS objects found.\n"
	FW_BUG PFX "First, make sure Cool'N'Quiet is enabled in the BIOS.\n"
	FW_BUG PFX "If that doesn't help, try upgrading your BIOS.\n";

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1098
/* per CPU init entry point to the driver */
1099
static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
L
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{
	struct powernow_k8_data *data;
1102
	struct init_on_cpu init_on_cpu;
1103
	int rc;
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1104

1105 1106
	smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1);
	if (rc)
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1107 1108
		return -ENODEV;

1109
	data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
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1110 1111 1112 1113 1114 1115 1116
	if (!data) {
		printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
		return -ENOMEM;
	}

	data->cpu = pol->cpu;

1117
	if (powernow_k8_cpu_init_acpi(data)) {
L
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1118
		/*
L
Lucas De Marchi 已提交
1119
		 * Use the PSB BIOS structure. This is only available on
L
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1120 1121
		 * an UP version, and is deprecated by AMD.
		 */
1122
		if (num_online_cpus() != 1) {
1123
			printk_once(missing_pss_msg);
1124
			goto err_out;
L
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1125 1126
		}
		if (pol->cpu != 0) {
1127 1128 1129
			printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
			       "CPU other than CPU0. Complain to your BIOS "
			       "vendor.\n");
1130
			goto err_out;
L
Linus Torvalds 已提交
1131 1132
		}
		rc = find_psb_table(data);
1133 1134 1135
		if (rc)
			goto err_out;

1136 1137 1138 1139 1140 1141 1142
		/* Take a crude guess here.
		 * That guess was in microseconds, so multiply with 1000 */
		pol->cpuinfo.transition_latency = (
			 ((data->rvo + 8) * data->vstable * VST_UNITS_20US) +
			 ((1 << data->irt) * 30)) * 1000;
	} else /* ACPI _PSS objects available */
		pol->cpuinfo.transition_latency = get_transition_latency(data);
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1143 1144

	/* only run on specific CPU from here on */
1145 1146 1147 1148 1149 1150
	init_on_cpu.data = data;
	smp_call_function_single(data->cpu, powernowk8_cpu_init_on_cpu,
				 &init_on_cpu, 1);
	rc = init_on_cpu.rc;
	if (rc != 0)
		goto err_out_exit_acpi;
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1151

1152
	cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu));
1153
	data->available_cores = pol->cpus;
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1154

1155
	pol->cur = find_khz_freq_from_fid(data->currfid);
1156
	pr_debug("policy current frequency %d kHz\n", pol->cur);
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1157 1158 1159

	/* min/max the cpu is capable of */
	if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1160
		printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
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1161 1162 1163 1164 1165 1166 1167 1168
		powernow_k8_cpu_exit_acpi(data);
		kfree(data->powernow_table);
		kfree(data);
		return -EINVAL;
	}

	cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);

1169 1170
	pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n",
		 data->currfid, data->currvid);
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1171

1172
	per_cpu(powernow_data, pol->cpu) = data;
L
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1173 1174 1175

	return 0;

1176
err_out_exit_acpi:
L
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	powernow_k8_cpu_exit_acpi(data);

1179
err_out:
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1180 1181 1182 1183
	kfree(data);
	return -ENODEV;
}

B
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1184
static int powernowk8_cpu_exit(struct cpufreq_policy *pol)
L
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1185
{
1186
	struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
L
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1187 1188 1189 1190 1191 1192 1193 1194 1195 1196

	if (!data)
		return -EINVAL;

	powernow_k8_cpu_exit_acpi(data);

	cpufreq_frequency_table_put_attr(pol->cpu);

	kfree(data->powernow_table);
	kfree(data);
1197
	per_cpu(powernow_data, pol->cpu) = NULL;
L
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1198 1199 1200 1201

	return 0;
}

1202 1203 1204
static void query_values_on_cpu(void *_err)
{
	int *err = _err;
T
Tejun Heo 已提交
1205
	struct powernow_k8_data *data = __this_cpu_read(powernow_data);
1206 1207 1208 1209

	*err = query_current_values_with_pending_wait(data);
}

1210
static unsigned int powernowk8_get(unsigned int cpu)
L
Linus Torvalds 已提交
1211
{
1212
	struct powernow_k8_data *data = per_cpu(powernow_data, cpu);
L
Linus Torvalds 已提交
1213
	unsigned int khz = 0;
1214
	int err;
1215 1216

	if (!data)
1217
		return 0;
1218

1219 1220
	smp_call_function_single(cpu, query_values_on_cpu, &err, true);
	if (err)
L
Linus Torvalds 已提交
1221 1222
		goto out;

1223
	khz = find_khz_freq_from_fid(data->currfid);
1224

L
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1225

1226
out:
L
Linus Torvalds 已提交
1227 1228 1229
	return khz;
}

1230
static struct freq_attr *powernow_k8_attr[] = {
L
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1231 1232 1233 1234
	&cpufreq_freq_attr_scaling_available_freqs,
	NULL,
};

1235
static struct cpufreq_driver cpufreq_amd64_driver = {
1236 1237 1238 1239
	.verify		= powernowk8_verify,
	.target		= powernowk8_target,
	.bios_limit	= acpi_processor_get_bios_limit,
	.init		= powernowk8_cpu_init,
1240
	.exit		= powernowk8_cpu_exit,
1241 1242 1243 1244
	.get		= powernowk8_get,
	.name		= "powernow-k8",
	.owner		= THIS_MODULE,
	.attr		= powernow_k8_attr,
L
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1245 1246
};

1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
static void __request_acpi_cpufreq(void)
{
	const char *cur_drv, *drv = "acpi-cpufreq";

	cur_drv = cpufreq_get_current_driver();
	if (!cur_drv)
		goto request;

	if (strncmp(cur_drv, drv, min_t(size_t, strlen(cur_drv), strlen(drv))))
		pr_warn(PFX "WTF driver: %s\n", cur_drv);

	return;

 request:
	pr_warn(PFX "This CPU is not supported anymore, using acpi-cpufreq instead.\n");
	request_module(drv);
}

L
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1265
/* driver entry point for init */
1266
static int __cpuinit powernowk8_init(void)
L
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1267
{
1268
	unsigned int i, supported_cpus = 0;
1269
	int ret;
L
Linus Torvalds 已提交
1270

1271
	if (static_cpu_has(X86_FEATURE_HW_PSTATE)) {
1272
		__request_acpi_cpufreq();
1273
		return -ENODEV;
1274
	}
1275 1276 1277 1278

	if (!x86_match_cpu(powernow_k8_ids))
		return -ENODEV;

1279
	get_online_cpus();
1280
	for_each_online_cpu(i) {
1281 1282
		smp_call_function_single(i, check_supported_cpu, &ret, 1);
		if (!ret)
L
Linus Torvalds 已提交
1283 1284 1285
			supported_cpus++;
	}

1286 1287
	if (supported_cpus != num_online_cpus()) {
		put_online_cpus();
1288
		return -ENODEV;
1289 1290
	}
	put_online_cpus();
1291

1292 1293 1294
	ret = cpufreq_register_driver(&cpufreq_amd64_driver);
	if (ret)
		return ret;
1295

1296 1297
	pr_info(PFX "Found %d %s (%d cpu cores) (" VERSION ")\n",
		num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus);
1298

1299
	return ret;
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1300 1301 1302 1303 1304
}

/* driver entry point for term */
static void __exit powernowk8_exit(void)
{
1305
	pr_debug("exit\n");
L
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1306 1307 1308 1309

	cpufreq_unregister_driver(&cpufreq_amd64_driver);
}

1310 1311
MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and "
		"Mark Langsdorf <mark.langsdorf@amd.com>");
L
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1312 1313 1314 1315 1316
MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
MODULE_LICENSE("GPL");

late_initcall(powernowk8_init);
module_exit(powernowk8_exit);