710 lines
16 KiB
C
710 lines
16 KiB
C
/*
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* AMD K7 Powernow driver.
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* (C) 2003 Dave Jones on behalf of SuSE Labs.
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* (C) 2003-2004 Dave Jones <davej@redhat.com>
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*
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* Licensed under the terms of the GNU GPL License version 2.
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* Based upon datasheets & sample CPUs kindly provided by AMD.
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*
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* Errata 5:
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* CPU may fail to execute a FID/VID change in presence of interrupt.
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* - We cli/sti on stepping A0 CPUs around the FID/VID transition.
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* Errata 15:
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* CPU with half frequency multipliers may hang upon wakeup from disconnect.
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* - We disable half multipliers if ACPI is used on A0 stepping CPUs.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/cpufreq.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/dmi.h>
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#include <linux/timex.h>
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#include <linux/io.h>
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#include <asm/timer.h> /* Needed for recalibrate_cpu_khz() */
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#include <asm/msr.h>
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#include <asm/cpu_device_id.h>
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#ifdef CONFIG_X86_POWERNOW_K7_ACPI
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#include <linux/acpi.h>
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#include <acpi/processor.h>
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#endif
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#include "powernow-k7.h"
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#define PFX "powernow: "
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struct psb_s {
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u8 signature[10];
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u8 tableversion;
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u8 flags;
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u16 settlingtime;
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u8 reserved1;
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u8 numpst;
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};
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struct pst_s {
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u32 cpuid;
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u8 fsbspeed;
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u8 maxfid;
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u8 startvid;
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u8 numpstates;
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};
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#ifdef CONFIG_X86_POWERNOW_K7_ACPI
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union powernow_acpi_control_t {
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struct {
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unsigned long fid:5,
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vid:5,
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sgtc:20,
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res1:2;
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} bits;
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unsigned long val;
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};
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#endif
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/* divide by 1000 to get VCore voltage in V. */
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static const int mobile_vid_table[32] = {
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2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
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1600, 1550, 1500, 1450, 1400, 1350, 1300, 0,
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1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
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1075, 1050, 1025, 1000, 975, 950, 925, 0,
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};
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/* divide by 10 to get FID. */
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static const int fid_codes[32] = {
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110, 115, 120, 125, 50, 55, 60, 65,
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70, 75, 80, 85, 90, 95, 100, 105,
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30, 190, 40, 200, 130, 135, 140, 210,
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150, 225, 160, 165, 170, 180, -1, -1,
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};
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/* This parameter is used in order to force ACPI instead of legacy method for
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* configuration purpose.
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*/
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static int acpi_force;
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static struct cpufreq_frequency_table *powernow_table;
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static unsigned int can_scale_bus;
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static unsigned int can_scale_vid;
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static unsigned int minimum_speed = -1;
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static unsigned int maximum_speed;
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static unsigned int number_scales;
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static unsigned int fsb;
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static unsigned int latency;
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static char have_a0;
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static int check_fsb(unsigned int fsbspeed)
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{
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int delta;
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unsigned int f = fsb / 1000;
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delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed;
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return delta < 5;
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}
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static const struct x86_cpu_id powernow_k7_cpuids[] = {
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{ X86_VENDOR_AMD, 6, },
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, powernow_k7_cpuids);
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static int check_powernow(void)
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{
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struct cpuinfo_x86 *c = &cpu_data(0);
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unsigned int maxei, eax, ebx, ecx, edx;
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if (!x86_match_cpu(powernow_k7_cpuids))
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return 0;
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/* Get maximum capabilities */
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maxei = cpuid_eax(0x80000000);
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if (maxei < 0x80000007) { /* Any powernow info ? */
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#ifdef MODULE
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printk(KERN_INFO PFX "No powernow capabilities detected\n");
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#endif
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return 0;
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}
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if ((c->x86_model == 6) && (c->x86_mask == 0)) {
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printk(KERN_INFO PFX "K7 660[A0] core detected, "
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"enabling errata workarounds\n");
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have_a0 = 1;
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}
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cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
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/* Check we can actually do something before we say anything.*/
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if (!(edx & (1 << 1 | 1 << 2)))
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return 0;
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printk(KERN_INFO PFX "PowerNOW! Technology present. Can scale: ");
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if (edx & 1 << 1) {
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printk("frequency");
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can_scale_bus = 1;
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}
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if ((edx & (1 << 1 | 1 << 2)) == 0x6)
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printk(" and ");
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if (edx & 1 << 2) {
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printk("voltage");
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can_scale_vid = 1;
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}
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printk(".\n");
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return 1;
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}
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#ifdef CONFIG_X86_POWERNOW_K7_ACPI
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static void invalidate_entry(unsigned int entry)
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{
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powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
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}
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#endif
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static int get_ranges(unsigned char *pst)
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{
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unsigned int j;
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unsigned int speed;
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u8 fid, vid;
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powernow_table = kzalloc((sizeof(*powernow_table) *
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(number_scales + 1)), GFP_KERNEL);
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if (!powernow_table)
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return -ENOMEM;
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for (j = 0 ; j < number_scales; j++) {
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fid = *pst++;
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powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10;
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powernow_table[j].driver_data = fid; /* lower 8 bits */
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speed = powernow_table[j].frequency;
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if ((fid_codes[fid] % 10) == 5) {
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#ifdef CONFIG_X86_POWERNOW_K7_ACPI
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if (have_a0 == 1)
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invalidate_entry(j);
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#endif
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}
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if (speed < minimum_speed)
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minimum_speed = speed;
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if (speed > maximum_speed)
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maximum_speed = speed;
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vid = *pst++;
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powernow_table[j].driver_data |= (vid << 8); /* upper 8 bits */
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pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) "
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"VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
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fid_codes[fid] % 10, speed/1000, vid,
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mobile_vid_table[vid]/1000,
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mobile_vid_table[vid]%1000);
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}
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powernow_table[number_scales].frequency = CPUFREQ_TABLE_END;
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powernow_table[number_scales].driver_data = 0;
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return 0;
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}
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static void change_FID(int fid)
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{
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union msr_fidvidctl fidvidctl;
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rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
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if (fidvidctl.bits.FID != fid) {
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fidvidctl.bits.SGTC = latency;
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fidvidctl.bits.FID = fid;
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fidvidctl.bits.VIDC = 0;
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fidvidctl.bits.FIDC = 1;
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wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
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}
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}
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static void change_VID(int vid)
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{
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union msr_fidvidctl fidvidctl;
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rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
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if (fidvidctl.bits.VID != vid) {
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fidvidctl.bits.SGTC = latency;
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fidvidctl.bits.VID = vid;
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fidvidctl.bits.FIDC = 0;
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fidvidctl.bits.VIDC = 1;
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wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
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}
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}
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static int powernow_target(struct cpufreq_policy *policy, unsigned int index)
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{
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u8 fid, vid;
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struct cpufreq_freqs freqs;
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union msr_fidvidstatus fidvidstatus;
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int cfid;
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/* fid are the lower 8 bits of the index we stored into
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* the cpufreq frequency table in powernow_decode_bios,
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* vid are the upper 8 bits.
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*/
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fid = powernow_table[index].driver_data & 0xFF;
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vid = (powernow_table[index].driver_data & 0xFF00) >> 8;
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rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
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cfid = fidvidstatus.bits.CFID;
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freqs.old = fsb * fid_codes[cfid] / 10;
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freqs.new = powernow_table[index].frequency;
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/* Now do the magic poking into the MSRs. */
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if (have_a0 == 1) /* A0 errata 5 */
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local_irq_disable();
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if (freqs.old > freqs.new) {
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/* Going down, so change FID first */
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change_FID(fid);
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change_VID(vid);
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} else {
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/* Going up, so change VID first */
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change_VID(vid);
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change_FID(fid);
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}
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if (have_a0 == 1)
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local_irq_enable();
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return 0;
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}
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#ifdef CONFIG_X86_POWERNOW_K7_ACPI
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static struct acpi_processor_performance *acpi_processor_perf;
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static int powernow_acpi_init(void)
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{
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int i;
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int retval = 0;
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union powernow_acpi_control_t pc;
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if (acpi_processor_perf != NULL && powernow_table != NULL) {
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retval = -EINVAL;
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goto err0;
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}
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acpi_processor_perf = kzalloc(sizeof(*acpi_processor_perf), GFP_KERNEL);
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if (!acpi_processor_perf) {
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retval = -ENOMEM;
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goto err0;
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}
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if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map,
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GFP_KERNEL)) {
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retval = -ENOMEM;
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goto err05;
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}
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if (acpi_processor_register_performance(acpi_processor_perf, 0)) {
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retval = -EIO;
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goto err1;
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}
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if (acpi_processor_perf->control_register.space_id !=
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ACPI_ADR_SPACE_FIXED_HARDWARE) {
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retval = -ENODEV;
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goto err2;
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}
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if (acpi_processor_perf->status_register.space_id !=
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ACPI_ADR_SPACE_FIXED_HARDWARE) {
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retval = -ENODEV;
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goto err2;
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}
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number_scales = acpi_processor_perf->state_count;
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if (number_scales < 2) {
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retval = -ENODEV;
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goto err2;
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}
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powernow_table = kzalloc((sizeof(*powernow_table) *
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(number_scales + 1)), GFP_KERNEL);
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if (!powernow_table) {
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retval = -ENOMEM;
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goto err2;
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}
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pc.val = (unsigned long) acpi_processor_perf->states[0].control;
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for (i = 0; i < number_scales; i++) {
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u8 fid, vid;
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struct acpi_processor_px *state =
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&acpi_processor_perf->states[i];
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unsigned int speed, speed_mhz;
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pc.val = (unsigned long) state->control;
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pr_debug("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n",
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i,
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(u32) state->core_frequency,
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(u32) state->power,
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(u32) state->transition_latency,
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(u32) state->control,
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pc.bits.sgtc);
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vid = pc.bits.vid;
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fid = pc.bits.fid;
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powernow_table[i].frequency = fsb * fid_codes[fid] / 10;
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powernow_table[i].driver_data = fid; /* lower 8 bits */
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powernow_table[i].driver_data |= (vid << 8); /* upper 8 bits */
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speed = powernow_table[i].frequency;
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speed_mhz = speed / 1000;
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/* processor_perflib will multiply the MHz value by 1000 to
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* get a KHz value (e.g. 1266000). However, powernow-k7 works
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* with true KHz values (e.g. 1266768). To ensure that all
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* powernow frequencies are available, we must ensure that
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* ACPI doesn't restrict them, so we round up the MHz value
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* to ensure that perflib's computed KHz value is greater than
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* or equal to powernow's KHz value.
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*/
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if (speed % 1000 > 0)
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speed_mhz++;
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if ((fid_codes[fid] % 10) == 5) {
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if (have_a0 == 1)
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invalidate_entry(i);
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}
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pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) "
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"VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
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fid_codes[fid] % 10, speed_mhz, vid,
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mobile_vid_table[vid]/1000,
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mobile_vid_table[vid]%1000);
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if (state->core_frequency != speed_mhz) {
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state->core_frequency = speed_mhz;
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pr_debug(" Corrected ACPI frequency to %d\n",
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speed_mhz);
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}
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if (latency < pc.bits.sgtc)
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latency = pc.bits.sgtc;
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if (speed < minimum_speed)
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minimum_speed = speed;
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if (speed > maximum_speed)
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maximum_speed = speed;
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}
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powernow_table[i].frequency = CPUFREQ_TABLE_END;
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powernow_table[i].driver_data = 0;
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/* notify BIOS that we exist */
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acpi_processor_notify_smm(THIS_MODULE);
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return 0;
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err2:
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acpi_processor_unregister_performance(acpi_processor_perf, 0);
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err1:
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free_cpumask_var(acpi_processor_perf->shared_cpu_map);
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err05:
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kfree(acpi_processor_perf);
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err0:
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printk(KERN_WARNING PFX "ACPI perflib can not be used on "
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"this platform\n");
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acpi_processor_perf = NULL;
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return retval;
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}
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#else
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static int powernow_acpi_init(void)
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{
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printk(KERN_INFO PFX "no support for ACPI processor found."
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" Please recompile your kernel with ACPI processor\n");
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return -EINVAL;
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}
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#endif
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static void print_pst_entry(struct pst_s *pst, unsigned int j)
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{
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pr_debug("PST:%d (@%p)\n", j, pst);
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pr_debug(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n",
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pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid);
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}
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static int powernow_decode_bios(int maxfid, int startvid)
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{
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struct psb_s *psb;
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struct pst_s *pst;
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unsigned int i, j;
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unsigned char *p;
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unsigned int etuple;
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unsigned int ret;
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etuple = cpuid_eax(0x80000001);
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for (i = 0xC0000; i < 0xffff0 ; i += 16) {
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p = phys_to_virt(i);
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if (memcmp(p, "AMDK7PNOW!", 10) == 0) {
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pr_debug("Found PSB header at %p\n", p);
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psb = (struct psb_s *) p;
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pr_debug("Table version: 0x%x\n", psb->tableversion);
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if (psb->tableversion != 0x12) {
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printk(KERN_INFO PFX "Sorry, only v1.2 tables"
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" supported right now\n");
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return -ENODEV;
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}
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pr_debug("Flags: 0x%x\n", psb->flags);
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if ((psb->flags & 1) == 0)
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pr_debug("Mobile voltage regulator\n");
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else
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pr_debug("Desktop voltage regulator\n");
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latency = psb->settlingtime;
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if (latency < 100) {
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printk(KERN_INFO PFX "BIOS set settling time "
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"to %d microseconds. "
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"Should be at least 100. "
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"Correcting.\n", latency);
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latency = 100;
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}
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pr_debug("Settling Time: %d microseconds.\n",
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psb->settlingtime);
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pr_debug("Has %d PST tables. (Only dumping ones "
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"relevant to this CPU).\n",
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psb->numpst);
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p += sizeof(*psb);
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pst = (struct pst_s *) p;
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for (j = 0; j < psb->numpst; j++) {
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pst = (struct pst_s *) p;
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number_scales = pst->numpstates;
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if ((etuple == pst->cpuid) &&
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check_fsb(pst->fsbspeed) &&
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(maxfid == pst->maxfid) &&
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(startvid == pst->startvid)) {
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print_pst_entry(pst, j);
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p = (char *)pst + sizeof(*pst);
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ret = get_ranges(p);
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return ret;
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} else {
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unsigned int k;
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p = (char *)pst + sizeof(*pst);
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for (k = 0; k < number_scales; k++)
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p += 2;
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}
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}
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printk(KERN_INFO PFX "No PST tables match this cpuid "
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"(0x%x)\n", etuple);
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printk(KERN_INFO PFX "This is indicative of a broken "
|
|
"BIOS.\n");
|
|
|
|
return -EINVAL;
|
|
}
|
|
p++;
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
|
|
/*
|
|
* We use the fact that the bus frequency is somehow
|
|
* a multiple of 100000/3 khz, then we compute sgtc according
|
|
* to this multiple.
|
|
* That way, we match more how AMD thinks all of that work.
|
|
* We will then get the same kind of behaviour already tested under
|
|
* the "well-known" other OS.
|
|
*/
|
|
static int fixup_sgtc(void)
|
|
{
|
|
unsigned int sgtc;
|
|
unsigned int m;
|
|
|
|
m = fsb / 3333;
|
|
if ((m % 10) >= 5)
|
|
m += 5;
|
|
|
|
m /= 10;
|
|
|
|
sgtc = 100 * m * latency;
|
|
sgtc = sgtc / 3;
|
|
if (sgtc > 0xfffff) {
|
|
printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc);
|
|
sgtc = 0xfffff;
|
|
}
|
|
return sgtc;
|
|
}
|
|
|
|
static unsigned int powernow_get(unsigned int cpu)
|
|
{
|
|
union msr_fidvidstatus fidvidstatus;
|
|
unsigned int cfid;
|
|
|
|
if (cpu)
|
|
return 0;
|
|
rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
|
|
cfid = fidvidstatus.bits.CFID;
|
|
|
|
return fsb * fid_codes[cfid] / 10;
|
|
}
|
|
|
|
|
|
static int acer_cpufreq_pst(const struct dmi_system_id *d)
|
|
{
|
|
printk(KERN_WARNING PFX
|
|
"%s laptop with broken PST tables in BIOS detected.\n",
|
|
d->ident);
|
|
printk(KERN_WARNING PFX
|
|
"You need to downgrade to 3A21 (09/09/2002), or try a newer "
|
|
"BIOS than 3A71 (01/20/2003)\n");
|
|
printk(KERN_WARNING PFX
|
|
"cpufreq scaling has been disabled as a result of this.\n");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Some Athlon laptops have really fucked PST tables.
|
|
* A BIOS update is all that can save them.
|
|
* Mention this, and disable cpufreq.
|
|
*/
|
|
static struct dmi_system_id powernow_dmi_table[] = {
|
|
{
|
|
.callback = acer_cpufreq_pst,
|
|
.ident = "Acer Aspire",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"),
|
|
DMI_MATCH(DMI_BIOS_VERSION, "3A71"),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int powernow_cpu_init(struct cpufreq_policy *policy)
|
|
{
|
|
union msr_fidvidstatus fidvidstatus;
|
|
int result;
|
|
|
|
if (policy->cpu != 0)
|
|
return -ENODEV;
|
|
|
|
rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
|
|
|
|
recalibrate_cpu_khz();
|
|
|
|
fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID];
|
|
if (!fsb) {
|
|
printk(KERN_WARNING PFX "can not determine bus frequency\n");
|
|
return -EINVAL;
|
|
}
|
|
pr_debug("FSB: %3dMHz\n", fsb/1000);
|
|
|
|
if (dmi_check_system(powernow_dmi_table) || acpi_force) {
|
|
printk(KERN_INFO PFX "PSB/PST known to be broken. "
|
|
"Trying ACPI instead\n");
|
|
result = powernow_acpi_init();
|
|
} else {
|
|
result = powernow_decode_bios(fidvidstatus.bits.MFID,
|
|
fidvidstatus.bits.SVID);
|
|
if (result) {
|
|
printk(KERN_INFO PFX "Trying ACPI perflib\n");
|
|
maximum_speed = 0;
|
|
minimum_speed = -1;
|
|
latency = 0;
|
|
result = powernow_acpi_init();
|
|
if (result) {
|
|
printk(KERN_INFO PFX
|
|
"ACPI and legacy methods failed\n");
|
|
}
|
|
} else {
|
|
/* SGTC use the bus clock as timer */
|
|
latency = fixup_sgtc();
|
|
printk(KERN_INFO PFX "SGTC: %d\n", latency);
|
|
}
|
|
}
|
|
|
|
if (result)
|
|
return result;
|
|
|
|
printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n",
|
|
minimum_speed/1000, maximum_speed/1000);
|
|
|
|
policy->cpuinfo.transition_latency =
|
|
cpufreq_scale(2000000UL, fsb, latency);
|
|
|
|
return cpufreq_table_validate_and_show(policy, powernow_table);
|
|
}
|
|
|
|
static int powernow_cpu_exit(struct cpufreq_policy *policy)
|
|
{
|
|
#ifdef CONFIG_X86_POWERNOW_K7_ACPI
|
|
if (acpi_processor_perf) {
|
|
acpi_processor_unregister_performance(acpi_processor_perf, 0);
|
|
free_cpumask_var(acpi_processor_perf->shared_cpu_map);
|
|
kfree(acpi_processor_perf);
|
|
}
|
|
#endif
|
|
|
|
kfree(powernow_table);
|
|
return 0;
|
|
}
|
|
|
|
static struct cpufreq_driver powernow_driver = {
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
|
.target_index = powernow_target,
|
|
.get = powernow_get,
|
|
#ifdef CONFIG_X86_POWERNOW_K7_ACPI
|
|
.bios_limit = acpi_processor_get_bios_limit,
|
|
#endif
|
|
.init = powernow_cpu_init,
|
|
.exit = powernow_cpu_exit,
|
|
.name = "powernow-k7",
|
|
.attr = cpufreq_generic_attr,
|
|
};
|
|
|
|
static int __init powernow_init(void)
|
|
{
|
|
if (check_powernow() == 0)
|
|
return -ENODEV;
|
|
return cpufreq_register_driver(&powernow_driver);
|
|
}
|
|
|
|
|
|
static void __exit powernow_exit(void)
|
|
{
|
|
cpufreq_unregister_driver(&powernow_driver);
|
|
}
|
|
|
|
module_param(acpi_force, int, 0444);
|
|
MODULE_PARM_DESC(acpi_force, "Force ACPI to be used.");
|
|
|
|
MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
|
|
MODULE_DESCRIPTION("Powernow driver for AMD K7 processors.");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
late_initcall(powernow_init);
|
|
module_exit(powernow_exit);
|
|
|