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drivers/cpufreq/powernow-k7.c
17.1 KB
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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> * * Licensed under the terms of the GNU GPL License version 2. * Based upon datasheets & sample CPUs kindly provided by AMD. * |
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* Errata 5: * CPU may fail to execute a FID/VID change in presence of interrupt. * - We cli/sti on stepping A0 CPUs around the FID/VID transition. * Errata 15: * CPU with half frequency multipliers may hang upon wakeup from disconnect. * - We disable half multipliers if ACPI is used on A0 stepping CPUs. |
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*/ |
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#include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/cpufreq.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/dmi.h> |
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#include <linux/timex.h> #include <linux/io.h> |
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|
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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/system.h> #ifdef CONFIG_X86_POWERNOW_K7_ACPI #include <linux/acpi.h> #include <acpi/processor.h> #endif #include "powernow-k7.h" #define PFX "powernow: " struct psb_s { u8 signature[10]; u8 tableversion; u8 flags; u16 settlingtime; u8 reserved1; u8 numpst; }; struct pst_s { u32 cpuid; u8 fsbspeed; u8 maxfid; u8 startvid; u8 numpstates; }; #ifdef CONFIG_X86_POWERNOW_K7_ACPI union powernow_acpi_control_t { struct { unsigned long fid:5, |
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vid:5, sgtc:20, res1:2; |
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} bits; unsigned long val; }; #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, 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, 1075, 1050, 1025, 1000, 975, 950, 925, 0, }; |
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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, 70, 75, 80, 85, 90, 95, 100, 105, 30, 190, 40, 200, 130, 135, 140, 210, 150, 225, 160, 165, 170, 180, -1, -1, }; /* This parameter is used in order to force ACPI instead of legacy method for * configuration purpose. */ static int acpi_force; static struct cpufreq_frequency_table *powernow_table; static unsigned int can_scale_bus; 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; static unsigned int number_scales; static unsigned int fsb; static unsigned int latency; static char have_a0; |
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static int check_fsb(unsigned int fsbspeed) { int delta; unsigned int f = fsb / 1000; delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; |
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return delta < 5; |
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} static int check_powernow(void) { |
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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 ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 != 6)) { |
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#ifdef MODULE |
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printk(KERN_INFO PFX "This module only works with " "AMD K7 CPUs "); |
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#endif return 0; } /* Get maximum capabilities */ |
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maxei = cpuid_eax(0x80000000); |
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if (maxei < 0x80000007) { /* Any powernow info ? */ #ifdef MODULE |
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printk(KERN_INFO PFX "No powernow capabilities detected "); |
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#endif return 0; } if ((c->x86_model == 6) && (c->x86_mask == 0)) { |
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printk(KERN_INFO PFX "K7 660[A0] core detected, " "enabling errata workarounds "); |
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have_a0 = 1; } cpuid(0x80000007, &eax, &ebx, &ecx, &edx); /* Check we can actually do something before we say anything.*/ if (!(edx & (1 << 1 | 1 << 2))) 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"); can_scale_bus = 1; |
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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"); can_scale_vid = 1; |
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} |
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printk(". "); |
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return 1; } |
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#ifdef CONFIG_X86_POWERNOW_K7_ACPI |
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static void invalidate_entry(unsigned int entry) { powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; } |
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#endif |
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|
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static int get_ranges(unsigned char *pst) |
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{ unsigned int j; unsigned int speed; u8 fid, vid; |
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powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL); |
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if (!powernow_table) return -ENOMEM; |
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|
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for (j = 0 ; j < number_scales; j++) { |
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fid = *pst++; powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; powernow_table[j].index = fid; /* lower 8 bits */ 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 if (have_a0 == 1) |
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invalidate_entry(j); |
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#endif } if (speed < minimum_speed) minimum_speed = speed; if (speed > maximum_speed) maximum_speed = speed; vid = *pst++; powernow_table[j].index |= (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) ", fid, fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000, vid, |
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mobile_vid_table[vid]/1000, mobile_vid_table[vid]%1000); } powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; powernow_table[number_scales].index = 0; return 0; } static void change_FID(int fid) { 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) { fidvidctl.bits.SGTC = latency; fidvidctl.bits.FID = fid; fidvidctl.bits.VIDC = 0; fidvidctl.bits.FIDC = 1; |
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wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
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} } static void change_VID(int vid) { 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) { fidvidctl.bits.SGTC = latency; fidvidctl.bits.VID = vid; fidvidctl.bits.FIDC = 0; fidvidctl.bits.VIDC = 1; |
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wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
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} } |
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static void change_speed(unsigned int index) |
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{ u8 fid, vid; struct cpufreq_freqs freqs; union msr_fidvidstatus fidvidstatus; int cfid; /* fid are the lower 8 bits of the index we stored into * the cpufreq frequency table in powernow_decode_bios, * vid are the upper 8 bits. */ fid = powernow_table[index].index & 0xFF; vid = (powernow_table[index].index & 0xFF00) >> 8; freqs.cpu = 0; |
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rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
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cfid = fidvidstatus.bits.CFID; freqs.old = fsb * fid_codes[cfid] / 10; freqs.new = powernow_table[index].frequency; cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); /* Now do the magic poking into the MSRs. */ if (have_a0 == 1) /* A0 errata 5 */ local_irq_disable(); if (freqs.old > freqs.new) { /* Going down, so change FID first */ change_FID(fid); change_VID(vid); } else { /* Going up, so change VID first */ change_VID(vid); change_FID(fid); } if (have_a0 == 1) local_irq_enable(); cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); } #ifdef CONFIG_X86_POWERNOW_K7_ACPI static struct acpi_processor_performance *acpi_processor_perf; static int powernow_acpi_init(void) { int i; int retval = 0; union powernow_acpi_control_t pc; if (acpi_processor_perf != NULL && powernow_table != NULL) { retval = -EINVAL; goto err0; } |
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acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance), |
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GFP_KERNEL); |
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if (!acpi_processor_perf) { retval = -ENOMEM; goto err0; } |
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if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
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GFP_KERNEL)) { retval = -ENOMEM; goto err05; } |
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if (acpi_processor_register_performance(acpi_processor_perf, 0)) { retval = -EIO; goto err1; } |
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if (acpi_processor_perf->control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) { |
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retval = -ENODEV; goto err2; } |
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if (acpi_processor_perf->status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) { |
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retval = -ENODEV; goto err2; } number_scales = acpi_processor_perf->state_count; if (number_scales < 2) { retval = -ENODEV; goto err2; } |
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powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL); |
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if (!powernow_table) { retval = -ENOMEM; goto err2; } |
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pc.val = (unsigned long) acpi_processor_perf->states[0].control; for (i = 0; i < number_scales; i++) { u8 fid, vid; |
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struct acpi_processor_px *state = &acpi_processor_perf->states[i]; unsigned int speed, speed_mhz; |
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|
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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 ", |
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i, |
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(u32) state->core_frequency, (u32) state->power, (u32) state->transition_latency, (u32) state->control, |
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pc.bits.sgtc); vid = pc.bits.vid; fid = pc.bits.fid; powernow_table[i].frequency = fsb * fid_codes[fid] / 10; powernow_table[i].index = fid; /* lower 8 bits */ powernow_table[i].index |= (vid << 8); /* upper 8 bits */ speed = powernow_table[i].frequency; |
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speed_mhz = speed / 1000; /* processor_perflib will multiply the MHz value by 1000 to * get a KHz value (e.g. 1266000). However, powernow-k7 works * with true KHz values (e.g. 1266768). To ensure that all * powernow frequencies are available, we must ensure that * ACPI doesn't restrict them, so we round up the MHz value * to ensure that perflib's computed KHz value is greater than * or equal to powernow's KHz value. */ if (speed % 1000 > 0) speed_mhz++; |
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|
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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) ", 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, mobile_vid_table[vid]%1000); |
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if (state->core_frequency != speed_mhz) { state->core_frequency = speed_mhz; |
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pr_debug(" Corrected ACPI frequency to %d ", |
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speed_mhz); } |
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if (latency < pc.bits.sgtc) latency = pc.bits.sgtc; if (speed < minimum_speed) minimum_speed = speed; if (speed > maximum_speed) maximum_speed = speed; } powernow_table[i].frequency = CPUFREQ_TABLE_END; powernow_table[i].index = 0; /* notify BIOS that we exist */ acpi_processor_notify_smm(THIS_MODULE); return 0; err2: acpi_processor_unregister_performance(acpi_processor_perf, 0); err1: |
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free_cpumask_var(acpi_processor_perf->shared_cpu_map); err05: |
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kfree(acpi_processor_perf); err0: |
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printk(KERN_WARNING PFX "ACPI perflib can not be used on " "this platform "); |
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acpi_processor_perf = NULL; return retval; } #else static int powernow_acpi_init(void) { printk(KERN_INFO PFX "no support for ACPI processor found." " Please recompile your kernel with ACPI processor "); return -EINVAL; } #endif |
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static void print_pst_entry(struct pst_s *pst, unsigned int j) { |
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pr_debug("PST:%d (@%p) ", j, pst); pr_debug(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x ", |
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pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); } static int powernow_decode_bios(int maxfid, int startvid) |
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{ struct psb_s *psb; struct pst_s *pst; unsigned int i, j; unsigned char *p; unsigned int etuple; unsigned int ret; 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 ", p); |
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psb = (struct psb_s *) p; |
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pr_debug("Table version: 0x%x ", psb->tableversion); |
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if (psb->tableversion != 0x12) { |
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printk(KERN_INFO PFX "Sorry, only v1.2 tables" " supported right now "); |
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return -ENODEV; } |
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pr_debug("Flags: 0x%x ", psb->flags); |
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if ((psb->flags & 1) == 0) |
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pr_debug("Mobile voltage regulator "); |
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else |
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pr_debug("Desktop voltage regulator "); |
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latency = psb->settlingtime; if (latency < 100) { |
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printk(KERN_INFO PFX "BIOS set settling time " "to %d microseconds. " "Should be at least 100. " "Correcting. ", latency); |
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latency = 100; } |
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pr_debug("Settling Time: %d microseconds. ", |
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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). ", psb->numpst); |
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|
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p += sizeof(struct psb_s); |
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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; number_scales = pst->numpstates; |
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if ((etuple == pst->cpuid) && check_fsb(pst->fsbspeed) && (maxfid == pst->maxfid) && (startvid == pst->startvid)) { print_pst_entry(pst, j); p = (char *)pst + sizeof(struct pst_s); ret = get_ranges(p); |
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return ret; |
1da177e4c Linux-2.6.12-rc2 |
507 |
} else { |
8cbe01690 [CPUFREQ] Disambi... |
508 |
unsigned int k; |
b9e7638a3 [CPUFREQ] checkpa... |
509 510 511 |
p = (char *)pst + sizeof(struct pst_s); for (k = 0; k < number_scales; k++) p += 2; |
1da177e4c Linux-2.6.12-rc2 |
512 513 |
} } |
b9e7638a3 [CPUFREQ] checkpa... |
514 515 516 517 518 519 |
printk(KERN_INFO PFX "No PST tables match this cpuid " "(0x%x) ", etuple); printk(KERN_INFO PFX "This is indicative of a broken " "BIOS. "); |
1da177e4c Linux-2.6.12-rc2 |
520 521 522 523 524 525 526 527 |
return -EINVAL; } p++; } return -ENODEV; } |
b9e7638a3 [CPUFREQ] checkpa... |
528 |
static int powernow_target(struct cpufreq_policy *policy, |
1da177e4c Linux-2.6.12-rc2 |
529 530 531 532 |
unsigned int target_freq, unsigned int relation) { unsigned int newstate; |
b9e7638a3 [CPUFREQ] checkpa... |
533 534 |
if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, relation, &newstate)) |
1da177e4c Linux-2.6.12-rc2 |
535 536 537 538 539 540 |
return -EINVAL; change_speed(newstate); return 0; } |
b9e7638a3 [CPUFREQ] checkpa... |
541 |
static int powernow_verify(struct cpufreq_policy *policy) |
1da177e4c Linux-2.6.12-rc2 |
542 543 544 545 546 547 548 549 550 551 552 553 |
{ return cpufreq_frequency_table_verify(policy, powernow_table); } /* * 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. */ |
307069cf6 [CPUFREQ] Fix sec... |
554 |
static int __cpuinit fixup_sgtc(void) |
1da177e4c Linux-2.6.12-rc2 |
555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 |
{ 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 ", sgtc); sgtc = 0xfffff; } return sgtc; } static unsigned int powernow_get(unsigned int cpu) { union msr_fidvidstatus fidvidstatus; unsigned int cfid; if (cpu) return 0; |
b9e7638a3 [CPUFREQ] checkpa... |
582 |
rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4c Linux-2.6.12-rc2 |
583 |
cfid = fidvidstatus.bits.CFID; |
b9e7638a3 [CPUFREQ] checkpa... |
584 |
return fsb * fid_codes[cfid] / 10; |
1da177e4c Linux-2.6.12-rc2 |
585 |
} |
307069cf6 [CPUFREQ] Fix sec... |
586 |
static int __cpuinit acer_cpufreq_pst(const struct dmi_system_id *d) |
1da177e4c Linux-2.6.12-rc2 |
587 |
{ |
b9e7638a3 [CPUFREQ] checkpa... |
588 589 590 591 592 593 594 595 596 597 598 |
printk(KERN_WARNING PFX "%s laptop with broken PST tables in BIOS detected. ", 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) "); printk(KERN_WARNING PFX "cpufreq scaling has been disabled as a result of this. "); |
1da177e4c Linux-2.6.12-rc2 |
599 600 601 602 603 604 605 606 |
return 0; } /* * Some Athlon laptops have really fucked PST tables. * A BIOS update is all that can save them. * Mention this, and disable cpufreq. */ |
307069cf6 [CPUFREQ] Fix sec... |
607 |
static struct dmi_system_id __cpuinitdata powernow_dmi_table[] = { |
1da177e4c Linux-2.6.12-rc2 |
608 609 610 611 612 613 614 615 616 617 |
{ .callback = acer_cpufreq_pst, .ident = "Acer Aspire", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), DMI_MATCH(DMI_BIOS_VERSION, "3A71"), }, }, { } }; |
307069cf6 [CPUFREQ] Fix sec... |
618 |
static int __cpuinit powernow_cpu_init(struct cpufreq_policy *policy) |
1da177e4c Linux-2.6.12-rc2 |
619 620 621 622 623 624 |
{ union msr_fidvidstatus fidvidstatus; int result; if (policy->cpu != 0) return -ENODEV; |
b9e7638a3 [CPUFREQ] checkpa... |
625 |
rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4c Linux-2.6.12-rc2 |
626 |
|
436fe7b8b [CPUFREQ] Make po... |
627 |
recalibrate_cpu_khz(); |
91350ed49 [CPUFREQ] Recalib... |
628 629 |
fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; |
1da177e4c Linux-2.6.12-rc2 |
630 631 632 633 634 |
if (!fsb) { printk(KERN_WARNING PFX "can not determine bus frequency "); return -EINVAL; } |
2d06d8c49 [CPUFREQ] use dyn... |
635 636 |
pr_debug("FSB: %3dMHz ", fsb/1000); |
1da177e4c Linux-2.6.12-rc2 |
637 638 |
if (dmi_check_system(powernow_dmi_table) || acpi_force) { |
b9e7638a3 [CPUFREQ] checkpa... |
639 640 641 |
printk(KERN_INFO PFX "PSB/PST known to be broken. " "Trying ACPI instead "); |
1da177e4c Linux-2.6.12-rc2 |
642 643 |
result = powernow_acpi_init(); } else { |
b9e7638a3 [CPUFREQ] checkpa... |
644 645 |
result = powernow_decode_bios(fidvidstatus.bits.MFID, fidvidstatus.bits.SVID); |
1da177e4c Linux-2.6.12-rc2 |
646 |
if (result) { |
b9e7638a3 [CPUFREQ] checkpa... |
647 648 |
printk(KERN_INFO PFX "Trying ACPI perflib "); |
1da177e4c Linux-2.6.12-rc2 |
649 650 651 652 653 |
maximum_speed = 0; minimum_speed = -1; latency = 0; result = powernow_acpi_init(); if (result) { |
b9e7638a3 [CPUFREQ] checkpa... |
654 655 656 |
printk(KERN_INFO PFX "ACPI and legacy methods failed "); |
1da177e4c Linux-2.6.12-rc2 |
657 658 659 660 661 662 663 664 665 666 667 |
} } else { /* SGTC use the bus clock as timer */ latency = fixup_sgtc(); printk(KERN_INFO PFX "SGTC: %d ", latency); } } if (result) return result; |
b9e7638a3 [CPUFREQ] checkpa... |
668 669 |
printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz. ", |
1da177e4c Linux-2.6.12-rc2 |
670 |
minimum_speed/1000, maximum_speed/1000); |
b9e7638a3 [CPUFREQ] checkpa... |
671 672 |
policy->cpuinfo.transition_latency = cpufreq_scale(2000000UL, fsb, latency); |
1da177e4c Linux-2.6.12-rc2 |
673 674 675 676 677 678 679 |
policy->cur = powernow_get(0); cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); return cpufreq_frequency_table_cpuinfo(policy, powernow_table); } |
b9e7638a3 [CPUFREQ] checkpa... |
680 681 |
static int powernow_cpu_exit(struct cpufreq_policy *policy) { |
1da177e4c Linux-2.6.12-rc2 |
682 683 684 685 686 |
cpufreq_frequency_table_put_attr(policy->cpu); #ifdef CONFIG_X86_POWERNOW_K7_ACPI if (acpi_processor_perf) { acpi_processor_unregister_performance(acpi_processor_perf, 0); |
2fdf66b49 cpumask: convert ... |
687 |
free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
1da177e4c Linux-2.6.12-rc2 |
688 689 690 |
kfree(acpi_processor_perf); } #endif |
4ae6673e0 [PATCH] get rid o... |
691 |
kfree(powernow_table); |
1da177e4c Linux-2.6.12-rc2 |
692 693 |
return 0; } |
b9e7638a3 [CPUFREQ] checkpa... |
694 |
static struct freq_attr *powernow_table_attr[] = { |
1da177e4c Linux-2.6.12-rc2 |
695 696 697 |
&cpufreq_freq_attr_scaling_available_freqs, NULL, }; |
221dee285 Revert "[CPUFREQ]... |
698 |
static struct cpufreq_driver powernow_driver = { |
e2f74f355 [ACPI/CPUFREQ] In... |
699 700 701 702 703 704 705 706 707 708 709 |
.verify = powernow_verify, .target = 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", .owner = THIS_MODULE, .attr = powernow_table_attr, |
1da177e4c Linux-2.6.12-rc2 |
710 |
}; |
b9e7638a3 [CPUFREQ] checkpa... |
711 |
static int __init powernow_init(void) |
1da177e4c Linux-2.6.12-rc2 |
712 |
{ |
b9e7638a3 [CPUFREQ] checkpa... |
713 |
if (check_powernow() == 0) |
1da177e4c Linux-2.6.12-rc2 |
714 715 716 |
return -ENODEV; return cpufreq_register_driver(&powernow_driver); } |
b9e7638a3 [CPUFREQ] checkpa... |
717 |
static void __exit powernow_exit(void) |
1da177e4c Linux-2.6.12-rc2 |
718 719 720 721 722 723 |
{ cpufreq_unregister_driver(&powernow_driver); } module_param(acpi_force, int, 0444); MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); |
b9e7638a3 [CPUFREQ] checkpa... |
724 725 726 |
MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); MODULE_DESCRIPTION("Powernow driver for AMD K7 processors."); MODULE_LICENSE("GPL"); |
1da177e4c Linux-2.6.12-rc2 |
727 728 729 |
late_initcall(powernow_init); module_exit(powernow_exit); |