X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fi386%2Fkernel%2Fcpu%2Fcpufreq%2Fpowernow-k7.c;h=c7e3aa60dba5c235eedb7adafc48e81a768ba529;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=65246256fd077474a9ebd8a9ed4ee48307ee23db;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k7.c b/arch/i386/kernel/cpu/cpufreq/powernow-k7.c index 65246256f..c7e3aa60d 100644 --- a/arch/i386/kernel/cpu/cpufreq/powernow-k7.c +++ b/arch/i386/kernel/cpu/cpufreq/powernow-k7.c @@ -6,8 +6,6 @@ * Licensed under the terms of the GNU GPL License version 2. * Based upon datasheets & sample CPUs kindly provided by AMD. * - * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous* - * * Errata 5: Processor 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: Processors with half frequency multipliers may hang upon wakeup from disconnect. @@ -16,33 +14,26 @@ #include #include -#include +#include #include #include #include #include #include +#include #include #include #include #include -#ifdef CONFIG_ACPI_PROCESSOR +#ifdef CONFIG_X86_POWERNOW_K7_ACPI #include #include #endif #include "powernow-k7.h" -#define DEBUG - -#ifdef DEBUG -#define dprintk(msg...) printk(msg) -#else -#define dprintk(msg...) do { } while(0) -#endif - #define PFX "powernow: " @@ -63,7 +54,7 @@ struct pst_s { u8 numpstates; }; -#ifdef CONFIG_ACPI_PROCESSOR +#ifdef CONFIG_X86_POWERNOW_K7_ACPI union powernow_acpi_control_t { struct { unsigned long fid:5, @@ -86,7 +77,7 @@ static int mobile_vid_table[32] = { /* divide by 10 to get FID. */ static int fid_codes[32] = { 110, 115, 120, 125, 50, 55, 60, 65, - 70, 75, 80, 85, 90, 95, 100, 105, + 70, 75, 80, 85, 90, 95, 100, 105, 30, 190, 40, 200, 130, 135, 140, 210, 150, 225, 160, 165, 170, 180, -1, -1, }; @@ -95,7 +86,8 @@ static int fid_codes[32] = { * configuration purpose. */ -static int powernow_acpi_force; +static int acpi_force; +static int debug; static struct cpufreq_frequency_table *powernow_table; @@ -108,6 +100,21 @@ static unsigned int fsb; static unsigned int latency; static char have_a0; +static void dprintk(const char *fmt, ...) +{ + char s[256]; + va_list args; + + if (debug==0) + return; + + va_start(args,fmt); + vsprintf(s, fmt, args); + printk(s); + va_end(args); +} + + static int check_fsb(unsigned int fsbspeed) { int delta; @@ -144,6 +151,11 @@ static int check_powernow(void) } cpuid(0x80000007, &eax, &ebx, &ecx, &edx); + + /* Check we can actually do something before we say anything.*/ + if (!(edx & (1 << 1 | 1 << 2))) + return 0; + printk (KERN_INFO PFX "PowerNOW! Technology present. Can scale: "); if (edx & 1 << 1) { @@ -159,11 +171,6 @@ static int check_powernow(void) can_scale_vid=1; } - if (!(edx & (1 << 1 | 1 << 2))) { - printk ("nothing.\n"); - return 0; - } - printk (".\n"); return 1; } @@ -189,13 +196,13 @@ static int get_ranges (unsigned char *pst) speed = powernow_table[j].frequency; if ((fid_codes[fid] % 10)==5) { -#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) +#ifdef CONFIG_X86_POWERNOW_K7_ACPI if (have_a0 == 1) powernow_table[j].frequency = CPUFREQ_ENTRY_INVALID; #endif } - dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", fid, + dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz]) ", fid, fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000); if (speed < minimum_speed) @@ -284,7 +291,7 @@ static void change_speed (unsigned int index) change_VID(vid); change_FID(fid); } - + if (have_a0 == 1) local_irq_enable(); @@ -293,7 +300,7 @@ static void change_speed (unsigned int index) } -#ifdef CONFIG_ACPI_PROCESSOR +#ifdef CONFIG_X86_POWERNOW_K7_ACPI struct acpi_processor_performance *acpi_processor_perf; @@ -376,7 +383,7 @@ static int powernow_acpi_init(void) powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID; } - dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", fid, + dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz]) ", fid, fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000); dprintk ("VID: 0x%x (%d.%03dV)\n", vid, mobile_vid_table[vid]/1000, mobile_vid_table[vid]%1000); @@ -466,9 +473,9 @@ static int powernow_decode_bios (int maxfid, int startvid) (maxfid==pst->maxfid) && (startvid==pst->startvid)) { dprintk (KERN_INFO PFX "PST:%d (@%p)\n", i, pst); - dprintk (KERN_INFO PFX " cpuid: 0x%x\t", pst->cpuid); - dprintk ("fsb: %d\t", pst->fsbspeed); - dprintk ("maxFID: 0x%x\t", pst->maxfid); + dprintk (KERN_INFO PFX " cpuid: 0x%x ", pst->cpuid); + dprintk ("fsb: %d ", pst->fsbspeed); + dprintk ("maxFID: 0x%x ", pst->maxfid); dprintk ("startvid: 0x%x\n", pst->startvid); ret = get_ranges ((char *) pst + sizeof (struct pst_s)); @@ -540,6 +547,45 @@ static int __init fixup_sgtc(void) 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 __init acer_cpufreq_pst(struct dmi_system_id *d) +{ + printk(KERN_WARNING "%s laptop with broken PST tables in BIOS detected.\n", d->ident); + printk(KERN_WARNING "You need to downgrade to 3A21 (09/09/2002), or try a newer BIOS than 3A71 (01/20/2003)\n"); + printk(KERN_WARNING "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 __initdata 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 __init powernow_cpu_init (struct cpufreq_policy *policy) { union msr_fidvidstatus fidvidstatus; @@ -551,14 +597,14 @@ static int __init powernow_cpu_init (struct cpufreq_policy *policy) rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); /* A K7 with powernow technology is set to max frequency by BIOS */ - fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; + fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.MFID]; if (!fsb) { printk(KERN_WARNING PFX "can not determine bus frequency\n"); return -EINVAL; } dprintk(KERN_INFO PFX "FSB: %3d.%03d MHz\n", fsb/1000, fsb%1000); - if ((dmi_broken & BROKEN_CPUFREQ) || powernow_acpi_force) { + 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 { @@ -588,9 +634,9 @@ static int __init powernow_cpu_init (struct cpufreq_policy *policy) policy->governor = CPUFREQ_DEFAULT_GOVERNOR; - policy->cpuinfo.transition_latency = 20 * latency / fsb; + policy->cpuinfo.transition_latency = cpufreq_scale(2000000UL, fsb, latency); - policy->cur = maximum_speed; + policy->cur = powernow_get(0); cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); @@ -608,13 +654,14 @@ static struct freq_attr* powernow_table_attr[] = { }; static struct cpufreq_driver powernow_driver = { - .verify = powernow_verify, - .target = powernow_target, - .init = powernow_cpu_init, - .exit = powernow_cpu_exit, - .name = "powernow-k7", - .owner = THIS_MODULE, - .attr = powernow_table_attr, + .verify = powernow_verify, + .target = powernow_target, + .get = powernow_get, + .init = powernow_cpu_init, + .exit = powernow_cpu_exit, + .name = "powernow-k7", + .owner = THIS_MODULE, + .attr = powernow_table_attr, }; static int __init powernow_init (void) @@ -627,7 +674,7 @@ static int __init powernow_init (void) static void __exit powernow_exit (void) { -#ifdef CONFIG_ACPI_PROCESSOR +#ifdef CONFIG_X86_POWERNOW_K7_ACPI if (acpi_processor_perf) { acpi_processor_unregister_performance(acpi_processor_perf, 0); kfree(acpi_processor_perf); @@ -638,9 +685,10 @@ static void __exit powernow_exit (void) kfree(powernow_table); } -module_param(powernow_acpi_force, int, 0444); - -MODULE_PARM_DESC(acpi_force, "Force ACPI to be used"); +module_param(debug, int, 0444); +MODULE_PARM_DESC(debug, "enable debug output."); +module_param(acpi_force, int, 0444); +MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); MODULE_AUTHOR ("Dave Jones "); MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors.");