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![Andi Kleen](/assets/img/avatar_default.png)
This marks all the x86 cpuinfo tables to the CPU specific device drivers, to allow auto loading by udev. This should simplify the distribution startup scripts for this greatly. I didn't add MODULE_DEVICE_IDs to the centrino and p4-clockmod drivers, because those probably shouldn't be auto loaded and the acpi driver be used instead (not fully sure on that, would appreciate feedback) The old nforce drivers autoload based on the PCI ID. ACPI cpufreq is autoloaded in another patch. v3: Autoload gx based on PCI IDs only. Remove cpu check (Dave Jones) v4: Use newly introduce HW_PSTATE feature for powernow-k8 loading Cc: Dave Jones <davej@redhat.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Thomas Renninger <trenn@suse.de> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
309 lines
7.5 KiB
C
309 lines
7.5 KiB
C
/*
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* elanfreq: cpufreq driver for the AMD ELAN family
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*
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* (c) Copyright 2002 Robert Schwebel <r.schwebel@pengutronix.de>
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*
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* Parts of this code are (c) Sven Geggus <sven@geggus.net>
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*
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* 2002-02-13: - initial revision for 2.4.18-pre9 by Robert Schwebel
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*
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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/init.h>
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#include <linux/delay.h>
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#include <linux/cpufreq.h>
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#include <asm/cpu_device_id.h>
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#include <asm/msr.h>
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#include <linux/timex.h>
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#include <linux/io.h>
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#define REG_CSCIR 0x22 /* Chip Setup and Control Index Register */
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#define REG_CSCDR 0x23 /* Chip Setup and Control Data Register */
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/* Module parameter */
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static int max_freq;
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struct s_elan_multiplier {
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int clock; /* frequency in kHz */
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int val40h; /* PMU Force Mode register */
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int val80h; /* CPU Clock Speed Register */
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};
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/*
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* It is important that the frequencies
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* are listed in ascending order here!
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*/
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static struct s_elan_multiplier elan_multiplier[] = {
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{1000, 0x02, 0x18},
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{2000, 0x02, 0x10},
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{4000, 0x02, 0x08},
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{8000, 0x00, 0x00},
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{16000, 0x00, 0x02},
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{33000, 0x00, 0x04},
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{66000, 0x01, 0x04},
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{99000, 0x01, 0x05}
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};
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static struct cpufreq_frequency_table elanfreq_table[] = {
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{0, 1000},
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{1, 2000},
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{2, 4000},
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{3, 8000},
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{4, 16000},
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{5, 33000},
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{6, 66000},
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{7, 99000},
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{0, CPUFREQ_TABLE_END},
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};
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/**
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* elanfreq_get_cpu_frequency: determine current cpu speed
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*
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* Finds out at which frequency the CPU of the Elan SOC runs
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* at the moment. Frequencies from 1 to 33 MHz are generated
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* the normal way, 66 and 99 MHz are called "Hyperspeed Mode"
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* and have the rest of the chip running with 33 MHz.
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*/
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static unsigned int elanfreq_get_cpu_frequency(unsigned int cpu)
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{
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u8 clockspeed_reg; /* Clock Speed Register */
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local_irq_disable();
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outb_p(0x80, REG_CSCIR);
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clockspeed_reg = inb_p(REG_CSCDR);
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local_irq_enable();
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if ((clockspeed_reg & 0xE0) == 0xE0)
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return 0;
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/* Are we in CPU clock multiplied mode (66/99 MHz)? */
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if ((clockspeed_reg & 0xE0) == 0xC0) {
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if ((clockspeed_reg & 0x01) == 0)
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return 66000;
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else
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return 99000;
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}
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/* 33 MHz is not 32 MHz... */
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if ((clockspeed_reg & 0xE0) == 0xA0)
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return 33000;
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return (1<<((clockspeed_reg & 0xE0) >> 5)) * 1000;
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}
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/**
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* elanfreq_set_cpu_frequency: Change the CPU core frequency
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* @cpu: cpu number
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* @freq: frequency in kHz
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*
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* This function takes a frequency value and changes the CPU frequency
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* according to this. Note that the frequency has to be checked by
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* elanfreq_validatespeed() for correctness!
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*
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* There is no return value.
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*/
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static void elanfreq_set_cpu_state(unsigned int state)
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{
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struct cpufreq_freqs freqs;
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freqs.old = elanfreq_get_cpu_frequency(0);
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freqs.new = elan_multiplier[state].clock;
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freqs.cpu = 0; /* elanfreq.c is UP only driver */
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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printk(KERN_INFO "elanfreq: attempting to set frequency to %i kHz\n",
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elan_multiplier[state].clock);
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/*
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* Access to the Elan's internal registers is indexed via
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* 0x22: Chip Setup & Control Register Index Register (CSCI)
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* 0x23: Chip Setup & Control Register Data Register (CSCD)
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*
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*/
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/*
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* 0x40 is the Power Management Unit's Force Mode Register.
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* Bit 6 enables Hyperspeed Mode (66/100 MHz core frequency)
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*/
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local_irq_disable();
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outb_p(0x40, REG_CSCIR); /* Disable hyperspeed mode */
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outb_p(0x00, REG_CSCDR);
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local_irq_enable(); /* wait till internal pipelines and */
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udelay(1000); /* buffers have cleaned up */
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local_irq_disable();
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/* now, set the CPU clock speed register (0x80) */
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outb_p(0x80, REG_CSCIR);
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outb_p(elan_multiplier[state].val80h, REG_CSCDR);
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/* now, the hyperspeed bit in PMU Force Mode Register (0x40) */
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outb_p(0x40, REG_CSCIR);
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outb_p(elan_multiplier[state].val40h, REG_CSCDR);
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udelay(10000);
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local_irq_enable();
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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};
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/**
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* elanfreq_validatespeed: test if frequency range is valid
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* @policy: the policy to validate
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*
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* This function checks if a given frequency range in kHz is valid
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* for the hardware supported by the driver.
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*/
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static int elanfreq_verify(struct cpufreq_policy *policy)
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{
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return cpufreq_frequency_table_verify(policy, &elanfreq_table[0]);
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}
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static int elanfreq_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation)
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{
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unsigned int newstate = 0;
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if (cpufreq_frequency_table_target(policy, &elanfreq_table[0],
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target_freq, relation, &newstate))
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return -EINVAL;
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elanfreq_set_cpu_state(newstate);
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return 0;
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}
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/*
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* Module init and exit code
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*/
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static int elanfreq_cpu_init(struct cpufreq_policy *policy)
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{
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struct cpuinfo_x86 *c = &cpu_data(0);
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unsigned int i;
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int result;
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/* capability check */
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if ((c->x86_vendor != X86_VENDOR_AMD) ||
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(c->x86 != 4) || (c->x86_model != 10))
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return -ENODEV;
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/* max freq */
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if (!max_freq)
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max_freq = elanfreq_get_cpu_frequency(0);
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/* table init */
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for (i = 0; (elanfreq_table[i].frequency != CPUFREQ_TABLE_END); i++) {
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if (elanfreq_table[i].frequency > max_freq)
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elanfreq_table[i].frequency = CPUFREQ_ENTRY_INVALID;
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}
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/* cpuinfo and default policy values */
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policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
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policy->cur = elanfreq_get_cpu_frequency(0);
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result = cpufreq_frequency_table_cpuinfo(policy, elanfreq_table);
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if (result)
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return result;
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cpufreq_frequency_table_get_attr(elanfreq_table, policy->cpu);
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return 0;
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}
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static int elanfreq_cpu_exit(struct cpufreq_policy *policy)
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{
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cpufreq_frequency_table_put_attr(policy->cpu);
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return 0;
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}
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#ifndef MODULE
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/**
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* elanfreq_setup - elanfreq command line parameter parsing
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*
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* elanfreq command line parameter. Use:
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* elanfreq=66000
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* to set the maximum CPU frequency to 66 MHz. Note that in
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* case you do not give this boot parameter, the maximum
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* frequency will fall back to _current_ CPU frequency which
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* might be lower. If you build this as a module, use the
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* max_freq module parameter instead.
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*/
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static int __init elanfreq_setup(char *str)
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{
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max_freq = simple_strtoul(str, &str, 0);
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printk(KERN_WARNING "You're using the deprecated elanfreq command line option. Use elanfreq.max_freq instead, please!\n");
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return 1;
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}
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__setup("elanfreq=", elanfreq_setup);
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#endif
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static struct freq_attr *elanfreq_attr[] = {
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&cpufreq_freq_attr_scaling_available_freqs,
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NULL,
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};
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static struct cpufreq_driver elanfreq_driver = {
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.get = elanfreq_get_cpu_frequency,
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.verify = elanfreq_verify,
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.target = elanfreq_target,
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.init = elanfreq_cpu_init,
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.exit = elanfreq_cpu_exit,
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.name = "elanfreq",
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.owner = THIS_MODULE,
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.attr = elanfreq_attr,
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};
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static const struct x86_cpu_id elan_id[] = {
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{ X86_VENDOR_AMD, 4, 10, },
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, elan_id);
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static int __init elanfreq_init(void)
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{
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if (!x86_match_cpu(elan_id))
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return -ENODEV;
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return cpufreq_register_driver(&elanfreq_driver);
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}
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static void __exit elanfreq_exit(void)
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{
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cpufreq_unregister_driver(&elanfreq_driver);
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}
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module_param(max_freq, int, 0444);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Robert Schwebel <r.schwebel@pengutronix.de>, "
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"Sven Geggus <sven@geggus.net>");
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MODULE_DESCRIPTION("cpufreq driver for AMD's Elan CPUs");
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module_init(elanfreq_init);
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module_exit(elanfreq_exit);
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