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b43a7ffbf3
policy->cpus contains all online cpus that have single shared clock line. And their frequencies are always updated together. Many SMP system's cpufreq drivers take care of this in individual drivers but the best place for this code is in cpufreq core. This patch modifies cpufreq_notify_transition() to notify frequency change for all cpus in policy->cpus and hence updates all users of this API. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Stephen Warren <swarren@nvidia.com> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
266 lines
6.6 KiB
C
266 lines
6.6 KiB
C
/*
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* This file was based upon code in Powertweak Linux (http://powertweak.sf.net)
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* (C) 2000-2003 Dave Jones, Arjan van de Ven, Janne Pänkälä,
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* Dominik Brodowski.
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*
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* Licensed under the terms of the GNU GPL License version 2.
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*
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* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
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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/cpufreq.h>
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#include <linux/ioport.h>
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#include <linux/timex.h>
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#include <linux/io.h>
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#include <asm/cpu_device_id.h>
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#include <asm/msr.h>
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#define POWERNOW_IOPORT 0xfff0 /* it doesn't matter where, as long
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as it is unused */
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#define PFX "powernow-k6: "
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static unsigned int busfreq; /* FSB, in 10 kHz */
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static unsigned int max_multiplier;
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/* Clock ratio multiplied by 10 - see table 27 in AMD#23446 */
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static struct cpufreq_frequency_table clock_ratio[] = {
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{45, /* 000 -> 4.5x */ 0},
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{50, /* 001 -> 5.0x */ 0},
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{40, /* 010 -> 4.0x */ 0},
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{55, /* 011 -> 5.5x */ 0},
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{20, /* 100 -> 2.0x */ 0},
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{30, /* 101 -> 3.0x */ 0},
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{60, /* 110 -> 6.0x */ 0},
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{35, /* 111 -> 3.5x */ 0},
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{0, CPUFREQ_TABLE_END}
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};
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/**
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* powernow_k6_get_cpu_multiplier - returns the current FSB multiplier
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*
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* Returns the current setting of the frequency multiplier. Core clock
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* speed is frequency of the Front-Side Bus multiplied with this value.
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*/
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static int powernow_k6_get_cpu_multiplier(void)
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{
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u64 invalue = 0;
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u32 msrval;
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msrval = POWERNOW_IOPORT + 0x1;
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wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
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invalue = inl(POWERNOW_IOPORT + 0x8);
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msrval = POWERNOW_IOPORT + 0x0;
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wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
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return clock_ratio[(invalue >> 5)&7].index;
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}
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/**
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* powernow_k6_set_state - set the PowerNow! multiplier
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* @best_i: clock_ratio[best_i] is the target multiplier
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*
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* Tries to change the PowerNow! multiplier
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*/
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static void powernow_k6_set_state(struct cpufreq_policy *policy,
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unsigned int best_i)
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{
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unsigned long outvalue = 0, invalue = 0;
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unsigned long msrval;
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struct cpufreq_freqs freqs;
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if (clock_ratio[best_i].index > max_multiplier) {
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printk(KERN_ERR PFX "invalid target frequency\n");
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return;
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}
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freqs.old = busfreq * powernow_k6_get_cpu_multiplier();
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freqs.new = busfreq * clock_ratio[best_i].index;
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cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
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/* we now need to transform best_i to the BVC format, see AMD#23446 */
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outvalue = (1<<12) | (1<<10) | (1<<9) | (best_i<<5);
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msrval = POWERNOW_IOPORT + 0x1;
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wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
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invalue = inl(POWERNOW_IOPORT + 0x8);
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invalue = invalue & 0xf;
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outvalue = outvalue | invalue;
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outl(outvalue , (POWERNOW_IOPORT + 0x8));
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msrval = POWERNOW_IOPORT + 0x0;
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wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
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cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
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return;
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}
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/**
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* powernow_k6_verify - verifies a new CPUfreq policy
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* @policy: new policy
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*
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* Policy must be within lowest and highest possible CPU Frequency,
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* and at least one possible state must be within min and max.
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*/
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static int powernow_k6_verify(struct cpufreq_policy *policy)
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{
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return cpufreq_frequency_table_verify(policy, &clock_ratio[0]);
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}
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/**
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* powernow_k6_setpolicy - sets a new CPUFreq policy
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* @policy: new policy
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* @target_freq: the target frequency
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* @relation: how that frequency relates to achieved frequency
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* (CPUFREQ_RELATION_L or CPUFREQ_RELATION_H)
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*
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* sets a new CPUFreq policy
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*/
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static int powernow_k6_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, &clock_ratio[0],
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target_freq, relation, &newstate))
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return -EINVAL;
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powernow_k6_set_state(policy, newstate);
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return 0;
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}
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static int powernow_k6_cpu_init(struct cpufreq_policy *policy)
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{
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unsigned int i, f;
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int result;
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if (policy->cpu != 0)
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return -ENODEV;
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/* get frequencies */
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max_multiplier = powernow_k6_get_cpu_multiplier();
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busfreq = cpu_khz / max_multiplier;
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/* table init */
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for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) {
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f = clock_ratio[i].index;
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if (f > max_multiplier)
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clock_ratio[i].frequency = CPUFREQ_ENTRY_INVALID;
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else
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clock_ratio[i].frequency = busfreq * f;
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}
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/* cpuinfo and default policy values */
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policy->cpuinfo.transition_latency = 200000;
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policy->cur = busfreq * max_multiplier;
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result = cpufreq_frequency_table_cpuinfo(policy, clock_ratio);
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if (result)
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return result;
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cpufreq_frequency_table_get_attr(clock_ratio, policy->cpu);
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return 0;
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}
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static int powernow_k6_cpu_exit(struct cpufreq_policy *policy)
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{
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unsigned int i;
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for (i = 0; i < 8; i++) {
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if (i == max_multiplier)
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powernow_k6_set_state(policy, i);
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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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static unsigned int powernow_k6_get(unsigned int cpu)
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{
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unsigned int ret;
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ret = (busfreq * powernow_k6_get_cpu_multiplier());
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return ret;
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}
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static struct freq_attr *powernow_k6_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 powernow_k6_driver = {
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.verify = powernow_k6_verify,
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.target = powernow_k6_target,
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.init = powernow_k6_cpu_init,
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.exit = powernow_k6_cpu_exit,
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.get = powernow_k6_get,
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.name = "powernow-k6",
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.owner = THIS_MODULE,
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.attr = powernow_k6_attr,
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};
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static const struct x86_cpu_id powernow_k6_ids[] = {
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{ X86_VENDOR_AMD, 5, 12 },
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{ X86_VENDOR_AMD, 5, 13 },
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, powernow_k6_ids);
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/**
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* powernow_k6_init - initializes the k6 PowerNow! CPUFreq driver
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*
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* Initializes the K6 PowerNow! support. Returns -ENODEV on unsupported
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* devices, -EINVAL or -ENOMEM on problems during initiatization, and zero
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* on success.
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*/
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static int __init powernow_k6_init(void)
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{
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if (!x86_match_cpu(powernow_k6_ids))
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return -ENODEV;
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if (!request_region(POWERNOW_IOPORT, 16, "PowerNow!")) {
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printk(KERN_INFO PFX "PowerNow IOPORT region already used.\n");
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return -EIO;
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}
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if (cpufreq_register_driver(&powernow_k6_driver)) {
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release_region(POWERNOW_IOPORT, 16);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* powernow_k6_exit - unregisters AMD K6-2+/3+ PowerNow! support
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*
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* Unregisters AMD K6-2+ / K6-3+ PowerNow! support.
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*/
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static void __exit powernow_k6_exit(void)
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{
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cpufreq_unregister_driver(&powernow_k6_driver);
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release_region(POWERNOW_IOPORT, 16);
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}
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MODULE_AUTHOR("Arjan van de Ven, Dave Jones <davej@redhat.com>, "
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"Dominik Brodowski <linux@brodo.de>");
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MODULE_DESCRIPTION("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");
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MODULE_LICENSE("GPL");
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module_init(powernow_k6_init);
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module_exit(powernow_k6_exit);
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