ed8ce00c52
Enable all CPUs in the shared policy in the CPU init callback. Otherwise, the governor CPUFREQ_GOV_START event is invoked with a policy that only includes the first CPU, leaving other CPUs uninitialized by the governor. Signed-off-by: Todd Poynor <toddpoynor@google.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
248 lines
6.1 KiB
C
248 lines
6.1 KiB
C
/*
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* CPU frequency scaling for OMAP
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*
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* Copyright (C) 2005 Nokia Corporation
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* Written by Tony Lindgren <tony@atomide.com>
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*
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* Based on cpu-sa1110.c, Copyright (C) 2001 Russell King
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*
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* Copyright (C) 2007-2011 Texas Instruments, Inc.
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* - OMAP3/4 support by Rajendra Nayak, Santosh Shilimkar
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/cpufreq.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/opp.h>
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#include <linux/cpu.h>
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#include <asm/system.h>
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#include <asm/smp_plat.h>
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#include <asm/cpu.h>
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#include <plat/clock.h>
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#include <plat/omap-pm.h>
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#include <plat/common.h>
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#include <mach/hardware.h>
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#define VERY_HI_RATE 900000000
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#ifdef CONFIG_SMP
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struct lpj_info {
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unsigned long ref;
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unsigned int freq;
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};
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static DEFINE_PER_CPU(struct lpj_info, lpj_ref);
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static struct lpj_info global_lpj_ref;
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#endif
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static struct cpufreq_frequency_table *freq_table;
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static struct clk *mpu_clk;
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static int omap_verify_speed(struct cpufreq_policy *policy)
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{
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if (freq_table)
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return cpufreq_frequency_table_verify(policy, freq_table);
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if (policy->cpu)
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return -EINVAL;
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cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
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policy->cpuinfo.max_freq);
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policy->min = clk_round_rate(mpu_clk, policy->min * 1000) / 1000;
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policy->max = clk_round_rate(mpu_clk, policy->max * 1000) / 1000;
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cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
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policy->cpuinfo.max_freq);
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return 0;
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}
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static unsigned int omap_getspeed(unsigned int cpu)
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{
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unsigned long rate;
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if (cpu >= NR_CPUS)
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return 0;
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rate = clk_get_rate(mpu_clk) / 1000;
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return rate;
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}
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static int omap_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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int i, ret = 0;
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struct cpufreq_freqs freqs;
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/* Ensure desired rate is within allowed range. Some govenors
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* (ondemand) will just pass target_freq=0 to get the minimum. */
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if (target_freq < policy->min)
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target_freq = policy->min;
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if (target_freq > policy->max)
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target_freq = policy->max;
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freqs.old = omap_getspeed(policy->cpu);
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freqs.new = clk_round_rate(mpu_clk, target_freq * 1000) / 1000;
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freqs.cpu = policy->cpu;
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if (freqs.old == freqs.new)
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return ret;
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/* notifiers */
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for_each_cpu(i, policy->cpus) {
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freqs.cpu = i;
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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}
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#ifdef CONFIG_CPU_FREQ_DEBUG
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pr_info("cpufreq-omap: transition: %u --> %u\n", freqs.old, freqs.new);
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#endif
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ret = clk_set_rate(mpu_clk, freqs.new * 1000);
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freqs.new = omap_getspeed(policy->cpu);
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#ifdef CONFIG_SMP
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/*
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* Note that loops_per_jiffy is not updated on SMP systems in
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* cpufreq driver. So, update the per-CPU loops_per_jiffy value
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* on frequency transition. We need to update all dependent CPUs.
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*/
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for_each_cpu(i, policy->cpus) {
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struct lpj_info *lpj = &per_cpu(lpj_ref, i);
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if (!lpj->freq) {
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lpj->ref = per_cpu(cpu_data, i).loops_per_jiffy;
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lpj->freq = freqs.old;
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}
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per_cpu(cpu_data, i).loops_per_jiffy =
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cpufreq_scale(lpj->ref, lpj->freq, freqs.new);
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}
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/* And don't forget to adjust the global one */
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if (!global_lpj_ref.freq) {
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global_lpj_ref.ref = loops_per_jiffy;
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global_lpj_ref.freq = freqs.old;
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}
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loops_per_jiffy = cpufreq_scale(global_lpj_ref.ref, global_lpj_ref.freq,
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freqs.new);
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#endif
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/* notifiers */
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for_each_cpu(i, policy->cpus) {
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freqs.cpu = i;
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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}
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return ret;
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}
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static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
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{
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int result = 0;
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struct device *mpu_dev;
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if (cpu_is_omap24xx())
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mpu_clk = clk_get(NULL, "virt_prcm_set");
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else if (cpu_is_omap34xx())
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mpu_clk = clk_get(NULL, "dpll1_ck");
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else if (cpu_is_omap44xx())
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mpu_clk = clk_get(NULL, "dpll_mpu_ck");
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if (IS_ERR(mpu_clk))
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return PTR_ERR(mpu_clk);
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if (policy->cpu >= NR_CPUS)
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return -EINVAL;
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policy->cur = policy->min = policy->max = omap_getspeed(policy->cpu);
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mpu_dev = omap2_get_mpuss_device();
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if (!mpu_dev) {
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pr_warning("%s: unable to get the mpu device\n", __func__);
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return -EINVAL;
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}
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opp_init_cpufreq_table(mpu_dev, &freq_table);
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if (freq_table) {
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result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
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if (!result)
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cpufreq_frequency_table_get_attr(freq_table,
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policy->cpu);
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} else {
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policy->cpuinfo.min_freq = clk_round_rate(mpu_clk, 0) / 1000;
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policy->cpuinfo.max_freq = clk_round_rate(mpu_clk,
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VERY_HI_RATE) / 1000;
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}
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policy->min = policy->cpuinfo.min_freq;
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policy->max = policy->cpuinfo.max_freq;
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policy->cur = omap_getspeed(policy->cpu);
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/*
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* On OMAP SMP configuartion, both processors share the voltage
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* and clock. So both CPUs needs to be scaled together and hence
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* needs software co-ordination. Use cpufreq affected_cpus
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* interface to handle this scenario. Additional is_smp() check
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* is to keep SMP_ON_UP build working.
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*/
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if (is_smp()) {
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policy->shared_type = CPUFREQ_SHARED_TYPE_ANY;
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cpumask_setall(policy->cpus);
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}
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/* FIXME: what's the actual transition time? */
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policy->cpuinfo.transition_latency = 300 * 1000;
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return 0;
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}
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static int omap_cpu_exit(struct cpufreq_policy *policy)
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{
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clk_exit_cpufreq_table(&freq_table);
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clk_put(mpu_clk);
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return 0;
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}
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static struct freq_attr *omap_cpufreq_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 omap_driver = {
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.flags = CPUFREQ_STICKY,
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.verify = omap_verify_speed,
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.target = omap_target,
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.get = omap_getspeed,
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.init = omap_cpu_init,
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.exit = omap_cpu_exit,
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.name = "omap",
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.attr = omap_cpufreq_attr,
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};
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static int __init omap_cpufreq_init(void)
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{
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return cpufreq_register_driver(&omap_driver);
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}
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static void __exit omap_cpufreq_exit(void)
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{
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cpufreq_unregister_driver(&omap_driver);
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}
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MODULE_DESCRIPTION("cpufreq driver for OMAP SoCs");
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MODULE_LICENSE("GPL");
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module_init(omap_cpufreq_init);
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module_exit(omap_cpufreq_exit);
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