diff options
Diffstat (limited to 'arch/avr32/mach-at32ap/cpufreq.c')
| -rw-r--r-- | arch/avr32/mach-at32ap/cpufreq.c | 124 | 
1 files changed, 0 insertions, 124 deletions
diff --git a/arch/avr32/mach-at32ap/cpufreq.c b/arch/avr32/mach-at32ap/cpufreq.c deleted file mode 100644 index 18b765629a0..00000000000 --- a/arch/avr32/mach-at32ap/cpufreq.c +++ /dev/null @@ -1,124 +0,0 @@ -/* - * Copyright (C) 2004-2007 Atmel Corporation - * - * Based on MIPS implementation arch/mips/kernel/time.c - *   Copyright 2001 MontaVista Software Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -/*#define DEBUG*/ - -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/init.h> -#include <linux/cpufreq.h> -#include <linux/io.h> -#include <linux/clk.h> -#include <linux/err.h> -#include <linux/export.h> - -static struct clk *cpuclk; - -static int at32_verify_speed(struct cpufreq_policy *policy) -{ -	if (policy->cpu != 0) -		return -EINVAL; - -	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, -			policy->cpuinfo.max_freq); -	return 0; -} - -static unsigned int at32_get_speed(unsigned int cpu) -{ -	/* No SMP support */ -	if (cpu) -		return 0; -	return (unsigned int)((clk_get_rate(cpuclk) + 500) / 1000); -} - -static unsigned int	ref_freq; -static unsigned long	loops_per_jiffy_ref; - -static int at32_set_target(struct cpufreq_policy *policy, -			  unsigned int target_freq, -			  unsigned int relation) -{ -	struct cpufreq_freqs freqs; -	long freq; - -	/* Convert target_freq from kHz to Hz */ -	freq = clk_round_rate(cpuclk, target_freq * 1000); - -	/* Check if policy->min <= new_freq <= policy->max */ -	if(freq < (policy->min * 1000) || freq > (policy->max * 1000)) -		return -EINVAL; - -	pr_debug("cpufreq: requested frequency %u Hz\n", target_freq * 1000); - -	freqs.old = at32_get_speed(0); -	freqs.new = (freq + 500) / 1000; -	freqs.cpu = 0; -	freqs.flags = 0; - -	if (!ref_freq) { -		ref_freq = freqs.old; -		loops_per_jiffy_ref = boot_cpu_data.loops_per_jiffy; -	} - -	cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); -	if (freqs.old < freqs.new) -		boot_cpu_data.loops_per_jiffy = cpufreq_scale( -				loops_per_jiffy_ref, ref_freq, freqs.new); -	clk_set_rate(cpuclk, freq); -	if (freqs.new < freqs.old) -		boot_cpu_data.loops_per_jiffy = cpufreq_scale( -				loops_per_jiffy_ref, ref_freq, freqs.new); -	cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - -	pr_debug("cpufreq: set frequency %lu Hz\n", freq); - -	return 0; -} - -static int __init at32_cpufreq_driver_init(struct cpufreq_policy *policy) -{ -	if (policy->cpu != 0) -		return -EINVAL; - -	cpuclk = clk_get(NULL, "cpu"); -	if (IS_ERR(cpuclk)) { -		pr_debug("cpufreq: could not get CPU clk\n"); -		return PTR_ERR(cpuclk); -	} - -	policy->cpuinfo.min_freq = (clk_round_rate(cpuclk, 1) + 500) / 1000; -	policy->cpuinfo.max_freq = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000; -	policy->cpuinfo.transition_latency = 0; -	policy->cur = at32_get_speed(0); -	policy->min = policy->cpuinfo.min_freq; -	policy->max = policy->cpuinfo.max_freq; - -	printk("cpufreq: AT32AP CPU frequency driver\n"); - -	return 0; -} - -static struct cpufreq_driver at32_driver = { -	.name		= "at32ap", -	.owner		= THIS_MODULE, -	.init		= at32_cpufreq_driver_init, -	.verify		= at32_verify_speed, -	.target		= at32_set_target, -	.get		= at32_get_speed, -	.flags		= CPUFREQ_STICKY, -}; - -static int __init at32_cpufreq_init(void) -{ -	return cpufreq_register_driver(&at32_driver); -} -late_initcall(at32_cpufreq_init);  |