drivers/cpufreq/sh-cpufreq.c

4  * Copyright (C) 2002 - 2012 Paul Mundt
7  * Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c
9  *   Copyright (C) 2004-2007 Atmel Corporation
26 #include <linux/clk.h>
30 static DEFINE_PER_CPU(struct clk, sh_cpuclk);
45 	struct cpufreq_policy *policy = target->policy;  in __sh_cpufreq_target()
46 	int cpu = policy->cpu;  in __sh_cpufreq_target()
47 	struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);  in __sh_cpufreq_target()
53 		return -ENODEV;  in __sh_cpufreq_target()
57 	/* Convert target_freq from kHz to Hz */  in __sh_cpufreq_target()
58 	freq = clk_round_rate(cpuclk, target->freq * 1000);  in __sh_cpufreq_target()
60 	if (freq < (policy->min * 1000) || freq > (policy->max * 1000))  in __sh_cpufreq_target()
61 		return -EINVAL;  in __sh_cpufreq_target()
63 	dev_dbg(dev, "requested frequency %u Hz\n", target->freq * 1000);  in __sh_cpufreq_target()
69 	cpufreq_freq_transition_begin(target->policy, &freqs);  in __sh_cpufreq_target()
71 	cpufreq_freq_transition_end(target->policy, &freqs, 0);  in __sh_cpufreq_target()
73 	dev_dbg(dev, "set frequency %lu Hz\n", freq);  in __sh_cpufreq_target()
86 	return work_on_cpu(policy->cpu, __sh_cpufreq_target, &data);  in sh_cpufreq_target()
91 	struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu);  in sh_cpufreq_verify()
94 	freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;  in sh_cpufreq_verify()
100 	policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000;  in sh_cpufreq_verify()
101 	policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;  in sh_cpufreq_verify()
109 	unsigned int cpu = policy->cpu;  in sh_cpufreq_cpu_init()
110 	struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);  in sh_cpufreq_cpu_init()
118 		dev_err(dev, "couldn't get CPU clk\n");  in sh_cpufreq_cpu_init()
122 	freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;  in sh_cpufreq_cpu_init()
124 		policy->freq_table = freq_table;  in sh_cpufreq_cpu_init()
127 			   "to rate rounding.\n");  in sh_cpufreq_cpu_init()
129 		policy->min = policy->cpuinfo.min_freq =  in sh_cpufreq_cpu_init()
131 		policy->max = policy->cpuinfo.max_freq =  in sh_cpufreq_cpu_init()
140 	unsigned int cpu = policy->cpu;  in sh_cpufreq_cpu_exit()
141 	struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);  in sh_cpufreq_cpu_exit()
173 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");