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
27 #include <linux/clk.h>
31 static DEFINE_PER_CPU(struct clk, sh_cpuclk);
46 	struct cpufreq_policy *policy = target->policy;  in __sh_cpufreq_target()
47 	int cpu = policy->cpu;  in __sh_cpufreq_target()
48 	struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);  in __sh_cpufreq_target()
54 		return -ENODEV;  in __sh_cpufreq_target()
58 	/* Convert target_freq from kHz to Hz */  in __sh_cpufreq_target()
59 	freq = clk_round_rate(cpuclk, target->freq * 1000);  in __sh_cpufreq_target()
61 	if (freq < (policy->min * 1000) || freq > (policy->max * 1000))  in __sh_cpufreq_target()
62 		return -EINVAL;  in __sh_cpufreq_target()
64 	dev_dbg(dev, "requested frequency %u Hz\n", target->freq * 1000);  in __sh_cpufreq_target()
70 	cpufreq_freq_transition_begin(target->policy, &freqs);  in __sh_cpufreq_target()
72 	cpufreq_freq_transition_end(target->policy, &freqs, 0);  in __sh_cpufreq_target()
74 	dev_dbg(dev, "set frequency %lu Hz\n", freq);  in __sh_cpufreq_target()
87 	return work_on_cpu(policy->cpu, __sh_cpufreq_target, &data);  in sh_cpufreq_target()
92 	struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu);  in sh_cpufreq_verify()
95 	freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;  in sh_cpufreq_verify()
101 	policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000;  in sh_cpufreq_verify()
102 	policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;  in sh_cpufreq_verify()
110 	unsigned int cpu = policy->cpu;  in sh_cpufreq_cpu_init()
111 	struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);  in sh_cpufreq_cpu_init()
119 		dev_err(dev, "couldn't get CPU clk\n");  in sh_cpufreq_cpu_init()
123 	freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;  in sh_cpufreq_cpu_init()
125 		policy->freq_table = freq_table;  in sh_cpufreq_cpu_init()
128 			   "to rate rounding.\n");  in sh_cpufreq_cpu_init()
130 		policy->min = policy->cpuinfo.min_freq =  in sh_cpufreq_cpu_init()
132 		policy->max = policy->cpuinfo.max_freq =  in sh_cpufreq_cpu_init()
141 	unsigned int cpu = policy->cpu;  in sh_cpufreq_cpu_exit()
142 	struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);  in sh_cpufreq_cpu_exit()
151 	struct device *dev = get_cpu_device(policy->cpu);  in sh_cpufreq_cpu_ready()
153 	dev_info(dev, "CPU Frequencies - Minimum %u.%03u MHz, "  in sh_cpufreq_cpu_ready()
155 	       policy->min / 1000, policy->min % 1000,  in sh_cpufreq_cpu_ready()
156 	       policy->max / 1000, policy->max % 1000);  in sh_cpufreq_cpu_ready()
185 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");