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authorViresh Kumar <viresh.kumar@linaro.org>2013-04-04 08:54:22 -0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-04-10 07:19:25 -0400
commit7258267e56325d41f468eb650b6c23f697201645 (patch)
tree6fc0d8924cd897ff1c51c989d3479e5a38bacfc5 /arch/sh/kernel/cpufreq.c
parent7a9989356b23fa2c7731632d3b575c53c1ac8bce (diff)
cpufreq: sh: move cpufreq driver to drivers/cpufreq
This patch moves cpufreq driver of SUPERH architecture to drivers/cpufreq. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/sh/kernel/cpufreq.c')
-rw-r--r--arch/sh/kernel/cpufreq.c191
1 files changed, 0 insertions, 191 deletions
diff --git a/arch/sh/kernel/cpufreq.c b/arch/sh/kernel/cpufreq.c
deleted file mode 100644
index 88c8feedf785..000000000000
--- a/arch/sh/kernel/cpufreq.c
+++ /dev/null
@@ -1,191 +0,0 @@
1/*
2 * arch/sh/kernel/cpufreq.c
3 *
4 * cpufreq driver for the SuperH processors.
5 *
6 * Copyright (C) 2002 - 2012 Paul Mundt
7 * Copyright (C) 2002 M. R. Brown
8 *
9 * Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c
10 *
11 * Copyright (C) 2004-2007 Atmel Corporation
12 *
13 * This file is subject to the terms and conditions of the GNU General Public
14 * License. See the file "COPYING" in the main directory of this archive
15 * for more details.
16 */
17#define pr_fmt(fmt) "cpufreq: " fmt
18
19#include <linux/types.h>
20#include <linux/cpufreq.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/err.h>
25#include <linux/cpumask.h>
26#include <linux/cpu.h>
27#include <linux/smp.h>
28#include <linux/sched.h> /* set_cpus_allowed() */
29#include <linux/clk.h>
30#include <linux/percpu.h>
31#include <linux/sh_clk.h>
32
33static DEFINE_PER_CPU(struct clk, sh_cpuclk);
34
35static unsigned int sh_cpufreq_get(unsigned int cpu)
36{
37 return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000;
38}
39
40/*
41 * Here we notify other drivers of the proposed change and the final change.
42 */
43static int sh_cpufreq_target(struct cpufreq_policy *policy,
44 unsigned int target_freq,
45 unsigned int relation)
46{
47 unsigned int cpu = policy->cpu;
48 struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
49 cpumask_t cpus_allowed;
50 struct cpufreq_freqs freqs;
51 struct device *dev;
52 long freq;
53
54 cpus_allowed = current->cpus_allowed;
55 set_cpus_allowed_ptr(current, cpumask_of(cpu));
56
57 BUG_ON(smp_processor_id() != cpu);
58
59 dev = get_cpu_device(cpu);
60
61 /* Convert target_freq from kHz to Hz */
62 freq = clk_round_rate(cpuclk, target_freq * 1000);
63
64 if (freq < (policy->min * 1000) || freq > (policy->max * 1000))
65 return -EINVAL;
66
67 dev_dbg(dev, "requested frequency %u Hz\n", target_freq * 1000);
68
69 freqs.old = sh_cpufreq_get(cpu);
70 freqs.new = (freq + 500) / 1000;
71 freqs.flags = 0;
72
73 cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
74 set_cpus_allowed_ptr(current, &cpus_allowed);
75 clk_set_rate(cpuclk, freq);
76 cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
77
78 dev_dbg(dev, "set frequency %lu Hz\n", freq);
79
80 return 0;
81}
82
83static int sh_cpufreq_verify(struct cpufreq_policy *policy)
84{
85 struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu);
86 struct cpufreq_frequency_table *freq_table;
87
88 freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
89 if (freq_table)
90 return cpufreq_frequency_table_verify(policy, freq_table);
91
92 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
93 policy->cpuinfo.max_freq);
94
95 policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000;
96 policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
97
98 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
99 policy->cpuinfo.max_freq);
100
101 return 0;
102}
103
104static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy)
105{
106 unsigned int cpu = policy->cpu;
107 struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
108 struct cpufreq_frequency_table *freq_table;
109 struct device *dev;
110
111 dev = get_cpu_device(cpu);
112
113 cpuclk = clk_get(dev, "cpu_clk");
114 if (IS_ERR(cpuclk)) {
115 dev_err(dev, "couldn't get CPU clk\n");
116 return PTR_ERR(cpuclk);
117 }
118
119 policy->cur = sh_cpufreq_get(cpu);
120
121 freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
122 if (freq_table) {
123 int result;
124
125 result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
126 if (!result)
127 cpufreq_frequency_table_get_attr(freq_table, cpu);
128 } else {
129 dev_notice(dev, "no frequency table found, falling back "
130 "to rate rounding.\n");
131
132 policy->min = policy->cpuinfo.min_freq =
133 (clk_round_rate(cpuclk, 1) + 500) / 1000;
134 policy->max = policy->cpuinfo.max_freq =
135 (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
136 }
137
138 policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
139
140 dev_info(dev, "CPU Frequencies - Minimum %u.%03u MHz, "
141 "Maximum %u.%03u MHz.\n",
142 policy->min / 1000, policy->min % 1000,
143 policy->max / 1000, policy->max % 1000);
144
145 return 0;
146}
147
148static int sh_cpufreq_cpu_exit(struct cpufreq_policy *policy)
149{
150 unsigned int cpu = policy->cpu;
151 struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
152
153 cpufreq_frequency_table_put_attr(cpu);
154 clk_put(cpuclk);
155
156 return 0;
157}
158
159static struct freq_attr *sh_freq_attr[] = {
160 &cpufreq_freq_attr_scaling_available_freqs,
161 NULL,
162};
163
164static struct cpufreq_driver sh_cpufreq_driver = {
165 .owner = THIS_MODULE,
166 .name = "sh",
167 .get = sh_cpufreq_get,
168 .target = sh_cpufreq_target,
169 .verify = sh_cpufreq_verify,
170 .init = sh_cpufreq_cpu_init,
171 .exit = sh_cpufreq_cpu_exit,
172 .attr = sh_freq_attr,
173};
174
175static int __init sh_cpufreq_module_init(void)
176{
177 pr_notice("SuperH CPU frequency driver.\n");
178 return cpufreq_register_driver(&sh_cpufreq_driver);
179}
180
181static void __exit sh_cpufreq_module_exit(void)
182{
183 cpufreq_unregister_driver(&sh_cpufreq_driver);
184}
185
186module_init(sh_cpufreq_module_init);
187module_exit(sh_cpufreq_module_exit);
188
189MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
190MODULE_DESCRIPTION("cpufreq driver for SuperH");
191MODULE_LICENSE("GPL");
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