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Diffstat (limited to 'arch/sh/kernel/cpufreq.c')
-rw-r--r--arch/sh/kernel/cpufreq.c121
1 files changed, 82 insertions, 39 deletions
diff --git a/arch/sh/kernel/cpufreq.c b/arch/sh/kernel/cpufreq.c
index 0fffacea6ed9..e68b45b6f3f9 100644
--- a/arch/sh/kernel/cpufreq.c
+++ b/arch/sh/kernel/cpufreq.c
@@ -3,7 +3,7 @@
3 * 3 *
4 * cpufreq driver for the SuperH processors. 4 * cpufreq driver for the SuperH processors.
5 * 5 *
6 * Copyright (C) 2002 - 2007 Paul Mundt 6 * Copyright (C) 2002 - 2012 Paul Mundt
7 * Copyright (C) 2002 M. R. Brown 7 * Copyright (C) 2002 M. R. Brown
8 * 8 *
9 * Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c 9 * Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c
@@ -14,6 +14,8 @@
14 * License. See the file "COPYING" in the main directory of this archive 14 * License. See the file "COPYING" in the main directory of this archive
15 * for more details. 15 * for more details.
16 */ 16 */
17#define pr_fmt(fmt) "cpufreq: " fmt
18
17#include <linux/types.h> 19#include <linux/types.h>
18#include <linux/cpufreq.h> 20#include <linux/cpufreq.h>
19#include <linux/kernel.h> 21#include <linux/kernel.h>
@@ -21,15 +23,18 @@
21#include <linux/init.h> 23#include <linux/init.h>
22#include <linux/err.h> 24#include <linux/err.h>
23#include <linux/cpumask.h> 25#include <linux/cpumask.h>
26#include <linux/cpu.h>
24#include <linux/smp.h> 27#include <linux/smp.h>
25#include <linux/sched.h> /* set_cpus_allowed() */ 28#include <linux/sched.h> /* set_cpus_allowed() */
26#include <linux/clk.h> 29#include <linux/clk.h>
30#include <linux/percpu.h>
31#include <linux/sh_clk.h>
27 32
28static struct clk *cpuclk; 33static DEFINE_PER_CPU(struct clk, sh_cpuclk);
29 34
30static unsigned int sh_cpufreq_get(unsigned int cpu) 35static unsigned int sh_cpufreq_get(unsigned int cpu)
31{ 36{
32 return (clk_get_rate(cpuclk) + 500) / 1000; 37 return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000;
33} 38}
34 39
35/* 40/*
@@ -40,8 +45,10 @@ static int sh_cpufreq_target(struct cpufreq_policy *policy,
40 unsigned int relation) 45 unsigned int relation)
41{ 46{
42 unsigned int cpu = policy->cpu; 47 unsigned int cpu = policy->cpu;
48 struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
43 cpumask_t cpus_allowed; 49 cpumask_t cpus_allowed;
44 struct cpufreq_freqs freqs; 50 struct cpufreq_freqs freqs;
51 struct device *dev;
45 long freq; 52 long freq;
46 53
47 if (!cpu_online(cpu)) 54 if (!cpu_online(cpu))
@@ -52,13 +59,15 @@ static int sh_cpufreq_target(struct cpufreq_policy *policy,
52 59
53 BUG_ON(smp_processor_id() != cpu); 60 BUG_ON(smp_processor_id() != cpu);
54 61
62 dev = get_cpu_device(cpu);
63
55 /* Convert target_freq from kHz to Hz */ 64 /* Convert target_freq from kHz to Hz */
56 freq = clk_round_rate(cpuclk, target_freq * 1000); 65 freq = clk_round_rate(cpuclk, target_freq * 1000);
57 66
58 if (freq < (policy->min * 1000) || freq > (policy->max * 1000)) 67 if (freq < (policy->min * 1000) || freq > (policy->max * 1000))
59 return -EINVAL; 68 return -EINVAL;
60 69
61 pr_debug("cpufreq: requested frequency %u Hz\n", target_freq * 1000); 70 dev_dbg(dev, "requested frequency %u Hz\n", target_freq * 1000);
62 71
63 freqs.cpu = cpu; 72 freqs.cpu = cpu;
64 freqs.old = sh_cpufreq_get(cpu); 73 freqs.old = sh_cpufreq_get(cpu);
@@ -70,78 +79,112 @@ static int sh_cpufreq_target(struct cpufreq_policy *policy,
70 clk_set_rate(cpuclk, freq); 79 clk_set_rate(cpuclk, freq);
71 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); 80 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
72 81
73 pr_debug("cpufreq: set frequency %lu Hz\n", freq); 82 dev_dbg(dev, "set frequency %lu Hz\n", freq);
83
84 return 0;
85}
86
87static int sh_cpufreq_verify(struct cpufreq_policy *policy)
88{
89 struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu);
90 struct cpufreq_frequency_table *freq_table;
91
92 freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
93 if (freq_table)
94 return cpufreq_frequency_table_verify(policy, freq_table);
95
96 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
97 policy->cpuinfo.max_freq);
98
99 policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000;
100 policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
101
102 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
103 policy->cpuinfo.max_freq);
74 104
75 return 0; 105 return 0;
76} 106}
77 107
78static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy) 108static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy)
79{ 109{
80 if (!cpu_online(policy->cpu)) 110 unsigned int cpu = policy->cpu;
111 struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
112 struct cpufreq_frequency_table *freq_table;
113 struct device *dev;
114
115 if (!cpu_online(cpu))
81 return -ENODEV; 116 return -ENODEV;
82 117
83 cpuclk = clk_get(NULL, "cpu_clk"); 118 dev = get_cpu_device(cpu);
119
120 cpuclk = clk_get(dev, "cpu_clk");
84 if (IS_ERR(cpuclk)) { 121 if (IS_ERR(cpuclk)) {
85 printk(KERN_ERR "cpufreq: couldn't get CPU#%d clk\n", 122 dev_err(dev, "couldn't get CPU clk\n");
86 policy->cpu);
87 return PTR_ERR(cpuclk); 123 return PTR_ERR(cpuclk);
88 } 124 }
89 125
90 /* cpuinfo and default policy values */ 126 policy->cur = policy->min = policy->max = sh_cpufreq_get(cpu);
91 policy->cpuinfo.min_freq = (clk_round_rate(cpuclk, 1) + 500) / 1000;
92 policy->cpuinfo.max_freq = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
93 policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
94 127
95 policy->cur = sh_cpufreq_get(policy->cpu); 128 freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
96 policy->min = policy->cpuinfo.min_freq; 129 if (freq_table) {
97 policy->max = policy->cpuinfo.max_freq; 130 int result;
98 131
99 /* 132 result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
100 * Catch the cases where the clock framework hasn't been wired up 133 if (!result)
101 * properly to support scaling. 134 cpufreq_frequency_table_get_attr(freq_table, cpu);
102 */ 135 } else {
103 if (unlikely(policy->min == policy->max)) { 136 dev_notice(dev, "no frequency table found, falling back "
104 printk(KERN_ERR "cpufreq: clock framework rate rounding " 137 "to rate rounding.\n");
105 "not supported on CPU#%d.\n", policy->cpu);
106 138
107 clk_put(cpuclk); 139 policy->cpuinfo.min_freq =
108 return -EINVAL; 140 (clk_round_rate(cpuclk, 1) + 500) / 1000;
141 policy->cpuinfo.max_freq =
142 (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
109 } 143 }
110 144
111 printk(KERN_INFO "cpufreq: CPU#%d Frequencies - Minimum %u.%03u MHz, " 145 policy->min = policy->cpuinfo.min_freq;
146 policy->max = policy->cpuinfo.max_freq;
147
148 policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
149
150 dev_info(dev, "CPU Frequencies - Minimum %u.%03u MHz, "
112 "Maximum %u.%03u MHz.\n", 151 "Maximum %u.%03u MHz.\n",
113 policy->cpu, policy->min / 1000, policy->min % 1000, 152 policy->min / 1000, policy->min % 1000,
114 policy->max / 1000, policy->max % 1000); 153 policy->max / 1000, policy->max % 1000);
115 154
116 return 0; 155 return 0;
117} 156}
118 157
119static int sh_cpufreq_verify(struct cpufreq_policy *policy) 158static int sh_cpufreq_cpu_exit(struct cpufreq_policy *policy)
120{ 159{
121 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, 160 unsigned int cpu = policy->cpu;
122 policy->cpuinfo.max_freq); 161 struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
123 return 0;
124}
125 162
126static int sh_cpufreq_exit(struct cpufreq_policy *policy) 163 cpufreq_frequency_table_put_attr(cpu);
127{
128 clk_put(cpuclk); 164 clk_put(cpuclk);
165
129 return 0; 166 return 0;
130} 167}
131 168
169static struct freq_attr *sh_freq_attr[] = {
170 &cpufreq_freq_attr_scaling_available_freqs,
171 NULL,
172};
173
132static struct cpufreq_driver sh_cpufreq_driver = { 174static struct cpufreq_driver sh_cpufreq_driver = {
133 .owner = THIS_MODULE, 175 .owner = THIS_MODULE,
134 .name = "sh", 176 .name = "sh",
135 .init = sh_cpufreq_cpu_init,
136 .verify = sh_cpufreq_verify,
137 .target = sh_cpufreq_target,
138 .get = sh_cpufreq_get, 177 .get = sh_cpufreq_get,
139 .exit = sh_cpufreq_exit, 178 .target = sh_cpufreq_target,
179 .verify = sh_cpufreq_verify,
180 .init = sh_cpufreq_cpu_init,
181 .exit = sh_cpufreq_cpu_exit,
182 .attr = sh_freq_attr,
140}; 183};
141 184
142static int __init sh_cpufreq_module_init(void) 185static int __init sh_cpufreq_module_init(void)
143{ 186{
144 printk(KERN_INFO "cpufreq: SuperH CPU frequency driver.\n"); 187 pr_notice("SuperH CPU frequency driver.\n");
145 return cpufreq_register_driver(&sh_cpufreq_driver); 188 return cpufreq_register_driver(&sh_cpufreq_driver);
146} 189}
147 190
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-14 14:45:48 -0500