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16#include <linux/platform_device.h>
17#include <linux/kernel.h>
18#include <linux/cpufreq.h>
19#include <linux/delay.h>
20
21#include <mach/hardware.h>
22#include <mach/prcmu.h>
23#include <mach/prcmu-defs.h>
24
25#define DRIVER_NAME "cpufreq-u8500"
26#define CPUFREQ_NAME "u8500"
27
28static struct device *dev;
29
30static struct cpufreq_frequency_table freq_table[] = {
31 [0] = {
32 .index = 0,
33 .frequency = 200000,
34 },
35 [1] = {
36 .index = 1,
37 .frequency = 300000,
38 },
39 [2] = {
40 .index = 2,
41 .frequency = 600000,
42 },
43 [3] = {
44
45 .index = 3,
46 .frequency = CPUFREQ_TABLE_END,
47 },
48 [4] = {
49 .index = 4,
50 .frequency = CPUFREQ_TABLE_END,
51 },
52};
53
54static enum prcmu_cpu_opp index2opp[] = {
55 CPU_OPP_EXT_CLK,
56 CPU_OPP_50,
57 CPU_OPP_100,
58 CPU_OPP_MAX
59};
60
61static int u8500_cpufreq_verify_speed(struct cpufreq_policy *policy)
62{
63 return cpufreq_frequency_table_verify(policy, freq_table);
64}
65
66static int u8500_cpufreq_target(struct cpufreq_policy *policy,
67 unsigned int target_freq,
68 unsigned int relation)
69{
70 struct cpufreq_freqs freqs;
71 unsigned int index;
72 int ret = 0;
73
74
75
76
77
78 if (target_freq < policy->cpuinfo.min_freq)
79 target_freq = policy->cpuinfo.min_freq;
80 if (target_freq > policy->cpuinfo.max_freq)
81 target_freq = policy->cpuinfo.max_freq;
82
83 ret = cpufreq_frequency_table_target(policy, freq_table,
84 target_freq, relation, &index);
85 if (ret < 0) {
86 dev_err(dev, "Could not look up next frequency\n");
87 return ret;
88 }
89
90 freqs.old = policy->cur;
91 freqs.new = freq_table[index].frequency;
92 freqs.cpu = policy->cpu;
93
94 if (freqs.old == freqs.new) {
95 dev_dbg(dev, "Current and target frequencies are equal\n");
96 return 0;
97 }
98
99 dev_dbg(dev, "transition: %u --> %u\n", freqs.old, freqs.new);
100 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
101
102 ret = prcmu_set_cpu_opp(index2opp[index]);
103 if (ret < 0) {
104 dev_err(dev, "Failed to set OPP level\n");
105 return ret;
106 }
107
108 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
109
110 return ret;
111}
112
113static unsigned int u8500_cpufreq_getspeed(unsigned int cpu)
114{
115 int i;
116
117 for (i = 0; prcmu_get_cpu_opp() != index2opp[i]; i++)
118 ;
119 return freq_table[i].frequency;
120}
121
122static int __cpuinit u8500_cpu_init(struct cpufreq_policy *policy)
123{
124 int res;
125
126 BUILD_BUG_ON(ARRAY_SIZE(index2opp) + 1 != ARRAY_SIZE(freq_table));
127
128 if (cpu_is_u8500v2()) {
129 freq_table[1].frequency = 400000;
130 freq_table[2].frequency = 800000;
131 if (prcmu_has_arm_maxopp())
132 freq_table[3].frequency = 1000000;
133 }
134
135
136 res = cpufreq_frequency_table_cpuinfo(policy, freq_table);
137 if (!res)
138 cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
139 else {
140 dev_err(dev, "u8500-cpufreq : Failed to read policy table\n");
141 return res;
142 }
143
144 policy->min = policy->cpuinfo.min_freq;
145 policy->max = policy->cpuinfo.max_freq;
146 policy->cur = u8500_cpufreq_getspeed(policy->cpu);
147 policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
148
149
150
151
152
153
154 policy->cpuinfo.transition_latency = 200 * 1000;
155
156
157 cpumask_copy(policy->cpus, &cpu_present_map);
158
159 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
160
161 return res;
162}
163
164static struct freq_attr *u8500_cpufreq_attr[] = {
165 &cpufreq_freq_attr_scaling_available_freqs,
166 NULL,
167};
168static int u8500_cpu_exit(struct cpufreq_policy *policy)
169{
170 cpufreq_frequency_table_put_attr(policy->cpu);
171 return 0;
172}
173
174static struct cpufreq_driver u8500_driver = {
175 .owner = THIS_MODULE,
176 .flags = CPUFREQ_STICKY,
177 .verify = u8500_cpufreq_verify_speed,
178 .target = u8500_cpufreq_target,
179 .get = u8500_cpufreq_getspeed,
180 .init = u8500_cpu_init,
181 .exit = u8500_cpu_exit,
182 .name = CPUFREQ_NAME,
183 .attr = u8500_cpufreq_attr,
184};
185
186static int __init u8500_cpufreq_probe(struct platform_device *pdev)
187{
188 dev = &pdev->dev;
189 return cpufreq_register_driver(&u8500_driver);
190}
191
192static int __exit u8500_cpufreq_remove(struct platform_device *pdev)
193{
194 return cpufreq_unregister_driver(&u8500_driver);
195}
196
197static struct platform_driver u8500_cpufreq_driver = {
198 .driver = {
199 .name = DRIVER_NAME,
200 .owner = THIS_MODULE,
201 },
202 .remove = __exit_p(u8500_cpufreq_remove),
203};
204
205static int __init u8500_cpufreq_init(void)
206{
207 return platform_driver_probe(&u8500_cpufreq_driver,
208 &u8500_cpufreq_probe);
209}
210
211device_initcall(u8500_cpufreq_init);
212
