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a125a17f JL |
1 | /* |
2 | * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd. | |
3 | * http://www.samsung.com | |
4 | * | |
5 | * EXYNOS - CPU frequency scaling support for EXYNOS series | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
a125a17f JL |
12 | #include <linux/kernel.h> |
13 | #include <linux/err.h> | |
14 | #include <linux/clk.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/regulator/consumer.h> | |
18 | #include <linux/cpufreq.h> | |
d568b6f7 | 19 | #include <linux/platform_device.h> |
a125a17f | 20 | |
6c523c61 | 21 | #include <plat/cpu.h> |
a125a17f | 22 | |
c4aaa295 KK |
23 | #include "exynos-cpufreq.h" |
24 | ||
a125a17f | 25 | static struct exynos_dvfs_info *exynos_info; |
a125a17f | 26 | static struct regulator *arm_regulator; |
a125a17f | 27 | static unsigned int locking_frequency; |
a125a17f | 28 | |
0e0e425f JC |
29 | static int exynos_cpufreq_get_index(unsigned int freq) |
30 | { | |
31 | struct cpufreq_frequency_table *freq_table = exynos_info->freq_table; | |
32 | int index; | |
33 | ||
34 | for (index = 0; | |
35 | freq_table[index].frequency != CPUFREQ_TABLE_END; index++) | |
36 | if (freq_table[index].frequency == freq) | |
37 | break; | |
38 | ||
39 | if (freq_table[index].frequency == CPUFREQ_TABLE_END) | |
40 | return -EINVAL; | |
41 | ||
42 | return index; | |
43 | } | |
44 | ||
45 | static int exynos_cpufreq_scale(unsigned int target_freq) | |
a125a17f | 46 | { |
a125a17f JL |
47 | struct cpufreq_frequency_table *freq_table = exynos_info->freq_table; |
48 | unsigned int *volt_table = exynos_info->volt_table; | |
0e0e425f JC |
49 | struct cpufreq_policy *policy = cpufreq_cpu_get(0); |
50 | unsigned int arm_volt, safe_arm_volt = 0; | |
a125a17f | 51 | unsigned int mpll_freq_khz = exynos_info->mpll_freq_khz; |
d4019f0a | 52 | unsigned int old_freq; |
d271d077 | 53 | int index, old_index; |
0e0e425f | 54 | int ret = 0; |
a125a17f | 55 | |
d4019f0a | 56 | old_freq = policy->cur; |
a125a17f | 57 | |
53df1ad5 JL |
58 | /* |
59 | * The policy max have been changed so that we cannot get proper | |
60 | * old_index with cpufreq_frequency_table_target(). Thus, ignore | |
0585123e | 61 | * policy and get the index from the raw frequency table. |
53df1ad5 | 62 | */ |
d4019f0a | 63 | old_index = exynos_cpufreq_get_index(old_freq); |
0e0e425f JC |
64 | if (old_index < 0) { |
65 | ret = old_index; | |
a125a17f JL |
66 | goto out; |
67 | } | |
68 | ||
0e0e425f JC |
69 | index = exynos_cpufreq_get_index(target_freq); |
70 | if (index < 0) { | |
71 | ret = index; | |
a125a17f JL |
72 | goto out; |
73 | } | |
74 | ||
a125a17f JL |
75 | /* |
76 | * ARM clock source will be changed APLL to MPLL temporary | |
77 | * To support this level, need to control regulator for | |
78 | * required voltage level | |
79 | */ | |
80 | if (exynos_info->need_apll_change != NULL) { | |
81 | if (exynos_info->need_apll_change(old_index, index) && | |
82 | (freq_table[index].frequency < mpll_freq_khz) && | |
83 | (freq_table[old_index].frequency < mpll_freq_khz)) | |
84 | safe_arm_volt = volt_table[exynos_info->pll_safe_idx]; | |
85 | } | |
86 | arm_volt = volt_table[index]; | |
87 | ||
a125a17f | 88 | /* When the new frequency is higher than current frequency */ |
d4019f0a | 89 | if ((target_freq > old_freq) && !safe_arm_volt) { |
a125a17f | 90 | /* Firstly, voltage up to increase frequency */ |
0e0e425f JC |
91 | ret = regulator_set_voltage(arm_regulator, arm_volt, arm_volt); |
92 | if (ret) { | |
93 | pr_err("%s: failed to set cpu voltage to %d\n", | |
94 | __func__, arm_volt); | |
d4019f0a | 95 | return ret; |
0e0e425f | 96 | } |
a125a17f JL |
97 | } |
98 | ||
0e0e425f JC |
99 | if (safe_arm_volt) { |
100 | ret = regulator_set_voltage(arm_regulator, safe_arm_volt, | |
a125a17f | 101 | safe_arm_volt); |
0e0e425f JC |
102 | if (ret) { |
103 | pr_err("%s: failed to set cpu voltage to %d\n", | |
104 | __func__, safe_arm_volt); | |
d4019f0a | 105 | return ret; |
0e0e425f JC |
106 | } |
107 | } | |
857d90f7 JC |
108 | |
109 | exynos_info->set_freq(old_index, index); | |
a125a17f | 110 | |
a125a17f | 111 | /* When the new frequency is lower than current frequency */ |
d4019f0a VK |
112 | if ((target_freq < old_freq) || |
113 | ((target_freq > old_freq) && safe_arm_volt)) { | |
a125a17f | 114 | /* down the voltage after frequency change */ |
006454ae | 115 | ret = regulator_set_voltage(arm_regulator, arm_volt, |
a125a17f | 116 | arm_volt); |
0e0e425f JC |
117 | if (ret) { |
118 | pr_err("%s: failed to set cpu voltage to %d\n", | |
119 | __func__, arm_volt); | |
120 | goto out; | |
121 | } | |
a125a17f JL |
122 | } |
123 | ||
0e0e425f | 124 | out: |
0e0e425f JC |
125 | cpufreq_cpu_put(policy); |
126 | ||
127 | return ret; | |
128 | } | |
129 | ||
9c0ebcf7 | 130 | static int exynos_target(struct cpufreq_policy *policy, unsigned int index) |
0e0e425f | 131 | { |
d248bb89 | 132 | return exynos_cpufreq_scale(exynos_info->freq_table[index].frequency); |
a125a17f JL |
133 | } |
134 | ||
a125a17f JL |
135 | static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy) |
136 | { | |
652ed95d | 137 | policy->clk = exynos_info->cpu_clk; |
d248bb89 | 138 | policy->suspend_freq = locking_frequency; |
b249abae | 139 | return cpufreq_generic_init(policy, exynos_info->freq_table, 100000); |
a125a17f JL |
140 | } |
141 | ||
142 | static struct cpufreq_driver exynos_driver = { | |
ae6b4271 | 143 | .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK, |
eea6181e | 144 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 145 | .target_index = exynos_target, |
652ed95d | 146 | .get = cpufreq_generic_get, |
a125a17f JL |
147 | .init = exynos_cpufreq_cpu_init, |
148 | .name = "exynos_cpufreq", | |
eea6181e | 149 | .attr = cpufreq_generic_attr, |
c683c2c9 LM |
150 | #ifdef CONFIG_ARM_EXYNOS_CPU_FREQ_BOOST_SW |
151 | .boost_supported = true, | |
152 | #endif | |
a125a17f | 153 | #ifdef CONFIG_PM |
d248bb89 | 154 | .suspend = cpufreq_generic_suspend, |
a125a17f JL |
155 | #endif |
156 | }; | |
157 | ||
d568b6f7 | 158 | static int exynos_cpufreq_probe(struct platform_device *pdev) |
a125a17f JL |
159 | { |
160 | int ret = -EINVAL; | |
161 | ||
d5b73cd8 | 162 | exynos_info = kzalloc(sizeof(*exynos_info), GFP_KERNEL); |
a125a17f JL |
163 | if (!exynos_info) |
164 | return -ENOMEM; | |
165 | ||
166 | if (soc_is_exynos4210()) | |
167 | ret = exynos4210_cpufreq_init(exynos_info); | |
a35c5051 JL |
168 | else if (soc_is_exynos4212() || soc_is_exynos4412()) |
169 | ret = exynos4x12_cpufreq_init(exynos_info); | |
562a6cbe JL |
170 | else if (soc_is_exynos5250()) |
171 | ret = exynos5250_cpufreq_init(exynos_info); | |
a125a17f | 172 | else |
c1585207 | 173 | return 0; |
a125a17f JL |
174 | |
175 | if (ret) | |
176 | goto err_vdd_arm; | |
177 | ||
178 | if (exynos_info->set_freq == NULL) { | |
179 | pr_err("%s: No set_freq function (ERR)\n", __func__); | |
180 | goto err_vdd_arm; | |
181 | } | |
182 | ||
183 | arm_regulator = regulator_get(NULL, "vdd_arm"); | |
184 | if (IS_ERR(arm_regulator)) { | |
185 | pr_err("%s: failed to get resource vdd_arm\n", __func__); | |
186 | goto err_vdd_arm; | |
187 | } | |
188 | ||
d248bb89 | 189 | /* Done here as we want to capture boot frequency */ |
652ed95d | 190 | locking_frequency = clk_get_rate(exynos_info->cpu_clk) / 1000; |
6e45eb12 | 191 | |
d248bb89 VK |
192 | if (!cpufreq_register_driver(&exynos_driver)) |
193 | return 0; | |
a125a17f | 194 | |
d248bb89 | 195 | pr_err("%s: failed to register cpufreq driver\n", __func__); |
184cddd1 | 196 | regulator_put(arm_regulator); |
a125a17f JL |
197 | err_vdd_arm: |
198 | kfree(exynos_info); | |
a125a17f JL |
199 | return -EINVAL; |
200 | } | |
d568b6f7 LM |
201 | |
202 | static struct platform_driver exynos_cpufreq_platdrv = { | |
203 | .driver = { | |
204 | .name = "exynos-cpufreq", | |
205 | .owner = THIS_MODULE, | |
206 | }, | |
207 | .probe = exynos_cpufreq_probe, | |
208 | }; | |
209 | module_platform_driver(exynos_cpufreq_platdrv); |