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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2001-2002 Deep Blue Solutions Ltd. |
3 | * | |
1da177e4 LT |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * CPU support functions | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/cpufreq.h> | |
1da177e4 LT |
14 | #include <linux/sched.h> |
15 | #include <linux/smp.h> | |
16 | #include <linux/init.h> | |
fced80c7 | 17 | #include <linux/io.h> |
1da177e4 | 18 | |
a09e64fb | 19 | #include <mach/hardware.h> |
a285edcf | 20 | #include <mach/platform.h> |
1da177e4 | 21 | #include <asm/mach-types.h> |
c5a0adb5 | 22 | #include <asm/hardware/icst.h> |
1da177e4 LT |
23 | |
24 | static struct cpufreq_driver integrator_driver; | |
25 | ||
b7a3f8db AB |
26 | #define CM_ID __io_address(INTEGRATOR_HDR_ID) |
27 | #define CM_OSC __io_address(INTEGRATOR_HDR_OSC) | |
28 | #define CM_STAT __io_address(INTEGRATOR_HDR_STAT) | |
29 | #define CM_LOCK __io_address(INTEGRATOR_HDR_LOCK) | |
1da177e4 | 30 | |
39c0cb02 | 31 | static const struct icst_params lclk_params = { |
64fceb1d | 32 | .ref = 24000000, |
4de2edbd | 33 | .vco_max = ICST525_VCO_MAX_5V, |
e73a46a3 | 34 | .vco_min = ICST525_VCO_MIN, |
1da177e4 LT |
35 | .vd_min = 8, |
36 | .vd_max = 132, | |
37 | .rd_min = 24, | |
38 | .rd_max = 24, | |
232eaf7f RK |
39 | .s2div = icst525_s2div, |
40 | .idx2s = icst525_idx2s, | |
1da177e4 LT |
41 | }; |
42 | ||
39c0cb02 | 43 | static const struct icst_params cclk_params = { |
64fceb1d | 44 | .ref = 24000000, |
4de2edbd | 45 | .vco_max = ICST525_VCO_MAX_5V, |
e73a46a3 | 46 | .vco_min = ICST525_VCO_MIN, |
1da177e4 LT |
47 | .vd_min = 12, |
48 | .vd_max = 160, | |
49 | .rd_min = 24, | |
50 | .rd_max = 24, | |
232eaf7f RK |
51 | .s2div = icst525_s2div, |
52 | .idx2s = icst525_idx2s, | |
1da177e4 LT |
53 | }; |
54 | ||
55 | /* | |
56 | * Validate the speed policy. | |
57 | */ | |
58 | static int integrator_verify_policy(struct cpufreq_policy *policy) | |
59 | { | |
39c0cb02 | 60 | struct icst_vco vco; |
1da177e4 LT |
61 | |
62 | cpufreq_verify_within_limits(policy, | |
63 | policy->cpuinfo.min_freq, | |
64 | policy->cpuinfo.max_freq); | |
65 | ||
c5a0adb5 RK |
66 | vco = icst_hz_to_vco(&cclk_params, policy->max * 1000); |
67 | policy->max = icst_hz(&cclk_params, vco) / 1000; | |
1da177e4 | 68 | |
c5a0adb5 RK |
69 | vco = icst_hz_to_vco(&cclk_params, policy->min * 1000); |
70 | policy->min = icst_hz(&cclk_params, vco) / 1000; | |
1da177e4 LT |
71 | |
72 | cpufreq_verify_within_limits(policy, | |
73 | policy->cpuinfo.min_freq, | |
74 | policy->cpuinfo.max_freq); | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | ||
80 | static int integrator_set_target(struct cpufreq_policy *policy, | |
81 | unsigned int target_freq, | |
82 | unsigned int relation) | |
83 | { | |
84 | cpumask_t cpus_allowed; | |
85 | int cpu = policy->cpu; | |
39c0cb02 | 86 | struct icst_vco vco; |
1da177e4 LT |
87 | struct cpufreq_freqs freqs; |
88 | u_int cm_osc; | |
89 | ||
90 | /* | |
91 | * Save this threads cpus_allowed mask. | |
92 | */ | |
93 | cpus_allowed = current->cpus_allowed; | |
94 | ||
95 | /* | |
96 | * Bind to the specified CPU. When this call returns, | |
97 | * we should be running on the right CPU. | |
98 | */ | |
99 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
100 | BUG_ON(cpu != smp_processor_id()); | |
101 | ||
102 | /* get current setting */ | |
103 | cm_osc = __raw_readl(CM_OSC); | |
104 | ||
105 | if (machine_is_integrator()) { | |
106 | vco.s = (cm_osc >> 8) & 7; | |
107 | } else if (machine_is_cintegrator()) { | |
108 | vco.s = 1; | |
109 | } | |
110 | vco.v = cm_osc & 255; | |
111 | vco.r = 22; | |
c5a0adb5 | 112 | freqs.old = icst_hz(&cclk_params, vco) / 1000; |
1da177e4 | 113 | |
c5a0adb5 | 114 | /* icst_hz_to_vco rounds down -- so we need the next |
1da177e4 LT |
115 | * larger freq in case of CPUFREQ_RELATION_L. |
116 | */ | |
117 | if (relation == CPUFREQ_RELATION_L) | |
118 | target_freq += 999; | |
119 | if (target_freq > policy->max) | |
120 | target_freq = policy->max; | |
c5a0adb5 RK |
121 | vco = icst_hz_to_vco(&cclk_params, target_freq * 1000); |
122 | freqs.new = icst_hz(&cclk_params, vco) / 1000; | |
1da177e4 | 123 | |
1da177e4 LT |
124 | if (freqs.old == freqs.new) { |
125 | set_cpus_allowed(current, cpus_allowed); | |
126 | return 0; | |
127 | } | |
128 | ||
b43a7ffb | 129 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); |
1da177e4 LT |
130 | |
131 | cm_osc = __raw_readl(CM_OSC); | |
132 | ||
133 | if (machine_is_integrator()) { | |
134 | cm_osc &= 0xfffff800; | |
135 | cm_osc |= vco.s << 8; | |
136 | } else if (machine_is_cintegrator()) { | |
137 | cm_osc &= 0xffffff00; | |
138 | } | |
139 | cm_osc |= vco.v; | |
140 | ||
141 | __raw_writel(0xa05f, CM_LOCK); | |
142 | __raw_writel(cm_osc, CM_OSC); | |
143 | __raw_writel(0, CM_LOCK); | |
144 | ||
145 | /* | |
146 | * Restore the CPUs allowed mask. | |
147 | */ | |
148 | set_cpus_allowed(current, cpus_allowed); | |
149 | ||
b43a7ffb | 150 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); |
1da177e4 LT |
151 | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static unsigned int integrator_get(unsigned int cpu) | |
156 | { | |
157 | cpumask_t cpus_allowed; | |
158 | unsigned int current_freq; | |
159 | u_int cm_osc; | |
39c0cb02 | 160 | struct icst_vco vco; |
1da177e4 LT |
161 | |
162 | cpus_allowed = current->cpus_allowed; | |
163 | ||
164 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
165 | BUG_ON(cpu != smp_processor_id()); | |
166 | ||
167 | /* detect memory etc. */ | |
168 | cm_osc = __raw_readl(CM_OSC); | |
169 | ||
170 | if (machine_is_integrator()) { | |
171 | vco.s = (cm_osc >> 8) & 7; | |
1aa023b8 | 172 | } else { |
1da177e4 LT |
173 | vco.s = 1; |
174 | } | |
175 | vco.v = cm_osc & 255; | |
176 | vco.r = 22; | |
177 | ||
c5a0adb5 | 178 | current_freq = icst_hz(&cclk_params, vco) / 1000; /* current freq */ |
1da177e4 LT |
179 | |
180 | set_cpus_allowed(current, cpus_allowed); | |
181 | ||
182 | return current_freq; | |
183 | } | |
184 | ||
185 | static int integrator_cpufreq_init(struct cpufreq_policy *policy) | |
186 | { | |
187 | ||
188 | /* set default policy and cpuinfo */ | |
1da177e4 LT |
189 | policy->cpuinfo.max_freq = 160000; |
190 | policy->cpuinfo.min_freq = 12000; | |
191 | policy->cpuinfo.transition_latency = 1000000; /* 1 ms, assumed */ | |
192 | policy->cur = policy->min = policy->max = integrator_get(policy->cpu); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static struct cpufreq_driver integrator_driver = { | |
198 | .verify = integrator_verify_policy, | |
199 | .target = integrator_set_target, | |
200 | .get = integrator_get, | |
201 | .init = integrator_cpufreq_init, | |
202 | .name = "integrator", | |
203 | }; | |
204 | ||
205 | static int __init integrator_cpu_init(void) | |
206 | { | |
207 | return cpufreq_register_driver(&integrator_driver); | |
208 | } | |
209 | ||
210 | static void __exit integrator_cpu_exit(void) | |
211 | { | |
212 | cpufreq_unregister_driver(&integrator_driver); | |
213 | } | |
214 | ||
215 | MODULE_AUTHOR ("Russell M. King"); | |
216 | MODULE_DESCRIPTION ("cpufreq driver for ARM Integrator CPUs"); | |
217 | MODULE_LICENSE ("GPL"); | |
218 | ||
219 | module_init(integrator_cpu_init); | |
220 | module_exit(integrator_cpu_exit); |