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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> |
bdac7eac LW |
18 | #include <linux/platform_device.h> |
19 | #include <linux/of.h> | |
20 | #include <linux/of_address.h> | |
1da177e4 | 21 | |
1da177e4 | 22 | #include <asm/mach-types.h> |
c5a0adb5 | 23 | #include <asm/hardware/icst.h> |
1da177e4 | 24 | |
bdac7eac LW |
25 | static void __iomem *cm_base; |
26 | /* The cpufreq driver only use the OSC register */ | |
27 | #define INTEGRATOR_HDR_OSC_OFFSET 0x08 | |
28 | #define INTEGRATOR_HDR_LOCK_OFFSET 0x14 | |
1da177e4 | 29 | |
bdac7eac | 30 | static struct cpufreq_driver integrator_driver; |
1da177e4 | 31 | |
39c0cb02 | 32 | static const struct icst_params lclk_params = { |
64fceb1d | 33 | .ref = 24000000, |
4de2edbd | 34 | .vco_max = ICST525_VCO_MAX_5V, |
e73a46a3 | 35 | .vco_min = ICST525_VCO_MIN, |
1da177e4 LT |
36 | .vd_min = 8, |
37 | .vd_max = 132, | |
38 | .rd_min = 24, | |
39 | .rd_max = 24, | |
232eaf7f RK |
40 | .s2div = icst525_s2div, |
41 | .idx2s = icst525_idx2s, | |
1da177e4 LT |
42 | }; |
43 | ||
39c0cb02 | 44 | static const struct icst_params cclk_params = { |
64fceb1d | 45 | .ref = 24000000, |
4de2edbd | 46 | .vco_max = ICST525_VCO_MAX_5V, |
e73a46a3 | 47 | .vco_min = ICST525_VCO_MIN, |
1da177e4 LT |
48 | .vd_min = 12, |
49 | .vd_max = 160, | |
50 | .rd_min = 24, | |
51 | .rd_max = 24, | |
232eaf7f RK |
52 | .s2div = icst525_s2div, |
53 | .idx2s = icst525_idx2s, | |
1da177e4 LT |
54 | }; |
55 | ||
56 | /* | |
57 | * Validate the speed policy. | |
58 | */ | |
59 | static int integrator_verify_policy(struct cpufreq_policy *policy) | |
60 | { | |
39c0cb02 | 61 | struct icst_vco vco; |
1da177e4 LT |
62 | |
63 | cpufreq_verify_within_limits(policy, | |
64 | policy->cpuinfo.min_freq, | |
65 | policy->cpuinfo.max_freq); | |
66 | ||
c5a0adb5 RK |
67 | vco = icst_hz_to_vco(&cclk_params, policy->max * 1000); |
68 | policy->max = icst_hz(&cclk_params, vco) / 1000; | |
1da177e4 | 69 | |
c5a0adb5 RK |
70 | vco = icst_hz_to_vco(&cclk_params, policy->min * 1000); |
71 | policy->min = icst_hz(&cclk_params, vco) / 1000; | |
1da177e4 LT |
72 | |
73 | cpufreq_verify_within_limits(policy, | |
74 | policy->cpuinfo.min_freq, | |
75 | policy->cpuinfo.max_freq); | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | ||
81 | static int integrator_set_target(struct cpufreq_policy *policy, | |
82 | unsigned int target_freq, | |
83 | unsigned int relation) | |
84 | { | |
85 | cpumask_t cpus_allowed; | |
86 | int cpu = policy->cpu; | |
39c0cb02 | 87 | struct icst_vco vco; |
1da177e4 LT |
88 | struct cpufreq_freqs freqs; |
89 | u_int cm_osc; | |
90 | ||
91 | /* | |
92 | * Save this threads cpus_allowed mask. | |
93 | */ | |
94 | cpus_allowed = current->cpus_allowed; | |
95 | ||
96 | /* | |
97 | * Bind to the specified CPU. When this call returns, | |
98 | * we should be running on the right CPU. | |
99 | */ | |
100 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
101 | BUG_ON(cpu != smp_processor_id()); | |
102 | ||
103 | /* get current setting */ | |
bdac7eac | 104 | cm_osc = __raw_readl(cm_base + INTEGRATOR_HDR_OSC_OFFSET); |
1da177e4 LT |
105 | |
106 | if (machine_is_integrator()) { | |
107 | vco.s = (cm_osc >> 8) & 7; | |
108 | } else if (machine_is_cintegrator()) { | |
109 | vco.s = 1; | |
110 | } | |
111 | vco.v = cm_osc & 255; | |
112 | vco.r = 22; | |
c5a0adb5 | 113 | freqs.old = icst_hz(&cclk_params, vco) / 1000; |
1da177e4 | 114 | |
c5a0adb5 | 115 | /* icst_hz_to_vco rounds down -- so we need the next |
1da177e4 LT |
116 | * larger freq in case of CPUFREQ_RELATION_L. |
117 | */ | |
118 | if (relation == CPUFREQ_RELATION_L) | |
119 | target_freq += 999; | |
120 | if (target_freq > policy->max) | |
121 | target_freq = policy->max; | |
c5a0adb5 RK |
122 | vco = icst_hz_to_vco(&cclk_params, target_freq * 1000); |
123 | freqs.new = icst_hz(&cclk_params, vco) / 1000; | |
1da177e4 | 124 | |
1da177e4 LT |
125 | if (freqs.old == freqs.new) { |
126 | set_cpus_allowed(current, cpus_allowed); | |
127 | return 0; | |
128 | } | |
129 | ||
b43a7ffb | 130 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); |
1da177e4 | 131 | |
bdac7eac | 132 | cm_osc = __raw_readl(cm_base + INTEGRATOR_HDR_OSC_OFFSET); |
1da177e4 LT |
133 | |
134 | if (machine_is_integrator()) { | |
135 | cm_osc &= 0xfffff800; | |
136 | cm_osc |= vco.s << 8; | |
137 | } else if (machine_is_cintegrator()) { | |
138 | cm_osc &= 0xffffff00; | |
139 | } | |
140 | cm_osc |= vco.v; | |
141 | ||
bdac7eac LW |
142 | __raw_writel(0xa05f, cm_base + INTEGRATOR_HDR_LOCK_OFFSET); |
143 | __raw_writel(cm_osc, cm_base + INTEGRATOR_HDR_OSC_OFFSET); | |
144 | __raw_writel(0, cm_base + INTEGRATOR_HDR_LOCK_OFFSET); | |
1da177e4 LT |
145 | |
146 | /* | |
147 | * Restore the CPUs allowed mask. | |
148 | */ | |
149 | set_cpus_allowed(current, cpus_allowed); | |
150 | ||
b43a7ffb | 151 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); |
1da177e4 LT |
152 | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static unsigned int integrator_get(unsigned int cpu) | |
157 | { | |
158 | cpumask_t cpus_allowed; | |
159 | unsigned int current_freq; | |
160 | u_int cm_osc; | |
39c0cb02 | 161 | struct icst_vco vco; |
1da177e4 LT |
162 | |
163 | cpus_allowed = current->cpus_allowed; | |
164 | ||
165 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
166 | BUG_ON(cpu != smp_processor_id()); | |
167 | ||
168 | /* detect memory etc. */ | |
bdac7eac | 169 | cm_osc = __raw_readl(cm_base + INTEGRATOR_HDR_OSC_OFFSET); |
1da177e4 LT |
170 | |
171 | if (machine_is_integrator()) { | |
172 | vco.s = (cm_osc >> 8) & 7; | |
1aa023b8 | 173 | } else { |
1da177e4 LT |
174 | vco.s = 1; |
175 | } | |
176 | vco.v = cm_osc & 255; | |
177 | vco.r = 22; | |
178 | ||
c5a0adb5 | 179 | current_freq = icst_hz(&cclk_params, vco) / 1000; /* current freq */ |
1da177e4 LT |
180 | |
181 | set_cpus_allowed(current, cpus_allowed); | |
182 | ||
183 | return current_freq; | |
184 | } | |
185 | ||
186 | static int integrator_cpufreq_init(struct cpufreq_policy *policy) | |
187 | { | |
188 | ||
189 | /* set default policy and cpuinfo */ | |
1da177e4 LT |
190 | policy->cpuinfo.max_freq = 160000; |
191 | policy->cpuinfo.min_freq = 12000; | |
192 | policy->cpuinfo.transition_latency = 1000000; /* 1 ms, assumed */ | |
193 | policy->cur = policy->min = policy->max = integrator_get(policy->cpu); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static struct cpufreq_driver integrator_driver = { | |
199 | .verify = integrator_verify_policy, | |
200 | .target = integrator_set_target, | |
201 | .get = integrator_get, | |
202 | .init = integrator_cpufreq_init, | |
203 | .name = "integrator", | |
204 | }; | |
205 | ||
bdac7eac | 206 | static int __init integrator_cpufreq_probe(struct platform_device *pdev) |
1da177e4 | 207 | { |
bdac7eac LW |
208 | struct resource *res; |
209 | ||
210 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
211 | if (!res) | |
212 | return -ENODEV; | |
213 | ||
214 | cm_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); | |
215 | if (!cm_base) | |
216 | return -ENODEV; | |
217 | ||
1da177e4 LT |
218 | return cpufreq_register_driver(&integrator_driver); |
219 | } | |
220 | ||
bdac7eac | 221 | static void __exit integrator_cpufreq_remove(struct platform_device *pdev) |
1da177e4 LT |
222 | { |
223 | cpufreq_unregister_driver(&integrator_driver); | |
224 | } | |
225 | ||
bdac7eac LW |
226 | static const struct of_device_id integrator_cpufreq_match[] = { |
227 | { .compatible = "arm,core-module-integrator"}, | |
228 | { }, | |
229 | }; | |
230 | ||
231 | static struct platform_driver integrator_cpufreq_driver = { | |
232 | .driver = { | |
233 | .name = "integrator-cpufreq", | |
234 | .owner = THIS_MODULE, | |
235 | .of_match_table = integrator_cpufreq_match, | |
236 | }, | |
237 | .remove = __exit_p(integrator_cpufreq_remove), | |
238 | }; | |
239 | ||
240 | module_platform_driver_probe(integrator_cpufreq_driver, | |
241 | integrator_cpufreq_probe); | |
242 | ||
1da177e4 LT |
243 | MODULE_AUTHOR ("Russell M. King"); |
244 | MODULE_DESCRIPTION ("cpufreq driver for ARM Integrator CPUs"); | |
245 | MODULE_LICENSE ("GPL"); |