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de6cc651 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2e0c3370 OJ |
2 | /* |
3 | * Copyright (C) 2007 PA Semi, Inc | |
4 | * | |
5 | * Authors: Egor Martovetsky <egor@pasemi.com> | |
6 | * Olof Johansson <olof@lixom.net> | |
7 | * | |
8 | * Maintained by: Olof Johansson <olof@lixom.net> | |
9 | * | |
10 | * Based on arch/powerpc/platforms/cell/cbe_cpufreq.c: | |
11 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 | |
2e0c3370 OJ |
12 | */ |
13 | ||
14 | #include <linux/cpufreq.h> | |
15 | #include <linux/timer.h> | |
7dfe293c | 16 | #include <linux/module.h> |
5af50730 | 17 | #include <linux/of_address.h> |
2e0c3370 OJ |
18 | |
19 | #include <asm/hw_irq.h> | |
20 | #include <asm/io.h> | |
21 | #include <asm/prom.h> | |
2abb7019 | 22 | #include <asm/time.h> |
8b32bc03 | 23 | #include <asm/smp.h> |
2e0c3370 | 24 | |
4a27aa9c LJ |
25 | #include <platforms/pasemi/pasemi.h> |
26 | ||
2e0c3370 OJ |
27 | #define SDCASR_REG 0x0100 |
28 | #define SDCASR_REG_STRIDE 0x1000 | |
29 | #define SDCPWR_CFGA0_REG 0x0100 | |
30 | #define SDCPWR_PWST0_REG 0x0000 | |
31 | #define SDCPWR_GIZTIME_REG 0x0440 | |
32 | ||
33 | /* SDCPWR_GIZTIME_REG fields */ | |
34 | #define SDCPWR_GIZTIME_GR 0x80000000 | |
35 | #define SDCPWR_GIZTIME_LONGLOCK 0x000000ff | |
36 | ||
37 | /* Offset of ASR registers from SDC base */ | |
38 | #define SDCASR_OFFSET 0x120000 | |
39 | ||
40 | static void __iomem *sdcpwr_mapbase; | |
41 | static void __iomem *sdcasr_mapbase; | |
42 | ||
2e0c3370 OJ |
43 | /* Current astate, is used when waking up from power savings on |
44 | * one core, in case the other core has switched states during | |
45 | * the idle time. | |
46 | */ | |
47 | static int current_astate; | |
48 | ||
49 | /* We support 5(A0-A4) power states excluding turbo(A5-A6) modes */ | |
50 | static struct cpufreq_frequency_table pas_freqs[] = { | |
7f4b0461 VK |
51 | {0, 0, 0}, |
52 | {0, 1, 0}, | |
53 | {0, 2, 0}, | |
54 | {0, 3, 0}, | |
55 | {0, 4, 0}, | |
56 | {0, 0, CPUFREQ_TABLE_END}, | |
2e0c3370 OJ |
57 | }; |
58 | ||
2e0c3370 OJ |
59 | /* |
60 | * hardware specific functions | |
61 | */ | |
62 | ||
63 | static int get_astate_freq(int astate) | |
64 | { | |
65 | u32 ret; | |
66 | ret = in_le32(sdcpwr_mapbase + SDCPWR_CFGA0_REG + (astate * 0x10)); | |
67 | ||
68 | return ret & 0x3f; | |
69 | } | |
70 | ||
71 | static int get_cur_astate(int cpu) | |
72 | { | |
73 | u32 ret; | |
74 | ||
75 | ret = in_le32(sdcpwr_mapbase + SDCPWR_PWST0_REG); | |
76 | ret = (ret >> (cpu * 4)) & 0x7; | |
77 | ||
78 | return ret; | |
79 | } | |
80 | ||
81 | static int get_gizmo_latency(void) | |
82 | { | |
83 | u32 giztime, ret; | |
84 | ||
85 | giztime = in_le32(sdcpwr_mapbase + SDCPWR_GIZTIME_REG); | |
86 | ||
87 | /* just provide the upper bound */ | |
88 | if (giztime & SDCPWR_GIZTIME_GR) | |
89 | ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 128000; | |
90 | else | |
91 | ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 1000; | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
96 | static void set_astate(int cpu, unsigned int astate) | |
97 | { | |
ac3f6454 | 98 | unsigned long flags; |
2e0c3370 OJ |
99 | |
100 | /* Return if called before init has run */ | |
101 | if (unlikely(!sdcasr_mapbase)) | |
102 | return; | |
103 | ||
104 | local_irq_save(flags); | |
105 | ||
106 | out_le32(sdcasr_mapbase + SDCASR_REG + SDCASR_REG_STRIDE*cpu, astate); | |
107 | ||
108 | local_irq_restore(flags); | |
109 | } | |
110 | ||
8b32bc03 OJ |
111 | int check_astate(void) |
112 | { | |
113 | return get_cur_astate(hard_smp_processor_id()); | |
114 | } | |
115 | ||
2e0c3370 OJ |
116 | void restore_astate(int cpu) |
117 | { | |
118 | set_astate(cpu, current_astate); | |
119 | } | |
120 | ||
121 | /* | |
122 | * cpufreq functions | |
123 | */ | |
124 | ||
125 | static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy) | |
126 | { | |
041526f9 | 127 | struct cpufreq_frequency_table *pos; |
12d371a6 SR |
128 | const u32 *max_freqp; |
129 | u32 max_freq; | |
ffd81dcf | 130 | int cur_astate, idx; |
2e0c3370 OJ |
131 | struct resource res; |
132 | struct device_node *cpu, *dn; | |
133 | int err = -ENODEV; | |
134 | ||
135 | cpu = of_get_cpu_node(policy->cpu, NULL); | |
e0a12445 WY |
136 | if (!cpu) |
137 | goto out; | |
2e0c3370 | 138 | |
e0a12445 | 139 | max_freqp = of_get_property(cpu, "clock-frequency", NULL); |
a9acc26b | 140 | of_node_put(cpu); |
e0a12445 WY |
141 | if (!max_freqp) { |
142 | err = -EINVAL; | |
2e0c3370 | 143 | goto out; |
e0a12445 WY |
144 | } |
145 | ||
146 | /* we need the freq in kHz */ | |
147 | max_freq = *max_freqp / 1000; | |
2e0c3370 | 148 | |
0d08a847 OJ |
149 | dn = of_find_compatible_node(NULL, NULL, "1682m-sdc"); |
150 | if (!dn) | |
151 | dn = of_find_compatible_node(NULL, NULL, | |
152 | "pasemi,pwrficient-sdc"); | |
2e0c3370 OJ |
153 | if (!dn) |
154 | goto out; | |
155 | err = of_address_to_resource(dn, 0, &res); | |
156 | of_node_put(dn); | |
157 | if (err) | |
158 | goto out; | |
159 | sdcasr_mapbase = ioremap(res.start + SDCASR_OFFSET, 0x2000); | |
160 | if (!sdcasr_mapbase) { | |
161 | err = -EINVAL; | |
162 | goto out; | |
163 | } | |
164 | ||
0d08a847 OJ |
165 | dn = of_find_compatible_node(NULL, NULL, "1682m-gizmo"); |
166 | if (!dn) | |
167 | dn = of_find_compatible_node(NULL, NULL, | |
168 | "pasemi,pwrficient-gizmo"); | |
2e0c3370 OJ |
169 | if (!dn) { |
170 | err = -ENODEV; | |
171 | goto out_unmap_sdcasr; | |
172 | } | |
173 | err = of_address_to_resource(dn, 0, &res); | |
174 | of_node_put(dn); | |
175 | if (err) | |
176 | goto out_unmap_sdcasr; | |
177 | sdcpwr_mapbase = ioremap(res.start, 0x1000); | |
178 | if (!sdcpwr_mapbase) { | |
179 | err = -EINVAL; | |
180 | goto out_unmap_sdcasr; | |
181 | } | |
182 | ||
183 | pr_debug("init cpufreq on CPU %d\n", policy->cpu); | |
12d371a6 | 184 | pr_debug("max clock-frequency is at %u kHz\n", max_freq); |
2e0c3370 OJ |
185 | pr_debug("initializing frequency table\n"); |
186 | ||
187 | /* initialize frequency table */ | |
ffd81dcf | 188 | cpufreq_for_each_entry_idx(pos, pas_freqs, idx) { |
041526f9 | 189 | pos->frequency = get_astate_freq(pos->driver_data) * 100000; |
ffd81dcf | 190 | pr_debug("%d: %d\n", idx, pos->frequency); |
2e0c3370 OJ |
191 | } |
192 | ||
2e0c3370 OJ |
193 | cur_astate = get_cur_astate(policy->cpu); |
194 | pr_debug("current astate is at %d\n",cur_astate); | |
195 | ||
196 | policy->cur = pas_freqs[cur_astate].frequency; | |
2abb7019 OJ |
197 | ppc_proc_freq = policy->cur * 1000ul; |
198 | ||
c4dcc8a1 VK |
199 | cpufreq_generic_init(policy, pas_freqs, get_gizmo_latency()); |
200 | return 0; | |
2e0c3370 | 201 | |
2e0c3370 OJ |
202 | out_unmap_sdcasr: |
203 | iounmap(sdcasr_mapbase); | |
204 | out: | |
205 | return err; | |
206 | } | |
207 | ||
208 | static int pas_cpufreq_cpu_exit(struct cpufreq_policy *policy) | |
209 | { | |
72640d88 SR |
210 | /* |
211 | * We don't support CPU hotplug. Don't unmap after the system | |
212 | * has already made it to a running state. | |
213 | */ | |
d04e31a2 | 214 | if (system_state >= SYSTEM_RUNNING) |
72640d88 SR |
215 | return 0; |
216 | ||
2e0c3370 OJ |
217 | if (sdcasr_mapbase) |
218 | iounmap(sdcasr_mapbase); | |
219 | if (sdcpwr_mapbase) | |
220 | iounmap(sdcpwr_mapbase); | |
221 | ||
2e0c3370 OJ |
222 | return 0; |
223 | } | |
224 | ||
2e0c3370 | 225 | static int pas_cpufreq_target(struct cpufreq_policy *policy, |
9c0ebcf7 | 226 | unsigned int pas_astate_new) |
2e0c3370 | 227 | { |
2e0c3370 OJ |
228 | int i; |
229 | ||
2e0c3370 OJ |
230 | pr_debug("setting frequency for cpu %d to %d kHz, 1/%d of max frequency\n", |
231 | policy->cpu, | |
232 | pas_freqs[pas_astate_new].frequency, | |
50701588 | 233 | pas_freqs[pas_astate_new].driver_data); |
2e0c3370 OJ |
234 | |
235 | current_astate = pas_astate_new; | |
236 | ||
237 | for_each_online_cpu(i) | |
238 | set_astate(i, pas_astate_new); | |
239 | ||
d4019f0a | 240 | ppc_proc_freq = pas_freqs[pas_astate_new].frequency * 1000ul; |
2e0c3370 OJ |
241 | return 0; |
242 | } | |
243 | ||
244 | static struct cpufreq_driver pas_cpufreq_driver = { | |
245 | .name = "pas-cpufreq", | |
2e0c3370 OJ |
246 | .flags = CPUFREQ_CONST_LOOPS, |
247 | .init = pas_cpufreq_cpu_init, | |
248 | .exit = pas_cpufreq_cpu_exit, | |
57174310 | 249 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 250 | .target_index = pas_cpufreq_target, |
57174310 | 251 | .attr = cpufreq_generic_attr, |
2e0c3370 OJ |
252 | }; |
253 | ||
254 | /* | |
255 | * module init and destoy | |
256 | */ | |
257 | ||
258 | static int __init pas_cpufreq_init(void) | |
259 | { | |
71a157e8 GL |
260 | if (!of_machine_is_compatible("PA6T-1682M") && |
261 | !of_machine_is_compatible("pasemi,pwrficient")) | |
2e0c3370 OJ |
262 | return -ENODEV; |
263 | ||
264 | return cpufreq_register_driver(&pas_cpufreq_driver); | |
265 | } | |
266 | ||
267 | static void __exit pas_cpufreq_exit(void) | |
268 | { | |
269 | cpufreq_unregister_driver(&pas_cpufreq_driver); | |
270 | } | |
271 | ||
272 | module_init(pas_cpufreq_init); | |
273 | module_exit(pas_cpufreq_exit); | |
274 | ||
275 | MODULE_LICENSE("GPL"); | |
276 | MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>, Olof Johansson <olof@lixom.net>"); |