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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9e2697ff | 2 | /* |
9e2697ff RK |
3 | * Copyright (C) 2002,2003 Intrinsyc Software |
4 | * | |
9e2697ff RK |
5 | * History: |
6 | * 31-Jul-2002 : Initial version [FB] | |
7 | * 29-Jan-2003 : added PXA255 support [FB] | |
8 | * 20-Apr-2003 : ported to v2.5 (Dustin McIntire, Sensoria Corp.) | |
9 | * | |
10 | * Note: | |
11 | * This driver may change the memory bus clock rate, but will not do any | |
12 | * platform specific access timing changes... for example if you have flash | |
13 | * memory connected to CS0, you will need to register a platform specific | |
14 | * notifier which will adjust the memory access strobes to maintain a | |
15 | * minimum strobe width. | |
9e2697ff RK |
16 | */ |
17 | ||
1c5864e2 JP |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
9e2697ff RK |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/cpufreq.h> | |
3dbeef23 RJ |
25 | #include <linux/err.h> |
26 | #include <linux/regulator/consumer.h> | |
ad68bb9f | 27 | #include <linux/io.h> |
9e2697ff | 28 | |
a09e64fb | 29 | #include <mach/pxa2xx-regs.h> |
ad68bb9f | 30 | #include <mach/smemc.h> |
9e2697ff RK |
31 | |
32 | #ifdef DEBUG | |
33 | static unsigned int freq_debug; | |
c710e39c | 34 | module_param(freq_debug, uint, 0); |
9e2697ff RK |
35 | MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0"); |
36 | #else | |
37 | #define freq_debug 0 | |
38 | #endif | |
39 | ||
3dbeef23 RJ |
40 | static struct regulator *vcc_core; |
41 | ||
592eb999 RJ |
42 | static unsigned int pxa27x_maxfreq; |
43 | module_param(pxa27x_maxfreq, uint, 0); | |
44 | MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz" | |
45 | "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)"); | |
46 | ||
d9278077 RJ |
47 | struct pxa_cpufreq_data { |
48 | struct clk *clk_core; | |
49 | }; | |
50 | static struct pxa_cpufreq_data pxa_cpufreq_data; | |
51 | ||
52352558 | 52 | struct pxa_freqs { |
9e2697ff | 53 | unsigned int khz; |
3dbeef23 RJ |
54 | int vmin; |
55 | int vmax; | |
52352558 | 56 | }; |
9e2697ff | 57 | |
592eb999 RJ |
58 | /* |
59 | * PXA255 definitions | |
60 | */ | |
03c22990 | 61 | static const struct pxa_freqs pxa255_run_freqs[] = |
9e2697ff | 62 | { |
d9278077 RJ |
63 | /* CPU MEMBUS run turbo PXbus SDRAM */ |
64 | { 99500, -1, -1}, /* 99, 99, 50, 50 */ | |
65 | {132700, -1, -1}, /* 133, 133, 66, 66 */ | |
66 | {199100, -1, -1}, /* 199, 199, 99, 99 */ | |
67 | {265400, -1, -1}, /* 265, 265, 133, 66 */ | |
68 | {331800, -1, -1}, /* 331, 331, 166, 83 */ | |
69 | {398100, -1, -1}, /* 398, 398, 196, 99 */ | |
9e2697ff | 70 | }; |
9e2697ff RK |
71 | |
72 | /* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */ | |
03c22990 | 73 | static const struct pxa_freqs pxa255_turbo_freqs[] = |
9e2697ff | 74 | { |
d9278077 RJ |
75 | /* CPU run turbo PXbus SDRAM */ |
76 | { 99500, -1, -1}, /* 99, 99, 50, 50 */ | |
77 | {199100, -1, -1}, /* 99, 199, 50, 99 */ | |
78 | {298500, -1, -1}, /* 99, 287, 50, 99 */ | |
79 | {298600, -1, -1}, /* 199, 287, 99, 99 */ | |
80 | {398100, -1, -1}, /* 199, 398, 99, 99 */ | |
9e2697ff | 81 | }; |
9e2697ff | 82 | |
592eb999 RJ |
83 | #define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs) |
84 | #define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs) | |
85 | ||
86 | static struct cpufreq_frequency_table | |
87 | pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1]; | |
3679389b | 88 | static struct cpufreq_frequency_table |
592eb999 RJ |
89 | pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1]; |
90 | ||
65587f7d MZ |
91 | static unsigned int pxa255_turbo_table; |
92 | module_param(pxa255_turbo_table, uint, 0); | |
93 | MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)"); | |
94 | ||
52352558 | 95 | static struct pxa_freqs pxa27x_freqs[] = { |
d9278077 RJ |
96 | {104000, 900000, 1705000 }, |
97 | {156000, 1000000, 1705000 }, | |
98 | {208000, 1180000, 1705000 }, | |
99 | {312000, 1250000, 1705000 }, | |
100 | {416000, 1350000, 1705000 }, | |
101 | {520000, 1450000, 1705000 }, | |
102 | {624000, 1550000, 1705000 } | |
592eb999 RJ |
103 | }; |
104 | ||
105 | #define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs) | |
106 | static struct cpufreq_frequency_table | |
107 | pxa27x_freq_table[NUM_PXA27x_FREQS+1]; | |
9e2697ff RK |
108 | |
109 | extern unsigned get_clk_frequency_khz(int info); | |
110 | ||
3dbeef23 RJ |
111 | #ifdef CONFIG_REGULATOR |
112 | ||
03c22990 | 113 | static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq) |
3dbeef23 RJ |
114 | { |
115 | int ret = 0; | |
116 | int vmin, vmax; | |
117 | ||
118 | if (!cpu_is_pxa27x()) | |
119 | return 0; | |
120 | ||
121 | vmin = pxa_freq->vmin; | |
122 | vmax = pxa_freq->vmax; | |
123 | if ((vmin == -1) || (vmax == -1)) | |
124 | return 0; | |
125 | ||
126 | ret = regulator_set_voltage(vcc_core, vmin, vmax); | |
127 | if (ret) | |
1c5864e2 | 128 | pr_err("Failed to set vcc_core in [%dmV..%dmV]\n", vmin, vmax); |
3dbeef23 RJ |
129 | return ret; |
130 | } | |
131 | ||
9505b98c | 132 | static void pxa_cpufreq_init_voltages(void) |
3dbeef23 RJ |
133 | { |
134 | vcc_core = regulator_get(NULL, "vcc_core"); | |
135 | if (IS_ERR(vcc_core)) { | |
1c5864e2 | 136 | pr_info("Didn't find vcc_core regulator\n"); |
3dbeef23 RJ |
137 | vcc_core = NULL; |
138 | } else { | |
1c5864e2 | 139 | pr_info("Found vcc_core regulator\n"); |
3dbeef23 RJ |
140 | } |
141 | } | |
142 | #else | |
fb2a24a1 | 143 | static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq) |
3dbeef23 RJ |
144 | { |
145 | return 0; | |
146 | } | |
147 | ||
9505b98c | 148 | static void pxa_cpufreq_init_voltages(void) { } |
3dbeef23 RJ |
149 | #endif |
150 | ||
65587f7d | 151 | static void find_freq_tables(struct cpufreq_frequency_table **freq_table, |
03c22990 | 152 | const struct pxa_freqs **pxa_freqs) |
592eb999 RJ |
153 | { |
154 | if (cpu_is_pxa25x()) { | |
65587f7d | 155 | if (!pxa255_turbo_table) { |
592eb999 RJ |
156 | *pxa_freqs = pxa255_run_freqs; |
157 | *freq_table = pxa255_run_freq_table; | |
65587f7d | 158 | } else { |
592eb999 RJ |
159 | *pxa_freqs = pxa255_turbo_freqs; |
160 | *freq_table = pxa255_turbo_freq_table; | |
592eb999 | 161 | } |
7264a2bb | 162 | } else if (cpu_is_pxa27x()) { |
592eb999 RJ |
163 | *pxa_freqs = pxa27x_freqs; |
164 | *freq_table = pxa27x_freq_table; | |
7264a2bb AB |
165 | } else { |
166 | BUG(); | |
592eb999 RJ |
167 | } |
168 | } | |
169 | ||
170 | static void pxa27x_guess_max_freq(void) | |
171 | { | |
172 | if (!pxa27x_maxfreq) { | |
173 | pxa27x_maxfreq = 416000; | |
b49c22a6 JP |
174 | pr_info("PXA CPU 27x max frequency not defined (pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n", |
175 | pxa27x_maxfreq); | |
592eb999 RJ |
176 | } else { |
177 | pxa27x_maxfreq *= 1000; | |
178 | } | |
179 | } | |
180 | ||
592eb999 RJ |
181 | static unsigned int pxa_cpufreq_get(unsigned int cpu) |
182 | { | |
d9278077 RJ |
183 | struct pxa_cpufreq_data *data = cpufreq_get_driver_data(); |
184 | ||
185 | return (unsigned int) clk_get_rate(data->clk_core) / 1000; | |
592eb999 RJ |
186 | } |
187 | ||
9c0ebcf7 | 188 | static int pxa_set_target(struct cpufreq_policy *policy, unsigned int idx) |
9e2697ff RK |
189 | { |
190 | struct cpufreq_frequency_table *pxa_freqs_table; | |
03c22990 | 191 | const struct pxa_freqs *pxa_freq_settings; |
d9278077 RJ |
192 | struct pxa_cpufreq_data *data = cpufreq_get_driver_data(); |
193 | unsigned int new_freq_cpu; | |
3dbeef23 | 194 | int ret = 0; |
9e2697ff RK |
195 | |
196 | /* Get the current policy */ | |
65587f7d | 197 | find_freq_tables(&pxa_freqs_table, &pxa_freq_settings); |
9e2697ff | 198 | |
592eb999 | 199 | new_freq_cpu = pxa_freq_settings[idx].khz; |
9e2697ff RK |
200 | |
201 | if (freq_debug) | |
d9278077 RJ |
202 | pr_debug("Changing CPU frequency from %d Mhz to %d Mhz\n", |
203 | policy->cur / 1000, new_freq_cpu / 1000); | |
9e2697ff | 204 | |
d4019f0a | 205 | if (vcc_core && new_freq_cpu > policy->cur) { |
3dbeef23 | 206 | ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]); |
d4019f0a VK |
207 | if (ret) |
208 | return ret; | |
209 | } | |
9e2697ff | 210 | |
d9278077 | 211 | clk_set_rate(data->clk_core, new_freq_cpu * 1000); |
9e2697ff | 212 | |
3dbeef23 RJ |
213 | /* |
214 | * Even if voltage setting fails, we don't report it, as the frequency | |
215 | * change succeeded. The voltage reduction is not a critical failure, | |
216 | * only power savings will suffer from this. | |
217 | * | |
218 | * Note: if the voltage change fails, and a return value is returned, a | |
219 | * bug is triggered (seems a deadlock). Should anybody find out where, | |
220 | * the "return 0" should become a "return ret". | |
221 | */ | |
d4019f0a | 222 | if (vcc_core && new_freq_cpu < policy->cur) |
3dbeef23 RJ |
223 | ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]); |
224 | ||
9e2697ff RK |
225 | return 0; |
226 | } | |
227 | ||
50e77fcd | 228 | static int pxa_cpufreq_init(struct cpufreq_policy *policy) |
9e2697ff RK |
229 | { |
230 | int i; | |
592eb999 | 231 | unsigned int freq; |
65587f7d | 232 | struct cpufreq_frequency_table *pxa255_freq_table; |
03c22990 | 233 | const struct pxa_freqs *pxa255_freqs; |
592eb999 RJ |
234 | |
235 | /* try to guess pxa27x cpu */ | |
236 | if (cpu_is_pxa27x()) | |
237 | pxa27x_guess_max_freq(); | |
9e2697ff | 238 | |
3dbeef23 RJ |
239 | pxa_cpufreq_init_voltages(); |
240 | ||
9e2697ff | 241 | /* set default policy and cpuinfo */ |
9e2697ff | 242 | policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */ |
9e2697ff | 243 | |
592eb999 RJ |
244 | /* Generate pxa25x the run cpufreq_frequency_table struct */ |
245 | for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) { | |
9e2697ff | 246 | pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz; |
50701588 | 247 | pxa255_run_freq_table[i].driver_data = i; |
9e2697ff | 248 | } |
9e2697ff | 249 | pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END; |
592eb999 RJ |
250 | |
251 | /* Generate pxa25x the turbo cpufreq_frequency_table struct */ | |
252 | for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) { | |
3679389b RJ |
253 | pxa255_turbo_freq_table[i].frequency = |
254 | pxa255_turbo_freqs[i].khz; | |
50701588 | 255 | pxa255_turbo_freq_table[i].driver_data = i; |
9e2697ff RK |
256 | } |
257 | pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END; | |
258 | ||
65587f7d MZ |
259 | pxa255_turbo_table = !!pxa255_turbo_table; |
260 | ||
592eb999 RJ |
261 | /* Generate the pxa27x cpufreq_frequency_table struct */ |
262 | for (i = 0; i < NUM_PXA27x_FREQS; i++) { | |
263 | freq = pxa27x_freqs[i].khz; | |
264 | if (freq > pxa27x_maxfreq) | |
265 | break; | |
266 | pxa27x_freq_table[i].frequency = freq; | |
50701588 | 267 | pxa27x_freq_table[i].driver_data = i; |
592eb999 | 268 | } |
50701588 | 269 | pxa27x_freq_table[i].driver_data = i; |
592eb999 RJ |
270 | pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END; |
271 | ||
272 | /* | |
273 | * Set the policy's minimum and maximum frequencies from the tables | |
274 | * just constructed. This sets cpuinfo.mxx_freq, min and max. | |
275 | */ | |
65587f7d MZ |
276 | if (cpu_is_pxa25x()) { |
277 | find_freq_tables(&pxa255_freq_table, &pxa255_freqs); | |
1c5864e2 | 278 | pr_info("using %s frequency table\n", |
65587f7d | 279 | pxa255_turbo_table ? "turbo" : "run"); |
6a77a1e6 | 280 | |
8ed5a219 | 281 | policy->freq_table = pxa255_freq_table; |
65587f7d | 282 | } |
6a77a1e6 | 283 | else if (cpu_is_pxa27x()) { |
8ed5a219 | 284 | policy->freq_table = pxa27x_freq_table; |
6a77a1e6 | 285 | } |
592eb999 | 286 | |
1c5864e2 | 287 | pr_info("frequency change support initialized\n"); |
9e2697ff RK |
288 | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static struct cpufreq_driver pxa_cpufreq_driver = { | |
ae6b4271 | 293 | .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK, |
bf36e48d | 294 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 295 | .target_index = pxa_set_target, |
9e2697ff | 296 | .init = pxa_cpufreq_init, |
ea833f0b | 297 | .get = pxa_cpufreq_get, |
592eb999 | 298 | .name = "PXA2xx", |
d9278077 | 299 | .driver_data = &pxa_cpufreq_data, |
9e2697ff RK |
300 | }; |
301 | ||
302 | static int __init pxa_cpu_init(void) | |
303 | { | |
304 | int ret = -ENODEV; | |
d9278077 RJ |
305 | |
306 | pxa_cpufreq_data.clk_core = clk_get_sys(NULL, "core"); | |
307 | if (IS_ERR(pxa_cpufreq_data.clk_core)) | |
308 | return PTR_ERR(pxa_cpufreq_data.clk_core); | |
309 | ||
592eb999 | 310 | if (cpu_is_pxa25x() || cpu_is_pxa27x()) |
9e2697ff RK |
311 | ret = cpufreq_register_driver(&pxa_cpufreq_driver); |
312 | return ret; | |
313 | } | |
314 | ||
315 | static void __exit pxa_cpu_exit(void) | |
316 | { | |
592eb999 | 317 | cpufreq_unregister_driver(&pxa_cpufreq_driver); |
9e2697ff RK |
318 | } |
319 | ||
320 | ||
3679389b RJ |
321 | MODULE_AUTHOR("Intrinsyc Software Inc."); |
322 | MODULE_DESCRIPTION("CPU frequency changing driver for the PXA architecture"); | |
9e2697ff RK |
323 | MODULE_LICENSE("GPL"); |
324 | module_init(pxa_cpu_init); | |
325 | module_exit(pxa_cpu_exit); |