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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2002,2003 Intrinsyc Software
4 *
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.
16 */
17
18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
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>
25#include <linux/err.h>
26#include <linux/regulator/consumer.h>
27#include <linux/soc/pxa/cpu.h>
28#include <linux/io.h>
29
30#ifdef DEBUG
31static unsigned int freq_debug;
32module_param(freq_debug, uint, 0);
33MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
34#else
35#define freq_debug 0
36#endif
37
38static struct regulator *vcc_core;
39
40static unsigned int pxa27x_maxfreq;
41module_param(pxa27x_maxfreq, uint, 0);
42MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz"
43 "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)");
44
45struct pxa_cpufreq_data {
46 struct clk *clk_core;
47};
48static struct pxa_cpufreq_data pxa_cpufreq_data;
49
50struct pxa_freqs {
51 unsigned int khz;
52 int vmin;
53 int vmax;
54};
55
56/*
57 * PXA255 definitions
58 */
59static const struct pxa_freqs pxa255_run_freqs[] =
60{
61 /* CPU MEMBUS run turbo PXbus SDRAM */
62 { 99500, -1, -1}, /* 99, 99, 50, 50 */
63 {132700, -1, -1}, /* 133, 133, 66, 66 */
64 {199100, -1, -1}, /* 199, 199, 99, 99 */
65 {265400, -1, -1}, /* 265, 265, 133, 66 */
66 {331800, -1, -1}, /* 331, 331, 166, 83 */
67 {398100, -1, -1}, /* 398, 398, 196, 99 */
68};
69
70/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */
71static const struct pxa_freqs pxa255_turbo_freqs[] =
72{
73 /* CPU run turbo PXbus SDRAM */
74 { 99500, -1, -1}, /* 99, 99, 50, 50 */
75 {199100, -1, -1}, /* 99, 199, 50, 99 */
76 {298500, -1, -1}, /* 99, 287, 50, 99 */
77 {298600, -1, -1}, /* 199, 287, 99, 99 */
78 {398100, -1, -1}, /* 199, 398, 99, 99 */
79};
80
81#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)
82#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs)
83
84static struct cpufreq_frequency_table
85 pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1];
86static struct cpufreq_frequency_table
87 pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];
88
89static unsigned int pxa255_turbo_table;
90module_param(pxa255_turbo_table, uint, 0);
91MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)");
92
93static struct pxa_freqs pxa27x_freqs[] = {
94 {104000, 900000, 1705000 },
95 {156000, 1000000, 1705000 },
96 {208000, 1180000, 1705000 },
97 {312000, 1250000, 1705000 },
98 {416000, 1350000, 1705000 },
99 {520000, 1450000, 1705000 },
100 {624000, 1550000, 1705000 }
101};
102
103#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs)
104static struct cpufreq_frequency_table
105 pxa27x_freq_table[NUM_PXA27x_FREQS+1];
106
107#ifdef CONFIG_REGULATOR
108
109static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
110{
111 int ret = 0;
112 int vmin, vmax;
113
114 if (!cpu_is_pxa27x())
115 return 0;
116
117 vmin = pxa_freq->vmin;
118 vmax = pxa_freq->vmax;
119 if ((vmin == -1) || (vmax == -1))
120 return 0;
121
122 ret = regulator_set_voltage(vcc_core, vmin, vmax);
123 if (ret)
124 pr_err("Failed to set vcc_core in [%dmV..%dmV]\n", vmin, vmax);
125 return ret;
126}
127
128static void pxa_cpufreq_init_voltages(void)
129{
130 vcc_core = regulator_get(NULL, "vcc_core");
131 if (IS_ERR(vcc_core)) {
132 pr_info("Didn't find vcc_core regulator\n");
133 vcc_core = NULL;
134 } else {
135 pr_info("Found vcc_core regulator\n");
136 }
137}
138#else
139static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
140{
141 return 0;
142}
143
144static void pxa_cpufreq_init_voltages(void) { }
145#endif
146
147static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
148 const struct pxa_freqs **pxa_freqs)
149{
150 if (cpu_is_pxa25x()) {
151 if (!pxa255_turbo_table) {
152 *pxa_freqs = pxa255_run_freqs;
153 *freq_table = pxa255_run_freq_table;
154 } else {
155 *pxa_freqs = pxa255_turbo_freqs;
156 *freq_table = pxa255_turbo_freq_table;
157 }
158 } else if (cpu_is_pxa27x()) {
159 *pxa_freqs = pxa27x_freqs;
160 *freq_table = pxa27x_freq_table;
161 } else {
162 BUG();
163 }
164}
165
166static void pxa27x_guess_max_freq(void)
167{
168 if (!pxa27x_maxfreq) {
169 pxa27x_maxfreq = 416000;
170 pr_info("PXA CPU 27x max frequency not defined (pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n",
171 pxa27x_maxfreq);
172 } else {
173 pxa27x_maxfreq *= 1000;
174 }
175}
176
177static unsigned int pxa_cpufreq_get(unsigned int cpu)
178{
179 struct pxa_cpufreq_data *data = cpufreq_get_driver_data();
180
181 return (unsigned int) clk_get_rate(data->clk_core) / 1000;
182}
183
184static int pxa_set_target(struct cpufreq_policy *policy, unsigned int idx)
185{
186 struct cpufreq_frequency_table *pxa_freqs_table;
187 const struct pxa_freqs *pxa_freq_settings;
188 struct pxa_cpufreq_data *data = cpufreq_get_driver_data();
189 unsigned int new_freq_cpu;
190 int ret = 0;
191
192 /* Get the current policy */
193 find_freq_tables(&pxa_freqs_table, &pxa_freq_settings);
194
195 new_freq_cpu = pxa_freq_settings[idx].khz;
196
197 if (freq_debug)
198 pr_debug("Changing CPU frequency from %d Mhz to %d Mhz\n",
199 policy->cur / 1000, new_freq_cpu / 1000);
200
201 if (vcc_core && new_freq_cpu > policy->cur) {
202 ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
203 if (ret)
204 return ret;
205 }
206
207 clk_set_rate(data->clk_core, new_freq_cpu * 1000);
208
209 /*
210 * Even if voltage setting fails, we don't report it, as the frequency
211 * change succeeded. The voltage reduction is not a critical failure,
212 * only power savings will suffer from this.
213 *
214 * Note: if the voltage change fails, and a return value is returned, a
215 * bug is triggered (seems a deadlock). Should anybody find out where,
216 * the "return 0" should become a "return ret".
217 */
218 if (vcc_core && new_freq_cpu < policy->cur)
219 ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
220
221 return 0;
222}
223
224static int pxa_cpufreq_init(struct cpufreq_policy *policy)
225{
226 int i;
227 unsigned int freq;
228 struct cpufreq_frequency_table *pxa255_freq_table;
229 const struct pxa_freqs *pxa255_freqs;
230
231 /* try to guess pxa27x cpu */
232 if (cpu_is_pxa27x())
233 pxa27x_guess_max_freq();
234
235 pxa_cpufreq_init_voltages();
236
237 /* set default policy and cpuinfo */
238 policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
239
240 /* Generate pxa25x the run cpufreq_frequency_table struct */
241 for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) {
242 pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz;
243 pxa255_run_freq_table[i].driver_data = i;
244 }
245 pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END;
246
247 /* Generate pxa25x the turbo cpufreq_frequency_table struct */
248 for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) {
249 pxa255_turbo_freq_table[i].frequency =
250 pxa255_turbo_freqs[i].khz;
251 pxa255_turbo_freq_table[i].driver_data = i;
252 }
253 pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END;
254
255 pxa255_turbo_table = !!pxa255_turbo_table;
256
257 /* Generate the pxa27x cpufreq_frequency_table struct */
258 for (i = 0; i < NUM_PXA27x_FREQS; i++) {
259 freq = pxa27x_freqs[i].khz;
260 if (freq > pxa27x_maxfreq)
261 break;
262 pxa27x_freq_table[i].frequency = freq;
263 pxa27x_freq_table[i].driver_data = i;
264 }
265 pxa27x_freq_table[i].driver_data = i;
266 pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END;
267
268 /*
269 * Set the policy's minimum and maximum frequencies from the tables
270 * just constructed. This sets cpuinfo.mxx_freq, min and max.
271 */
272 if (cpu_is_pxa25x()) {
273 find_freq_tables(&pxa255_freq_table, &pxa255_freqs);
274 pr_info("using %s frequency table\n",
275 pxa255_turbo_table ? "turbo" : "run");
276
277 policy->freq_table = pxa255_freq_table;
278 }
279 else if (cpu_is_pxa27x()) {
280 policy->freq_table = pxa27x_freq_table;
281 }
282
283 pr_info("frequency change support initialized\n");
284
285 return 0;
286}
287
288static struct cpufreq_driver pxa_cpufreq_driver = {
289 .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
290 .verify = cpufreq_generic_frequency_table_verify,
291 .target_index = pxa_set_target,
292 .init = pxa_cpufreq_init,
293 .get = pxa_cpufreq_get,
294 .name = "PXA2xx",
295 .driver_data = &pxa_cpufreq_data,
296};
297
298static int __init pxa_cpu_init(void)
299{
300 int ret = -ENODEV;
301
302 pxa_cpufreq_data.clk_core = clk_get_sys(NULL, "core");
303 if (IS_ERR(pxa_cpufreq_data.clk_core))
304 return PTR_ERR(pxa_cpufreq_data.clk_core);
305
306 if (cpu_is_pxa25x() || cpu_is_pxa27x())
307 ret = cpufreq_register_driver(&pxa_cpufreq_driver);
308 return ret;
309}
310
311static void __exit pxa_cpu_exit(void)
312{
313 cpufreq_unregister_driver(&pxa_cpufreq_driver);
314}
315
316
317MODULE_AUTHOR("Intrinsyc Software Inc.");
318MODULE_DESCRIPTION("CPU frequency changing driver for the PXA architecture");
319MODULE_LICENSE("GPL");
320module_init(pxa_cpu_init);
321module_exit(pxa_cpu_exit);
1/*
2 * Copyright (C) 2002,2003 Intrinsyc Software
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * History:
19 * 31-Jul-2002 : Initial version [FB]
20 * 29-Jan-2003 : added PXA255 support [FB]
21 * 20-Apr-2003 : ported to v2.5 (Dustin McIntire, Sensoria Corp.)
22 *
23 * Note:
24 * This driver may change the memory bus clock rate, but will not do any
25 * platform specific access timing changes... for example if you have flash
26 * memory connected to CS0, you will need to register a platform specific
27 * notifier which will adjust the memory access strobes to maintain a
28 * minimum strobe width.
29 *
30 */
31
32#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/sched.h>
37#include <linux/init.h>
38#include <linux/cpufreq.h>
39#include <linux/err.h>
40#include <linux/regulator/consumer.h>
41#include <linux/io.h>
42
43#include <mach/pxa2xx-regs.h>
44#include <mach/smemc.h>
45
46#ifdef DEBUG
47static unsigned int freq_debug;
48module_param(freq_debug, uint, 0);
49MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
50#else
51#define freq_debug 0
52#endif
53
54static struct regulator *vcc_core;
55
56static unsigned int pxa27x_maxfreq;
57module_param(pxa27x_maxfreq, uint, 0);
58MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz"
59 "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)");
60
61struct pxa_cpufreq_data {
62 struct clk *clk_core;
63};
64static struct pxa_cpufreq_data pxa_cpufreq_data;
65
66struct pxa_freqs {
67 unsigned int khz;
68 int vmin;
69 int vmax;
70};
71
72/*
73 * PXA255 definitions
74 */
75static const struct pxa_freqs pxa255_run_freqs[] =
76{
77 /* CPU MEMBUS run turbo PXbus SDRAM */
78 { 99500, -1, -1}, /* 99, 99, 50, 50 */
79 {132700, -1, -1}, /* 133, 133, 66, 66 */
80 {199100, -1, -1}, /* 199, 199, 99, 99 */
81 {265400, -1, -1}, /* 265, 265, 133, 66 */
82 {331800, -1, -1}, /* 331, 331, 166, 83 */
83 {398100, -1, -1}, /* 398, 398, 196, 99 */
84};
85
86/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */
87static const struct pxa_freqs pxa255_turbo_freqs[] =
88{
89 /* CPU run turbo PXbus SDRAM */
90 { 99500, -1, -1}, /* 99, 99, 50, 50 */
91 {199100, -1, -1}, /* 99, 199, 50, 99 */
92 {298500, -1, -1}, /* 99, 287, 50, 99 */
93 {298600, -1, -1}, /* 199, 287, 99, 99 */
94 {398100, -1, -1}, /* 199, 398, 99, 99 */
95};
96
97#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)
98#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs)
99
100static struct cpufreq_frequency_table
101 pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1];
102static struct cpufreq_frequency_table
103 pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];
104
105static unsigned int pxa255_turbo_table;
106module_param(pxa255_turbo_table, uint, 0);
107MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)");
108
109static struct pxa_freqs pxa27x_freqs[] = {
110 {104000, 900000, 1705000 },
111 {156000, 1000000, 1705000 },
112 {208000, 1180000, 1705000 },
113 {312000, 1250000, 1705000 },
114 {416000, 1350000, 1705000 },
115 {520000, 1450000, 1705000 },
116 {624000, 1550000, 1705000 }
117};
118
119#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs)
120static struct cpufreq_frequency_table
121 pxa27x_freq_table[NUM_PXA27x_FREQS+1];
122
123extern unsigned get_clk_frequency_khz(int info);
124
125#ifdef CONFIG_REGULATOR
126
127static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
128{
129 int ret = 0;
130 int vmin, vmax;
131
132 if (!cpu_is_pxa27x())
133 return 0;
134
135 vmin = pxa_freq->vmin;
136 vmax = pxa_freq->vmax;
137 if ((vmin == -1) || (vmax == -1))
138 return 0;
139
140 ret = regulator_set_voltage(vcc_core, vmin, vmax);
141 if (ret)
142 pr_err("Failed to set vcc_core in [%dmV..%dmV]\n", vmin, vmax);
143 return ret;
144}
145
146static void __init pxa_cpufreq_init_voltages(void)
147{
148 vcc_core = regulator_get(NULL, "vcc_core");
149 if (IS_ERR(vcc_core)) {
150 pr_info("Didn't find vcc_core regulator\n");
151 vcc_core = NULL;
152 } else {
153 pr_info("Found vcc_core regulator\n");
154 }
155}
156#else
157static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
158{
159 return 0;
160}
161
162static void __init pxa_cpufreq_init_voltages(void) { }
163#endif
164
165static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
166 const struct pxa_freqs **pxa_freqs)
167{
168 if (cpu_is_pxa25x()) {
169 if (!pxa255_turbo_table) {
170 *pxa_freqs = pxa255_run_freqs;
171 *freq_table = pxa255_run_freq_table;
172 } else {
173 *pxa_freqs = pxa255_turbo_freqs;
174 *freq_table = pxa255_turbo_freq_table;
175 }
176 } else if (cpu_is_pxa27x()) {
177 *pxa_freqs = pxa27x_freqs;
178 *freq_table = pxa27x_freq_table;
179 } else {
180 BUG();
181 }
182}
183
184static void pxa27x_guess_max_freq(void)
185{
186 if (!pxa27x_maxfreq) {
187 pxa27x_maxfreq = 416000;
188 pr_info("PXA CPU 27x max frequency not defined (pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n",
189 pxa27x_maxfreq);
190 } else {
191 pxa27x_maxfreq *= 1000;
192 }
193}
194
195static unsigned int pxa_cpufreq_get(unsigned int cpu)
196{
197 struct pxa_cpufreq_data *data = cpufreq_get_driver_data();
198
199 return (unsigned int) clk_get_rate(data->clk_core) / 1000;
200}
201
202static int pxa_set_target(struct cpufreq_policy *policy, unsigned int idx)
203{
204 struct cpufreq_frequency_table *pxa_freqs_table;
205 const struct pxa_freqs *pxa_freq_settings;
206 struct pxa_cpufreq_data *data = cpufreq_get_driver_data();
207 unsigned int new_freq_cpu;
208 int ret = 0;
209
210 /* Get the current policy */
211 find_freq_tables(&pxa_freqs_table, &pxa_freq_settings);
212
213 new_freq_cpu = pxa_freq_settings[idx].khz;
214
215 if (freq_debug)
216 pr_debug("Changing CPU frequency from %d Mhz to %d Mhz\n",
217 policy->cur / 1000, new_freq_cpu / 1000);
218
219 if (vcc_core && new_freq_cpu > policy->cur) {
220 ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
221 if (ret)
222 return ret;
223 }
224
225 clk_set_rate(data->clk_core, new_freq_cpu * 1000);
226
227 /*
228 * Even if voltage setting fails, we don't report it, as the frequency
229 * change succeeded. The voltage reduction is not a critical failure,
230 * only power savings will suffer from this.
231 *
232 * Note: if the voltage change fails, and a return value is returned, a
233 * bug is triggered (seems a deadlock). Should anybody find out where,
234 * the "return 0" should become a "return ret".
235 */
236 if (vcc_core && new_freq_cpu < policy->cur)
237 ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
238
239 return 0;
240}
241
242static int pxa_cpufreq_init(struct cpufreq_policy *policy)
243{
244 int i;
245 unsigned int freq;
246 struct cpufreq_frequency_table *pxa255_freq_table;
247 const struct pxa_freqs *pxa255_freqs;
248
249 /* try to guess pxa27x cpu */
250 if (cpu_is_pxa27x())
251 pxa27x_guess_max_freq();
252
253 pxa_cpufreq_init_voltages();
254
255 /* set default policy and cpuinfo */
256 policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
257
258 /* Generate pxa25x the run cpufreq_frequency_table struct */
259 for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) {
260 pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz;
261 pxa255_run_freq_table[i].driver_data = i;
262 }
263 pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END;
264
265 /* Generate pxa25x the turbo cpufreq_frequency_table struct */
266 for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) {
267 pxa255_turbo_freq_table[i].frequency =
268 pxa255_turbo_freqs[i].khz;
269 pxa255_turbo_freq_table[i].driver_data = i;
270 }
271 pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END;
272
273 pxa255_turbo_table = !!pxa255_turbo_table;
274
275 /* Generate the pxa27x cpufreq_frequency_table struct */
276 for (i = 0; i < NUM_PXA27x_FREQS; i++) {
277 freq = pxa27x_freqs[i].khz;
278 if (freq > pxa27x_maxfreq)
279 break;
280 pxa27x_freq_table[i].frequency = freq;
281 pxa27x_freq_table[i].driver_data = i;
282 }
283 pxa27x_freq_table[i].driver_data = i;
284 pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END;
285
286 /*
287 * Set the policy's minimum and maximum frequencies from the tables
288 * just constructed. This sets cpuinfo.mxx_freq, min and max.
289 */
290 if (cpu_is_pxa25x()) {
291 find_freq_tables(&pxa255_freq_table, &pxa255_freqs);
292 pr_info("using %s frequency table\n",
293 pxa255_turbo_table ? "turbo" : "run");
294
295 policy->freq_table = pxa255_freq_table;
296 }
297 else if (cpu_is_pxa27x()) {
298 policy->freq_table = pxa27x_freq_table;
299 }
300
301 pr_info("frequency change support initialized\n");
302
303 return 0;
304}
305
306static struct cpufreq_driver pxa_cpufreq_driver = {
307 .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
308 .verify = cpufreq_generic_frequency_table_verify,
309 .target_index = pxa_set_target,
310 .init = pxa_cpufreq_init,
311 .get = pxa_cpufreq_get,
312 .name = "PXA2xx",
313 .driver_data = &pxa_cpufreq_data,
314};
315
316static int __init pxa_cpu_init(void)
317{
318 int ret = -ENODEV;
319
320 pxa_cpufreq_data.clk_core = clk_get_sys(NULL, "core");
321 if (IS_ERR(pxa_cpufreq_data.clk_core))
322 return PTR_ERR(pxa_cpufreq_data.clk_core);
323
324 if (cpu_is_pxa25x() || cpu_is_pxa27x())
325 ret = cpufreq_register_driver(&pxa_cpufreq_driver);
326 return ret;
327}
328
329static void __exit pxa_cpu_exit(void)
330{
331 cpufreq_unregister_driver(&pxa_cpufreq_driver);
332}
333
334
335MODULE_AUTHOR("Intrinsyc Software Inc.");
336MODULE_DESCRIPTION("CPU frequency changing driver for the PXA architecture");
337MODULE_LICENSE("GPL");
338module_init(pxa_cpu_init);
339module_exit(pxa_cpu_exit);