blob: 9e5bc8e388a0239ee5061fdd427c016e8abf68b5 [file] [log] [blame]
Russell King9e2697f2007-12-14 13:30:14 +00001/*
Russell King9e2697f2007-12-14 13:30:14 +00002 * 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#include <linux/kernel.h>
33#include <linux/module.h>
34#include <linux/sched.h>
35#include <linux/init.h>
36#include <linux/cpufreq.h>
Robert Jarzmik3dbeef22009-05-17 23:03:55 +020037#include <linux/err.h>
38#include <linux/regulator/consumer.h>
Marek Vasutad68bb92010-11-03 16:29:35 +010039#include <linux/io.h>
Russell King9e2697f2007-12-14 13:30:14 +000040
Russell Kinga09e64f2008-08-05 16:14:15 +010041#include <mach/pxa2xx-regs.h>
Marek Vasutad68bb92010-11-03 16:29:35 +010042#include <mach/smemc.h>
Russell King9e2697f2007-12-14 13:30:14 +000043
44#ifdef DEBUG
45static unsigned int freq_debug;
Randy Dunlapc710e392008-02-27 12:11:16 -080046module_param(freq_debug, uint, 0);
Russell King9e2697f2007-12-14 13:30:14 +000047MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
48#else
49#define freq_debug 0
50#endif
51
Robert Jarzmik3dbeef22009-05-17 23:03:55 +020052static struct regulator *vcc_core;
53
Robert Jarzmik592eb992008-05-07 20:39:06 +010054static unsigned int pxa27x_maxfreq;
55module_param(pxa27x_maxfreq, uint, 0);
56MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz"
57 "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)");
58
Russell King9e2697f2007-12-14 13:30:14 +000059typedef struct {
60 unsigned int khz;
61 unsigned int membus;
62 unsigned int cccr;
63 unsigned int div2;
Robert Jarzmik592eb992008-05-07 20:39:06 +010064 unsigned int cclkcfg;
Robert Jarzmik3dbeef22009-05-17 23:03:55 +020065 int vmin;
66 int vmax;
Russell King9e2697f2007-12-14 13:30:14 +000067} pxa_freqs_t;
68
69/* Define the refresh period in mSec for the SDRAM and the number of rows */
Robert Jarzmik36793892008-05-07 20:36:34 +010070#define SDRAM_TREF 64 /* standard 64ms SDRAM */
Philipp Zabela10c2872008-06-29 16:53:34 +020071static unsigned int sdram_rows;
Russell King9e2697f2007-12-14 13:30:14 +000072
Robert Jarzmik36793892008-05-07 20:36:34 +010073#define CCLKCFG_TURBO 0x1
74#define CCLKCFG_FCS 0x2
Robert Jarzmik592eb992008-05-07 20:39:06 +010075#define CCLKCFG_HALFTURBO 0x4
76#define CCLKCFG_FASTBUS 0x8
Robert Jarzmik36793892008-05-07 20:36:34 +010077#define MDREFR_DB2_MASK (MDREFR_K2DB2 | MDREFR_K1DB2)
78#define MDREFR_DRI_MASK 0xFFF
Russell King9e2697f2007-12-14 13:30:14 +000079
Philipp Zabela10c2872008-06-29 16:53:34 +020080#define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3)
81#define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3)
82
Robert Jarzmik592eb992008-05-07 20:39:06 +010083/*
84 * PXA255 definitions
85 */
Russell King9e2697f2007-12-14 13:30:14 +000086/* Use the run mode frequencies for the CPUFREQ_POLICY_PERFORMANCE policy */
Robert Jarzmik592eb992008-05-07 20:39:06 +010087#define CCLKCFG CCLKCFG_TURBO | CCLKCFG_FCS
88
Russell King9e2697f2007-12-14 13:30:14 +000089static pxa_freqs_t pxa255_run_freqs[] =
90{
Robert Jarzmik3dbeef22009-05-17 23:03:55 +020091 /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */
92 { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */
93 {132700, 132700, 0x123, 1, CCLKCFG, -1, -1}, /* 133, 133, 66, 66 */
94 {199100, 99500, 0x141, 0, CCLKCFG, -1, -1}, /* 199, 199, 99, 99 */
95 {265400, 132700, 0x143, 1, CCLKCFG, -1, -1}, /* 265, 265, 133, 66 */
96 {331800, 165900, 0x145, 1, CCLKCFG, -1, -1}, /* 331, 331, 166, 83 */
97 {398100, 99500, 0x161, 0, CCLKCFG, -1, -1}, /* 398, 398, 196, 99 */
Russell King9e2697f2007-12-14 13:30:14 +000098};
Russell King9e2697f2007-12-14 13:30:14 +000099
100/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */
101static pxa_freqs_t pxa255_turbo_freqs[] =
102{
Robert Jarzmik592eb992008-05-07 20:39:06 +0100103 /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200104 { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */
105 {199100, 99500, 0x221, 0, CCLKCFG, -1, -1}, /* 99, 199, 50, 99 */
106 {298500, 99500, 0x321, 0, CCLKCFG, -1, -1}, /* 99, 287, 50, 99 */
107 {298600, 99500, 0x1c1, 0, CCLKCFG, -1, -1}, /* 199, 287, 99, 99 */
108 {398100, 99500, 0x241, 0, CCLKCFG, -1, -1}, /* 199, 398, 99, 99 */
Russell King9e2697f2007-12-14 13:30:14 +0000109};
Robert Jarzmik592eb992008-05-07 20:39:06 +0100110
111#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)
112#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs)
Russell King9e2697f2007-12-14 13:30:14 +0000113
Robert Jarzmik36793892008-05-07 20:36:34 +0100114static struct cpufreq_frequency_table
Robert Jarzmik592eb992008-05-07 20:39:06 +0100115 pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1];
116static struct cpufreq_frequency_table
117 pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];
118
Marc Zyngier65587f72008-11-04 13:33:25 +0100119static unsigned int pxa255_turbo_table;
120module_param(pxa255_turbo_table, uint, 0);
121MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)");
122
Robert Jarzmik592eb992008-05-07 20:39:06 +0100123/*
124 * PXA270 definitions
125 *
126 * For the PXA27x:
127 * Control variables are A, L, 2N for CCCR; B, HT, T for CLKCFG.
128 *
129 * A = 0 => memory controller clock from table 3-7,
130 * A = 1 => memory controller clock = system bus clock
131 * Run mode frequency = 13 MHz * L
132 * Turbo mode frequency = 13 MHz * L * N
133 * System bus frequency = 13 MHz * L / (B + 1)
134 *
135 * In CCCR:
136 * A = 1
137 * L = 16 oscillator to run mode ratio
138 * 2N = 6 2 * (turbo mode to run mode ratio)
139 *
140 * In CCLKCFG:
141 * B = 1 Fast bus mode
142 * HT = 0 Half-Turbo mode
143 * T = 1 Turbo mode
144 *
145 * For now, just support some of the combinations in table 3-7 of
146 * PXA27x Processor Family Developer's Manual to simplify frequency
147 * change sequences.
148 */
149#define PXA27x_CCCR(A, L, N2) (A << 25 | N2 << 7 | L)
150#define CCLKCFG2(B, HT, T) \
151 (CCLKCFG_FCS | \
152 ((B) ? CCLKCFG_FASTBUS : 0) | \
153 ((HT) ? CCLKCFG_HALFTURBO : 0) | \
154 ((T) ? CCLKCFG_TURBO : 0))
155
156static pxa_freqs_t pxa27x_freqs[] = {
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200157 {104000, 104000, PXA27x_CCCR(1, 8, 2), 0, CCLKCFG2(1, 0, 1), 900000, 1705000 },
Dennis O'Brien43672162009-10-10 15:08:52 +0800158 {156000, 104000, PXA27x_CCCR(1, 8, 3), 0, CCLKCFG2(1, 0, 1), 1000000, 1705000 },
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200159 {208000, 208000, PXA27x_CCCR(0, 16, 2), 1, CCLKCFG2(0, 0, 1), 1180000, 1705000 },
160 {312000, 208000, PXA27x_CCCR(1, 16, 3), 1, CCLKCFG2(1, 0, 1), 1250000, 1705000 },
161 {416000, 208000, PXA27x_CCCR(1, 16, 4), 1, CCLKCFG2(1, 0, 1), 1350000, 1705000 },
162 {520000, 208000, PXA27x_CCCR(1, 16, 5), 1, CCLKCFG2(1, 0, 1), 1450000, 1705000 },
163 {624000, 208000, PXA27x_CCCR(1, 16, 6), 1, CCLKCFG2(1, 0, 1), 1550000, 1705000 }
Robert Jarzmik592eb992008-05-07 20:39:06 +0100164};
165
166#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs)
167static struct cpufreq_frequency_table
168 pxa27x_freq_table[NUM_PXA27x_FREQS+1];
Russell King9e2697f2007-12-14 13:30:14 +0000169
170extern unsigned get_clk_frequency_khz(int info);
171
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200172#ifdef CONFIG_REGULATOR
173
174static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq)
175{
176 int ret = 0;
177 int vmin, vmax;
178
179 if (!cpu_is_pxa27x())
180 return 0;
181
182 vmin = pxa_freq->vmin;
183 vmax = pxa_freq->vmax;
184 if ((vmin == -1) || (vmax == -1))
185 return 0;
186
187 ret = regulator_set_voltage(vcc_core, vmin, vmax);
188 if (ret)
189 pr_err("cpufreq: Failed to set vcc_core in [%dmV..%dmV]\n",
190 vmin, vmax);
191 return ret;
192}
193
194static __init void pxa_cpufreq_init_voltages(void)
195{
196 vcc_core = regulator_get(NULL, "vcc_core");
197 if (IS_ERR(vcc_core)) {
198 pr_info("cpufreq: Didn't find vcc_core regulator\n");
199 vcc_core = NULL;
200 } else {
201 pr_info("cpufreq: Found vcc_core regulator\n");
202 }
203}
204#else
205static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq)
206{
207 return 0;
208}
209
210static __init void pxa_cpufreq_init_voltages(void) { }
211#endif
212
Marc Zyngier65587f72008-11-04 13:33:25 +0100213static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
Robert Jarzmik592eb992008-05-07 20:39:06 +0100214 pxa_freqs_t **pxa_freqs)
215{
216 if (cpu_is_pxa25x()) {
Marc Zyngier65587f72008-11-04 13:33:25 +0100217 if (!pxa255_turbo_table) {
Robert Jarzmik592eb992008-05-07 20:39:06 +0100218 *pxa_freqs = pxa255_run_freqs;
219 *freq_table = pxa255_run_freq_table;
Marc Zyngier65587f72008-11-04 13:33:25 +0100220 } else {
Robert Jarzmik592eb992008-05-07 20:39:06 +0100221 *pxa_freqs = pxa255_turbo_freqs;
222 *freq_table = pxa255_turbo_freq_table;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100223 }
Arnd Bergmann7264a2b2013-04-25 19:28:57 +0200224 } else if (cpu_is_pxa27x()) {
Robert Jarzmik592eb992008-05-07 20:39:06 +0100225 *pxa_freqs = pxa27x_freqs;
226 *freq_table = pxa27x_freq_table;
Arnd Bergmann7264a2b2013-04-25 19:28:57 +0200227 } else {
228 BUG();
Robert Jarzmik592eb992008-05-07 20:39:06 +0100229 }
230}
231
232static void pxa27x_guess_max_freq(void)
233{
234 if (!pxa27x_maxfreq) {
235 pxa27x_maxfreq = 416000;
236 printk(KERN_INFO "PXA CPU 27x max frequency not defined "
237 "(pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n",
238 pxa27x_maxfreq);
239 } else {
240 pxa27x_maxfreq *= 1000;
241 }
242}
243
Philipp Zabela10c2872008-06-29 16:53:34 +0200244static void init_sdram_rows(void)
245{
Marek Vasutad68bb92010-11-03 16:29:35 +0100246 uint32_t mdcnfg = __raw_readl(MDCNFG);
Philipp Zabela10c2872008-06-29 16:53:34 +0200247 unsigned int drac2 = 0, drac0 = 0;
248
249 if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3))
250 drac2 = MDCNFG_DRAC2(mdcnfg);
251
252 if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1))
253 drac0 = MDCNFG_DRAC0(mdcnfg);
254
255 sdram_rows = 1 << (11 + max(drac0, drac2));
256}
257
Robert Jarzmik592eb992008-05-07 20:39:06 +0100258static u32 mdrefr_dri(unsigned int freq)
259{
Marek Vasut3d3d0fb2010-06-24 15:57:12 +0200260 u32 interval = freq * SDRAM_TREF / sdram_rows;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100261
Marek Vasut3d3d0fb2010-06-24 15:57:12 +0200262 return (interval - (cpu_is_pxa27x() ? 31 : 0)) / 32;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100263}
264
Russell King9e2697f2007-12-14 13:30:14 +0000265/* find a valid frequency point */
266static int pxa_verify_policy(struct cpufreq_policy *policy)
267{
268 struct cpufreq_frequency_table *pxa_freqs_table;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100269 pxa_freqs_t *pxa_freqs;
Russell King9e2697f2007-12-14 13:30:14 +0000270 int ret;
271
Marc Zyngier65587f72008-11-04 13:33:25 +0100272 find_freq_tables(&pxa_freqs_table, &pxa_freqs);
Russell King9e2697f2007-12-14 13:30:14 +0000273 ret = cpufreq_frequency_table_verify(policy, pxa_freqs_table);
274
275 if (freq_debug)
276 pr_debug("Verified CPU policy: %dKhz min to %dKhz max\n",
Robert Jarzmik36793892008-05-07 20:36:34 +0100277 policy->min, policy->max);
Russell King9e2697f2007-12-14 13:30:14 +0000278
279 return ret;
280}
281
Robert Jarzmik592eb992008-05-07 20:39:06 +0100282static unsigned int pxa_cpufreq_get(unsigned int cpu)
283{
284 return get_clk_frequency_khz(0);
285}
286
Russell King9e2697f2007-12-14 13:30:14 +0000287static int pxa_set_target(struct cpufreq_policy *policy,
Robert Jarzmik36793892008-05-07 20:36:34 +0100288 unsigned int target_freq,
289 unsigned int relation)
Russell King9e2697f2007-12-14 13:30:14 +0000290{
291 struct cpufreq_frequency_table *pxa_freqs_table;
292 pxa_freqs_t *pxa_freq_settings;
293 struct cpufreq_freqs freqs;
Holger Schurigea833f02008-02-11 16:53:15 +0100294 unsigned int idx;
Russell King9e2697f2007-12-14 13:30:14 +0000295 unsigned long flags;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100296 unsigned int new_freq_cpu, new_freq_mem;
297 unsigned int unused, preset_mdrefr, postset_mdrefr, cclkcfg;
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200298 int ret = 0;
Russell King9e2697f2007-12-14 13:30:14 +0000299
300 /* Get the current policy */
Marc Zyngier65587f72008-11-04 13:33:25 +0100301 find_freq_tables(&pxa_freqs_table, &pxa_freq_settings);
Russell King9e2697f2007-12-14 13:30:14 +0000302
303 /* Lookup the next frequency */
304 if (cpufreq_frequency_table_target(policy, pxa_freqs_table,
Robert Jarzmik36793892008-05-07 20:36:34 +0100305 target_freq, relation, &idx)) {
Russell King9e2697f2007-12-14 13:30:14 +0000306 return -EINVAL;
307 }
308
Robert Jarzmik592eb992008-05-07 20:39:06 +0100309 new_freq_cpu = pxa_freq_settings[idx].khz;
310 new_freq_mem = pxa_freq_settings[idx].membus;
Russell King9e2697f2007-12-14 13:30:14 +0000311 freqs.old = policy->cur;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100312 freqs.new = new_freq_cpu;
Russell King9e2697f2007-12-14 13:30:14 +0000313
314 if (freq_debug)
Joe Perchesd4202802010-09-11 22:10:49 -0700315 pr_debug("Changing CPU frequency to %d Mhz, (SDRAM %d Mhz)\n",
Robert Jarzmik36793892008-05-07 20:36:34 +0100316 freqs.new / 1000, (pxa_freq_settings[idx].div2) ?
Robert Jarzmik592eb992008-05-07 20:39:06 +0100317 (new_freq_mem / 2000) : (new_freq_mem / 1000));
Russell King9e2697f2007-12-14 13:30:14 +0000318
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200319 if (vcc_core && freqs.new > freqs.old)
320 ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
321 if (ret)
322 return ret;
Russell King9e2697f2007-12-14 13:30:14 +0000323 /*
324 * Tell everyone what we're about to do...
325 * you should add a notify client with any platform specific
326 * Vcc changing capability
327 */
Viresh Kumarb43a7ff2013-03-24 11:56:43 +0530328 cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
Russell King9e2697f2007-12-14 13:30:14 +0000329
330 /* Calculate the next MDREFR. If we're slowing down the SDRAM clock
Robert Jarzmik36793892008-05-07 20:36:34 +0100331 * we need to preset the smaller DRI before the change. If we're
332 * speeding up we need to set the larger DRI value after the change.
Russell King9e2697f2007-12-14 13:30:14 +0000333 */
Marek Vasutad68bb92010-11-03 16:29:35 +0100334 preset_mdrefr = postset_mdrefr = __raw_readl(MDREFR);
335 if ((preset_mdrefr & MDREFR_DRI_MASK) > mdrefr_dri(new_freq_mem)) {
Robert Jarzmik592eb992008-05-07 20:39:06 +0100336 preset_mdrefr = (preset_mdrefr & ~MDREFR_DRI_MASK);
337 preset_mdrefr |= mdrefr_dri(new_freq_mem);
Russell King9e2697f2007-12-14 13:30:14 +0000338 }
Robert Jarzmik592eb992008-05-07 20:39:06 +0100339 postset_mdrefr =
340 (postset_mdrefr & ~MDREFR_DRI_MASK) | mdrefr_dri(new_freq_mem);
Russell King9e2697f2007-12-14 13:30:14 +0000341
342 /* If we're dividing the memory clock by two for the SDRAM clock, this
343 * must be set prior to the change. Clearing the divide must be done
344 * after the change.
345 */
346 if (pxa_freq_settings[idx].div2) {
347 preset_mdrefr |= MDREFR_DB2_MASK;
348 postset_mdrefr |= MDREFR_DB2_MASK;
349 } else {
350 postset_mdrefr &= ~MDREFR_DB2_MASK;
351 }
352
353 local_irq_save(flags);
354
Robert Jarzmik592eb992008-05-07 20:39:06 +0100355 /* Set new the CCCR and prepare CCLKCFG */
Russell King9e2697f2007-12-14 13:30:14 +0000356 CCCR = pxa_freq_settings[idx].cccr;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100357 cclkcfg = pxa_freq_settings[idx].cclkcfg;
Russell King9e2697f2007-12-14 13:30:14 +0000358
359 asm volatile(" \n\
360 ldr r4, [%1] /* load MDREFR */ \n\
361 b 2f \n\
Robert Jarzmik36793892008-05-07 20:36:34 +0100362 .align 5 \n\
Russell King9e2697f2007-12-14 13:30:14 +00003631: \n\
Robert Jarzmik592eb992008-05-07 20:39:06 +0100364 str %3, [%1] /* preset the MDREFR */ \n\
Russell King9e2697f2007-12-14 13:30:14 +0000365 mcr p14, 0, %2, c6, c0, 0 /* set CCLKCFG[FCS] */ \n\
Robert Jarzmik592eb992008-05-07 20:39:06 +0100366 str %4, [%1] /* postset the MDREFR */ \n\
Russell King9e2697f2007-12-14 13:30:14 +0000367 \n\
368 b 3f \n\
3692: b 1b \n\
3703: nop \n\
371 "
Robert Jarzmik36793892008-05-07 20:36:34 +0100372 : "=&r" (unused)
Marek Vasutad68bb92010-11-03 16:29:35 +0100373 : "r" (MDREFR), "r" (cclkcfg),
Robert Jarzmik592eb992008-05-07 20:39:06 +0100374 "r" (preset_mdrefr), "r" (postset_mdrefr)
Robert Jarzmik36793892008-05-07 20:36:34 +0100375 : "r4", "r5");
Russell King9e2697f2007-12-14 13:30:14 +0000376 local_irq_restore(flags);
377
378 /*
379 * Tell everyone what we've just done...
380 * you should add a notify client with any platform specific
381 * SDRAM refresh timer adjustments
382 */
Viresh Kumarb43a7ff2013-03-24 11:56:43 +0530383 cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
Russell King9e2697f2007-12-14 13:30:14 +0000384
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200385 /*
386 * Even if voltage setting fails, we don't report it, as the frequency
387 * change succeeded. The voltage reduction is not a critical failure,
388 * only power savings will suffer from this.
389 *
390 * Note: if the voltage change fails, and a return value is returned, a
391 * bug is triggered (seems a deadlock). Should anybody find out where,
392 * the "return 0" should become a "return ret".
393 */
394 if (vcc_core && freqs.new < freqs.old)
395 ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
396
Russell King9e2697f2007-12-14 13:30:14 +0000397 return 0;
398}
399
Eric Miao50e77fc2010-08-18 11:51:13 +0800400static int pxa_cpufreq_init(struct cpufreq_policy *policy)
Russell King9e2697f2007-12-14 13:30:14 +0000401{
402 int i;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100403 unsigned int freq;
Marc Zyngier65587f72008-11-04 13:33:25 +0100404 struct cpufreq_frequency_table *pxa255_freq_table;
405 pxa_freqs_t *pxa255_freqs;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100406
407 /* try to guess pxa27x cpu */
408 if (cpu_is_pxa27x())
409 pxa27x_guess_max_freq();
Russell King9e2697f2007-12-14 13:30:14 +0000410
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200411 pxa_cpufreq_init_voltages();
412
Philipp Zabela10c2872008-06-29 16:53:34 +0200413 init_sdram_rows();
414
Russell King9e2697f2007-12-14 13:30:14 +0000415 /* set default policy and cpuinfo */
Russell King9e2697f2007-12-14 13:30:14 +0000416 policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
Robert Jarzmik36793892008-05-07 20:36:34 +0100417 policy->cur = get_clk_frequency_khz(0); /* current freq */
Russell King9e2697f2007-12-14 13:30:14 +0000418 policy->min = policy->max = policy->cur;
419
Robert Jarzmik592eb992008-05-07 20:39:06 +0100420 /* Generate pxa25x the run cpufreq_frequency_table struct */
421 for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) {
Russell King9e2697f2007-12-14 13:30:14 +0000422 pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz;
423 pxa255_run_freq_table[i].index = i;
424 }
Russell King9e2697f2007-12-14 13:30:14 +0000425 pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100426
427 /* Generate pxa25x the turbo cpufreq_frequency_table struct */
428 for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) {
Robert Jarzmik36793892008-05-07 20:36:34 +0100429 pxa255_turbo_freq_table[i].frequency =
430 pxa255_turbo_freqs[i].khz;
Russell King9e2697f2007-12-14 13:30:14 +0000431 pxa255_turbo_freq_table[i].index = i;
432 }
433 pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END;
434
Marc Zyngier65587f72008-11-04 13:33:25 +0100435 pxa255_turbo_table = !!pxa255_turbo_table;
436
Robert Jarzmik592eb992008-05-07 20:39:06 +0100437 /* Generate the pxa27x cpufreq_frequency_table struct */
438 for (i = 0; i < NUM_PXA27x_FREQS; i++) {
439 freq = pxa27x_freqs[i].khz;
440 if (freq > pxa27x_maxfreq)
441 break;
442 pxa27x_freq_table[i].frequency = freq;
443 pxa27x_freq_table[i].index = i;
444 }
Daniel Mack68a31de2009-11-20 17:50:34 +0100445 pxa27x_freq_table[i].index = i;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100446 pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END;
447
448 /*
449 * Set the policy's minimum and maximum frequencies from the tables
450 * just constructed. This sets cpuinfo.mxx_freq, min and max.
451 */
Marc Zyngier65587f72008-11-04 13:33:25 +0100452 if (cpu_is_pxa25x()) {
453 find_freq_tables(&pxa255_freq_table, &pxa255_freqs);
454 pr_info("PXA255 cpufreq using %s frequency table\n",
455 pxa255_turbo_table ? "turbo" : "run");
456 cpufreq_frequency_table_cpuinfo(policy, pxa255_freq_table);
457 }
Robert Jarzmik592eb992008-05-07 20:39:06 +0100458 else if (cpu_is_pxa27x())
459 cpufreq_frequency_table_cpuinfo(policy, pxa27x_freq_table);
460
Russell King9e2697f2007-12-14 13:30:14 +0000461 printk(KERN_INFO "PXA CPU frequency change support initialized\n");
462
463 return 0;
464}
465
466static struct cpufreq_driver pxa_cpufreq_driver = {
467 .verify = pxa_verify_policy,
468 .target = pxa_set_target,
469 .init = pxa_cpufreq_init,
Holger Schurigea833f02008-02-11 16:53:15 +0100470 .get = pxa_cpufreq_get,
Robert Jarzmik592eb992008-05-07 20:39:06 +0100471 .name = "PXA2xx",
Russell King9e2697f2007-12-14 13:30:14 +0000472};
473
474static int __init pxa_cpu_init(void)
475{
476 int ret = -ENODEV;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100477 if (cpu_is_pxa25x() || cpu_is_pxa27x())
Russell King9e2697f2007-12-14 13:30:14 +0000478 ret = cpufreq_register_driver(&pxa_cpufreq_driver);
479 return ret;
480}
481
482static void __exit pxa_cpu_exit(void)
483{
Robert Jarzmik592eb992008-05-07 20:39:06 +0100484 cpufreq_unregister_driver(&pxa_cpufreq_driver);
Russell King9e2697f2007-12-14 13:30:14 +0000485}
486
487
Robert Jarzmik36793892008-05-07 20:36:34 +0100488MODULE_AUTHOR("Intrinsyc Software Inc.");
489MODULE_DESCRIPTION("CPU frequency changing driver for the PXA architecture");
Russell King9e2697f2007-12-14 13:30:14 +0000490MODULE_LICENSE("GPL");
491module_init(pxa_cpu_init);
492module_exit(pxa_cpu_exit);