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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
Joe Perches1c5864e2016-04-05 13:28:25 -070032#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
Russell King9e2697f2007-12-14 13:30:14 +000034#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/sched.h>
37#include <linux/init.h>
38#include <linux/cpufreq.h>
Robert Jarzmik3dbeef22009-05-17 23:03:55 +020039#include <linux/err.h>
40#include <linux/regulator/consumer.h>
Marek Vasutad68bb92010-11-03 16:29:35 +010041#include <linux/io.h>
Russell King9e2697f2007-12-14 13:30:14 +000042
Russell Kinga09e64f2008-08-05 16:14:15 +010043#include <mach/pxa2xx-regs.h>
Marek Vasutad68bb92010-11-03 16:29:35 +010044#include <mach/smemc.h>
Russell King9e2697f2007-12-14 13:30:14 +000045
46#ifdef DEBUG
47static unsigned int freq_debug;
Randy Dunlapc710e392008-02-27 12:11:16 -080048module_param(freq_debug, uint, 0);
Russell King9e2697f2007-12-14 13:30:14 +000049MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
50#else
51#define freq_debug 0
52#endif
53
Robert Jarzmik3dbeef22009-05-17 23:03:55 +020054static struct regulator *vcc_core;
55
Robert Jarzmik592eb992008-05-07 20:39:06 +010056static 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
Fabian Frederick52352552015-05-01 10:34:00 +020061struct pxa_freqs {
Russell King9e2697f2007-12-14 13:30:14 +000062 unsigned int khz;
63 unsigned int membus;
64 unsigned int cccr;
65 unsigned int div2;
Robert Jarzmik592eb992008-05-07 20:39:06 +010066 unsigned int cclkcfg;
Robert Jarzmik3dbeef22009-05-17 23:03:55 +020067 int vmin;
68 int vmax;
Fabian Frederick52352552015-05-01 10:34:00 +020069};
Russell King9e2697f2007-12-14 13:30:14 +000070
71/* Define the refresh period in mSec for the SDRAM and the number of rows */
Robert Jarzmik36793892008-05-07 20:36:34 +010072#define SDRAM_TREF 64 /* standard 64ms SDRAM */
Philipp Zabela10c2872008-06-29 16:53:34 +020073static unsigned int sdram_rows;
Russell King9e2697f2007-12-14 13:30:14 +000074
Robert Jarzmik36793892008-05-07 20:36:34 +010075#define CCLKCFG_TURBO 0x1
76#define CCLKCFG_FCS 0x2
Robert Jarzmik592eb992008-05-07 20:39:06 +010077#define CCLKCFG_HALFTURBO 0x4
78#define CCLKCFG_FASTBUS 0x8
Robert Jarzmik36793892008-05-07 20:36:34 +010079#define MDREFR_DB2_MASK (MDREFR_K2DB2 | MDREFR_K1DB2)
80#define MDREFR_DRI_MASK 0xFFF
Russell King9e2697f2007-12-14 13:30:14 +000081
Philipp Zabela10c2872008-06-29 16:53:34 +020082#define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3)
83#define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3)
84
Robert Jarzmik592eb992008-05-07 20:39:06 +010085/*
86 * PXA255 definitions
87 */
Russell King9e2697f2007-12-14 13:30:14 +000088/* Use the run mode frequencies for the CPUFREQ_POLICY_PERFORMANCE policy */
Robert Jarzmik592eb992008-05-07 20:39:06 +010089#define CCLKCFG CCLKCFG_TURBO | CCLKCFG_FCS
90
Fabian Frederick03c22992015-05-01 10:34:01 +020091static const struct pxa_freqs pxa255_run_freqs[] =
Russell King9e2697f2007-12-14 13:30:14 +000092{
Robert Jarzmik3dbeef22009-05-17 23:03:55 +020093 /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */
94 { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */
95 {132700, 132700, 0x123, 1, CCLKCFG, -1, -1}, /* 133, 133, 66, 66 */
96 {199100, 99500, 0x141, 0, CCLKCFG, -1, -1}, /* 199, 199, 99, 99 */
97 {265400, 132700, 0x143, 1, CCLKCFG, -1, -1}, /* 265, 265, 133, 66 */
98 {331800, 165900, 0x145, 1, CCLKCFG, -1, -1}, /* 331, 331, 166, 83 */
99 {398100, 99500, 0x161, 0, CCLKCFG, -1, -1}, /* 398, 398, 196, 99 */
Russell King9e2697f2007-12-14 13:30:14 +0000100};
Russell King9e2697f2007-12-14 13:30:14 +0000101
102/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */
Fabian Frederick03c22992015-05-01 10:34:01 +0200103static const struct pxa_freqs pxa255_turbo_freqs[] =
Russell King9e2697f2007-12-14 13:30:14 +0000104{
Robert Jarzmik592eb992008-05-07 20:39:06 +0100105 /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200106 { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */
107 {199100, 99500, 0x221, 0, CCLKCFG, -1, -1}, /* 99, 199, 50, 99 */
108 {298500, 99500, 0x321, 0, CCLKCFG, -1, -1}, /* 99, 287, 50, 99 */
109 {298600, 99500, 0x1c1, 0, CCLKCFG, -1, -1}, /* 199, 287, 99, 99 */
110 {398100, 99500, 0x241, 0, CCLKCFG, -1, -1}, /* 199, 398, 99, 99 */
Russell King9e2697f2007-12-14 13:30:14 +0000111};
Robert Jarzmik592eb992008-05-07 20:39:06 +0100112
113#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)
114#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs)
Russell King9e2697f2007-12-14 13:30:14 +0000115
Robert Jarzmik36793892008-05-07 20:36:34 +0100116static struct cpufreq_frequency_table
Robert Jarzmik592eb992008-05-07 20:39:06 +0100117 pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1];
118static struct cpufreq_frequency_table
119 pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];
120
Marc Zyngier65587f72008-11-04 13:33:25 +0100121static unsigned int pxa255_turbo_table;
122module_param(pxa255_turbo_table, uint, 0);
123MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)");
124
Robert Jarzmik592eb992008-05-07 20:39:06 +0100125/*
126 * PXA270 definitions
127 *
128 * For the PXA27x:
129 * Control variables are A, L, 2N for CCCR; B, HT, T for CLKCFG.
130 *
131 * A = 0 => memory controller clock from table 3-7,
132 * A = 1 => memory controller clock = system bus clock
133 * Run mode frequency = 13 MHz * L
134 * Turbo mode frequency = 13 MHz * L * N
135 * System bus frequency = 13 MHz * L / (B + 1)
136 *
137 * In CCCR:
138 * A = 1
139 * L = 16 oscillator to run mode ratio
140 * 2N = 6 2 * (turbo mode to run mode ratio)
141 *
142 * In CCLKCFG:
143 * B = 1 Fast bus mode
144 * HT = 0 Half-Turbo mode
145 * T = 1 Turbo mode
146 *
147 * For now, just support some of the combinations in table 3-7 of
148 * PXA27x Processor Family Developer's Manual to simplify frequency
149 * change sequences.
150 */
151#define PXA27x_CCCR(A, L, N2) (A << 25 | N2 << 7 | L)
152#define CCLKCFG2(B, HT, T) \
153 (CCLKCFG_FCS | \
154 ((B) ? CCLKCFG_FASTBUS : 0) | \
155 ((HT) ? CCLKCFG_HALFTURBO : 0) | \
156 ((T) ? CCLKCFG_TURBO : 0))
157
Fabian Frederick52352552015-05-01 10:34:00 +0200158static struct pxa_freqs pxa27x_freqs[] = {
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200159 {104000, 104000, PXA27x_CCCR(1, 8, 2), 0, CCLKCFG2(1, 0, 1), 900000, 1705000 },
Dennis O'Brien43672162009-10-10 15:08:52 +0800160 {156000, 104000, PXA27x_CCCR(1, 8, 3), 0, CCLKCFG2(1, 0, 1), 1000000, 1705000 },
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200161 {208000, 208000, PXA27x_CCCR(0, 16, 2), 1, CCLKCFG2(0, 0, 1), 1180000, 1705000 },
162 {312000, 208000, PXA27x_CCCR(1, 16, 3), 1, CCLKCFG2(1, 0, 1), 1250000, 1705000 },
163 {416000, 208000, PXA27x_CCCR(1, 16, 4), 1, CCLKCFG2(1, 0, 1), 1350000, 1705000 },
164 {520000, 208000, PXA27x_CCCR(1, 16, 5), 1, CCLKCFG2(1, 0, 1), 1450000, 1705000 },
165 {624000, 208000, PXA27x_CCCR(1, 16, 6), 1, CCLKCFG2(1, 0, 1), 1550000, 1705000 }
Robert Jarzmik592eb992008-05-07 20:39:06 +0100166};
167
168#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs)
169static struct cpufreq_frequency_table
170 pxa27x_freq_table[NUM_PXA27x_FREQS+1];
Russell King9e2697f2007-12-14 13:30:14 +0000171
172extern unsigned get_clk_frequency_khz(int info);
173
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200174#ifdef CONFIG_REGULATOR
175
Fabian Frederick03c22992015-05-01 10:34:01 +0200176static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200177{
178 int ret = 0;
179 int vmin, vmax;
180
181 if (!cpu_is_pxa27x())
182 return 0;
183
184 vmin = pxa_freq->vmin;
185 vmax = pxa_freq->vmax;
186 if ((vmin == -1) || (vmax == -1))
187 return 0;
188
189 ret = regulator_set_voltage(vcc_core, vmin, vmax);
190 if (ret)
Joe Perches1c5864e2016-04-05 13:28:25 -0700191 pr_err("Failed to set vcc_core in [%dmV..%dmV]\n", vmin, vmax);
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200192 return ret;
193}
194
Hanjun Guo295dbde2013-08-13 18:20:09 +0800195static void __init pxa_cpufreq_init_voltages(void)
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200196{
197 vcc_core = regulator_get(NULL, "vcc_core");
198 if (IS_ERR(vcc_core)) {
Joe Perches1c5864e2016-04-05 13:28:25 -0700199 pr_info("Didn't find vcc_core regulator\n");
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200200 vcc_core = NULL;
201 } else {
Joe Perches1c5864e2016-04-05 13:28:25 -0700202 pr_info("Found vcc_core regulator\n");
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200203 }
204}
205#else
Arnd Bergmannfb2a24a2016-01-25 16:44:38 +0100206static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200207{
208 return 0;
209}
210
Hanjun Guo295dbde2013-08-13 18:20:09 +0800211static void __init pxa_cpufreq_init_voltages(void) { }
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200212#endif
213
Marc Zyngier65587f72008-11-04 13:33:25 +0100214static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
Fabian Frederick03c22992015-05-01 10:34:01 +0200215 const struct pxa_freqs **pxa_freqs)
Robert Jarzmik592eb992008-05-07 20:39:06 +0100216{
217 if (cpu_is_pxa25x()) {
Marc Zyngier65587f72008-11-04 13:33:25 +0100218 if (!pxa255_turbo_table) {
Robert Jarzmik592eb992008-05-07 20:39:06 +0100219 *pxa_freqs = pxa255_run_freqs;
220 *freq_table = pxa255_run_freq_table;
Marc Zyngier65587f72008-11-04 13:33:25 +0100221 } else {
Robert Jarzmik592eb992008-05-07 20:39:06 +0100222 *pxa_freqs = pxa255_turbo_freqs;
223 *freq_table = pxa255_turbo_freq_table;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100224 }
Arnd Bergmann7264a2b2013-04-25 19:28:57 +0200225 } else if (cpu_is_pxa27x()) {
Robert Jarzmik592eb992008-05-07 20:39:06 +0100226 *pxa_freqs = pxa27x_freqs;
227 *freq_table = pxa27x_freq_table;
Arnd Bergmann7264a2b2013-04-25 19:28:57 +0200228 } else {
229 BUG();
Robert Jarzmik592eb992008-05-07 20:39:06 +0100230 }
231}
232
233static void pxa27x_guess_max_freq(void)
234{
235 if (!pxa27x_maxfreq) {
236 pxa27x_maxfreq = 416000;
Joe Perchesb49c22a2016-04-05 13:28:24 -0700237 pr_info("PXA CPU 27x max frequency not defined (pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n",
238 pxa27x_maxfreq);
Robert Jarzmik592eb992008-05-07 20:39:06 +0100239 } 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
Robert Jarzmik592eb992008-05-07 20:39:06 +0100265static unsigned int pxa_cpufreq_get(unsigned int cpu)
266{
267 return get_clk_frequency_khz(0);
268}
269
Viresh Kumar9c0ebcf2013-10-25 19:45:48 +0530270static int pxa_set_target(struct cpufreq_policy *policy, unsigned int idx)
Russell King9e2697f2007-12-14 13:30:14 +0000271{
272 struct cpufreq_frequency_table *pxa_freqs_table;
Fabian Frederick03c22992015-05-01 10:34:01 +0200273 const struct pxa_freqs *pxa_freq_settings;
Russell King9e2697f2007-12-14 13:30:14 +0000274 unsigned long flags;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100275 unsigned int new_freq_cpu, new_freq_mem;
276 unsigned int unused, preset_mdrefr, postset_mdrefr, cclkcfg;
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200277 int ret = 0;
Russell King9e2697f2007-12-14 13:30:14 +0000278
279 /* Get the current policy */
Marc Zyngier65587f72008-11-04 13:33:25 +0100280 find_freq_tables(&pxa_freqs_table, &pxa_freq_settings);
Russell King9e2697f2007-12-14 13:30:14 +0000281
Robert Jarzmik592eb992008-05-07 20:39:06 +0100282 new_freq_cpu = pxa_freq_settings[idx].khz;
283 new_freq_mem = pxa_freq_settings[idx].membus;
Russell King9e2697f2007-12-14 13:30:14 +0000284
285 if (freq_debug)
Joe Perchesd4202802010-09-11 22:10:49 -0700286 pr_debug("Changing CPU frequency to %d Mhz, (SDRAM %d Mhz)\n",
Viresh Kumard4019f02013-08-14 19:38:24 +0530287 new_freq_cpu / 1000, (pxa_freq_settings[idx].div2) ?
Robert Jarzmik592eb992008-05-07 20:39:06 +0100288 (new_freq_mem / 2000) : (new_freq_mem / 1000));
Russell King9e2697f2007-12-14 13:30:14 +0000289
Viresh Kumard4019f02013-08-14 19:38:24 +0530290 if (vcc_core && new_freq_cpu > policy->cur) {
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200291 ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
Viresh Kumard4019f02013-08-14 19:38:24 +0530292 if (ret)
293 return ret;
294 }
Russell King9e2697f2007-12-14 13:30:14 +0000295
296 /* Calculate the next MDREFR. If we're slowing down the SDRAM clock
Robert Jarzmik36793892008-05-07 20:36:34 +0100297 * we need to preset the smaller DRI before the change. If we're
298 * speeding up we need to set the larger DRI value after the change.
Russell King9e2697f2007-12-14 13:30:14 +0000299 */
Marek Vasutad68bb92010-11-03 16:29:35 +0100300 preset_mdrefr = postset_mdrefr = __raw_readl(MDREFR);
301 if ((preset_mdrefr & MDREFR_DRI_MASK) > mdrefr_dri(new_freq_mem)) {
Robert Jarzmik592eb992008-05-07 20:39:06 +0100302 preset_mdrefr = (preset_mdrefr & ~MDREFR_DRI_MASK);
303 preset_mdrefr |= mdrefr_dri(new_freq_mem);
Russell King9e2697f2007-12-14 13:30:14 +0000304 }
Robert Jarzmik592eb992008-05-07 20:39:06 +0100305 postset_mdrefr =
306 (postset_mdrefr & ~MDREFR_DRI_MASK) | mdrefr_dri(new_freq_mem);
Russell King9e2697f2007-12-14 13:30:14 +0000307
308 /* If we're dividing the memory clock by two for the SDRAM clock, this
309 * must be set prior to the change. Clearing the divide must be done
310 * after the change.
311 */
312 if (pxa_freq_settings[idx].div2) {
313 preset_mdrefr |= MDREFR_DB2_MASK;
314 postset_mdrefr |= MDREFR_DB2_MASK;
315 } else {
316 postset_mdrefr &= ~MDREFR_DB2_MASK;
317 }
318
319 local_irq_save(flags);
320
Robert Jarzmik592eb992008-05-07 20:39:06 +0100321 /* Set new the CCCR and prepare CCLKCFG */
Arnd Bergmannea7743e2016-01-29 15:06:25 +0100322 writel(pxa_freq_settings[idx].cccr, CCCR);
Robert Jarzmik592eb992008-05-07 20:39:06 +0100323 cclkcfg = pxa_freq_settings[idx].cclkcfg;
Russell King9e2697f2007-12-14 13:30:14 +0000324
325 asm volatile(" \n\
326 ldr r4, [%1] /* load MDREFR */ \n\
327 b 2f \n\
Robert Jarzmik36793892008-05-07 20:36:34 +0100328 .align 5 \n\
Russell King9e2697f2007-12-14 13:30:14 +00003291: \n\
Robert Jarzmik592eb992008-05-07 20:39:06 +0100330 str %3, [%1] /* preset the MDREFR */ \n\
Russell King9e2697f2007-12-14 13:30:14 +0000331 mcr p14, 0, %2, c6, c0, 0 /* set CCLKCFG[FCS] */ \n\
Robert Jarzmik592eb992008-05-07 20:39:06 +0100332 str %4, [%1] /* postset the MDREFR */ \n\
Russell King9e2697f2007-12-14 13:30:14 +0000333 \n\
334 b 3f \n\
3352: b 1b \n\
3363: nop \n\
337 "
Robert Jarzmik36793892008-05-07 20:36:34 +0100338 : "=&r" (unused)
Marek Vasutad68bb92010-11-03 16:29:35 +0100339 : "r" (MDREFR), "r" (cclkcfg),
Robert Jarzmik592eb992008-05-07 20:39:06 +0100340 "r" (preset_mdrefr), "r" (postset_mdrefr)
Robert Jarzmik36793892008-05-07 20:36:34 +0100341 : "r4", "r5");
Russell King9e2697f2007-12-14 13:30:14 +0000342 local_irq_restore(flags);
343
344 /*
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200345 * Even if voltage setting fails, we don't report it, as the frequency
346 * change succeeded. The voltage reduction is not a critical failure,
347 * only power savings will suffer from this.
348 *
349 * Note: if the voltage change fails, and a return value is returned, a
350 * bug is triggered (seems a deadlock). Should anybody find out where,
351 * the "return 0" should become a "return ret".
352 */
Viresh Kumard4019f02013-08-14 19:38:24 +0530353 if (vcc_core && new_freq_cpu < policy->cur)
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200354 ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
355
Russell King9e2697f2007-12-14 13:30:14 +0000356 return 0;
357}
358
Eric Miao50e77fc2010-08-18 11:51:13 +0800359static int pxa_cpufreq_init(struct cpufreq_policy *policy)
Russell King9e2697f2007-12-14 13:30:14 +0000360{
361 int i;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100362 unsigned int freq;
Marc Zyngier65587f72008-11-04 13:33:25 +0100363 struct cpufreq_frequency_table *pxa255_freq_table;
Fabian Frederick03c22992015-05-01 10:34:01 +0200364 const struct pxa_freqs *pxa255_freqs;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100365
366 /* try to guess pxa27x cpu */
367 if (cpu_is_pxa27x())
368 pxa27x_guess_max_freq();
Russell King9e2697f2007-12-14 13:30:14 +0000369
Robert Jarzmik3dbeef22009-05-17 23:03:55 +0200370 pxa_cpufreq_init_voltages();
371
Philipp Zabela10c2872008-06-29 16:53:34 +0200372 init_sdram_rows();
373
Russell King9e2697f2007-12-14 13:30:14 +0000374 /* set default policy and cpuinfo */
Russell King9e2697f2007-12-14 13:30:14 +0000375 policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
Russell King9e2697f2007-12-14 13:30:14 +0000376
Robert Jarzmik592eb992008-05-07 20:39:06 +0100377 /* Generate pxa25x the run cpufreq_frequency_table struct */
378 for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) {
Russell King9e2697f2007-12-14 13:30:14 +0000379 pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz;
Viresh Kumar50701582013-03-30 16:25:15 +0530380 pxa255_run_freq_table[i].driver_data = i;
Russell King9e2697f2007-12-14 13:30:14 +0000381 }
Russell King9e2697f2007-12-14 13:30:14 +0000382 pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100383
384 /* Generate pxa25x the turbo cpufreq_frequency_table struct */
385 for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) {
Robert Jarzmik36793892008-05-07 20:36:34 +0100386 pxa255_turbo_freq_table[i].frequency =
387 pxa255_turbo_freqs[i].khz;
Viresh Kumar50701582013-03-30 16:25:15 +0530388 pxa255_turbo_freq_table[i].driver_data = i;
Russell King9e2697f2007-12-14 13:30:14 +0000389 }
390 pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END;
391
Marc Zyngier65587f72008-11-04 13:33:25 +0100392 pxa255_turbo_table = !!pxa255_turbo_table;
393
Robert Jarzmik592eb992008-05-07 20:39:06 +0100394 /* Generate the pxa27x cpufreq_frequency_table struct */
395 for (i = 0; i < NUM_PXA27x_FREQS; i++) {
396 freq = pxa27x_freqs[i].khz;
397 if (freq > pxa27x_maxfreq)
398 break;
399 pxa27x_freq_table[i].frequency = freq;
Viresh Kumar50701582013-03-30 16:25:15 +0530400 pxa27x_freq_table[i].driver_data = i;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100401 }
Viresh Kumar50701582013-03-30 16:25:15 +0530402 pxa27x_freq_table[i].driver_data = i;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100403 pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END;
404
405 /*
406 * Set the policy's minimum and maximum frequencies from the tables
407 * just constructed. This sets cpuinfo.mxx_freq, min and max.
408 */
Marc Zyngier65587f72008-11-04 13:33:25 +0100409 if (cpu_is_pxa25x()) {
410 find_freq_tables(&pxa255_freq_table, &pxa255_freqs);
Joe Perches1c5864e2016-04-05 13:28:25 -0700411 pr_info("using %s frequency table\n",
Marc Zyngier65587f72008-11-04 13:33:25 +0100412 pxa255_turbo_table ? "turbo" : "run");
Viresh Kumar6a77a1e2013-09-16 18:56:04 +0530413
Viresh Kumar15cc9212013-09-16 18:56:29 +0530414 cpufreq_table_validate_and_show(policy, pxa255_freq_table);
Marc Zyngier65587f72008-11-04 13:33:25 +0100415 }
Viresh Kumar6a77a1e2013-09-16 18:56:04 +0530416 else if (cpu_is_pxa27x()) {
Viresh Kumar15cc9212013-09-16 18:56:29 +0530417 cpufreq_table_validate_and_show(policy, pxa27x_freq_table);
Viresh Kumar6a77a1e2013-09-16 18:56:04 +0530418 }
Robert Jarzmik592eb992008-05-07 20:39:06 +0100419
Joe Perches1c5864e2016-04-05 13:28:25 -0700420 pr_info("frequency change support initialized\n");
Russell King9e2697f2007-12-14 13:30:14 +0000421
422 return 0;
423}
424
425static struct cpufreq_driver pxa_cpufreq_driver = {
Viresh Kumarae6b4272013-12-03 11:20:45 +0530426 .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
Viresh Kumarbf36e482013-10-03 20:28:20 +0530427 .verify = cpufreq_generic_frequency_table_verify,
Viresh Kumar9c0ebcf2013-10-25 19:45:48 +0530428 .target_index = pxa_set_target,
Russell King9e2697f2007-12-14 13:30:14 +0000429 .init = pxa_cpufreq_init,
Holger Schurigea833f02008-02-11 16:53:15 +0100430 .get = pxa_cpufreq_get,
Robert Jarzmik592eb992008-05-07 20:39:06 +0100431 .name = "PXA2xx",
Russell King9e2697f2007-12-14 13:30:14 +0000432};
433
434static int __init pxa_cpu_init(void)
435{
436 int ret = -ENODEV;
Robert Jarzmik592eb992008-05-07 20:39:06 +0100437 if (cpu_is_pxa25x() || cpu_is_pxa27x())
Russell King9e2697f2007-12-14 13:30:14 +0000438 ret = cpufreq_register_driver(&pxa_cpufreq_driver);
439 return ret;
440}
441
442static void __exit pxa_cpu_exit(void)
443{
Robert Jarzmik592eb992008-05-07 20:39:06 +0100444 cpufreq_unregister_driver(&pxa_cpufreq_driver);
Russell King9e2697f2007-12-14 13:30:14 +0000445}
446
447
Robert Jarzmik36793892008-05-07 20:36:34 +0100448MODULE_AUTHOR("Intrinsyc Software Inc.");
449MODULE_DESCRIPTION("CPU frequency changing driver for the PXA architecture");
Russell King9e2697f2007-12-14 13:30:14 +0000450MODULE_LICENSE("GPL");
451module_init(pxa_cpu_init);
452module_exit(pxa_cpu_exit);