2 * Copyright (c) 2010-2012 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com
5 * EXYNOS4X12 - CPU frequency scaling support
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/err.h>
15 #include <linux/clk.h>
17 #include <linux/slab.h>
18 #include <linux/cpufreq.h>
20 #include <mach/regs-clock.h>
22 #include "exynos-cpufreq.h"
24 #define CPUFREQ_LEVEL_END (L13 + 1)
26 static int max_support_idx;
27 static int min_support_idx = (CPUFREQ_LEVEL_END - 1);
29 static struct clk *cpu_clk;
30 static struct clk *moutcore;
31 static struct clk *mout_mpll;
32 static struct clk *mout_apll;
34 struct cpufreq_clkdiv {
40 static unsigned int exynos4x12_volt_table[CPUFREQ_LEVEL_END];
42 static struct cpufreq_frequency_table exynos4x12_freq_table[] = {
57 {0, CPUFREQ_TABLE_END},
60 static struct cpufreq_clkdiv exynos4x12_clkdiv_table[CPUFREQ_LEVEL_END];
62 static unsigned int clkdiv_cpu0_4212[CPUFREQ_LEVEL_END][8] = {
64 * Clock divider value for following
65 * { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH,
66 * DIVATB, DIVPCLK_DBG, DIVAPLL, DIVCORE2 }
68 /* ARM L0: 1500 MHz */
69 { 0, 3, 7, 0, 6, 1, 2, 0 },
71 /* ARM L1: 1400 MHz */
72 { 0, 3, 7, 0, 6, 1, 2, 0 },
74 /* ARM L2: 1300 MHz */
75 { 0, 3, 7, 0, 5, 1, 2, 0 },
77 /* ARM L3: 1200 MHz */
78 { 0, 3, 7, 0, 5, 1, 2, 0 },
80 /* ARM L4: 1100 MHz */
81 { 0, 3, 6, 0, 4, 1, 2, 0 },
83 /* ARM L5: 1000 MHz */
84 { 0, 2, 5, 0, 4, 1, 1, 0 },
87 { 0, 2, 5, 0, 3, 1, 1, 0 },
90 { 0, 2, 5, 0, 3, 1, 1, 0 },
93 { 0, 2, 4, 0, 3, 1, 1, 0 },
96 { 0, 2, 4, 0, 3, 1, 1, 0 },
98 /* ARM L10: 500 MHz */
99 { 0, 2, 4, 0, 3, 1, 1, 0 },
101 /* ARM L11: 400 MHz */
102 { 0, 2, 4, 0, 3, 1, 1, 0 },
104 /* ARM L12: 300 MHz */
105 { 0, 2, 4, 0, 2, 1, 1, 0 },
107 /* ARM L13: 200 MHz */
108 { 0, 1, 3, 0, 1, 1, 1, 0 },
111 static unsigned int clkdiv_cpu0_4412[CPUFREQ_LEVEL_END][8] = {
113 * Clock divider value for following
114 * { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH,
115 * DIVATB, DIVPCLK_DBG, DIVAPLL, DIVCORE2 }
117 /* ARM L0: 1500 MHz */
118 { 0, 3, 7, 0, 6, 1, 2, 0 },
120 /* ARM L1: 1400 MHz */
121 { 0, 3, 7, 0, 6, 1, 2, 0 },
123 /* ARM L2: 1300 MHz */
124 { 0, 3, 7, 0, 5, 1, 2, 0 },
126 /* ARM L3: 1200 MHz */
127 { 0, 3, 7, 0, 5, 1, 2, 0 },
129 /* ARM L4: 1100 MHz */
130 { 0, 3, 6, 0, 4, 1, 2, 0 },
132 /* ARM L5: 1000 MHz */
133 { 0, 2, 5, 0, 4, 1, 1, 0 },
135 /* ARM L6: 900 MHz */
136 { 0, 2, 5, 0, 3, 1, 1, 0 },
138 /* ARM L7: 800 MHz */
139 { 0, 2, 5, 0, 3, 1, 1, 0 },
141 /* ARM L8: 700 MHz */
142 { 0, 2, 4, 0, 3, 1, 1, 0 },
144 /* ARM L9: 600 MHz */
145 { 0, 2, 4, 0, 3, 1, 1, 0 },
147 /* ARM L10: 500 MHz */
148 { 0, 2, 4, 0, 3, 1, 1, 0 },
150 /* ARM L11: 400 MHz */
151 { 0, 2, 4, 0, 3, 1, 1, 0 },
153 /* ARM L12: 300 MHz */
154 { 0, 2, 4, 0, 2, 1, 1, 0 },
156 /* ARM L13: 200 MHz */
157 { 0, 1, 3, 0, 1, 1, 1, 0 },
160 static unsigned int clkdiv_cpu1_4212[CPUFREQ_LEVEL_END][2] = {
161 /* Clock divider value for following
162 * { DIVCOPY, DIVHPM }
164 /* ARM L0: 1500 MHz */
167 /* ARM L1: 1400 MHz */
170 /* ARM L2: 1300 MHz */
173 /* ARM L3: 1200 MHz */
176 /* ARM L4: 1100 MHz */
179 /* ARM L5: 1000 MHz */
182 /* ARM L6: 900 MHz */
185 /* ARM L7: 800 MHz */
188 /* ARM L8: 700 MHz */
191 /* ARM L9: 600 MHz */
194 /* ARM L10: 500 MHz */
197 /* ARM L11: 400 MHz */
200 /* ARM L12: 300 MHz */
203 /* ARM L13: 200 MHz */
207 static unsigned int clkdiv_cpu1_4412[CPUFREQ_LEVEL_END][3] = {
208 /* Clock divider value for following
209 * { DIVCOPY, DIVHPM, DIVCORES }
211 /* ARM L0: 1500 MHz */
214 /* ARM L1: 1400 MHz */
217 /* ARM L2: 1300 MHz */
220 /* ARM L3: 1200 MHz */
223 /* ARM L4: 1100 MHz */
226 /* ARM L5: 1000 MHz */
229 /* ARM L6: 900 MHz */
232 /* ARM L7: 800 MHz */
235 /* ARM L8: 700 MHz */
238 /* ARM L9: 600 MHz */
241 /* ARM L10: 500 MHz */
244 /* ARM L11: 400 MHz */
247 /* ARM L12: 300 MHz */
250 /* ARM L13: 200 MHz */
254 static unsigned int exynos4x12_apll_pms_table[CPUFREQ_LEVEL_END] = {
255 /* APLL FOUT L0: 1500 MHz */
256 ((250 << 16) | (4 << 8) | (0x0)),
258 /* APLL FOUT L1: 1400 MHz */
259 ((175 << 16) | (3 << 8) | (0x0)),
261 /* APLL FOUT L2: 1300 MHz */
262 ((325 << 16) | (6 << 8) | (0x0)),
264 /* APLL FOUT L3: 1200 MHz */
265 ((200 << 16) | (4 << 8) | (0x0)),
267 /* APLL FOUT L4: 1100 MHz */
268 ((275 << 16) | (6 << 8) | (0x0)),
270 /* APLL FOUT L5: 1000 MHz */
271 ((125 << 16) | (3 << 8) | (0x0)),
273 /* APLL FOUT L6: 900 MHz */
274 ((150 << 16) | (4 << 8) | (0x0)),
276 /* APLL FOUT L7: 800 MHz */
277 ((100 << 16) | (3 << 8) | (0x0)),
279 /* APLL FOUT L8: 700 MHz */
280 ((175 << 16) | (3 << 8) | (0x1)),
282 /* APLL FOUT L9: 600 MHz */
283 ((200 << 16) | (4 << 8) | (0x1)),
285 /* APLL FOUT L10: 500 MHz */
286 ((125 << 16) | (3 << 8) | (0x1)),
288 /* APLL FOUT L11 400 MHz */
289 ((100 << 16) | (3 << 8) | (0x1)),
291 /* APLL FOUT L12: 300 MHz */
292 ((200 << 16) | (4 << 8) | (0x2)),
294 /* APLL FOUT L13: 200 MHz */
295 ((100 << 16) | (3 << 8) | (0x2)),
298 static const unsigned int asv_voltage_4x12[CPUFREQ_LEVEL_END] = {
299 1350000, 1287500, 1250000, 1187500, 1137500, 1087500, 1037500,
300 1000000, 987500, 975000, 950000, 925000, 900000, 900000
303 static void exynos4x12_set_clkdiv(unsigned int div_index)
306 unsigned int stat_cpu1;
308 /* Change Divider - CPU0 */
310 tmp = exynos4x12_clkdiv_table[div_index].clkdiv;
312 __raw_writel(tmp, EXYNOS4_CLKDIV_CPU);
314 while (__raw_readl(EXYNOS4_CLKDIV_STATCPU) & 0x11111111)
317 /* Change Divider - CPU1 */
318 tmp = exynos4x12_clkdiv_table[div_index].clkdiv1;
320 __raw_writel(tmp, EXYNOS4_CLKDIV_CPU1);
321 if (soc_is_exynos4212())
326 while (__raw_readl(EXYNOS4_CLKDIV_STATCPU1) & stat_cpu1)
330 static void exynos4x12_set_apll(unsigned int index)
332 unsigned int tmp, pdiv;
334 /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
335 clk_set_parent(moutcore, mout_mpll);
339 tmp = (__raw_readl(EXYNOS4_CLKMUX_STATCPU)
340 >> EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT);
342 } while (tmp != 0x2);
344 /* 2. Set APLL Lock time */
345 pdiv = ((exynos4x12_apll_pms_table[index] >> 8) & 0x3f);
347 __raw_writel((pdiv * 250), EXYNOS4_APLL_LOCK);
349 /* 3. Change PLL PMS values */
350 tmp = __raw_readl(EXYNOS4_APLL_CON0);
351 tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0));
352 tmp |= exynos4x12_apll_pms_table[index];
353 __raw_writel(tmp, EXYNOS4_APLL_CON0);
355 /* 4. wait_lock_time */
358 tmp = __raw_readl(EXYNOS4_APLL_CON0);
359 } while (!(tmp & (0x1 << EXYNOS4_APLLCON0_LOCKED_SHIFT)));
361 /* 5. MUX_CORE_SEL = APLL */
362 clk_set_parent(moutcore, mout_apll);
366 tmp = __raw_readl(EXYNOS4_CLKMUX_STATCPU);
367 tmp &= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK;
368 } while (tmp != (0x1 << EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT));
371 bool exynos4x12_pms_change(unsigned int old_index, unsigned int new_index)
373 unsigned int old_pm = exynos4x12_apll_pms_table[old_index] >> 8;
374 unsigned int new_pm = exynos4x12_apll_pms_table[new_index] >> 8;
376 return (old_pm == new_pm) ? 0 : 1;
379 static void exynos4x12_set_frequency(unsigned int old_index,
380 unsigned int new_index)
384 if (old_index > new_index) {
385 if (!exynos4x12_pms_change(old_index, new_index)) {
386 /* 1. Change the system clock divider values */
387 exynos4x12_set_clkdiv(new_index);
388 /* 2. Change just s value in apll m,p,s value */
389 tmp = __raw_readl(EXYNOS4_APLL_CON0);
391 tmp |= (exynos4x12_apll_pms_table[new_index] & 0x7);
392 __raw_writel(tmp, EXYNOS4_APLL_CON0);
395 /* Clock Configuration Procedure */
396 /* 1. Change the system clock divider values */
397 exynos4x12_set_clkdiv(new_index);
398 /* 2. Change the apll m,p,s value */
399 exynos4x12_set_apll(new_index);
401 } else if (old_index < new_index) {
402 if (!exynos4x12_pms_change(old_index, new_index)) {
403 /* 1. Change just s value in apll m,p,s value */
404 tmp = __raw_readl(EXYNOS4_APLL_CON0);
406 tmp |= (exynos4x12_apll_pms_table[new_index] & 0x7);
407 __raw_writel(tmp, EXYNOS4_APLL_CON0);
408 /* 2. Change the system clock divider values */
409 exynos4x12_set_clkdiv(new_index);
411 /* Clock Configuration Procedure */
412 /* 1. Change the apll m,p,s value */
413 exynos4x12_set_apll(new_index);
414 /* 2. Change the system clock divider values */
415 exynos4x12_set_clkdiv(new_index);
420 static void __init set_volt_table(void)
424 max_support_idx = L1;
427 exynos4x12_freq_table[L0].frequency = CPUFREQ_ENTRY_INVALID;
429 for (i = 0 ; i < CPUFREQ_LEVEL_END ; i++)
430 exynos4x12_volt_table[i] = asv_voltage_4x12[i];
433 int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info)
441 cpu_clk = clk_get(NULL, "armclk");
443 return PTR_ERR(cpu_clk);
445 moutcore = clk_get(NULL, "moutcore");
446 if (IS_ERR(moutcore))
449 mout_mpll = clk_get(NULL, "mout_mpll");
450 if (IS_ERR(mout_mpll))
453 rate = clk_get_rate(mout_mpll) / 1000;
455 mout_apll = clk_get(NULL, "mout_apll");
456 if (IS_ERR(mout_apll))
459 for (i = L0; i < CPUFREQ_LEVEL_END; i++) {
461 exynos4x12_clkdiv_table[i].index = i;
463 tmp = __raw_readl(EXYNOS4_CLKDIV_CPU);
465 tmp &= ~(EXYNOS4_CLKDIV_CPU0_CORE_MASK |
466 EXYNOS4_CLKDIV_CPU0_COREM0_MASK |
467 EXYNOS4_CLKDIV_CPU0_COREM1_MASK |
468 EXYNOS4_CLKDIV_CPU0_PERIPH_MASK |
469 EXYNOS4_CLKDIV_CPU0_ATB_MASK |
470 EXYNOS4_CLKDIV_CPU0_PCLKDBG_MASK |
471 EXYNOS4_CLKDIV_CPU0_APLL_MASK);
473 if (soc_is_exynos4212()) {
474 tmp |= ((clkdiv_cpu0_4212[i][0] << EXYNOS4_CLKDIV_CPU0_CORE_SHIFT) |
475 (clkdiv_cpu0_4212[i][1] << EXYNOS4_CLKDIV_CPU0_COREM0_SHIFT) |
476 (clkdiv_cpu0_4212[i][2] << EXYNOS4_CLKDIV_CPU0_COREM1_SHIFT) |
477 (clkdiv_cpu0_4212[i][3] << EXYNOS4_CLKDIV_CPU0_PERIPH_SHIFT) |
478 (clkdiv_cpu0_4212[i][4] << EXYNOS4_CLKDIV_CPU0_ATB_SHIFT) |
479 (clkdiv_cpu0_4212[i][5] << EXYNOS4_CLKDIV_CPU0_PCLKDBG_SHIFT) |
480 (clkdiv_cpu0_4212[i][6] << EXYNOS4_CLKDIV_CPU0_APLL_SHIFT));
482 tmp &= ~EXYNOS4_CLKDIV_CPU0_CORE2_MASK;
484 tmp |= ((clkdiv_cpu0_4412[i][0] << EXYNOS4_CLKDIV_CPU0_CORE_SHIFT) |
485 (clkdiv_cpu0_4412[i][1] << EXYNOS4_CLKDIV_CPU0_COREM0_SHIFT) |
486 (clkdiv_cpu0_4412[i][2] << EXYNOS4_CLKDIV_CPU0_COREM1_SHIFT) |
487 (clkdiv_cpu0_4412[i][3] << EXYNOS4_CLKDIV_CPU0_PERIPH_SHIFT) |
488 (clkdiv_cpu0_4412[i][4] << EXYNOS4_CLKDIV_CPU0_ATB_SHIFT) |
489 (clkdiv_cpu0_4412[i][5] << EXYNOS4_CLKDIV_CPU0_PCLKDBG_SHIFT) |
490 (clkdiv_cpu0_4412[i][6] << EXYNOS4_CLKDIV_CPU0_APLL_SHIFT) |
491 (clkdiv_cpu0_4412[i][7] << EXYNOS4_CLKDIV_CPU0_CORE2_SHIFT));
494 exynos4x12_clkdiv_table[i].clkdiv = tmp;
496 tmp = __raw_readl(EXYNOS4_CLKDIV_CPU1);
498 if (soc_is_exynos4212()) {
499 tmp &= ~(EXYNOS4_CLKDIV_CPU1_COPY_MASK |
500 EXYNOS4_CLKDIV_CPU1_HPM_MASK);
501 tmp |= ((clkdiv_cpu1_4212[i][0] << EXYNOS4_CLKDIV_CPU1_COPY_SHIFT) |
502 (clkdiv_cpu1_4212[i][1] << EXYNOS4_CLKDIV_CPU1_HPM_SHIFT));
504 tmp &= ~(EXYNOS4_CLKDIV_CPU1_COPY_MASK |
505 EXYNOS4_CLKDIV_CPU1_HPM_MASK |
506 EXYNOS4_CLKDIV_CPU1_CORES_MASK);
507 tmp |= ((clkdiv_cpu1_4412[i][0] << EXYNOS4_CLKDIV_CPU1_COPY_SHIFT) |
508 (clkdiv_cpu1_4412[i][1] << EXYNOS4_CLKDIV_CPU1_HPM_SHIFT) |
509 (clkdiv_cpu1_4412[i][2] << EXYNOS4_CLKDIV_CPU1_CORES_SHIFT));
511 exynos4x12_clkdiv_table[i].clkdiv1 = tmp;
514 info->mpll_freq_khz = rate;
515 info->pm_lock_idx = L5;
516 info->pll_safe_idx = L7;
517 info->max_support_idx = max_support_idx;
518 info->min_support_idx = min_support_idx;
519 info->cpu_clk = cpu_clk;
520 info->volt_table = exynos4x12_volt_table;
521 info->freq_table = exynos4x12_freq_table;
522 info->set_freq = exynos4x12_set_frequency;
523 info->need_apll_change = exynos4x12_pms_change;
534 pr_debug("%s: failed initialization\n", __func__);
537 EXPORT_SYMBOL(exynos4x12_cpufreq_init);