2 * Copyright (c) 2010-20122Samsung Electronics Co., Ltd.
3 * http://www.samsung.com
5 * EXYNOS5250 - 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>
21 #include <mach/regs-clock.h>
22 #include <mach/cpufreq.h>
24 #define CPUFREQ_LEVEL_END (L15 + 1)
26 static struct clk *cpu_clk;
27 static struct clk *moutcore;
28 static struct clk *mout_mpll;
29 static struct clk *mout_apll;
31 struct cpufreq_clkdiv {
37 static unsigned int exynos5250_volt_table[CPUFREQ_LEVEL_END];
39 static struct cpufreq_frequency_table exynos5250_freq_table[] = {
56 {0, CPUFREQ_TABLE_END},
59 static struct cpufreq_clkdiv exynos5250_clkdiv_table[CPUFREQ_LEVEL_END];
61 static unsigned int clkdiv_cpu0_5250[CPUFREQ_LEVEL_END][8] = {
63 * Clock divider value for following
64 * { ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG, APLL, ARM2 }
66 { 0, 3, 7, 7, 7, 3, 5, 0 }, /* 1700 MHz */
67 { 0, 3, 7, 7, 7, 1, 4, 0 }, /* 1600 MHz */
68 { 0, 2, 7, 7, 7, 1, 4, 0 }, /* 1500 MHz */
69 { 0, 2, 7, 7, 6, 1, 4, 0 }, /* 1400 MHz */
70 { 0, 2, 7, 7, 6, 1, 3, 0 }, /* 1300 MHz */
71 { 0, 2, 7, 7, 5, 1, 3, 0 }, /* 1200 MHz */
72 { 0, 3, 7, 7, 5, 1, 3, 0 }, /* 1100 MHz */
73 { 0, 1, 7, 7, 4, 1, 2, 0 }, /* 1000 MHz */
74 { 0, 1, 7, 7, 4, 1, 2, 0 }, /* 900 MHz */
75 { 0, 1, 7, 7, 4, 1, 2, 0 }, /* 800 MHz */
76 { 0, 1, 7, 7, 3, 1, 1, 0 }, /* 700 MHz */
77 { 0, 1, 7, 7, 3, 1, 1, 0 }, /* 600 MHz */
78 { 0, 1, 7, 7, 2, 1, 1, 0 }, /* 500 MHz */
79 { 0, 1, 7, 7, 2, 1, 1, 0 }, /* 400 MHz */
80 { 0, 1, 7, 7, 1, 1, 1, 0 }, /* 300 MHz */
81 { 0, 1, 7, 7, 1, 1, 1, 0 }, /* 200 MHz */
84 static unsigned int clkdiv_cpu1_5250[CPUFREQ_LEVEL_END][2] = {
85 /* Clock divider value for following
88 { 0, 2 }, /* 1700 MHz */
89 { 0, 2 }, /* 1600 MHz */
90 { 0, 2 }, /* 1500 MHz */
91 { 0, 2 }, /* 1400 MHz */
92 { 0, 2 }, /* 1300 MHz */
93 { 0, 2 }, /* 1200 MHz */
94 { 0, 2 }, /* 1100 MHz */
95 { 0, 2 }, /* 1000 MHz */
96 { 0, 2 }, /* 900 MHz */
97 { 0, 2 }, /* 800 MHz */
98 { 0, 2 }, /* 700 MHz */
99 { 0, 2 }, /* 600 MHz */
100 { 0, 2 }, /* 500 MHz */
101 { 0, 2 }, /* 400 MHz */
102 { 0, 2 }, /* 300 MHz */
103 { 0, 2 }, /* 200 MHz */
106 static unsigned int exynos5_apll_pms_table[CPUFREQ_LEVEL_END] = {
107 ((425 << 16) | (6 << 8) | 0), /* 1700 MHz */
108 ((200 << 16) | (3 << 8) | 0), /* 1600 MHz */
109 ((250 << 16) | (4 << 8) | 0), /* 1500 MHz */
110 ((175 << 16) | (3 << 8) | 0), /* 1400 MHz */
111 ((325 << 16) | (6 << 8) | 0), /* 1300 MHz */
112 ((200 << 16) | (4 << 8) | 0), /* 1200 MHz */
113 ((275 << 16) | (6 << 8) | 0), /* 1100 MHz */
114 ((125 << 16) | (3 << 8) | 0), /* 1000 MHz */
115 ((150 << 16) | (4 << 8) | 0), /* 900 MHz */
116 ((100 << 16) | (3 << 8) | 0), /* 800 MHz */
117 ((175 << 16) | (3 << 8) | 1), /* 700 MHz */
118 ((200 << 16) | (4 << 8) | 1), /* 600 MHz */
119 ((125 << 16) | (3 << 8) | 1), /* 500 MHz */
120 ((100 << 16) | (3 << 8) | 1), /* 400 MHz */
121 ((200 << 16) | (4 << 8) | 2), /* 300 MHz */
122 ((100 << 16) | (3 << 8) | 2), /* 200 MHz */
125 /* ASV group voltage table */
126 static const unsigned int asv_voltage_5250[CPUFREQ_LEVEL_END] = {
127 1300000, 1250000, 1225000, 1200000, 1150000,
128 1125000, 1100000, 1075000, 1050000, 1025000,
129 1012500, 1000000, 975000, 950000, 937500,
133 static void set_clkdiv(unsigned int div_index)
137 /* Change Divider - CPU0 */
139 tmp = exynos5250_clkdiv_table[div_index].clkdiv;
141 __raw_writel(tmp, EXYNOS5_CLKDIV_CPU0);
143 while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111)
146 /* Change Divider - CPU1 */
147 tmp = exynos5250_clkdiv_table[div_index].clkdiv1;
149 __raw_writel(tmp, EXYNOS5_CLKDIV_CPU1);
151 while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1) & 0x11)
155 static void set_apll(unsigned int new_index,
156 unsigned int old_index)
158 unsigned int tmp, pdiv;
160 /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
161 clk_set_parent(moutcore, mout_mpll);
165 tmp = (__raw_readl(EXYNOS5_CLKMUX_STATCPU) >> 16);
167 } while (tmp != 0x2);
169 /* 2. Set APLL Lock time */
170 pdiv = ((exynos5_apll_pms_table[new_index] >> 8) & 0x3f);
172 __raw_writel((pdiv * 250), EXYNOS5_APLL_LOCK);
174 /* 3. Change PLL PMS values */
175 tmp = __raw_readl(EXYNOS5_APLL_CON0);
176 tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0));
177 tmp |= exynos5_apll_pms_table[new_index];
178 __raw_writel(tmp, EXYNOS5_APLL_CON0);
180 /* 4. wait_lock_time */
183 tmp = __raw_readl(EXYNOS5_APLL_CON0);
184 } while (!(tmp & (0x1 << 29)));
186 /* 5. MUX_CORE_SEL = APLL */
187 clk_set_parent(moutcore, mout_apll);
191 tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU);
193 } while (tmp != (0x1 << 16));
197 bool exynos5250_pms_change(unsigned int old_index, unsigned int new_index)
199 unsigned int old_pm = (exynos5_apll_pms_table[old_index] >> 8);
200 unsigned int new_pm = (exynos5_apll_pms_table[new_index] >> 8);
202 return (old_pm == new_pm) ? 0 : 1;
205 static void exynos5250_set_frequency(unsigned int old_index,
206 unsigned int new_index)
210 if (old_index > new_index) {
211 if (!exynos5250_pms_change(old_index, new_index)) {
212 /* 1. Change the system clock divider values */
213 set_clkdiv(new_index);
214 /* 2. Change just s value in apll m,p,s value */
215 tmp = __raw_readl(EXYNOS5_APLL_CON0);
217 tmp |= (exynos5_apll_pms_table[new_index] & 0x7);
218 __raw_writel(tmp, EXYNOS5_APLL_CON0);
221 /* Clock Configuration Procedure */
222 /* 1. Change the system clock divider values */
223 set_clkdiv(new_index);
224 /* 2. Change the apll m,p,s value */
225 set_apll(new_index, old_index);
227 } else if (old_index < new_index) {
228 if (!exynos5250_pms_change(old_index, new_index)) {
229 /* 1. Change just s value in apll m,p,s value */
230 tmp = __raw_readl(EXYNOS5_APLL_CON0);
232 tmp |= (exynos5_apll_pms_table[new_index] & 0x7);
233 __raw_writel(tmp, EXYNOS5_APLL_CON0);
234 /* 2. Change the system clock divider values */
235 set_clkdiv(new_index);
237 /* Clock Configuration Procedure */
238 /* 1. Change the apll m,p,s value */
239 set_apll(new_index, old_index);
240 /* 2. Change the system clock divider values */
241 set_clkdiv(new_index);
246 static void __init set_volt_table(void)
250 for (i = 0 ; i < CPUFREQ_LEVEL_END ; i++)
251 exynos5250_volt_table[i] = asv_voltage_5250[i];
254 int exynos5250_cpufreq_init(struct exynos_dvfs_info *info)
262 cpu_clk = clk_get(NULL, "armclk");
264 return PTR_ERR(cpu_clk);
266 moutcore = clk_get(NULL, "mout_cpu");
267 if (IS_ERR(moutcore))
270 mout_mpll = clk_get(NULL, "mout_mpll");
271 if (IS_ERR(mout_mpll))
274 rate = clk_get_rate(mout_mpll) / 1000;
276 mout_apll = clk_get(NULL, "mout_apll");
277 if (IS_ERR(mout_apll))
280 for (i = L0; i < CPUFREQ_LEVEL_END; i++) {
282 exynos5250_clkdiv_table[i].index = i;
284 tmp = __raw_readl(EXYNOS5_CLKDIV_CPU0);
286 tmp &= ~((0x7 << 0) | (0x7 << 4) | (0x7 << 8) |
287 (0x7 << 12) | (0x7 << 16) | (0x7 << 20) |
288 (0x7 << 24) | (0x7 << 28));
290 tmp |= ((clkdiv_cpu0_5250[i][0] << 0) |
291 (clkdiv_cpu0_5250[i][1] << 4) |
292 (clkdiv_cpu0_5250[i][2] << 8) |
293 (clkdiv_cpu0_5250[i][3] << 12) |
294 (clkdiv_cpu0_5250[i][4] << 16) |
295 (clkdiv_cpu0_5250[i][5] << 20) |
296 (clkdiv_cpu0_5250[i][6] << 24) |
297 (clkdiv_cpu0_5250[i][7] << 28));
299 exynos5250_clkdiv_table[i].clkdiv = tmp;
301 tmp = __raw_readl(EXYNOS5_CLKDIV_CPU1);
303 tmp &= ~((0x7 << 0) | (0x7 << 4));
305 tmp |= ((clkdiv_cpu1_5250[i][0] << 0) |
306 (clkdiv_cpu1_5250[i][1] << 4));
308 exynos5250_clkdiv_table[i].clkdiv1 = tmp;
311 info->mpll_freq_khz = rate;
313 info->pll_safe_idx = L9;
314 info->cpu_clk = cpu_clk;
315 info->volt_table = exynos5250_volt_table;
316 info->freq_table = exynos5250_freq_table;
317 info->set_freq = exynos5250_set_frequency;
318 info->need_apll_change = exynos5250_pms_change;
329 pr_err("%s: failed initialization\n", __func__);
332 EXPORT_SYMBOL(exynos5250_cpufreq_init);