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 static struct clk *cpu_clk;
25 static struct clk *moutcore;
26 static struct clk *mout_mpll;
27 static struct clk *mout_apll;
29 static unsigned int exynos5250_volt_table[] = {
30 1300000, 1250000, 1225000, 1200000, 1150000,
31 1125000, 1100000, 1075000, 1050000, 1025000,
32 1012500, 1000000, 975000, 950000, 937500,
36 static struct cpufreq_frequency_table exynos5250_freq_table[] = {
53 {0, CPUFREQ_TABLE_END},
56 static struct apll_freq apll_freq_5250[] = {
60 * clock divider for ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG, APLL, ARM2
61 * clock divider for COPY, HPM, RESERVED
64 APLL_FREQ(1700, 0, 3, 7, 7, 7, 3, 5, 0, 0, 2, 0, 425, 6, 0),
65 APLL_FREQ(1600, 0, 3, 7, 7, 7, 1, 4, 0, 0, 2, 0, 200, 3, 0),
66 APLL_FREQ(1500, 0, 2, 7, 7, 7, 1, 4, 0, 0, 2, 0, 250, 4, 0),
67 APLL_FREQ(1400, 0, 2, 7, 7, 6, 1, 4, 0, 0, 2, 0, 175, 3, 0),
68 APLL_FREQ(1300, 0, 2, 7, 7, 6, 1, 3, 0, 0, 2, 0, 325, 6, 0),
69 APLL_FREQ(1200, 0, 2, 7, 7, 5, 1, 3, 0, 0, 2, 0, 200, 4, 0),
70 APLL_FREQ(1100, 0, 3, 7, 7, 5, 1, 3, 0, 0, 2, 0, 275, 6, 0),
71 APLL_FREQ(1000, 0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 125, 3, 0),
72 APLL_FREQ(900, 0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 150, 4, 0),
73 APLL_FREQ(800, 0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 100, 3, 0),
74 APLL_FREQ(700, 0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 175, 3, 1),
75 APLL_FREQ(600, 0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 200, 4, 1),
76 APLL_FREQ(500, 0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 125, 3, 1),
77 APLL_FREQ(400, 0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 100, 3, 1),
78 APLL_FREQ(300, 0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 200, 4, 2),
79 APLL_FREQ(200, 0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 100, 3, 2),
82 static void set_clkdiv(unsigned int div_index)
86 /* Change Divider - CPU0 */
88 tmp = apll_freq_5250[div_index].clk_div_cpu0;
90 __raw_writel(tmp, EXYNOS5_CLKDIV_CPU0);
92 while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111)
95 /* Change Divider - CPU1 */
96 tmp = apll_freq_5250[div_index].clk_div_cpu1;
98 __raw_writel(tmp, EXYNOS5_CLKDIV_CPU1);
100 while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1) & 0x11)
104 static void set_apll(unsigned int new_index,
105 unsigned int old_index)
107 unsigned int tmp, pdiv;
109 /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
110 clk_set_parent(moutcore, mout_mpll);
114 tmp = (__raw_readl(EXYNOS5_CLKMUX_STATCPU) >> 16);
116 } while (tmp != 0x2);
118 /* 2. Set APLL Lock time */
119 pdiv = ((apll_freq_5250[new_index].mps >> 8) & 0x3f);
121 __raw_writel((pdiv * 250), EXYNOS5_APLL_LOCK);
123 /* 3. Change PLL PMS values */
124 tmp = __raw_readl(EXYNOS5_APLL_CON0);
125 tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0));
126 tmp |= apll_freq_5250[new_index].mps;
127 __raw_writel(tmp, EXYNOS5_APLL_CON0);
129 /* 4. wait_lock_time */
132 tmp = __raw_readl(EXYNOS5_APLL_CON0);
133 } while (!(tmp & (0x1 << 29)));
135 /* 5. MUX_CORE_SEL = APLL */
136 clk_set_parent(moutcore, mout_apll);
140 tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU);
142 } while (tmp != (0x1 << 16));
146 static bool exynos5250_pms_change(unsigned int old_index, unsigned int new_index)
148 unsigned int old_pm = apll_freq_5250[old_index].mps >> 8;
149 unsigned int new_pm = apll_freq_5250[new_index].mps >> 8;
151 return (old_pm == new_pm) ? 0 : 1;
154 static void exynos5250_set_frequency(unsigned int old_index,
155 unsigned int new_index)
159 if (old_index > new_index) {
160 if (!exynos5250_pms_change(old_index, new_index)) {
161 /* 1. Change the system clock divider values */
162 set_clkdiv(new_index);
163 /* 2. Change just s value in apll m,p,s value */
164 tmp = __raw_readl(EXYNOS5_APLL_CON0);
166 tmp |= apll_freq_5250[new_index].mps & 0x7;
167 __raw_writel(tmp, EXYNOS5_APLL_CON0);
170 /* Clock Configuration Procedure */
171 /* 1. Change the system clock divider values */
172 set_clkdiv(new_index);
173 /* 2. Change the apll m,p,s value */
174 set_apll(new_index, old_index);
176 } else if (old_index < new_index) {
177 if (!exynos5250_pms_change(old_index, new_index)) {
178 /* 1. Change just s value in apll m,p,s value */
179 tmp = __raw_readl(EXYNOS5_APLL_CON0);
181 tmp |= apll_freq_5250[new_index].mps & 0x7;
182 __raw_writel(tmp, EXYNOS5_APLL_CON0);
183 /* 2. Change the system clock divider values */
184 set_clkdiv(new_index);
186 /* Clock Configuration Procedure */
187 /* 1. Change the apll m,p,s value */
188 set_apll(new_index, old_index);
189 /* 2. Change the system clock divider values */
190 set_clkdiv(new_index);
195 int exynos5250_cpufreq_init(struct exynos_dvfs_info *info)
199 cpu_clk = clk_get(NULL, "armclk");
201 return PTR_ERR(cpu_clk);
203 moutcore = clk_get(NULL, "mout_cpu");
204 if (IS_ERR(moutcore))
207 mout_mpll = clk_get(NULL, "mout_mpll");
208 if (IS_ERR(mout_mpll))
211 rate = clk_get_rate(mout_mpll) / 1000;
213 mout_apll = clk_get(NULL, "mout_apll");
214 if (IS_ERR(mout_apll))
217 info->mpll_freq_khz = rate;
219 info->pll_safe_idx = L9;
220 info->cpu_clk = cpu_clk;
221 info->volt_table = exynos5250_volt_table;
222 info->freq_table = exynos5250_freq_table;
223 info->set_freq = exynos5250_set_frequency;
224 info->need_apll_change = exynos5250_pms_change;
235 pr_err("%s: failed initialization\n", __func__);
238 EXPORT_SYMBOL(exynos5250_cpufreq_init);