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562a6cbe JL |
1 | /* |
2 | * Copyright (c) 2010-20122Samsung Electronics Co., Ltd. | |
3 | * http://www.samsung.com | |
4 | * | |
5 | * EXYNOS5250 - CPU frequency scaling support | |
6 | * | |
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. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/clk.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/cpufreq.h> | |
19 | ||
20 | #include <mach/map.h> | |
21 | #include <mach/regs-clock.h> | |
3c2a0909 | 22 | #include <mach/cpufreq.h> |
562a6cbe | 23 | |
562a6cbe JL |
24 | static struct clk *cpu_clk; |
25 | static struct clk *moutcore; | |
26 | static struct clk *mout_mpll; | |
27 | static struct clk *mout_apll; | |
28 | ||
9d0554ff JC |
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, | |
33 | 925000 | |
562a6cbe JL |
34 | }; |
35 | ||
562a6cbe JL |
36 | static struct cpufreq_frequency_table exynos5250_freq_table[] = { |
37 | {L0, 1700 * 1000}, | |
38 | {L1, 1600 * 1000}, | |
39 | {L2, 1500 * 1000}, | |
40 | {L3, 1400 * 1000}, | |
41 | {L4, 1300 * 1000}, | |
42 | {L5, 1200 * 1000}, | |
43 | {L6, 1100 * 1000}, | |
44 | {L7, 1000 * 1000}, | |
9d0554ff JC |
45 | {L8, 900 * 1000}, |
46 | {L9, 800 * 1000}, | |
562a6cbe JL |
47 | {L10, 700 * 1000}, |
48 | {L11, 600 * 1000}, | |
49 | {L12, 500 * 1000}, | |
50 | {L13, 400 * 1000}, | |
51 | {L14, 300 * 1000}, | |
52 | {L15, 200 * 1000}, | |
53 | {0, CPUFREQ_TABLE_END}, | |
54 | }; | |
55 | ||
9d0554ff | 56 | static struct apll_freq apll_freq_5250[] = { |
562a6cbe | 57 | /* |
9d0554ff JC |
58 | * values: |
59 | * freq | |
60 | * clock divider for ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG, APLL, ARM2 | |
61 | * clock divider for COPY, HPM, RESERVED | |
62 | * PLL M, P, S | |
562a6cbe | 63 | */ |
9d0554ff JC |
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), | |
562a6cbe JL |
80 | }; |
81 | ||
82 | static void set_clkdiv(unsigned int div_index) | |
83 | { | |
84 | unsigned int tmp; | |
85 | ||
86 | /* Change Divider - CPU0 */ | |
87 | ||
9d0554ff | 88 | tmp = apll_freq_5250[div_index].clk_div_cpu0; |
562a6cbe JL |
89 | |
90 | __raw_writel(tmp, EXYNOS5_CLKDIV_CPU0); | |
91 | ||
92 | while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111) | |
93 | cpu_relax(); | |
94 | ||
95 | /* Change Divider - CPU1 */ | |
9d0554ff | 96 | tmp = apll_freq_5250[div_index].clk_div_cpu1; |
562a6cbe JL |
97 | |
98 | __raw_writel(tmp, EXYNOS5_CLKDIV_CPU1); | |
99 | ||
100 | while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1) & 0x11) | |
101 | cpu_relax(); | |
102 | } | |
103 | ||
104 | static void set_apll(unsigned int new_index, | |
105 | unsigned int old_index) | |
106 | { | |
107 | unsigned int tmp, pdiv; | |
108 | ||
109 | /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */ | |
110 | clk_set_parent(moutcore, mout_mpll); | |
111 | ||
112 | do { | |
113 | cpu_relax(); | |
114 | tmp = (__raw_readl(EXYNOS5_CLKMUX_STATCPU) >> 16); | |
115 | tmp &= 0x7; | |
116 | } while (tmp != 0x2); | |
117 | ||
118 | /* 2. Set APLL Lock time */ | |
9d0554ff | 119 | pdiv = ((apll_freq_5250[new_index].mps >> 8) & 0x3f); |
562a6cbe JL |
120 | |
121 | __raw_writel((pdiv * 250), EXYNOS5_APLL_LOCK); | |
122 | ||
123 | /* 3. Change PLL PMS values */ | |
124 | tmp = __raw_readl(EXYNOS5_APLL_CON0); | |
125 | tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0)); | |
9d0554ff | 126 | tmp |= apll_freq_5250[new_index].mps; |
562a6cbe JL |
127 | __raw_writel(tmp, EXYNOS5_APLL_CON0); |
128 | ||
129 | /* 4. wait_lock_time */ | |
130 | do { | |
131 | cpu_relax(); | |
132 | tmp = __raw_readl(EXYNOS5_APLL_CON0); | |
133 | } while (!(tmp & (0x1 << 29))); | |
134 | ||
135 | /* 5. MUX_CORE_SEL = APLL */ | |
136 | clk_set_parent(moutcore, mout_apll); | |
137 | ||
138 | do { | |
139 | cpu_relax(); | |
140 | tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU); | |
141 | tmp &= (0x7 << 16); | |
142 | } while (tmp != (0x1 << 16)); | |
143 | ||
144 | } | |
145 | ||
94aa4409 | 146 | static bool exynos5250_pms_change(unsigned int old_index, unsigned int new_index) |
562a6cbe | 147 | { |
9d0554ff JC |
148 | unsigned int old_pm = apll_freq_5250[old_index].mps >> 8; |
149 | unsigned int new_pm = apll_freq_5250[new_index].mps >> 8; | |
562a6cbe JL |
150 | |
151 | return (old_pm == new_pm) ? 0 : 1; | |
152 | } | |
153 | ||
154 | static void exynos5250_set_frequency(unsigned int old_index, | |
155 | unsigned int new_index) | |
156 | { | |
157 | unsigned int tmp; | |
158 | ||
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); | |
165 | tmp &= ~(0x7 << 0); | |
9d0554ff | 166 | tmp |= apll_freq_5250[new_index].mps & 0x7; |
562a6cbe JL |
167 | __raw_writel(tmp, EXYNOS5_APLL_CON0); |
168 | ||
169 | } else { | |
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); | |
175 | } | |
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); | |
180 | tmp &= ~(0x7 << 0); | |
9d0554ff | 181 | tmp |= apll_freq_5250[new_index].mps & 0x7; |
562a6cbe JL |
182 | __raw_writel(tmp, EXYNOS5_APLL_CON0); |
183 | /* 2. Change the system clock divider values */ | |
184 | set_clkdiv(new_index); | |
185 | } else { | |
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); | |
191 | } | |
192 | } | |
193 | } | |
194 | ||
562a6cbe JL |
195 | int exynos5250_cpufreq_init(struct exynos_dvfs_info *info) |
196 | { | |
562a6cbe JL |
197 | unsigned long rate; |
198 | ||
562a6cbe JL |
199 | cpu_clk = clk_get(NULL, "armclk"); |
200 | if (IS_ERR(cpu_clk)) | |
201 | return PTR_ERR(cpu_clk); | |
202 | ||
203 | moutcore = clk_get(NULL, "mout_cpu"); | |
204 | if (IS_ERR(moutcore)) | |
205 | goto err_moutcore; | |
206 | ||
207 | mout_mpll = clk_get(NULL, "mout_mpll"); | |
208 | if (IS_ERR(mout_mpll)) | |
209 | goto err_mout_mpll; | |
210 | ||
211 | rate = clk_get_rate(mout_mpll) / 1000; | |
212 | ||
213 | mout_apll = clk_get(NULL, "mout_apll"); | |
214 | if (IS_ERR(mout_apll)) | |
215 | goto err_mout_apll; | |
216 | ||
562a6cbe | 217 | info->mpll_freq_khz = rate; |
562a6cbe JL |
218 | /* 800Mhz */ |
219 | info->pll_safe_idx = L9; | |
562a6cbe JL |
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; | |
225 | ||
226 | return 0; | |
227 | ||
228 | err_mout_apll: | |
229 | clk_put(mout_mpll); | |
230 | err_mout_mpll: | |
231 | clk_put(moutcore); | |
232 | err_moutcore: | |
233 | clk_put(cpu_clk); | |
234 | ||
235 | pr_err("%s: failed initialization\n", __func__); | |
236 | return -EINVAL; | |
237 | } | |
238 | EXPORT_SYMBOL(exynos5250_cpufreq_init); |