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a35c5051 JL |
1 | /* |
2 | * Copyright (c) 2010-2012 Samsung Electronics Co., Ltd. | |
3 | * http://www.samsung.com | |
4 | * | |
5 | * EXYNOS4X12 - 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/regs-clock.h> | |
3c2a0909 | 21 | #include <mach/cpufreq.h> |
a35c5051 | 22 | |
a35c5051 JL |
23 | static struct clk *cpu_clk; |
24 | static struct clk *moutcore; | |
25 | static struct clk *mout_mpll; | |
26 | static struct clk *mout_apll; | |
27 | ||
9d0554ff JC |
28 | static unsigned int exynos4x12_volt_table[] = { |
29 | 1350000, 1287500, 1250000, 1187500, 1137500, 1087500, 1037500, | |
30 | 1000000, 987500, 975000, 950000, 925000, 900000, 900000 | |
a35c5051 JL |
31 | }; |
32 | ||
a35c5051 | 33 | static struct cpufreq_frequency_table exynos4x12_freq_table[] = { |
9d0554ff | 34 | {L0, CPUFREQ_ENTRY_INVALID}, |
a35c5051 JL |
35 | {L1, 1400 * 1000}, |
36 | {L2, 1300 * 1000}, | |
37 | {L3, 1200 * 1000}, | |
38 | {L4, 1100 * 1000}, | |
39 | {L5, 1000 * 1000}, | |
40 | {L6, 900 * 1000}, | |
41 | {L7, 800 * 1000}, | |
42 | {L8, 700 * 1000}, | |
43 | {L9, 600 * 1000}, | |
44 | {L10, 500 * 1000}, | |
45 | {L11, 400 * 1000}, | |
46 | {L12, 300 * 1000}, | |
47 | {L13, 200 * 1000}, | |
48 | {0, CPUFREQ_TABLE_END}, | |
49 | }; | |
50 | ||
9d0554ff | 51 | static struct apll_freq *apll_freq_4x12; |
a35c5051 | 52 | |
9d0554ff | 53 | static struct apll_freq apll_freq_4212[] = { |
a35c5051 | 54 | /* |
9d0554ff JC |
55 | * values: |
56 | * freq | |
57 | * clock divider for CORE, COREM0, COREM1, PERIPH, ATB, PCLK_DBG, APLL, CORE2 | |
58 | * clock divider for COPY, HPM, RESERVED | |
59 | * PLL M, P, S | |
a35c5051 | 60 | */ |
9d0554ff JC |
61 | APLL_FREQ(1500, 0, 3, 7, 0, 6, 1, 2, 0, 6, 2, 0, 250, 4, 0), |
62 | APLL_FREQ(1400, 0, 3, 7, 0, 6, 1, 2, 0, 6, 2, 0, 175, 3, 0), | |
63 | APLL_FREQ(1300, 0, 3, 7, 0, 5, 1, 2, 0, 5, 2, 0, 325, 6, 0), | |
64 | APLL_FREQ(1200, 0, 3, 7, 0, 5, 1, 2, 0, 5, 2, 0, 200, 4, 0), | |
65 | APLL_FREQ(1100, 0, 3, 6, 0, 4, 1, 2, 0, 4, 2, 0, 275, 6, 0), | |
66 | APLL_FREQ(1000, 0, 2, 5, 0, 4, 1, 1, 0, 4, 2, 0, 125, 3, 0), | |
67 | APLL_FREQ(900, 0, 2, 5, 0, 3, 1, 1, 0, 3, 2, 0, 150, 4, 0), | |
68 | APLL_FREQ(800, 0, 2, 5, 0, 3, 1, 1, 0, 3, 2, 0, 100, 3, 0), | |
69 | APLL_FREQ(700, 0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 175, 3, 1), | |
70 | APLL_FREQ(600, 0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 200, 4, 1), | |
71 | APLL_FREQ(500, 0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 125, 3, 1), | |
72 | APLL_FREQ(400, 0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 100, 3, 1), | |
73 | APLL_FREQ(300, 0, 2, 4, 0, 2, 1, 1, 0, 3, 2, 0, 200, 4, 2), | |
74 | APLL_FREQ(200, 0, 1, 3, 0, 1, 1, 1, 0, 3, 2, 0, 100, 3, 2), | |
a35c5051 JL |
75 | }; |
76 | ||
9d0554ff | 77 | static struct apll_freq apll_freq_4412[] = { |
a35c5051 | 78 | /* |
9d0554ff JC |
79 | * values: |
80 | * freq | |
81 | * clock divider for CORE, COREM0, COREM1, PERIPH, ATB, PCLK_DBG, APLL, CORE2 | |
82 | * clock divider for COPY, HPM, CORES | |
83 | * PLL M, P, S | |
a35c5051 | 84 | */ |
9d0554ff JC |
85 | APLL_FREQ(1500, 0, 3, 7, 0, 6, 1, 2, 0, 6, 0, 7, 250, 4, 0), |
86 | APLL_FREQ(1400, 0, 3, 7, 0, 6, 1, 2, 0, 6, 0, 6, 175, 3, 0), | |
87 | APLL_FREQ(1300, 0, 3, 7, 0, 5, 1, 2, 0, 5, 0, 6, 325, 6, 0), | |
88 | APLL_FREQ(1200, 0, 3, 7, 0, 5, 1, 2, 0, 5, 0, 5, 200, 4, 0), | |
89 | APLL_FREQ(1100, 0, 3, 6, 0, 4, 1, 2, 0, 4, 0, 5, 275, 6, 0), | |
90 | APLL_FREQ(1000, 0, 2, 5, 0, 4, 1, 1, 0, 4, 0, 4, 125, 3, 0), | |
91 | APLL_FREQ(900, 0, 2, 5, 0, 3, 1, 1, 0, 3, 0, 4, 150, 4, 0), | |
92 | APLL_FREQ(800, 0, 2, 5, 0, 3, 1, 1, 0, 3, 0, 3, 100, 3, 0), | |
93 | APLL_FREQ(700, 0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 3, 175, 3, 1), | |
94 | APLL_FREQ(600, 0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 2, 200, 4, 1), | |
95 | APLL_FREQ(500, 0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 2, 125, 3, 1), | |
96 | APLL_FREQ(400, 0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 1, 100, 3, 1), | |
97 | APLL_FREQ(300, 0, 2, 4, 0, 2, 1, 1, 0, 3, 0, 1, 200, 4, 2), | |
98 | APLL_FREQ(200, 0, 1, 3, 0, 1, 1, 1, 0, 3, 0, 0, 100, 3, 2), | |
a35c5051 JL |
99 | }; |
100 | ||
101 | static void exynos4x12_set_clkdiv(unsigned int div_index) | |
102 | { | |
103 | unsigned int tmp; | |
104 | unsigned int stat_cpu1; | |
105 | ||
106 | /* Change Divider - CPU0 */ | |
107 | ||
9d0554ff | 108 | tmp = apll_freq_4x12[div_index].clk_div_cpu0; |
a35c5051 JL |
109 | |
110 | __raw_writel(tmp, EXYNOS4_CLKDIV_CPU); | |
111 | ||
112 | while (__raw_readl(EXYNOS4_CLKDIV_STATCPU) & 0x11111111) | |
113 | cpu_relax(); | |
114 | ||
115 | /* Change Divider - CPU1 */ | |
9d0554ff | 116 | tmp = apll_freq_4x12[div_index].clk_div_cpu1; |
a35c5051 JL |
117 | |
118 | __raw_writel(tmp, EXYNOS4_CLKDIV_CPU1); | |
119 | if (soc_is_exynos4212()) | |
120 | stat_cpu1 = 0x11; | |
121 | else | |
122 | stat_cpu1 = 0x111; | |
123 | ||
124 | while (__raw_readl(EXYNOS4_CLKDIV_STATCPU1) & stat_cpu1) | |
125 | cpu_relax(); | |
126 | } | |
127 | ||
128 | static void exynos4x12_set_apll(unsigned int index) | |
129 | { | |
130 | unsigned int tmp, pdiv; | |
131 | ||
132 | /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */ | |
133 | clk_set_parent(moutcore, mout_mpll); | |
134 | ||
135 | do { | |
136 | cpu_relax(); | |
137 | tmp = (__raw_readl(EXYNOS4_CLKMUX_STATCPU) | |
138 | >> EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT); | |
139 | tmp &= 0x7; | |
140 | } while (tmp != 0x2); | |
141 | ||
142 | /* 2. Set APLL Lock time */ | |
9d0554ff | 143 | pdiv = ((apll_freq_4x12[index].mps >> 8) & 0x3f); |
a35c5051 JL |
144 | |
145 | __raw_writel((pdiv * 250), EXYNOS4_APLL_LOCK); | |
146 | ||
147 | /* 3. Change PLL PMS values */ | |
148 | tmp = __raw_readl(EXYNOS4_APLL_CON0); | |
149 | tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0)); | |
9d0554ff | 150 | tmp |= apll_freq_4x12[index].mps; |
a35c5051 JL |
151 | __raw_writel(tmp, EXYNOS4_APLL_CON0); |
152 | ||
153 | /* 4. wait_lock_time */ | |
154 | do { | |
155 | cpu_relax(); | |
156 | tmp = __raw_readl(EXYNOS4_APLL_CON0); | |
157 | } while (!(tmp & (0x1 << EXYNOS4_APLLCON0_LOCKED_SHIFT))); | |
158 | ||
159 | /* 5. MUX_CORE_SEL = APLL */ | |
160 | clk_set_parent(moutcore, mout_apll); | |
161 | ||
162 | do { | |
163 | cpu_relax(); | |
164 | tmp = __raw_readl(EXYNOS4_CLKMUX_STATCPU); | |
165 | tmp &= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK; | |
166 | } while (tmp != (0x1 << EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT)); | |
167 | } | |
168 | ||
94aa4409 | 169 | static bool exynos4x12_pms_change(unsigned int old_index, unsigned int new_index) |
a35c5051 | 170 | { |
9d0554ff JC |
171 | unsigned int old_pm = apll_freq_4x12[old_index].mps >> 8; |
172 | unsigned int new_pm = apll_freq_4x12[new_index].mps >> 8; | |
a35c5051 JL |
173 | |
174 | return (old_pm == new_pm) ? 0 : 1; | |
175 | } | |
176 | ||
177 | static void exynos4x12_set_frequency(unsigned int old_index, | |
178 | unsigned int new_index) | |
179 | { | |
180 | unsigned int tmp; | |
181 | ||
182 | if (old_index > new_index) { | |
183 | if (!exynos4x12_pms_change(old_index, new_index)) { | |
184 | /* 1. Change the system clock divider values */ | |
185 | exynos4x12_set_clkdiv(new_index); | |
186 | /* 2. Change just s value in apll m,p,s value */ | |
187 | tmp = __raw_readl(EXYNOS4_APLL_CON0); | |
188 | tmp &= ~(0x7 << 0); | |
9d0554ff | 189 | tmp |= apll_freq_4x12[new_index].mps & 0x7; |
a35c5051 JL |
190 | __raw_writel(tmp, EXYNOS4_APLL_CON0); |
191 | ||
192 | } else { | |
193 | /* Clock Configuration Procedure */ | |
194 | /* 1. Change the system clock divider values */ | |
195 | exynos4x12_set_clkdiv(new_index); | |
196 | /* 2. Change the apll m,p,s value */ | |
197 | exynos4x12_set_apll(new_index); | |
198 | } | |
199 | } else if (old_index < new_index) { | |
200 | if (!exynos4x12_pms_change(old_index, new_index)) { | |
201 | /* 1. Change just s value in apll m,p,s value */ | |
202 | tmp = __raw_readl(EXYNOS4_APLL_CON0); | |
203 | tmp &= ~(0x7 << 0); | |
9d0554ff | 204 | tmp |= apll_freq_4x12[new_index].mps & 0x7; |
a35c5051 JL |
205 | __raw_writel(tmp, EXYNOS4_APLL_CON0); |
206 | /* 2. Change the system clock divider values */ | |
207 | exynos4x12_set_clkdiv(new_index); | |
208 | } else { | |
209 | /* Clock Configuration Procedure */ | |
210 | /* 1. Change the apll m,p,s value */ | |
211 | exynos4x12_set_apll(new_index); | |
212 | /* 2. Change the system clock divider values */ | |
213 | exynos4x12_set_clkdiv(new_index); | |
214 | } | |
215 | } | |
216 | } | |
217 | ||
a35c5051 JL |
218 | int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info) |
219 | { | |
a35c5051 JL |
220 | unsigned long rate; |
221 | ||
a35c5051 JL |
222 | cpu_clk = clk_get(NULL, "armclk"); |
223 | if (IS_ERR(cpu_clk)) | |
224 | return PTR_ERR(cpu_clk); | |
225 | ||
226 | moutcore = clk_get(NULL, "moutcore"); | |
227 | if (IS_ERR(moutcore)) | |
228 | goto err_moutcore; | |
229 | ||
230 | mout_mpll = clk_get(NULL, "mout_mpll"); | |
231 | if (IS_ERR(mout_mpll)) | |
232 | goto err_mout_mpll; | |
233 | ||
234 | rate = clk_get_rate(mout_mpll) / 1000; | |
235 | ||
236 | mout_apll = clk_get(NULL, "mout_apll"); | |
237 | if (IS_ERR(mout_apll)) | |
238 | goto err_mout_apll; | |
239 | ||
9d0554ff JC |
240 | if (soc_is_exynos4212()) |
241 | apll_freq_4x12 = apll_freq_4212; | |
242 | else | |
243 | apll_freq_4x12 = apll_freq_4412; | |
a35c5051 JL |
244 | |
245 | info->mpll_freq_khz = rate; | |
9d0554ff | 246 | /* 800Mhz */ |
a35c5051 | 247 | info->pll_safe_idx = L7; |
a35c5051 JL |
248 | info->cpu_clk = cpu_clk; |
249 | info->volt_table = exynos4x12_volt_table; | |
250 | info->freq_table = exynos4x12_freq_table; | |
251 | info->set_freq = exynos4x12_set_frequency; | |
252 | info->need_apll_change = exynos4x12_pms_change; | |
253 | ||
254 | return 0; | |
255 | ||
256 | err_mout_apll: | |
257 | clk_put(mout_mpll); | |
258 | err_mout_mpll: | |
259 | clk_put(moutcore); | |
260 | err_moutcore: | |
261 | clk_put(cpu_clk); | |
262 | ||
263 | pr_debug("%s: failed initialization\n", __func__); | |
264 | return -EINVAL; | |
265 | } | |
266 | EXPORT_SYMBOL(exynos4x12_cpufreq_init); |