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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> | |
22 | #include <mach/cpufreq.h> | |
23 | ||
24 | #define CPUFREQ_LEVEL_END (L15 + 1) | |
25 | ||
26 | static int max_support_idx; | |
27 | static int min_support_idx = (CPUFREQ_LEVEL_END - 1); | |
28 | static struct clk *cpu_clk; | |
29 | static struct clk *moutcore; | |
30 | static struct clk *mout_mpll; | |
31 | static struct clk *mout_apll; | |
32 | ||
33 | struct cpufreq_clkdiv { | |
34 | unsigned int index; | |
35 | unsigned int clkdiv; | |
36 | unsigned int clkdiv1; | |
37 | }; | |
38 | ||
39 | static unsigned int exynos5250_volt_table[CPUFREQ_LEVEL_END]; | |
40 | ||
41 | static struct cpufreq_frequency_table exynos5250_freq_table[] = { | |
42 | {L0, 1700 * 1000}, | |
43 | {L1, 1600 * 1000}, | |
44 | {L2, 1500 * 1000}, | |
45 | {L3, 1400 * 1000}, | |
46 | {L4, 1300 * 1000}, | |
47 | {L5, 1200 * 1000}, | |
48 | {L6, 1100 * 1000}, | |
49 | {L7, 1000 * 1000}, | |
50 | {L8, 900 * 1000}, | |
51 | {L9, 800 * 1000}, | |
52 | {L10, 700 * 1000}, | |
53 | {L11, 600 * 1000}, | |
54 | {L12, 500 * 1000}, | |
55 | {L13, 400 * 1000}, | |
56 | {L14, 300 * 1000}, | |
57 | {L15, 200 * 1000}, | |
58 | {0, CPUFREQ_TABLE_END}, | |
59 | }; | |
60 | ||
61 | static struct cpufreq_clkdiv exynos5250_clkdiv_table[CPUFREQ_LEVEL_END]; | |
62 | ||
63 | static unsigned int clkdiv_cpu0_5250[CPUFREQ_LEVEL_END][8] = { | |
64 | /* | |
65 | * Clock divider value for following | |
66 | * { ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG, APLL, ARM2 } | |
67 | */ | |
68 | { 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1700 MHz - N/A */ | |
69 | { 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1600 MHz - N/A */ | |
70 | { 0, 3, 7, 7, 5, 1, 3, 0 }, /* 1500 MHz - N/A */ | |
71 | { 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1400 MHz */ | |
72 | { 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1300 MHz */ | |
73 | { 0, 3, 7, 7, 5, 1, 3, 0 }, /* 1200 MHz */ | |
74 | { 0, 2, 7, 7, 5, 1, 2, 0 }, /* 1100 MHz */ | |
75 | { 0, 2, 7, 7, 4, 1, 2, 0 }, /* 1000 MHz */ | |
76 | { 0, 2, 7, 7, 4, 1, 2, 0 }, /* 900 MHz */ | |
77 | { 0, 2, 7, 7, 3, 1, 1, 0 }, /* 800 MHz */ | |
78 | { 0, 1, 7, 7, 3, 1, 1, 0 }, /* 700 MHz */ | |
79 | { 0, 1, 7, 7, 2, 1, 1, 0 }, /* 600 MHz */ | |
80 | { 0, 1, 7, 7, 2, 1, 1, 0 }, /* 500 MHz */ | |
81 | { 0, 1, 7, 7, 1, 1, 1, 0 }, /* 400 MHz */ | |
82 | { 0, 1, 7, 7, 1, 1, 1, 0 }, /* 300 MHz */ | |
83 | { 0, 1, 7, 7, 1, 1, 1, 0 }, /* 200 MHz */ | |
84 | }; | |
85 | ||
86 | static unsigned int clkdiv_cpu1_5250[CPUFREQ_LEVEL_END][2] = { | |
87 | /* Clock divider value for following | |
88 | * { COPY, HPM } | |
89 | */ | |
90 | { 0, 2 }, /* 1700 MHz - N/A */ | |
91 | { 0, 2 }, /* 1600 MHz - N/A */ | |
92 | { 0, 2 }, /* 1500 MHz - N/A */ | |
93 | { 0, 2 }, /* 1400 MHz */ | |
94 | { 0, 2 }, /* 1300 MHz */ | |
95 | { 0, 2 }, /* 1200 MHz */ | |
96 | { 0, 2 }, /* 1100 MHz */ | |
97 | { 0, 2 }, /* 1000 MHz */ | |
98 | { 0, 2 }, /* 900 MHz */ | |
99 | { 0, 2 }, /* 800 MHz */ | |
100 | { 0, 2 }, /* 700 MHz */ | |
101 | { 0, 2 }, /* 600 MHz */ | |
102 | { 0, 2 }, /* 500 MHz */ | |
103 | { 0, 2 }, /* 400 MHz */ | |
104 | { 0, 2 }, /* 300 MHz */ | |
105 | { 0, 2 }, /* 200 MHz */ | |
106 | }; | |
107 | ||
108 | static unsigned int exynos5_apll_pms_table[CPUFREQ_LEVEL_END] = { | |
109 | (0), /* 1700 MHz - N/A */ | |
110 | (0), /* 1600 MHz - N/A */ | |
111 | (0), /* 1500 MHz - N/A */ | |
112 | (0), /* 1400 MHz */ | |
113 | ((325 << 16) | (6 << 8) | 0), /* 1300 MHz */ | |
114 | ((200 << 16) | (4 << 8) | 0), /* 1200 MHz */ | |
115 | ((275 << 16) | (6 << 8) | 0), /* 1100 MHz */ | |
116 | ((125 << 16) | (3 << 8) | 0), /* 1000 MHz */ | |
117 | ((150 << 16) | (4 << 8) | 0), /* 900 MHz */ | |
118 | ((100 << 16) | (3 << 8) | 0), /* 800 MHz */ | |
119 | ((175 << 16) | (3 << 8) | 1), /* 700 MHz */ | |
120 | ((200 << 16) | (4 << 8) | 1), /* 600 MHz */ | |
121 | ((125 << 16) | (3 << 8) | 1), /* 500 MHz */ | |
122 | ((100 << 16) | (3 << 8) | 1), /* 400 MHz */ | |
123 | ((200 << 16) | (4 << 8) | 2), /* 300 MHz */ | |
124 | ((100 << 16) | (3 << 8) | 2), /* 200 MHz */ | |
125 | }; | |
126 | ||
127 | /* ASV group voltage table */ | |
128 | static const unsigned int asv_voltage_5250[CPUFREQ_LEVEL_END] = { | |
129 | 0, 0, 0, 0, 0, 0, 0, /* 1700 MHz ~ 1100 MHz Not supported */ | |
130 | 1175000, 1125000, 1075000, 1050000, 1000000, | |
131 | 950000, 925000, 925000, 900000 | |
132 | }; | |
133 | ||
134 | static void set_clkdiv(unsigned int div_index) | |
135 | { | |
136 | unsigned int tmp; | |
137 | ||
138 | /* Change Divider - CPU0 */ | |
139 | ||
140 | tmp = exynos5250_clkdiv_table[div_index].clkdiv; | |
141 | ||
142 | __raw_writel(tmp, EXYNOS5_CLKDIV_CPU0); | |
143 | ||
144 | while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111) | |
145 | cpu_relax(); | |
146 | ||
147 | /* Change Divider - CPU1 */ | |
148 | tmp = exynos5250_clkdiv_table[div_index].clkdiv1; | |
149 | ||
150 | __raw_writel(tmp, EXYNOS5_CLKDIV_CPU1); | |
151 | ||
152 | while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1) & 0x11) | |
153 | cpu_relax(); | |
154 | } | |
155 | ||
156 | static void set_apll(unsigned int new_index, | |
157 | unsigned int old_index) | |
158 | { | |
159 | unsigned int tmp, pdiv; | |
160 | ||
161 | /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */ | |
162 | clk_set_parent(moutcore, mout_mpll); | |
163 | ||
164 | do { | |
165 | cpu_relax(); | |
166 | tmp = (__raw_readl(EXYNOS5_CLKMUX_STATCPU) >> 16); | |
167 | tmp &= 0x7; | |
168 | } while (tmp != 0x2); | |
169 | ||
170 | /* 2. Set APLL Lock time */ | |
171 | pdiv = ((exynos5_apll_pms_table[new_index] >> 8) & 0x3f); | |
172 | ||
173 | __raw_writel((pdiv * 250), EXYNOS5_APLL_LOCK); | |
174 | ||
175 | /* 3. Change PLL PMS values */ | |
176 | tmp = __raw_readl(EXYNOS5_APLL_CON0); | |
177 | tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0)); | |
178 | tmp |= exynos5_apll_pms_table[new_index]; | |
179 | __raw_writel(tmp, EXYNOS5_APLL_CON0); | |
180 | ||
181 | /* 4. wait_lock_time */ | |
182 | do { | |
183 | cpu_relax(); | |
184 | tmp = __raw_readl(EXYNOS5_APLL_CON0); | |
185 | } while (!(tmp & (0x1 << 29))); | |
186 | ||
187 | /* 5. MUX_CORE_SEL = APLL */ | |
188 | clk_set_parent(moutcore, mout_apll); | |
189 | ||
190 | do { | |
191 | cpu_relax(); | |
192 | tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU); | |
193 | tmp &= (0x7 << 16); | |
194 | } while (tmp != (0x1 << 16)); | |
195 | ||
196 | } | |
197 | ||
198 | bool exynos5250_pms_change(unsigned int old_index, unsigned int new_index) | |
199 | { | |
200 | unsigned int old_pm = (exynos5_apll_pms_table[old_index] >> 8); | |
201 | unsigned int new_pm = (exynos5_apll_pms_table[new_index] >> 8); | |
202 | ||
203 | return (old_pm == new_pm) ? 0 : 1; | |
204 | } | |
205 | ||
206 | static void exynos5250_set_frequency(unsigned int old_index, | |
207 | unsigned int new_index) | |
208 | { | |
209 | unsigned int tmp; | |
210 | ||
211 | if (old_index > new_index) { | |
212 | if (!exynos5250_pms_change(old_index, new_index)) { | |
213 | /* 1. Change the system clock divider values */ | |
214 | set_clkdiv(new_index); | |
215 | /* 2. Change just s value in apll m,p,s value */ | |
216 | tmp = __raw_readl(EXYNOS5_APLL_CON0); | |
217 | tmp &= ~(0x7 << 0); | |
218 | tmp |= (exynos5_apll_pms_table[new_index] & 0x7); | |
219 | __raw_writel(tmp, EXYNOS5_APLL_CON0); | |
220 | ||
221 | } else { | |
222 | /* Clock Configuration Procedure */ | |
223 | /* 1. Change the system clock divider values */ | |
224 | set_clkdiv(new_index); | |
225 | /* 2. Change the apll m,p,s value */ | |
226 | set_apll(new_index, old_index); | |
227 | } | |
228 | } else if (old_index < new_index) { | |
229 | if (!exynos5250_pms_change(old_index, new_index)) { | |
230 | /* 1. Change just s value in apll m,p,s value */ | |
231 | tmp = __raw_readl(EXYNOS5_APLL_CON0); | |
232 | tmp &= ~(0x7 << 0); | |
233 | tmp |= (exynos5_apll_pms_table[new_index] & 0x7); | |
234 | __raw_writel(tmp, EXYNOS5_APLL_CON0); | |
235 | /* 2. Change the system clock divider values */ | |
236 | set_clkdiv(new_index); | |
237 | } else { | |
238 | /* Clock Configuration Procedure */ | |
239 | /* 1. Change the apll m,p,s value */ | |
240 | set_apll(new_index, old_index); | |
241 | /* 2. Change the system clock divider values */ | |
242 | set_clkdiv(new_index); | |
243 | } | |
244 | } | |
245 | } | |
246 | ||
247 | static void __init set_volt_table(void) | |
248 | { | |
249 | unsigned int i; | |
250 | ||
251 | exynos5250_freq_table[L0].frequency = CPUFREQ_ENTRY_INVALID; | |
252 | exynos5250_freq_table[L1].frequency = CPUFREQ_ENTRY_INVALID; | |
253 | exynos5250_freq_table[L2].frequency = CPUFREQ_ENTRY_INVALID; | |
254 | exynos5250_freq_table[L3].frequency = CPUFREQ_ENTRY_INVALID; | |
255 | exynos5250_freq_table[L4].frequency = CPUFREQ_ENTRY_INVALID; | |
256 | exynos5250_freq_table[L5].frequency = CPUFREQ_ENTRY_INVALID; | |
257 | exynos5250_freq_table[L6].frequency = CPUFREQ_ENTRY_INVALID; | |
258 | ||
259 | max_support_idx = L7; | |
260 | ||
261 | for (i = 0 ; i < CPUFREQ_LEVEL_END ; i++) | |
262 | exynos5250_volt_table[i] = asv_voltage_5250[i]; | |
263 | } | |
264 | ||
265 | int exynos5250_cpufreq_init(struct exynos_dvfs_info *info) | |
266 | { | |
267 | int i; | |
268 | unsigned int tmp; | |
269 | unsigned long rate; | |
270 | ||
271 | set_volt_table(); | |
272 | ||
273 | cpu_clk = clk_get(NULL, "armclk"); | |
274 | if (IS_ERR(cpu_clk)) | |
275 | return PTR_ERR(cpu_clk); | |
276 | ||
277 | moutcore = clk_get(NULL, "mout_cpu"); | |
278 | if (IS_ERR(moutcore)) | |
279 | goto err_moutcore; | |
280 | ||
281 | mout_mpll = clk_get(NULL, "mout_mpll"); | |
282 | if (IS_ERR(mout_mpll)) | |
283 | goto err_mout_mpll; | |
284 | ||
285 | rate = clk_get_rate(mout_mpll) / 1000; | |
286 | ||
287 | mout_apll = clk_get(NULL, "mout_apll"); | |
288 | if (IS_ERR(mout_apll)) | |
289 | goto err_mout_apll; | |
290 | ||
291 | for (i = L0; i < CPUFREQ_LEVEL_END; i++) { | |
292 | ||
293 | exynos5250_clkdiv_table[i].index = i; | |
294 | ||
295 | tmp = __raw_readl(EXYNOS5_CLKDIV_CPU0); | |
296 | ||
297 | tmp &= ~((0x7 << 0) | (0x7 << 4) | (0x7 << 8) | | |
298 | (0x7 << 12) | (0x7 << 16) | (0x7 << 20) | | |
299 | (0x7 << 24) | (0x7 << 28)); | |
300 | ||
301 | tmp |= ((clkdiv_cpu0_5250[i][0] << 0) | | |
302 | (clkdiv_cpu0_5250[i][1] << 4) | | |
303 | (clkdiv_cpu0_5250[i][2] << 8) | | |
304 | (clkdiv_cpu0_5250[i][3] << 12) | | |
305 | (clkdiv_cpu0_5250[i][4] << 16) | | |
306 | (clkdiv_cpu0_5250[i][5] << 20) | | |
307 | (clkdiv_cpu0_5250[i][6] << 24) | | |
308 | (clkdiv_cpu0_5250[i][7] << 28)); | |
309 | ||
310 | exynos5250_clkdiv_table[i].clkdiv = tmp; | |
311 | ||
312 | tmp = __raw_readl(EXYNOS5_CLKDIV_CPU1); | |
313 | ||
314 | tmp &= ~((0x7 << 0) | (0x7 << 4)); | |
315 | ||
316 | tmp |= ((clkdiv_cpu1_5250[i][0] << 0) | | |
317 | (clkdiv_cpu1_5250[i][1] << 4)); | |
318 | ||
319 | exynos5250_clkdiv_table[i].clkdiv1 = tmp; | |
320 | } | |
321 | ||
322 | info->mpll_freq_khz = rate; | |
323 | /* 1000Mhz */ | |
324 | info->pm_lock_idx = L7; | |
325 | /* 800Mhz */ | |
326 | info->pll_safe_idx = L9; | |
327 | info->max_support_idx = max_support_idx; | |
328 | info->min_support_idx = min_support_idx; | |
329 | info->cpu_clk = cpu_clk; | |
330 | info->volt_table = exynos5250_volt_table; | |
331 | info->freq_table = exynos5250_freq_table; | |
332 | info->set_freq = exynos5250_set_frequency; | |
333 | info->need_apll_change = exynos5250_pms_change; | |
334 | ||
335 | return 0; | |
336 | ||
337 | err_mout_apll: | |
338 | clk_put(mout_mpll); | |
339 | err_mout_mpll: | |
340 | clk_put(moutcore); | |
341 | err_moutcore: | |
342 | clk_put(cpu_clk); | |
343 | ||
344 | pr_err("%s: failed initialization\n", __func__); | |
345 | return -EINVAL; | |
346 | } | |
347 | EXPORT_SYMBOL(exynos5250_cpufreq_init); |