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f7d77079 | 1 | /* |
83efc743 JL |
2 | * Copyright (c) 2010 Samsung Electronics Co., Ltd. |
3 | * http://www.samsung.com | |
4 | * | |
5 | * CPU frequency scaling for S5PC110/S5PV210 | |
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/types.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/clk.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/cpufreq.h> | |
fe7f1bcb | 19 | #include <linux/reboot.h> |
e8b4c198 | 20 | #include <linux/regulator/consumer.h> |
405e6d6d | 21 | #include <linux/suspend.h> |
83efc743 JL |
22 | |
23 | #include <mach/map.h> | |
24 | #include <mach/regs-clock.h> | |
25 | ||
26 | static struct clk *cpu_clk; | |
27 | static struct clk *dmc0_clk; | |
28 | static struct clk *dmc1_clk; | |
29 | static struct cpufreq_freqs freqs; | |
5b02b779 | 30 | static DEFINE_MUTEX(set_freq_lock); |
83efc743 JL |
31 | |
32 | /* APLL M,P,S values for 1G/800Mhz */ | |
33 | #define APLL_VAL_1000 ((1 << 31) | (125 << 16) | (3 << 8) | 1) | |
34 | #define APLL_VAL_800 ((1 << 31) | (100 << 16) | (3 << 8) | 1) | |
35 | ||
405e6d6d HK |
36 | /* Use 800MHz when entering sleep mode */ |
37 | #define SLEEP_FREQ (800 * 1000) | |
38 | ||
90d5d0a1 HK |
39 | /* |
40 | * relation has an additional symantics other than the standard of cpufreq | |
41 | * DISALBE_FURTHER_CPUFREQ: disable further access to target | |
42 | * ENABLE_FURTUER_CPUFREQ: enable access to target | |
43 | */ | |
44 | enum cpufreq_access { | |
45 | DISABLE_FURTHER_CPUFREQ = 0x10, | |
46 | ENABLE_FURTHER_CPUFREQ = 0x20, | |
47 | }; | |
48 | ||
49 | static bool no_cpufreq_access; | |
50 | ||
83efc743 JL |
51 | /* |
52 | * DRAM configurations to calculate refresh counter for changing | |
53 | * frequency of memory. | |
54 | */ | |
55 | struct dram_conf { | |
56 | unsigned long freq; /* HZ */ | |
57 | unsigned long refresh; /* DRAM refresh counter * 1000 */ | |
58 | }; | |
59 | ||
60 | /* DRAM configuration (DMC0 and DMC1) */ | |
61 | static struct dram_conf s5pv210_dram_conf[2]; | |
62 | ||
63 | enum perf_level { | |
64 | L0, L1, L2, L3, L4, | |
65 | }; | |
66 | ||
67 | enum s5pv210_mem_type { | |
68 | LPDDR = 0x1, | |
69 | LPDDR2 = 0x2, | |
70 | DDR2 = 0x4, | |
71 | }; | |
72 | ||
73 | enum s5pv210_dmc_port { | |
74 | DMC0 = 0, | |
75 | DMC1, | |
76 | }; | |
77 | ||
78 | static struct cpufreq_frequency_table s5pv210_freq_table[] = { | |
79 | {L0, 1000*1000}, | |
80 | {L1, 800*1000}, | |
81 | {L2, 400*1000}, | |
82 | {L3, 200*1000}, | |
83 | {L4, 100*1000}, | |
84 | {0, CPUFREQ_TABLE_END}, | |
85 | }; | |
86 | ||
e8b4c198 JC |
87 | static struct regulator *arm_regulator; |
88 | static struct regulator *int_regulator; | |
89 | ||
90 | struct s5pv210_dvs_conf { | |
91 | int arm_volt; /* uV */ | |
92 | int int_volt; /* uV */ | |
93 | }; | |
94 | ||
95 | static const int arm_volt_max = 1350000; | |
96 | static const int int_volt_max = 1250000; | |
97 | ||
98 | static struct s5pv210_dvs_conf dvs_conf[] = { | |
99 | [L0] = { | |
100 | .arm_volt = 1250000, | |
101 | .int_volt = 1100000, | |
102 | }, | |
103 | [L1] = { | |
104 | .arm_volt = 1200000, | |
105 | .int_volt = 1100000, | |
106 | }, | |
107 | [L2] = { | |
108 | .arm_volt = 1050000, | |
109 | .int_volt = 1100000, | |
110 | }, | |
111 | [L3] = { | |
112 | .arm_volt = 950000, | |
113 | .int_volt = 1100000, | |
114 | }, | |
115 | [L4] = { | |
116 | .arm_volt = 950000, | |
117 | .int_volt = 1000000, | |
118 | }, | |
119 | }; | |
120 | ||
83efc743 JL |
121 | static u32 clkdiv_val[5][11] = { |
122 | /* | |
123 | * Clock divider value for following | |
124 | * { APLL, A2M, HCLK_MSYS, PCLK_MSYS, | |
125 | * HCLK_DSYS, PCLK_DSYS, HCLK_PSYS, PCLK_PSYS, | |
126 | * ONEDRAM, MFC, G3D } | |
127 | */ | |
128 | ||
129 | /* L0 : [1000/200/100][166/83][133/66][200/200] */ | |
130 | {0, 4, 4, 1, 3, 1, 4, 1, 3, 0, 0}, | |
131 | ||
132 | /* L1 : [800/200/100][166/83][133/66][200/200] */ | |
133 | {0, 3, 3, 1, 3, 1, 4, 1, 3, 0, 0}, | |
134 | ||
135 | /* L2 : [400/200/100][166/83][133/66][200/200] */ | |
136 | {1, 3, 1, 1, 3, 1, 4, 1, 3, 0, 0}, | |
137 | ||
138 | /* L3 : [200/200/100][166/83][133/66][200/200] */ | |
139 | {3, 3, 1, 1, 3, 1, 4, 1, 3, 0, 0}, | |
140 | ||
141 | /* L4 : [100/100/100][83/83][66/66][100/100] */ | |
142 | {7, 7, 0, 0, 7, 0, 9, 0, 7, 0, 0}, | |
143 | }; | |
144 | ||
145 | /* | |
146 | * This function set DRAM refresh counter | |
147 | * accoriding to operating frequency of DRAM | |
148 | * ch: DMC port number 0 or 1 | |
149 | * freq: Operating frequency of DRAM(KHz) | |
150 | */ | |
151 | static void s5pv210_set_refresh(enum s5pv210_dmc_port ch, unsigned long freq) | |
152 | { | |
153 | unsigned long tmp, tmp1; | |
154 | void __iomem *reg = NULL; | |
155 | ||
d62fa311 | 156 | if (ch == DMC0) { |
83efc743 | 157 | reg = (S5P_VA_DMC0 + 0x30); |
d62fa311 | 158 | } else if (ch == DMC1) { |
83efc743 | 159 | reg = (S5P_VA_DMC1 + 0x30); |
d62fa311 | 160 | } else { |
83efc743 | 161 | printk(KERN_ERR "Cannot find DMC port\n"); |
d62fa311 JC |
162 | return; |
163 | } | |
83efc743 JL |
164 | |
165 | /* Find current DRAM frequency */ | |
166 | tmp = s5pv210_dram_conf[ch].freq; | |
167 | ||
168 | do_div(tmp, freq); | |
169 | ||
170 | tmp1 = s5pv210_dram_conf[ch].refresh; | |
171 | ||
172 | do_div(tmp1, tmp); | |
173 | ||
174 | __raw_writel(tmp1, reg); | |
175 | } | |
176 | ||
133de121 | 177 | static unsigned int s5pv210_getspeed(unsigned int cpu) |
83efc743 JL |
178 | { |
179 | if (cpu) | |
180 | return 0; | |
181 | ||
182 | return clk_get_rate(cpu_clk) / 1000; | |
183 | } | |
184 | ||
185 | static int s5pv210_target(struct cpufreq_policy *policy, | |
186 | unsigned int target_freq, | |
187 | unsigned int relation) | |
188 | { | |
189 | unsigned long reg; | |
190 | unsigned int index, priv_index; | |
191 | unsigned int pll_changing = 0; | |
192 | unsigned int bus_speed_changing = 0; | |
e8b4c198 JC |
193 | int arm_volt, int_volt; |
194 | int ret = 0; | |
83efc743 | 195 | |
5b02b779 AH |
196 | mutex_lock(&set_freq_lock); |
197 | ||
90d5d0a1 HK |
198 | if (relation & ENABLE_FURTHER_CPUFREQ) |
199 | no_cpufreq_access = false; | |
200 | ||
201 | if (no_cpufreq_access) { | |
202 | #ifdef CONFIG_PM_VERBOSE | |
203 | pr_err("%s:%d denied access to %s as it is disabled" | |
204 | "temporarily\n", __FILE__, __LINE__, __func__); | |
205 | #endif | |
5b02b779 AH |
206 | ret = -EINVAL; |
207 | goto exit; | |
90d5d0a1 HK |
208 | } |
209 | ||
210 | if (relation & DISABLE_FURTHER_CPUFREQ) | |
211 | no_cpufreq_access = true; | |
212 | ||
213 | relation &= ~(ENABLE_FURTHER_CPUFREQ | DISABLE_FURTHER_CPUFREQ); | |
214 | ||
83efc743 JL |
215 | freqs.old = s5pv210_getspeed(0); |
216 | ||
217 | if (cpufreq_frequency_table_target(policy, s5pv210_freq_table, | |
5b02b779 AH |
218 | target_freq, relation, &index)) { |
219 | ret = -EINVAL; | |
220 | goto exit; | |
221 | } | |
83efc743 JL |
222 | |
223 | freqs.new = s5pv210_freq_table[index].frequency; | |
83efc743 JL |
224 | |
225 | if (freqs.new == freqs.old) | |
5b02b779 | 226 | goto exit; |
83efc743 JL |
227 | |
228 | /* Finding current running level index */ | |
229 | if (cpufreq_frequency_table_target(policy, s5pv210_freq_table, | |
5b02b779 AH |
230 | freqs.old, relation, &priv_index)) { |
231 | ret = -EINVAL; | |
232 | goto exit; | |
233 | } | |
83efc743 | 234 | |
e8b4c198 JC |
235 | arm_volt = dvs_conf[index].arm_volt; |
236 | int_volt = dvs_conf[index].int_volt; | |
83efc743 JL |
237 | |
238 | if (freqs.new > freqs.old) { | |
e8b4c198 JC |
239 | ret = regulator_set_voltage(arm_regulator, |
240 | arm_volt, arm_volt_max); | |
241 | if (ret) | |
5b02b779 | 242 | goto exit; |
e8b4c198 JC |
243 | |
244 | ret = regulator_set_voltage(int_regulator, | |
245 | int_volt, int_volt_max); | |
246 | if (ret) | |
5b02b779 | 247 | goto exit; |
83efc743 JL |
248 | } |
249 | ||
b43a7ffb | 250 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); |
e8b4c198 | 251 | |
83efc743 JL |
252 | /* Check if there need to change PLL */ |
253 | if ((index == L0) || (priv_index == L0)) | |
254 | pll_changing = 1; | |
255 | ||
256 | /* Check if there need to change System bus clock */ | |
257 | if ((index == L4) || (priv_index == L4)) | |
258 | bus_speed_changing = 1; | |
259 | ||
260 | if (bus_speed_changing) { | |
261 | /* | |
262 | * Reconfigure DRAM refresh counter value for minimum | |
263 | * temporary clock while changing divider. | |
264 | * expected clock is 83Mhz : 7.8usec/(1/83Mhz) = 0x287 | |
265 | */ | |
266 | if (pll_changing) | |
267 | s5pv210_set_refresh(DMC1, 83000); | |
268 | else | |
269 | s5pv210_set_refresh(DMC1, 100000); | |
270 | ||
271 | s5pv210_set_refresh(DMC0, 83000); | |
272 | } | |
273 | ||
274 | /* | |
275 | * APLL should be changed in this level | |
276 | * APLL -> MPLL(for stable transition) -> APLL | |
277 | * Some clock source's clock API are not prepared. | |
278 | * Do not use clock API in below code. | |
279 | */ | |
280 | if (pll_changing) { | |
281 | /* | |
282 | * 1. Temporary Change divider for MFC and G3D | |
283 | * SCLKA2M(200/1=200)->(200/4=50)Mhz | |
284 | */ | |
285 | reg = __raw_readl(S5P_CLK_DIV2); | |
286 | reg &= ~(S5P_CLKDIV2_G3D_MASK | S5P_CLKDIV2_MFC_MASK); | |
287 | reg |= (3 << S5P_CLKDIV2_G3D_SHIFT) | | |
288 | (3 << S5P_CLKDIV2_MFC_SHIFT); | |
289 | __raw_writel(reg, S5P_CLK_DIV2); | |
290 | ||
291 | /* For MFC, G3D dividing */ | |
292 | do { | |
293 | reg = __raw_readl(S5P_CLKDIV_STAT0); | |
294 | } while (reg & ((1 << 16) | (1 << 17))); | |
295 | ||
296 | /* | |
297 | * 2. Change SCLKA2M(200Mhz)to SCLKMPLL in MFC_MUX, G3D MUX | |
298 | * (200/4=50)->(667/4=166)Mhz | |
299 | */ | |
300 | reg = __raw_readl(S5P_CLK_SRC2); | |
301 | reg &= ~(S5P_CLKSRC2_G3D_MASK | S5P_CLKSRC2_MFC_MASK); | |
302 | reg |= (1 << S5P_CLKSRC2_G3D_SHIFT) | | |
303 | (1 << S5P_CLKSRC2_MFC_SHIFT); | |
304 | __raw_writel(reg, S5P_CLK_SRC2); | |
305 | ||
306 | do { | |
307 | reg = __raw_readl(S5P_CLKMUX_STAT1); | |
308 | } while (reg & ((1 << 7) | (1 << 3))); | |
309 | ||
310 | /* | |
311 | * 3. DMC1 refresh count for 133Mhz if (index == L4) is | |
312 | * true refresh counter is already programed in upper | |
313 | * code. 0x287@83Mhz | |
314 | */ | |
315 | if (!bus_speed_changing) | |
316 | s5pv210_set_refresh(DMC1, 133000); | |
317 | ||
318 | /* 4. SCLKAPLL -> SCLKMPLL */ | |
319 | reg = __raw_readl(S5P_CLK_SRC0); | |
320 | reg &= ~(S5P_CLKSRC0_MUX200_MASK); | |
321 | reg |= (0x1 << S5P_CLKSRC0_MUX200_SHIFT); | |
322 | __raw_writel(reg, S5P_CLK_SRC0); | |
323 | ||
324 | do { | |
325 | reg = __raw_readl(S5P_CLKMUX_STAT0); | |
326 | } while (reg & (0x1 << 18)); | |
327 | ||
328 | } | |
329 | ||
330 | /* Change divider */ | |
331 | reg = __raw_readl(S5P_CLK_DIV0); | |
332 | ||
333 | reg &= ~(S5P_CLKDIV0_APLL_MASK | S5P_CLKDIV0_A2M_MASK | | |
334 | S5P_CLKDIV0_HCLK200_MASK | S5P_CLKDIV0_PCLK100_MASK | | |
335 | S5P_CLKDIV0_HCLK166_MASK | S5P_CLKDIV0_PCLK83_MASK | | |
336 | S5P_CLKDIV0_HCLK133_MASK | S5P_CLKDIV0_PCLK66_MASK); | |
337 | ||
338 | reg |= ((clkdiv_val[index][0] << S5P_CLKDIV0_APLL_SHIFT) | | |
339 | (clkdiv_val[index][1] << S5P_CLKDIV0_A2M_SHIFT) | | |
340 | (clkdiv_val[index][2] << S5P_CLKDIV0_HCLK200_SHIFT) | | |
341 | (clkdiv_val[index][3] << S5P_CLKDIV0_PCLK100_SHIFT) | | |
342 | (clkdiv_val[index][4] << S5P_CLKDIV0_HCLK166_SHIFT) | | |
343 | (clkdiv_val[index][5] << S5P_CLKDIV0_PCLK83_SHIFT) | | |
344 | (clkdiv_val[index][6] << S5P_CLKDIV0_HCLK133_SHIFT) | | |
345 | (clkdiv_val[index][7] << S5P_CLKDIV0_PCLK66_SHIFT)); | |
346 | ||
347 | __raw_writel(reg, S5P_CLK_DIV0); | |
348 | ||
349 | do { | |
350 | reg = __raw_readl(S5P_CLKDIV_STAT0); | |
351 | } while (reg & 0xff); | |
352 | ||
353 | /* ARM MCS value changed */ | |
354 | reg = __raw_readl(S5P_ARM_MCS_CON); | |
355 | reg &= ~0x3; | |
356 | if (index >= L3) | |
357 | reg |= 0x3; | |
358 | else | |
359 | reg |= 0x1; | |
360 | ||
361 | __raw_writel(reg, S5P_ARM_MCS_CON); | |
362 | ||
363 | if (pll_changing) { | |
364 | /* 5. Set Lock time = 30us*24Mhz = 0x2cf */ | |
365 | __raw_writel(0x2cf, S5P_APLL_LOCK); | |
366 | ||
367 | /* | |
368 | * 6. Turn on APLL | |
369 | * 6-1. Set PMS values | |
370 | * 6-2. Wait untile the PLL is locked | |
371 | */ | |
372 | if (index == L0) | |
373 | __raw_writel(APLL_VAL_1000, S5P_APLL_CON); | |
374 | else | |
375 | __raw_writel(APLL_VAL_800, S5P_APLL_CON); | |
376 | ||
377 | do { | |
378 | reg = __raw_readl(S5P_APLL_CON); | |
379 | } while (!(reg & (0x1 << 29))); | |
380 | ||
381 | /* | |
382 | * 7. Change souce clock from SCLKMPLL(667Mhz) | |
383 | * to SCLKA2M(200Mhz) in MFC_MUX and G3D MUX | |
384 | * (667/4=166)->(200/4=50)Mhz | |
385 | */ | |
386 | reg = __raw_readl(S5P_CLK_SRC2); | |
387 | reg &= ~(S5P_CLKSRC2_G3D_MASK | S5P_CLKSRC2_MFC_MASK); | |
388 | reg |= (0 << S5P_CLKSRC2_G3D_SHIFT) | | |
389 | (0 << S5P_CLKSRC2_MFC_SHIFT); | |
390 | __raw_writel(reg, S5P_CLK_SRC2); | |
391 | ||
392 | do { | |
393 | reg = __raw_readl(S5P_CLKMUX_STAT1); | |
394 | } while (reg & ((1 << 7) | (1 << 3))); | |
395 | ||
396 | /* | |
397 | * 8. Change divider for MFC and G3D | |
398 | * (200/4=50)->(200/1=200)Mhz | |
399 | */ | |
400 | reg = __raw_readl(S5P_CLK_DIV2); | |
401 | reg &= ~(S5P_CLKDIV2_G3D_MASK | S5P_CLKDIV2_MFC_MASK); | |
402 | reg |= (clkdiv_val[index][10] << S5P_CLKDIV2_G3D_SHIFT) | | |
403 | (clkdiv_val[index][9] << S5P_CLKDIV2_MFC_SHIFT); | |
404 | __raw_writel(reg, S5P_CLK_DIV2); | |
405 | ||
406 | /* For MFC, G3D dividing */ | |
407 | do { | |
408 | reg = __raw_readl(S5P_CLKDIV_STAT0); | |
409 | } while (reg & ((1 << 16) | (1 << 17))); | |
410 | ||
411 | /* 9. Change MPLL to APLL in MSYS_MUX */ | |
412 | reg = __raw_readl(S5P_CLK_SRC0); | |
413 | reg &= ~(S5P_CLKSRC0_MUX200_MASK); | |
414 | reg |= (0x0 << S5P_CLKSRC0_MUX200_SHIFT); | |
415 | __raw_writel(reg, S5P_CLK_SRC0); | |
416 | ||
417 | do { | |
418 | reg = __raw_readl(S5P_CLKMUX_STAT0); | |
419 | } while (reg & (0x1 << 18)); | |
420 | ||
421 | /* | |
422 | * 10. DMC1 refresh counter | |
423 | * L4 : DMC1 = 100Mhz 7.8us/(1/100) = 0x30c | |
424 | * Others : DMC1 = 200Mhz 7.8us/(1/200) = 0x618 | |
425 | */ | |
426 | if (!bus_speed_changing) | |
427 | s5pv210_set_refresh(DMC1, 200000); | |
428 | } | |
429 | ||
430 | /* | |
431 | * L4 level need to change memory bus speed, hence onedram clock divier | |
432 | * and memory refresh parameter should be changed | |
433 | */ | |
434 | if (bus_speed_changing) { | |
435 | reg = __raw_readl(S5P_CLK_DIV6); | |
436 | reg &= ~S5P_CLKDIV6_ONEDRAM_MASK; | |
437 | reg |= (clkdiv_val[index][8] << S5P_CLKDIV6_ONEDRAM_SHIFT); | |
438 | __raw_writel(reg, S5P_CLK_DIV6); | |
439 | ||
440 | do { | |
441 | reg = __raw_readl(S5P_CLKDIV_STAT1); | |
442 | } while (reg & (1 << 15)); | |
443 | ||
444 | /* Reconfigure DRAM refresh counter value */ | |
445 | if (index != L4) { | |
446 | /* | |
447 | * DMC0 : 166Mhz | |
448 | * DMC1 : 200Mhz | |
449 | */ | |
450 | s5pv210_set_refresh(DMC0, 166000); | |
451 | s5pv210_set_refresh(DMC1, 200000); | |
452 | } else { | |
453 | /* | |
454 | * DMC0 : 83Mhz | |
455 | * DMC1 : 100Mhz | |
456 | */ | |
457 | s5pv210_set_refresh(DMC0, 83000); | |
458 | s5pv210_set_refresh(DMC1, 100000); | |
459 | } | |
460 | } | |
461 | ||
b43a7ffb | 462 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); |
74df8e69 | 463 | |
83efc743 | 464 | if (freqs.new < freqs.old) { |
e8b4c198 JC |
465 | regulator_set_voltage(int_regulator, |
466 | int_volt, int_volt_max); | |
467 | ||
468 | regulator_set_voltage(arm_regulator, | |
469 | arm_volt, arm_volt_max); | |
83efc743 JL |
470 | } |
471 | ||
83efc743 JL |
472 | printk(KERN_DEBUG "Perf changed[L%d]\n", index); |
473 | ||
5b02b779 AH |
474 | exit: |
475 | mutex_unlock(&set_freq_lock); | |
476 | return ret; | |
83efc743 JL |
477 | } |
478 | ||
479 | #ifdef CONFIG_PM | |
7ca64e2d | 480 | static int s5pv210_cpufreq_suspend(struct cpufreq_policy *policy) |
83efc743 JL |
481 | { |
482 | return 0; | |
483 | } | |
484 | ||
485 | static int s5pv210_cpufreq_resume(struct cpufreq_policy *policy) | |
486 | { | |
487 | return 0; | |
488 | } | |
489 | #endif | |
490 | ||
491 | static int check_mem_type(void __iomem *dmc_reg) | |
492 | { | |
493 | unsigned long val; | |
494 | ||
495 | val = __raw_readl(dmc_reg + 0x4); | |
496 | val = (val & (0xf << 8)); | |
497 | ||
498 | return val >> 8; | |
499 | } | |
500 | ||
501 | static int __init s5pv210_cpu_init(struct cpufreq_policy *policy) | |
502 | { | |
503 | unsigned long mem_type; | |
4911ca10 | 504 | int ret; |
83efc743 JL |
505 | |
506 | cpu_clk = clk_get(NULL, "armclk"); | |
507 | if (IS_ERR(cpu_clk)) | |
508 | return PTR_ERR(cpu_clk); | |
509 | ||
510 | dmc0_clk = clk_get(NULL, "sclk_dmc0"); | |
511 | if (IS_ERR(dmc0_clk)) { | |
4911ca10 JL |
512 | ret = PTR_ERR(dmc0_clk); |
513 | goto out_dmc0; | |
83efc743 JL |
514 | } |
515 | ||
516 | dmc1_clk = clk_get(NULL, "hclk_msys"); | |
517 | if (IS_ERR(dmc1_clk)) { | |
4911ca10 JL |
518 | ret = PTR_ERR(dmc1_clk); |
519 | goto out_dmc1; | |
83efc743 JL |
520 | } |
521 | ||
4911ca10 JL |
522 | if (policy->cpu != 0) { |
523 | ret = -EINVAL; | |
524 | goto out_dmc1; | |
525 | } | |
83efc743 JL |
526 | |
527 | /* | |
528 | * check_mem_type : This driver only support LPDDR & LPDDR2. | |
529 | * other memory type is not supported. | |
530 | */ | |
531 | mem_type = check_mem_type(S5P_VA_DMC0); | |
532 | ||
533 | if ((mem_type != LPDDR) && (mem_type != LPDDR2)) { | |
534 | printk(KERN_ERR "CPUFreq doesn't support this memory type\n"); | |
4911ca10 JL |
535 | ret = -EINVAL; |
536 | goto out_dmc1; | |
83efc743 JL |
537 | } |
538 | ||
539 | /* Find current refresh counter and frequency each DMC */ | |
540 | s5pv210_dram_conf[0].refresh = (__raw_readl(S5P_VA_DMC0 + 0x30) * 1000); | |
541 | s5pv210_dram_conf[0].freq = clk_get_rate(dmc0_clk); | |
542 | ||
543 | s5pv210_dram_conf[1].refresh = (__raw_readl(S5P_VA_DMC1 + 0x30) * 1000); | |
544 | s5pv210_dram_conf[1].freq = clk_get_rate(dmc1_clk); | |
545 | ||
c3d7d87d | 546 | return cpufreq_generic_init(policy, s5pv210_freq_table, 40000); |
4911ca10 JL |
547 | |
548 | out_dmc1: | |
549 | clk_put(dmc0_clk); | |
550 | out_dmc0: | |
551 | clk_put(cpu_clk); | |
552 | return ret; | |
83efc743 JL |
553 | } |
554 | ||
405e6d6d HK |
555 | static int s5pv210_cpufreq_notifier_event(struct notifier_block *this, |
556 | unsigned long event, void *ptr) | |
557 | { | |
558 | int ret; | |
559 | ||
560 | switch (event) { | |
561 | case PM_SUSPEND_PREPARE: | |
562 | ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ, | |
563 | DISABLE_FURTHER_CPUFREQ); | |
564 | if (ret < 0) | |
565 | return NOTIFY_BAD; | |
566 | ||
567 | return NOTIFY_OK; | |
568 | case PM_POST_RESTORE: | |
569 | case PM_POST_SUSPEND: | |
570 | cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ, | |
571 | ENABLE_FURTHER_CPUFREQ); | |
572 | ||
573 | return NOTIFY_OK; | |
574 | } | |
575 | ||
576 | return NOTIFY_DONE; | |
577 | } | |
578 | ||
fe7f1bcb HK |
579 | static int s5pv210_cpufreq_reboot_notifier_event(struct notifier_block *this, |
580 | unsigned long event, void *ptr) | |
581 | { | |
582 | int ret; | |
583 | ||
584 | ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ, | |
585 | DISABLE_FURTHER_CPUFREQ); | |
586 | if (ret < 0) | |
587 | return NOTIFY_BAD; | |
588 | ||
589 | return NOTIFY_DONE; | |
590 | } | |
591 | ||
83efc743 JL |
592 | static struct cpufreq_driver s5pv210_driver = { |
593 | .flags = CPUFREQ_STICKY, | |
9c3c6e33 | 594 | .verify = cpufreq_generic_frequency_table_verify, |
83efc743 JL |
595 | .target = s5pv210_target, |
596 | .get = s5pv210_getspeed, | |
597 | .init = s5pv210_cpu_init, | |
598 | .name = "s5pv210", | |
599 | #ifdef CONFIG_PM | |
600 | .suspend = s5pv210_cpufreq_suspend, | |
601 | .resume = s5pv210_cpufreq_resume, | |
602 | #endif | |
603 | }; | |
604 | ||
405e6d6d HK |
605 | static struct notifier_block s5pv210_cpufreq_notifier = { |
606 | .notifier_call = s5pv210_cpufreq_notifier_event, | |
607 | }; | |
608 | ||
fe7f1bcb HK |
609 | static struct notifier_block s5pv210_cpufreq_reboot_notifier = { |
610 | .notifier_call = s5pv210_cpufreq_reboot_notifier_event, | |
611 | }; | |
612 | ||
83efc743 JL |
613 | static int __init s5pv210_cpufreq_init(void) |
614 | { | |
e8b4c198 JC |
615 | arm_regulator = regulator_get(NULL, "vddarm"); |
616 | if (IS_ERR(arm_regulator)) { | |
617 | pr_err("failed to get regulator vddarm"); | |
618 | return PTR_ERR(arm_regulator); | |
619 | } | |
620 | ||
621 | int_regulator = regulator_get(NULL, "vddint"); | |
622 | if (IS_ERR(int_regulator)) { | |
623 | pr_err("failed to get regulator vddint"); | |
624 | regulator_put(arm_regulator); | |
625 | return PTR_ERR(int_regulator); | |
626 | } | |
627 | ||
405e6d6d | 628 | register_pm_notifier(&s5pv210_cpufreq_notifier); |
fe7f1bcb | 629 | register_reboot_notifier(&s5pv210_cpufreq_reboot_notifier); |
405e6d6d | 630 | |
83efc743 JL |
631 | return cpufreq_register_driver(&s5pv210_driver); |
632 | } | |
633 | ||
634 | late_initcall(s5pv210_cpufreq_init); |