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1/* drivers/devfreq/exynos4210_memorybus.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com/
5 * MyungJoo Ham <myungjoo.ham@samsung.com>
6 *
7 * EXYNOS4 - Memory/Bus clock frequency scaling support in DEVFREQ framework
8 * This version supports EXYNOS4210 only. This changes bus frequencies
9 * and vddint voltages. Exynos4412/4212 should be able to be supported
10 * with minor modifications.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17
18#include <linux/io.h>
19#include <linux/slab.h>
20#include <linux/mutex.h>
21#include <linux/suspend.h>
22#include <linux/opp.h>
23#include <linux/devfreq.h>
24#include <linux/platform_device.h>
25#include <linux/regulator/consumer.h>
26#include <linux/module.h>
27
28/* Exynos4 ASV has been in the mailing list, but not upstreamed, yet. */
29#ifdef CONFIG_EXYNOS_ASV
30extern unsigned int exynos_result_of_asv;
31#endif
32
33#include <mach/regs-clock.h>
34
35#include <plat/map-s5p.h>
36
37#define MAX_SAFEVOLT 1200000 /* 1.2V */
38
39enum exynos4_busf_type {
40 TYPE_BUSF_EXYNOS4210,
41 TYPE_BUSF_EXYNOS4x12,
42};
43
44/* Assume that the bus is saturated if the utilization is 40% */
45#define BUS_SATURATION_RATIO 40
46
47enum ppmu_counter {
48 PPMU_PMNCNT0 = 0,
49 PPMU_PMCCNT1,
50 PPMU_PMNCNT2,
51 PPMU_PMNCNT3,
52 PPMU_PMNCNT_MAX,
53};
54struct exynos4_ppmu {
55 void __iomem *hw_base;
56 unsigned int ccnt;
57 unsigned int event;
58 unsigned int count[PPMU_PMNCNT_MAX];
59 bool ccnt_overflow;
60 bool count_overflow[PPMU_PMNCNT_MAX];
61};
62
63enum busclk_level_idx {
64 LV_0 = 0,
65 LV_1,
66 LV_2,
67 LV_3,
68 LV_4,
69 _LV_END
70};
71#define EX4210_LV_MAX LV_2
72#define EX4x12_LV_MAX LV_4
73#define EX4210_LV_NUM (LV_2 + 1)
74#define EX4x12_LV_NUM (LV_4 + 1)
75
76struct busfreq_data {
77 enum exynos4_busf_type type;
78 struct device *dev;
79 struct devfreq *devfreq;
80 bool disabled;
81 struct regulator *vdd_int;
82 struct regulator *vdd_mif; /* Exynos4412/4212 only */
83 struct opp *curr_opp;
84 struct exynos4_ppmu dmc[2];
85
86 struct notifier_block pm_notifier;
87 struct mutex lock;
88
89 /* Dividers calculated at boot/probe-time */
90 unsigned int dmc_divtable[_LV_END]; /* DMC0 */
91 unsigned int top_divtable[_LV_END];
92};
93
94struct bus_opp_table {
95 unsigned int idx;
96 unsigned long clk;
97 unsigned long volt;
98};
99
100/* 4210 controls clock of mif and voltage of int */
101static struct bus_opp_table exynos4210_busclk_table[] = {
102 {LV_0, 400000, 1150000},
103 {LV_1, 267000, 1050000},
104 {LV_2, 133000, 1025000},
105 {0, 0, 0},
106};
107
108/*
109 * MIF is the main control knob clock for exynox4x12 MIF/INT
110 * clock and voltage of both mif/int are controlled.
111 */
112static struct bus_opp_table exynos4x12_mifclk_table[] = {
113 {LV_0, 400000, 1100000},
114 {LV_1, 267000, 1000000},
115 {LV_2, 160000, 950000},
116 {LV_3, 133000, 950000},
117 {LV_4, 100000, 950000},
118 {0, 0, 0},
119};
120
121/*
122 * INT is not the control knob of 4x12. LV_x is not meant to represent
123 * the current performance. (MIF does)
124 */
125static struct bus_opp_table exynos4x12_intclk_table[] = {
126 {LV_0, 200000, 1000000},
127 {LV_1, 160000, 950000},
128 {LV_2, 133000, 925000},
129 {LV_3, 100000, 900000},
130 {0, 0, 0},
131};
132
133/* TODO: asv volt definitions are "__initdata"? */
134/* Some chips have different operating voltages */
135static unsigned int exynos4210_asv_volt[][EX4210_LV_NUM] = {
136 {1150000, 1050000, 1050000},
137 {1125000, 1025000, 1025000},
138 {1100000, 1000000, 1000000},
139 {1075000, 975000, 975000},
140 {1050000, 950000, 950000},
141};
142
143static unsigned int exynos4x12_mif_step_50[][EX4x12_LV_NUM] = {
144 /* 400 267 160 133 100 */
145 {1050000, 950000, 900000, 900000, 900000}, /* ASV0 */
146 {1050000, 950000, 900000, 900000, 900000}, /* ASV1 */
147 {1050000, 950000, 900000, 900000, 900000}, /* ASV2 */
148 {1050000, 900000, 900000, 900000, 900000}, /* ASV3 */
149 {1050000, 900000, 900000, 900000, 850000}, /* ASV4 */
150 {1050000, 900000, 900000, 850000, 850000}, /* ASV5 */
151 {1050000, 900000, 850000, 850000, 850000}, /* ASV6 */
152 {1050000, 900000, 850000, 850000, 850000}, /* ASV7 */
153 {1050000, 900000, 850000, 850000, 850000}, /* ASV8 */
154};
155
156static unsigned int exynos4x12_int_volt[][EX4x12_LV_NUM] = {
157 /* 200 160 133 100 */
158 {1000000, 950000, 925000, 900000}, /* ASV0 */
159 {975000, 925000, 925000, 900000}, /* ASV1 */
160 {950000, 925000, 900000, 875000}, /* ASV2 */
161 {950000, 900000, 900000, 875000}, /* ASV3 */
162 {925000, 875000, 875000, 875000}, /* ASV4 */
163 {900000, 850000, 850000, 850000}, /* ASV5 */
164 {900000, 850000, 850000, 850000}, /* ASV6 */
165 {900000, 850000, 850000, 850000}, /* ASV7 */
166 {900000, 850000, 850000, 850000}, /* ASV8 */
167};
168
169/*** Clock Divider Data for Exynos4210 ***/
170static unsigned int exynos4210_clkdiv_dmc0[][8] = {
171 /*
172 * Clock divider value for following
173 * { DIVACP, DIVACP_PCLK, DIVDPHY, DIVDMC, DIVDMCD
174 * DIVDMCP, DIVCOPY2, DIVCORE_TIMERS }
175 */
176
177 /* DMC L0: 400MHz */
178 { 3, 1, 1, 1, 1, 1, 3, 1 },
179 /* DMC L1: 266.7MHz */
180 { 4, 1, 1, 2, 1, 1, 3, 1 },
181 /* DMC L2: 133MHz */
182 { 5, 1, 1, 5, 1, 1, 3, 1 },
183};
184static unsigned int exynos4210_clkdiv_top[][5] = {
185 /*
186 * Clock divider value for following
187 * { DIVACLK200, DIVACLK100, DIVACLK160, DIVACLK133, DIVONENAND }
188 */
189 /* ACLK200 L0: 200MHz */
190 { 3, 7, 4, 5, 1 },
191 /* ACLK200 L1: 160MHz */
192 { 4, 7, 5, 6, 1 },
193 /* ACLK200 L2: 133MHz */
194 { 5, 7, 7, 7, 1 },
195};
196static unsigned int exynos4210_clkdiv_lr_bus[][2] = {
197 /*
198 * Clock divider value for following
199 * { DIVGDL/R, DIVGPL/R }
200 */
201 /* ACLK_GDL/R L1: 200MHz */
202 { 3, 1 },
203 /* ACLK_GDL/R L2: 160MHz */
204 { 4, 1 },
205 /* ACLK_GDL/R L3: 133MHz */
206 { 5, 1 },
207};
208
209/*** Clock Divider Data for Exynos4212/4412 ***/
210static unsigned int exynos4x12_clkdiv_dmc0[][6] = {
211 /*
212 * Clock divider value for following
213 * { DIVACP, DIVACP_PCLK, DIVDPHY, DIVDMC, DIVDMCD
214 * DIVDMCP}
215 */
216
217 /* DMC L0: 400MHz */
218 {3, 1, 1, 1, 1, 1},
219 /* DMC L1: 266.7MHz */
220 {4, 1, 1, 2, 1, 1},
221 /* DMC L2: 160MHz */
222 {5, 1, 1, 4, 1, 1},
223 /* DMC L3: 133MHz */
224 {5, 1, 1, 5, 1, 1},
225 /* DMC L4: 100MHz */
226 {7, 1, 1, 7, 1, 1},
227};
228static unsigned int exynos4x12_clkdiv_dmc1[][6] = {
229 /*
230 * Clock divider value for following
231 * { G2DACP, DIVC2C, DIVC2C_ACLK }
232 */
233
234 /* DMC L0: 400MHz */
235 {3, 1, 1},
236 /* DMC L1: 266.7MHz */
237 {4, 2, 1},
238 /* DMC L2: 160MHz */
239 {5, 4, 1},
240 /* DMC L3: 133MHz */
241 {5, 5, 1},
242 /* DMC L4: 100MHz */
243 {7, 7, 1},
244};
245static unsigned int exynos4x12_clkdiv_top[][5] = {
246 /*
247 * Clock divider value for following
248 * { DIVACLK266_GPS, DIVACLK100, DIVACLK160,
249 DIVACLK133, DIVONENAND }
250 */
251
252 /* ACLK_GDL/R L0: 200MHz */
253 {2, 7, 4, 5, 1},
254 /* ACLK_GDL/R L1: 200MHz */
255 {2, 7, 4, 5, 1},
256 /* ACLK_GDL/R L2: 160MHz */
257 {4, 7, 5, 7, 1},
258 /* ACLK_GDL/R L3: 133MHz */
259 {4, 7, 5, 7, 1},
260 /* ACLK_GDL/R L4: 100MHz */
261 {7, 7, 7, 7, 1},
262};
263static unsigned int exynos4x12_clkdiv_lr_bus[][2] = {
264 /*
265 * Clock divider value for following
266 * { DIVGDL/R, DIVGPL/R }
267 */
268
269 /* ACLK_GDL/R L0: 200MHz */
270 {3, 1},
271 /* ACLK_GDL/R L1: 200MHz */
272 {3, 1},
273 /* ACLK_GDL/R L2: 160MHz */
274 {4, 1},
275 /* ACLK_GDL/R L3: 133MHz */
276 {5, 1},
277 /* ACLK_GDL/R L4: 100MHz */
278 {7, 1},
279};
280static unsigned int exynos4x12_clkdiv_sclkip[][3] = {
281 /*
282 * Clock divider value for following
283 * { DIVMFC, DIVJPEG, DIVFIMC0~3}
284 */
285
286 /* SCLK_MFC: 200MHz */
287 {3, 3, 4},
288 /* SCLK_MFC: 200MHz */
289 {3, 3, 4},
290 /* SCLK_MFC: 160MHz */
291 {4, 4, 5},
292 /* SCLK_MFC: 133MHz */
293 {5, 5, 5},
294 /* SCLK_MFC: 100MHz */
295 {7, 7, 7},
296};
297
298
299static int exynos4210_set_busclk(struct busfreq_data *data, struct opp *opp)
300{
301 unsigned int index;
302 unsigned int tmp;
303
304 for (index = LV_0; index < EX4210_LV_NUM; index++)
305 if (opp_get_freq(opp) == exynos4210_busclk_table[index].clk)
306 break;
307
308 if (index == EX4210_LV_NUM)
309 return -EINVAL;
310
311 /* Change Divider - DMC0 */
312 tmp = data->dmc_divtable[index];
313
314 __raw_writel(tmp, EXYNOS4_CLKDIV_DMC0);
315
316 do {
317 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_DMC0);
318 } while (tmp & 0x11111111);
319
320 /* Change Divider - TOP */
321 tmp = data->top_divtable[index];
322
323 __raw_writel(tmp, EXYNOS4_CLKDIV_TOP);
324
325 do {
326 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_TOP);
327 } while (tmp & 0x11111);
328
329 /* Change Divider - LEFTBUS */
330 tmp = __raw_readl(EXYNOS4_CLKDIV_LEFTBUS);
331
332 tmp &= ~(EXYNOS4_CLKDIV_BUS_GDLR_MASK | EXYNOS4_CLKDIV_BUS_GPLR_MASK);
333
334 tmp |= ((exynos4210_clkdiv_lr_bus[index][0] <<
335 EXYNOS4_CLKDIV_BUS_GDLR_SHIFT) |
336 (exynos4210_clkdiv_lr_bus[index][1] <<
337 EXYNOS4_CLKDIV_BUS_GPLR_SHIFT));
338
339 __raw_writel(tmp, EXYNOS4_CLKDIV_LEFTBUS);
340
341 do {
342 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_LEFTBUS);
343 } while (tmp & 0x11);
344
345 /* Change Divider - RIGHTBUS */
346 tmp = __raw_readl(EXYNOS4_CLKDIV_RIGHTBUS);
347
348 tmp &= ~(EXYNOS4_CLKDIV_BUS_GDLR_MASK | EXYNOS4_CLKDIV_BUS_GPLR_MASK);
349
350 tmp |= ((exynos4210_clkdiv_lr_bus[index][0] <<
351 EXYNOS4_CLKDIV_BUS_GDLR_SHIFT) |
352 (exynos4210_clkdiv_lr_bus[index][1] <<
353 EXYNOS4_CLKDIV_BUS_GPLR_SHIFT));
354
355 __raw_writel(tmp, EXYNOS4_CLKDIV_RIGHTBUS);
356
357 do {
358 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_RIGHTBUS);
359 } while (tmp & 0x11);
360
361 return 0;
362}
363
364static int exynos4x12_set_busclk(struct busfreq_data *data, struct opp *opp)
365{
366 unsigned int index;
367 unsigned int tmp;
368
369 for (index = LV_0; index < EX4x12_LV_NUM; index++)
370 if (opp_get_freq(opp) == exynos4x12_mifclk_table[index].clk)
371 break;
372
373 if (index == EX4x12_LV_NUM)
374 return -EINVAL;
375
376 /* Change Divider - DMC0 */
377 tmp = data->dmc_divtable[index];
378
379 __raw_writel(tmp, EXYNOS4_CLKDIV_DMC0);
380
381 do {
382 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_DMC0);
383 } while (tmp & 0x11111111);
384
385 /* Change Divider - DMC1 */
386 tmp = __raw_readl(EXYNOS4_CLKDIV_DMC1);
387
388 tmp &= ~(EXYNOS4_CLKDIV_DMC1_G2D_ACP_MASK |
389 EXYNOS4_CLKDIV_DMC1_C2C_MASK |
390 EXYNOS4_CLKDIV_DMC1_C2CACLK_MASK);
391
392 tmp |= ((exynos4x12_clkdiv_dmc1[index][0] <<
393 EXYNOS4_CLKDIV_DMC1_G2D_ACP_SHIFT) |
394 (exynos4x12_clkdiv_dmc1[index][1] <<
395 EXYNOS4_CLKDIV_DMC1_C2C_SHIFT) |
396 (exynos4x12_clkdiv_dmc1[index][2] <<
397 EXYNOS4_CLKDIV_DMC1_C2CACLK_SHIFT));
398
399 __raw_writel(tmp, EXYNOS4_CLKDIV_DMC1);
400
401 do {
402 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_DMC1);
403 } while (tmp & 0x111111);
404
405 /* Change Divider - TOP */
406 tmp = __raw_readl(EXYNOS4_CLKDIV_TOP);
407
408 tmp &= ~(EXYNOS4_CLKDIV_TOP_ACLK266_GPS_MASK |
409 EXYNOS4_CLKDIV_TOP_ACLK100_MASK |
410 EXYNOS4_CLKDIV_TOP_ACLK160_MASK |
411 EXYNOS4_CLKDIV_TOP_ACLK133_MASK |
412 EXYNOS4_CLKDIV_TOP_ONENAND_MASK);
413
414 tmp |= ((exynos4x12_clkdiv_top[index][0] <<
415 EXYNOS4_CLKDIV_TOP_ACLK266_GPS_SHIFT) |
416 (exynos4x12_clkdiv_top[index][1] <<
417 EXYNOS4_CLKDIV_TOP_ACLK100_SHIFT) |
418 (exynos4x12_clkdiv_top[index][2] <<
419 EXYNOS4_CLKDIV_TOP_ACLK160_SHIFT) |
420 (exynos4x12_clkdiv_top[index][3] <<
421 EXYNOS4_CLKDIV_TOP_ACLK133_SHIFT) |
422 (exynos4x12_clkdiv_top[index][4] <<
423 EXYNOS4_CLKDIV_TOP_ONENAND_SHIFT));
424
425 __raw_writel(tmp, EXYNOS4_CLKDIV_TOP);
426
427 do {
428 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_TOP);
429 } while (tmp & 0x11111);
430
431 /* Change Divider - LEFTBUS */
432 tmp = __raw_readl(EXYNOS4_CLKDIV_LEFTBUS);
433
434 tmp &= ~(EXYNOS4_CLKDIV_BUS_GDLR_MASK | EXYNOS4_CLKDIV_BUS_GPLR_MASK);
435
436 tmp |= ((exynos4x12_clkdiv_lr_bus[index][0] <<
437 EXYNOS4_CLKDIV_BUS_GDLR_SHIFT) |
438 (exynos4x12_clkdiv_lr_bus[index][1] <<
439 EXYNOS4_CLKDIV_BUS_GPLR_SHIFT));
440
441 __raw_writel(tmp, EXYNOS4_CLKDIV_LEFTBUS);
442
443 do {
444 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_LEFTBUS);
445 } while (tmp & 0x11);
446
447 /* Change Divider - RIGHTBUS */
448 tmp = __raw_readl(EXYNOS4_CLKDIV_RIGHTBUS);
449
450 tmp &= ~(EXYNOS4_CLKDIV_BUS_GDLR_MASK | EXYNOS4_CLKDIV_BUS_GPLR_MASK);
451
452 tmp |= ((exynos4x12_clkdiv_lr_bus[index][0] <<
453 EXYNOS4_CLKDIV_BUS_GDLR_SHIFT) |
454 (exynos4x12_clkdiv_lr_bus[index][1] <<
455 EXYNOS4_CLKDIV_BUS_GPLR_SHIFT));
456
457 __raw_writel(tmp, EXYNOS4_CLKDIV_RIGHTBUS);
458
459 do {
460 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_RIGHTBUS);
461 } while (tmp & 0x11);
462
463 /* Change Divider - MFC */
464 tmp = __raw_readl(EXYNOS4_CLKDIV_MFC);
465
466 tmp &= ~(EXYNOS4_CLKDIV_MFC_MASK);
467
468 tmp |= ((exynos4x12_clkdiv_sclkip[index][0] <<
469 EXYNOS4_CLKDIV_MFC_SHIFT));
470
471 __raw_writel(tmp, EXYNOS4_CLKDIV_MFC);
472
473 do {
474 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_MFC);
475 } while (tmp & 0x1);
476
477 /* Change Divider - JPEG */
478 tmp = __raw_readl(EXYNOS4_CLKDIV_CAM1);
479
480 tmp &= ~(EXYNOS4_CLKDIV_CAM1_JPEG_MASK);
481
482 tmp |= ((exynos4x12_clkdiv_sclkip[index][1] <<
483 EXYNOS4_CLKDIV_CAM1_JPEG_SHIFT));
484
485 __raw_writel(tmp, EXYNOS4_CLKDIV_CAM1);
486
487 do {
488 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_CAM1);
489 } while (tmp & 0x1);
490
491 /* Change Divider - FIMC0~3 */
492 tmp = __raw_readl(EXYNOS4_CLKDIV_CAM);
493
494 tmp &= ~(EXYNOS4_CLKDIV_CAM_FIMC0_MASK | EXYNOS4_CLKDIV_CAM_FIMC1_MASK |
495 EXYNOS4_CLKDIV_CAM_FIMC2_MASK | EXYNOS4_CLKDIV_CAM_FIMC3_MASK);
496
497 tmp |= ((exynos4x12_clkdiv_sclkip[index][2] <<
498 EXYNOS4_CLKDIV_CAM_FIMC0_SHIFT) |
499 (exynos4x12_clkdiv_sclkip[index][2] <<
500 EXYNOS4_CLKDIV_CAM_FIMC1_SHIFT) |
501 (exynos4x12_clkdiv_sclkip[index][2] <<
502 EXYNOS4_CLKDIV_CAM_FIMC2_SHIFT) |
503 (exynos4x12_clkdiv_sclkip[index][2] <<
504 EXYNOS4_CLKDIV_CAM_FIMC3_SHIFT));
505
506 __raw_writel(tmp, EXYNOS4_CLKDIV_CAM);
507
508 do {
509 tmp = __raw_readl(EXYNOS4_CLKDIV_STAT_CAM1);
510 } while (tmp & 0x1111);
511
512 return 0;
513}
514
515
516static void busfreq_mon_reset(struct busfreq_data *data)
517{
518 unsigned int i;
519
520 for (i = 0; i < 2; i++) {
521 void __iomem *ppmu_base = data->dmc[i].hw_base;
522
523 /* Reset PPMU */
524 __raw_writel(0x8000000f, ppmu_base + 0xf010);
525 __raw_writel(0x8000000f, ppmu_base + 0xf050);
526 __raw_writel(0x6, ppmu_base + 0xf000);
527 __raw_writel(0x0, ppmu_base + 0xf100);
528
529 /* Set PPMU Event */
530 data->dmc[i].event = 0x6;
531 __raw_writel(((data->dmc[i].event << 12) | 0x1),
532 ppmu_base + 0xfc);
533
534 /* Start PPMU */
535 __raw_writel(0x1, ppmu_base + 0xf000);
536 }
537}
538
539static void exynos4_read_ppmu(struct busfreq_data *data)
540{
541 int i, j;
542
543 for (i = 0; i < 2; i++) {
544 void __iomem *ppmu_base = data->dmc[i].hw_base;
545 u32 overflow;
546
547 /* Stop PPMU */
548 __raw_writel(0x0, ppmu_base + 0xf000);
549
550 /* Update local data from PPMU */
551 overflow = __raw_readl(ppmu_base + 0xf050);
552
553 data->dmc[i].ccnt = __raw_readl(ppmu_base + 0xf100);
554 data->dmc[i].ccnt_overflow = overflow & (1 << 31);
555
556 for (j = 0; j < PPMU_PMNCNT_MAX; j++) {
557 data->dmc[i].count[j] = __raw_readl(
558 ppmu_base + (0xf110 + (0x10 * j)));
559 data->dmc[i].count_overflow[j] = overflow & (1 << j);
560 }
561 }
562
563 busfreq_mon_reset(data);
564}
565
566static int exynos4x12_get_intspec(unsigned long mifclk)
567{
568 int i = 0;
569
570 while (exynos4x12_intclk_table[i].clk) {
571 if (exynos4x12_intclk_table[i].clk <= mifclk)
572 return i;
573 i++;
574 }
575
576 return -EINVAL;
577}
578
579static int exynos4_bus_setvolt(struct busfreq_data *data, struct opp *opp,
580 struct opp *oldopp)
581{
582 int err = 0, tmp;
583 unsigned long volt = opp_get_voltage(opp);
584
585 switch (data->type) {
586 case TYPE_BUSF_EXYNOS4210:
587 /* OPP represents DMC clock + INT voltage */
588 err = regulator_set_voltage(data->vdd_int, volt,
589 MAX_SAFEVOLT);
590 break;
591 case TYPE_BUSF_EXYNOS4x12:
592 /* OPP represents MIF clock + MIF voltage */
593 err = regulator_set_voltage(data->vdd_mif, volt,
594 MAX_SAFEVOLT);
595 if (err)
596 break;
597
598 tmp = exynos4x12_get_intspec(opp_get_freq(opp));
599 if (tmp < 0) {
600 err = tmp;
601 regulator_set_voltage(data->vdd_mif,
602 opp_get_voltage(oldopp),
603 MAX_SAFEVOLT);
604 break;
605 }
606 err = regulator_set_voltage(data->vdd_int,
607 exynos4x12_intclk_table[tmp].volt,
608 MAX_SAFEVOLT);
609 /* Try to recover */
610 if (err)
611 regulator_set_voltage(data->vdd_mif,
612 opp_get_voltage(oldopp),
613 MAX_SAFEVOLT);
614 break;
615 default:
616 err = -EINVAL;
617 }
618
619 return err;
620}
621
622static int exynos4_bus_target(struct device *dev, unsigned long *_freq,
623 u32 flags)
624{
625 int err = 0;
626 struct platform_device *pdev = container_of(dev, struct platform_device,
627 dev);
628 struct busfreq_data *data = platform_get_drvdata(pdev);
629 struct opp *opp = devfreq_recommended_opp(dev, _freq, flags);
630 unsigned long freq = opp_get_freq(opp);
631 unsigned long old_freq = opp_get_freq(data->curr_opp);
632
633 if (IS_ERR(opp))
634 return PTR_ERR(opp);
635
636 if (old_freq == freq)
637 return 0;
638
639 dev_dbg(dev, "targetting %lukHz %luuV\n", freq, opp_get_voltage(opp));
640
641 mutex_lock(&data->lock);
642
643 if (data->disabled)
644 goto out;
645
646 if (old_freq < freq)
647 err = exynos4_bus_setvolt(data, opp, data->curr_opp);
648 if (err)
649 goto out;
650
651 if (old_freq != freq) {
652 switch (data->type) {
653 case TYPE_BUSF_EXYNOS4210:
654 err = exynos4210_set_busclk(data, opp);
655 break;
656 case TYPE_BUSF_EXYNOS4x12:
657 err = exynos4x12_set_busclk(data, opp);
658 break;
659 default:
660 err = -EINVAL;
661 }
662 }
663 if (err)
664 goto out;
665
666 if (old_freq > freq)
667 err = exynos4_bus_setvolt(data, opp, data->curr_opp);
668 if (err)
669 goto out;
670
671 data->curr_opp = opp;
672out:
673 mutex_unlock(&data->lock);
674 return err;
675}
676
677static int exynos4_get_busier_dmc(struct busfreq_data *data)
678{
679 u64 p0 = data->dmc[0].count[0];
680 u64 p1 = data->dmc[1].count[0];
681
682 p0 *= data->dmc[1].ccnt;
683 p1 *= data->dmc[0].ccnt;
684
685 if (data->dmc[1].ccnt == 0)
686 return 0;
687
688 if (p0 > p1)
689 return 0;
690 return 1;
691}
692
693static int exynos4_bus_get_dev_status(struct device *dev,
694 struct devfreq_dev_status *stat)
695{
696 struct busfreq_data *data = dev_get_drvdata(dev);
697 int busier_dmc;
698 int cycles_x2 = 2; /* 2 x cycles */
699 void __iomem *addr;
700 u32 timing;
701 u32 memctrl;
702
703 exynos4_read_ppmu(data);
704 busier_dmc = exynos4_get_busier_dmc(data);
705 stat->current_frequency = opp_get_freq(data->curr_opp);
706
707 if (busier_dmc)
708 addr = S5P_VA_DMC1;
709 else
710 addr = S5P_VA_DMC0;
711
712 memctrl = __raw_readl(addr + 0x04); /* one of DDR2/3/LPDDR2 */
713 timing = __raw_readl(addr + 0x38); /* CL or WL/RL values */
714
715 switch ((memctrl >> 8) & 0xf) {
716 case 0x4: /* DDR2 */
717 cycles_x2 = ((timing >> 16) & 0xf) * 2;
718 break;
719 case 0x5: /* LPDDR2 */
720 case 0x6: /* DDR3 */
721 cycles_x2 = ((timing >> 8) & 0xf) + ((timing >> 0) & 0xf);
722 break;
723 default:
724 pr_err("%s: Unknown Memory Type(%d).\n", __func__,
725 (memctrl >> 8) & 0xf);
726 return -EINVAL;
727 }
728
729 /* Number of cycles spent on memory access */
730 stat->busy_time = data->dmc[busier_dmc].count[0] / 2 * (cycles_x2 + 2);
731 stat->busy_time *= 100 / BUS_SATURATION_RATIO;
732 stat->total_time = data->dmc[busier_dmc].ccnt;
733
734 /* If the counters have overflown, retry */
735 if (data->dmc[busier_dmc].ccnt_overflow ||
736 data->dmc[busier_dmc].count_overflow[0])
737 return -EAGAIN;
738
739 return 0;
740}
741
742static void exynos4_bus_exit(struct device *dev)
743{
744 struct busfreq_data *data = dev_get_drvdata(dev);
745
746 devfreq_unregister_opp_notifier(dev, data->devfreq);
747}
748
749static struct devfreq_dev_profile exynos4_devfreq_profile = {
750 .initial_freq = 400000,
751 .polling_ms = 50,
752 .target = exynos4_bus_target,
753 .get_dev_status = exynos4_bus_get_dev_status,
754 .exit = exynos4_bus_exit,
755};
756
757static int exynos4210_init_tables(struct busfreq_data *data)
758{
759 u32 tmp;
760 int mgrp;
761 int i, err = 0;
762
763 tmp = __raw_readl(EXYNOS4_CLKDIV_DMC0);
764 for (i = LV_0; i < EX4210_LV_NUM; i++) {
765 tmp &= ~(EXYNOS4_CLKDIV_DMC0_ACP_MASK |
766 EXYNOS4_CLKDIV_DMC0_ACPPCLK_MASK |
767 EXYNOS4_CLKDIV_DMC0_DPHY_MASK |
768 EXYNOS4_CLKDIV_DMC0_DMC_MASK |
769 EXYNOS4_CLKDIV_DMC0_DMCD_MASK |
770 EXYNOS4_CLKDIV_DMC0_DMCP_MASK |
771 EXYNOS4_CLKDIV_DMC0_COPY2_MASK |
772 EXYNOS4_CLKDIV_DMC0_CORETI_MASK);
773
774 tmp |= ((exynos4210_clkdiv_dmc0[i][0] <<
775 EXYNOS4_CLKDIV_DMC0_ACP_SHIFT) |
776 (exynos4210_clkdiv_dmc0[i][1] <<
777 EXYNOS4_CLKDIV_DMC0_ACPPCLK_SHIFT) |
778 (exynos4210_clkdiv_dmc0[i][2] <<
779 EXYNOS4_CLKDIV_DMC0_DPHY_SHIFT) |
780 (exynos4210_clkdiv_dmc0[i][3] <<
781 EXYNOS4_CLKDIV_DMC0_DMC_SHIFT) |
782 (exynos4210_clkdiv_dmc0[i][4] <<
783 EXYNOS4_CLKDIV_DMC0_DMCD_SHIFT) |
784 (exynos4210_clkdiv_dmc0[i][5] <<
785 EXYNOS4_CLKDIV_DMC0_DMCP_SHIFT) |
786 (exynos4210_clkdiv_dmc0[i][6] <<
787 EXYNOS4_CLKDIV_DMC0_COPY2_SHIFT) |
788 (exynos4210_clkdiv_dmc0[i][7] <<
789 EXYNOS4_CLKDIV_DMC0_CORETI_SHIFT));
790
791 data->dmc_divtable[i] = tmp;
792 }
793
794 tmp = __raw_readl(EXYNOS4_CLKDIV_TOP);
795 for (i = LV_0; i < EX4210_LV_NUM; i++) {
796 tmp &= ~(EXYNOS4_CLKDIV_TOP_ACLK200_MASK |
797 EXYNOS4_CLKDIV_TOP_ACLK100_MASK |
798 EXYNOS4_CLKDIV_TOP_ACLK160_MASK |
799 EXYNOS4_CLKDIV_TOP_ACLK133_MASK |
800 EXYNOS4_CLKDIV_TOP_ONENAND_MASK);
801
802 tmp |= ((exynos4210_clkdiv_top[i][0] <<
803 EXYNOS4_CLKDIV_TOP_ACLK200_SHIFT) |
804 (exynos4210_clkdiv_top[i][1] <<
805 EXYNOS4_CLKDIV_TOP_ACLK100_SHIFT) |
806 (exynos4210_clkdiv_top[i][2] <<
807 EXYNOS4_CLKDIV_TOP_ACLK160_SHIFT) |
808 (exynos4210_clkdiv_top[i][3] <<
809 EXYNOS4_CLKDIV_TOP_ACLK133_SHIFT) |
810 (exynos4210_clkdiv_top[i][4] <<
811 EXYNOS4_CLKDIV_TOP_ONENAND_SHIFT));
812
813 data->top_divtable[i] = tmp;
814 }
815
816#ifdef CONFIG_EXYNOS_ASV
817 tmp = exynos4_result_of_asv;
818#else
819 tmp = 0; /* Max voltages for the reliability of the unknown */
820#endif
821
822 pr_debug("ASV Group of Exynos4 is %d\n", tmp);
823 /* Use merged grouping for voltage */
824 switch (tmp) {
825 case 0:
826 mgrp = 0;
827 break;
828 case 1:
829 case 2:
830 mgrp = 1;
831 break;
832 case 3:
833 case 4:
834 mgrp = 2;
835 break;
836 case 5:
837 case 6:
838 mgrp = 3;
839 break;
840 case 7:
841 mgrp = 4;
842 break;
843 default:
844 pr_warn("Unknown ASV Group. Use max voltage.\n");
845 mgrp = 0;
846 }
847
848 for (i = LV_0; i < EX4210_LV_NUM; i++)
849 exynos4210_busclk_table[i].volt = exynos4210_asv_volt[mgrp][i];
850
851 for (i = LV_0; i < EX4210_LV_NUM; i++) {
852 err = opp_add(data->dev, exynos4210_busclk_table[i].clk,
853 exynos4210_busclk_table[i].volt);
854 if (err) {
855 dev_err(data->dev, "Cannot add opp entries.\n");
856 return err;
857 }
858 }
859
860
861 return 0;
862}
863
864static int exynos4x12_init_tables(struct busfreq_data *data)
865{
866 unsigned int i;
867 unsigned int tmp;
868 int ret;
869
870 /* Enable pause function for DREX2 DVFS */
871 tmp = __raw_readl(EXYNOS4_DMC_PAUSE_CTRL);
872 tmp |= EXYNOS4_DMC_PAUSE_ENABLE;
873 __raw_writel(tmp, EXYNOS4_DMC_PAUSE_CTRL);
874
875 tmp = __raw_readl(EXYNOS4_CLKDIV_DMC0);
876
877 for (i = 0; i < EX4x12_LV_NUM; i++) {
878 tmp &= ~(EXYNOS4_CLKDIV_DMC0_ACP_MASK |
879 EXYNOS4_CLKDIV_DMC0_ACPPCLK_MASK |
880 EXYNOS4_CLKDIV_DMC0_DPHY_MASK |
881 EXYNOS4_CLKDIV_DMC0_DMC_MASK |
882 EXYNOS4_CLKDIV_DMC0_DMCD_MASK |
883 EXYNOS4_CLKDIV_DMC0_DMCP_MASK);
884
885 tmp |= ((exynos4x12_clkdiv_dmc0[i][0] <<
886 EXYNOS4_CLKDIV_DMC0_ACP_SHIFT) |
887 (exynos4x12_clkdiv_dmc0[i][1] <<
888 EXYNOS4_CLKDIV_DMC0_ACPPCLK_SHIFT) |
889 (exynos4x12_clkdiv_dmc0[i][2] <<
890 EXYNOS4_CLKDIV_DMC0_DPHY_SHIFT) |
891 (exynos4x12_clkdiv_dmc0[i][3] <<
892 EXYNOS4_CLKDIV_DMC0_DMC_SHIFT) |
893 (exynos4x12_clkdiv_dmc0[i][4] <<
894 EXYNOS4_CLKDIV_DMC0_DMCD_SHIFT) |
895 (exynos4x12_clkdiv_dmc0[i][5] <<
896 EXYNOS4_CLKDIV_DMC0_DMCP_SHIFT));
897
898 data->dmc_divtable[i] = tmp;
899 }
900
901#ifdef CONFIG_EXYNOS_ASV
902 tmp = exynos4_result_of_asv;
903#else
904 tmp = 0; /* Max voltages for the reliability of the unknown */
905#endif
906
907 if (tmp > 8)
908 tmp = 0;
909 pr_debug("ASV Group of Exynos4x12 is %d\n", tmp);
910
911 for (i = 0; i < EX4x12_LV_NUM; i++) {
912 exynos4x12_mifclk_table[i].volt =
913 exynos4x12_mif_step_50[tmp][i];
914 exynos4x12_intclk_table[i].volt =
915 exynos4x12_int_volt[tmp][i];
916 }
917
918 for (i = 0; i < EX4x12_LV_NUM; i++) {
919 ret = opp_add(data->dev, exynos4x12_mifclk_table[i].clk,
920 exynos4x12_mifclk_table[i].volt);
921 if (ret) {
922 dev_err(data->dev, "Fail to add opp entries.\n");
923 return ret;
924 }
925 }
926
927 return 0;
928}
929
930static int exynos4_busfreq_pm_notifier_event(struct notifier_block *this,
931 unsigned long event, void *ptr)
932{
933 struct busfreq_data *data = container_of(this, struct busfreq_data,
934 pm_notifier);
935 struct opp *opp;
936 unsigned long maxfreq = ULONG_MAX;
937 int err = 0;
938
939 switch (event) {
940 case PM_SUSPEND_PREPARE:
941 /* Set Fastest and Deactivate DVFS */
942 mutex_lock(&data->lock);
943
944 data->disabled = true;
945
946 opp = opp_find_freq_floor(data->dev, &maxfreq);
947
948 err = exynos4_bus_setvolt(data, opp, data->curr_opp);
949 if (err)
950 goto unlock;
951
952 switch (data->type) {
953 case TYPE_BUSF_EXYNOS4210:
954 err = exynos4210_set_busclk(data, opp);
955 break;
956 case TYPE_BUSF_EXYNOS4x12:
957 err = exynos4x12_set_busclk(data, opp);
958 break;
959 default:
960 err = -EINVAL;
961 }
962 if (err)
963 goto unlock;
964
965 data->curr_opp = opp;
966unlock:
967 mutex_unlock(&data->lock);
968 if (err)
969 return err;
970 return NOTIFY_OK;
971 case PM_POST_RESTORE:
972 case PM_POST_SUSPEND:
973 /* Reactivate */
974 mutex_lock(&data->lock);
975 data->disabled = false;
976 mutex_unlock(&data->lock);
977 return NOTIFY_OK;
978 }
979
980 return NOTIFY_DONE;
981}
982
983static __devinit int exynos4_busfreq_probe(struct platform_device *pdev)
984{
985 struct busfreq_data *data;
986 struct opp *opp;
987 struct device *dev = &pdev->dev;
988 int err = 0;
989
990 data = kzalloc(sizeof(struct busfreq_data), GFP_KERNEL);
991 if (data == NULL) {
992 dev_err(dev, "Cannot allocate memory.\n");
993 return -ENOMEM;
994 }
995
996 data->type = pdev->id_entry->driver_data;
997 data->dmc[0].hw_base = S5P_VA_DMC0;
998 data->dmc[1].hw_base = S5P_VA_DMC1;
999 data->pm_notifier.notifier_call = exynos4_busfreq_pm_notifier_event;
1000 data->dev = dev;
1001 mutex_init(&data->lock);
1002
1003 switch (data->type) {
1004 case TYPE_BUSF_EXYNOS4210:
1005 err = exynos4210_init_tables(data);
1006 break;
1007 case TYPE_BUSF_EXYNOS4x12:
1008 err = exynos4x12_init_tables(data);
1009 break;
1010 default:
1011 dev_err(dev, "Cannot determine the device id %d\n", data->type);
1012 err = -EINVAL;
1013 }
1014 if (err)
1015 goto err_regulator;
1016
1017 data->vdd_int = regulator_get(dev, "vdd_int");
1018 if (IS_ERR(data->vdd_int)) {
1019 dev_err(dev, "Cannot get the regulator \"vdd_int\"\n");
1020 err = PTR_ERR(data->vdd_int);
1021 goto err_regulator;
1022 }
1023 if (data->type == TYPE_BUSF_EXYNOS4x12) {
1024 data->vdd_mif = regulator_get(dev, "vdd_mif");
1025 if (IS_ERR(data->vdd_mif)) {
1026 dev_err(dev, "Cannot get the regulator \"vdd_mif\"\n");
1027 err = PTR_ERR(data->vdd_mif);
1028 regulator_put(data->vdd_int);
1029 goto err_regulator;
1030
1031 }
1032 }
1033
1034 opp = opp_find_freq_floor(dev, &exynos4_devfreq_profile.initial_freq);
1035 if (IS_ERR(opp)) {
1036 dev_err(dev, "Invalid initial frequency %lu kHz.\n",
1037 exynos4_devfreq_profile.initial_freq);
1038 err = PTR_ERR(opp);
1039 goto err_opp_add;
1040 }
1041 data->curr_opp = opp;
1042
1043 platform_set_drvdata(pdev, data);
1044
1045 busfreq_mon_reset(data);
1046
1047 data->devfreq = devfreq_add_device(dev, &exynos4_devfreq_profile,
1048 &devfreq_simple_ondemand, NULL);
1049 if (IS_ERR(data->devfreq)) {
1050 err = PTR_ERR(data->devfreq);
1051 goto err_opp_add;
1052 }
1053
1054 devfreq_register_opp_notifier(dev, data->devfreq);
1055
1056 err = register_pm_notifier(&data->pm_notifier);
1057 if (err) {
1058 dev_err(dev, "Failed to setup pm notifier\n");
1059 goto err_devfreq_add;
1060 }
1061
1062 return 0;
1063err_devfreq_add:
1064 devfreq_remove_device(data->devfreq);
1065err_opp_add:
1066 if (data->vdd_mif)
1067 regulator_put(data->vdd_mif);
1068 regulator_put(data->vdd_int);
1069err_regulator:
1070 kfree(data);
1071 return err;
1072}
1073
1074static __devexit int exynos4_busfreq_remove(struct platform_device *pdev)
1075{
1076 struct busfreq_data *data = platform_get_drvdata(pdev);
1077
1078 unregister_pm_notifier(&data->pm_notifier);
1079 devfreq_remove_device(data->devfreq);
1080 regulator_put(data->vdd_int);
1081 if (data->vdd_mif)
1082 regulator_put(data->vdd_mif);
1083 kfree(data);
1084
1085 return 0;
1086}
1087
1088static int exynos4_busfreq_resume(struct device *dev)
1089{
1090 struct busfreq_data *data = dev_get_drvdata(dev);
1091
1092 busfreq_mon_reset(data);
1093 return 0;
1094}
1095
1096static const struct dev_pm_ops exynos4_busfreq_pm = {
1097 .resume = exynos4_busfreq_resume,
1098};
1099
1100static const struct platform_device_id exynos4_busfreq_id[] = {
1101 { "exynos4210-busfreq", TYPE_BUSF_EXYNOS4210 },
1102 { "exynos4412-busfreq", TYPE_BUSF_EXYNOS4x12 },
1103 { "exynos4212-busfreq", TYPE_BUSF_EXYNOS4x12 },
1104 { },
1105};
1106
1107static struct platform_driver exynos4_busfreq_driver = {
1108 .probe = exynos4_busfreq_probe,
1109 .remove = __devexit_p(exynos4_busfreq_remove),
1110 .id_table = exynos4_busfreq_id,
1111 .driver = {
1112 .name = "exynos4-busfreq",
1113 .owner = THIS_MODULE,
1114 .pm = &exynos4_busfreq_pm,
1115 },
1116};
1117
1118static int __init exynos4_busfreq_init(void)
1119{
1120 return platform_driver_register(&exynos4_busfreq_driver);
1121}
1122late_initcall(exynos4_busfreq_init);
1123
1124static void __exit exynos4_busfreq_exit(void)
1125{
1126 platform_driver_unregister(&exynos4_busfreq_driver);
1127}
1128module_exit(exynos4_busfreq_exit);
1129
1130MODULE_LICENSE("GPL");
1131MODULE_DESCRIPTION("EXYNOS4 busfreq driver with devfreq framework");
1132MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");