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Merge branches 'fixes', 'pgt-next' and 'versatile' into devel
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / mach-omap2 / smartreflex.c
1 /*
2 * OMAP SmartReflex Voltage Control
3 *
4 * Author: Thara Gopinath <thara@ti.com>
5 *
6 * Copyright (C) 2010 Texas Instruments, Inc.
7 * Thara Gopinath <thara@ti.com>
8 *
9 * Copyright (C) 2008 Nokia Corporation
10 * Kalle Jokiniemi
11 *
12 * Copyright (C) 2007 Texas Instruments, Inc.
13 * Lesly A M <x0080970@ti.com>
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2 as
17 * published by the Free Software Foundation.
18 */
19
20 #include <linux/interrupt.h>
21 #include <linux/clk.h>
22 #include <linux/io.h>
23 #include <linux/debugfs.h>
24 #include <linux/delay.h>
25 #include <linux/slab.h>
26 #include <linux/pm_runtime.h>
27
28 #include <plat/common.h>
29 #include <plat/smartreflex.h>
30
31 #include "pm.h"
32
33 #define SMARTREFLEX_NAME_LEN 16
34 #define NVALUE_NAME_LEN 40
35 #define SR_DISABLE_TIMEOUT 200
36
37 struct omap_sr {
38 int srid;
39 int ip_type;
40 int nvalue_count;
41 bool autocomp_active;
42 u32 clk_length;
43 u32 err_weight;
44 u32 err_minlimit;
45 u32 err_maxlimit;
46 u32 accum_data;
47 u32 senn_avgweight;
48 u32 senp_avgweight;
49 u32 senp_mod;
50 u32 senn_mod;
51 unsigned int irq;
52 void __iomem *base;
53 struct platform_device *pdev;
54 struct list_head node;
55 struct omap_sr_nvalue_table *nvalue_table;
56 struct voltagedomain *voltdm;
57 };
58
59 /* sr_list contains all the instances of smartreflex module */
60 static LIST_HEAD(sr_list);
61
62 static struct omap_sr_class_data *sr_class;
63 static struct omap_sr_pmic_data *sr_pmic_data;
64
65 static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
66 {
67 __raw_writel(value, (sr->base + offset));
68 }
69
70 static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,
71 u32 value)
72 {
73 u32 reg_val;
74 u32 errconfig_offs = 0, errconfig_mask = 0;
75
76 reg_val = __raw_readl(sr->base + offset);
77 reg_val &= ~mask;
78
79 /*
80 * Smartreflex error config register is special as it contains
81 * certain status bits which if written a 1 into means a clear
82 * of those bits. So in order to make sure no accidental write of
83 * 1 happens to those status bits, do a clear of them in the read
84 * value. This mean this API doesn't rewrite values in these bits
85 * if they are currently set, but does allow the caller to write
86 * those bits.
87 */
88 if (sr->ip_type == SR_TYPE_V1) {
89 errconfig_offs = ERRCONFIG_V1;
90 errconfig_mask = ERRCONFIG_STATUS_V1_MASK;
91 } else if (sr->ip_type == SR_TYPE_V2) {
92 errconfig_offs = ERRCONFIG_V2;
93 errconfig_mask = ERRCONFIG_VPBOUNDINTST_V2;
94 }
95
96 if (offset == errconfig_offs)
97 reg_val &= ~errconfig_mask;
98
99 reg_val |= value;
100
101 __raw_writel(reg_val, (sr->base + offset));
102 }
103
104 static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
105 {
106 return __raw_readl(sr->base + offset);
107 }
108
109 static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm)
110 {
111 struct omap_sr *sr_info;
112
113 if (!voltdm) {
114 pr_err("%s: Null voltage domain passed!\n", __func__);
115 return ERR_PTR(-EINVAL);
116 }
117
118 list_for_each_entry(sr_info, &sr_list, node) {
119 if (voltdm == sr_info->voltdm)
120 return sr_info;
121 }
122
123 return ERR_PTR(-ENODATA);
124 }
125
126 static irqreturn_t sr_interrupt(int irq, void *data)
127 {
128 struct omap_sr *sr_info = (struct omap_sr *)data;
129 u32 status = 0;
130
131 if (sr_info->ip_type == SR_TYPE_V1) {
132 /* Read the status bits */
133 status = sr_read_reg(sr_info, ERRCONFIG_V1);
134
135 /* Clear them by writing back */
136 sr_write_reg(sr_info, ERRCONFIG_V1, status);
137 } else if (sr_info->ip_type == SR_TYPE_V2) {
138 /* Read the status bits */
139 sr_read_reg(sr_info, IRQSTATUS);
140
141 /* Clear them by writing back */
142 sr_write_reg(sr_info, IRQSTATUS, status);
143 }
144
145 if (sr_class->class_type == SR_CLASS2 && sr_class->notify)
146 sr_class->notify(sr_info->voltdm, status);
147
148 return IRQ_HANDLED;
149 }
150
151 static void sr_set_clk_length(struct omap_sr *sr)
152 {
153 struct clk *sys_ck;
154 u32 sys_clk_speed;
155
156 if (cpu_is_omap34xx())
157 sys_ck = clk_get(NULL, "sys_ck");
158 else
159 sys_ck = clk_get(NULL, "sys_clkin_ck");
160
161 if (IS_ERR(sys_ck)) {
162 dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n",
163 __func__);
164 return;
165 }
166 sys_clk_speed = clk_get_rate(sys_ck);
167 clk_put(sys_ck);
168
169 switch (sys_clk_speed) {
170 case 12000000:
171 sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK;
172 break;
173 case 13000000:
174 sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK;
175 break;
176 case 19200000:
177 sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK;
178 break;
179 case 26000000:
180 sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK;
181 break;
182 case 38400000:
183 sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK;
184 break;
185 default:
186 dev_err(&sr->pdev->dev, "%s: Invalid sysclk value: %d\n",
187 __func__, sys_clk_speed);
188 break;
189 }
190 }
191
192 static void sr_set_regfields(struct omap_sr *sr)
193 {
194 /*
195 * For time being these values are defined in smartreflex.h
196 * and populated during init. May be they can be moved to board
197 * file or pmic specific data structure. In that case these structure
198 * fields will have to be populated using the pdata or pmic structure.
199 */
200 if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
201 sr->err_weight = OMAP3430_SR_ERRWEIGHT;
202 sr->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
203 sr->accum_data = OMAP3430_SR_ACCUMDATA;
204 if (!(strcmp(sr->voltdm->name, "mpu"))) {
205 sr->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
206 sr->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
207 } else {
208 sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
209 sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
210 }
211 }
212 }
213
214 static void sr_start_vddautocomp(struct omap_sr *sr)
215 {
216 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
217 dev_warn(&sr->pdev->dev,
218 "%s: smartreflex class driver not registered\n",
219 __func__);
220 return;
221 }
222
223 if (!sr_class->enable(sr->voltdm))
224 sr->autocomp_active = true;
225 }
226
227 static void sr_stop_vddautocomp(struct omap_sr *sr)
228 {
229 if (!sr_class || !(sr_class->disable)) {
230 dev_warn(&sr->pdev->dev,
231 "%s: smartreflex class driver not registered\n",
232 __func__);
233 return;
234 }
235
236 if (sr->autocomp_active) {
237 sr_class->disable(sr->voltdm, 1);
238 sr->autocomp_active = false;
239 }
240 }
241
242 /*
243 * This function handles the intializations which have to be done
244 * only when both sr device and class driver regiter has
245 * completed. This will be attempted to be called from both sr class
246 * driver register and sr device intializtion API's. Only one call
247 * will ultimately succeed.
248 *
249 * Currenly this function registers interrrupt handler for a particular SR
250 * if smartreflex class driver is already registered and has
251 * requested for interrupts and the SR interrupt line in present.
252 */
253 static int sr_late_init(struct omap_sr *sr_info)
254 {
255 char *name;
256 struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data;
257 struct resource *mem;
258 int ret = 0;
259
260 if (sr_class->class_type == SR_CLASS2 &&
261 sr_class->notify_flags && sr_info->irq) {
262
263 name = kzalloc(SMARTREFLEX_NAME_LEN + 1, GFP_KERNEL);
264 strcpy(name, "sr_");
265 strcat(name, sr_info->voltdm->name);
266 ret = request_irq(sr_info->irq, sr_interrupt,
267 0, name, (void *)sr_info);
268 if (ret)
269 goto error;
270 }
271
272 if (pdata && pdata->enable_on_init)
273 sr_start_vddautocomp(sr_info);
274
275 return ret;
276
277 error:
278 iounmap(sr_info->base);
279 mem = platform_get_resource(sr_info->pdev, IORESOURCE_MEM, 0);
280 release_mem_region(mem->start, resource_size(mem));
281 list_del(&sr_info->node);
282 dev_err(&sr_info->pdev->dev, "%s: ERROR in registering"
283 "interrupt handler. Smartreflex will"
284 "not function as desired\n", __func__);
285 kfree(name);
286 kfree(sr_info);
287 return ret;
288 }
289
290 static void sr_v1_disable(struct omap_sr *sr)
291 {
292 int timeout = 0;
293
294 /* Enable MCUDisableAcknowledge interrupt */
295 sr_modify_reg(sr, ERRCONFIG_V1,
296 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
297
298 /* SRCONFIG - disable SR */
299 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
300
301 /* Disable all other SR interrupts and clear the status */
302 sr_modify_reg(sr, ERRCONFIG_V1,
303 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
304 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),
305 (ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
306 ERRCONFIG_MCUBOUNDINTST |
307 ERRCONFIG_VPBOUNDINTST_V1));
308
309 /*
310 * Wait for SR to be disabled.
311 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
312 */
313 omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
314 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
315 timeout);
316
317 if (timeout >= SR_DISABLE_TIMEOUT)
318 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
319 __func__);
320
321 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
322 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
323 ERRCONFIG_MCUDISACKINTST);
324 }
325
326 static void sr_v2_disable(struct omap_sr *sr)
327 {
328 int timeout = 0;
329
330 /* Enable MCUDisableAcknowledge interrupt */
331 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
332
333 /* SRCONFIG - disable SR */
334 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
335
336 /* Disable all other SR interrupts and clear the status */
337 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
338 ERRCONFIG_VPBOUNDINTST_V2);
339 sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |
340 IRQENABLE_MCUVALIDINT |
341 IRQENABLE_MCUBOUNDSINT));
342 sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |
343 IRQSTATUS_MCVALIDINT |
344 IRQSTATUS_MCBOUNDSINT));
345
346 /*
347 * Wait for SR to be disabled.
348 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
349 */
350 omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
351 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
352 timeout);
353
354 if (timeout >= SR_DISABLE_TIMEOUT)
355 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
356 __func__);
357
358 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
359 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
360 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
361 }
362
363 static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs)
364 {
365 int i;
366
367 if (!sr->nvalue_table) {
368 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
369 __func__);
370 return 0;
371 }
372
373 for (i = 0; i < sr->nvalue_count; i++) {
374 if (sr->nvalue_table[i].efuse_offs == efuse_offs)
375 return sr->nvalue_table[i].nvalue;
376 }
377
378 return 0;
379 }
380
381 /* Public Functions */
382
383 /**
384 * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
385 * error generator module.
386 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
387 *
388 * This API is to be called from the smartreflex class driver to
389 * configure the error generator module inside the smartreflex module.
390 * SR settings if using the ERROR module inside Smartreflex.
391 * SR CLASS 3 by default uses only the ERROR module where as
392 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
393 * module. Returns 0 on success and error value in case of failure.
394 */
395 int sr_configure_errgen(struct voltagedomain *voltdm)
396 {
397 u32 sr_config, sr_errconfig, errconfig_offs, vpboundint_en;
398 u32 vpboundint_st, senp_en = 0, senn_en = 0;
399 u8 senp_shift, senn_shift;
400 struct omap_sr *sr = _sr_lookup(voltdm);
401
402 if (IS_ERR(sr)) {
403 pr_warning("%s: omap_sr struct for sr_%s not found\n",
404 __func__, voltdm->name);
405 return -EINVAL;
406 }
407
408 if (!sr->clk_length)
409 sr_set_clk_length(sr);
410
411 senp_en = sr->senp_mod;
412 senn_en = sr->senn_mod;
413
414 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
415 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
416
417 if (sr->ip_type == SR_TYPE_V1) {
418 sr_config |= SRCONFIG_DELAYCTRL;
419 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
420 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
421 errconfig_offs = ERRCONFIG_V1;
422 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
423 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
424 } else if (sr->ip_type == SR_TYPE_V2) {
425 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
426 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
427 errconfig_offs = ERRCONFIG_V2;
428 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
429 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
430 } else {
431 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
432 "module without specifying the ip\n", __func__);
433 return -EINVAL;
434 }
435
436 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
437 sr_write_reg(sr, SRCONFIG, sr_config);
438 sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |
439 (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |
440 (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);
441 sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |
442 SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),
443 sr_errconfig);
444
445 /* Enabling the interrupts if the ERROR module is used */
446 sr_modify_reg(sr, errconfig_offs,
447 vpboundint_en, (vpboundint_en | vpboundint_st));
448
449 return 0;
450 }
451
452 /**
453 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
454 * minmaxavg module.
455 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
456 *
457 * This API is to be called from the smartreflex class driver to
458 * configure the minmaxavg module inside the smartreflex module.
459 * SR settings if using the ERROR module inside Smartreflex.
460 * SR CLASS 3 by default uses only the ERROR module where as
461 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
462 * module. Returns 0 on success and error value in case of failure.
463 */
464 int sr_configure_minmax(struct voltagedomain *voltdm)
465 {
466 u32 sr_config, sr_avgwt;
467 u32 senp_en = 0, senn_en = 0;
468 u8 senp_shift, senn_shift;
469 struct omap_sr *sr = _sr_lookup(voltdm);
470
471 if (IS_ERR(sr)) {
472 pr_warning("%s: omap_sr struct for sr_%s not found\n",
473 __func__, voltdm->name);
474 return -EINVAL;
475 }
476
477 if (!sr->clk_length)
478 sr_set_clk_length(sr);
479
480 senp_en = sr->senp_mod;
481 senn_en = sr->senn_mod;
482
483 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
484 SRCONFIG_SENENABLE |
485 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
486
487 if (sr->ip_type == SR_TYPE_V1) {
488 sr_config |= SRCONFIG_DELAYCTRL;
489 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
490 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
491 } else if (sr->ip_type == SR_TYPE_V2) {
492 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
493 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
494 } else {
495 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
496 "module without specifying the ip\n", __func__);
497 return -EINVAL;
498 }
499
500 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
501 sr_write_reg(sr, SRCONFIG, sr_config);
502 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
503 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
504 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
505
506 /*
507 * Enabling the interrupts if MINMAXAVG module is used.
508 * TODO: check if all the interrupts are mandatory
509 */
510 if (sr->ip_type == SR_TYPE_V1) {
511 sr_modify_reg(sr, ERRCONFIG_V1,
512 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
513 ERRCONFIG_MCUBOUNDINTEN),
514 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
515 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
516 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
517 } else if (sr->ip_type == SR_TYPE_V2) {
518 sr_write_reg(sr, IRQSTATUS,
519 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
520 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
521 sr_write_reg(sr, IRQENABLE_SET,
522 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
523 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
524 }
525
526 return 0;
527 }
528
529 /**
530 * sr_enable() - Enables the smartreflex module.
531 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
532 * @volt: The voltage at which the Voltage domain associated with
533 * the smartreflex module is operating at.
534 * This is required only to program the correct Ntarget value.
535 *
536 * This API is to be called from the smartreflex class driver to
537 * enable a smartreflex module. Returns 0 on success. Returns error
538 * value if the voltage passed is wrong or if ntarget value is wrong.
539 */
540 int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
541 {
542 u32 nvalue_reciprocal;
543 struct omap_volt_data *volt_data;
544 struct omap_sr *sr = _sr_lookup(voltdm);
545 int ret;
546
547 if (IS_ERR(sr)) {
548 pr_warning("%s: omap_sr struct for sr_%s not found\n",
549 __func__, voltdm->name);
550 return -EINVAL;
551 }
552
553 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
554
555 if (IS_ERR(volt_data)) {
556 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
557 "for nominal voltage %ld\n", __func__, volt);
558 return -ENODATA;
559 }
560
561 nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
562
563 if (!nvalue_reciprocal) {
564 dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
565 __func__, volt);
566 return -ENODATA;
567 }
568
569 /* errminlimit is opp dependent and hence linked to voltage */
570 sr->err_minlimit = volt_data->sr_errminlimit;
571
572 pm_runtime_get_sync(&sr->pdev->dev);
573
574 /* Check if SR is already enabled. If yes do nothing */
575 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
576 return 0;
577
578 /* Configure SR */
579 ret = sr_class->configure(voltdm);
580 if (ret)
581 return ret;
582
583 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
584
585 /* SRCONFIG - enable SR */
586 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
587 return 0;
588 }
589
590 /**
591 * sr_disable() - Disables the smartreflex module.
592 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
593 *
594 * This API is to be called from the smartreflex class driver to
595 * disable a smartreflex module.
596 */
597 void sr_disable(struct voltagedomain *voltdm)
598 {
599 struct omap_sr *sr = _sr_lookup(voltdm);
600
601 if (IS_ERR(sr)) {
602 pr_warning("%s: omap_sr struct for sr_%s not found\n",
603 __func__, voltdm->name);
604 return;
605 }
606
607 /* Check if SR clocks are already disabled. If yes do nothing */
608 if (pm_runtime_suspended(&sr->pdev->dev))
609 return;
610
611 /*
612 * Disable SR if only it is indeed enabled. Else just
613 * disable the clocks.
614 */
615 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
616 if (sr->ip_type == SR_TYPE_V1)
617 sr_v1_disable(sr);
618 else if (sr->ip_type == SR_TYPE_V2)
619 sr_v2_disable(sr);
620 }
621
622 pm_runtime_put_sync(&sr->pdev->dev);
623 }
624
625 /**
626 * sr_register_class() - API to register a smartreflex class parameters.
627 * @class_data: The structure containing various sr class specific data.
628 *
629 * This API is to be called by the smartreflex class driver to register itself
630 * with the smartreflex driver during init. Returns 0 on success else the
631 * error value.
632 */
633 int sr_register_class(struct omap_sr_class_data *class_data)
634 {
635 struct omap_sr *sr_info;
636
637 if (!class_data) {
638 pr_warning("%s:, Smartreflex class data passed is NULL\n",
639 __func__);
640 return -EINVAL;
641 }
642
643 if (sr_class) {
644 pr_warning("%s: Smartreflex class driver already registered\n",
645 __func__);
646 return -EBUSY;
647 }
648
649 sr_class = class_data;
650
651 /*
652 * Call into late init to do intializations that require
653 * both sr driver and sr class driver to be initiallized.
654 */
655 list_for_each_entry(sr_info, &sr_list, node)
656 sr_late_init(sr_info);
657
658 return 0;
659 }
660
661 /**
662 * omap_sr_enable() - API to enable SR clocks and to call into the
663 * registered smartreflex class enable API.
664 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
665 *
666 * This API is to be called from the kernel in order to enable
667 * a particular smartreflex module. This API will do the initial
668 * configurations to turn on the smartreflex module and in turn call
669 * into the registered smartreflex class enable API.
670 */
671 void omap_sr_enable(struct voltagedomain *voltdm)
672 {
673 struct omap_sr *sr = _sr_lookup(voltdm);
674
675 if (IS_ERR(sr)) {
676 pr_warning("%s: omap_sr struct for sr_%s not found\n",
677 __func__, voltdm->name);
678 return;
679 }
680
681 if (!sr->autocomp_active)
682 return;
683
684 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
685 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
686 "registered\n", __func__);
687 return;
688 }
689
690 sr_class->enable(voltdm);
691 }
692
693 /**
694 * omap_sr_disable() - API to disable SR without resetting the voltage
695 * processor voltage
696 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
697 *
698 * This API is to be called from the kernel in order to disable
699 * a particular smartreflex module. This API will in turn call
700 * into the registered smartreflex class disable API. This API will tell
701 * the smartreflex class disable not to reset the VP voltage after
702 * disabling smartreflex.
703 */
704 void omap_sr_disable(struct voltagedomain *voltdm)
705 {
706 struct omap_sr *sr = _sr_lookup(voltdm);
707
708 if (IS_ERR(sr)) {
709 pr_warning("%s: omap_sr struct for sr_%s not found\n",
710 __func__, voltdm->name);
711 return;
712 }
713
714 if (!sr->autocomp_active)
715 return;
716
717 if (!sr_class || !(sr_class->disable)) {
718 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
719 "registered\n", __func__);
720 return;
721 }
722
723 sr_class->disable(voltdm, 0);
724 }
725
726 /**
727 * omap_sr_disable_reset_volt() - API to disable SR and reset the
728 * voltage processor voltage
729 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
730 *
731 * This API is to be called from the kernel in order to disable
732 * a particular smartreflex module. This API will in turn call
733 * into the registered smartreflex class disable API. This API will tell
734 * the smartreflex class disable to reset the VP voltage after
735 * disabling smartreflex.
736 */
737 void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
738 {
739 struct omap_sr *sr = _sr_lookup(voltdm);
740
741 if (IS_ERR(sr)) {
742 pr_warning("%s: omap_sr struct for sr_%s not found\n",
743 __func__, voltdm->name);
744 return;
745 }
746
747 if (!sr->autocomp_active)
748 return;
749
750 if (!sr_class || !(sr_class->disable)) {
751 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
752 "registered\n", __func__);
753 return;
754 }
755
756 sr_class->disable(voltdm, 1);
757 }
758
759 /**
760 * omap_sr_register_pmic() - API to register pmic specific info.
761 * @pmic_data: The structure containing pmic specific data.
762 *
763 * This API is to be called from the PMIC specific code to register with
764 * smartreflex driver pmic specific info. Currently the only info required
765 * is the smartreflex init on the PMIC side.
766 */
767 void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
768 {
769 if (!pmic_data) {
770 pr_warning("%s: Trying to register NULL PMIC data structure"
771 "with smartreflex\n", __func__);
772 return;
773 }
774
775 sr_pmic_data = pmic_data;
776 }
777
778 /* PM Debug Fs enteries to enable disable smartreflex. */
779 static int omap_sr_autocomp_show(void *data, u64 *val)
780 {
781 struct omap_sr *sr_info = (struct omap_sr *) data;
782
783 if (!sr_info) {
784 pr_warning("%s: omap_sr struct not found\n", __func__);
785 return -EINVAL;
786 }
787
788 *val = sr_info->autocomp_active;
789
790 return 0;
791 }
792
793 static int omap_sr_autocomp_store(void *data, u64 val)
794 {
795 struct omap_sr *sr_info = (struct omap_sr *) data;
796
797 if (!sr_info) {
798 pr_warning("%s: omap_sr struct not found\n", __func__);
799 return -EINVAL;
800 }
801
802 /* Sanity check */
803 if (val && (val != 1)) {
804 pr_warning("%s: Invalid argument %lld\n", __func__, val);
805 return -EINVAL;
806 }
807
808 if (!val)
809 sr_stop_vddautocomp(sr_info);
810 else
811 sr_start_vddautocomp(sr_info);
812
813 return 0;
814 }
815
816 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
817 omap_sr_autocomp_store, "%llu\n");
818
819 static int __init omap_sr_probe(struct platform_device *pdev)
820 {
821 struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
822 struct omap_sr_data *pdata = pdev->dev.platform_data;
823 struct resource *mem, *irq;
824 struct dentry *vdd_dbg_dir, *dbg_dir, *nvalue_dir;
825 struct omap_volt_data *volt_data;
826 int i, ret = 0;
827
828 if (!sr_info) {
829 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
830 __func__);
831 return -ENOMEM;
832 }
833
834 if (!pdata) {
835 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
836 ret = -EINVAL;
837 goto err_free_devinfo;
838 }
839
840 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
841 if (!mem) {
842 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
843 ret = -ENODEV;
844 goto err_free_devinfo;
845 }
846
847 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
848
849 pm_runtime_enable(&pdev->dev);
850
851 sr_info->pdev = pdev;
852 sr_info->srid = pdev->id;
853 sr_info->voltdm = pdata->voltdm;
854 sr_info->nvalue_table = pdata->nvalue_table;
855 sr_info->nvalue_count = pdata->nvalue_count;
856 sr_info->senn_mod = pdata->senn_mod;
857 sr_info->senp_mod = pdata->senp_mod;
858 sr_info->autocomp_active = false;
859 sr_info->ip_type = pdata->ip_type;
860 sr_info->base = ioremap(mem->start, resource_size(mem));
861 if (!sr_info->base) {
862 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
863 ret = -ENOMEM;
864 goto err_release_region;
865 }
866
867 if (irq)
868 sr_info->irq = irq->start;
869
870 sr_set_clk_length(sr_info);
871 sr_set_regfields(sr_info);
872
873 list_add(&sr_info->node, &sr_list);
874
875 /*
876 * Call into late init to do intializations that require
877 * both sr driver and sr class driver to be initiallized.
878 */
879 if (sr_class) {
880 ret = sr_late_init(sr_info);
881 if (ret) {
882 pr_warning("%s: Error in SR late init\n", __func__);
883 goto err_release_region;
884 }
885 }
886
887 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
888
889 /*
890 * If the voltage domain debugfs directory is not created, do
891 * not try to create rest of the debugfs entries.
892 */
893 vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm);
894 if (!vdd_dbg_dir) {
895 ret = -EINVAL;
896 goto err_release_region;
897 }
898
899 dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir);
900 if (IS_ERR(dbg_dir)) {
901 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
902 __func__);
903 ret = PTR_ERR(dbg_dir);
904 goto err_release_region;
905 }
906
907 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR, dbg_dir,
908 (void *)sr_info, &pm_sr_fops);
909 (void) debugfs_create_x32("errweight", S_IRUGO, dbg_dir,
910 &sr_info->err_weight);
911 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, dbg_dir,
912 &sr_info->err_maxlimit);
913 (void) debugfs_create_x32("errminlimit", S_IRUGO, dbg_dir,
914 &sr_info->err_minlimit);
915
916 nvalue_dir = debugfs_create_dir("nvalue", dbg_dir);
917 if (IS_ERR(nvalue_dir)) {
918 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
919 "for n-values\n", __func__);
920 ret = PTR_ERR(nvalue_dir);
921 goto err_release_region;
922 }
923
924 omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
925 if (!volt_data) {
926 dev_warn(&pdev->dev, "%s: No Voltage table for the"
927 " corresponding vdd vdd_%s. Cannot create debugfs"
928 "entries for n-values\n",
929 __func__, sr_info->voltdm->name);
930 ret = -ENODATA;
931 goto err_release_region;
932 }
933
934 for (i = 0; i < sr_info->nvalue_count; i++) {
935 char name[NVALUE_NAME_LEN + 1];
936
937 snprintf(name, sizeof(name), "volt_%d",
938 volt_data[i].volt_nominal);
939 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
940 &(sr_info->nvalue_table[i].nvalue));
941 }
942
943 return ret;
944
945 err_release_region:
946 release_mem_region(mem->start, resource_size(mem));
947 err_free_devinfo:
948 kfree(sr_info);
949
950 return ret;
951 }
952
953 static int __devexit omap_sr_remove(struct platform_device *pdev)
954 {
955 struct omap_sr_data *pdata = pdev->dev.platform_data;
956 struct omap_sr *sr_info;
957 struct resource *mem;
958
959 if (!pdata) {
960 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
961 return -EINVAL;
962 }
963
964 sr_info = _sr_lookup(pdata->voltdm);
965 if (IS_ERR(sr_info)) {
966 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
967 __func__);
968 return -EINVAL;
969 }
970
971 if (sr_info->autocomp_active)
972 sr_stop_vddautocomp(sr_info);
973
974 list_del(&sr_info->node);
975 iounmap(sr_info->base);
976 kfree(sr_info);
977 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
978 release_mem_region(mem->start, resource_size(mem));
979
980 return 0;
981 }
982
983 static struct platform_driver smartreflex_driver = {
984 .remove = omap_sr_remove,
985 .driver = {
986 .name = "smartreflex",
987 },
988 };
989
990 static int __init sr_init(void)
991 {
992 int ret = 0;
993
994 /*
995 * sr_init is a late init. If by then a pmic specific API is not
996 * registered either there is no need for anything to be done on
997 * the PMIC side or somebody has forgotten to register a PMIC
998 * handler. Warn for the second condition.
999 */
1000 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1001 sr_pmic_data->sr_pmic_init();
1002 else
1003 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1004
1005 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1006 if (ret) {
1007 pr_err("%s: platform driver register failed for SR\n",
1008 __func__);
1009 return ret;
1010 }
1011
1012 return 0;
1013 }
1014
1015 static void __exit sr_exit(void)
1016 {
1017 platform_driver_unregister(&smartreflex_driver);
1018 }
1019 late_initcall(sr_init);
1020 module_exit(sr_exit);
1021
1022 MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1023 MODULE_LICENSE("GPL");
1024 MODULE_ALIAS("platform:" DRIVER_NAME);
1025 MODULE_AUTHOR("Texas Instruments Inc");
kernel source for telekom puls (alcatel/mediatek)