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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
30#include "pm.h"
31#include "smartreflex.h"
32
33#define SMARTREFLEX_NAME_LEN 16
34#define NVALUE_NAME_LEN 40
35#define SR_DISABLE_TIMEOUT 200
36
37struct 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 struct dentry *dbg_dir;
58};
59
60/* sr_list contains all the instances of smartreflex module */
61static LIST_HEAD(sr_list);
62
63static struct omap_sr_class_data *sr_class;
64static struct omap_sr_pmic_data *sr_pmic_data;
65
66static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
67{
68 __raw_writel(value, (sr->base + offset));
69}
70
71static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,
72 u32 value)
73{
74 u32 reg_val;
75 u32 errconfig_offs = 0, errconfig_mask = 0;
76
77 reg_val = __raw_readl(sr->base + offset);
78 reg_val &= ~mask;
79
80 /*
81 * Smartreflex error config register is special as it contains
82 * certain status bits which if written a 1 into means a clear
83 * of those bits. So in order to make sure no accidental write of
84 * 1 happens to those status bits, do a clear of them in the read
85 * value. This mean this API doesn't rewrite values in these bits
86 * if they are currently set, but does allow the caller to write
87 * those bits.
88 */
89 if (sr->ip_type == SR_TYPE_V1) {
90 errconfig_offs = ERRCONFIG_V1;
91 errconfig_mask = ERRCONFIG_STATUS_V1_MASK;
92 } else if (sr->ip_type == SR_TYPE_V2) {
93 errconfig_offs = ERRCONFIG_V2;
94 errconfig_mask = ERRCONFIG_VPBOUNDINTST_V2;
95 }
96
97 if (offset == errconfig_offs)
98 reg_val &= ~errconfig_mask;
99
100 reg_val |= value;
101
102 __raw_writel(reg_val, (sr->base + offset));
103}
104
105static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
106{
107 return __raw_readl(sr->base + offset);
108}
109
110static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm)
111{
112 struct omap_sr *sr_info;
113
114 if (!voltdm) {
115 pr_err("%s: Null voltage domain passed!\n", __func__);
116 return ERR_PTR(-EINVAL);
117 }
118
119 list_for_each_entry(sr_info, &sr_list, node) {
120 if (voltdm == sr_info->voltdm)
121 return sr_info;
122 }
123
124 return ERR_PTR(-ENODATA);
125}
126
127static irqreturn_t sr_interrupt(int irq, void *data)
128{
129 struct omap_sr *sr_info = (struct omap_sr *)data;
130 u32 status = 0;
131
132 if (sr_info->ip_type == SR_TYPE_V1) {
133 /* Read the status bits */
134 status = sr_read_reg(sr_info, ERRCONFIG_V1);
135
136 /* Clear them by writing back */
137 sr_write_reg(sr_info, ERRCONFIG_V1, status);
138 } else if (sr_info->ip_type == SR_TYPE_V2) {
139 /* Read the status bits */
140 sr_read_reg(sr_info, IRQSTATUS);
141
142 /* Clear them by writing back */
143 sr_write_reg(sr_info, IRQSTATUS, status);
144 }
145
146 if (sr_class->notify)
147 sr_class->notify(sr_info->voltdm, status);
148
149 return IRQ_HANDLED;
150}
151
152static void sr_set_clk_length(struct omap_sr *sr)
153{
154 struct clk *sys_ck;
155 u32 sys_clk_speed;
156
157 if (cpu_is_omap34xx())
158 sys_ck = clk_get(NULL, "sys_ck");
159 else
160 sys_ck = clk_get(NULL, "sys_clkin_ck");
161
162 if (IS_ERR(sys_ck)) {
163 dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n",
164 __func__);
165 return;
166 }
167 sys_clk_speed = clk_get_rate(sys_ck);
168 clk_put(sys_ck);
169
170 switch (sys_clk_speed) {
171 case 12000000:
172 sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK;
173 break;
174 case 13000000:
175 sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK;
176 break;
177 case 19200000:
178 sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK;
179 break;
180 case 26000000:
181 sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK;
182 break;
183 case 38400000:
184 sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK;
185 break;
186 default:
187 dev_err(&sr->pdev->dev, "%s: Invalid sysclk value: %d\n",
188 __func__, sys_clk_speed);
189 break;
190 }
191}
192
193static void sr_set_regfields(struct omap_sr *sr)
194{
195 /*
196 * For time being these values are defined in smartreflex.h
197 * and populated during init. May be they can be moved to board
198 * file or pmic specific data structure. In that case these structure
199 * fields will have to be populated using the pdata or pmic structure.
200 */
201 if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
202 sr->err_weight = OMAP3430_SR_ERRWEIGHT;
203 sr->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
204 sr->accum_data = OMAP3430_SR_ACCUMDATA;
205 if (!(strcmp(sr->voltdm->name, "mpu"))) {
206 sr->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
207 sr->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
208 } else {
209 sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
210 sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
211 }
212 }
213}
214
215static void sr_start_vddautocomp(struct omap_sr *sr)
216{
217 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
218 dev_warn(&sr->pdev->dev,
219 "%s: smartreflex class driver not registered\n",
220 __func__);
221 return;
222 }
223
224 if (!sr_class->enable(sr->voltdm))
225 sr->autocomp_active = true;
226}
227
228static void sr_stop_vddautocomp(struct omap_sr *sr)
229{
230 if (!sr_class || !(sr_class->disable)) {
231 dev_warn(&sr->pdev->dev,
232 "%s: smartreflex class driver not registered\n",
233 __func__);
234 return;
235 }
236
237 if (sr->autocomp_active) {
238 sr_class->disable(sr->voltdm, 1);
239 sr->autocomp_active = false;
240 }
241}
242
243/*
244 * This function handles the intializations which have to be done
245 * only when both sr device and class driver regiter has
246 * completed. This will be attempted to be called from both sr class
247 * driver register and sr device intializtion API's. Only one call
248 * will ultimately succeed.
249 *
250 * Currently this function registers interrrupt handler for a particular SR
251 * if smartreflex class driver is already registered and has
252 * requested for interrupts and the SR interrupt line in present.
253 */
254static int sr_late_init(struct omap_sr *sr_info)
255{
256 char *name;
257 struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data;
258 struct resource *mem;
259 int ret = 0;
260
261 if (sr_class->notify && sr_class->notify_flags && sr_info->irq) {
262 name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
263 if (name == NULL) {
264 ret = -ENOMEM;
265 goto error;
266 }
267 ret = request_irq(sr_info->irq, sr_interrupt,
268 0, name, (void *)sr_info);
269 if (ret)
270 goto error;
271 disable_irq(sr_info->irq);
272 }
273
274 if (pdata && pdata->enable_on_init)
275 sr_start_vddautocomp(sr_info);
276
277 return ret;
278
279error:
280 iounmap(sr_info->base);
281 mem = platform_get_resource(sr_info->pdev, IORESOURCE_MEM, 0);
282 release_mem_region(mem->start, resource_size(mem));
283 list_del(&sr_info->node);
284 dev_err(&sr_info->pdev->dev, "%s: ERROR in registering"
285 "interrupt handler. Smartreflex will"
286 "not function as desired\n", __func__);
287 kfree(name);
288 kfree(sr_info);
289 return ret;
290}
291
292static void sr_v1_disable(struct omap_sr *sr)
293{
294 int timeout = 0;
295
296 /* Enable MCUDisableAcknowledge interrupt */
297 sr_modify_reg(sr, ERRCONFIG_V1,
298 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
299
300 /* SRCONFIG - disable SR */
301 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
302
303 /* Disable all other SR interrupts and clear the status */
304 sr_modify_reg(sr, ERRCONFIG_V1,
305 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
306 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),
307 (ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
308 ERRCONFIG_MCUBOUNDINTST |
309 ERRCONFIG_VPBOUNDINTST_V1));
310
311 /*
312 * Wait for SR to be disabled.
313 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
314 */
315 omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
316 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
317 timeout);
318
319 if (timeout >= SR_DISABLE_TIMEOUT)
320 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
321 __func__);
322
323 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
324 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
325 ERRCONFIG_MCUDISACKINTST);
326}
327
328static void sr_v2_disable(struct omap_sr *sr)
329{
330 int timeout = 0;
331
332 /* Enable MCUDisableAcknowledge interrupt */
333 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
334
335 /* SRCONFIG - disable SR */
336 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
337
338 /* Disable all other SR interrupts and clear the status */
339 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
340 ERRCONFIG_VPBOUNDINTST_V2);
341 sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |
342 IRQENABLE_MCUVALIDINT |
343 IRQENABLE_MCUBOUNDSINT));
344 sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |
345 IRQSTATUS_MCVALIDINT |
346 IRQSTATUS_MCBOUNDSINT));
347
348 /*
349 * Wait for SR to be disabled.
350 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
351 */
352 omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
353 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
354 timeout);
355
356 if (timeout >= SR_DISABLE_TIMEOUT)
357 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
358 __func__);
359
360 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
361 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
362 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
363}
364
365static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs)
366{
367 int i;
368
369 if (!sr->nvalue_table) {
370 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
371 __func__);
372 return 0;
373 }
374
375 for (i = 0; i < sr->nvalue_count; i++) {
376 if (sr->nvalue_table[i].efuse_offs == efuse_offs)
377 return sr->nvalue_table[i].nvalue;
378 }
379
380 return 0;
381}
382
383/* Public Functions */
384
385/**
386 * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
387 * error generator module.
388 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
389 *
390 * This API is to be called from the smartreflex class driver to
391 * configure the error generator module inside the smartreflex module.
392 * SR settings if using the ERROR module inside Smartreflex.
393 * SR CLASS 3 by default uses only the ERROR module where as
394 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
395 * module. Returns 0 on success and error value in case of failure.
396 */
397int sr_configure_errgen(struct voltagedomain *voltdm)
398{
399 u32 sr_config, sr_errconfig, errconfig_offs, vpboundint_en;
400 u32 vpboundint_st, senp_en = 0, senn_en = 0;
401 u8 senp_shift, senn_shift;
402 struct omap_sr *sr = _sr_lookup(voltdm);
403
404 if (IS_ERR(sr)) {
405 pr_warning("%s: omap_sr struct for sr_%s not found\n",
406 __func__, voltdm->name);
407 return -EINVAL;
408 }
409
410 if (!sr->clk_length)
411 sr_set_clk_length(sr);
412
413 senp_en = sr->senp_mod;
414 senn_en = sr->senn_mod;
415
416 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
417 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
418
419 if (sr->ip_type == SR_TYPE_V1) {
420 sr_config |= SRCONFIG_DELAYCTRL;
421 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
422 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
423 errconfig_offs = ERRCONFIG_V1;
424 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
425 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
426 } else if (sr->ip_type == SR_TYPE_V2) {
427 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
428 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
429 errconfig_offs = ERRCONFIG_V2;
430 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
431 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
432 } else {
433 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
434 "module without specifying the ip\n", __func__);
435 return -EINVAL;
436 }
437
438 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
439 sr_write_reg(sr, SRCONFIG, sr_config);
440 sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |
441 (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |
442 (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);
443 sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |
444 SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),
445 sr_errconfig);
446
447 /* Enabling the interrupts if the ERROR module is used */
448 sr_modify_reg(sr, errconfig_offs,
449 vpboundint_en, (vpboundint_en | vpboundint_st));
450
451 return 0;
452}
453
454/**
455 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
456 * minmaxavg module.
457 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
458 *
459 * This API is to be called from the smartreflex class driver to
460 * configure the minmaxavg module inside the smartreflex module.
461 * SR settings if using the ERROR module inside Smartreflex.
462 * SR CLASS 3 by default uses only the ERROR module where as
463 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
464 * module. Returns 0 on success and error value in case of failure.
465 */
466int sr_configure_minmax(struct voltagedomain *voltdm)
467{
468 u32 sr_config, sr_avgwt;
469 u32 senp_en = 0, senn_en = 0;
470 u8 senp_shift, senn_shift;
471 struct omap_sr *sr = _sr_lookup(voltdm);
472
473 if (IS_ERR(sr)) {
474 pr_warning("%s: omap_sr struct for sr_%s not found\n",
475 __func__, voltdm->name);
476 return -EINVAL;
477 }
478
479 if (!sr->clk_length)
480 sr_set_clk_length(sr);
481
482 senp_en = sr->senp_mod;
483 senn_en = sr->senn_mod;
484
485 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
486 SRCONFIG_SENENABLE |
487 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
488
489 if (sr->ip_type == SR_TYPE_V1) {
490 sr_config |= SRCONFIG_DELAYCTRL;
491 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
492 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
493 } else if (sr->ip_type == SR_TYPE_V2) {
494 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
495 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
496 } else {
497 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
498 "module without specifying the ip\n", __func__);
499 return -EINVAL;
500 }
501
502 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
503 sr_write_reg(sr, SRCONFIG, sr_config);
504 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
505 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
506 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
507
508 /*
509 * Enabling the interrupts if MINMAXAVG module is used.
510 * TODO: check if all the interrupts are mandatory
511 */
512 if (sr->ip_type == SR_TYPE_V1) {
513 sr_modify_reg(sr, ERRCONFIG_V1,
514 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
515 ERRCONFIG_MCUBOUNDINTEN),
516 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
517 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
518 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
519 } else if (sr->ip_type == SR_TYPE_V2) {
520 sr_write_reg(sr, IRQSTATUS,
521 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
522 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
523 sr_write_reg(sr, IRQENABLE_SET,
524 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
525 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
526 }
527
528 return 0;
529}
530
531/**
532 * sr_enable() - Enables the smartreflex module.
533 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
534 * @volt: The voltage at which the Voltage domain associated with
535 * the smartreflex module is operating at.
536 * This is required only to program the correct Ntarget value.
537 *
538 * This API is to be called from the smartreflex class driver to
539 * enable a smartreflex module. Returns 0 on success. Returns error
540 * value if the voltage passed is wrong or if ntarget value is wrong.
541 */
542int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
543{
544 u32 nvalue_reciprocal;
545 struct omap_volt_data *volt_data;
546 struct omap_sr *sr = _sr_lookup(voltdm);
547 int ret;
548
549 if (IS_ERR(sr)) {
550 pr_warning("%s: omap_sr struct for sr_%s not found\n",
551 __func__, voltdm->name);
552 return -EINVAL;
553 }
554
555 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
556
557 if (IS_ERR(volt_data)) {
558 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
559 "for nominal voltage %ld\n", __func__, volt);
560 return -ENODATA;
561 }
562
563 nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
564
565 if (!nvalue_reciprocal) {
566 dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
567 __func__, volt);
568 return -ENODATA;
569 }
570
571 /* errminlimit is opp dependent and hence linked to voltage */
572 sr->err_minlimit = volt_data->sr_errminlimit;
573
574 pm_runtime_get_sync(&sr->pdev->dev);
575
576 /* Check if SR is already enabled. If yes do nothing */
577 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
578 return 0;
579
580 /* Configure SR */
581 ret = sr_class->configure(voltdm);
582 if (ret)
583 return ret;
584
585 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
586
587 /* SRCONFIG - enable SR */
588 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
589 return 0;
590}
591
592/**
593 * sr_disable() - Disables the smartreflex module.
594 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
595 *
596 * This API is to be called from the smartreflex class driver to
597 * disable a smartreflex module.
598 */
599void sr_disable(struct voltagedomain *voltdm)
600{
601 struct omap_sr *sr = _sr_lookup(voltdm);
602
603 if (IS_ERR(sr)) {
604 pr_warning("%s: omap_sr struct for sr_%s not found\n",
605 __func__, voltdm->name);
606 return;
607 }
608
609 /* Check if SR clocks are already disabled. If yes do nothing */
610 if (pm_runtime_suspended(&sr->pdev->dev))
611 return;
612
613 /*
614 * Disable SR if only it is indeed enabled. Else just
615 * disable the clocks.
616 */
617 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
618 if (sr->ip_type == SR_TYPE_V1)
619 sr_v1_disable(sr);
620 else if (sr->ip_type == SR_TYPE_V2)
621 sr_v2_disable(sr);
622 }
623
624 pm_runtime_put_sync_suspend(&sr->pdev->dev);
625}
626
627/**
628 * sr_register_class() - API to register a smartreflex class parameters.
629 * @class_data: The structure containing various sr class specific data.
630 *
631 * This API is to be called by the smartreflex class driver to register itself
632 * with the smartreflex driver during init. Returns 0 on success else the
633 * error value.
634 */
635int sr_register_class(struct omap_sr_class_data *class_data)
636{
637 struct omap_sr *sr_info;
638
639 if (!class_data) {
640 pr_warning("%s:, Smartreflex class data passed is NULL\n",
641 __func__);
642 return -EINVAL;
643 }
644
645 if (sr_class) {
646 pr_warning("%s: Smartreflex class driver already registered\n",
647 __func__);
648 return -EBUSY;
649 }
650
651 sr_class = class_data;
652
653 /*
654 * Call into late init to do intializations that require
655 * both sr driver and sr class driver to be initiallized.
656 */
657 list_for_each_entry(sr_info, &sr_list, node)
658 sr_late_init(sr_info);
659
660 return 0;
661}
662
663/**
664 * omap_sr_enable() - API to enable SR clocks and to call into the
665 * registered smartreflex class enable API.
666 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
667 *
668 * This API is to be called from the kernel in order to enable
669 * a particular smartreflex module. This API will do the initial
670 * configurations to turn on the smartreflex module and in turn call
671 * into the registered smartreflex class enable API.
672 */
673void omap_sr_enable(struct voltagedomain *voltdm)
674{
675 struct omap_sr *sr = _sr_lookup(voltdm);
676
677 if (IS_ERR(sr)) {
678 pr_warning("%s: omap_sr struct for sr_%s not found\n",
679 __func__, voltdm->name);
680 return;
681 }
682
683 if (!sr->autocomp_active)
684 return;
685
686 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
687 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
688 "registered\n", __func__);
689 return;
690 }
691
692 sr_class->enable(voltdm);
693}
694
695/**
696 * omap_sr_disable() - API to disable SR without resetting the voltage
697 * processor voltage
698 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
699 *
700 * This API is to be called from the kernel in order to disable
701 * a particular smartreflex module. This API will in turn call
702 * into the registered smartreflex class disable API. This API will tell
703 * the smartreflex class disable not to reset the VP voltage after
704 * disabling smartreflex.
705 */
706void omap_sr_disable(struct voltagedomain *voltdm)
707{
708 struct omap_sr *sr = _sr_lookup(voltdm);
709
710 if (IS_ERR(sr)) {
711 pr_warning("%s: omap_sr struct for sr_%s not found\n",
712 __func__, voltdm->name);
713 return;
714 }
715
716 if (!sr->autocomp_active)
717 return;
718
719 if (!sr_class || !(sr_class->disable)) {
720 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
721 "registered\n", __func__);
722 return;
723 }
724
725 sr_class->disable(voltdm, 0);
726}
727
728/**
729 * omap_sr_disable_reset_volt() - API to disable SR and reset the
730 * voltage processor voltage
731 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
732 *
733 * This API is to be called from the kernel in order to disable
734 * a particular smartreflex module. This API will in turn call
735 * into the registered smartreflex class disable API. This API will tell
736 * the smartreflex class disable to reset the VP voltage after
737 * disabling smartreflex.
738 */
739void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
740{
741 struct omap_sr *sr = _sr_lookup(voltdm);
742
743 if (IS_ERR(sr)) {
744 pr_warning("%s: omap_sr struct for sr_%s not found\n",
745 __func__, voltdm->name);
746 return;
747 }
748
749 if (!sr->autocomp_active)
750 return;
751
752 if (!sr_class || !(sr_class->disable)) {
753 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
754 "registered\n", __func__);
755 return;
756 }
757
758 sr_class->disable(voltdm, 1);
759}
760
761/**
762 * omap_sr_register_pmic() - API to register pmic specific info.
763 * @pmic_data: The structure containing pmic specific data.
764 *
765 * This API is to be called from the PMIC specific code to register with
766 * smartreflex driver pmic specific info. Currently the only info required
767 * is the smartreflex init on the PMIC side.
768 */
769void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
770{
771 if (!pmic_data) {
772 pr_warning("%s: Trying to register NULL PMIC data structure"
773 "with smartreflex\n", __func__);
774 return;
775 }
776
777 sr_pmic_data = pmic_data;
778}
779
780/* PM Debug Fs enteries to enable disable smartreflex. */
781static int omap_sr_autocomp_show(void *data, u64 *val)
782{
783 struct omap_sr *sr_info = (struct omap_sr *) data;
784
785 if (!sr_info) {
786 pr_warning("%s: omap_sr struct not found\n", __func__);
787 return -EINVAL;
788 }
789
790 *val = sr_info->autocomp_active;
791
792 return 0;
793}
794
795static int omap_sr_autocomp_store(void *data, u64 val)
796{
797 struct omap_sr *sr_info = (struct omap_sr *) data;
798
799 if (!sr_info) {
800 pr_warning("%s: omap_sr struct not found\n", __func__);
801 return -EINVAL;
802 }
803
804 /* Sanity check */
805 if (val && (val != 1)) {
806 pr_warning("%s: Invalid argument %lld\n", __func__, val);
807 return -EINVAL;
808 }
809
810 /* control enable/disable only if there is a delta in value */
811 if (sr_info->autocomp_active != val) {
812 if (!val)
813 sr_stop_vddautocomp(sr_info);
814 else
815 sr_start_vddautocomp(sr_info);
816 }
817
818 return 0;
819}
820
821DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
822 omap_sr_autocomp_store, "%llu\n");
823
824static int __init omap_sr_probe(struct platform_device *pdev)
825{
826 struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
827 struct omap_sr_data *pdata = pdev->dev.platform_data;
828 struct resource *mem, *irq;
829 struct dentry *vdd_dbg_dir, *nvalue_dir;
830 struct omap_volt_data *volt_data;
831 int i, ret = 0;
832
833 if (!sr_info) {
834 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
835 __func__);
836 return -ENOMEM;
837 }
838
839 if (!pdata) {
840 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
841 ret = -EINVAL;
842 goto err_free_devinfo;
843 }
844
845 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
846 if (!mem) {
847 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
848 ret = -ENODEV;
849 goto err_free_devinfo;
850 }
851
852 mem = request_mem_region(mem->start, resource_size(mem),
853 dev_name(&pdev->dev));
854 if (!mem) {
855 dev_err(&pdev->dev, "%s: no mem region\n", __func__);
856 ret = -EBUSY;
857 goto err_free_devinfo;
858 }
859
860 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
861
862 pm_runtime_enable(&pdev->dev);
863 pm_runtime_irq_safe(&pdev->dev);
864
865 sr_info->pdev = pdev;
866 sr_info->srid = pdev->id;
867 sr_info->voltdm = pdata->voltdm;
868 sr_info->nvalue_table = pdata->nvalue_table;
869 sr_info->nvalue_count = pdata->nvalue_count;
870 sr_info->senn_mod = pdata->senn_mod;
871 sr_info->senp_mod = pdata->senp_mod;
872 sr_info->autocomp_active = false;
873 sr_info->ip_type = pdata->ip_type;
874 sr_info->base = ioremap(mem->start, resource_size(mem));
875 if (!sr_info->base) {
876 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
877 ret = -ENOMEM;
878 goto err_release_region;
879 }
880
881 if (irq)
882 sr_info->irq = irq->start;
883
884 sr_set_clk_length(sr_info);
885 sr_set_regfields(sr_info);
886
887 list_add(&sr_info->node, &sr_list);
888
889 /*
890 * Call into late init to do intializations that require
891 * both sr driver and sr class driver to be initiallized.
892 */
893 if (sr_class) {
894 ret = sr_late_init(sr_info);
895 if (ret) {
896 pr_warning("%s: Error in SR late init\n", __func__);
897 return ret;
898 }
899 }
900
901 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
902
903 /*
904 * If the voltage domain debugfs directory is not created, do
905 * not try to create rest of the debugfs entries.
906 */
907 vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm);
908 if (!vdd_dbg_dir) {
909 ret = -EINVAL;
910 goto err_iounmap;
911 }
912
913 sr_info->dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir);
914 if (IS_ERR(sr_info->dbg_dir)) {
915 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
916 __func__);
917 ret = PTR_ERR(sr_info->dbg_dir);
918 goto err_iounmap;
919 }
920
921 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR,
922 sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops);
923 (void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir,
924 &sr_info->err_weight);
925 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir,
926 &sr_info->err_maxlimit);
927 (void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir,
928 &sr_info->err_minlimit);
929
930 nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir);
931 if (IS_ERR(nvalue_dir)) {
932 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
933 "for n-values\n", __func__);
934 ret = PTR_ERR(nvalue_dir);
935 goto err_debugfs;
936 }
937
938 omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
939 if (!volt_data) {
940 dev_warn(&pdev->dev, "%s: No Voltage table for the"
941 " corresponding vdd vdd_%s. Cannot create debugfs"
942 "entries for n-values\n",
943 __func__, sr_info->voltdm->name);
944 ret = -ENODATA;
945 goto err_debugfs;
946 }
947
948 for (i = 0; i < sr_info->nvalue_count; i++) {
949 char name[NVALUE_NAME_LEN + 1];
950
951 snprintf(name, sizeof(name), "volt_%d",
952 volt_data[i].volt_nominal);
953 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
954 &(sr_info->nvalue_table[i].nvalue));
955 }
956
957 return ret;
958
959err_debugfs:
960 debugfs_remove_recursive(sr_info->dbg_dir);
961err_iounmap:
962 list_del(&sr_info->node);
963 iounmap(sr_info->base);
964err_release_region:
965 release_mem_region(mem->start, resource_size(mem));
966err_free_devinfo:
967 kfree(sr_info);
968
969 return ret;
970}
971
972static int __devexit omap_sr_remove(struct platform_device *pdev)
973{
974 struct omap_sr_data *pdata = pdev->dev.platform_data;
975 struct omap_sr *sr_info;
976 struct resource *mem;
977
978 if (!pdata) {
979 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
980 return -EINVAL;
981 }
982
983 sr_info = _sr_lookup(pdata->voltdm);
984 if (IS_ERR(sr_info)) {
985 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
986 __func__);
987 return -EINVAL;
988 }
989
990 if (sr_info->autocomp_active)
991 sr_stop_vddautocomp(sr_info);
992 if (sr_info->dbg_dir)
993 debugfs_remove_recursive(sr_info->dbg_dir);
994
995 list_del(&sr_info->node);
996 iounmap(sr_info->base);
997 kfree(sr_info);
998 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
999 release_mem_region(mem->start, resource_size(mem));
1000
1001 return 0;
1002}
1003
1004static struct platform_driver smartreflex_driver = {
1005 .remove = omap_sr_remove,
1006 .driver = {
1007 .name = "smartreflex",
1008 },
1009};
1010
1011static int __init sr_init(void)
1012{
1013 int ret = 0;
1014
1015 /*
1016 * sr_init is a late init. If by then a pmic specific API is not
1017 * registered either there is no need for anything to be done on
1018 * the PMIC side or somebody has forgotten to register a PMIC
1019 * handler. Warn for the second condition.
1020 */
1021 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1022 sr_pmic_data->sr_pmic_init();
1023 else
1024 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1025
1026 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1027 if (ret) {
1028 pr_err("%s: platform driver register failed for SR\n",
1029 __func__);
1030 return ret;
1031 }
1032
1033 return 0;
1034}
1035
1036static void __exit sr_exit(void)
1037{
1038 platform_driver_unregister(&smartreflex_driver);
1039}
1040late_initcall(sr_init);
1041module_exit(sr_exit);
1042
1043MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1044MODULE_LICENSE("GPL");
1045MODULE_ALIAS("platform:" DRIVER_NAME);
1046MODULE_AUTHOR("Texas Instruments Inc");