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Merge git://git.kernel.org/pub/scm/linux/kernel/git/nico/orion into fixes
[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
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
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 struct dentry *dbg_dir;
58 };
59
60 /* sr_list contains all the instances of smartreflex module */
61 static LIST_HEAD(sr_list);
62
63 static struct omap_sr_class_data *sr_class;
64 static struct omap_sr_pmic_data *sr_pmic_data;
65
66 static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
67 {
68 __raw_writel(value, (sr->base + offset));
69 }
70
71 static 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
105 static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
106 {
107 return __raw_readl(sr->base + offset);
108 }
109
110 static 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
127 static 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->class_type == SR_CLASS2 && sr_class->notify)
147 sr_class->notify(sr_info->voltdm, status);
148
149 return IRQ_HANDLED;
150 }
151
152 static 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
193 static 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
215 static 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
228 static 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 * Currenly 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 */
254 static 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->class_type == SR_CLASS2 &&
262 sr_class->notify_flags && sr_info->irq) {
263
264 name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
265 if (name == NULL) {
266 ret = -ENOMEM;
267 goto error;
268 }
269 ret = request_irq(sr_info->irq, sr_interrupt,
270 0, name, (void *)sr_info);
271 if (ret)
272 goto error;
273 }
274
275 if (pdata && pdata->enable_on_init)
276 sr_start_vddautocomp(sr_info);
277
278 return ret;
279
280 error:
281 iounmap(sr_info->base);
282 mem = platform_get_resource(sr_info->pdev, IORESOURCE_MEM, 0);
283 release_mem_region(mem->start, resource_size(mem));
284 list_del(&sr_info->node);
285 dev_err(&sr_info->pdev->dev, "%s: ERROR in registering"
286 "interrupt handler. Smartreflex will"
287 "not function as desired\n", __func__);
288 kfree(name);
289 kfree(sr_info);
290 return ret;
291 }
292
293 static void sr_v1_disable(struct omap_sr *sr)
294 {
295 int timeout = 0;
296
297 /* Enable MCUDisableAcknowledge interrupt */
298 sr_modify_reg(sr, ERRCONFIG_V1,
299 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
300
301 /* SRCONFIG - disable SR */
302 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
303
304 /* Disable all other SR interrupts and clear the status */
305 sr_modify_reg(sr, ERRCONFIG_V1,
306 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
307 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),
308 (ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
309 ERRCONFIG_MCUBOUNDINTST |
310 ERRCONFIG_VPBOUNDINTST_V1));
311
312 /*
313 * Wait for SR to be disabled.
314 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
315 */
316 omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
317 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
318 timeout);
319
320 if (timeout >= SR_DISABLE_TIMEOUT)
321 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
322 __func__);
323
324 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
325 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
326 ERRCONFIG_MCUDISACKINTST);
327 }
328
329 static void sr_v2_disable(struct omap_sr *sr)
330 {
331 int timeout = 0;
332
333 /* Enable MCUDisableAcknowledge interrupt */
334 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
335
336 /* SRCONFIG - disable SR */
337 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
338
339 /* Disable all other SR interrupts and clear the status */
340 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
341 ERRCONFIG_VPBOUNDINTST_V2);
342 sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |
343 IRQENABLE_MCUVALIDINT |
344 IRQENABLE_MCUBOUNDSINT));
345 sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |
346 IRQSTATUS_MCVALIDINT |
347 IRQSTATUS_MCBOUNDSINT));
348
349 /*
350 * Wait for SR to be disabled.
351 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
352 */
353 omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
354 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
355 timeout);
356
357 if (timeout >= SR_DISABLE_TIMEOUT)
358 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
359 __func__);
360
361 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
362 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
363 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
364 }
365
366 static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs)
367 {
368 int i;
369
370 if (!sr->nvalue_table) {
371 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
372 __func__);
373 return 0;
374 }
375
376 for (i = 0; i < sr->nvalue_count; i++) {
377 if (sr->nvalue_table[i].efuse_offs == efuse_offs)
378 return sr->nvalue_table[i].nvalue;
379 }
380
381 return 0;
382 }
383
384 /* Public Functions */
385
386 /**
387 * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
388 * error generator module.
389 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
390 *
391 * This API is to be called from the smartreflex class driver to
392 * configure the error generator module inside the smartreflex module.
393 * SR settings if using the ERROR module inside Smartreflex.
394 * SR CLASS 3 by default uses only the ERROR module where as
395 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
396 * module. Returns 0 on success and error value in case of failure.
397 */
398 int sr_configure_errgen(struct voltagedomain *voltdm)
399 {
400 u32 sr_config, sr_errconfig, errconfig_offs, vpboundint_en;
401 u32 vpboundint_st, senp_en = 0, senn_en = 0;
402 u8 senp_shift, senn_shift;
403 struct omap_sr *sr = _sr_lookup(voltdm);
404
405 if (IS_ERR(sr)) {
406 pr_warning("%s: omap_sr struct for sr_%s not found\n",
407 __func__, voltdm->name);
408 return -EINVAL;
409 }
410
411 if (!sr->clk_length)
412 sr_set_clk_length(sr);
413
414 senp_en = sr->senp_mod;
415 senn_en = sr->senn_mod;
416
417 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
418 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
419
420 if (sr->ip_type == SR_TYPE_V1) {
421 sr_config |= SRCONFIG_DELAYCTRL;
422 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
423 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
424 errconfig_offs = ERRCONFIG_V1;
425 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
426 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
427 } else if (sr->ip_type == SR_TYPE_V2) {
428 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
429 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
430 errconfig_offs = ERRCONFIG_V2;
431 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
432 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
433 } else {
434 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
435 "module without specifying the ip\n", __func__);
436 return -EINVAL;
437 }
438
439 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
440 sr_write_reg(sr, SRCONFIG, sr_config);
441 sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |
442 (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |
443 (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);
444 sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |
445 SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),
446 sr_errconfig);
447
448 /* Enabling the interrupts if the ERROR module is used */
449 sr_modify_reg(sr, errconfig_offs,
450 vpboundint_en, (vpboundint_en | vpboundint_st));
451
452 return 0;
453 }
454
455 /**
456 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
457 * minmaxavg module.
458 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
459 *
460 * This API is to be called from the smartreflex class driver to
461 * configure the minmaxavg module inside the smartreflex module.
462 * SR settings if using the ERROR module inside Smartreflex.
463 * SR CLASS 3 by default uses only the ERROR module where as
464 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
465 * module. Returns 0 on success and error value in case of failure.
466 */
467 int sr_configure_minmax(struct voltagedomain *voltdm)
468 {
469 u32 sr_config, sr_avgwt;
470 u32 senp_en = 0, senn_en = 0;
471 u8 senp_shift, senn_shift;
472 struct omap_sr *sr = _sr_lookup(voltdm);
473
474 if (IS_ERR(sr)) {
475 pr_warning("%s: omap_sr struct for sr_%s not found\n",
476 __func__, voltdm->name);
477 return -EINVAL;
478 }
479
480 if (!sr->clk_length)
481 sr_set_clk_length(sr);
482
483 senp_en = sr->senp_mod;
484 senn_en = sr->senn_mod;
485
486 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
487 SRCONFIG_SENENABLE |
488 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
489
490 if (sr->ip_type == SR_TYPE_V1) {
491 sr_config |= SRCONFIG_DELAYCTRL;
492 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
493 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
494 } else if (sr->ip_type == SR_TYPE_V2) {
495 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
496 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
497 } else {
498 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
499 "module without specifying the ip\n", __func__);
500 return -EINVAL;
501 }
502
503 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
504 sr_write_reg(sr, SRCONFIG, sr_config);
505 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
506 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
507 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
508
509 /*
510 * Enabling the interrupts if MINMAXAVG module is used.
511 * TODO: check if all the interrupts are mandatory
512 */
513 if (sr->ip_type == SR_TYPE_V1) {
514 sr_modify_reg(sr, ERRCONFIG_V1,
515 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
516 ERRCONFIG_MCUBOUNDINTEN),
517 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
518 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
519 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
520 } else if (sr->ip_type == SR_TYPE_V2) {
521 sr_write_reg(sr, IRQSTATUS,
522 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
523 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
524 sr_write_reg(sr, IRQENABLE_SET,
525 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
526 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
527 }
528
529 return 0;
530 }
531
532 /**
533 * sr_enable() - Enables the smartreflex module.
534 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
535 * @volt: The voltage at which the Voltage domain associated with
536 * the smartreflex module is operating at.
537 * This is required only to program the correct Ntarget value.
538 *
539 * This API is to be called from the smartreflex class driver to
540 * enable a smartreflex module. Returns 0 on success. Returns error
541 * value if the voltage passed is wrong or if ntarget value is wrong.
542 */
543 int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
544 {
545 u32 nvalue_reciprocal;
546 struct omap_volt_data *volt_data;
547 struct omap_sr *sr = _sr_lookup(voltdm);
548 int ret;
549
550 if (IS_ERR(sr)) {
551 pr_warning("%s: omap_sr struct for sr_%s not found\n",
552 __func__, voltdm->name);
553 return -EINVAL;
554 }
555
556 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
557
558 if (IS_ERR(volt_data)) {
559 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
560 "for nominal voltage %ld\n", __func__, volt);
561 return -ENODATA;
562 }
563
564 nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
565
566 if (!nvalue_reciprocal) {
567 dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
568 __func__, volt);
569 return -ENODATA;
570 }
571
572 /* errminlimit is opp dependent and hence linked to voltage */
573 sr->err_minlimit = volt_data->sr_errminlimit;
574
575 pm_runtime_get_sync(&sr->pdev->dev);
576
577 /* Check if SR is already enabled. If yes do nothing */
578 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
579 return 0;
580
581 /* Configure SR */
582 ret = sr_class->configure(voltdm);
583 if (ret)
584 return ret;
585
586 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
587
588 /* SRCONFIG - enable SR */
589 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
590 return 0;
591 }
592
593 /**
594 * sr_disable() - Disables the smartreflex module.
595 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
596 *
597 * This API is to be called from the smartreflex class driver to
598 * disable a smartreflex module.
599 */
600 void sr_disable(struct voltagedomain *voltdm)
601 {
602 struct omap_sr *sr = _sr_lookup(voltdm);
603
604 if (IS_ERR(sr)) {
605 pr_warning("%s: omap_sr struct for sr_%s not found\n",
606 __func__, voltdm->name);
607 return;
608 }
609
610 /* Check if SR clocks are already disabled. If yes do nothing */
611 if (pm_runtime_suspended(&sr->pdev->dev))
612 return;
613
614 /*
615 * Disable SR if only it is indeed enabled. Else just
616 * disable the clocks.
617 */
618 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
619 if (sr->ip_type == SR_TYPE_V1)
620 sr_v1_disable(sr);
621 else if (sr->ip_type == SR_TYPE_V2)
622 sr_v2_disable(sr);
623 }
624
625 pm_runtime_put_sync(&sr->pdev->dev);
626 }
627
628 /**
629 * sr_register_class() - API to register a smartreflex class parameters.
630 * @class_data: The structure containing various sr class specific data.
631 *
632 * This API is to be called by the smartreflex class driver to register itself
633 * with the smartreflex driver during init. Returns 0 on success else the
634 * error value.
635 */
636 int sr_register_class(struct omap_sr_class_data *class_data)
637 {
638 struct omap_sr *sr_info;
639
640 if (!class_data) {
641 pr_warning("%s:, Smartreflex class data passed is NULL\n",
642 __func__);
643 return -EINVAL;
644 }
645
646 if (sr_class) {
647 pr_warning("%s: Smartreflex class driver already registered\n",
648 __func__);
649 return -EBUSY;
650 }
651
652 sr_class = class_data;
653
654 /*
655 * Call into late init to do intializations that require
656 * both sr driver and sr class driver to be initiallized.
657 */
658 list_for_each_entry(sr_info, &sr_list, node)
659 sr_late_init(sr_info);
660
661 return 0;
662 }
663
664 /**
665 * omap_sr_enable() - API to enable SR clocks and to call into the
666 * registered smartreflex class enable API.
667 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
668 *
669 * This API is to be called from the kernel in order to enable
670 * a particular smartreflex module. This API will do the initial
671 * configurations to turn on the smartreflex module and in turn call
672 * into the registered smartreflex class enable API.
673 */
674 void omap_sr_enable(struct voltagedomain *voltdm)
675 {
676 struct omap_sr *sr = _sr_lookup(voltdm);
677
678 if (IS_ERR(sr)) {
679 pr_warning("%s: omap_sr struct for sr_%s not found\n",
680 __func__, voltdm->name);
681 return;
682 }
683
684 if (!sr->autocomp_active)
685 return;
686
687 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
688 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
689 "registered\n", __func__);
690 return;
691 }
692
693 sr_class->enable(voltdm);
694 }
695
696 /**
697 * omap_sr_disable() - API to disable SR without resetting the voltage
698 * processor voltage
699 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
700 *
701 * This API is to be called from the kernel in order to disable
702 * a particular smartreflex module. This API will in turn call
703 * into the registered smartreflex class disable API. This API will tell
704 * the smartreflex class disable not to reset the VP voltage after
705 * disabling smartreflex.
706 */
707 void omap_sr_disable(struct voltagedomain *voltdm)
708 {
709 struct omap_sr *sr = _sr_lookup(voltdm);
710
711 if (IS_ERR(sr)) {
712 pr_warning("%s: omap_sr struct for sr_%s not found\n",
713 __func__, voltdm->name);
714 return;
715 }
716
717 if (!sr->autocomp_active)
718 return;
719
720 if (!sr_class || !(sr_class->disable)) {
721 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
722 "registered\n", __func__);
723 return;
724 }
725
726 sr_class->disable(voltdm, 0);
727 }
728
729 /**
730 * omap_sr_disable_reset_volt() - API to disable SR and reset the
731 * voltage processor voltage
732 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
733 *
734 * This API is to be called from the kernel in order to disable
735 * a particular smartreflex module. This API will in turn call
736 * into the registered smartreflex class disable API. This API will tell
737 * the smartreflex class disable to reset the VP voltage after
738 * disabling smartreflex.
739 */
740 void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
741 {
742 struct omap_sr *sr = _sr_lookup(voltdm);
743
744 if (IS_ERR(sr)) {
745 pr_warning("%s: omap_sr struct for sr_%s not found\n",
746 __func__, voltdm->name);
747 return;
748 }
749
750 if (!sr->autocomp_active)
751 return;
752
753 if (!sr_class || !(sr_class->disable)) {
754 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
755 "registered\n", __func__);
756 return;
757 }
758
759 sr_class->disable(voltdm, 1);
760 }
761
762 /**
763 * omap_sr_register_pmic() - API to register pmic specific info.
764 * @pmic_data: The structure containing pmic specific data.
765 *
766 * This API is to be called from the PMIC specific code to register with
767 * smartreflex driver pmic specific info. Currently the only info required
768 * is the smartreflex init on the PMIC side.
769 */
770 void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
771 {
772 if (!pmic_data) {
773 pr_warning("%s: Trying to register NULL PMIC data structure"
774 "with smartreflex\n", __func__);
775 return;
776 }
777
778 sr_pmic_data = pmic_data;
779 }
780
781 /* PM Debug Fs enteries to enable disable smartreflex. */
782 static int omap_sr_autocomp_show(void *data, u64 *val)
783 {
784 struct omap_sr *sr_info = (struct omap_sr *) data;
785
786 if (!sr_info) {
787 pr_warning("%s: omap_sr struct not found\n", __func__);
788 return -EINVAL;
789 }
790
791 *val = sr_info->autocomp_active;
792
793 return 0;
794 }
795
796 static int omap_sr_autocomp_store(void *data, u64 val)
797 {
798 struct omap_sr *sr_info = (struct omap_sr *) data;
799
800 if (!sr_info) {
801 pr_warning("%s: omap_sr struct not found\n", __func__);
802 return -EINVAL;
803 }
804
805 /* Sanity check */
806 if (val && (val != 1)) {
807 pr_warning("%s: Invalid argument %lld\n", __func__, val);
808 return -EINVAL;
809 }
810
811 if (!val)
812 sr_stop_vddautocomp(sr_info);
813 else
814 sr_start_vddautocomp(sr_info);
815
816 return 0;
817 }
818
819 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
820 omap_sr_autocomp_store, "%llu\n");
821
822 static int __init omap_sr_probe(struct platform_device *pdev)
823 {
824 struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
825 struct omap_sr_data *pdata = pdev->dev.platform_data;
826 struct resource *mem, *irq;
827 struct dentry *vdd_dbg_dir, *nvalue_dir;
828 struct omap_volt_data *volt_data;
829 int i, ret = 0;
830
831 if (!sr_info) {
832 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
833 __func__);
834 return -ENOMEM;
835 }
836
837 if (!pdata) {
838 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
839 ret = -EINVAL;
840 goto err_free_devinfo;
841 }
842
843 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
844 if (!mem) {
845 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
846 ret = -ENODEV;
847 goto err_free_devinfo;
848 }
849
850 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
851
852 pm_runtime_enable(&pdev->dev);
853
854 sr_info->pdev = pdev;
855 sr_info->srid = pdev->id;
856 sr_info->voltdm = pdata->voltdm;
857 sr_info->nvalue_table = pdata->nvalue_table;
858 sr_info->nvalue_count = pdata->nvalue_count;
859 sr_info->senn_mod = pdata->senn_mod;
860 sr_info->senp_mod = pdata->senp_mod;
861 sr_info->autocomp_active = false;
862 sr_info->ip_type = pdata->ip_type;
863 sr_info->base = ioremap(mem->start, resource_size(mem));
864 if (!sr_info->base) {
865 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
866 ret = -ENOMEM;
867 goto err_release_region;
868 }
869
870 if (irq)
871 sr_info->irq = irq->start;
872
873 sr_set_clk_length(sr_info);
874 sr_set_regfields(sr_info);
875
876 list_add(&sr_info->node, &sr_list);
877
878 /*
879 * Call into late init to do intializations that require
880 * both sr driver and sr class driver to be initiallized.
881 */
882 if (sr_class) {
883 ret = sr_late_init(sr_info);
884 if (ret) {
885 pr_warning("%s: Error in SR late init\n", __func__);
886 goto err_release_region;
887 }
888 }
889
890 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
891
892 /*
893 * If the voltage domain debugfs directory is not created, do
894 * not try to create rest of the debugfs entries.
895 */
896 vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm);
897 if (!vdd_dbg_dir) {
898 ret = -EINVAL;
899 goto err_release_region;
900 }
901
902 sr_info->dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir);
903 if (IS_ERR(sr_info->dbg_dir)) {
904 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
905 __func__);
906 ret = PTR_ERR(sr_info->dbg_dir);
907 goto err_release_region;
908 }
909
910 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR,
911 sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops);
912 (void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir,
913 &sr_info->err_weight);
914 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir,
915 &sr_info->err_maxlimit);
916 (void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir,
917 &sr_info->err_minlimit);
918
919 nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir);
920 if (IS_ERR(nvalue_dir)) {
921 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
922 "for n-values\n", __func__);
923 ret = PTR_ERR(nvalue_dir);
924 goto err_release_region;
925 }
926
927 omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
928 if (!volt_data) {
929 dev_warn(&pdev->dev, "%s: No Voltage table for the"
930 " corresponding vdd vdd_%s. Cannot create debugfs"
931 "entries for n-values\n",
932 __func__, sr_info->voltdm->name);
933 ret = -ENODATA;
934 goto err_release_region;
935 }
936
937 for (i = 0; i < sr_info->nvalue_count; i++) {
938 char name[NVALUE_NAME_LEN + 1];
939
940 snprintf(name, sizeof(name), "volt_%d",
941 volt_data[i].volt_nominal);
942 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
943 &(sr_info->nvalue_table[i].nvalue));
944 }
945
946 return ret;
947
948 err_release_region:
949 release_mem_region(mem->start, resource_size(mem));
950 err_free_devinfo:
951 kfree(sr_info);
952
953 return ret;
954 }
955
956 static int __devexit omap_sr_remove(struct platform_device *pdev)
957 {
958 struct omap_sr_data *pdata = pdev->dev.platform_data;
959 struct omap_sr *sr_info;
960 struct resource *mem;
961
962 if (!pdata) {
963 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
964 return -EINVAL;
965 }
966
967 sr_info = _sr_lookup(pdata->voltdm);
968 if (IS_ERR(sr_info)) {
969 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
970 __func__);
971 return -EINVAL;
972 }
973
974 if (sr_info->autocomp_active)
975 sr_stop_vddautocomp(sr_info);
976 if (sr_info->dbg_dir)
977 debugfs_remove_recursive(sr_info->dbg_dir);
978
979 list_del(&sr_info->node);
980 iounmap(sr_info->base);
981 kfree(sr_info);
982 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
983 release_mem_region(mem->start, resource_size(mem));
984
985 return 0;
986 }
987
988 static struct platform_driver smartreflex_driver = {
989 .remove = omap_sr_remove,
990 .driver = {
991 .name = "smartreflex",
992 },
993 };
994
995 static int __init sr_init(void)
996 {
997 int ret = 0;
998
999 /*
1000 * sr_init is a late init. If by then a pmic specific API is not
1001 * registered either there is no need for anything to be done on
1002 * the PMIC side or somebody has forgotten to register a PMIC
1003 * handler. Warn for the second condition.
1004 */
1005 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1006 sr_pmic_data->sr_pmic_init();
1007 else
1008 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1009
1010 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1011 if (ret) {
1012 pr_err("%s: platform driver register failed for SR\n",
1013 __func__);
1014 return ret;
1015 }
1016
1017 return 0;
1018 }
1019
1020 static void __exit sr_exit(void)
1021 {
1022 platform_driver_unregister(&smartreflex_driver);
1023 }
1024 late_initcall(sr_init);
1025 module_exit(sr_exit);
1026
1027 MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1028 MODULE_LICENSE("GPL");
1029 MODULE_ALIAS("platform:" DRIVER_NAME);
1030 MODULE_AUTHOR("Texas Instruments Inc");
kernel source for telekom puls (alcatel/mediatek)