projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ARM: OMAP3+: SmartReflex: Fix status masking in ERRCONFIG register
[deliverable/linux.git] / arch / arm / mach-omap2 / smartreflex.c
CommitLineData
984aa6db
TG		 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
a1bcc1dc 20#include <linux/module.h>
984aa6db
TG		 21#include <linux/interrupt.h>
22#include <linux/clk.h>
23#include <linux/io.h>
24#include <linux/debugfs.h>
25#include <linux/delay.h>
26#include <linux/slab.h>
27#include <linux/pm_runtime.h>
28
4e65331c 29#include "common.h"
984aa6db
TG		 30
31#include "pm.h"
7328ff4d 32#include "smartreflex.h"
984aa6db
TG		 33
34#define SMARTREFLEX_NAME_LEN 16
077fceca 35#define NVALUE_NAME_LEN 40
984aa6db
TG		 36#define SR_DISABLE_TIMEOUT 200
37
38struct omap_sr {
39 int srid;
40 int ip_type;
41 int nvalue_count;
42 bool autocomp_active;
43 u32 clk_length;
44 u32 err_weight;
45 u32 err_minlimit;
46 u32 err_maxlimit;
47 u32 accum_data;
48 u32 senn_avgweight;
49 u32 senp_avgweight;
50 u32 senp_mod;
51 u32 senn_mod;
52 unsigned int irq;
53 void __iomem *base;
54 struct platform_device *pdev;
55 struct list_head node;
56 struct omap_sr_nvalue_table *nvalue_table;
57 struct voltagedomain *voltdm;
b1ace380 58 struct dentry *dbg_dir;
984aa6db
TG		 59};
60
61/* sr_list contains all the instances of smartreflex module */
62static LIST_HEAD(sr_list);
63
64static struct omap_sr_class_data *sr_class;
65static struct omap_sr_pmic_data *sr_pmic_data;
633ef8b7 66static struct dentry *sr_dbg_dir;
984aa6db
TG		 67
68static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
69{
70 __raw_writel(value, (sr->base + offset));
71}
72
73static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,
74 u32 value)
75{
76 u32 reg_val;
984aa6db
TG		 77
78 /*
79 * Smartreflex error config register is special as it contains
80 * certain status bits which if written a 1 into means a clear
81 * of those bits. So in order to make sure no accidental write of
82 * 1 happens to those status bits, do a clear of them in the read
83 * value. This mean this API doesn't rewrite values in these bits
84 * if they are currently set, but does allow the caller to write
85 * those bits.
86 */
ade6ec05
NM		 87 if (sr->ip_type == SR_TYPE_V1 && offset == ERRCONFIG_V1)
88 mask |= ERRCONFIG_STATUS_V1_MASK;
89 else if (sr->ip_type == SR_TYPE_V2 && offset == ERRCONFIG_V2)
90 mask |= ERRCONFIG_VPBOUNDINTST_V2;
91
92 reg_val = __raw_readl(sr->base + offset);
93 reg_val &= ~mask;
984aa6db 94
ade6ec05 95 value &= mask;
984aa6db
TG		 96
97 reg_val |= value;
98
99 __raw_writel(reg_val, (sr->base + offset));
100}
101
102static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
103{
104 return __raw_readl(sr->base + offset);
105}
106
107static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm)
108{
109 struct omap_sr *sr_info;
110
111 if (!voltdm) {
112 pr_err("%s: Null voltage domain passed!\n", __func__);
113 return ERR_PTR(-EINVAL);
114 }
115
116 list_for_each_entry(sr_info, &sr_list, node) {
117 if (voltdm == sr_info->voltdm)
118 return sr_info;
119 }
120
121 return ERR_PTR(-ENODATA);
122}
123
124static irqreturn_t sr_interrupt(int irq, void *data)
125{
126 struct omap_sr *sr_info = (struct omap_sr *)data;
127 u32 status = 0;
128
129 if (sr_info->ip_type == SR_TYPE_V1) {
130 /* Read the status bits */
131 status = sr_read_reg(sr_info, ERRCONFIG_V1);
132
133 /* Clear them by writing back */
134 sr_write_reg(sr_info, ERRCONFIG_V1, status);
135 } else if (sr_info->ip_type == SR_TYPE_V2) {
136 /* Read the status bits */
5a4f1844 137 status = sr_read_reg(sr_info, IRQSTATUS);
984aa6db
TG		 138
139 /* Clear them by writing back */
140 sr_write_reg(sr_info, IRQSTATUS, status);
141 }
142
7a89afa8 143 if (sr_class->notify)
984aa6db
TG		 144 sr_class->notify(sr_info->voltdm, status);
145
146 return IRQ_HANDLED;
147}
148
149static void sr_set_clk_length(struct omap_sr *sr)
150{
151 struct clk *sys_ck;
152 u32 sys_clk_speed;
153
b35cecf9
TG		 154 if (cpu_is_omap34xx())
155 sys_ck = clk_get(NULL, "sys_ck");
156 else
157 sys_ck = clk_get(NULL, "sys_clkin_ck");
158
984aa6db
TG		 159 if (IS_ERR(sys_ck)) {
160 dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n",
161 __func__);
162 return;
163 }
164 sys_clk_speed = clk_get_rate(sys_ck);
165 clk_put(sys_ck);
166
167 switch (sys_clk_speed) {
168 case 12000000:
169 sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK;
170 break;
171 case 13000000:
172 sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK;
173 break;
174 case 19200000:
175 sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK;
176 break;
177 case 26000000:
178 sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK;
179 break;
180 case 38400000:
181 sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK;
182 break;
183 default:
184 dev_err(&sr->pdev->dev, "%s: Invalid sysclk value: %d\n",
185 __func__, sys_clk_speed);
186 break;
187 }
188}
189
190static void sr_set_regfields(struct omap_sr *sr)
191{
192 /*
193 * For time being these values are defined in smartreflex.h
194 * and populated during init. May be they can be moved to board
195 * file or pmic specific data structure. In that case these structure
196 * fields will have to be populated using the pdata or pmic structure.
197 */
b35cecf9 198 if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
984aa6db
TG		 199 sr->err_weight = OMAP3430_SR_ERRWEIGHT;
200 sr->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
201 sr->accum_data = OMAP3430_SR_ACCUMDATA;
202 if (!(strcmp(sr->voltdm->name, "mpu"))) {
203 sr->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
204 sr->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
205 } else {
206 sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
207 sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
208 }
209 }
210}
211
212static void sr_start_vddautocomp(struct omap_sr *sr)
213{
214 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
215 dev_warn(&sr->pdev->dev,
216 "%s: smartreflex class driver not registered\n",
217 __func__);
218 return;
219 }
220
221 if (!sr_class->enable(sr->voltdm))
222 sr->autocomp_active = true;
223}
224
225static void sr_stop_vddautocomp(struct omap_sr *sr)
226{
227 if (!sr_class || !(sr_class->disable)) {
228 dev_warn(&sr->pdev->dev,
229 "%s: smartreflex class driver not registered\n",
230 __func__);
231 return;
232 }
233
234 if (sr->autocomp_active) {
235 sr_class->disable(sr->voltdm, 1);
236 sr->autocomp_active = false;
237 }
238}
239
240/*
241 * This function handles the intializations which have to be done
242 * only when both sr device and class driver regiter has
243 * completed. This will be attempted to be called from both sr class
244 * driver register and sr device intializtion API's. Only one call
245 * will ultimately succeed.
246 *
fb914ebf 247 * Currently this function registers interrupt handler for a particular SR
984aa6db
TG		 248 * if smartreflex class driver is already registered and has
249 * requested for interrupts and the SR interrupt line in present.
250 */
251static int sr_late_init(struct omap_sr *sr_info)
252{
253 char *name;
254 struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data;
255 struct resource *mem;
256 int ret = 0;
257
7a89afa8 258 if (sr_class->notify && sr_class->notify_flags && sr_info->irq) {
5c56f32e
VK		 259 name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
260 if (name == NULL) {
261 ret = -ENOMEM;
262 goto error;
263 }
984aa6db
TG		 264 ret = request_irq(sr_info->irq, sr_interrupt,
265 0, name, (void *)sr_info);
266 if (ret)
267 goto error;
1279ba59 268 disable_irq(sr_info->irq);
984aa6db
TG		 269 }
270
271 if (pdata && pdata->enable_on_init)
272 sr_start_vddautocomp(sr_info);
273
274 return ret;
275
276error:
442155ad
NM		 277 iounmap(sr_info->base);
278 mem = platform_get_resource(sr_info->pdev, IORESOURCE_MEM, 0);
279 release_mem_region(mem->start, resource_size(mem));
280 list_del(&sr_info->node);
281 dev_err(&sr_info->pdev->dev, "%s: ERROR in registering"
282 "interrupt handler. Smartreflex will"
283 "not function as desired\n", __func__);
284 kfree(name);
285 kfree(sr_info);
286 return ret;
984aa6db
TG		 287}
288
289static void sr_v1_disable(struct omap_sr *sr)
290{
291 int timeout = 0;
292
293 /* Enable MCUDisableAcknowledge interrupt */
294 sr_modify_reg(sr, ERRCONFIG_V1,
295 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
296
297 /* SRCONFIG - disable SR */
298 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
299
300 /* Disable all other SR interrupts and clear the status */
301 sr_modify_reg(sr, ERRCONFIG_V1,
302 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
303 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),
304 (ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
305 ERRCONFIG_MCUBOUNDINTST |
306 ERRCONFIG_VPBOUNDINTST_V1));
307
308 /*
309 * Wait for SR to be disabled.
310 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
311 */
312 omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
313 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
314 timeout);
315
316 if (timeout >= SR_DISABLE_TIMEOUT)
317 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
318 __func__);
319
320 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
321 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
322 ERRCONFIG_MCUDISACKINTST);
323}
324
325static void sr_v2_disable(struct omap_sr *sr)
326{
327 int timeout = 0;
328
329 /* Enable MCUDisableAcknowledge interrupt */
330 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
331
332 /* SRCONFIG - disable SR */
333 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
334
335 /* Disable all other SR interrupts and clear the status */
336 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
337 ERRCONFIG_VPBOUNDINTST_V2);
338 sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |
339 IRQENABLE_MCUVALIDINT |
340 IRQENABLE_MCUBOUNDSINT));
341 sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |
342 IRQSTATUS_MCVALIDINT |
343 IRQSTATUS_MCBOUNDSINT));
344
345 /*
346 * Wait for SR to be disabled.
347 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
348 */
349 omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
350 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
351 timeout);
352
353 if (timeout >= SR_DISABLE_TIMEOUT)
354 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
355 __func__);
356
357 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
358 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
359 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
360}
361
362static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs)
363{
364 int i;
365
366 if (!sr->nvalue_table) {
367 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
368 __func__);
369 return 0;
370 }
371
372 for (i = 0; i < sr->nvalue_count; i++) {
373 if (sr->nvalue_table[i].efuse_offs == efuse_offs)
374 return sr->nvalue_table[i].nvalue;
375 }
376
377 return 0;
378}
379
380/* Public Functions */
381
382/**
383 * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
384 * error generator module.
385 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
386 *
387 * This API is to be called from the smartreflex class driver to
388 * configure the error generator module inside the smartreflex module.
389 * SR settings if using the ERROR module inside Smartreflex.
390 * SR CLASS 3 by default uses only the ERROR module where as
391 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
392 * module. Returns 0 on success and error value in case of failure.
393 */
394int sr_configure_errgen(struct voltagedomain *voltdm)
395{
396 u32 sr_config, sr_errconfig, errconfig_offs, vpboundint_en;
397 u32 vpboundint_st, senp_en = 0, senn_en = 0;
398 u8 senp_shift, senn_shift;
399 struct omap_sr *sr = _sr_lookup(voltdm);
400
401 if (IS_ERR(sr)) {
402 pr_warning("%s: omap_sr struct for sr_%s not found\n",
403 __func__, voltdm->name);
404 return -EINVAL;
405 }
406
407 if (!sr->clk_length)
408 sr_set_clk_length(sr);
409
410 senp_en = sr->senp_mod;
411 senn_en = sr->senn_mod;
412
413 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
414 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
415
416 if (sr->ip_type == SR_TYPE_V1) {
417 sr_config |= SRCONFIG_DELAYCTRL;
418 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
419 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
420 errconfig_offs = ERRCONFIG_V1;
421 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
422 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
423 } else if (sr->ip_type == SR_TYPE_V2) {
424 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
425 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
426 errconfig_offs = ERRCONFIG_V2;
427 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
428 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
429 } else {
430 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
431 "module without specifying the ip\n", __func__);
432 return -EINVAL;
433 }
434
435 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
436 sr_write_reg(sr, SRCONFIG, sr_config);
437 sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |
438 (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |
439 (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);
440 sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |
441 SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),
442 sr_errconfig);
443
444 /* Enabling the interrupts if the ERROR module is used */
74754cc5
NM		 445 sr_modify_reg(sr, errconfig_offs, (vpboundint_en | vpboundint_st),
446 vpboundint_en);
984aa6db
TG		 447
448 return 0;
449}
450
ad54c3dd
NM		 451/**
452 * sr_disable_errgen() - Disables SmartReflex AVS module's errgen component
453 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
454 *
455 * This API is to be called from the smartreflex class driver to
456 * disable the error generator module inside the smartreflex module.
457 *
458 * Returns 0 on success and error value in case of failure.
459 */
460int sr_disable_errgen(struct voltagedomain *voltdm)
461{
462 u32 errconfig_offs, vpboundint_en;
463 u32 vpboundint_st;
464 struct omap_sr *sr = _sr_lookup(voltdm);
465
466 if (IS_ERR(sr)) {
467 pr_warning("%s: omap_sr struct for sr_%s not found\n",
468 __func__, voltdm->name);
469 return -EINVAL;
470 }
471
472 if (sr->ip_type == SR_TYPE_V1) {
473 errconfig_offs = ERRCONFIG_V1;
474 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
475 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
476 } else if (sr->ip_type == SR_TYPE_V2) {
477 errconfig_offs = ERRCONFIG_V2;
478 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
479 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
480 } else {
481 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
482 "module without specifying the ip\n", __func__);
483 return -EINVAL;
484 }
485
486 /* Disable the interrupts of ERROR module */
487 sr_modify_reg(sr, errconfig_offs, vpboundint_en | vpboundint_st, 0);
488
489 /* Disable the Sensor and errorgen */
490 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN, 0);
491
492 return 0;
493}
494
984aa6db
TG		 495/**
496 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
497 * minmaxavg module.
498 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
499 *
500 * This API is to be called from the smartreflex class driver to
501 * configure the minmaxavg module inside the smartreflex module.
502 * SR settings if using the ERROR module inside Smartreflex.
503 * SR CLASS 3 by default uses only the ERROR module where as
504 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
505 * module. Returns 0 on success and error value in case of failure.
506 */
507int sr_configure_minmax(struct voltagedomain *voltdm)
508{
509 u32 sr_config, sr_avgwt;
510 u32 senp_en = 0, senn_en = 0;
511 u8 senp_shift, senn_shift;
512 struct omap_sr *sr = _sr_lookup(voltdm);
513
514 if (IS_ERR(sr)) {
515 pr_warning("%s: omap_sr struct for sr_%s not found\n",
516 __func__, voltdm->name);
517 return -EINVAL;
518 }
519
520 if (!sr->clk_length)
521 sr_set_clk_length(sr);
522
523 senp_en = sr->senp_mod;
524 senn_en = sr->senn_mod;
525
526 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
527 SRCONFIG_SENENABLE |
528 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
529
530 if (sr->ip_type == SR_TYPE_V1) {
531 sr_config |= SRCONFIG_DELAYCTRL;
532 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
533 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
534 } else if (sr->ip_type == SR_TYPE_V2) {
535 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
536 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
537 } else {
538 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
539 "module without specifying the ip\n", __func__);
540 return -EINVAL;
541 }
542
543 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
544 sr_write_reg(sr, SRCONFIG, sr_config);
545 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
546 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
547 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
548
549 /*
550 * Enabling the interrupts if MINMAXAVG module is used.
551 * TODO: check if all the interrupts are mandatory
552 */
553 if (sr->ip_type == SR_TYPE_V1) {
554 sr_modify_reg(sr, ERRCONFIG_V1,
555 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
556 ERRCONFIG_MCUBOUNDINTEN),
557 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
558 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
559 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
560 } else if (sr->ip_type == SR_TYPE_V2) {
561 sr_write_reg(sr, IRQSTATUS,
562 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
563 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
564 sr_write_reg(sr, IRQENABLE_SET,
565 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
566 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
567 }
568
569 return 0;
570}
571
572/**
573 * sr_enable() - Enables the smartreflex module.
574 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
575 * @volt: The voltage at which the Voltage domain associated with
576 * the smartreflex module is operating at.
577 * This is required only to program the correct Ntarget value.
578 *
579 * This API is to be called from the smartreflex class driver to
580 * enable a smartreflex module. Returns 0 on success. Returns error
581 * value if the voltage passed is wrong or if ntarget value is wrong.
582 */
583int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
584{
585 u32 nvalue_reciprocal;
586 struct omap_volt_data *volt_data;
587 struct omap_sr *sr = _sr_lookup(voltdm);
588 int ret;
589
590 if (IS_ERR(sr)) {
591 pr_warning("%s: omap_sr struct for sr_%s not found\n",
592 __func__, voltdm->name);
593 return -EINVAL;
594 }
595
596 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
597
598 if (IS_ERR(volt_data)) {
599 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
600 "for nominal voltage %ld\n", __func__, volt);
601 return -ENODATA;
602 }
603
604 nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
605
606 if (!nvalue_reciprocal) {
607 dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
608 __func__, volt);
609 return -ENODATA;
610 }
611
612 /* errminlimit is opp dependent and hence linked to voltage */
613 sr->err_minlimit = volt_data->sr_errminlimit;
614
615 pm_runtime_get_sync(&sr->pdev->dev);
616
617 /* Check if SR is already enabled. If yes do nothing */
618 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
619 return 0;
620
621 /* Configure SR */
622 ret = sr_class->configure(voltdm);
623 if (ret)
624 return ret;
625
626 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
627
628 /* SRCONFIG - enable SR */
629 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
630 return 0;
631}
632
633/**
634 * sr_disable() - Disables the smartreflex module.
635 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
636 *
637 * This API is to be called from the smartreflex class driver to
638 * disable a smartreflex module.
639 */
640void sr_disable(struct voltagedomain *voltdm)
641{
642 struct omap_sr *sr = _sr_lookup(voltdm);
643
644 if (IS_ERR(sr)) {
645 pr_warning("%s: omap_sr struct for sr_%s not found\n",
646 __func__, voltdm->name);
647 return;
648 }
649
650 /* Check if SR clocks are already disabled. If yes do nothing */
651 if (pm_runtime_suspended(&sr->pdev->dev))
652 return;
653
654 /*
655 * Disable SR if only it is indeed enabled. Else just
656 * disable the clocks.
657 */
658 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
659 if (sr->ip_type == SR_TYPE_V1)
660 sr_v1_disable(sr);
661 else if (sr->ip_type == SR_TYPE_V2)
662 sr_v2_disable(sr);
663 }
664
98333b3d 665 pm_runtime_put_sync_suspend(&sr->pdev->dev);
984aa6db
TG		 666}
667
668/**
669 * sr_register_class() - API to register a smartreflex class parameters.
670 * @class_data: The structure containing various sr class specific data.
671 *
672 * This API is to be called by the smartreflex class driver to register itself
673 * with the smartreflex driver during init. Returns 0 on success else the
674 * error value.
675 */
676int sr_register_class(struct omap_sr_class_data *class_data)
677{
678 struct omap_sr *sr_info;
679
680 if (!class_data) {
681 pr_warning("%s:, Smartreflex class data passed is NULL\n",
682 __func__);
683 return -EINVAL;
684 }
685
686 if (sr_class) {
687 pr_warning("%s: Smartreflex class driver already registered\n",
688 __func__);
689 return -EBUSY;
690 }
691
692 sr_class = class_data;
693
694 /*
695 * Call into late init to do intializations that require
696 * both sr driver and sr class driver to be initiallized.
697 */
698 list_for_each_entry(sr_info, &sr_list, node)
699 sr_late_init(sr_info);
700
701 return 0;
702}
703
704/**
705 * omap_sr_enable() - API to enable SR clocks and to call into the
706 * registered smartreflex class enable API.
707 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
708 *
709 * This API is to be called from the kernel in order to enable
710 * a particular smartreflex module. This API will do the initial
711 * configurations to turn on the smartreflex module and in turn call
712 * into the registered smartreflex class enable API.
713 */
714void omap_sr_enable(struct voltagedomain *voltdm)
715{
716 struct omap_sr *sr = _sr_lookup(voltdm);
717
718 if (IS_ERR(sr)) {
719 pr_warning("%s: omap_sr struct for sr_%s not found\n",
720 __func__, voltdm->name);
721 return;
722 }
723
724 if (!sr->autocomp_active)
725 return;
726
727 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
728 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
729 "registered\n", __func__);
730 return;
731 }
732
733 sr_class->enable(voltdm);
734}
735
736/**
737 * omap_sr_disable() - API to disable SR without resetting the voltage
738 * processor voltage
739 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
740 *
741 * This API is to be called from the kernel in order to disable
742 * a particular smartreflex module. This API will in turn call
743 * into the registered smartreflex class disable API. This API will tell
744 * the smartreflex class disable not to reset the VP voltage after
745 * disabling smartreflex.
746 */
747void omap_sr_disable(struct voltagedomain *voltdm)
748{
749 struct omap_sr *sr = _sr_lookup(voltdm);
750
751 if (IS_ERR(sr)) {
752 pr_warning("%s: omap_sr struct for sr_%s not found\n",
753 __func__, voltdm->name);
754 return;
755 }
756
757 if (!sr->autocomp_active)
758 return;
759
760 if (!sr_class || !(sr_class->disable)) {
761 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
762 "registered\n", __func__);
763 return;
764 }
765
766 sr_class->disable(voltdm, 0);
767}
768
769/**
770 * omap_sr_disable_reset_volt() - API to disable SR and reset the
771 * voltage processor voltage
772 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
773 *
774 * This API is to be called from the kernel in order to disable
775 * a particular smartreflex module. This API will in turn call
776 * into the registered smartreflex class disable API. This API will tell
777 * the smartreflex class disable to reset the VP voltage after
778 * disabling smartreflex.
779 */
780void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
781{
782 struct omap_sr *sr = _sr_lookup(voltdm);
783
784 if (IS_ERR(sr)) {
785 pr_warning("%s: omap_sr struct for sr_%s not found\n",
786 __func__, voltdm->name);
787 return;
788 }
789
790 if (!sr->autocomp_active)
791 return;
792
793 if (!sr_class || !(sr_class->disable)) {
794 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
795 "registered\n", __func__);
796 return;
797 }
798
799 sr_class->disable(voltdm, 1);
800}
801
802/**
803 * omap_sr_register_pmic() - API to register pmic specific info.
804 * @pmic_data: The structure containing pmic specific data.
805 *
806 * This API is to be called from the PMIC specific code to register with
807 * smartreflex driver pmic specific info. Currently the only info required
808 * is the smartreflex init on the PMIC side.
809 */
810void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
811{
812 if (!pmic_data) {
813 pr_warning("%s: Trying to register NULL PMIC data structure"
814 "with smartreflex\n", __func__);
815 return;
816 }
817
818 sr_pmic_data = pmic_data;
819}
820
821/* PM Debug Fs enteries to enable disable smartreflex. */
822static int omap_sr_autocomp_show(void *data, u64 *val)
823{
824 struct omap_sr *sr_info = (struct omap_sr *) data;
825
826 if (!sr_info) {
8353584e 827 pr_warning("%s: omap_sr struct not found\n", __func__);
984aa6db
TG		 828 return -EINVAL;
829 }
830
831 *val = sr_info->autocomp_active;
832
833 return 0;
834}
835
836static int omap_sr_autocomp_store(void *data, u64 val)
837{
838 struct omap_sr *sr_info = (struct omap_sr *) data;
839
840 if (!sr_info) {
8353584e 841 pr_warning("%s: omap_sr struct not found\n", __func__);
984aa6db
TG		 842 return -EINVAL;
843 }
844
845 /* Sanity check */
846 if (val && (val != 1)) {
847 pr_warning("%s: Invalid argument %lld\n", __func__, val);
848 return -EINVAL;
849 }
850
ac77a6f7
NM		 851 /* control enable/disable only if there is a delta in value */
852 if (sr_info->autocomp_active != val) {
853 if (!val)
854 sr_stop_vddautocomp(sr_info);
855 else
856 sr_start_vddautocomp(sr_info);
857 }
984aa6db
TG		 858
859 return 0;
860}
861
862DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
863 omap_sr_autocomp_store, "%llu\n");
864
865static int __init omap_sr_probe(struct platform_device *pdev)
866{
867 struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
868 struct omap_sr_data *pdata = pdev->dev.platform_data;
869 struct resource *mem, *irq;
633ef8b7 870 struct dentry *nvalue_dir;
077fceca
TG		 871 struct omap_volt_data *volt_data;
872 int i, ret = 0;
633ef8b7 873 char *name;
984aa6db
TG		 874
875 if (!sr_info) {
876 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
877 __func__);
878 return -ENOMEM;
879 }
880
881 if (!pdata) {
882 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
720bc782
SW		 883 ret = -EINVAL;
884 goto err_free_devinfo;
984aa6db
TG		 885 }
886
887 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
888 if (!mem) {
889 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
890 ret = -ENODEV;
891 goto err_free_devinfo;
892 }
893
da9e7392
AK		 894 mem = request_mem_region(mem->start, resource_size(mem),
895 dev_name(&pdev->dev));
896 if (!mem) {
897 dev_err(&pdev->dev, "%s: no mem region\n", __func__);
898 ret = -EBUSY;
899 goto err_free_devinfo;
900 }
901
984aa6db
TG		 902 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
903
904 pm_runtime_enable(&pdev->dev);
e13d8f38 905 pm_runtime_irq_safe(&pdev->dev);
984aa6db
TG		 906
907 sr_info->pdev = pdev;
908 sr_info->srid = pdev->id;
909 sr_info->voltdm = pdata->voltdm;
910 sr_info->nvalue_table = pdata->nvalue_table;
911 sr_info->nvalue_count = pdata->nvalue_count;
912 sr_info->senn_mod = pdata->senn_mod;
913 sr_info->senp_mod = pdata->senp_mod;
914 sr_info->autocomp_active = false;
915 sr_info->ip_type = pdata->ip_type;
916 sr_info->base = ioremap(mem->start, resource_size(mem));
917 if (!sr_info->base) {
918 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
919 ret = -ENOMEM;
920 goto err_release_region;
921 }
922
923 if (irq)
924 sr_info->irq = irq->start;
925
926 sr_set_clk_length(sr_info);
927 sr_set_regfields(sr_info);
928
929 list_add(&sr_info->node, &sr_list);
930
931 /*
932 * Call into late init to do intializations that require
933 * both sr driver and sr class driver to be initiallized.
934 */
935 if (sr_class) {
936 ret = sr_late_init(sr_info);
937 if (ret) {
938 pr_warning("%s: Error in SR late init\n", __func__);
14ea9601 939 goto err_iounmap;
984aa6db
TG		 940 }
941 }
942
943 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
633ef8b7
KH		 944 if (!sr_dbg_dir) {
945 sr_dbg_dir = debugfs_create_dir("smartreflex", NULL);
946 if (!sr_dbg_dir) {
947 ret = PTR_ERR(sr_dbg_dir);
948 pr_err("%s:sr debugfs dir creation failed(%d)\n",
949 __func__, ret);
950 goto err_iounmap;
951 }
952 }
984aa6db 953
633ef8b7
KH		 954 name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
955 if (!name) {
956 dev_err(&pdev->dev, "%s: Unable to alloc debugfs name\n",
957 __func__);
958 ret = -ENOMEM;
0c49cc16 959 goto err_iounmap;
b3329a33 960 }
633ef8b7
KH		 961 sr_info->dbg_dir = debugfs_create_dir(name, sr_dbg_dir);
962 kfree(name);
b1ace380 963 if (IS_ERR(sr_info->dbg_dir)) {
984aa6db
TG		 964 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
965 __func__);
b1ace380 966 ret = PTR_ERR(sr_info->dbg_dir);
0c49cc16 967 goto err_iounmap;
984aa6db
TG		 968 }
969
b1ace380
AS		 970 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR,
971 sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops);
972 (void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir,
077fceca 973 &sr_info->err_weight);
b1ace380 974 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir,
077fceca 975 &sr_info->err_maxlimit);
b1ace380 976 (void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir,
077fceca
TG		 977 &sr_info->err_minlimit);
978
b1ace380 979 nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir);
077fceca
TG		 980 if (IS_ERR(nvalue_dir)) {
981 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
982 "for n-values\n", __func__);
b3329a33 983 ret = PTR_ERR(nvalue_dir);
283a1c1f 984 goto err_debugfs;
077fceca
TG		 985 }
986
987 omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
988 if (!volt_data) {
989 dev_warn(&pdev->dev, "%s: No Voltage table for the"
990 " corresponding vdd vdd_%s. Cannot create debugfs"
991 "entries for n-values\n",
992 __func__, sr_info->voltdm->name);
b3329a33 993 ret = -ENODATA;
283a1c1f 994 goto err_debugfs;
077fceca
TG		 995 }
996
997 for (i = 0; i < sr_info->nvalue_count; i++) {
865212ab 998 char name[NVALUE_NAME_LEN + 1];
077fceca 999
865212ab
AK		 1000 snprintf(name, sizeof(name), "volt_%d",
1001 volt_data[i].volt_nominal);
1232a185 1002 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
077fceca
TG		 1003 &(sr_info->nvalue_table[i].nvalue));
1004 }
984aa6db
TG		 1005
1006 return ret;
1007
283a1c1f
AK		 1008err_debugfs:
1009 debugfs_remove_recursive(sr_info->dbg_dir);
0c49cc16 1010err_iounmap:
833d78fc 1011 list_del(&sr_info->node);
0c49cc16 1012 iounmap(sr_info->base);
984aa6db
TG		 1013err_release_region:
1014 release_mem_region(mem->start, resource_size(mem));
1015err_free_devinfo:
1016 kfree(sr_info);
1017
1018 return ret;
1019}
1020
1021static int __devexit omap_sr_remove(struct platform_device *pdev)
1022{
1023 struct omap_sr_data *pdata = pdev->dev.platform_data;
1024 struct omap_sr *sr_info;
1025 struct resource *mem;
1026
1027 if (!pdata) {
1028 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
1029 return -EINVAL;
1030 }
1031
1032 sr_info = _sr_lookup(pdata->voltdm);
28693ec0 1033 if (IS_ERR(sr_info)) {
984aa6db
TG		 1034 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
1035 __func__);
1036 return -EINVAL;
1037 }
1038
1039 if (sr_info->autocomp_active)
1040 sr_stop_vddautocomp(sr_info);
b1ace380
AS		 1041 if (sr_info->dbg_dir)
1042 debugfs_remove_recursive(sr_info->dbg_dir);
984aa6db
TG		 1043
1044 list_del(&sr_info->node);
1045 iounmap(sr_info->base);
1046 kfree(sr_info);
1047 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1048 release_mem_region(mem->start, resource_size(mem));
1049
1050 return 0;
1051}
1052
1f55bc18
NM		 1053static void __devexit omap_sr_shutdown(struct platform_device *pdev)
1054{
1055 struct omap_sr_data *pdata = pdev->dev.platform_data;
1056 struct omap_sr *sr_info;
1057
1058 if (!pdata) {
1059 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
1060 return;
1061 }
1062
1063 sr_info = _sr_lookup(pdata->voltdm);
1064 if (IS_ERR(sr_info)) {
1065 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
1066 __func__);
1067 return;
1068 }
1069
1070 if (sr_info->autocomp_active)
1071 sr_stop_vddautocomp(sr_info);
1072
1073 return;
1074}
1075
984aa6db 1076static struct platform_driver smartreflex_driver = {
149f1d5c 1077 .remove = __devexit_p(omap_sr_remove),
1f55bc18 1078 .shutdown = __devexit_p(omap_sr_shutdown),
984aa6db
TG		 1079 .driver = {
1080 .name = "smartreflex",
1081 },
1082};
1083
1084static int __init sr_init(void)
1085{
1086 int ret = 0;
1087
1088 /*
1089 * sr_init is a late init. If by then a pmic specific API is not
1090 * registered either there is no need for anything to be done on
1091 * the PMIC side or somebody has forgotten to register a PMIC
1092 * handler. Warn for the second condition.
1093 */
1094 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1095 sr_pmic_data->sr_pmic_init();
1096 else
1097 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1098
1099 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1100 if (ret) {
1101 pr_err("%s: platform driver register failed for SR\n",
1102 __func__);
1103 return ret;
1104 }
1105
1106 return 0;
1107}
1108
1109static void __exit sr_exit(void)
1110{
1111 platform_driver_unregister(&smartreflex_driver);
1112}
1113late_initcall(sr_init);
1114module_exit(sr_exit);
1115
1116MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1117MODULE_LICENSE("GPL");
1118MODULE_ALIAS("platform:" DRIVER_NAME);
1119MODULE_AUTHOR("Texas Instruments Inc");
Linux kernel - Deliverables
This page took 0.214142 seconds and 5 git commands to generate.