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ARM: OMAP3+: SmartReflex: move late_initcall() closer to its argument
[deliverable/linux.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/module.h>
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
29 #include "common.h"
30
31 #include "pm.h"
32 #include "smartreflex.h"
33
34 #define SMARTREFLEX_NAME_LEN 16
35 #define NVALUE_NAME_LEN 40
36 #define SR_DISABLE_TIMEOUT 200
37
38 struct 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;
58 struct dentry *dbg_dir;
59 };
60
61 /* sr_list contains all the instances of smartreflex module */
62 static LIST_HEAD(sr_list);
63
64 static struct omap_sr_class_data *sr_class;
65 static struct omap_sr_pmic_data *sr_pmic_data;
66 static struct dentry *sr_dbg_dir;
67
68 static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
69 {
70 __raw_writel(value, (sr->base + offset));
71 }
72
73 static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,
74 u32 value)
75 {
76 u32 reg_val;
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 */
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;
94
95 value &= mask;
96
97 reg_val |= value;
98
99 __raw_writel(reg_val, (sr->base + offset));
100 }
101
102 static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
103 {
104 return __raw_readl(sr->base + offset);
105 }
106
107 static 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
124 static 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 */
137 status = sr_read_reg(sr_info, IRQSTATUS);
138
139 /* Clear them by writing back */
140 sr_write_reg(sr_info, IRQSTATUS, status);
141 }
142
143 if (sr_class->notify)
144 sr_class->notify(sr_info->voltdm, status);
145
146 return IRQ_HANDLED;
147 }
148
149 static void sr_set_clk_length(struct omap_sr *sr)
150 {
151 struct clk *sys_ck;
152 u32 sys_clk_speed;
153
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
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
190 static 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 */
198 if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
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
212 static 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
225 static 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 *
247 * Currently this function registers interrupt handler for a particular SR
248 * if smartreflex class driver is already registered and has
249 * requested for interrupts and the SR interrupt line in present.
250 */
251 static 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
258 if (sr_class->notify && sr_class->notify_flags && sr_info->irq) {
259 name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
260 if (name == NULL) {
261 ret = -ENOMEM;
262 goto error;
263 }
264 ret = request_irq(sr_info->irq, sr_interrupt,
265 0, name, (void *)sr_info);
266 if (ret)
267 goto error;
268 disable_irq(sr_info->irq);
269 }
270
271 if (pdata && pdata->enable_on_init)
272 sr_start_vddautocomp(sr_info);
273
274 return ret;
275
276 error:
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;
287 }
288
289 static void sr_v1_disable(struct omap_sr *sr)
290 {
291 int timeout = 0;
292 int errconf_val = ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
293 ERRCONFIG_MCUBOUNDINTST;
294
295 /* Enable MCUDisableAcknowledge interrupt */
296 sr_modify_reg(sr, ERRCONFIG_V1,
297 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
298
299 /* SRCONFIG - disable SR */
300 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
301
302 /* Disable all other SR interrupts and clear the status as needed */
303 if (sr_read_reg(sr, ERRCONFIG_V1) & ERRCONFIG_VPBOUNDINTST_V1)
304 errconf_val |= ERRCONFIG_VPBOUNDINTST_V1;
305 sr_modify_reg(sr, ERRCONFIG_V1,
306 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
307 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),
308 errconf_val);
309
310 /*
311 * Wait for SR to be disabled.
312 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
313 */
314 omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
315 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
316 timeout);
317
318 if (timeout >= SR_DISABLE_TIMEOUT)
319 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
320 __func__);
321
322 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
323 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
324 ERRCONFIG_MCUDISACKINTST);
325 }
326
327 static void sr_v2_disable(struct omap_sr *sr)
328 {
329 int timeout = 0;
330
331 /* Enable MCUDisableAcknowledge interrupt */
332 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
333
334 /* SRCONFIG - disable SR */
335 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
336
337 /*
338 * Disable all other SR interrupts and clear the status
339 * write to status register ONLY on need basis - only if status
340 * is set.
341 */
342 if (sr_read_reg(sr, ERRCONFIG_V2) & ERRCONFIG_VPBOUNDINTST_V2)
343 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
344 ERRCONFIG_VPBOUNDINTST_V2);
345 else
346 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
347 0x0);
348 sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |
349 IRQENABLE_MCUVALIDINT |
350 IRQENABLE_MCUBOUNDSINT));
351 sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |
352 IRQSTATUS_MCVALIDINT |
353 IRQSTATUS_MCBOUNDSINT));
354
355 /*
356 * Wait for SR to be disabled.
357 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
358 */
359 omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
360 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
361 timeout);
362
363 if (timeout >= SR_DISABLE_TIMEOUT)
364 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
365 __func__);
366
367 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
368 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
369 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
370 }
371
372 static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs)
373 {
374 int i;
375
376 if (!sr->nvalue_table) {
377 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
378 __func__);
379 return 0;
380 }
381
382 for (i = 0; i < sr->nvalue_count; i++) {
383 if (sr->nvalue_table[i].efuse_offs == efuse_offs)
384 return sr->nvalue_table[i].nvalue;
385 }
386
387 return 0;
388 }
389
390 /* Public Functions */
391
392 /**
393 * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
394 * error generator module.
395 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
396 *
397 * This API is to be called from the smartreflex class driver to
398 * configure the error generator module inside the smartreflex module.
399 * SR settings if using the ERROR module inside Smartreflex.
400 * SR CLASS 3 by default uses only the ERROR module where as
401 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
402 * module. Returns 0 on success and error value in case of failure.
403 */
404 int sr_configure_errgen(struct voltagedomain *voltdm)
405 {
406 u32 sr_config, sr_errconfig, errconfig_offs, vpboundint_en;
407 u32 vpboundint_st, senp_en = 0, senn_en = 0;
408 u8 senp_shift, senn_shift;
409 struct omap_sr *sr = _sr_lookup(voltdm);
410
411 if (IS_ERR(sr)) {
412 pr_warning("%s: omap_sr struct for sr_%s not found\n",
413 __func__, voltdm->name);
414 return -EINVAL;
415 }
416
417 if (!sr->clk_length)
418 sr_set_clk_length(sr);
419
420 senp_en = sr->senp_mod;
421 senn_en = sr->senn_mod;
422
423 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
424 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
425
426 if (sr->ip_type == SR_TYPE_V1) {
427 sr_config |= SRCONFIG_DELAYCTRL;
428 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
429 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
430 errconfig_offs = ERRCONFIG_V1;
431 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
432 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
433 } else if (sr->ip_type == SR_TYPE_V2) {
434 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
435 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
436 errconfig_offs = ERRCONFIG_V2;
437 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
438 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
439 } else {
440 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
441 "module without specifying the ip\n", __func__);
442 return -EINVAL;
443 }
444
445 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
446 sr_write_reg(sr, SRCONFIG, sr_config);
447 sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |
448 (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |
449 (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);
450 sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |
451 SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),
452 sr_errconfig);
453
454 /* Enabling the interrupts if the ERROR module is used */
455 sr_modify_reg(sr, errconfig_offs, (vpboundint_en | vpboundint_st),
456 vpboundint_en);
457
458 return 0;
459 }
460
461 /**
462 * sr_disable_errgen() - Disables SmartReflex AVS module's errgen component
463 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
464 *
465 * This API is to be called from the smartreflex class driver to
466 * disable the error generator module inside the smartreflex module.
467 *
468 * Returns 0 on success and error value in case of failure.
469 */
470 int sr_disable_errgen(struct voltagedomain *voltdm)
471 {
472 u32 errconfig_offs, vpboundint_en;
473 u32 vpboundint_st;
474 struct omap_sr *sr = _sr_lookup(voltdm);
475
476 if (IS_ERR(sr)) {
477 pr_warning("%s: omap_sr struct for sr_%s not found\n",
478 __func__, voltdm->name);
479 return -EINVAL;
480 }
481
482 if (sr->ip_type == SR_TYPE_V1) {
483 errconfig_offs = ERRCONFIG_V1;
484 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
485 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
486 } else if (sr->ip_type == SR_TYPE_V2) {
487 errconfig_offs = ERRCONFIG_V2;
488 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
489 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
490 } else {
491 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
492 "module without specifying the ip\n", __func__);
493 return -EINVAL;
494 }
495
496 /* Disable the interrupts of ERROR module */
497 sr_modify_reg(sr, errconfig_offs, vpboundint_en | vpboundint_st, 0);
498
499 /* Disable the Sensor and errorgen */
500 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN, 0);
501
502 return 0;
503 }
504
505 /**
506 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
507 * minmaxavg module.
508 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
509 *
510 * This API is to be called from the smartreflex class driver to
511 * configure the minmaxavg module inside the smartreflex module.
512 * SR settings if using the ERROR module inside Smartreflex.
513 * SR CLASS 3 by default uses only the ERROR module where as
514 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
515 * module. Returns 0 on success and error value in case of failure.
516 */
517 int sr_configure_minmax(struct voltagedomain *voltdm)
518 {
519 u32 sr_config, sr_avgwt;
520 u32 senp_en = 0, senn_en = 0;
521 u8 senp_shift, senn_shift;
522 struct omap_sr *sr = _sr_lookup(voltdm);
523
524 if (IS_ERR(sr)) {
525 pr_warning("%s: omap_sr struct for sr_%s not found\n",
526 __func__, voltdm->name);
527 return -EINVAL;
528 }
529
530 if (!sr->clk_length)
531 sr_set_clk_length(sr);
532
533 senp_en = sr->senp_mod;
534 senn_en = sr->senn_mod;
535
536 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
537 SRCONFIG_SENENABLE |
538 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
539
540 if (sr->ip_type == SR_TYPE_V1) {
541 sr_config |= SRCONFIG_DELAYCTRL;
542 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
543 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
544 } else if (sr->ip_type == SR_TYPE_V2) {
545 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
546 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
547 } else {
548 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
549 "module without specifying the ip\n", __func__);
550 return -EINVAL;
551 }
552
553 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
554 sr_write_reg(sr, SRCONFIG, sr_config);
555 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
556 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
557 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
558
559 /*
560 * Enabling the interrupts if MINMAXAVG module is used.
561 * TODO: check if all the interrupts are mandatory
562 */
563 if (sr->ip_type == SR_TYPE_V1) {
564 sr_modify_reg(sr, ERRCONFIG_V1,
565 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
566 ERRCONFIG_MCUBOUNDINTEN),
567 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
568 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
569 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
570 } else if (sr->ip_type == SR_TYPE_V2) {
571 sr_write_reg(sr, IRQSTATUS,
572 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
573 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
574 sr_write_reg(sr, IRQENABLE_SET,
575 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
576 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
577 }
578
579 return 0;
580 }
581
582 /**
583 * sr_enable() - Enables the smartreflex module.
584 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
585 * @volt: The voltage at which the Voltage domain associated with
586 * the smartreflex module is operating at.
587 * This is required only to program the correct Ntarget value.
588 *
589 * This API is to be called from the smartreflex class driver to
590 * enable a smartreflex module. Returns 0 on success. Returns error
591 * value if the voltage passed is wrong or if ntarget value is wrong.
592 */
593 int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
594 {
595 u32 nvalue_reciprocal;
596 struct omap_volt_data *volt_data;
597 struct omap_sr *sr = _sr_lookup(voltdm);
598 int ret;
599
600 if (IS_ERR(sr)) {
601 pr_warning("%s: omap_sr struct for sr_%s not found\n",
602 __func__, voltdm->name);
603 return -EINVAL;
604 }
605
606 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
607
608 if (IS_ERR(volt_data)) {
609 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
610 "for nominal voltage %ld\n", __func__, volt);
611 return -ENODATA;
612 }
613
614 nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
615
616 if (!nvalue_reciprocal) {
617 dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
618 __func__, volt);
619 return -ENODATA;
620 }
621
622 /* errminlimit is opp dependent and hence linked to voltage */
623 sr->err_minlimit = volt_data->sr_errminlimit;
624
625 pm_runtime_get_sync(&sr->pdev->dev);
626
627 /* Check if SR is already enabled. If yes do nothing */
628 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
629 return 0;
630
631 /* Configure SR */
632 ret = sr_class->configure(voltdm);
633 if (ret)
634 return ret;
635
636 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
637
638 /* SRCONFIG - enable SR */
639 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
640 return 0;
641 }
642
643 /**
644 * sr_disable() - Disables the smartreflex module.
645 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
646 *
647 * This API is to be called from the smartreflex class driver to
648 * disable a smartreflex module.
649 */
650 void sr_disable(struct voltagedomain *voltdm)
651 {
652 struct omap_sr *sr = _sr_lookup(voltdm);
653
654 if (IS_ERR(sr)) {
655 pr_warning("%s: omap_sr struct for sr_%s not found\n",
656 __func__, voltdm->name);
657 return;
658 }
659
660 /* Check if SR clocks are already disabled. If yes do nothing */
661 if (pm_runtime_suspended(&sr->pdev->dev))
662 return;
663
664 /*
665 * Disable SR if only it is indeed enabled. Else just
666 * disable the clocks.
667 */
668 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
669 if (sr->ip_type == SR_TYPE_V1)
670 sr_v1_disable(sr);
671 else if (sr->ip_type == SR_TYPE_V2)
672 sr_v2_disable(sr);
673 }
674
675 pm_runtime_put_sync_suspend(&sr->pdev->dev);
676 }
677
678 /**
679 * sr_register_class() - API to register a smartreflex class parameters.
680 * @class_data: The structure containing various sr class specific data.
681 *
682 * This API is to be called by the smartreflex class driver to register itself
683 * with the smartreflex driver during init. Returns 0 on success else the
684 * error value.
685 */
686 int sr_register_class(struct omap_sr_class_data *class_data)
687 {
688 struct omap_sr *sr_info;
689
690 if (!class_data) {
691 pr_warning("%s:, Smartreflex class data passed is NULL\n",
692 __func__);
693 return -EINVAL;
694 }
695
696 if (sr_class) {
697 pr_warning("%s: Smartreflex class driver already registered\n",
698 __func__);
699 return -EBUSY;
700 }
701
702 sr_class = class_data;
703
704 /*
705 * Call into late init to do intializations that require
706 * both sr driver and sr class driver to be initiallized.
707 */
708 list_for_each_entry(sr_info, &sr_list, node)
709 sr_late_init(sr_info);
710
711 return 0;
712 }
713
714 /**
715 * omap_sr_enable() - API to enable SR clocks and to call into the
716 * registered smartreflex class enable API.
717 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
718 *
719 * This API is to be called from the kernel in order to enable
720 * a particular smartreflex module. This API will do the initial
721 * configurations to turn on the smartreflex module and in turn call
722 * into the registered smartreflex class enable API.
723 */
724 void omap_sr_enable(struct voltagedomain *voltdm)
725 {
726 struct omap_sr *sr = _sr_lookup(voltdm);
727
728 if (IS_ERR(sr)) {
729 pr_warning("%s: omap_sr struct for sr_%s not found\n",
730 __func__, voltdm->name);
731 return;
732 }
733
734 if (!sr->autocomp_active)
735 return;
736
737 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
738 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
739 "registered\n", __func__);
740 return;
741 }
742
743 sr_class->enable(voltdm);
744 }
745
746 /**
747 * omap_sr_disable() - API to disable SR without resetting the voltage
748 * processor voltage
749 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
750 *
751 * This API is to be called from the kernel in order to disable
752 * a particular smartreflex module. This API will in turn call
753 * into the registered smartreflex class disable API. This API will tell
754 * the smartreflex class disable not to reset the VP voltage after
755 * disabling smartreflex.
756 */
757 void omap_sr_disable(struct voltagedomain *voltdm)
758 {
759 struct omap_sr *sr = _sr_lookup(voltdm);
760
761 if (IS_ERR(sr)) {
762 pr_warning("%s: omap_sr struct for sr_%s not found\n",
763 __func__, voltdm->name);
764 return;
765 }
766
767 if (!sr->autocomp_active)
768 return;
769
770 if (!sr_class || !(sr_class->disable)) {
771 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
772 "registered\n", __func__);
773 return;
774 }
775
776 sr_class->disable(voltdm, 0);
777 }
778
779 /**
780 * omap_sr_disable_reset_volt() - API to disable SR and reset the
781 * voltage processor voltage
782 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
783 *
784 * This API is to be called from the kernel in order to disable
785 * a particular smartreflex module. This API will in turn call
786 * into the registered smartreflex class disable API. This API will tell
787 * the smartreflex class disable to reset the VP voltage after
788 * disabling smartreflex.
789 */
790 void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
791 {
792 struct omap_sr *sr = _sr_lookup(voltdm);
793
794 if (IS_ERR(sr)) {
795 pr_warning("%s: omap_sr struct for sr_%s not found\n",
796 __func__, voltdm->name);
797 return;
798 }
799
800 if (!sr->autocomp_active)
801 return;
802
803 if (!sr_class || !(sr_class->disable)) {
804 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
805 "registered\n", __func__);
806 return;
807 }
808
809 sr_class->disable(voltdm, 1);
810 }
811
812 /**
813 * omap_sr_register_pmic() - API to register pmic specific info.
814 * @pmic_data: The structure containing pmic specific data.
815 *
816 * This API is to be called from the PMIC specific code to register with
817 * smartreflex driver pmic specific info. Currently the only info required
818 * is the smartreflex init on the PMIC side.
819 */
820 void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
821 {
822 if (!pmic_data) {
823 pr_warning("%s: Trying to register NULL PMIC data structure"
824 "with smartreflex\n", __func__);
825 return;
826 }
827
828 sr_pmic_data = pmic_data;
829 }
830
831 /* PM Debug Fs enteries to enable disable smartreflex. */
832 static int omap_sr_autocomp_show(void *data, u64 *val)
833 {
834 struct omap_sr *sr_info = (struct omap_sr *) data;
835
836 if (!sr_info) {
837 pr_warning("%s: omap_sr struct not found\n", __func__);
838 return -EINVAL;
839 }
840
841 *val = sr_info->autocomp_active;
842
843 return 0;
844 }
845
846 static int omap_sr_autocomp_store(void *data, u64 val)
847 {
848 struct omap_sr *sr_info = (struct omap_sr *) data;
849
850 if (!sr_info) {
851 pr_warning("%s: omap_sr struct not found\n", __func__);
852 return -EINVAL;
853 }
854
855 /* Sanity check */
856 if (val && (val != 1)) {
857 pr_warning("%s: Invalid argument %lld\n", __func__, val);
858 return -EINVAL;
859 }
860
861 /* control enable/disable only if there is a delta in value */
862 if (sr_info->autocomp_active != val) {
863 if (!val)
864 sr_stop_vddautocomp(sr_info);
865 else
866 sr_start_vddautocomp(sr_info);
867 }
868
869 return 0;
870 }
871
872 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
873 omap_sr_autocomp_store, "%llu\n");
874
875 static int __init omap_sr_probe(struct platform_device *pdev)
876 {
877 struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
878 struct omap_sr_data *pdata = pdev->dev.platform_data;
879 struct resource *mem, *irq;
880 struct dentry *nvalue_dir;
881 struct omap_volt_data *volt_data;
882 int i, ret = 0;
883 char *name;
884
885 if (!sr_info) {
886 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
887 __func__);
888 return -ENOMEM;
889 }
890
891 platform_set_drvdata(pdev, sr_info);
892
893 if (!pdata) {
894 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
895 ret = -EINVAL;
896 goto err_free_devinfo;
897 }
898
899 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
900 if (!mem) {
901 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
902 ret = -ENODEV;
903 goto err_free_devinfo;
904 }
905
906 mem = request_mem_region(mem->start, resource_size(mem),
907 dev_name(&pdev->dev));
908 if (!mem) {
909 dev_err(&pdev->dev, "%s: no mem region\n", __func__);
910 ret = -EBUSY;
911 goto err_free_devinfo;
912 }
913
914 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
915
916 pm_runtime_enable(&pdev->dev);
917 pm_runtime_irq_safe(&pdev->dev);
918
919 sr_info->pdev = pdev;
920 sr_info->srid = pdev->id;
921 sr_info->voltdm = pdata->voltdm;
922 sr_info->nvalue_table = pdata->nvalue_table;
923 sr_info->nvalue_count = pdata->nvalue_count;
924 sr_info->senn_mod = pdata->senn_mod;
925 sr_info->senp_mod = pdata->senp_mod;
926 sr_info->autocomp_active = false;
927 sr_info->ip_type = pdata->ip_type;
928 sr_info->base = ioremap(mem->start, resource_size(mem));
929 if (!sr_info->base) {
930 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
931 ret = -ENOMEM;
932 goto err_release_region;
933 }
934
935 if (irq)
936 sr_info->irq = irq->start;
937
938 sr_set_clk_length(sr_info);
939 sr_set_regfields(sr_info);
940
941 list_add(&sr_info->node, &sr_list);
942
943 /*
944 * Call into late init to do intializations that require
945 * both sr driver and sr class driver to be initiallized.
946 */
947 if (sr_class) {
948 ret = sr_late_init(sr_info);
949 if (ret) {
950 pr_warning("%s: Error in SR late init\n", __func__);
951 goto err_iounmap;
952 }
953 }
954
955 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
956 if (!sr_dbg_dir) {
957 sr_dbg_dir = debugfs_create_dir("smartreflex", NULL);
958 if (!sr_dbg_dir) {
959 ret = PTR_ERR(sr_dbg_dir);
960 pr_err("%s:sr debugfs dir creation failed(%d)\n",
961 __func__, ret);
962 goto err_iounmap;
963 }
964 }
965
966 name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
967 if (!name) {
968 dev_err(&pdev->dev, "%s: Unable to alloc debugfs name\n",
969 __func__);
970 ret = -ENOMEM;
971 goto err_iounmap;
972 }
973 sr_info->dbg_dir = debugfs_create_dir(name, sr_dbg_dir);
974 kfree(name);
975 if (IS_ERR(sr_info->dbg_dir)) {
976 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
977 __func__);
978 ret = PTR_ERR(sr_info->dbg_dir);
979 goto err_iounmap;
980 }
981
982 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR,
983 sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops);
984 (void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir,
985 &sr_info->err_weight);
986 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir,
987 &sr_info->err_maxlimit);
988 (void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir,
989 &sr_info->err_minlimit);
990
991 nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir);
992 if (IS_ERR(nvalue_dir)) {
993 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
994 "for n-values\n", __func__);
995 ret = PTR_ERR(nvalue_dir);
996 goto err_debugfs;
997 }
998
999 omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
1000 if (!volt_data) {
1001 dev_warn(&pdev->dev, "%s: No Voltage table for the"
1002 " corresponding vdd vdd_%s. Cannot create debugfs"
1003 "entries for n-values\n",
1004 __func__, sr_info->voltdm->name);
1005 ret = -ENODATA;
1006 goto err_debugfs;
1007 }
1008
1009 for (i = 0; i < sr_info->nvalue_count; i++) {
1010 char name[NVALUE_NAME_LEN + 1];
1011
1012 snprintf(name, sizeof(name), "volt_%d",
1013 volt_data[i].volt_nominal);
1014 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
1015 &(sr_info->nvalue_table[i].nvalue));
1016 }
1017
1018 return ret;
1019
1020 err_debugfs:
1021 debugfs_remove_recursive(sr_info->dbg_dir);
1022 err_iounmap:
1023 list_del(&sr_info->node);
1024 iounmap(sr_info->base);
1025 err_release_region:
1026 release_mem_region(mem->start, resource_size(mem));
1027 err_free_devinfo:
1028 kfree(sr_info);
1029
1030 return ret;
1031 }
1032
1033 static int __devexit omap_sr_remove(struct platform_device *pdev)
1034 {
1035 struct omap_sr_data *pdata = pdev->dev.platform_data;
1036 struct omap_sr *sr_info;
1037 struct resource *mem;
1038
1039 if (!pdata) {
1040 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
1041 return -EINVAL;
1042 }
1043
1044 sr_info = _sr_lookup(pdata->voltdm);
1045 if (IS_ERR(sr_info)) {
1046 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
1047 __func__);
1048 return -EINVAL;
1049 }
1050
1051 if (sr_info->autocomp_active)
1052 sr_stop_vddautocomp(sr_info);
1053 if (sr_info->dbg_dir)
1054 debugfs_remove_recursive(sr_info->dbg_dir);
1055
1056 list_del(&sr_info->node);
1057 iounmap(sr_info->base);
1058 kfree(sr_info);
1059 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1060 release_mem_region(mem->start, resource_size(mem));
1061
1062 return 0;
1063 }
1064
1065 static void __devexit omap_sr_shutdown(struct platform_device *pdev)
1066 {
1067 struct omap_sr_data *pdata = pdev->dev.platform_data;
1068 struct omap_sr *sr_info;
1069
1070 if (!pdata) {
1071 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
1072 return;
1073 }
1074
1075 sr_info = _sr_lookup(pdata->voltdm);
1076 if (IS_ERR(sr_info)) {
1077 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
1078 __func__);
1079 return;
1080 }
1081
1082 if (sr_info->autocomp_active)
1083 sr_stop_vddautocomp(sr_info);
1084
1085 return;
1086 }
1087
1088 static struct platform_driver smartreflex_driver = {
1089 .remove = __devexit_p(omap_sr_remove),
1090 .shutdown = __devexit_p(omap_sr_shutdown),
1091 .driver = {
1092 .name = "smartreflex",
1093 },
1094 };
1095
1096 static int __init sr_init(void)
1097 {
1098 int ret = 0;
1099
1100 /*
1101 * sr_init is a late init. If by then a pmic specific API is not
1102 * registered either there is no need for anything to be done on
1103 * the PMIC side or somebody has forgotten to register a PMIC
1104 * handler. Warn for the second condition.
1105 */
1106 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1107 sr_pmic_data->sr_pmic_init();
1108 else
1109 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1110
1111 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1112 if (ret) {
1113 pr_err("%s: platform driver register failed for SR\n",
1114 __func__);
1115 return ret;
1116 }
1117
1118 return 0;
1119 }
1120 late_initcall(sr_init);
1121
1122 static void __exit sr_exit(void)
1123 {
1124 platform_driver_unregister(&smartreflex_driver);
1125 }
1126 module_exit(sr_exit);
1127
1128 MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1129 MODULE_LICENSE("GPL");
1130 MODULE_ALIAS("platform:" DRIVER_NAME);
1131 MODULE_AUTHOR("Texas Instruments Inc");
Linux kernel - Deliverables
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