2 * OMAP SmartReflex Voltage Control
4 * Author: Thara Gopinath <thara@ti.com>
6 * Copyright (C) 2010 Texas Instruments, Inc.
7 * Thara Gopinath <thara@ti.com>
9 * Copyright (C) 2008 Nokia Corporation
12 * Copyright (C) 2007 Texas Instruments, Inc.
13 * Lesly A M <x0080970@ti.com>
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.
20 #include <linux/interrupt.h>
21 #include <linux/clk.h>
23 #include <linux/debugfs.h>
24 #include <linux/delay.h>
25 #include <linux/slab.h>
26 #include <linux/pm_runtime.h>
28 #include <plat/common.h>
29 #include <plat/smartreflex.h>
33 #define SMARTREFLEX_NAME_LEN 16
34 #define NVALUE_NAME_LEN 40
35 #define SR_DISABLE_TIMEOUT 200
53 struct platform_device *pdev;
54 struct list_head node;
55 struct omap_sr_nvalue_table *nvalue_table;
56 struct voltagedomain *voltdm;
59 /* sr_list contains all the instances of smartreflex module */
60 static LIST_HEAD(sr_list);
62 static struct omap_sr_class_data *sr_class;
63 static struct omap_sr_pmic_data *sr_pmic_data;
65 static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
67 __raw_writel(value, (sr->base + offset));
70 static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,
74 u32 errconfig_offs = 0, errconfig_mask = 0;
76 reg_val = __raw_readl(sr->base + offset);
80 * Smartreflex error config register is special as it contains
81 * certain status bits which if written a 1 into means a clear
82 * of those bits. So in order to make sure no accidental write of
83 * 1 happens to those status bits, do a clear of them in the read
84 * value. This mean this API doesn't rewrite values in these bits
85 * if they are currently set, but does allow the caller to write
88 if (sr->ip_type == SR_TYPE_V1) {
89 errconfig_offs = ERRCONFIG_V1;
90 errconfig_mask = ERRCONFIG_STATUS_V1_MASK;
91 } else if (sr->ip_type == SR_TYPE_V2) {
92 errconfig_offs = ERRCONFIG_V2;
93 errconfig_mask = ERRCONFIG_VPBOUNDINTST_V2;
96 if (offset == errconfig_offs)
97 reg_val &= ~errconfig_mask;
101 __raw_writel(reg_val, (sr->base + offset));
104 static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
106 return __raw_readl(sr->base + offset);
109 static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm)
111 struct omap_sr *sr_info;
114 pr_err("%s: Null voltage domain passed!\n", __func__);
115 return ERR_PTR(-EINVAL);
118 list_for_each_entry(sr_info, &sr_list, node) {
119 if (voltdm == sr_info->voltdm)
123 return ERR_PTR(-ENODATA);
126 static irqreturn_t sr_interrupt(int irq, void *data)
128 struct omap_sr *sr_info = (struct omap_sr *)data;
131 if (sr_info->ip_type == SR_TYPE_V1) {
132 /* Read the status bits */
133 status = sr_read_reg(sr_info, ERRCONFIG_V1);
135 /* Clear them by writing back */
136 sr_write_reg(sr_info, ERRCONFIG_V1, status);
137 } else if (sr_info->ip_type == SR_TYPE_V2) {
138 /* Read the status bits */
139 sr_read_reg(sr_info, IRQSTATUS);
141 /* Clear them by writing back */
142 sr_write_reg(sr_info, IRQSTATUS, status);
145 if (sr_class->class_type == SR_CLASS2 && sr_class->notify)
146 sr_class->notify(sr_info->voltdm, status);
151 static void sr_set_clk_length(struct omap_sr *sr)
156 if (cpu_is_omap34xx())
157 sys_ck = clk_get(NULL, "sys_ck");
159 sys_ck = clk_get(NULL, "sys_clkin_ck");
161 if (IS_ERR(sys_ck)) {
162 dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n",
166 sys_clk_speed = clk_get_rate(sys_ck);
169 switch (sys_clk_speed) {
171 sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK;
174 sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK;
177 sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK;
180 sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK;
183 sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK;
186 dev_err(&sr->pdev->dev, "%s: Invalid sysclk value: %d\n",
187 __func__, sys_clk_speed);
192 static void sr_set_regfields(struct omap_sr *sr)
195 * For time being these values are defined in smartreflex.h
196 * and populated during init. May be they can be moved to board
197 * file or pmic specific data structure. In that case these structure
198 * fields will have to be populated using the pdata or pmic structure.
200 if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
201 sr->err_weight = OMAP3430_SR_ERRWEIGHT;
202 sr->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
203 sr->accum_data = OMAP3430_SR_ACCUMDATA;
204 if (!(strcmp(sr->voltdm->name, "mpu"))) {
205 sr->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
206 sr->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
208 sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
209 sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
214 static void sr_start_vddautocomp(struct omap_sr *sr)
216 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
217 dev_warn(&sr->pdev->dev,
218 "%s: smartreflex class driver not registered\n",
223 if (!sr_class->enable(sr->voltdm))
224 sr->autocomp_active = true;
227 static void sr_stop_vddautocomp(struct omap_sr *sr)
229 if (!sr_class || !(sr_class->disable)) {
230 dev_warn(&sr->pdev->dev,
231 "%s: smartreflex class driver not registered\n",
236 if (sr->autocomp_active) {
237 sr_class->disable(sr->voltdm, 1);
238 sr->autocomp_active = false;
243 * This function handles the intializations which have to be done
244 * only when both sr device and class driver regiter has
245 * completed. This will be attempted to be called from both sr class
246 * driver register and sr device intializtion API's. Only one call
247 * will ultimately succeed.
249 * Currenly this function registers interrrupt handler for a particular SR
250 * if smartreflex class driver is already registered and has
251 * requested for interrupts and the SR interrupt line in present.
253 static int sr_late_init(struct omap_sr *sr_info)
256 struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data;
257 struct resource *mem;
260 if (sr_class->class_type == SR_CLASS2 &&
261 sr_class->notify_flags && sr_info->irq) {
263 name = kzalloc(SMARTREFLEX_NAME_LEN + 1, GFP_KERNEL);
265 strcat(name, sr_info->voltdm->name);
266 ret = request_irq(sr_info->irq, sr_interrupt,
267 0, name, (void *)sr_info);
272 if (pdata && pdata->enable_on_init)
273 sr_start_vddautocomp(sr_info);
278 iounmap(sr_info->base);
279 mem = platform_get_resource(sr_info->pdev, IORESOURCE_MEM, 0);
280 release_mem_region(mem->start, resource_size(mem));
281 list_del(&sr_info->node);
282 dev_err(&sr_info->pdev->dev, "%s: ERROR in registering"
283 "interrupt handler. Smartreflex will"
284 "not function as desired\n", __func__);
290 static void sr_v1_disable(struct omap_sr *sr)
294 /* Enable MCUDisableAcknowledge interrupt */
295 sr_modify_reg(sr, ERRCONFIG_V1,
296 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
298 /* SRCONFIG - disable SR */
299 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
301 /* Disable all other SR interrupts and clear the status */
302 sr_modify_reg(sr, ERRCONFIG_V1,
303 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
304 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),
305 (ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
306 ERRCONFIG_MCUBOUNDINTST |
307 ERRCONFIG_VPBOUNDINTST_V1));
310 * Wait for SR to be disabled.
311 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
313 omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
314 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
317 if (timeout >= SR_DISABLE_TIMEOUT)
318 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
321 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
322 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
323 ERRCONFIG_MCUDISACKINTST);
326 static void sr_v2_disable(struct omap_sr *sr)
330 /* Enable MCUDisableAcknowledge interrupt */
331 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
333 /* SRCONFIG - disable SR */
334 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
336 /* Disable all other SR interrupts and clear the status */
337 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
338 ERRCONFIG_VPBOUNDINTST_V2);
339 sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |
340 IRQENABLE_MCUVALIDINT |
341 IRQENABLE_MCUBOUNDSINT));
342 sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |
343 IRQSTATUS_MCVALIDINT |
344 IRQSTATUS_MCBOUNDSINT));
347 * Wait for SR to be disabled.
348 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
350 omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
351 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
354 if (timeout >= SR_DISABLE_TIMEOUT)
355 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
358 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
359 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
360 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
363 static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs)
367 if (!sr->nvalue_table) {
368 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
373 for (i = 0; i < sr->nvalue_count; i++) {
374 if (sr->nvalue_table[i].efuse_offs == efuse_offs)
375 return sr->nvalue_table[i].nvalue;
381 /* Public Functions */
384 * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
385 * error generator module.
386 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
388 * This API is to be called from the smartreflex class driver to
389 * configure the error generator module inside the smartreflex module.
390 * SR settings if using the ERROR module inside Smartreflex.
391 * SR CLASS 3 by default uses only the ERROR module where as
392 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
393 * module. Returns 0 on success and error value in case of failure.
395 int sr_configure_errgen(struct voltagedomain *voltdm)
397 u32 sr_config, sr_errconfig, errconfig_offs, vpboundint_en;
398 u32 vpboundint_st, senp_en = 0, senn_en = 0;
399 u8 senp_shift, senn_shift;
400 struct omap_sr *sr = _sr_lookup(voltdm);
403 pr_warning("%s: omap_sr struct for sr_%s not found\n",
404 __func__, voltdm->name);
409 sr_set_clk_length(sr);
411 senp_en = sr->senp_mod;
412 senn_en = sr->senn_mod;
414 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
415 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
417 if (sr->ip_type == SR_TYPE_V1) {
418 sr_config |= SRCONFIG_DELAYCTRL;
419 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
420 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
421 errconfig_offs = ERRCONFIG_V1;
422 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
423 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
424 } else if (sr->ip_type == SR_TYPE_V2) {
425 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
426 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
427 errconfig_offs = ERRCONFIG_V2;
428 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
429 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
431 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
432 "module without specifying the ip\n", __func__);
436 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
437 sr_write_reg(sr, SRCONFIG, sr_config);
438 sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |
439 (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |
440 (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);
441 sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |
442 SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),
445 /* Enabling the interrupts if the ERROR module is used */
446 sr_modify_reg(sr, errconfig_offs,
447 vpboundint_en, (vpboundint_en | vpboundint_st));
453 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
455 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
457 * This API is to be called from the smartreflex class driver to
458 * configure the minmaxavg module inside the smartreflex module.
459 * SR settings if using the ERROR module inside Smartreflex.
460 * SR CLASS 3 by default uses only the ERROR module where as
461 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
462 * module. Returns 0 on success and error value in case of failure.
464 int sr_configure_minmax(struct voltagedomain *voltdm)
466 u32 sr_config, sr_avgwt;
467 u32 senp_en = 0, senn_en = 0;
468 u8 senp_shift, senn_shift;
469 struct omap_sr *sr = _sr_lookup(voltdm);
472 pr_warning("%s: omap_sr struct for sr_%s not found\n",
473 __func__, voltdm->name);
478 sr_set_clk_length(sr);
480 senp_en = sr->senp_mod;
481 senn_en = sr->senn_mod;
483 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
485 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
487 if (sr->ip_type == SR_TYPE_V1) {
488 sr_config |= SRCONFIG_DELAYCTRL;
489 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
490 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
491 } else if (sr->ip_type == SR_TYPE_V2) {
492 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
493 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
495 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
496 "module without specifying the ip\n", __func__);
500 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
501 sr_write_reg(sr, SRCONFIG, sr_config);
502 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
503 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
504 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
507 * Enabling the interrupts if MINMAXAVG module is used.
508 * TODO: check if all the interrupts are mandatory
510 if (sr->ip_type == SR_TYPE_V1) {
511 sr_modify_reg(sr, ERRCONFIG_V1,
512 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
513 ERRCONFIG_MCUBOUNDINTEN),
514 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
515 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
516 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
517 } else if (sr->ip_type == SR_TYPE_V2) {
518 sr_write_reg(sr, IRQSTATUS,
519 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
520 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
521 sr_write_reg(sr, IRQENABLE_SET,
522 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
523 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
530 * sr_enable() - Enables the smartreflex module.
531 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
532 * @volt: The voltage at which the Voltage domain associated with
533 * the smartreflex module is operating at.
534 * This is required only to program the correct Ntarget value.
536 * This API is to be called from the smartreflex class driver to
537 * enable a smartreflex module. Returns 0 on success. Returns error
538 * value if the voltage passed is wrong or if ntarget value is wrong.
540 int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
542 u32 nvalue_reciprocal;
543 struct omap_volt_data *volt_data;
544 struct omap_sr *sr = _sr_lookup(voltdm);
548 pr_warning("%s: omap_sr struct for sr_%s not found\n",
549 __func__, voltdm->name);
553 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
555 if (IS_ERR(volt_data)) {
556 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
557 "for nominal voltage %ld\n", __func__, volt);
561 nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
563 if (!nvalue_reciprocal) {
564 dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
569 /* errminlimit is opp dependent and hence linked to voltage */
570 sr->err_minlimit = volt_data->sr_errminlimit;
572 pm_runtime_get_sync(&sr->pdev->dev);
574 /* Check if SR is already enabled. If yes do nothing */
575 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
579 ret = sr_class->configure(voltdm);
583 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
585 /* SRCONFIG - enable SR */
586 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
591 * sr_disable() - Disables the smartreflex module.
592 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
594 * This API is to be called from the smartreflex class driver to
595 * disable a smartreflex module.
597 void sr_disable(struct voltagedomain *voltdm)
599 struct omap_sr *sr = _sr_lookup(voltdm);
602 pr_warning("%s: omap_sr struct for sr_%s not found\n",
603 __func__, voltdm->name);
607 /* Check if SR clocks are already disabled. If yes do nothing */
608 if (pm_runtime_suspended(&sr->pdev->dev))
612 * Disable SR if only it is indeed enabled. Else just
613 * disable the clocks.
615 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
616 if (sr->ip_type == SR_TYPE_V1)
618 else if (sr->ip_type == SR_TYPE_V2)
622 pm_runtime_put_sync(&sr->pdev->dev);
626 * sr_register_class() - API to register a smartreflex class parameters.
627 * @class_data: The structure containing various sr class specific data.
629 * This API is to be called by the smartreflex class driver to register itself
630 * with the smartreflex driver during init. Returns 0 on success else the
633 int sr_register_class(struct omap_sr_class_data *class_data)
635 struct omap_sr *sr_info;
638 pr_warning("%s:, Smartreflex class data passed is NULL\n",
644 pr_warning("%s: Smartreflex class driver already registered\n",
649 sr_class = class_data;
652 * Call into late init to do intializations that require
653 * both sr driver and sr class driver to be initiallized.
655 list_for_each_entry(sr_info, &sr_list, node)
656 sr_late_init(sr_info);
662 * omap_sr_enable() - API to enable SR clocks and to call into the
663 * registered smartreflex class enable API.
664 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
666 * This API is to be called from the kernel in order to enable
667 * a particular smartreflex module. This API will do the initial
668 * configurations to turn on the smartreflex module and in turn call
669 * into the registered smartreflex class enable API.
671 void omap_sr_enable(struct voltagedomain *voltdm)
673 struct omap_sr *sr = _sr_lookup(voltdm);
676 pr_warning("%s: omap_sr struct for sr_%s not found\n",
677 __func__, voltdm->name);
681 if (!sr->autocomp_active)
684 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
685 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
686 "registered\n", __func__);
690 sr_class->enable(voltdm);
694 * omap_sr_disable() - API to disable SR without resetting the voltage
696 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
698 * This API is to be called from the kernel in order to disable
699 * a particular smartreflex module. This API will in turn call
700 * into the registered smartreflex class disable API. This API will tell
701 * the smartreflex class disable not to reset the VP voltage after
702 * disabling smartreflex.
704 void omap_sr_disable(struct voltagedomain *voltdm)
706 struct omap_sr *sr = _sr_lookup(voltdm);
709 pr_warning("%s: omap_sr struct for sr_%s not found\n",
710 __func__, voltdm->name);
714 if (!sr->autocomp_active)
717 if (!sr_class || !(sr_class->disable)) {
718 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
719 "registered\n", __func__);
723 sr_class->disable(voltdm, 0);
727 * omap_sr_disable_reset_volt() - API to disable SR and reset the
728 * voltage processor voltage
729 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
731 * This API is to be called from the kernel in order to disable
732 * a particular smartreflex module. This API will in turn call
733 * into the registered smartreflex class disable API. This API will tell
734 * the smartreflex class disable to reset the VP voltage after
735 * disabling smartreflex.
737 void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
739 struct omap_sr *sr = _sr_lookup(voltdm);
742 pr_warning("%s: omap_sr struct for sr_%s not found\n",
743 __func__, voltdm->name);
747 if (!sr->autocomp_active)
750 if (!sr_class || !(sr_class->disable)) {
751 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
752 "registered\n", __func__);
756 sr_class->disable(voltdm, 1);
760 * omap_sr_register_pmic() - API to register pmic specific info.
761 * @pmic_data: The structure containing pmic specific data.
763 * This API is to be called from the PMIC specific code to register with
764 * smartreflex driver pmic specific info. Currently the only info required
765 * is the smartreflex init on the PMIC side.
767 void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
770 pr_warning("%s: Trying to register NULL PMIC data structure"
771 "with smartreflex\n", __func__);
775 sr_pmic_data = pmic_data;
778 /* PM Debug Fs enteries to enable disable smartreflex. */
779 static int omap_sr_autocomp_show(void *data, u64 *val)
781 struct omap_sr *sr_info = (struct omap_sr *) data;
784 pr_warning("%s: omap_sr struct not found\n", __func__);
788 *val = sr_info->autocomp_active;
793 static int omap_sr_autocomp_store(void *data, u64 val)
795 struct omap_sr *sr_info = (struct omap_sr *) data;
798 pr_warning("%s: omap_sr struct not found\n", __func__);
803 if (val && (val != 1)) {
804 pr_warning("%s: Invalid argument %lld\n", __func__, val);
809 sr_stop_vddautocomp(sr_info);
811 sr_start_vddautocomp(sr_info);
816 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
817 omap_sr_autocomp_store, "%llu\n");
819 static int __init omap_sr_probe(struct platform_device *pdev)
821 struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
822 struct omap_sr_data *pdata = pdev->dev.platform_data;
823 struct resource *mem, *irq;
824 struct dentry *vdd_dbg_dir, *dbg_dir, *nvalue_dir;
825 struct omap_volt_data *volt_data;
829 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
835 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
837 goto err_free_devinfo;
840 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
842 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
844 goto err_free_devinfo;
847 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
849 pm_runtime_enable(&pdev->dev);
851 sr_info->pdev = pdev;
852 sr_info->srid = pdev->id;
853 sr_info->voltdm = pdata->voltdm;
854 sr_info->nvalue_table = pdata->nvalue_table;
855 sr_info->nvalue_count = pdata->nvalue_count;
856 sr_info->senn_mod = pdata->senn_mod;
857 sr_info->senp_mod = pdata->senp_mod;
858 sr_info->autocomp_active = false;
859 sr_info->ip_type = pdata->ip_type;
860 sr_info->base = ioremap(mem->start, resource_size(mem));
861 if (!sr_info->base) {
862 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
864 goto err_release_region;
868 sr_info->irq = irq->start;
870 sr_set_clk_length(sr_info);
871 sr_set_regfields(sr_info);
873 list_add(&sr_info->node, &sr_list);
876 * Call into late init to do intializations that require
877 * both sr driver and sr class driver to be initiallized.
880 ret = sr_late_init(sr_info);
882 pr_warning("%s: Error in SR late init\n", __func__);
883 goto err_release_region;
887 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
890 * If the voltage domain debugfs directory is not created, do
891 * not try to create rest of the debugfs entries.
893 vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm);
896 goto err_release_region;
899 dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir);
900 if (IS_ERR(dbg_dir)) {
901 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
903 ret = PTR_ERR(dbg_dir);
904 goto err_release_region;
907 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR, dbg_dir,
908 (void *)sr_info, &pm_sr_fops);
909 (void) debugfs_create_x32("errweight", S_IRUGO, dbg_dir,
910 &sr_info->err_weight);
911 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, dbg_dir,
912 &sr_info->err_maxlimit);
913 (void) debugfs_create_x32("errminlimit", S_IRUGO, dbg_dir,
914 &sr_info->err_minlimit);
916 nvalue_dir = debugfs_create_dir("nvalue", dbg_dir);
917 if (IS_ERR(nvalue_dir)) {
918 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
919 "for n-values\n", __func__);
920 ret = PTR_ERR(nvalue_dir);
921 goto err_release_region;
924 omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
926 dev_warn(&pdev->dev, "%s: No Voltage table for the"
927 " corresponding vdd vdd_%s. Cannot create debugfs"
928 "entries for n-values\n",
929 __func__, sr_info->voltdm->name);
931 goto err_release_region;
934 for (i = 0; i < sr_info->nvalue_count; i++) {
935 char name[NVALUE_NAME_LEN + 1];
937 snprintf(name, sizeof(name), "volt_%d",
938 volt_data[i].volt_nominal);
939 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
940 &(sr_info->nvalue_table[i].nvalue));
946 release_mem_region(mem->start, resource_size(mem));
953 static int __devexit omap_sr_remove(struct platform_device *pdev)
955 struct omap_sr_data *pdata = pdev->dev.platform_data;
956 struct omap_sr *sr_info;
957 struct resource *mem;
960 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
964 sr_info = _sr_lookup(pdata->voltdm);
965 if (IS_ERR(sr_info)) {
966 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
971 if (sr_info->autocomp_active)
972 sr_stop_vddautocomp(sr_info);
974 list_del(&sr_info->node);
975 iounmap(sr_info->base);
977 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
978 release_mem_region(mem->start, resource_size(mem));
983 static struct platform_driver smartreflex_driver = {
984 .remove = omap_sr_remove,
986 .name = "smartreflex",
990 static int __init sr_init(void)
995 * sr_init is a late init. If by then a pmic specific API is not
996 * registered either there is no need for anything to be done on
997 * the PMIC side or somebody has forgotten to register a PMIC
998 * handler. Warn for the second condition.
1000 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1001 sr_pmic_data->sr_pmic_init();
1003 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1005 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1007 pr_err("%s: platform driver register failed for SR\n",
1015 static void __exit sr_exit(void)
1017 platform_driver_unregister(&smartreflex_driver);
1019 late_initcall(sr_init);
1020 module_exit(sr_exit);
1022 MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1023 MODULE_LICENSE("GPL");
1024 MODULE_ALIAS("platform:" DRIVER_NAME);
1025 MODULE_AUTHOR("Texas Instruments Inc");