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__);
289 static void sr_v1_disable(struct omap_sr *sr)
293 /* Enable MCUDisableAcknowledge interrupt */
294 sr_modify_reg(sr, ERRCONFIG_V1,
295 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
297 /* SRCONFIG - disable SR */
298 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
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));
309 * Wait for SR to be disabled.
310 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
312 omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
313 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
316 if (timeout >= SR_DISABLE_TIMEOUT)
317 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
320 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
321 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
322 ERRCONFIG_MCUDISACKINTST);
325 static void sr_v2_disable(struct omap_sr *sr)
329 /* Enable MCUDisableAcknowledge interrupt */
330 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
332 /* SRCONFIG - disable SR */
333 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
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));
346 * Wait for SR to be disabled.
347 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
349 omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
350 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
353 if (timeout >= SR_DISABLE_TIMEOUT)
354 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
357 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
358 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
359 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
362 static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs)
366 if (!sr->nvalue_table) {
367 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
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;
380 /* Public Functions */
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.
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.
394 int sr_configure_errgen(struct voltagedomain *voltdm)
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);
402 pr_warning("%s: omap_sr struct for sr_%s not found\n",
403 __func__, voltdm->name);
408 sr_set_clk_length(sr);
410 senp_en = sr->senp_mod;
411 senn_en = sr->senn_mod;
413 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
414 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
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;
430 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
431 "module without specifying the ip\n", __func__);
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),
444 /* Enabling the interrupts if the ERROR module is used */
445 sr_modify_reg(sr, errconfig_offs,
446 vpboundint_en, (vpboundint_en | vpboundint_st));
452 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
454 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
456 * This API is to be called from the smartreflex class driver to
457 * configure the minmaxavg module inside the smartreflex module.
458 * SR settings if using the ERROR module inside Smartreflex.
459 * SR CLASS 3 by default uses only the ERROR module where as
460 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
461 * module. Returns 0 on success and error value in case of failure.
463 int sr_configure_minmax(struct voltagedomain *voltdm)
465 u32 sr_config, sr_avgwt;
466 u32 senp_en = 0, senn_en = 0;
467 u8 senp_shift, senn_shift;
468 struct omap_sr *sr = _sr_lookup(voltdm);
471 pr_warning("%s: omap_sr struct for sr_%s not found\n",
472 __func__, voltdm->name);
477 sr_set_clk_length(sr);
479 senp_en = sr->senp_mod;
480 senn_en = sr->senn_mod;
482 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
484 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
486 if (sr->ip_type == SR_TYPE_V1) {
487 sr_config |= SRCONFIG_DELAYCTRL;
488 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
489 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
490 } else if (sr->ip_type == SR_TYPE_V2) {
491 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
492 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
494 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
495 "module without specifying the ip\n", __func__);
499 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
500 sr_write_reg(sr, SRCONFIG, sr_config);
501 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
502 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
503 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
506 * Enabling the interrupts if MINMAXAVG module is used.
507 * TODO: check if all the interrupts are mandatory
509 if (sr->ip_type == SR_TYPE_V1) {
510 sr_modify_reg(sr, ERRCONFIG_V1,
511 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
512 ERRCONFIG_MCUBOUNDINTEN),
513 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
514 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
515 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
516 } else if (sr->ip_type == SR_TYPE_V2) {
517 sr_write_reg(sr, IRQSTATUS,
518 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
519 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
520 sr_write_reg(sr, IRQENABLE_SET,
521 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
522 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
529 * sr_enable() - Enables the smartreflex module.
530 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
531 * @volt: The voltage at which the Voltage domain associated with
532 * the smartreflex module is operating at.
533 * This is required only to program the correct Ntarget value.
535 * This API is to be called from the smartreflex class driver to
536 * enable a smartreflex module. Returns 0 on success. Returns error
537 * value if the voltage passed is wrong or if ntarget value is wrong.
539 int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
541 u32 nvalue_reciprocal;
542 struct omap_volt_data *volt_data;
543 struct omap_sr *sr = _sr_lookup(voltdm);
547 pr_warning("%s: omap_sr struct for sr_%s not found\n",
548 __func__, voltdm->name);
552 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
554 if (IS_ERR(volt_data)) {
555 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
556 "for nominal voltage %ld\n", __func__, volt);
560 nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
562 if (!nvalue_reciprocal) {
563 dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
568 /* errminlimit is opp dependent and hence linked to voltage */
569 sr->err_minlimit = volt_data->sr_errminlimit;
571 pm_runtime_get_sync(&sr->pdev->dev);
573 /* Check if SR is already enabled. If yes do nothing */
574 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
578 ret = sr_class->configure(voltdm);
582 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
584 /* SRCONFIG - enable SR */
585 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
590 * sr_disable() - Disables the smartreflex module.
591 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
593 * This API is to be called from the smartreflex class driver to
594 * disable a smartreflex module.
596 void sr_disable(struct voltagedomain *voltdm)
598 struct omap_sr *sr = _sr_lookup(voltdm);
601 pr_warning("%s: omap_sr struct for sr_%s not found\n",
602 __func__, voltdm->name);
606 /* Check if SR clocks are already disabled. If yes do nothing */
607 if (pm_runtime_suspended(&sr->pdev->dev))
611 * Disable SR if only it is indeed enabled. Else just
612 * disable the clocks.
614 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
615 if (sr->ip_type == SR_TYPE_V1)
617 else if (sr->ip_type == SR_TYPE_V2)
621 pm_runtime_put_sync(&sr->pdev->dev);
625 * sr_register_class() - API to register a smartreflex class parameters.
626 * @class_data: The structure containing various sr class specific data.
628 * This API is to be called by the smartreflex class driver to register itself
629 * with the smartreflex driver during init. Returns 0 on success else the
632 int sr_register_class(struct omap_sr_class_data *class_data)
634 struct omap_sr *sr_info;
637 pr_warning("%s:, Smartreflex class data passed is NULL\n",
643 pr_warning("%s: Smartreflex class driver already registered\n",
648 sr_class = class_data;
651 * Call into late init to do intializations that require
652 * both sr driver and sr class driver to be initiallized.
654 list_for_each_entry(sr_info, &sr_list, node)
655 sr_late_init(sr_info);
661 * omap_sr_enable() - API to enable SR clocks and to call into the
662 * registered smartreflex class enable API.
663 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
665 * This API is to be called from the kernel in order to enable
666 * a particular smartreflex module. This API will do the initial
667 * configurations to turn on the smartreflex module and in turn call
668 * into the registered smartreflex class enable API.
670 void omap_sr_enable(struct voltagedomain *voltdm)
672 struct omap_sr *sr = _sr_lookup(voltdm);
675 pr_warning("%s: omap_sr struct for sr_%s not found\n",
676 __func__, voltdm->name);
680 if (!sr->autocomp_active)
683 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
684 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
685 "registered\n", __func__);
689 sr_class->enable(voltdm);
693 * omap_sr_disable() - API to disable SR without resetting the voltage
695 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
697 * This API is to be called from the kernel in order to disable
698 * a particular smartreflex module. This API will in turn call
699 * into the registered smartreflex class disable API. This API will tell
700 * the smartreflex class disable not to reset the VP voltage after
701 * disabling smartreflex.
703 void omap_sr_disable(struct voltagedomain *voltdm)
705 struct omap_sr *sr = _sr_lookup(voltdm);
708 pr_warning("%s: omap_sr struct for sr_%s not found\n",
709 __func__, voltdm->name);
713 if (!sr->autocomp_active)
716 if (!sr_class || !(sr_class->disable)) {
717 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
718 "registered\n", __func__);
722 sr_class->disable(voltdm, 0);
726 * omap_sr_disable_reset_volt() - API to disable SR and reset the
727 * voltage processor voltage
728 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
730 * This API is to be called from the kernel in order to disable
731 * a particular smartreflex module. This API will in turn call
732 * into the registered smartreflex class disable API. This API will tell
733 * the smartreflex class disable to reset the VP voltage after
734 * disabling smartreflex.
736 void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
738 struct omap_sr *sr = _sr_lookup(voltdm);
741 pr_warning("%s: omap_sr struct for sr_%s not found\n",
742 __func__, voltdm->name);
746 if (!sr->autocomp_active)
749 if (!sr_class || !(sr_class->disable)) {
750 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
751 "registered\n", __func__);
755 sr_class->disable(voltdm, 1);
759 * omap_sr_register_pmic() - API to register pmic specific info.
760 * @pmic_data: The structure containing pmic specific data.
762 * This API is to be called from the PMIC specific code to register with
763 * smartreflex driver pmic specific info. Currently the only info required
764 * is the smartreflex init on the PMIC side.
766 void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
769 pr_warning("%s: Trying to register NULL PMIC data structure"
770 "with smartreflex\n", __func__);
774 sr_pmic_data = pmic_data;
777 /* PM Debug Fs enteries to enable disable smartreflex. */
778 static int omap_sr_autocomp_show(void *data, u64 *val)
780 struct omap_sr *sr_info = (struct omap_sr *) data;
783 pr_warning("%s: omap_sr struct not found\n", __func__);
787 *val = sr_info->autocomp_active;
792 static int omap_sr_autocomp_store(void *data, u64 val)
794 struct omap_sr *sr_info = (struct omap_sr *) data;
797 pr_warning("%s: omap_sr struct not found\n", __func__);
802 if (val && (val != 1)) {
803 pr_warning("%s: Invalid argument %lld\n", __func__, val);
808 sr_stop_vddautocomp(sr_info);
810 sr_start_vddautocomp(sr_info);
815 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
816 omap_sr_autocomp_store, "%llu\n");
818 static int __init omap_sr_probe(struct platform_device *pdev)
820 struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
821 struct omap_sr_data *pdata = pdev->dev.platform_data;
822 struct resource *mem, *irq;
823 struct dentry *vdd_dbg_dir, *dbg_dir, *nvalue_dir;
824 struct omap_volt_data *volt_data;
828 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
834 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
836 goto err_free_devinfo;
839 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
841 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
843 goto err_free_devinfo;
846 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
848 pm_runtime_enable(&pdev->dev);
850 sr_info->pdev = pdev;
851 sr_info->srid = pdev->id;
852 sr_info->voltdm = pdata->voltdm;
853 sr_info->nvalue_table = pdata->nvalue_table;
854 sr_info->nvalue_count = pdata->nvalue_count;
855 sr_info->senn_mod = pdata->senn_mod;
856 sr_info->senp_mod = pdata->senp_mod;
857 sr_info->autocomp_active = false;
858 sr_info->ip_type = pdata->ip_type;
859 sr_info->base = ioremap(mem->start, resource_size(mem));
860 if (!sr_info->base) {
861 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
863 goto err_release_region;
867 sr_info->irq = irq->start;
869 sr_set_clk_length(sr_info);
870 sr_set_regfields(sr_info);
872 list_add(&sr_info->node, &sr_list);
875 * Call into late init to do intializations that require
876 * both sr driver and sr class driver to be initiallized.
879 ret = sr_late_init(sr_info);
881 pr_warning("%s: Error in SR late init\n", __func__);
886 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
889 * If the voltage domain debugfs directory is not created, do
890 * not try to create rest of the debugfs entries.
892 vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm);
896 dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir);
897 if (IS_ERR(dbg_dir)) {
898 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
900 return PTR_ERR(dbg_dir);
903 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR, dbg_dir,
904 (void *)sr_info, &pm_sr_fops);
905 (void) debugfs_create_x32("errweight", S_IRUGO, dbg_dir,
906 &sr_info->err_weight);
907 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, dbg_dir,
908 &sr_info->err_maxlimit);
909 (void) debugfs_create_x32("errminlimit", S_IRUGO, dbg_dir,
910 &sr_info->err_minlimit);
912 nvalue_dir = debugfs_create_dir("nvalue", dbg_dir);
913 if (IS_ERR(nvalue_dir)) {
914 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
915 "for n-values\n", __func__);
916 return PTR_ERR(nvalue_dir);
919 omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
921 dev_warn(&pdev->dev, "%s: No Voltage table for the"
922 " corresponding vdd vdd_%s. Cannot create debugfs"
923 "entries for n-values\n",
924 __func__, sr_info->voltdm->name);
928 for (i = 0; i < sr_info->nvalue_count; i++) {
932 name = kzalloc(NVALUE_NAME_LEN + 1, GFP_KERNEL);
934 dev_err(&pdev->dev, "%s: Unable to allocate memory"
935 " for n-value directory name\n", __func__);
939 strcpy(name, "volt_");
940 sprintf(volt_name, "%d", volt_data[i].volt_nominal);
941 strcat(name, volt_name);
942 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
943 &(sr_info->nvalue_table[i].nvalue));
949 release_mem_region(mem->start, resource_size(mem));
956 static int __devexit omap_sr_remove(struct platform_device *pdev)
958 struct omap_sr_data *pdata = pdev->dev.platform_data;
959 struct omap_sr *sr_info;
960 struct resource *mem;
963 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
967 sr_info = _sr_lookup(pdata->voltdm);
968 if (IS_ERR(sr_info)) {
969 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
974 if (sr_info->autocomp_active)
975 sr_stop_vddautocomp(sr_info);
977 list_del(&sr_info->node);
978 iounmap(sr_info->base);
980 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
981 release_mem_region(mem->start, resource_size(mem));
986 static struct platform_driver smartreflex_driver = {
987 .remove = omap_sr_remove,
989 .name = "smartreflex",
993 static int __init sr_init(void)
998 * sr_init is a late init. If by then a pmic specific API is not
999 * registered either there is no need for anything to be done on
1000 * the PMIC side or somebody has forgotten to register a PMIC
1001 * handler. Warn for the second condition.
1003 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1004 sr_pmic_data->sr_pmic_init();
1006 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1008 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1010 pr_err("%s: platform driver register failed for SR\n",
1018 static void __exit sr_exit(void)
1020 platform_driver_unregister(&smartreflex_driver);
1022 late_initcall(sr_init);
1023 module_exit(sr_exit);
1025 MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1026 MODULE_LICENSE("GPL");
1027 MODULE_ALIAS("platform:" DRIVER_NAME);
1028 MODULE_AUTHOR("Texas Instruments Inc");