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>
31 #include "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;
57 struct dentry *dbg_dir;
60 /* sr_list contains all the instances of smartreflex module */
61 static LIST_HEAD(sr_list);
63 static struct omap_sr_class_data *sr_class;
64 static struct omap_sr_pmic_data *sr_pmic_data;
66 static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
68 __raw_writel(value, (sr->base + offset));
71 static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,
75 u32 errconfig_offs = 0, errconfig_mask = 0;
77 reg_val = __raw_readl(sr->base + offset);
81 * Smartreflex error config register is special as it contains
82 * certain status bits which if written a 1 into means a clear
83 * of those bits. So in order to make sure no accidental write of
84 * 1 happens to those status bits, do a clear of them in the read
85 * value. This mean this API doesn't rewrite values in these bits
86 * if they are currently set, but does allow the caller to write
89 if (sr->ip_type == SR_TYPE_V1) {
90 errconfig_offs = ERRCONFIG_V1;
91 errconfig_mask = ERRCONFIG_STATUS_V1_MASK;
92 } else if (sr->ip_type == SR_TYPE_V2) {
93 errconfig_offs = ERRCONFIG_V2;
94 errconfig_mask = ERRCONFIG_VPBOUNDINTST_V2;
97 if (offset == errconfig_offs)
98 reg_val &= ~errconfig_mask;
102 __raw_writel(reg_val, (sr->base + offset));
105 static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
107 return __raw_readl(sr->base + offset);
110 static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm)
112 struct omap_sr *sr_info;
115 pr_err("%s: Null voltage domain passed!\n", __func__);
116 return ERR_PTR(-EINVAL);
119 list_for_each_entry(sr_info, &sr_list, node) {
120 if (voltdm == sr_info->voltdm)
124 return ERR_PTR(-ENODATA);
127 static irqreturn_t sr_interrupt(int irq, void *data)
129 struct omap_sr *sr_info = (struct omap_sr *)data;
132 if (sr_info->ip_type == SR_TYPE_V1) {
133 /* Read the status bits */
134 status = sr_read_reg(sr_info, ERRCONFIG_V1);
136 /* Clear them by writing back */
137 sr_write_reg(sr_info, ERRCONFIG_V1, status);
138 } else if (sr_info->ip_type == SR_TYPE_V2) {
139 /* Read the status bits */
140 sr_read_reg(sr_info, IRQSTATUS);
142 /* Clear them by writing back */
143 sr_write_reg(sr_info, IRQSTATUS, status);
146 if (sr_class->notify)
147 sr_class->notify(sr_info->voltdm, status);
152 static void sr_set_clk_length(struct omap_sr *sr)
157 if (cpu_is_omap34xx())
158 sys_ck = clk_get(NULL, "sys_ck");
160 sys_ck = clk_get(NULL, "sys_clkin_ck");
162 if (IS_ERR(sys_ck)) {
163 dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n",
167 sys_clk_speed = clk_get_rate(sys_ck);
170 switch (sys_clk_speed) {
172 sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK;
175 sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK;
178 sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK;
181 sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK;
184 sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK;
187 dev_err(&sr->pdev->dev, "%s: Invalid sysclk value: %d\n",
188 __func__, sys_clk_speed);
193 static void sr_set_regfields(struct omap_sr *sr)
196 * For time being these values are defined in smartreflex.h
197 * and populated during init. May be they can be moved to board
198 * file or pmic specific data structure. In that case these structure
199 * fields will have to be populated using the pdata or pmic structure.
201 if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
202 sr->err_weight = OMAP3430_SR_ERRWEIGHT;
203 sr->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
204 sr->accum_data = OMAP3430_SR_ACCUMDATA;
205 if (!(strcmp(sr->voltdm->name, "mpu"))) {
206 sr->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
207 sr->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
209 sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
210 sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
215 static void sr_start_vddautocomp(struct omap_sr *sr)
217 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
218 dev_warn(&sr->pdev->dev,
219 "%s: smartreflex class driver not registered\n",
224 if (!sr_class->enable(sr->voltdm))
225 sr->autocomp_active = true;
228 static void sr_stop_vddautocomp(struct omap_sr *sr)
230 if (!sr_class || !(sr_class->disable)) {
231 dev_warn(&sr->pdev->dev,
232 "%s: smartreflex class driver not registered\n",
237 if (sr->autocomp_active) {
238 sr_class->disable(sr->voltdm, 1);
239 sr->autocomp_active = false;
244 * This function handles the intializations which have to be done
245 * only when both sr device and class driver regiter has
246 * completed. This will be attempted to be called from both sr class
247 * driver register and sr device intializtion API's. Only one call
248 * will ultimately succeed.
250 * Currently this function registers interrupt handler for a particular SR
251 * if smartreflex class driver is already registered and has
252 * requested for interrupts and the SR interrupt line in present.
254 static int sr_late_init(struct omap_sr *sr_info)
257 struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data;
258 struct resource *mem;
261 if (sr_class->notify && sr_class->notify_flags && sr_info->irq) {
262 name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
267 ret = request_irq(sr_info->irq, sr_interrupt,
268 0, name, (void *)sr_info);
271 disable_irq(sr_info->irq);
274 if (pdata && pdata->enable_on_init)
275 sr_start_vddautocomp(sr_info);
280 iounmap(sr_info->base);
281 mem = platform_get_resource(sr_info->pdev, IORESOURCE_MEM, 0);
282 release_mem_region(mem->start, resource_size(mem));
283 list_del(&sr_info->node);
284 dev_err(&sr_info->pdev->dev, "%s: ERROR in registering"
285 "interrupt handler. Smartreflex will"
286 "not function as desired\n", __func__);
292 static void sr_v1_disable(struct omap_sr *sr)
296 /* Enable MCUDisableAcknowledge interrupt */
297 sr_modify_reg(sr, ERRCONFIG_V1,
298 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
300 /* SRCONFIG - disable SR */
301 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
303 /* Disable all other SR interrupts and clear the status */
304 sr_modify_reg(sr, ERRCONFIG_V1,
305 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
306 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),
307 (ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
308 ERRCONFIG_MCUBOUNDINTST |
309 ERRCONFIG_VPBOUNDINTST_V1));
312 * Wait for SR to be disabled.
313 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
315 omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
316 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
319 if (timeout >= SR_DISABLE_TIMEOUT)
320 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
323 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
324 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
325 ERRCONFIG_MCUDISACKINTST);
328 static void sr_v2_disable(struct omap_sr *sr)
332 /* Enable MCUDisableAcknowledge interrupt */
333 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
335 /* SRCONFIG - disable SR */
336 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
338 /* Disable all other SR interrupts and clear the status */
339 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
340 ERRCONFIG_VPBOUNDINTST_V2);
341 sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |
342 IRQENABLE_MCUVALIDINT |
343 IRQENABLE_MCUBOUNDSINT));
344 sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |
345 IRQSTATUS_MCVALIDINT |
346 IRQSTATUS_MCBOUNDSINT));
349 * Wait for SR to be disabled.
350 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
352 omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
353 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
356 if (timeout >= SR_DISABLE_TIMEOUT)
357 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
360 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
361 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
362 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
365 static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs)
369 if (!sr->nvalue_table) {
370 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
375 for (i = 0; i < sr->nvalue_count; i++) {
376 if (sr->nvalue_table[i].efuse_offs == efuse_offs)
377 return sr->nvalue_table[i].nvalue;
383 /* Public Functions */
386 * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
387 * error generator module.
388 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
390 * This API is to be called from the smartreflex class driver to
391 * configure the error generator module inside the smartreflex module.
392 * SR settings if using the ERROR module inside Smartreflex.
393 * SR CLASS 3 by default uses only the ERROR module where as
394 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
395 * module. Returns 0 on success and error value in case of failure.
397 int sr_configure_errgen(struct voltagedomain *voltdm)
399 u32 sr_config, sr_errconfig, errconfig_offs, vpboundint_en;
400 u32 vpboundint_st, senp_en = 0, senn_en = 0;
401 u8 senp_shift, senn_shift;
402 struct omap_sr *sr = _sr_lookup(voltdm);
405 pr_warning("%s: omap_sr struct for sr_%s not found\n",
406 __func__, voltdm->name);
411 sr_set_clk_length(sr);
413 senp_en = sr->senp_mod;
414 senn_en = sr->senn_mod;
416 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
417 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
419 if (sr->ip_type == SR_TYPE_V1) {
420 sr_config |= SRCONFIG_DELAYCTRL;
421 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
422 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
423 errconfig_offs = ERRCONFIG_V1;
424 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
425 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
426 } else if (sr->ip_type == SR_TYPE_V2) {
427 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
428 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
429 errconfig_offs = ERRCONFIG_V2;
430 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
431 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
433 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
434 "module without specifying the ip\n", __func__);
438 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
439 sr_write_reg(sr, SRCONFIG, sr_config);
440 sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |
441 (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |
442 (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);
443 sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |
444 SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),
447 /* Enabling the interrupts if the ERROR module is used */
448 sr_modify_reg(sr, errconfig_offs,
449 vpboundint_en, (vpboundint_en | vpboundint_st));
455 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
457 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
459 * This API is to be called from the smartreflex class driver to
460 * configure the minmaxavg module inside the smartreflex module.
461 * SR settings if using the ERROR module inside Smartreflex.
462 * SR CLASS 3 by default uses only the ERROR module where as
463 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
464 * module. Returns 0 on success and error value in case of failure.
466 int sr_configure_minmax(struct voltagedomain *voltdm)
468 u32 sr_config, sr_avgwt;
469 u32 senp_en = 0, senn_en = 0;
470 u8 senp_shift, senn_shift;
471 struct omap_sr *sr = _sr_lookup(voltdm);
474 pr_warning("%s: omap_sr struct for sr_%s not found\n",
475 __func__, voltdm->name);
480 sr_set_clk_length(sr);
482 senp_en = sr->senp_mod;
483 senn_en = sr->senn_mod;
485 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
487 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
489 if (sr->ip_type == SR_TYPE_V1) {
490 sr_config |= SRCONFIG_DELAYCTRL;
491 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
492 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
493 } else if (sr->ip_type == SR_TYPE_V2) {
494 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
495 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
497 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
498 "module without specifying the ip\n", __func__);
502 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
503 sr_write_reg(sr, SRCONFIG, sr_config);
504 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
505 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
506 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
509 * Enabling the interrupts if MINMAXAVG module is used.
510 * TODO: check if all the interrupts are mandatory
512 if (sr->ip_type == SR_TYPE_V1) {
513 sr_modify_reg(sr, ERRCONFIG_V1,
514 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
515 ERRCONFIG_MCUBOUNDINTEN),
516 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
517 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
518 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
519 } else if (sr->ip_type == SR_TYPE_V2) {
520 sr_write_reg(sr, IRQSTATUS,
521 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
522 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
523 sr_write_reg(sr, IRQENABLE_SET,
524 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
525 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
532 * sr_enable() - Enables the smartreflex module.
533 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
534 * @volt: The voltage at which the Voltage domain associated with
535 * the smartreflex module is operating at.
536 * This is required only to program the correct Ntarget value.
538 * This API is to be called from the smartreflex class driver to
539 * enable a smartreflex module. Returns 0 on success. Returns error
540 * value if the voltage passed is wrong or if ntarget value is wrong.
542 int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
544 u32 nvalue_reciprocal;
545 struct omap_volt_data *volt_data;
546 struct omap_sr *sr = _sr_lookup(voltdm);
550 pr_warning("%s: omap_sr struct for sr_%s not found\n",
551 __func__, voltdm->name);
555 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
557 if (IS_ERR(volt_data)) {
558 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
559 "for nominal voltage %ld\n", __func__, volt);
563 nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
565 if (!nvalue_reciprocal) {
566 dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
571 /* errminlimit is opp dependent and hence linked to voltage */
572 sr->err_minlimit = volt_data->sr_errminlimit;
574 pm_runtime_get_sync(&sr->pdev->dev);
576 /* Check if SR is already enabled. If yes do nothing */
577 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
581 ret = sr_class->configure(voltdm);
585 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
587 /* SRCONFIG - enable SR */
588 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
593 * sr_disable() - Disables the smartreflex module.
594 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
596 * This API is to be called from the smartreflex class driver to
597 * disable a smartreflex module.
599 void sr_disable(struct voltagedomain *voltdm)
601 struct omap_sr *sr = _sr_lookup(voltdm);
604 pr_warning("%s: omap_sr struct for sr_%s not found\n",
605 __func__, voltdm->name);
609 /* Check if SR clocks are already disabled. If yes do nothing */
610 if (pm_runtime_suspended(&sr->pdev->dev))
614 * Disable SR if only it is indeed enabled. Else just
615 * disable the clocks.
617 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
618 if (sr->ip_type == SR_TYPE_V1)
620 else if (sr->ip_type == SR_TYPE_V2)
624 pm_runtime_put_sync_suspend(&sr->pdev->dev);
628 * sr_register_class() - API to register a smartreflex class parameters.
629 * @class_data: The structure containing various sr class specific data.
631 * This API is to be called by the smartreflex class driver to register itself
632 * with the smartreflex driver during init. Returns 0 on success else the
635 int sr_register_class(struct omap_sr_class_data *class_data)
637 struct omap_sr *sr_info;
640 pr_warning("%s:, Smartreflex class data passed is NULL\n",
646 pr_warning("%s: Smartreflex class driver already registered\n",
651 sr_class = class_data;
654 * Call into late init to do intializations that require
655 * both sr driver and sr class driver to be initiallized.
657 list_for_each_entry(sr_info, &sr_list, node)
658 sr_late_init(sr_info);
664 * omap_sr_enable() - API to enable SR clocks and to call into the
665 * registered smartreflex class enable API.
666 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
668 * This API is to be called from the kernel in order to enable
669 * a particular smartreflex module. This API will do the initial
670 * configurations to turn on the smartreflex module and in turn call
671 * into the registered smartreflex class enable API.
673 void omap_sr_enable(struct voltagedomain *voltdm)
675 struct omap_sr *sr = _sr_lookup(voltdm);
678 pr_warning("%s: omap_sr struct for sr_%s not found\n",
679 __func__, voltdm->name);
683 if (!sr->autocomp_active)
686 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
687 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
688 "registered\n", __func__);
692 sr_class->enable(voltdm);
696 * omap_sr_disable() - API to disable SR without resetting the voltage
698 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
700 * This API is to be called from the kernel in order to disable
701 * a particular smartreflex module. This API will in turn call
702 * into the registered smartreflex class disable API. This API will tell
703 * the smartreflex class disable not to reset the VP voltage after
704 * disabling smartreflex.
706 void omap_sr_disable(struct voltagedomain *voltdm)
708 struct omap_sr *sr = _sr_lookup(voltdm);
711 pr_warning("%s: omap_sr struct for sr_%s not found\n",
712 __func__, voltdm->name);
716 if (!sr->autocomp_active)
719 if (!sr_class || !(sr_class->disable)) {
720 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
721 "registered\n", __func__);
725 sr_class->disable(voltdm, 0);
729 * omap_sr_disable_reset_volt() - API to disable SR and reset the
730 * voltage processor voltage
731 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
733 * This API is to be called from the kernel in order to disable
734 * a particular smartreflex module. This API will in turn call
735 * into the registered smartreflex class disable API. This API will tell
736 * the smartreflex class disable to reset the VP voltage after
737 * disabling smartreflex.
739 void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
741 struct omap_sr *sr = _sr_lookup(voltdm);
744 pr_warning("%s: omap_sr struct for sr_%s not found\n",
745 __func__, voltdm->name);
749 if (!sr->autocomp_active)
752 if (!sr_class || !(sr_class->disable)) {
753 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
754 "registered\n", __func__);
758 sr_class->disable(voltdm, 1);
762 * omap_sr_register_pmic() - API to register pmic specific info.
763 * @pmic_data: The structure containing pmic specific data.
765 * This API is to be called from the PMIC specific code to register with
766 * smartreflex driver pmic specific info. Currently the only info required
767 * is the smartreflex init on the PMIC side.
769 void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
772 pr_warning("%s: Trying to register NULL PMIC data structure"
773 "with smartreflex\n", __func__);
777 sr_pmic_data = pmic_data;
780 /* PM Debug Fs enteries to enable disable smartreflex. */
781 static int omap_sr_autocomp_show(void *data, u64 *val)
783 struct omap_sr *sr_info = (struct omap_sr *) data;
786 pr_warning("%s: omap_sr struct not found\n", __func__);
790 *val = sr_info->autocomp_active;
795 static int omap_sr_autocomp_store(void *data, u64 val)
797 struct omap_sr *sr_info = (struct omap_sr *) data;
800 pr_warning("%s: omap_sr struct not found\n", __func__);
805 if (val && (val != 1)) {
806 pr_warning("%s: Invalid argument %lld\n", __func__, val);
810 /* control enable/disable only if there is a delta in value */
811 if (sr_info->autocomp_active != val) {
813 sr_stop_vddautocomp(sr_info);
815 sr_start_vddautocomp(sr_info);
821 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
822 omap_sr_autocomp_store, "%llu\n");
824 static int __init omap_sr_probe(struct platform_device *pdev)
826 struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
827 struct omap_sr_data *pdata = pdev->dev.platform_data;
828 struct resource *mem, *irq;
829 struct dentry *vdd_dbg_dir, *nvalue_dir;
830 struct omap_volt_data *volt_data;
834 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
840 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
842 goto err_free_devinfo;
845 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
847 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
849 goto err_free_devinfo;
852 mem = request_mem_region(mem->start, resource_size(mem),
853 dev_name(&pdev->dev));
855 dev_err(&pdev->dev, "%s: no mem region\n", __func__);
857 goto err_free_devinfo;
860 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
862 pm_runtime_enable(&pdev->dev);
863 pm_runtime_irq_safe(&pdev->dev);
865 sr_info->pdev = pdev;
866 sr_info->srid = pdev->id;
867 sr_info->voltdm = pdata->voltdm;
868 sr_info->nvalue_table = pdata->nvalue_table;
869 sr_info->nvalue_count = pdata->nvalue_count;
870 sr_info->senn_mod = pdata->senn_mod;
871 sr_info->senp_mod = pdata->senp_mod;
872 sr_info->autocomp_active = false;
873 sr_info->ip_type = pdata->ip_type;
874 sr_info->base = ioremap(mem->start, resource_size(mem));
875 if (!sr_info->base) {
876 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
878 goto err_release_region;
882 sr_info->irq = irq->start;
884 sr_set_clk_length(sr_info);
885 sr_set_regfields(sr_info);
887 list_add(&sr_info->node, &sr_list);
890 * Call into late init to do intializations that require
891 * both sr driver and sr class driver to be initiallized.
894 ret = sr_late_init(sr_info);
896 pr_warning("%s: Error in SR late init\n", __func__);
901 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
904 * If the voltage domain debugfs directory is not created, do
905 * not try to create rest of the debugfs entries.
907 vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm);
913 sr_info->dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir);
914 if (IS_ERR(sr_info->dbg_dir)) {
915 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
917 ret = PTR_ERR(sr_info->dbg_dir);
921 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR,
922 sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops);
923 (void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir,
924 &sr_info->err_weight);
925 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir,
926 &sr_info->err_maxlimit);
927 (void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir,
928 &sr_info->err_minlimit);
930 nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir);
931 if (IS_ERR(nvalue_dir)) {
932 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
933 "for n-values\n", __func__);
934 ret = PTR_ERR(nvalue_dir);
938 omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
940 dev_warn(&pdev->dev, "%s: No Voltage table for the"
941 " corresponding vdd vdd_%s. Cannot create debugfs"
942 "entries for n-values\n",
943 __func__, sr_info->voltdm->name);
948 for (i = 0; i < sr_info->nvalue_count; i++) {
949 char name[NVALUE_NAME_LEN + 1];
951 snprintf(name, sizeof(name), "volt_%d",
952 volt_data[i].volt_nominal);
953 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
954 &(sr_info->nvalue_table[i].nvalue));
960 debugfs_remove_recursive(sr_info->dbg_dir);
962 list_del(&sr_info->node);
963 iounmap(sr_info->base);
965 release_mem_region(mem->start, resource_size(mem));
972 static int __devexit omap_sr_remove(struct platform_device *pdev)
974 struct omap_sr_data *pdata = pdev->dev.platform_data;
975 struct omap_sr *sr_info;
976 struct resource *mem;
979 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
983 sr_info = _sr_lookup(pdata->voltdm);
984 if (IS_ERR(sr_info)) {
985 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
990 if (sr_info->autocomp_active)
991 sr_stop_vddautocomp(sr_info);
992 if (sr_info->dbg_dir)
993 debugfs_remove_recursive(sr_info->dbg_dir);
995 list_del(&sr_info->node);
996 iounmap(sr_info->base);
998 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
999 release_mem_region(mem->start, resource_size(mem));
1004 static struct platform_driver smartreflex_driver = {
1005 .remove = omap_sr_remove,
1007 .name = "smartreflex",
1011 static int __init sr_init(void)
1016 * sr_init is a late init. If by then a pmic specific API is not
1017 * registered either there is no need for anything to be done on
1018 * the PMIC side or somebody has forgotten to register a PMIC
1019 * handler. Warn for the second condition.
1021 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1022 sr_pmic_data->sr_pmic_init();
1024 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1026 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1028 pr_err("%s: platform driver register failed for SR\n",
1036 static void __exit sr_exit(void)
1038 platform_driver_unregister(&smartreflex_driver);
1040 late_initcall(sr_init);
1041 module_exit(sr_exit);
1043 MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1044 MODULE_LICENSE("GPL");
1045 MODULE_ALIAS("platform:" DRIVER_NAME);
1046 MODULE_AUTHOR("Texas Instruments Inc");