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/module.h>
21 #include <linux/interrupt.h>
22 #include <linux/clk.h>
24 #include <linux/debugfs.h>
25 #include <linux/delay.h>
26 #include <linux/slab.h>
27 #include <linux/pm_runtime.h>
29 #include <plat/common.h>
32 #include "smartreflex.h"
34 #define SMARTREFLEX_NAME_LEN 16
35 #define NVALUE_NAME_LEN 40
36 #define SR_DISABLE_TIMEOUT 200
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;
61 /* sr_list contains all the instances of smartreflex module */
62 static LIST_HEAD(sr_list);
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;
68 static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
70 __raw_writel(value, (sr->base + offset));
73 static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,
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
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;
92 reg_val = __raw_readl(sr->base + offset);
99 __raw_writel(reg_val, (sr->base + offset));
102 static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
104 return __raw_readl(sr->base + offset);
107 static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm)
109 struct omap_sr *sr_info;
112 pr_err("%s: Null voltage domain passed!\n", __func__);
113 return ERR_PTR(-EINVAL);
116 list_for_each_entry(sr_info, &sr_list, node) {
117 if (voltdm == sr_info->voltdm)
121 return ERR_PTR(-ENODATA);
124 static irqreturn_t sr_interrupt(int irq, void *data)
126 struct omap_sr *sr_info = (struct omap_sr *)data;
129 if (sr_info->ip_type == SR_TYPE_V1) {
130 /* Read the status bits */
131 status = sr_read_reg(sr_info, ERRCONFIG_V1);
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);
139 /* Clear them by writing back */
140 sr_write_reg(sr_info, IRQSTATUS, status);
143 if (sr_class->notify)
144 sr_class->notify(sr_info->voltdm, status);
149 static void sr_set_clk_length(struct omap_sr *sr)
154 if (cpu_is_omap34xx())
155 sys_ck = clk_get(NULL, "sys_ck");
157 sys_ck = clk_get(NULL, "sys_clkin_ck");
159 if (IS_ERR(sys_ck)) {
160 dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n",
164 sys_clk_speed = clk_get_rate(sys_ck);
167 switch (sys_clk_speed) {
169 sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK;
172 sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK;
175 sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK;
178 sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK;
181 sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK;
184 dev_err(&sr->pdev->dev, "%s: Invalid sysclk value: %d\n",
185 __func__, sys_clk_speed);
190 static void sr_set_regfields(struct omap_sr *sr)
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.
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;
206 sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
207 sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
212 static void sr_start_vddautocomp(struct omap_sr *sr)
214 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
215 dev_warn(&sr->pdev->dev,
216 "%s: smartreflex class driver not registered\n",
221 if (!sr_class->enable(sr->voltdm))
222 sr->autocomp_active = true;
225 static void sr_stop_vddautocomp(struct omap_sr *sr)
227 if (!sr_class || !(sr_class->disable)) {
228 dev_warn(&sr->pdev->dev,
229 "%s: smartreflex class driver not registered\n",
234 if (sr->autocomp_active) {
235 sr_class->disable(sr->voltdm, 1);
236 sr->autocomp_active = false;
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.
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.
251 static int sr_late_init(struct omap_sr *sr_info)
254 struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data;
255 struct resource *mem;
258 if (sr_class->notify && sr_class->notify_flags && sr_info->irq) {
259 name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
264 ret = request_irq(sr_info->irq, sr_interrupt,
265 0, name, (void *)sr_info);
268 disable_irq(sr_info->irq);
271 if (pdata && pdata->enable_on_init)
272 sr_start_vddautocomp(sr_info);
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__);
289 static void sr_v1_disable(struct omap_sr *sr)
292 int errconf_val = ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
293 ERRCONFIG_MCUBOUNDINTST;
295 /* Enable MCUDisableAcknowledge interrupt */
296 sr_modify_reg(sr, ERRCONFIG_V1,
297 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
299 /* SRCONFIG - disable SR */
300 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
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),
311 * Wait for SR to be disabled.
312 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
314 omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
315 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
318 if (timeout >= SR_DISABLE_TIMEOUT)
319 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
322 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
323 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
324 ERRCONFIG_MCUDISACKINTST);
327 static void sr_v2_disable(struct omap_sr *sr)
331 /* Enable MCUDisableAcknowledge interrupt */
332 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
334 /* SRCONFIG - disable SR */
335 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
338 * Disable all other SR interrupts and clear the status
339 * write to status register ONLY on need basis - only if status
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);
346 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
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));
356 * Wait for SR to be disabled.
357 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
359 omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
360 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
363 if (timeout >= SR_DISABLE_TIMEOUT)
364 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
367 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
368 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
369 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
372 static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs)
376 if (!sr->nvalue_table) {
377 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
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;
390 /* Public Functions */
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.
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.
404 int sr_configure_errgen(struct voltagedomain *voltdm)
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);
412 pr_warning("%s: omap_sr struct for sr_%s not found\n",
413 __func__, voltdm->name);
418 sr_set_clk_length(sr);
420 senp_en = sr->senp_mod;
421 senn_en = sr->senn_mod;
423 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
424 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
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;
440 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
441 "module without specifying the ip\n", __func__);
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),
454 /* Enabling the interrupts if the ERROR module is used */
455 sr_modify_reg(sr, errconfig_offs, (vpboundint_en | vpboundint_st),
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.
465 * This API is to be called from the smartreflex class driver to
466 * disable the error generator module inside the smartreflex module.
468 * Returns 0 on success and error value in case of failure.
470 int sr_disable_errgen(struct voltagedomain *voltdm)
472 u32 errconfig_offs, vpboundint_en;
474 struct omap_sr *sr = _sr_lookup(voltdm);
477 pr_warning("%s: omap_sr struct for sr_%s not found\n",
478 __func__, voltdm->name);
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;
491 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
492 "module without specifying the ip\n", __func__);
496 /* Disable the interrupts of ERROR module */
497 sr_modify_reg(sr, errconfig_offs, vpboundint_en | vpboundint_st, 0);
499 /* Disable the Sensor and errorgen */
500 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN, 0);
506 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
508 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
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.
517 int sr_configure_minmax(struct voltagedomain *voltdm)
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);
525 pr_warning("%s: omap_sr struct for sr_%s not found\n",
526 __func__, voltdm->name);
531 sr_set_clk_length(sr);
533 senp_en = sr->senp_mod;
534 senn_en = sr->senn_mod;
536 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
538 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
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;
548 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
549 "module without specifying the ip\n", __func__);
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);
560 * Enabling the interrupts if MINMAXAVG module is used.
561 * TODO: check if all the interrupts are mandatory
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);
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.
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.
593 int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
595 u32 nvalue_reciprocal;
596 struct omap_volt_data *volt_data;
597 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 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
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);
614 nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
616 if (!nvalue_reciprocal) {
617 dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
622 /* errminlimit is opp dependent and hence linked to voltage */
623 sr->err_minlimit = volt_data->sr_errminlimit;
625 pm_runtime_get_sync(&sr->pdev->dev);
627 /* Check if SR is already enabled. If yes do nothing */
628 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
632 ret = sr_class->configure(voltdm);
636 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
638 /* SRCONFIG - enable SR */
639 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
644 * sr_disable() - Disables the smartreflex module.
645 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
647 * This API is to be called from the smartreflex class driver to
648 * disable a smartreflex module.
650 void sr_disable(struct voltagedomain *voltdm)
652 struct omap_sr *sr = _sr_lookup(voltdm);
655 pr_warning("%s: omap_sr struct for sr_%s not found\n",
656 __func__, voltdm->name);
660 /* Check if SR clocks are already disabled. If yes do nothing */
661 if (pm_runtime_suspended(&sr->pdev->dev))
665 * Disable SR if only it is indeed enabled. Else just
666 * disable the clocks.
668 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
669 if (sr->ip_type == SR_TYPE_V1)
671 else if (sr->ip_type == SR_TYPE_V2)
675 pm_runtime_put_sync_suspend(&sr->pdev->dev);
679 * sr_register_class() - API to register a smartreflex class parameters.
680 * @class_data: The structure containing various sr class specific data.
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
686 int sr_register_class(struct omap_sr_class_data *class_data)
688 struct omap_sr *sr_info;
691 pr_warning("%s:, Smartreflex class data passed is NULL\n",
697 pr_warning("%s: Smartreflex class driver already registered\n",
702 sr_class = class_data;
705 * Call into late init to do intializations that require
706 * both sr driver and sr class driver to be initiallized.
708 list_for_each_entry(sr_info, &sr_list, node)
709 sr_late_init(sr_info);
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.
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.
724 void omap_sr_enable(struct voltagedomain *voltdm)
726 struct omap_sr *sr = _sr_lookup(voltdm);
729 pr_warning("%s: omap_sr struct for sr_%s not found\n",
730 __func__, voltdm->name);
734 if (!sr->autocomp_active)
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__);
743 sr_class->enable(voltdm);
747 * omap_sr_disable() - API to disable SR without resetting the voltage
749 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
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.
757 void omap_sr_disable(struct voltagedomain *voltdm)
759 struct omap_sr *sr = _sr_lookup(voltdm);
762 pr_warning("%s: omap_sr struct for sr_%s not found\n",
763 __func__, voltdm->name);
767 if (!sr->autocomp_active)
770 if (!sr_class || !(sr_class->disable)) {
771 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
772 "registered\n", __func__);
776 sr_class->disable(voltdm, 0);
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.
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.
790 void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
792 struct omap_sr *sr = _sr_lookup(voltdm);
795 pr_warning("%s: omap_sr struct for sr_%s not found\n",
796 __func__, voltdm->name);
800 if (!sr->autocomp_active)
803 if (!sr_class || !(sr_class->disable)) {
804 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
805 "registered\n", __func__);
809 sr_class->disable(voltdm, 1);
813 * omap_sr_register_pmic() - API to register pmic specific info.
814 * @pmic_data: The structure containing pmic specific data.
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.
820 void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
823 pr_warning("%s: Trying to register NULL PMIC data structure"
824 "with smartreflex\n", __func__);
828 sr_pmic_data = pmic_data;
831 /* PM Debug Fs enteries to enable disable smartreflex. */
832 static int omap_sr_autocomp_show(void *data, u64 *val)
834 struct omap_sr *sr_info = (struct omap_sr *) data;
837 pr_warning("%s: omap_sr struct not found\n", __func__);
841 *val = sr_info->autocomp_active;
846 static int omap_sr_autocomp_store(void *data, u64 val)
848 struct omap_sr *sr_info = (struct omap_sr *) data;
851 pr_warning("%s: omap_sr struct not found\n", __func__);
856 if (val && (val != 1)) {
857 pr_warning("%s: Invalid argument %lld\n", __func__, val);
861 /* control enable/disable only if there is a delta in value */
862 if (sr_info->autocomp_active != val) {
864 sr_stop_vddautocomp(sr_info);
866 sr_start_vddautocomp(sr_info);
872 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
873 omap_sr_autocomp_store, "%llu\n");
875 static int __init omap_sr_probe(struct platform_device *pdev)
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;
886 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
892 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
894 goto err_free_devinfo;
897 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
899 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
901 goto err_free_devinfo;
904 mem = request_mem_region(mem->start, resource_size(mem),
905 dev_name(&pdev->dev));
907 dev_err(&pdev->dev, "%s: no mem region\n", __func__);
909 goto err_free_devinfo;
912 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
914 pm_runtime_enable(&pdev->dev);
915 pm_runtime_irq_safe(&pdev->dev);
917 sr_info->pdev = pdev;
918 sr_info->srid = pdev->id;
919 sr_info->voltdm = pdata->voltdm;
920 sr_info->nvalue_table = pdata->nvalue_table;
921 sr_info->nvalue_count = pdata->nvalue_count;
922 sr_info->senn_mod = pdata->senn_mod;
923 sr_info->senp_mod = pdata->senp_mod;
924 sr_info->autocomp_active = false;
925 sr_info->ip_type = pdata->ip_type;
926 sr_info->base = ioremap(mem->start, resource_size(mem));
927 if (!sr_info->base) {
928 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
930 goto err_release_region;
934 sr_info->irq = irq->start;
936 sr_set_clk_length(sr_info);
937 sr_set_regfields(sr_info);
939 list_add(&sr_info->node, &sr_list);
942 * Call into late init to do intializations that require
943 * both sr driver and sr class driver to be initiallized.
946 ret = sr_late_init(sr_info);
948 pr_warning("%s: Error in SR late init\n", __func__);
953 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
955 sr_dbg_dir = debugfs_create_dir("smartreflex", NULL);
957 ret = PTR_ERR(sr_dbg_dir);
958 pr_err("%s:sr debugfs dir creation failed(%d)\n",
964 name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
966 dev_err(&pdev->dev, "%s: Unable to alloc debugfs name\n",
971 sr_info->dbg_dir = debugfs_create_dir(name, sr_dbg_dir);
973 if (IS_ERR(sr_info->dbg_dir)) {
974 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
976 ret = PTR_ERR(sr_info->dbg_dir);
980 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR,
981 sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops);
982 (void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir,
983 &sr_info->err_weight);
984 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir,
985 &sr_info->err_maxlimit);
986 (void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir,
987 &sr_info->err_minlimit);
989 nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir);
990 if (IS_ERR(nvalue_dir)) {
991 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
992 "for n-values\n", __func__);
993 ret = PTR_ERR(nvalue_dir);
997 omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
999 dev_warn(&pdev->dev, "%s: No Voltage table for the"
1000 " corresponding vdd vdd_%s. Cannot create debugfs"
1001 "entries for n-values\n",
1002 __func__, sr_info->voltdm->name);
1007 for (i = 0; i < sr_info->nvalue_count; i++) {
1008 char name[NVALUE_NAME_LEN + 1];
1010 snprintf(name, sizeof(name), "volt_%d",
1011 volt_data[i].volt_nominal);
1012 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
1013 &(sr_info->nvalue_table[i].nvalue));
1019 debugfs_remove_recursive(sr_info->dbg_dir);
1021 list_del(&sr_info->node);
1022 iounmap(sr_info->base);
1024 release_mem_region(mem->start, resource_size(mem));
1031 static int __devexit omap_sr_remove(struct platform_device *pdev)
1033 struct omap_sr_data *pdata = pdev->dev.platform_data;
1034 struct omap_sr *sr_info;
1035 struct resource *mem;
1038 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
1042 sr_info = _sr_lookup(pdata->voltdm);
1043 if (IS_ERR(sr_info)) {
1044 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
1049 if (sr_info->autocomp_active)
1050 sr_stop_vddautocomp(sr_info);
1051 if (sr_info->dbg_dir)
1052 debugfs_remove_recursive(sr_info->dbg_dir);
1054 list_del(&sr_info->node);
1055 iounmap(sr_info->base);
1057 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1058 release_mem_region(mem->start, resource_size(mem));
1063 static void __devexit omap_sr_shutdown(struct platform_device *pdev)
1065 struct omap_sr_data *pdata = pdev->dev.platform_data;
1066 struct omap_sr *sr_info;
1069 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
1073 sr_info = _sr_lookup(pdata->voltdm);
1074 if (IS_ERR(sr_info)) {
1075 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
1080 if (sr_info->autocomp_active)
1081 sr_stop_vddautocomp(sr_info);
1086 static struct platform_driver smartreflex_driver = {
1087 .remove = __devexit_p(omap_sr_remove),
1088 .shutdown = __devexit_p(omap_sr_shutdown),
1090 .name = "smartreflex",
1094 static int __init sr_init(void)
1099 * sr_init is a late init. If by then a pmic specific API is not
1100 * registered either there is no need for anything to be done on
1101 * the PMIC side or somebody has forgotten to register a PMIC
1102 * handler. Warn for the second condition.
1104 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1105 sr_pmic_data->sr_pmic_init();
1107 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1109 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1111 pr_err("%s: platform driver register failed for SR\n",
1119 static void __exit sr_exit(void)
1121 platform_driver_unregister(&smartreflex_driver);
1123 late_initcall(sr_init);
1124 module_exit(sr_exit);
1126 MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1127 MODULE_LICENSE("GPL");
1128 MODULE_ALIAS("platform:" DRIVER_NAME);
1129 MODULE_AUTHOR("Texas Instruments Inc");