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
->class_type
== SR_CLASS2
&& 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 interrrupt 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
->class_type
== SR_CLASS2
&&
262 sr_class
->notify_flags
&& sr_info
->irq
) {
264 name
= kasprintf(GFP_KERNEL
, "sr_%s", sr_info
->voltdm
->name
);
269 ret
= request_irq(sr_info
->irq
, sr_interrupt
,
270 0, name
, (void *)sr_info
);
275 if (pdata
&& pdata
->enable_on_init
)
276 sr_start_vddautocomp(sr_info
);
281 iounmap(sr_info
->base
);
282 mem
= platform_get_resource(sr_info
->pdev
, IORESOURCE_MEM
, 0);
283 release_mem_region(mem
->start
, resource_size(mem
));
284 list_del(&sr_info
->node
);
285 dev_err(&sr_info
->pdev
->dev
, "%s: ERROR in registering"
286 "interrupt handler. Smartreflex will"
287 "not function as desired\n", __func__
);
293 static void sr_v1_disable(struct omap_sr
*sr
)
297 /* Enable MCUDisableAcknowledge interrupt */
298 sr_modify_reg(sr
, ERRCONFIG_V1
,
299 ERRCONFIG_MCUDISACKINTEN
, ERRCONFIG_MCUDISACKINTEN
);
301 /* SRCONFIG - disable SR */
302 sr_modify_reg(sr
, SRCONFIG
, SRCONFIG_SRENABLE
, 0x0);
304 /* Disable all other SR interrupts and clear the status */
305 sr_modify_reg(sr
, ERRCONFIG_V1
,
306 (ERRCONFIG_MCUACCUMINTEN
| ERRCONFIG_MCUVALIDINTEN
|
307 ERRCONFIG_MCUBOUNDINTEN
| ERRCONFIG_VPBOUNDINTEN_V1
),
308 (ERRCONFIG_MCUACCUMINTST
| ERRCONFIG_MCUVALIDINTST
|
309 ERRCONFIG_MCUBOUNDINTST
|
310 ERRCONFIG_VPBOUNDINTST_V1
));
313 * Wait for SR to be disabled.
314 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
316 omap_test_timeout((sr_read_reg(sr
, ERRCONFIG_V1
) &
317 ERRCONFIG_MCUDISACKINTST
), SR_DISABLE_TIMEOUT
,
320 if (timeout
>= SR_DISABLE_TIMEOUT
)
321 dev_warn(&sr
->pdev
->dev
, "%s: Smartreflex disable timedout\n",
324 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
325 sr_modify_reg(sr
, ERRCONFIG_V1
, ERRCONFIG_MCUDISACKINTEN
,
326 ERRCONFIG_MCUDISACKINTST
);
329 static void sr_v2_disable(struct omap_sr
*sr
)
333 /* Enable MCUDisableAcknowledge interrupt */
334 sr_write_reg(sr
, IRQENABLE_SET
, IRQENABLE_MCUDISABLEACKINT
);
336 /* SRCONFIG - disable SR */
337 sr_modify_reg(sr
, SRCONFIG
, SRCONFIG_SRENABLE
, 0x0);
339 /* Disable all other SR interrupts and clear the status */
340 sr_modify_reg(sr
, ERRCONFIG_V2
, ERRCONFIG_VPBOUNDINTEN_V2
,
341 ERRCONFIG_VPBOUNDINTST_V2
);
342 sr_write_reg(sr
, IRQENABLE_CLR
, (IRQENABLE_MCUACCUMINT
|
343 IRQENABLE_MCUVALIDINT
|
344 IRQENABLE_MCUBOUNDSINT
));
345 sr_write_reg(sr
, IRQSTATUS
, (IRQSTATUS_MCUACCUMINT
|
346 IRQSTATUS_MCVALIDINT
|
347 IRQSTATUS_MCBOUNDSINT
));
350 * Wait for SR to be disabled.
351 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
353 omap_test_timeout((sr_read_reg(sr
, IRQSTATUS
) &
354 IRQSTATUS_MCUDISABLEACKINT
), SR_DISABLE_TIMEOUT
,
357 if (timeout
>= SR_DISABLE_TIMEOUT
)
358 dev_warn(&sr
->pdev
->dev
, "%s: Smartreflex disable timedout\n",
361 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
362 sr_write_reg(sr
, IRQENABLE_CLR
, IRQENABLE_MCUDISABLEACKINT
);
363 sr_write_reg(sr
, IRQSTATUS
, IRQSTATUS_MCUDISABLEACKINT
);
366 static u32
sr_retrieve_nvalue(struct omap_sr
*sr
, u32 efuse_offs
)
370 if (!sr
->nvalue_table
) {
371 dev_warn(&sr
->pdev
->dev
, "%s: Missing ntarget value table\n",
376 for (i
= 0; i
< sr
->nvalue_count
; i
++) {
377 if (sr
->nvalue_table
[i
].efuse_offs
== efuse_offs
)
378 return sr
->nvalue_table
[i
].nvalue
;
384 /* Public Functions */
387 * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
388 * error generator module.
389 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
391 * This API is to be called from the smartreflex class driver to
392 * configure the error generator module inside the smartreflex module.
393 * SR settings if using the ERROR module inside Smartreflex.
394 * SR CLASS 3 by default uses only the ERROR module where as
395 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
396 * module. Returns 0 on success and error value in case of failure.
398 int sr_configure_errgen(struct voltagedomain
*voltdm
)
400 u32 sr_config
, sr_errconfig
, errconfig_offs
, vpboundint_en
;
401 u32 vpboundint_st
, senp_en
= 0, senn_en
= 0;
402 u8 senp_shift
, senn_shift
;
403 struct omap_sr
*sr
= _sr_lookup(voltdm
);
406 pr_warning("%s: omap_sr struct for sr_%s not found\n",
407 __func__
, voltdm
->name
);
412 sr_set_clk_length(sr
);
414 senp_en
= sr
->senp_mod
;
415 senn_en
= sr
->senn_mod
;
417 sr_config
= (sr
->clk_length
<< SRCONFIG_SRCLKLENGTH_SHIFT
) |
418 SRCONFIG_SENENABLE
| SRCONFIG_ERRGEN_EN
;
420 if (sr
->ip_type
== SR_TYPE_V1
) {
421 sr_config
|= SRCONFIG_DELAYCTRL
;
422 senn_shift
= SRCONFIG_SENNENABLE_V1_SHIFT
;
423 senp_shift
= SRCONFIG_SENPENABLE_V1_SHIFT
;
424 errconfig_offs
= ERRCONFIG_V1
;
425 vpboundint_en
= ERRCONFIG_VPBOUNDINTEN_V1
;
426 vpboundint_st
= ERRCONFIG_VPBOUNDINTST_V1
;
427 } else if (sr
->ip_type
== SR_TYPE_V2
) {
428 senn_shift
= SRCONFIG_SENNENABLE_V2_SHIFT
;
429 senp_shift
= SRCONFIG_SENPENABLE_V2_SHIFT
;
430 errconfig_offs
= ERRCONFIG_V2
;
431 vpboundint_en
= ERRCONFIG_VPBOUNDINTEN_V2
;
432 vpboundint_st
= ERRCONFIG_VPBOUNDINTST_V2
;
434 dev_err(&sr
->pdev
->dev
, "%s: Trying to Configure smartreflex"
435 "module without specifying the ip\n", __func__
);
439 sr_config
|= ((senn_en
<< senn_shift
) | (senp_en
<< senp_shift
));
440 sr_write_reg(sr
, SRCONFIG
, sr_config
);
441 sr_errconfig
= (sr
->err_weight
<< ERRCONFIG_ERRWEIGHT_SHIFT
) |
442 (sr
->err_maxlimit
<< ERRCONFIG_ERRMAXLIMIT_SHIFT
) |
443 (sr
->err_minlimit
<< ERRCONFIG_ERRMINLIMIT_SHIFT
);
444 sr_modify_reg(sr
, errconfig_offs
, (SR_ERRWEIGHT_MASK
|
445 SR_ERRMAXLIMIT_MASK
| SR_ERRMINLIMIT_MASK
),
448 /* Enabling the interrupts if the ERROR module is used */
449 sr_modify_reg(sr
, errconfig_offs
,
450 vpboundint_en
, (vpboundint_en
| vpboundint_st
));
456 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
458 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
460 * This API is to be called from the smartreflex class driver to
461 * configure the minmaxavg module inside the smartreflex module.
462 * SR settings if using the ERROR module inside Smartreflex.
463 * SR CLASS 3 by default uses only the ERROR module where as
464 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
465 * module. Returns 0 on success and error value in case of failure.
467 int sr_configure_minmax(struct voltagedomain
*voltdm
)
469 u32 sr_config
, sr_avgwt
;
470 u32 senp_en
= 0, senn_en
= 0;
471 u8 senp_shift
, senn_shift
;
472 struct omap_sr
*sr
= _sr_lookup(voltdm
);
475 pr_warning("%s: omap_sr struct for sr_%s not found\n",
476 __func__
, voltdm
->name
);
481 sr_set_clk_length(sr
);
483 senp_en
= sr
->senp_mod
;
484 senn_en
= sr
->senn_mod
;
486 sr_config
= (sr
->clk_length
<< SRCONFIG_SRCLKLENGTH_SHIFT
) |
488 (sr
->accum_data
<< SRCONFIG_ACCUMDATA_SHIFT
);
490 if (sr
->ip_type
== SR_TYPE_V1
) {
491 sr_config
|= SRCONFIG_DELAYCTRL
;
492 senn_shift
= SRCONFIG_SENNENABLE_V1_SHIFT
;
493 senp_shift
= SRCONFIG_SENPENABLE_V1_SHIFT
;
494 } else if (sr
->ip_type
== SR_TYPE_V2
) {
495 senn_shift
= SRCONFIG_SENNENABLE_V2_SHIFT
;
496 senp_shift
= SRCONFIG_SENPENABLE_V2_SHIFT
;
498 dev_err(&sr
->pdev
->dev
, "%s: Trying to Configure smartreflex"
499 "module without specifying the ip\n", __func__
);
503 sr_config
|= ((senn_en
<< senn_shift
) | (senp_en
<< senp_shift
));
504 sr_write_reg(sr
, SRCONFIG
, sr_config
);
505 sr_avgwt
= (sr
->senp_avgweight
<< AVGWEIGHT_SENPAVGWEIGHT_SHIFT
) |
506 (sr
->senn_avgweight
<< AVGWEIGHT_SENNAVGWEIGHT_SHIFT
);
507 sr_write_reg(sr
, AVGWEIGHT
, sr_avgwt
);
510 * Enabling the interrupts if MINMAXAVG module is used.
511 * TODO: check if all the interrupts are mandatory
513 if (sr
->ip_type
== SR_TYPE_V1
) {
514 sr_modify_reg(sr
, ERRCONFIG_V1
,
515 (ERRCONFIG_MCUACCUMINTEN
| ERRCONFIG_MCUVALIDINTEN
|
516 ERRCONFIG_MCUBOUNDINTEN
),
517 (ERRCONFIG_MCUACCUMINTEN
| ERRCONFIG_MCUACCUMINTST
|
518 ERRCONFIG_MCUVALIDINTEN
| ERRCONFIG_MCUVALIDINTST
|
519 ERRCONFIG_MCUBOUNDINTEN
| ERRCONFIG_MCUBOUNDINTST
));
520 } else if (sr
->ip_type
== SR_TYPE_V2
) {
521 sr_write_reg(sr
, IRQSTATUS
,
522 IRQSTATUS_MCUACCUMINT
| IRQSTATUS_MCVALIDINT
|
523 IRQSTATUS_MCBOUNDSINT
| IRQSTATUS_MCUDISABLEACKINT
);
524 sr_write_reg(sr
, IRQENABLE_SET
,
525 IRQENABLE_MCUACCUMINT
| IRQENABLE_MCUVALIDINT
|
526 IRQENABLE_MCUBOUNDSINT
| IRQENABLE_MCUDISABLEACKINT
);
533 * sr_enable() - Enables the smartreflex module.
534 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
535 * @volt: The voltage at which the Voltage domain associated with
536 * the smartreflex module is operating at.
537 * This is required only to program the correct Ntarget value.
539 * This API is to be called from the smartreflex class driver to
540 * enable a smartreflex module. Returns 0 on success. Returns error
541 * value if the voltage passed is wrong or if ntarget value is wrong.
543 int sr_enable(struct voltagedomain
*voltdm
, unsigned long volt
)
545 u32 nvalue_reciprocal
;
546 struct omap_volt_data
*volt_data
;
547 struct omap_sr
*sr
= _sr_lookup(voltdm
);
551 pr_warning("%s: omap_sr struct for sr_%s not found\n",
552 __func__
, voltdm
->name
);
556 volt_data
= omap_voltage_get_voltdata(sr
->voltdm
, volt
);
558 if (IS_ERR(volt_data
)) {
559 dev_warn(&sr
->pdev
->dev
, "%s: Unable to get voltage table"
560 "for nominal voltage %ld\n", __func__
, volt
);
564 nvalue_reciprocal
= sr_retrieve_nvalue(sr
, volt_data
->sr_efuse_offs
);
566 if (!nvalue_reciprocal
) {
567 dev_warn(&sr
->pdev
->dev
, "%s: NVALUE = 0 at voltage %ld\n",
572 /* errminlimit is opp dependent and hence linked to voltage */
573 sr
->err_minlimit
= volt_data
->sr_errminlimit
;
575 pm_runtime_get_sync(&sr
->pdev
->dev
);
577 /* Check if SR is already enabled. If yes do nothing */
578 if (sr_read_reg(sr
, SRCONFIG
) & SRCONFIG_SRENABLE
)
582 ret
= sr_class
->configure(voltdm
);
586 sr_write_reg(sr
, NVALUERECIPROCAL
, nvalue_reciprocal
);
588 /* SRCONFIG - enable SR */
589 sr_modify_reg(sr
, SRCONFIG
, SRCONFIG_SRENABLE
, SRCONFIG_SRENABLE
);
594 * sr_disable() - Disables the smartreflex module.
595 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
597 * This API is to be called from the smartreflex class driver to
598 * disable a smartreflex module.
600 void sr_disable(struct voltagedomain
*voltdm
)
602 struct omap_sr
*sr
= _sr_lookup(voltdm
);
605 pr_warning("%s: omap_sr struct for sr_%s not found\n",
606 __func__
, voltdm
->name
);
610 /* Check if SR clocks are already disabled. If yes do nothing */
611 if (pm_runtime_suspended(&sr
->pdev
->dev
))
615 * Disable SR if only it is indeed enabled. Else just
616 * disable the clocks.
618 if (sr_read_reg(sr
, SRCONFIG
) & SRCONFIG_SRENABLE
) {
619 if (sr
->ip_type
== SR_TYPE_V1
)
621 else if (sr
->ip_type
== SR_TYPE_V2
)
625 pm_runtime_put_sync(&sr
->pdev
->dev
);
629 * sr_register_class() - API to register a smartreflex class parameters.
630 * @class_data: The structure containing various sr class specific data.
632 * This API is to be called by the smartreflex class driver to register itself
633 * with the smartreflex driver during init. Returns 0 on success else the
636 int sr_register_class(struct omap_sr_class_data
*class_data
)
638 struct omap_sr
*sr_info
;
641 pr_warning("%s:, Smartreflex class data passed is NULL\n",
647 pr_warning("%s: Smartreflex class driver already registered\n",
652 sr_class
= class_data
;
655 * Call into late init to do intializations that require
656 * both sr driver and sr class driver to be initiallized.
658 list_for_each_entry(sr_info
, &sr_list
, node
)
659 sr_late_init(sr_info
);
665 * omap_sr_enable() - API to enable SR clocks and to call into the
666 * registered smartreflex class enable API.
667 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
669 * This API is to be called from the kernel in order to enable
670 * a particular smartreflex module. This API will do the initial
671 * configurations to turn on the smartreflex module and in turn call
672 * into the registered smartreflex class enable API.
674 void omap_sr_enable(struct voltagedomain
*voltdm
)
676 struct omap_sr
*sr
= _sr_lookup(voltdm
);
679 pr_warning("%s: omap_sr struct for sr_%s not found\n",
680 __func__
, voltdm
->name
);
684 if (!sr
->autocomp_active
)
687 if (!sr_class
|| !(sr_class
->enable
) || !(sr_class
->configure
)) {
688 dev_warn(&sr
->pdev
->dev
, "%s: smartreflex class driver not"
689 "registered\n", __func__
);
693 sr_class
->enable(voltdm
);
697 * omap_sr_disable() - API to disable SR without resetting the voltage
699 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
701 * This API is to be called from the kernel in order to disable
702 * a particular smartreflex module. This API will in turn call
703 * into the registered smartreflex class disable API. This API will tell
704 * the smartreflex class disable not to reset the VP voltage after
705 * disabling smartreflex.
707 void omap_sr_disable(struct voltagedomain
*voltdm
)
709 struct omap_sr
*sr
= _sr_lookup(voltdm
);
712 pr_warning("%s: omap_sr struct for sr_%s not found\n",
713 __func__
, voltdm
->name
);
717 if (!sr
->autocomp_active
)
720 if (!sr_class
|| !(sr_class
->disable
)) {
721 dev_warn(&sr
->pdev
->dev
, "%s: smartreflex class driver not"
722 "registered\n", __func__
);
726 sr_class
->disable(voltdm
, 0);
730 * omap_sr_disable_reset_volt() - API to disable SR and reset the
731 * voltage processor voltage
732 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
734 * This API is to be called from the kernel in order to disable
735 * a particular smartreflex module. This API will in turn call
736 * into the registered smartreflex class disable API. This API will tell
737 * the smartreflex class disable to reset the VP voltage after
738 * disabling smartreflex.
740 void omap_sr_disable_reset_volt(struct voltagedomain
*voltdm
)
742 struct omap_sr
*sr
= _sr_lookup(voltdm
);
745 pr_warning("%s: omap_sr struct for sr_%s not found\n",
746 __func__
, voltdm
->name
);
750 if (!sr
->autocomp_active
)
753 if (!sr_class
|| !(sr_class
->disable
)) {
754 dev_warn(&sr
->pdev
->dev
, "%s: smartreflex class driver not"
755 "registered\n", __func__
);
759 sr_class
->disable(voltdm
, 1);
763 * omap_sr_register_pmic() - API to register pmic specific info.
764 * @pmic_data: The structure containing pmic specific data.
766 * This API is to be called from the PMIC specific code to register with
767 * smartreflex driver pmic specific info. Currently the only info required
768 * is the smartreflex init on the PMIC side.
770 void omap_sr_register_pmic(struct omap_sr_pmic_data
*pmic_data
)
773 pr_warning("%s: Trying to register NULL PMIC data structure"
774 "with smartreflex\n", __func__
);
778 sr_pmic_data
= pmic_data
;
781 /* PM Debug Fs enteries to enable disable smartreflex. */
782 static int omap_sr_autocomp_show(void *data
, u64
*val
)
784 struct omap_sr
*sr_info
= (struct omap_sr
*) data
;
787 pr_warning("%s: omap_sr struct not found\n", __func__
);
791 *val
= sr_info
->autocomp_active
;
796 static int omap_sr_autocomp_store(void *data
, u64 val
)
798 struct omap_sr
*sr_info
= (struct omap_sr
*) data
;
801 pr_warning("%s: omap_sr struct not found\n", __func__
);
806 if (val
&& (val
!= 1)) {
807 pr_warning("%s: Invalid argument %lld\n", __func__
, val
);
812 sr_stop_vddautocomp(sr_info
);
814 sr_start_vddautocomp(sr_info
);
819 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops
, omap_sr_autocomp_show
,
820 omap_sr_autocomp_store
, "%llu\n");
822 static int __init
omap_sr_probe(struct platform_device
*pdev
)
824 struct omap_sr
*sr_info
= kzalloc(sizeof(struct omap_sr
), GFP_KERNEL
);
825 struct omap_sr_data
*pdata
= pdev
->dev
.platform_data
;
826 struct resource
*mem
, *irq
;
827 struct dentry
*vdd_dbg_dir
, *nvalue_dir
;
828 struct omap_volt_data
*volt_data
;
832 dev_err(&pdev
->dev
, "%s: unable to allocate sr_info\n",
838 dev_err(&pdev
->dev
, "%s: platform data missing\n", __func__
);
840 goto err_free_devinfo
;
843 mem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
845 dev_err(&pdev
->dev
, "%s: no mem resource\n", __func__
);
847 goto err_free_devinfo
;
850 mem
= request_mem_region(mem
->start
, resource_size(mem
),
851 dev_name(&pdev
->dev
));
853 dev_err(&pdev
->dev
, "%s: no mem region\n", __func__
);
855 goto err_free_devinfo
;
858 irq
= platform_get_resource(pdev
, IORESOURCE_IRQ
, 0);
860 pm_runtime_enable(&pdev
->dev
);
862 sr_info
->pdev
= pdev
;
863 sr_info
->srid
= pdev
->id
;
864 sr_info
->voltdm
= pdata
->voltdm
;
865 sr_info
->nvalue_table
= pdata
->nvalue_table
;
866 sr_info
->nvalue_count
= pdata
->nvalue_count
;
867 sr_info
->senn_mod
= pdata
->senn_mod
;
868 sr_info
->senp_mod
= pdata
->senp_mod
;
869 sr_info
->autocomp_active
= false;
870 sr_info
->ip_type
= pdata
->ip_type
;
871 sr_info
->base
= ioremap(mem
->start
, resource_size(mem
));
872 if (!sr_info
->base
) {
873 dev_err(&pdev
->dev
, "%s: ioremap fail\n", __func__
);
875 goto err_release_region
;
879 sr_info
->irq
= irq
->start
;
881 sr_set_clk_length(sr_info
);
882 sr_set_regfields(sr_info
);
884 list_add(&sr_info
->node
, &sr_list
);
887 * Call into late init to do intializations that require
888 * both sr driver and sr class driver to be initiallized.
891 ret
= sr_late_init(sr_info
);
893 pr_warning("%s: Error in SR late init\n", __func__
);
898 dev_info(&pdev
->dev
, "%s: SmartReflex driver initialized\n", __func__
);
901 * If the voltage domain debugfs directory is not created, do
902 * not try to create rest of the debugfs entries.
904 vdd_dbg_dir
= omap_voltage_get_dbgdir(sr_info
->voltdm
);
910 sr_info
->dbg_dir
= debugfs_create_dir("smartreflex", vdd_dbg_dir
);
911 if (IS_ERR(sr_info
->dbg_dir
)) {
912 dev_err(&pdev
->dev
, "%s: Unable to create debugfs directory\n",
914 ret
= PTR_ERR(sr_info
->dbg_dir
);
918 (void) debugfs_create_file("autocomp", S_IRUGO
| S_IWUSR
,
919 sr_info
->dbg_dir
, (void *)sr_info
, &pm_sr_fops
);
920 (void) debugfs_create_x32("errweight", S_IRUGO
, sr_info
->dbg_dir
,
921 &sr_info
->err_weight
);
922 (void) debugfs_create_x32("errmaxlimit", S_IRUGO
, sr_info
->dbg_dir
,
923 &sr_info
->err_maxlimit
);
924 (void) debugfs_create_x32("errminlimit", S_IRUGO
, sr_info
->dbg_dir
,
925 &sr_info
->err_minlimit
);
927 nvalue_dir
= debugfs_create_dir("nvalue", sr_info
->dbg_dir
);
928 if (IS_ERR(nvalue_dir
)) {
929 dev_err(&pdev
->dev
, "%s: Unable to create debugfs directory"
930 "for n-values\n", __func__
);
931 ret
= PTR_ERR(nvalue_dir
);
935 omap_voltage_get_volttable(sr_info
->voltdm
, &volt_data
);
937 dev_warn(&pdev
->dev
, "%s: No Voltage table for the"
938 " corresponding vdd vdd_%s. Cannot create debugfs"
939 "entries for n-values\n",
940 __func__
, sr_info
->voltdm
->name
);
945 for (i
= 0; i
< sr_info
->nvalue_count
; i
++) {
946 char name
[NVALUE_NAME_LEN
+ 1];
948 snprintf(name
, sizeof(name
), "volt_%d",
949 volt_data
[i
].volt_nominal
);
950 (void) debugfs_create_x32(name
, S_IRUGO
| S_IWUSR
, nvalue_dir
,
951 &(sr_info
->nvalue_table
[i
].nvalue
));
957 debugfs_remove_recursive(sr_info
->dbg_dir
);
959 list_del(&sr_info
->node
);
960 iounmap(sr_info
->base
);
962 release_mem_region(mem
->start
, resource_size(mem
));
969 static int __devexit
omap_sr_remove(struct platform_device
*pdev
)
971 struct omap_sr_data
*pdata
= pdev
->dev
.platform_data
;
972 struct omap_sr
*sr_info
;
973 struct resource
*mem
;
976 dev_err(&pdev
->dev
, "%s: platform data missing\n", __func__
);
980 sr_info
= _sr_lookup(pdata
->voltdm
);
981 if (IS_ERR(sr_info
)) {
982 dev_warn(&pdev
->dev
, "%s: omap_sr struct not found\n",
987 if (sr_info
->autocomp_active
)
988 sr_stop_vddautocomp(sr_info
);
989 if (sr_info
->dbg_dir
)
990 debugfs_remove_recursive(sr_info
->dbg_dir
);
992 list_del(&sr_info
->node
);
993 iounmap(sr_info
->base
);
995 mem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
996 release_mem_region(mem
->start
, resource_size(mem
));
1001 static struct platform_driver smartreflex_driver
= {
1002 .remove
= omap_sr_remove
,
1004 .name
= "smartreflex",
1008 static int __init
sr_init(void)
1013 * sr_init is a late init. If by then a pmic specific API is not
1014 * registered either there is no need for anything to be done on
1015 * the PMIC side or somebody has forgotten to register a PMIC
1016 * handler. Warn for the second condition.
1018 if (sr_pmic_data
&& sr_pmic_data
->sr_pmic_init
)
1019 sr_pmic_data
->sr_pmic_init();
1021 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__
);
1023 ret
= platform_driver_probe(&smartreflex_driver
, omap_sr_probe
);
1025 pr_err("%s: platform driver register failed for SR\n",
1033 static void __exit
sr_exit(void)
1035 platform_driver_unregister(&smartreflex_driver
);
1037 late_initcall(sr_init
);
1038 module_exit(sr_exit
);
1040 MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1041 MODULE_LICENSE("GPL");
1042 MODULE_ALIAS("platform:" DRIVER_NAME
);
1043 MODULE_AUTHOR("Texas Instruments Inc");