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 for sr_%s not found\n",
784 __func__
, sr_info
->voltdm
->name
);
788 *val
= sr_info
->autocomp_active
;
793 static int omap_sr_autocomp_store(void *data
, u64 val
)
795 struct omap_sr
*sr_info
= (struct omap_sr
*) data
;
798 pr_warning("%s: omap_sr struct for sr_%s not found\n",
799 __func__
, sr_info
->voltdm
->name
);
804 if (val
&& (val
!= 1)) {
805 pr_warning("%s: Invalid argument %lld\n", __func__
, val
);
810 sr_stop_vddautocomp(sr_info
);
812 sr_start_vddautocomp(sr_info
);
817 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops
, omap_sr_autocomp_show
,
818 omap_sr_autocomp_store
, "%llu\n");
820 static int __init
omap_sr_probe(struct platform_device
*pdev
)
822 struct omap_sr
*sr_info
= kzalloc(sizeof(struct omap_sr
), GFP_KERNEL
);
823 struct omap_sr_data
*pdata
= pdev
->dev
.platform_data
;
824 struct resource
*mem
, *irq
;
825 struct dentry
*vdd_dbg_dir
, *dbg_dir
, *nvalue_dir
;
826 struct omap_volt_data
*volt_data
;
830 dev_err(&pdev
->dev
, "%s: unable to allocate sr_info\n",
836 dev_err(&pdev
->dev
, "%s: platform data missing\n", __func__
);
840 mem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
842 dev_err(&pdev
->dev
, "%s: no mem resource\n", __func__
);
844 goto err_free_devinfo
;
847 irq
= platform_get_resource(pdev
, IORESOURCE_IRQ
, 0);
849 pm_runtime_enable(&pdev
->dev
);
851 sr_info
->pdev
= pdev
;
852 sr_info
->srid
= pdev
->id
;
853 sr_info
->voltdm
= pdata
->voltdm
;
854 sr_info
->nvalue_table
= pdata
->nvalue_table
;
855 sr_info
->nvalue_count
= pdata
->nvalue_count
;
856 sr_info
->senn_mod
= pdata
->senn_mod
;
857 sr_info
->senp_mod
= pdata
->senp_mod
;
858 sr_info
->autocomp_active
= false;
859 sr_info
->ip_type
= pdata
->ip_type
;
860 sr_info
->base
= ioremap(mem
->start
, resource_size(mem
));
861 if (!sr_info
->base
) {
862 dev_err(&pdev
->dev
, "%s: ioremap fail\n", __func__
);
864 goto err_release_region
;
868 sr_info
->irq
= irq
->start
;
870 sr_set_clk_length(sr_info
);
871 sr_set_regfields(sr_info
);
873 list_add(&sr_info
->node
, &sr_list
);
876 * Call into late init to do intializations that require
877 * both sr driver and sr class driver to be initiallized.
880 ret
= sr_late_init(sr_info
);
882 pr_warning("%s: Error in SR late init\n", __func__
);
887 dev_info(&pdev
->dev
, "%s: SmartReflex driver initialized\n", __func__
);
890 * If the voltage domain debugfs directory is not created, do
891 * not try to create rest of the debugfs entries.
893 vdd_dbg_dir
= omap_voltage_get_dbgdir(sr_info
->voltdm
);
897 dbg_dir
= debugfs_create_dir("smartreflex", vdd_dbg_dir
);
898 if (IS_ERR(dbg_dir
)) {
899 dev_err(&pdev
->dev
, "%s: Unable to create debugfs directory\n",
901 return PTR_ERR(dbg_dir
);
904 (void) debugfs_create_file("autocomp", S_IRUGO
| S_IWUGO
, dbg_dir
,
905 (void *)sr_info
, &pm_sr_fops
);
906 (void) debugfs_create_x32("errweight", S_IRUGO
, dbg_dir
,
907 &sr_info
->err_weight
);
908 (void) debugfs_create_x32("errmaxlimit", S_IRUGO
, dbg_dir
,
909 &sr_info
->err_maxlimit
);
910 (void) debugfs_create_x32("errminlimit", S_IRUGO
, dbg_dir
,
911 &sr_info
->err_minlimit
);
913 nvalue_dir
= debugfs_create_dir("nvalue", dbg_dir
);
914 if (IS_ERR(nvalue_dir
)) {
915 dev_err(&pdev
->dev
, "%s: Unable to create debugfs directory"
916 "for n-values\n", __func__
);
917 return PTR_ERR(nvalue_dir
);
920 omap_voltage_get_volttable(sr_info
->voltdm
, &volt_data
);
922 dev_warn(&pdev
->dev
, "%s: No Voltage table for the"
923 " corresponding vdd vdd_%s. Cannot create debugfs"
924 "entries for n-values\n",
925 __func__
, sr_info
->voltdm
->name
);
929 for (i
= 0; i
< sr_info
->nvalue_count
; i
++) {
933 name
= kzalloc(NVALUE_NAME_LEN
+ 1, GFP_KERNEL
);
935 dev_err(&pdev
->dev
, "%s: Unable to allocate memory"
936 " for n-value directory name\n", __func__
);
940 strcpy(name
, "volt_");
941 sprintf(volt_name
, "%d", volt_data
[i
].volt_nominal
);
942 strcat(name
, volt_name
);
943 (void) debugfs_create_x32(name
, S_IRUGO
| S_IWUGO
, nvalue_dir
,
944 &(sr_info
->nvalue_table
[i
].nvalue
));
950 release_mem_region(mem
->start
, resource_size(mem
));
957 static int __devexit
omap_sr_remove(struct platform_device
*pdev
)
959 struct omap_sr_data
*pdata
= pdev
->dev
.platform_data
;
960 struct omap_sr
*sr_info
;
961 struct resource
*mem
;
964 dev_err(&pdev
->dev
, "%s: platform data missing\n", __func__
);
968 sr_info
= _sr_lookup(pdata
->voltdm
);
970 dev_warn(&pdev
->dev
, "%s: omap_sr struct not found\n",
975 if (sr_info
->autocomp_active
)
976 sr_stop_vddautocomp(sr_info
);
978 list_del(&sr_info
->node
);
979 iounmap(sr_info
->base
);
981 mem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
982 release_mem_region(mem
->start
, resource_size(mem
));
987 static struct platform_driver smartreflex_driver
= {
988 .remove
= omap_sr_remove
,
990 .name
= "smartreflex",
994 static int __init
sr_init(void)
999 * sr_init is a late init. If by then a pmic specific API is not
1000 * registered either there is no need for anything to be done on
1001 * the PMIC side or somebody has forgotten to register a PMIC
1002 * handler. Warn for the second condition.
1004 if (sr_pmic_data
&& sr_pmic_data
->sr_pmic_init
)
1005 sr_pmic_data
->sr_pmic_init();
1007 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__
);
1009 ret
= platform_driver_probe(&smartreflex_driver
, omap_sr_probe
);
1011 pr_err("%s: platform driver register failed for SR\n",
1019 static void __exit
sr_exit(void)
1021 platform_driver_unregister(&smartreflex_driver
);
1023 late_initcall(sr_init
);
1024 module_exit(sr_exit
);
1026 MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1027 MODULE_LICENSE("GPL");
1028 MODULE_ALIAS("platform:" DRIVER_NAME
);
1029 MODULE_AUTHOR("Texas Instruments Inc");