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>
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");