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-rw-r--r--drivers/power/avs/Kconfig12
-rw-r--r--drivers/power/avs/Makefile1
-rw-r--r--drivers/power/avs/smartreflex.c1126
3 files changed, 1139 insertions, 0 deletions
diff --git a/drivers/power/avs/Kconfig b/drivers/power/avs/Kconfig
new file mode 100644
index 000000000000..2a1008b61121
--- /dev/null
+++ b/drivers/power/avs/Kconfig
@@ -0,0 +1,12 @@
1menuconfig POWER_AVS
2 bool "Adaptive Voltage Scaling class support"
3 help
4 AVS is a power management technique which finely controls the
5 operating voltage of a device in order to optimize (i.e. reduce)
6 its power consumption.
7 At a given operating point the voltage is adapted depending on
8 static factors (chip manufacturing process) and dynamic factors
9 (temperature depending performance).
10 AVS is also called SmartReflex on OMAP devices.
11
12 Say Y here to enable Adaptive Voltage Scaling class support.
diff --git a/drivers/power/avs/Makefile b/drivers/power/avs/Makefile
new file mode 100644
index 000000000000..0843386a6c19
--- /dev/null
+++ b/drivers/power/avs/Makefile
@@ -0,0 +1 @@
obj-$(CONFIG_POWER_AVS_OMAP) += smartreflex.o
diff --git a/drivers/power/avs/smartreflex.c b/drivers/power/avs/smartreflex.c
new file mode 100644
index 000000000000..44efc6e202af
--- /dev/null
+++ b/drivers/power/avs/smartreflex.c
@@ -0,0 +1,1126 @@
1/*
2 * OMAP SmartReflex Voltage Control
3 *
4 * Author: Thara Gopinath <thara@ti.com>
5 *
6 * Copyright (C) 2012 Texas Instruments, Inc.
7 * Thara Gopinath <thara@ti.com>
8 *
9 * Copyright (C) 2008 Nokia Corporation
10 * Kalle Jokiniemi
11 *
12 * Copyright (C) 2007 Texas Instruments, Inc.
13 * Lesly A M <x0080970@ti.com>
14 *
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.
18 */
19
20#include <linux/module.h>
21#include <linux/interrupt.h>
22#include <linux/clk.h>
23#include <linux/io.h>
24#include <linux/debugfs.h>
25#include <linux/delay.h>
26#include <linux/slab.h>
27#include <linux/pm_runtime.h>
28#include <linux/power/smartreflex.h>
29
30#define SMARTREFLEX_NAME_LEN 16
31#define NVALUE_NAME_LEN 40
32#define SR_DISABLE_TIMEOUT 200
33
34/* sr_list contains all the instances of smartreflex module */
35static LIST_HEAD(sr_list);
36
37static struct omap_sr_class_data *sr_class;
38static struct omap_sr_pmic_data *sr_pmic_data;
39static struct dentry *sr_dbg_dir;
40
41static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
42{
43 __raw_writel(value, (sr->base + offset));
44}
45
46static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,
47 u32 value)
48{
49 u32 reg_val;
50
51 /*
52 * Smartreflex error config register is special as it contains
53 * certain status bits which if written a 1 into means a clear
54 * of those bits. So in order to make sure no accidental write of
55 * 1 happens to those status bits, do a clear of them in the read
56 * value. This mean this API doesn't rewrite values in these bits
57 * if they are currently set, but does allow the caller to write
58 * those bits.
59 */
60 if (sr->ip_type == SR_TYPE_V1 && offset == ERRCONFIG_V1)
61 mask |= ERRCONFIG_STATUS_V1_MASK;
62 else if (sr->ip_type == SR_TYPE_V2 && offset == ERRCONFIG_V2)
63 mask |= ERRCONFIG_VPBOUNDINTST_V2;
64
65 reg_val = __raw_readl(sr->base + offset);
66 reg_val &= ~mask;
67
68 value &= mask;
69
70 reg_val |= value;
71
72 __raw_writel(reg_val, (sr->base + offset));
73}
74
75static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
76{
77 return __raw_readl(sr->base + offset);
78}
79
80static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm)
81{
82 struct omap_sr *sr_info;
83
84 if (!voltdm) {
85 pr_err("%s: Null voltage domain passed!\n", __func__);
86 return ERR_PTR(-EINVAL);
87 }
88
89 list_for_each_entry(sr_info, &sr_list, node) {
90 if (voltdm == sr_info->voltdm)
91 return sr_info;
92 }
93
94 return ERR_PTR(-ENODATA);
95}
96
97static irqreturn_t sr_interrupt(int irq, void *data)
98{
99 struct omap_sr *sr_info = data;
100 u32 status = 0;
101
102 switch (sr_info->ip_type) {
103 case SR_TYPE_V1:
104 /* Read the status bits */
105 status = sr_read_reg(sr_info, ERRCONFIG_V1);
106
107 /* Clear them by writing back */
108 sr_write_reg(sr_info, ERRCONFIG_V1, status);
109 break;
110 case SR_TYPE_V2:
111 /* Read the status bits */
112 status = sr_read_reg(sr_info, IRQSTATUS);
113
114 /* Clear them by writing back */
115 sr_write_reg(sr_info, IRQSTATUS, status);
116 break;
117 default:
118 dev_err(&sr_info->pdev->dev, "UNKNOWN IP type %d\n",
119 sr_info->ip_type);
120 return IRQ_NONE;
121 }
122
123 if (sr_class->notify)
124 sr_class->notify(sr_info, status);
125
126 return IRQ_HANDLED;
127}
128
129static void sr_set_clk_length(struct omap_sr *sr)
130{
131 struct clk *sys_ck;
132 u32 sys_clk_speed;
133
134 if (cpu_is_omap34xx())
135 sys_ck = clk_get(NULL, "sys_ck");
136 else
137 sys_ck = clk_get(NULL, "sys_clkin_ck");
138
139 if (IS_ERR(sys_ck)) {
140 dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n",
141 __func__);
142 return;
143 }
144
145 sys_clk_speed = clk_get_rate(sys_ck);
146 clk_put(sys_ck);
147
148 switch (sys_clk_speed) {
149 case 12000000:
150 sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK;
151 break;
152 case 13000000:
153 sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK;
154 break;
155 case 19200000:
156 sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK;
157 break;
158 case 26000000:
159 sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK;
160 break;
161 case 38400000:
162 sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK;
163 break;
164 default:
165 dev_err(&sr->pdev->dev, "%s: Invalid sysclk value: %d\n",
166 __func__, sys_clk_speed);
167 break;
168 }
169}
170
171static void sr_set_regfields(struct omap_sr *sr)
172{
173 /*
174 * For time being these values are defined in smartreflex.h
175 * and populated during init. May be they can be moved to board
176 * file or pmic specific data structure. In that case these structure
177 * fields will have to be populated using the pdata or pmic structure.
178 */
179 if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
180 sr->err_weight = OMAP3430_SR_ERRWEIGHT;
181 sr->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
182 sr->accum_data = OMAP3430_SR_ACCUMDATA;
183 if (!(strcmp(sr->name, "smartreflex_mpu_iva"))) {
184 sr->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
185 sr->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
186 } else {
187 sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
188 sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
189 }
190 }
191}
192
193static void sr_start_vddautocomp(struct omap_sr *sr)
194{
195 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
196 dev_warn(&sr->pdev->dev,
197 "%s: smartreflex class driver not registered\n",
198 __func__);
199 return;
200 }
201
202 if (!sr_class->enable(sr))
203 sr->autocomp_active = true;
204}
205
206static void sr_stop_vddautocomp(struct omap_sr *sr)
207{
208 if (!sr_class || !(sr_class->disable)) {
209 dev_warn(&sr->pdev->dev,
210 "%s: smartreflex class driver not registered\n",
211 __func__);
212 return;
213 }
214
215 if (sr->autocomp_active) {
216 sr_class->disable(sr, 1);
217 sr->autocomp_active = false;
218 }
219}
220
221/*
222 * This function handles the intializations which have to be done
223 * only when both sr device and class driver regiter has
224 * completed. This will be attempted to be called from both sr class
225 * driver register and sr device intializtion API's. Only one call
226 * will ultimately succeed.
227 *
228 * Currently this function registers interrupt handler for a particular SR
229 * if smartreflex class driver is already registered and has
230 * requested for interrupts and the SR interrupt line in present.
231 */
232static int sr_late_init(struct omap_sr *sr_info)
233{
234 struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data;
235 struct resource *mem;
236 int ret = 0;
237
238 if (sr_class->notify && sr_class->notify_flags && sr_info->irq) {
239 ret = request_irq(sr_info->irq, sr_interrupt,
240 0, sr_info->name, sr_info);
241 if (ret)
242 goto error;
243 disable_irq(sr_info->irq);
244 }
245
246 if (pdata && pdata->enable_on_init)
247 sr_start_vddautocomp(sr_info);
248
249 return ret;
250
251error:
252 iounmap(sr_info->base);
253 mem = platform_get_resource(sr_info->pdev, IORESOURCE_MEM, 0);
254 release_mem_region(mem->start, resource_size(mem));
255 list_del(&sr_info->node);
256 dev_err(&sr_info->pdev->dev, "%s: ERROR in registering"
257 "interrupt handler. Smartreflex will"
258 "not function as desired\n", __func__);
259 kfree(sr_info);
260
261 return ret;
262}
263
264static void sr_v1_disable(struct omap_sr *sr)
265{
266 int timeout = 0;
267 int errconf_val = ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
268 ERRCONFIG_MCUBOUNDINTST;
269
270 /* Enable MCUDisableAcknowledge interrupt */
271 sr_modify_reg(sr, ERRCONFIG_V1,
272 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
273
274 /* SRCONFIG - disable SR */
275 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
276
277 /* Disable all other SR interrupts and clear the status as needed */
278 if (sr_read_reg(sr, ERRCONFIG_V1) & ERRCONFIG_VPBOUNDINTST_V1)
279 errconf_val |= ERRCONFIG_VPBOUNDINTST_V1;
280 sr_modify_reg(sr, ERRCONFIG_V1,
281 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
282 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),
283 errconf_val);
284
285 /*
286 * Wait for SR to be disabled.
287 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
288 */
289 sr_test_cond_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
290 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
291 timeout);
292
293 if (timeout >= SR_DISABLE_TIMEOUT)
294 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
295 __func__);
296
297 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
298 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
299 ERRCONFIG_MCUDISACKINTST);
300}
301
302static void sr_v2_disable(struct omap_sr *sr)
303{
304 int timeout = 0;
305
306 /* Enable MCUDisableAcknowledge interrupt */
307 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
308
309 /* SRCONFIG - disable SR */
310 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
311
312 /*
313 * Disable all other SR interrupts and clear the status
314 * write to status register ONLY on need basis - only if status
315 * is set.
316 */
317 if (sr_read_reg(sr, ERRCONFIG_V2) & ERRCONFIG_VPBOUNDINTST_V2)
318 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
319 ERRCONFIG_VPBOUNDINTST_V2);
320 else
321 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
322 0x0);
323 sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |
324 IRQENABLE_MCUVALIDINT |
325 IRQENABLE_MCUBOUNDSINT));
326 sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |
327 IRQSTATUS_MCVALIDINT |
328 IRQSTATUS_MCBOUNDSINT));
329
330 /*
331 * Wait for SR to be disabled.
332 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
333 */
334 sr_test_cond_timeout((sr_read_reg(sr, IRQSTATUS) &
335 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
336 timeout);
337
338 if (timeout >= SR_DISABLE_TIMEOUT)
339 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
340 __func__);
341
342 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
343 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
344 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
345}
346
347static struct omap_sr_nvalue_table *sr_retrieve_nvalue_row(
348 struct omap_sr *sr, u32 efuse_offs)
349{
350 int i;
351
352 if (!sr->nvalue_table) {
353 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",
354 __func__);
355 return NULL;
356 }
357
358 for (i = 0; i < sr->nvalue_count; i++) {
359 if (sr->nvalue_table[i].efuse_offs == efuse_offs)
360 return &sr->nvalue_table[i];
361 }
362
363 return NULL;
364}
365
366/* Public Functions */
367
368/**
369 * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
370 * error generator module.
371 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
372 *
373 * This API is to be called from the smartreflex class driver to
374 * configure the error generator module inside the smartreflex module.
375 * SR settings if using the ERROR module inside Smartreflex.
376 * SR CLASS 3 by default uses only the ERROR module where as
377 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
378 * module. Returns 0 on success and error value in case of failure.
379 */
380int sr_configure_errgen(struct voltagedomain *voltdm)
381{
382 u32 sr_config, sr_errconfig, errconfig_offs;
383 u32 vpboundint_en, vpboundint_st;
384 u32 senp_en = 0, senn_en = 0;
385 u8 senp_shift, senn_shift;
386 struct omap_sr *sr = _sr_lookup(voltdm);
387
388 if (IS_ERR(sr)) {
389 pr_warning("%s: omap_sr struct for voltdm not found\n", __func__);
390 return PTR_ERR(sr);
391 }
392
393 if (!sr->clk_length)
394 sr_set_clk_length(sr);
395
396 senp_en = sr->senp_mod;
397 senn_en = sr->senn_mod;
398
399 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
400 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
401
402 switch (sr->ip_type) {
403 case SR_TYPE_V1:
404 sr_config |= SRCONFIG_DELAYCTRL;
405 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
406 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
407 errconfig_offs = ERRCONFIG_V1;
408 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
409 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
410 break;
411 case SR_TYPE_V2:
412 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
413 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
414 errconfig_offs = ERRCONFIG_V2;
415 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
416 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
417 break;
418 default:
419 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
420 "module without specifying the ip\n", __func__);
421 return -EINVAL;
422 }
423
424 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
425 sr_write_reg(sr, SRCONFIG, sr_config);
426 sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |
427 (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |
428 (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);
429 sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |
430 SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),
431 sr_errconfig);
432
433 /* Enabling the interrupts if the ERROR module is used */
434 sr_modify_reg(sr, errconfig_offs, (vpboundint_en | vpboundint_st),
435 vpboundint_en);
436
437 return 0;
438}
439
440/**
441 * sr_disable_errgen() - Disables SmartReflex AVS module's errgen component
442 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
443 *
444 * This API is to be called from the smartreflex class driver to
445 * disable the error generator module inside the smartreflex module.
446 *
447 * Returns 0 on success and error value in case of failure.
448 */
449int sr_disable_errgen(struct voltagedomain *voltdm)
450{
451 u32 errconfig_offs;
452 u32 vpboundint_en, vpboundint_st;
453 struct omap_sr *sr = _sr_lookup(voltdm);
454
455 if (IS_ERR(sr)) {
456 pr_warning("%s: omap_sr struct for voltdm not found\n", __func__);
457 return PTR_ERR(sr);
458 }
459
460 switch (sr->ip_type) {
461 case SR_TYPE_V1:
462 errconfig_offs = ERRCONFIG_V1;
463 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
464 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
465 break;
466 case SR_TYPE_V2:
467 errconfig_offs = ERRCONFIG_V2;
468 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
469 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
470 break;
471 default:
472 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
473 "module without specifying the ip\n", __func__);
474 return -EINVAL;
475 }
476
477 /* Disable the interrupts of ERROR module */
478 sr_modify_reg(sr, errconfig_offs, vpboundint_en | vpboundint_st, 0);
479
480 /* Disable the Sensor and errorgen */
481 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN, 0);
482
483 return 0;
484}
485
486/**
487 * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
488 * minmaxavg module.
489 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
490 *
491 * This API is to be called from the smartreflex class driver to
492 * configure the minmaxavg module inside the smartreflex module.
493 * SR settings if using the ERROR module inside Smartreflex.
494 * SR CLASS 3 by default uses only the ERROR module where as
495 * SR CLASS 2 can choose between ERROR module and MINMAXAVG
496 * module. Returns 0 on success and error value in case of failure.
497 */
498int sr_configure_minmax(struct voltagedomain *voltdm)
499{
500 u32 sr_config, sr_avgwt;
501 u32 senp_en = 0, senn_en = 0;
502 u8 senp_shift, senn_shift;
503 struct omap_sr *sr = _sr_lookup(voltdm);
504
505 if (IS_ERR(sr)) {
506 pr_warning("%s: omap_sr struct for voltdm not found\n", __func__);
507 return PTR_ERR(sr);
508 }
509
510 if (!sr->clk_length)
511 sr_set_clk_length(sr);
512
513 senp_en = sr->senp_mod;
514 senn_en = sr->senn_mod;
515
516 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
517 SRCONFIG_SENENABLE |
518 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
519
520 switch (sr->ip_type) {
521 case SR_TYPE_V1:
522 sr_config |= SRCONFIG_DELAYCTRL;
523 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
524 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
525 break;
526 case SR_TYPE_V2:
527 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
528 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
529 break;
530 default:
531 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
532 "module without specifying the ip\n", __func__);
533 return -EINVAL;
534 }
535
536 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
537 sr_write_reg(sr, SRCONFIG, sr_config);
538 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
539 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
540 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
541
542 /*
543 * Enabling the interrupts if MINMAXAVG module is used.
544 * TODO: check if all the interrupts are mandatory
545 */
546 switch (sr->ip_type) {
547 case SR_TYPE_V1:
548 sr_modify_reg(sr, ERRCONFIG_V1,
549 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
550 ERRCONFIG_MCUBOUNDINTEN),
551 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
552 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
553 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
554 break;
555 case SR_TYPE_V2:
556 sr_write_reg(sr, IRQSTATUS,
557 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
558 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
559 sr_write_reg(sr, IRQENABLE_SET,
560 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
561 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
562 break;
563 default:
564 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
565 "module without specifying the ip\n", __func__);
566 return -EINVAL;
567 }
568
569 return 0;
570}
571
572/**
573 * sr_enable() - Enables the smartreflex module.
574 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
575 * @volt: The voltage at which the Voltage domain associated with
576 * the smartreflex module is operating at.
577 * This is required only to program the correct Ntarget value.
578 *
579 * This API is to be called from the smartreflex class driver to
580 * enable a smartreflex module. Returns 0 on success. Returns error
581 * value if the voltage passed is wrong or if ntarget value is wrong.
582 */
583int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
584{
585 struct omap_volt_data *volt_data;
586 struct omap_sr *sr = _sr_lookup(voltdm);
587 struct omap_sr_nvalue_table *nvalue_row;
588 int ret;
589
590 if (IS_ERR(sr)) {
591 pr_warning("%s: omap_sr struct for voltdm not found\n", __func__);
592 return PTR_ERR(sr);
593 }
594
595 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
596
597 if (IS_ERR(volt_data)) {
598 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
599 "for nominal voltage %ld\n", __func__, volt);
600 return PTR_ERR(volt_data);
601 }
602
603 nvalue_row = sr_retrieve_nvalue_row(sr, volt_data->sr_efuse_offs);
604
605 if (!nvalue_row) {
606 dev_warn(&sr->pdev->dev, "%s: failure getting SR data for this voltage %ld\n",
607 __func__, volt);
608 return -ENODATA;
609 }
610
611 /* errminlimit is opp dependent and hence linked to voltage */
612 sr->err_minlimit = nvalue_row->errminlimit;
613
614 pm_runtime_get_sync(&sr->pdev->dev);
615
616 /* Check if SR is already enabled. If yes do nothing */
617 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
618 return 0;
619
620 /* Configure SR */
621 ret = sr_class->configure(sr);
622 if (ret)
623 return ret;
624
625 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_row->nvalue);
626
627 /* SRCONFIG - enable SR */
628 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
629 return 0;
630}
631
632/**
633 * sr_disable() - Disables the smartreflex module.
634 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
635 *
636 * This API is to be called from the smartreflex class driver to
637 * disable a smartreflex module.
638 */
639void sr_disable(struct voltagedomain *voltdm)
640{
641 struct omap_sr *sr = _sr_lookup(voltdm);
642
643 if (IS_ERR(sr)) {
644 pr_warning("%s: omap_sr struct for voltdm not found\n", __func__);
645 return;
646 }
647
648 /* Check if SR clocks are already disabled. If yes do nothing */
649 if (pm_runtime_suspended(&sr->pdev->dev))
650 return;
651
652 /*
653 * Disable SR if only it is indeed enabled. Else just
654 * disable the clocks.
655 */
656 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
657 switch (sr->ip_type) {
658 case SR_TYPE_V1:
659 sr_v1_disable(sr);
660 break;
661 case SR_TYPE_V2:
662 sr_v2_disable(sr);
663 break;
664 default:
665 dev_err(&sr->pdev->dev, "UNKNOWN IP type %d\n",
666 sr->ip_type);
667 }
668 }
669
670 pm_runtime_put_sync_suspend(&sr->pdev->dev);
671}
672
673/**
674 * sr_register_class() - API to register a smartreflex class parameters.
675 * @class_data: The structure containing various sr class specific data.
676 *
677 * This API is to be called by the smartreflex class driver to register itself
678 * with the smartreflex driver during init. Returns 0 on success else the
679 * error value.
680 */
681int sr_register_class(struct omap_sr_class_data *class_data)
682{
683 struct omap_sr *sr_info;
684
685 if (!class_data) {
686 pr_warning("%s:, Smartreflex class data passed is NULL\n",
687 __func__);
688 return -EINVAL;
689 }
690
691 if (sr_class) {
692 pr_warning("%s: Smartreflex class driver already registered\n",
693 __func__);
694 return -EBUSY;
695 }
696
697 sr_class = class_data;
698
699 /*
700 * Call into late init to do intializations that require
701 * both sr driver and sr class driver to be initiallized.
702 */
703 list_for_each_entry(sr_info, &sr_list, node)
704 sr_late_init(sr_info);
705
706 return 0;
707}
708
709/**
710 * omap_sr_enable() - API to enable SR clocks and to call into the
711 * registered smartreflex class enable API.
712 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
713 *
714 * This API is to be called from the kernel in order to enable
715 * a particular smartreflex module. This API will do the initial
716 * configurations to turn on the smartreflex module and in turn call
717 * into the registered smartreflex class enable API.
718 */
719void omap_sr_enable(struct voltagedomain *voltdm)
720{
721 struct omap_sr *sr = _sr_lookup(voltdm);
722
723 if (IS_ERR(sr)) {
724 pr_warning("%s: omap_sr struct for voltdm not found\n", __func__);
725 return;
726 }
727
728 if (!sr->autocomp_active)
729 return;
730
731 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
732 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
733 "registered\n", __func__);
734 return;
735 }
736
737 sr_class->enable(sr);
738}
739
740/**
741 * omap_sr_disable() - API to disable SR without resetting the voltage
742 * processor voltage
743 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
744 *
745 * This API is to be called from the kernel in order to disable
746 * a particular smartreflex module. This API will in turn call
747 * into the registered smartreflex class disable API. This API will tell
748 * the smartreflex class disable not to reset the VP voltage after
749 * disabling smartreflex.
750 */
751void omap_sr_disable(struct voltagedomain *voltdm)
752{
753 struct omap_sr *sr = _sr_lookup(voltdm);
754
755 if (IS_ERR(sr)) {
756 pr_warning("%s: omap_sr struct for voltdm not found\n", __func__);
757 return;
758 }
759
760 if (!sr->autocomp_active)
761 return;
762
763 if (!sr_class || !(sr_class->disable)) {
764 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
765 "registered\n", __func__);
766 return;
767 }
768
769 sr_class->disable(sr, 0);
770}
771
772/**
773 * omap_sr_disable_reset_volt() - API to disable SR and reset the
774 * voltage processor voltage
775 * @voltdm: VDD pointer to which the SR module to be configured belongs to.
776 *
777 * This API is to be called from the kernel in order to disable
778 * a particular smartreflex module. This API will in turn call
779 * into the registered smartreflex class disable API. This API will tell
780 * the smartreflex class disable to reset the VP voltage after
781 * disabling smartreflex.
782 */
783void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
784{
785 struct omap_sr *sr = _sr_lookup(voltdm);
786
787 if (IS_ERR(sr)) {
788 pr_warning("%s: omap_sr struct for voltdm not found\n", __func__);
789 return;
790 }
791
792 if (!sr->autocomp_active)
793 return;
794
795 if (!sr_class || !(sr_class->disable)) {
796 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
797 "registered\n", __func__);
798 return;
799 }
800
801 sr_class->disable(sr, 1);
802}
803
804/**
805 * omap_sr_register_pmic() - API to register pmic specific info.
806 * @pmic_data: The structure containing pmic specific data.
807 *
808 * This API is to be called from the PMIC specific code to register with
809 * smartreflex driver pmic specific info. Currently the only info required
810 * is the smartreflex init on the PMIC side.
811 */
812void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
813{
814 if (!pmic_data) {
815 pr_warning("%s: Trying to register NULL PMIC data structure"
816 "with smartreflex\n", __func__);
817 return;
818 }
819
820 sr_pmic_data = pmic_data;
821}
822
823/* PM Debug FS entries to enable and disable smartreflex. */
824static int omap_sr_autocomp_show(void *data, u64 *val)
825{
826 struct omap_sr *sr_info = data;
827
828 if (!sr_info) {
829 pr_warning("%s: omap_sr struct not found\n", __func__);
830 return -EINVAL;
831 }
832
833 *val = sr_info->autocomp_active;
834
835 return 0;
836}
837
838static int omap_sr_autocomp_store(void *data, u64 val)
839{
840 struct omap_sr *sr_info = data;
841
842 if (!sr_info) {
843 pr_warning("%s: omap_sr struct not found\n", __func__);
844 return -EINVAL;
845 }
846
847 /* Sanity check */
848 if (val > 1) {
849 pr_warning("%s: Invalid argument %lld\n", __func__, val);
850 return -EINVAL;
851 }
852
853 /* control enable/disable only if there is a delta in value */
854 if (sr_info->autocomp_active != val) {
855 if (!val)
856 sr_stop_vddautocomp(sr_info);
857 else
858 sr_start_vddautocomp(sr_info);
859 }
860
861 return 0;
862}
863
864DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
865 omap_sr_autocomp_store, "%llu\n");
866
867static int __init omap_sr_probe(struct platform_device *pdev)
868{
869 struct omap_sr *sr_info;
870 struct omap_sr_data *pdata = pdev->dev.platform_data;
871 struct resource *mem, *irq;
872 struct dentry *nvalue_dir;
873 int i, ret = 0;
874
875 sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
876 if (!sr_info) {
877 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
878 __func__);
879 return -ENOMEM;
880 }
881
882 platform_set_drvdata(pdev, sr_info);
883
884 if (!pdata) {
885 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
886 ret = -EINVAL;
887 goto err_free_devinfo;
888 }
889
890 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
891 if (!mem) {
892 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
893 ret = -ENODEV;
894 goto err_free_devinfo;
895 }
896
897 mem = request_mem_region(mem->start, resource_size(mem),
898 dev_name(&pdev->dev));
899 if (!mem) {
900 dev_err(&pdev->dev, "%s: no mem region\n", __func__);
901 ret = -EBUSY;
902 goto err_free_devinfo;
903 }
904
905 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
906
907 pm_runtime_enable(&pdev->dev);
908 pm_runtime_irq_safe(&pdev->dev);
909
910 sr_info->name = kasprintf(GFP_KERNEL, "%s", pdata->name);
911 if (!sr_info->name) {
912 dev_err(&pdev->dev, "%s: Unable to alloc SR instance name\n",
913 __func__);
914 ret = -ENOMEM;
915 goto err_release_region;
916 }
917
918 sr_info->pdev = pdev;
919 sr_info->srid = pdev->id;
920 sr_info->voltdm = pdata->voltdm;
921 sr_info->nvalue_table = pdata->nvalue_table;
922 sr_info->nvalue_count = pdata->nvalue_count;
923 sr_info->senn_mod = pdata->senn_mod;
924 sr_info->senp_mod = pdata->senp_mod;
925 sr_info->autocomp_active = false;
926 sr_info->ip_type = pdata->ip_type;
927 sr_info->base = ioremap(mem->start, resource_size(mem));
928 if (!sr_info->base) {
929 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
930 ret = -ENOMEM;
931 goto err_release_region;
932 }
933
934 if (irq)
935 sr_info->irq = irq->start;
936
937 sr_set_clk_length(sr_info);
938 sr_set_regfields(sr_info);
939
940 list_add(&sr_info->node, &sr_list);
941
942 /*
943 * Call into late init to do intializations that require
944 * both sr driver and sr class driver to be initiallized.
945 */
946 if (sr_class) {
947 ret = sr_late_init(sr_info);
948 if (ret) {
949 pr_warning("%s: Error in SR late init\n", __func__);
950 goto err_iounmap;
951 }
952 }
953
954 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
955 if (!sr_dbg_dir) {
956 sr_dbg_dir = debugfs_create_dir("smartreflex", NULL);
957 if (IS_ERR_OR_NULL(sr_dbg_dir)) {
958 ret = PTR_ERR(sr_dbg_dir);
959 pr_err("%s:sr debugfs dir creation failed(%d)\n",
960 __func__, ret);
961 goto err_iounmap;
962 }
963 }
964
965 sr_info->dbg_dir = debugfs_create_dir(sr_info->name, sr_dbg_dir);
966 if (IS_ERR_OR_NULL(sr_info->dbg_dir)) {
967 dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
968 __func__);
969 ret = PTR_ERR(sr_info->dbg_dir);
970 goto err_free_name;
971 }
972
973 (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR,
974 sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops);
975 (void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir,
976 &sr_info->err_weight);
977 (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir,
978 &sr_info->err_maxlimit);
979
980 nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir);
981 if (IS_ERR_OR_NULL(nvalue_dir)) {
982 dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
983 "for n-values\n", __func__);
984 ret = PTR_ERR(nvalue_dir);
985 goto err_debugfs;
986 }
987
988 if (sr_info->nvalue_count == 0 || !sr_info->nvalue_table) {
989 dev_warn(&pdev->dev, "%s: %s: No Voltage table for the corresponding vdd. Cannot create debugfs entries for n-values\n",
990 __func__, sr_info->name);
991
992 ret = -ENODATA;
993 goto err_debugfs;
994 }
995
996 for (i = 0; i < sr_info->nvalue_count; i++) {
997 char name[NVALUE_NAME_LEN + 1];
998
999 snprintf(name, sizeof(name), "volt_%lu",
1000 sr_info->nvalue_table[i].volt_nominal);
1001 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
1002 &(sr_info->nvalue_table[i].nvalue));
1003 snprintf(name, sizeof(name), "errminlimit_%lu",
1004 sr_info->nvalue_table[i].volt_nominal);
1005 (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
1006 &(sr_info->nvalue_table[i].errminlimit));
1007
1008 }
1009
1010 return ret;
1011
1012err_debugfs:
1013 debugfs_remove_recursive(sr_info->dbg_dir);
1014err_free_name:
1015 kfree(sr_info->name);
1016err_iounmap:
1017 list_del(&sr_info->node);
1018 iounmap(sr_info->base);
1019err_release_region:
1020 release_mem_region(mem->start, resource_size(mem));
1021err_free_devinfo:
1022 kfree(sr_info);
1023
1024 return ret;
1025}
1026
1027static int __devexit omap_sr_remove(struct platform_device *pdev)
1028{
1029 struct omap_sr_data *pdata = pdev->dev.platform_data;
1030 struct omap_sr *sr_info;
1031 struct resource *mem;
1032
1033 if (!pdata) {
1034 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
1035 return -EINVAL;
1036 }
1037
1038 sr_info = _sr_lookup(pdata->voltdm);
1039 if (IS_ERR(sr_info)) {
1040 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
1041 __func__);
1042 return PTR_ERR(sr_info);
1043 }
1044
1045 if (sr_info->autocomp_active)
1046 sr_stop_vddautocomp(sr_info);
1047 if (sr_info->dbg_dir)
1048 debugfs_remove_recursive(sr_info->dbg_dir);
1049
1050 list_del(&sr_info->node);
1051 iounmap(sr_info->base);
1052 kfree(sr_info->name);
1053 kfree(sr_info);
1054 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1055 release_mem_region(mem->start, resource_size(mem));
1056
1057 return 0;
1058}
1059
1060static void __devexit omap_sr_shutdown(struct platform_device *pdev)
1061{
1062 struct omap_sr_data *pdata = pdev->dev.platform_data;
1063 struct omap_sr *sr_info;
1064
1065 if (!pdata) {
1066 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
1067 return;
1068 }
1069
1070 sr_info = _sr_lookup(pdata->voltdm);
1071 if (IS_ERR(sr_info)) {
1072 dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
1073 __func__);
1074 return;
1075 }
1076
1077 if (sr_info->autocomp_active)
1078 sr_stop_vddautocomp(sr_info);
1079
1080 return;
1081}
1082
1083static struct platform_driver smartreflex_driver = {
1084 .remove = __devexit_p(omap_sr_remove),
1085 .shutdown = __devexit_p(omap_sr_shutdown),
1086 .driver = {
1087 .name = "smartreflex",
1088 },
1089};
1090
1091static int __init sr_init(void)
1092{
1093 int ret = 0;
1094
1095 /*
1096 * sr_init is a late init. If by then a pmic specific API is not
1097 * registered either there is no need for anything to be done on
1098 * the PMIC side or somebody has forgotten to register a PMIC
1099 * handler. Warn for the second condition.
1100 */
1101 if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
1102 sr_pmic_data->sr_pmic_init();
1103 else
1104 pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
1105
1106 ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
1107 if (ret) {
1108 pr_err("%s: platform driver register failed for SR\n",
1109 __func__);
1110 return ret;
1111 }
1112
1113 return 0;
1114}
1115late_initcall(sr_init);
1116
1117static void __exit sr_exit(void)
1118{
1119 platform_driver_unregister(&smartreflex_driver);
1120}
1121module_exit(sr_exit);
1122
1123MODULE_DESCRIPTION("OMAP Smartreflex Driver");
1124MODULE_LICENSE("GPL");
1125MODULE_ALIAS("platform:" DRIVER_NAME);
1126MODULE_AUTHOR("Texas Instruments Inc");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-17 14:28:10 -0500