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984aa6db TG |
1 | /* |
2 | * OMAP SmartReflex Voltage Control | |
3 | * | |
4 | * Author: Thara Gopinath <thara@ti.com> | |
5 | * | |
6 | * Copyright (C) 2010 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/interrupt.h> | |
21 | #include <linux/clk.h> | |
22 | #include <linux/io.h> | |
23 | #include <linux/debugfs.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/pm_runtime.h> | |
27 | ||
28 | #include <plat/common.h> | |
984aa6db TG |
29 | |
30 | #include "pm.h" | |
7328ff4d | 31 | #include "smartreflex.h" |
984aa6db TG |
32 | |
33 | #define SMARTREFLEX_NAME_LEN 16 | |
077fceca | 34 | #define NVALUE_NAME_LEN 40 |
984aa6db TG |
35 | #define SR_DISABLE_TIMEOUT 200 |
36 | ||
37 | struct omap_sr { | |
38 | int srid; | |
39 | int ip_type; | |
40 | int nvalue_count; | |
41 | bool autocomp_active; | |
42 | u32 clk_length; | |
43 | u32 err_weight; | |
44 | u32 err_minlimit; | |
45 | u32 err_maxlimit; | |
46 | u32 accum_data; | |
47 | u32 senn_avgweight; | |
48 | u32 senp_avgweight; | |
49 | u32 senp_mod; | |
50 | u32 senn_mod; | |
51 | unsigned int irq; | |
52 | void __iomem *base; | |
53 | struct platform_device *pdev; | |
54 | struct list_head node; | |
55 | struct omap_sr_nvalue_table *nvalue_table; | |
56 | struct voltagedomain *voltdm; | |
b1ace380 | 57 | struct dentry *dbg_dir; |
984aa6db TG |
58 | }; |
59 | ||
60 | /* sr_list contains all the instances of smartreflex module */ | |
61 | static LIST_HEAD(sr_list); | |
62 | ||
63 | static struct omap_sr_class_data *sr_class; | |
64 | static struct omap_sr_pmic_data *sr_pmic_data; | |
65 | ||
66 | static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value) | |
67 | { | |
68 | __raw_writel(value, (sr->base + offset)); | |
69 | } | |
70 | ||
71 | static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask, | |
72 | u32 value) | |
73 | { | |
74 | u32 reg_val; | |
75 | u32 errconfig_offs = 0, errconfig_mask = 0; | |
76 | ||
77 | reg_val = __raw_readl(sr->base + offset); | |
78 | reg_val &= ~mask; | |
79 | ||
80 | /* | |
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 | |
87 | * those bits. | |
88 | */ | |
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; | |
95 | } | |
96 | ||
97 | if (offset == errconfig_offs) | |
98 | reg_val &= ~errconfig_mask; | |
99 | ||
100 | reg_val |= value; | |
101 | ||
102 | __raw_writel(reg_val, (sr->base + offset)); | |
103 | } | |
104 | ||
105 | static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset) | |
106 | { | |
107 | return __raw_readl(sr->base + offset); | |
108 | } | |
109 | ||
110 | static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm) | |
111 | { | |
112 | struct omap_sr *sr_info; | |
113 | ||
114 | if (!voltdm) { | |
115 | pr_err("%s: Null voltage domain passed!\n", __func__); | |
116 | return ERR_PTR(-EINVAL); | |
117 | } | |
118 | ||
119 | list_for_each_entry(sr_info, &sr_list, node) { | |
120 | if (voltdm == sr_info->voltdm) | |
121 | return sr_info; | |
122 | } | |
123 | ||
124 | return ERR_PTR(-ENODATA); | |
125 | } | |
126 | ||
127 | static irqreturn_t sr_interrupt(int irq, void *data) | |
128 | { | |
129 | struct omap_sr *sr_info = (struct omap_sr *)data; | |
130 | u32 status = 0; | |
131 | ||
132 | if (sr_info->ip_type == SR_TYPE_V1) { | |
133 | /* Read the status bits */ | |
134 | status = sr_read_reg(sr_info, ERRCONFIG_V1); | |
135 | ||
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); | |
141 | ||
142 | /* Clear them by writing back */ | |
143 | sr_write_reg(sr_info, IRQSTATUS, status); | |
144 | } | |
145 | ||
146 | if (sr_class->class_type == SR_CLASS2 && sr_class->notify) | |
147 | sr_class->notify(sr_info->voltdm, status); | |
148 | ||
149 | return IRQ_HANDLED; | |
150 | } | |
151 | ||
152 | static void sr_set_clk_length(struct omap_sr *sr) | |
153 | { | |
154 | struct clk *sys_ck; | |
155 | u32 sys_clk_speed; | |
156 | ||
b35cecf9 TG |
157 | if (cpu_is_omap34xx()) |
158 | sys_ck = clk_get(NULL, "sys_ck"); | |
159 | else | |
160 | sys_ck = clk_get(NULL, "sys_clkin_ck"); | |
161 | ||
984aa6db TG |
162 | if (IS_ERR(sys_ck)) { |
163 | dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n", | |
164 | __func__); | |
165 | return; | |
166 | } | |
167 | sys_clk_speed = clk_get_rate(sys_ck); | |
168 | clk_put(sys_ck); | |
169 | ||
170 | switch (sys_clk_speed) { | |
171 | case 12000000: | |
172 | sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK; | |
173 | break; | |
174 | case 13000000: | |
175 | sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK; | |
176 | break; | |
177 | case 19200000: | |
178 | sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK; | |
179 | break; | |
180 | case 26000000: | |
181 | sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK; | |
182 | break; | |
183 | case 38400000: | |
184 | sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK; | |
185 | break; | |
186 | default: | |
187 | dev_err(&sr->pdev->dev, "%s: Invalid sysclk value: %d\n", | |
188 | __func__, sys_clk_speed); | |
189 | break; | |
190 | } | |
191 | } | |
192 | ||
193 | static void sr_set_regfields(struct omap_sr *sr) | |
194 | { | |
195 | /* | |
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. | |
200 | */ | |
b35cecf9 | 201 | if (cpu_is_omap34xx() || cpu_is_omap44xx()) { |
984aa6db TG |
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; | |
208 | } else { | |
209 | sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT; | |
210 | sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT; | |
211 | } | |
212 | } | |
213 | } | |
214 | ||
215 | static void sr_start_vddautocomp(struct omap_sr *sr) | |
216 | { | |
217 | if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) { | |
218 | dev_warn(&sr->pdev->dev, | |
219 | "%s: smartreflex class driver not registered\n", | |
220 | __func__); | |
221 | return; | |
222 | } | |
223 | ||
224 | if (!sr_class->enable(sr->voltdm)) | |
225 | sr->autocomp_active = true; | |
226 | } | |
227 | ||
228 | static void sr_stop_vddautocomp(struct omap_sr *sr) | |
229 | { | |
230 | if (!sr_class || !(sr_class->disable)) { | |
231 | dev_warn(&sr->pdev->dev, | |
232 | "%s: smartreflex class driver not registered\n", | |
233 | __func__); | |
234 | return; | |
235 | } | |
236 | ||
237 | if (sr->autocomp_active) { | |
238 | sr_class->disable(sr->voltdm, 1); | |
239 | sr->autocomp_active = false; | |
240 | } | |
241 | } | |
242 | ||
243 | /* | |
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. | |
249 | * | |
25985edc | 250 | * Currently this function registers interrrupt handler for a particular SR |
984aa6db TG |
251 | * if smartreflex class driver is already registered and has |
252 | * requested for interrupts and the SR interrupt line in present. | |
253 | */ | |
254 | static int sr_late_init(struct omap_sr *sr_info) | |
255 | { | |
256 | char *name; | |
257 | struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data; | |
258 | struct resource *mem; | |
259 | int ret = 0; | |
260 | ||
261 | if (sr_class->class_type == SR_CLASS2 && | |
262 | sr_class->notify_flags && sr_info->irq) { | |
263 | ||
5c56f32e VK |
264 | name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name); |
265 | if (name == NULL) { | |
266 | ret = -ENOMEM; | |
267 | goto error; | |
268 | } | |
984aa6db TG |
269 | ret = request_irq(sr_info->irq, sr_interrupt, |
270 | 0, name, (void *)sr_info); | |
271 | if (ret) | |
272 | goto error; | |
273 | } | |
274 | ||
275 | if (pdata && pdata->enable_on_init) | |
276 | sr_start_vddautocomp(sr_info); | |
277 | ||
278 | return ret; | |
279 | ||
280 | error: | |
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__); | |
b3329a33 | 288 | kfree(name); |
984aa6db TG |
289 | kfree(sr_info); |
290 | return ret; | |
291 | } | |
292 | ||
293 | static void sr_v1_disable(struct omap_sr *sr) | |
294 | { | |
295 | int timeout = 0; | |
296 | ||
297 | /* Enable MCUDisableAcknowledge interrupt */ | |
298 | sr_modify_reg(sr, ERRCONFIG_V1, | |
299 | ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN); | |
300 | ||
301 | /* SRCONFIG - disable SR */ | |
302 | sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0); | |
303 | ||
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)); | |
311 | ||
312 | /* | |
313 | * Wait for SR to be disabled. | |
314 | * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us. | |
315 | */ | |
316 | omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) & | |
317 | ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT, | |
318 | timeout); | |
319 | ||
320 | if (timeout >= SR_DISABLE_TIMEOUT) | |
321 | dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n", | |
322 | __func__); | |
323 | ||
324 | /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */ | |
325 | sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN, | |
326 | ERRCONFIG_MCUDISACKINTST); | |
327 | } | |
328 | ||
329 | static void sr_v2_disable(struct omap_sr *sr) | |
330 | { | |
331 | int timeout = 0; | |
332 | ||
333 | /* Enable MCUDisableAcknowledge interrupt */ | |
334 | sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT); | |
335 | ||
336 | /* SRCONFIG - disable SR */ | |
337 | sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0); | |
338 | ||
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)); | |
348 | ||
349 | /* | |
350 | * Wait for SR to be disabled. | |
351 | * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us. | |
352 | */ | |
353 | omap_test_timeout((sr_read_reg(sr, IRQSTATUS) & | |
354 | IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT, | |
355 | timeout); | |
356 | ||
357 | if (timeout >= SR_DISABLE_TIMEOUT) | |
358 | dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n", | |
359 | __func__); | |
360 | ||
361 | /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */ | |
362 | sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT); | |
363 | sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT); | |
364 | } | |
365 | ||
366 | static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs) | |
367 | { | |
368 | int i; | |
369 | ||
370 | if (!sr->nvalue_table) { | |
371 | dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n", | |
372 | __func__); | |
373 | return 0; | |
374 | } | |
375 | ||
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; | |
379 | } | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | /* Public Functions */ | |
385 | ||
386 | /** | |
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. | |
390 | * | |
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. | |
397 | */ | |
398 | int sr_configure_errgen(struct voltagedomain *voltdm) | |
399 | { | |
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); | |
404 | ||
405 | if (IS_ERR(sr)) { | |
406 | pr_warning("%s: omap_sr struct for sr_%s not found\n", | |
407 | __func__, voltdm->name); | |
408 | return -EINVAL; | |
409 | } | |
410 | ||
411 | if (!sr->clk_length) | |
412 | sr_set_clk_length(sr); | |
413 | ||
414 | senp_en = sr->senp_mod; | |
415 | senn_en = sr->senn_mod; | |
416 | ||
417 | sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) | | |
418 | SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN; | |
419 | ||
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; | |
433 | } else { | |
434 | dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex" | |
435 | "module without specifying the ip\n", __func__); | |
436 | return -EINVAL; | |
437 | } | |
438 | ||
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), | |
446 | sr_errconfig); | |
447 | ||
448 | /* Enabling the interrupts if the ERROR module is used */ | |
449 | sr_modify_reg(sr, errconfig_offs, | |
450 | vpboundint_en, (vpboundint_en | vpboundint_st)); | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | /** | |
456 | * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the | |
457 | * minmaxavg module. | |
458 | * @voltdm: VDD pointer to which the SR module to be configured belongs to. | |
459 | * | |
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. | |
466 | */ | |
467 | int sr_configure_minmax(struct voltagedomain *voltdm) | |
468 | { | |
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); | |
473 | ||
474 | if (IS_ERR(sr)) { | |
475 | pr_warning("%s: omap_sr struct for sr_%s not found\n", | |
476 | __func__, voltdm->name); | |
477 | return -EINVAL; | |
478 | } | |
479 | ||
480 | if (!sr->clk_length) | |
481 | sr_set_clk_length(sr); | |
482 | ||
483 | senp_en = sr->senp_mod; | |
484 | senn_en = sr->senn_mod; | |
485 | ||
486 | sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) | | |
487 | SRCONFIG_SENENABLE | | |
488 | (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT); | |
489 | ||
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; | |
497 | } else { | |
498 | dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex" | |
499 | "module without specifying the ip\n", __func__); | |
500 | return -EINVAL; | |
501 | } | |
502 | ||
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); | |
508 | ||
509 | /* | |
510 | * Enabling the interrupts if MINMAXAVG module is used. | |
511 | * TODO: check if all the interrupts are mandatory | |
512 | */ | |
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); | |
527 | } | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
532 | /** | |
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. | |
538 | * | |
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. | |
542 | */ | |
543 | int sr_enable(struct voltagedomain *voltdm, unsigned long volt) | |
544 | { | |
545 | u32 nvalue_reciprocal; | |
546 | struct omap_volt_data *volt_data; | |
547 | struct omap_sr *sr = _sr_lookup(voltdm); | |
548 | int ret; | |
549 | ||
550 | if (IS_ERR(sr)) { | |
551 | pr_warning("%s: omap_sr struct for sr_%s not found\n", | |
552 | __func__, voltdm->name); | |
553 | return -EINVAL; | |
554 | } | |
555 | ||
556 | volt_data = omap_voltage_get_voltdata(sr->voltdm, volt); | |
557 | ||
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); | |
561 | return -ENODATA; | |
562 | } | |
563 | ||
564 | nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs); | |
565 | ||
566 | if (!nvalue_reciprocal) { | |
567 | dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n", | |
568 | __func__, volt); | |
569 | return -ENODATA; | |
570 | } | |
571 | ||
572 | /* errminlimit is opp dependent and hence linked to voltage */ | |
573 | sr->err_minlimit = volt_data->sr_errminlimit; | |
574 | ||
575 | pm_runtime_get_sync(&sr->pdev->dev); | |
576 | ||
577 | /* Check if SR is already enabled. If yes do nothing */ | |
578 | if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) | |
579 | return 0; | |
580 | ||
581 | /* Configure SR */ | |
582 | ret = sr_class->configure(voltdm); | |
583 | if (ret) | |
584 | return ret; | |
585 | ||
586 | sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal); | |
587 | ||
588 | /* SRCONFIG - enable SR */ | |
589 | sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE); | |
590 | return 0; | |
591 | } | |
592 | ||
593 | /** | |
594 | * sr_disable() - Disables the smartreflex module. | |
595 | * @voltdm: VDD pointer to which the SR module to be configured belongs to. | |
596 | * | |
597 | * This API is to be called from the smartreflex class driver to | |
598 | * disable a smartreflex module. | |
599 | */ | |
600 | void sr_disable(struct voltagedomain *voltdm) | |
601 | { | |
602 | struct omap_sr *sr = _sr_lookup(voltdm); | |
603 | ||
604 | if (IS_ERR(sr)) { | |
605 | pr_warning("%s: omap_sr struct for sr_%s not found\n", | |
606 | __func__, voltdm->name); | |
607 | return; | |
608 | } | |
609 | ||
610 | /* Check if SR clocks are already disabled. If yes do nothing */ | |
611 | if (pm_runtime_suspended(&sr->pdev->dev)) | |
612 | return; | |
613 | ||
614 | /* | |
615 | * Disable SR if only it is indeed enabled. Else just | |
616 | * disable the clocks. | |
617 | */ | |
618 | if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) { | |
619 | if (sr->ip_type == SR_TYPE_V1) | |
620 | sr_v1_disable(sr); | |
621 | else if (sr->ip_type == SR_TYPE_V2) | |
622 | sr_v2_disable(sr); | |
623 | } | |
624 | ||
625 | pm_runtime_put_sync(&sr->pdev->dev); | |
626 | } | |
627 | ||
628 | /** | |
629 | * sr_register_class() - API to register a smartreflex class parameters. | |
630 | * @class_data: The structure containing various sr class specific data. | |
631 | * | |
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 | |
634 | * error value. | |
635 | */ | |
636 | int sr_register_class(struct omap_sr_class_data *class_data) | |
637 | { | |
638 | struct omap_sr *sr_info; | |
639 | ||
640 | if (!class_data) { | |
641 | pr_warning("%s:, Smartreflex class data passed is NULL\n", | |
642 | __func__); | |
643 | return -EINVAL; | |
644 | } | |
645 | ||
646 | if (sr_class) { | |
647 | pr_warning("%s: Smartreflex class driver already registered\n", | |
648 | __func__); | |
649 | return -EBUSY; | |
650 | } | |
651 | ||
652 | sr_class = class_data; | |
653 | ||
654 | /* | |
655 | * Call into late init to do intializations that require | |
656 | * both sr driver and sr class driver to be initiallized. | |
657 | */ | |
658 | list_for_each_entry(sr_info, &sr_list, node) | |
659 | sr_late_init(sr_info); | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
664 | /** | |
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. | |
668 | * | |
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. | |
673 | */ | |
674 | void omap_sr_enable(struct voltagedomain *voltdm) | |
675 | { | |
676 | struct omap_sr *sr = _sr_lookup(voltdm); | |
677 | ||
678 | if (IS_ERR(sr)) { | |
679 | pr_warning("%s: omap_sr struct for sr_%s not found\n", | |
680 | __func__, voltdm->name); | |
681 | return; | |
682 | } | |
683 | ||
684 | if (!sr->autocomp_active) | |
685 | return; | |
686 | ||
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__); | |
690 | return; | |
691 | } | |
692 | ||
693 | sr_class->enable(voltdm); | |
694 | } | |
695 | ||
696 | /** | |
697 | * omap_sr_disable() - API to disable SR without resetting the voltage | |
698 | * processor voltage | |
699 | * @voltdm: VDD pointer to which the SR module to be configured belongs to. | |
700 | * | |
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. | |
706 | */ | |
707 | void omap_sr_disable(struct voltagedomain *voltdm) | |
708 | { | |
709 | struct omap_sr *sr = _sr_lookup(voltdm); | |
710 | ||
711 | if (IS_ERR(sr)) { | |
712 | pr_warning("%s: omap_sr struct for sr_%s not found\n", | |
713 | __func__, voltdm->name); | |
714 | return; | |
715 | } | |
716 | ||
717 | if (!sr->autocomp_active) | |
718 | return; | |
719 | ||
720 | if (!sr_class || !(sr_class->disable)) { | |
721 | dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not" | |
722 | "registered\n", __func__); | |
723 | return; | |
724 | } | |
725 | ||
726 | sr_class->disable(voltdm, 0); | |
727 | } | |
728 | ||
729 | /** | |
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. | |
733 | * | |
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. | |
739 | */ | |
740 | void omap_sr_disable_reset_volt(struct voltagedomain *voltdm) | |
741 | { | |
742 | struct omap_sr *sr = _sr_lookup(voltdm); | |
743 | ||
744 | if (IS_ERR(sr)) { | |
745 | pr_warning("%s: omap_sr struct for sr_%s not found\n", | |
746 | __func__, voltdm->name); | |
747 | return; | |
748 | } | |
749 | ||
750 | if (!sr->autocomp_active) | |
751 | return; | |
752 | ||
753 | if (!sr_class || !(sr_class->disable)) { | |
754 | dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not" | |
755 | "registered\n", __func__); | |
756 | return; | |
757 | } | |
758 | ||
759 | sr_class->disable(voltdm, 1); | |
760 | } | |
761 | ||
762 | /** | |
763 | * omap_sr_register_pmic() - API to register pmic specific info. | |
764 | * @pmic_data: The structure containing pmic specific data. | |
765 | * | |
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. | |
769 | */ | |
770 | void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data) | |
771 | { | |
772 | if (!pmic_data) { | |
773 | pr_warning("%s: Trying to register NULL PMIC data structure" | |
774 | "with smartreflex\n", __func__); | |
775 | return; | |
776 | } | |
777 | ||
778 | sr_pmic_data = pmic_data; | |
779 | } | |
780 | ||
781 | /* PM Debug Fs enteries to enable disable smartreflex. */ | |
782 | static int omap_sr_autocomp_show(void *data, u64 *val) | |
783 | { | |
784 | struct omap_sr *sr_info = (struct omap_sr *) data; | |
785 | ||
786 | if (!sr_info) { | |
8353584e | 787 | pr_warning("%s: omap_sr struct not found\n", __func__); |
984aa6db TG |
788 | return -EINVAL; |
789 | } | |
790 | ||
791 | *val = sr_info->autocomp_active; | |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
796 | static int omap_sr_autocomp_store(void *data, u64 val) | |
797 | { | |
798 | struct omap_sr *sr_info = (struct omap_sr *) data; | |
799 | ||
800 | if (!sr_info) { | |
8353584e | 801 | pr_warning("%s: omap_sr struct not found\n", __func__); |
984aa6db TG |
802 | return -EINVAL; |
803 | } | |
804 | ||
805 | /* Sanity check */ | |
806 | if (val && (val != 1)) { | |
807 | pr_warning("%s: Invalid argument %lld\n", __func__, val); | |
808 | return -EINVAL; | |
809 | } | |
810 | ||
811 | if (!val) | |
812 | sr_stop_vddautocomp(sr_info); | |
813 | else | |
814 | sr_start_vddautocomp(sr_info); | |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
819 | DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show, | |
820 | omap_sr_autocomp_store, "%llu\n"); | |
821 | ||
822 | static int __init omap_sr_probe(struct platform_device *pdev) | |
823 | { | |
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; | |
b1ace380 | 827 | struct dentry *vdd_dbg_dir, *nvalue_dir; |
077fceca TG |
828 | struct omap_volt_data *volt_data; |
829 | int i, ret = 0; | |
984aa6db TG |
830 | |
831 | if (!sr_info) { | |
832 | dev_err(&pdev->dev, "%s: unable to allocate sr_info\n", | |
833 | __func__); | |
834 | return -ENOMEM; | |
835 | } | |
836 | ||
837 | if (!pdata) { | |
838 | dev_err(&pdev->dev, "%s: platform data missing\n", __func__); | |
720bc782 SW |
839 | ret = -EINVAL; |
840 | goto err_free_devinfo; | |
984aa6db TG |
841 | } |
842 | ||
843 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
844 | if (!mem) { | |
845 | dev_err(&pdev->dev, "%s: no mem resource\n", __func__); | |
846 | ret = -ENODEV; | |
847 | goto err_free_devinfo; | |
848 | } | |
849 | ||
da9e7392 AK |
850 | mem = request_mem_region(mem->start, resource_size(mem), |
851 | dev_name(&pdev->dev)); | |
852 | if (!mem) { | |
853 | dev_err(&pdev->dev, "%s: no mem region\n", __func__); | |
854 | ret = -EBUSY; | |
855 | goto err_free_devinfo; | |
856 | } | |
857 | ||
984aa6db TG |
858 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
859 | ||
860 | pm_runtime_enable(&pdev->dev); | |
861 | ||
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__); | |
874 | ret = -ENOMEM; | |
875 | goto err_release_region; | |
876 | } | |
877 | ||
878 | if (irq) | |
879 | sr_info->irq = irq->start; | |
880 | ||
881 | sr_set_clk_length(sr_info); | |
882 | sr_set_regfields(sr_info); | |
883 | ||
884 | list_add(&sr_info->node, &sr_list); | |
885 | ||
886 | /* | |
887 | * Call into late init to do intializations that require | |
888 | * both sr driver and sr class driver to be initiallized. | |
889 | */ | |
890 | if (sr_class) { | |
891 | ret = sr_late_init(sr_info); | |
892 | if (ret) { | |
893 | pr_warning("%s: Error in SR late init\n", __func__); | |
0bf6e2ec | 894 | return ret; |
984aa6db TG |
895 | } |
896 | } | |
897 | ||
898 | dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__); | |
899 | ||
900 | /* | |
901 | * If the voltage domain debugfs directory is not created, do | |
902 | * not try to create rest of the debugfs entries. | |
903 | */ | |
904 | vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm); | |
b3329a33 SG |
905 | if (!vdd_dbg_dir) { |
906 | ret = -EINVAL; | |
0c49cc16 | 907 | goto err_iounmap; |
b3329a33 | 908 | } |
984aa6db | 909 | |
b1ace380 AS |
910 | sr_info->dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir); |
911 | if (IS_ERR(sr_info->dbg_dir)) { | |
984aa6db TG |
912 | dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n", |
913 | __func__); | |
b1ace380 | 914 | ret = PTR_ERR(sr_info->dbg_dir); |
0c49cc16 | 915 | goto err_iounmap; |
984aa6db TG |
916 | } |
917 | ||
b1ace380 AS |
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, | |
077fceca | 921 | &sr_info->err_weight); |
b1ace380 | 922 | (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir, |
077fceca | 923 | &sr_info->err_maxlimit); |
b1ace380 | 924 | (void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir, |
077fceca TG |
925 | &sr_info->err_minlimit); |
926 | ||
b1ace380 | 927 | nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir); |
077fceca TG |
928 | if (IS_ERR(nvalue_dir)) { |
929 | dev_err(&pdev->dev, "%s: Unable to create debugfs directory" | |
930 | "for n-values\n", __func__); | |
b3329a33 | 931 | ret = PTR_ERR(nvalue_dir); |
0c49cc16 | 932 | goto err_iounmap; |
077fceca TG |
933 | } |
934 | ||
935 | omap_voltage_get_volttable(sr_info->voltdm, &volt_data); | |
936 | if (!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); | |
b3329a33 | 941 | ret = -ENODATA; |
0c49cc16 | 942 | goto err_iounmap; |
077fceca TG |
943 | } |
944 | ||
945 | for (i = 0; i < sr_info->nvalue_count; i++) { | |
865212ab | 946 | char name[NVALUE_NAME_LEN + 1]; |
077fceca | 947 | |
865212ab AK |
948 | snprintf(name, sizeof(name), "volt_%d", |
949 | volt_data[i].volt_nominal); | |
1232a185 | 950 | (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir, |
077fceca TG |
951 | &(sr_info->nvalue_table[i].nvalue)); |
952 | } | |
984aa6db TG |
953 | |
954 | return ret; | |
955 | ||
0c49cc16 | 956 | err_iounmap: |
833d78fc | 957 | list_del(&sr_info->node); |
0c49cc16 | 958 | iounmap(sr_info->base); |
984aa6db TG |
959 | err_release_region: |
960 | release_mem_region(mem->start, resource_size(mem)); | |
961 | err_free_devinfo: | |
962 | kfree(sr_info); | |
963 | ||
964 | return ret; | |
965 | } | |
966 | ||
967 | static int __devexit omap_sr_remove(struct platform_device *pdev) | |
968 | { | |
969 | struct omap_sr_data *pdata = pdev->dev.platform_data; | |
970 | struct omap_sr *sr_info; | |
971 | struct resource *mem; | |
972 | ||
973 | if (!pdata) { | |
974 | dev_err(&pdev->dev, "%s: platform data missing\n", __func__); | |
975 | return -EINVAL; | |
976 | } | |
977 | ||
978 | sr_info = _sr_lookup(pdata->voltdm); | |
28693ec0 | 979 | if (IS_ERR(sr_info)) { |
984aa6db TG |
980 | dev_warn(&pdev->dev, "%s: omap_sr struct not found\n", |
981 | __func__); | |
982 | return -EINVAL; | |
983 | } | |
984 | ||
985 | if (sr_info->autocomp_active) | |
986 | sr_stop_vddautocomp(sr_info); | |
b1ace380 AS |
987 | if (sr_info->dbg_dir) |
988 | debugfs_remove_recursive(sr_info->dbg_dir); | |
984aa6db TG |
989 | |
990 | list_del(&sr_info->node); | |
991 | iounmap(sr_info->base); | |
992 | kfree(sr_info); | |
993 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
994 | release_mem_region(mem->start, resource_size(mem)); | |
995 | ||
996 | return 0; | |
997 | } | |
998 | ||
999 | static struct platform_driver smartreflex_driver = { | |
1000 | .remove = omap_sr_remove, | |
1001 | .driver = { | |
1002 | .name = "smartreflex", | |
1003 | }, | |
1004 | }; | |
1005 | ||
1006 | static int __init sr_init(void) | |
1007 | { | |
1008 | int ret = 0; | |
1009 | ||
1010 | /* | |
1011 | * sr_init is a late init. If by then a pmic specific API is not | |
1012 | * registered either there is no need for anything to be done on | |
1013 | * the PMIC side or somebody has forgotten to register a PMIC | |
1014 | * handler. Warn for the second condition. | |
1015 | */ | |
1016 | if (sr_pmic_data && sr_pmic_data->sr_pmic_init) | |
1017 | sr_pmic_data->sr_pmic_init(); | |
1018 | else | |
1019 | pr_warning("%s: No PMIC hook to init smartreflex\n", __func__); | |
1020 | ||
1021 | ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe); | |
1022 | if (ret) { | |
1023 | pr_err("%s: platform driver register failed for SR\n", | |
1024 | __func__); | |
1025 | return ret; | |
1026 | } | |
1027 | ||
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | static void __exit sr_exit(void) | |
1032 | { | |
1033 | platform_driver_unregister(&smartreflex_driver); | |
1034 | } | |
1035 | late_initcall(sr_init); | |
1036 | module_exit(sr_exit); | |
1037 | ||
1038 | MODULE_DESCRIPTION("OMAP Smartreflex Driver"); | |
1039 | MODULE_LICENSE("GPL"); | |
1040 | MODULE_ALIAS("platform:" DRIVER_NAME); | |
1041 | MODULE_AUTHOR("Texas Instruments Inc"); |