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2f34ce81 TG |
1 | /* |
2 | * OMAP3/OMAP4 Voltage Management Routines | |
3 | * | |
4 | * Author: Thara Gopinath <thara@ti.com> | |
5 | * | |
6 | * Copyright (C) 2007 Texas Instruments, Inc. | |
7 | * Rajendra Nayak <rnayak@ti.com> | |
8 | * Lesly A M <x0080970@ti.com> | |
9 | * | |
c0718df4 | 10 | * Copyright (C) 2008, 2011 Nokia Corporation |
2f34ce81 | 11 | * Kalle Jokiniemi |
c0718df4 | 12 | * Paul Walmsley |
2f34ce81 TG |
13 | * |
14 | * Copyright (C) 2010 Texas Instruments, Inc. | |
15 | * Thara Gopinath <thara@ti.com> | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License version 2 as | |
19 | * published by the Free Software Foundation. | |
20 | */ | |
21 | ||
22 | #include <linux/delay.h> | |
23 | #include <linux/io.h> | |
2f34ce81 TG |
24 | #include <linux/err.h> |
25 | #include <linux/debugfs.h> | |
26 | #include <linux/slab.h> | |
0e2f3d9c | 27 | #include <linux/clk.h> |
2f34ce81 TG |
28 | |
29 | #include <plat/common.h> | |
2f34ce81 TG |
30 | |
31 | #include "prm-regbits-34xx.h" | |
bd38107b TG |
32 | #include "prm-regbits-44xx.h" |
33 | #include "prm44xx.h" | |
34 | #include "prcm44xx.h" | |
35 | #include "prminst44xx.h" | |
2f34ce81 TG |
36 | #include "control.h" |
37 | ||
e1d6f472 | 38 | #include "voltage.h" |
e69c22b1 | 39 | #include "powerdomain.h" |
e1d6f472 | 40 | |
c0718df4 PW |
41 | #include "vc.h" |
42 | #include "vp.h" | |
43 | ||
81a60482 | 44 | static LIST_HEAD(voltdm_list); |
2f34ce81 | 45 | |
81a60482 | 46 | static int __init _config_common_vdd_data(struct voltagedomain *voltdm) |
c0718df4 | 47 | { |
c0718df4 | 48 | /* Generic voltage parameters */ |
0f01565a | 49 | voltdm->scale = omap_vp_forceupdate_scale; |
c0718df4 PW |
50 | |
51 | return 0; | |
52 | } | |
53 | ||
81a60482 | 54 | static int __init omap_vdd_data_configure(struct voltagedomain *voltdm) |
bd38107b | 55 | { |
c0718df4 | 56 | int ret = -EINVAL; |
bd38107b | 57 | |
ce8ebe0d | 58 | if (!voltdm->pmic) { |
bd38107b TG |
59 | pr_err("%s: PMIC info requried to configure vdd_%s not" |
60 | "populated.Hence cannot initialize vdd_%s\n", | |
81a60482 | 61 | __func__, voltdm->name, voltdm->name); |
c0718df4 | 62 | goto ovdc_out; |
bd38107b TG |
63 | } |
64 | ||
81a60482 | 65 | if (IS_ERR_VALUE(_config_common_vdd_data(voltdm))) |
c0718df4 | 66 | goto ovdc_out; |
bd38107b | 67 | |
4bcc475e | 68 | ret = 0; |
bd38107b | 69 | |
c0718df4 PW |
70 | ovdc_out: |
71 | return ret; | |
bd38107b TG |
72 | } |
73 | ||
2f34ce81 TG |
74 | /* Public functions */ |
75 | /** | |
76 | * omap_voltage_get_nom_volt() - Gets the current non-auto-compensated voltage | |
77 | * @voltdm: pointer to the VDD for which current voltage info is needed | |
78 | * | |
79 | * API to get the current non-auto-compensated voltage for a VDD. | |
80 | * Returns 0 in case of error else returns the current voltage for the VDD. | |
81 | */ | |
82 | unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm) | |
83 | { | |
84 | struct omap_vdd_info *vdd; | |
85 | ||
86 | if (!voltdm || IS_ERR(voltdm)) { | |
87 | pr_warning("%s: VDD specified does not exist!\n", __func__); | |
88 | return 0; | |
89 | } | |
90 | ||
81a60482 | 91 | vdd = voltdm->vdd; |
2f34ce81 TG |
92 | |
93 | return vdd->curr_volt; | |
94 | } | |
95 | ||
2f34ce81 | 96 | /** |
5e5651be KH |
97 | * voltdm_scale() - API to scale voltage of a particular voltage domain. |
98 | * @voltdm: pointer to the voltage domain which is to be scaled. | |
99 | * @target_volt: The target voltage of the voltage domain | |
2f34ce81 TG |
100 | * |
101 | * This API should be called by the kernel to do the voltage scaling | |
5e5651be | 102 | * for a particular voltage domain during DVFS. |
2f34ce81 | 103 | */ |
5e5651be KH |
104 | int voltdm_scale(struct voltagedomain *voltdm, |
105 | unsigned long target_volt) | |
2f34ce81 | 106 | { |
2f34ce81 TG |
107 | if (!voltdm || IS_ERR(voltdm)) { |
108 | pr_warning("%s: VDD specified does not exist!\n", __func__); | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
0f01565a | 112 | if (!voltdm->scale) { |
2f34ce81 TG |
113 | pr_err("%s: No voltage scale API registered for vdd_%s\n", |
114 | __func__, voltdm->name); | |
115 | return -ENODATA; | |
116 | } | |
117 | ||
0f01565a | 118 | return voltdm->scale(voltdm, target_volt); |
2f34ce81 TG |
119 | } |
120 | ||
121 | /** | |
5e5651be KH |
122 | * voltdm_reset() - Resets the voltage of a particular voltage domain |
123 | * to that of the current OPP. | |
124 | * @voltdm: pointer to the voltage domain whose voltage is to be reset. | |
2f34ce81 TG |
125 | * |
126 | * This API finds out the correct voltage the voltage domain is supposed | |
25985edc | 127 | * to be at and resets the voltage to that level. Should be used especially |
2f34ce81 TG |
128 | * while disabling any voltage compensation modules. |
129 | */ | |
5e5651be | 130 | void voltdm_reset(struct voltagedomain *voltdm) |
2f34ce81 | 131 | { |
5e5651be | 132 | unsigned long target_volt; |
2f34ce81 TG |
133 | |
134 | if (!voltdm || IS_ERR(voltdm)) { | |
135 | pr_warning("%s: VDD specified does not exist!\n", __func__); | |
136 | return; | |
137 | } | |
138 | ||
5e5651be KH |
139 | target_volt = omap_voltage_get_nom_volt(voltdm); |
140 | if (!target_volt) { | |
2f34ce81 TG |
141 | pr_err("%s: unable to find current voltage for vdd_%s\n", |
142 | __func__, voltdm->name); | |
143 | return; | |
144 | } | |
145 | ||
5e5651be | 146 | voltdm_scale(voltdm, target_volt); |
2f34ce81 TG |
147 | } |
148 | ||
149 | /** | |
150 | * omap_voltage_get_volttable() - API to get the voltage table associated with a | |
151 | * particular voltage domain. | |
152 | * @voltdm: pointer to the VDD for which the voltage table is required | |
153 | * @volt_data: the voltage table for the particular vdd which is to be | |
154 | * populated by this API | |
155 | * | |
156 | * This API populates the voltage table associated with a VDD into the | |
157 | * passed parameter pointer. Returns the count of distinct voltages | |
158 | * supported by this vdd. | |
159 | * | |
160 | */ | |
161 | void omap_voltage_get_volttable(struct voltagedomain *voltdm, | |
162 | struct omap_volt_data **volt_data) | |
163 | { | |
164 | struct omap_vdd_info *vdd; | |
165 | ||
166 | if (!voltdm || IS_ERR(voltdm)) { | |
167 | pr_warning("%s: VDD specified does not exist!\n", __func__); | |
168 | return; | |
169 | } | |
170 | ||
81a60482 | 171 | vdd = voltdm->vdd; |
2f34ce81 TG |
172 | |
173 | *volt_data = vdd->volt_data; | |
174 | } | |
175 | ||
176 | /** | |
177 | * omap_voltage_get_voltdata() - API to get the voltage table entry for a | |
178 | * particular voltage | |
179 | * @voltdm: pointer to the VDD whose voltage table has to be searched | |
180 | * @volt: the voltage to be searched in the voltage table | |
181 | * | |
182 | * This API searches through the voltage table for the required voltage | |
183 | * domain and tries to find a matching entry for the passed voltage volt. | |
184 | * If a matching entry is found volt_data is populated with that entry. | |
185 | * This API searches only through the non-compensated voltages int the | |
186 | * voltage table. | |
187 | * Returns pointer to the voltage table entry corresponding to volt on | |
25985edc | 188 | * success. Returns -ENODATA if no voltage table exisits for the passed voltage |
2f34ce81 TG |
189 | * domain or if there is no matching entry. |
190 | */ | |
191 | struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm, | |
192 | unsigned long volt) | |
193 | { | |
194 | struct omap_vdd_info *vdd; | |
195 | int i; | |
196 | ||
197 | if (!voltdm || IS_ERR(voltdm)) { | |
198 | pr_warning("%s: VDD specified does not exist!\n", __func__); | |
199 | return ERR_PTR(-EINVAL); | |
200 | } | |
201 | ||
81a60482 | 202 | vdd = voltdm->vdd; |
2f34ce81 TG |
203 | |
204 | if (!vdd->volt_data) { | |
205 | pr_warning("%s: voltage table does not exist for vdd_%s\n", | |
206 | __func__, voltdm->name); | |
207 | return ERR_PTR(-ENODATA); | |
208 | } | |
209 | ||
210 | for (i = 0; vdd->volt_data[i].volt_nominal != 0; i++) { | |
211 | if (vdd->volt_data[i].volt_nominal == volt) | |
212 | return &vdd->volt_data[i]; | |
213 | } | |
214 | ||
215 | pr_notice("%s: Unable to match the current voltage with the voltage" | |
216 | "table for vdd_%s\n", __func__, voltdm->name); | |
217 | ||
218 | return ERR_PTR(-ENODATA); | |
219 | } | |
220 | ||
221 | /** | |
222 | * omap_voltage_register_pmic() - API to register PMIC specific data | |
223 | * @voltdm: pointer to the VDD for which the PMIC specific data is | |
224 | * to be registered | |
ce8ebe0d | 225 | * @pmic: the structure containing pmic info |
2f34ce81 TG |
226 | * |
227 | * This API is to be called by the SOC/PMIC file to specify the | |
ce8ebe0d | 228 | * pmic specific info as present in omap_voltdm_pmic structure. |
2f34ce81 TG |
229 | */ |
230 | int omap_voltage_register_pmic(struct voltagedomain *voltdm, | |
ce8ebe0d | 231 | struct omap_voltdm_pmic *pmic) |
2f34ce81 | 232 | { |
2f34ce81 TG |
233 | if (!voltdm || IS_ERR(voltdm)) { |
234 | pr_warning("%s: VDD specified does not exist!\n", __func__); | |
235 | return -EINVAL; | |
236 | } | |
237 | ||
ce8ebe0d | 238 | voltdm->pmic = pmic; |
2f34ce81 TG |
239 | |
240 | return 0; | |
241 | } | |
242 | ||
2f34ce81 TG |
243 | /** |
244 | * omap_change_voltscale_method() - API to change the voltage scaling method. | |
245 | * @voltdm: pointer to the VDD whose voltage scaling method | |
246 | * has to be changed. | |
247 | * @voltscale_method: the method to be used for voltage scaling. | |
248 | * | |
249 | * This API can be used by the board files to change the method of voltage | |
250 | * scaling between vpforceupdate and vcbypass. The parameter values are | |
251 | * defined in voltage.h | |
252 | */ | |
253 | void omap_change_voltscale_method(struct voltagedomain *voltdm, | |
0f01565a | 254 | int voltscale_method) |
2f34ce81 | 255 | { |
2f34ce81 TG |
256 | if (!voltdm || IS_ERR(voltdm)) { |
257 | pr_warning("%s: VDD specified does not exist!\n", __func__); | |
258 | return; | |
259 | } | |
260 | ||
2f34ce81 TG |
261 | switch (voltscale_method) { |
262 | case VOLTSCALE_VPFORCEUPDATE: | |
0f01565a | 263 | voltdm->scale = omap_vp_forceupdate_scale; |
2f34ce81 TG |
264 | return; |
265 | case VOLTSCALE_VCBYPASS: | |
0f01565a | 266 | voltdm->scale = omap_vc_bypass_scale; |
2f34ce81 TG |
267 | return; |
268 | default: | |
269 | pr_warning("%s: Trying to change the method of voltage scaling" | |
270 | "to an unsupported one!\n", __func__); | |
271 | } | |
272 | } | |
273 | ||
2f34ce81 TG |
274 | /** |
275 | * omap_voltage_late_init() - Init the various voltage parameters | |
276 | * | |
277 | * This API is to be called in the later stages of the | |
278 | * system boot to init the voltage controller and | |
279 | * voltage processors. | |
280 | */ | |
281 | int __init omap_voltage_late_init(void) | |
282 | { | |
81a60482 | 283 | struct voltagedomain *voltdm; |
2f34ce81 | 284 | |
81a60482 | 285 | if (list_empty(&voltdm_list)) { |
2f34ce81 TG |
286 | pr_err("%s: Voltage driver support not added\n", |
287 | __func__); | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
81a60482 | 291 | list_for_each_entry(voltdm, &voltdm_list, node) { |
0e2f3d9c KH |
292 | struct clk *sys_ck; |
293 | ||
37efca7e KH |
294 | if (!voltdm->scalable) |
295 | continue; | |
296 | ||
0e2f3d9c KH |
297 | sys_ck = clk_get(NULL, voltdm->sys_clk.name); |
298 | if (IS_ERR(sys_ck)) { | |
299 | pr_warning("%s: Could not get sys clk.\n", __func__); | |
300 | return -EINVAL; | |
301 | } | |
302 | voltdm->sys_clk.rate = clk_get_rate(sys_ck); | |
303 | WARN_ON(!voltdm->sys_clk.rate); | |
304 | clk_put(sys_ck); | |
305 | ||
4d47506a | 306 | if (voltdm->vc) { |
0f01565a | 307 | voltdm->scale = omap_vc_bypass_scale; |
d84adcf4 | 308 | omap_vc_init_channel(voltdm); |
4d47506a | 309 | } |
d84adcf4 | 310 | |
81a60482 KH |
311 | if (voltdm->vdd) { |
312 | if (omap_vdd_data_configure(voltdm)) | |
313 | continue; | |
01f48d30 | 314 | omap_vp_init(voltdm); |
81a60482 | 315 | } |
2f34ce81 TG |
316 | } |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
81a60482 | 321 | static struct voltagedomain *_voltdm_lookup(const char *name) |
2f34ce81 | 322 | { |
81a60482 KH |
323 | struct voltagedomain *voltdm, *temp_voltdm; |
324 | ||
325 | voltdm = NULL; | |
326 | ||
327 | list_for_each_entry(temp_voltdm, &voltdm_list, node) { | |
328 | if (!strcmp(name, temp_voltdm->name)) { | |
329 | voltdm = temp_voltdm; | |
330 | break; | |
331 | } | |
332 | } | |
333 | ||
334 | return voltdm; | |
335 | } | |
336 | ||
e69c22b1 KH |
337 | /** |
338 | * voltdm_add_pwrdm - add a powerdomain to a voltagedomain | |
339 | * @voltdm: struct voltagedomain * to add the powerdomain to | |
340 | * @pwrdm: struct powerdomain * to associate with a voltagedomain | |
341 | * | |
342 | * Associate the powerdomain @pwrdm with a voltagedomain @voltdm. This | |
343 | * enables the use of voltdm_for_each_pwrdm(). Returns -EINVAL if | |
344 | * presented with invalid pointers; -ENOMEM if memory could not be allocated; | |
345 | * or 0 upon success. | |
346 | */ | |
347 | int voltdm_add_pwrdm(struct voltagedomain *voltdm, struct powerdomain *pwrdm) | |
348 | { | |
349 | if (!voltdm || !pwrdm) | |
350 | return -EINVAL; | |
351 | ||
352 | pr_debug("voltagedomain: associating powerdomain %s with voltagedomain " | |
353 | "%s\n", pwrdm->name, voltdm->name); | |
354 | ||
355 | list_add(&pwrdm->voltdm_node, &voltdm->pwrdm_list); | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | /** | |
361 | * voltdm_for_each_pwrdm - call function for each pwrdm in a voltdm | |
362 | * @voltdm: struct voltagedomain * to iterate over | |
363 | * @fn: callback function * | |
364 | * | |
365 | * Call the supplied function @fn for each powerdomain in the | |
366 | * voltagedomain @voltdm. Returns -EINVAL if presented with invalid | |
367 | * pointers; or passes along the last return value of the callback | |
368 | * function, which should be 0 for success or anything else to | |
369 | * indicate failure. | |
370 | */ | |
371 | int voltdm_for_each_pwrdm(struct voltagedomain *voltdm, | |
372 | int (*fn)(struct voltagedomain *voltdm, | |
373 | struct powerdomain *pwrdm)) | |
374 | { | |
375 | struct powerdomain *pwrdm; | |
376 | int ret = 0; | |
377 | ||
378 | if (!fn) | |
379 | return -EINVAL; | |
380 | ||
381 | list_for_each_entry(pwrdm, &voltdm->pwrdm_list, voltdm_node) | |
382 | ret = (*fn)(voltdm, pwrdm); | |
383 | ||
384 | return ret; | |
385 | } | |
386 | ||
387 | /** | |
388 | * voltdm_for_each - call function on each registered voltagedomain | |
389 | * @fn: callback function * | |
390 | * | |
391 | * Call the supplied function @fn for each registered voltagedomain. | |
392 | * The callback function @fn can return anything but 0 to bail out | |
393 | * early from the iterator. Returns the last return value of the | |
394 | * callback function, which should be 0 for success or anything else | |
395 | * to indicate failure; or -EINVAL if the function pointer is null. | |
396 | */ | |
397 | int voltdm_for_each(int (*fn)(struct voltagedomain *voltdm, void *user), | |
398 | void *user) | |
399 | { | |
400 | struct voltagedomain *temp_voltdm; | |
401 | int ret = 0; | |
402 | ||
403 | if (!fn) | |
404 | return -EINVAL; | |
405 | ||
406 | list_for_each_entry(temp_voltdm, &voltdm_list, node) { | |
407 | ret = (*fn)(temp_voltdm, user); | |
408 | if (ret) | |
409 | break; | |
410 | } | |
411 | ||
412 | return ret; | |
413 | } | |
414 | ||
81a60482 KH |
415 | static int _voltdm_register(struct voltagedomain *voltdm) |
416 | { | |
417 | if (!voltdm || !voltdm->name) | |
418 | return -EINVAL; | |
419 | ||
e69c22b1 | 420 | INIT_LIST_HEAD(&voltdm->pwrdm_list); |
81a60482 KH |
421 | list_add(&voltdm->node, &voltdm_list); |
422 | ||
423 | pr_debug("voltagedomain: registered %s\n", voltdm->name); | |
424 | ||
2f34ce81 TG |
425 | return 0; |
426 | } | |
81a60482 KH |
427 | |
428 | /** | |
429 | * voltdm_lookup - look up a voltagedomain by name, return a pointer | |
430 | * @name: name of voltagedomain | |
431 | * | |
432 | * Find a registered voltagedomain by its name @name. Returns a pointer | |
433 | * to the struct voltagedomain if found, or NULL otherwise. | |
434 | */ | |
435 | struct voltagedomain *voltdm_lookup(const char *name) | |
436 | { | |
437 | struct voltagedomain *voltdm ; | |
438 | ||
439 | if (!name) | |
440 | return NULL; | |
441 | ||
442 | voltdm = _voltdm_lookup(name); | |
443 | ||
444 | return voltdm; | |
445 | } | |
446 | ||
447 | /** | |
448 | * voltdm_init - set up the voltagedomain layer | |
449 | * @voltdm_list: array of struct voltagedomain pointers to register | |
450 | * | |
451 | * Loop through the array of voltagedomains @voltdm_list, registering all | |
452 | * that are available on the current CPU. If voltdm_list is supplied | |
453 | * and not null, all of the referenced voltagedomains will be | |
454 | * registered. No return value. | |
455 | */ | |
456 | void voltdm_init(struct voltagedomain **voltdms) | |
457 | { | |
458 | struct voltagedomain **v; | |
459 | ||
460 | if (voltdms) { | |
461 | for (v = voltdms; *v; v++) | |
462 | _voltdm_register(*v); | |
463 | } | |
464 | } |