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b04b65ab PW |
1 | /* |
2 | * omap_device implementation | |
3 | * | |
887adeac | 4 | * Copyright (C) 2009-2010 Nokia Corporation |
4788da26 | 5 | * Paul Walmsley, Kevin Hilman |
b04b65ab PW |
6 | * |
7 | * Developed in collaboration with (alphabetical order): Benoit | |
4788da26 | 8 | * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram |
b04b65ab PW |
9 | * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard |
10 | * Woodruff | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | * This code provides a consistent interface for OMAP device drivers | |
17 | * to control power management and interconnect properties of their | |
18 | * devices. | |
19 | * | |
20 | * In the medium- to long-term, this code should either be | |
21 | * a) implemented via arch-specific pointers in platform_data | |
22 | * or | |
23 | * b) implemented as a proper omap_bus/omap_device in Linux, no more | |
24 | * platform_data func pointers | |
25 | * | |
26 | * | |
27 | * Guidelines for usage by driver authors: | |
28 | * | |
29 | * 1. These functions are intended to be used by device drivers via | |
30 | * function pointers in struct platform_data. As an example, | |
31 | * omap_device_enable() should be passed to the driver as | |
32 | * | |
33 | * struct foo_driver_platform_data { | |
34 | * ... | |
35 | * int (*device_enable)(struct platform_device *pdev); | |
36 | * ... | |
37 | * } | |
38 | * | |
39 | * Note that the generic "device_enable" name is used, rather than | |
40 | * "omap_device_enable". This is so other architectures can pass in their | |
41 | * own enable/disable functions here. | |
42 | * | |
43 | * This should be populated during device setup: | |
44 | * | |
45 | * ... | |
46 | * pdata->device_enable = omap_device_enable; | |
47 | * ... | |
48 | * | |
49 | * 2. Drivers should first check to ensure the function pointer is not null | |
50 | * before calling it, as in: | |
51 | * | |
52 | * if (pdata->device_enable) | |
53 | * pdata->device_enable(pdev); | |
54 | * | |
55 | * This allows other architectures that don't use similar device_enable()/ | |
56 | * device_shutdown() functions to execute normally. | |
57 | * | |
58 | * ... | |
59 | * | |
60 | * Suggested usage by device drivers: | |
61 | * | |
62 | * During device initialization: | |
63 | * device_enable() | |
64 | * | |
65 | * During device idle: | |
66 | * (save remaining device context if necessary) | |
67 | * device_idle(); | |
68 | * | |
69 | * During device resume: | |
70 | * device_enable(); | |
71 | * (restore context if necessary) | |
72 | * | |
73 | * During device shutdown: | |
74 | * device_shutdown() | |
75 | * (device must be reinitialized at this point to use it again) | |
76 | * | |
77 | */ | |
78 | #undef DEBUG | |
79 | ||
80 | #include <linux/kernel.h> | |
81 | #include <linux/platform_device.h> | |
5a0e3ad6 | 82 | #include <linux/slab.h> |
b04b65ab PW |
83 | #include <linux/err.h> |
84 | #include <linux/io.h> | |
4ef7aca8 | 85 | #include <linux/clk.h> |
da0653fe | 86 | #include <linux/clkdev.h> |
345f79b3 | 87 | #include <linux/pm_runtime.h> |
b04b65ab | 88 | |
ce491cf8 TL |
89 | #include <plat/omap_device.h> |
90 | #include <plat/omap_hwmod.h> | |
da0653fe | 91 | #include <plat/clock.h> |
b04b65ab PW |
92 | |
93 | /* These parameters are passed to _omap_device_{de,}activate() */ | |
94 | #define USE_WAKEUP_LAT 0 | |
95 | #define IGNORE_WAKEUP_LAT 1 | |
96 | ||
b04b65ab PW |
97 | /* Private functions */ |
98 | ||
b04b65ab PW |
99 | /** |
100 | * _omap_device_activate - increase device readiness | |
101 | * @od: struct omap_device * | |
102 | * @ignore_lat: increase to latency target (0) or full readiness (1)? | |
103 | * | |
104 | * Increase readiness of omap_device @od (thus decreasing device | |
105 | * wakeup latency, but consuming more power). If @ignore_lat is | |
106 | * IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise, | |
107 | * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup | |
108 | * latency is greater than the requested maximum wakeup latency, step | |
109 | * backwards in the omap_device_pm_latency table to ensure the | |
110 | * device's maximum wakeup latency is less than or equal to the | |
111 | * requested maximum wakeup latency. Returns 0. | |
112 | */ | |
113 | static int _omap_device_activate(struct omap_device *od, u8 ignore_lat) | |
114 | { | |
f059429e | 115 | struct timespec a, b, c; |
b04b65ab PW |
116 | |
117 | pr_debug("omap_device: %s: activating\n", od->pdev.name); | |
118 | ||
119 | while (od->pm_lat_level > 0) { | |
120 | struct omap_device_pm_latency *odpl; | |
f059429e | 121 | unsigned long long act_lat = 0; |
b04b65ab PW |
122 | |
123 | od->pm_lat_level--; | |
124 | ||
125 | odpl = od->pm_lats + od->pm_lat_level; | |
126 | ||
127 | if (!ignore_lat && | |
128 | (od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit)) | |
129 | break; | |
130 | ||
d2292667 | 131 | read_persistent_clock(&a); |
b04b65ab PW |
132 | |
133 | /* XXX check return code */ | |
134 | odpl->activate_func(od); | |
135 | ||
d2292667 | 136 | read_persistent_clock(&b); |
b04b65ab | 137 | |
f059429e | 138 | c = timespec_sub(b, a); |
0d93d8bb | 139 | act_lat = timespec_to_ns(&c); |
b04b65ab PW |
140 | |
141 | pr_debug("omap_device: %s: pm_lat %d: activate: elapsed time " | |
0d93d8bb | 142 | "%llu nsec\n", od->pdev.name, od->pm_lat_level, |
f059429e | 143 | act_lat); |
b04b65ab | 144 | |
9799aca2 KH |
145 | if (act_lat > odpl->activate_lat) { |
146 | odpl->activate_lat_worst = act_lat; | |
147 | if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) { | |
148 | odpl->activate_lat = act_lat; | |
149 | pr_warning("omap_device: %s.%d: new worst case " | |
150 | "activate latency %d: %llu\n", | |
151 | od->pdev.name, od->pdev.id, | |
152 | od->pm_lat_level, act_lat); | |
153 | } else | |
154 | pr_warning("omap_device: %s.%d: activate " | |
155 | "latency %d higher than exptected. " | |
156 | "(%llu > %d)\n", | |
157 | od->pdev.name, od->pdev.id, | |
158 | od->pm_lat_level, act_lat, | |
159 | odpl->activate_lat); | |
160 | } | |
b04b65ab PW |
161 | |
162 | od->dev_wakeup_lat -= odpl->activate_lat; | |
163 | } | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | /** | |
169 | * _omap_device_deactivate - decrease device readiness | |
170 | * @od: struct omap_device * | |
171 | * @ignore_lat: decrease to latency target (0) or full inactivity (1)? | |
172 | * | |
173 | * Decrease readiness of omap_device @od (thus increasing device | |
174 | * wakeup latency, but conserving power). If @ignore_lat is | |
175 | * IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise, | |
176 | * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup | |
177 | * latency is less than the requested maximum wakeup latency, step | |
178 | * forwards in the omap_device_pm_latency table to ensure the device's | |
179 | * maximum wakeup latency is less than or equal to the requested | |
180 | * maximum wakeup latency. Returns 0. | |
181 | */ | |
182 | static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat) | |
183 | { | |
f059429e | 184 | struct timespec a, b, c; |
b04b65ab PW |
185 | |
186 | pr_debug("omap_device: %s: deactivating\n", od->pdev.name); | |
187 | ||
188 | while (od->pm_lat_level < od->pm_lats_cnt) { | |
189 | struct omap_device_pm_latency *odpl; | |
f059429e | 190 | unsigned long long deact_lat = 0; |
b04b65ab PW |
191 | |
192 | odpl = od->pm_lats + od->pm_lat_level; | |
193 | ||
194 | if (!ignore_lat && | |
195 | ((od->dev_wakeup_lat + odpl->activate_lat) > | |
196 | od->_dev_wakeup_lat_limit)) | |
197 | break; | |
198 | ||
d2292667 | 199 | read_persistent_clock(&a); |
b04b65ab PW |
200 | |
201 | /* XXX check return code */ | |
202 | odpl->deactivate_func(od); | |
203 | ||
d2292667 | 204 | read_persistent_clock(&b); |
b04b65ab | 205 | |
f059429e | 206 | c = timespec_sub(b, a); |
0d93d8bb | 207 | deact_lat = timespec_to_ns(&c); |
b04b65ab PW |
208 | |
209 | pr_debug("omap_device: %s: pm_lat %d: deactivate: elapsed time " | |
0d93d8bb | 210 | "%llu nsec\n", od->pdev.name, od->pm_lat_level, |
b04b65ab PW |
211 | deact_lat); |
212 | ||
9799aca2 KH |
213 | if (deact_lat > odpl->deactivate_lat) { |
214 | odpl->deactivate_lat_worst = deact_lat; | |
215 | if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) { | |
216 | odpl->deactivate_lat = deact_lat; | |
217 | pr_warning("omap_device: %s.%d: new worst case " | |
218 | "deactivate latency %d: %llu\n", | |
219 | od->pdev.name, od->pdev.id, | |
220 | od->pm_lat_level, deact_lat); | |
221 | } else | |
222 | pr_warning("omap_device: %s.%d: deactivate " | |
223 | "latency %d higher than exptected. " | |
224 | "(%llu > %d)\n", | |
225 | od->pdev.name, od->pdev.id, | |
226 | od->pm_lat_level, deact_lat, | |
227 | odpl->deactivate_lat); | |
228 | } | |
229 | ||
b04b65ab PW |
230 | |
231 | od->dev_wakeup_lat += odpl->activate_lat; | |
232 | ||
233 | od->pm_lat_level++; | |
234 | } | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
4ef7aca8 | 239 | /** |
da0653fe | 240 | * _add_optional_clock_clkdev - Add clkdev entry for hwmod optional clocks |
4ef7aca8 PB |
241 | * @od: struct omap_device *od |
242 | * | |
243 | * For every optional clock present per hwmod per omap_device, this function | |
da0653fe RN |
244 | * adds an entry in the clkdev table of the form <dev-id=dev_name, con-id=role> |
245 | * if it does not exist already. | |
4ef7aca8 PB |
246 | * |
247 | * The function is called from inside omap_device_build_ss(), after | |
248 | * omap_device_register. | |
249 | * | |
250 | * This allows drivers to get a pointer to its optional clocks based on its role | |
251 | * by calling clk_get(<dev*>, <role>). | |
252 | * | |
253 | * No return value. | |
254 | */ | |
da0653fe | 255 | static void _add_optional_clock_clkdev(struct omap_device *od, |
4ef7aca8 PB |
256 | struct omap_hwmod *oh) |
257 | { | |
258 | int i; | |
259 | ||
260 | for (i = 0; i < oh->opt_clks_cnt; i++) { | |
261 | struct omap_hwmod_opt_clk *oc; | |
da0653fe RN |
262 | struct clk *r; |
263 | struct clk_lookup *l; | |
4ef7aca8 PB |
264 | |
265 | oc = &oh->opt_clks[i]; | |
266 | ||
267 | if (!oc->_clk) | |
268 | continue; | |
269 | ||
da0653fe RN |
270 | r = clk_get_sys(dev_name(&od->pdev.dev), oc->role); |
271 | if (!IS_ERR(r)) | |
272 | continue; /* clkdev entry exists */ | |
273 | ||
274 | r = omap_clk_get_by_name((char *)oc->clk); | |
275 | if (IS_ERR(r)) { | |
276 | pr_err("omap_device: %s: omap_clk_get_by_name for %s failed\n", | |
277 | dev_name(&od->pdev.dev), oc->clk); | |
278 | continue; | |
279 | } | |
280 | ||
281 | l = clkdev_alloc(r, oc->role, dev_name(&od->pdev.dev)); | |
282 | if (!l) { | |
283 | pr_err("omap_device: %s: clkdev_alloc for %s failed\n", | |
4ef7aca8 | 284 | dev_name(&od->pdev.dev), oc->role); |
da0653fe RN |
285 | return; |
286 | } | |
287 | clkdev_add(l); | |
4ef7aca8 PB |
288 | } |
289 | } | |
290 | ||
b04b65ab PW |
291 | |
292 | /* Public functions for use by core code */ | |
293 | ||
c80705aa KH |
294 | /** |
295 | * omap_device_get_context_loss_count - get lost context count | |
296 | * @od: struct omap_device * | |
297 | * | |
298 | * Using the primary hwmod, query the context loss count for this | |
299 | * device. | |
300 | * | |
301 | * Callers should consider context for this device lost any time this | |
302 | * function returns a value different than the value the caller got | |
303 | * the last time it called this function. | |
304 | * | |
305 | * If any hwmods exist for the omap_device assoiated with @pdev, | |
306 | * return the context loss counter for that hwmod, otherwise return | |
307 | * zero. | |
308 | */ | |
309 | u32 omap_device_get_context_loss_count(struct platform_device *pdev) | |
310 | { | |
311 | struct omap_device *od; | |
312 | u32 ret = 0; | |
313 | ||
8f0d69de | 314 | od = to_omap_device(pdev); |
c80705aa KH |
315 | |
316 | if (od->hwmods_cnt) | |
317 | ret = omap_hwmod_get_context_loss_count(od->hwmods[0]); | |
318 | ||
319 | return ret; | |
320 | } | |
321 | ||
b04b65ab PW |
322 | /** |
323 | * omap_device_count_resources - count number of struct resource entries needed | |
324 | * @od: struct omap_device * | |
325 | * | |
326 | * Count the number of struct resource entries needed for this | |
327 | * omap_device @od. Used by omap_device_build_ss() to determine how | |
328 | * much memory to allocate before calling | |
329 | * omap_device_fill_resources(). Returns the count. | |
330 | */ | |
331 | int omap_device_count_resources(struct omap_device *od) | |
332 | { | |
b04b65ab PW |
333 | int c = 0; |
334 | int i; | |
335 | ||
f39f4898 KVA |
336 | for (i = 0; i < od->hwmods_cnt; i++) |
337 | c += omap_hwmod_count_resources(od->hwmods[i]); | |
b04b65ab PW |
338 | |
339 | pr_debug("omap_device: %s: counted %d total resources across %d " | |
340 | "hwmods\n", od->pdev.name, c, od->hwmods_cnt); | |
341 | ||
342 | return c; | |
343 | } | |
344 | ||
345 | /** | |
346 | * omap_device_fill_resources - fill in array of struct resource | |
347 | * @od: struct omap_device * | |
348 | * @res: pointer to an array of struct resource to be filled in | |
349 | * | |
350 | * Populate one or more empty struct resource pointed to by @res with | |
351 | * the resource data for this omap_device @od. Used by | |
352 | * omap_device_build_ss() after calling omap_device_count_resources(). | |
353 | * Ideally this function would not be needed at all. If omap_device | |
354 | * replaces platform_device, then we can specify our own | |
355 | * get_resource()/ get_irq()/etc functions that use the underlying | |
356 | * omap_hwmod information. Or if platform_device is extended to use | |
357 | * subarchitecture-specific function pointers, the various | |
358 | * platform_device functions can simply call omap_device internal | |
359 | * functions to get device resources. Hacking around the existing | |
360 | * platform_device code wastes memory. Returns 0. | |
361 | */ | |
362 | int omap_device_fill_resources(struct omap_device *od, struct resource *res) | |
363 | { | |
b04b65ab PW |
364 | int c = 0; |
365 | int i, r; | |
366 | ||
f39f4898 KVA |
367 | for (i = 0; i < od->hwmods_cnt; i++) { |
368 | r = omap_hwmod_fill_resources(od->hwmods[i], res); | |
b04b65ab PW |
369 | res += r; |
370 | c += r; | |
371 | } | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | /** | |
377 | * omap_device_build - build and register an omap_device with one omap_hwmod | |
378 | * @pdev_name: name of the platform_device driver to use | |
379 | * @pdev_id: this platform_device's connection ID | |
380 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
381 | * @pdata: platform_data ptr to associate with the platform_device | |
382 | * @pdata_len: amount of memory pointed to by @pdata | |
383 | * @pm_lats: pointer to a omap_device_pm_latency array for this device | |
384 | * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats | |
c23a97d3 | 385 | * @is_early_device: should the device be registered as an early device or not |
b04b65ab PW |
386 | * |
387 | * Convenience function for building and registering a single | |
388 | * omap_device record, which in turn builds and registers a | |
389 | * platform_device record. See omap_device_build_ss() for more | |
390 | * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise, | |
391 | * passes along the return value of omap_device_build_ss(). | |
392 | */ | |
393 | struct omap_device *omap_device_build(const char *pdev_name, int pdev_id, | |
394 | struct omap_hwmod *oh, void *pdata, | |
395 | int pdata_len, | |
396 | struct omap_device_pm_latency *pm_lats, | |
c23a97d3 | 397 | int pm_lats_cnt, int is_early_device) |
b04b65ab PW |
398 | { |
399 | struct omap_hwmod *ohs[] = { oh }; | |
400 | ||
401 | if (!oh) | |
402 | return ERR_PTR(-EINVAL); | |
403 | ||
404 | return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata, | |
c23a97d3 TG |
405 | pdata_len, pm_lats, pm_lats_cnt, |
406 | is_early_device); | |
b04b65ab PW |
407 | } |
408 | ||
409 | /** | |
410 | * omap_device_build_ss - build and register an omap_device with multiple hwmods | |
411 | * @pdev_name: name of the platform_device driver to use | |
412 | * @pdev_id: this platform_device's connection ID | |
413 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
414 | * @pdata: platform_data ptr to associate with the platform_device | |
415 | * @pdata_len: amount of memory pointed to by @pdata | |
416 | * @pm_lats: pointer to a omap_device_pm_latency array for this device | |
417 | * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats | |
c23a97d3 | 418 | * @is_early_device: should the device be registered as an early device or not |
b04b65ab PW |
419 | * |
420 | * Convenience function for building and registering an omap_device | |
421 | * subsystem record. Subsystem records consist of multiple | |
422 | * omap_hwmods. This function in turn builds and registers a | |
423 | * platform_device record. Returns an ERR_PTR() on error, or passes | |
424 | * along the return value of omap_device_register(). | |
425 | */ | |
426 | struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id, | |
427 | struct omap_hwmod **ohs, int oh_cnt, | |
428 | void *pdata, int pdata_len, | |
429 | struct omap_device_pm_latency *pm_lats, | |
c23a97d3 | 430 | int pm_lats_cnt, int is_early_device) |
b04b65ab PW |
431 | { |
432 | int ret = -ENOMEM; | |
433 | struct omap_device *od; | |
434 | char *pdev_name2; | |
435 | struct resource *res = NULL; | |
06563581 | 436 | int i, res_count; |
b04b65ab PW |
437 | struct omap_hwmod **hwmods; |
438 | ||
439 | if (!ohs || oh_cnt == 0 || !pdev_name) | |
440 | return ERR_PTR(-EINVAL); | |
441 | ||
442 | if (!pdata && pdata_len > 0) | |
443 | return ERR_PTR(-EINVAL); | |
444 | ||
445 | pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name, | |
446 | oh_cnt); | |
447 | ||
448 | od = kzalloc(sizeof(struct omap_device), GFP_KERNEL); | |
449 | if (!od) | |
450 | return ERR_PTR(-ENOMEM); | |
451 | ||
452 | od->hwmods_cnt = oh_cnt; | |
453 | ||
454 | hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, | |
455 | GFP_KERNEL); | |
456 | if (!hwmods) | |
457 | goto odbs_exit1; | |
458 | ||
459 | memcpy(hwmods, ohs, sizeof(struct omap_hwmod *) * oh_cnt); | |
460 | od->hwmods = hwmods; | |
461 | ||
462 | pdev_name2 = kzalloc(strlen(pdev_name) + 1, GFP_KERNEL); | |
463 | if (!pdev_name2) | |
464 | goto odbs_exit2; | |
465 | strcpy(pdev_name2, pdev_name); | |
466 | ||
467 | od->pdev.name = pdev_name2; | |
468 | od->pdev.id = pdev_id; | |
469 | ||
470 | res_count = omap_device_count_resources(od); | |
471 | if (res_count > 0) { | |
472 | res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL); | |
473 | if (!res) | |
474 | goto odbs_exit3; | |
475 | } | |
476 | omap_device_fill_resources(od, res); | |
477 | ||
478 | od->pdev.num_resources = res_count; | |
479 | od->pdev.resource = res; | |
480 | ||
49b368a6 AB |
481 | ret = platform_device_add_data(&od->pdev, pdata, pdata_len); |
482 | if (ret) | |
483 | goto odbs_exit4; | |
b04b65ab PW |
484 | |
485 | od->pm_lats = pm_lats; | |
486 | od->pm_lats_cnt = pm_lats_cnt; | |
487 | ||
c23a97d3 TG |
488 | if (is_early_device) |
489 | ret = omap_early_device_register(od); | |
490 | else | |
491 | ret = omap_device_register(od); | |
492 | ||
4ef7aca8 | 493 | for (i = 0; i < oh_cnt; i++) { |
06563581 | 494 | hwmods[i]->od = od; |
da0653fe | 495 | _add_optional_clock_clkdev(od, hwmods[i]); |
4ef7aca8 | 496 | } |
06563581 | 497 | |
b04b65ab PW |
498 | if (ret) |
499 | goto odbs_exit4; | |
500 | ||
501 | return od; | |
502 | ||
503 | odbs_exit4: | |
504 | kfree(res); | |
505 | odbs_exit3: | |
506 | kfree(pdev_name2); | |
507 | odbs_exit2: | |
508 | kfree(hwmods); | |
509 | odbs_exit1: | |
510 | kfree(od); | |
511 | ||
512 | pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret); | |
513 | ||
514 | return ERR_PTR(ret); | |
515 | } | |
516 | ||
c23a97d3 TG |
517 | /** |
518 | * omap_early_device_register - register an omap_device as an early platform | |
519 | * device. | |
520 | * @od: struct omap_device * to register | |
521 | * | |
522 | * Register the omap_device structure. This currently just calls | |
523 | * platform_early_add_device() on the underlying platform_device. | |
524 | * Returns 0 by default. | |
525 | */ | |
526 | int omap_early_device_register(struct omap_device *od) | |
527 | { | |
528 | struct platform_device *devices[1]; | |
529 | ||
530 | devices[0] = &(od->pdev); | |
531 | early_platform_add_devices(devices, 1); | |
532 | return 0; | |
533 | } | |
534 | ||
638080c3 KH |
535 | static int _od_runtime_suspend(struct device *dev) |
536 | { | |
537 | struct platform_device *pdev = to_platform_device(dev); | |
345f79b3 | 538 | int ret; |
638080c3 | 539 | |
345f79b3 KH |
540 | ret = pm_generic_runtime_suspend(dev); |
541 | ||
542 | if (!ret) | |
543 | omap_device_idle(pdev); | |
544 | ||
545 | return ret; | |
546 | } | |
547 | ||
548 | static int _od_runtime_idle(struct device *dev) | |
549 | { | |
550 | return pm_generic_runtime_idle(dev); | |
638080c3 KH |
551 | } |
552 | ||
553 | static int _od_runtime_resume(struct device *dev) | |
554 | { | |
555 | struct platform_device *pdev = to_platform_device(dev); | |
556 | ||
345f79b3 KH |
557 | omap_device_enable(pdev); |
558 | ||
559 | return pm_generic_runtime_resume(dev); | |
638080c3 KH |
560 | } |
561 | ||
562 | static struct dev_power_domain omap_device_power_domain = { | |
563 | .ops = { | |
564 | .runtime_suspend = _od_runtime_suspend, | |
345f79b3 | 565 | .runtime_idle = _od_runtime_idle, |
638080c3 KH |
566 | .runtime_resume = _od_runtime_resume, |
567 | USE_PLATFORM_PM_SLEEP_OPS | |
568 | } | |
569 | }; | |
570 | ||
b04b65ab PW |
571 | /** |
572 | * omap_device_register - register an omap_device with one omap_hwmod | |
573 | * @od: struct omap_device * to register | |
574 | * | |
575 | * Register the omap_device structure. This currently just calls | |
576 | * platform_device_register() on the underlying platform_device. | |
577 | * Returns the return value of platform_device_register(). | |
578 | */ | |
579 | int omap_device_register(struct omap_device *od) | |
580 | { | |
581 | pr_debug("omap_device: %s: registering\n", od->pdev.name); | |
582 | ||
0d5e8252 | 583 | od->pdev.dev.parent = &omap_device_parent; |
638080c3 | 584 | od->pdev.dev.pwr_domain = &omap_device_power_domain; |
b04b65ab PW |
585 | return platform_device_register(&od->pdev); |
586 | } | |
587 | ||
588 | ||
589 | /* Public functions for use by device drivers through struct platform_data */ | |
590 | ||
591 | /** | |
592 | * omap_device_enable - fully activate an omap_device | |
593 | * @od: struct omap_device * to activate | |
594 | * | |
595 | * Do whatever is necessary for the hwmods underlying omap_device @od | |
596 | * to be accessible and ready to operate. This generally involves | |
597 | * enabling clocks, setting SYSCONFIG registers; and in the future may | |
598 | * involve remuxing pins. Device drivers should call this function | |
599 | * (through platform_data function pointers) where they would normally | |
600 | * enable clocks, etc. Returns -EINVAL if called when the omap_device | |
601 | * is already enabled, or passes along the return value of | |
602 | * _omap_device_activate(). | |
603 | */ | |
604 | int omap_device_enable(struct platform_device *pdev) | |
605 | { | |
606 | int ret; | |
607 | struct omap_device *od; | |
608 | ||
8f0d69de | 609 | od = to_omap_device(pdev); |
b04b65ab PW |
610 | |
611 | if (od->_state == OMAP_DEVICE_STATE_ENABLED) { | |
24d82e34 KH |
612 | WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n", |
613 | od->pdev.name, od->pdev.id, __func__, od->_state); | |
b04b65ab PW |
614 | return -EINVAL; |
615 | } | |
616 | ||
617 | /* Enable everything if we're enabling this device from scratch */ | |
618 | if (od->_state == OMAP_DEVICE_STATE_UNKNOWN) | |
619 | od->pm_lat_level = od->pm_lats_cnt; | |
620 | ||
621 | ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT); | |
622 | ||
623 | od->dev_wakeup_lat = 0; | |
5f1b6ef7 | 624 | od->_dev_wakeup_lat_limit = UINT_MAX; |
b04b65ab PW |
625 | od->_state = OMAP_DEVICE_STATE_ENABLED; |
626 | ||
627 | return ret; | |
628 | } | |
629 | ||
630 | /** | |
631 | * omap_device_idle - idle an omap_device | |
632 | * @od: struct omap_device * to idle | |
633 | * | |
634 | * Idle omap_device @od by calling as many .deactivate_func() entries | |
635 | * in the omap_device's pm_lats table as is possible without exceeding | |
636 | * the device's maximum wakeup latency limit, pm_lat_limit. Device | |
637 | * drivers should call this function (through platform_data function | |
638 | * pointers) where they would normally disable clocks after operations | |
639 | * complete, etc.. Returns -EINVAL if the omap_device is not | |
640 | * currently enabled, or passes along the return value of | |
641 | * _omap_device_deactivate(). | |
642 | */ | |
643 | int omap_device_idle(struct platform_device *pdev) | |
644 | { | |
645 | int ret; | |
646 | struct omap_device *od; | |
647 | ||
8f0d69de | 648 | od = to_omap_device(pdev); |
b04b65ab PW |
649 | |
650 | if (od->_state != OMAP_DEVICE_STATE_ENABLED) { | |
24d82e34 KH |
651 | WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n", |
652 | od->pdev.name, od->pdev.id, __func__, od->_state); | |
b04b65ab PW |
653 | return -EINVAL; |
654 | } | |
655 | ||
656 | ret = _omap_device_deactivate(od, USE_WAKEUP_LAT); | |
657 | ||
658 | od->_state = OMAP_DEVICE_STATE_IDLE; | |
659 | ||
660 | return ret; | |
661 | } | |
662 | ||
663 | /** | |
664 | * omap_device_shutdown - shut down an omap_device | |
665 | * @od: struct omap_device * to shut down | |
666 | * | |
667 | * Shut down omap_device @od by calling all .deactivate_func() entries | |
668 | * in the omap_device's pm_lats table and then shutting down all of | |
669 | * the underlying omap_hwmods. Used when a device is being "removed" | |
670 | * or a device driver is being unloaded. Returns -EINVAL if the | |
671 | * omap_device is not currently enabled or idle, or passes along the | |
672 | * return value of _omap_device_deactivate(). | |
673 | */ | |
674 | int omap_device_shutdown(struct platform_device *pdev) | |
675 | { | |
676 | int ret, i; | |
677 | struct omap_device *od; | |
b04b65ab | 678 | |
8f0d69de | 679 | od = to_omap_device(pdev); |
b04b65ab PW |
680 | |
681 | if (od->_state != OMAP_DEVICE_STATE_ENABLED && | |
682 | od->_state != OMAP_DEVICE_STATE_IDLE) { | |
24d82e34 KH |
683 | WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n", |
684 | od->pdev.name, od->pdev.id, __func__, od->_state); | |
b04b65ab PW |
685 | return -EINVAL; |
686 | } | |
687 | ||
688 | ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT); | |
689 | ||
f39f4898 KVA |
690 | for (i = 0; i < od->hwmods_cnt; i++) |
691 | omap_hwmod_shutdown(od->hwmods[i]); | |
b04b65ab PW |
692 | |
693 | od->_state = OMAP_DEVICE_STATE_SHUTDOWN; | |
694 | ||
695 | return ret; | |
696 | } | |
697 | ||
698 | /** | |
699 | * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim | |
700 | * @od: struct omap_device * | |
701 | * | |
702 | * When a device's maximum wakeup latency limit changes, call some of | |
703 | * the .activate_func or .deactivate_func function pointers in the | |
704 | * omap_device's pm_lats array to ensure that the device's maximum | |
705 | * wakeup latency is less than or equal to the new latency limit. | |
706 | * Intended to be called by OMAP PM code whenever a device's maximum | |
707 | * wakeup latency limit changes (e.g., via | |
708 | * omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be | |
709 | * done (e.g., if the omap_device is not currently idle, or if the | |
710 | * wakeup latency is already current with the new limit) or passes | |
711 | * along the return value of _omap_device_deactivate() or | |
712 | * _omap_device_activate(). | |
713 | */ | |
714 | int omap_device_align_pm_lat(struct platform_device *pdev, | |
715 | u32 new_wakeup_lat_limit) | |
716 | { | |
717 | int ret = -EINVAL; | |
718 | struct omap_device *od; | |
719 | ||
8f0d69de | 720 | od = to_omap_device(pdev); |
b04b65ab PW |
721 | |
722 | if (new_wakeup_lat_limit == od->dev_wakeup_lat) | |
723 | return 0; | |
724 | ||
725 | od->_dev_wakeup_lat_limit = new_wakeup_lat_limit; | |
726 | ||
727 | if (od->_state != OMAP_DEVICE_STATE_IDLE) | |
728 | return 0; | |
729 | else if (new_wakeup_lat_limit > od->dev_wakeup_lat) | |
730 | ret = _omap_device_deactivate(od, USE_WAKEUP_LAT); | |
731 | else if (new_wakeup_lat_limit < od->dev_wakeup_lat) | |
732 | ret = _omap_device_activate(od, USE_WAKEUP_LAT); | |
733 | ||
734 | return ret; | |
735 | } | |
736 | ||
737 | /** | |
738 | * omap_device_get_pwrdm - return the powerdomain * associated with @od | |
739 | * @od: struct omap_device * | |
740 | * | |
741 | * Return the powerdomain associated with the first underlying | |
742 | * omap_hwmod for this omap_device. Intended for use by core OMAP PM | |
743 | * code. Returns NULL on error or a struct powerdomain * upon | |
744 | * success. | |
745 | */ | |
746 | struct powerdomain *omap_device_get_pwrdm(struct omap_device *od) | |
747 | { | |
748 | /* | |
749 | * XXX Assumes that all omap_hwmod powerdomains are identical. | |
750 | * This may not necessarily be true. There should be a sanity | |
751 | * check in here to WARN() if any difference appears. | |
752 | */ | |
753 | if (!od->hwmods_cnt) | |
754 | return NULL; | |
755 | ||
756 | return omap_hwmod_get_pwrdm(od->hwmods[0]); | |
757 | } | |
758 | ||
db2a60bf PW |
759 | /** |
760 | * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base | |
761 | * @od: struct omap_device * | |
762 | * | |
763 | * Return the MPU's virtual address for the base of the hwmod, from | |
764 | * the ioremap() that the hwmod code does. Only valid if there is one | |
765 | * hwmod associated with this device. Returns NULL if there are zero | |
766 | * or more than one hwmods associated with this omap_device; | |
767 | * otherwise, passes along the return value from | |
768 | * omap_hwmod_get_mpu_rt_va(). | |
769 | */ | |
770 | void __iomem *omap_device_get_rt_va(struct omap_device *od) | |
771 | { | |
772 | if (od->hwmods_cnt != 1) | |
773 | return NULL; | |
774 | ||
775 | return omap_hwmod_get_mpu_rt_va(od->hwmods[0]); | |
776 | } | |
777 | ||
b04b65ab PW |
778 | /* |
779 | * Public functions intended for use in omap_device_pm_latency | |
780 | * .activate_func and .deactivate_func function pointers | |
781 | */ | |
782 | ||
783 | /** | |
784 | * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods | |
785 | * @od: struct omap_device *od | |
786 | * | |
787 | * Enable all underlying hwmods. Returns 0. | |
788 | */ | |
789 | int omap_device_enable_hwmods(struct omap_device *od) | |
790 | { | |
b04b65ab PW |
791 | int i; |
792 | ||
f39f4898 KVA |
793 | for (i = 0; i < od->hwmods_cnt; i++) |
794 | omap_hwmod_enable(od->hwmods[i]); | |
b04b65ab PW |
795 | |
796 | /* XXX pass along return value here? */ | |
797 | return 0; | |
798 | } | |
799 | ||
800 | /** | |
801 | * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods | |
802 | * @od: struct omap_device *od | |
803 | * | |
804 | * Idle all underlying hwmods. Returns 0. | |
805 | */ | |
806 | int omap_device_idle_hwmods(struct omap_device *od) | |
807 | { | |
b04b65ab PW |
808 | int i; |
809 | ||
f39f4898 KVA |
810 | for (i = 0; i < od->hwmods_cnt; i++) |
811 | omap_hwmod_idle(od->hwmods[i]); | |
b04b65ab PW |
812 | |
813 | /* XXX pass along return value here? */ | |
814 | return 0; | |
815 | } | |
816 | ||
817 | /** | |
818 | * omap_device_disable_clocks - disable all main and interface clocks | |
819 | * @od: struct omap_device *od | |
820 | * | |
821 | * Disable the main functional clock and interface clock for all of the | |
822 | * omap_hwmods associated with the omap_device. Returns 0. | |
823 | */ | |
824 | int omap_device_disable_clocks(struct omap_device *od) | |
825 | { | |
b04b65ab PW |
826 | int i; |
827 | ||
f39f4898 KVA |
828 | for (i = 0; i < od->hwmods_cnt; i++) |
829 | omap_hwmod_disable_clocks(od->hwmods[i]); | |
b04b65ab PW |
830 | |
831 | /* XXX pass along return value here? */ | |
832 | return 0; | |
833 | } | |
834 | ||
835 | /** | |
836 | * omap_device_enable_clocks - enable all main and interface clocks | |
837 | * @od: struct omap_device *od | |
838 | * | |
839 | * Enable the main functional clock and interface clock for all of the | |
840 | * omap_hwmods associated with the omap_device. Returns 0. | |
841 | */ | |
842 | int omap_device_enable_clocks(struct omap_device *od) | |
843 | { | |
b04b65ab PW |
844 | int i; |
845 | ||
f39f4898 KVA |
846 | for (i = 0; i < od->hwmods_cnt; i++) |
847 | omap_hwmod_enable_clocks(od->hwmods[i]); | |
b04b65ab PW |
848 | |
849 | /* XXX pass along return value here? */ | |
850 | return 0; | |
851 | } | |
0d5e8252 KH |
852 | |
853 | struct device omap_device_parent = { | |
854 | .init_name = "omap", | |
855 | .parent = &platform_bus, | |
856 | }; | |
857 | ||
858 | static int __init omap_device_init(void) | |
859 | { | |
860 | return device_register(&omap_device_parent); | |
861 | } | |
862 | core_initcall(omap_device_init); |