Commit | Line | Data |
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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> | |
55581415 | 81 | #include <linux/export.h> |
b04b65ab | 82 | #include <linux/platform_device.h> |
5a0e3ad6 | 83 | #include <linux/slab.h> |
b04b65ab PW |
84 | #include <linux/err.h> |
85 | #include <linux/io.h> | |
4ef7aca8 | 86 | #include <linux/clk.h> |
da0653fe | 87 | #include <linux/clkdev.h> |
345f79b3 | 88 | #include <linux/pm_runtime.h> |
dc2d07eb BC |
89 | #include <linux/of.h> |
90 | #include <linux/notifier.h> | |
b04b65ab | 91 | |
25c7d49e | 92 | #include "omap_device.h" |
2a296c8f | 93 | #include "omap_hwmod.h" |
b04b65ab PW |
94 | |
95 | /* These parameters are passed to _omap_device_{de,}activate() */ | |
96 | #define USE_WAKEUP_LAT 0 | |
97 | #define IGNORE_WAKEUP_LAT 1 | |
98 | ||
bfae4f8f | 99 | static int omap_early_device_register(struct platform_device *pdev); |
a2a28ad9 | 100 | |
b7b5bc91 BC |
101 | static struct omap_device_pm_latency omap_default_latency[] = { |
102 | { | |
103 | .deactivate_func = omap_device_idle_hwmods, | |
104 | .activate_func = omap_device_enable_hwmods, | |
105 | .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST, | |
106 | } | |
107 | }; | |
108 | ||
b04b65ab PW |
109 | /* Private functions */ |
110 | ||
b04b65ab PW |
111 | /** |
112 | * _omap_device_activate - increase device readiness | |
113 | * @od: struct omap_device * | |
114 | * @ignore_lat: increase to latency target (0) or full readiness (1)? | |
115 | * | |
116 | * Increase readiness of omap_device @od (thus decreasing device | |
117 | * wakeup latency, but consuming more power). If @ignore_lat is | |
118 | * IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise, | |
119 | * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup | |
120 | * latency is greater than the requested maximum wakeup latency, step | |
121 | * backwards in the omap_device_pm_latency table to ensure the | |
122 | * device's maximum wakeup latency is less than or equal to the | |
123 | * requested maximum wakeup latency. Returns 0. | |
124 | */ | |
125 | static int _omap_device_activate(struct omap_device *od, u8 ignore_lat) | |
126 | { | |
f059429e | 127 | struct timespec a, b, c; |
b04b65ab | 128 | |
d66b3fe4 | 129 | dev_dbg(&od->pdev->dev, "omap_device: activating\n"); |
b04b65ab PW |
130 | |
131 | while (od->pm_lat_level > 0) { | |
132 | struct omap_device_pm_latency *odpl; | |
f059429e | 133 | unsigned long long act_lat = 0; |
b04b65ab PW |
134 | |
135 | od->pm_lat_level--; | |
136 | ||
137 | odpl = od->pm_lats + od->pm_lat_level; | |
138 | ||
139 | if (!ignore_lat && | |
140 | (od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit)) | |
141 | break; | |
142 | ||
d2292667 | 143 | read_persistent_clock(&a); |
b04b65ab PW |
144 | |
145 | /* XXX check return code */ | |
146 | odpl->activate_func(od); | |
147 | ||
d2292667 | 148 | read_persistent_clock(&b); |
b04b65ab | 149 | |
f059429e | 150 | c = timespec_sub(b, a); |
0d93d8bb | 151 | act_lat = timespec_to_ns(&c); |
b04b65ab | 152 | |
d66b3fe4 | 153 | dev_dbg(&od->pdev->dev, |
7852ec05 PW |
154 | "omap_device: pm_lat %d: activate: elapsed time %llu nsec\n", |
155 | od->pm_lat_level, act_lat); | |
b04b65ab | 156 | |
9799aca2 KH |
157 | if (act_lat > odpl->activate_lat) { |
158 | odpl->activate_lat_worst = act_lat; | |
159 | if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) { | |
160 | odpl->activate_lat = act_lat; | |
d66b3fe4 | 161 | dev_dbg(&od->pdev->dev, |
7852ec05 | 162 | "new worst case activate latency %d: %llu\n", |
47c3e5d8 | 163 | od->pm_lat_level, act_lat); |
9799aca2 | 164 | } else |
d66b3fe4 | 165 | dev_warn(&od->pdev->dev, |
7852ec05 | 166 | "activate latency %d higher than expected. (%llu > %d)\n", |
49882c99 KH |
167 | od->pm_lat_level, act_lat, |
168 | odpl->activate_lat); | |
9799aca2 | 169 | } |
b04b65ab PW |
170 | |
171 | od->dev_wakeup_lat -= odpl->activate_lat; | |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | /** | |
178 | * _omap_device_deactivate - decrease device readiness | |
179 | * @od: struct omap_device * | |
180 | * @ignore_lat: decrease to latency target (0) or full inactivity (1)? | |
181 | * | |
182 | * Decrease readiness of omap_device @od (thus increasing device | |
183 | * wakeup latency, but conserving power). If @ignore_lat is | |
184 | * IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise, | |
185 | * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup | |
186 | * latency is less than the requested maximum wakeup latency, step | |
187 | * forwards in the omap_device_pm_latency table to ensure the device's | |
188 | * maximum wakeup latency is less than or equal to the requested | |
189 | * maximum wakeup latency. Returns 0. | |
190 | */ | |
191 | static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat) | |
192 | { | |
f059429e | 193 | struct timespec a, b, c; |
b04b65ab | 194 | |
d66b3fe4 | 195 | dev_dbg(&od->pdev->dev, "omap_device: deactivating\n"); |
b04b65ab PW |
196 | |
197 | while (od->pm_lat_level < od->pm_lats_cnt) { | |
198 | struct omap_device_pm_latency *odpl; | |
f059429e | 199 | unsigned long long deact_lat = 0; |
b04b65ab PW |
200 | |
201 | odpl = od->pm_lats + od->pm_lat_level; | |
202 | ||
203 | if (!ignore_lat && | |
204 | ((od->dev_wakeup_lat + odpl->activate_lat) > | |
205 | od->_dev_wakeup_lat_limit)) | |
206 | break; | |
207 | ||
d2292667 | 208 | read_persistent_clock(&a); |
b04b65ab PW |
209 | |
210 | /* XXX check return code */ | |
211 | odpl->deactivate_func(od); | |
212 | ||
d2292667 | 213 | read_persistent_clock(&b); |
b04b65ab | 214 | |
f059429e | 215 | c = timespec_sub(b, a); |
0d93d8bb | 216 | deact_lat = timespec_to_ns(&c); |
b04b65ab | 217 | |
d66b3fe4 | 218 | dev_dbg(&od->pdev->dev, |
7852ec05 PW |
219 | "omap_device: pm_lat %d: deactivate: elapsed time %llu nsec\n", |
220 | od->pm_lat_level, deact_lat); | |
b04b65ab | 221 | |
9799aca2 KH |
222 | if (deact_lat > odpl->deactivate_lat) { |
223 | odpl->deactivate_lat_worst = deact_lat; | |
224 | if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) { | |
225 | odpl->deactivate_lat = deact_lat; | |
d66b3fe4 | 226 | dev_dbg(&od->pdev->dev, |
7852ec05 | 227 | "new worst case deactivate latency %d: %llu\n", |
47c3e5d8 | 228 | od->pm_lat_level, deact_lat); |
9799aca2 | 229 | } else |
d66b3fe4 | 230 | dev_warn(&od->pdev->dev, |
7852ec05 | 231 | "deactivate latency %d higher than expected. (%llu > %d)\n", |
49882c99 KH |
232 | od->pm_lat_level, deact_lat, |
233 | odpl->deactivate_lat); | |
9799aca2 KH |
234 | } |
235 | ||
b04b65ab PW |
236 | od->dev_wakeup_lat += odpl->activate_lat; |
237 | ||
238 | od->pm_lat_level++; | |
239 | } | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
bf1e0776 BC |
244 | static void _add_clkdev(struct omap_device *od, const char *clk_alias, |
245 | const char *clk_name) | |
246 | { | |
247 | struct clk *r; | |
248 | struct clk_lookup *l; | |
249 | ||
250 | if (!clk_alias || !clk_name) | |
251 | return; | |
252 | ||
d66b3fe4 | 253 | dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name); |
bf1e0776 | 254 | |
d66b3fe4 | 255 | r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias); |
bf1e0776 | 256 | if (!IS_ERR(r)) { |
d66b3fe4 | 257 | dev_warn(&od->pdev->dev, |
49882c99 | 258 | "alias %s already exists\n", clk_alias); |
bf1e0776 BC |
259 | clk_put(r); |
260 | return; | |
261 | } | |
262 | ||
6ea74cb9 | 263 | r = clk_get(NULL, clk_name); |
bf1e0776 | 264 | if (IS_ERR(r)) { |
d66b3fe4 | 265 | dev_err(&od->pdev->dev, |
6ea74cb9 | 266 | "clk_get for %s failed\n", clk_name); |
bf1e0776 BC |
267 | return; |
268 | } | |
269 | ||
d66b3fe4 | 270 | l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev)); |
bf1e0776 | 271 | if (!l) { |
d66b3fe4 | 272 | dev_err(&od->pdev->dev, |
49882c99 | 273 | "clkdev_alloc for %s failed\n", clk_alias); |
bf1e0776 BC |
274 | return; |
275 | } | |
276 | ||
277 | clkdev_add(l); | |
278 | } | |
279 | ||
4ef7aca8 | 280 | /** |
bf1e0776 BC |
281 | * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks |
282 | * and main clock | |
4ef7aca8 | 283 | * @od: struct omap_device *od |
bf1e0776 | 284 | * @oh: struct omap_hwmod *oh |
4ef7aca8 | 285 | * |
bf1e0776 BC |
286 | * For the main clock and every optional clock present per hwmod per |
287 | * omap_device, this function adds an entry in the clkdev table of the | |
288 | * form <dev-id=dev_name, con-id=role> if it does not exist already. | |
4ef7aca8 PB |
289 | * |
290 | * The function is called from inside omap_device_build_ss(), after | |
291 | * omap_device_register. | |
292 | * | |
293 | * This allows drivers to get a pointer to its optional clocks based on its role | |
294 | * by calling clk_get(<dev*>, <role>). | |
bf1e0776 | 295 | * In the case of the main clock, a "fck" alias is used. |
4ef7aca8 PB |
296 | * |
297 | * No return value. | |
298 | */ | |
bf1e0776 BC |
299 | static void _add_hwmod_clocks_clkdev(struct omap_device *od, |
300 | struct omap_hwmod *oh) | |
4ef7aca8 PB |
301 | { |
302 | int i; | |
303 | ||
bf1e0776 | 304 | _add_clkdev(od, "fck", oh->main_clk); |
da0653fe | 305 | |
bf1e0776 BC |
306 | for (i = 0; i < oh->opt_clks_cnt; i++) |
307 | _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk); | |
4ef7aca8 PB |
308 | } |
309 | ||
b04b65ab | 310 | |
dc2d07eb BC |
311 | /** |
312 | * omap_device_build_from_dt - build an omap_device with multiple hwmods | |
313 | * @pdev_name: name of the platform_device driver to use | |
314 | * @pdev_id: this platform_device's connection ID | |
315 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
316 | * @pdata: platform_data ptr to associate with the platform_device | |
317 | * @pdata_len: amount of memory pointed to by @pdata | |
318 | * @pm_lats: pointer to a omap_device_pm_latency array for this device | |
319 | * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats | |
320 | * @is_early_device: should the device be registered as an early device or not | |
321 | * | |
322 | * Function for building an omap_device already registered from device-tree | |
323 | * | |
324 | * Returns 0 or PTR_ERR() on error. | |
325 | */ | |
326 | static int omap_device_build_from_dt(struct platform_device *pdev) | |
327 | { | |
328 | struct omap_hwmod **hwmods; | |
329 | struct omap_device *od; | |
330 | struct omap_hwmod *oh; | |
331 | struct device_node *node = pdev->dev.of_node; | |
332 | const char *oh_name; | |
333 | int oh_cnt, i, ret = 0; | |
334 | ||
335 | oh_cnt = of_property_count_strings(node, "ti,hwmods"); | |
336 | if (!oh_cnt || IS_ERR_VALUE(oh_cnt)) { | |
5dc06b7e | 337 | dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n"); |
dc2d07eb BC |
338 | return -ENODEV; |
339 | } | |
340 | ||
341 | hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL); | |
342 | if (!hwmods) { | |
343 | ret = -ENOMEM; | |
344 | goto odbfd_exit; | |
345 | } | |
346 | ||
347 | for (i = 0; i < oh_cnt; i++) { | |
348 | of_property_read_string_index(node, "ti,hwmods", i, &oh_name); | |
349 | oh = omap_hwmod_lookup(oh_name); | |
350 | if (!oh) { | |
351 | dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n", | |
352 | oh_name); | |
353 | ret = -EINVAL; | |
354 | goto odbfd_exit1; | |
355 | } | |
356 | hwmods[i] = oh; | |
357 | } | |
358 | ||
359 | od = omap_device_alloc(pdev, hwmods, oh_cnt, NULL, 0); | |
360 | if (!od) { | |
361 | dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n", | |
362 | oh_name); | |
363 | ret = PTR_ERR(od); | |
364 | goto odbfd_exit1; | |
365 | } | |
366 | ||
3956a1a0 PU |
367 | /* Fix up missing resource names */ |
368 | for (i = 0; i < pdev->num_resources; i++) { | |
369 | struct resource *r = &pdev->resource[i]; | |
370 | ||
371 | if (r->name == NULL) | |
372 | r->name = dev_name(&pdev->dev); | |
373 | } | |
374 | ||
dc2d07eb BC |
375 | if (of_get_property(node, "ti,no_idle_on_suspend", NULL)) |
376 | omap_device_disable_idle_on_suspend(pdev); | |
377 | ||
378 | pdev->dev.pm_domain = &omap_device_pm_domain; | |
379 | ||
380 | odbfd_exit1: | |
381 | kfree(hwmods); | |
382 | odbfd_exit: | |
383 | return ret; | |
384 | } | |
385 | ||
386 | static int _omap_device_notifier_call(struct notifier_block *nb, | |
387 | unsigned long event, void *dev) | |
388 | { | |
389 | struct platform_device *pdev = to_platform_device(dev); | |
e753345b | 390 | struct omap_device *od; |
dc2d07eb BC |
391 | |
392 | switch (event) { | |
dc2d07eb BC |
393 | case BUS_NOTIFY_DEL_DEVICE: |
394 | if (pdev->archdata.od) | |
395 | omap_device_delete(pdev->archdata.od); | |
396 | break; | |
e753345b KH |
397 | case BUS_NOTIFY_ADD_DEVICE: |
398 | if (pdev->dev.of_node) | |
399 | omap_device_build_from_dt(pdev); | |
400 | /* fall through */ | |
401 | default: | |
402 | od = to_omap_device(pdev); | |
403 | if (od) | |
404 | od->_driver_status = event; | |
dc2d07eb BC |
405 | } |
406 | ||
407 | return NOTIFY_DONE; | |
408 | } | |
409 | ||
410 | ||
b04b65ab PW |
411 | /* Public functions for use by core code */ |
412 | ||
c80705aa KH |
413 | /** |
414 | * omap_device_get_context_loss_count - get lost context count | |
415 | * @od: struct omap_device * | |
416 | * | |
417 | * Using the primary hwmod, query the context loss count for this | |
418 | * device. | |
419 | * | |
420 | * Callers should consider context for this device lost any time this | |
421 | * function returns a value different than the value the caller got | |
422 | * the last time it called this function. | |
423 | * | |
424 | * If any hwmods exist for the omap_device assoiated with @pdev, | |
425 | * return the context loss counter for that hwmod, otherwise return | |
426 | * zero. | |
427 | */ | |
fc013873 | 428 | int omap_device_get_context_loss_count(struct platform_device *pdev) |
c80705aa KH |
429 | { |
430 | struct omap_device *od; | |
431 | u32 ret = 0; | |
432 | ||
8f0d69de | 433 | od = to_omap_device(pdev); |
c80705aa KH |
434 | |
435 | if (od->hwmods_cnt) | |
436 | ret = omap_hwmod_get_context_loss_count(od->hwmods[0]); | |
437 | ||
438 | return ret; | |
439 | } | |
440 | ||
b04b65ab PW |
441 | /** |
442 | * omap_device_count_resources - count number of struct resource entries needed | |
443 | * @od: struct omap_device * | |
444 | * | |
445 | * Count the number of struct resource entries needed for this | |
446 | * omap_device @od. Used by omap_device_build_ss() to determine how | |
447 | * much memory to allocate before calling | |
448 | * omap_device_fill_resources(). Returns the count. | |
449 | */ | |
a2a28ad9 | 450 | static int omap_device_count_resources(struct omap_device *od) |
b04b65ab | 451 | { |
b04b65ab PW |
452 | int c = 0; |
453 | int i; | |
454 | ||
f39f4898 KVA |
455 | for (i = 0; i < od->hwmods_cnt; i++) |
456 | c += omap_hwmod_count_resources(od->hwmods[i]); | |
b04b65ab | 457 | |
7852ec05 PW |
458 | pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n", |
459 | od->pdev->name, c, od->hwmods_cnt); | |
b04b65ab PW |
460 | |
461 | return c; | |
462 | } | |
463 | ||
464 | /** | |
465 | * omap_device_fill_resources - fill in array of struct resource | |
466 | * @od: struct omap_device * | |
467 | * @res: pointer to an array of struct resource to be filled in | |
468 | * | |
469 | * Populate one or more empty struct resource pointed to by @res with | |
470 | * the resource data for this omap_device @od. Used by | |
471 | * omap_device_build_ss() after calling omap_device_count_resources(). | |
472 | * Ideally this function would not be needed at all. If omap_device | |
473 | * replaces platform_device, then we can specify our own | |
474 | * get_resource()/ get_irq()/etc functions that use the underlying | |
475 | * omap_hwmod information. Or if platform_device is extended to use | |
476 | * subarchitecture-specific function pointers, the various | |
477 | * platform_device functions can simply call omap_device internal | |
478 | * functions to get device resources. Hacking around the existing | |
479 | * platform_device code wastes memory. Returns 0. | |
480 | */ | |
a2a28ad9 KH |
481 | static int omap_device_fill_resources(struct omap_device *od, |
482 | struct resource *res) | |
b04b65ab | 483 | { |
b04b65ab PW |
484 | int i, r; |
485 | ||
f39f4898 KVA |
486 | for (i = 0; i < od->hwmods_cnt; i++) { |
487 | r = omap_hwmod_fill_resources(od->hwmods[i], res); | |
b04b65ab | 488 | res += r; |
b04b65ab PW |
489 | } |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
b82b04e8 VH |
494 | /** |
495 | * _od_fill_dma_resources - fill in array of struct resource with dma resources | |
496 | * @od: struct omap_device * | |
497 | * @res: pointer to an array of struct resource to be filled in | |
498 | * | |
499 | * Populate one or more empty struct resource pointed to by @res with | |
500 | * the dma resource data for this omap_device @od. Used by | |
501 | * omap_device_alloc() after calling omap_device_count_resources(). | |
502 | * | |
503 | * Ideally this function would not be needed at all. If we have | |
504 | * mechanism to get dma resources from DT. | |
505 | * | |
506 | * Returns 0. | |
507 | */ | |
508 | static int _od_fill_dma_resources(struct omap_device *od, | |
509 | struct resource *res) | |
510 | { | |
511 | int i, r; | |
512 | ||
513 | for (i = 0; i < od->hwmods_cnt; i++) { | |
514 | r = omap_hwmod_fill_dma_resources(od->hwmods[i], res); | |
515 | res += r; | |
516 | } | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
a4f6cdb0 BC |
521 | /** |
522 | * omap_device_alloc - allocate an omap_device | |
523 | * @pdev: platform_device that will be included in this omap_device | |
524 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
525 | * @pdata: platform_data ptr to associate with the platform_device | |
526 | * @pdata_len: amount of memory pointed to by @pdata | |
527 | * @pm_lats: pointer to a omap_device_pm_latency array for this device | |
528 | * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats | |
529 | * | |
530 | * Convenience function for allocating an omap_device structure and filling | |
531 | * hwmods, resources and pm_latency attributes. | |
532 | * | |
533 | * Returns an struct omap_device pointer or ERR_PTR() on error; | |
534 | */ | |
993e4fbd | 535 | struct omap_device *omap_device_alloc(struct platform_device *pdev, |
a4f6cdb0 BC |
536 | struct omap_hwmod **ohs, int oh_cnt, |
537 | struct omap_device_pm_latency *pm_lats, | |
538 | int pm_lats_cnt) | |
539 | { | |
540 | int ret = -ENOMEM; | |
541 | struct omap_device *od; | |
542 | struct resource *res = NULL; | |
543 | int i, res_count; | |
544 | struct omap_hwmod **hwmods; | |
545 | ||
546 | od = kzalloc(sizeof(struct omap_device), GFP_KERNEL); | |
547 | if (!od) { | |
548 | ret = -ENOMEM; | |
549 | goto oda_exit1; | |
550 | } | |
551 | od->hwmods_cnt = oh_cnt; | |
552 | ||
553 | hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL); | |
554 | if (!hwmods) | |
555 | goto oda_exit2; | |
556 | ||
557 | od->hwmods = hwmods; | |
558 | od->pdev = pdev; | |
559 | ||
b82b04e8 | 560 | res_count = omap_device_count_resources(od); |
a4f6cdb0 | 561 | /* |
b82b04e8 VH |
562 | * DT Boot: |
563 | * OF framework will construct the resource structure (currently | |
564 | * does for MEM & IRQ resource) and we should respect/use these | |
565 | * resources, killing hwmod dependency. | |
566 | * If pdev->num_resources > 0, we assume that MEM & IRQ resources | |
567 | * have been allocated by OF layer already (through DTB). | |
568 | * | |
569 | * Non-DT Boot: | |
570 | * Here, pdev->num_resources = 0, and we should get all the | |
571 | * resources from hwmod. | |
572 | * | |
573 | * TODO: Once DMA resource is available from OF layer, we should | |
574 | * kill filling any resources from hwmod. | |
a4f6cdb0 | 575 | */ |
b82b04e8 VH |
576 | if (res_count > pdev->num_resources) { |
577 | /* Allocate resources memory to account for new resources */ | |
a4f6cdb0 BC |
578 | res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL); |
579 | if (!res) | |
580 | goto oda_exit3; | |
581 | ||
b82b04e8 VH |
582 | /* |
583 | * If pdev->num_resources > 0, then assume that, | |
584 | * MEM and IRQ resources will only come from DT and only | |
585 | * fill DMA resource from hwmod layer. | |
586 | */ | |
587 | if (pdev->num_resources && pdev->resource) { | |
588 | dev_dbg(&pdev->dev, "%s(): resources already allocated %d\n", | |
589 | __func__, res_count); | |
590 | memcpy(res, pdev->resource, | |
591 | sizeof(struct resource) * pdev->num_resources); | |
592 | _od_fill_dma_resources(od, &res[pdev->num_resources]); | |
593 | } else { | |
594 | dev_dbg(&pdev->dev, "%s(): using resources from hwmod %d\n", | |
595 | __func__, res_count); | |
596 | omap_device_fill_resources(od, res); | |
597 | } | |
a4f6cdb0 BC |
598 | |
599 | ret = platform_device_add_resources(pdev, res, res_count); | |
600 | kfree(res); | |
601 | ||
602 | if (ret) | |
603 | goto oda_exit3; | |
604 | } | |
605 | ||
606 | if (!pm_lats) { | |
607 | pm_lats = omap_default_latency; | |
608 | pm_lats_cnt = ARRAY_SIZE(omap_default_latency); | |
609 | } | |
610 | ||
611 | od->pm_lats_cnt = pm_lats_cnt; | |
612 | od->pm_lats = kmemdup(pm_lats, | |
613 | sizeof(struct omap_device_pm_latency) * pm_lats_cnt, | |
614 | GFP_KERNEL); | |
615 | if (!od->pm_lats) | |
616 | goto oda_exit3; | |
617 | ||
618 | pdev->archdata.od = od; | |
619 | ||
620 | for (i = 0; i < oh_cnt; i++) { | |
621 | hwmods[i]->od = od; | |
622 | _add_hwmod_clocks_clkdev(od, hwmods[i]); | |
623 | } | |
624 | ||
625 | return od; | |
626 | ||
627 | oda_exit3: | |
628 | kfree(hwmods); | |
629 | oda_exit2: | |
630 | kfree(od); | |
631 | oda_exit1: | |
632 | dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret); | |
633 | ||
634 | return ERR_PTR(ret); | |
635 | } | |
636 | ||
993e4fbd | 637 | void omap_device_delete(struct omap_device *od) |
a4f6cdb0 | 638 | { |
dc2d07eb BC |
639 | if (!od) |
640 | return; | |
641 | ||
a4f6cdb0 BC |
642 | od->pdev->archdata.od = NULL; |
643 | kfree(od->pm_lats); | |
644 | kfree(od->hwmods); | |
645 | kfree(od); | |
646 | } | |
647 | ||
b04b65ab PW |
648 | /** |
649 | * omap_device_build - build and register an omap_device with one omap_hwmod | |
650 | * @pdev_name: name of the platform_device driver to use | |
651 | * @pdev_id: this platform_device's connection ID | |
652 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
653 | * @pdata: platform_data ptr to associate with the platform_device | |
654 | * @pdata_len: amount of memory pointed to by @pdata | |
655 | * @pm_lats: pointer to a omap_device_pm_latency array for this device | |
656 | * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats | |
c23a97d3 | 657 | * @is_early_device: should the device be registered as an early device or not |
b04b65ab PW |
658 | * |
659 | * Convenience function for building and registering a single | |
660 | * omap_device record, which in turn builds and registers a | |
661 | * platform_device record. See omap_device_build_ss() for more | |
662 | * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise, | |
663 | * passes along the return value of omap_device_build_ss(). | |
664 | */ | |
9cf793f9 | 665 | struct platform_device __init *omap_device_build(const char *pdev_name, int pdev_id, |
b04b65ab PW |
666 | struct omap_hwmod *oh, void *pdata, |
667 | int pdata_len, | |
668 | struct omap_device_pm_latency *pm_lats, | |
c23a97d3 | 669 | int pm_lats_cnt, int is_early_device) |
b04b65ab PW |
670 | { |
671 | struct omap_hwmod *ohs[] = { oh }; | |
672 | ||
673 | if (!oh) | |
674 | return ERR_PTR(-EINVAL); | |
675 | ||
676 | return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata, | |
c23a97d3 TG |
677 | pdata_len, pm_lats, pm_lats_cnt, |
678 | is_early_device); | |
b04b65ab PW |
679 | } |
680 | ||
681 | /** | |
682 | * omap_device_build_ss - build and register an omap_device with multiple hwmods | |
683 | * @pdev_name: name of the platform_device driver to use | |
684 | * @pdev_id: this platform_device's connection ID | |
685 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
686 | * @pdata: platform_data ptr to associate with the platform_device | |
687 | * @pdata_len: amount of memory pointed to by @pdata | |
688 | * @pm_lats: pointer to a omap_device_pm_latency array for this device | |
689 | * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats | |
c23a97d3 | 690 | * @is_early_device: should the device be registered as an early device or not |
b04b65ab PW |
691 | * |
692 | * Convenience function for building and registering an omap_device | |
693 | * subsystem record. Subsystem records consist of multiple | |
694 | * omap_hwmods. This function in turn builds and registers a | |
695 | * platform_device record. Returns an ERR_PTR() on error, or passes | |
696 | * along the return value of omap_device_register(). | |
697 | */ | |
9cf793f9 | 698 | struct platform_device __init *omap_device_build_ss(const char *pdev_name, int pdev_id, |
b04b65ab PW |
699 | struct omap_hwmod **ohs, int oh_cnt, |
700 | void *pdata, int pdata_len, | |
701 | struct omap_device_pm_latency *pm_lats, | |
c23a97d3 | 702 | int pm_lats_cnt, int is_early_device) |
b04b65ab PW |
703 | { |
704 | int ret = -ENOMEM; | |
d66b3fe4 | 705 | struct platform_device *pdev; |
b04b65ab | 706 | struct omap_device *od; |
b04b65ab PW |
707 | |
708 | if (!ohs || oh_cnt == 0 || !pdev_name) | |
709 | return ERR_PTR(-EINVAL); | |
710 | ||
711 | if (!pdata && pdata_len > 0) | |
712 | return ERR_PTR(-EINVAL); | |
713 | ||
d66b3fe4 KH |
714 | pdev = platform_device_alloc(pdev_name, pdev_id); |
715 | if (!pdev) { | |
716 | ret = -ENOMEM; | |
717 | goto odbs_exit; | |
718 | } | |
719 | ||
a4f6cdb0 BC |
720 | /* Set the dev_name early to allow dev_xxx in omap_device_alloc */ |
721 | if (pdev->id != -1) | |
722 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); | |
723 | else | |
724 | dev_set_name(&pdev->dev, "%s", pdev->name); | |
b04b65ab | 725 | |
a4f6cdb0 | 726 | od = omap_device_alloc(pdev, ohs, oh_cnt, pm_lats, pm_lats_cnt); |
a87e6628 | 727 | if (IS_ERR(od)) |
d66b3fe4 | 728 | goto odbs_exit1; |
d66b3fe4 KH |
729 | |
730 | ret = platform_device_add_data(pdev, pdata, pdata_len); | |
49b368a6 | 731 | if (ret) |
a4f6cdb0 | 732 | goto odbs_exit2; |
b04b65ab | 733 | |
c23a97d3 | 734 | if (is_early_device) |
d66b3fe4 | 735 | ret = omap_early_device_register(pdev); |
c23a97d3 | 736 | else |
d66b3fe4 KH |
737 | ret = omap_device_register(pdev); |
738 | if (ret) | |
a4f6cdb0 | 739 | goto odbs_exit2; |
06563581 | 740 | |
d66b3fe4 | 741 | return pdev; |
b04b65ab | 742 | |
d66b3fe4 | 743 | odbs_exit2: |
a4f6cdb0 | 744 | omap_device_delete(od); |
d66b3fe4 KH |
745 | odbs_exit1: |
746 | platform_device_put(pdev); | |
747 | odbs_exit: | |
b04b65ab PW |
748 | |
749 | pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret); | |
750 | ||
751 | return ERR_PTR(ret); | |
752 | } | |
753 | ||
c23a97d3 TG |
754 | /** |
755 | * omap_early_device_register - register an omap_device as an early platform | |
756 | * device. | |
757 | * @od: struct omap_device * to register | |
758 | * | |
759 | * Register the omap_device structure. This currently just calls | |
760 | * platform_early_add_device() on the underlying platform_device. | |
761 | * Returns 0 by default. | |
762 | */ | |
9cf793f9 | 763 | static int __init omap_early_device_register(struct platform_device *pdev) |
c23a97d3 TG |
764 | { |
765 | struct platform_device *devices[1]; | |
766 | ||
bfae4f8f | 767 | devices[0] = pdev; |
c23a97d3 TG |
768 | early_platform_add_devices(devices, 1); |
769 | return 0; | |
770 | } | |
771 | ||
256a5435 | 772 | #ifdef CONFIG_PM_RUNTIME |
638080c3 KH |
773 | static int _od_runtime_suspend(struct device *dev) |
774 | { | |
775 | struct platform_device *pdev = to_platform_device(dev); | |
345f79b3 | 776 | int ret; |
638080c3 | 777 | |
345f79b3 KH |
778 | ret = pm_generic_runtime_suspend(dev); |
779 | ||
780 | if (!ret) | |
781 | omap_device_idle(pdev); | |
782 | ||
783 | return ret; | |
784 | } | |
785 | ||
786 | static int _od_runtime_idle(struct device *dev) | |
787 | { | |
788 | return pm_generic_runtime_idle(dev); | |
638080c3 KH |
789 | } |
790 | ||
791 | static int _od_runtime_resume(struct device *dev) | |
792 | { | |
793 | struct platform_device *pdev = to_platform_device(dev); | |
794 | ||
345f79b3 KH |
795 | omap_device_enable(pdev); |
796 | ||
797 | return pm_generic_runtime_resume(dev); | |
638080c3 | 798 | } |
256a5435 | 799 | #endif |
638080c3 | 800 | |
c03f007a KH |
801 | #ifdef CONFIG_SUSPEND |
802 | static int _od_suspend_noirq(struct device *dev) | |
803 | { | |
804 | struct platform_device *pdev = to_platform_device(dev); | |
805 | struct omap_device *od = to_omap_device(pdev); | |
806 | int ret; | |
807 | ||
72bb6f9b KH |
808 | /* Don't attempt late suspend on a driver that is not bound */ |
809 | if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) | |
810 | return 0; | |
811 | ||
c03f007a KH |
812 | ret = pm_generic_suspend_noirq(dev); |
813 | ||
814 | if (!ret && !pm_runtime_status_suspended(dev)) { | |
815 | if (pm_generic_runtime_suspend(dev) == 0) { | |
b7c39a3f PW |
816 | if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND)) |
817 | omap_device_idle(pdev); | |
c03f007a KH |
818 | od->flags |= OMAP_DEVICE_SUSPENDED; |
819 | } | |
820 | } | |
821 | ||
822 | return ret; | |
823 | } | |
824 | ||
825 | static int _od_resume_noirq(struct device *dev) | |
826 | { | |
827 | struct platform_device *pdev = to_platform_device(dev); | |
828 | struct omap_device *od = to_omap_device(pdev); | |
829 | ||
830 | if ((od->flags & OMAP_DEVICE_SUSPENDED) && | |
831 | !pm_runtime_status_suspended(dev)) { | |
832 | od->flags &= ~OMAP_DEVICE_SUSPENDED; | |
b7c39a3f PW |
833 | if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND)) |
834 | omap_device_enable(pdev); | |
c03f007a KH |
835 | pm_generic_runtime_resume(dev); |
836 | } | |
837 | ||
838 | return pm_generic_resume_noirq(dev); | |
839 | } | |
126caf13 KH |
840 | #else |
841 | #define _od_suspend_noirq NULL | |
842 | #define _od_resume_noirq NULL | |
c03f007a KH |
843 | #endif |
844 | ||
3ec2decb | 845 | struct dev_pm_domain omap_device_pm_domain = { |
638080c3 | 846 | .ops = { |
256a5435 KH |
847 | SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume, |
848 | _od_runtime_idle) | |
638080c3 | 849 | USE_PLATFORM_PM_SLEEP_OPS |
ff35336d KH |
850 | .suspend_noirq = _od_suspend_noirq, |
851 | .resume_noirq = _od_resume_noirq, | |
638080c3 KH |
852 | } |
853 | }; | |
854 | ||
b04b65ab PW |
855 | /** |
856 | * omap_device_register - register an omap_device with one omap_hwmod | |
857 | * @od: struct omap_device * to register | |
858 | * | |
859 | * Register the omap_device structure. This currently just calls | |
860 | * platform_device_register() on the underlying platform_device. | |
861 | * Returns the return value of platform_device_register(). | |
862 | */ | |
993e4fbd | 863 | int omap_device_register(struct platform_device *pdev) |
b04b65ab | 864 | { |
bfae4f8f | 865 | pr_debug("omap_device: %s: registering\n", pdev->name); |
b04b65ab | 866 | |
bfae4f8f | 867 | pdev->dev.pm_domain = &omap_device_pm_domain; |
d66b3fe4 | 868 | return platform_device_add(pdev); |
b04b65ab PW |
869 | } |
870 | ||
871 | ||
872 | /* Public functions for use by device drivers through struct platform_data */ | |
873 | ||
874 | /** | |
875 | * omap_device_enable - fully activate an omap_device | |
876 | * @od: struct omap_device * to activate | |
877 | * | |
878 | * Do whatever is necessary for the hwmods underlying omap_device @od | |
879 | * to be accessible and ready to operate. This generally involves | |
880 | * enabling clocks, setting SYSCONFIG registers; and in the future may | |
881 | * involve remuxing pins. Device drivers should call this function | |
882 | * (through platform_data function pointers) where they would normally | |
883 | * enable clocks, etc. Returns -EINVAL if called when the omap_device | |
884 | * is already enabled, or passes along the return value of | |
885 | * _omap_device_activate(). | |
886 | */ | |
887 | int omap_device_enable(struct platform_device *pdev) | |
888 | { | |
889 | int ret; | |
890 | struct omap_device *od; | |
891 | ||
8f0d69de | 892 | od = to_omap_device(pdev); |
b04b65ab PW |
893 | |
894 | if (od->_state == OMAP_DEVICE_STATE_ENABLED) { | |
49882c99 KH |
895 | dev_warn(&pdev->dev, |
896 | "omap_device: %s() called from invalid state %d\n", | |
897 | __func__, od->_state); | |
b04b65ab PW |
898 | return -EINVAL; |
899 | } | |
900 | ||
901 | /* Enable everything if we're enabling this device from scratch */ | |
902 | if (od->_state == OMAP_DEVICE_STATE_UNKNOWN) | |
903 | od->pm_lat_level = od->pm_lats_cnt; | |
904 | ||
905 | ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT); | |
906 | ||
907 | od->dev_wakeup_lat = 0; | |
5f1b6ef7 | 908 | od->_dev_wakeup_lat_limit = UINT_MAX; |
b04b65ab PW |
909 | od->_state = OMAP_DEVICE_STATE_ENABLED; |
910 | ||
911 | return ret; | |
912 | } | |
913 | ||
914 | /** | |
915 | * omap_device_idle - idle an omap_device | |
916 | * @od: struct omap_device * to idle | |
917 | * | |
918 | * Idle omap_device @od by calling as many .deactivate_func() entries | |
919 | * in the omap_device's pm_lats table as is possible without exceeding | |
920 | * the device's maximum wakeup latency limit, pm_lat_limit. Device | |
921 | * drivers should call this function (through platform_data function | |
922 | * pointers) where they would normally disable clocks after operations | |
923 | * complete, etc.. Returns -EINVAL if the omap_device is not | |
924 | * currently enabled, or passes along the return value of | |
925 | * _omap_device_deactivate(). | |
926 | */ | |
927 | int omap_device_idle(struct platform_device *pdev) | |
928 | { | |
929 | int ret; | |
930 | struct omap_device *od; | |
931 | ||
8f0d69de | 932 | od = to_omap_device(pdev); |
b04b65ab PW |
933 | |
934 | if (od->_state != OMAP_DEVICE_STATE_ENABLED) { | |
49882c99 KH |
935 | dev_warn(&pdev->dev, |
936 | "omap_device: %s() called from invalid state %d\n", | |
937 | __func__, od->_state); | |
b04b65ab PW |
938 | return -EINVAL; |
939 | } | |
940 | ||
941 | ret = _omap_device_deactivate(od, USE_WAKEUP_LAT); | |
942 | ||
943 | od->_state = OMAP_DEVICE_STATE_IDLE; | |
944 | ||
945 | return ret; | |
946 | } | |
947 | ||
948 | /** | |
949 | * omap_device_shutdown - shut down an omap_device | |
950 | * @od: struct omap_device * to shut down | |
951 | * | |
952 | * Shut down omap_device @od by calling all .deactivate_func() entries | |
953 | * in the omap_device's pm_lats table and then shutting down all of | |
954 | * the underlying omap_hwmods. Used when a device is being "removed" | |
955 | * or a device driver is being unloaded. Returns -EINVAL if the | |
956 | * omap_device is not currently enabled or idle, or passes along the | |
957 | * return value of _omap_device_deactivate(). | |
958 | */ | |
959 | int omap_device_shutdown(struct platform_device *pdev) | |
960 | { | |
961 | int ret, i; | |
962 | struct omap_device *od; | |
b04b65ab | 963 | |
8f0d69de | 964 | od = to_omap_device(pdev); |
b04b65ab PW |
965 | |
966 | if (od->_state != OMAP_DEVICE_STATE_ENABLED && | |
967 | od->_state != OMAP_DEVICE_STATE_IDLE) { | |
49882c99 KH |
968 | dev_warn(&pdev->dev, |
969 | "omap_device: %s() called from invalid state %d\n", | |
970 | __func__, od->_state); | |
b04b65ab PW |
971 | return -EINVAL; |
972 | } | |
973 | ||
974 | ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT); | |
975 | ||
f39f4898 KVA |
976 | for (i = 0; i < od->hwmods_cnt; i++) |
977 | omap_hwmod_shutdown(od->hwmods[i]); | |
b04b65ab PW |
978 | |
979 | od->_state = OMAP_DEVICE_STATE_SHUTDOWN; | |
980 | ||
981 | return ret; | |
982 | } | |
983 | ||
8bb9fde2 ORL |
984 | /** |
985 | * omap_device_assert_hardreset - set a device's hardreset line | |
986 | * @pdev: struct platform_device * to reset | |
987 | * @name: const char * name of the reset line | |
988 | * | |
989 | * Set the hardreset line identified by @name on the IP blocks | |
990 | * associated with the hwmods backing the platform_device @pdev. All | |
991 | * of the hwmods associated with @pdev must have the same hardreset | |
992 | * line linked to them for this to work. Passes along the return value | |
993 | * of omap_hwmod_assert_hardreset() in the event of any failure, or | |
994 | * returns 0 upon success. | |
995 | */ | |
996 | int omap_device_assert_hardreset(struct platform_device *pdev, const char *name) | |
997 | { | |
998 | struct omap_device *od = to_omap_device(pdev); | |
999 | int ret = 0; | |
1000 | int i; | |
1001 | ||
1002 | for (i = 0; i < od->hwmods_cnt; i++) { | |
1003 | ret = omap_hwmod_assert_hardreset(od->hwmods[i], name); | |
1004 | if (ret) | |
1005 | break; | |
1006 | } | |
1007 | ||
1008 | return ret; | |
1009 | } | |
1010 | ||
1011 | /** | |
1012 | * omap_device_deassert_hardreset - release a device's hardreset line | |
1013 | * @pdev: struct platform_device * to reset | |
1014 | * @name: const char * name of the reset line | |
1015 | * | |
1016 | * Release the hardreset line identified by @name on the IP blocks | |
1017 | * associated with the hwmods backing the platform_device @pdev. All | |
1018 | * of the hwmods associated with @pdev must have the same hardreset | |
1019 | * line linked to them for this to work. Passes along the return | |
1020 | * value of omap_hwmod_deassert_hardreset() in the event of any | |
1021 | * failure, or returns 0 upon success. | |
1022 | */ | |
1023 | int omap_device_deassert_hardreset(struct platform_device *pdev, | |
1024 | const char *name) | |
1025 | { | |
1026 | struct omap_device *od = to_omap_device(pdev); | |
1027 | int ret = 0; | |
1028 | int i; | |
1029 | ||
1030 | for (i = 0; i < od->hwmods_cnt; i++) { | |
1031 | ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name); | |
1032 | if (ret) | |
1033 | break; | |
1034 | } | |
1035 | ||
1036 | return ret; | |
1037 | } | |
1038 | ||
b04b65ab PW |
1039 | /** |
1040 | * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim | |
1041 | * @od: struct omap_device * | |
1042 | * | |
1043 | * When a device's maximum wakeup latency limit changes, call some of | |
1044 | * the .activate_func or .deactivate_func function pointers in the | |
1045 | * omap_device's pm_lats array to ensure that the device's maximum | |
1046 | * wakeup latency is less than or equal to the new latency limit. | |
1047 | * Intended to be called by OMAP PM code whenever a device's maximum | |
1048 | * wakeup latency limit changes (e.g., via | |
1049 | * omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be | |
1050 | * done (e.g., if the omap_device is not currently idle, or if the | |
1051 | * wakeup latency is already current with the new limit) or passes | |
1052 | * along the return value of _omap_device_deactivate() or | |
1053 | * _omap_device_activate(). | |
1054 | */ | |
1055 | int omap_device_align_pm_lat(struct platform_device *pdev, | |
1056 | u32 new_wakeup_lat_limit) | |
1057 | { | |
1058 | int ret = -EINVAL; | |
1059 | struct omap_device *od; | |
1060 | ||
8f0d69de | 1061 | od = to_omap_device(pdev); |
b04b65ab PW |
1062 | |
1063 | if (new_wakeup_lat_limit == od->dev_wakeup_lat) | |
1064 | return 0; | |
1065 | ||
1066 | od->_dev_wakeup_lat_limit = new_wakeup_lat_limit; | |
1067 | ||
1068 | if (od->_state != OMAP_DEVICE_STATE_IDLE) | |
1069 | return 0; | |
1070 | else if (new_wakeup_lat_limit > od->dev_wakeup_lat) | |
1071 | ret = _omap_device_deactivate(od, USE_WAKEUP_LAT); | |
1072 | else if (new_wakeup_lat_limit < od->dev_wakeup_lat) | |
1073 | ret = _omap_device_activate(od, USE_WAKEUP_LAT); | |
1074 | ||
1075 | return ret; | |
1076 | } | |
1077 | ||
1078 | /** | |
1079 | * omap_device_get_pwrdm - return the powerdomain * associated with @od | |
1080 | * @od: struct omap_device * | |
1081 | * | |
1082 | * Return the powerdomain associated with the first underlying | |
1083 | * omap_hwmod for this omap_device. Intended for use by core OMAP PM | |
1084 | * code. Returns NULL on error or a struct powerdomain * upon | |
1085 | * success. | |
1086 | */ | |
1087 | struct powerdomain *omap_device_get_pwrdm(struct omap_device *od) | |
1088 | { | |
1089 | /* | |
1090 | * XXX Assumes that all omap_hwmod powerdomains are identical. | |
1091 | * This may not necessarily be true. There should be a sanity | |
1092 | * check in here to WARN() if any difference appears. | |
1093 | */ | |
1094 | if (!od->hwmods_cnt) | |
1095 | return NULL; | |
1096 | ||
1097 | return omap_hwmod_get_pwrdm(od->hwmods[0]); | |
1098 | } | |
1099 | ||
db2a60bf PW |
1100 | /** |
1101 | * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base | |
1102 | * @od: struct omap_device * | |
1103 | * | |
1104 | * Return the MPU's virtual address for the base of the hwmod, from | |
1105 | * the ioremap() that the hwmod code does. Only valid if there is one | |
1106 | * hwmod associated with this device. Returns NULL if there are zero | |
1107 | * or more than one hwmods associated with this omap_device; | |
1108 | * otherwise, passes along the return value from | |
1109 | * omap_hwmod_get_mpu_rt_va(). | |
1110 | */ | |
1111 | void __iomem *omap_device_get_rt_va(struct omap_device *od) | |
1112 | { | |
1113 | if (od->hwmods_cnt != 1) | |
1114 | return NULL; | |
1115 | ||
1116 | return omap_hwmod_get_mpu_rt_va(od->hwmods[0]); | |
1117 | } | |
1118 | ||
1f8a7d52 NM |
1119 | /** |
1120 | * omap_device_get_by_hwmod_name() - convert a hwmod name to | |
1121 | * device pointer. | |
1122 | * @oh_name: name of the hwmod device | |
1123 | * | |
1124 | * Returns back a struct device * pointer associated with a hwmod | |
1125 | * device represented by a hwmod_name | |
1126 | */ | |
1127 | struct device *omap_device_get_by_hwmod_name(const char *oh_name) | |
1128 | { | |
1129 | struct omap_hwmod *oh; | |
1130 | ||
1131 | if (!oh_name) { | |
1132 | WARN(1, "%s: no hwmod name!\n", __func__); | |
1133 | return ERR_PTR(-EINVAL); | |
1134 | } | |
1135 | ||
1136 | oh = omap_hwmod_lookup(oh_name); | |
1137 | if (IS_ERR_OR_NULL(oh)) { | |
1138 | WARN(1, "%s: no hwmod for %s\n", __func__, | |
1139 | oh_name); | |
1140 | return ERR_PTR(oh ? PTR_ERR(oh) : -ENODEV); | |
1141 | } | |
1142 | if (IS_ERR_OR_NULL(oh->od)) { | |
1143 | WARN(1, "%s: no omap_device for %s\n", __func__, | |
1144 | oh_name); | |
1145 | return ERR_PTR(oh->od ? PTR_ERR(oh->od) : -ENODEV); | |
1146 | } | |
1147 | ||
1148 | if (IS_ERR_OR_NULL(oh->od->pdev)) | |
1149 | return ERR_PTR(oh->od->pdev ? PTR_ERR(oh->od->pdev) : -ENODEV); | |
1150 | ||
1151 | return &oh->od->pdev->dev; | |
1152 | } | |
1153 | EXPORT_SYMBOL(omap_device_get_by_hwmod_name); | |
1154 | ||
b04b65ab PW |
1155 | /* |
1156 | * Public functions intended for use in omap_device_pm_latency | |
1157 | * .activate_func and .deactivate_func function pointers | |
1158 | */ | |
1159 | ||
1160 | /** | |
1161 | * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods | |
1162 | * @od: struct omap_device *od | |
1163 | * | |
1164 | * Enable all underlying hwmods. Returns 0. | |
1165 | */ | |
1166 | int omap_device_enable_hwmods(struct omap_device *od) | |
1167 | { | |
b04b65ab PW |
1168 | int i; |
1169 | ||
f39f4898 KVA |
1170 | for (i = 0; i < od->hwmods_cnt; i++) |
1171 | omap_hwmod_enable(od->hwmods[i]); | |
b04b65ab PW |
1172 | |
1173 | /* XXX pass along return value here? */ | |
1174 | return 0; | |
1175 | } | |
1176 | ||
1177 | /** | |
1178 | * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods | |
1179 | * @od: struct omap_device *od | |
1180 | * | |
1181 | * Idle all underlying hwmods. Returns 0. | |
1182 | */ | |
1183 | int omap_device_idle_hwmods(struct omap_device *od) | |
1184 | { | |
b04b65ab PW |
1185 | int i; |
1186 | ||
f39f4898 KVA |
1187 | for (i = 0; i < od->hwmods_cnt; i++) |
1188 | omap_hwmod_idle(od->hwmods[i]); | |
b04b65ab PW |
1189 | |
1190 | /* XXX pass along return value here? */ | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | /** | |
1195 | * omap_device_disable_clocks - disable all main and interface clocks | |
1196 | * @od: struct omap_device *od | |
1197 | * | |
1198 | * Disable the main functional clock and interface clock for all of the | |
1199 | * omap_hwmods associated with the omap_device. Returns 0. | |
1200 | */ | |
1201 | int omap_device_disable_clocks(struct omap_device *od) | |
1202 | { | |
b04b65ab PW |
1203 | int i; |
1204 | ||
f39f4898 KVA |
1205 | for (i = 0; i < od->hwmods_cnt; i++) |
1206 | omap_hwmod_disable_clocks(od->hwmods[i]); | |
b04b65ab PW |
1207 | |
1208 | /* XXX pass along return value here? */ | |
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | /** | |
1213 | * omap_device_enable_clocks - enable all main and interface clocks | |
1214 | * @od: struct omap_device *od | |
1215 | * | |
1216 | * Enable the main functional clock and interface clock for all of the | |
1217 | * omap_hwmods associated with the omap_device. Returns 0. | |
1218 | */ | |
1219 | int omap_device_enable_clocks(struct omap_device *od) | |
1220 | { | |
b04b65ab PW |
1221 | int i; |
1222 | ||
f39f4898 KVA |
1223 | for (i = 0; i < od->hwmods_cnt; i++) |
1224 | omap_hwmod_enable_clocks(od->hwmods[i]); | |
b04b65ab PW |
1225 | |
1226 | /* XXX pass along return value here? */ | |
1227 | return 0; | |
1228 | } | |
0d5e8252 | 1229 | |
dc2d07eb BC |
1230 | static struct notifier_block platform_nb = { |
1231 | .notifier_call = _omap_device_notifier_call, | |
1232 | }; | |
1233 | ||
0d5e8252 KH |
1234 | static int __init omap_device_init(void) |
1235 | { | |
dc2d07eb | 1236 | bus_register_notifier(&platform_bus_type, &platform_nb); |
3ec2decb | 1237 | return 0; |
0d5e8252 KH |
1238 | } |
1239 | core_initcall(omap_device_init); | |
9634c8dd KH |
1240 | |
1241 | /** | |
1242 | * omap_device_late_idle - idle devices without drivers | |
1243 | * @dev: struct device * associated with omap_device | |
1244 | * @data: unused | |
1245 | * | |
1246 | * Check the driver bound status of this device, and idle it | |
1247 | * if there is no driver attached. | |
1248 | */ | |
1249 | static int __init omap_device_late_idle(struct device *dev, void *data) | |
1250 | { | |
1251 | struct platform_device *pdev = to_platform_device(dev); | |
1252 | struct omap_device *od = to_omap_device(pdev); | |
1253 | ||
1254 | if (!od) | |
1255 | return 0; | |
1256 | ||
1257 | /* | |
1258 | * If omap_device state is enabled, but has no driver bound, | |
1259 | * idle it. | |
1260 | */ | |
1261 | if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) { | |
1262 | if (od->_state == OMAP_DEVICE_STATE_ENABLED) { | |
1263 | dev_warn(dev, "%s: enabled but no driver. Idling\n", | |
1264 | __func__); | |
1265 | omap_device_idle(pdev); | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | static int __init omap_device_late_init(void) | |
1273 | { | |
1274 | bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle); | |
1275 | return 0; | |
1276 | } | |
1277 | late_initcall(omap_device_late_init); |