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 | * | |
c1d1cd59 PW |
20 | * In the medium- to long-term, this code should be implemented as a |
21 | * proper omap_bus/omap_device in Linux, no more platform_data func | |
22 | * pointers | |
b04b65ab PW |
23 | * |
24 | * | |
b04b65ab PW |
25 | */ |
26 | #undef DEBUG | |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/platform_device.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
b04b65ab PW |
31 | #include <linux/err.h> |
32 | #include <linux/io.h> | |
4ef7aca8 | 33 | #include <linux/clk.h> |
da0653fe | 34 | #include <linux/clkdev.h> |
345f79b3 | 35 | #include <linux/pm_runtime.h> |
dc2d07eb BC |
36 | #include <linux/of.h> |
37 | #include <linux/notifier.h> | |
b04b65ab | 38 | |
b76c8b19 | 39 | #include "soc.h" |
25c7d49e | 40 | #include "omap_device.h" |
2a296c8f | 41 | #include "omap_hwmod.h" |
b04b65ab | 42 | |
b04b65ab PW |
43 | /* Private functions */ |
44 | ||
bf1e0776 BC |
45 | static void _add_clkdev(struct omap_device *od, const char *clk_alias, |
46 | const char *clk_name) | |
47 | { | |
48 | struct clk *r; | |
49 | struct clk_lookup *l; | |
50 | ||
51 | if (!clk_alias || !clk_name) | |
52 | return; | |
53 | ||
d66b3fe4 | 54 | dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name); |
bf1e0776 | 55 | |
d66b3fe4 | 56 | r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias); |
bf1e0776 | 57 | if (!IS_ERR(r)) { |
d66b3fe4 | 58 | dev_warn(&od->pdev->dev, |
49882c99 | 59 | "alias %s already exists\n", clk_alias); |
bf1e0776 BC |
60 | clk_put(r); |
61 | return; | |
62 | } | |
63 | ||
6ea74cb9 | 64 | r = clk_get(NULL, clk_name); |
bf1e0776 | 65 | if (IS_ERR(r)) { |
d66b3fe4 | 66 | dev_err(&od->pdev->dev, |
6ea74cb9 | 67 | "clk_get for %s failed\n", clk_name); |
bf1e0776 BC |
68 | return; |
69 | } | |
70 | ||
d66b3fe4 | 71 | l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev)); |
bf1e0776 | 72 | if (!l) { |
d66b3fe4 | 73 | dev_err(&od->pdev->dev, |
49882c99 | 74 | "clkdev_alloc for %s failed\n", clk_alias); |
bf1e0776 BC |
75 | return; |
76 | } | |
77 | ||
78 | clkdev_add(l); | |
79 | } | |
80 | ||
4ef7aca8 | 81 | /** |
bf1e0776 BC |
82 | * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks |
83 | * and main clock | |
4ef7aca8 | 84 | * @od: struct omap_device *od |
bf1e0776 | 85 | * @oh: struct omap_hwmod *oh |
4ef7aca8 | 86 | * |
bf1e0776 BC |
87 | * For the main clock and every optional clock present per hwmod per |
88 | * omap_device, this function adds an entry in the clkdev table of the | |
89 | * form <dev-id=dev_name, con-id=role> if it does not exist already. | |
4ef7aca8 PB |
90 | * |
91 | * The function is called from inside omap_device_build_ss(), after | |
92 | * omap_device_register. | |
93 | * | |
94 | * This allows drivers to get a pointer to its optional clocks based on its role | |
95 | * by calling clk_get(<dev*>, <role>). | |
bf1e0776 | 96 | * In the case of the main clock, a "fck" alias is used. |
4ef7aca8 PB |
97 | * |
98 | * No return value. | |
99 | */ | |
bf1e0776 BC |
100 | static void _add_hwmod_clocks_clkdev(struct omap_device *od, |
101 | struct omap_hwmod *oh) | |
4ef7aca8 PB |
102 | { |
103 | int i; | |
104 | ||
bf1e0776 | 105 | _add_clkdev(od, "fck", oh->main_clk); |
da0653fe | 106 | |
bf1e0776 BC |
107 | for (i = 0; i < oh->opt_clks_cnt; i++) |
108 | _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk); | |
4ef7aca8 PB |
109 | } |
110 | ||
b04b65ab | 111 | |
dc2d07eb BC |
112 | /** |
113 | * omap_device_build_from_dt - build an omap_device with multiple hwmods | |
114 | * @pdev_name: name of the platform_device driver to use | |
115 | * @pdev_id: this platform_device's connection ID | |
116 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
117 | * @pdata: platform_data ptr to associate with the platform_device | |
118 | * @pdata_len: amount of memory pointed to by @pdata | |
dc2d07eb BC |
119 | * |
120 | * Function for building an omap_device already registered from device-tree | |
121 | * | |
122 | * Returns 0 or PTR_ERR() on error. | |
123 | */ | |
124 | static int omap_device_build_from_dt(struct platform_device *pdev) | |
125 | { | |
126 | struct omap_hwmod **hwmods; | |
127 | struct omap_device *od; | |
128 | struct omap_hwmod *oh; | |
129 | struct device_node *node = pdev->dev.of_node; | |
130 | const char *oh_name; | |
131 | int oh_cnt, i, ret = 0; | |
7268032d | 132 | bool device_active = false; |
dc2d07eb BC |
133 | |
134 | oh_cnt = of_property_count_strings(node, "ti,hwmods"); | |
c48cd659 | 135 | if (oh_cnt <= 0) { |
5dc06b7e | 136 | dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n"); |
dc2d07eb BC |
137 | return -ENODEV; |
138 | } | |
139 | ||
140 | hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL); | |
141 | if (!hwmods) { | |
142 | ret = -ENOMEM; | |
143 | goto odbfd_exit; | |
144 | } | |
145 | ||
146 | for (i = 0; i < oh_cnt; i++) { | |
147 | of_property_read_string_index(node, "ti,hwmods", i, &oh_name); | |
148 | oh = omap_hwmod_lookup(oh_name); | |
149 | if (!oh) { | |
150 | dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n", | |
151 | oh_name); | |
152 | ret = -EINVAL; | |
153 | goto odbfd_exit1; | |
154 | } | |
155 | hwmods[i] = oh; | |
7268032d RN |
156 | if (oh->flags & HWMOD_INIT_NO_IDLE) |
157 | device_active = true; | |
dc2d07eb BC |
158 | } |
159 | ||
c1d1cd59 | 160 | od = omap_device_alloc(pdev, hwmods, oh_cnt); |
4cf9cf89 | 161 | if (IS_ERR(od)) { |
dc2d07eb BC |
162 | dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n", |
163 | oh_name); | |
164 | ret = PTR_ERR(od); | |
165 | goto odbfd_exit1; | |
166 | } | |
167 | ||
3956a1a0 PU |
168 | /* Fix up missing resource names */ |
169 | for (i = 0; i < pdev->num_resources; i++) { | |
170 | struct resource *r = &pdev->resource[i]; | |
171 | ||
172 | if (r->name == NULL) | |
173 | r->name = dev_name(&pdev->dev); | |
174 | } | |
175 | ||
dc2d07eb BC |
176 | pdev->dev.pm_domain = &omap_device_pm_domain; |
177 | ||
7268032d RN |
178 | if (device_active) { |
179 | omap_device_enable(pdev); | |
180 | pm_runtime_set_active(&pdev->dev); | |
181 | } | |
182 | ||
dc2d07eb BC |
183 | odbfd_exit1: |
184 | kfree(hwmods); | |
185 | odbfd_exit: | |
186 | return ret; | |
187 | } | |
188 | ||
189 | static int _omap_device_notifier_call(struct notifier_block *nb, | |
190 | unsigned long event, void *dev) | |
191 | { | |
192 | struct platform_device *pdev = to_platform_device(dev); | |
e753345b | 193 | struct omap_device *od; |
dc2d07eb BC |
194 | |
195 | switch (event) { | |
dc2d07eb BC |
196 | case BUS_NOTIFY_DEL_DEVICE: |
197 | if (pdev->archdata.od) | |
198 | omap_device_delete(pdev->archdata.od); | |
199 | break; | |
e753345b KH |
200 | case BUS_NOTIFY_ADD_DEVICE: |
201 | if (pdev->dev.of_node) | |
202 | omap_device_build_from_dt(pdev); | |
203 | /* fall through */ | |
204 | default: | |
205 | od = to_omap_device(pdev); | |
206 | if (od) | |
207 | od->_driver_status = event; | |
dc2d07eb BC |
208 | } |
209 | ||
210 | return NOTIFY_DONE; | |
211 | } | |
212 | ||
c1d1cd59 PW |
213 | /** |
214 | * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods | |
215 | * @od: struct omap_device *od | |
216 | * | |
217 | * Enable all underlying hwmods. Returns 0. | |
218 | */ | |
219 | static int _omap_device_enable_hwmods(struct omap_device *od) | |
220 | { | |
221 | int i; | |
222 | ||
223 | for (i = 0; i < od->hwmods_cnt; i++) | |
224 | omap_hwmod_enable(od->hwmods[i]); | |
225 | ||
226 | /* XXX pass along return value here? */ | |
227 | return 0; | |
228 | } | |
229 | ||
230 | /** | |
231 | * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods | |
232 | * @od: struct omap_device *od | |
233 | * | |
234 | * Idle all underlying hwmods. Returns 0. | |
235 | */ | |
236 | static int _omap_device_idle_hwmods(struct omap_device *od) | |
237 | { | |
238 | int i; | |
239 | ||
240 | for (i = 0; i < od->hwmods_cnt; i++) | |
241 | omap_hwmod_idle(od->hwmods[i]); | |
242 | ||
243 | /* XXX pass along return value here? */ | |
244 | return 0; | |
245 | } | |
dc2d07eb | 246 | |
b04b65ab PW |
247 | /* Public functions for use by core code */ |
248 | ||
c80705aa KH |
249 | /** |
250 | * omap_device_get_context_loss_count - get lost context count | |
251 | * @od: struct omap_device * | |
252 | * | |
253 | * Using the primary hwmod, query the context loss count for this | |
254 | * device. | |
255 | * | |
256 | * Callers should consider context for this device lost any time this | |
257 | * function returns a value different than the value the caller got | |
258 | * the last time it called this function. | |
259 | * | |
260 | * If any hwmods exist for the omap_device assoiated with @pdev, | |
261 | * return the context loss counter for that hwmod, otherwise return | |
262 | * zero. | |
263 | */ | |
fc013873 | 264 | int omap_device_get_context_loss_count(struct platform_device *pdev) |
c80705aa KH |
265 | { |
266 | struct omap_device *od; | |
267 | u32 ret = 0; | |
268 | ||
8f0d69de | 269 | od = to_omap_device(pdev); |
c80705aa KH |
270 | |
271 | if (od->hwmods_cnt) | |
272 | ret = omap_hwmod_get_context_loss_count(od->hwmods[0]); | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
b04b65ab PW |
277 | /** |
278 | * omap_device_count_resources - count number of struct resource entries needed | |
279 | * @od: struct omap_device * | |
dad4191d | 280 | * @flags: Type of resources to include when counting (IRQ/DMA/MEM) |
b04b65ab PW |
281 | * |
282 | * Count the number of struct resource entries needed for this | |
283 | * omap_device @od. Used by omap_device_build_ss() to determine how | |
284 | * much memory to allocate before calling | |
285 | * omap_device_fill_resources(). Returns the count. | |
286 | */ | |
dad4191d PU |
287 | static int omap_device_count_resources(struct omap_device *od, |
288 | unsigned long flags) | |
b04b65ab | 289 | { |
b04b65ab PW |
290 | int c = 0; |
291 | int i; | |
292 | ||
f39f4898 | 293 | for (i = 0; i < od->hwmods_cnt; i++) |
dad4191d | 294 | c += omap_hwmod_count_resources(od->hwmods[i], flags); |
b04b65ab | 295 | |
7852ec05 PW |
296 | pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n", |
297 | od->pdev->name, c, od->hwmods_cnt); | |
b04b65ab PW |
298 | |
299 | return c; | |
300 | } | |
301 | ||
302 | /** | |
303 | * omap_device_fill_resources - fill in array of struct resource | |
304 | * @od: struct omap_device * | |
305 | * @res: pointer to an array of struct resource to be filled in | |
306 | * | |
307 | * Populate one or more empty struct resource pointed to by @res with | |
308 | * the resource data for this omap_device @od. Used by | |
309 | * omap_device_build_ss() after calling omap_device_count_resources(). | |
310 | * Ideally this function would not be needed at all. If omap_device | |
311 | * replaces platform_device, then we can specify our own | |
312 | * get_resource()/ get_irq()/etc functions that use the underlying | |
313 | * omap_hwmod information. Or if platform_device is extended to use | |
314 | * subarchitecture-specific function pointers, the various | |
315 | * platform_device functions can simply call omap_device internal | |
316 | * functions to get device resources. Hacking around the existing | |
317 | * platform_device code wastes memory. Returns 0. | |
318 | */ | |
a2a28ad9 KH |
319 | static int omap_device_fill_resources(struct omap_device *od, |
320 | struct resource *res) | |
b04b65ab | 321 | { |
b04b65ab PW |
322 | int i, r; |
323 | ||
f39f4898 KVA |
324 | for (i = 0; i < od->hwmods_cnt; i++) { |
325 | r = omap_hwmod_fill_resources(od->hwmods[i], res); | |
b04b65ab | 326 | res += r; |
b04b65ab PW |
327 | } |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
b82b04e8 VH |
332 | /** |
333 | * _od_fill_dma_resources - fill in array of struct resource with dma resources | |
334 | * @od: struct omap_device * | |
335 | * @res: pointer to an array of struct resource to be filled in | |
336 | * | |
337 | * Populate one or more empty struct resource pointed to by @res with | |
338 | * the dma resource data for this omap_device @od. Used by | |
339 | * omap_device_alloc() after calling omap_device_count_resources(). | |
340 | * | |
341 | * Ideally this function would not be needed at all. If we have | |
342 | * mechanism to get dma resources from DT. | |
343 | * | |
344 | * Returns 0. | |
345 | */ | |
346 | static int _od_fill_dma_resources(struct omap_device *od, | |
347 | struct resource *res) | |
348 | { | |
349 | int i, r; | |
350 | ||
351 | for (i = 0; i < od->hwmods_cnt; i++) { | |
352 | r = omap_hwmod_fill_dma_resources(od->hwmods[i], res); | |
353 | res += r; | |
354 | } | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
a4f6cdb0 BC |
359 | /** |
360 | * omap_device_alloc - allocate an omap_device | |
361 | * @pdev: platform_device that will be included in this omap_device | |
362 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
363 | * @pdata: platform_data ptr to associate with the platform_device | |
364 | * @pdata_len: amount of memory pointed to by @pdata | |
a4f6cdb0 BC |
365 | * |
366 | * Convenience function for allocating an omap_device structure and filling | |
c1d1cd59 | 367 | * hwmods, and resources. |
a4f6cdb0 BC |
368 | * |
369 | * Returns an struct omap_device pointer or ERR_PTR() on error; | |
370 | */ | |
993e4fbd | 371 | struct omap_device *omap_device_alloc(struct platform_device *pdev, |
c1d1cd59 | 372 | struct omap_hwmod **ohs, int oh_cnt) |
a4f6cdb0 BC |
373 | { |
374 | int ret = -ENOMEM; | |
375 | struct omap_device *od; | |
376 | struct resource *res = NULL; | |
377 | int i, res_count; | |
378 | struct omap_hwmod **hwmods; | |
379 | ||
380 | od = kzalloc(sizeof(struct omap_device), GFP_KERNEL); | |
381 | if (!od) { | |
382 | ret = -ENOMEM; | |
383 | goto oda_exit1; | |
384 | } | |
385 | od->hwmods_cnt = oh_cnt; | |
386 | ||
387 | hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL); | |
388 | if (!hwmods) | |
389 | goto oda_exit2; | |
390 | ||
391 | od->hwmods = hwmods; | |
392 | od->pdev = pdev; | |
393 | ||
394 | /* | |
c567b058 PU |
395 | * Non-DT Boot: |
396 | * Here, pdev->num_resources = 0, and we should get all the | |
397 | * resources from hwmod. | |
398 | * | |
b82b04e8 VH |
399 | * DT Boot: |
400 | * OF framework will construct the resource structure (currently | |
401 | * does for MEM & IRQ resource) and we should respect/use these | |
402 | * resources, killing hwmod dependency. | |
403 | * If pdev->num_resources > 0, we assume that MEM & IRQ resources | |
404 | * have been allocated by OF layer already (through DTB). | |
c567b058 PU |
405 | * As preparation for the future we examine the OF provided resources |
406 | * to see if we have DMA resources provided already. In this case | |
407 | * there is no need to update the resources for the device, we use the | |
408 | * OF provided ones. | |
b82b04e8 VH |
409 | * |
410 | * TODO: Once DMA resource is available from OF layer, we should | |
411 | * kill filling any resources from hwmod. | |
a4f6cdb0 | 412 | */ |
c567b058 PU |
413 | if (!pdev->num_resources) { |
414 | /* Count all resources for the device */ | |
415 | res_count = omap_device_count_resources(od, IORESOURCE_IRQ | | |
416 | IORESOURCE_DMA | | |
417 | IORESOURCE_MEM); | |
418 | } else { | |
419 | /* Take a look if we already have DMA resource via DT */ | |
420 | for (i = 0; i < pdev->num_resources; i++) { | |
421 | struct resource *r = &pdev->resource[i]; | |
422 | ||
423 | /* We have it, no need to touch the resources */ | |
424 | if (r->flags == IORESOURCE_DMA) | |
425 | goto have_everything; | |
b82b04e8 | 426 | } |
c567b058 PU |
427 | /* Count only DMA resources for the device */ |
428 | res_count = omap_device_count_resources(od, IORESOURCE_DMA); | |
429 | /* The device has no DMA resource, no need for update */ | |
430 | if (!res_count) | |
431 | goto have_everything; | |
a4f6cdb0 | 432 | |
c567b058 PU |
433 | res_count += pdev->num_resources; |
434 | } | |
a4f6cdb0 | 435 | |
c567b058 PU |
436 | /* Allocate resources memory to account for new resources */ |
437 | res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL); | |
438 | if (!res) | |
439 | goto oda_exit3; | |
440 | ||
441 | if (!pdev->num_resources) { | |
442 | dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n", | |
443 | __func__, res_count); | |
444 | omap_device_fill_resources(od, res); | |
445 | } else { | |
446 | dev_dbg(&pdev->dev, | |
447 | "%s: appending %d DMA resources from hwmod\n", | |
448 | __func__, res_count - pdev->num_resources); | |
449 | memcpy(res, pdev->resource, | |
450 | sizeof(struct resource) * pdev->num_resources); | |
451 | _od_fill_dma_resources(od, &res[pdev->num_resources]); | |
a4f6cdb0 BC |
452 | } |
453 | ||
c567b058 PU |
454 | ret = platform_device_add_resources(pdev, res, res_count); |
455 | kfree(res); | |
456 | ||
457 | if (ret) | |
458 | goto oda_exit3; | |
459 | ||
460 | have_everything: | |
a4f6cdb0 BC |
461 | pdev->archdata.od = od; |
462 | ||
463 | for (i = 0; i < oh_cnt; i++) { | |
464 | hwmods[i]->od = od; | |
465 | _add_hwmod_clocks_clkdev(od, hwmods[i]); | |
466 | } | |
467 | ||
468 | return od; | |
469 | ||
470 | oda_exit3: | |
471 | kfree(hwmods); | |
472 | oda_exit2: | |
473 | kfree(od); | |
474 | oda_exit1: | |
475 | dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret); | |
476 | ||
477 | return ERR_PTR(ret); | |
478 | } | |
479 | ||
993e4fbd | 480 | void omap_device_delete(struct omap_device *od) |
a4f6cdb0 | 481 | { |
dc2d07eb BC |
482 | if (!od) |
483 | return; | |
484 | ||
a4f6cdb0 | 485 | od->pdev->archdata.od = NULL; |
a4f6cdb0 BC |
486 | kfree(od->hwmods); |
487 | kfree(od); | |
488 | } | |
489 | ||
b04b65ab PW |
490 | /** |
491 | * omap_device_build - build and register an omap_device with one omap_hwmod | |
492 | * @pdev_name: name of the platform_device driver to use | |
493 | * @pdev_id: this platform_device's connection ID | |
494 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
495 | * @pdata: platform_data ptr to associate with the platform_device | |
496 | * @pdata_len: amount of memory pointed to by @pdata | |
b04b65ab PW |
497 | * |
498 | * Convenience function for building and registering a single | |
499 | * omap_device record, which in turn builds and registers a | |
500 | * platform_device record. See omap_device_build_ss() for more | |
501 | * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise, | |
502 | * passes along the return value of omap_device_build_ss(). | |
503 | */ | |
c1d1cd59 PW |
504 | struct platform_device __init *omap_device_build(const char *pdev_name, |
505 | int pdev_id, | |
506 | struct omap_hwmod *oh, | |
507 | void *pdata, int pdata_len) | |
b04b65ab PW |
508 | { |
509 | struct omap_hwmod *ohs[] = { oh }; | |
510 | ||
511 | if (!oh) | |
512 | return ERR_PTR(-EINVAL); | |
513 | ||
514 | return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata, | |
c1d1cd59 | 515 | pdata_len); |
b04b65ab PW |
516 | } |
517 | ||
518 | /** | |
519 | * omap_device_build_ss - build and register an omap_device with multiple hwmods | |
520 | * @pdev_name: name of the platform_device driver to use | |
521 | * @pdev_id: this platform_device's connection ID | |
522 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
523 | * @pdata: platform_data ptr to associate with the platform_device | |
524 | * @pdata_len: amount of memory pointed to by @pdata | |
b04b65ab PW |
525 | * |
526 | * Convenience function for building and registering an omap_device | |
527 | * subsystem record. Subsystem records consist of multiple | |
528 | * omap_hwmods. This function in turn builds and registers a | |
529 | * platform_device record. Returns an ERR_PTR() on error, or passes | |
530 | * along the return value of omap_device_register(). | |
531 | */ | |
c1d1cd59 PW |
532 | struct platform_device __init *omap_device_build_ss(const char *pdev_name, |
533 | int pdev_id, | |
534 | struct omap_hwmod **ohs, | |
535 | int oh_cnt, void *pdata, | |
536 | int pdata_len) | |
b04b65ab PW |
537 | { |
538 | int ret = -ENOMEM; | |
d66b3fe4 | 539 | struct platform_device *pdev; |
b04b65ab | 540 | struct omap_device *od; |
b04b65ab PW |
541 | |
542 | if (!ohs || oh_cnt == 0 || !pdev_name) | |
543 | return ERR_PTR(-EINVAL); | |
544 | ||
545 | if (!pdata && pdata_len > 0) | |
546 | return ERR_PTR(-EINVAL); | |
547 | ||
d66b3fe4 KH |
548 | pdev = platform_device_alloc(pdev_name, pdev_id); |
549 | if (!pdev) { | |
550 | ret = -ENOMEM; | |
551 | goto odbs_exit; | |
552 | } | |
553 | ||
a4f6cdb0 BC |
554 | /* Set the dev_name early to allow dev_xxx in omap_device_alloc */ |
555 | if (pdev->id != -1) | |
556 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); | |
557 | else | |
558 | dev_set_name(&pdev->dev, "%s", pdev->name); | |
b04b65ab | 559 | |
c1d1cd59 | 560 | od = omap_device_alloc(pdev, ohs, oh_cnt); |
a87e6628 | 561 | if (IS_ERR(od)) |
d66b3fe4 | 562 | goto odbs_exit1; |
d66b3fe4 KH |
563 | |
564 | ret = platform_device_add_data(pdev, pdata, pdata_len); | |
49b368a6 | 565 | if (ret) |
a4f6cdb0 | 566 | goto odbs_exit2; |
b04b65ab | 567 | |
c1d1cd59 | 568 | ret = omap_device_register(pdev); |
d66b3fe4 | 569 | if (ret) |
a4f6cdb0 | 570 | goto odbs_exit2; |
06563581 | 571 | |
d66b3fe4 | 572 | return pdev; |
b04b65ab | 573 | |
d66b3fe4 | 574 | odbs_exit2: |
a4f6cdb0 | 575 | omap_device_delete(od); |
d66b3fe4 KH |
576 | odbs_exit1: |
577 | platform_device_put(pdev); | |
578 | odbs_exit: | |
b04b65ab PW |
579 | |
580 | pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret); | |
581 | ||
582 | return ERR_PTR(ret); | |
583 | } | |
584 | ||
256a5435 | 585 | #ifdef CONFIG_PM_RUNTIME |
638080c3 KH |
586 | static int _od_runtime_suspend(struct device *dev) |
587 | { | |
588 | struct platform_device *pdev = to_platform_device(dev); | |
345f79b3 | 589 | int ret; |
638080c3 | 590 | |
345f79b3 KH |
591 | ret = pm_generic_runtime_suspend(dev); |
592 | ||
593 | if (!ret) | |
594 | omap_device_idle(pdev); | |
595 | ||
596 | return ret; | |
597 | } | |
598 | ||
638080c3 KH |
599 | static int _od_runtime_resume(struct device *dev) |
600 | { | |
601 | struct platform_device *pdev = to_platform_device(dev); | |
602 | ||
345f79b3 KH |
603 | omap_device_enable(pdev); |
604 | ||
605 | return pm_generic_runtime_resume(dev); | |
638080c3 | 606 | } |
256a5435 | 607 | #endif |
638080c3 | 608 | |
c03f007a KH |
609 | #ifdef CONFIG_SUSPEND |
610 | static int _od_suspend_noirq(struct device *dev) | |
611 | { | |
612 | struct platform_device *pdev = to_platform_device(dev); | |
613 | struct omap_device *od = to_omap_device(pdev); | |
614 | int ret; | |
615 | ||
72bb6f9b KH |
616 | /* Don't attempt late suspend on a driver that is not bound */ |
617 | if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) | |
618 | return 0; | |
619 | ||
c03f007a KH |
620 | ret = pm_generic_suspend_noirq(dev); |
621 | ||
622 | if (!ret && !pm_runtime_status_suspended(dev)) { | |
623 | if (pm_generic_runtime_suspend(dev) == 0) { | |
3522bf7b | 624 | pm_runtime_set_suspended(dev); |
4b7ec5ac | 625 | omap_device_idle(pdev); |
c03f007a KH |
626 | od->flags |= OMAP_DEVICE_SUSPENDED; |
627 | } | |
628 | } | |
629 | ||
630 | return ret; | |
631 | } | |
632 | ||
633 | static int _od_resume_noirq(struct device *dev) | |
634 | { | |
635 | struct platform_device *pdev = to_platform_device(dev); | |
636 | struct omap_device *od = to_omap_device(pdev); | |
637 | ||
3522bf7b | 638 | if (od->flags & OMAP_DEVICE_SUSPENDED) { |
c03f007a | 639 | od->flags &= ~OMAP_DEVICE_SUSPENDED; |
4b7ec5ac | 640 | omap_device_enable(pdev); |
3522bf7b NM |
641 | /* |
642 | * XXX: we run before core runtime pm has resumed itself. At | |
643 | * this point in time, we just restore the runtime pm state and | |
644 | * considering symmetric operations in resume, we donot expect | |
645 | * to fail. If we failed, something changed in core runtime_pm | |
646 | * framework OR some device driver messed things up, hence, WARN | |
647 | */ | |
648 | WARN(pm_runtime_set_active(dev), | |
649 | "Could not set %s runtime state active\n", dev_name(dev)); | |
c03f007a KH |
650 | pm_generic_runtime_resume(dev); |
651 | } | |
652 | ||
653 | return pm_generic_resume_noirq(dev); | |
654 | } | |
126caf13 KH |
655 | #else |
656 | #define _od_suspend_noirq NULL | |
657 | #define _od_resume_noirq NULL | |
c03f007a KH |
658 | #endif |
659 | ||
3ec2decb | 660 | struct dev_pm_domain omap_device_pm_domain = { |
638080c3 | 661 | .ops = { |
256a5435 | 662 | SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume, |
45f0a85c | 663 | NULL) |
638080c3 | 664 | USE_PLATFORM_PM_SLEEP_OPS |
ff35336d KH |
665 | .suspend_noirq = _od_suspend_noirq, |
666 | .resume_noirq = _od_resume_noirq, | |
638080c3 KH |
667 | } |
668 | }; | |
669 | ||
b04b65ab PW |
670 | /** |
671 | * omap_device_register - register an omap_device with one omap_hwmod | |
672 | * @od: struct omap_device * to register | |
673 | * | |
674 | * Register the omap_device structure. This currently just calls | |
675 | * platform_device_register() on the underlying platform_device. | |
676 | * Returns the return value of platform_device_register(). | |
677 | */ | |
993e4fbd | 678 | int omap_device_register(struct platform_device *pdev) |
b04b65ab | 679 | { |
bfae4f8f | 680 | pr_debug("omap_device: %s: registering\n", pdev->name); |
b04b65ab | 681 | |
bfae4f8f | 682 | pdev->dev.pm_domain = &omap_device_pm_domain; |
d66b3fe4 | 683 | return platform_device_add(pdev); |
b04b65ab PW |
684 | } |
685 | ||
686 | ||
687 | /* Public functions for use by device drivers through struct platform_data */ | |
688 | ||
689 | /** | |
690 | * omap_device_enable - fully activate an omap_device | |
691 | * @od: struct omap_device * to activate | |
692 | * | |
693 | * Do whatever is necessary for the hwmods underlying omap_device @od | |
694 | * to be accessible and ready to operate. This generally involves | |
695 | * enabling clocks, setting SYSCONFIG registers; and in the future may | |
696 | * involve remuxing pins. Device drivers should call this function | |
c1d1cd59 PW |
697 | * indirectly via pm_runtime_get*(). Returns -EINVAL if called when |
698 | * the omap_device is already enabled, or passes along the return | |
699 | * value of _omap_device_enable_hwmods(). | |
b04b65ab PW |
700 | */ |
701 | int omap_device_enable(struct platform_device *pdev) | |
702 | { | |
703 | int ret; | |
704 | struct omap_device *od; | |
705 | ||
8f0d69de | 706 | od = to_omap_device(pdev); |
b04b65ab PW |
707 | |
708 | if (od->_state == OMAP_DEVICE_STATE_ENABLED) { | |
49882c99 KH |
709 | dev_warn(&pdev->dev, |
710 | "omap_device: %s() called from invalid state %d\n", | |
711 | __func__, od->_state); | |
b04b65ab PW |
712 | return -EINVAL; |
713 | } | |
714 | ||
c1d1cd59 | 715 | ret = _omap_device_enable_hwmods(od); |
b04b65ab | 716 | |
b04b65ab PW |
717 | od->_state = OMAP_DEVICE_STATE_ENABLED; |
718 | ||
719 | return ret; | |
720 | } | |
721 | ||
722 | /** | |
723 | * omap_device_idle - idle an omap_device | |
724 | * @od: struct omap_device * to idle | |
725 | * | |
c1d1cd59 PW |
726 | * Idle omap_device @od. Device drivers call this function indirectly |
727 | * via pm_runtime_put*(). Returns -EINVAL if the omap_device is not | |
b04b65ab | 728 | * currently enabled, or passes along the return value of |
c1d1cd59 | 729 | * _omap_device_idle_hwmods(). |
b04b65ab PW |
730 | */ |
731 | int omap_device_idle(struct platform_device *pdev) | |
732 | { | |
733 | int ret; | |
734 | struct omap_device *od; | |
735 | ||
8f0d69de | 736 | od = to_omap_device(pdev); |
b04b65ab PW |
737 | |
738 | if (od->_state != OMAP_DEVICE_STATE_ENABLED) { | |
49882c99 KH |
739 | dev_warn(&pdev->dev, |
740 | "omap_device: %s() called from invalid state %d\n", | |
741 | __func__, od->_state); | |
b04b65ab PW |
742 | return -EINVAL; |
743 | } | |
744 | ||
c1d1cd59 | 745 | ret = _omap_device_idle_hwmods(od); |
b04b65ab PW |
746 | |
747 | od->_state = OMAP_DEVICE_STATE_IDLE; | |
748 | ||
749 | return ret; | |
750 | } | |
751 | ||
8bb9fde2 ORL |
752 | /** |
753 | * omap_device_assert_hardreset - set a device's hardreset line | |
754 | * @pdev: struct platform_device * to reset | |
755 | * @name: const char * name of the reset line | |
756 | * | |
757 | * Set the hardreset line identified by @name on the IP blocks | |
758 | * associated with the hwmods backing the platform_device @pdev. All | |
759 | * of the hwmods associated with @pdev must have the same hardreset | |
760 | * line linked to them for this to work. Passes along the return value | |
761 | * of omap_hwmod_assert_hardreset() in the event of any failure, or | |
762 | * returns 0 upon success. | |
763 | */ | |
764 | int omap_device_assert_hardreset(struct platform_device *pdev, const char *name) | |
765 | { | |
766 | struct omap_device *od = to_omap_device(pdev); | |
767 | int ret = 0; | |
768 | int i; | |
769 | ||
770 | for (i = 0; i < od->hwmods_cnt; i++) { | |
771 | ret = omap_hwmod_assert_hardreset(od->hwmods[i], name); | |
772 | if (ret) | |
773 | break; | |
774 | } | |
775 | ||
776 | return ret; | |
777 | } | |
778 | ||
779 | /** | |
780 | * omap_device_deassert_hardreset - release a device's hardreset line | |
781 | * @pdev: struct platform_device * to reset | |
782 | * @name: const char * name of the reset line | |
783 | * | |
784 | * Release the hardreset line identified by @name on the IP blocks | |
785 | * associated with the hwmods backing the platform_device @pdev. All | |
786 | * of the hwmods associated with @pdev must have the same hardreset | |
787 | * line linked to them for this to work. Passes along the return | |
788 | * value of omap_hwmod_deassert_hardreset() in the event of any | |
789 | * failure, or returns 0 upon success. | |
790 | */ | |
791 | int omap_device_deassert_hardreset(struct platform_device *pdev, | |
792 | const char *name) | |
793 | { | |
794 | struct omap_device *od = to_omap_device(pdev); | |
795 | int ret = 0; | |
796 | int i; | |
797 | ||
798 | for (i = 0; i < od->hwmods_cnt; i++) { | |
799 | ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name); | |
800 | if (ret) | |
801 | break; | |
802 | } | |
803 | ||
804 | return ret; | |
805 | } | |
806 | ||
1f8a7d52 NM |
807 | /** |
808 | * omap_device_get_by_hwmod_name() - convert a hwmod name to | |
809 | * device pointer. | |
810 | * @oh_name: name of the hwmod device | |
811 | * | |
812 | * Returns back a struct device * pointer associated with a hwmod | |
813 | * device represented by a hwmod_name | |
814 | */ | |
815 | struct device *omap_device_get_by_hwmod_name(const char *oh_name) | |
816 | { | |
817 | struct omap_hwmod *oh; | |
818 | ||
819 | if (!oh_name) { | |
820 | WARN(1, "%s: no hwmod name!\n", __func__); | |
821 | return ERR_PTR(-EINVAL); | |
822 | } | |
823 | ||
824 | oh = omap_hwmod_lookup(oh_name); | |
857835c6 | 825 | if (!oh) { |
1f8a7d52 NM |
826 | WARN(1, "%s: no hwmod for %s\n", __func__, |
827 | oh_name); | |
857835c6 | 828 | return ERR_PTR(-ENODEV); |
1f8a7d52 | 829 | } |
857835c6 | 830 | if (!oh->od) { |
1f8a7d52 NM |
831 | WARN(1, "%s: no omap_device for %s\n", __func__, |
832 | oh_name); | |
857835c6 | 833 | return ERR_PTR(-ENODEV); |
1f8a7d52 NM |
834 | } |
835 | ||
1f8a7d52 NM |
836 | return &oh->od->pdev->dev; |
837 | } | |
0d5e8252 | 838 | |
dc2d07eb BC |
839 | static struct notifier_block platform_nb = { |
840 | .notifier_call = _omap_device_notifier_call, | |
841 | }; | |
842 | ||
0d5e8252 KH |
843 | static int __init omap_device_init(void) |
844 | { | |
dc2d07eb | 845 | bus_register_notifier(&platform_bus_type, &platform_nb); |
3ec2decb | 846 | return 0; |
0d5e8252 | 847 | } |
b76c8b19 | 848 | omap_core_initcall(omap_device_init); |
9634c8dd KH |
849 | |
850 | /** | |
851 | * omap_device_late_idle - idle devices without drivers | |
852 | * @dev: struct device * associated with omap_device | |
853 | * @data: unused | |
854 | * | |
855 | * Check the driver bound status of this device, and idle it | |
856 | * if there is no driver attached. | |
857 | */ | |
858 | static int __init omap_device_late_idle(struct device *dev, void *data) | |
859 | { | |
860 | struct platform_device *pdev = to_platform_device(dev); | |
861 | struct omap_device *od = to_omap_device(pdev); | |
f66e329d | 862 | int i; |
9634c8dd KH |
863 | |
864 | if (!od) | |
865 | return 0; | |
866 | ||
867 | /* | |
868 | * If omap_device state is enabled, but has no driver bound, | |
869 | * idle it. | |
870 | */ | |
f66e329d RN |
871 | |
872 | /* | |
873 | * Some devices (like memory controllers) are always kept | |
874 | * enabled, and should not be idled even with no drivers. | |
875 | */ | |
876 | for (i = 0; i < od->hwmods_cnt; i++) | |
877 | if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE) | |
878 | return 0; | |
879 | ||
9634c8dd KH |
880 | if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) { |
881 | if (od->_state == OMAP_DEVICE_STATE_ENABLED) { | |
882 | dev_warn(dev, "%s: enabled but no driver. Idling\n", | |
883 | __func__); | |
884 | omap_device_idle(pdev); | |
885 | } | |
886 | } | |
887 | ||
888 | return 0; | |
889 | } | |
890 | ||
891 | static int __init omap_device_late_init(void) | |
892 | { | |
893 | bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle); | |
894 | return 0; | |
895 | } | |
e7e17c53 | 896 | omap_late_initcall_sync(omap_device_late_init); |