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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 | |
dad12d11 | 39 | #include "common.h" |
b76c8b19 | 40 | #include "soc.h" |
25c7d49e | 41 | #include "omap_device.h" |
2a296c8f | 42 | #include "omap_hwmod.h" |
b04b65ab | 43 | |
b04b65ab PW |
44 | /* Private functions */ |
45 | ||
bf1e0776 BC |
46 | static void _add_clkdev(struct omap_device *od, const char *clk_alias, |
47 | const char *clk_name) | |
48 | { | |
49 | struct clk *r; | |
50 | struct clk_lookup *l; | |
51 | ||
52 | if (!clk_alias || !clk_name) | |
53 | return; | |
54 | ||
d66b3fe4 | 55 | dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name); |
bf1e0776 | 56 | |
d66b3fe4 | 57 | r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias); |
bf1e0776 | 58 | if (!IS_ERR(r)) { |
9a02ae4e | 59 | dev_dbg(&od->pdev->dev, |
49882c99 | 60 | "alias %s already exists\n", clk_alias); |
bf1e0776 BC |
61 | clk_put(r); |
62 | return; | |
63 | } | |
64 | ||
6ea74cb9 | 65 | r = clk_get(NULL, clk_name); |
bf1e0776 | 66 | if (IS_ERR(r)) { |
d66b3fe4 | 67 | dev_err(&od->pdev->dev, |
6ea74cb9 | 68 | "clk_get for %s failed\n", clk_name); |
bf1e0776 BC |
69 | return; |
70 | } | |
71 | ||
d66b3fe4 | 72 | l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev)); |
bf1e0776 | 73 | if (!l) { |
d66b3fe4 | 74 | dev_err(&od->pdev->dev, |
49882c99 | 75 | "clkdev_alloc for %s failed\n", clk_alias); |
bf1e0776 BC |
76 | return; |
77 | } | |
78 | ||
79 | clkdev_add(l); | |
80 | } | |
81 | ||
4ef7aca8 | 82 | /** |
bf1e0776 BC |
83 | * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks |
84 | * and main clock | |
4ef7aca8 | 85 | * @od: struct omap_device *od |
bf1e0776 | 86 | * @oh: struct omap_hwmod *oh |
4ef7aca8 | 87 | * |
bf1e0776 BC |
88 | * For the main clock and every optional clock present per hwmod per |
89 | * omap_device, this function adds an entry in the clkdev table of the | |
90 | * form <dev-id=dev_name, con-id=role> if it does not exist already. | |
4ef7aca8 PB |
91 | * |
92 | * The function is called from inside omap_device_build_ss(), after | |
93 | * omap_device_register. | |
94 | * | |
95 | * This allows drivers to get a pointer to its optional clocks based on its role | |
96 | * by calling clk_get(<dev*>, <role>). | |
bf1e0776 | 97 | * In the case of the main clock, a "fck" alias is used. |
4ef7aca8 PB |
98 | * |
99 | * No return value. | |
100 | */ | |
bf1e0776 BC |
101 | static void _add_hwmod_clocks_clkdev(struct omap_device *od, |
102 | struct omap_hwmod *oh) | |
4ef7aca8 PB |
103 | { |
104 | int i; | |
105 | ||
bf1e0776 | 106 | _add_clkdev(od, "fck", oh->main_clk); |
da0653fe | 107 | |
bf1e0776 BC |
108 | for (i = 0; i < oh->opt_clks_cnt; i++) |
109 | _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk); | |
4ef7aca8 PB |
110 | } |
111 | ||
b04b65ab | 112 | |
dc2d07eb BC |
113 | /** |
114 | * omap_device_build_from_dt - build an omap_device with multiple hwmods | |
115 | * @pdev_name: name of the platform_device driver to use | |
116 | * @pdev_id: this platform_device's connection ID | |
117 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
118 | * @pdata: platform_data ptr to associate with the platform_device | |
119 | * @pdata_len: amount of memory pointed to by @pdata | |
dc2d07eb BC |
120 | * |
121 | * Function for building an omap_device already registered from device-tree | |
122 | * | |
123 | * Returns 0 or PTR_ERR() on error. | |
124 | */ | |
125 | static int omap_device_build_from_dt(struct platform_device *pdev) | |
126 | { | |
127 | struct omap_hwmod **hwmods; | |
128 | struct omap_device *od; | |
129 | struct omap_hwmod *oh; | |
130 | struct device_node *node = pdev->dev.of_node; | |
131 | const char *oh_name; | |
132 | int oh_cnt, i, ret = 0; | |
7268032d | 133 | bool device_active = false; |
dc2d07eb BC |
134 | |
135 | oh_cnt = of_property_count_strings(node, "ti,hwmods"); | |
c48cd659 | 136 | if (oh_cnt <= 0) { |
5dc06b7e | 137 | dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n"); |
dc2d07eb BC |
138 | return -ENODEV; |
139 | } | |
140 | ||
141 | hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL); | |
142 | if (!hwmods) { | |
143 | ret = -ENOMEM; | |
144 | goto odbfd_exit; | |
145 | } | |
146 | ||
147 | for (i = 0; i < oh_cnt; i++) { | |
148 | of_property_read_string_index(node, "ti,hwmods", i, &oh_name); | |
149 | oh = omap_hwmod_lookup(oh_name); | |
150 | if (!oh) { | |
151 | dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n", | |
152 | oh_name); | |
153 | ret = -EINVAL; | |
154 | goto odbfd_exit1; | |
155 | } | |
156 | hwmods[i] = oh; | |
7268032d RN |
157 | if (oh->flags & HWMOD_INIT_NO_IDLE) |
158 | device_active = true; | |
dc2d07eb BC |
159 | } |
160 | ||
c1d1cd59 | 161 | od = omap_device_alloc(pdev, hwmods, oh_cnt); |
4cf9cf89 | 162 | if (IS_ERR(od)) { |
dc2d07eb BC |
163 | dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n", |
164 | oh_name); | |
165 | ret = PTR_ERR(od); | |
166 | goto odbfd_exit1; | |
167 | } | |
168 | ||
3956a1a0 PU |
169 | /* Fix up missing resource names */ |
170 | for (i = 0; i < pdev->num_resources; i++) { | |
171 | struct resource *r = &pdev->resource[i]; | |
172 | ||
173 | if (r->name == NULL) | |
174 | r->name = dev_name(&pdev->dev); | |
175 | } | |
176 | ||
dc2d07eb BC |
177 | pdev->dev.pm_domain = &omap_device_pm_domain; |
178 | ||
7268032d RN |
179 | if (device_active) { |
180 | omap_device_enable(pdev); | |
181 | pm_runtime_set_active(&pdev->dev); | |
182 | } | |
183 | ||
dc2d07eb BC |
184 | odbfd_exit1: |
185 | kfree(hwmods); | |
186 | odbfd_exit: | |
f5c33b07 NM |
187 | /* if data/we are at fault.. load up a fail handler */ |
188 | if (ret) | |
189 | pdev->dev.pm_domain = &omap_device_fail_pm_domain; | |
190 | ||
dc2d07eb BC |
191 | return ret; |
192 | } | |
193 | ||
194 | static int _omap_device_notifier_call(struct notifier_block *nb, | |
195 | unsigned long event, void *dev) | |
196 | { | |
197 | struct platform_device *pdev = to_platform_device(dev); | |
e753345b | 198 | struct omap_device *od; |
dc2d07eb BC |
199 | |
200 | switch (event) { | |
dc2d07eb BC |
201 | case BUS_NOTIFY_DEL_DEVICE: |
202 | if (pdev->archdata.od) | |
203 | omap_device_delete(pdev->archdata.od); | |
204 | break; | |
e753345b KH |
205 | case BUS_NOTIFY_ADD_DEVICE: |
206 | if (pdev->dev.of_node) | |
207 | omap_device_build_from_dt(pdev); | |
dad12d11 | 208 | omap_auxdata_legacy_init(dev); |
e753345b KH |
209 | /* fall through */ |
210 | default: | |
211 | od = to_omap_device(pdev); | |
212 | if (od) | |
213 | od->_driver_status = event; | |
dc2d07eb BC |
214 | } |
215 | ||
216 | return NOTIFY_DONE; | |
217 | } | |
218 | ||
c1d1cd59 PW |
219 | /** |
220 | * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods | |
221 | * @od: struct omap_device *od | |
222 | * | |
223 | * Enable all underlying hwmods. Returns 0. | |
224 | */ | |
225 | static int _omap_device_enable_hwmods(struct omap_device *od) | |
226 | { | |
227 | int i; | |
228 | ||
229 | for (i = 0; i < od->hwmods_cnt; i++) | |
230 | omap_hwmod_enable(od->hwmods[i]); | |
231 | ||
232 | /* XXX pass along return value here? */ | |
233 | return 0; | |
234 | } | |
235 | ||
236 | /** | |
237 | * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods | |
238 | * @od: struct omap_device *od | |
239 | * | |
240 | * Idle all underlying hwmods. Returns 0. | |
241 | */ | |
242 | static int _omap_device_idle_hwmods(struct omap_device *od) | |
243 | { | |
244 | int i; | |
245 | ||
246 | for (i = 0; i < od->hwmods_cnt; i++) | |
247 | omap_hwmod_idle(od->hwmods[i]); | |
248 | ||
249 | /* XXX pass along return value here? */ | |
250 | return 0; | |
251 | } | |
dc2d07eb | 252 | |
b04b65ab PW |
253 | /* Public functions for use by core code */ |
254 | ||
c80705aa KH |
255 | /** |
256 | * omap_device_get_context_loss_count - get lost context count | |
257 | * @od: struct omap_device * | |
258 | * | |
259 | * Using the primary hwmod, query the context loss count for this | |
260 | * device. | |
261 | * | |
262 | * Callers should consider context for this device lost any time this | |
263 | * function returns a value different than the value the caller got | |
264 | * the last time it called this function. | |
265 | * | |
266 | * If any hwmods exist for the omap_device assoiated with @pdev, | |
267 | * return the context loss counter for that hwmod, otherwise return | |
268 | * zero. | |
269 | */ | |
fc013873 | 270 | int omap_device_get_context_loss_count(struct platform_device *pdev) |
c80705aa KH |
271 | { |
272 | struct omap_device *od; | |
273 | u32 ret = 0; | |
274 | ||
8f0d69de | 275 | od = to_omap_device(pdev); |
c80705aa KH |
276 | |
277 | if (od->hwmods_cnt) | |
278 | ret = omap_hwmod_get_context_loss_count(od->hwmods[0]); | |
279 | ||
280 | return ret; | |
281 | } | |
282 | ||
b04b65ab PW |
283 | /** |
284 | * omap_device_count_resources - count number of struct resource entries needed | |
285 | * @od: struct omap_device * | |
dad4191d | 286 | * @flags: Type of resources to include when counting (IRQ/DMA/MEM) |
b04b65ab PW |
287 | * |
288 | * Count the number of struct resource entries needed for this | |
289 | * omap_device @od. Used by omap_device_build_ss() to determine how | |
290 | * much memory to allocate before calling | |
291 | * omap_device_fill_resources(). Returns the count. | |
292 | */ | |
dad4191d PU |
293 | static int omap_device_count_resources(struct omap_device *od, |
294 | unsigned long flags) | |
b04b65ab | 295 | { |
b04b65ab PW |
296 | int c = 0; |
297 | int i; | |
298 | ||
f39f4898 | 299 | for (i = 0; i < od->hwmods_cnt; i++) |
dad4191d | 300 | c += omap_hwmod_count_resources(od->hwmods[i], flags); |
b04b65ab | 301 | |
7852ec05 PW |
302 | pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n", |
303 | od->pdev->name, c, od->hwmods_cnt); | |
b04b65ab PW |
304 | |
305 | return c; | |
306 | } | |
307 | ||
308 | /** | |
309 | * omap_device_fill_resources - fill in array of struct resource | |
310 | * @od: struct omap_device * | |
311 | * @res: pointer to an array of struct resource to be filled in | |
312 | * | |
313 | * Populate one or more empty struct resource pointed to by @res with | |
314 | * the resource data for this omap_device @od. Used by | |
315 | * omap_device_build_ss() after calling omap_device_count_resources(). | |
316 | * Ideally this function would not be needed at all. If omap_device | |
317 | * replaces platform_device, then we can specify our own | |
318 | * get_resource()/ get_irq()/etc functions that use the underlying | |
319 | * omap_hwmod information. Or if platform_device is extended to use | |
320 | * subarchitecture-specific function pointers, the various | |
321 | * platform_device functions can simply call omap_device internal | |
322 | * functions to get device resources. Hacking around the existing | |
323 | * platform_device code wastes memory. Returns 0. | |
324 | */ | |
a2a28ad9 KH |
325 | static int omap_device_fill_resources(struct omap_device *od, |
326 | struct resource *res) | |
b04b65ab | 327 | { |
b04b65ab PW |
328 | int i, r; |
329 | ||
f39f4898 KVA |
330 | for (i = 0; i < od->hwmods_cnt; i++) { |
331 | r = omap_hwmod_fill_resources(od->hwmods[i], res); | |
b04b65ab | 332 | res += r; |
b04b65ab PW |
333 | } |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
b82b04e8 VH |
338 | /** |
339 | * _od_fill_dma_resources - fill in array of struct resource with dma resources | |
340 | * @od: struct omap_device * | |
341 | * @res: pointer to an array of struct resource to be filled in | |
342 | * | |
343 | * Populate one or more empty struct resource pointed to by @res with | |
344 | * the dma resource data for this omap_device @od. Used by | |
345 | * omap_device_alloc() after calling omap_device_count_resources(). | |
346 | * | |
347 | * Ideally this function would not be needed at all. If we have | |
348 | * mechanism to get dma resources from DT. | |
349 | * | |
350 | * Returns 0. | |
351 | */ | |
352 | static int _od_fill_dma_resources(struct omap_device *od, | |
353 | struct resource *res) | |
354 | { | |
355 | int i, r; | |
356 | ||
357 | for (i = 0; i < od->hwmods_cnt; i++) { | |
358 | r = omap_hwmod_fill_dma_resources(od->hwmods[i], res); | |
359 | res += r; | |
360 | } | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
a4f6cdb0 BC |
365 | /** |
366 | * omap_device_alloc - allocate an omap_device | |
367 | * @pdev: platform_device that will be included in this omap_device | |
368 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
369 | * @pdata: platform_data ptr to associate with the platform_device | |
370 | * @pdata_len: amount of memory pointed to by @pdata | |
a4f6cdb0 BC |
371 | * |
372 | * Convenience function for allocating an omap_device structure and filling | |
c1d1cd59 | 373 | * hwmods, and resources. |
a4f6cdb0 BC |
374 | * |
375 | * Returns an struct omap_device pointer or ERR_PTR() on error; | |
376 | */ | |
993e4fbd | 377 | struct omap_device *omap_device_alloc(struct platform_device *pdev, |
c1d1cd59 | 378 | struct omap_hwmod **ohs, int oh_cnt) |
a4f6cdb0 BC |
379 | { |
380 | int ret = -ENOMEM; | |
381 | struct omap_device *od; | |
382 | struct resource *res = NULL; | |
383 | int i, res_count; | |
384 | struct omap_hwmod **hwmods; | |
385 | ||
386 | od = kzalloc(sizeof(struct omap_device), GFP_KERNEL); | |
387 | if (!od) { | |
388 | ret = -ENOMEM; | |
389 | goto oda_exit1; | |
390 | } | |
391 | od->hwmods_cnt = oh_cnt; | |
392 | ||
393 | hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL); | |
394 | if (!hwmods) | |
395 | goto oda_exit2; | |
396 | ||
397 | od->hwmods = hwmods; | |
398 | od->pdev = pdev; | |
399 | ||
400 | /* | |
c567b058 PU |
401 | * Non-DT Boot: |
402 | * Here, pdev->num_resources = 0, and we should get all the | |
403 | * resources from hwmod. | |
404 | * | |
b82b04e8 VH |
405 | * DT Boot: |
406 | * OF framework will construct the resource structure (currently | |
407 | * does for MEM & IRQ resource) and we should respect/use these | |
408 | * resources, killing hwmod dependency. | |
409 | * If pdev->num_resources > 0, we assume that MEM & IRQ resources | |
410 | * have been allocated by OF layer already (through DTB). | |
c567b058 PU |
411 | * As preparation for the future we examine the OF provided resources |
412 | * to see if we have DMA resources provided already. In this case | |
413 | * there is no need to update the resources for the device, we use the | |
414 | * OF provided ones. | |
b82b04e8 VH |
415 | * |
416 | * TODO: Once DMA resource is available from OF layer, we should | |
417 | * kill filling any resources from hwmod. | |
a4f6cdb0 | 418 | */ |
c567b058 PU |
419 | if (!pdev->num_resources) { |
420 | /* Count all resources for the device */ | |
421 | res_count = omap_device_count_resources(od, IORESOURCE_IRQ | | |
422 | IORESOURCE_DMA | | |
423 | IORESOURCE_MEM); | |
424 | } else { | |
425 | /* Take a look if we already have DMA resource via DT */ | |
426 | for (i = 0; i < pdev->num_resources; i++) { | |
427 | struct resource *r = &pdev->resource[i]; | |
428 | ||
429 | /* We have it, no need to touch the resources */ | |
430 | if (r->flags == IORESOURCE_DMA) | |
431 | goto have_everything; | |
b82b04e8 | 432 | } |
c567b058 PU |
433 | /* Count only DMA resources for the device */ |
434 | res_count = omap_device_count_resources(od, IORESOURCE_DMA); | |
435 | /* The device has no DMA resource, no need for update */ | |
436 | if (!res_count) | |
437 | goto have_everything; | |
a4f6cdb0 | 438 | |
c567b058 PU |
439 | res_count += pdev->num_resources; |
440 | } | |
a4f6cdb0 | 441 | |
c567b058 PU |
442 | /* Allocate resources memory to account for new resources */ |
443 | res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL); | |
444 | if (!res) | |
445 | goto oda_exit3; | |
446 | ||
447 | if (!pdev->num_resources) { | |
448 | dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n", | |
449 | __func__, res_count); | |
450 | omap_device_fill_resources(od, res); | |
451 | } else { | |
452 | dev_dbg(&pdev->dev, | |
453 | "%s: appending %d DMA resources from hwmod\n", | |
454 | __func__, res_count - pdev->num_resources); | |
455 | memcpy(res, pdev->resource, | |
456 | sizeof(struct resource) * pdev->num_resources); | |
457 | _od_fill_dma_resources(od, &res[pdev->num_resources]); | |
a4f6cdb0 BC |
458 | } |
459 | ||
c567b058 PU |
460 | ret = platform_device_add_resources(pdev, res, res_count); |
461 | kfree(res); | |
462 | ||
463 | if (ret) | |
464 | goto oda_exit3; | |
465 | ||
466 | have_everything: | |
a4f6cdb0 BC |
467 | pdev->archdata.od = od; |
468 | ||
469 | for (i = 0; i < oh_cnt; i++) { | |
470 | hwmods[i]->od = od; | |
471 | _add_hwmod_clocks_clkdev(od, hwmods[i]); | |
472 | } | |
473 | ||
474 | return od; | |
475 | ||
476 | oda_exit3: | |
477 | kfree(hwmods); | |
478 | oda_exit2: | |
479 | kfree(od); | |
480 | oda_exit1: | |
481 | dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret); | |
482 | ||
483 | return ERR_PTR(ret); | |
484 | } | |
485 | ||
993e4fbd | 486 | void omap_device_delete(struct omap_device *od) |
a4f6cdb0 | 487 | { |
dc2d07eb BC |
488 | if (!od) |
489 | return; | |
490 | ||
a4f6cdb0 | 491 | od->pdev->archdata.od = NULL; |
a4f6cdb0 BC |
492 | kfree(od->hwmods); |
493 | kfree(od); | |
494 | } | |
495 | ||
b04b65ab PW |
496 | /** |
497 | * omap_device_build - build and register an omap_device with one omap_hwmod | |
498 | * @pdev_name: name of the platform_device driver to use | |
499 | * @pdev_id: this platform_device's connection ID | |
500 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
501 | * @pdata: platform_data ptr to associate with the platform_device | |
502 | * @pdata_len: amount of memory pointed to by @pdata | |
b04b65ab PW |
503 | * |
504 | * Convenience function for building and registering a single | |
505 | * omap_device record, which in turn builds and registers a | |
506 | * platform_device record. See omap_device_build_ss() for more | |
507 | * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise, | |
508 | * passes along the return value of omap_device_build_ss(). | |
509 | */ | |
c1d1cd59 PW |
510 | struct platform_device __init *omap_device_build(const char *pdev_name, |
511 | int pdev_id, | |
512 | struct omap_hwmod *oh, | |
513 | void *pdata, int pdata_len) | |
b04b65ab PW |
514 | { |
515 | struct omap_hwmod *ohs[] = { oh }; | |
516 | ||
517 | if (!oh) | |
518 | return ERR_PTR(-EINVAL); | |
519 | ||
520 | return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata, | |
c1d1cd59 | 521 | pdata_len); |
b04b65ab PW |
522 | } |
523 | ||
524 | /** | |
525 | * omap_device_build_ss - build and register an omap_device with multiple hwmods | |
526 | * @pdev_name: name of the platform_device driver to use | |
527 | * @pdev_id: this platform_device's connection ID | |
528 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
529 | * @pdata: platform_data ptr to associate with the platform_device | |
530 | * @pdata_len: amount of memory pointed to by @pdata | |
b04b65ab PW |
531 | * |
532 | * Convenience function for building and registering an omap_device | |
533 | * subsystem record. Subsystem records consist of multiple | |
534 | * omap_hwmods. This function in turn builds and registers a | |
535 | * platform_device record. Returns an ERR_PTR() on error, or passes | |
536 | * along the return value of omap_device_register(). | |
537 | */ | |
c1d1cd59 PW |
538 | struct platform_device __init *omap_device_build_ss(const char *pdev_name, |
539 | int pdev_id, | |
540 | struct omap_hwmod **ohs, | |
541 | int oh_cnt, void *pdata, | |
542 | int pdata_len) | |
b04b65ab PW |
543 | { |
544 | int ret = -ENOMEM; | |
d66b3fe4 | 545 | struct platform_device *pdev; |
b04b65ab | 546 | struct omap_device *od; |
b04b65ab PW |
547 | |
548 | if (!ohs || oh_cnt == 0 || !pdev_name) | |
549 | return ERR_PTR(-EINVAL); | |
550 | ||
551 | if (!pdata && pdata_len > 0) | |
552 | return ERR_PTR(-EINVAL); | |
553 | ||
d66b3fe4 KH |
554 | pdev = platform_device_alloc(pdev_name, pdev_id); |
555 | if (!pdev) { | |
556 | ret = -ENOMEM; | |
557 | goto odbs_exit; | |
558 | } | |
559 | ||
a4f6cdb0 BC |
560 | /* Set the dev_name early to allow dev_xxx in omap_device_alloc */ |
561 | if (pdev->id != -1) | |
562 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); | |
563 | else | |
564 | dev_set_name(&pdev->dev, "%s", pdev->name); | |
b04b65ab | 565 | |
c1d1cd59 | 566 | od = omap_device_alloc(pdev, ohs, oh_cnt); |
a87e6628 | 567 | if (IS_ERR(od)) |
d66b3fe4 | 568 | goto odbs_exit1; |
d66b3fe4 KH |
569 | |
570 | ret = platform_device_add_data(pdev, pdata, pdata_len); | |
49b368a6 | 571 | if (ret) |
a4f6cdb0 | 572 | goto odbs_exit2; |
b04b65ab | 573 | |
c1d1cd59 | 574 | ret = omap_device_register(pdev); |
d66b3fe4 | 575 | if (ret) |
a4f6cdb0 | 576 | goto odbs_exit2; |
06563581 | 577 | |
d66b3fe4 | 578 | return pdev; |
b04b65ab | 579 | |
d66b3fe4 | 580 | odbs_exit2: |
a4f6cdb0 | 581 | omap_device_delete(od); |
d66b3fe4 KH |
582 | odbs_exit1: |
583 | platform_device_put(pdev); | |
584 | odbs_exit: | |
b04b65ab PW |
585 | |
586 | pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret); | |
587 | ||
588 | return ERR_PTR(ret); | |
589 | } | |
590 | ||
256a5435 | 591 | #ifdef CONFIG_PM_RUNTIME |
638080c3 KH |
592 | static int _od_runtime_suspend(struct device *dev) |
593 | { | |
594 | struct platform_device *pdev = to_platform_device(dev); | |
345f79b3 | 595 | int ret; |
638080c3 | 596 | |
345f79b3 KH |
597 | ret = pm_generic_runtime_suspend(dev); |
598 | ||
599 | if (!ret) | |
600 | omap_device_idle(pdev); | |
601 | ||
602 | return ret; | |
603 | } | |
604 | ||
638080c3 KH |
605 | static int _od_runtime_resume(struct device *dev) |
606 | { | |
607 | struct platform_device *pdev = to_platform_device(dev); | |
608 | ||
345f79b3 KH |
609 | omap_device_enable(pdev); |
610 | ||
611 | return pm_generic_runtime_resume(dev); | |
638080c3 | 612 | } |
f5c33b07 NM |
613 | |
614 | static int _od_fail_runtime_suspend(struct device *dev) | |
615 | { | |
616 | dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__); | |
617 | return -ENODEV; | |
618 | } | |
619 | ||
620 | static int _od_fail_runtime_resume(struct device *dev) | |
621 | { | |
622 | dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__); | |
623 | return -ENODEV; | |
624 | } | |
625 | ||
256a5435 | 626 | #endif |
638080c3 | 627 | |
c03f007a KH |
628 | #ifdef CONFIG_SUSPEND |
629 | static int _od_suspend_noirq(struct device *dev) | |
630 | { | |
631 | struct platform_device *pdev = to_platform_device(dev); | |
632 | struct omap_device *od = to_omap_device(pdev); | |
633 | int ret; | |
634 | ||
72bb6f9b KH |
635 | /* Don't attempt late suspend on a driver that is not bound */ |
636 | if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) | |
637 | return 0; | |
638 | ||
c03f007a KH |
639 | ret = pm_generic_suspend_noirq(dev); |
640 | ||
641 | if (!ret && !pm_runtime_status_suspended(dev)) { | |
642 | if (pm_generic_runtime_suspend(dev) == 0) { | |
3522bf7b | 643 | pm_runtime_set_suspended(dev); |
4b7ec5ac | 644 | omap_device_idle(pdev); |
c03f007a KH |
645 | od->flags |= OMAP_DEVICE_SUSPENDED; |
646 | } | |
647 | } | |
648 | ||
649 | return ret; | |
650 | } | |
651 | ||
652 | static int _od_resume_noirq(struct device *dev) | |
653 | { | |
654 | struct platform_device *pdev = to_platform_device(dev); | |
655 | struct omap_device *od = to_omap_device(pdev); | |
656 | ||
3522bf7b | 657 | if (od->flags & OMAP_DEVICE_SUSPENDED) { |
c03f007a | 658 | od->flags &= ~OMAP_DEVICE_SUSPENDED; |
4b7ec5ac | 659 | omap_device_enable(pdev); |
3522bf7b NM |
660 | /* |
661 | * XXX: we run before core runtime pm has resumed itself. At | |
662 | * this point in time, we just restore the runtime pm state and | |
663 | * considering symmetric operations in resume, we donot expect | |
664 | * to fail. If we failed, something changed in core runtime_pm | |
665 | * framework OR some device driver messed things up, hence, WARN | |
666 | */ | |
667 | WARN(pm_runtime_set_active(dev), | |
668 | "Could not set %s runtime state active\n", dev_name(dev)); | |
c03f007a KH |
669 | pm_generic_runtime_resume(dev); |
670 | } | |
671 | ||
672 | return pm_generic_resume_noirq(dev); | |
673 | } | |
126caf13 KH |
674 | #else |
675 | #define _od_suspend_noirq NULL | |
676 | #define _od_resume_noirq NULL | |
c03f007a KH |
677 | #endif |
678 | ||
f5c33b07 NM |
679 | struct dev_pm_domain omap_device_fail_pm_domain = { |
680 | .ops = { | |
681 | SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend, | |
682 | _od_fail_runtime_resume, NULL) | |
683 | } | |
684 | }; | |
685 | ||
3ec2decb | 686 | struct dev_pm_domain omap_device_pm_domain = { |
638080c3 | 687 | .ops = { |
256a5435 | 688 | SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume, |
45f0a85c | 689 | NULL) |
638080c3 | 690 | USE_PLATFORM_PM_SLEEP_OPS |
ff35336d KH |
691 | .suspend_noirq = _od_suspend_noirq, |
692 | .resume_noirq = _od_resume_noirq, | |
638080c3 KH |
693 | } |
694 | }; | |
695 | ||
b04b65ab PW |
696 | /** |
697 | * omap_device_register - register an omap_device with one omap_hwmod | |
698 | * @od: struct omap_device * to register | |
699 | * | |
700 | * Register the omap_device structure. This currently just calls | |
701 | * platform_device_register() on the underlying platform_device. | |
702 | * Returns the return value of platform_device_register(). | |
703 | */ | |
993e4fbd | 704 | int omap_device_register(struct platform_device *pdev) |
b04b65ab | 705 | { |
bfae4f8f | 706 | pr_debug("omap_device: %s: registering\n", pdev->name); |
b04b65ab | 707 | |
bfae4f8f | 708 | pdev->dev.pm_domain = &omap_device_pm_domain; |
d66b3fe4 | 709 | return platform_device_add(pdev); |
b04b65ab PW |
710 | } |
711 | ||
712 | ||
713 | /* Public functions for use by device drivers through struct platform_data */ | |
714 | ||
715 | /** | |
716 | * omap_device_enable - fully activate an omap_device | |
717 | * @od: struct omap_device * to activate | |
718 | * | |
719 | * Do whatever is necessary for the hwmods underlying omap_device @od | |
720 | * to be accessible and ready to operate. This generally involves | |
721 | * enabling clocks, setting SYSCONFIG registers; and in the future may | |
722 | * involve remuxing pins. Device drivers should call this function | |
c1d1cd59 PW |
723 | * indirectly via pm_runtime_get*(). Returns -EINVAL if called when |
724 | * the omap_device is already enabled, or passes along the return | |
725 | * value of _omap_device_enable_hwmods(). | |
b04b65ab PW |
726 | */ |
727 | int omap_device_enable(struct platform_device *pdev) | |
728 | { | |
729 | int ret; | |
730 | struct omap_device *od; | |
731 | ||
8f0d69de | 732 | od = to_omap_device(pdev); |
b04b65ab PW |
733 | |
734 | if (od->_state == OMAP_DEVICE_STATE_ENABLED) { | |
49882c99 KH |
735 | dev_warn(&pdev->dev, |
736 | "omap_device: %s() called from invalid state %d\n", | |
737 | __func__, od->_state); | |
b04b65ab PW |
738 | return -EINVAL; |
739 | } | |
740 | ||
c1d1cd59 | 741 | ret = _omap_device_enable_hwmods(od); |
b04b65ab | 742 | |
b04b65ab PW |
743 | od->_state = OMAP_DEVICE_STATE_ENABLED; |
744 | ||
745 | return ret; | |
746 | } | |
747 | ||
748 | /** | |
749 | * omap_device_idle - idle an omap_device | |
750 | * @od: struct omap_device * to idle | |
751 | * | |
c1d1cd59 PW |
752 | * Idle omap_device @od. Device drivers call this function indirectly |
753 | * via pm_runtime_put*(). Returns -EINVAL if the omap_device is not | |
b04b65ab | 754 | * currently enabled, or passes along the return value of |
c1d1cd59 | 755 | * _omap_device_idle_hwmods(). |
b04b65ab PW |
756 | */ |
757 | int omap_device_idle(struct platform_device *pdev) | |
758 | { | |
759 | int ret; | |
760 | struct omap_device *od; | |
761 | ||
8f0d69de | 762 | od = to_omap_device(pdev); |
b04b65ab PW |
763 | |
764 | if (od->_state != OMAP_DEVICE_STATE_ENABLED) { | |
49882c99 KH |
765 | dev_warn(&pdev->dev, |
766 | "omap_device: %s() called from invalid state %d\n", | |
767 | __func__, od->_state); | |
b04b65ab PW |
768 | return -EINVAL; |
769 | } | |
770 | ||
c1d1cd59 | 771 | ret = _omap_device_idle_hwmods(od); |
b04b65ab PW |
772 | |
773 | od->_state = OMAP_DEVICE_STATE_IDLE; | |
774 | ||
775 | return ret; | |
776 | } | |
777 | ||
8bb9fde2 ORL |
778 | /** |
779 | * omap_device_assert_hardreset - set a device's hardreset line | |
780 | * @pdev: struct platform_device * to reset | |
781 | * @name: const char * name of the reset line | |
782 | * | |
783 | * Set the hardreset line identified by @name on the IP blocks | |
784 | * associated with the hwmods backing the platform_device @pdev. All | |
785 | * of the hwmods associated with @pdev must have the same hardreset | |
786 | * line linked to them for this to work. Passes along the return value | |
787 | * of omap_hwmod_assert_hardreset() in the event of any failure, or | |
788 | * returns 0 upon success. | |
789 | */ | |
790 | int omap_device_assert_hardreset(struct platform_device *pdev, const char *name) | |
791 | { | |
792 | struct omap_device *od = to_omap_device(pdev); | |
793 | int ret = 0; | |
794 | int i; | |
795 | ||
796 | for (i = 0; i < od->hwmods_cnt; i++) { | |
797 | ret = omap_hwmod_assert_hardreset(od->hwmods[i], name); | |
798 | if (ret) | |
799 | break; | |
800 | } | |
801 | ||
802 | return ret; | |
803 | } | |
804 | ||
805 | /** | |
806 | * omap_device_deassert_hardreset - release a device's hardreset line | |
807 | * @pdev: struct platform_device * to reset | |
808 | * @name: const char * name of the reset line | |
809 | * | |
810 | * Release the hardreset line identified by @name on the IP blocks | |
811 | * associated with the hwmods backing the platform_device @pdev. All | |
812 | * of the hwmods associated with @pdev must have the same hardreset | |
813 | * line linked to them for this to work. Passes along the return | |
814 | * value of omap_hwmod_deassert_hardreset() in the event of any | |
815 | * failure, or returns 0 upon success. | |
816 | */ | |
817 | int omap_device_deassert_hardreset(struct platform_device *pdev, | |
818 | const char *name) | |
819 | { | |
820 | struct omap_device *od = to_omap_device(pdev); | |
821 | int ret = 0; | |
822 | int i; | |
823 | ||
824 | for (i = 0; i < od->hwmods_cnt; i++) { | |
825 | ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name); | |
826 | if (ret) | |
827 | break; | |
828 | } | |
829 | ||
830 | return ret; | |
831 | } | |
832 | ||
1f8a7d52 NM |
833 | /** |
834 | * omap_device_get_by_hwmod_name() - convert a hwmod name to | |
835 | * device pointer. | |
836 | * @oh_name: name of the hwmod device | |
837 | * | |
838 | * Returns back a struct device * pointer associated with a hwmod | |
839 | * device represented by a hwmod_name | |
840 | */ | |
841 | struct device *omap_device_get_by_hwmod_name(const char *oh_name) | |
842 | { | |
843 | struct omap_hwmod *oh; | |
844 | ||
845 | if (!oh_name) { | |
846 | WARN(1, "%s: no hwmod name!\n", __func__); | |
847 | return ERR_PTR(-EINVAL); | |
848 | } | |
849 | ||
850 | oh = omap_hwmod_lookup(oh_name); | |
857835c6 | 851 | if (!oh) { |
1f8a7d52 NM |
852 | WARN(1, "%s: no hwmod for %s\n", __func__, |
853 | oh_name); | |
857835c6 | 854 | return ERR_PTR(-ENODEV); |
1f8a7d52 | 855 | } |
857835c6 | 856 | if (!oh->od) { |
1f8a7d52 NM |
857 | WARN(1, "%s: no omap_device for %s\n", __func__, |
858 | oh_name); | |
857835c6 | 859 | return ERR_PTR(-ENODEV); |
1f8a7d52 NM |
860 | } |
861 | ||
1f8a7d52 NM |
862 | return &oh->od->pdev->dev; |
863 | } | |
0d5e8252 | 864 | |
dc2d07eb BC |
865 | static struct notifier_block platform_nb = { |
866 | .notifier_call = _omap_device_notifier_call, | |
867 | }; | |
868 | ||
0d5e8252 KH |
869 | static int __init omap_device_init(void) |
870 | { | |
dc2d07eb | 871 | bus_register_notifier(&platform_bus_type, &platform_nb); |
3ec2decb | 872 | return 0; |
0d5e8252 | 873 | } |
b76c8b19 | 874 | omap_core_initcall(omap_device_init); |
9634c8dd KH |
875 | |
876 | /** | |
877 | * omap_device_late_idle - idle devices without drivers | |
878 | * @dev: struct device * associated with omap_device | |
879 | * @data: unused | |
880 | * | |
881 | * Check the driver bound status of this device, and idle it | |
882 | * if there is no driver attached. | |
883 | */ | |
884 | static int __init omap_device_late_idle(struct device *dev, void *data) | |
885 | { | |
886 | struct platform_device *pdev = to_platform_device(dev); | |
887 | struct omap_device *od = to_omap_device(pdev); | |
f66e329d | 888 | int i; |
9634c8dd KH |
889 | |
890 | if (!od) | |
891 | return 0; | |
892 | ||
893 | /* | |
894 | * If omap_device state is enabled, but has no driver bound, | |
895 | * idle it. | |
896 | */ | |
f66e329d RN |
897 | |
898 | /* | |
899 | * Some devices (like memory controllers) are always kept | |
900 | * enabled, and should not be idled even with no drivers. | |
901 | */ | |
902 | for (i = 0; i < od->hwmods_cnt; i++) | |
903 | if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE) | |
904 | return 0; | |
905 | ||
9634c8dd KH |
906 | if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) { |
907 | if (od->_state == OMAP_DEVICE_STATE_ENABLED) { | |
908 | dev_warn(dev, "%s: enabled but no driver. Idling\n", | |
909 | __func__); | |
910 | omap_device_idle(pdev); | |
911 | } | |
912 | } | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | static int __init omap_device_late_init(void) | |
918 | { | |
919 | bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle); | |
4b91f7f3 TL |
920 | |
921 | WARN(!of_have_populated_dt(), | |
922 | "legacy booting deprecated, please update to boot with .dts\n"); | |
923 | ||
9634c8dd KH |
924 | return 0; |
925 | } | |
e7e17c53 | 926 | omap_late_initcall_sync(omap_device_late_init); |