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f2f2726b GR |
1 | /* |
2 | * Freescale data path resource container (DPRC) driver | |
3 | * | |
4 | * Copyright (C) 2014 Freescale Semiconductor, Inc. | |
5 | * Author: German Rivera <German.Rivera@freescale.com> | |
6 | * | |
7 | * This file is licensed under the terms of the GNU General Public | |
8 | * License version 2. This program is licensed "as is" without any | |
9 | * warranty of any kind, whether express or implied. | |
10 | */ | |
11 | ||
f2f2726b GR |
12 | #include <linux/module.h> |
13 | #include <linux/slab.h> | |
232ae8f2 | 14 | #include <linux/interrupt.h> |
f52dee5c | 15 | #include <linux/msi.h> |
d4e75132 SY |
16 | #include "../include/mc-bus.h" |
17 | #include "../include/mc-sys.h" | |
18 | ||
f2f2726b | 19 | #include "dprc-cmd.h" |
243444fb | 20 | #include "fsl-mc-private.h" |
f2f2726b | 21 | |
2b0011d2 SY |
22 | #define FSL_MC_DPRC_DRIVER_NAME "fsl_mc_dprc" |
23 | ||
24 | #define FSL_MC_DEVICE_MATCH(_mc_dev, _obj_desc) \ | |
25 | (strcmp((_mc_dev)->obj_desc.type, (_obj_desc)->type) == 0 && \ | |
26 | (_mc_dev)->obj_desc.id == (_obj_desc)->id) | |
27 | ||
f2f2726b GR |
28 | struct dprc_child_objs { |
29 | int child_count; | |
30 | struct dprc_obj_desc *child_array; | |
31 | }; | |
32 | ||
33 | static int __fsl_mc_device_remove_if_not_in_mc(struct device *dev, void *data) | |
34 | { | |
35 | int i; | |
36 | struct dprc_child_objs *objs; | |
37 | struct fsl_mc_device *mc_dev; | |
38 | ||
39 | WARN_ON(!dev); | |
40 | WARN_ON(!data); | |
41 | mc_dev = to_fsl_mc_device(dev); | |
42 | objs = data; | |
43 | ||
44 | for (i = 0; i < objs->child_count; i++) { | |
45 | struct dprc_obj_desc *obj_desc = &objs->child_array[i]; | |
46 | ||
47 | if (strlen(obj_desc->type) != 0 && | |
48 | FSL_MC_DEVICE_MATCH(mc_dev, obj_desc)) | |
49 | break; | |
50 | } | |
51 | ||
52 | if (i == objs->child_count) | |
53 | fsl_mc_device_remove(mc_dev); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | static int __fsl_mc_device_remove(struct device *dev, void *data) | |
59 | { | |
60 | WARN_ON(!dev); | |
61 | WARN_ON(data); | |
62 | fsl_mc_device_remove(to_fsl_mc_device(dev)); | |
63 | return 0; | |
64 | } | |
65 | ||
66 | /** | |
67 | * dprc_remove_devices - Removes devices for objects removed from a DPRC | |
68 | * | |
69 | * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object | |
70 | * @obj_desc_array: array of object descriptors for child objects currently | |
71 | * present in the DPRC in the MC. | |
72 | * @num_child_objects_in_mc: number of entries in obj_desc_array | |
73 | * | |
74 | * Synchronizes the state of the Linux bus driver with the actual state of | |
75 | * the MC by removing devices that represent MC objects that have | |
76 | * been dynamically removed in the physical DPRC. | |
77 | */ | |
78 | static void dprc_remove_devices(struct fsl_mc_device *mc_bus_dev, | |
79 | struct dprc_obj_desc *obj_desc_array, | |
80 | int num_child_objects_in_mc) | |
81 | { | |
82 | if (num_child_objects_in_mc != 0) { | |
83 | /* | |
84 | * Remove child objects that are in the DPRC in Linux, | |
85 | * but not in the MC: | |
86 | */ | |
87 | struct dprc_child_objs objs; | |
88 | ||
89 | objs.child_count = num_child_objects_in_mc; | |
90 | objs.child_array = obj_desc_array; | |
91 | device_for_each_child(&mc_bus_dev->dev, &objs, | |
92 | __fsl_mc_device_remove_if_not_in_mc); | |
93 | } else { | |
94 | /* | |
95 | * There are no child objects for this DPRC in the MC. | |
96 | * So, remove all the child devices from Linux: | |
97 | */ | |
98 | device_for_each_child(&mc_bus_dev->dev, NULL, | |
99 | __fsl_mc_device_remove); | |
100 | } | |
101 | } | |
102 | ||
103 | static int __fsl_mc_device_match(struct device *dev, void *data) | |
104 | { | |
105 | struct dprc_obj_desc *obj_desc = data; | |
106 | struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev); | |
107 | ||
108 | return FSL_MC_DEVICE_MATCH(mc_dev, obj_desc); | |
109 | } | |
110 | ||
111 | static struct fsl_mc_device *fsl_mc_device_lookup(struct dprc_obj_desc | |
112 | *obj_desc, | |
113 | struct fsl_mc_device | |
114 | *mc_bus_dev) | |
115 | { | |
116 | struct device *dev; | |
117 | ||
118 | dev = device_find_child(&mc_bus_dev->dev, obj_desc, | |
119 | __fsl_mc_device_match); | |
120 | ||
121 | return dev ? to_fsl_mc_device(dev) : NULL; | |
122 | } | |
123 | ||
1663e809 GR |
124 | /** |
125 | * check_plugged_state_change - Check change in an MC object's plugged state | |
126 | * | |
127 | * @mc_dev: pointer to the fsl-mc device for a given MC object | |
128 | * @obj_desc: pointer to the MC object's descriptor in the MC | |
129 | * | |
130 | * If the plugged state has changed from unplugged to plugged, the fsl-mc | |
131 | * device is bound to the corresponding device driver. | |
132 | * If the plugged state has changed from plugged to unplugged, the fsl-mc | |
133 | * device is unbound from the corresponding device driver. | |
134 | */ | |
135 | static void check_plugged_state_change(struct fsl_mc_device *mc_dev, | |
136 | struct dprc_obj_desc *obj_desc) | |
137 | { | |
138 | int error; | |
ba72f25b | 139 | u32 plugged_flag_at_mc = |
2cdb82c7 | 140 | obj_desc->state & DPRC_OBJ_STATE_PLUGGED; |
1663e809 GR |
141 | |
142 | if (plugged_flag_at_mc != | |
143 | (mc_dev->obj_desc.state & DPRC_OBJ_STATE_PLUGGED)) { | |
144 | if (plugged_flag_at_mc) { | |
145 | mc_dev->obj_desc.state |= DPRC_OBJ_STATE_PLUGGED; | |
146 | error = device_attach(&mc_dev->dev); | |
147 | if (error < 0) { | |
148 | dev_err(&mc_dev->dev, | |
149 | "device_attach() failed: %d\n", | |
150 | error); | |
151 | } | |
152 | } else { | |
153 | mc_dev->obj_desc.state &= ~DPRC_OBJ_STATE_PLUGGED; | |
154 | device_release_driver(&mc_dev->dev); | |
155 | } | |
156 | } | |
157 | } | |
158 | ||
f2f2726b GR |
159 | /** |
160 | * dprc_add_new_devices - Adds devices to the logical bus for a DPRC | |
161 | * | |
162 | * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object | |
163 | * @obj_desc_array: array of device descriptors for child devices currently | |
164 | * present in the physical DPRC. | |
165 | * @num_child_objects_in_mc: number of entries in obj_desc_array | |
166 | * | |
167 | * Synchronizes the state of the Linux bus driver with the actual | |
168 | * state of the MC by adding objects that have been newly discovered | |
169 | * in the physical DPRC. | |
170 | */ | |
171 | static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev, | |
172 | struct dprc_obj_desc *obj_desc_array, | |
173 | int num_child_objects_in_mc) | |
174 | { | |
175 | int error; | |
176 | int i; | |
177 | ||
178 | for (i = 0; i < num_child_objects_in_mc; i++) { | |
179 | struct fsl_mc_device *child_dev; | |
f2f2726b GR |
180 | struct dprc_obj_desc *obj_desc = &obj_desc_array[i]; |
181 | ||
182 | if (strlen(obj_desc->type) == 0) | |
183 | continue; | |
184 | ||
185 | /* | |
186 | * Check if device is already known to Linux: | |
187 | */ | |
188 | child_dev = fsl_mc_device_lookup(obj_desc, mc_bus_dev); | |
1663e809 GR |
189 | if (child_dev) { |
190 | check_plugged_state_change(child_dev, obj_desc); | |
f2f2726b | 191 | continue; |
1663e809 | 192 | } |
f2f2726b | 193 | |
2bdc55d9 | 194 | error = fsl_mc_device_add(obj_desc, NULL, &mc_bus_dev->dev, |
f2f2726b | 195 | &child_dev); |
2bdc55d9 | 196 | if (error < 0) |
f2f2726b | 197 | continue; |
f2f2726b GR |
198 | } |
199 | } | |
200 | ||
201 | /** | |
202 | * dprc_scan_objects - Discover objects in a DPRC | |
203 | * | |
204 | * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object | |
1e4aa42a | 205 | * @total_irq_count: total number of IRQs needed by objects in the DPRC. |
f2f2726b GR |
206 | * |
207 | * Detects objects added and removed from a DPRC and synchronizes the | |
208 | * state of the Linux bus driver, MC by adding and removing | |
209 | * devices accordingly. | |
197f4d6a GR |
210 | * Two types of devices can be found in a DPRC: allocatable objects (e.g., |
211 | * dpbp, dpmcp) and non-allocatable devices (e.g., dprc, dpni). | |
212 | * All allocatable devices needed to be probed before all non-allocatable | |
213 | * devices, to ensure that device drivers for non-allocatable | |
214 | * devices can allocate any type of allocatable devices. | |
215 | * That is, we need to ensure that the corresponding resource pools are | |
216 | * populated before they can get allocation requests from probe callbacks | |
217 | * of the device drivers for the non-allocatable devices. | |
f2f2726b | 218 | */ |
1e4aa42a GR |
219 | int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev, |
220 | unsigned int *total_irq_count) | |
f2f2726b GR |
221 | { |
222 | int num_child_objects; | |
223 | int dprc_get_obj_failures; | |
224 | int error; | |
1e4aa42a | 225 | unsigned int irq_count = mc_bus_dev->obj_desc.irq_count; |
f2f2726b GR |
226 | struct dprc_obj_desc *child_obj_desc_array = NULL; |
227 | ||
228 | error = dprc_get_obj_count(mc_bus_dev->mc_io, | |
1ee695fa | 229 | 0, |
f2f2726b GR |
230 | mc_bus_dev->mc_handle, |
231 | &num_child_objects); | |
232 | if (error < 0) { | |
233 | dev_err(&mc_bus_dev->dev, "dprc_get_obj_count() failed: %d\n", | |
234 | error); | |
235 | return error; | |
236 | } | |
237 | ||
238 | if (num_child_objects != 0) { | |
239 | int i; | |
240 | ||
241 | child_obj_desc_array = | |
242 | devm_kmalloc_array(&mc_bus_dev->dev, num_child_objects, | |
243 | sizeof(*child_obj_desc_array), | |
244 | GFP_KERNEL); | |
245 | if (!child_obj_desc_array) | |
246 | return -ENOMEM; | |
247 | ||
248 | /* | |
249 | * Discover objects currently present in the physical DPRC: | |
250 | */ | |
251 | dprc_get_obj_failures = 0; | |
252 | for (i = 0; i < num_child_objects; i++) { | |
253 | struct dprc_obj_desc *obj_desc = | |
254 | &child_obj_desc_array[i]; | |
255 | ||
256 | error = dprc_get_obj(mc_bus_dev->mc_io, | |
1ee695fa | 257 | 0, |
f2f2726b GR |
258 | mc_bus_dev->mc_handle, |
259 | i, obj_desc); | |
260 | if (error < 0) { | |
261 | dev_err(&mc_bus_dev->dev, | |
262 | "dprc_get_obj(i=%d) failed: %d\n", | |
263 | i, error); | |
264 | /* | |
265 | * Mark the obj entry as "invalid", by using the | |
266 | * empty string as obj type: | |
267 | */ | |
268 | obj_desc->type[0] = '\0'; | |
269 | obj_desc->id = error; | |
270 | dprc_get_obj_failures++; | |
271 | continue; | |
272 | } | |
273 | ||
ae014c23 HG |
274 | /* |
275 | * add a quirk for all versions of dpsec < 4.0...none | |
276 | * are coherent regardless of what the MC reports. | |
277 | */ | |
278 | if ((strcmp(obj_desc->type, "dpseci") == 0) && | |
279 | (obj_desc->ver_major < 4)) | |
280 | obj_desc->flags |= | |
281 | DPRC_OBJ_FLAG_NO_MEM_SHAREABILITY; | |
282 | ||
1e4aa42a | 283 | irq_count += obj_desc->irq_count; |
f2f2726b GR |
284 | dev_dbg(&mc_bus_dev->dev, |
285 | "Discovered object: type %s, id %d\n", | |
286 | obj_desc->type, obj_desc->id); | |
287 | } | |
288 | ||
289 | if (dprc_get_obj_failures != 0) { | |
290 | dev_err(&mc_bus_dev->dev, | |
291 | "%d out of %d devices could not be retrieved\n", | |
292 | dprc_get_obj_failures, num_child_objects); | |
293 | } | |
294 | } | |
295 | ||
1e4aa42a | 296 | *total_irq_count = irq_count; |
f2f2726b GR |
297 | dprc_remove_devices(mc_bus_dev, child_obj_desc_array, |
298 | num_child_objects); | |
299 | ||
300 | dprc_add_new_devices(mc_bus_dev, child_obj_desc_array, | |
301 | num_child_objects); | |
302 | ||
303 | if (child_obj_desc_array) | |
304 | devm_kfree(&mc_bus_dev->dev, child_obj_desc_array); | |
305 | ||
306 | return 0; | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(dprc_scan_objects); | |
309 | ||
310 | /** | |
311 | * dprc_scan_container - Scans a physical DPRC and synchronizes Linux bus state | |
312 | * | |
313 | * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object | |
314 | * | |
315 | * Scans the physical DPRC and synchronizes the state of the Linux | |
316 | * bus driver with the actual state of the MC by adding and removing | |
317 | * devices as appropriate. | |
318 | */ | |
319 | int dprc_scan_container(struct fsl_mc_device *mc_bus_dev) | |
320 | { | |
321 | int error; | |
1e4aa42a | 322 | unsigned int irq_count; |
f2f2726b GR |
323 | struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev); |
324 | ||
36406955 | 325 | fsl_mc_init_all_resource_pools(mc_bus_dev); |
197f4d6a | 326 | |
f2f2726b GR |
327 | /* |
328 | * Discover objects in the DPRC: | |
329 | */ | |
330 | mutex_lock(&mc_bus->scan_mutex); | |
1e4aa42a | 331 | error = dprc_scan_objects(mc_bus_dev, &irq_count); |
f2f2726b | 332 | mutex_unlock(&mc_bus->scan_mutex); |
197f4d6a GR |
333 | if (error < 0) |
334 | goto error; | |
335 | ||
1e4aa42a GR |
336 | if (dev_get_msi_domain(&mc_bus_dev->dev) && !mc_bus->irq_resources) { |
337 | if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) { | |
338 | dev_warn(&mc_bus_dev->dev, | |
339 | "IRQs needed (%u) exceed IRQs preallocated (%u)\n", | |
340 | irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS); | |
341 | } | |
342 | ||
343 | error = fsl_mc_populate_irq_pool( | |
344 | mc_bus, | |
345 | FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS); | |
346 | if (error < 0) | |
347 | goto error; | |
348 | } | |
349 | ||
197f4d6a GR |
350 | return 0; |
351 | error: | |
36406955 | 352 | fsl_mc_cleanup_all_resource_pools(mc_bus_dev); |
f2f2726b GR |
353 | return error; |
354 | } | |
355 | EXPORT_SYMBOL_GPL(dprc_scan_container); | |
356 | ||
f52dee5c GR |
357 | /** |
358 | * dprc_irq0_handler - Regular ISR for DPRC interrupt 0 | |
359 | * | |
360 | * @irq: IRQ number of the interrupt being handled | |
361 | * @arg: Pointer to device structure | |
362 | */ | |
363 | static irqreturn_t dprc_irq0_handler(int irq_num, void *arg) | |
364 | { | |
365 | return IRQ_WAKE_THREAD; | |
366 | } | |
367 | ||
368 | /** | |
369 | * dprc_irq0_handler_thread - Handler thread function for DPRC interrupt 0 | |
370 | * | |
371 | * @irq: IRQ number of the interrupt being handled | |
372 | * @arg: Pointer to device structure | |
373 | */ | |
374 | static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg) | |
375 | { | |
376 | int error; | |
377 | u32 status; | |
36b64670 | 378 | struct device *dev = arg; |
f52dee5c GR |
379 | struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev); |
380 | struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); | |
381 | struct fsl_mc_io *mc_io = mc_dev->mc_io; | |
382 | struct msi_desc *msi_desc = mc_dev->irqs[0]->msi_desc; | |
383 | ||
384 | dev_dbg(dev, "DPRC IRQ %d triggered on CPU %u\n", | |
385 | irq_num, smp_processor_id()); | |
386 | ||
387 | if (WARN_ON(!(mc_dev->flags & FSL_MC_IS_DPRC))) | |
388 | return IRQ_HANDLED; | |
389 | ||
390 | mutex_lock(&mc_bus->scan_mutex); | |
391 | if (WARN_ON(!msi_desc || msi_desc->irq != (u32)irq_num)) | |
392 | goto out; | |
393 | ||
ac061998 | 394 | status = 0; |
f52dee5c GR |
395 | error = dprc_get_irq_status(mc_io, 0, mc_dev->mc_handle, 0, |
396 | &status); | |
397 | if (error < 0) { | |
398 | dev_err(dev, | |
399 | "dprc_get_irq_status() failed: %d\n", error); | |
400 | goto out; | |
401 | } | |
402 | ||
403 | error = dprc_clear_irq_status(mc_io, 0, mc_dev->mc_handle, 0, | |
404 | status); | |
405 | if (error < 0) { | |
406 | dev_err(dev, | |
407 | "dprc_clear_irq_status() failed: %d\n", error); | |
408 | goto out; | |
409 | } | |
410 | ||
411 | if (status & (DPRC_IRQ_EVENT_OBJ_ADDED | | |
412 | DPRC_IRQ_EVENT_OBJ_REMOVED | | |
413 | DPRC_IRQ_EVENT_CONTAINER_DESTROYED | | |
414 | DPRC_IRQ_EVENT_OBJ_DESTROYED | | |
415 | DPRC_IRQ_EVENT_OBJ_CREATED)) { | |
416 | unsigned int irq_count; | |
417 | ||
418 | error = dprc_scan_objects(mc_dev, &irq_count); | |
419 | if (error < 0) { | |
420 | /* | |
421 | * If the error is -ENXIO, we ignore it, as it indicates | |
422 | * that the object scan was aborted, as we detected that | |
423 | * an object was removed from the DPRC in the MC, while | |
424 | * we were scanning the DPRC. | |
425 | */ | |
426 | if (error != -ENXIO) { | |
427 | dev_err(dev, "dprc_scan_objects() failed: %d\n", | |
428 | error); | |
429 | } | |
430 | ||
431 | goto out; | |
432 | } | |
433 | ||
434 | if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) { | |
435 | dev_warn(dev, | |
436 | "IRQs needed (%u) exceed IRQs preallocated (%u)\n", | |
437 | irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS); | |
438 | } | |
439 | } | |
440 | ||
441 | out: | |
442 | mutex_unlock(&mc_bus->scan_mutex); | |
443 | return IRQ_HANDLED; | |
444 | } | |
445 | ||
446 | /* | |
447 | * Disable and clear interrupt for a given DPRC object | |
448 | */ | |
449 | static int disable_dprc_irq(struct fsl_mc_device *mc_dev) | |
450 | { | |
451 | int error; | |
452 | struct fsl_mc_io *mc_io = mc_dev->mc_io; | |
453 | ||
454 | WARN_ON(mc_dev->obj_desc.irq_count != 1); | |
455 | ||
456 | /* | |
457 | * Disable generation of interrupt, while we configure it: | |
458 | */ | |
459 | error = dprc_set_irq_enable(mc_io, 0, mc_dev->mc_handle, 0, 0); | |
460 | if (error < 0) { | |
461 | dev_err(&mc_dev->dev, | |
462 | "Disabling DPRC IRQ failed: dprc_set_irq_enable() failed: %d\n", | |
463 | error); | |
464 | return error; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Disable all interrupt causes for the interrupt: | |
469 | */ | |
470 | error = dprc_set_irq_mask(mc_io, 0, mc_dev->mc_handle, 0, 0x0); | |
471 | if (error < 0) { | |
472 | dev_err(&mc_dev->dev, | |
473 | "Disabling DPRC IRQ failed: dprc_set_irq_mask() failed: %d\n", | |
474 | error); | |
475 | return error; | |
476 | } | |
477 | ||
478 | /* | |
479 | * Clear any leftover interrupts: | |
480 | */ | |
481 | error = dprc_clear_irq_status(mc_io, 0, mc_dev->mc_handle, 0, ~0x0U); | |
482 | if (error < 0) { | |
483 | dev_err(&mc_dev->dev, | |
484 | "Disabling DPRC IRQ failed: dprc_clear_irq_status() failed: %d\n", | |
485 | error); | |
486 | return error; | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev) | |
493 | { | |
494 | int error; | |
495 | struct fsl_mc_device_irq *irq = mc_dev->irqs[0]; | |
496 | ||
497 | WARN_ON(mc_dev->obj_desc.irq_count != 1); | |
498 | ||
499 | /* | |
500 | * NOTE: devm_request_threaded_irq() invokes the device-specific | |
501 | * function that programs the MSI physically in the device | |
502 | */ | |
503 | error = devm_request_threaded_irq(&mc_dev->dev, | |
504 | irq->msi_desc->irq, | |
505 | dprc_irq0_handler, | |
506 | dprc_irq0_handler_thread, | |
507 | IRQF_NO_SUSPEND | IRQF_ONESHOT, | |
508 | "FSL MC DPRC irq0", | |
509 | &mc_dev->dev); | |
510 | if (error < 0) { | |
511 | dev_err(&mc_dev->dev, | |
512 | "devm_request_threaded_irq() failed: %d\n", | |
513 | error); | |
514 | return error; | |
515 | } | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static int enable_dprc_irq(struct fsl_mc_device *mc_dev) | |
521 | { | |
522 | int error; | |
523 | ||
524 | /* | |
525 | * Enable all interrupt causes for the interrupt: | |
526 | */ | |
527 | error = dprc_set_irq_mask(mc_dev->mc_io, 0, mc_dev->mc_handle, 0, | |
528 | ~0x0u); | |
529 | if (error < 0) { | |
530 | dev_err(&mc_dev->dev, | |
531 | "Enabling DPRC IRQ failed: dprc_set_irq_mask() failed: %d\n", | |
532 | error); | |
533 | ||
534 | return error; | |
535 | } | |
536 | ||
537 | /* | |
538 | * Enable generation of the interrupt: | |
539 | */ | |
540 | error = dprc_set_irq_enable(mc_dev->mc_io, 0, mc_dev->mc_handle, 0, 1); | |
541 | if (error < 0) { | |
542 | dev_err(&mc_dev->dev, | |
543 | "Enabling DPRC IRQ failed: dprc_set_irq_enable() failed: %d\n", | |
544 | error); | |
545 | ||
546 | return error; | |
547 | } | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | /* | |
553 | * Setup interrupt for a given DPRC device | |
554 | */ | |
555 | static int dprc_setup_irq(struct fsl_mc_device *mc_dev) | |
556 | { | |
557 | int error; | |
558 | ||
559 | error = fsl_mc_allocate_irqs(mc_dev); | |
560 | if (error < 0) | |
561 | return error; | |
562 | ||
563 | error = disable_dprc_irq(mc_dev); | |
564 | if (error < 0) | |
565 | goto error_free_irqs; | |
566 | ||
567 | error = register_dprc_irq_handler(mc_dev); | |
568 | if (error < 0) | |
569 | goto error_free_irqs; | |
570 | ||
571 | error = enable_dprc_irq(mc_dev); | |
572 | if (error < 0) | |
573 | goto error_free_irqs; | |
574 | ||
575 | return 0; | |
576 | ||
577 | error_free_irqs: | |
578 | fsl_mc_free_irqs(mc_dev); | |
579 | return error; | |
580 | } | |
581 | ||
f2f2726b GR |
582 | /** |
583 | * dprc_probe - callback invoked when a DPRC is being bound to this driver | |
584 | * | |
585 | * @mc_dev: Pointer to fsl-mc device representing a DPRC | |
586 | * | |
587 | * It opens the physical DPRC in the MC. | |
588 | * It scans the DPRC to discover the MC objects contained in it. | |
197f4d6a GR |
589 | * It creates the interrupt pool for the MC bus associated with the DPRC. |
590 | * It configures the interrupts for the DPRC device itself. | |
f2f2726b GR |
591 | */ |
592 | static int dprc_probe(struct fsl_mc_device *mc_dev) | |
593 | { | |
594 | int error; | |
595 | size_t region_size; | |
232ae8f2 | 596 | struct device *parent_dev = mc_dev->dev.parent; |
f2f2726b | 597 | struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); |
8804f9fc | 598 | bool mc_io_created = false; |
232ae8f2 | 599 | bool msi_domain_set = false; |
f2f2726b GR |
600 | |
601 | if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0)) | |
602 | return -EINVAL; | |
603 | ||
232ae8f2 GR |
604 | if (WARN_ON(dev_get_msi_domain(&mc_dev->dev))) |
605 | return -EINVAL; | |
606 | ||
f2f2726b GR |
607 | if (!mc_dev->mc_io) { |
608 | /* | |
609 | * This is a child DPRC: | |
610 | */ | |
df5e9b5f | 611 | if (WARN_ON(!dev_is_fsl_mc(parent_dev))) |
8804f9fc GR |
612 | return -EINVAL; |
613 | ||
f2f2726b GR |
614 | if (WARN_ON(mc_dev->obj_desc.region_count == 0)) |
615 | return -EINVAL; | |
616 | ||
617 | region_size = mc_dev->regions[0].end - | |
618 | mc_dev->regions[0].start + 1; | |
619 | ||
620 | error = fsl_create_mc_io(&mc_dev->dev, | |
621 | mc_dev->regions[0].start, | |
622 | region_size, | |
1129cde5 GR |
623 | NULL, |
624 | FSL_MC_IO_ATOMIC_CONTEXT_PORTAL, | |
625 | &mc_dev->mc_io); | |
f2f2726b GR |
626 | if (error < 0) |
627 | return error; | |
8804f9fc GR |
628 | |
629 | mc_io_created = true; | |
630 | ||
232ae8f2 GR |
631 | /* |
632 | * Inherit parent MSI domain: | |
633 | */ | |
634 | dev_set_msi_domain(&mc_dev->dev, | |
635 | dev_get_msi_domain(parent_dev)); | |
636 | msi_domain_set = true; | |
637 | } else { | |
638 | /* | |
639 | * This is a root DPRC | |
640 | */ | |
641 | struct irq_domain *mc_msi_domain; | |
642 | ||
df5e9b5f | 643 | if (WARN_ON(dev_is_fsl_mc(parent_dev))) |
232ae8f2 GR |
644 | return -EINVAL; |
645 | ||
646 | error = fsl_mc_find_msi_domain(parent_dev, | |
647 | &mc_msi_domain); | |
648 | if (error < 0) { | |
649 | dev_warn(&mc_dev->dev, | |
650 | "WARNING: MC bus without interrupt support\n"); | |
651 | } else { | |
652 | dev_set_msi_domain(&mc_dev->dev, mc_msi_domain); | |
653 | msi_domain_set = true; | |
654 | } | |
f2f2726b GR |
655 | } |
656 | ||
1ee695fa | 657 | error = dprc_open(mc_dev->mc_io, 0, mc_dev->obj_desc.id, |
f2f2726b GR |
658 | &mc_dev->mc_handle); |
659 | if (error < 0) { | |
660 | dev_err(&mc_dev->dev, "dprc_open() failed: %d\n", error); | |
8804f9fc | 661 | goto error_cleanup_msi_domain; |
f2f2726b GR |
662 | } |
663 | ||
1716cb4c IK |
664 | error = dprc_get_attributes(mc_dev->mc_io, 0, mc_dev->mc_handle, |
665 | &mc_bus->dprc_attr); | |
666 | if (error < 0) { | |
667 | dev_err(&mc_dev->dev, "dprc_get_attributes() failed: %d\n", | |
668 | error); | |
669 | goto error_cleanup_open; | |
670 | } | |
671 | ||
672 | if (mc_bus->dprc_attr.version.major < DPRC_MIN_VER_MAJOR || | |
673 | (mc_bus->dprc_attr.version.major == DPRC_MIN_VER_MAJOR && | |
674 | mc_bus->dprc_attr.version.minor < DPRC_MIN_VER_MINOR)) { | |
675 | dev_err(&mc_dev->dev, | |
676 | "ERROR: DPRC version %d.%d not supported\n", | |
677 | mc_bus->dprc_attr.version.major, | |
678 | mc_bus->dprc_attr.version.minor); | |
679 | error = -ENOTSUPP; | |
680 | goto error_cleanup_open; | |
681 | } | |
682 | ||
f2f2726b GR |
683 | mutex_init(&mc_bus->scan_mutex); |
684 | ||
685 | /* | |
686 | * Discover MC objects in DPRC object: | |
687 | */ | |
688 | error = dprc_scan_container(mc_dev); | |
689 | if (error < 0) | |
690 | goto error_cleanup_open; | |
691 | ||
f52dee5c GR |
692 | /* |
693 | * Configure interrupt for the DPRC object associated with this MC bus: | |
694 | */ | |
695 | error = dprc_setup_irq(mc_dev); | |
696 | if (error < 0) | |
697 | goto error_cleanup_open; | |
698 | ||
f2f2726b GR |
699 | dev_info(&mc_dev->dev, "DPRC device bound to driver"); |
700 | return 0; | |
701 | ||
702 | error_cleanup_open: | |
1ee695fa | 703 | (void)dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle); |
f2f2726b | 704 | |
8804f9fc | 705 | error_cleanup_msi_domain: |
232ae8f2 GR |
706 | if (msi_domain_set) |
707 | dev_set_msi_domain(&mc_dev->dev, NULL); | |
708 | ||
8804f9fc GR |
709 | if (mc_io_created) { |
710 | fsl_destroy_mc_io(mc_dev->mc_io); | |
711 | mc_dev->mc_io = NULL; | |
712 | } | |
713 | ||
f2f2726b GR |
714 | return error; |
715 | } | |
716 | ||
f52dee5c GR |
717 | /* |
718 | * Tear down interrupt for a given DPRC object | |
719 | */ | |
720 | static void dprc_teardown_irq(struct fsl_mc_device *mc_dev) | |
721 | { | |
ae34934f SY |
722 | struct fsl_mc_device_irq *irq = mc_dev->irqs[0]; |
723 | ||
f52dee5c | 724 | (void)disable_dprc_irq(mc_dev); |
ae34934f SY |
725 | |
726 | devm_free_irq(&mc_dev->dev, irq->msi_desc->irq, &mc_dev->dev); | |
727 | ||
f52dee5c GR |
728 | fsl_mc_free_irqs(mc_dev); |
729 | } | |
730 | ||
f2f2726b GR |
731 | /** |
732 | * dprc_remove - callback invoked when a DPRC is being unbound from this driver | |
733 | * | |
734 | * @mc_dev: Pointer to fsl-mc device representing the DPRC | |
735 | * | |
736 | * It removes the DPRC's child objects from Linux (not from the MC) and | |
737 | * closes the DPRC device in the MC. | |
197f4d6a GR |
738 | * It tears down the interrupts that were configured for the DPRC device. |
739 | * It destroys the interrupt pool associated with this MC bus. | |
f2f2726b GR |
740 | */ |
741 | static int dprc_remove(struct fsl_mc_device *mc_dev) | |
742 | { | |
743 | int error; | |
232ae8f2 | 744 | struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); |
f2f2726b GR |
745 | |
746 | if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0)) | |
747 | return -EINVAL; | |
748 | if (WARN_ON(!mc_dev->mc_io)) | |
749 | return -EINVAL; | |
750 | ||
f52dee5c GR |
751 | if (WARN_ON(!mc_bus->irq_resources)) |
752 | return -EINVAL; | |
753 | ||
754 | if (dev_get_msi_domain(&mc_dev->dev)) | |
755 | dprc_teardown_irq(mc_dev); | |
756 | ||
f2f2726b | 757 | device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove); |
f2f2726b | 758 | |
232ae8f2 GR |
759 | if (dev_get_msi_domain(&mc_dev->dev)) { |
760 | fsl_mc_cleanup_irq_pool(mc_bus); | |
761 | dev_set_msi_domain(&mc_dev->dev, NULL); | |
762 | } | |
763 | ||
36406955 | 764 | fsl_mc_cleanup_all_resource_pools(mc_dev); |
a137fc80 SY |
765 | |
766 | error = dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle); | |
767 | if (error < 0) | |
768 | dev_err(&mc_dev->dev, "dprc_close() failed: %d\n", error); | |
769 | ||
f9362714 BB |
770 | if (!fsl_mc_is_root_dprc(&mc_dev->dev)) { |
771 | fsl_destroy_mc_io(mc_dev->mc_io); | |
772 | mc_dev->mc_io = NULL; | |
773 | } | |
774 | ||
f2f2726b GR |
775 | dev_info(&mc_dev->dev, "DPRC device unbound from driver"); |
776 | return 0; | |
777 | } | |
778 | ||
57538afb | 779 | static const struct fsl_mc_device_id match_id_table[] = { |
f2f2726b GR |
780 | { |
781 | .vendor = FSL_MC_VENDOR_FREESCALE, | |
9787d4e0 | 782 | .obj_type = "dprc"}, |
f2f2726b GR |
783 | {.vendor = 0x0}, |
784 | }; | |
785 | ||
786 | static struct fsl_mc_driver dprc_driver = { | |
787 | .driver = { | |
788 | .name = FSL_MC_DPRC_DRIVER_NAME, | |
789 | .owner = THIS_MODULE, | |
790 | .pm = NULL, | |
791 | }, | |
792 | .match_id_table = match_id_table, | |
793 | .probe = dprc_probe, | |
794 | .remove = dprc_remove, | |
795 | }; | |
796 | ||
797 | int __init dprc_driver_init(void) | |
798 | { | |
799 | return fsl_mc_driver_register(&dprc_driver); | |
800 | } | |
801 | ||
3c7b67f9 | 802 | void dprc_driver_exit(void) |
f2f2726b GR |
803 | { |
804 | fsl_mc_driver_unregister(&dprc_driver); | |
805 | } |