1 /*
2 * Freescale Management Complex (MC) bus 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
12 #include "../include/mc-private.h"
13 #include <linux/module.h>
14 #include <linux/of_device.h>
15 #include <linux/of_address.h>
16 #include <linux/ioport.h>
17 #include <linux/slab.h>
18 #include <linux/limits.h>
19 #include "../include/dpmng.h"
20 #include "../include/mc-sys.h"
21 #include "dprc-cmd.h"
22
23 static struct kmem_cache *mc_dev_cache;
24
25 /**
26 * fsl_mc_bus_match - device to driver matching callback
27 * @dev: the MC object device structure to match against
28 * @drv: the device driver to search for matching MC object device id
29 * structures
30 *
31 * Returns 1 on success, 0 otherwise.
32 */
fsl_mc_bus_match(struct device * dev,struct device_driver * drv)33 static int fsl_mc_bus_match(struct device *dev, struct device_driver *drv)
34 {
35 const struct fsl_mc_device_match_id *id;
36 struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
37 struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(drv);
38 bool found = false;
39 bool major_version_mismatch = false;
40 bool minor_version_mismatch = false;
41
42 if (WARN_ON(!fsl_mc_bus_type.dev_root))
43 goto out;
44
45 if (!mc_drv->match_id_table)
46 goto out;
47
48 /*
49 * If the object is not 'plugged' don't match.
50 * Only exception is the root DPRC, which is a special case.
51 */
52 if ((mc_dev->obj_desc.state & DPRC_OBJ_STATE_PLUGGED) == 0 &&
53 &mc_dev->dev != fsl_mc_bus_type.dev_root)
54 goto out;
55
56 /*
57 * Traverse the match_id table of the given driver, trying to find
58 * a matching for the given MC object device.
59 */
60 for (id = mc_drv->match_id_table; id->vendor != 0x0; id++) {
61 if (id->vendor == mc_dev->obj_desc.vendor &&
62 strcmp(id->obj_type, mc_dev->obj_desc.type) == 0) {
63 if (id->ver_major == mc_dev->obj_desc.ver_major) {
64 found = true;
65 if (id->ver_minor != mc_dev->obj_desc.ver_minor)
66 minor_version_mismatch = true;
67 } else {
68 major_version_mismatch = true;
69 }
70
71 break;
72 }
73 }
74
75 if (major_version_mismatch) {
76 dev_warn(dev,
77 "Major version mismatch: driver version %u.%u, MC object version %u.%u\n",
78 id->ver_major, id->ver_minor,
79 mc_dev->obj_desc.ver_major,
80 mc_dev->obj_desc.ver_minor);
81 } else if (minor_version_mismatch) {
82 dev_warn(dev,
83 "Minor version mismatch: driver version %u.%u, MC object version %u.%u\n",
84 id->ver_major, id->ver_minor,
85 mc_dev->obj_desc.ver_major,
86 mc_dev->obj_desc.ver_minor);
87 }
88
89 out:
90 dev_dbg(dev, "%smatched\n", found ? "" : "not ");
91 return found;
92 }
93
94 /**
95 * fsl_mc_bus_uevent - callback invoked when a device is added
96 */
fsl_mc_bus_uevent(struct device * dev,struct kobj_uevent_env * env)97 static int fsl_mc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
98 {
99 pr_debug("%s invoked\n", __func__);
100 return 0;
101 }
102
103 struct bus_type fsl_mc_bus_type = {
104 .name = "fsl-mc",
105 .match = fsl_mc_bus_match,
106 .uevent = fsl_mc_bus_uevent,
107 };
108 EXPORT_SYMBOL_GPL(fsl_mc_bus_type);
109
fsl_mc_driver_probe(struct device * dev)110 static int fsl_mc_driver_probe(struct device *dev)
111 {
112 struct fsl_mc_driver *mc_drv;
113 struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
114 int error;
115
116 if (WARN_ON(!dev->driver))
117 return -EINVAL;
118
119 mc_drv = to_fsl_mc_driver(dev->driver);
120 if (WARN_ON(!mc_drv->probe))
121 return -EINVAL;
122
123 error = mc_drv->probe(mc_dev);
124 if (error < 0) {
125 dev_err(dev, "MC object device probe callback failed: %d\n",
126 error);
127 return error;
128 }
129
130 return 0;
131 }
132
fsl_mc_driver_remove(struct device * dev)133 static int fsl_mc_driver_remove(struct device *dev)
134 {
135 struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
136 struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
137 int error;
138
139 if (WARN_ON(!dev->driver))
140 return -EINVAL;
141
142 error = mc_drv->remove(mc_dev);
143 if (error < 0) {
144 dev_err(dev,
145 "MC object device remove callback failed: %d\n",
146 error);
147 return error;
148 }
149
150 return 0;
151 }
152
fsl_mc_driver_shutdown(struct device * dev)153 static void fsl_mc_driver_shutdown(struct device *dev)
154 {
155 struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
156 struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
157
158 mc_drv->shutdown(mc_dev);
159 }
160
161 /**
162 * __fsl_mc_driver_register - registers a child device driver with the
163 * MC bus
164 *
165 * This function is implicitly invoked from the registration function of
166 * fsl_mc device drivers, which is generated by the
167 * module_fsl_mc_driver() macro.
168 */
__fsl_mc_driver_register(struct fsl_mc_driver * mc_driver,struct module * owner)169 int __fsl_mc_driver_register(struct fsl_mc_driver *mc_driver,
170 struct module *owner)
171 {
172 int error;
173
174 mc_driver->driver.owner = owner;
175 mc_driver->driver.bus = &fsl_mc_bus_type;
176
177 if (mc_driver->probe)
178 mc_driver->driver.probe = fsl_mc_driver_probe;
179
180 if (mc_driver->remove)
181 mc_driver->driver.remove = fsl_mc_driver_remove;
182
183 if (mc_driver->shutdown)
184 mc_driver->driver.shutdown = fsl_mc_driver_shutdown;
185
186 error = driver_register(&mc_driver->driver);
187 if (error < 0) {
188 pr_err("driver_register() failed for %s: %d\n",
189 mc_driver->driver.name, error);
190 return error;
191 }
192
193 pr_info("MC object device driver %s registered\n",
194 mc_driver->driver.name);
195 return 0;
196 }
197 EXPORT_SYMBOL_GPL(__fsl_mc_driver_register);
198
199 /**
200 * fsl_mc_driver_unregister - unregisters a device driver from the
201 * MC bus
202 */
fsl_mc_driver_unregister(struct fsl_mc_driver * mc_driver)203 void fsl_mc_driver_unregister(struct fsl_mc_driver *mc_driver)
204 {
205 driver_unregister(&mc_driver->driver);
206 }
207 EXPORT_SYMBOL_GPL(fsl_mc_driver_unregister);
208
get_dprc_icid(struct fsl_mc_io * mc_io,int container_id,uint16_t * icid)209 static int get_dprc_icid(struct fsl_mc_io *mc_io,
210 int container_id, uint16_t *icid)
211 {
212 uint16_t dprc_handle;
213 struct dprc_attributes attr;
214 int error;
215
216 error = dprc_open(mc_io, container_id, &dprc_handle);
217 if (error < 0) {
218 pr_err("dprc_open() failed: %d\n", error);
219 return error;
220 }
221
222 memset(&attr, 0, sizeof(attr));
223 error = dprc_get_attributes(mc_io, dprc_handle, &attr);
224 if (error < 0) {
225 pr_err("dprc_get_attributes() failed: %d\n", error);
226 goto common_cleanup;
227 }
228
229 *icid = attr.icid;
230 error = 0;
231
232 common_cleanup:
233 (void)dprc_close(mc_io, dprc_handle);
234 return error;
235 }
236
translate_mc_addr(uint64_t mc_addr,phys_addr_t * phys_addr)237 static int translate_mc_addr(uint64_t mc_addr, phys_addr_t *phys_addr)
238 {
239 int i;
240 struct fsl_mc *mc = dev_get_drvdata(fsl_mc_bus_type.dev_root->parent);
241
242 if (mc->num_translation_ranges == 0) {
243 /*
244 * Do identity mapping:
245 */
246 *phys_addr = mc_addr;
247 return 0;
248 }
249
250 for (i = 0; i < mc->num_translation_ranges; i++) {
251 struct fsl_mc_addr_translation_range *range =
252 &mc->translation_ranges[i];
253
254 if (mc_addr >= range->start_mc_addr &&
255 mc_addr < range->end_mc_addr) {
256 *phys_addr = range->start_phys_addr +
257 (mc_addr - range->start_mc_addr);
258 return 0;
259 }
260 }
261
262 return -EFAULT;
263 }
264
fsl_mc_device_get_mmio_regions(struct fsl_mc_device * mc_dev,struct fsl_mc_device * mc_bus_dev)265 static int fsl_mc_device_get_mmio_regions(struct fsl_mc_device *mc_dev,
266 struct fsl_mc_device *mc_bus_dev)
267 {
268 int i;
269 int error;
270 struct resource *regions;
271 struct dprc_obj_desc *obj_desc = &mc_dev->obj_desc;
272 struct device *parent_dev = mc_dev->dev.parent;
273
274 regions = kmalloc_array(obj_desc->region_count,
275 sizeof(regions[0]), GFP_KERNEL);
276 if (!regions)
277 return -ENOMEM;
278
279 for (i = 0; i < obj_desc->region_count; i++) {
280 struct dprc_region_desc region_desc;
281
282 error = dprc_get_obj_region(mc_bus_dev->mc_io,
283 mc_bus_dev->mc_handle,
284 obj_desc->type,
285 obj_desc->id, i, ®ion_desc);
286 if (error < 0) {
287 dev_err(parent_dev,
288 "dprc_get_obj_region() failed: %d\n", error);
289 goto error_cleanup_regions;
290 }
291
292 WARN_ON(region_desc.base_paddr == 0x0);
293 WARN_ON(region_desc.size == 0);
294 error = translate_mc_addr(region_desc.base_paddr,
295 ®ions[i].start);
296 if (error < 0) {
297 dev_err(parent_dev,
298 "Invalid MC address: %#llx\n",
299 region_desc.base_paddr);
300 goto error_cleanup_regions;
301 }
302
303 regions[i].end = regions[i].start + region_desc.size - 1;
304 regions[i].name = "fsl-mc object MMIO region";
305 regions[i].flags = IORESOURCE_IO;
306 }
307
308 mc_dev->regions = regions;
309 return 0;
310
311 error_cleanup_regions:
312 kfree(regions);
313 return error;
314 }
315
316 /**
317 * Add a newly discovered MC object device to be visible in Linux
318 */
fsl_mc_device_add(struct dprc_obj_desc * obj_desc,struct fsl_mc_io * mc_io,struct device * parent_dev,struct fsl_mc_device ** new_mc_dev)319 int fsl_mc_device_add(struct dprc_obj_desc *obj_desc,
320 struct fsl_mc_io *mc_io,
321 struct device *parent_dev,
322 struct fsl_mc_device **new_mc_dev)
323 {
324 int error;
325 struct fsl_mc_device *mc_dev = NULL;
326 struct fsl_mc_bus *mc_bus = NULL;
327 struct fsl_mc_device *parent_mc_dev;
328
329 if (parent_dev->bus == &fsl_mc_bus_type)
330 parent_mc_dev = to_fsl_mc_device(parent_dev);
331 else
332 parent_mc_dev = NULL;
333
334 if (strcmp(obj_desc->type, "dprc") == 0) {
335 /*
336 * Allocate an MC bus device object:
337 */
338 mc_bus = devm_kzalloc(parent_dev, sizeof(*mc_bus), GFP_KERNEL);
339 if (!mc_bus)
340 return -ENOMEM;
341
342 mc_dev = &mc_bus->mc_dev;
343 } else {
344 /*
345 * Allocate a regular fsl_mc_device object:
346 */
347 mc_dev = kmem_cache_zalloc(mc_dev_cache, GFP_KERNEL);
348 if (!mc_dev)
349 return -ENOMEM;
350 }
351
352 mc_dev->obj_desc = *obj_desc;
353 mc_dev->mc_io = mc_io;
354 device_initialize(&mc_dev->dev);
355 mc_dev->dev.parent = parent_dev;
356 mc_dev->dev.bus = &fsl_mc_bus_type;
357 dev_set_name(&mc_dev->dev, "%s.%d", obj_desc->type, obj_desc->id);
358
359 if (strcmp(obj_desc->type, "dprc") == 0) {
360 struct fsl_mc_io *mc_io2;
361
362 mc_dev->flags |= FSL_MC_IS_DPRC;
363
364 /*
365 * To get the DPRC's ICID, we need to open the DPRC
366 * in get_dprc_icid(). For child DPRCs, we do so using the
367 * parent DPRC's MC portal instead of the child DPRC's MC
368 * portal, in case the child DPRC is already opened with
369 * its own portal (e.g., the DPRC used by AIOP).
370 *
371 * NOTE: There cannot be more than one active open for a
372 * given MC object, using the same MC portal.
373 */
374 if (parent_mc_dev) {
375 /*
376 * device being added is a child DPRC device
377 */
378 mc_io2 = parent_mc_dev->mc_io;
379 } else {
380 /*
381 * device being added is the root DPRC device
382 */
383 if (WARN_ON(!mc_io)) {
384 error = -EINVAL;
385 goto error_cleanup_dev;
386 }
387
388 mc_io2 = mc_io;
389
390 if (!fsl_mc_bus_type.dev_root)
391 fsl_mc_bus_type.dev_root = &mc_dev->dev;
392 }
393
394 error = get_dprc_icid(mc_io2, obj_desc->id, &mc_dev->icid);
395 if (error < 0)
396 goto error_cleanup_dev;
397 } else {
398 /*
399 * A non-DPRC MC object device has to be a child of another
400 * MC object (specifically a DPRC object)
401 */
402 mc_dev->icid = parent_mc_dev->icid;
403 mc_dev->dma_mask = FSL_MC_DEFAULT_DMA_MASK;
404 mc_dev->dev.dma_mask = &mc_dev->dma_mask;
405 }
406
407 /*
408 * Get MMIO regions for the device from the MC:
409 *
410 * NOTE: the root DPRC is a special case as its MMIO region is
411 * obtained from the device tree
412 */
413 if (parent_mc_dev && obj_desc->region_count != 0) {
414 error = fsl_mc_device_get_mmio_regions(mc_dev,
415 parent_mc_dev);
416 if (error < 0)
417 goto error_cleanup_dev;
418 }
419
420 /*
421 * The device-specific probe callback will get invoked by device_add()
422 */
423 error = device_add(&mc_dev->dev);
424 if (error < 0) {
425 dev_err(parent_dev,
426 "device_add() failed for device %s: %d\n",
427 dev_name(&mc_dev->dev), error);
428 goto error_cleanup_dev;
429 }
430
431 (void)get_device(&mc_dev->dev);
432 dev_dbg(parent_dev, "Added MC object device %s\n",
433 dev_name(&mc_dev->dev));
434
435 *new_mc_dev = mc_dev;
436 return 0;
437
438 error_cleanup_dev:
439 kfree(mc_dev->regions);
440 if (mc_bus)
441 devm_kfree(parent_dev, mc_bus);
442 else
443 kmem_cache_free(mc_dev_cache, mc_dev);
444
445 return error;
446 }
447 EXPORT_SYMBOL_GPL(fsl_mc_device_add);
448
449 /**
450 * fsl_mc_device_remove - Remove a MC object device from being visible to
451 * Linux
452 *
453 * @mc_dev: Pointer to a MC object device object
454 */
fsl_mc_device_remove(struct fsl_mc_device * mc_dev)455 void fsl_mc_device_remove(struct fsl_mc_device *mc_dev)
456 {
457 struct fsl_mc_bus *mc_bus = NULL;
458
459 kfree(mc_dev->regions);
460
461 /*
462 * The device-specific remove callback will get invoked by device_del()
463 */
464 device_del(&mc_dev->dev);
465 put_device(&mc_dev->dev);
466
467 if (strcmp(mc_dev->obj_desc.type, "dprc") == 0) {
468 mc_bus = to_fsl_mc_bus(mc_dev);
469 if (mc_dev->mc_io) {
470 fsl_destroy_mc_io(mc_dev->mc_io);
471 mc_dev->mc_io = NULL;
472 }
473
474 if (&mc_dev->dev == fsl_mc_bus_type.dev_root)
475 fsl_mc_bus_type.dev_root = NULL;
476 }
477
478 if (mc_bus)
479 devm_kfree(mc_dev->dev.parent, mc_bus);
480 else
481 kmem_cache_free(mc_dev_cache, mc_dev);
482 }
483 EXPORT_SYMBOL_GPL(fsl_mc_device_remove);
484
parse_mc_ranges(struct device * dev,int * paddr_cells,int * mc_addr_cells,int * mc_size_cells,const __be32 ** ranges_start,uint8_t * num_ranges)485 static int parse_mc_ranges(struct device *dev,
486 int *paddr_cells,
487 int *mc_addr_cells,
488 int *mc_size_cells,
489 const __be32 **ranges_start,
490 uint8_t *num_ranges)
491 {
492 const __be32 *prop;
493 int range_tuple_cell_count;
494 int ranges_len;
495 int tuple_len;
496 struct device_node *mc_node = dev->of_node;
497
498 *ranges_start = of_get_property(mc_node, "ranges", &ranges_len);
499 if (!(*ranges_start) || !ranges_len) {
500 dev_warn(dev,
501 "missing or empty ranges property for device tree node '%s'\n",
502 mc_node->name);
503
504 *num_ranges = 0;
505 return 0;
506 }
507
508 *paddr_cells = of_n_addr_cells(mc_node);
509
510 prop = of_get_property(mc_node, "#address-cells", NULL);
511 if (prop)
512 *mc_addr_cells = be32_to_cpup(prop);
513 else
514 *mc_addr_cells = *paddr_cells;
515
516 prop = of_get_property(mc_node, "#size-cells", NULL);
517 if (prop)
518 *mc_size_cells = be32_to_cpup(prop);
519 else
520 *mc_size_cells = of_n_size_cells(mc_node);
521
522 range_tuple_cell_count = *paddr_cells + *mc_addr_cells +
523 *mc_size_cells;
524
525 tuple_len = range_tuple_cell_count * sizeof(__be32);
526 if (ranges_len % tuple_len != 0) {
527 dev_err(dev, "malformed ranges property '%s'\n", mc_node->name);
528 return -EINVAL;
529 }
530
531 *num_ranges = ranges_len / tuple_len;
532 return 0;
533 }
534
get_mc_addr_translation_ranges(struct device * dev,struct fsl_mc_addr_translation_range ** ranges,uint8_t * num_ranges)535 static int get_mc_addr_translation_ranges(struct device *dev,
536 struct fsl_mc_addr_translation_range
537 **ranges,
538 uint8_t *num_ranges)
539 {
540 int error;
541 int paddr_cells;
542 int mc_addr_cells;
543 int mc_size_cells;
544 int i;
545 const __be32 *ranges_start;
546 const __be32 *cell;
547
548 error = parse_mc_ranges(dev,
549 &paddr_cells,
550 &mc_addr_cells,
551 &mc_size_cells,
552 &ranges_start,
553 num_ranges);
554 if (error < 0)
555 return error;
556
557 if (!(*num_ranges)) {
558 /*
559 * Missing or empty ranges property ("ranges;") for the
560 * 'fsl,qoriq-mc' node. In this case, identity mapping
561 * will be used.
562 */
563 *ranges = NULL;
564 return 0;
565 }
566
567 *ranges = devm_kcalloc(dev, *num_ranges,
568 sizeof(struct fsl_mc_addr_translation_range),
569 GFP_KERNEL);
570 if (!(*ranges))
571 return -ENOMEM;
572
573 cell = ranges_start;
574 for (i = 0; i < *num_ranges; ++i) {
575 struct fsl_mc_addr_translation_range *range = &(*ranges)[i];
576
577 range->start_mc_addr = of_read_number(cell, mc_addr_cells);
578 cell += mc_addr_cells;
579 range->start_phys_addr = of_read_number(cell, paddr_cells);
580 cell += paddr_cells;
581 range->end_mc_addr = range->start_mc_addr +
582 of_read_number(cell, mc_size_cells);
583
584 cell += mc_size_cells;
585 }
586
587 return 0;
588 }
589
590 /**
591 * fsl_mc_bus_probe - callback invoked when the root MC bus is being
592 * added
593 */
fsl_mc_bus_probe(struct platform_device * pdev)594 static int fsl_mc_bus_probe(struct platform_device *pdev)
595 {
596 struct dprc_obj_desc obj_desc;
597 int error;
598 struct fsl_mc *mc;
599 struct fsl_mc_device *mc_bus_dev = NULL;
600 struct fsl_mc_io *mc_io = NULL;
601 int container_id;
602 phys_addr_t mc_portal_phys_addr;
603 uint32_t mc_portal_size;
604 struct mc_version mc_version;
605 struct resource res;
606
607 dev_info(&pdev->dev, "Root MC bus device probed");
608
609 mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
610 if (!mc)
611 return -ENOMEM;
612
613 platform_set_drvdata(pdev, mc);
614
615 /*
616 * Get physical address of MC portal for the root DPRC:
617 */
618 error = of_address_to_resource(pdev->dev.of_node, 0, &res);
619 if (error < 0) {
620 dev_err(&pdev->dev,
621 "of_address_to_resource() failed for %s\n",
622 pdev->dev.of_node->full_name);
623 return error;
624 }
625
626 mc_portal_phys_addr = res.start;
627 mc_portal_size = resource_size(&res);
628 error = fsl_create_mc_io(&pdev->dev, mc_portal_phys_addr,
629 mc_portal_size, NULL, 0, &mc_io);
630 if (error < 0)
631 return error;
632
633 error = mc_get_version(mc_io, &mc_version);
634 if (error != 0) {
635 dev_err(&pdev->dev,
636 "mc_get_version() failed with error %d\n", error);
637 goto error_cleanup_mc_io;
638 }
639
640 dev_info(&pdev->dev,
641 "Freescale Management Complex Firmware version: %u.%u.%u\n",
642 mc_version.major, mc_version.minor, mc_version.revision);
643
644 if (mc_version.major < MC_VER_MAJOR) {
645 dev_err(&pdev->dev,
646 "ERROR: MC firmware version not supported by driver (driver version: %u.%u)\n",
647 MC_VER_MAJOR, MC_VER_MINOR);
648 error = -ENOTSUPP;
649 goto error_cleanup_mc_io;
650 }
651
652 if (mc_version.major > MC_VER_MAJOR) {
653 dev_warn(&pdev->dev,
654 "WARNING: driver may not support newer MC firmware features (driver version: %u.%u)\n",
655 MC_VER_MAJOR, MC_VER_MINOR);
656 }
657
658 error = get_mc_addr_translation_ranges(&pdev->dev,
659 &mc->translation_ranges,
660 &mc->num_translation_ranges);
661 if (error < 0)
662 goto error_cleanup_mc_io;
663
664 error = dpmng_get_container_id(mc_io, &container_id);
665 if (error < 0) {
666 dev_err(&pdev->dev,
667 "dpmng_get_container_id() failed: %d\n", error);
668 goto error_cleanup_mc_io;
669 }
670
671 obj_desc.vendor = FSL_MC_VENDOR_FREESCALE;
672 strcpy(obj_desc.type, "dprc");
673 obj_desc.id = container_id;
674 obj_desc.ver_major = DPRC_VER_MAJOR;
675 obj_desc.ver_minor = DPRC_VER_MINOR;
676 obj_desc.region_count = 0;
677
678 error = fsl_mc_device_add(&obj_desc, mc_io, &pdev->dev, &mc_bus_dev);
679 if (error < 0)
680 goto error_cleanup_mc_io;
681
682 mc->root_mc_bus_dev = mc_bus_dev;
683 return 0;
684
685 error_cleanup_mc_io:
686 fsl_destroy_mc_io(mc_io);
687 return error;
688 }
689
690 /**
691 * fsl_mc_bus_remove - callback invoked when the root MC bus is being
692 * removed
693 */
fsl_mc_bus_remove(struct platform_device * pdev)694 static int fsl_mc_bus_remove(struct platform_device *pdev)
695 {
696 struct fsl_mc *mc = platform_get_drvdata(pdev);
697
698 if (WARN_ON(&mc->root_mc_bus_dev->dev != fsl_mc_bus_type.dev_root))
699 return -EINVAL;
700
701 fsl_mc_device_remove(mc->root_mc_bus_dev);
702 dev_info(&pdev->dev, "Root MC bus device removed");
703 return 0;
704 }
705
706 static const struct of_device_id fsl_mc_bus_match_table[] = {
707 {.compatible = "fsl,qoriq-mc",},
708 {},
709 };
710
711 MODULE_DEVICE_TABLE(of, fsl_mc_bus_match_table);
712
713 static struct platform_driver fsl_mc_bus_driver = {
714 .driver = {
715 .name = "fsl_mc_bus",
716 .owner = THIS_MODULE,
717 .pm = NULL,
718 .of_match_table = fsl_mc_bus_match_table,
719 },
720 .probe = fsl_mc_bus_probe,
721 .remove = fsl_mc_bus_remove,
722 };
723
fsl_mc_bus_driver_init(void)724 static int __init fsl_mc_bus_driver_init(void)
725 {
726 int error;
727
728 mc_dev_cache = kmem_cache_create("fsl_mc_device",
729 sizeof(struct fsl_mc_device), 0, 0,
730 NULL);
731 if (!mc_dev_cache) {
732 pr_err("Could not create fsl_mc_device cache\n");
733 return -ENOMEM;
734 }
735
736 error = bus_register(&fsl_mc_bus_type);
737 if (error < 0) {
738 pr_err("fsl-mc bus type registration failed: %d\n", error);
739 goto error_cleanup_cache;
740 }
741
742 pr_info("fsl-mc bus type registered\n");
743
744 error = platform_driver_register(&fsl_mc_bus_driver);
745 if (error < 0) {
746 pr_err("platform_driver_register() failed: %d\n", error);
747 goto error_cleanup_bus;
748 }
749
750 error = dprc_driver_init();
751 if (error < 0)
752 goto error_cleanup_driver;
753
754 error = fsl_mc_allocator_driver_init();
755 if (error < 0)
756 goto error_cleanup_dprc_driver;
757
758 return 0;
759
760 error_cleanup_dprc_driver:
761 dprc_driver_exit();
762
763 error_cleanup_driver:
764 platform_driver_unregister(&fsl_mc_bus_driver);
765
766 error_cleanup_bus:
767 bus_unregister(&fsl_mc_bus_type);
768
769 error_cleanup_cache:
770 kmem_cache_destroy(mc_dev_cache);
771 return error;
772 }
773
774 postcore_initcall(fsl_mc_bus_driver_init);
775
fsl_mc_bus_driver_exit(void)776 static void __exit fsl_mc_bus_driver_exit(void)
777 {
778 if (WARN_ON(!mc_dev_cache))
779 return;
780
781 fsl_mc_allocator_driver_exit();
782 dprc_driver_exit();
783 platform_driver_unregister(&fsl_mc_bus_driver);
784 bus_unregister(&fsl_mc_bus_type);
785 kmem_cache_destroy(mc_dev_cache);
786 pr_info("MC bus unregistered\n");
787 }
788
789 module_exit(fsl_mc_bus_driver_exit);
790
791 MODULE_AUTHOR("Freescale Semiconductor Inc.");
792 MODULE_DESCRIPTION("Freescale Management Complex (MC) bus driver");
793 MODULE_LICENSE("GPL");
794