1 /*
2  *  PS3 system bus driver.
3  *
4  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
5  *  Copyright 2006 Sony Corp.
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License as published by
9  *  the Free Software Foundation; version 2 of the License.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, write to the Free Software
18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  */
20 
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/export.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/err.h>
26 #include <linux/slab.h>
27 
28 #include <asm/udbg.h>
29 #include <asm/lv1call.h>
30 #include <asm/firmware.h>
31 #include <asm/cell-regs.h>
32 
33 #include "platform.h"
34 
35 static struct device ps3_system_bus = {
36 	.init_name = "ps3_system",
37 };
38 
39 /* FIXME: need device usage counters! */
40 static struct {
41 	struct mutex mutex;
42 	int sb_11; /* usb 0 */
43 	int sb_12; /* usb 0 */
44 	int gpu;
45 } usage_hack;
46 
47 static int ps3_is_device(struct ps3_system_bus_device *dev, u64 bus_id,
48 			 u64 dev_id)
49 {
50 	return dev->bus_id == bus_id && dev->dev_id == dev_id;
51 }
52 
53 static int ps3_open_hv_device_sb(struct ps3_system_bus_device *dev)
54 {
55 	int result;
56 
57 	BUG_ON(!dev->bus_id);
58 	mutex_lock(&usage_hack.mutex);
59 
60 	if (ps3_is_device(dev, 1, 1)) {
61 		usage_hack.sb_11++;
62 		if (usage_hack.sb_11 > 1) {
63 			result = 0;
64 			goto done;
65 		}
66 	}
67 
68 	if (ps3_is_device(dev, 1, 2)) {
69 		usage_hack.sb_12++;
70 		if (usage_hack.sb_12 > 1) {
71 			result = 0;
72 			goto done;
73 		}
74 	}
75 
76 	result = lv1_open_device(dev->bus_id, dev->dev_id, 0);
77 
78 	if (result) {
79 		pr_debug("%s:%d: lv1_open_device failed: %s\n", __func__,
80 			__LINE__, ps3_result(result));
81 			result = -EPERM;
82 	}
83 
84 done:
85 	mutex_unlock(&usage_hack.mutex);
86 	return result;
87 }
88 
89 static int ps3_close_hv_device_sb(struct ps3_system_bus_device *dev)
90 {
91 	int result;
92 
93 	BUG_ON(!dev->bus_id);
94 	mutex_lock(&usage_hack.mutex);
95 
96 	if (ps3_is_device(dev, 1, 1)) {
97 		usage_hack.sb_11--;
98 		if (usage_hack.sb_11) {
99 			result = 0;
100 			goto done;
101 		}
102 	}
103 
104 	if (ps3_is_device(dev, 1, 2)) {
105 		usage_hack.sb_12--;
106 		if (usage_hack.sb_12) {
107 			result = 0;
108 			goto done;
109 		}
110 	}
111 
112 	result = lv1_close_device(dev->bus_id, dev->dev_id);
113 	BUG_ON(result);
114 
115 done:
116 	mutex_unlock(&usage_hack.mutex);
117 	return result;
118 }
119 
120 static int ps3_open_hv_device_gpu(struct ps3_system_bus_device *dev)
121 {
122 	int result;
123 
124 	mutex_lock(&usage_hack.mutex);
125 
126 	usage_hack.gpu++;
127 	if (usage_hack.gpu > 1) {
128 		result = 0;
129 		goto done;
130 	}
131 
132 	result = lv1_gpu_open(0);
133 
134 	if (result) {
135 		pr_debug("%s:%d: lv1_gpu_open failed: %s\n", __func__,
136 			__LINE__, ps3_result(result));
137 			result = -EPERM;
138 	}
139 
140 done:
141 	mutex_unlock(&usage_hack.mutex);
142 	return result;
143 }
144 
145 static int ps3_close_hv_device_gpu(struct ps3_system_bus_device *dev)
146 {
147 	int result;
148 
149 	mutex_lock(&usage_hack.mutex);
150 
151 	usage_hack.gpu--;
152 	if (usage_hack.gpu) {
153 		result = 0;
154 		goto done;
155 	}
156 
157 	result = lv1_gpu_close();
158 	BUG_ON(result);
159 
160 done:
161 	mutex_unlock(&usage_hack.mutex);
162 	return result;
163 }
164 
165 int ps3_open_hv_device(struct ps3_system_bus_device *dev)
166 {
167 	BUG_ON(!dev);
168 	pr_debug("%s:%d: match_id: %u\n", __func__, __LINE__, dev->match_id);
169 
170 	switch (dev->match_id) {
171 	case PS3_MATCH_ID_EHCI:
172 	case PS3_MATCH_ID_OHCI:
173 	case PS3_MATCH_ID_GELIC:
174 	case PS3_MATCH_ID_STOR_DISK:
175 	case PS3_MATCH_ID_STOR_ROM:
176 	case PS3_MATCH_ID_STOR_FLASH:
177 		return ps3_open_hv_device_sb(dev);
178 
179 	case PS3_MATCH_ID_SOUND:
180 	case PS3_MATCH_ID_GPU:
181 		return ps3_open_hv_device_gpu(dev);
182 
183 	case PS3_MATCH_ID_AV_SETTINGS:
184 	case PS3_MATCH_ID_SYSTEM_MANAGER:
185 		pr_debug("%s:%d: unsupported match_id: %u\n", __func__,
186 			__LINE__, dev->match_id);
187 		pr_debug("%s:%d: bus_id: %llu\n", __func__, __LINE__,
188 			dev->bus_id);
189 		BUG();
190 		return -EINVAL;
191 
192 	default:
193 		break;
194 	}
195 
196 	pr_debug("%s:%d: unknown match_id: %u\n", __func__, __LINE__,
197 		dev->match_id);
198 	BUG();
199 	return -ENODEV;
200 }
201 EXPORT_SYMBOL_GPL(ps3_open_hv_device);
202 
203 int ps3_close_hv_device(struct ps3_system_bus_device *dev)
204 {
205 	BUG_ON(!dev);
206 	pr_debug("%s:%d: match_id: %u\n", __func__, __LINE__, dev->match_id);
207 
208 	switch (dev->match_id) {
209 	case PS3_MATCH_ID_EHCI:
210 	case PS3_MATCH_ID_OHCI:
211 	case PS3_MATCH_ID_GELIC:
212 	case PS3_MATCH_ID_STOR_DISK:
213 	case PS3_MATCH_ID_STOR_ROM:
214 	case PS3_MATCH_ID_STOR_FLASH:
215 		return ps3_close_hv_device_sb(dev);
216 
217 	case PS3_MATCH_ID_SOUND:
218 	case PS3_MATCH_ID_GPU:
219 		return ps3_close_hv_device_gpu(dev);
220 
221 	case PS3_MATCH_ID_AV_SETTINGS:
222 	case PS3_MATCH_ID_SYSTEM_MANAGER:
223 		pr_debug("%s:%d: unsupported match_id: %u\n", __func__,
224 			__LINE__, dev->match_id);
225 		pr_debug("%s:%d: bus_id: %llu\n", __func__, __LINE__,
226 			dev->bus_id);
227 		BUG();
228 		return -EINVAL;
229 
230 	default:
231 		break;
232 	}
233 
234 	pr_debug("%s:%d: unknown match_id: %u\n", __func__, __LINE__,
235 		dev->match_id);
236 	BUG();
237 	return -ENODEV;
238 }
239 EXPORT_SYMBOL_GPL(ps3_close_hv_device);
240 
241 #define dump_mmio_region(_a) _dump_mmio_region(_a, __func__, __LINE__)
242 static void _dump_mmio_region(const struct ps3_mmio_region* r,
243 	const char* func, int line)
244 {
245 	pr_debug("%s:%d: dev       %llu:%llu\n", func, line, r->dev->bus_id,
246 		r->dev->dev_id);
247 	pr_debug("%s:%d: bus_addr  %lxh\n", func, line, r->bus_addr);
248 	pr_debug("%s:%d: len       %lxh\n", func, line, r->len);
249 	pr_debug("%s:%d: lpar_addr %lxh\n", func, line, r->lpar_addr);
250 }
251 
252 static int ps3_sb_mmio_region_create(struct ps3_mmio_region *r)
253 {
254 	int result;
255 	u64 lpar_addr;
256 
257 	result = lv1_map_device_mmio_region(r->dev->bus_id, r->dev->dev_id,
258 		r->bus_addr, r->len, r->page_size, &lpar_addr);
259 	r->lpar_addr = lpar_addr;
260 
261 	if (result) {
262 		pr_debug("%s:%d: lv1_map_device_mmio_region failed: %s\n",
263 			__func__, __LINE__, ps3_result(result));
264 		r->lpar_addr = 0;
265 	}
266 
267 	dump_mmio_region(r);
268 	return result;
269 }
270 
271 static int ps3_ioc0_mmio_region_create(struct ps3_mmio_region *r)
272 {
273 	/* device specific; do nothing currently */
274 	return 0;
275 }
276 
277 int ps3_mmio_region_create(struct ps3_mmio_region *r)
278 {
279 	return r->mmio_ops->create(r);
280 }
281 EXPORT_SYMBOL_GPL(ps3_mmio_region_create);
282 
283 static int ps3_sb_free_mmio_region(struct ps3_mmio_region *r)
284 {
285 	int result;
286 
287 	dump_mmio_region(r);
288 	result = lv1_unmap_device_mmio_region(r->dev->bus_id, r->dev->dev_id,
289 		r->lpar_addr);
290 
291 	if (result)
292 		pr_debug("%s:%d: lv1_unmap_device_mmio_region failed: %s\n",
293 			__func__, __LINE__, ps3_result(result));
294 
295 	r->lpar_addr = 0;
296 	return result;
297 }
298 
299 static int ps3_ioc0_free_mmio_region(struct ps3_mmio_region *r)
300 {
301 	/* device specific; do nothing currently */
302 	return 0;
303 }
304 
305 
306 int ps3_free_mmio_region(struct ps3_mmio_region *r)
307 {
308 	return r->mmio_ops->free(r);
309 }
310 
311 EXPORT_SYMBOL_GPL(ps3_free_mmio_region);
312 
313 static const struct ps3_mmio_region_ops ps3_mmio_sb_region_ops = {
314 	.create = ps3_sb_mmio_region_create,
315 	.free = ps3_sb_free_mmio_region
316 };
317 
318 static const struct ps3_mmio_region_ops ps3_mmio_ioc0_region_ops = {
319 	.create = ps3_ioc0_mmio_region_create,
320 	.free = ps3_ioc0_free_mmio_region
321 };
322 
323 int ps3_mmio_region_init(struct ps3_system_bus_device *dev,
324 	struct ps3_mmio_region *r, unsigned long bus_addr, unsigned long len,
325 	enum ps3_mmio_page_size page_size)
326 {
327 	r->dev = dev;
328 	r->bus_addr = bus_addr;
329 	r->len = len;
330 	r->page_size = page_size;
331 	switch (dev->dev_type) {
332 	case PS3_DEVICE_TYPE_SB:
333 		r->mmio_ops = &ps3_mmio_sb_region_ops;
334 		break;
335 	case PS3_DEVICE_TYPE_IOC0:
336 		r->mmio_ops = &ps3_mmio_ioc0_region_ops;
337 		break;
338 	default:
339 		BUG();
340 		return -EINVAL;
341 	}
342 	return 0;
343 }
344 EXPORT_SYMBOL_GPL(ps3_mmio_region_init);
345 
346 static int ps3_system_bus_match(struct device *_dev,
347 	struct device_driver *_drv)
348 {
349 	int result;
350 	struct ps3_system_bus_driver *drv = ps3_drv_to_system_bus_drv(_drv);
351 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
352 
353 	if (!dev->match_sub_id)
354 		result = dev->match_id == drv->match_id;
355 	else
356 		result = dev->match_sub_id == drv->match_sub_id &&
357 			dev->match_id == drv->match_id;
358 
359 	if (result)
360 		pr_info("%s:%d: dev=%u.%u(%s), drv=%u.%u(%s): match\n",
361 			__func__, __LINE__,
362 			dev->match_id, dev->match_sub_id, dev_name(&dev->core),
363 			drv->match_id, drv->match_sub_id, drv->core.name);
364 	else
365 		pr_debug("%s:%d: dev=%u.%u(%s), drv=%u.%u(%s): miss\n",
366 			__func__, __LINE__,
367 			dev->match_id, dev->match_sub_id, dev_name(&dev->core),
368 			drv->match_id, drv->match_sub_id, drv->core.name);
369 
370 	return result;
371 }
372 
373 static int ps3_system_bus_probe(struct device *_dev)
374 {
375 	int result = 0;
376 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
377 	struct ps3_system_bus_driver *drv;
378 
379 	BUG_ON(!dev);
380 	dev_dbg(_dev, "%s:%d\n", __func__, __LINE__);
381 
382 	drv = ps3_system_bus_dev_to_system_bus_drv(dev);
383 	BUG_ON(!drv);
384 
385 	if (drv->probe)
386 		result = drv->probe(dev);
387 	else
388 		pr_debug("%s:%d: %s no probe method\n", __func__, __LINE__,
389 			dev_name(&dev->core));
390 
391 	pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, dev_name(&dev->core));
392 	return result;
393 }
394 
395 static int ps3_system_bus_remove(struct device *_dev)
396 {
397 	int result = 0;
398 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
399 	struct ps3_system_bus_driver *drv;
400 
401 	BUG_ON(!dev);
402 	dev_dbg(_dev, "%s:%d\n", __func__, __LINE__);
403 
404 	drv = ps3_system_bus_dev_to_system_bus_drv(dev);
405 	BUG_ON(!drv);
406 
407 	if (drv->remove)
408 		result = drv->remove(dev);
409 	else
410 		dev_dbg(&dev->core, "%s:%d %s: no remove method\n",
411 			__func__, __LINE__, drv->core.name);
412 
413 	pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, dev_name(&dev->core));
414 	return result;
415 }
416 
417 static void ps3_system_bus_shutdown(struct device *_dev)
418 {
419 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
420 	struct ps3_system_bus_driver *drv;
421 
422 	BUG_ON(!dev);
423 
424 	dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
425 		dev->match_id);
426 
427 	if (!dev->core.driver) {
428 		dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
429 			__LINE__);
430 		return;
431 	}
432 
433 	drv = ps3_system_bus_dev_to_system_bus_drv(dev);
434 
435 	BUG_ON(!drv);
436 
437 	dev_dbg(&dev->core, "%s:%d: %s -> %s\n", __func__, __LINE__,
438 		dev_name(&dev->core), drv->core.name);
439 
440 	if (drv->shutdown)
441 		drv->shutdown(dev);
442 	else if (drv->remove) {
443 		dev_dbg(&dev->core, "%s:%d %s: no shutdown, calling remove\n",
444 			__func__, __LINE__, drv->core.name);
445 		drv->remove(dev);
446 	} else {
447 		dev_dbg(&dev->core, "%s:%d %s: no shutdown method\n",
448 			__func__, __LINE__, drv->core.name);
449 		BUG();
450 	}
451 
452 	dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
453 }
454 
455 static int ps3_system_bus_uevent(struct device *_dev, struct kobj_uevent_env *env)
456 {
457 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
458 
459 	if (add_uevent_var(env, "MODALIAS=ps3:%d:%d", dev->match_id,
460 			   dev->match_sub_id))
461 		return -ENOMEM;
462 	return 0;
463 }
464 
465 static ssize_t modalias_show(struct device *_dev, struct device_attribute *a,
466 	char *buf)
467 {
468 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
469 	int len = snprintf(buf, PAGE_SIZE, "ps3:%d:%d\n", dev->match_id,
470 			   dev->match_sub_id);
471 
472 	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
473 }
474 static DEVICE_ATTR_RO(modalias);
475 
476 static struct attribute *ps3_system_bus_dev_attrs[] = {
477 	&dev_attr_modalias.attr,
478 	NULL,
479 };
480 ATTRIBUTE_GROUPS(ps3_system_bus_dev);
481 
482 struct bus_type ps3_system_bus_type = {
483 	.name = "ps3_system_bus",
484 	.match = ps3_system_bus_match,
485 	.uevent = ps3_system_bus_uevent,
486 	.probe = ps3_system_bus_probe,
487 	.remove = ps3_system_bus_remove,
488 	.shutdown = ps3_system_bus_shutdown,
489 	.dev_groups = ps3_system_bus_dev_groups,
490 };
491 
492 static int __init ps3_system_bus_init(void)
493 {
494 	int result;
495 
496 	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
497 		return -ENODEV;
498 
499 	pr_debug(" -> %s:%d\n", __func__, __LINE__);
500 
501 	mutex_init(&usage_hack.mutex);
502 
503 	result = device_register(&ps3_system_bus);
504 	BUG_ON(result);
505 
506 	result = bus_register(&ps3_system_bus_type);
507 	BUG_ON(result);
508 
509 	pr_debug(" <- %s:%d\n", __func__, __LINE__);
510 	return result;
511 }
512 
513 core_initcall(ps3_system_bus_init);
514 
515 /* Allocates a contiguous real buffer and creates mappings over it.
516  * Returns the virtual address of the buffer and sets dma_handle
517  * to the dma address (mapping) of the first page.
518  */
519 static void * ps3_alloc_coherent(struct device *_dev, size_t size,
520 				 dma_addr_t *dma_handle, gfp_t flag,
521 				 unsigned long attrs)
522 {
523 	int result;
524 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
525 	unsigned long virt_addr;
526 
527 	flag &= ~(__GFP_DMA | __GFP_HIGHMEM);
528 	flag |= __GFP_ZERO;
529 
530 	virt_addr = __get_free_pages(flag, get_order(size));
531 
532 	if (!virt_addr) {
533 		pr_debug("%s:%d: get_free_pages failed\n", __func__, __LINE__);
534 		goto clean_none;
535 	}
536 
537 	result = ps3_dma_map(dev->d_region, virt_addr, size, dma_handle,
538 			     CBE_IOPTE_PP_W | CBE_IOPTE_PP_R |
539 			     CBE_IOPTE_SO_RW | CBE_IOPTE_M);
540 
541 	if (result) {
542 		pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
543 			__func__, __LINE__, result);
544 		BUG_ON("check region type");
545 		goto clean_alloc;
546 	}
547 
548 	return (void*)virt_addr;
549 
550 clean_alloc:
551 	free_pages(virt_addr, get_order(size));
552 clean_none:
553 	dma_handle = NULL;
554 	return NULL;
555 }
556 
557 static void ps3_free_coherent(struct device *_dev, size_t size, void *vaddr,
558 			      dma_addr_t dma_handle, unsigned long attrs)
559 {
560 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
561 
562 	ps3_dma_unmap(dev->d_region, dma_handle, size);
563 	free_pages((unsigned long)vaddr, get_order(size));
564 }
565 
566 /* Creates TCEs for a user provided buffer.  The user buffer must be
567  * contiguous real kernel storage (not vmalloc).  The address passed here
568  * comprises a page address and offset into that page. The dma_addr_t
569  * returned will point to the same byte within the page as was passed in.
570  */
571 
572 static dma_addr_t ps3_sb_map_page(struct device *_dev, struct page *page,
573 	unsigned long offset, size_t size, enum dma_data_direction direction,
574 	unsigned long attrs)
575 {
576 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
577 	int result;
578 	dma_addr_t bus_addr;
579 	void *ptr = page_address(page) + offset;
580 
581 	result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size,
582 			     &bus_addr,
583 			     CBE_IOPTE_PP_R | CBE_IOPTE_PP_W |
584 			     CBE_IOPTE_SO_RW | CBE_IOPTE_M);
585 
586 	if (result) {
587 		pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
588 			__func__, __LINE__, result);
589 	}
590 
591 	return bus_addr;
592 }
593 
594 static dma_addr_t ps3_ioc0_map_page(struct device *_dev, struct page *page,
595 				    unsigned long offset, size_t size,
596 				    enum dma_data_direction direction,
597 				    unsigned long attrs)
598 {
599 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
600 	int result;
601 	dma_addr_t bus_addr;
602 	u64 iopte_flag;
603 	void *ptr = page_address(page) + offset;
604 
605 	iopte_flag = CBE_IOPTE_M;
606 	switch (direction) {
607 	case DMA_BIDIRECTIONAL:
608 		iopte_flag |= CBE_IOPTE_PP_R | CBE_IOPTE_PP_W | CBE_IOPTE_SO_RW;
609 		break;
610 	case DMA_TO_DEVICE:
611 		iopte_flag |= CBE_IOPTE_PP_R | CBE_IOPTE_SO_R;
612 		break;
613 	case DMA_FROM_DEVICE:
614 		iopte_flag |= CBE_IOPTE_PP_W | CBE_IOPTE_SO_RW;
615 		break;
616 	default:
617 		/* not happned */
618 		BUG();
619 	};
620 	result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size,
621 			     &bus_addr, iopte_flag);
622 
623 	if (result) {
624 		pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
625 			__func__, __LINE__, result);
626 	}
627 	return bus_addr;
628 }
629 
630 static void ps3_unmap_page(struct device *_dev, dma_addr_t dma_addr,
631 	size_t size, enum dma_data_direction direction, unsigned long attrs)
632 {
633 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
634 	int result;
635 
636 	result = ps3_dma_unmap(dev->d_region, dma_addr, size);
637 
638 	if (result) {
639 		pr_debug("%s:%d: ps3_dma_unmap failed (%d)\n",
640 			__func__, __LINE__, result);
641 	}
642 }
643 
644 static int ps3_sb_map_sg(struct device *_dev, struct scatterlist *sgl,
645 	int nents, enum dma_data_direction direction, unsigned long attrs)
646 {
647 #if defined(CONFIG_PS3_DYNAMIC_DMA)
648 	BUG_ON("do");
649 	return -EPERM;
650 #else
651 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
652 	struct scatterlist *sg;
653 	int i;
654 
655 	for_each_sg(sgl, sg, nents, i) {
656 		int result = ps3_dma_map(dev->d_region, sg_phys(sg),
657 					sg->length, &sg->dma_address, 0);
658 
659 		if (result) {
660 			pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
661 				__func__, __LINE__, result);
662 			return -EINVAL;
663 		}
664 
665 		sg->dma_length = sg->length;
666 	}
667 
668 	return nents;
669 #endif
670 }
671 
672 static int ps3_ioc0_map_sg(struct device *_dev, struct scatterlist *sg,
673 			   int nents,
674 			   enum dma_data_direction direction,
675 			   unsigned long attrs)
676 {
677 	BUG();
678 	return 0;
679 }
680 
681 static void ps3_sb_unmap_sg(struct device *_dev, struct scatterlist *sg,
682 	int nents, enum dma_data_direction direction, unsigned long attrs)
683 {
684 #if defined(CONFIG_PS3_DYNAMIC_DMA)
685 	BUG_ON("do");
686 #endif
687 }
688 
689 static void ps3_ioc0_unmap_sg(struct device *_dev, struct scatterlist *sg,
690 			    int nents, enum dma_data_direction direction,
691 			    unsigned long attrs)
692 {
693 	BUG();
694 }
695 
696 static int ps3_dma_supported(struct device *_dev, u64 mask)
697 {
698 	return mask >= DMA_BIT_MASK(32);
699 }
700 
701 static u64 ps3_dma_get_required_mask(struct device *_dev)
702 {
703 	return DMA_BIT_MASK(32);
704 }
705 
706 static const struct dma_map_ops ps3_sb_dma_ops = {
707 	.alloc = ps3_alloc_coherent,
708 	.free = ps3_free_coherent,
709 	.map_sg = ps3_sb_map_sg,
710 	.unmap_sg = ps3_sb_unmap_sg,
711 	.dma_supported = ps3_dma_supported,
712 	.get_required_mask = ps3_dma_get_required_mask,
713 	.map_page = ps3_sb_map_page,
714 	.unmap_page = ps3_unmap_page,
715 };
716 
717 static const struct dma_map_ops ps3_ioc0_dma_ops = {
718 	.alloc = ps3_alloc_coherent,
719 	.free = ps3_free_coherent,
720 	.map_sg = ps3_ioc0_map_sg,
721 	.unmap_sg = ps3_ioc0_unmap_sg,
722 	.dma_supported = ps3_dma_supported,
723 	.get_required_mask = ps3_dma_get_required_mask,
724 	.map_page = ps3_ioc0_map_page,
725 	.unmap_page = ps3_unmap_page,
726 };
727 
728 /**
729  * ps3_system_bus_release_device - remove a device from the system bus
730  */
731 
732 static void ps3_system_bus_release_device(struct device *_dev)
733 {
734 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
735 	kfree(dev);
736 }
737 
738 /**
739  * ps3_system_bus_device_register - add a device to the system bus
740  *
741  * ps3_system_bus_device_register() expects the dev object to be allocated
742  * dynamically by the caller.  The system bus takes ownership of the dev
743  * object and frees the object in ps3_system_bus_release_device().
744  */
745 
746 int ps3_system_bus_device_register(struct ps3_system_bus_device *dev)
747 {
748 	int result;
749 	static unsigned int dev_ioc0_count;
750 	static unsigned int dev_sb_count;
751 	static unsigned int dev_vuart_count;
752 	static unsigned int dev_lpm_count;
753 
754 	if (!dev->core.parent)
755 		dev->core.parent = &ps3_system_bus;
756 	dev->core.bus = &ps3_system_bus_type;
757 	dev->core.release = ps3_system_bus_release_device;
758 
759 	switch (dev->dev_type) {
760 	case PS3_DEVICE_TYPE_IOC0:
761 		dev->core.dma_ops = &ps3_ioc0_dma_ops;
762 		dev_set_name(&dev->core, "ioc0_%02x", ++dev_ioc0_count);
763 		break;
764 	case PS3_DEVICE_TYPE_SB:
765 		dev->core.dma_ops = &ps3_sb_dma_ops;
766 		dev_set_name(&dev->core, "sb_%02x", ++dev_sb_count);
767 
768 		break;
769 	case PS3_DEVICE_TYPE_VUART:
770 		dev_set_name(&dev->core, "vuart_%02x", ++dev_vuart_count);
771 		break;
772 	case PS3_DEVICE_TYPE_LPM:
773 		dev_set_name(&dev->core, "lpm_%02x", ++dev_lpm_count);
774 		break;
775 	default:
776 		BUG();
777 	};
778 
779 	dev->core.of_node = NULL;
780 	set_dev_node(&dev->core, 0);
781 
782 	pr_debug("%s:%d add %s\n", __func__, __LINE__, dev_name(&dev->core));
783 
784 	result = device_register(&dev->core);
785 	return result;
786 }
787 
788 EXPORT_SYMBOL_GPL(ps3_system_bus_device_register);
789 
790 int ps3_system_bus_driver_register(struct ps3_system_bus_driver *drv)
791 {
792 	int result;
793 
794 	pr_debug(" -> %s:%d: %s\n", __func__, __LINE__, drv->core.name);
795 
796 	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
797 		return -ENODEV;
798 
799 	drv->core.bus = &ps3_system_bus_type;
800 
801 	result = driver_register(&drv->core);
802 	pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, drv->core.name);
803 	return result;
804 }
805 
806 EXPORT_SYMBOL_GPL(ps3_system_bus_driver_register);
807 
808 void ps3_system_bus_driver_unregister(struct ps3_system_bus_driver *drv)
809 {
810 	pr_debug(" -> %s:%d: %s\n", __func__, __LINE__, drv->core.name);
811 	driver_unregister(&drv->core);
812 	pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, drv->core.name);
813 }
814 
815 EXPORT_SYMBOL_GPL(ps3_system_bus_driver_unregister);
816