system-bus.c revision 2a08ea69a3e448a5cc94e5da9eccc40cf13f9532 
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/module.h>
24#include <linux/dma-mapping.h>
25#include <linux/err.h>
26
27#include <asm/udbg.h>
28#include <asm/lv1call.h>
29#include <asm/firmware.h>
30
31#include "platform.h"
32
33#define dump_mmio_region(_a) _dump_mmio_region(_a, __func__, __LINE__)
34static void _dump_mmio_region(const struct ps3_mmio_region* r,
35	const char* func, int line)
36{
37	pr_debug("%s:%d: dev       %u:%u\n", func, line, r->did.bus_id,
38		r->did.dev_id);
39	pr_debug("%s:%d: bus_addr  %lxh\n", func, line, r->bus_addr);
40	pr_debug("%s:%d: len       %lxh\n", func, line, r->len);
41	pr_debug("%s:%d: lpar_addr %lxh\n", func, line, r->lpar_addr);
42}
43
44int ps3_mmio_region_create(struct ps3_mmio_region *r)
45{
46	int result;
47
48	result = lv1_map_device_mmio_region(r->did.bus_id, r->did.dev_id,
49		r->bus_addr, r->len, r->page_size, &r->lpar_addr);
50
51	if (result) {
52		pr_debug("%s:%d: lv1_map_device_mmio_region failed: %s\n",
53			__func__, __LINE__, ps3_result(result));
54		r->lpar_addr = 0;
55	}
56
57	dump_mmio_region(r);
58	return result;
59}
60
61int ps3_free_mmio_region(struct ps3_mmio_region *r)
62{
63	int result;
64
65	result = lv1_unmap_device_mmio_region(r->did.bus_id, r->did.dev_id,
66		r->lpar_addr);
67
68	if (result)
69		pr_debug("%s:%d: lv1_unmap_device_mmio_region failed: %s\n",
70			__func__, __LINE__, ps3_result(result));
71
72	r->lpar_addr = 0;
73	return result;
74}
75
76static int ps3_system_bus_match(struct device *_dev,
77	struct device_driver *_drv)
78{
79	int result;
80	struct ps3_system_bus_driver *drv = to_ps3_system_bus_driver(_drv);
81	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
82
83	result = dev->match_id == drv->match_id;
84
85	pr_info("%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__, __LINE__,
86		dev->match_id, dev->core.bus_id, drv->match_id, drv->core.name,
87		(result ? "match" : "miss"));
88	return result;
89}
90
91static int ps3_system_bus_probe(struct device *_dev)
92{
93	int result;
94	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
95	struct ps3_system_bus_driver *drv =
96		to_ps3_system_bus_driver(_dev->driver);
97
98	result = lv1_open_device(dev->did.bus_id, dev->did.dev_id, 0);
99
100	if (result) {
101		pr_debug("%s:%d: lv1_open_device failed (%d)\n",
102			__func__, __LINE__, result);
103		result = -EACCES;
104		goto clean_none;
105	}
106
107	if (dev->d_region->did.bus_id) {
108		result = ps3_dma_region_create(dev->d_region);
109
110		if (result) {
111			pr_debug("%s:%d: ps3_dma_region_create failed (%d)\n",
112				__func__, __LINE__, result);
113			BUG_ON("check region type");
114			result = -EINVAL;
115			goto clean_device;
116		}
117	}
118
119	BUG_ON(!drv);
120
121	if (drv->probe)
122		result = drv->probe(dev);
123	else
124		pr_info("%s:%d: %s no probe method\n", __func__, __LINE__,
125			dev->core.bus_id);
126
127	if (result) {
128		pr_debug("%s:%d: drv->probe failed\n", __func__, __LINE__);
129		goto clean_dma;
130	}
131
132	return result;
133
134clean_dma:
135	ps3_dma_region_free(dev->d_region);
136clean_device:
137	lv1_close_device(dev->did.bus_id, dev->did.dev_id);
138clean_none:
139	return result;
140}
141
142static int ps3_system_bus_remove(struct device *_dev)
143{
144	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
145	struct ps3_system_bus_driver *drv =
146		to_ps3_system_bus_driver(_dev->driver);
147
148	if (drv->remove)
149		drv->remove(dev);
150	else
151		pr_info("%s:%d: %s no remove method\n", __func__, __LINE__,
152			dev->core.bus_id);
153
154	ps3_dma_region_free(dev->d_region);
155	ps3_free_mmio_region(dev->m_region);
156	lv1_close_device(dev->did.bus_id, dev->did.dev_id);
157
158	return 0;
159}
160
161struct bus_type ps3_system_bus_type = {
162	.name = "ps3_system_bus",
163	.match = ps3_system_bus_match,
164	.probe = ps3_system_bus_probe,
165	.remove = ps3_system_bus_remove,
166};
167
168int __init ps3_system_bus_init(void)
169{
170	int result;
171
172	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
173		return 0;
174
175	result = bus_register(&ps3_system_bus_type);
176	BUG_ON(result);
177	return result;
178}
179
180core_initcall(ps3_system_bus_init);
181
182/* Allocates a contiguous real buffer and creates mappings over it.
183 * Returns the virtual address of the buffer and sets dma_handle
184 * to the dma address (mapping) of the first page.
185 */
186
187static void * ps3_alloc_coherent(struct device *_dev, size_t size,
188	dma_addr_t *dma_handle, gfp_t flag)
189{
190	int result;
191	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
192	unsigned long virt_addr;
193
194	BUG_ON(!dev->d_region->bus_addr);
195
196	flag &= ~(__GFP_DMA | __GFP_HIGHMEM);
197	flag |= __GFP_ZERO;
198
199	virt_addr = __get_free_pages(flag, get_order(size));
200
201	if (!virt_addr) {
202		pr_debug("%s:%d: get_free_pages failed\n", __func__, __LINE__);
203		goto clean_none;
204	}
205
206	result = ps3_dma_map(dev->d_region, virt_addr, size, dma_handle);
207
208	if (result) {
209		pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
210			__func__, __LINE__, result);
211		BUG_ON("check region type");
212		goto clean_alloc;
213	}
214
215	return (void*)virt_addr;
216
217clean_alloc:
218	free_pages(virt_addr, get_order(size));
219clean_none:
220	dma_handle = NULL;
221	return NULL;
222}
223
224static void ps3_free_coherent(struct device *_dev, size_t size, void *vaddr,
225	dma_addr_t dma_handle)
226{
227	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
228
229	ps3_dma_unmap(dev->d_region, dma_handle, size);
230	free_pages((unsigned long)vaddr, get_order(size));
231}
232
233/* Creates TCEs for a user provided buffer.  The user buffer must be
234 * contiguous real kernel storage (not vmalloc).  The address of the buffer
235 * passed here is the kernel (virtual) address of the buffer.  The buffer
236 * need not be page aligned, the dma_addr_t returned will point to the same
237 * byte within the page as vaddr.
238 */
239
240static dma_addr_t ps3_map_single(struct device *_dev, void *ptr, size_t size,
241	enum dma_data_direction direction)
242{
243	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
244	int result;
245	unsigned long bus_addr;
246
247	result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size,
248		&bus_addr);
249
250	if (result) {
251		pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
252			__func__, __LINE__, result);
253	}
254
255	return bus_addr;
256}
257
258static void ps3_unmap_single(struct device *_dev, dma_addr_t dma_addr,
259	size_t size, enum dma_data_direction direction)
260{
261	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
262	int result;
263
264	result = ps3_dma_unmap(dev->d_region, dma_addr, size);
265
266	if (result) {
267		pr_debug("%s:%d: ps3_dma_unmap failed (%d)\n",
268			__func__, __LINE__, result);
269	}
270}
271
272static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents,
273	enum dma_data_direction direction)
274{
275#if defined(CONFIG_PS3_DYNAMIC_DMA)
276	BUG_ON("do");
277#endif
278	return 0;
279}
280
281static void ps3_unmap_sg(struct device *_dev, struct scatterlist *sg,
282	int nents, enum dma_data_direction direction)
283{
284#if defined(CONFIG_PS3_DYNAMIC_DMA)
285	BUG_ON("do");
286#endif
287}
288
289static int ps3_dma_supported(struct device *_dev, u64 mask)
290{
291	return 1;
292}
293
294static struct dma_mapping_ops ps3_dma_ops = {
295	.alloc_coherent = ps3_alloc_coherent,
296	.free_coherent = ps3_free_coherent,
297	.map_single = ps3_map_single,
298	.unmap_single = ps3_unmap_single,
299	.map_sg = ps3_map_sg,
300	.unmap_sg = ps3_unmap_sg,
301	.dma_supported = ps3_dma_supported
302};
303
304/**
305 * ps3_system_bus_release_device - remove a device from the system bus
306 */
307
308static void ps3_system_bus_release_device(struct device *_dev)
309{
310	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
311	kfree(dev);
312}
313
314/**
315 * ps3_system_bus_device_register - add a device to the system bus
316 *
317 * ps3_system_bus_device_register() expects the dev object to be allocated
318 * dynamically by the caller.  The system bus takes ownership of the dev
319 * object and frees the object in ps3_system_bus_release_device().
320 */
321
322int ps3_system_bus_device_register(struct ps3_system_bus_device *dev)
323{
324	int result;
325	static unsigned int dev_count = 1;
326
327	dev->core.parent = NULL;
328	dev->core.bus = &ps3_system_bus_type;
329	dev->core.release = ps3_system_bus_release_device;
330
331	dev->core.archdata.of_node = NULL;
332	dev->core.archdata.dma_ops = &ps3_dma_ops;
333	dev->core.archdata.numa_node = 0;
334
335	snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "sb_%02x",
336		dev_count++);
337
338	pr_debug("%s:%d add %s\n", __func__, __LINE__, dev->core.bus_id);
339
340	result = device_register(&dev->core);
341	return result;
342}
343
344EXPORT_SYMBOL_GPL(ps3_system_bus_device_register);
345
346int ps3_system_bus_driver_register(struct ps3_system_bus_driver *drv)
347{
348	int result;
349
350	drv->core.bus = &ps3_system_bus_type;
351
352	result = driver_register(&drv->core);
353	return result;
354}
355
356EXPORT_SYMBOL_GPL(ps3_system_bus_driver_register);
357
358void ps3_system_bus_driver_unregister(struct ps3_system_bus_driver *drv)
359{
360	driver_unregister(&drv->core);
361}
362
363EXPORT_SYMBOL_GPL(ps3_system_bus_driver_unregister);
364