aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/ps3/system-bus.c
blob: 3c48cce98a5c0bba2ff7a063702ac7d49330d949 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
/*
 *  PS3 system bus driver.
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 Sony Corp.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>

#include <asm/udbg.h>
#include <asm/lv1call.h>
#include <asm/firmware.h>

#include "platform.h"

#define dump_mmio_region(_a) _dump_mmio_region(_a, __func__, __LINE__)
static void _dump_mmio_region(const struct ps3_mmio_region* r,
	const char* func, int line)
{
	pr_debug("%s:%d: dev       %u:%u\n", func, line, r->did.bus_id,
		r->did.dev_id);
	pr_debug("%s:%d: bus_addr  %lxh\n", func, line, r->bus_addr);
	pr_debug("%s:%d: len       %lxh\n", func, line, r->len);
	pr_debug("%s:%d: lpar_addr %lxh\n", func, line, r->lpar_addr);
}

int ps3_mmio_region_create(struct ps3_mmio_region *r)
{
	int result;

	result = lv1_map_device_mmio_region(r->did.bus_id, r->did.dev_id,
		r->bus_addr, r->len, r->page_size, &r->lpar_addr);

	if (result) {
		pr_debug("%s:%d: lv1_map_device_mmio_region failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		r->lpar_addr = 0;
	}

	dump_mmio_region(r);
	return result;
}
EXPORT_SYMBOL_GPL(ps3_mmio_region_create);

int ps3_free_mmio_region(struct ps3_mmio_region *r)
{
	int result;

	result = lv1_unmap_device_mmio_region(r->did.bus_id, r->did.dev_id,
		r->lpar_addr);

	if (result)
		pr_debug("%s:%d: lv1_unmap_device_mmio_region failed: %s\n",
			__func__, __LINE__, ps3_result(result));

	r->lpar_addr = 0;
	return result;
}
EXPORT_SYMBOL_GPL(ps3_free_mmio_region);

static int ps3_system_bus_match(struct device *_dev,
	struct device_driver *_drv)
{
	int result;
	struct ps3_system_bus_driver *drv = to_ps3_system_bus_driver(_drv);
	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);

	result = dev->match_id == drv->match_id;

	pr_info("%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__, __LINE__,
		dev->match_id, dev->core.bus_id, drv->match_id, drv->core.name,
		(result ? "match" : "miss"));
	return result;
}

static int ps3_system_bus_probe(struct device *_dev)
{
	int result;
	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
	struct ps3_system_bus_driver *drv =
		to_ps3_system_bus_driver(_dev->driver);

	result = lv1_open_device(dev->did.bus_id, dev->did.dev_id, 0);

	if (result) {
		pr_debug("%s:%d: lv1_open_device failed (%d)\n",
			__func__, __LINE__, result);
		result = -EACCES;
		goto clean_none;
	}

	if (dev->d_region->did.bus_id) {
		result = ps3_dma_region_create(dev->d_region);

		if (result) {
			pr_debug("%s:%d: ps3_dma_region_create failed (%d)\n",
				__func__, __LINE__, result);
			BUG_ON("check region type");
			result = -EINVAL;
			goto clean_device;
		}
	}

	BUG_ON(!drv);

	if (drv->probe)
		result = drv->probe(dev);
	else
		pr_info("%s:%d: %s no probe method\n", __func__, __LINE__,
			dev->core.bus_id);

	if (result) {
		pr_debug("%s:%d: drv->probe failed\n", __func__, __LINE__);
		goto clean_dma;
	}

	return result;

clean_dma:
	ps3_dma_region_free(dev->d_region);
clean_device:
	lv1_close_device(dev->did.bus_id, dev->did.dev_id);
clean_none:
	return result;
}

static int ps3_system_bus_remove(struct device *_dev)
{
	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
	struct ps3_system_bus_driver *drv =
		to_ps3_system_bus_driver(_dev->driver);

	if (drv->remove)
		drv->remove(dev);
	else
		pr_info("%s:%d: %s no remove method\n", __func__, __LINE__,
			dev->core.bus_id);

	ps3_dma_region_free(dev->d_region);
	ps3_free_mmio_region(dev->m_region);
	lv1_close_device(dev->did.bus_id, dev->did.dev_id);

	return 0;
}

struct bus_type ps3_system_bus_type = {
	.name = "ps3_system_bus",
	.match = ps3_system_bus_match,
	.probe = ps3_system_bus_probe,
	.remove = ps3_system_bus_remove,
};

int __init ps3_system_bus_init(void)
{
	int result;

	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
		return -ENODEV;

	result = bus_register(&ps3_system_bus_type);
	BUG_ON(result);
	return result;
}

core_initcall(ps3_system_bus_init);

/* Allocates a contiguous real buffer and creates mappings over it.
 * Returns the virtual address of the buffer and sets dma_handle
 * to the dma address (mapping) of the first page.
 */

static void * ps3_alloc_coherent(struct device *_dev, size_t size,
	dma_addr_t *dma_handle, gfp_t flag)
{
	int result;
	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
	unsigned long virt_addr;

	BUG_ON(!dev->d_region->bus_addr);

	flag &= ~(__GFP_DMA | __GFP_HIGHMEM);
	flag |= __GFP_ZERO;

	virt_addr = __get_free_pages(flag, get_order(size));

	if (!virt_addr) {
		pr_debug("%s:%d: get_free_pages failed\n", __func__, __LINE__);
		goto clean_none;
	}

	result = ps3_dma_map(dev->d_region, virt_addr, size, dma_handle);

	if (result) {
		pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
			__func__, __LINE__, result);
		BUG_ON("check region type");
		goto clean_alloc;
	}

	return (void*)virt_addr;

clean_alloc:
	free_pages(virt_addr, get_order(size));
clean_none:
	dma_handle = NULL;
	return NULL;
}

static void ps3_free_coherent(struct device *_dev, size_t size, void *vaddr,
	dma_addr_t dma_handle)
{
	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);

	ps3_dma_unmap(dev->d_region, dma_handle, size);
	free_pages((unsigned long)vaddr, get_order(size));
}

/* Creates TCEs for a user provided buffer.  The user buffer must be
 * contiguous real kernel storage (not vmalloc).  The address of the buffer
 * passed here is the kernel (virtual) address of the buffer.  The buffer
 * need not be page aligned, the dma_addr_t returned will point to the same
 * byte within the page as vaddr.
 */

static dma_addr_t ps3_map_single(struct device *_dev, void *ptr, size_t size,
	enum dma_data_direction direction)
{
	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
	int result;
	unsigned long bus_addr;

	result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size,
		&bus_addr);

	if (result) {
		pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
			__func__, __LINE__, result);
	}

	return bus_addr;
}

static void ps3_unmap_single(struct device *_dev, dma_addr_t dma_addr,
	size_t size, enum dma_data_direction direction)
{
	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
	int result;

	result = ps3_dma_unmap(dev->d_region, dma_addr, size);

	if (result) {
		pr_debug("%s:%d: ps3_dma_unmap failed (%d)\n",
			__func__, __LINE__, result);
	}
}

static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents,
	enum dma_data_direction direction)
{
	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
	int i;

#if defined(CONFIG_PS3_DYNAMIC_DMA)
	BUG_ON("do");
	return -EPERM;
#else
	for (i = 0; i < nents; i++, sg++) {
		int result = ps3_dma_map(dev->d_region,
			page_to_phys(sg->page) + sg->offset, sg->length,
			&sg->dma_address);

		if (result) {
			pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
				__func__, __LINE__, result);
			return -EINVAL;
		}

		sg->dma_length = sg->length;
	}

	return nents;
#endif
}

static void ps3_unmap_sg(struct device *_dev, struct scatterlist *sg,
	int nents, enum dma_data_direction direction)
{
#if defined(CONFIG_PS3_DYNAMIC_DMA)
	BUG_ON("do");
#endif
}

static int ps3_dma_supported(struct device *_dev, u64 mask)
{
	return mask >= DMA_32BIT_MASK;
}

static struct dma_mapping_ops ps3_dma_ops = {
	.alloc_coherent = ps3_alloc_coherent,
	.free_coherent = ps3_free_coherent,
	.map_single = ps3_map_single,
	.unmap_single = ps3_unmap_single,
	.map_sg = ps3_map_sg,
	.unmap_sg = ps3_unmap_sg,
	.dma_supported = ps3_dma_supported
};

/**
 * ps3_system_bus_release_device - remove a device from the system bus
 */

static void ps3_system_bus_release_device(struct device *_dev)
{
	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
	kfree(dev);
}

/**
 * ps3_system_bus_device_register - add a device to the system bus
 *
 * ps3_system_bus_device_register() expects the dev object to be allocated
 * dynamically by the caller.  The system bus takes ownership of the dev
 * object and frees the object in ps3_system_bus_release_device().
 */

int ps3_system_bus_device_register(struct ps3_system_bus_device *dev)
{
	int result;
	static unsigned int dev_count = 1;

	dev->core.parent = NULL;
	dev->core.bus = &ps3_system_bus_type;
	dev->core.release = ps3_system_bus_release_device;

	dev->core.archdata.of_node = NULL;
	dev->core.archdata.dma_ops = &ps3_dma_ops;
	dev->core.archdata.numa_node = 0;

	snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "sb_%02x",
		dev_count++);

	pr_debug("%s:%d add %s\n", __func__, __LINE__, dev->core.bus_id);

	result = device_register(&dev->core);
	return result;
}

EXPORT_SYMBOL_GPL(ps3_system_bus_device_register);

int ps3_system_bus_driver_register(struct ps3_system_bus_driver *drv)
{
	int result;

	drv->core.bus = &ps3_system_bus_type;

	result = driver_register(&drv->core);
	return result;
}

EXPORT_SYMBOL_GPL(ps3_system_bus_driver_register);

void ps3_system_bus_driver_unregister(struct ps3_system_bus_driver *drv)
{
	driver_unregister(&drv->core);
}

EXPORT_SYMBOL_GPL(ps3_system_bus_driver_unregister);