summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb/firewire/firedtv-fw.c
blob: 7a3de16fba0698e73bbd79df740efe4fe4e09630 (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
/*
 * FireDTV driver -- firewire I/O backend
 */

#include <linux/device.h>
#include <linux/errno.h>
#include <linux/firewire.h>
#include <linux/firewire-constants.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>

#include <asm/page.h>

#include <dvb_demux.h>

#include "firedtv.h"

static LIST_HEAD(node_list);
static DEFINE_SPINLOCK(node_list_lock);

static inline struct fw_device *device_of(struct firedtv *fdtv)
{
	return fw_device(fdtv->device->parent);
}

static int node_req(struct firedtv *fdtv, u64 addr, void *data, size_t len,
		    int tcode)
{
	struct fw_device *device = device_of(fdtv);
	int rcode, generation = device->generation;

	smp_rmb(); /* node_id vs. generation */

	rcode = fw_run_transaction(device->card, tcode, device->node_id,
			generation, device->max_speed, addr, data, len);

	return rcode != RCODE_COMPLETE ? -EIO : 0;
}

static int node_lock(struct firedtv *fdtv, u64 addr, void *data)
{
	return node_req(fdtv, addr, data, 8, TCODE_LOCK_COMPARE_SWAP);
}

static int node_read(struct firedtv *fdtv, u64 addr, void *data)
{
	return node_req(fdtv, addr, data, 4, TCODE_READ_QUADLET_REQUEST);
}

static int node_write(struct firedtv *fdtv, u64 addr, void *data, size_t len)
{
	return node_req(fdtv, addr, data, len, TCODE_WRITE_BLOCK_REQUEST);
}

#define ISO_HEADER_SIZE			4
#define CIP_HEADER_SIZE			8
#define MPEG2_TS_HEADER_SIZE		4
#define MPEG2_TS_SOURCE_PACKET_SIZE	(4 + 188)

#define MAX_PACKET_SIZE		1024  /* 776, rounded up to 2^n */
#define PACKETS_PER_PAGE	(PAGE_SIZE / MAX_PACKET_SIZE)
#define N_PACKETS		64    /* buffer size */
#define N_PAGES			DIV_ROUND_UP(N_PACKETS, PACKETS_PER_PAGE)
#define IRQ_INTERVAL		16

struct firedtv_receive_context {
	struct fw_iso_context *context;
	struct fw_iso_buffer buffer;
	int interrupt_packet;
	int current_packet;
	char *pages[N_PAGES];
};

static int queue_iso(struct firedtv_receive_context *ctx, int index)
{
	struct fw_iso_packet p;

	p.payload_length = MAX_PACKET_SIZE;
	p.interrupt = !(++ctx->interrupt_packet & (IRQ_INTERVAL - 1));
	p.skip = 0;
	p.header_length = ISO_HEADER_SIZE;

	return fw_iso_context_queue(ctx->context, &p, &ctx->buffer,
				    index * MAX_PACKET_SIZE);
}

static void handle_iso(struct fw_iso_context *context, u32 cycle,
		       size_t header_length, void *header, void *data)
{
	struct firedtv *fdtv = data;
	struct firedtv_receive_context *ctx = fdtv->backend_data;
	__be32 *h, *h_end;
	int length, err, i = ctx->current_packet;
	char *p, *p_end;

	for (h = header, h_end = h + header_length / 4; h < h_end; h++) {
		length = be32_to_cpup(h) >> 16;
		if (unlikely(length > MAX_PACKET_SIZE)) {
			dev_err(fdtv->device, "length = %d\n", length);
			length = MAX_PACKET_SIZE;
		}

		p = ctx->pages[i / PACKETS_PER_PAGE]
				+ (i % PACKETS_PER_PAGE) * MAX_PACKET_SIZE;
		p_end = p + length;

		for (p += CIP_HEADER_SIZE + MPEG2_TS_HEADER_SIZE; p < p_end;
		     p += MPEG2_TS_SOURCE_PACKET_SIZE)
			dvb_dmx_swfilter_packets(&fdtv->demux, p, 1);

		err = queue_iso(ctx, i);
		if (unlikely(err))
			dev_err(fdtv->device, "requeue failed\n");

		i = (i + 1) & (N_PACKETS - 1);
	}
	ctx->current_packet = i;
}

static int start_iso(struct firedtv *fdtv)
{
	struct firedtv_receive_context *ctx;
	struct fw_device *device = device_of(fdtv);
	int i, err;

	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	ctx->context = fw_iso_context_create(device->card,
			FW_ISO_CONTEXT_RECEIVE, fdtv->isochannel,
			device->max_speed, ISO_HEADER_SIZE, handle_iso, fdtv);
	if (IS_ERR(ctx->context)) {
		err = PTR_ERR(ctx->context);
		goto fail_free;
	}

	err = fw_iso_buffer_init(&ctx->buffer, device->card,
				 N_PAGES, DMA_FROM_DEVICE);
	if (err)
		goto fail_context_destroy;

	ctx->interrupt_packet = 0;
	ctx->current_packet = 0;

	for (i = 0; i < N_PAGES; i++)
		ctx->pages[i] = page_address(ctx->buffer.pages[i]);

	for (i = 0; i < N_PACKETS; i++) {
		err = queue_iso(ctx, i);
		if (err)
			goto fail;
	}

	err = fw_iso_context_start(ctx->context, -1, 0,
				   FW_ISO_CONTEXT_MATCH_ALL_TAGS);
	if (err)
		goto fail;

	fdtv->backend_data = ctx;

	return 0;
fail:
	fw_iso_buffer_destroy(&ctx->buffer, device->card);
fail_context_destroy:
	fw_iso_context_destroy(ctx->context);
fail_free:
	kfree(ctx);

	return err;
}

static void stop_iso(struct firedtv *fdtv)
{
	struct firedtv_receive_context *ctx = fdtv->backend_data;

	fw_iso_context_stop(ctx->context);
	fw_iso_buffer_destroy(&ctx->buffer, device_of(fdtv)->card);
	fw_iso_context_destroy(ctx->context);
	kfree(ctx);
}

static const struct firedtv_backend backend = {
	.lock		= node_lock,
	.read		= node_read,
	.write		= node_write,
	.start_iso	= start_iso,
	.stop_iso	= stop_iso,
};

static void handle_fcp(struct fw_card *card, struct fw_request *request,
		       int tcode, int destination, int source, int generation,
		       int speed, unsigned long long offset,
		       void *payload, size_t length, void *callback_data)
{
	struct firedtv *f, *fdtv = NULL;
	struct fw_device *device;
	unsigned long flags;
	int su;

	if (length < 2 || (((u8 *)payload)[0] & 0xf0) != 0)
		return;

	su = ((u8 *)payload)[1] & 0x7;

	spin_lock_irqsave(&node_list_lock, flags);
	list_for_each_entry(f, &node_list, list) {
		device = device_of(f);
		if (device->generation != generation)
			continue;

		smp_rmb(); /* node_id vs. generation */

		if (device->card == card &&
		    device->node_id == source &&
		    (f->subunit == su || (f->subunit == 0 && su == 0x7))) {
			fdtv = f;
			break;
		}
	}
	spin_unlock_irqrestore(&node_list_lock, flags);

	if (fdtv)
		avc_recv(fdtv, payload, length);
}

static struct fw_address_handler fcp_handler = {
	.length           = CSR_FCP_END - CSR_FCP_RESPONSE,
	.address_callback = handle_fcp,
};

static const struct fw_address_region fcp_region = {
	.start	= CSR_REGISTER_BASE + CSR_FCP_RESPONSE,
	.end	= CSR_REGISTER_BASE + CSR_FCP_END,
};

/* Adjust the template string if models with longer names appear. */
#define MAX_MODEL_NAME_LEN ((int)DIV_ROUND_UP(sizeof("FireDTV ????"), 4))

static size_t model_name(u32 *directory, __be32 *buffer)
{
	struct fw_csr_iterator ci;
	int i, length, key, value, last_key = 0;
	u32 *block = NULL;

	fw_csr_iterator_init(&ci, directory);
	while (fw_csr_iterator_next(&ci, &key, &value)) {
		if (last_key == CSR_MODEL &&
		    key == (CSR_DESCRIPTOR | CSR_LEAF))
			block = ci.p - 1 + value;
		last_key = key;
	}

	if (block == NULL)
		return 0;

	length = min((int)(block[0] >> 16) - 2, MAX_MODEL_NAME_LEN);
	if (length <= 0)
		return 0;

	/* fast-forward to text string */
	block += 3;

	for (i = 0; i < length; i++)
		buffer[i] = cpu_to_be32(block[i]);

	return length * 4;
}

static int node_probe(struct device *dev)
{
	struct firedtv *fdtv;
	__be32 name[MAX_MODEL_NAME_LEN];
	int name_len, err;

	name_len = model_name(fw_unit(dev)->directory, name);

	fdtv = fdtv_alloc(dev, &backend, (char *)name, name_len);
	if (!fdtv)
		return -ENOMEM;

	err = fdtv_register_rc(fdtv, dev);
	if (err)
		goto fail_free;

	spin_lock_irq(&node_list_lock);
	list_add_tail(&fdtv->list, &node_list);
	spin_unlock_irq(&node_list_lock);

	err = avc_identify_subunit(fdtv);
	if (err)
		goto fail;

	err = fdtv_dvb_register(fdtv);
	if (err)
		goto fail;

	avc_register_remote_control(fdtv);

	return 0;
fail:
	spin_lock_irq(&node_list_lock);
	list_del(&fdtv->list);
	spin_unlock_irq(&node_list_lock);
	fdtv_unregister_rc(fdtv);
fail_free:
	kfree(fdtv);

	return err;
}

static int node_remove(struct device *dev)
{
	struct firedtv *fdtv = dev_get_drvdata(dev);

	fdtv_dvb_unregister(fdtv);

	spin_lock_irq(&node_list_lock);
	list_del(&fdtv->list);
	spin_unlock_irq(&node_list_lock);

	fdtv_unregister_rc(fdtv);

	kfree(fdtv);
	return 0;
}

static void node_update(struct fw_unit *unit)
{
	struct firedtv *fdtv = dev_get_drvdata(&unit->device);

	if (fdtv->isochannel >= 0)
		cmp_establish_pp_connection(fdtv, fdtv->subunit,
					    fdtv->isochannel);
}

static struct fw_driver fdtv_driver = {
	.driver   = {
		.owner  = THIS_MODULE,
		.name   = "firedtv",
		.bus    = &fw_bus_type,
		.probe  = node_probe,
		.remove = node_remove,
	},
	.update   = node_update,
	.id_table = fdtv_id_table,
};

int __init fdtv_fw_init(void)
{
	int ret;

	ret = fw_core_add_address_handler(&fcp_handler, &fcp_region);
	if (ret < 0)
		return ret;

	return driver_register(&fdtv_driver.driver);
}

void fdtv_fw_exit(void)
{
	driver_unregister(&fdtv_driver.driver);
	fw_core_remove_address_handler(&fcp_handler);
}