summaryrefslogtreecommitdiffstats
path: root/drivers/net/wimax/i2400m/usb-fw.c
blob: 27ab233650d538c6aff52a7d015c14a99b36a6d9 (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
/*
 * Intel Wireless WiMAX Connection 2400m
 * Firmware uploader's USB specifics
 *
 *
 * Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * Intel Corporation <linux-wimax@intel.com>
 * Yanir Lubetkin <yanirx.lubetkin@intel.com>
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *  - Initial implementation
 *
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *  - bus generic/specific split
 *
 * THE PROCEDURE
 *
 * See fw.c for the generic description of this procedure.
 *
 * This file implements only the USB specifics. It boils down to how
 * to send a command and waiting for an acknowledgement from the
 * device.
 *
 * This code (and process) is single threaded. It assumes it is the
 * only thread poking around (guaranteed by fw.c).
 *
 * COMMAND EXECUTION
 *
 * A write URB is posted with the buffer to the bulk output endpoint.
 *
 * ACK RECEPTION
 *
 * We just post a URB to the notification endpoint and wait for
 * data. We repeat until we get all the data we expect (as indicated
 * by the call from the bus generic code).
 *
 * The data is not read from the bulk in endpoint for boot mode.
 *
 * ROADMAP
 *
 * i2400mu_bus_bm_cmd_send
 *   i2400m_bm_cmd_prepare...
 *   i2400mu_tx_bulk_out
 *
 * i2400mu_bus_bm_wait_for_ack
 *   i2400m_notif_submit
 */
#include <linux/usb.h>
#include <linux/gfp.h>
#include "i2400m-usb.h"


#define D_SUBMODULE fw
#include "usb-debug-levels.h"


/*
 * Synchronous write to the device
 *
 * Takes care of updating EDC counts and thus, handle device errors.
 */
static
ssize_t i2400mu_tx_bulk_out(struct i2400mu *i2400mu, void *buf, size_t buf_size)
{
	int result;
	struct device *dev = &i2400mu->usb_iface->dev;
	int len;
	struct usb_endpoint_descriptor *epd;
	int pipe, do_autopm = 1;

	result = usb_autopm_get_interface(i2400mu->usb_iface);
	if (result < 0) {
		dev_err(dev, "BM-CMD: can't get autopm: %d\n", result);
		do_autopm = 0;
	}
	epd = usb_get_epd(i2400mu->usb_iface, i2400mu->endpoint_cfg.bulk_out);
	pipe = usb_sndbulkpipe(i2400mu->usb_dev, epd->bEndpointAddress);
retry:
	result = usb_bulk_msg(i2400mu->usb_dev, pipe, buf, buf_size, &len, 200);
	switch (result) {
	case 0:
		if (len != buf_size) {
			dev_err(dev, "BM-CMD: short write (%u B vs %zu "
				"expected)\n", len, buf_size);
			result = -EIO;
			break;
		}
		result = len;
		break;
	case -EPIPE:
		/*
		 * Stall -- maybe the device is choking with our
		 * requests. Clear it and give it some time. If they
		 * happen to often, it might be another symptom, so we
		 * reset.
		 *
		 * No error handling for usb_clear_halt(0; if it
		 * works, the retry works; if it fails, this switch
		 * does the error handling for us.
		 */
		if (edc_inc(&i2400mu->urb_edc,
			    10 * EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
			dev_err(dev, "BM-CMD: too many stalls in "
				"URB; resetting device\n");
			usb_queue_reset_device(i2400mu->usb_iface);
		} else {
			usb_clear_halt(i2400mu->usb_dev, pipe);
			msleep(10);	/* give the device some time */
			goto retry;
		}
		fallthrough;
	case -EINVAL:			/* while removing driver */
	case -ENODEV:			/* dev disconnect ... */
	case -ENOENT:			/* just ignore it */
	case -ESHUTDOWN:		/* and exit */
	case -ECONNRESET:
		result = -ESHUTDOWN;
		break;
	case -ETIMEDOUT:			/* bah... */
		break;
	default:				/* any other? */
		if (edc_inc(&i2400mu->urb_edc,
			    EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
				dev_err(dev, "BM-CMD: maximum errors in "
					"URB exceeded; resetting device\n");
				usb_queue_reset_device(i2400mu->usb_iface);
				result = -ENODEV;
				break;
		}
		dev_err(dev, "BM-CMD: URB error %d, retrying\n",
			result);
		goto retry;
	}
	if (do_autopm)
		usb_autopm_put_interface(i2400mu->usb_iface);
	return result;
}


/*
 * Send a boot-mode command over the bulk-out pipe
 *
 * Command can be a raw command, which requires no preparation (and
 * which might not even be following the command format). Checks that
 * the right amount of data was transferred.
 *
 * To satisfy USB requirements (no onstack, vmalloc or in data segment
 * buffers), we copy the command to i2400m->bm_cmd_buf and send it from
 * there.
 *
 * @flags: pass thru from i2400m_bm_cmd()
 * @return: cmd_size if ok, < 0 errno code on error.
 */
ssize_t i2400mu_bus_bm_cmd_send(struct i2400m *i2400m,
				const struct i2400m_bootrom_header *_cmd,
				size_t cmd_size, int flags)
{
	ssize_t result;
	struct device *dev = i2400m_dev(i2400m);
	struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
	int opcode = _cmd == NULL ? -1 : i2400m_brh_get_opcode(_cmd);
	struct i2400m_bootrom_header *cmd;
	size_t cmd_size_a = ALIGN(cmd_size, 16);	/* USB restriction */

	d_fnstart(8, dev, "(i2400m %p cmd %p size %zu)\n",
		  i2400m, _cmd, cmd_size);
	result = -E2BIG;
	if (cmd_size > I2400M_BM_CMD_BUF_SIZE)
		goto error_too_big;
	if (_cmd != i2400m->bm_cmd_buf)
		memmove(i2400m->bm_cmd_buf, _cmd, cmd_size);
	cmd = i2400m->bm_cmd_buf;
	if (cmd_size_a > cmd_size)			/* Zero pad space */
		memset(i2400m->bm_cmd_buf + cmd_size, 0, cmd_size_a - cmd_size);
	if ((flags & I2400M_BM_CMD_RAW) == 0) {
		if (WARN_ON(i2400m_brh_get_response_required(cmd) == 0))
			dev_warn(dev, "SW BUG: response_required == 0\n");
		i2400m_bm_cmd_prepare(cmd);
	}
	result = i2400mu_tx_bulk_out(i2400mu, i2400m->bm_cmd_buf, cmd_size);
	if (result < 0) {
		dev_err(dev, "boot-mode cmd %d: cannot send: %zd\n",
			opcode, result);
		goto error_cmd_send;
	}
	if (result != cmd_size) {		/* all was transferred? */
		dev_err(dev, "boot-mode cmd %d: incomplete transfer "
			"(%zd vs %zu submitted)\n",  opcode, result, cmd_size);
		result = -EIO;
		goto error_cmd_size;
	}
error_cmd_size:
error_cmd_send:
error_too_big:
	d_fnend(8, dev, "(i2400m %p cmd %p size %zu) = %zd\n",
		i2400m, _cmd, cmd_size, result);
	return result;
}


static
void __i2400mu_bm_notif_cb(struct urb *urb)
{
	complete(urb->context);
}


/*
 * submit a read to the notification endpoint
 *
 * @i2400m: device descriptor
 * @urb: urb to use
 * @completion: completion variable to complete when done
 *
 * Data is always read to i2400m->bm_ack_buf
 */
static
int i2400mu_notif_submit(struct i2400mu *i2400mu, struct urb *urb,
			 struct completion *completion)
{
	struct i2400m *i2400m = &i2400mu->i2400m;
	struct usb_endpoint_descriptor *epd;
	int pipe;

	epd = usb_get_epd(i2400mu->usb_iface,
			  i2400mu->endpoint_cfg.notification);
	pipe = usb_rcvintpipe(i2400mu->usb_dev, epd->bEndpointAddress);
	usb_fill_int_urb(urb, i2400mu->usb_dev, pipe,
			 i2400m->bm_ack_buf, I2400M_BM_ACK_BUF_SIZE,
			 __i2400mu_bm_notif_cb, completion,
			 epd->bInterval);
	return usb_submit_urb(urb, GFP_KERNEL);
}


/*
 * Read an ack from  the notification endpoint
 *
 * @i2400m:
 * @_ack: pointer to where to store the read data
 * @ack_size: how many bytes we should read
 *
 * Returns: < 0 errno code on error; otherwise, amount of received bytes.
 *
 * Submits a notification read, appends the read data to the given ack
 * buffer and then repeats (until @ack_size bytes have been
 * received).
 */
ssize_t i2400mu_bus_bm_wait_for_ack(struct i2400m *i2400m,
				    struct i2400m_bootrom_header *_ack,
				    size_t ack_size)
{
	ssize_t result = -ENOMEM;
	struct device *dev = i2400m_dev(i2400m);
	struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
	struct urb notif_urb;
	void *ack = _ack;
	size_t offset, len;
	long val;
	int do_autopm = 1;
	DECLARE_COMPLETION_ONSTACK(notif_completion);

	d_fnstart(8, dev, "(i2400m %p ack %p size %zu)\n",
		  i2400m, ack, ack_size);
	BUG_ON(_ack == i2400m->bm_ack_buf);
	result = usb_autopm_get_interface(i2400mu->usb_iface);
	if (result < 0) {
		dev_err(dev, "BM-ACK: can't get autopm: %d\n", (int) result);
		do_autopm = 0;
	}
	usb_init_urb(&notif_urb);	/* ready notifications */
	usb_get_urb(&notif_urb);
	offset = 0;
	while (offset < ack_size) {
		init_completion(&notif_completion);
		result = i2400mu_notif_submit(i2400mu, &notif_urb,
					      &notif_completion);
		if (result < 0)
			goto error_notif_urb_submit;
		val = wait_for_completion_interruptible_timeout(
			&notif_completion, HZ);
		if (val == 0) {
			result = -ETIMEDOUT;
			usb_kill_urb(&notif_urb);	/* Timedout */
			goto error_notif_wait;
		}
		if (val == -ERESTARTSYS) {
			result = -EINTR;		/* Interrupted */
			usb_kill_urb(&notif_urb);
			goto error_notif_wait;
		}
		result = notif_urb.status;		/* How was the ack? */
		switch (result) {
		case 0:
			break;
		case -EINVAL:			/* while removing driver */
		case -ENODEV:			/* dev disconnect ... */
		case -ENOENT:			/* just ignore it */
		case -ESHUTDOWN:		/* and exit */
		case -ECONNRESET:
			result = -ESHUTDOWN;
			goto error_dev_gone;
		default:				/* any other? */
			usb_kill_urb(&notif_urb);	/* Timedout */
			if (edc_inc(&i2400mu->urb_edc,
				    EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME))
				goto error_exceeded;
			dev_err(dev, "BM-ACK: URB error %d, "
				"retrying\n", notif_urb.status);
			continue;	/* retry */
		}
		if (notif_urb.actual_length == 0) {
			d_printf(6, dev, "ZLP received, retrying\n");
			continue;
		}
		/* Got data, append it to the buffer */
		len = min(ack_size - offset, (size_t) notif_urb.actual_length);
		memcpy(ack + offset, i2400m->bm_ack_buf, len);
		offset += len;
	}
	result = offset;
error_notif_urb_submit:
error_notif_wait:
error_dev_gone:
out:
	if (do_autopm)
		usb_autopm_put_interface(i2400mu->usb_iface);
	d_fnend(8, dev, "(i2400m %p ack %p size %zu) = %ld\n",
		i2400m, ack, ack_size, (long) result);
	usb_put_urb(&notif_urb);
	return result;

error_exceeded:
	dev_err(dev, "bm: maximum errors in notification URB exceeded; "
		"resetting device\n");
	usb_queue_reset_device(i2400mu->usb_iface);
	goto out;
}