summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwmc3200wifi/sdio.c
blob: 1acea37f39f807b1112fa0dac5bc258abb551e08 (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
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
/*
 * Intel Wireless Multicomm 3200 WiFi driver
 *
 * Copyright (C) 2009 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 <ilw@linux.intel.com>
 * Samuel Ortiz <samuel.ortiz@intel.com>
 * Zhu Yi <yi.zhu@intel.com>
 *
 */

/*
 * This is the SDIO bus specific hooks for iwm.
 * It also is the module's entry point.
 *
 * Interesting code paths:
 * iwm_sdio_probe() (Called by an SDIO bus scan)
 *  -> iwm_if_alloc() (netdev.c)
 *      -> iwm_wdev_alloc() (cfg80211.c, allocates and register our wiphy)
 *          -> wiphy_new()
 *          -> wiphy_register()
 *      -> alloc_netdev_mq()
 *      -> register_netdev()
 *
 * iwm_sdio_remove()
 *  -> iwm_if_free() (netdev.c)
 *      -> unregister_netdev()
 *      -> iwm_wdev_free() (cfg80211.c)
 *          -> wiphy_unregister()
 *          -> wiphy_free()
 *
 * iwm_sdio_isr() (called in process context from the SDIO core code)
 *  -> queue_work(.., isr_worker)
 *      -- [async] --> iwm_sdio_isr_worker()
 *                      -> iwm_rx_handle()
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/debugfs.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sdio_func.h>

#include "iwm.h"
#include "debug.h"
#include "bus.h"
#include "sdio.h"

static void iwm_sdio_isr_worker(struct work_struct *work)
{
	struct iwm_sdio_priv *hw;
	struct iwm_priv *iwm;
	struct iwm_rx_info *rx_info;
	struct sk_buff *skb;
	u8 *rx_buf;
	unsigned long rx_size;

	hw = container_of(work, struct iwm_sdio_priv, isr_worker);
	iwm = hw_to_iwm(hw);

	while (!skb_queue_empty(&iwm->rx_list)) {
		skb = skb_dequeue(&iwm->rx_list);
		rx_info = skb_to_rx_info(skb);
		rx_size = rx_info->rx_size;
		rx_buf = skb->data;

		IWM_HEXDUMP(iwm, DBG, SDIO, "RX: ", rx_buf, rx_size);
		if (iwm_rx_handle(iwm, rx_buf, rx_size) < 0)
			IWM_WARN(iwm, "RX error\n");

		kfree_skb(skb);
	}
}

static void iwm_sdio_isr(struct sdio_func *func)
{
	struct iwm_priv *iwm;
	struct iwm_sdio_priv *hw;
	struct iwm_rx_info *rx_info;
	struct sk_buff *skb;
	unsigned long buf_size, read_size;
	int ret;
	u8 val;

	hw = sdio_get_drvdata(func);
	iwm = hw_to_iwm(hw);

	buf_size = hw->blk_size;

	/* We're checking the status */
	val = sdio_readb(func, IWM_SDIO_INTR_STATUS_ADDR, &ret);
	if (val == 0 || ret < 0) {
		IWM_ERR(iwm, "Wrong INTR_STATUS\n");
		return;
	}

	/* See if we have free buffers */
	if (skb_queue_len(&iwm->rx_list) > IWM_RX_LIST_SIZE) {
		IWM_ERR(iwm, "No buffer for more Rx frames\n");
		return;
	}

	/* We first read the transaction size */
	read_size = sdio_readb(func, IWM_SDIO_INTR_GET_SIZE_ADDR + 1, &ret);
	read_size = read_size << 8;

	if (ret < 0) {
		IWM_ERR(iwm, "Couldn't read the xfer size\n");
		return;
	}

	/* We need to clear the INT register */
	sdio_writeb(func, 1, IWM_SDIO_INTR_CLEAR_ADDR, &ret);
	if (ret < 0) {
		IWM_ERR(iwm, "Couldn't clear the INT register\n");
		return;
	}

	while (buf_size < read_size)
		buf_size <<= 1;

	skb = dev_alloc_skb(buf_size);
	if (!skb) {
		IWM_ERR(iwm, "Couldn't alloc RX skb\n");
		return;
	}
	rx_info = skb_to_rx_info(skb);
	rx_info->rx_size = read_size;
	rx_info->rx_buf_size = buf_size;

	/* Now we can read the actual buffer */
	ret = sdio_memcpy_fromio(func, skb_put(skb, read_size),
				 IWM_SDIO_DATA_ADDR, read_size);

	/* The skb is put on a driver's specific Rx SKB list */
	skb_queue_tail(&iwm->rx_list, skb);

	/* We can now schedule the actual worker */
	queue_work(hw->isr_wq, &hw->isr_worker);
}

static void iwm_sdio_rx_free(struct iwm_sdio_priv *hw)
{
	struct iwm_priv *iwm = hw_to_iwm(hw);

	flush_workqueue(hw->isr_wq);

	skb_queue_purge(&iwm->rx_list);
}

/* Bus ops */
static int if_sdio_enable(struct iwm_priv *iwm)
{
	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
	int ret;

	sdio_claim_host(hw->func);

	ret = sdio_enable_func(hw->func);
	if (ret) {
		IWM_ERR(iwm, "Couldn't enable the device: is TOP driver "
			"loaded and functional?\n");
		goto release_host;
	}

	iwm_reset(iwm);

	ret = sdio_claim_irq(hw->func, iwm_sdio_isr);
	if (ret) {
		IWM_ERR(iwm, "Failed to claim irq: %d\n", ret);
		goto release_host;
	}

	sdio_writeb(hw->func, 1, IWM_SDIO_INTR_ENABLE_ADDR, &ret);
	if (ret < 0) {
		IWM_ERR(iwm, "Couldn't enable INTR: %d\n", ret);
		goto release_irq;
	}

	sdio_release_host(hw->func);

	IWM_DBG_SDIO(iwm, INFO, "IWM SDIO enable\n");

	return 0;

 release_irq:
	sdio_release_irq(hw->func);
 release_host:
	sdio_release_host(hw->func);

	return ret;
}

static int if_sdio_disable(struct iwm_priv *iwm)
{
	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
	int ret;

	sdio_claim_host(hw->func);
	sdio_writeb(hw->func, 0, IWM_SDIO_INTR_ENABLE_ADDR, &ret);
	if (ret < 0)
		IWM_WARN(iwm, "Couldn't disable INTR: %d\n", ret);

	sdio_release_irq(hw->func);
	sdio_disable_func(hw->func);
	sdio_release_host(hw->func);

	iwm_sdio_rx_free(hw);

	iwm_reset(iwm);

	IWM_DBG_SDIO(iwm, INFO, "IWM SDIO disable\n");

	return 0;
}

static int if_sdio_send_chunk(struct iwm_priv *iwm, u8 *buf, int count)
{
	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
	int aligned_count = ALIGN(count, hw->blk_size);
	int ret;

	if ((unsigned long)buf & 0x3) {
		IWM_ERR(iwm, "buf <%p> is not dword aligned\n", buf);
		/* TODO: Is this a hardware limitation? use get_unligned */
		return -EINVAL;
	}

	sdio_claim_host(hw->func);
	ret = sdio_memcpy_toio(hw->func, IWM_SDIO_DATA_ADDR, buf,
			       aligned_count);
	sdio_release_host(hw->func);

	return ret;
}

/* debugfs hooks */
static int iwm_debugfs_sdio_open(struct inode *inode, struct file *filp)
{
	filp->private_data = inode->i_private;
	return 0;
}

static ssize_t iwm_debugfs_sdio_read(struct file *filp, char __user *buffer,
				     size_t count, loff_t *ppos)
{
	struct iwm_priv *iwm = filp->private_data;
	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);
	char *buf;
	u8 cccr;
	int buf_len = 4096, ret;
	size_t len = 0;

	if (*ppos != 0)
		return 0;
	if (count < sizeof(buf))
		return -ENOSPC;

	buf = kzalloc(buf_len, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	sdio_claim_host(hw->func);

	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_IOEx, &ret);
	if (ret) {
		IWM_ERR(iwm, "Could not read SDIO_CCCR_IOEx\n");
		goto err;
	}
	len += snprintf(buf + len, buf_len - len, "CCCR_IOEx:  0x%x\n", cccr);

	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_IORx, &ret);
	if (ret) {
		IWM_ERR(iwm, "Could not read SDIO_CCCR_IORx\n");
		goto err;
	}
	len += snprintf(buf + len, buf_len - len, "CCCR_IORx:  0x%x\n", cccr);


	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_IENx, &ret);
	if (ret) {
		IWM_ERR(iwm, "Could not read SDIO_CCCR_IENx\n");
		goto err;
	}
	len += snprintf(buf + len, buf_len - len, "CCCR_IENx:  0x%x\n", cccr);


	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_INTx, &ret);
	if (ret) {
		IWM_ERR(iwm, "Could not read SDIO_CCCR_INTx\n");
		goto err;
	}
	len += snprintf(buf + len, buf_len - len, "CCCR_INTx:  0x%x\n", cccr);


	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_ABORT, &ret);
	if (ret) {
		IWM_ERR(iwm, "Could not read SDIO_CCCR_ABORTx\n");
		goto err;
	}
	len += snprintf(buf + len, buf_len - len, "CCCR_ABORT: 0x%x\n", cccr);

	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_IF, &ret);
	if (ret) {
		IWM_ERR(iwm, "Could not read SDIO_CCCR_IF\n");
		goto err;
	}
	len += snprintf(buf + len, buf_len - len, "CCCR_IF:    0x%x\n", cccr);


	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_CAPS, &ret);
	if (ret) {
		IWM_ERR(iwm, "Could not read SDIO_CCCR_CAPS\n");
		goto err;
	}
	len += snprintf(buf + len, buf_len - len, "CCCR_CAPS:  0x%x\n", cccr);

	cccr =  sdio_f0_readb(hw->func, SDIO_CCCR_CIS, &ret);
	if (ret) {
		IWM_ERR(iwm, "Could not read SDIO_CCCR_CIS\n");
		goto err;
	}
	len += snprintf(buf + len, buf_len - len, "CCCR_CIS:   0x%x\n", cccr);

	ret = simple_read_from_buffer(buffer, len, ppos, buf, buf_len);
err:
	sdio_release_host(hw->func);

	kfree(buf);

	return ret;
}

static const struct file_operations iwm_debugfs_sdio_fops = {
	.owner =	THIS_MODULE,
	.open =		iwm_debugfs_sdio_open,
	.read =		iwm_debugfs_sdio_read,
};

static void if_sdio_debugfs_init(struct iwm_priv *iwm, struct dentry *parent_dir)
{
	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);

	hw->cccr_dentry = debugfs_create_file("cccr", 0200,
					      parent_dir, iwm,
					      &iwm_debugfs_sdio_fops);
}

static void if_sdio_debugfs_exit(struct iwm_priv *iwm)
{
	struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm);

	debugfs_remove(hw->cccr_dentry);
}

static struct iwm_if_ops if_sdio_ops = {
	.enable = if_sdio_enable,
	.disable = if_sdio_disable,
	.send_chunk = if_sdio_send_chunk,
	.debugfs_init = if_sdio_debugfs_init,
	.debugfs_exit = if_sdio_debugfs_exit,
	.umac_name = "iwmc3200wifi-umac-sdio.bin",
	.calib_lmac_name = "iwmc3200wifi-calib-sdio.bin",
	.lmac_name = "iwmc3200wifi-lmac-sdio.bin",
};
MODULE_FIRMWARE("iwmc3200wifi-umac-sdio.bin");
MODULE_FIRMWARE("iwmc3200wifi-calib-sdio.bin");
MODULE_FIRMWARE("iwmc3200wifi-lmac-sdio.bin");

static int iwm_sdio_probe(struct sdio_func *func,
			  const struct sdio_device_id *id)
{
	struct iwm_priv *iwm;
	struct iwm_sdio_priv *hw;
	struct device *dev = &func->dev;
	int ret;

	/* check if TOP has already initialized the card */
	sdio_claim_host(func);
	ret = sdio_enable_func(func);
	if (ret) {
		dev_err(dev, "wait for TOP to enable the device\n");
		sdio_release_host(func);
		return ret;
	}

	ret = sdio_set_block_size(func, IWM_SDIO_BLK_SIZE);

	sdio_disable_func(func);
	sdio_release_host(func);

	if (ret < 0) {
		dev_err(dev, "Failed to set block size: %d\n", ret);
		return ret;
	}

	iwm = iwm_if_alloc(sizeof(struct iwm_sdio_priv), dev, &if_sdio_ops);
	if (IS_ERR(iwm)) {
		dev_err(dev, "allocate SDIO interface failed\n");
		return PTR_ERR(iwm);
	}

	hw = iwm_private(iwm);
	hw->iwm = iwm;

	iwm_debugfs_init(iwm);

	sdio_set_drvdata(func, hw);

	hw->func = func;
	hw->blk_size = IWM_SDIO_BLK_SIZE;

	hw->isr_wq = create_singlethread_workqueue(KBUILD_MODNAME "_sdio");
	if (!hw->isr_wq) {
		ret = -ENOMEM;
		goto debugfs_exit;
	}

	INIT_WORK(&hw->isr_worker, iwm_sdio_isr_worker);

	ret = iwm_if_add(iwm);
	if (ret) {
		dev_err(dev, "add SDIO interface failed\n");
		goto destroy_wq;
	}

	dev_info(dev, "IWM SDIO probe\n");

	return 0;

 destroy_wq:
	destroy_workqueue(hw->isr_wq);
 debugfs_exit:
	iwm_debugfs_exit(iwm);
	iwm_if_free(iwm);
	return ret;
}

static void iwm_sdio_remove(struct sdio_func *func)
{
	struct iwm_sdio_priv *hw = sdio_get_drvdata(func);
	struct iwm_priv *iwm = hw_to_iwm(hw);
	struct device *dev = &func->dev;

	iwm_if_remove(iwm);
	destroy_workqueue(hw->isr_wq);
	iwm_debugfs_exit(iwm);
	iwm_if_free(iwm);

	sdio_set_drvdata(func, NULL);

	dev_info(dev, "IWM SDIO remove\n");

	return;
}

static const struct sdio_device_id iwm_sdio_ids[] = {
	/* Global/AGN SKU */
	{ SDIO_DEVICE(SDIO_VENDOR_ID_INTEL, 0x1403) },
	/* BGN SKU */
	{ SDIO_DEVICE(SDIO_VENDOR_ID_INTEL, 0x1408) },
	{ /* end: all zeroes */	},
};
MODULE_DEVICE_TABLE(sdio, iwm_sdio_ids);

static struct sdio_driver iwm_sdio_driver = {
	.name		= "iwm_sdio",
	.id_table	= iwm_sdio_ids,
	.probe		= iwm_sdio_probe,
	.remove		= iwm_sdio_remove,
};

static int __init iwm_sdio_init_module(void)
{
	return sdio_register_driver(&iwm_sdio_driver);
}

static void __exit iwm_sdio_exit_module(void)
{
	sdio_unregister_driver(&iwm_sdio_driver);
}

module_init(iwm_sdio_init_module);
module_exit(iwm_sdio_exit_module);

MODULE_LICENSE("GPL");
MODULE_AUTHOR(IWM_COPYRIGHT " " IWM_AUTHOR);