summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/rsi/rsi_91x_sdio_ops.c
blob: 612c211e21a153a370e80f1070a3399d450de71c (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
/**
 * Copyright (c) 2014 Redpine Signals Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

#include <linux/firmware.h>
#include <net/rsi_91x.h>
#include "rsi_sdio.h"
#include "rsi_common.h"

/**
 * rsi_sdio_master_access_msword() - This function sets the AHB master access
 *				     MS word in the SDIO slave registers.
 * @adapter: Pointer to the adapter structure.
 * @ms_word: ms word need to be initialized.
 *
 * Return: status: 0 on success, -1 on failure.
 */
int rsi_sdio_master_access_msword(struct rsi_hw *adapter, u16 ms_word)
{
	u8 byte;
	u8 function = 0;
	int status = 0;

	byte = (u8)(ms_word & 0x00FF);

	rsi_dbg(INIT_ZONE,
		"%s: MASTER_ACCESS_MSBYTE:0x%x\n", __func__, byte);

	status = rsi_sdio_write_register(adapter,
					 function,
					 SDIO_MASTER_ACCESS_MSBYTE,
					 &byte);
	if (status) {
		rsi_dbg(ERR_ZONE,
			"%s: fail to access MASTER_ACCESS_MSBYTE\n",
			__func__);
		return -1;
	}

	byte = (u8)(ms_word >> 8);

	rsi_dbg(INIT_ZONE, "%s:MASTER_ACCESS_LSBYTE:0x%x\n", __func__, byte);
	status = rsi_sdio_write_register(adapter,
					 function,
					 SDIO_MASTER_ACCESS_LSBYTE,
					 &byte);
	return status;
}

void rsi_sdio_rx_thread(struct rsi_common *common)
{
	struct rsi_hw *adapter = common->priv;
	struct rsi_91x_sdiodev *sdev = adapter->rsi_dev;
	struct sk_buff *skb;
	int status;

	do {
		rsi_wait_event(&sdev->rx_thread.event, EVENT_WAIT_FOREVER);
		rsi_reset_event(&sdev->rx_thread.event);

		while (true) {
			if (atomic_read(&sdev->rx_thread.thread_done))
				goto out;

			skb = skb_dequeue(&sdev->rx_q.head);
			if (!skb)
				break;
			if (sdev->rx_q.num_rx_pkts > 0)
				sdev->rx_q.num_rx_pkts--;
			status = rsi_read_pkt(common, skb->data, skb->len);
			if (status) {
				rsi_dbg(ERR_ZONE, "Failed to read the packet\n");
				dev_kfree_skb(skb);
				break;
			}
			dev_kfree_skb(skb);
		}
	} while (1);

out:
	rsi_dbg(INFO_ZONE, "%s: Terminated SDIO RX thread\n", __func__);
	skb_queue_purge(&sdev->rx_q.head);
	atomic_inc(&sdev->rx_thread.thread_done);
	complete_and_exit(&sdev->rx_thread.completion, 0);
}

/**
 * rsi_process_pkt() - This Function reads rx_blocks register and figures out
 *		       the size of the rx pkt.
 * @common: Pointer to the driver private structure.
 *
 * Return: 0 on success, -1 on failure.
 */
static int rsi_process_pkt(struct rsi_common *common)
{
	struct rsi_hw *adapter = common->priv;
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	u8 num_blks = 0;
	u32 rcv_pkt_len = 0;
	int status = 0;
	u8 value = 0;
	struct sk_buff *skb;

	if (dev->rx_q.num_rx_pkts >= RSI_MAX_RX_PKTS)
		return 0;

	num_blks = ((adapter->interrupt_status & 1) |
			((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1));

	if (!num_blks) {
		status = rsi_sdio_read_register(adapter,
						SDIO_RX_NUM_BLOCKS_REG,
						&value);
		if (status) {
			rsi_dbg(ERR_ZONE,
				"%s: Failed to read pkt length from the card:\n",
				__func__);
			return status;
		}
		num_blks = value & 0x1f;
	}

	if (dev->write_fail == 2)
		rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING));

	if (unlikely(!num_blks)) {
		dev->write_fail = 2;
		return -1;
	}

	rcv_pkt_len = (num_blks * 256);

	skb = dev_alloc_skb(rcv_pkt_len);
	if (!skb)
		return -ENOMEM;

	status = rsi_sdio_host_intf_read_pkt(adapter, skb->data, rcv_pkt_len);
	if (status) {
		rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
			__func__);
		dev_kfree_skb(skb);
		return status;
	}
	skb_put(skb, rcv_pkt_len);
	skb_queue_tail(&dev->rx_q.head, skb);
	dev->rx_q.num_rx_pkts++;

	rsi_set_event(&dev->rx_thread.event);

	return 0;
}

/**
 * rsi_init_sdio_slave_regs() - This function does the actual initialization
 *				of SDBUS slave registers.
 * @adapter: Pointer to the adapter structure.
 *
 * Return: status: 0 on success, -1 on failure.
 */
int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	u8 function = 0;
	u8 byte;
	int status = 0;

	if (dev->next_read_delay) {
		byte = dev->next_read_delay;
		status = rsi_sdio_write_register(adapter,
						 function,
						 SDIO_NXT_RD_DELAY2,
						 &byte);
		if (status) {
			rsi_dbg(ERR_ZONE,
				"%s: Failed to write SDIO_NXT_RD_DELAY2\n",
				__func__);
			return -1;
		}
	}

	if (dev->sdio_high_speed_enable) {
		rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
		byte = 0x3;

		status = rsi_sdio_write_register(adapter,
						 function,
						 SDIO_REG_HIGH_SPEED,
						 &byte);
		if (status) {
			rsi_dbg(ERR_ZONE,
				"%s: Failed to enable SDIO high speed\n",
				__func__);
			return -1;
		}
	}

	/* This tells SDIO FIFO when to start read to host */
	rsi_dbg(INIT_ZONE, "%s: Initialzing SDIO read start level\n", __func__);
	byte = 0x24;

	status = rsi_sdio_write_register(adapter,
					 function,
					 SDIO_READ_START_LVL,
					 &byte);
	if (status) {
		rsi_dbg(ERR_ZONE,
			"%s: Failed to write SDIO_READ_START_LVL\n", __func__);
		return -1;
	}

	rsi_dbg(INIT_ZONE, "%s: Initialzing FIFO ctrl registers\n", __func__);
	byte = (128 - 32);

	status = rsi_sdio_write_register(adapter,
					 function,
					 SDIO_READ_FIFO_CTL,
					 &byte);
	if (status) {
		rsi_dbg(ERR_ZONE,
			"%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
		return -1;
	}

	byte = 32;
	status = rsi_sdio_write_register(adapter,
					 function,
					 SDIO_WRITE_FIFO_CTL,
					 &byte);
	if (status) {
		rsi_dbg(ERR_ZONE,
			"%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
		return -1;
	}

	return 0;
}

/**
 * rsi_interrupt_handler() - This function read and process SDIO interrupts.
 * @adapter: Pointer to the adapter structure.
 *
 * Return: None.
 */
void rsi_interrupt_handler(struct rsi_hw *adapter)
{
	struct rsi_common *common = adapter->priv;
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	int status;
	enum sdio_interrupt_type isr_type;
	u8 isr_status = 0;
	u8 fw_status = 0;

	dev->rx_info.sdio_int_counter++;

	do {
		mutex_lock(&common->rx_lock);
		status = rsi_sdio_read_register(common->priv,
						RSI_FN1_INT_REGISTER,
						&isr_status);
		if (status) {
			rsi_dbg(ERR_ZONE,
				"%s: Failed to Read Intr Status Register\n",
				__func__);
			mutex_unlock(&common->rx_lock);
			return;
		}
		adapter->interrupt_status = isr_status;

		if (isr_status == 0) {
			rsi_set_event(&common->tx_thread.event);
			dev->rx_info.sdio_intr_status_zero++;
			mutex_unlock(&common->rx_lock);
			return;
		}

		rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
			__func__, isr_status, (1 << MSDU_PKT_PENDING),
			(1 << FW_ASSERT_IND));

		do {
			RSI_GET_SDIO_INTERRUPT_TYPE(isr_status, isr_type);

			switch (isr_type) {
			case BUFFER_AVAILABLE:
				status = rsi_sdio_check_buffer_status(adapter,
								      0);
				if (status < 0)
					rsi_dbg(ERR_ZONE,
						"%s: Failed to check buffer status\n",
						__func__);
				rsi_sdio_ack_intr(common->priv,
						  (1 << PKT_BUFF_AVAILABLE));
				rsi_set_event(&common->tx_thread.event);

				rsi_dbg(ISR_ZONE,
					"%s: ==> BUFFER_AVAILABLE <==\n",
					__func__);
				dev->buff_status_updated = true;
				break;

			case FIRMWARE_ASSERT_IND:
				rsi_dbg(ERR_ZONE,
					"%s: ==> FIRMWARE Assert <==\n",
					__func__);
				status = rsi_sdio_read_register(common->priv,
							SDIO_FW_STATUS_REG,
							&fw_status);
				if (status) {
					rsi_dbg(ERR_ZONE,
						"%s: Failed to read f/w reg\n",
						__func__);
				} else {
					rsi_dbg(ERR_ZONE,
						"%s: Firmware Status is 0x%x\n",
						__func__ , fw_status);
					rsi_sdio_ack_intr(common->priv,
							  (1 << FW_ASSERT_IND));
				}

				common->fsm_state = FSM_CARD_NOT_READY;
				break;

			case MSDU_PACKET_PENDING:
				rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
				dev->rx_info.total_sdio_msdu_pending_intr++;

				status = rsi_process_pkt(common);
				if (status) {
					rsi_dbg(ERR_ZONE,
						"%s: Failed to read pkt\n",
						__func__);
					mutex_unlock(&common->rx_lock);
					return;
				}
				break;
			default:
				rsi_sdio_ack_intr(common->priv, isr_status);
				dev->rx_info.total_sdio_unknown_intr++;
				isr_status = 0;
				rsi_dbg(ISR_ZONE,
					"Unknown Interrupt %x\n",
					isr_status);
				break;
			}
			isr_status ^= BIT(isr_type - 1);
		} while (isr_status);
		mutex_unlock(&common->rx_lock);
	} while (1);
}

/* This function is used to read buffer status register and
 * set relevant fields in rsi_91x_sdiodev struct.
 */
int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
{
	struct rsi_common *common = adapter->priv;
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
	u8 buf_status = 0;
	int status = 0;
	static int counter = 4;

	if (!dev->buff_status_updated && counter) {
		counter--;
		goto out;
	}

	dev->buff_status_updated = false;
	status = rsi_sdio_read_register(common->priv,
					RSI_DEVICE_BUFFER_STATUS_REGISTER,
					&buf_status);

	if (status) {
		rsi_dbg(ERR_ZONE,
			"%s: Failed to read status register\n", __func__);
		return -1;
	}

	if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
		if (!dev->rx_info.mgmt_buffer_full)
			dev->rx_info.mgmt_buf_full_counter++;
		dev->rx_info.mgmt_buffer_full = true;
	} else {
		dev->rx_info.mgmt_buffer_full = false;
	}

	if (buf_status & (BIT(PKT_BUFF_FULL))) {
		if (!dev->rx_info.buffer_full)
			dev->rx_info.buf_full_counter++;
		dev->rx_info.buffer_full = true;
	} else {
		dev->rx_info.buffer_full = false;
	}

	if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
		if (!dev->rx_info.semi_buffer_full)
			dev->rx_info.buf_semi_full_counter++;
		dev->rx_info.semi_buffer_full = true;
	} else {
		dev->rx_info.semi_buffer_full = false;
	}

	if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter)
		counter = 1;
	else
		counter = 4;

out:
	if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
		return QUEUE_FULL;

	if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
		return QUEUE_FULL;

	return QUEUE_NOT_FULL;
}

/**
 * rsi_sdio_determine_event_timeout() - This Function determines the event
 *					timeout duration.
 * @adapter: Pointer to the adapter structure.
 *
 * Return: timeout duration is returned.
 */
int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
{
	struct rsi_91x_sdiodev *dev =
		(struct rsi_91x_sdiodev *)adapter->rsi_dev;

	/* Once buffer full is seen, event timeout to occur every 2 msecs */
	if (dev->rx_info.buffer_full)
		return 2;

	return EVENT_WAIT_FOREVER;
}