summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/intel/iwlwifi/iwl-io.c
blob: 2ac20d0a30eb654d07de933610215c133b00d6cc (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
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2003-2014, 2018-2020 Intel Corporation
 * Copyright (C) 2015-2016 Intel Deutschland GmbH
 */
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/export.h>

#include "iwl-drv.h"
#include "iwl-io.h"
#include "iwl-csr.h"
#include "iwl-debug.h"
#include "iwl-prph.h"
#include "iwl-fh.h"

void iwl_write8(struct iwl_trans *trans, u32 ofs, u8 val)
{
	trace_iwlwifi_dev_iowrite8(trans->dev, ofs, val);
	iwl_trans_write8(trans, ofs, val);
}
IWL_EXPORT_SYMBOL(iwl_write8);

void iwl_write32(struct iwl_trans *trans, u32 ofs, u32 val)
{
	trace_iwlwifi_dev_iowrite32(trans->dev, ofs, val);
	iwl_trans_write32(trans, ofs, val);
}
IWL_EXPORT_SYMBOL(iwl_write32);

void iwl_write64(struct iwl_trans *trans, u64 ofs, u64 val)
{
	trace_iwlwifi_dev_iowrite64(trans->dev, ofs, val);
	iwl_trans_write32(trans, ofs, lower_32_bits(val));
	iwl_trans_write32(trans, ofs + 4, upper_32_bits(val));
}
IWL_EXPORT_SYMBOL(iwl_write64);

u32 iwl_read32(struct iwl_trans *trans, u32 ofs)
{
	u32 val = iwl_trans_read32(trans, ofs);

	trace_iwlwifi_dev_ioread32(trans->dev, ofs, val);
	return val;
}
IWL_EXPORT_SYMBOL(iwl_read32);

#define IWL_POLL_INTERVAL 10	/* microseconds */

int iwl_poll_bit(struct iwl_trans *trans, u32 addr,
		 u32 bits, u32 mask, int timeout)
{
	int t = 0;

	do {
		if ((iwl_read32(trans, addr) & mask) == (bits & mask))
			return t;
		udelay(IWL_POLL_INTERVAL);
		t += IWL_POLL_INTERVAL;
	} while (t < timeout);

	return -ETIMEDOUT;
}
IWL_EXPORT_SYMBOL(iwl_poll_bit);

u32 iwl_read_direct32(struct iwl_trans *trans, u32 reg)
{
	u32 value = 0x5a5a5a5a;
	unsigned long flags;
	if (iwl_trans_grab_nic_access(trans, &flags)) {
		value = iwl_read32(trans, reg);
		iwl_trans_release_nic_access(trans, &flags);
	}

	return value;
}
IWL_EXPORT_SYMBOL(iwl_read_direct32);

void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value)
{
	unsigned long flags;

	if (iwl_trans_grab_nic_access(trans, &flags)) {
		iwl_write32(trans, reg, value);
		iwl_trans_release_nic_access(trans, &flags);
	}
}
IWL_EXPORT_SYMBOL(iwl_write_direct32);

void iwl_write_direct64(struct iwl_trans *trans, u64 reg, u64 value)
{
	unsigned long flags;

	if (iwl_trans_grab_nic_access(trans, &flags)) {
		iwl_write64(trans, reg, value);
		iwl_trans_release_nic_access(trans, &flags);
	}
}
IWL_EXPORT_SYMBOL(iwl_write_direct64);

int iwl_poll_direct_bit(struct iwl_trans *trans, u32 addr, u32 mask,
			int timeout)
{
	int t = 0;

	do {
		if ((iwl_read_direct32(trans, addr) & mask) == mask)
			return t;
		udelay(IWL_POLL_INTERVAL);
		t += IWL_POLL_INTERVAL;
	} while (t < timeout);

	return -ETIMEDOUT;
}
IWL_EXPORT_SYMBOL(iwl_poll_direct_bit);

u32 iwl_read_prph_no_grab(struct iwl_trans *trans, u32 ofs)
{
	u32 val = iwl_trans_read_prph(trans, ofs);
	trace_iwlwifi_dev_ioread_prph32(trans->dev, ofs, val);
	return val;
}
IWL_EXPORT_SYMBOL(iwl_read_prph_no_grab);

void iwl_write_prph_no_grab(struct iwl_trans *trans, u32 ofs, u32 val)
{
	trace_iwlwifi_dev_iowrite_prph32(trans->dev, ofs, val);
	iwl_trans_write_prph(trans, ofs, val);
}
IWL_EXPORT_SYMBOL(iwl_write_prph_no_grab);

void iwl_write_prph64_no_grab(struct iwl_trans *trans, u64 ofs, u64 val)
{
	trace_iwlwifi_dev_iowrite_prph64(trans->dev, ofs, val);
	iwl_write_prph_no_grab(trans, ofs, val & 0xffffffff);
	iwl_write_prph_no_grab(trans, ofs + 4, val >> 32);
}
IWL_EXPORT_SYMBOL(iwl_write_prph64_no_grab);

u32 iwl_read_prph(struct iwl_trans *trans, u32 ofs)
{
	unsigned long flags;
	u32 val = 0x5a5a5a5a;

	if (iwl_trans_grab_nic_access(trans, &flags)) {
		val = iwl_read_prph_no_grab(trans, ofs);
		iwl_trans_release_nic_access(trans, &flags);
	}
	return val;
}
IWL_EXPORT_SYMBOL(iwl_read_prph);

void iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
{
	unsigned long flags;

	if (iwl_trans_grab_nic_access(trans, &flags)) {
		iwl_write_prph_no_grab(trans, ofs, val);
		iwl_trans_release_nic_access(trans, &flags);
	}
}
IWL_EXPORT_SYMBOL(iwl_write_prph);

int iwl_poll_prph_bit(struct iwl_trans *trans, u32 addr,
		      u32 bits, u32 mask, int timeout)
{
	int t = 0;

	do {
		if ((iwl_read_prph(trans, addr) & mask) == (bits & mask))
			return t;
		udelay(IWL_POLL_INTERVAL);
		t += IWL_POLL_INTERVAL;
	} while (t < timeout);

	return -ETIMEDOUT;
}

void iwl_set_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
{
	unsigned long flags;

	if (iwl_trans_grab_nic_access(trans, &flags)) {
		iwl_write_prph_no_grab(trans, ofs,
				       iwl_read_prph_no_grab(trans, ofs) |
				       mask);
		iwl_trans_release_nic_access(trans, &flags);
	}
}
IWL_EXPORT_SYMBOL(iwl_set_bits_prph);

void iwl_set_bits_mask_prph(struct iwl_trans *trans, u32 ofs,
			    u32 bits, u32 mask)
{
	unsigned long flags;

	if (iwl_trans_grab_nic_access(trans, &flags)) {
		iwl_write_prph_no_grab(trans, ofs,
				       (iwl_read_prph_no_grab(trans, ofs) &
					mask) | bits);
		iwl_trans_release_nic_access(trans, &flags);
	}
}
IWL_EXPORT_SYMBOL(iwl_set_bits_mask_prph);

void iwl_clear_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
{
	unsigned long flags;
	u32 val;

	if (iwl_trans_grab_nic_access(trans, &flags)) {
		val = iwl_read_prph_no_grab(trans, ofs);
		iwl_write_prph_no_grab(trans, ofs, (val & ~mask));
		iwl_trans_release_nic_access(trans, &flags);
	}
}
IWL_EXPORT_SYMBOL(iwl_clear_bits_prph);

void iwl_force_nmi(struct iwl_trans *trans)
{
	if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_9000)
		iwl_write_prph(trans, DEVICE_SET_NMI_REG,
			       DEVICE_SET_NMI_VAL_DRV);
	else if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_AX210)
		iwl_write_umac_prph(trans, UREG_NIC_SET_NMI_DRIVER,
				UREG_NIC_SET_NMI_DRIVER_NMI_FROM_DRIVER);
	else
		iwl_write_umac_prph(trans, UREG_DOORBELL_TO_ISR6,
				    UREG_DOORBELL_TO_ISR6_NMI_BIT);
}
IWL_EXPORT_SYMBOL(iwl_force_nmi);

static const char *get_rfh_string(int cmd)
{
#define IWL_CMD(x) case x: return #x
#define IWL_CMD_MQ(arg, reg, q) { if (arg == reg(q)) return #reg; }

	int i;

	for (i = 0; i < IWL_MAX_RX_HW_QUEUES; i++) {
		IWL_CMD_MQ(cmd, RFH_Q_FRBDCB_BA_LSB, i);
		IWL_CMD_MQ(cmd, RFH_Q_FRBDCB_WIDX, i);
		IWL_CMD_MQ(cmd, RFH_Q_FRBDCB_RIDX, i);
		IWL_CMD_MQ(cmd, RFH_Q_URBD_STTS_WPTR_LSB, i);
	}

	switch (cmd) {
	IWL_CMD(RFH_RXF_DMA_CFG);
	IWL_CMD(RFH_GEN_CFG);
	IWL_CMD(RFH_GEN_STATUS);
	IWL_CMD(FH_TSSR_TX_STATUS_REG);
	IWL_CMD(FH_TSSR_TX_ERROR_REG);
	default:
		return "UNKNOWN";
	}
#undef IWL_CMD_MQ
}

struct reg {
	u32 addr;
	bool is64;
};

static int iwl_dump_rfh(struct iwl_trans *trans, char **buf)
{
	int i, q;
	int num_q = trans->num_rx_queues;
	static const u32 rfh_tbl[] = {
		RFH_RXF_DMA_CFG,
		RFH_GEN_CFG,
		RFH_GEN_STATUS,
		FH_TSSR_TX_STATUS_REG,
		FH_TSSR_TX_ERROR_REG,
	};
	static const struct reg rfh_mq_tbl[] = {
		{ RFH_Q0_FRBDCB_BA_LSB, true },
		{ RFH_Q0_FRBDCB_WIDX, false },
		{ RFH_Q0_FRBDCB_RIDX, false },
		{ RFH_Q0_URBD_STTS_WPTR_LSB, true },
	};

#ifdef CONFIG_IWLWIFI_DEBUGFS
	if (buf) {
		int pos = 0;
		/*
		 * Register (up to 34 for name + 8 blank/q for MQ): 40 chars
		 * Colon + space: 2 characters
		 * 0X%08x: 10 characters
		 * New line: 1 character
		 * Total of 53 characters
		 */
		size_t bufsz = ARRAY_SIZE(rfh_tbl) * 53 +
			       ARRAY_SIZE(rfh_mq_tbl) * 53 * num_q + 40;

		*buf = kmalloc(bufsz, GFP_KERNEL);
		if (!*buf)
			return -ENOMEM;

		pos += scnprintf(*buf + pos, bufsz - pos,
				"RFH register values:\n");

		for (i = 0; i < ARRAY_SIZE(rfh_tbl); i++)
			pos += scnprintf(*buf + pos, bufsz - pos,
				"%40s: 0X%08x\n",
				get_rfh_string(rfh_tbl[i]),
				iwl_read_prph(trans, rfh_tbl[i]));

		for (i = 0; i < ARRAY_SIZE(rfh_mq_tbl); i++)
			for (q = 0; q < num_q; q++) {
				u32 addr = rfh_mq_tbl[i].addr;

				addr += q * (rfh_mq_tbl[i].is64 ? 8 : 4);
				pos += scnprintf(*buf + pos, bufsz - pos,
					"%34s(q %2d): 0X%08x\n",
					get_rfh_string(addr), q,
					iwl_read_prph(trans, addr));
			}

		return pos;
	}
#endif

	IWL_ERR(trans, "RFH register values:\n");
	for (i = 0; i < ARRAY_SIZE(rfh_tbl); i++)
		IWL_ERR(trans, "  %34s: 0X%08x\n",
			get_rfh_string(rfh_tbl[i]),
			iwl_read_prph(trans, rfh_tbl[i]));

	for (i = 0; i < ARRAY_SIZE(rfh_mq_tbl); i++)
		for (q = 0; q < num_q; q++) {
			u32 addr = rfh_mq_tbl[i].addr;

			addr += q * (rfh_mq_tbl[i].is64 ? 8 : 4);
			IWL_ERR(trans, "  %34s(q %d): 0X%08x\n",
				get_rfh_string(addr), q,
				iwl_read_prph(trans, addr));
		}

	return 0;
}

static const char *get_fh_string(int cmd)
{
	switch (cmd) {
	IWL_CMD(FH_RSCSR_CHNL0_STTS_WPTR_REG);
	IWL_CMD(FH_RSCSR_CHNL0_RBDCB_BASE_REG);
	IWL_CMD(FH_RSCSR_CHNL0_WPTR);
	IWL_CMD(FH_MEM_RCSR_CHNL0_CONFIG_REG);
	IWL_CMD(FH_MEM_RSSR_SHARED_CTRL_REG);
	IWL_CMD(FH_MEM_RSSR_RX_STATUS_REG);
	IWL_CMD(FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV);
	IWL_CMD(FH_TSSR_TX_STATUS_REG);
	IWL_CMD(FH_TSSR_TX_ERROR_REG);
	default:
		return "UNKNOWN";
	}
#undef IWL_CMD
}

int iwl_dump_fh(struct iwl_trans *trans, char **buf)
{
	int i;
	static const u32 fh_tbl[] = {
		FH_RSCSR_CHNL0_STTS_WPTR_REG,
		FH_RSCSR_CHNL0_RBDCB_BASE_REG,
		FH_RSCSR_CHNL0_WPTR,
		FH_MEM_RCSR_CHNL0_CONFIG_REG,
		FH_MEM_RSSR_SHARED_CTRL_REG,
		FH_MEM_RSSR_RX_STATUS_REG,
		FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV,
		FH_TSSR_TX_STATUS_REG,
		FH_TSSR_TX_ERROR_REG
	};

	if (trans->trans_cfg->mq_rx_supported)
		return iwl_dump_rfh(trans, buf);

#ifdef CONFIG_IWLWIFI_DEBUGFS
	if (buf) {
		int pos = 0;
		size_t bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;

		*buf = kmalloc(bufsz, GFP_KERNEL);
		if (!*buf)
			return -ENOMEM;

		pos += scnprintf(*buf + pos, bufsz - pos,
				"FH register values:\n");

		for (i = 0; i < ARRAY_SIZE(fh_tbl); i++)
			pos += scnprintf(*buf + pos, bufsz - pos,
				"  %34s: 0X%08x\n",
				get_fh_string(fh_tbl[i]),
				iwl_read_direct32(trans, fh_tbl[i]));

		return pos;
	}
#endif

	IWL_ERR(trans, "FH register values:\n");
	for (i = 0; i <  ARRAY_SIZE(fh_tbl); i++)
		IWL_ERR(trans, "  %34s: 0X%08x\n",
			get_fh_string(fh_tbl[i]),
			iwl_read_direct32(trans, fh_tbl[i]));

	return 0;
}

int iwl_finish_nic_init(struct iwl_trans *trans,
			const struct iwl_cfg_trans_params *cfg_trans)
{
	int err;

	if (cfg_trans->bisr_workaround) {
		/* ensure the TOP FSM isn't still in previous reset */
		mdelay(2);
	}

	/*
	 * Set "initialization complete" bit to move adapter from
	 * D0U* --> D0A* (powered-up active) state.
	 */
	iwl_set_bit(trans, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);

	if (cfg_trans->device_family == IWL_DEVICE_FAMILY_8000)
		udelay(2);

	/*
	 * Wait for clock stabilization; once stabilized, access to
	 * device-internal resources is supported, e.g. iwl_write_prph()
	 * and accesses to uCode SRAM.
	 */
	err = iwl_poll_bit(trans, CSR_GP_CNTRL,
			   CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
			   CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
			   25000);
	if (err < 0)
		IWL_DEBUG_INFO(trans, "Failed to wake NIC\n");

	if (cfg_trans->bisr_workaround) {
		/* ensure BISR shift has finished */
		udelay(200);
	}

	return err < 0 ? err : 0;
}
IWL_EXPORT_SYMBOL(iwl_finish_nic_init);