1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2003-2014, 2018-2021 Intel Corporation
4  * Copyright (C) 2015-2016 Intel Deutschland GmbH
5  */
6 #include <linux/delay.h>
7 #include <linux/device.h>
8 #include <linux/export.h>
9 
10 #include "iwl-drv.h"
11 #include "iwl-io.h"
12 #include "iwl-csr.h"
13 #include "iwl-debug.h"
14 #include "iwl-prph.h"
15 #include "iwl-fh.h"
16 
iwl_write8(struct iwl_trans * trans,u32 ofs,u8 val)17 void iwl_write8(struct iwl_trans *trans, u32 ofs, u8 val)
18 {
19 	trace_iwlwifi_dev_iowrite8(trans->dev, ofs, val);
20 	iwl_trans_write8(trans, ofs, val);
21 }
22 IWL_EXPORT_SYMBOL(iwl_write8);
23 
iwl_write32(struct iwl_trans * trans,u32 ofs,u32 val)24 void iwl_write32(struct iwl_trans *trans, u32 ofs, u32 val)
25 {
26 	trace_iwlwifi_dev_iowrite32(trans->dev, ofs, val);
27 	iwl_trans_write32(trans, ofs, val);
28 }
29 IWL_EXPORT_SYMBOL(iwl_write32);
30 
iwl_write64(struct iwl_trans * trans,u64 ofs,u64 val)31 void iwl_write64(struct iwl_trans *trans, u64 ofs, u64 val)
32 {
33 	trace_iwlwifi_dev_iowrite64(trans->dev, ofs, val);
34 	iwl_trans_write32(trans, ofs, lower_32_bits(val));
35 	iwl_trans_write32(trans, ofs + 4, upper_32_bits(val));
36 }
37 IWL_EXPORT_SYMBOL(iwl_write64);
38 
iwl_read32(struct iwl_trans * trans,u32 ofs)39 u32 iwl_read32(struct iwl_trans *trans, u32 ofs)
40 {
41 	u32 val = iwl_trans_read32(trans, ofs);
42 
43 	trace_iwlwifi_dev_ioread32(trans->dev, ofs, val);
44 	return val;
45 }
46 IWL_EXPORT_SYMBOL(iwl_read32);
47 
48 #define IWL_POLL_INTERVAL 10	/* microseconds */
49 
iwl_poll_bit(struct iwl_trans * trans,u32 addr,u32 bits,u32 mask,int timeout)50 int iwl_poll_bit(struct iwl_trans *trans, u32 addr,
51 		 u32 bits, u32 mask, int timeout)
52 {
53 	int t = 0;
54 
55 	do {
56 		if ((iwl_read32(trans, addr) & mask) == (bits & mask))
57 			return t;
58 		udelay(IWL_POLL_INTERVAL);
59 		t += IWL_POLL_INTERVAL;
60 	} while (t < timeout);
61 
62 	return -ETIMEDOUT;
63 }
64 IWL_EXPORT_SYMBOL(iwl_poll_bit);
65 
iwl_read_direct32(struct iwl_trans * trans,u32 reg)66 u32 iwl_read_direct32(struct iwl_trans *trans, u32 reg)
67 {
68 	if (iwl_trans_grab_nic_access(trans)) {
69 		u32 value = iwl_read32(trans, reg);
70 
71 		iwl_trans_release_nic_access(trans);
72 		return value;
73 	}
74 
75 	return 0x5a5a5a5a;
76 }
77 IWL_EXPORT_SYMBOL(iwl_read_direct32);
78 
iwl_write_direct32(struct iwl_trans * trans,u32 reg,u32 value)79 void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value)
80 {
81 	if (iwl_trans_grab_nic_access(trans)) {
82 		iwl_write32(trans, reg, value);
83 		iwl_trans_release_nic_access(trans);
84 	}
85 }
86 IWL_EXPORT_SYMBOL(iwl_write_direct32);
87 
iwl_write_direct64(struct iwl_trans * trans,u64 reg,u64 value)88 void iwl_write_direct64(struct iwl_trans *trans, u64 reg, u64 value)
89 {
90 	if (iwl_trans_grab_nic_access(trans)) {
91 		iwl_write64(trans, reg, value);
92 		iwl_trans_release_nic_access(trans);
93 	}
94 }
95 IWL_EXPORT_SYMBOL(iwl_write_direct64);
96 
iwl_poll_direct_bit(struct iwl_trans * trans,u32 addr,u32 mask,int timeout)97 int iwl_poll_direct_bit(struct iwl_trans *trans, u32 addr, u32 mask,
98 			int timeout)
99 {
100 	int t = 0;
101 
102 	do {
103 		if ((iwl_read_direct32(trans, addr) & mask) == mask)
104 			return t;
105 		udelay(IWL_POLL_INTERVAL);
106 		t += IWL_POLL_INTERVAL;
107 	} while (t < timeout);
108 
109 	return -ETIMEDOUT;
110 }
111 IWL_EXPORT_SYMBOL(iwl_poll_direct_bit);
112 
iwl_read_prph_no_grab(struct iwl_trans * trans,u32 ofs)113 u32 iwl_read_prph_no_grab(struct iwl_trans *trans, u32 ofs)
114 {
115 	u32 val = iwl_trans_read_prph(trans, ofs);
116 	trace_iwlwifi_dev_ioread_prph32(trans->dev, ofs, val);
117 	return val;
118 }
119 IWL_EXPORT_SYMBOL(iwl_read_prph_no_grab);
120 
iwl_write_prph_no_grab(struct iwl_trans * trans,u32 ofs,u32 val)121 void iwl_write_prph_no_grab(struct iwl_trans *trans, u32 ofs, u32 val)
122 {
123 	trace_iwlwifi_dev_iowrite_prph32(trans->dev, ofs, val);
124 	iwl_trans_write_prph(trans, ofs, val);
125 }
126 IWL_EXPORT_SYMBOL(iwl_write_prph_no_grab);
127 
iwl_write_prph64_no_grab(struct iwl_trans * trans,u64 ofs,u64 val)128 void iwl_write_prph64_no_grab(struct iwl_trans *trans, u64 ofs, u64 val)
129 {
130 	trace_iwlwifi_dev_iowrite_prph64(trans->dev, ofs, val);
131 	iwl_write_prph_no_grab(trans, ofs, val & 0xffffffff);
132 	iwl_write_prph_no_grab(trans, ofs + 4, val >> 32);
133 }
134 IWL_EXPORT_SYMBOL(iwl_write_prph64_no_grab);
135 
iwl_read_prph(struct iwl_trans * trans,u32 ofs)136 u32 iwl_read_prph(struct iwl_trans *trans, u32 ofs)
137 {
138 	if (iwl_trans_grab_nic_access(trans)) {
139 		u32 val = iwl_read_prph_no_grab(trans, ofs);
140 
141 		iwl_trans_release_nic_access(trans);
142 
143 		return val;
144 	}
145 
146 	return 0x5a5a5a5a;
147 }
148 IWL_EXPORT_SYMBOL(iwl_read_prph);
149 
iwl_write_prph_delay(struct iwl_trans * trans,u32 ofs,u32 val,u32 delay_ms)150 void iwl_write_prph_delay(struct iwl_trans *trans, u32 ofs, u32 val, u32 delay_ms)
151 {
152 	if (iwl_trans_grab_nic_access(trans)) {
153 		mdelay(delay_ms);
154 		iwl_write_prph_no_grab(trans, ofs, val);
155 		iwl_trans_release_nic_access(trans);
156 	}
157 }
158 IWL_EXPORT_SYMBOL(iwl_write_prph_delay);
159 
iwl_poll_prph_bit(struct iwl_trans * trans,u32 addr,u32 bits,u32 mask,int timeout)160 int iwl_poll_prph_bit(struct iwl_trans *trans, u32 addr,
161 		      u32 bits, u32 mask, int timeout)
162 {
163 	int t = 0;
164 
165 	do {
166 		if ((iwl_read_prph(trans, addr) & mask) == (bits & mask))
167 			return t;
168 		udelay(IWL_POLL_INTERVAL);
169 		t += IWL_POLL_INTERVAL;
170 	} while (t < timeout);
171 
172 	return -ETIMEDOUT;
173 }
174 
iwl_set_bits_prph(struct iwl_trans * trans,u32 ofs,u32 mask)175 void iwl_set_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
176 {
177 	if (iwl_trans_grab_nic_access(trans)) {
178 		iwl_write_prph_no_grab(trans, ofs,
179 				       iwl_read_prph_no_grab(trans, ofs) |
180 				       mask);
181 		iwl_trans_release_nic_access(trans);
182 	}
183 }
184 IWL_EXPORT_SYMBOL(iwl_set_bits_prph);
185 
iwl_set_bits_mask_prph(struct iwl_trans * trans,u32 ofs,u32 bits,u32 mask)186 void iwl_set_bits_mask_prph(struct iwl_trans *trans, u32 ofs,
187 			    u32 bits, u32 mask)
188 {
189 	if (iwl_trans_grab_nic_access(trans)) {
190 		iwl_write_prph_no_grab(trans, ofs,
191 				       (iwl_read_prph_no_grab(trans, ofs) &
192 					mask) | bits);
193 		iwl_trans_release_nic_access(trans);
194 	}
195 }
196 IWL_EXPORT_SYMBOL(iwl_set_bits_mask_prph);
197 
iwl_clear_bits_prph(struct iwl_trans * trans,u32 ofs,u32 mask)198 void iwl_clear_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
199 {
200 	u32 val;
201 
202 	if (iwl_trans_grab_nic_access(trans)) {
203 		val = iwl_read_prph_no_grab(trans, ofs);
204 		iwl_write_prph_no_grab(trans, ofs, (val & ~mask));
205 		iwl_trans_release_nic_access(trans);
206 	}
207 }
208 IWL_EXPORT_SYMBOL(iwl_clear_bits_prph);
209 
iwl_force_nmi(struct iwl_trans * trans)210 void iwl_force_nmi(struct iwl_trans *trans)
211 {
212 	if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_9000)
213 		iwl_write_prph_delay(trans, DEVICE_SET_NMI_REG,
214 				     DEVICE_SET_NMI_VAL_DRV, 1);
215 	else if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_AX210)
216 		iwl_write_umac_prph(trans, UREG_NIC_SET_NMI_DRIVER,
217 				UREG_NIC_SET_NMI_DRIVER_NMI_FROM_DRIVER);
218 	else if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_BZ)
219 		iwl_write_umac_prph(trans, UREG_DOORBELL_TO_ISR6,
220 				    UREG_DOORBELL_TO_ISR6_NMI_BIT);
221 	else
222 		iwl_write32(trans, CSR_DOORBELL_VECTOR,
223 			    UREG_DOORBELL_TO_ISR6_NMI_BIT);
224 }
225 IWL_EXPORT_SYMBOL(iwl_force_nmi);
226 
get_rfh_string(int cmd)227 static const char *get_rfh_string(int cmd)
228 {
229 #define IWL_CMD(x) case x: return #x
230 #define IWL_CMD_MQ(arg, reg, q) { if (arg == reg(q)) return #reg; }
231 
232 	int i;
233 
234 	for (i = 0; i < IWL_MAX_RX_HW_QUEUES; i++) {
235 		IWL_CMD_MQ(cmd, RFH_Q_FRBDCB_BA_LSB, i);
236 		IWL_CMD_MQ(cmd, RFH_Q_FRBDCB_WIDX, i);
237 		IWL_CMD_MQ(cmd, RFH_Q_FRBDCB_RIDX, i);
238 		IWL_CMD_MQ(cmd, RFH_Q_URBD_STTS_WPTR_LSB, i);
239 	}
240 
241 	switch (cmd) {
242 	IWL_CMD(RFH_RXF_DMA_CFG);
243 	IWL_CMD(RFH_GEN_CFG);
244 	IWL_CMD(RFH_GEN_STATUS);
245 	IWL_CMD(FH_TSSR_TX_STATUS_REG);
246 	IWL_CMD(FH_TSSR_TX_ERROR_REG);
247 	default:
248 		return "UNKNOWN";
249 	}
250 #undef IWL_CMD_MQ
251 }
252 
253 struct reg {
254 	u32 addr;
255 	bool is64;
256 };
257 
iwl_dump_rfh(struct iwl_trans * trans,char ** buf)258 static int iwl_dump_rfh(struct iwl_trans *trans, char **buf)
259 {
260 	int i, q;
261 	int num_q = trans->num_rx_queues;
262 	static const u32 rfh_tbl[] = {
263 		RFH_RXF_DMA_CFG,
264 		RFH_GEN_CFG,
265 		RFH_GEN_STATUS,
266 		FH_TSSR_TX_STATUS_REG,
267 		FH_TSSR_TX_ERROR_REG,
268 	};
269 	static const struct reg rfh_mq_tbl[] = {
270 		{ RFH_Q0_FRBDCB_BA_LSB, true },
271 		{ RFH_Q0_FRBDCB_WIDX, false },
272 		{ RFH_Q0_FRBDCB_RIDX, false },
273 		{ RFH_Q0_URBD_STTS_WPTR_LSB, true },
274 	};
275 
276 #ifdef CONFIG_IWLWIFI_DEBUGFS
277 	if (buf) {
278 		int pos = 0;
279 		/*
280 		 * Register (up to 34 for name + 8 blank/q for MQ): 40 chars
281 		 * Colon + space: 2 characters
282 		 * 0X%08x: 10 characters
283 		 * New line: 1 character
284 		 * Total of 53 characters
285 		 */
286 		size_t bufsz = ARRAY_SIZE(rfh_tbl) * 53 +
287 			       ARRAY_SIZE(rfh_mq_tbl) * 53 * num_q + 40;
288 
289 		*buf = kmalloc(bufsz, GFP_KERNEL);
290 		if (!*buf)
291 			return -ENOMEM;
292 
293 		pos += scnprintf(*buf + pos, bufsz - pos,
294 				"RFH register values:\n");
295 
296 		for (i = 0; i < ARRAY_SIZE(rfh_tbl); i++)
297 			pos += scnprintf(*buf + pos, bufsz - pos,
298 				"%40s: 0X%08x\n",
299 				get_rfh_string(rfh_tbl[i]),
300 				iwl_read_prph(trans, rfh_tbl[i]));
301 
302 		for (i = 0; i < ARRAY_SIZE(rfh_mq_tbl); i++)
303 			for (q = 0; q < num_q; q++) {
304 				u32 addr = rfh_mq_tbl[i].addr;
305 
306 				addr += q * (rfh_mq_tbl[i].is64 ? 8 : 4);
307 				pos += scnprintf(*buf + pos, bufsz - pos,
308 					"%34s(q %2d): 0X%08x\n",
309 					get_rfh_string(addr), q,
310 					iwl_read_prph(trans, addr));
311 			}
312 
313 		return pos;
314 	}
315 #endif
316 
317 	IWL_ERR(trans, "RFH register values:\n");
318 	for (i = 0; i < ARRAY_SIZE(rfh_tbl); i++)
319 		IWL_ERR(trans, "  %34s: 0X%08x\n",
320 			get_rfh_string(rfh_tbl[i]),
321 			iwl_read_prph(trans, rfh_tbl[i]));
322 
323 	for (i = 0; i < ARRAY_SIZE(rfh_mq_tbl); i++)
324 		for (q = 0; q < num_q; q++) {
325 			u32 addr = rfh_mq_tbl[i].addr;
326 
327 			addr += q * (rfh_mq_tbl[i].is64 ? 8 : 4);
328 			IWL_ERR(trans, "  %34s(q %d): 0X%08x\n",
329 				get_rfh_string(addr), q,
330 				iwl_read_prph(trans, addr));
331 		}
332 
333 	return 0;
334 }
335 
get_fh_string(int cmd)336 static const char *get_fh_string(int cmd)
337 {
338 	switch (cmd) {
339 	IWL_CMD(FH_RSCSR_CHNL0_STTS_WPTR_REG);
340 	IWL_CMD(FH_RSCSR_CHNL0_RBDCB_BASE_REG);
341 	IWL_CMD(FH_RSCSR_CHNL0_WPTR);
342 	IWL_CMD(FH_MEM_RCSR_CHNL0_CONFIG_REG);
343 	IWL_CMD(FH_MEM_RSSR_SHARED_CTRL_REG);
344 	IWL_CMD(FH_MEM_RSSR_RX_STATUS_REG);
345 	IWL_CMD(FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV);
346 	IWL_CMD(FH_TSSR_TX_STATUS_REG);
347 	IWL_CMD(FH_TSSR_TX_ERROR_REG);
348 	default:
349 		return "UNKNOWN";
350 	}
351 #undef IWL_CMD
352 }
353 
iwl_dump_fh(struct iwl_trans * trans,char ** buf)354 int iwl_dump_fh(struct iwl_trans *trans, char **buf)
355 {
356 	int i;
357 	static const u32 fh_tbl[] = {
358 		FH_RSCSR_CHNL0_STTS_WPTR_REG,
359 		FH_RSCSR_CHNL0_RBDCB_BASE_REG,
360 		FH_RSCSR_CHNL0_WPTR,
361 		FH_MEM_RCSR_CHNL0_CONFIG_REG,
362 		FH_MEM_RSSR_SHARED_CTRL_REG,
363 		FH_MEM_RSSR_RX_STATUS_REG,
364 		FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV,
365 		FH_TSSR_TX_STATUS_REG,
366 		FH_TSSR_TX_ERROR_REG
367 	};
368 
369 	if (trans->trans_cfg->mq_rx_supported)
370 		return iwl_dump_rfh(trans, buf);
371 
372 #ifdef CONFIG_IWLWIFI_DEBUGFS
373 	if (buf) {
374 		int pos = 0;
375 		size_t bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;
376 
377 		*buf = kmalloc(bufsz, GFP_KERNEL);
378 		if (!*buf)
379 			return -ENOMEM;
380 
381 		pos += scnprintf(*buf + pos, bufsz - pos,
382 				"FH register values:\n");
383 
384 		for (i = 0; i < ARRAY_SIZE(fh_tbl); i++)
385 			pos += scnprintf(*buf + pos, bufsz - pos,
386 				"  %34s: 0X%08x\n",
387 				get_fh_string(fh_tbl[i]),
388 				iwl_read_direct32(trans, fh_tbl[i]));
389 
390 		return pos;
391 	}
392 #endif
393 
394 	IWL_ERR(trans, "FH register values:\n");
395 	for (i = 0; i <  ARRAY_SIZE(fh_tbl); i++)
396 		IWL_ERR(trans, "  %34s: 0X%08x\n",
397 			get_fh_string(fh_tbl[i]),
398 			iwl_read_direct32(trans, fh_tbl[i]));
399 
400 	return 0;
401 }
402 
403 #define IWL_HOST_MON_BLOCK_PEMON	0x00
404 #define IWL_HOST_MON_BLOCK_HIPM		0x22
405 
406 #define IWL_HOST_MON_BLOCK_PEMON_VEC0	0x00
407 #define IWL_HOST_MON_BLOCK_PEMON_VEC1	0x01
408 #define IWL_HOST_MON_BLOCK_PEMON_WFPM	0x06
409 
iwl_dump_host_monitor_block(struct iwl_trans * trans,u32 block,u32 vec,u32 iter)410 static void iwl_dump_host_monitor_block(struct iwl_trans *trans,
411 					u32 block, u32 vec, u32 iter)
412 {
413 	int i;
414 
415 	IWL_ERR(trans, "Host monitor block 0x%x vector 0x%x\n", block, vec);
416 	iwl_write32(trans, CSR_MONITOR_CFG_REG, (block << 8) | vec);
417 	for (i = 0; i < iter; i++)
418 		IWL_ERR(trans, "    value [iter %d]: 0x%08x\n",
419 			i, iwl_read32(trans, CSR_MONITOR_STATUS_REG));
420 }
421 
iwl_dump_host_monitor(struct iwl_trans * trans)422 static void iwl_dump_host_monitor(struct iwl_trans *trans)
423 {
424 	switch (trans->trans_cfg->device_family) {
425 	case IWL_DEVICE_FAMILY_22000:
426 	case IWL_DEVICE_FAMILY_AX210:
427 		IWL_ERR(trans, "CSR_RESET = 0x%x\n",
428 			iwl_read32(trans, CSR_RESET));
429 		iwl_dump_host_monitor_block(trans, IWL_HOST_MON_BLOCK_PEMON,
430 					    IWL_HOST_MON_BLOCK_PEMON_VEC0, 15);
431 		iwl_dump_host_monitor_block(trans, IWL_HOST_MON_BLOCK_PEMON,
432 					    IWL_HOST_MON_BLOCK_PEMON_VEC1, 15);
433 		iwl_dump_host_monitor_block(trans, IWL_HOST_MON_BLOCK_PEMON,
434 					    IWL_HOST_MON_BLOCK_PEMON_WFPM, 15);
435 		iwl_dump_host_monitor_block(trans, IWL_HOST_MON_BLOCK_HIPM,
436 					    IWL_HOST_MON_BLOCK_PEMON_VEC0, 1);
437 		break;
438 	default:
439 		/* not supported yet */
440 		return;
441 	}
442 }
443 
iwl_finish_nic_init(struct iwl_trans * trans)444 int iwl_finish_nic_init(struct iwl_trans *trans)
445 {
446 	const struct iwl_cfg_trans_params *cfg_trans = trans->trans_cfg;
447 	u32 poll_ready;
448 	int err;
449 
450 	if (cfg_trans->bisr_workaround) {
451 		/* ensure the TOP FSM isn't still in previous reset */
452 		mdelay(2);
453 	}
454 
455 	/*
456 	 * Set "initialization complete" bit to move adapter from
457 	 * D0U* --> D0A* (powered-up active) state.
458 	 */
459 	if (cfg_trans->device_family >= IWL_DEVICE_FAMILY_BZ) {
460 		iwl_set_bit(trans, CSR_GP_CNTRL,
461 			    CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
462 			    CSR_GP_CNTRL_REG_FLAG_MAC_INIT);
463 		poll_ready = CSR_GP_CNTRL_REG_FLAG_MAC_STATUS;
464 	} else {
465 		iwl_set_bit(trans, CSR_GP_CNTRL,
466 			    CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
467 		poll_ready = CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY;
468 	}
469 
470 	if (cfg_trans->device_family == IWL_DEVICE_FAMILY_8000)
471 		udelay(2);
472 
473 	/*
474 	 * Wait for clock stabilization; once stabilized, access to
475 	 * device-internal resources is supported, e.g. iwl_write_prph()
476 	 * and accesses to uCode SRAM.
477 	 */
478 	err = iwl_poll_bit(trans, CSR_GP_CNTRL, poll_ready, poll_ready, 25000);
479 	if (err < 0) {
480 		IWL_DEBUG_INFO(trans, "Failed to wake NIC\n");
481 
482 		iwl_dump_host_monitor(trans);
483 	}
484 
485 	if (cfg_trans->bisr_workaround) {
486 		/* ensure BISR shift has finished */
487 		udelay(200);
488 	}
489 
490 	return err < 0 ? err : 0;
491 }
492 IWL_EXPORT_SYMBOL(iwl_finish_nic_init);
493 
iwl_trans_sync_nmi_with_addr(struct iwl_trans * trans,u32 inta_addr,u32 sw_err_bit)494 void iwl_trans_sync_nmi_with_addr(struct iwl_trans *trans, u32 inta_addr,
495 				  u32 sw_err_bit)
496 {
497 	unsigned long timeout = jiffies + IWL_TRANS_NMI_TIMEOUT;
498 	bool interrupts_enabled = test_bit(STATUS_INT_ENABLED, &trans->status);
499 
500 	/* if the interrupts were already disabled, there is no point in
501 	 * calling iwl_disable_interrupts
502 	 */
503 	if (interrupts_enabled)
504 		iwl_trans_interrupts(trans, false);
505 
506 	iwl_force_nmi(trans);
507 	while (time_after(timeout, jiffies)) {
508 		u32 inta_hw = iwl_read32(trans, inta_addr);
509 
510 		/* Error detected by uCode */
511 		if (inta_hw & sw_err_bit) {
512 			/* Clear causes register */
513 			iwl_write32(trans, inta_addr, inta_hw & sw_err_bit);
514 			break;
515 		}
516 
517 		mdelay(1);
518 	}
519 
520 	/* enable interrupts only if there were already enabled before this
521 	 * function to avoid a case were the driver enable interrupts before
522 	 * proper configurations were made
523 	 */
524 	if (interrupts_enabled)
525 		iwl_trans_interrupts(trans, true);
526 
527 	iwl_trans_fw_error(trans, false);
528 }
529