1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2021, MediaTek Inc.
4  * Copyright (c) 2021-2022, Intel Corporation.
5  *
6  * Authors:
7  *  Amir Hanania <amir.hanania@intel.com>
8  *  Haijun Liu <haijun.liu@mediatek.com>
9  *  Moises Veleta <moises.veleta@intel.com>
10  *  Ricardo Martinez <ricardo.martinez@linux.intel.com>
11  *
12  * Contributors:
13  *  Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
14  *  Eliot Lee <eliot.lee@intel.com>
15  *  Sreehari Kancharla <sreehari.kancharla@intel.com>
16  */
17 
18 #include <linux/device.h>
19 #include <linux/gfp.h>
20 #include <linux/irqreturn.h>
21 #include <linux/kernel.h>
22 #include <linux/list.h>
23 #include <linux/string.h>
24 #include <linux/wait.h>
25 #include <linux/workqueue.h>
26 
27 #include "t7xx_dpmaif.h"
28 #include "t7xx_hif_dpmaif.h"
29 #include "t7xx_hif_dpmaif_rx.h"
30 #include "t7xx_hif_dpmaif_tx.h"
31 #include "t7xx_pci.h"
32 #include "t7xx_pcie_mac.h"
33 #include "t7xx_state_monitor.h"
34 
35 unsigned int t7xx_ring_buf_get_next_wr_idx(unsigned int buf_len, unsigned int buf_idx)
36 {
37 	buf_idx++;
38 
39 	return buf_idx < buf_len ? buf_idx : 0;
40 }
41 
42 unsigned int t7xx_ring_buf_rd_wr_count(unsigned int total_cnt, unsigned int rd_idx,
43 				       unsigned int wr_idx, enum dpmaif_rdwr rd_wr)
44 {
45 	int pkt_cnt;
46 
47 	if (rd_wr == DPMAIF_READ)
48 		pkt_cnt = wr_idx - rd_idx;
49 	else
50 		pkt_cnt = rd_idx - wr_idx - 1;
51 
52 	if (pkt_cnt < 0)
53 		pkt_cnt += total_cnt;
54 
55 	return (unsigned int)pkt_cnt;
56 }
57 
58 static void t7xx_dpmaif_enable_irq(struct dpmaif_ctrl *dpmaif_ctrl)
59 {
60 	struct dpmaif_isr_para *isr_para;
61 	int i;
62 
63 	for (i = 0; i < ARRAY_SIZE(dpmaif_ctrl->isr_para); i++) {
64 		isr_para = &dpmaif_ctrl->isr_para[i];
65 		t7xx_pcie_mac_set_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
66 	}
67 }
68 
69 static void t7xx_dpmaif_disable_irq(struct dpmaif_ctrl *dpmaif_ctrl)
70 {
71 	struct dpmaif_isr_para *isr_para;
72 	int i;
73 
74 	for (i = 0; i < ARRAY_SIZE(dpmaif_ctrl->isr_para); i++) {
75 		isr_para = &dpmaif_ctrl->isr_para[i];
76 		t7xx_pcie_mac_clear_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
77 	}
78 }
79 
80 static void t7xx_dpmaif_irq_cb(struct dpmaif_isr_para *isr_para)
81 {
82 	struct dpmaif_ctrl *dpmaif_ctrl = isr_para->dpmaif_ctrl;
83 	struct dpmaif_hw_intr_st_para intr_status;
84 	struct device *dev = dpmaif_ctrl->dev;
85 	struct dpmaif_hw_info *hw_info;
86 	int i;
87 
88 	memset(&intr_status, 0, sizeof(intr_status));
89 	hw_info = &dpmaif_ctrl->hw_info;
90 
91 	if (t7xx_dpmaif_hw_get_intr_cnt(hw_info, &intr_status, isr_para->dlq_id) < 0) {
92 		dev_err(dev, "Failed to get HW interrupt count\n");
93 		return;
94 	}
95 
96 	t7xx_pcie_mac_clear_int_status(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
97 
98 	for (i = 0; i < intr_status.intr_cnt; i++) {
99 		switch (intr_status.intr_types[i]) {
100 		case DPF_INTR_UL_DONE:
101 			t7xx_dpmaif_irq_tx_done(dpmaif_ctrl, intr_status.intr_queues[i]);
102 			break;
103 
104 		case DPF_INTR_UL_DRB_EMPTY:
105 		case DPF_INTR_UL_MD_NOTREADY:
106 		case DPF_INTR_UL_MD_PWR_NOTREADY:
107 			/* No need to log an error for these */
108 			break;
109 
110 		case DPF_INTR_DL_BATCNT_LEN_ERR:
111 			dev_err_ratelimited(dev, "DL interrupt: packet BAT count length error\n");
112 			t7xx_dpmaif_dl_unmask_batcnt_len_err_intr(hw_info);
113 			break;
114 
115 		case DPF_INTR_DL_PITCNT_LEN_ERR:
116 			dev_err_ratelimited(dev, "DL interrupt: PIT count length error\n");
117 			t7xx_dpmaif_dl_unmask_pitcnt_len_err_intr(hw_info);
118 			break;
119 
120 		case DPF_INTR_DL_Q0_PITCNT_LEN_ERR:
121 			dev_err_ratelimited(dev, "DL interrupt: DLQ0 PIT count length error\n");
122 			t7xx_dpmaif_dlq_unmask_pitcnt_len_err_intr(hw_info, DPF_RX_QNO_DFT);
123 			break;
124 
125 		case DPF_INTR_DL_Q1_PITCNT_LEN_ERR:
126 			dev_err_ratelimited(dev, "DL interrupt: DLQ1 PIT count length error\n");
127 			t7xx_dpmaif_dlq_unmask_pitcnt_len_err_intr(hw_info, DPF_RX_QNO1);
128 			break;
129 
130 		case DPF_INTR_DL_DONE:
131 		case DPF_INTR_DL_Q0_DONE:
132 		case DPF_INTR_DL_Q1_DONE:
133 			t7xx_dpmaif_irq_rx_done(dpmaif_ctrl, intr_status.intr_queues[i]);
134 			break;
135 
136 		default:
137 			dev_err_ratelimited(dev, "DL interrupt error: unknown type : %d\n",
138 					    intr_status.intr_types[i]);
139 		}
140 	}
141 }
142 
143 static irqreturn_t t7xx_dpmaif_isr_handler(int irq, void *data)
144 {
145 	struct dpmaif_isr_para *isr_para = data;
146 	struct dpmaif_ctrl *dpmaif_ctrl;
147 
148 	dpmaif_ctrl = isr_para->dpmaif_ctrl;
149 	if (dpmaif_ctrl->state != DPMAIF_STATE_PWRON) {
150 		dev_err(dpmaif_ctrl->dev, "Interrupt received before initializing DPMAIF\n");
151 		return IRQ_HANDLED;
152 	}
153 
154 	t7xx_pcie_mac_clear_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
155 	t7xx_dpmaif_irq_cb(isr_para);
156 	t7xx_pcie_mac_set_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
157 	return IRQ_HANDLED;
158 }
159 
160 static void t7xx_dpmaif_isr_parameter_init(struct dpmaif_ctrl *dpmaif_ctrl)
161 {
162 	struct dpmaif_isr_para *isr_para;
163 	unsigned char i;
164 
165 	dpmaif_ctrl->rxq_int_mapping[DPF_RX_QNO0] = DPMAIF_INT;
166 	dpmaif_ctrl->rxq_int_mapping[DPF_RX_QNO1] = DPMAIF2_INT;
167 
168 	for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
169 		isr_para = &dpmaif_ctrl->isr_para[i];
170 		isr_para->dpmaif_ctrl = dpmaif_ctrl;
171 		isr_para->dlq_id = i;
172 		isr_para->pcie_int = dpmaif_ctrl->rxq_int_mapping[i];
173 	}
174 }
175 
176 static void t7xx_dpmaif_register_pcie_irq(struct dpmaif_ctrl *dpmaif_ctrl)
177 {
178 	struct t7xx_pci_dev *t7xx_dev = dpmaif_ctrl->t7xx_dev;
179 	struct dpmaif_isr_para *isr_para;
180 	enum t7xx_int int_type;
181 	int i;
182 
183 	t7xx_dpmaif_isr_parameter_init(dpmaif_ctrl);
184 
185 	for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
186 		isr_para = &dpmaif_ctrl->isr_para[i];
187 		int_type = isr_para->pcie_int;
188 		t7xx_pcie_mac_clear_int(t7xx_dev, int_type);
189 
190 		t7xx_dev->intr_handler[int_type] = t7xx_dpmaif_isr_handler;
191 		t7xx_dev->intr_thread[int_type] = NULL;
192 		t7xx_dev->callback_param[int_type] = isr_para;
193 
194 		t7xx_pcie_mac_clear_int_status(t7xx_dev, int_type);
195 		t7xx_pcie_mac_set_int(t7xx_dev, int_type);
196 	}
197 }
198 
199 static int t7xx_dpmaif_rxtx_sw_allocs(struct dpmaif_ctrl *dpmaif_ctrl)
200 {
201 	struct dpmaif_rx_queue *rx_q;
202 	struct dpmaif_tx_queue *tx_q;
203 	int ret, rx_idx, tx_idx, i;
204 
205 	ret = t7xx_dpmaif_bat_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_req, BAT_TYPE_NORMAL);
206 	if (ret) {
207 		dev_err(dpmaif_ctrl->dev, "Failed to allocate normal BAT table: %d\n", ret);
208 		return ret;
209 	}
210 
211 	ret = t7xx_dpmaif_bat_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_frag, BAT_TYPE_FRAG);
212 	if (ret) {
213 		dev_err(dpmaif_ctrl->dev, "Failed to allocate frag BAT table: %d\n", ret);
214 		goto err_free_normal_bat;
215 	}
216 
217 	for (rx_idx = 0; rx_idx < DPMAIF_RXQ_NUM; rx_idx++) {
218 		rx_q = &dpmaif_ctrl->rxq[rx_idx];
219 		rx_q->index = rx_idx;
220 		rx_q->dpmaif_ctrl = dpmaif_ctrl;
221 		ret = t7xx_dpmaif_rxq_init(rx_q);
222 		if (ret)
223 			goto err_free_rxq;
224 	}
225 
226 	for (tx_idx = 0; tx_idx < DPMAIF_TXQ_NUM; tx_idx++) {
227 		tx_q = &dpmaif_ctrl->txq[tx_idx];
228 		tx_q->index = tx_idx;
229 		tx_q->dpmaif_ctrl = dpmaif_ctrl;
230 		ret = t7xx_dpmaif_txq_init(tx_q);
231 		if (ret)
232 			goto err_free_txq;
233 	}
234 
235 	ret = t7xx_dpmaif_tx_thread_init(dpmaif_ctrl);
236 	if (ret) {
237 		dev_err(dpmaif_ctrl->dev, "Failed to start TX thread\n");
238 		goto err_free_txq;
239 	}
240 
241 	ret = t7xx_dpmaif_bat_rel_wq_alloc(dpmaif_ctrl);
242 	if (ret)
243 		goto err_thread_rel;
244 
245 	return 0;
246 
247 err_thread_rel:
248 	t7xx_dpmaif_tx_thread_rel(dpmaif_ctrl);
249 
250 err_free_txq:
251 	for (i = 0; i < tx_idx; i++) {
252 		tx_q = &dpmaif_ctrl->txq[i];
253 		t7xx_dpmaif_txq_free(tx_q);
254 	}
255 
256 err_free_rxq:
257 	for (i = 0; i < rx_idx; i++) {
258 		rx_q = &dpmaif_ctrl->rxq[i];
259 		t7xx_dpmaif_rxq_free(rx_q);
260 	}
261 
262 	t7xx_dpmaif_bat_free(dpmaif_ctrl, &dpmaif_ctrl->bat_frag);
263 
264 err_free_normal_bat:
265 	t7xx_dpmaif_bat_free(dpmaif_ctrl, &dpmaif_ctrl->bat_req);
266 
267 	return ret;
268 }
269 
270 static void t7xx_dpmaif_sw_release(struct dpmaif_ctrl *dpmaif_ctrl)
271 {
272 	struct dpmaif_rx_queue *rx_q;
273 	struct dpmaif_tx_queue *tx_q;
274 	int i;
275 
276 	t7xx_dpmaif_tx_thread_rel(dpmaif_ctrl);
277 	t7xx_dpmaif_bat_wq_rel(dpmaif_ctrl);
278 
279 	for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
280 		tx_q = &dpmaif_ctrl->txq[i];
281 		t7xx_dpmaif_txq_free(tx_q);
282 	}
283 
284 	for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
285 		rx_q = &dpmaif_ctrl->rxq[i];
286 		t7xx_dpmaif_rxq_free(rx_q);
287 	}
288 }
289 
290 static int t7xx_dpmaif_start(struct dpmaif_ctrl *dpmaif_ctrl)
291 {
292 	struct dpmaif_hw_info *hw_info = &dpmaif_ctrl->hw_info;
293 	struct dpmaif_hw_params hw_init_para;
294 	struct dpmaif_rx_queue *rxq;
295 	struct dpmaif_tx_queue *txq;
296 	unsigned int buf_cnt;
297 	int i, ret = 0;
298 
299 	if (dpmaif_ctrl->state == DPMAIF_STATE_PWRON)
300 		return -EFAULT;
301 
302 	memset(&hw_init_para, 0, sizeof(hw_init_para));
303 
304 	for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
305 		rxq = &dpmaif_ctrl->rxq[i];
306 		rxq->que_started = true;
307 		rxq->index = i;
308 		rxq->budget = rxq->bat_req->bat_size_cnt - 1;
309 
310 		hw_init_para.pkt_bat_base_addr[i] = rxq->bat_req->bat_bus_addr;
311 		hw_init_para.pkt_bat_size_cnt[i] = rxq->bat_req->bat_size_cnt;
312 		hw_init_para.pit_base_addr[i] = rxq->pit_bus_addr;
313 		hw_init_para.pit_size_cnt[i] = rxq->pit_size_cnt;
314 		hw_init_para.frg_bat_base_addr[i] = rxq->bat_frag->bat_bus_addr;
315 		hw_init_para.frg_bat_size_cnt[i] = rxq->bat_frag->bat_size_cnt;
316 	}
317 
318 	bitmap_zero(dpmaif_ctrl->bat_req.bat_bitmap, dpmaif_ctrl->bat_req.bat_size_cnt);
319 	buf_cnt = dpmaif_ctrl->bat_req.bat_size_cnt - 1;
320 	ret = t7xx_dpmaif_rx_buf_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_req, 0, buf_cnt, true);
321 	if (ret) {
322 		dev_err(dpmaif_ctrl->dev, "Failed to allocate RX buffer: %d\n", ret);
323 		return ret;
324 	}
325 
326 	buf_cnt = dpmaif_ctrl->bat_frag.bat_size_cnt - 1;
327 	ret = t7xx_dpmaif_rx_frag_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_frag, buf_cnt, true);
328 	if (ret) {
329 		dev_err(dpmaif_ctrl->dev, "Failed to allocate frag RX buffer: %d\n", ret);
330 		goto err_free_normal_bat;
331 	}
332 
333 	for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
334 		txq = &dpmaif_ctrl->txq[i];
335 		txq->que_started = true;
336 
337 		hw_init_para.drb_base_addr[i] = txq->drb_bus_addr;
338 		hw_init_para.drb_size_cnt[i] = txq->drb_size_cnt;
339 	}
340 
341 	ret = t7xx_dpmaif_hw_init(hw_info, &hw_init_para);
342 	if (ret) {
343 		dev_err(dpmaif_ctrl->dev, "Failed to initialize DPMAIF HW: %d\n", ret);
344 		goto err_free_frag_bat;
345 	}
346 
347 	ret = t7xx_dpmaif_dl_snd_hw_bat_cnt(hw_info, rxq->bat_req->bat_size_cnt - 1);
348 	if (ret)
349 		goto err_free_frag_bat;
350 
351 	ret = t7xx_dpmaif_dl_snd_hw_frg_cnt(hw_info, rxq->bat_frag->bat_size_cnt - 1);
352 	if (ret)
353 		goto err_free_frag_bat;
354 
355 	t7xx_dpmaif_ul_clr_all_intr(hw_info);
356 	t7xx_dpmaif_dl_clr_all_intr(hw_info);
357 	dpmaif_ctrl->state = DPMAIF_STATE_PWRON;
358 	t7xx_dpmaif_enable_irq(dpmaif_ctrl);
359 	wake_up(&dpmaif_ctrl->tx_wq);
360 	return 0;
361 
362 err_free_frag_bat:
363 	t7xx_dpmaif_bat_free(rxq->dpmaif_ctrl, rxq->bat_frag);
364 
365 err_free_normal_bat:
366 	t7xx_dpmaif_bat_free(rxq->dpmaif_ctrl, rxq->bat_req);
367 
368 	return ret;
369 }
370 
371 static void t7xx_dpmaif_stop_sw(struct dpmaif_ctrl *dpmaif_ctrl)
372 {
373 	t7xx_dpmaif_tx_stop(dpmaif_ctrl);
374 	t7xx_dpmaif_rx_stop(dpmaif_ctrl);
375 }
376 
377 static void t7xx_dpmaif_stop_hw(struct dpmaif_ctrl *dpmaif_ctrl)
378 {
379 	t7xx_dpmaif_hw_stop_all_txq(&dpmaif_ctrl->hw_info);
380 	t7xx_dpmaif_hw_stop_all_rxq(&dpmaif_ctrl->hw_info);
381 }
382 
383 static int t7xx_dpmaif_stop(struct dpmaif_ctrl *dpmaif_ctrl)
384 {
385 	if (!dpmaif_ctrl->dpmaif_sw_init_done) {
386 		dev_err(dpmaif_ctrl->dev, "dpmaif SW init fail\n");
387 		return -EFAULT;
388 	}
389 
390 	if (dpmaif_ctrl->state == DPMAIF_STATE_PWROFF)
391 		return -EFAULT;
392 
393 	t7xx_dpmaif_disable_irq(dpmaif_ctrl);
394 	dpmaif_ctrl->state = DPMAIF_STATE_PWROFF;
395 	t7xx_dpmaif_stop_sw(dpmaif_ctrl);
396 	t7xx_dpmaif_tx_clear(dpmaif_ctrl);
397 	t7xx_dpmaif_rx_clear(dpmaif_ctrl);
398 	return 0;
399 }
400 
401 static int t7xx_dpmaif_suspend(struct t7xx_pci_dev *t7xx_dev, void *param)
402 {
403 	struct dpmaif_ctrl *dpmaif_ctrl = param;
404 
405 	t7xx_dpmaif_tx_stop(dpmaif_ctrl);
406 	t7xx_dpmaif_hw_stop_all_txq(&dpmaif_ctrl->hw_info);
407 	t7xx_dpmaif_hw_stop_all_rxq(&dpmaif_ctrl->hw_info);
408 	t7xx_dpmaif_disable_irq(dpmaif_ctrl);
409 	t7xx_dpmaif_rx_stop(dpmaif_ctrl);
410 	return 0;
411 }
412 
413 static void t7xx_dpmaif_unmask_dlq_intr(struct dpmaif_ctrl *dpmaif_ctrl)
414 {
415 	int qno;
416 
417 	for (qno = 0; qno < DPMAIF_RXQ_NUM; qno++)
418 		t7xx_dpmaif_dlq_unmask_rx_done(&dpmaif_ctrl->hw_info, qno);
419 }
420 
421 static void t7xx_dpmaif_start_txrx_qs(struct dpmaif_ctrl *dpmaif_ctrl)
422 {
423 	struct dpmaif_rx_queue *rxq;
424 	struct dpmaif_tx_queue *txq;
425 	unsigned int que_cnt;
426 
427 	for (que_cnt = 0; que_cnt < DPMAIF_TXQ_NUM; que_cnt++) {
428 		txq = &dpmaif_ctrl->txq[que_cnt];
429 		txq->que_started = true;
430 	}
431 
432 	for (que_cnt = 0; que_cnt < DPMAIF_RXQ_NUM; que_cnt++) {
433 		rxq = &dpmaif_ctrl->rxq[que_cnt];
434 		rxq->que_started = true;
435 	}
436 }
437 
438 static int t7xx_dpmaif_resume(struct t7xx_pci_dev *t7xx_dev, void *param)
439 {
440 	struct dpmaif_ctrl *dpmaif_ctrl = param;
441 
442 	if (!dpmaif_ctrl)
443 		return 0;
444 
445 	t7xx_dpmaif_start_txrx_qs(dpmaif_ctrl);
446 	t7xx_dpmaif_enable_irq(dpmaif_ctrl);
447 	t7xx_dpmaif_unmask_dlq_intr(dpmaif_ctrl);
448 	t7xx_dpmaif_start_hw(&dpmaif_ctrl->hw_info);
449 	wake_up(&dpmaif_ctrl->tx_wq);
450 	return 0;
451 }
452 
453 static int t7xx_dpmaif_pm_entity_init(struct dpmaif_ctrl *dpmaif_ctrl)
454 {
455 	struct md_pm_entity *dpmaif_pm_entity = &dpmaif_ctrl->dpmaif_pm_entity;
456 	int ret;
457 
458 	INIT_LIST_HEAD(&dpmaif_pm_entity->entity);
459 	dpmaif_pm_entity->suspend = &t7xx_dpmaif_suspend;
460 	dpmaif_pm_entity->suspend_late = NULL;
461 	dpmaif_pm_entity->resume_early = NULL;
462 	dpmaif_pm_entity->resume = &t7xx_dpmaif_resume;
463 	dpmaif_pm_entity->id = PM_ENTITY_ID_DATA;
464 	dpmaif_pm_entity->entity_param = dpmaif_ctrl;
465 
466 	ret = t7xx_pci_pm_entity_register(dpmaif_ctrl->t7xx_dev, dpmaif_pm_entity);
467 	if (ret)
468 		dev_err(dpmaif_ctrl->dev, "dpmaif register pm_entity fail\n");
469 
470 	return ret;
471 }
472 
473 static int t7xx_dpmaif_pm_entity_release(struct dpmaif_ctrl *dpmaif_ctrl)
474 {
475 	struct md_pm_entity *dpmaif_pm_entity = &dpmaif_ctrl->dpmaif_pm_entity;
476 	int ret;
477 
478 	ret = t7xx_pci_pm_entity_unregister(dpmaif_ctrl->t7xx_dev, dpmaif_pm_entity);
479 	if (ret < 0)
480 		dev_err(dpmaif_ctrl->dev, "dpmaif register pm_entity fail\n");
481 
482 	return ret;
483 }
484 
485 int t7xx_dpmaif_md_state_callback(struct dpmaif_ctrl *dpmaif_ctrl, enum md_state state)
486 {
487 	int ret = 0;
488 
489 	switch (state) {
490 	case MD_STATE_WAITING_FOR_HS1:
491 		ret = t7xx_dpmaif_start(dpmaif_ctrl);
492 		break;
493 
494 	case MD_STATE_EXCEPTION:
495 		ret = t7xx_dpmaif_stop(dpmaif_ctrl);
496 		break;
497 
498 	case MD_STATE_STOPPED:
499 		ret = t7xx_dpmaif_stop(dpmaif_ctrl);
500 		break;
501 
502 	case MD_STATE_WAITING_TO_STOP:
503 		t7xx_dpmaif_stop_hw(dpmaif_ctrl);
504 		break;
505 
506 	default:
507 		break;
508 	}
509 
510 	return ret;
511 }
512 
513 /**
514  * t7xx_dpmaif_hif_init() - Initialize data path.
515  * @t7xx_dev: MTK context structure.
516  * @callbacks: Callbacks implemented by the network layer to handle RX skb and
517  *	       event notifications.
518  *
519  * Allocate and initialize datapath control block.
520  * Register datapath ISR, TX and RX resources.
521  *
522  * Return:
523  * * dpmaif_ctrl pointer - Pointer to DPMAIF context structure.
524  * * NULL		 - In case of error.
525  */
526 struct dpmaif_ctrl *t7xx_dpmaif_hif_init(struct t7xx_pci_dev *t7xx_dev,
527 					 struct dpmaif_callbacks *callbacks)
528 {
529 	struct device *dev = &t7xx_dev->pdev->dev;
530 	struct dpmaif_ctrl *dpmaif_ctrl;
531 	int ret;
532 
533 	if (!callbacks)
534 		return NULL;
535 
536 	dpmaif_ctrl = devm_kzalloc(dev, sizeof(*dpmaif_ctrl), GFP_KERNEL);
537 	if (!dpmaif_ctrl)
538 		return NULL;
539 
540 	dpmaif_ctrl->t7xx_dev = t7xx_dev;
541 	dpmaif_ctrl->callbacks = callbacks;
542 	dpmaif_ctrl->dev = dev;
543 	dpmaif_ctrl->dpmaif_sw_init_done = false;
544 	dpmaif_ctrl->hw_info.dev = dev;
545 	dpmaif_ctrl->hw_info.pcie_base = t7xx_dev->base_addr.pcie_ext_reg_base -
546 					 t7xx_dev->base_addr.pcie_dev_reg_trsl_addr;
547 
548 	ret = t7xx_dpmaif_pm_entity_init(dpmaif_ctrl);
549 	if (ret)
550 		return NULL;
551 
552 	t7xx_dpmaif_register_pcie_irq(dpmaif_ctrl);
553 	t7xx_dpmaif_disable_irq(dpmaif_ctrl);
554 
555 	ret = t7xx_dpmaif_rxtx_sw_allocs(dpmaif_ctrl);
556 	if (ret) {
557 		t7xx_dpmaif_pm_entity_release(dpmaif_ctrl);
558 		dev_err(dev, "Failed to allocate RX/TX SW resources: %d\n", ret);
559 		return NULL;
560 	}
561 
562 	dpmaif_ctrl->dpmaif_sw_init_done = true;
563 	return dpmaif_ctrl;
564 }
565 
566 void t7xx_dpmaif_hif_exit(struct dpmaif_ctrl *dpmaif_ctrl)
567 {
568 	if (dpmaif_ctrl->dpmaif_sw_init_done) {
569 		t7xx_dpmaif_stop(dpmaif_ctrl);
570 		t7xx_dpmaif_pm_entity_release(dpmaif_ctrl);
571 		t7xx_dpmaif_sw_release(dpmaif_ctrl);
572 		dpmaif_ctrl->dpmaif_sw_init_done = false;
573 	}
574 }
575