1 // SPDX-License-Identifier: GPL-2.0
2 /**
3 * Host side endpoint driver to implement Non-Transparent Bridge functionality
4 *
5 * Copyright (C) 2020 Texas Instruments
6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
7 */
8
9 #include <linux/delay.h>
10 #include <linux/module.h>
11 #include <linux/pci.h>
12 #include <linux/slab.h>
13 #include <linux/ntb.h>
14
15 #define NTB_EPF_COMMAND 0x0
16 #define CMD_CONFIGURE_DOORBELL 1
17 #define CMD_TEARDOWN_DOORBELL 2
18 #define CMD_CONFIGURE_MW 3
19 #define CMD_TEARDOWN_MW 4
20 #define CMD_LINK_UP 5
21 #define CMD_LINK_DOWN 6
22
23 #define NTB_EPF_ARGUMENT 0x4
24 #define MSIX_ENABLE BIT(16)
25
26 #define NTB_EPF_CMD_STATUS 0x8
27 #define COMMAND_STATUS_OK 1
28 #define COMMAND_STATUS_ERROR 2
29
30 #define NTB_EPF_LINK_STATUS 0x0A
31 #define LINK_STATUS_UP BIT(0)
32
33 #define NTB_EPF_TOPOLOGY 0x0C
34 #define NTB_EPF_LOWER_ADDR 0x10
35 #define NTB_EPF_UPPER_ADDR 0x14
36 #define NTB_EPF_LOWER_SIZE 0x18
37 #define NTB_EPF_UPPER_SIZE 0x1C
38 #define NTB_EPF_MW_COUNT 0x20
39 #define NTB_EPF_MW1_OFFSET 0x24
40 #define NTB_EPF_SPAD_OFFSET 0x28
41 #define NTB_EPF_SPAD_COUNT 0x2C
42 #define NTB_EPF_DB_ENTRY_SIZE 0x30
43 #define NTB_EPF_DB_DATA(n) (0x34 + (n) * 4)
44 #define NTB_EPF_DB_OFFSET(n) (0xB4 + (n) * 4)
45
46 #define NTB_EPF_MIN_DB_COUNT 3
47 #define NTB_EPF_MAX_DB_COUNT 31
48
49 #define NTB_EPF_COMMAND_TIMEOUT 1000 /* 1 Sec */
50
51 enum pci_barno {
52 BAR_0,
53 BAR_1,
54 BAR_2,
55 BAR_3,
56 BAR_4,
57 BAR_5,
58 };
59
60 struct ntb_epf_dev {
61 struct ntb_dev ntb;
62 struct device *dev;
63 /* Mutex to protect providing commands to NTB EPF */
64 struct mutex cmd_lock;
65
66 enum pci_barno ctrl_reg_bar;
67 enum pci_barno peer_spad_reg_bar;
68 enum pci_barno db_reg_bar;
69 enum pci_barno mw_bar;
70
71 unsigned int mw_count;
72 unsigned int spad_count;
73 unsigned int db_count;
74
75 void __iomem *ctrl_reg;
76 void __iomem *db_reg;
77 void __iomem *peer_spad_reg;
78
79 unsigned int self_spad;
80 unsigned int peer_spad;
81
82 int db_val;
83 u64 db_valid_mask;
84 };
85
86 #define ntb_ndev(__ntb) container_of(__ntb, struct ntb_epf_dev, ntb)
87
88 struct ntb_epf_data {
89 /* BAR that contains both control region and self spad region */
90 enum pci_barno ctrl_reg_bar;
91 /* BAR that contains peer spad region */
92 enum pci_barno peer_spad_reg_bar;
93 /* BAR that contains Doorbell region and Memory window '1' */
94 enum pci_barno db_reg_bar;
95 /* BAR that contains memory windows*/
96 enum pci_barno mw_bar;
97 };
98
ntb_epf_send_command(struct ntb_epf_dev * ndev,u32 command,u32 argument)99 static int ntb_epf_send_command(struct ntb_epf_dev *ndev, u32 command,
100 u32 argument)
101 {
102 ktime_t timeout;
103 bool timedout;
104 int ret = 0;
105 u32 status;
106
107 mutex_lock(&ndev->cmd_lock);
108 writel(argument, ndev->ctrl_reg + NTB_EPF_ARGUMENT);
109 writel(command, ndev->ctrl_reg + NTB_EPF_COMMAND);
110
111 timeout = ktime_add_ms(ktime_get(), NTB_EPF_COMMAND_TIMEOUT);
112 while (1) {
113 timedout = ktime_after(ktime_get(), timeout);
114 status = readw(ndev->ctrl_reg + NTB_EPF_CMD_STATUS);
115
116 if (status == COMMAND_STATUS_ERROR) {
117 ret = -EINVAL;
118 break;
119 }
120
121 if (status == COMMAND_STATUS_OK)
122 break;
123
124 if (WARN_ON(timedout)) {
125 ret = -ETIMEDOUT;
126 break;
127 }
128
129 usleep_range(5, 10);
130 }
131
132 writew(0, ndev->ctrl_reg + NTB_EPF_CMD_STATUS);
133 mutex_unlock(&ndev->cmd_lock);
134
135 return ret;
136 }
137
ntb_epf_mw_to_bar(struct ntb_epf_dev * ndev,int idx)138 static int ntb_epf_mw_to_bar(struct ntb_epf_dev *ndev, int idx)
139 {
140 struct device *dev = ndev->dev;
141
142 if (idx < 0 || idx > ndev->mw_count) {
143 dev_err(dev, "Unsupported Memory Window index %d\n", idx);
144 return -EINVAL;
145 }
146
147 return idx + 2;
148 }
149
ntb_epf_mw_count(struct ntb_dev * ntb,int pidx)150 static int ntb_epf_mw_count(struct ntb_dev *ntb, int pidx)
151 {
152 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
153 struct device *dev = ndev->dev;
154
155 if (pidx != NTB_DEF_PEER_IDX) {
156 dev_err(dev, "Unsupported Peer ID %d\n", pidx);
157 return -EINVAL;
158 }
159
160 return ndev->mw_count;
161 }
162
ntb_epf_mw_get_align(struct ntb_dev * ntb,int pidx,int idx,resource_size_t * addr_align,resource_size_t * size_align,resource_size_t * size_max)163 static int ntb_epf_mw_get_align(struct ntb_dev *ntb, int pidx, int idx,
164 resource_size_t *addr_align,
165 resource_size_t *size_align,
166 resource_size_t *size_max)
167 {
168 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
169 struct device *dev = ndev->dev;
170 int bar;
171
172 if (pidx != NTB_DEF_PEER_IDX) {
173 dev_err(dev, "Unsupported Peer ID %d\n", pidx);
174 return -EINVAL;
175 }
176
177 bar = ntb_epf_mw_to_bar(ndev, idx);
178 if (bar < 0)
179 return bar;
180
181 if (addr_align)
182 *addr_align = SZ_4K;
183
184 if (size_align)
185 *size_align = 1;
186
187 if (size_max)
188 *size_max = pci_resource_len(ndev->ntb.pdev, bar);
189
190 return 0;
191 }
192
ntb_epf_link_is_up(struct ntb_dev * ntb,enum ntb_speed * speed,enum ntb_width * width)193 static u64 ntb_epf_link_is_up(struct ntb_dev *ntb,
194 enum ntb_speed *speed,
195 enum ntb_width *width)
196 {
197 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
198 u32 status;
199
200 status = readw(ndev->ctrl_reg + NTB_EPF_LINK_STATUS);
201
202 return status & LINK_STATUS_UP;
203 }
204
ntb_epf_spad_read(struct ntb_dev * ntb,int idx)205 static u32 ntb_epf_spad_read(struct ntb_dev *ntb, int idx)
206 {
207 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
208 struct device *dev = ndev->dev;
209 u32 offset;
210
211 if (idx < 0 || idx >= ndev->spad_count) {
212 dev_err(dev, "READ: Invalid ScratchPad Index %d\n", idx);
213 return 0;
214 }
215
216 offset = readl(ndev->ctrl_reg + NTB_EPF_SPAD_OFFSET);
217 offset += (idx << 2);
218
219 return readl(ndev->ctrl_reg + offset);
220 }
221
ntb_epf_spad_write(struct ntb_dev * ntb,int idx,u32 val)222 static int ntb_epf_spad_write(struct ntb_dev *ntb,
223 int idx, u32 val)
224 {
225 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
226 struct device *dev = ndev->dev;
227 u32 offset;
228
229 if (idx < 0 || idx >= ndev->spad_count) {
230 dev_err(dev, "WRITE: Invalid ScratchPad Index %d\n", idx);
231 return -EINVAL;
232 }
233
234 offset = readl(ndev->ctrl_reg + NTB_EPF_SPAD_OFFSET);
235 offset += (idx << 2);
236 writel(val, ndev->ctrl_reg + offset);
237
238 return 0;
239 }
240
ntb_epf_peer_spad_read(struct ntb_dev * ntb,int pidx,int idx)241 static u32 ntb_epf_peer_spad_read(struct ntb_dev *ntb, int pidx, int idx)
242 {
243 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
244 struct device *dev = ndev->dev;
245 u32 offset;
246
247 if (pidx != NTB_DEF_PEER_IDX) {
248 dev_err(dev, "Unsupported Peer ID %d\n", pidx);
249 return -EINVAL;
250 }
251
252 if (idx < 0 || idx >= ndev->spad_count) {
253 dev_err(dev, "WRITE: Invalid Peer ScratchPad Index %d\n", idx);
254 return -EINVAL;
255 }
256
257 offset = (idx << 2);
258 return readl(ndev->peer_spad_reg + offset);
259 }
260
ntb_epf_peer_spad_write(struct ntb_dev * ntb,int pidx,int idx,u32 val)261 static int ntb_epf_peer_spad_write(struct ntb_dev *ntb, int pidx,
262 int idx, u32 val)
263 {
264 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
265 struct device *dev = ndev->dev;
266 u32 offset;
267
268 if (pidx != NTB_DEF_PEER_IDX) {
269 dev_err(dev, "Unsupported Peer ID %d\n", pidx);
270 return -EINVAL;
271 }
272
273 if (idx < 0 || idx >= ndev->spad_count) {
274 dev_err(dev, "WRITE: Invalid Peer ScratchPad Index %d\n", idx);
275 return -EINVAL;
276 }
277
278 offset = (idx << 2);
279 writel(val, ndev->peer_spad_reg + offset);
280
281 return 0;
282 }
283
ntb_epf_link_enable(struct ntb_dev * ntb,enum ntb_speed max_speed,enum ntb_width max_width)284 static int ntb_epf_link_enable(struct ntb_dev *ntb,
285 enum ntb_speed max_speed,
286 enum ntb_width max_width)
287 {
288 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
289 struct device *dev = ndev->dev;
290 int ret;
291
292 ret = ntb_epf_send_command(ndev, CMD_LINK_UP, 0);
293 if (ret) {
294 dev_err(dev, "Fail to enable link\n");
295 return ret;
296 }
297
298 return 0;
299 }
300
ntb_epf_link_disable(struct ntb_dev * ntb)301 static int ntb_epf_link_disable(struct ntb_dev *ntb)
302 {
303 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
304 struct device *dev = ndev->dev;
305 int ret;
306
307 ret = ntb_epf_send_command(ndev, CMD_LINK_DOWN, 0);
308 if (ret) {
309 dev_err(dev, "Fail to disable link\n");
310 return ret;
311 }
312
313 return 0;
314 }
315
ntb_epf_vec_isr(int irq,void * dev)316 static irqreturn_t ntb_epf_vec_isr(int irq, void *dev)
317 {
318 struct ntb_epf_dev *ndev = dev;
319 int irq_no;
320
321 irq_no = irq - pci_irq_vector(ndev->ntb.pdev, 0);
322 ndev->db_val = irq_no + 1;
323
324 if (irq_no == 0)
325 ntb_link_event(&ndev->ntb);
326 else
327 ntb_db_event(&ndev->ntb, irq_no);
328
329 return IRQ_HANDLED;
330 }
331
ntb_epf_init_isr(struct ntb_epf_dev * ndev,int msi_min,int msi_max)332 static int ntb_epf_init_isr(struct ntb_epf_dev *ndev, int msi_min, int msi_max)
333 {
334 struct pci_dev *pdev = ndev->ntb.pdev;
335 struct device *dev = ndev->dev;
336 u32 argument = MSIX_ENABLE;
337 int irq;
338 int ret;
339 int i;
340
341 irq = pci_alloc_irq_vectors(pdev, msi_min, msi_max, PCI_IRQ_MSIX);
342 if (irq < 0) {
343 dev_dbg(dev, "Failed to get MSIX interrupts\n");
344 irq = pci_alloc_irq_vectors(pdev, msi_min, msi_max,
345 PCI_IRQ_MSI);
346 if (irq < 0) {
347 dev_err(dev, "Failed to get MSI interrupts\n");
348 return irq;
349 }
350 argument &= ~MSIX_ENABLE;
351 }
352
353 for (i = 0; i < irq; i++) {
354 ret = request_irq(pci_irq_vector(pdev, i), ntb_epf_vec_isr,
355 0, "ntb_epf", ndev);
356 if (ret) {
357 dev_err(dev, "Failed to request irq\n");
358 goto err_request_irq;
359 }
360 }
361
362 ndev->db_count = irq - 1;
363
364 ret = ntb_epf_send_command(ndev, CMD_CONFIGURE_DOORBELL,
365 argument | irq);
366 if (ret) {
367 dev_err(dev, "Failed to configure doorbell\n");
368 goto err_configure_db;
369 }
370
371 return 0;
372
373 err_configure_db:
374 for (i = 0; i < ndev->db_count + 1; i++)
375 free_irq(pci_irq_vector(pdev, i), ndev);
376
377 err_request_irq:
378 pci_free_irq_vectors(pdev);
379
380 return ret;
381 }
382
ntb_epf_peer_mw_count(struct ntb_dev * ntb)383 static int ntb_epf_peer_mw_count(struct ntb_dev *ntb)
384 {
385 return ntb_ndev(ntb)->mw_count;
386 }
387
ntb_epf_spad_count(struct ntb_dev * ntb)388 static int ntb_epf_spad_count(struct ntb_dev *ntb)
389 {
390 return ntb_ndev(ntb)->spad_count;
391 }
392
ntb_epf_db_valid_mask(struct ntb_dev * ntb)393 static u64 ntb_epf_db_valid_mask(struct ntb_dev *ntb)
394 {
395 return ntb_ndev(ntb)->db_valid_mask;
396 }
397
ntb_epf_db_set_mask(struct ntb_dev * ntb,u64 db_bits)398 static int ntb_epf_db_set_mask(struct ntb_dev *ntb, u64 db_bits)
399 {
400 return 0;
401 }
402
ntb_epf_mw_set_trans(struct ntb_dev * ntb,int pidx,int idx,dma_addr_t addr,resource_size_t size)403 static int ntb_epf_mw_set_trans(struct ntb_dev *ntb, int pidx, int idx,
404 dma_addr_t addr, resource_size_t size)
405 {
406 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
407 struct device *dev = ndev->dev;
408 resource_size_t mw_size;
409 int bar;
410
411 if (pidx != NTB_DEF_PEER_IDX) {
412 dev_err(dev, "Unsupported Peer ID %d\n", pidx);
413 return -EINVAL;
414 }
415
416 bar = idx + ndev->mw_bar;
417
418 mw_size = pci_resource_len(ntb->pdev, bar);
419
420 if (size > mw_size) {
421 dev_err(dev, "Size:%pa is greater than the MW size %pa\n",
422 &size, &mw_size);
423 return -EINVAL;
424 }
425
426 writel(lower_32_bits(addr), ndev->ctrl_reg + NTB_EPF_LOWER_ADDR);
427 writel(upper_32_bits(addr), ndev->ctrl_reg + NTB_EPF_UPPER_ADDR);
428 writel(lower_32_bits(size), ndev->ctrl_reg + NTB_EPF_LOWER_SIZE);
429 writel(upper_32_bits(size), ndev->ctrl_reg + NTB_EPF_UPPER_SIZE);
430 ntb_epf_send_command(ndev, CMD_CONFIGURE_MW, idx);
431
432 return 0;
433 }
434
ntb_epf_mw_clear_trans(struct ntb_dev * ntb,int pidx,int idx)435 static int ntb_epf_mw_clear_trans(struct ntb_dev *ntb, int pidx, int idx)
436 {
437 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
438 struct device *dev = ndev->dev;
439 int ret = 0;
440
441 ntb_epf_send_command(ndev, CMD_TEARDOWN_MW, idx);
442 if (ret)
443 dev_err(dev, "Failed to teardown memory window\n");
444
445 return ret;
446 }
447
ntb_epf_peer_mw_get_addr(struct ntb_dev * ntb,int idx,phys_addr_t * base,resource_size_t * size)448 static int ntb_epf_peer_mw_get_addr(struct ntb_dev *ntb, int idx,
449 phys_addr_t *base, resource_size_t *size)
450 {
451 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
452 u32 offset = 0;
453 int bar;
454
455 if (idx == 0)
456 offset = readl(ndev->ctrl_reg + NTB_EPF_MW1_OFFSET);
457
458 bar = idx + ndev->mw_bar;
459
460 if (base)
461 *base = pci_resource_start(ndev->ntb.pdev, bar) + offset;
462
463 if (size)
464 *size = pci_resource_len(ndev->ntb.pdev, bar) - offset;
465
466 return 0;
467 }
468
ntb_epf_peer_db_set(struct ntb_dev * ntb,u64 db_bits)469 static int ntb_epf_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
470 {
471 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
472 u32 interrupt_num = ffs(db_bits) + 1;
473 struct device *dev = ndev->dev;
474 u32 db_entry_size;
475 u32 db_offset;
476 u32 db_data;
477
478 if (interrupt_num > ndev->db_count) {
479 dev_err(dev, "DB interrupt %d greater than Max Supported %d\n",
480 interrupt_num, ndev->db_count);
481 return -EINVAL;
482 }
483
484 db_entry_size = readl(ndev->ctrl_reg + NTB_EPF_DB_ENTRY_SIZE);
485
486 db_data = readl(ndev->ctrl_reg + NTB_EPF_DB_DATA(interrupt_num));
487 db_offset = readl(ndev->ctrl_reg + NTB_EPF_DB_OFFSET(interrupt_num));
488 writel(db_data, ndev->db_reg + (db_entry_size * interrupt_num) +
489 db_offset);
490
491 return 0;
492 }
493
ntb_epf_db_read(struct ntb_dev * ntb)494 static u64 ntb_epf_db_read(struct ntb_dev *ntb)
495 {
496 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
497
498 return ndev->db_val;
499 }
500
ntb_epf_db_clear_mask(struct ntb_dev * ntb,u64 db_bits)501 static int ntb_epf_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
502 {
503 return 0;
504 }
505
ntb_epf_db_clear(struct ntb_dev * ntb,u64 db_bits)506 static int ntb_epf_db_clear(struct ntb_dev *ntb, u64 db_bits)
507 {
508 struct ntb_epf_dev *ndev = ntb_ndev(ntb);
509
510 ndev->db_val = 0;
511
512 return 0;
513 }
514
515 static const struct ntb_dev_ops ntb_epf_ops = {
516 .mw_count = ntb_epf_mw_count,
517 .spad_count = ntb_epf_spad_count,
518 .peer_mw_count = ntb_epf_peer_mw_count,
519 .db_valid_mask = ntb_epf_db_valid_mask,
520 .db_set_mask = ntb_epf_db_set_mask,
521 .mw_set_trans = ntb_epf_mw_set_trans,
522 .mw_clear_trans = ntb_epf_mw_clear_trans,
523 .peer_mw_get_addr = ntb_epf_peer_mw_get_addr,
524 .link_enable = ntb_epf_link_enable,
525 .spad_read = ntb_epf_spad_read,
526 .spad_write = ntb_epf_spad_write,
527 .peer_spad_read = ntb_epf_peer_spad_read,
528 .peer_spad_write = ntb_epf_peer_spad_write,
529 .peer_db_set = ntb_epf_peer_db_set,
530 .db_read = ntb_epf_db_read,
531 .mw_get_align = ntb_epf_mw_get_align,
532 .link_is_up = ntb_epf_link_is_up,
533 .db_clear_mask = ntb_epf_db_clear_mask,
534 .db_clear = ntb_epf_db_clear,
535 .link_disable = ntb_epf_link_disable,
536 };
537
ntb_epf_init_struct(struct ntb_epf_dev * ndev,struct pci_dev * pdev)538 static inline void ntb_epf_init_struct(struct ntb_epf_dev *ndev,
539 struct pci_dev *pdev)
540 {
541 ndev->ntb.pdev = pdev;
542 ndev->ntb.topo = NTB_TOPO_NONE;
543 ndev->ntb.ops = &ntb_epf_ops;
544 }
545
ntb_epf_init_dev(struct ntb_epf_dev * ndev)546 static int ntb_epf_init_dev(struct ntb_epf_dev *ndev)
547 {
548 struct device *dev = ndev->dev;
549 int ret;
550
551 /* One Link interrupt and rest doorbell interrupt */
552 ret = ntb_epf_init_isr(ndev, NTB_EPF_MIN_DB_COUNT + 1,
553 NTB_EPF_MAX_DB_COUNT + 1);
554 if (ret) {
555 dev_err(dev, "Failed to init ISR\n");
556 return ret;
557 }
558
559 ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1;
560 ndev->mw_count = readl(ndev->ctrl_reg + NTB_EPF_MW_COUNT);
561 ndev->spad_count = readl(ndev->ctrl_reg + NTB_EPF_SPAD_COUNT);
562
563 return 0;
564 }
565
ntb_epf_init_pci(struct ntb_epf_dev * ndev,struct pci_dev * pdev)566 static int ntb_epf_init_pci(struct ntb_epf_dev *ndev,
567 struct pci_dev *pdev)
568 {
569 struct device *dev = ndev->dev;
570 size_t spad_sz, spad_off;
571 int ret;
572
573 pci_set_drvdata(pdev, ndev);
574
575 ret = pci_enable_device(pdev);
576 if (ret) {
577 dev_err(dev, "Cannot enable PCI device\n");
578 goto err_pci_enable;
579 }
580
581 ret = pci_request_regions(pdev, "ntb");
582 if (ret) {
583 dev_err(dev, "Cannot obtain PCI resources\n");
584 goto err_pci_regions;
585 }
586
587 pci_set_master(pdev);
588
589 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
590 if (ret) {
591 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
592 if (ret) {
593 dev_err(dev, "Cannot set DMA mask\n");
594 goto err_pci_regions;
595 }
596 dev_warn(&pdev->dev, "Cannot DMA highmem\n");
597 }
598
599 ndev->ctrl_reg = pci_iomap(pdev, ndev->ctrl_reg_bar, 0);
600 if (!ndev->ctrl_reg) {
601 ret = -EIO;
602 goto err_pci_regions;
603 }
604
605 if (ndev->peer_spad_reg_bar) {
606 ndev->peer_spad_reg = pci_iomap(pdev, ndev->peer_spad_reg_bar, 0);
607 if (!ndev->peer_spad_reg) {
608 ret = -EIO;
609 goto err_pci_regions;
610 }
611 } else {
612 spad_sz = 4 * readl(ndev->ctrl_reg + NTB_EPF_SPAD_COUNT);
613 spad_off = readl(ndev->ctrl_reg + NTB_EPF_SPAD_OFFSET);
614 ndev->peer_spad_reg = ndev->ctrl_reg + spad_off + spad_sz;
615 }
616
617 ndev->db_reg = pci_iomap(pdev, ndev->db_reg_bar, 0);
618 if (!ndev->db_reg) {
619 ret = -EIO;
620 goto err_pci_regions;
621 }
622
623 return 0;
624
625 err_pci_regions:
626 pci_disable_device(pdev);
627
628 err_pci_enable:
629 pci_set_drvdata(pdev, NULL);
630
631 return ret;
632 }
633
ntb_epf_deinit_pci(struct ntb_epf_dev * ndev)634 static void ntb_epf_deinit_pci(struct ntb_epf_dev *ndev)
635 {
636 struct pci_dev *pdev = ndev->ntb.pdev;
637
638 pci_iounmap(pdev, ndev->ctrl_reg);
639 pci_iounmap(pdev, ndev->peer_spad_reg);
640 pci_iounmap(pdev, ndev->db_reg);
641
642 pci_release_regions(pdev);
643 pci_disable_device(pdev);
644 pci_set_drvdata(pdev, NULL);
645 }
646
ntb_epf_cleanup_isr(struct ntb_epf_dev * ndev)647 static void ntb_epf_cleanup_isr(struct ntb_epf_dev *ndev)
648 {
649 struct pci_dev *pdev = ndev->ntb.pdev;
650 int i;
651
652 ntb_epf_send_command(ndev, CMD_TEARDOWN_DOORBELL, ndev->db_count + 1);
653
654 for (i = 0; i < ndev->db_count + 1; i++)
655 free_irq(pci_irq_vector(pdev, i), ndev);
656 pci_free_irq_vectors(pdev);
657 }
658
ntb_epf_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)659 static int ntb_epf_pci_probe(struct pci_dev *pdev,
660 const struct pci_device_id *id)
661 {
662 enum pci_barno peer_spad_reg_bar = BAR_1;
663 enum pci_barno ctrl_reg_bar = BAR_0;
664 enum pci_barno db_reg_bar = BAR_2;
665 enum pci_barno mw_bar = BAR_2;
666 struct device *dev = &pdev->dev;
667 struct ntb_epf_data *data;
668 struct ntb_epf_dev *ndev;
669 int ret;
670
671 if (pci_is_bridge(pdev))
672 return -ENODEV;
673
674 ndev = devm_kzalloc(dev, sizeof(*ndev), GFP_KERNEL);
675 if (!ndev)
676 return -ENOMEM;
677
678 data = (struct ntb_epf_data *)id->driver_data;
679 if (data) {
680 peer_spad_reg_bar = data->peer_spad_reg_bar;
681 ctrl_reg_bar = data->ctrl_reg_bar;
682 db_reg_bar = data->db_reg_bar;
683 mw_bar = data->mw_bar;
684 }
685
686 ndev->peer_spad_reg_bar = peer_spad_reg_bar;
687 ndev->ctrl_reg_bar = ctrl_reg_bar;
688 ndev->db_reg_bar = db_reg_bar;
689 ndev->mw_bar = mw_bar;
690 ndev->dev = dev;
691
692 ntb_epf_init_struct(ndev, pdev);
693 mutex_init(&ndev->cmd_lock);
694
695 ret = ntb_epf_init_pci(ndev, pdev);
696 if (ret) {
697 dev_err(dev, "Failed to init PCI\n");
698 return ret;
699 }
700
701 ret = ntb_epf_init_dev(ndev);
702 if (ret) {
703 dev_err(dev, "Failed to init device\n");
704 goto err_init_dev;
705 }
706
707 ret = ntb_register_device(&ndev->ntb);
708 if (ret) {
709 dev_err(dev, "Failed to register NTB device\n");
710 goto err_register_dev;
711 }
712
713 return 0;
714
715 err_register_dev:
716 ntb_epf_cleanup_isr(ndev);
717
718 err_init_dev:
719 ntb_epf_deinit_pci(ndev);
720
721 return ret;
722 }
723
ntb_epf_pci_remove(struct pci_dev * pdev)724 static void ntb_epf_pci_remove(struct pci_dev *pdev)
725 {
726 struct ntb_epf_dev *ndev = pci_get_drvdata(pdev);
727
728 ntb_unregister_device(&ndev->ntb);
729 ntb_epf_cleanup_isr(ndev);
730 ntb_epf_deinit_pci(ndev);
731 }
732
733 static const struct ntb_epf_data j721e_data = {
734 .ctrl_reg_bar = BAR_0,
735 .peer_spad_reg_bar = BAR_1,
736 .db_reg_bar = BAR_2,
737 .mw_bar = BAR_2,
738 };
739
740 static const struct ntb_epf_data mx8_data = {
741 .ctrl_reg_bar = BAR_0,
742 .peer_spad_reg_bar = BAR_0,
743 .db_reg_bar = BAR_2,
744 .mw_bar = BAR_4,
745 };
746
747 static const struct pci_device_id ntb_epf_pci_tbl[] = {
748 {
749 PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_J721E),
750 .class = PCI_CLASS_MEMORY_RAM << 8, .class_mask = 0xffff00,
751 .driver_data = (kernel_ulong_t)&j721e_data,
752 },
753 {
754 PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, 0x0809),
755 .class = PCI_CLASS_MEMORY_RAM << 8, .class_mask = 0xffff00,
756 .driver_data = (kernel_ulong_t)&mx8_data,
757 },
758 { },
759 };
760
761 static struct pci_driver ntb_epf_pci_driver = {
762 .name = KBUILD_MODNAME,
763 .id_table = ntb_epf_pci_tbl,
764 .probe = ntb_epf_pci_probe,
765 .remove = ntb_epf_pci_remove,
766 };
767 module_pci_driver(ntb_epf_pci_driver);
768
769 MODULE_DESCRIPTION("PCI ENDPOINT NTB HOST DRIVER");
770 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
771 MODULE_LICENSE("GPL v2");
772