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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCIe host controller driver for Xilinx Versal CPM DMA Bridge
4 *
5 * (C) Copyright 2019 - 2020, Xilinx, Inc.
6 */
7
8#include <linux/bitfield.h>
9#include <linux/interrupt.h>
10#include <linux/irq.h>
11#include <linux/irqchip.h>
12#include <linux/irqchip/chained_irq.h>
13#include <linux/irqdomain.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of_address.h>
17#include <linux/of_pci.h>
18#include <linux/of_platform.h>
19
20#include "../pci.h"
21#include "pcie-xilinx-common.h"
22
23/* Register definitions */
24#define XILINX_CPM_PCIE_REG_IDR 0x00000E10
25#define XILINX_CPM_PCIE_REG_IMR 0x00000E14
26#define XILINX_CPM_PCIE_REG_PSCR 0x00000E1C
27#define XILINX_CPM_PCIE_REG_RPSC 0x00000E20
28#define XILINX_CPM_PCIE_REG_RPEFR 0x00000E2C
29#define XILINX_CPM_PCIE_REG_IDRN 0x00000E38
30#define XILINX_CPM_PCIE_REG_IDRN_MASK 0x00000E3C
31#define XILINX_CPM_PCIE_MISC_IR_STATUS 0x00000340
32#define XILINX_CPM_PCIE_MISC_IR_ENABLE 0x00000348
33#define XILINX_CPM_PCIE_MISC_IR_LOCAL BIT(1)
34
35#define XILINX_CPM_PCIE_IR_STATUS 0x000002A0
36#define XILINX_CPM_PCIE_IR_ENABLE 0x000002A8
37#define XILINX_CPM_PCIE_IR_LOCAL BIT(0)
38
39#define IMR(x) BIT(XILINX_PCIE_INTR_ ##x)
40
41#define XILINX_CPM_PCIE_IMR_ALL_MASK \
42 ( \
43 IMR(LINK_DOWN) | \
44 IMR(HOT_RESET) | \
45 IMR(CFG_PCIE_TIMEOUT) | \
46 IMR(CFG_TIMEOUT) | \
47 IMR(CORRECTABLE) | \
48 IMR(NONFATAL) | \
49 IMR(FATAL) | \
50 IMR(CFG_ERR_POISON) | \
51 IMR(PME_TO_ACK_RCVD) | \
52 IMR(INTX) | \
53 IMR(PM_PME_RCVD) | \
54 IMR(SLV_UNSUPP) | \
55 IMR(SLV_UNEXP) | \
56 IMR(SLV_COMPL) | \
57 IMR(SLV_ERRP) | \
58 IMR(SLV_CMPABT) | \
59 IMR(SLV_ILLBUR) | \
60 IMR(MST_DECERR) | \
61 IMR(MST_SLVERR) | \
62 IMR(SLV_PCIE_TIMEOUT) \
63 )
64
65#define XILINX_CPM_PCIE_IDR_ALL_MASK 0xFFFFFFFF
66#define XILINX_CPM_PCIE_IDRN_MASK GENMASK(19, 16)
67#define XILINX_CPM_PCIE_IDRN_SHIFT 16
68
69/* Root Port Error FIFO Read Register definitions */
70#define XILINX_CPM_PCIE_RPEFR_ERR_VALID BIT(18)
71#define XILINX_CPM_PCIE_RPEFR_REQ_ID GENMASK(15, 0)
72#define XILINX_CPM_PCIE_RPEFR_ALL_MASK 0xFFFFFFFF
73
74/* Root Port Status/control Register definitions */
75#define XILINX_CPM_PCIE_REG_RPSC_BEN BIT(0)
76
77/* Phy Status/Control Register definitions */
78#define XILINX_CPM_PCIE_REG_PSCR_LNKUP BIT(11)
79
80enum xilinx_cpm_version {
81 CPM,
82 CPM5,
83};
84
85/**
86 * struct xilinx_cpm_variant - CPM variant information
87 * @version: CPM version
88 */
89struct xilinx_cpm_variant {
90 enum xilinx_cpm_version version;
91};
92
93/**
94 * struct xilinx_cpm_pcie - PCIe port information
95 * @dev: Device pointer
96 * @reg_base: Bridge Register Base
97 * @cpm_base: CPM System Level Control and Status Register(SLCR) Base
98 * @intx_domain: Legacy IRQ domain pointer
99 * @cpm_domain: CPM IRQ domain pointer
100 * @cfg: Holds mappings of config space window
101 * @intx_irq: legacy interrupt number
102 * @irq: Error interrupt number
103 * @lock: lock protecting shared register access
104 * @variant: CPM version check pointer
105 */
106struct xilinx_cpm_pcie {
107 struct device *dev;
108 void __iomem *reg_base;
109 void __iomem *cpm_base;
110 struct irq_domain *intx_domain;
111 struct irq_domain *cpm_domain;
112 struct pci_config_window *cfg;
113 int intx_irq;
114 int irq;
115 raw_spinlock_t lock;
116 const struct xilinx_cpm_variant *variant;
117};
118
119static u32 pcie_read(struct xilinx_cpm_pcie *port, u32 reg)
120{
121 return readl_relaxed(port->reg_base + reg);
122}
123
124static void pcie_write(struct xilinx_cpm_pcie *port,
125 u32 val, u32 reg)
126{
127 writel_relaxed(val, port->reg_base + reg);
128}
129
130static bool cpm_pcie_link_up(struct xilinx_cpm_pcie *port)
131{
132 return (pcie_read(port, XILINX_CPM_PCIE_REG_PSCR) &
133 XILINX_CPM_PCIE_REG_PSCR_LNKUP);
134}
135
136static void cpm_pcie_clear_err_interrupts(struct xilinx_cpm_pcie *port)
137{
138 unsigned long val = pcie_read(port, XILINX_CPM_PCIE_REG_RPEFR);
139
140 if (val & XILINX_CPM_PCIE_RPEFR_ERR_VALID) {
141 dev_dbg(port->dev, "Requester ID %lu\n",
142 val & XILINX_CPM_PCIE_RPEFR_REQ_ID);
143 pcie_write(port, XILINX_CPM_PCIE_RPEFR_ALL_MASK,
144 XILINX_CPM_PCIE_REG_RPEFR);
145 }
146}
147
148static void xilinx_cpm_mask_leg_irq(struct irq_data *data)
149{
150 struct xilinx_cpm_pcie *port = irq_data_get_irq_chip_data(data);
151 unsigned long flags;
152 u32 mask;
153 u32 val;
154
155 mask = BIT(data->hwirq + XILINX_CPM_PCIE_IDRN_SHIFT);
156 raw_spin_lock_irqsave(&port->lock, flags);
157 val = pcie_read(port, XILINX_CPM_PCIE_REG_IDRN_MASK);
158 pcie_write(port, (val & (~mask)), XILINX_CPM_PCIE_REG_IDRN_MASK);
159 raw_spin_unlock_irqrestore(&port->lock, flags);
160}
161
162static void xilinx_cpm_unmask_leg_irq(struct irq_data *data)
163{
164 struct xilinx_cpm_pcie *port = irq_data_get_irq_chip_data(data);
165 unsigned long flags;
166 u32 mask;
167 u32 val;
168
169 mask = BIT(data->hwirq + XILINX_CPM_PCIE_IDRN_SHIFT);
170 raw_spin_lock_irqsave(&port->lock, flags);
171 val = pcie_read(port, XILINX_CPM_PCIE_REG_IDRN_MASK);
172 pcie_write(port, (val | mask), XILINX_CPM_PCIE_REG_IDRN_MASK);
173 raw_spin_unlock_irqrestore(&port->lock, flags);
174}
175
176static struct irq_chip xilinx_cpm_leg_irq_chip = {
177 .name = "INTx",
178 .irq_mask = xilinx_cpm_mask_leg_irq,
179 .irq_unmask = xilinx_cpm_unmask_leg_irq,
180};
181
182/**
183 * xilinx_cpm_pcie_intx_map - Set the handler for the INTx and mark IRQ as valid
184 * @domain: IRQ domain
185 * @irq: Virtual IRQ number
186 * @hwirq: HW interrupt number
187 *
188 * Return: Always returns 0.
189 */
190static int xilinx_cpm_pcie_intx_map(struct irq_domain *domain,
191 unsigned int irq, irq_hw_number_t hwirq)
192{
193 irq_set_chip_and_handler(irq, &xilinx_cpm_leg_irq_chip,
194 handle_level_irq);
195 irq_set_chip_data(irq, domain->host_data);
196 irq_set_status_flags(irq, IRQ_LEVEL);
197
198 return 0;
199}
200
201/* INTx IRQ Domain operations */
202static const struct irq_domain_ops intx_domain_ops = {
203 .map = xilinx_cpm_pcie_intx_map,
204};
205
206static void xilinx_cpm_pcie_intx_flow(struct irq_desc *desc)
207{
208 struct xilinx_cpm_pcie *port = irq_desc_get_handler_data(desc);
209 struct irq_chip *chip = irq_desc_get_chip(desc);
210 unsigned long val;
211 int i;
212
213 chained_irq_enter(chip, desc);
214
215 val = FIELD_GET(XILINX_CPM_PCIE_IDRN_MASK,
216 pcie_read(port, XILINX_CPM_PCIE_REG_IDRN));
217
218 for_each_set_bit(i, &val, PCI_NUM_INTX)
219 generic_handle_domain_irq(port->intx_domain, i);
220
221 chained_irq_exit(chip, desc);
222}
223
224static void xilinx_cpm_mask_event_irq(struct irq_data *d)
225{
226 struct xilinx_cpm_pcie *port = irq_data_get_irq_chip_data(d);
227 u32 val;
228
229 raw_spin_lock(&port->lock);
230 val = pcie_read(port, XILINX_CPM_PCIE_REG_IMR);
231 val &= ~BIT(d->hwirq);
232 pcie_write(port, val, XILINX_CPM_PCIE_REG_IMR);
233 raw_spin_unlock(&port->lock);
234}
235
236static void xilinx_cpm_unmask_event_irq(struct irq_data *d)
237{
238 struct xilinx_cpm_pcie *port = irq_data_get_irq_chip_data(d);
239 u32 val;
240
241 raw_spin_lock(&port->lock);
242 val = pcie_read(port, XILINX_CPM_PCIE_REG_IMR);
243 val |= BIT(d->hwirq);
244 pcie_write(port, val, XILINX_CPM_PCIE_REG_IMR);
245 raw_spin_unlock(&port->lock);
246}
247
248static struct irq_chip xilinx_cpm_event_irq_chip = {
249 .name = "RC-Event",
250 .irq_mask = xilinx_cpm_mask_event_irq,
251 .irq_unmask = xilinx_cpm_unmask_event_irq,
252};
253
254static int xilinx_cpm_pcie_event_map(struct irq_domain *domain,
255 unsigned int irq, irq_hw_number_t hwirq)
256{
257 irq_set_chip_and_handler(irq, &xilinx_cpm_event_irq_chip,
258 handle_level_irq);
259 irq_set_chip_data(irq, domain->host_data);
260 irq_set_status_flags(irq, IRQ_LEVEL);
261 return 0;
262}
263
264static const struct irq_domain_ops event_domain_ops = {
265 .map = xilinx_cpm_pcie_event_map,
266};
267
268static void xilinx_cpm_pcie_event_flow(struct irq_desc *desc)
269{
270 struct xilinx_cpm_pcie *port = irq_desc_get_handler_data(desc);
271 struct irq_chip *chip = irq_desc_get_chip(desc);
272 unsigned long val;
273 int i;
274
275 chained_irq_enter(chip, desc);
276 val = pcie_read(port, XILINX_CPM_PCIE_REG_IDR);
277 val &= pcie_read(port, XILINX_CPM_PCIE_REG_IMR);
278 for_each_set_bit(i, &val, 32)
279 generic_handle_domain_irq(port->cpm_domain, i);
280 pcie_write(port, val, XILINX_CPM_PCIE_REG_IDR);
281
282 if (port->variant->version == CPM5) {
283 val = readl_relaxed(port->cpm_base + XILINX_CPM_PCIE_IR_STATUS);
284 if (val)
285 writel_relaxed(val, port->cpm_base +
286 XILINX_CPM_PCIE_IR_STATUS);
287 }
288
289 /*
290 * XILINX_CPM_PCIE_MISC_IR_STATUS register is mapped to
291 * CPM SLCR block.
292 */
293 val = readl_relaxed(port->cpm_base + XILINX_CPM_PCIE_MISC_IR_STATUS);
294 if (val)
295 writel_relaxed(val,
296 port->cpm_base + XILINX_CPM_PCIE_MISC_IR_STATUS);
297
298 chained_irq_exit(chip, desc);
299}
300
301#define _IC(x, s) \
302 [XILINX_PCIE_INTR_ ## x] = { __stringify(x), s }
303
304static const struct {
305 const char *sym;
306 const char *str;
307} intr_cause[32] = {
308 _IC(LINK_DOWN, "Link Down"),
309 _IC(HOT_RESET, "Hot reset"),
310 _IC(CFG_TIMEOUT, "ECAM access timeout"),
311 _IC(CORRECTABLE, "Correctable error message"),
312 _IC(NONFATAL, "Non fatal error message"),
313 _IC(FATAL, "Fatal error message"),
314 _IC(SLV_UNSUPP, "Slave unsupported request"),
315 _IC(SLV_UNEXP, "Slave unexpected completion"),
316 _IC(SLV_COMPL, "Slave completion timeout"),
317 _IC(SLV_ERRP, "Slave Error Poison"),
318 _IC(SLV_CMPABT, "Slave Completer Abort"),
319 _IC(SLV_ILLBUR, "Slave Illegal Burst"),
320 _IC(MST_DECERR, "Master decode error"),
321 _IC(MST_SLVERR, "Master slave error"),
322 _IC(CFG_PCIE_TIMEOUT, "PCIe ECAM access timeout"),
323 _IC(CFG_ERR_POISON, "ECAM poisoned completion received"),
324 _IC(PME_TO_ACK_RCVD, "PME_TO_ACK message received"),
325 _IC(PM_PME_RCVD, "PM_PME message received"),
326 _IC(SLV_PCIE_TIMEOUT, "PCIe completion timeout received"),
327};
328
329static irqreturn_t xilinx_cpm_pcie_intr_handler(int irq, void *dev_id)
330{
331 struct xilinx_cpm_pcie *port = dev_id;
332 struct device *dev = port->dev;
333 struct irq_data *d;
334
335 d = irq_domain_get_irq_data(port->cpm_domain, irq);
336
337 switch (d->hwirq) {
338 case XILINX_PCIE_INTR_CORRECTABLE:
339 case XILINX_PCIE_INTR_NONFATAL:
340 case XILINX_PCIE_INTR_FATAL:
341 cpm_pcie_clear_err_interrupts(port);
342 fallthrough;
343
344 default:
345 if (intr_cause[d->hwirq].str)
346 dev_warn(dev, "%s\n", intr_cause[d->hwirq].str);
347 else
348 dev_warn(dev, "Unknown IRQ %ld\n", d->hwirq);
349 }
350
351 return IRQ_HANDLED;
352}
353
354static void xilinx_cpm_free_irq_domains(struct xilinx_cpm_pcie *port)
355{
356 if (port->intx_domain) {
357 irq_domain_remove(port->intx_domain);
358 port->intx_domain = NULL;
359 }
360
361 if (port->cpm_domain) {
362 irq_domain_remove(port->cpm_domain);
363 port->cpm_domain = NULL;
364 }
365}
366
367/**
368 * xilinx_cpm_pcie_init_irq_domain - Initialize IRQ domain
369 * @port: PCIe port information
370 *
371 * Return: '0' on success and error value on failure
372 */
373static int xilinx_cpm_pcie_init_irq_domain(struct xilinx_cpm_pcie *port)
374{
375 struct device *dev = port->dev;
376 struct device_node *node = dev->of_node;
377 struct device_node *pcie_intc_node;
378
379 /* Setup INTx */
380 pcie_intc_node = of_get_next_child(node, NULL);
381 if (!pcie_intc_node) {
382 dev_err(dev, "No PCIe Intc node found\n");
383 return -EINVAL;
384 }
385
386 port->cpm_domain = irq_domain_add_linear(pcie_intc_node, 32,
387 &event_domain_ops,
388 port);
389 if (!port->cpm_domain)
390 goto out;
391
392 irq_domain_update_bus_token(port->cpm_domain, DOMAIN_BUS_NEXUS);
393
394 port->intx_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
395 &intx_domain_ops,
396 port);
397 if (!port->intx_domain)
398 goto out;
399
400 irq_domain_update_bus_token(port->intx_domain, DOMAIN_BUS_WIRED);
401
402 of_node_put(pcie_intc_node);
403 raw_spin_lock_init(&port->lock);
404
405 return 0;
406out:
407 xilinx_cpm_free_irq_domains(port);
408 of_node_put(pcie_intc_node);
409 dev_err(dev, "Failed to allocate IRQ domains\n");
410
411 return -ENOMEM;
412}
413
414static int xilinx_cpm_setup_irq(struct xilinx_cpm_pcie *port)
415{
416 struct device *dev = port->dev;
417 struct platform_device *pdev = to_platform_device(dev);
418 int i, irq;
419
420 port->irq = platform_get_irq(pdev, 0);
421 if (port->irq < 0)
422 return port->irq;
423
424 for (i = 0; i < ARRAY_SIZE(intr_cause); i++) {
425 int err;
426
427 if (!intr_cause[i].str)
428 continue;
429
430 irq = irq_create_mapping(port->cpm_domain, i);
431 if (!irq) {
432 dev_err(dev, "Failed to map interrupt\n");
433 return -ENXIO;
434 }
435
436 err = devm_request_irq(dev, irq, xilinx_cpm_pcie_intr_handler,
437 0, intr_cause[i].sym, port);
438 if (err) {
439 dev_err(dev, "Failed to request IRQ %d\n", irq);
440 return err;
441 }
442 }
443
444 port->intx_irq = irq_create_mapping(port->cpm_domain,
445 XILINX_PCIE_INTR_INTX);
446 if (!port->intx_irq) {
447 dev_err(dev, "Failed to map INTx interrupt\n");
448 return -ENXIO;
449 }
450
451 /* Plug the INTx chained handler */
452 irq_set_chained_handler_and_data(port->intx_irq,
453 xilinx_cpm_pcie_intx_flow, port);
454
455 /* Plug the main event chained handler */
456 irq_set_chained_handler_and_data(port->irq,
457 xilinx_cpm_pcie_event_flow, port);
458
459 return 0;
460}
461
462/**
463 * xilinx_cpm_pcie_init_port - Initialize hardware
464 * @port: PCIe port information
465 */
466static void xilinx_cpm_pcie_init_port(struct xilinx_cpm_pcie *port)
467{
468 if (cpm_pcie_link_up(port))
469 dev_info(port->dev, "PCIe Link is UP\n");
470 else
471 dev_info(port->dev, "PCIe Link is DOWN\n");
472
473 /* Disable all interrupts */
474 pcie_write(port, ~XILINX_CPM_PCIE_IDR_ALL_MASK,
475 XILINX_CPM_PCIE_REG_IMR);
476
477 /* Clear pending interrupts */
478 pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_IDR) &
479 XILINX_CPM_PCIE_IMR_ALL_MASK,
480 XILINX_CPM_PCIE_REG_IDR);
481
482 /*
483 * XILINX_CPM_PCIE_MISC_IR_ENABLE register is mapped to
484 * CPM SLCR block.
485 */
486 writel(XILINX_CPM_PCIE_MISC_IR_LOCAL,
487 port->cpm_base + XILINX_CPM_PCIE_MISC_IR_ENABLE);
488
489 if (port->variant->version == CPM5) {
490 writel(XILINX_CPM_PCIE_IR_LOCAL,
491 port->cpm_base + XILINX_CPM_PCIE_IR_ENABLE);
492 }
493
494 /* Enable the Bridge enable bit */
495 pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_RPSC) |
496 XILINX_CPM_PCIE_REG_RPSC_BEN,
497 XILINX_CPM_PCIE_REG_RPSC);
498}
499
500/**
501 * xilinx_cpm_pcie_parse_dt - Parse Device tree
502 * @port: PCIe port information
503 * @bus_range: Bus resource
504 *
505 * Return: '0' on success and error value on failure
506 */
507static int xilinx_cpm_pcie_parse_dt(struct xilinx_cpm_pcie *port,
508 struct resource *bus_range)
509{
510 struct device *dev = port->dev;
511 struct platform_device *pdev = to_platform_device(dev);
512 struct resource *res;
513
514 port->cpm_base = devm_platform_ioremap_resource_byname(pdev,
515 "cpm_slcr");
516 if (IS_ERR(port->cpm_base))
517 return PTR_ERR(port->cpm_base);
518
519 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
520 if (!res)
521 return -ENXIO;
522
523 port->cfg = pci_ecam_create(dev, res, bus_range,
524 &pci_generic_ecam_ops);
525 if (IS_ERR(port->cfg))
526 return PTR_ERR(port->cfg);
527
528 if (port->variant->version == CPM5) {
529 port->reg_base = devm_platform_ioremap_resource_byname(pdev,
530 "cpm_csr");
531 if (IS_ERR(port->reg_base))
532 return PTR_ERR(port->reg_base);
533 } else {
534 port->reg_base = port->cfg->win;
535 }
536
537 return 0;
538}
539
540static void xilinx_cpm_free_interrupts(struct xilinx_cpm_pcie *port)
541{
542 irq_set_chained_handler_and_data(port->intx_irq, NULL, NULL);
543 irq_set_chained_handler_and_data(port->irq, NULL, NULL);
544}
545
546/**
547 * xilinx_cpm_pcie_probe - Probe function
548 * @pdev: Platform device pointer
549 *
550 * Return: '0' on success and error value on failure
551 */
552static int xilinx_cpm_pcie_probe(struct platform_device *pdev)
553{
554 struct xilinx_cpm_pcie *port;
555 struct device *dev = &pdev->dev;
556 struct pci_host_bridge *bridge;
557 struct resource_entry *bus;
558 int err;
559
560 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
561 if (!bridge)
562 return -ENODEV;
563
564 port = pci_host_bridge_priv(bridge);
565
566 port->dev = dev;
567
568 err = xilinx_cpm_pcie_init_irq_domain(port);
569 if (err)
570 return err;
571
572 bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
573 if (!bus)
574 return -ENODEV;
575
576 port->variant = of_device_get_match_data(dev);
577
578 err = xilinx_cpm_pcie_parse_dt(port, bus->res);
579 if (err) {
580 dev_err(dev, "Parsing DT failed\n");
581 goto err_parse_dt;
582 }
583
584 xilinx_cpm_pcie_init_port(port);
585
586 err = xilinx_cpm_setup_irq(port);
587 if (err) {
588 dev_err(dev, "Failed to set up interrupts\n");
589 goto err_setup_irq;
590 }
591
592 bridge->sysdata = port->cfg;
593 bridge->ops = (struct pci_ops *)&pci_generic_ecam_ops.pci_ops;
594
595 err = pci_host_probe(bridge);
596 if (err < 0)
597 goto err_host_bridge;
598
599 return 0;
600
601err_host_bridge:
602 xilinx_cpm_free_interrupts(port);
603err_setup_irq:
604 pci_ecam_free(port->cfg);
605err_parse_dt:
606 xilinx_cpm_free_irq_domains(port);
607 return err;
608}
609
610static const struct xilinx_cpm_variant cpm_host = {
611 .version = CPM,
612};
613
614static const struct xilinx_cpm_variant cpm5_host = {
615 .version = CPM5,
616};
617
618static const struct of_device_id xilinx_cpm_pcie_of_match[] = {
619 {
620 .compatible = "xlnx,versal-cpm-host-1.00",
621 .data = &cpm_host,
622 },
623 {
624 .compatible = "xlnx,versal-cpm5-host",
625 .data = &cpm5_host,
626 },
627 {}
628};
629
630static struct platform_driver xilinx_cpm_pcie_driver = {
631 .driver = {
632 .name = "xilinx-cpm-pcie",
633 .of_match_table = xilinx_cpm_pcie_of_match,
634 .suppress_bind_attrs = true,
635 },
636 .probe = xilinx_cpm_pcie_probe,
637};
638
639builtin_platform_driver(xilinx_cpm_pcie_driver);
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCIe host controller driver for Xilinx Versal CPM DMA Bridge
4 *
5 * (C) Copyright 2019 - 2020, Xilinx, Inc.
6 */
7
8#include <linux/bitfield.h>
9#include <linux/interrupt.h>
10#include <linux/irq.h>
11#include <linux/irqchip.h>
12#include <linux/irqchip/chained_irq.h>
13#include <linux/irqdomain.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of_address.h>
17#include <linux/of_pci.h>
18#include <linux/of_platform.h>
19#include <linux/pci.h>
20#include <linux/platform_device.h>
21#include <linux/pci-ecam.h>
22
23#include "../pci.h"
24
25/* Register definitions */
26#define XILINX_CPM_PCIE_REG_IDR 0x00000E10
27#define XILINX_CPM_PCIE_REG_IMR 0x00000E14
28#define XILINX_CPM_PCIE_REG_PSCR 0x00000E1C
29#define XILINX_CPM_PCIE_REG_RPSC 0x00000E20
30#define XILINX_CPM_PCIE_REG_RPEFR 0x00000E2C
31#define XILINX_CPM_PCIE_REG_IDRN 0x00000E38
32#define XILINX_CPM_PCIE_REG_IDRN_MASK 0x00000E3C
33#define XILINX_CPM_PCIE_MISC_IR_STATUS 0x00000340
34#define XILINX_CPM_PCIE_MISC_IR_ENABLE 0x00000348
35#define XILINX_CPM_PCIE_MISC_IR_LOCAL BIT(1)
36
37#define XILINX_CPM_PCIE_IR_STATUS 0x000002A0
38#define XILINX_CPM_PCIE_IR_ENABLE 0x000002A8
39#define XILINX_CPM_PCIE_IR_LOCAL BIT(0)
40
41/* Interrupt registers definitions */
42#define XILINX_CPM_PCIE_INTR_LINK_DOWN 0
43#define XILINX_CPM_PCIE_INTR_HOT_RESET 3
44#define XILINX_CPM_PCIE_INTR_CFG_PCIE_TIMEOUT 4
45#define XILINX_CPM_PCIE_INTR_CFG_TIMEOUT 8
46#define XILINX_CPM_PCIE_INTR_CORRECTABLE 9
47#define XILINX_CPM_PCIE_INTR_NONFATAL 10
48#define XILINX_CPM_PCIE_INTR_FATAL 11
49#define XILINX_CPM_PCIE_INTR_CFG_ERR_POISON 12
50#define XILINX_CPM_PCIE_INTR_PME_TO_ACK_RCVD 15
51#define XILINX_CPM_PCIE_INTR_INTX 16
52#define XILINX_CPM_PCIE_INTR_PM_PME_RCVD 17
53#define XILINX_CPM_PCIE_INTR_SLV_UNSUPP 20
54#define XILINX_CPM_PCIE_INTR_SLV_UNEXP 21
55#define XILINX_CPM_PCIE_INTR_SLV_COMPL 22
56#define XILINX_CPM_PCIE_INTR_SLV_ERRP 23
57#define XILINX_CPM_PCIE_INTR_SLV_CMPABT 24
58#define XILINX_CPM_PCIE_INTR_SLV_ILLBUR 25
59#define XILINX_CPM_PCIE_INTR_MST_DECERR 26
60#define XILINX_CPM_PCIE_INTR_MST_SLVERR 27
61#define XILINX_CPM_PCIE_INTR_SLV_PCIE_TIMEOUT 28
62
63#define IMR(x) BIT(XILINX_CPM_PCIE_INTR_ ##x)
64
65#define XILINX_CPM_PCIE_IMR_ALL_MASK \
66 ( \
67 IMR(LINK_DOWN) | \
68 IMR(HOT_RESET) | \
69 IMR(CFG_PCIE_TIMEOUT) | \
70 IMR(CFG_TIMEOUT) | \
71 IMR(CORRECTABLE) | \
72 IMR(NONFATAL) | \
73 IMR(FATAL) | \
74 IMR(CFG_ERR_POISON) | \
75 IMR(PME_TO_ACK_RCVD) | \
76 IMR(INTX) | \
77 IMR(PM_PME_RCVD) | \
78 IMR(SLV_UNSUPP) | \
79 IMR(SLV_UNEXP) | \
80 IMR(SLV_COMPL) | \
81 IMR(SLV_ERRP) | \
82 IMR(SLV_CMPABT) | \
83 IMR(SLV_ILLBUR) | \
84 IMR(MST_DECERR) | \
85 IMR(MST_SLVERR) | \
86 IMR(SLV_PCIE_TIMEOUT) \
87 )
88
89#define XILINX_CPM_PCIE_IDR_ALL_MASK 0xFFFFFFFF
90#define XILINX_CPM_PCIE_IDRN_MASK GENMASK(19, 16)
91#define XILINX_CPM_PCIE_IDRN_SHIFT 16
92
93/* Root Port Error FIFO Read Register definitions */
94#define XILINX_CPM_PCIE_RPEFR_ERR_VALID BIT(18)
95#define XILINX_CPM_PCIE_RPEFR_REQ_ID GENMASK(15, 0)
96#define XILINX_CPM_PCIE_RPEFR_ALL_MASK 0xFFFFFFFF
97
98/* Root Port Status/control Register definitions */
99#define XILINX_CPM_PCIE_REG_RPSC_BEN BIT(0)
100
101/* Phy Status/Control Register definitions */
102#define XILINX_CPM_PCIE_REG_PSCR_LNKUP BIT(11)
103
104enum xilinx_cpm_version {
105 CPM,
106 CPM5,
107};
108
109/**
110 * struct xilinx_cpm_variant - CPM variant information
111 * @version: CPM version
112 */
113struct xilinx_cpm_variant {
114 enum xilinx_cpm_version version;
115};
116
117/**
118 * struct xilinx_cpm_pcie - PCIe port information
119 * @dev: Device pointer
120 * @reg_base: Bridge Register Base
121 * @cpm_base: CPM System Level Control and Status Register(SLCR) Base
122 * @intx_domain: Legacy IRQ domain pointer
123 * @cpm_domain: CPM IRQ domain pointer
124 * @cfg: Holds mappings of config space window
125 * @intx_irq: legacy interrupt number
126 * @irq: Error interrupt number
127 * @lock: lock protecting shared register access
128 * @variant: CPM version check pointer
129 */
130struct xilinx_cpm_pcie {
131 struct device *dev;
132 void __iomem *reg_base;
133 void __iomem *cpm_base;
134 struct irq_domain *intx_domain;
135 struct irq_domain *cpm_domain;
136 struct pci_config_window *cfg;
137 int intx_irq;
138 int irq;
139 raw_spinlock_t lock;
140 const struct xilinx_cpm_variant *variant;
141};
142
143static u32 pcie_read(struct xilinx_cpm_pcie *port, u32 reg)
144{
145 return readl_relaxed(port->reg_base + reg);
146}
147
148static void pcie_write(struct xilinx_cpm_pcie *port,
149 u32 val, u32 reg)
150{
151 writel_relaxed(val, port->reg_base + reg);
152}
153
154static bool cpm_pcie_link_up(struct xilinx_cpm_pcie *port)
155{
156 return (pcie_read(port, XILINX_CPM_PCIE_REG_PSCR) &
157 XILINX_CPM_PCIE_REG_PSCR_LNKUP);
158}
159
160static void cpm_pcie_clear_err_interrupts(struct xilinx_cpm_pcie *port)
161{
162 unsigned long val = pcie_read(port, XILINX_CPM_PCIE_REG_RPEFR);
163
164 if (val & XILINX_CPM_PCIE_RPEFR_ERR_VALID) {
165 dev_dbg(port->dev, "Requester ID %lu\n",
166 val & XILINX_CPM_PCIE_RPEFR_REQ_ID);
167 pcie_write(port, XILINX_CPM_PCIE_RPEFR_ALL_MASK,
168 XILINX_CPM_PCIE_REG_RPEFR);
169 }
170}
171
172static void xilinx_cpm_mask_leg_irq(struct irq_data *data)
173{
174 struct xilinx_cpm_pcie *port = irq_data_get_irq_chip_data(data);
175 unsigned long flags;
176 u32 mask;
177 u32 val;
178
179 mask = BIT(data->hwirq + XILINX_CPM_PCIE_IDRN_SHIFT);
180 raw_spin_lock_irqsave(&port->lock, flags);
181 val = pcie_read(port, XILINX_CPM_PCIE_REG_IDRN_MASK);
182 pcie_write(port, (val & (~mask)), XILINX_CPM_PCIE_REG_IDRN_MASK);
183 raw_spin_unlock_irqrestore(&port->lock, flags);
184}
185
186static void xilinx_cpm_unmask_leg_irq(struct irq_data *data)
187{
188 struct xilinx_cpm_pcie *port = irq_data_get_irq_chip_data(data);
189 unsigned long flags;
190 u32 mask;
191 u32 val;
192
193 mask = BIT(data->hwirq + XILINX_CPM_PCIE_IDRN_SHIFT);
194 raw_spin_lock_irqsave(&port->lock, flags);
195 val = pcie_read(port, XILINX_CPM_PCIE_REG_IDRN_MASK);
196 pcie_write(port, (val | mask), XILINX_CPM_PCIE_REG_IDRN_MASK);
197 raw_spin_unlock_irqrestore(&port->lock, flags);
198}
199
200static struct irq_chip xilinx_cpm_leg_irq_chip = {
201 .name = "INTx",
202 .irq_mask = xilinx_cpm_mask_leg_irq,
203 .irq_unmask = xilinx_cpm_unmask_leg_irq,
204};
205
206/**
207 * xilinx_cpm_pcie_intx_map - Set the handler for the INTx and mark IRQ as valid
208 * @domain: IRQ domain
209 * @irq: Virtual IRQ number
210 * @hwirq: HW interrupt number
211 *
212 * Return: Always returns 0.
213 */
214static int xilinx_cpm_pcie_intx_map(struct irq_domain *domain,
215 unsigned int irq, irq_hw_number_t hwirq)
216{
217 irq_set_chip_and_handler(irq, &xilinx_cpm_leg_irq_chip,
218 handle_level_irq);
219 irq_set_chip_data(irq, domain->host_data);
220 irq_set_status_flags(irq, IRQ_LEVEL);
221
222 return 0;
223}
224
225/* INTx IRQ Domain operations */
226static const struct irq_domain_ops intx_domain_ops = {
227 .map = xilinx_cpm_pcie_intx_map,
228};
229
230static void xilinx_cpm_pcie_intx_flow(struct irq_desc *desc)
231{
232 struct xilinx_cpm_pcie *port = irq_desc_get_handler_data(desc);
233 struct irq_chip *chip = irq_desc_get_chip(desc);
234 unsigned long val;
235 int i;
236
237 chained_irq_enter(chip, desc);
238
239 val = FIELD_GET(XILINX_CPM_PCIE_IDRN_MASK,
240 pcie_read(port, XILINX_CPM_PCIE_REG_IDRN));
241
242 for_each_set_bit(i, &val, PCI_NUM_INTX)
243 generic_handle_domain_irq(port->intx_domain, i);
244
245 chained_irq_exit(chip, desc);
246}
247
248static void xilinx_cpm_mask_event_irq(struct irq_data *d)
249{
250 struct xilinx_cpm_pcie *port = irq_data_get_irq_chip_data(d);
251 u32 val;
252
253 raw_spin_lock(&port->lock);
254 val = pcie_read(port, XILINX_CPM_PCIE_REG_IMR);
255 val &= ~BIT(d->hwirq);
256 pcie_write(port, val, XILINX_CPM_PCIE_REG_IMR);
257 raw_spin_unlock(&port->lock);
258}
259
260static void xilinx_cpm_unmask_event_irq(struct irq_data *d)
261{
262 struct xilinx_cpm_pcie *port = irq_data_get_irq_chip_data(d);
263 u32 val;
264
265 raw_spin_lock(&port->lock);
266 val = pcie_read(port, XILINX_CPM_PCIE_REG_IMR);
267 val |= BIT(d->hwirq);
268 pcie_write(port, val, XILINX_CPM_PCIE_REG_IMR);
269 raw_spin_unlock(&port->lock);
270}
271
272static struct irq_chip xilinx_cpm_event_irq_chip = {
273 .name = "RC-Event",
274 .irq_mask = xilinx_cpm_mask_event_irq,
275 .irq_unmask = xilinx_cpm_unmask_event_irq,
276};
277
278static int xilinx_cpm_pcie_event_map(struct irq_domain *domain,
279 unsigned int irq, irq_hw_number_t hwirq)
280{
281 irq_set_chip_and_handler(irq, &xilinx_cpm_event_irq_chip,
282 handle_level_irq);
283 irq_set_chip_data(irq, domain->host_data);
284 irq_set_status_flags(irq, IRQ_LEVEL);
285 return 0;
286}
287
288static const struct irq_domain_ops event_domain_ops = {
289 .map = xilinx_cpm_pcie_event_map,
290};
291
292static void xilinx_cpm_pcie_event_flow(struct irq_desc *desc)
293{
294 struct xilinx_cpm_pcie *port = irq_desc_get_handler_data(desc);
295 struct irq_chip *chip = irq_desc_get_chip(desc);
296 unsigned long val;
297 int i;
298
299 chained_irq_enter(chip, desc);
300 val = pcie_read(port, XILINX_CPM_PCIE_REG_IDR);
301 val &= pcie_read(port, XILINX_CPM_PCIE_REG_IMR);
302 for_each_set_bit(i, &val, 32)
303 generic_handle_domain_irq(port->cpm_domain, i);
304 pcie_write(port, val, XILINX_CPM_PCIE_REG_IDR);
305
306 if (port->variant->version == CPM5) {
307 val = readl_relaxed(port->cpm_base + XILINX_CPM_PCIE_IR_STATUS);
308 if (val)
309 writel_relaxed(val, port->cpm_base +
310 XILINX_CPM_PCIE_IR_STATUS);
311 }
312
313 /*
314 * XILINX_CPM_PCIE_MISC_IR_STATUS register is mapped to
315 * CPM SLCR block.
316 */
317 val = readl_relaxed(port->cpm_base + XILINX_CPM_PCIE_MISC_IR_STATUS);
318 if (val)
319 writel_relaxed(val,
320 port->cpm_base + XILINX_CPM_PCIE_MISC_IR_STATUS);
321
322 chained_irq_exit(chip, desc);
323}
324
325#define _IC(x, s) \
326 [XILINX_CPM_PCIE_INTR_ ## x] = { __stringify(x), s }
327
328static const struct {
329 const char *sym;
330 const char *str;
331} intr_cause[32] = {
332 _IC(LINK_DOWN, "Link Down"),
333 _IC(HOT_RESET, "Hot reset"),
334 _IC(CFG_TIMEOUT, "ECAM access timeout"),
335 _IC(CORRECTABLE, "Correctable error message"),
336 _IC(NONFATAL, "Non fatal error message"),
337 _IC(FATAL, "Fatal error message"),
338 _IC(SLV_UNSUPP, "Slave unsupported request"),
339 _IC(SLV_UNEXP, "Slave unexpected completion"),
340 _IC(SLV_COMPL, "Slave completion timeout"),
341 _IC(SLV_ERRP, "Slave Error Poison"),
342 _IC(SLV_CMPABT, "Slave Completer Abort"),
343 _IC(SLV_ILLBUR, "Slave Illegal Burst"),
344 _IC(MST_DECERR, "Master decode error"),
345 _IC(MST_SLVERR, "Master slave error"),
346 _IC(CFG_PCIE_TIMEOUT, "PCIe ECAM access timeout"),
347 _IC(CFG_ERR_POISON, "ECAM poisoned completion received"),
348 _IC(PME_TO_ACK_RCVD, "PME_TO_ACK message received"),
349 _IC(PM_PME_RCVD, "PM_PME message received"),
350 _IC(SLV_PCIE_TIMEOUT, "PCIe completion timeout received"),
351};
352
353static irqreturn_t xilinx_cpm_pcie_intr_handler(int irq, void *dev_id)
354{
355 struct xilinx_cpm_pcie *port = dev_id;
356 struct device *dev = port->dev;
357 struct irq_data *d;
358
359 d = irq_domain_get_irq_data(port->cpm_domain, irq);
360
361 switch (d->hwirq) {
362 case XILINX_CPM_PCIE_INTR_CORRECTABLE:
363 case XILINX_CPM_PCIE_INTR_NONFATAL:
364 case XILINX_CPM_PCIE_INTR_FATAL:
365 cpm_pcie_clear_err_interrupts(port);
366 fallthrough;
367
368 default:
369 if (intr_cause[d->hwirq].str)
370 dev_warn(dev, "%s\n", intr_cause[d->hwirq].str);
371 else
372 dev_warn(dev, "Unknown IRQ %ld\n", d->hwirq);
373 }
374
375 return IRQ_HANDLED;
376}
377
378static void xilinx_cpm_free_irq_domains(struct xilinx_cpm_pcie *port)
379{
380 if (port->intx_domain) {
381 irq_domain_remove(port->intx_domain);
382 port->intx_domain = NULL;
383 }
384
385 if (port->cpm_domain) {
386 irq_domain_remove(port->cpm_domain);
387 port->cpm_domain = NULL;
388 }
389}
390
391/**
392 * xilinx_cpm_pcie_init_irq_domain - Initialize IRQ domain
393 * @port: PCIe port information
394 *
395 * Return: '0' on success and error value on failure
396 */
397static int xilinx_cpm_pcie_init_irq_domain(struct xilinx_cpm_pcie *port)
398{
399 struct device *dev = port->dev;
400 struct device_node *node = dev->of_node;
401 struct device_node *pcie_intc_node;
402
403 /* Setup INTx */
404 pcie_intc_node = of_get_next_child(node, NULL);
405 if (!pcie_intc_node) {
406 dev_err(dev, "No PCIe Intc node found\n");
407 return -EINVAL;
408 }
409
410 port->cpm_domain = irq_domain_add_linear(pcie_intc_node, 32,
411 &event_domain_ops,
412 port);
413 if (!port->cpm_domain)
414 goto out;
415
416 irq_domain_update_bus_token(port->cpm_domain, DOMAIN_BUS_NEXUS);
417
418 port->intx_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
419 &intx_domain_ops,
420 port);
421 if (!port->intx_domain)
422 goto out;
423
424 irq_domain_update_bus_token(port->intx_domain, DOMAIN_BUS_WIRED);
425
426 of_node_put(pcie_intc_node);
427 raw_spin_lock_init(&port->lock);
428
429 return 0;
430out:
431 xilinx_cpm_free_irq_domains(port);
432 of_node_put(pcie_intc_node);
433 dev_err(dev, "Failed to allocate IRQ domains\n");
434
435 return -ENOMEM;
436}
437
438static int xilinx_cpm_setup_irq(struct xilinx_cpm_pcie *port)
439{
440 struct device *dev = port->dev;
441 struct platform_device *pdev = to_platform_device(dev);
442 int i, irq;
443
444 port->irq = platform_get_irq(pdev, 0);
445 if (port->irq < 0)
446 return port->irq;
447
448 for (i = 0; i < ARRAY_SIZE(intr_cause); i++) {
449 int err;
450
451 if (!intr_cause[i].str)
452 continue;
453
454 irq = irq_create_mapping(port->cpm_domain, i);
455 if (!irq) {
456 dev_err(dev, "Failed to map interrupt\n");
457 return -ENXIO;
458 }
459
460 err = devm_request_irq(dev, irq, xilinx_cpm_pcie_intr_handler,
461 0, intr_cause[i].sym, port);
462 if (err) {
463 dev_err(dev, "Failed to request IRQ %d\n", irq);
464 return err;
465 }
466 }
467
468 port->intx_irq = irq_create_mapping(port->cpm_domain,
469 XILINX_CPM_PCIE_INTR_INTX);
470 if (!port->intx_irq) {
471 dev_err(dev, "Failed to map INTx interrupt\n");
472 return -ENXIO;
473 }
474
475 /* Plug the INTx chained handler */
476 irq_set_chained_handler_and_data(port->intx_irq,
477 xilinx_cpm_pcie_intx_flow, port);
478
479 /* Plug the main event chained handler */
480 irq_set_chained_handler_and_data(port->irq,
481 xilinx_cpm_pcie_event_flow, port);
482
483 return 0;
484}
485
486/**
487 * xilinx_cpm_pcie_init_port - Initialize hardware
488 * @port: PCIe port information
489 */
490static void xilinx_cpm_pcie_init_port(struct xilinx_cpm_pcie *port)
491{
492 if (cpm_pcie_link_up(port))
493 dev_info(port->dev, "PCIe Link is UP\n");
494 else
495 dev_info(port->dev, "PCIe Link is DOWN\n");
496
497 /* Disable all interrupts */
498 pcie_write(port, ~XILINX_CPM_PCIE_IDR_ALL_MASK,
499 XILINX_CPM_PCIE_REG_IMR);
500
501 /* Clear pending interrupts */
502 pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_IDR) &
503 XILINX_CPM_PCIE_IMR_ALL_MASK,
504 XILINX_CPM_PCIE_REG_IDR);
505
506 /*
507 * XILINX_CPM_PCIE_MISC_IR_ENABLE register is mapped to
508 * CPM SLCR block.
509 */
510 writel(XILINX_CPM_PCIE_MISC_IR_LOCAL,
511 port->cpm_base + XILINX_CPM_PCIE_MISC_IR_ENABLE);
512
513 if (port->variant->version == CPM5) {
514 writel(XILINX_CPM_PCIE_IR_LOCAL,
515 port->cpm_base + XILINX_CPM_PCIE_IR_ENABLE);
516 }
517
518 /* Enable the Bridge enable bit */
519 pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_RPSC) |
520 XILINX_CPM_PCIE_REG_RPSC_BEN,
521 XILINX_CPM_PCIE_REG_RPSC);
522}
523
524/**
525 * xilinx_cpm_pcie_parse_dt - Parse Device tree
526 * @port: PCIe port information
527 * @bus_range: Bus resource
528 *
529 * Return: '0' on success and error value on failure
530 */
531static int xilinx_cpm_pcie_parse_dt(struct xilinx_cpm_pcie *port,
532 struct resource *bus_range)
533{
534 struct device *dev = port->dev;
535 struct platform_device *pdev = to_platform_device(dev);
536 struct resource *res;
537
538 port->cpm_base = devm_platform_ioremap_resource_byname(pdev,
539 "cpm_slcr");
540 if (IS_ERR(port->cpm_base))
541 return PTR_ERR(port->cpm_base);
542
543 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
544 if (!res)
545 return -ENXIO;
546
547 port->cfg = pci_ecam_create(dev, res, bus_range,
548 &pci_generic_ecam_ops);
549 if (IS_ERR(port->cfg))
550 return PTR_ERR(port->cfg);
551
552 if (port->variant->version == CPM5) {
553 port->reg_base = devm_platform_ioremap_resource_byname(pdev,
554 "cpm_csr");
555 if (IS_ERR(port->reg_base))
556 return PTR_ERR(port->reg_base);
557 } else {
558 port->reg_base = port->cfg->win;
559 }
560
561 return 0;
562}
563
564static void xilinx_cpm_free_interrupts(struct xilinx_cpm_pcie *port)
565{
566 irq_set_chained_handler_and_data(port->intx_irq, NULL, NULL);
567 irq_set_chained_handler_and_data(port->irq, NULL, NULL);
568}
569
570/**
571 * xilinx_cpm_pcie_probe - Probe function
572 * @pdev: Platform device pointer
573 *
574 * Return: '0' on success and error value on failure
575 */
576static int xilinx_cpm_pcie_probe(struct platform_device *pdev)
577{
578 struct xilinx_cpm_pcie *port;
579 struct device *dev = &pdev->dev;
580 struct pci_host_bridge *bridge;
581 struct resource_entry *bus;
582 int err;
583
584 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
585 if (!bridge)
586 return -ENODEV;
587
588 port = pci_host_bridge_priv(bridge);
589
590 port->dev = dev;
591
592 err = xilinx_cpm_pcie_init_irq_domain(port);
593 if (err)
594 return err;
595
596 bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
597 if (!bus)
598 return -ENODEV;
599
600 port->variant = of_device_get_match_data(dev);
601
602 err = xilinx_cpm_pcie_parse_dt(port, bus->res);
603 if (err) {
604 dev_err(dev, "Parsing DT failed\n");
605 goto err_parse_dt;
606 }
607
608 xilinx_cpm_pcie_init_port(port);
609
610 err = xilinx_cpm_setup_irq(port);
611 if (err) {
612 dev_err(dev, "Failed to set up interrupts\n");
613 goto err_setup_irq;
614 }
615
616 bridge->sysdata = port->cfg;
617 bridge->ops = (struct pci_ops *)&pci_generic_ecam_ops.pci_ops;
618
619 err = pci_host_probe(bridge);
620 if (err < 0)
621 goto err_host_bridge;
622
623 return 0;
624
625err_host_bridge:
626 xilinx_cpm_free_interrupts(port);
627err_setup_irq:
628 pci_ecam_free(port->cfg);
629err_parse_dt:
630 xilinx_cpm_free_irq_domains(port);
631 return err;
632}
633
634static const struct xilinx_cpm_variant cpm_host = {
635 .version = CPM,
636};
637
638static const struct xilinx_cpm_variant cpm5_host = {
639 .version = CPM5,
640};
641
642static const struct of_device_id xilinx_cpm_pcie_of_match[] = {
643 {
644 .compatible = "xlnx,versal-cpm-host-1.00",
645 .data = &cpm_host,
646 },
647 {
648 .compatible = "xlnx,versal-cpm5-host",
649 .data = &cpm5_host,
650 },
651 {}
652};
653
654static struct platform_driver xilinx_cpm_pcie_driver = {
655 .driver = {
656 .name = "xilinx-cpm-pcie",
657 .of_match_table = xilinx_cpm_pcie_of_match,
658 .suppress_bind_attrs = true,
659 },
660 .probe = xilinx_cpm_pcie_probe,
661};
662
663builtin_platform_driver(xilinx_cpm_pcie_driver);