Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Synopsys DesignWare PCIe host controller driver
4 *
5 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
6 * https://www.samsung.com
7 *
8 * Author: Jingoo Han <jg1.han@samsung.com>
9 */
10
11#include <linux/iopoll.h>
12#include <linux/irqchip/chained_irq.h>
13#include <linux/irqdomain.h>
14#include <linux/msi.h>
15#include <linux/of_address.h>
16#include <linux/of_pci.h>
17#include <linux/pci_regs.h>
18#include <linux/platform_device.h>
19
20#include "../../pci.h"
21#include "pcie-designware.h"
22
23static struct pci_ops dw_pcie_ops;
24static struct pci_ops dw_child_pcie_ops;
25
26static void dw_msi_ack_irq(struct irq_data *d)
27{
28 irq_chip_ack_parent(d);
29}
30
31static void dw_msi_mask_irq(struct irq_data *d)
32{
33 pci_msi_mask_irq(d);
34 irq_chip_mask_parent(d);
35}
36
37static void dw_msi_unmask_irq(struct irq_data *d)
38{
39 pci_msi_unmask_irq(d);
40 irq_chip_unmask_parent(d);
41}
42
43static struct irq_chip dw_pcie_msi_irq_chip = {
44 .name = "PCI-MSI",
45 .irq_ack = dw_msi_ack_irq,
46 .irq_mask = dw_msi_mask_irq,
47 .irq_unmask = dw_msi_unmask_irq,
48};
49
50static struct msi_domain_info dw_pcie_msi_domain_info = {
51 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
52 MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
53 .chip = &dw_pcie_msi_irq_chip,
54};
55
56/* MSI int handler */
57irqreturn_t dw_handle_msi_irq(struct dw_pcie_rp *pp)
58{
59 int i, pos;
60 unsigned long val;
61 u32 status, num_ctrls;
62 irqreturn_t ret = IRQ_NONE;
63 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
64
65 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
66
67 for (i = 0; i < num_ctrls; i++) {
68 status = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS +
69 (i * MSI_REG_CTRL_BLOCK_SIZE));
70 if (!status)
71 continue;
72
73 ret = IRQ_HANDLED;
74 val = status;
75 pos = 0;
76 while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
77 pos)) != MAX_MSI_IRQS_PER_CTRL) {
78 generic_handle_domain_irq(pp->irq_domain,
79 (i * MAX_MSI_IRQS_PER_CTRL) +
80 pos);
81 pos++;
82 }
83 }
84
85 return ret;
86}
87
88/* Chained MSI interrupt service routine */
89static void dw_chained_msi_isr(struct irq_desc *desc)
90{
91 struct irq_chip *chip = irq_desc_get_chip(desc);
92 struct dw_pcie_rp *pp;
93
94 chained_irq_enter(chip, desc);
95
96 pp = irq_desc_get_handler_data(desc);
97 dw_handle_msi_irq(pp);
98
99 chained_irq_exit(chip, desc);
100}
101
102static void dw_pci_setup_msi_msg(struct irq_data *d, struct msi_msg *msg)
103{
104 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
105 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
106 u64 msi_target;
107
108 msi_target = (u64)pp->msi_data;
109
110 msg->address_lo = lower_32_bits(msi_target);
111 msg->address_hi = upper_32_bits(msi_target);
112
113 msg->data = d->hwirq;
114
115 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
116 (int)d->hwirq, msg->address_hi, msg->address_lo);
117}
118
119static int dw_pci_msi_set_affinity(struct irq_data *d,
120 const struct cpumask *mask, bool force)
121{
122 return -EINVAL;
123}
124
125static void dw_pci_bottom_mask(struct irq_data *d)
126{
127 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
128 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
129 unsigned int res, bit, ctrl;
130 unsigned long flags;
131
132 raw_spin_lock_irqsave(&pp->lock, flags);
133
134 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
135 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
136 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
137
138 pp->irq_mask[ctrl] |= BIT(bit);
139 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
140
141 raw_spin_unlock_irqrestore(&pp->lock, flags);
142}
143
144static void dw_pci_bottom_unmask(struct irq_data *d)
145{
146 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
147 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
148 unsigned int res, bit, ctrl;
149 unsigned long flags;
150
151 raw_spin_lock_irqsave(&pp->lock, flags);
152
153 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
154 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
155 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
156
157 pp->irq_mask[ctrl] &= ~BIT(bit);
158 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
159
160 raw_spin_unlock_irqrestore(&pp->lock, flags);
161}
162
163static void dw_pci_bottom_ack(struct irq_data *d)
164{
165 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
166 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
167 unsigned int res, bit, ctrl;
168
169 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
170 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
171 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
172
173 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_STATUS + res, BIT(bit));
174}
175
176static struct irq_chip dw_pci_msi_bottom_irq_chip = {
177 .name = "DWPCI-MSI",
178 .irq_ack = dw_pci_bottom_ack,
179 .irq_compose_msi_msg = dw_pci_setup_msi_msg,
180 .irq_set_affinity = dw_pci_msi_set_affinity,
181 .irq_mask = dw_pci_bottom_mask,
182 .irq_unmask = dw_pci_bottom_unmask,
183};
184
185static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
186 unsigned int virq, unsigned int nr_irqs,
187 void *args)
188{
189 struct dw_pcie_rp *pp = domain->host_data;
190 unsigned long flags;
191 u32 i;
192 int bit;
193
194 raw_spin_lock_irqsave(&pp->lock, flags);
195
196 bit = bitmap_find_free_region(pp->msi_irq_in_use, pp->num_vectors,
197 order_base_2(nr_irqs));
198
199 raw_spin_unlock_irqrestore(&pp->lock, flags);
200
201 if (bit < 0)
202 return -ENOSPC;
203
204 for (i = 0; i < nr_irqs; i++)
205 irq_domain_set_info(domain, virq + i, bit + i,
206 pp->msi_irq_chip,
207 pp, handle_edge_irq,
208 NULL, NULL);
209
210 return 0;
211}
212
213static void dw_pcie_irq_domain_free(struct irq_domain *domain,
214 unsigned int virq, unsigned int nr_irqs)
215{
216 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
217 struct dw_pcie_rp *pp = domain->host_data;
218 unsigned long flags;
219
220 raw_spin_lock_irqsave(&pp->lock, flags);
221
222 bitmap_release_region(pp->msi_irq_in_use, d->hwirq,
223 order_base_2(nr_irqs));
224
225 raw_spin_unlock_irqrestore(&pp->lock, flags);
226}
227
228static const struct irq_domain_ops dw_pcie_msi_domain_ops = {
229 .alloc = dw_pcie_irq_domain_alloc,
230 .free = dw_pcie_irq_domain_free,
231};
232
233int dw_pcie_allocate_domains(struct dw_pcie_rp *pp)
234{
235 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
236 struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
237
238 pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
239 &dw_pcie_msi_domain_ops, pp);
240 if (!pp->irq_domain) {
241 dev_err(pci->dev, "Failed to create IRQ domain\n");
242 return -ENOMEM;
243 }
244
245 irq_domain_update_bus_token(pp->irq_domain, DOMAIN_BUS_NEXUS);
246
247 pp->msi_domain = pci_msi_create_irq_domain(fwnode,
248 &dw_pcie_msi_domain_info,
249 pp->irq_domain);
250 if (!pp->msi_domain) {
251 dev_err(pci->dev, "Failed to create MSI domain\n");
252 irq_domain_remove(pp->irq_domain);
253 return -ENOMEM;
254 }
255
256 return 0;
257}
258
259static void dw_pcie_free_msi(struct dw_pcie_rp *pp)
260{
261 u32 ctrl;
262
263 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) {
264 if (pp->msi_irq[ctrl] > 0)
265 irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
266 NULL, NULL);
267 }
268
269 irq_domain_remove(pp->msi_domain);
270 irq_domain_remove(pp->irq_domain);
271}
272
273static void dw_pcie_msi_init(struct dw_pcie_rp *pp)
274{
275 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
276 u64 msi_target = (u64)pp->msi_data;
277
278 if (!pci_msi_enabled() || !pp->has_msi_ctrl)
279 return;
280
281 /* Program the msi_data */
282 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_LO, lower_32_bits(msi_target));
283 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target));
284}
285
286static int dw_pcie_parse_split_msi_irq(struct dw_pcie_rp *pp)
287{
288 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
289 struct device *dev = pci->dev;
290 struct platform_device *pdev = to_platform_device(dev);
291 u32 ctrl, max_vectors;
292 int irq;
293
294 /* Parse any "msiX" IRQs described in the devicetree */
295 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) {
296 char msi_name[] = "msiX";
297
298 msi_name[3] = '0' + ctrl;
299 irq = platform_get_irq_byname_optional(pdev, msi_name);
300 if (irq == -ENXIO)
301 break;
302 if (irq < 0)
303 return dev_err_probe(dev, irq,
304 "Failed to parse MSI IRQ '%s'\n",
305 msi_name);
306
307 pp->msi_irq[ctrl] = irq;
308 }
309
310 /* If no "msiX" IRQs, caller should fallback to "msi" IRQ */
311 if (ctrl == 0)
312 return -ENXIO;
313
314 max_vectors = ctrl * MAX_MSI_IRQS_PER_CTRL;
315 if (pp->num_vectors > max_vectors) {
316 dev_warn(dev, "Exceeding number of MSI vectors, limiting to %u\n",
317 max_vectors);
318 pp->num_vectors = max_vectors;
319 }
320 if (!pp->num_vectors)
321 pp->num_vectors = max_vectors;
322
323 return 0;
324}
325
326static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp)
327{
328 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
329 struct device *dev = pci->dev;
330 struct platform_device *pdev = to_platform_device(dev);
331 u64 *msi_vaddr;
332 int ret;
333 u32 ctrl, num_ctrls;
334
335 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++)
336 pp->irq_mask[ctrl] = ~0;
337
338 if (!pp->msi_irq[0]) {
339 ret = dw_pcie_parse_split_msi_irq(pp);
340 if (ret < 0 && ret != -ENXIO)
341 return ret;
342 }
343
344 if (!pp->num_vectors)
345 pp->num_vectors = MSI_DEF_NUM_VECTORS;
346 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
347
348 if (!pp->msi_irq[0]) {
349 pp->msi_irq[0] = platform_get_irq_byname_optional(pdev, "msi");
350 if (pp->msi_irq[0] < 0) {
351 pp->msi_irq[0] = platform_get_irq(pdev, 0);
352 if (pp->msi_irq[0] < 0)
353 return pp->msi_irq[0];
354 }
355 }
356
357 dev_dbg(dev, "Using %d MSI vectors\n", pp->num_vectors);
358
359 pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
360
361 ret = dw_pcie_allocate_domains(pp);
362 if (ret)
363 return ret;
364
365 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
366 if (pp->msi_irq[ctrl] > 0)
367 irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
368 dw_chained_msi_isr, pp);
369 }
370
371 /*
372 * Even though the iMSI-RX Module supports 64-bit addresses some
373 * peripheral PCIe devices may lack 64-bit message support. In
374 * order not to miss MSI TLPs from those devices the MSI target
375 * address has to be within the lowest 4GB.
376 *
377 * Note until there is a better alternative found the reservation is
378 * done by allocating from the artificially limited DMA-coherent
379 * memory.
380 */
381 ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
382 if (ret)
383 dev_warn(dev, "Failed to set DMA mask to 32-bit. Devices with only 32-bit MSI support may not work properly\n");
384
385 msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data,
386 GFP_KERNEL);
387 if (!msi_vaddr) {
388 dev_err(dev, "Failed to alloc and map MSI data\n");
389 dw_pcie_free_msi(pp);
390 return -ENOMEM;
391 }
392
393 return 0;
394}
395
396int dw_pcie_host_init(struct dw_pcie_rp *pp)
397{
398 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
399 struct device *dev = pci->dev;
400 struct device_node *np = dev->of_node;
401 struct platform_device *pdev = to_platform_device(dev);
402 struct resource_entry *win;
403 struct pci_host_bridge *bridge;
404 struct resource *res;
405 int ret;
406
407 raw_spin_lock_init(&pp->lock);
408
409 ret = dw_pcie_get_resources(pci);
410 if (ret)
411 return ret;
412
413 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
414 if (res) {
415 pp->cfg0_size = resource_size(res);
416 pp->cfg0_base = res->start;
417
418 pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
419 if (IS_ERR(pp->va_cfg0_base))
420 return PTR_ERR(pp->va_cfg0_base);
421 } else {
422 dev_err(dev, "Missing *config* reg space\n");
423 return -ENODEV;
424 }
425
426 bridge = devm_pci_alloc_host_bridge(dev, 0);
427 if (!bridge)
428 return -ENOMEM;
429
430 pp->bridge = bridge;
431
432 /* Get the I/O range from DT */
433 win = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
434 if (win) {
435 pp->io_size = resource_size(win->res);
436 pp->io_bus_addr = win->res->start - win->offset;
437 pp->io_base = pci_pio_to_address(win->res->start);
438 }
439
440 /* Set default bus ops */
441 bridge->ops = &dw_pcie_ops;
442 bridge->child_ops = &dw_child_pcie_ops;
443
444 if (pp->ops->init) {
445 ret = pp->ops->init(pp);
446 if (ret)
447 return ret;
448 }
449
450 if (pci_msi_enabled()) {
451 pp->has_msi_ctrl = !(pp->ops->msi_init ||
452 of_property_read_bool(np, "msi-parent") ||
453 of_property_read_bool(np, "msi-map"));
454
455 /*
456 * For the has_msi_ctrl case the default assignment is handled
457 * in the dw_pcie_msi_host_init().
458 */
459 if (!pp->has_msi_ctrl && !pp->num_vectors) {
460 pp->num_vectors = MSI_DEF_NUM_VECTORS;
461 } else if (pp->num_vectors > MAX_MSI_IRQS) {
462 dev_err(dev, "Invalid number of vectors\n");
463 ret = -EINVAL;
464 goto err_deinit_host;
465 }
466
467 if (pp->ops->msi_init) {
468 ret = pp->ops->msi_init(pp);
469 if (ret < 0)
470 goto err_deinit_host;
471 } else if (pp->has_msi_ctrl) {
472 ret = dw_pcie_msi_host_init(pp);
473 if (ret < 0)
474 goto err_deinit_host;
475 }
476 }
477
478 dw_pcie_version_detect(pci);
479
480 dw_pcie_iatu_detect(pci);
481
482 ret = dw_pcie_edma_detect(pci);
483 if (ret)
484 goto err_free_msi;
485
486 ret = dw_pcie_setup_rc(pp);
487 if (ret)
488 goto err_remove_edma;
489
490 if (!dw_pcie_link_up(pci)) {
491 ret = dw_pcie_start_link(pci);
492 if (ret)
493 goto err_remove_edma;
494 }
495
496 /* Ignore errors, the link may come up later */
497 dw_pcie_wait_for_link(pci);
498
499 bridge->sysdata = pp;
500
501 ret = pci_host_probe(bridge);
502 if (ret)
503 goto err_stop_link;
504
505 if (pp->ops->post_init)
506 pp->ops->post_init(pp);
507
508 return 0;
509
510err_stop_link:
511 dw_pcie_stop_link(pci);
512
513err_remove_edma:
514 dw_pcie_edma_remove(pci);
515
516err_free_msi:
517 if (pp->has_msi_ctrl)
518 dw_pcie_free_msi(pp);
519
520err_deinit_host:
521 if (pp->ops->deinit)
522 pp->ops->deinit(pp);
523
524 return ret;
525}
526EXPORT_SYMBOL_GPL(dw_pcie_host_init);
527
528void dw_pcie_host_deinit(struct dw_pcie_rp *pp)
529{
530 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
531
532 pci_stop_root_bus(pp->bridge->bus);
533 pci_remove_root_bus(pp->bridge->bus);
534
535 dw_pcie_stop_link(pci);
536
537 dw_pcie_edma_remove(pci);
538
539 if (pp->has_msi_ctrl)
540 dw_pcie_free_msi(pp);
541
542 if (pp->ops->deinit)
543 pp->ops->deinit(pp);
544}
545EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
546
547static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
548 unsigned int devfn, int where)
549{
550 struct dw_pcie_rp *pp = bus->sysdata;
551 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
552 int type, ret;
553 u32 busdev;
554
555 /*
556 * Checking whether the link is up here is a last line of defense
557 * against platforms that forward errors on the system bus as
558 * SError upon PCI configuration transactions issued when the link
559 * is down. This check is racy by definition and does not stop
560 * the system from triggering an SError if the link goes down
561 * after this check is performed.
562 */
563 if (!dw_pcie_link_up(pci))
564 return NULL;
565
566 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
567 PCIE_ATU_FUNC(PCI_FUNC(devfn));
568
569 if (pci_is_root_bus(bus->parent))
570 type = PCIE_ATU_TYPE_CFG0;
571 else
572 type = PCIE_ATU_TYPE_CFG1;
573
574 ret = dw_pcie_prog_outbound_atu(pci, 0, type, pp->cfg0_base, busdev,
575 pp->cfg0_size);
576 if (ret)
577 return NULL;
578
579 return pp->va_cfg0_base + where;
580}
581
582static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
583 int where, int size, u32 *val)
584{
585 struct dw_pcie_rp *pp = bus->sysdata;
586 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
587 int ret;
588
589 ret = pci_generic_config_read(bus, devfn, where, size, val);
590 if (ret != PCIBIOS_SUCCESSFUL)
591 return ret;
592
593 if (pp->cfg0_io_shared) {
594 ret = dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO,
595 pp->io_base, pp->io_bus_addr,
596 pp->io_size);
597 if (ret)
598 return PCIBIOS_SET_FAILED;
599 }
600
601 return PCIBIOS_SUCCESSFUL;
602}
603
604static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
605 int where, int size, u32 val)
606{
607 struct dw_pcie_rp *pp = bus->sysdata;
608 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
609 int ret;
610
611 ret = pci_generic_config_write(bus, devfn, where, size, val);
612 if (ret != PCIBIOS_SUCCESSFUL)
613 return ret;
614
615 if (pp->cfg0_io_shared) {
616 ret = dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO,
617 pp->io_base, pp->io_bus_addr,
618 pp->io_size);
619 if (ret)
620 return PCIBIOS_SET_FAILED;
621 }
622
623 return PCIBIOS_SUCCESSFUL;
624}
625
626static struct pci_ops dw_child_pcie_ops = {
627 .map_bus = dw_pcie_other_conf_map_bus,
628 .read = dw_pcie_rd_other_conf,
629 .write = dw_pcie_wr_other_conf,
630};
631
632void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where)
633{
634 struct dw_pcie_rp *pp = bus->sysdata;
635 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
636
637 if (PCI_SLOT(devfn) > 0)
638 return NULL;
639
640 return pci->dbi_base + where;
641}
642EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);
643
644static struct pci_ops dw_pcie_ops = {
645 .map_bus = dw_pcie_own_conf_map_bus,
646 .read = pci_generic_config_read,
647 .write = pci_generic_config_write,
648};
649
650static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
651{
652 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
653 struct resource_entry *entry;
654 int i, ret;
655
656 /* Note the very first outbound ATU is used for CFG IOs */
657 if (!pci->num_ob_windows) {
658 dev_err(pci->dev, "No outbound iATU found\n");
659 return -EINVAL;
660 }
661
662 /*
663 * Ensure all out/inbound windows are disabled before proceeding with
664 * the MEM/IO (dma-)ranges setups.
665 */
666 for (i = 0; i < pci->num_ob_windows; i++)
667 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_OB, i);
668
669 for (i = 0; i < pci->num_ib_windows; i++)
670 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, i);
671
672 i = 0;
673 resource_list_for_each_entry(entry, &pp->bridge->windows) {
674 if (resource_type(entry->res) != IORESOURCE_MEM)
675 continue;
676
677 if (pci->num_ob_windows <= ++i)
678 break;
679
680 ret = dw_pcie_prog_outbound_atu(pci, i, PCIE_ATU_TYPE_MEM,
681 entry->res->start,
682 entry->res->start - entry->offset,
683 resource_size(entry->res));
684 if (ret) {
685 dev_err(pci->dev, "Failed to set MEM range %pr\n",
686 entry->res);
687 return ret;
688 }
689 }
690
691 if (pp->io_size) {
692 if (pci->num_ob_windows > ++i) {
693 ret = dw_pcie_prog_outbound_atu(pci, i, PCIE_ATU_TYPE_IO,
694 pp->io_base,
695 pp->io_bus_addr,
696 pp->io_size);
697 if (ret) {
698 dev_err(pci->dev, "Failed to set IO range %pr\n",
699 entry->res);
700 return ret;
701 }
702 } else {
703 pp->cfg0_io_shared = true;
704 }
705 }
706
707 if (pci->num_ob_windows <= i)
708 dev_warn(pci->dev, "Ranges exceed outbound iATU size (%d)\n",
709 pci->num_ob_windows);
710
711 i = 0;
712 resource_list_for_each_entry(entry, &pp->bridge->dma_ranges) {
713 if (resource_type(entry->res) != IORESOURCE_MEM)
714 continue;
715
716 if (pci->num_ib_windows <= i)
717 break;
718
719 ret = dw_pcie_prog_inbound_atu(pci, i++, PCIE_ATU_TYPE_MEM,
720 entry->res->start,
721 entry->res->start - entry->offset,
722 resource_size(entry->res));
723 if (ret) {
724 dev_err(pci->dev, "Failed to set DMA range %pr\n",
725 entry->res);
726 return ret;
727 }
728 }
729
730 if (pci->num_ib_windows <= i)
731 dev_warn(pci->dev, "Dma-ranges exceed inbound iATU size (%u)\n",
732 pci->num_ib_windows);
733
734 return 0;
735}
736
737int dw_pcie_setup_rc(struct dw_pcie_rp *pp)
738{
739 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
740 u32 val, ctrl, num_ctrls;
741 int ret;
742
743 /*
744 * Enable DBI read-only registers for writing/updating configuration.
745 * Write permission gets disabled towards the end of this function.
746 */
747 dw_pcie_dbi_ro_wr_en(pci);
748
749 dw_pcie_setup(pci);
750
751 if (pp->has_msi_ctrl) {
752 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
753
754 /* Initialize IRQ Status array */
755 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
756 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
757 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
758 pp->irq_mask[ctrl]);
759 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
760 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
761 ~0);
762 }
763 }
764
765 dw_pcie_msi_init(pp);
766
767 /* Setup RC BARs */
768 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
769 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
770
771 /* Setup interrupt pins */
772 val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
773 val &= 0xffff00ff;
774 val |= 0x00000100;
775 dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
776
777 /* Setup bus numbers */
778 val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
779 val &= 0xff000000;
780 val |= 0x00ff0100;
781 dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
782
783 /* Setup command register */
784 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
785 val &= 0xffff0000;
786 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
787 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
788 dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
789
790 /*
791 * If the platform provides its own child bus config accesses, it means
792 * the platform uses its own address translation component rather than
793 * ATU, so we should not program the ATU here.
794 */
795 if (pp->bridge->child_ops == &dw_child_pcie_ops) {
796 ret = dw_pcie_iatu_setup(pp);
797 if (ret)
798 return ret;
799 }
800
801 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
802
803 /* Program correct class for RC */
804 dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);
805
806 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
807 val |= PORT_LOGIC_SPEED_CHANGE;
808 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
809
810 dw_pcie_dbi_ro_wr_dis(pci);
811
812 return 0;
813}
814EXPORT_SYMBOL_GPL(dw_pcie_setup_rc);
815
816int dw_pcie_suspend_noirq(struct dw_pcie *pci)
817{
818 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
819 u32 val;
820 int ret;
821
822 /*
823 * If L1SS is supported, then do not put the link into L2 as some
824 * devices such as NVMe expect low resume latency.
825 */
826 if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) & PCI_EXP_LNKCTL_ASPM_L1)
827 return 0;
828
829 if (dw_pcie_get_ltssm(pci) <= DW_PCIE_LTSSM_DETECT_ACT)
830 return 0;
831
832 if (!pci->pp.ops->pme_turn_off)
833 return 0;
834
835 pci->pp.ops->pme_turn_off(&pci->pp);
836
837 ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE,
838 PCIE_PME_TO_L2_TIMEOUT_US/10,
839 PCIE_PME_TO_L2_TIMEOUT_US, false, pci);
840 if (ret) {
841 dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val);
842 return ret;
843 }
844
845 if (pci->pp.ops->deinit)
846 pci->pp.ops->deinit(&pci->pp);
847
848 pci->suspended = true;
849
850 return ret;
851}
852EXPORT_SYMBOL_GPL(dw_pcie_suspend_noirq);
853
854int dw_pcie_resume_noirq(struct dw_pcie *pci)
855{
856 int ret;
857
858 if (!pci->suspended)
859 return 0;
860
861 pci->suspended = false;
862
863 if (pci->pp.ops->init) {
864 ret = pci->pp.ops->init(&pci->pp);
865 if (ret) {
866 dev_err(pci->dev, "Host init failed: %d\n", ret);
867 return ret;
868 }
869 }
870
871 dw_pcie_setup_rc(&pci->pp);
872
873 ret = dw_pcie_start_link(pci);
874 if (ret)
875 return ret;
876
877 ret = dw_pcie_wait_for_link(pci);
878 if (ret)
879 return ret;
880
881 return ret;
882}
883EXPORT_SYMBOL_GPL(dw_pcie_resume_noirq);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Synopsys DesignWare PCIe host controller driver
4 *
5 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
6 * https://www.samsung.com
7 *
8 * Author: Jingoo Han <jg1.han@samsung.com>
9 */
10
11#include <linux/iopoll.h>
12#include <linux/irqchip/chained_irq.h>
13#include <linux/irqdomain.h>
14#include <linux/msi.h>
15#include <linux/of_address.h>
16#include <linux/of_pci.h>
17#include <linux/pci_regs.h>
18#include <linux/platform_device.h>
19
20#include "../../pci.h"
21#include "pcie-designware.h"
22
23static struct pci_ops dw_pcie_ops;
24static struct pci_ops dw_child_pcie_ops;
25
26static void dw_msi_ack_irq(struct irq_data *d)
27{
28 irq_chip_ack_parent(d);
29}
30
31static void dw_msi_mask_irq(struct irq_data *d)
32{
33 pci_msi_mask_irq(d);
34 irq_chip_mask_parent(d);
35}
36
37static void dw_msi_unmask_irq(struct irq_data *d)
38{
39 pci_msi_unmask_irq(d);
40 irq_chip_unmask_parent(d);
41}
42
43static struct irq_chip dw_pcie_msi_irq_chip = {
44 .name = "PCI-MSI",
45 .irq_ack = dw_msi_ack_irq,
46 .irq_mask = dw_msi_mask_irq,
47 .irq_unmask = dw_msi_unmask_irq,
48};
49
50static struct msi_domain_info dw_pcie_msi_domain_info = {
51 .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
52 MSI_FLAG_NO_AFFINITY | MSI_FLAG_PCI_MSIX |
53 MSI_FLAG_MULTI_PCI_MSI,
54 .chip = &dw_pcie_msi_irq_chip,
55};
56
57/* MSI int handler */
58irqreturn_t dw_handle_msi_irq(struct dw_pcie_rp *pp)
59{
60 int i, pos;
61 unsigned long val;
62 u32 status, num_ctrls;
63 irqreturn_t ret = IRQ_NONE;
64 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
65
66 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
67
68 for (i = 0; i < num_ctrls; i++) {
69 status = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS +
70 (i * MSI_REG_CTRL_BLOCK_SIZE));
71 if (!status)
72 continue;
73
74 ret = IRQ_HANDLED;
75 val = status;
76 pos = 0;
77 while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
78 pos)) != MAX_MSI_IRQS_PER_CTRL) {
79 generic_handle_domain_irq(pp->irq_domain,
80 (i * MAX_MSI_IRQS_PER_CTRL) +
81 pos);
82 pos++;
83 }
84 }
85
86 return ret;
87}
88
89/* Chained MSI interrupt service routine */
90static void dw_chained_msi_isr(struct irq_desc *desc)
91{
92 struct irq_chip *chip = irq_desc_get_chip(desc);
93 struct dw_pcie_rp *pp;
94
95 chained_irq_enter(chip, desc);
96
97 pp = irq_desc_get_handler_data(desc);
98 dw_handle_msi_irq(pp);
99
100 chained_irq_exit(chip, desc);
101}
102
103static void dw_pci_setup_msi_msg(struct irq_data *d, struct msi_msg *msg)
104{
105 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
106 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
107 u64 msi_target;
108
109 msi_target = (u64)pp->msi_data;
110
111 msg->address_lo = lower_32_bits(msi_target);
112 msg->address_hi = upper_32_bits(msi_target);
113
114 msg->data = d->hwirq;
115
116 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
117 (int)d->hwirq, msg->address_hi, msg->address_lo);
118}
119
120static void dw_pci_bottom_mask(struct irq_data *d)
121{
122 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
123 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
124 unsigned int res, bit, ctrl;
125 unsigned long flags;
126
127 raw_spin_lock_irqsave(&pp->lock, flags);
128
129 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
130 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
131 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
132
133 pp->irq_mask[ctrl] |= BIT(bit);
134 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
135
136 raw_spin_unlock_irqrestore(&pp->lock, flags);
137}
138
139static void dw_pci_bottom_unmask(struct irq_data *d)
140{
141 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
142 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
143 unsigned int res, bit, ctrl;
144 unsigned long flags;
145
146 raw_spin_lock_irqsave(&pp->lock, flags);
147
148 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
149 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
150 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
151
152 pp->irq_mask[ctrl] &= ~BIT(bit);
153 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
154
155 raw_spin_unlock_irqrestore(&pp->lock, flags);
156}
157
158static void dw_pci_bottom_ack(struct irq_data *d)
159{
160 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
161 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
162 unsigned int res, bit, ctrl;
163
164 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
165 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
166 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
167
168 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_STATUS + res, BIT(bit));
169}
170
171static struct irq_chip dw_pci_msi_bottom_irq_chip = {
172 .name = "DWPCI-MSI",
173 .irq_ack = dw_pci_bottom_ack,
174 .irq_compose_msi_msg = dw_pci_setup_msi_msg,
175 .irq_mask = dw_pci_bottom_mask,
176 .irq_unmask = dw_pci_bottom_unmask,
177};
178
179static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
180 unsigned int virq, unsigned int nr_irqs,
181 void *args)
182{
183 struct dw_pcie_rp *pp = domain->host_data;
184 unsigned long flags;
185 u32 i;
186 int bit;
187
188 raw_spin_lock_irqsave(&pp->lock, flags);
189
190 bit = bitmap_find_free_region(pp->msi_irq_in_use, pp->num_vectors,
191 order_base_2(nr_irqs));
192
193 raw_spin_unlock_irqrestore(&pp->lock, flags);
194
195 if (bit < 0)
196 return -ENOSPC;
197
198 for (i = 0; i < nr_irqs; i++)
199 irq_domain_set_info(domain, virq + i, bit + i,
200 pp->msi_irq_chip,
201 pp, handle_edge_irq,
202 NULL, NULL);
203
204 return 0;
205}
206
207static void dw_pcie_irq_domain_free(struct irq_domain *domain,
208 unsigned int virq, unsigned int nr_irqs)
209{
210 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
211 struct dw_pcie_rp *pp = domain->host_data;
212 unsigned long flags;
213
214 raw_spin_lock_irqsave(&pp->lock, flags);
215
216 bitmap_release_region(pp->msi_irq_in_use, d->hwirq,
217 order_base_2(nr_irqs));
218
219 raw_spin_unlock_irqrestore(&pp->lock, flags);
220}
221
222static const struct irq_domain_ops dw_pcie_msi_domain_ops = {
223 .alloc = dw_pcie_irq_domain_alloc,
224 .free = dw_pcie_irq_domain_free,
225};
226
227int dw_pcie_allocate_domains(struct dw_pcie_rp *pp)
228{
229 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
230 struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
231
232 pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
233 &dw_pcie_msi_domain_ops, pp);
234 if (!pp->irq_domain) {
235 dev_err(pci->dev, "Failed to create IRQ domain\n");
236 return -ENOMEM;
237 }
238
239 irq_domain_update_bus_token(pp->irq_domain, DOMAIN_BUS_NEXUS);
240
241 pp->msi_domain = pci_msi_create_irq_domain(fwnode,
242 &dw_pcie_msi_domain_info,
243 pp->irq_domain);
244 if (!pp->msi_domain) {
245 dev_err(pci->dev, "Failed to create MSI domain\n");
246 irq_domain_remove(pp->irq_domain);
247 return -ENOMEM;
248 }
249
250 return 0;
251}
252
253static void dw_pcie_free_msi(struct dw_pcie_rp *pp)
254{
255 u32 ctrl;
256
257 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) {
258 if (pp->msi_irq[ctrl] > 0)
259 irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
260 NULL, NULL);
261 }
262
263 irq_domain_remove(pp->msi_domain);
264 irq_domain_remove(pp->irq_domain);
265}
266
267static void dw_pcie_msi_init(struct dw_pcie_rp *pp)
268{
269 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
270 u64 msi_target = (u64)pp->msi_data;
271
272 if (!pci_msi_enabled() || !pp->has_msi_ctrl)
273 return;
274
275 /* Program the msi_data */
276 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_LO, lower_32_bits(msi_target));
277 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target));
278}
279
280static int dw_pcie_parse_split_msi_irq(struct dw_pcie_rp *pp)
281{
282 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
283 struct device *dev = pci->dev;
284 struct platform_device *pdev = to_platform_device(dev);
285 u32 ctrl, max_vectors;
286 int irq;
287
288 /* Parse any "msiX" IRQs described in the devicetree */
289 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) {
290 char msi_name[] = "msiX";
291
292 msi_name[3] = '0' + ctrl;
293 irq = platform_get_irq_byname_optional(pdev, msi_name);
294 if (irq == -ENXIO)
295 break;
296 if (irq < 0)
297 return dev_err_probe(dev, irq,
298 "Failed to parse MSI IRQ '%s'\n",
299 msi_name);
300
301 pp->msi_irq[ctrl] = irq;
302 }
303
304 /* If no "msiX" IRQs, caller should fallback to "msi" IRQ */
305 if (ctrl == 0)
306 return -ENXIO;
307
308 max_vectors = ctrl * MAX_MSI_IRQS_PER_CTRL;
309 if (pp->num_vectors > max_vectors) {
310 dev_warn(dev, "Exceeding number of MSI vectors, limiting to %u\n",
311 max_vectors);
312 pp->num_vectors = max_vectors;
313 }
314 if (!pp->num_vectors)
315 pp->num_vectors = max_vectors;
316
317 return 0;
318}
319
320static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp)
321{
322 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
323 struct device *dev = pci->dev;
324 struct platform_device *pdev = to_platform_device(dev);
325 u64 *msi_vaddr = NULL;
326 int ret;
327 u32 ctrl, num_ctrls;
328
329 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++)
330 pp->irq_mask[ctrl] = ~0;
331
332 if (!pp->msi_irq[0]) {
333 ret = dw_pcie_parse_split_msi_irq(pp);
334 if (ret < 0 && ret != -ENXIO)
335 return ret;
336 }
337
338 if (!pp->num_vectors)
339 pp->num_vectors = MSI_DEF_NUM_VECTORS;
340 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
341
342 if (!pp->msi_irq[0]) {
343 pp->msi_irq[0] = platform_get_irq_byname_optional(pdev, "msi");
344 if (pp->msi_irq[0] < 0) {
345 pp->msi_irq[0] = platform_get_irq(pdev, 0);
346 if (pp->msi_irq[0] < 0)
347 return pp->msi_irq[0];
348 }
349 }
350
351 dev_dbg(dev, "Using %d MSI vectors\n", pp->num_vectors);
352
353 pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
354
355 ret = dw_pcie_allocate_domains(pp);
356 if (ret)
357 return ret;
358
359 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
360 if (pp->msi_irq[ctrl] > 0)
361 irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
362 dw_chained_msi_isr, pp);
363 }
364
365 /*
366 * Even though the iMSI-RX Module supports 64-bit addresses some
367 * peripheral PCIe devices may lack 64-bit message support. In
368 * order not to miss MSI TLPs from those devices the MSI target
369 * address has to be within the lowest 4GB.
370 *
371 * Note until there is a better alternative found the reservation is
372 * done by allocating from the artificially limited DMA-coherent
373 * memory.
374 */
375 ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
376 if (!ret)
377 msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data,
378 GFP_KERNEL);
379
380 if (!msi_vaddr) {
381 dev_warn(dev, "Failed to allocate 32-bit MSI address\n");
382 dma_set_coherent_mask(dev, DMA_BIT_MASK(64));
383 msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data,
384 GFP_KERNEL);
385 if (!msi_vaddr) {
386 dev_err(dev, "Failed to allocate MSI address\n");
387 dw_pcie_free_msi(pp);
388 return -ENOMEM;
389 }
390 }
391
392 return 0;
393}
394
395static void dw_pcie_host_request_msg_tlp_res(struct dw_pcie_rp *pp)
396{
397 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
398 struct resource_entry *win;
399 struct resource *res;
400
401 win = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
402 if (win) {
403 res = devm_kzalloc(pci->dev, sizeof(*res), GFP_KERNEL);
404 if (!res)
405 return;
406
407 /*
408 * Allocate MSG TLP region of size 'region_align' at the end of
409 * the host bridge window.
410 */
411 res->start = win->res->end - pci->region_align + 1;
412 res->end = win->res->end;
413 res->name = "msg";
414 res->flags = win->res->flags | IORESOURCE_BUSY;
415
416 if (!devm_request_resource(pci->dev, win->res, res))
417 pp->msg_res = res;
418 }
419}
420
421int dw_pcie_host_init(struct dw_pcie_rp *pp)
422{
423 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
424 struct device *dev = pci->dev;
425 struct device_node *np = dev->of_node;
426 struct platform_device *pdev = to_platform_device(dev);
427 struct resource_entry *win;
428 struct pci_host_bridge *bridge;
429 struct resource *res;
430 int ret;
431
432 raw_spin_lock_init(&pp->lock);
433
434 ret = dw_pcie_get_resources(pci);
435 if (ret)
436 return ret;
437
438 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
439 if (res) {
440 pp->cfg0_size = resource_size(res);
441 pp->cfg0_base = res->start;
442
443 pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
444 if (IS_ERR(pp->va_cfg0_base))
445 return PTR_ERR(pp->va_cfg0_base);
446 } else {
447 dev_err(dev, "Missing *config* reg space\n");
448 return -ENODEV;
449 }
450
451 bridge = devm_pci_alloc_host_bridge(dev, 0);
452 if (!bridge)
453 return -ENOMEM;
454
455 pp->bridge = bridge;
456
457 /* Get the I/O range from DT */
458 win = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
459 if (win) {
460 pp->io_size = resource_size(win->res);
461 pp->io_bus_addr = win->res->start - win->offset;
462 pp->io_base = pci_pio_to_address(win->res->start);
463 }
464
465 /* Set default bus ops */
466 bridge->ops = &dw_pcie_ops;
467 bridge->child_ops = &dw_child_pcie_ops;
468
469 if (pp->ops->init) {
470 ret = pp->ops->init(pp);
471 if (ret)
472 return ret;
473 }
474
475 if (pci_msi_enabled()) {
476 pp->has_msi_ctrl = !(pp->ops->msi_init ||
477 of_property_present(np, "msi-parent") ||
478 of_property_present(np, "msi-map"));
479
480 /*
481 * For the has_msi_ctrl case the default assignment is handled
482 * in the dw_pcie_msi_host_init().
483 */
484 if (!pp->has_msi_ctrl && !pp->num_vectors) {
485 pp->num_vectors = MSI_DEF_NUM_VECTORS;
486 } else if (pp->num_vectors > MAX_MSI_IRQS) {
487 dev_err(dev, "Invalid number of vectors\n");
488 ret = -EINVAL;
489 goto err_deinit_host;
490 }
491
492 if (pp->ops->msi_init) {
493 ret = pp->ops->msi_init(pp);
494 if (ret < 0)
495 goto err_deinit_host;
496 } else if (pp->has_msi_ctrl) {
497 ret = dw_pcie_msi_host_init(pp);
498 if (ret < 0)
499 goto err_deinit_host;
500 }
501 }
502
503 dw_pcie_version_detect(pci);
504
505 dw_pcie_iatu_detect(pci);
506
507 /*
508 * Allocate the resource for MSG TLP before programming the iATU
509 * outbound window in dw_pcie_setup_rc(). Since the allocation depends
510 * on the value of 'region_align', this has to be done after
511 * dw_pcie_iatu_detect().
512 *
513 * Glue drivers need to set 'use_atu_msg' before dw_pcie_host_init() to
514 * make use of the generic MSG TLP implementation.
515 */
516 if (pp->use_atu_msg)
517 dw_pcie_host_request_msg_tlp_res(pp);
518
519 ret = dw_pcie_edma_detect(pci);
520 if (ret)
521 goto err_free_msi;
522
523 ret = dw_pcie_setup_rc(pp);
524 if (ret)
525 goto err_remove_edma;
526
527 if (!dw_pcie_link_up(pci)) {
528 ret = dw_pcie_start_link(pci);
529 if (ret)
530 goto err_remove_edma;
531 }
532
533 /* Ignore errors, the link may come up later */
534 dw_pcie_wait_for_link(pci);
535
536 bridge->sysdata = pp;
537
538 ret = pci_host_probe(bridge);
539 if (ret)
540 goto err_stop_link;
541
542 if (pp->ops->post_init)
543 pp->ops->post_init(pp);
544
545 return 0;
546
547err_stop_link:
548 dw_pcie_stop_link(pci);
549
550err_remove_edma:
551 dw_pcie_edma_remove(pci);
552
553err_free_msi:
554 if (pp->has_msi_ctrl)
555 dw_pcie_free_msi(pp);
556
557err_deinit_host:
558 if (pp->ops->deinit)
559 pp->ops->deinit(pp);
560
561 return ret;
562}
563EXPORT_SYMBOL_GPL(dw_pcie_host_init);
564
565void dw_pcie_host_deinit(struct dw_pcie_rp *pp)
566{
567 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
568
569 pci_stop_root_bus(pp->bridge->bus);
570 pci_remove_root_bus(pp->bridge->bus);
571
572 dw_pcie_stop_link(pci);
573
574 dw_pcie_edma_remove(pci);
575
576 if (pp->has_msi_ctrl)
577 dw_pcie_free_msi(pp);
578
579 if (pp->ops->deinit)
580 pp->ops->deinit(pp);
581}
582EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
583
584static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
585 unsigned int devfn, int where)
586{
587 struct dw_pcie_rp *pp = bus->sysdata;
588 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
589 struct dw_pcie_ob_atu_cfg atu = { 0 };
590 int type, ret;
591 u32 busdev;
592
593 /*
594 * Checking whether the link is up here is a last line of defense
595 * against platforms that forward errors on the system bus as
596 * SError upon PCI configuration transactions issued when the link
597 * is down. This check is racy by definition and does not stop
598 * the system from triggering an SError if the link goes down
599 * after this check is performed.
600 */
601 if (!dw_pcie_link_up(pci))
602 return NULL;
603
604 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
605 PCIE_ATU_FUNC(PCI_FUNC(devfn));
606
607 if (pci_is_root_bus(bus->parent))
608 type = PCIE_ATU_TYPE_CFG0;
609 else
610 type = PCIE_ATU_TYPE_CFG1;
611
612 atu.type = type;
613 atu.cpu_addr = pp->cfg0_base;
614 atu.pci_addr = busdev;
615 atu.size = pp->cfg0_size;
616
617 ret = dw_pcie_prog_outbound_atu(pci, &atu);
618 if (ret)
619 return NULL;
620
621 return pp->va_cfg0_base + where;
622}
623
624static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
625 int where, int size, u32 *val)
626{
627 struct dw_pcie_rp *pp = bus->sysdata;
628 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
629 struct dw_pcie_ob_atu_cfg atu = { 0 };
630 int ret;
631
632 ret = pci_generic_config_read(bus, devfn, where, size, val);
633 if (ret != PCIBIOS_SUCCESSFUL)
634 return ret;
635
636 if (pp->cfg0_io_shared) {
637 atu.type = PCIE_ATU_TYPE_IO;
638 atu.cpu_addr = pp->io_base;
639 atu.pci_addr = pp->io_bus_addr;
640 atu.size = pp->io_size;
641
642 ret = dw_pcie_prog_outbound_atu(pci, &atu);
643 if (ret)
644 return PCIBIOS_SET_FAILED;
645 }
646
647 return PCIBIOS_SUCCESSFUL;
648}
649
650static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
651 int where, int size, u32 val)
652{
653 struct dw_pcie_rp *pp = bus->sysdata;
654 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
655 struct dw_pcie_ob_atu_cfg atu = { 0 };
656 int ret;
657
658 ret = pci_generic_config_write(bus, devfn, where, size, val);
659 if (ret != PCIBIOS_SUCCESSFUL)
660 return ret;
661
662 if (pp->cfg0_io_shared) {
663 atu.type = PCIE_ATU_TYPE_IO;
664 atu.cpu_addr = pp->io_base;
665 atu.pci_addr = pp->io_bus_addr;
666 atu.size = pp->io_size;
667
668 ret = dw_pcie_prog_outbound_atu(pci, &atu);
669 if (ret)
670 return PCIBIOS_SET_FAILED;
671 }
672
673 return PCIBIOS_SUCCESSFUL;
674}
675
676static struct pci_ops dw_child_pcie_ops = {
677 .map_bus = dw_pcie_other_conf_map_bus,
678 .read = dw_pcie_rd_other_conf,
679 .write = dw_pcie_wr_other_conf,
680};
681
682void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where)
683{
684 struct dw_pcie_rp *pp = bus->sysdata;
685 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
686
687 if (PCI_SLOT(devfn) > 0)
688 return NULL;
689
690 return pci->dbi_base + where;
691}
692EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);
693
694static struct pci_ops dw_pcie_ops = {
695 .map_bus = dw_pcie_own_conf_map_bus,
696 .read = pci_generic_config_read,
697 .write = pci_generic_config_write,
698};
699
700static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
701{
702 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
703 struct dw_pcie_ob_atu_cfg atu = { 0 };
704 struct resource_entry *entry;
705 int i, ret;
706
707 /* Note the very first outbound ATU is used for CFG IOs */
708 if (!pci->num_ob_windows) {
709 dev_err(pci->dev, "No outbound iATU found\n");
710 return -EINVAL;
711 }
712
713 /*
714 * Ensure all out/inbound windows are disabled before proceeding with
715 * the MEM/IO (dma-)ranges setups.
716 */
717 for (i = 0; i < pci->num_ob_windows; i++)
718 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_OB, i);
719
720 for (i = 0; i < pci->num_ib_windows; i++)
721 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, i);
722
723 i = 0;
724 resource_list_for_each_entry(entry, &pp->bridge->windows) {
725 if (resource_type(entry->res) != IORESOURCE_MEM)
726 continue;
727
728 if (pci->num_ob_windows <= ++i)
729 break;
730
731 atu.index = i;
732 atu.type = PCIE_ATU_TYPE_MEM;
733 atu.cpu_addr = entry->res->start;
734 atu.pci_addr = entry->res->start - entry->offset;
735
736 /* Adjust iATU size if MSG TLP region was allocated before */
737 if (pp->msg_res && pp->msg_res->parent == entry->res)
738 atu.size = resource_size(entry->res) -
739 resource_size(pp->msg_res);
740 else
741 atu.size = resource_size(entry->res);
742
743 ret = dw_pcie_prog_outbound_atu(pci, &atu);
744 if (ret) {
745 dev_err(pci->dev, "Failed to set MEM range %pr\n",
746 entry->res);
747 return ret;
748 }
749 }
750
751 if (pp->io_size) {
752 if (pci->num_ob_windows > ++i) {
753 atu.index = i;
754 atu.type = PCIE_ATU_TYPE_IO;
755 atu.cpu_addr = pp->io_base;
756 atu.pci_addr = pp->io_bus_addr;
757 atu.size = pp->io_size;
758
759 ret = dw_pcie_prog_outbound_atu(pci, &atu);
760 if (ret) {
761 dev_err(pci->dev, "Failed to set IO range %pr\n",
762 entry->res);
763 return ret;
764 }
765 } else {
766 pp->cfg0_io_shared = true;
767 }
768 }
769
770 if (pci->num_ob_windows <= i)
771 dev_warn(pci->dev, "Ranges exceed outbound iATU size (%d)\n",
772 pci->num_ob_windows);
773
774 pp->msg_atu_index = i;
775
776 i = 0;
777 resource_list_for_each_entry(entry, &pp->bridge->dma_ranges) {
778 if (resource_type(entry->res) != IORESOURCE_MEM)
779 continue;
780
781 if (pci->num_ib_windows <= i)
782 break;
783
784 ret = dw_pcie_prog_inbound_atu(pci, i++, PCIE_ATU_TYPE_MEM,
785 entry->res->start,
786 entry->res->start - entry->offset,
787 resource_size(entry->res));
788 if (ret) {
789 dev_err(pci->dev, "Failed to set DMA range %pr\n",
790 entry->res);
791 return ret;
792 }
793 }
794
795 if (pci->num_ib_windows <= i)
796 dev_warn(pci->dev, "Dma-ranges exceed inbound iATU size (%u)\n",
797 pci->num_ib_windows);
798
799 return 0;
800}
801
802int dw_pcie_setup_rc(struct dw_pcie_rp *pp)
803{
804 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
805 u32 val, ctrl, num_ctrls;
806 int ret;
807
808 /*
809 * Enable DBI read-only registers for writing/updating configuration.
810 * Write permission gets disabled towards the end of this function.
811 */
812 dw_pcie_dbi_ro_wr_en(pci);
813
814 dw_pcie_setup(pci);
815
816 if (pp->has_msi_ctrl) {
817 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
818
819 /* Initialize IRQ Status array */
820 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
821 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
822 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
823 pp->irq_mask[ctrl]);
824 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
825 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
826 ~0);
827 }
828 }
829
830 dw_pcie_msi_init(pp);
831
832 /* Setup RC BARs */
833 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
834 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
835
836 /* Setup interrupt pins */
837 val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
838 val &= 0xffff00ff;
839 val |= 0x00000100;
840 dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
841
842 /* Setup bus numbers */
843 val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
844 val &= 0xff000000;
845 val |= 0x00ff0100;
846 dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
847
848 /* Setup command register */
849 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
850 val &= 0xffff0000;
851 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
852 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
853 dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
854
855 /*
856 * If the platform provides its own child bus config accesses, it means
857 * the platform uses its own address translation component rather than
858 * ATU, so we should not program the ATU here.
859 */
860 if (pp->bridge->child_ops == &dw_child_pcie_ops) {
861 ret = dw_pcie_iatu_setup(pp);
862 if (ret)
863 return ret;
864 }
865
866 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
867
868 /* Program correct class for RC */
869 dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);
870
871 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
872 val |= PORT_LOGIC_SPEED_CHANGE;
873 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
874
875 dw_pcie_dbi_ro_wr_dis(pci);
876
877 return 0;
878}
879EXPORT_SYMBOL_GPL(dw_pcie_setup_rc);
880
881static int dw_pcie_pme_turn_off(struct dw_pcie *pci)
882{
883 struct dw_pcie_ob_atu_cfg atu = { 0 };
884 void __iomem *mem;
885 int ret;
886
887 if (pci->num_ob_windows <= pci->pp.msg_atu_index)
888 return -ENOSPC;
889
890 if (!pci->pp.msg_res)
891 return -ENOSPC;
892
893 atu.code = PCIE_MSG_CODE_PME_TURN_OFF;
894 atu.routing = PCIE_MSG_TYPE_R_BC;
895 atu.type = PCIE_ATU_TYPE_MSG;
896 atu.size = resource_size(pci->pp.msg_res);
897 atu.index = pci->pp.msg_atu_index;
898
899 atu.cpu_addr = pci->pp.msg_res->start;
900
901 ret = dw_pcie_prog_outbound_atu(pci, &atu);
902 if (ret)
903 return ret;
904
905 mem = ioremap(atu.cpu_addr, pci->region_align);
906 if (!mem)
907 return -ENOMEM;
908
909 /* A dummy write is converted to a Msg TLP */
910 writel(0, mem);
911
912 iounmap(mem);
913
914 return 0;
915}
916
917int dw_pcie_suspend_noirq(struct dw_pcie *pci)
918{
919 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
920 u32 val;
921 int ret = 0;
922
923 /*
924 * If L1SS is supported, then do not put the link into L2 as some
925 * devices such as NVMe expect low resume latency.
926 */
927 if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) & PCI_EXP_LNKCTL_ASPM_L1)
928 return 0;
929
930 if (dw_pcie_get_ltssm(pci) <= DW_PCIE_LTSSM_DETECT_ACT)
931 return 0;
932
933 if (pci->pp.ops->pme_turn_off)
934 pci->pp.ops->pme_turn_off(&pci->pp);
935 else
936 ret = dw_pcie_pme_turn_off(pci);
937
938 if (ret)
939 return ret;
940
941 ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE,
942 PCIE_PME_TO_L2_TIMEOUT_US/10,
943 PCIE_PME_TO_L2_TIMEOUT_US, false, pci);
944 if (ret) {
945 dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val);
946 return ret;
947 }
948
949 dw_pcie_stop_link(pci);
950 if (pci->pp.ops->deinit)
951 pci->pp.ops->deinit(&pci->pp);
952
953 pci->suspended = true;
954
955 return ret;
956}
957EXPORT_SYMBOL_GPL(dw_pcie_suspend_noirq);
958
959int dw_pcie_resume_noirq(struct dw_pcie *pci)
960{
961 int ret;
962
963 if (!pci->suspended)
964 return 0;
965
966 pci->suspended = false;
967
968 if (pci->pp.ops->init) {
969 ret = pci->pp.ops->init(&pci->pp);
970 if (ret) {
971 dev_err(pci->dev, "Host init failed: %d\n", ret);
972 return ret;
973 }
974 }
975
976 dw_pcie_setup_rc(&pci->pp);
977
978 ret = dw_pcie_start_link(pci);
979 if (ret)
980 return ret;
981
982 ret = dw_pcie_wait_for_link(pci);
983 if (ret)
984 return ret;
985
986 return ret;
987}
988EXPORT_SYMBOL_GPL(dw_pcie_resume_noirq);