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/irqchip/chained_irq.h>
12#include <linux/irqdomain.h>
13#include <linux/msi.h>
14#include <linux/of_address.h>
15#include <linux/of_pci.h>
16#include <linux/pci_regs.h>
17#include <linux/platform_device.h>
18
19#include "../../pci.h"
20#include "pcie-designware.h"
21
22static struct pci_ops dw_pcie_ops;
23static struct pci_ops dw_child_pcie_ops;
24
25static void dw_msi_ack_irq(struct irq_data *d)
26{
27 irq_chip_ack_parent(d);
28}
29
30static void dw_msi_mask_irq(struct irq_data *d)
31{
32 pci_msi_mask_irq(d);
33 irq_chip_mask_parent(d);
34}
35
36static void dw_msi_unmask_irq(struct irq_data *d)
37{
38 pci_msi_unmask_irq(d);
39 irq_chip_unmask_parent(d);
40}
41
42static struct irq_chip dw_pcie_msi_irq_chip = {
43 .name = "PCI-MSI",
44 .irq_ack = dw_msi_ack_irq,
45 .irq_mask = dw_msi_mask_irq,
46 .irq_unmask = dw_msi_unmask_irq,
47};
48
49static struct msi_domain_info dw_pcie_msi_domain_info = {
50 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
51 MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
52 .chip = &dw_pcie_msi_irq_chip,
53};
54
55/* MSI int handler */
56irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
57{
58 int i, pos, irq;
59 unsigned long val;
60 u32 status, num_ctrls;
61 irqreturn_t ret = IRQ_NONE;
62 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
63
64 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
65
66 for (i = 0; i < num_ctrls; i++) {
67 status = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS +
68 (i * MSI_REG_CTRL_BLOCK_SIZE));
69 if (!status)
70 continue;
71
72 ret = IRQ_HANDLED;
73 val = status;
74 pos = 0;
75 while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
76 pos)) != MAX_MSI_IRQS_PER_CTRL) {
77 irq = irq_find_mapping(pp->irq_domain,
78 (i * MAX_MSI_IRQS_PER_CTRL) +
79 pos);
80 generic_handle_irq(irq);
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 pcie_port *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 pcie_port *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 pcie_port *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 pcie_port *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 pcie_port *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 pcie_port *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 pcie_port *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 pcie_port *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 pcie_port *pp)
260{
261 if (pp->msi_irq)
262 irq_set_chained_handler_and_data(pp->msi_irq, NULL, NULL);
263
264 irq_domain_remove(pp->msi_domain);
265 irq_domain_remove(pp->irq_domain);
266
267 if (pp->msi_data) {
268 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
269 struct device *dev = pci->dev;
270
271 dma_unmap_single_attrs(dev, pp->msi_data, sizeof(pp->msi_msg),
272 DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
273 }
274}
275
276static void dw_pcie_msi_init(struct pcie_port *pp)
277{
278 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
279 u64 msi_target = (u64)pp->msi_data;
280
281 if (!pci_msi_enabled() || !pp->has_msi_ctrl)
282 return;
283
284 /* Program the msi_data */
285 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_LO, lower_32_bits(msi_target));
286 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target));
287}
288
289int dw_pcie_host_init(struct pcie_port *pp)
290{
291 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
292 struct device *dev = pci->dev;
293 struct device_node *np = dev->of_node;
294 struct platform_device *pdev = to_platform_device(dev);
295 struct resource_entry *win;
296 struct pci_host_bridge *bridge;
297 struct resource *cfg_res;
298 int ret;
299
300 raw_spin_lock_init(&pci->pp.lock);
301
302 cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
303 if (cfg_res) {
304 pp->cfg0_size = resource_size(cfg_res);
305 pp->cfg0_base = cfg_res->start;
306
307 pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, cfg_res);
308 if (IS_ERR(pp->va_cfg0_base))
309 return PTR_ERR(pp->va_cfg0_base);
310 } else {
311 dev_err(dev, "Missing *config* reg space\n");
312 return -ENODEV;
313 }
314
315 if (!pci->dbi_base) {
316 struct resource *dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
317 pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_res);
318 if (IS_ERR(pci->dbi_base))
319 return PTR_ERR(pci->dbi_base);
320 }
321
322 bridge = devm_pci_alloc_host_bridge(dev, 0);
323 if (!bridge)
324 return -ENOMEM;
325
326 pp->bridge = bridge;
327
328 /* Get the I/O range from DT */
329 win = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
330 if (win) {
331 pp->io_size = resource_size(win->res);
332 pp->io_bus_addr = win->res->start - win->offset;
333 pp->io_base = pci_pio_to_address(win->res->start);
334 }
335
336 if (pci->link_gen < 1)
337 pci->link_gen = of_pci_get_max_link_speed(np);
338
339 if (pci_msi_enabled()) {
340 pp->has_msi_ctrl = !(pp->ops->msi_host_init ||
341 of_property_read_bool(np, "msi-parent") ||
342 of_property_read_bool(np, "msi-map"));
343
344 if (!pp->num_vectors) {
345 pp->num_vectors = MSI_DEF_NUM_VECTORS;
346 } else if (pp->num_vectors > MAX_MSI_IRQS) {
347 dev_err(dev, "Invalid number of vectors\n");
348 return -EINVAL;
349 }
350
351 if (pp->ops->msi_host_init) {
352 ret = pp->ops->msi_host_init(pp);
353 if (ret < 0)
354 return ret;
355 } else if (pp->has_msi_ctrl) {
356 if (!pp->msi_irq) {
357 pp->msi_irq = platform_get_irq_byname_optional(pdev, "msi");
358 if (pp->msi_irq < 0) {
359 pp->msi_irq = platform_get_irq(pdev, 0);
360 if (pp->msi_irq < 0)
361 return pp->msi_irq;
362 }
363 }
364
365 pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
366
367 ret = dw_pcie_allocate_domains(pp);
368 if (ret)
369 return ret;
370
371 if (pp->msi_irq > 0)
372 irq_set_chained_handler_and_data(pp->msi_irq,
373 dw_chained_msi_isr,
374 pp);
375
376 ret = dma_set_mask(pci->dev, DMA_BIT_MASK(32));
377 if (ret)
378 dev_warn(pci->dev, "Failed to set DMA mask to 32-bit. Devices with only 32-bit MSI support may not work properly\n");
379
380 pp->msi_data = dma_map_single_attrs(pci->dev, &pp->msi_msg,
381 sizeof(pp->msi_msg),
382 DMA_FROM_DEVICE,
383 DMA_ATTR_SKIP_CPU_SYNC);
384 if (dma_mapping_error(pci->dev, pp->msi_data)) {
385 dev_err(pci->dev, "Failed to map MSI data\n");
386 pp->msi_data = 0;
387 goto err_free_msi;
388 }
389 }
390 }
391
392 /* Set default bus ops */
393 bridge->ops = &dw_pcie_ops;
394 bridge->child_ops = &dw_child_pcie_ops;
395
396 if (pp->ops->host_init) {
397 ret = pp->ops->host_init(pp);
398 if (ret)
399 goto err_free_msi;
400 }
401 dw_pcie_iatu_detect(pci);
402
403 dw_pcie_setup_rc(pp);
404
405 if (!dw_pcie_link_up(pci) && pci->ops && pci->ops->start_link) {
406 ret = pci->ops->start_link(pci);
407 if (ret)
408 goto err_free_msi;
409 }
410
411 /* Ignore errors, the link may come up later */
412 dw_pcie_wait_for_link(pci);
413
414 bridge->sysdata = pp;
415
416 ret = pci_host_probe(bridge);
417 if (!ret)
418 return 0;
419
420err_free_msi:
421 if (pp->has_msi_ctrl)
422 dw_pcie_free_msi(pp);
423 return ret;
424}
425EXPORT_SYMBOL_GPL(dw_pcie_host_init);
426
427void dw_pcie_host_deinit(struct pcie_port *pp)
428{
429 pci_stop_root_bus(pp->bridge->bus);
430 pci_remove_root_bus(pp->bridge->bus);
431 if (pp->has_msi_ctrl)
432 dw_pcie_free_msi(pp);
433}
434EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
435
436static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
437 unsigned int devfn, int where)
438{
439 int type;
440 u32 busdev;
441 struct pcie_port *pp = bus->sysdata;
442 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
443
444 /*
445 * Checking whether the link is up here is a last line of defense
446 * against platforms that forward errors on the system bus as
447 * SError upon PCI configuration transactions issued when the link
448 * is down. This check is racy by definition and does not stop
449 * the system from triggering an SError if the link goes down
450 * after this check is performed.
451 */
452 if (!dw_pcie_link_up(pci))
453 return NULL;
454
455 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
456 PCIE_ATU_FUNC(PCI_FUNC(devfn));
457
458 if (pci_is_root_bus(bus->parent))
459 type = PCIE_ATU_TYPE_CFG0;
460 else
461 type = PCIE_ATU_TYPE_CFG1;
462
463
464 dw_pcie_prog_outbound_atu(pci, 0, type, pp->cfg0_base, busdev, pp->cfg0_size);
465
466 return pp->va_cfg0_base + where;
467}
468
469static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
470 int where, int size, u32 *val)
471{
472 int ret;
473 struct pcie_port *pp = bus->sysdata;
474 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
475
476 ret = pci_generic_config_read(bus, devfn, where, size, val);
477
478 if (!ret && pci->io_cfg_atu_shared)
479 dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO, pp->io_base,
480 pp->io_bus_addr, pp->io_size);
481
482 return ret;
483}
484
485static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
486 int where, int size, u32 val)
487{
488 int ret;
489 struct pcie_port *pp = bus->sysdata;
490 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
491
492 ret = pci_generic_config_write(bus, devfn, where, size, val);
493
494 if (!ret && pci->io_cfg_atu_shared)
495 dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO, pp->io_base,
496 pp->io_bus_addr, pp->io_size);
497
498 return ret;
499}
500
501static struct pci_ops dw_child_pcie_ops = {
502 .map_bus = dw_pcie_other_conf_map_bus,
503 .read = dw_pcie_rd_other_conf,
504 .write = dw_pcie_wr_other_conf,
505};
506
507void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where)
508{
509 struct pcie_port *pp = bus->sysdata;
510 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
511
512 if (PCI_SLOT(devfn) > 0)
513 return NULL;
514
515 return pci->dbi_base + where;
516}
517EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);
518
519static struct pci_ops dw_pcie_ops = {
520 .map_bus = dw_pcie_own_conf_map_bus,
521 .read = pci_generic_config_read,
522 .write = pci_generic_config_write,
523};
524
525void dw_pcie_setup_rc(struct pcie_port *pp)
526{
527 int i;
528 u32 val, ctrl, num_ctrls;
529 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
530
531 /*
532 * Enable DBI read-only registers for writing/updating configuration.
533 * Write permission gets disabled towards the end of this function.
534 */
535 dw_pcie_dbi_ro_wr_en(pci);
536
537 dw_pcie_setup(pci);
538
539 if (pp->has_msi_ctrl) {
540 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
541
542 /* Initialize IRQ Status array */
543 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
544 pp->irq_mask[ctrl] = ~0;
545 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
546 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
547 pp->irq_mask[ctrl]);
548 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
549 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
550 ~0);
551 }
552 }
553
554 dw_pcie_msi_init(pp);
555
556 /* Setup RC BARs */
557 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
558 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
559
560 /* Setup interrupt pins */
561 val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
562 val &= 0xffff00ff;
563 val |= 0x00000100;
564 dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
565
566 /* Setup bus numbers */
567 val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
568 val &= 0xff000000;
569 val |= 0x00ff0100;
570 dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
571
572 /* Setup command register */
573 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
574 val &= 0xffff0000;
575 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
576 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
577 dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
578
579 /* Ensure all outbound windows are disabled so there are multiple matches */
580 for (i = 0; i < pci->num_ob_windows; i++)
581 dw_pcie_disable_atu(pci, i, DW_PCIE_REGION_OUTBOUND);
582
583 /*
584 * If the platform provides its own child bus config accesses, it means
585 * the platform uses its own address translation component rather than
586 * ATU, so we should not program the ATU here.
587 */
588 if (pp->bridge->child_ops == &dw_child_pcie_ops) {
589 int atu_idx = 0;
590 struct resource_entry *entry;
591
592 /* Get last memory resource entry */
593 resource_list_for_each_entry(entry, &pp->bridge->windows) {
594 if (resource_type(entry->res) != IORESOURCE_MEM)
595 continue;
596
597 if (pci->num_ob_windows <= ++atu_idx)
598 break;
599
600 dw_pcie_prog_outbound_atu(pci, atu_idx,
601 PCIE_ATU_TYPE_MEM, entry->res->start,
602 entry->res->start - entry->offset,
603 resource_size(entry->res));
604 }
605
606 if (pp->io_size) {
607 if (pci->num_ob_windows > ++atu_idx)
608 dw_pcie_prog_outbound_atu(pci, atu_idx,
609 PCIE_ATU_TYPE_IO, pp->io_base,
610 pp->io_bus_addr, pp->io_size);
611 else
612 pci->io_cfg_atu_shared = true;
613 }
614
615 if (pci->num_ob_windows <= atu_idx)
616 dev_warn(pci->dev, "Resources exceed number of ATU entries (%d)",
617 pci->num_ob_windows);
618 }
619
620 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
621
622 /* Program correct class for RC */
623 dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);
624
625 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
626 val |= PORT_LOGIC_SPEED_CHANGE;
627 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
628
629 dw_pcie_dbi_ro_wr_dis(pci);
630}
631EXPORT_SYMBOL_GPL(dw_pcie_setup_rc);
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 = NULL;
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 msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data,
384 GFP_KERNEL);
385
386 if (!msi_vaddr) {
387 dev_warn(dev, "Failed to allocate 32-bit MSI address\n");
388 dma_set_coherent_mask(dev, DMA_BIT_MASK(64));
389 msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data,
390 GFP_KERNEL);
391 if (!msi_vaddr) {
392 dev_err(dev, "Failed to allocate MSI address\n");
393 dw_pcie_free_msi(pp);
394 return -ENOMEM;
395 }
396 }
397
398 return 0;
399}
400
401int dw_pcie_host_init(struct dw_pcie_rp *pp)
402{
403 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
404 struct device *dev = pci->dev;
405 struct device_node *np = dev->of_node;
406 struct platform_device *pdev = to_platform_device(dev);
407 struct resource_entry *win;
408 struct pci_host_bridge *bridge;
409 struct resource *res;
410 int ret;
411
412 raw_spin_lock_init(&pp->lock);
413
414 ret = dw_pcie_get_resources(pci);
415 if (ret)
416 return ret;
417
418 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
419 if (res) {
420 pp->cfg0_size = resource_size(res);
421 pp->cfg0_base = res->start;
422
423 pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
424 if (IS_ERR(pp->va_cfg0_base))
425 return PTR_ERR(pp->va_cfg0_base);
426 } else {
427 dev_err(dev, "Missing *config* reg space\n");
428 return -ENODEV;
429 }
430
431 bridge = devm_pci_alloc_host_bridge(dev, 0);
432 if (!bridge)
433 return -ENOMEM;
434
435 pp->bridge = bridge;
436
437 /* Get the I/O range from DT */
438 win = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
439 if (win) {
440 pp->io_size = resource_size(win->res);
441 pp->io_bus_addr = win->res->start - win->offset;
442 pp->io_base = pci_pio_to_address(win->res->start);
443 }
444
445 /* Set default bus ops */
446 bridge->ops = &dw_pcie_ops;
447 bridge->child_ops = &dw_child_pcie_ops;
448
449 if (pp->ops->init) {
450 ret = pp->ops->init(pp);
451 if (ret)
452 return ret;
453 }
454
455 if (pci_msi_enabled()) {
456 pp->has_msi_ctrl = !(pp->ops->msi_init ||
457 of_property_read_bool(np, "msi-parent") ||
458 of_property_read_bool(np, "msi-map"));
459
460 /*
461 * For the has_msi_ctrl case the default assignment is handled
462 * in the dw_pcie_msi_host_init().
463 */
464 if (!pp->has_msi_ctrl && !pp->num_vectors) {
465 pp->num_vectors = MSI_DEF_NUM_VECTORS;
466 } else if (pp->num_vectors > MAX_MSI_IRQS) {
467 dev_err(dev, "Invalid number of vectors\n");
468 ret = -EINVAL;
469 goto err_deinit_host;
470 }
471
472 if (pp->ops->msi_init) {
473 ret = pp->ops->msi_init(pp);
474 if (ret < 0)
475 goto err_deinit_host;
476 } else if (pp->has_msi_ctrl) {
477 ret = dw_pcie_msi_host_init(pp);
478 if (ret < 0)
479 goto err_deinit_host;
480 }
481 }
482
483 dw_pcie_version_detect(pci);
484
485 dw_pcie_iatu_detect(pci);
486
487 ret = dw_pcie_edma_detect(pci);
488 if (ret)
489 goto err_free_msi;
490
491 ret = dw_pcie_setup_rc(pp);
492 if (ret)
493 goto err_remove_edma;
494
495 if (!dw_pcie_link_up(pci)) {
496 ret = dw_pcie_start_link(pci);
497 if (ret)
498 goto err_remove_edma;
499 }
500
501 /* Ignore errors, the link may come up later */
502 dw_pcie_wait_for_link(pci);
503
504 bridge->sysdata = pp;
505
506 ret = pci_host_probe(bridge);
507 if (ret)
508 goto err_stop_link;
509
510 if (pp->ops->post_init)
511 pp->ops->post_init(pp);
512
513 return 0;
514
515err_stop_link:
516 dw_pcie_stop_link(pci);
517
518err_remove_edma:
519 dw_pcie_edma_remove(pci);
520
521err_free_msi:
522 if (pp->has_msi_ctrl)
523 dw_pcie_free_msi(pp);
524
525err_deinit_host:
526 if (pp->ops->deinit)
527 pp->ops->deinit(pp);
528
529 return ret;
530}
531EXPORT_SYMBOL_GPL(dw_pcie_host_init);
532
533void dw_pcie_host_deinit(struct dw_pcie_rp *pp)
534{
535 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
536
537 pci_stop_root_bus(pp->bridge->bus);
538 pci_remove_root_bus(pp->bridge->bus);
539
540 dw_pcie_stop_link(pci);
541
542 dw_pcie_edma_remove(pci);
543
544 if (pp->has_msi_ctrl)
545 dw_pcie_free_msi(pp);
546
547 if (pp->ops->deinit)
548 pp->ops->deinit(pp);
549}
550EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
551
552static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
553 unsigned int devfn, int where)
554{
555 struct dw_pcie_rp *pp = bus->sysdata;
556 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
557 int type, ret;
558 u32 busdev;
559
560 /*
561 * Checking whether the link is up here is a last line of defense
562 * against platforms that forward errors on the system bus as
563 * SError upon PCI configuration transactions issued when the link
564 * is down. This check is racy by definition and does not stop
565 * the system from triggering an SError if the link goes down
566 * after this check is performed.
567 */
568 if (!dw_pcie_link_up(pci))
569 return NULL;
570
571 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
572 PCIE_ATU_FUNC(PCI_FUNC(devfn));
573
574 if (pci_is_root_bus(bus->parent))
575 type = PCIE_ATU_TYPE_CFG0;
576 else
577 type = PCIE_ATU_TYPE_CFG1;
578
579 ret = dw_pcie_prog_outbound_atu(pci, 0, type, pp->cfg0_base, busdev,
580 pp->cfg0_size);
581 if (ret)
582 return NULL;
583
584 return pp->va_cfg0_base + where;
585}
586
587static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
588 int where, int size, u32 *val)
589{
590 struct dw_pcie_rp *pp = bus->sysdata;
591 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
592 int ret;
593
594 ret = pci_generic_config_read(bus, devfn, where, size, val);
595 if (ret != PCIBIOS_SUCCESSFUL)
596 return ret;
597
598 if (pp->cfg0_io_shared) {
599 ret = dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO,
600 pp->io_base, pp->io_bus_addr,
601 pp->io_size);
602 if (ret)
603 return PCIBIOS_SET_FAILED;
604 }
605
606 return PCIBIOS_SUCCESSFUL;
607}
608
609static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
610 int where, int size, u32 val)
611{
612 struct dw_pcie_rp *pp = bus->sysdata;
613 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
614 int ret;
615
616 ret = pci_generic_config_write(bus, devfn, where, size, val);
617 if (ret != PCIBIOS_SUCCESSFUL)
618 return ret;
619
620 if (pp->cfg0_io_shared) {
621 ret = dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO,
622 pp->io_base, pp->io_bus_addr,
623 pp->io_size);
624 if (ret)
625 return PCIBIOS_SET_FAILED;
626 }
627
628 return PCIBIOS_SUCCESSFUL;
629}
630
631static struct pci_ops dw_child_pcie_ops = {
632 .map_bus = dw_pcie_other_conf_map_bus,
633 .read = dw_pcie_rd_other_conf,
634 .write = dw_pcie_wr_other_conf,
635};
636
637void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where)
638{
639 struct dw_pcie_rp *pp = bus->sysdata;
640 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
641
642 if (PCI_SLOT(devfn) > 0)
643 return NULL;
644
645 return pci->dbi_base + where;
646}
647EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);
648
649static struct pci_ops dw_pcie_ops = {
650 .map_bus = dw_pcie_own_conf_map_bus,
651 .read = pci_generic_config_read,
652 .write = pci_generic_config_write,
653};
654
655static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
656{
657 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
658 struct resource_entry *entry;
659 int i, ret;
660
661 /* Note the very first outbound ATU is used for CFG IOs */
662 if (!pci->num_ob_windows) {
663 dev_err(pci->dev, "No outbound iATU found\n");
664 return -EINVAL;
665 }
666
667 /*
668 * Ensure all out/inbound windows are disabled before proceeding with
669 * the MEM/IO (dma-)ranges setups.
670 */
671 for (i = 0; i < pci->num_ob_windows; i++)
672 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_OB, i);
673
674 for (i = 0; i < pci->num_ib_windows; i++)
675 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, i);
676
677 i = 0;
678 resource_list_for_each_entry(entry, &pp->bridge->windows) {
679 if (resource_type(entry->res) != IORESOURCE_MEM)
680 continue;
681
682 if (pci->num_ob_windows <= ++i)
683 break;
684
685 ret = dw_pcie_prog_outbound_atu(pci, i, PCIE_ATU_TYPE_MEM,
686 entry->res->start,
687 entry->res->start - entry->offset,
688 resource_size(entry->res));
689 if (ret) {
690 dev_err(pci->dev, "Failed to set MEM range %pr\n",
691 entry->res);
692 return ret;
693 }
694 }
695
696 if (pp->io_size) {
697 if (pci->num_ob_windows > ++i) {
698 ret = dw_pcie_prog_outbound_atu(pci, i, PCIE_ATU_TYPE_IO,
699 pp->io_base,
700 pp->io_bus_addr,
701 pp->io_size);
702 if (ret) {
703 dev_err(pci->dev, "Failed to set IO range %pr\n",
704 entry->res);
705 return ret;
706 }
707 } else {
708 pp->cfg0_io_shared = true;
709 }
710 }
711
712 if (pci->num_ob_windows <= i)
713 dev_warn(pci->dev, "Ranges exceed outbound iATU size (%d)\n",
714 pci->num_ob_windows);
715
716 i = 0;
717 resource_list_for_each_entry(entry, &pp->bridge->dma_ranges) {
718 if (resource_type(entry->res) != IORESOURCE_MEM)
719 continue;
720
721 if (pci->num_ib_windows <= i)
722 break;
723
724 ret = dw_pcie_prog_inbound_atu(pci, i++, PCIE_ATU_TYPE_MEM,
725 entry->res->start,
726 entry->res->start - entry->offset,
727 resource_size(entry->res));
728 if (ret) {
729 dev_err(pci->dev, "Failed to set DMA range %pr\n",
730 entry->res);
731 return ret;
732 }
733 }
734
735 if (pci->num_ib_windows <= i)
736 dev_warn(pci->dev, "Dma-ranges exceed inbound iATU size (%u)\n",
737 pci->num_ib_windows);
738
739 return 0;
740}
741
742int dw_pcie_setup_rc(struct dw_pcie_rp *pp)
743{
744 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
745 u32 val, ctrl, num_ctrls;
746 int ret;
747
748 /*
749 * Enable DBI read-only registers for writing/updating configuration.
750 * Write permission gets disabled towards the end of this function.
751 */
752 dw_pcie_dbi_ro_wr_en(pci);
753
754 dw_pcie_setup(pci);
755
756 if (pp->has_msi_ctrl) {
757 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
758
759 /* Initialize IRQ Status array */
760 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
761 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
762 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
763 pp->irq_mask[ctrl]);
764 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
765 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
766 ~0);
767 }
768 }
769
770 dw_pcie_msi_init(pp);
771
772 /* Setup RC BARs */
773 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
774 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
775
776 /* Setup interrupt pins */
777 val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
778 val &= 0xffff00ff;
779 val |= 0x00000100;
780 dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
781
782 /* Setup bus numbers */
783 val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
784 val &= 0xff000000;
785 val |= 0x00ff0100;
786 dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
787
788 /* Setup command register */
789 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
790 val &= 0xffff0000;
791 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
792 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
793 dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
794
795 /*
796 * If the platform provides its own child bus config accesses, it means
797 * the platform uses its own address translation component rather than
798 * ATU, so we should not program the ATU here.
799 */
800 if (pp->bridge->child_ops == &dw_child_pcie_ops) {
801 ret = dw_pcie_iatu_setup(pp);
802 if (ret)
803 return ret;
804 }
805
806 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
807
808 /* Program correct class for RC */
809 dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);
810
811 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
812 val |= PORT_LOGIC_SPEED_CHANGE;
813 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
814
815 dw_pcie_dbi_ro_wr_dis(pci);
816
817 return 0;
818}
819EXPORT_SYMBOL_GPL(dw_pcie_setup_rc);
820
821int dw_pcie_suspend_noirq(struct dw_pcie *pci)
822{
823 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
824 u32 val;
825 int ret;
826
827 /*
828 * If L1SS is supported, then do not put the link into L2 as some
829 * devices such as NVMe expect low resume latency.
830 */
831 if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) & PCI_EXP_LNKCTL_ASPM_L1)
832 return 0;
833
834 if (dw_pcie_get_ltssm(pci) <= DW_PCIE_LTSSM_DETECT_ACT)
835 return 0;
836
837 if (!pci->pp.ops->pme_turn_off)
838 return 0;
839
840 pci->pp.ops->pme_turn_off(&pci->pp);
841
842 ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE,
843 PCIE_PME_TO_L2_TIMEOUT_US/10,
844 PCIE_PME_TO_L2_TIMEOUT_US, false, pci);
845 if (ret) {
846 dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val);
847 return ret;
848 }
849
850 if (pci->pp.ops->deinit)
851 pci->pp.ops->deinit(&pci->pp);
852
853 pci->suspended = true;
854
855 return ret;
856}
857EXPORT_SYMBOL_GPL(dw_pcie_suspend_noirq);
858
859int dw_pcie_resume_noirq(struct dw_pcie *pci)
860{
861 int ret;
862
863 if (!pci->suspended)
864 return 0;
865
866 pci->suspended = false;
867
868 if (pci->pp.ops->init) {
869 ret = pci->pp.ops->init(&pci->pp);
870 if (ret) {
871 dev_err(pci->dev, "Host init failed: %d\n", ret);
872 return ret;
873 }
874 }
875
876 dw_pcie_setup_rc(&pci->pp);
877
878 ret = dw_pcie_start_link(pci);
879 if (ret)
880 return ret;
881
882 ret = dw_pcie_wait_for_link(pci);
883 if (ret)
884 return ret;
885
886 return ret;
887}
888EXPORT_SYMBOL_GPL(dw_pcie_resume_noirq);