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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 * http://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/of_address.h>
14#include <linux/of_pci.h>
15#include <linux/pci_regs.h>
16#include <linux/platform_device.h>
17
18#include "../../pci.h"
19#include "pcie-designware.h"
20
21static struct pci_ops dw_pcie_ops;
22
23static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
24 u32 *val)
25{
26 struct dw_pcie *pci;
27
28 if (pp->ops->rd_own_conf)
29 return pp->ops->rd_own_conf(pp, where, size, val);
30
31 pci = to_dw_pcie_from_pp(pp);
32 return dw_pcie_read(pci->dbi_base + where, size, val);
33}
34
35static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
36 u32 val)
37{
38 struct dw_pcie *pci;
39
40 if (pp->ops->wr_own_conf)
41 return pp->ops->wr_own_conf(pp, where, size, val);
42
43 pci = to_dw_pcie_from_pp(pp);
44 return dw_pcie_write(pci->dbi_base + where, size, val);
45}
46
47static void dw_msi_ack_irq(struct irq_data *d)
48{
49 irq_chip_ack_parent(d);
50}
51
52static void dw_msi_mask_irq(struct irq_data *d)
53{
54 pci_msi_mask_irq(d);
55 irq_chip_mask_parent(d);
56}
57
58static void dw_msi_unmask_irq(struct irq_data *d)
59{
60 pci_msi_unmask_irq(d);
61 irq_chip_unmask_parent(d);
62}
63
64static struct irq_chip dw_pcie_msi_irq_chip = {
65 .name = "PCI-MSI",
66 .irq_ack = dw_msi_ack_irq,
67 .irq_mask = dw_msi_mask_irq,
68 .irq_unmask = dw_msi_unmask_irq,
69};
70
71static struct msi_domain_info dw_pcie_msi_domain_info = {
72 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
73 MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
74 .chip = &dw_pcie_msi_irq_chip,
75};
76
77/* MSI int handler */
78irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
79{
80 int i, pos, irq;
81 u32 val, num_ctrls;
82 irqreturn_t ret = IRQ_NONE;
83
84 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
85
86 for (i = 0; i < num_ctrls; i++) {
87 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
88 (i * MSI_REG_CTRL_BLOCK_SIZE),
89 4, &val);
90 if (!val)
91 continue;
92
93 ret = IRQ_HANDLED;
94 pos = 0;
95 while ((pos = find_next_bit((unsigned long *) &val,
96 MAX_MSI_IRQS_PER_CTRL,
97 pos)) != MAX_MSI_IRQS_PER_CTRL) {
98 irq = irq_find_mapping(pp->irq_domain,
99 (i * MAX_MSI_IRQS_PER_CTRL) +
100 pos);
101 generic_handle_irq(irq);
102 pos++;
103 }
104 }
105
106 return ret;
107}
108
109/* Chained MSI interrupt service routine */
110static void dw_chained_msi_isr(struct irq_desc *desc)
111{
112 struct irq_chip *chip = irq_desc_get_chip(desc);
113 struct pcie_port *pp;
114
115 chained_irq_enter(chip, desc);
116
117 pp = irq_desc_get_handler_data(desc);
118 dw_handle_msi_irq(pp);
119
120 chained_irq_exit(chip, desc);
121}
122
123static void dw_pci_setup_msi_msg(struct irq_data *d, struct msi_msg *msg)
124{
125 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
126 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
127 u64 msi_target;
128
129 msi_target = (u64)pp->msi_data;
130
131 msg->address_lo = lower_32_bits(msi_target);
132 msg->address_hi = upper_32_bits(msi_target);
133
134 msg->data = d->hwirq;
135
136 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
137 (int)d->hwirq, msg->address_hi, msg->address_lo);
138}
139
140static int dw_pci_msi_set_affinity(struct irq_data *d,
141 const struct cpumask *mask, bool force)
142{
143 return -EINVAL;
144}
145
146static void dw_pci_bottom_mask(struct irq_data *d)
147{
148 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
149 unsigned int res, bit, ctrl;
150 unsigned long flags;
151
152 raw_spin_lock_irqsave(&pp->lock, flags);
153
154 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
155 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
156 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
157
158 pp->irq_mask[ctrl] |= BIT(bit);
159 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + res, 4,
160 pp->irq_mask[ctrl]);
161
162 raw_spin_unlock_irqrestore(&pp->lock, flags);
163}
164
165static void dw_pci_bottom_unmask(struct irq_data *d)
166{
167 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
168 unsigned int res, bit, ctrl;
169 unsigned long flags;
170
171 raw_spin_lock_irqsave(&pp->lock, flags);
172
173 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
174 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
175 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
176
177 pp->irq_mask[ctrl] &= ~BIT(bit);
178 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + res, 4,
179 pp->irq_mask[ctrl]);
180
181 raw_spin_unlock_irqrestore(&pp->lock, flags);
182}
183
184static void dw_pci_bottom_ack(struct irq_data *d)
185{
186 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
187 unsigned int res, bit, ctrl;
188
189 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
190 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
191 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
192
193 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS + res, 4, BIT(bit));
194}
195
196static struct irq_chip dw_pci_msi_bottom_irq_chip = {
197 .name = "DWPCI-MSI",
198 .irq_ack = dw_pci_bottom_ack,
199 .irq_compose_msi_msg = dw_pci_setup_msi_msg,
200 .irq_set_affinity = dw_pci_msi_set_affinity,
201 .irq_mask = dw_pci_bottom_mask,
202 .irq_unmask = dw_pci_bottom_unmask,
203};
204
205static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
206 unsigned int virq, unsigned int nr_irqs,
207 void *args)
208{
209 struct pcie_port *pp = domain->host_data;
210 unsigned long flags;
211 u32 i;
212 int bit;
213
214 raw_spin_lock_irqsave(&pp->lock, flags);
215
216 bit = bitmap_find_free_region(pp->msi_irq_in_use, pp->num_vectors,
217 order_base_2(nr_irqs));
218
219 raw_spin_unlock_irqrestore(&pp->lock, flags);
220
221 if (bit < 0)
222 return -ENOSPC;
223
224 for (i = 0; i < nr_irqs; i++)
225 irq_domain_set_info(domain, virq + i, bit + i,
226 pp->msi_irq_chip,
227 pp, handle_edge_irq,
228 NULL, NULL);
229
230 return 0;
231}
232
233static void dw_pcie_irq_domain_free(struct irq_domain *domain,
234 unsigned int virq, unsigned int nr_irqs)
235{
236 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
237 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
238 unsigned long flags;
239
240 raw_spin_lock_irqsave(&pp->lock, flags);
241
242 bitmap_release_region(pp->msi_irq_in_use, d->hwirq,
243 order_base_2(nr_irqs));
244
245 raw_spin_unlock_irqrestore(&pp->lock, flags);
246}
247
248static const struct irq_domain_ops dw_pcie_msi_domain_ops = {
249 .alloc = dw_pcie_irq_domain_alloc,
250 .free = dw_pcie_irq_domain_free,
251};
252
253int dw_pcie_allocate_domains(struct pcie_port *pp)
254{
255 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
256 struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
257
258 pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
259 &dw_pcie_msi_domain_ops, pp);
260 if (!pp->irq_domain) {
261 dev_err(pci->dev, "Failed to create IRQ domain\n");
262 return -ENOMEM;
263 }
264
265 pp->msi_domain = pci_msi_create_irq_domain(fwnode,
266 &dw_pcie_msi_domain_info,
267 pp->irq_domain);
268 if (!pp->msi_domain) {
269 dev_err(pci->dev, "Failed to create MSI domain\n");
270 irq_domain_remove(pp->irq_domain);
271 return -ENOMEM;
272 }
273
274 return 0;
275}
276
277void dw_pcie_free_msi(struct pcie_port *pp)
278{
279 if (pp->msi_irq) {
280 irq_set_chained_handler(pp->msi_irq, NULL);
281 irq_set_handler_data(pp->msi_irq, NULL);
282 }
283
284 irq_domain_remove(pp->msi_domain);
285 irq_domain_remove(pp->irq_domain);
286
287 if (pp->msi_page)
288 __free_page(pp->msi_page);
289}
290
291void dw_pcie_msi_init(struct pcie_port *pp)
292{
293 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
294 struct device *dev = pci->dev;
295 u64 msi_target;
296
297 pp->msi_page = alloc_page(GFP_KERNEL);
298 pp->msi_data = dma_map_page(dev, pp->msi_page, 0, PAGE_SIZE,
299 DMA_FROM_DEVICE);
300 if (dma_mapping_error(dev, pp->msi_data)) {
301 dev_err(dev, "Failed to map MSI data\n");
302 __free_page(pp->msi_page);
303 pp->msi_page = NULL;
304 return;
305 }
306 msi_target = (u64)pp->msi_data;
307
308 /* Program the msi_data */
309 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
310 lower_32_bits(msi_target));
311 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
312 upper_32_bits(msi_target));
313}
314EXPORT_SYMBOL_GPL(dw_pcie_msi_init);
315
316int dw_pcie_host_init(struct pcie_port *pp)
317{
318 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
319 struct device *dev = pci->dev;
320 struct device_node *np = dev->of_node;
321 struct platform_device *pdev = to_platform_device(dev);
322 struct resource_entry *win, *tmp;
323 struct pci_bus *child;
324 struct pci_host_bridge *bridge;
325 struct resource *cfg_res;
326 u32 hdr_type;
327 int ret;
328
329 raw_spin_lock_init(&pci->pp.lock);
330
331 cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
332 if (cfg_res) {
333 pp->cfg0_size = resource_size(cfg_res) >> 1;
334 pp->cfg1_size = resource_size(cfg_res) >> 1;
335 pp->cfg0_base = cfg_res->start;
336 pp->cfg1_base = cfg_res->start + pp->cfg0_size;
337 } else if (!pp->va_cfg0_base) {
338 dev_err(dev, "Missing *config* reg space\n");
339 }
340
341 bridge = devm_pci_alloc_host_bridge(dev, 0);
342 if (!bridge)
343 return -ENOMEM;
344
345 ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
346 &bridge->windows, &pp->io_base);
347 if (ret)
348 return ret;
349
350 ret = devm_request_pci_bus_resources(dev, &bridge->windows);
351 if (ret)
352 return ret;
353
354 /* Get the I/O and memory ranges from DT */
355 resource_list_for_each_entry_safe(win, tmp, &bridge->windows) {
356 switch (resource_type(win->res)) {
357 case IORESOURCE_IO:
358 ret = devm_pci_remap_iospace(dev, win->res,
359 pp->io_base);
360 if (ret) {
361 dev_warn(dev, "Error %d: failed to map resource %pR\n",
362 ret, win->res);
363 resource_list_destroy_entry(win);
364 } else {
365 pp->io = win->res;
366 pp->io->name = "I/O";
367 pp->io_size = resource_size(pp->io);
368 pp->io_bus_addr = pp->io->start - win->offset;
369 }
370 break;
371 case IORESOURCE_MEM:
372 pp->mem = win->res;
373 pp->mem->name = "MEM";
374 pp->mem_size = resource_size(pp->mem);
375 pp->mem_bus_addr = pp->mem->start - win->offset;
376 break;
377 case 0:
378 pp->cfg = win->res;
379 pp->cfg0_size = resource_size(pp->cfg) >> 1;
380 pp->cfg1_size = resource_size(pp->cfg) >> 1;
381 pp->cfg0_base = pp->cfg->start;
382 pp->cfg1_base = pp->cfg->start + pp->cfg0_size;
383 break;
384 case IORESOURCE_BUS:
385 pp->busn = win->res;
386 break;
387 }
388 }
389
390 if (!pci->dbi_base) {
391 pci->dbi_base = devm_pci_remap_cfgspace(dev,
392 pp->cfg->start,
393 resource_size(pp->cfg));
394 if (!pci->dbi_base) {
395 dev_err(dev, "Error with ioremap\n");
396 return -ENOMEM;
397 }
398 }
399
400 pp->mem_base = pp->mem->start;
401
402 if (!pp->va_cfg0_base) {
403 pp->va_cfg0_base = devm_pci_remap_cfgspace(dev,
404 pp->cfg0_base, pp->cfg0_size);
405 if (!pp->va_cfg0_base) {
406 dev_err(dev, "Error with ioremap in function\n");
407 return -ENOMEM;
408 }
409 }
410
411 if (!pp->va_cfg1_base) {
412 pp->va_cfg1_base = devm_pci_remap_cfgspace(dev,
413 pp->cfg1_base,
414 pp->cfg1_size);
415 if (!pp->va_cfg1_base) {
416 dev_err(dev, "Error with ioremap\n");
417 return -ENOMEM;
418 }
419 }
420
421 ret = of_property_read_u32(np, "num-viewport", &pci->num_viewport);
422 if (ret)
423 pci->num_viewport = 2;
424
425 if (pci_msi_enabled()) {
426 /*
427 * If a specific SoC driver needs to change the
428 * default number of vectors, it needs to implement
429 * the set_num_vectors callback.
430 */
431 if (!pp->ops->set_num_vectors) {
432 pp->num_vectors = MSI_DEF_NUM_VECTORS;
433 } else {
434 pp->ops->set_num_vectors(pp);
435
436 if (pp->num_vectors > MAX_MSI_IRQS ||
437 pp->num_vectors == 0) {
438 dev_err(dev,
439 "Invalid number of vectors\n");
440 return -EINVAL;
441 }
442 }
443
444 if (!pp->ops->msi_host_init) {
445 pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
446
447 ret = dw_pcie_allocate_domains(pp);
448 if (ret)
449 return ret;
450
451 if (pp->msi_irq)
452 irq_set_chained_handler_and_data(pp->msi_irq,
453 dw_chained_msi_isr,
454 pp);
455 } else {
456 ret = pp->ops->msi_host_init(pp);
457 if (ret < 0)
458 return ret;
459 }
460 }
461
462 if (pp->ops->host_init) {
463 ret = pp->ops->host_init(pp);
464 if (ret)
465 goto err_free_msi;
466 }
467
468 ret = dw_pcie_rd_own_conf(pp, PCI_HEADER_TYPE, 1, &hdr_type);
469 if (ret != PCIBIOS_SUCCESSFUL) {
470 dev_err(pci->dev, "Failed reading PCI_HEADER_TYPE cfg space reg (ret: 0x%x)\n",
471 ret);
472 ret = pcibios_err_to_errno(ret);
473 goto err_free_msi;
474 }
475 if (hdr_type != PCI_HEADER_TYPE_BRIDGE) {
476 dev_err(pci->dev,
477 "PCIe controller is not set to bridge type (hdr_type: 0x%x)!\n",
478 hdr_type);
479 ret = -EIO;
480 goto err_free_msi;
481 }
482
483 pp->root_bus_nr = pp->busn->start;
484
485 bridge->dev.parent = dev;
486 bridge->sysdata = pp;
487 bridge->busnr = pp->root_bus_nr;
488 bridge->ops = &dw_pcie_ops;
489 bridge->map_irq = of_irq_parse_and_map_pci;
490 bridge->swizzle_irq = pci_common_swizzle;
491
492 ret = pci_scan_root_bus_bridge(bridge);
493 if (ret)
494 goto err_free_msi;
495
496 pp->root_bus = bridge->bus;
497
498 if (pp->ops->scan_bus)
499 pp->ops->scan_bus(pp);
500
501 pci_bus_size_bridges(pp->root_bus);
502 pci_bus_assign_resources(pp->root_bus);
503
504 list_for_each_entry(child, &pp->root_bus->children, node)
505 pcie_bus_configure_settings(child);
506
507 pci_bus_add_devices(pp->root_bus);
508 return 0;
509
510err_free_msi:
511 if (pci_msi_enabled() && !pp->ops->msi_host_init)
512 dw_pcie_free_msi(pp);
513 return ret;
514}
515EXPORT_SYMBOL_GPL(dw_pcie_host_init);
516
517void dw_pcie_host_deinit(struct pcie_port *pp)
518{
519 pci_stop_root_bus(pp->root_bus);
520 pci_remove_root_bus(pp->root_bus);
521 if (pci_msi_enabled() && !pp->ops->msi_host_init)
522 dw_pcie_free_msi(pp);
523}
524EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
525
526static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus,
527 u32 devfn, int where, int size, u32 *val,
528 bool write)
529{
530 int ret, type;
531 u32 busdev, cfg_size;
532 u64 cpu_addr;
533 void __iomem *va_cfg_base;
534 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
535
536 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
537 PCIE_ATU_FUNC(PCI_FUNC(devfn));
538
539 if (bus->parent->number == pp->root_bus_nr) {
540 type = PCIE_ATU_TYPE_CFG0;
541 cpu_addr = pp->cfg0_base;
542 cfg_size = pp->cfg0_size;
543 va_cfg_base = pp->va_cfg0_base;
544 } else {
545 type = PCIE_ATU_TYPE_CFG1;
546 cpu_addr = pp->cfg1_base;
547 cfg_size = pp->cfg1_size;
548 va_cfg_base = pp->va_cfg1_base;
549 }
550
551 dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
552 type, cpu_addr,
553 busdev, cfg_size);
554 if (write)
555 ret = dw_pcie_write(va_cfg_base + where, size, *val);
556 else
557 ret = dw_pcie_read(va_cfg_base + where, size, val);
558
559 if (pci->num_viewport <= 2)
560 dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
561 PCIE_ATU_TYPE_IO, pp->io_base,
562 pp->io_bus_addr, pp->io_size);
563
564 return ret;
565}
566
567static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
568 u32 devfn, int where, int size, u32 *val)
569{
570 if (pp->ops->rd_other_conf)
571 return pp->ops->rd_other_conf(pp, bus, devfn, where,
572 size, val);
573
574 return dw_pcie_access_other_conf(pp, bus, devfn, where, size, val,
575 false);
576}
577
578static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
579 u32 devfn, int where, int size, u32 val)
580{
581 if (pp->ops->wr_other_conf)
582 return pp->ops->wr_other_conf(pp, bus, devfn, where,
583 size, val);
584
585 return dw_pcie_access_other_conf(pp, bus, devfn, where, size, &val,
586 true);
587}
588
589static int dw_pcie_valid_device(struct pcie_port *pp, struct pci_bus *bus,
590 int dev)
591{
592 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
593
594 /* If there is no link, then there is no device */
595 if (bus->number != pp->root_bus_nr) {
596 if (!dw_pcie_link_up(pci))
597 return 0;
598 }
599
600 /* Access only one slot on each root port */
601 if (bus->number == pp->root_bus_nr && dev > 0)
602 return 0;
603
604 return 1;
605}
606
607static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
608 int size, u32 *val)
609{
610 struct pcie_port *pp = bus->sysdata;
611
612 if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn))) {
613 *val = 0xffffffff;
614 return PCIBIOS_DEVICE_NOT_FOUND;
615 }
616
617 if (bus->number == pp->root_bus_nr)
618 return dw_pcie_rd_own_conf(pp, where, size, val);
619
620 return dw_pcie_rd_other_conf(pp, bus, devfn, where, size, val);
621}
622
623static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
624 int where, int size, u32 val)
625{
626 struct pcie_port *pp = bus->sysdata;
627
628 if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn)))
629 return PCIBIOS_DEVICE_NOT_FOUND;
630
631 if (bus->number == pp->root_bus_nr)
632 return dw_pcie_wr_own_conf(pp, where, size, val);
633
634 return dw_pcie_wr_other_conf(pp, bus, devfn, where, size, val);
635}
636
637static struct pci_ops dw_pcie_ops = {
638 .read = dw_pcie_rd_conf,
639 .write = dw_pcie_wr_conf,
640};
641
642void dw_pcie_setup_rc(struct pcie_port *pp)
643{
644 u32 val, ctrl, num_ctrls;
645 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
646
647 /*
648 * Enable DBI read-only registers for writing/updating configuration.
649 * Write permission gets disabled towards the end of this function.
650 */
651 dw_pcie_dbi_ro_wr_en(pci);
652
653 dw_pcie_setup(pci);
654
655 if (!pp->ops->msi_host_init) {
656 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
657
658 /* Initialize IRQ Status array */
659 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
660 pp->irq_mask[ctrl] = ~0;
661 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK +
662 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
663 4, pp->irq_mask[ctrl]);
664 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
665 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
666 4, ~0);
667 }
668 }
669
670 /* Setup RC BARs */
671 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
672 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
673
674 /* Setup interrupt pins */
675 val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
676 val &= 0xffff00ff;
677 val |= 0x00000100;
678 dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
679
680 /* Setup bus numbers */
681 val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
682 val &= 0xff000000;
683 val |= 0x00ff0100;
684 dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
685
686 /* Setup command register */
687 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
688 val &= 0xffff0000;
689 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
690 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
691 dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
692
693 /*
694 * If the platform provides ->rd_other_conf, it means the platform
695 * uses its own address translation component rather than ATU, so
696 * we should not program the ATU here.
697 */
698 if (!pp->ops->rd_other_conf) {
699 dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
700 PCIE_ATU_TYPE_MEM, pp->mem_base,
701 pp->mem_bus_addr, pp->mem_size);
702 if (pci->num_viewport > 2)
703 dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX2,
704 PCIE_ATU_TYPE_IO, pp->io_base,
705 pp->io_bus_addr, pp->io_size);
706 }
707
708 dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
709
710 /* Program correct class for RC */
711 dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
712
713 dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
714 val |= PORT_LOGIC_SPEED_CHANGE;
715 dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
716
717 dw_pcie_dbi_ro_wr_dis(pci);
718}
719EXPORT_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/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 "pcie-designware.h"
20
21static struct pci_ops dw_pcie_ops;
22static struct pci_ops dw_child_pcie_ops;
23
24static void dw_msi_ack_irq(struct irq_data *d)
25{
26 irq_chip_ack_parent(d);
27}
28
29static void dw_msi_mask_irq(struct irq_data *d)
30{
31 pci_msi_mask_irq(d);
32 irq_chip_mask_parent(d);
33}
34
35static void dw_msi_unmask_irq(struct irq_data *d)
36{
37 pci_msi_unmask_irq(d);
38 irq_chip_unmask_parent(d);
39}
40
41static struct irq_chip dw_pcie_msi_irq_chip = {
42 .name = "PCI-MSI",
43 .irq_ack = dw_msi_ack_irq,
44 .irq_mask = dw_msi_mask_irq,
45 .irq_unmask = dw_msi_unmask_irq,
46};
47
48static struct msi_domain_info dw_pcie_msi_domain_info = {
49 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
50 MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
51 .chip = &dw_pcie_msi_irq_chip,
52};
53
54/* MSI int handler */
55irqreturn_t dw_handle_msi_irq(struct dw_pcie_rp *pp)
56{
57 int i, pos;
58 unsigned long val;
59 u32 status, num_ctrls;
60 irqreturn_t ret = IRQ_NONE;
61 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
62
63 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
64
65 for (i = 0; i < num_ctrls; i++) {
66 status = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS +
67 (i * MSI_REG_CTRL_BLOCK_SIZE));
68 if (!status)
69 continue;
70
71 ret = IRQ_HANDLED;
72 val = status;
73 pos = 0;
74 while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
75 pos)) != MAX_MSI_IRQS_PER_CTRL) {
76 generic_handle_domain_irq(pp->irq_domain,
77 (i * MAX_MSI_IRQS_PER_CTRL) +
78 pos);
79 pos++;
80 }
81 }
82
83 return ret;
84}
85
86/* Chained MSI interrupt service routine */
87static void dw_chained_msi_isr(struct irq_desc *desc)
88{
89 struct irq_chip *chip = irq_desc_get_chip(desc);
90 struct dw_pcie_rp *pp;
91
92 chained_irq_enter(chip, desc);
93
94 pp = irq_desc_get_handler_data(desc);
95 dw_handle_msi_irq(pp);
96
97 chained_irq_exit(chip, desc);
98}
99
100static void dw_pci_setup_msi_msg(struct irq_data *d, struct msi_msg *msg)
101{
102 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
103 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
104 u64 msi_target;
105
106 msi_target = (u64)pp->msi_data;
107
108 msg->address_lo = lower_32_bits(msi_target);
109 msg->address_hi = upper_32_bits(msi_target);
110
111 msg->data = d->hwirq;
112
113 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
114 (int)d->hwirq, msg->address_hi, msg->address_lo);
115}
116
117static int dw_pci_msi_set_affinity(struct irq_data *d,
118 const struct cpumask *mask, bool force)
119{
120 return -EINVAL;
121}
122
123static void dw_pci_bottom_mask(struct irq_data *d)
124{
125 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
126 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
127 unsigned int res, bit, ctrl;
128 unsigned long flags;
129
130 raw_spin_lock_irqsave(&pp->lock, flags);
131
132 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
133 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
134 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
135
136 pp->irq_mask[ctrl] |= BIT(bit);
137 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
138
139 raw_spin_unlock_irqrestore(&pp->lock, flags);
140}
141
142static void dw_pci_bottom_unmask(struct irq_data *d)
143{
144 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
145 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
146 unsigned int res, bit, ctrl;
147 unsigned long flags;
148
149 raw_spin_lock_irqsave(&pp->lock, flags);
150
151 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
152 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
153 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
154
155 pp->irq_mask[ctrl] &= ~BIT(bit);
156 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
157
158 raw_spin_unlock_irqrestore(&pp->lock, flags);
159}
160
161static void dw_pci_bottom_ack(struct irq_data *d)
162{
163 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
164 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
165 unsigned int res, bit, ctrl;
166
167 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
168 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
169 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
170
171 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_STATUS + res, BIT(bit));
172}
173
174static struct irq_chip dw_pci_msi_bottom_irq_chip = {
175 .name = "DWPCI-MSI",
176 .irq_ack = dw_pci_bottom_ack,
177 .irq_compose_msi_msg = dw_pci_setup_msi_msg,
178 .irq_set_affinity = dw_pci_msi_set_affinity,
179 .irq_mask = dw_pci_bottom_mask,
180 .irq_unmask = dw_pci_bottom_unmask,
181};
182
183static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
184 unsigned int virq, unsigned int nr_irqs,
185 void *args)
186{
187 struct dw_pcie_rp *pp = domain->host_data;
188 unsigned long flags;
189 u32 i;
190 int bit;
191
192 raw_spin_lock_irqsave(&pp->lock, flags);
193
194 bit = bitmap_find_free_region(pp->msi_irq_in_use, pp->num_vectors,
195 order_base_2(nr_irqs));
196
197 raw_spin_unlock_irqrestore(&pp->lock, flags);
198
199 if (bit < 0)
200 return -ENOSPC;
201
202 for (i = 0; i < nr_irqs; i++)
203 irq_domain_set_info(domain, virq + i, bit + i,
204 pp->msi_irq_chip,
205 pp, handle_edge_irq,
206 NULL, NULL);
207
208 return 0;
209}
210
211static void dw_pcie_irq_domain_free(struct irq_domain *domain,
212 unsigned int virq, unsigned int nr_irqs)
213{
214 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
215 struct dw_pcie_rp *pp = domain->host_data;
216 unsigned long flags;
217
218 raw_spin_lock_irqsave(&pp->lock, flags);
219
220 bitmap_release_region(pp->msi_irq_in_use, d->hwirq,
221 order_base_2(nr_irqs));
222
223 raw_spin_unlock_irqrestore(&pp->lock, flags);
224}
225
226static const struct irq_domain_ops dw_pcie_msi_domain_ops = {
227 .alloc = dw_pcie_irq_domain_alloc,
228 .free = dw_pcie_irq_domain_free,
229};
230
231int dw_pcie_allocate_domains(struct dw_pcie_rp *pp)
232{
233 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
234 struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
235
236 pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
237 &dw_pcie_msi_domain_ops, pp);
238 if (!pp->irq_domain) {
239 dev_err(pci->dev, "Failed to create IRQ domain\n");
240 return -ENOMEM;
241 }
242
243 irq_domain_update_bus_token(pp->irq_domain, DOMAIN_BUS_NEXUS);
244
245 pp->msi_domain = pci_msi_create_irq_domain(fwnode,
246 &dw_pcie_msi_domain_info,
247 pp->irq_domain);
248 if (!pp->msi_domain) {
249 dev_err(pci->dev, "Failed to create MSI domain\n");
250 irq_domain_remove(pp->irq_domain);
251 return -ENOMEM;
252 }
253
254 return 0;
255}
256
257static void dw_pcie_free_msi(struct dw_pcie_rp *pp)
258{
259 u32 ctrl;
260
261 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) {
262 if (pp->msi_irq[ctrl] > 0)
263 irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
264 NULL, NULL);
265 }
266
267 irq_domain_remove(pp->msi_domain);
268 irq_domain_remove(pp->irq_domain);
269}
270
271static void dw_pcie_msi_init(struct dw_pcie_rp *pp)
272{
273 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
274 u64 msi_target = (u64)pp->msi_data;
275
276 if (!pci_msi_enabled() || !pp->has_msi_ctrl)
277 return;
278
279 /* Program the msi_data */
280 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_LO, lower_32_bits(msi_target));
281 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target));
282}
283
284static int dw_pcie_parse_split_msi_irq(struct dw_pcie_rp *pp)
285{
286 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
287 struct device *dev = pci->dev;
288 struct platform_device *pdev = to_platform_device(dev);
289 u32 ctrl, max_vectors;
290 int irq;
291
292 /* Parse any "msiX" IRQs described in the devicetree */
293 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) {
294 char msi_name[] = "msiX";
295
296 msi_name[3] = '0' + ctrl;
297 irq = platform_get_irq_byname_optional(pdev, msi_name);
298 if (irq == -ENXIO)
299 break;
300 if (irq < 0)
301 return dev_err_probe(dev, irq,
302 "Failed to parse MSI IRQ '%s'\n",
303 msi_name);
304
305 pp->msi_irq[ctrl] = irq;
306 }
307
308 /* If no "msiX" IRQs, caller should fallback to "msi" IRQ */
309 if (ctrl == 0)
310 return -ENXIO;
311
312 max_vectors = ctrl * MAX_MSI_IRQS_PER_CTRL;
313 if (pp->num_vectors > max_vectors) {
314 dev_warn(dev, "Exceeding number of MSI vectors, limiting to %u\n",
315 max_vectors);
316 pp->num_vectors = max_vectors;
317 }
318 if (!pp->num_vectors)
319 pp->num_vectors = max_vectors;
320
321 return 0;
322}
323
324static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp)
325{
326 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
327 struct device *dev = pci->dev;
328 struct platform_device *pdev = to_platform_device(dev);
329 u64 *msi_vaddr;
330 int ret;
331 u32 ctrl, num_ctrls;
332
333 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++)
334 pp->irq_mask[ctrl] = ~0;
335
336 if (!pp->msi_irq[0]) {
337 ret = dw_pcie_parse_split_msi_irq(pp);
338 if (ret < 0 && ret != -ENXIO)
339 return ret;
340 }
341
342 if (!pp->num_vectors)
343 pp->num_vectors = MSI_DEF_NUM_VECTORS;
344 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
345
346 if (!pp->msi_irq[0]) {
347 pp->msi_irq[0] = platform_get_irq_byname_optional(pdev, "msi");
348 if (pp->msi_irq[0] < 0) {
349 pp->msi_irq[0] = platform_get_irq(pdev, 0);
350 if (pp->msi_irq[0] < 0)
351 return pp->msi_irq[0];
352 }
353 }
354
355 dev_dbg(dev, "Using %d MSI vectors\n", pp->num_vectors);
356
357 pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
358
359 ret = dw_pcie_allocate_domains(pp);
360 if (ret)
361 return ret;
362
363 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
364 if (pp->msi_irq[ctrl] > 0)
365 irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
366 dw_chained_msi_isr, pp);
367 }
368
369 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
370 if (ret)
371 dev_warn(dev, "Failed to set DMA mask to 32-bit. Devices with only 32-bit MSI support may not work properly\n");
372
373 msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data,
374 GFP_KERNEL);
375 if (!msi_vaddr) {
376 dev_err(dev, "Failed to alloc and map MSI data\n");
377 dw_pcie_free_msi(pp);
378 return -ENOMEM;
379 }
380
381 return 0;
382}
383
384int dw_pcie_host_init(struct dw_pcie_rp *pp)
385{
386 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
387 struct device *dev = pci->dev;
388 struct device_node *np = dev->of_node;
389 struct platform_device *pdev = to_platform_device(dev);
390 struct resource_entry *win;
391 struct pci_host_bridge *bridge;
392 struct resource *res;
393 int ret;
394
395 raw_spin_lock_init(&pp->lock);
396
397 ret = dw_pcie_get_resources(pci);
398 if (ret)
399 return ret;
400
401 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
402 if (res) {
403 pp->cfg0_size = resource_size(res);
404 pp->cfg0_base = res->start;
405
406 pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
407 if (IS_ERR(pp->va_cfg0_base))
408 return PTR_ERR(pp->va_cfg0_base);
409 } else {
410 dev_err(dev, "Missing *config* reg space\n");
411 return -ENODEV;
412 }
413
414 bridge = devm_pci_alloc_host_bridge(dev, 0);
415 if (!bridge)
416 return -ENOMEM;
417
418 pp->bridge = bridge;
419
420 /* Get the I/O range from DT */
421 win = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
422 if (win) {
423 pp->io_size = resource_size(win->res);
424 pp->io_bus_addr = win->res->start - win->offset;
425 pp->io_base = pci_pio_to_address(win->res->start);
426 }
427
428 /* Set default bus ops */
429 bridge->ops = &dw_pcie_ops;
430 bridge->child_ops = &dw_child_pcie_ops;
431
432 if (pp->ops->host_init) {
433 ret = pp->ops->host_init(pp);
434 if (ret)
435 return ret;
436 }
437
438 if (pci_msi_enabled()) {
439 pp->has_msi_ctrl = !(pp->ops->msi_host_init ||
440 of_property_read_bool(np, "msi-parent") ||
441 of_property_read_bool(np, "msi-map"));
442
443 /*
444 * For the has_msi_ctrl case the default assignment is handled
445 * in the dw_pcie_msi_host_init().
446 */
447 if (!pp->has_msi_ctrl && !pp->num_vectors) {
448 pp->num_vectors = MSI_DEF_NUM_VECTORS;
449 } else if (pp->num_vectors > MAX_MSI_IRQS) {
450 dev_err(dev, "Invalid number of vectors\n");
451 ret = -EINVAL;
452 goto err_deinit_host;
453 }
454
455 if (pp->ops->msi_host_init) {
456 ret = pp->ops->msi_host_init(pp);
457 if (ret < 0)
458 goto err_deinit_host;
459 } else if (pp->has_msi_ctrl) {
460 ret = dw_pcie_msi_host_init(pp);
461 if (ret < 0)
462 goto err_deinit_host;
463 }
464 }
465
466 dw_pcie_version_detect(pci);
467
468 dw_pcie_iatu_detect(pci);
469
470 ret = dw_pcie_setup_rc(pp);
471 if (ret)
472 goto err_free_msi;
473
474 if (!dw_pcie_link_up(pci)) {
475 ret = dw_pcie_start_link(pci);
476 if (ret)
477 goto err_free_msi;
478 }
479
480 /* Ignore errors, the link may come up later */
481 dw_pcie_wait_for_link(pci);
482
483 bridge->sysdata = pp;
484
485 ret = pci_host_probe(bridge);
486 if (ret)
487 goto err_stop_link;
488
489 return 0;
490
491err_stop_link:
492 dw_pcie_stop_link(pci);
493
494err_free_msi:
495 if (pp->has_msi_ctrl)
496 dw_pcie_free_msi(pp);
497
498err_deinit_host:
499 if (pp->ops->host_deinit)
500 pp->ops->host_deinit(pp);
501
502 return ret;
503}
504EXPORT_SYMBOL_GPL(dw_pcie_host_init);
505
506void dw_pcie_host_deinit(struct dw_pcie_rp *pp)
507{
508 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
509
510 pci_stop_root_bus(pp->bridge->bus);
511 pci_remove_root_bus(pp->bridge->bus);
512
513 dw_pcie_stop_link(pci);
514
515 if (pp->has_msi_ctrl)
516 dw_pcie_free_msi(pp);
517
518 if (pp->ops->host_deinit)
519 pp->ops->host_deinit(pp);
520}
521EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
522
523static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
524 unsigned int devfn, int where)
525{
526 struct dw_pcie_rp *pp = bus->sysdata;
527 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
528 int type, ret;
529 u32 busdev;
530
531 /*
532 * Checking whether the link is up here is a last line of defense
533 * against platforms that forward errors on the system bus as
534 * SError upon PCI configuration transactions issued when the link
535 * is down. This check is racy by definition and does not stop
536 * the system from triggering an SError if the link goes down
537 * after this check is performed.
538 */
539 if (!dw_pcie_link_up(pci))
540 return NULL;
541
542 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
543 PCIE_ATU_FUNC(PCI_FUNC(devfn));
544
545 if (pci_is_root_bus(bus->parent))
546 type = PCIE_ATU_TYPE_CFG0;
547 else
548 type = PCIE_ATU_TYPE_CFG1;
549
550 ret = dw_pcie_prog_outbound_atu(pci, 0, type, pp->cfg0_base, busdev,
551 pp->cfg0_size);
552 if (ret)
553 return NULL;
554
555 return pp->va_cfg0_base + where;
556}
557
558static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
559 int where, int size, u32 *val)
560{
561 struct dw_pcie_rp *pp = bus->sysdata;
562 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
563 int ret;
564
565 ret = pci_generic_config_read(bus, devfn, where, size, val);
566 if (ret != PCIBIOS_SUCCESSFUL)
567 return ret;
568
569 if (pp->cfg0_io_shared) {
570 ret = dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO,
571 pp->io_base, pp->io_bus_addr,
572 pp->io_size);
573 if (ret)
574 return PCIBIOS_SET_FAILED;
575 }
576
577 return PCIBIOS_SUCCESSFUL;
578}
579
580static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
581 int where, int size, u32 val)
582{
583 struct dw_pcie_rp *pp = bus->sysdata;
584 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
585 int ret;
586
587 ret = pci_generic_config_write(bus, devfn, where, size, val);
588 if (ret != PCIBIOS_SUCCESSFUL)
589 return ret;
590
591 if (pp->cfg0_io_shared) {
592 ret = dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO,
593 pp->io_base, pp->io_bus_addr,
594 pp->io_size);
595 if (ret)
596 return PCIBIOS_SET_FAILED;
597 }
598
599 return PCIBIOS_SUCCESSFUL;
600}
601
602static struct pci_ops dw_child_pcie_ops = {
603 .map_bus = dw_pcie_other_conf_map_bus,
604 .read = dw_pcie_rd_other_conf,
605 .write = dw_pcie_wr_other_conf,
606};
607
608void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where)
609{
610 struct dw_pcie_rp *pp = bus->sysdata;
611 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
612
613 if (PCI_SLOT(devfn) > 0)
614 return NULL;
615
616 return pci->dbi_base + where;
617}
618EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);
619
620static struct pci_ops dw_pcie_ops = {
621 .map_bus = dw_pcie_own_conf_map_bus,
622 .read = pci_generic_config_read,
623 .write = pci_generic_config_write,
624};
625
626static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
627{
628 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
629 struct resource_entry *entry;
630 int i, ret;
631
632 /* Note the very first outbound ATU is used for CFG IOs */
633 if (!pci->num_ob_windows) {
634 dev_err(pci->dev, "No outbound iATU found\n");
635 return -EINVAL;
636 }
637
638 /*
639 * Ensure all out/inbound windows are disabled before proceeding with
640 * the MEM/IO (dma-)ranges setups.
641 */
642 for (i = 0; i < pci->num_ob_windows; i++)
643 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_OB, i);
644
645 for (i = 0; i < pci->num_ib_windows; i++)
646 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, i);
647
648 i = 0;
649 resource_list_for_each_entry(entry, &pp->bridge->windows) {
650 if (resource_type(entry->res) != IORESOURCE_MEM)
651 continue;
652
653 if (pci->num_ob_windows <= ++i)
654 break;
655
656 ret = dw_pcie_prog_outbound_atu(pci, i, PCIE_ATU_TYPE_MEM,
657 entry->res->start,
658 entry->res->start - entry->offset,
659 resource_size(entry->res));
660 if (ret) {
661 dev_err(pci->dev, "Failed to set MEM range %pr\n",
662 entry->res);
663 return ret;
664 }
665 }
666
667 if (pp->io_size) {
668 if (pci->num_ob_windows > ++i) {
669 ret = dw_pcie_prog_outbound_atu(pci, i, PCIE_ATU_TYPE_IO,
670 pp->io_base,
671 pp->io_bus_addr,
672 pp->io_size);
673 if (ret) {
674 dev_err(pci->dev, "Failed to set IO range %pr\n",
675 entry->res);
676 return ret;
677 }
678 } else {
679 pp->cfg0_io_shared = true;
680 }
681 }
682
683 if (pci->num_ob_windows <= i)
684 dev_warn(pci->dev, "Ranges exceed outbound iATU size (%d)\n",
685 pci->num_ob_windows);
686
687 i = 0;
688 resource_list_for_each_entry(entry, &pp->bridge->dma_ranges) {
689 if (resource_type(entry->res) != IORESOURCE_MEM)
690 continue;
691
692 if (pci->num_ib_windows <= i)
693 break;
694
695 ret = dw_pcie_prog_inbound_atu(pci, i++, PCIE_ATU_TYPE_MEM,
696 entry->res->start,
697 entry->res->start - entry->offset,
698 resource_size(entry->res));
699 if (ret) {
700 dev_err(pci->dev, "Failed to set DMA range %pr\n",
701 entry->res);
702 return ret;
703 }
704 }
705
706 if (pci->num_ib_windows <= i)
707 dev_warn(pci->dev, "Dma-ranges exceed inbound iATU size (%u)\n",
708 pci->num_ib_windows);
709
710 return 0;
711}
712
713int dw_pcie_setup_rc(struct dw_pcie_rp *pp)
714{
715 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
716 u32 val, ctrl, num_ctrls;
717 int ret;
718
719 /*
720 * Enable DBI read-only registers for writing/updating configuration.
721 * Write permission gets disabled towards the end of this function.
722 */
723 dw_pcie_dbi_ro_wr_en(pci);
724
725 dw_pcie_setup(pci);
726
727 if (pp->has_msi_ctrl) {
728 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
729
730 /* Initialize IRQ Status array */
731 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
732 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
733 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
734 pp->irq_mask[ctrl]);
735 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
736 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
737 ~0);
738 }
739 }
740
741 dw_pcie_msi_init(pp);
742
743 /* Setup RC BARs */
744 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
745 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
746
747 /* Setup interrupt pins */
748 val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
749 val &= 0xffff00ff;
750 val |= 0x00000100;
751 dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
752
753 /* Setup bus numbers */
754 val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
755 val &= 0xff000000;
756 val |= 0x00ff0100;
757 dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
758
759 /* Setup command register */
760 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
761 val &= 0xffff0000;
762 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
763 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
764 dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
765
766 /*
767 * If the platform provides its own child bus config accesses, it means
768 * the platform uses its own address translation component rather than
769 * ATU, so we should not program the ATU here.
770 */
771 if (pp->bridge->child_ops == &dw_child_pcie_ops) {
772 ret = dw_pcie_iatu_setup(pp);
773 if (ret)
774 return ret;
775 }
776
777 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
778
779 /* Program correct class for RC */
780 dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);
781
782 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
783 val |= PORT_LOGIC_SPEED_CHANGE;
784 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
785
786 dw_pcie_dbi_ro_wr_dis(pci);
787
788 return 0;
789}
790EXPORT_SYMBOL_GPL(dw_pcie_setup_rc);