1 // SPDX-License-Identifier: GPL-2.0
3 * Synopsys DesignWare PCIe host controller driver
5 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
6 * https://www.samsung.com
8 * Author: Jingoo Han <jg1.han@samsung.com>
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>
19 #include "../../pci.h"
20 #include "pcie-designware.h"
22 static struct pci_ops dw_pcie_ops;
23 static struct pci_ops dw_child_pcie_ops;
25 static void dw_msi_ack_irq(struct irq_data *d)
27 irq_chip_ack_parent(d);
30 static void dw_msi_mask_irq(struct irq_data *d)
33 irq_chip_mask_parent(d);
36 static void dw_msi_unmask_irq(struct irq_data *d)
38 pci_msi_unmask_irq(d);
39 irq_chip_unmask_parent(d);
42 static struct irq_chip dw_pcie_msi_irq_chip = {
44 .irq_ack = dw_msi_ack_irq,
45 .irq_mask = dw_msi_mask_irq,
46 .irq_unmask = dw_msi_unmask_irq,
49 static 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,
56 irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
60 u32 status, num_ctrls;
61 irqreturn_t ret = IRQ_NONE;
62 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
64 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
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));
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) +
80 generic_handle_irq(irq);
88 /* Chained MSI interrupt service routine */
89 static void dw_chained_msi_isr(struct irq_desc *desc)
91 struct irq_chip *chip = irq_desc_get_chip(desc);
94 chained_irq_enter(chip, desc);
96 pp = irq_desc_get_handler_data(desc);
97 dw_handle_msi_irq(pp);
99 chained_irq_exit(chip, desc);
102 static void dw_pci_setup_msi_msg(struct irq_data *d, struct msi_msg *msg)
104 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
105 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
108 msi_target = (u64)pp->msi_data;
110 msg->address_lo = lower_32_bits(msi_target);
111 msg->address_hi = upper_32_bits(msi_target);
113 msg->data = d->hwirq;
115 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
116 (int)d->hwirq, msg->address_hi, msg->address_lo);
119 static int dw_pci_msi_set_affinity(struct irq_data *d,
120 const struct cpumask *mask, bool force)
125 static void dw_pci_bottom_mask(struct irq_data *d)
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;
132 raw_spin_lock_irqsave(&pp->lock, flags);
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;
138 pp->irq_mask[ctrl] |= BIT(bit);
139 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
141 raw_spin_unlock_irqrestore(&pp->lock, flags);
144 static void dw_pci_bottom_unmask(struct irq_data *d)
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;
151 raw_spin_lock_irqsave(&pp->lock, flags);
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;
157 pp->irq_mask[ctrl] &= ~BIT(bit);
158 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
160 raw_spin_unlock_irqrestore(&pp->lock, flags);
163 static void dw_pci_bottom_ack(struct irq_data *d)
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;
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;
173 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_STATUS + res, BIT(bit));
176 static struct irq_chip dw_pci_msi_bottom_irq_chip = {
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,
185 static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
186 unsigned int virq, unsigned int nr_irqs,
189 struct pcie_port *pp = domain->host_data;
194 raw_spin_lock_irqsave(&pp->lock, flags);
196 bit = bitmap_find_free_region(pp->msi_irq_in_use, pp->num_vectors,
197 order_base_2(nr_irqs));
199 raw_spin_unlock_irqrestore(&pp->lock, flags);
204 for (i = 0; i < nr_irqs; i++)
205 irq_domain_set_info(domain, virq + i, bit + i,
213 static void dw_pcie_irq_domain_free(struct irq_domain *domain,
214 unsigned int virq, unsigned int nr_irqs)
216 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
217 struct pcie_port *pp = domain->host_data;
220 raw_spin_lock_irqsave(&pp->lock, flags);
222 bitmap_release_region(pp->msi_irq_in_use, d->hwirq,
223 order_base_2(nr_irqs));
225 raw_spin_unlock_irqrestore(&pp->lock, flags);
228 static const struct irq_domain_ops dw_pcie_msi_domain_ops = {
229 .alloc = dw_pcie_irq_domain_alloc,
230 .free = dw_pcie_irq_domain_free,
233 int dw_pcie_allocate_domains(struct pcie_port *pp)
235 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
236 struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
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");
245 irq_domain_update_bus_token(pp->irq_domain, DOMAIN_BUS_NEXUS);
247 pp->msi_domain = pci_msi_create_irq_domain(fwnode,
248 &dw_pcie_msi_domain_info,
250 if (!pp->msi_domain) {
251 dev_err(pci->dev, "Failed to create MSI domain\n");
252 irq_domain_remove(pp->irq_domain);
259 void dw_pcie_free_msi(struct pcie_port *pp)
262 irq_set_chained_handler(pp->msi_irq, NULL);
263 irq_set_handler_data(pp->msi_irq, NULL);
266 irq_domain_remove(pp->msi_domain);
267 irq_domain_remove(pp->irq_domain);
270 __free_page(pp->msi_page);
273 void dw_pcie_msi_init(struct pcie_port *pp)
275 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
276 struct device *dev = pci->dev;
279 pp->msi_page = alloc_page(GFP_KERNEL);
280 pp->msi_data = dma_map_page(dev, pp->msi_page, 0, PAGE_SIZE,
282 if (dma_mapping_error(dev, pp->msi_data)) {
283 dev_err(dev, "Failed to map MSI data\n");
284 __free_page(pp->msi_page);
288 msi_target = (u64)pp->msi_data;
290 /* Program the msi_data */
291 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_LO, lower_32_bits(msi_target));
292 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target));
294 EXPORT_SYMBOL_GPL(dw_pcie_msi_init);
296 int dw_pcie_host_init(struct pcie_port *pp)
298 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
299 struct device *dev = pci->dev;
300 struct device_node *np = dev->of_node;
301 struct platform_device *pdev = to_platform_device(dev);
302 struct resource_entry *win;
303 struct pci_host_bridge *bridge;
304 struct resource *cfg_res;
307 raw_spin_lock_init(&pci->pp.lock);
309 cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
311 pp->cfg0_size = resource_size(cfg_res);
312 pp->cfg0_base = cfg_res->start;
313 } else if (!pp->va_cfg0_base) {
314 dev_err(dev, "Missing *config* reg space\n");
317 bridge = devm_pci_alloc_host_bridge(dev, 0);
323 /* Get the I/O and memory ranges from DT */
324 resource_list_for_each_entry(win, &bridge->windows) {
325 switch (resource_type(win->res)) {
327 pp->io_size = resource_size(win->res);
328 pp->io_bus_addr = win->res->start - win->offset;
329 pp->io_base = pci_pio_to_address(win->res->start);
332 dev_err(dev, "Missing *config* reg space\n");
333 pp->cfg0_size = resource_size(win->res);
334 pp->cfg0_base = win->res->start;
335 if (!pci->dbi_base) {
336 pci->dbi_base = devm_pci_remap_cfgspace(dev,
339 if (!pci->dbi_base) {
340 dev_err(dev, "Error with ioremap\n");
348 if (!pp->va_cfg0_base) {
349 pp->va_cfg0_base = devm_pci_remap_cfgspace(dev,
350 pp->cfg0_base, pp->cfg0_size);
351 if (!pp->va_cfg0_base) {
352 dev_err(dev, "Error with ioremap in function\n");
357 ret = of_property_read_u32(np, "num-viewport", &pci->num_viewport);
359 pci->num_viewport = 2;
361 if (pci_msi_enabled()) {
363 * If a specific SoC driver needs to change the
364 * default number of vectors, it needs to implement
365 * the set_num_vectors callback.
367 if (!pp->ops->set_num_vectors) {
368 pp->num_vectors = MSI_DEF_NUM_VECTORS;
370 pp->ops->set_num_vectors(pp);
372 if (pp->num_vectors > MAX_MSI_IRQS ||
373 pp->num_vectors == 0) {
375 "Invalid number of vectors\n");
380 if (!pp->ops->msi_host_init) {
381 pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
383 ret = dw_pcie_allocate_domains(pp);
388 irq_set_chained_handler_and_data(pp->msi_irq,
392 ret = pp->ops->msi_host_init(pp);
398 /* Set default bus ops */
399 bridge->ops = &dw_pcie_ops;
400 bridge->child_ops = &dw_child_pcie_ops;
402 if (pp->ops->host_init) {
403 ret = pp->ops->host_init(pp);
408 bridge->sysdata = pp;
410 ret = pci_host_probe(bridge);
415 if (pci_msi_enabled() && !pp->ops->msi_host_init)
416 dw_pcie_free_msi(pp);
419 EXPORT_SYMBOL_GPL(dw_pcie_host_init);
421 void dw_pcie_host_deinit(struct pcie_port *pp)
423 pci_stop_root_bus(pp->bridge->bus);
424 pci_remove_root_bus(pp->bridge->bus);
425 if (pci_msi_enabled() && !pp->ops->msi_host_init)
426 dw_pcie_free_msi(pp);
428 EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
430 static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
431 unsigned int devfn, int where)
435 struct pcie_port *pp = bus->sysdata;
436 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
438 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
439 PCIE_ATU_FUNC(PCI_FUNC(devfn));
441 if (pci_is_root_bus(bus->parent))
442 type = PCIE_ATU_TYPE_CFG0;
444 type = PCIE_ATU_TYPE_CFG1;
447 dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
449 busdev, pp->cfg0_size);
451 return pp->va_cfg0_base + where;
454 static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
455 int where, int size, u32 *val)
458 struct pcie_port *pp = bus->sysdata;
459 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
461 ret = pci_generic_config_read(bus, devfn, where, size, val);
463 if (!ret && pci->num_viewport <= 2)
464 dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
465 PCIE_ATU_TYPE_IO, pp->io_base,
466 pp->io_bus_addr, pp->io_size);
471 static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
472 int where, int size, u32 val)
475 struct pcie_port *pp = bus->sysdata;
476 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
478 ret = pci_generic_config_write(bus, devfn, where, size, val);
480 if (!ret && pci->num_viewport <= 2)
481 dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
482 PCIE_ATU_TYPE_IO, pp->io_base,
483 pp->io_bus_addr, pp->io_size);
488 static struct pci_ops dw_child_pcie_ops = {
489 .map_bus = dw_pcie_other_conf_map_bus,
490 .read = dw_pcie_rd_other_conf,
491 .write = dw_pcie_wr_other_conf,
494 void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where)
496 struct pcie_port *pp = bus->sysdata;
497 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
499 if (PCI_SLOT(devfn) > 0)
502 return pci->dbi_base + where;
504 EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);
506 static struct pci_ops dw_pcie_ops = {
507 .map_bus = dw_pcie_own_conf_map_bus,
508 .read = pci_generic_config_read,
509 .write = pci_generic_config_write,
512 void dw_pcie_setup_rc(struct pcie_port *pp)
514 u32 val, ctrl, num_ctrls;
515 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
518 * Enable DBI read-only registers for writing/updating configuration.
519 * Write permission gets disabled towards the end of this function.
521 dw_pcie_dbi_ro_wr_en(pci);
525 if (!pp->ops->msi_host_init) {
526 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
528 /* Initialize IRQ Status array */
529 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
530 pp->irq_mask[ctrl] = ~0;
531 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
532 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
534 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
535 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
541 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
542 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
544 /* Setup interrupt pins */
545 val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
548 dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
550 /* Setup bus numbers */
551 val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
554 dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
556 /* Setup command register */
557 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
559 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
560 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
561 dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
564 * If the platform provides its own child bus config accesses, it means
565 * the platform uses its own address translation component rather than
566 * ATU, so we should not program the ATU here.
568 if (pp->bridge->child_ops == &dw_child_pcie_ops) {
569 struct resource_entry *entry =
570 resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
572 dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
573 PCIE_ATU_TYPE_MEM, entry->res->start,
574 entry->res->start - entry->offset,
575 resource_size(entry->res));
576 if (pci->num_viewport > 2)
577 dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX2,
578 PCIE_ATU_TYPE_IO, pp->io_base,
579 pp->io_bus_addr, pp->io_size);
582 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
584 /* Program correct class for RC */
585 dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);
587 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
588 val |= PORT_LOGIC_SPEED_CHANGE;
589 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
591 dw_pcie_dbi_ro_wr_dis(pci);
593 EXPORT_SYMBOL_GPL(dw_pcie_setup_rc);