2 * Synopsys Designware PCIe host controller driver
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
7 * Author: Jingoo Han <jg1.han@samsung.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/irq.h>
15 #include <linux/irqdomain.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/msi.h>
19 #include <linux/of_address.h>
20 #include <linux/of_pci.h>
21 #include <linux/pci.h>
22 #include <linux/pci_regs.h>
23 #include <linux/platform_device.h>
24 #include <linux/types.h>
26 #include "pcie-designware.h"
28 /* Synopsis specific PCIE configuration registers */
29 #define PCIE_PORT_LINK_CONTROL 0x710
30 #define PORT_LINK_MODE_MASK (0x3f << 16)
31 #define PORT_LINK_MODE_1_LANES (0x1 << 16)
32 #define PORT_LINK_MODE_2_LANES (0x3 << 16)
33 #define PORT_LINK_MODE_4_LANES (0x7 << 16)
34 #define PORT_LINK_MODE_8_LANES (0xf << 16)
36 #define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
37 #define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
38 #define PORT_LOGIC_LINK_WIDTH_MASK (0x1f << 8)
39 #define PORT_LOGIC_LINK_WIDTH_1_LANES (0x1 << 8)
40 #define PORT_LOGIC_LINK_WIDTH_2_LANES (0x2 << 8)
41 #define PORT_LOGIC_LINK_WIDTH_4_LANES (0x4 << 8)
42 #define PORT_LOGIC_LINK_WIDTH_8_LANES (0x8 << 8)
44 #define PCIE_MSI_ADDR_LO 0x820
45 #define PCIE_MSI_ADDR_HI 0x824
46 #define PCIE_MSI_INTR0_ENABLE 0x828
47 #define PCIE_MSI_INTR0_MASK 0x82C
48 #define PCIE_MSI_INTR0_STATUS 0x830
50 #define PCIE_ATU_VIEWPORT 0x900
51 #define PCIE_ATU_REGION_INBOUND (0x1 << 31)
52 #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
53 #define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
54 #define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
55 #define PCIE_ATU_CR1 0x904
56 #define PCIE_ATU_TYPE_MEM (0x0 << 0)
57 #define PCIE_ATU_TYPE_IO (0x2 << 0)
58 #define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
59 #define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
60 #define PCIE_ATU_CR2 0x908
61 #define PCIE_ATU_ENABLE (0x1 << 31)
62 #define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
63 #define PCIE_ATU_LOWER_BASE 0x90C
64 #define PCIE_ATU_UPPER_BASE 0x910
65 #define PCIE_ATU_LIMIT 0x914
66 #define PCIE_ATU_LOWER_TARGET 0x918
67 #define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
68 #define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
69 #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
70 #define PCIE_ATU_UPPER_TARGET 0x91C
72 static struct hw_pci dw_pci;
74 static unsigned long global_io_offset;
76 static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
78 BUG_ON(!sys->private_data);
80 return sys->private_data;
83 int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val)
85 if ((uintptr_t)addr & (size - 1)) {
87 return PCIBIOS_BAD_REGISTER_NUMBER;
98 return PCIBIOS_BAD_REGISTER_NUMBER;
101 return PCIBIOS_SUCCESSFUL;
104 int dw_pcie_cfg_write(void __iomem *addr, int size, u32 val)
106 if ((uintptr_t)addr & (size - 1))
107 return PCIBIOS_BAD_REGISTER_NUMBER;
116 return PCIBIOS_BAD_REGISTER_NUMBER;
118 return PCIBIOS_SUCCESSFUL;
121 static inline void dw_pcie_readl_rc(struct pcie_port *pp, u32 reg, u32 *val)
123 if (pp->ops->readl_rc)
124 pp->ops->readl_rc(pp, pp->dbi_base + reg, val);
126 *val = readl(pp->dbi_base + reg);
129 static inline void dw_pcie_writel_rc(struct pcie_port *pp, u32 val, u32 reg)
131 if (pp->ops->writel_rc)
132 pp->ops->writel_rc(pp, val, pp->dbi_base + reg);
134 writel(val, pp->dbi_base + reg);
137 static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
142 if (pp->ops->rd_own_conf)
143 ret = pp->ops->rd_own_conf(pp, where, size, val);
145 ret = dw_pcie_cfg_read(pp->dbi_base + where, size, val);
150 static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
155 if (pp->ops->wr_own_conf)
156 ret = pp->ops->wr_own_conf(pp, where, size, val);
158 ret = dw_pcie_cfg_write(pp->dbi_base + where, size, val);
163 static void dw_pcie_prog_outbound_atu(struct pcie_port *pp, int index,
164 int type, u64 cpu_addr, u64 pci_addr, u32 size)
166 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | index,
168 dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr), PCIE_ATU_LOWER_BASE);
169 dw_pcie_writel_rc(pp, upper_32_bits(cpu_addr), PCIE_ATU_UPPER_BASE);
170 dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr + size - 1),
172 dw_pcie_writel_rc(pp, lower_32_bits(pci_addr), PCIE_ATU_LOWER_TARGET);
173 dw_pcie_writel_rc(pp, upper_32_bits(pci_addr), PCIE_ATU_UPPER_TARGET);
174 dw_pcie_writel_rc(pp, type, PCIE_ATU_CR1);
175 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
178 static struct irq_chip dw_msi_irq_chip = {
180 .irq_enable = pci_msi_unmask_irq,
181 .irq_disable = pci_msi_mask_irq,
182 .irq_mask = pci_msi_mask_irq,
183 .irq_unmask = pci_msi_unmask_irq,
186 /* MSI int handler */
187 irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
191 irqreturn_t ret = IRQ_NONE;
193 for (i = 0; i < MAX_MSI_CTRLS; i++) {
194 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
199 while ((pos = find_next_bit(&val, 32, pos)) != 32) {
200 irq = irq_find_mapping(pp->irq_domain,
202 dw_pcie_wr_own_conf(pp,
203 PCIE_MSI_INTR0_STATUS + i * 12,
205 generic_handle_irq(irq);
214 void dw_pcie_msi_init(struct pcie_port *pp)
218 pp->msi_data = __get_free_pages(GFP_KERNEL, 0);
219 msi_target = virt_to_phys((void *)pp->msi_data);
221 /* program the msi_data */
222 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
223 (u32)(msi_target & 0xffffffff));
224 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
225 (u32)(msi_target >> 32 & 0xffffffff));
228 static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
230 unsigned int res, bit, val;
232 res = (irq / 32) * 12;
234 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
236 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
239 static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
240 unsigned int nvec, unsigned int pos)
244 for (i = 0; i < nvec; i++) {
245 irq_set_msi_desc_off(irq_base, i, NULL);
246 /* Disable corresponding interrupt on MSI controller */
247 if (pp->ops->msi_clear_irq)
248 pp->ops->msi_clear_irq(pp, pos + i);
250 dw_pcie_msi_clear_irq(pp, pos + i);
253 bitmap_release_region(pp->msi_irq_in_use, pos, order_base_2(nvec));
256 static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
258 unsigned int res, bit, val;
260 res = (irq / 32) * 12;
262 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
264 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
267 static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
270 struct pcie_port *pp = sys_to_pcie(msi_desc_to_pci_sysdata(desc));
272 pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
273 order_base_2(no_irqs));
277 irq = irq_find_mapping(pp->irq_domain, pos0);
282 * irq_create_mapping (called from dw_pcie_host_init) pre-allocates
283 * descs so there is no need to allocate descs here. We can therefore
284 * assume that if irq_find_mapping above returns non-zero, then the
285 * descs are also successfully allocated.
288 for (i = 0; i < no_irqs; i++) {
289 if (irq_set_msi_desc_off(irq, i, desc) != 0) {
290 clear_irq_range(pp, irq, i, pos0);
293 /*Enable corresponding interrupt in MSI interrupt controller */
294 if (pp->ops->msi_set_irq)
295 pp->ops->msi_set_irq(pp, pos0 + i);
297 dw_pcie_msi_set_irq(pp, pos0 + i);
301 desc->nvec_used = no_irqs;
302 desc->msi_attrib.multiple = order_base_2(no_irqs);
311 static void dw_msi_setup_msg(struct pcie_port *pp, unsigned int irq, u32 pos)
316 if (pp->ops->get_msi_addr)
317 msi_target = pp->ops->get_msi_addr(pp);
319 msi_target = virt_to_phys((void *)pp->msi_data);
321 msg.address_lo = (u32)(msi_target & 0xffffffff);
322 msg.address_hi = (u32)(msi_target >> 32 & 0xffffffff);
324 if (pp->ops->get_msi_data)
325 msg.data = pp->ops->get_msi_data(pp, pos);
329 pci_write_msi_msg(irq, &msg);
332 static int dw_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
333 struct msi_desc *desc)
336 struct pcie_port *pp = sys_to_pcie(pdev->bus->sysdata);
338 if (desc->msi_attrib.is_msix)
341 irq = assign_irq(1, desc, &pos);
345 dw_msi_setup_msg(pp, irq, pos);
350 static int dw_msi_setup_irqs(struct msi_controller *chip, struct pci_dev *pdev,
353 #ifdef CONFIG_PCI_MSI
355 struct msi_desc *desc;
356 struct pcie_port *pp = sys_to_pcie(pdev->bus->sysdata);
358 /* MSI-X interrupts are not supported */
359 if (type == PCI_CAP_ID_MSIX)
362 WARN_ON(!list_is_singular(&pdev->dev.msi_list));
363 desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
365 irq = assign_irq(nvec, desc, &pos);
369 dw_msi_setup_msg(pp, irq, pos);
377 static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
379 struct irq_data *data = irq_get_irq_data(irq);
380 struct msi_desc *msi = irq_data_get_msi_desc(data);
381 struct pcie_port *pp = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
383 clear_irq_range(pp, irq, 1, data->hwirq);
386 static struct msi_controller dw_pcie_msi_chip = {
387 .setup_irq = dw_msi_setup_irq,
388 .setup_irqs = dw_msi_setup_irqs,
389 .teardown_irq = dw_msi_teardown_irq,
392 int dw_pcie_link_up(struct pcie_port *pp)
394 if (pp->ops->link_up)
395 return pp->ops->link_up(pp);
400 static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
401 irq_hw_number_t hwirq)
403 irq_set_chip_and_handler(irq, &dw_msi_irq_chip, handle_simple_irq);
404 irq_set_chip_data(irq, domain->host_data);
409 static const struct irq_domain_ops msi_domain_ops = {
410 .map = dw_pcie_msi_map,
413 int dw_pcie_host_init(struct pcie_port *pp)
415 struct device_node *np = pp->dev->of_node;
416 struct platform_device *pdev = to_platform_device(pp->dev);
417 struct of_pci_range range;
418 struct of_pci_range_parser parser;
419 struct resource *cfg_res;
424 /* Find the address cell size and the number of cells in order to get
425 * the untranslated address.
427 of_property_read_u32(np, "#address-cells", &na);
428 ns = of_n_size_cells(np);
430 cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
432 pp->cfg0_size = resource_size(cfg_res)/2;
433 pp->cfg1_size = resource_size(cfg_res)/2;
434 pp->cfg0_base = cfg_res->start;
435 pp->cfg1_base = cfg_res->start + pp->cfg0_size;
437 /* Find the untranslated configuration space address */
438 index = of_property_match_string(np, "reg-names", "config");
439 addrp = of_get_address(np, index, NULL, NULL);
440 pp->cfg0_mod_base = of_read_number(addrp, ns);
441 pp->cfg1_mod_base = pp->cfg0_mod_base + pp->cfg0_size;
442 } else if (!pp->va_cfg0_base) {
443 dev_err(pp->dev, "missing *config* reg space\n");
446 if (of_pci_range_parser_init(&parser, np)) {
447 dev_err(pp->dev, "missing ranges property\n");
451 /* Get the I/O and memory ranges from DT */
452 for_each_of_pci_range(&parser, &range) {
453 unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
455 if (restype == IORESOURCE_IO) {
456 of_pci_range_to_resource(&range, np, &pp->io);
458 pp->io.start = max_t(resource_size_t,
460 range.pci_addr + global_io_offset);
461 pp->io.end = min_t(resource_size_t,
463 range.pci_addr + range.size
464 + global_io_offset - 1);
465 pp->io_size = resource_size(&pp->io);
466 pp->io_bus_addr = range.pci_addr;
467 pp->io_base = range.cpu_addr;
469 /* Find the untranslated IO space address */
470 pp->io_mod_base = of_read_number(parser.range -
473 if (restype == IORESOURCE_MEM) {
474 of_pci_range_to_resource(&range, np, &pp->mem);
475 pp->mem.name = "MEM";
476 pp->mem_size = resource_size(&pp->mem);
477 pp->mem_bus_addr = range.pci_addr;
479 /* Find the untranslated MEM space address */
480 pp->mem_mod_base = of_read_number(parser.range -
484 of_pci_range_to_resource(&range, np, &pp->cfg);
485 pp->cfg0_size = resource_size(&pp->cfg)/2;
486 pp->cfg1_size = resource_size(&pp->cfg)/2;
487 pp->cfg0_base = pp->cfg.start;
488 pp->cfg1_base = pp->cfg.start + pp->cfg0_size;
490 /* Find the untranslated configuration space address */
491 pp->cfg0_mod_base = of_read_number(parser.range -
493 pp->cfg1_mod_base = pp->cfg0_mod_base +
498 ret = of_pci_parse_bus_range(np, &pp->busn);
500 pp->busn.name = np->name;
503 pp->busn.flags = IORESOURCE_BUS;
504 dev_dbg(pp->dev, "failed to parse bus-range property: %d, using default %pR\n",
509 pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
510 resource_size(&pp->cfg));
512 dev_err(pp->dev, "error with ioremap\n");
517 pp->mem_base = pp->mem.start;
519 if (!pp->va_cfg0_base) {
520 pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
522 if (!pp->va_cfg0_base) {
523 dev_err(pp->dev, "error with ioremap in function\n");
528 if (!pp->va_cfg1_base) {
529 pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
531 if (!pp->va_cfg1_base) {
532 dev_err(pp->dev, "error with ioremap\n");
537 if (of_property_read_u32(np, "num-lanes", &pp->lanes)) {
538 dev_err(pp->dev, "Failed to parse the number of lanes\n");
542 if (IS_ENABLED(CONFIG_PCI_MSI)) {
543 if (!pp->ops->msi_host_init) {
544 pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
545 MAX_MSI_IRQS, &msi_domain_ops,
547 if (!pp->irq_domain) {
548 dev_err(pp->dev, "irq domain init failed\n");
552 for (i = 0; i < MAX_MSI_IRQS; i++)
553 irq_create_mapping(pp->irq_domain, i);
555 ret = pp->ops->msi_host_init(pp, &dw_pcie_msi_chip);
561 if (pp->ops->host_init)
562 pp->ops->host_init(pp);
564 if (!pp->ops->rd_other_conf)
565 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
566 PCIE_ATU_TYPE_MEM, pp->mem_mod_base,
567 pp->mem_bus_addr, pp->mem_size);
569 dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
571 /* program correct class for RC */
572 dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
574 dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
575 val |= PORT_LOGIC_SPEED_CHANGE;
576 dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
578 #ifdef CONFIG_PCI_MSI
579 dw_pcie_msi_chip.dev = pp->dev;
582 dw_pci.nr_controllers = 1;
583 dw_pci.private_data = (void **)&pp;
585 pci_common_init_dev(pp->dev, &dw_pci);
590 static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
591 u32 devfn, int where, int size, u32 *val)
594 u32 busdev, cfg_size;
596 void __iomem *va_cfg_base;
598 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
599 PCIE_ATU_FUNC(PCI_FUNC(devfn));
601 if (bus->parent->number == pp->root_bus_nr) {
602 type = PCIE_ATU_TYPE_CFG0;
603 cpu_addr = pp->cfg0_mod_base;
604 cfg_size = pp->cfg0_size;
605 va_cfg_base = pp->va_cfg0_base;
607 type = PCIE_ATU_TYPE_CFG1;
608 cpu_addr = pp->cfg1_mod_base;
609 cfg_size = pp->cfg1_size;
610 va_cfg_base = pp->va_cfg1_base;
613 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
616 ret = dw_pcie_cfg_read(va_cfg_base + where, size, val);
617 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
618 PCIE_ATU_TYPE_IO, pp->io_mod_base,
619 pp->io_bus_addr, pp->io_size);
624 static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
625 u32 devfn, int where, int size, u32 val)
628 u32 busdev, cfg_size;
630 void __iomem *va_cfg_base;
632 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
633 PCIE_ATU_FUNC(PCI_FUNC(devfn));
635 if (bus->parent->number == pp->root_bus_nr) {
636 type = PCIE_ATU_TYPE_CFG0;
637 cpu_addr = pp->cfg0_mod_base;
638 cfg_size = pp->cfg0_size;
639 va_cfg_base = pp->va_cfg0_base;
641 type = PCIE_ATU_TYPE_CFG1;
642 cpu_addr = pp->cfg1_mod_base;
643 cfg_size = pp->cfg1_size;
644 va_cfg_base = pp->va_cfg1_base;
647 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
650 ret = dw_pcie_cfg_write(va_cfg_base + where, size, val);
651 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
652 PCIE_ATU_TYPE_IO, pp->io_mod_base,
653 pp->io_bus_addr, pp->io_size);
658 static int dw_pcie_valid_config(struct pcie_port *pp,
659 struct pci_bus *bus, int dev)
661 /* If there is no link, then there is no device */
662 if (bus->number != pp->root_bus_nr) {
663 if (!dw_pcie_link_up(pp))
667 /* access only one slot on each root port */
668 if (bus->number == pp->root_bus_nr && dev > 0)
672 * do not read more than one device on the bus directly attached
673 * to RC's (Virtual Bridge's) DS side.
675 if (bus->primary == pp->root_bus_nr && dev > 0)
681 static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
684 struct pcie_port *pp = sys_to_pcie(bus->sysdata);
687 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
689 return PCIBIOS_DEVICE_NOT_FOUND;
692 if (bus->number != pp->root_bus_nr)
693 if (pp->ops->rd_other_conf)
694 ret = pp->ops->rd_other_conf(pp, bus, devfn,
697 ret = dw_pcie_rd_other_conf(pp, bus, devfn,
700 ret = dw_pcie_rd_own_conf(pp, where, size, val);
705 static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
706 int where, int size, u32 val)
708 struct pcie_port *pp = sys_to_pcie(bus->sysdata);
711 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
712 return PCIBIOS_DEVICE_NOT_FOUND;
714 if (bus->number != pp->root_bus_nr)
715 if (pp->ops->wr_other_conf)
716 ret = pp->ops->wr_other_conf(pp, bus, devfn,
719 ret = dw_pcie_wr_other_conf(pp, bus, devfn,
722 ret = dw_pcie_wr_own_conf(pp, where, size, val);
727 static struct pci_ops dw_pcie_ops = {
728 .read = dw_pcie_rd_conf,
729 .write = dw_pcie_wr_conf,
732 static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
734 struct pcie_port *pp;
736 pp = sys_to_pcie(sys);
738 if (global_io_offset < SZ_1M && pp->io_size > 0) {
739 sys->io_offset = global_io_offset - pp->io_bus_addr;
740 pci_ioremap_io(global_io_offset, pp->io_base);
741 global_io_offset += SZ_64K;
742 pci_add_resource_offset(&sys->resources, &pp->io,
746 sys->mem_offset = pp->mem.start - pp->mem_bus_addr;
747 pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
748 pci_add_resource(&sys->resources, &pp->busn);
753 static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
756 struct pcie_port *pp = sys_to_pcie(sys);
758 pp->root_bus_nr = sys->busnr;
760 if (IS_ENABLED(CONFIG_PCI_MSI))
761 bus = pci_scan_root_bus_msi(pp->dev, sys->busnr, &dw_pcie_ops,
762 sys, &sys->resources,
765 bus = pci_scan_root_bus(pp->dev, sys->busnr, &dw_pcie_ops,
766 sys, &sys->resources);
771 if (bus && pp->ops->scan_bus)
772 pp->ops->scan_bus(pp);
777 static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
779 struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
782 irq = of_irq_parse_and_map_pci(dev, slot, pin);
789 static struct hw_pci dw_pci = {
790 .setup = dw_pcie_setup,
791 .scan = dw_pcie_scan_bus,
792 .map_irq = dw_pcie_map_irq,
795 void dw_pcie_setup_rc(struct pcie_port *pp)
801 /* set the number of lanes */
802 dw_pcie_readl_rc(pp, PCIE_PORT_LINK_CONTROL, &val);
803 val &= ~PORT_LINK_MODE_MASK;
806 val |= PORT_LINK_MODE_1_LANES;
809 val |= PORT_LINK_MODE_2_LANES;
812 val |= PORT_LINK_MODE_4_LANES;
815 val |= PORT_LINK_MODE_8_LANES;
818 dw_pcie_writel_rc(pp, val, PCIE_PORT_LINK_CONTROL);
820 /* set link width speed control register */
821 dw_pcie_readl_rc(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
822 val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
825 val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
828 val |= PORT_LOGIC_LINK_WIDTH_2_LANES;
831 val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
834 val |= PORT_LOGIC_LINK_WIDTH_8_LANES;
837 dw_pcie_writel_rc(pp, val, PCIE_LINK_WIDTH_SPEED_CONTROL);
840 dw_pcie_writel_rc(pp, 0x00000004, PCI_BASE_ADDRESS_0);
841 dw_pcie_writel_rc(pp, 0x00000000, PCI_BASE_ADDRESS_1);
843 /* setup interrupt pins */
844 dw_pcie_readl_rc(pp, PCI_INTERRUPT_LINE, &val);
847 dw_pcie_writel_rc(pp, val, PCI_INTERRUPT_LINE);
849 /* setup bus numbers */
850 dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS, &val);
853 dw_pcie_writel_rc(pp, val, PCI_PRIMARY_BUS);
855 /* setup memory base, memory limit */
856 membase = ((u32)pp->mem_base & 0xfff00000) >> 16;
857 memlimit = (pp->mem_size + (u32)pp->mem_base) & 0xfff00000;
858 val = memlimit | membase;
859 dw_pcie_writel_rc(pp, val, PCI_MEMORY_BASE);
861 /* setup command register */
862 dw_pcie_readl_rc(pp, PCI_COMMAND, &val);
864 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
865 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
866 dw_pcie_writel_rc(pp, val, PCI_COMMAND);
869 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
870 MODULE_DESCRIPTION("Designware PCIe host controller driver");
871 MODULE_LICENSE("GPL v2");