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 where, int size, u32 *val)
88 *val = (*val >> (8 * (where & 3))) & 0xff;
90 *val = (*val >> (8 * (where & 3))) & 0xffff;
92 return PCIBIOS_BAD_REGISTER_NUMBER;
94 return PCIBIOS_SUCCESSFUL;
97 int dw_pcie_cfg_write(void __iomem *addr, int where, int size, u32 val)
102 writew(val, addr + (where & 2));
104 writeb(val, addr + (where & 3));
106 return PCIBIOS_BAD_REGISTER_NUMBER;
108 return PCIBIOS_SUCCESSFUL;
111 static inline void dw_pcie_readl_rc(struct pcie_port *pp, u32 reg, u32 *val)
113 if (pp->ops->readl_rc)
114 pp->ops->readl_rc(pp, pp->dbi_base + reg, val);
116 *val = readl(pp->dbi_base + reg);
119 static inline void dw_pcie_writel_rc(struct pcie_port *pp, u32 val, u32 reg)
121 if (pp->ops->writel_rc)
122 pp->ops->writel_rc(pp, val, pp->dbi_base + reg);
124 writel(val, pp->dbi_base + reg);
127 static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
132 if (pp->ops->rd_own_conf)
133 ret = pp->ops->rd_own_conf(pp, where, size, val);
135 ret = dw_pcie_cfg_read(pp->dbi_base + (where & ~0x3), where,
141 static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
146 if (pp->ops->wr_own_conf)
147 ret = pp->ops->wr_own_conf(pp, where, size, val);
149 ret = dw_pcie_cfg_write(pp->dbi_base + (where & ~0x3), where,
155 static void dw_pcie_prog_outbound_atu(struct pcie_port *pp, int index,
156 int type, u64 cpu_addr, u64 pci_addr, u32 size)
158 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | index,
160 dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr), PCIE_ATU_LOWER_BASE);
161 dw_pcie_writel_rc(pp, upper_32_bits(cpu_addr), PCIE_ATU_UPPER_BASE);
162 dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr + size - 1),
164 dw_pcie_writel_rc(pp, lower_32_bits(pci_addr), PCIE_ATU_LOWER_TARGET);
165 dw_pcie_writel_rc(pp, upper_32_bits(pci_addr), PCIE_ATU_UPPER_TARGET);
166 dw_pcie_writel_rc(pp, type, PCIE_ATU_CR1);
167 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
170 static struct irq_chip dw_msi_irq_chip = {
172 .irq_enable = pci_msi_unmask_irq,
173 .irq_disable = pci_msi_mask_irq,
174 .irq_mask = pci_msi_mask_irq,
175 .irq_unmask = pci_msi_unmask_irq,
178 /* MSI int handler */
179 irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
183 irqreturn_t ret = IRQ_NONE;
185 for (i = 0; i < MAX_MSI_CTRLS; i++) {
186 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
191 while ((pos = find_next_bit(&val, 32, pos)) != 32) {
192 irq = irq_find_mapping(pp->irq_domain,
194 dw_pcie_wr_own_conf(pp,
195 PCIE_MSI_INTR0_STATUS + i * 12,
197 generic_handle_irq(irq);
206 void dw_pcie_msi_init(struct pcie_port *pp)
210 pp->msi_data = __get_free_pages(GFP_KERNEL, 0);
211 msi_target = virt_to_phys((void *)pp->msi_data);
213 /* program the msi_data */
214 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
215 (u32)(msi_target & 0xffffffff));
216 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
217 (u32)(msi_target >> 32 & 0xffffffff));
220 static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
222 unsigned int res, bit, val;
224 res = (irq / 32) * 12;
226 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
228 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
231 static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
232 unsigned int nvec, unsigned int pos)
236 for (i = 0; i < nvec; i++) {
237 irq_set_msi_desc_off(irq_base, i, NULL);
238 /* Disable corresponding interrupt on MSI controller */
239 if (pp->ops->msi_clear_irq)
240 pp->ops->msi_clear_irq(pp, pos + i);
242 dw_pcie_msi_clear_irq(pp, pos + i);
245 bitmap_release_region(pp->msi_irq_in_use, pos, order_base_2(nvec));
248 static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
250 unsigned int res, bit, val;
252 res = (irq / 32) * 12;
254 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
256 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
259 static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
262 struct pcie_port *pp = sys_to_pcie(msi_desc_to_pci_sysdata(desc));
264 pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
265 order_base_2(no_irqs));
269 irq = irq_find_mapping(pp->irq_domain, pos0);
274 * irq_create_mapping (called from dw_pcie_host_init) pre-allocates
275 * descs so there is no need to allocate descs here. We can therefore
276 * assume that if irq_find_mapping above returns non-zero, then the
277 * descs are also successfully allocated.
280 for (i = 0; i < no_irqs; i++) {
281 if (irq_set_msi_desc_off(irq, i, desc) != 0) {
282 clear_irq_range(pp, irq, i, pos0);
285 /*Enable corresponding interrupt in MSI interrupt controller */
286 if (pp->ops->msi_set_irq)
287 pp->ops->msi_set_irq(pp, pos0 + i);
289 dw_pcie_msi_set_irq(pp, pos0 + i);
293 desc->nvec_used = no_irqs;
294 desc->msi_attrib.multiple = order_base_2(no_irqs);
303 static void dw_msi_setup_msg(struct pcie_port *pp, unsigned int irq, u32 pos)
308 if (pp->ops->get_msi_addr)
309 msi_target = pp->ops->get_msi_addr(pp);
311 msi_target = virt_to_phys((void *)pp->msi_data);
313 msg.address_lo = (u32)(msi_target & 0xffffffff);
314 msg.address_hi = (u32)(msi_target >> 32 & 0xffffffff);
316 if (pp->ops->get_msi_data)
317 msg.data = pp->ops->get_msi_data(pp, pos);
321 pci_write_msi_msg(irq, &msg);
324 static int dw_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
325 struct msi_desc *desc)
328 struct pcie_port *pp = sys_to_pcie(pdev->bus->sysdata);
330 if (desc->msi_attrib.is_msix)
333 irq = assign_irq(1, desc, &pos);
337 dw_msi_setup_msg(pp, irq, pos);
342 static int dw_msi_setup_irqs(struct msi_controller *chip, struct pci_dev *pdev,
345 #ifdef CONFIG_PCI_MSI
347 struct msi_desc *desc;
348 struct pcie_port *pp = sys_to_pcie(pdev->bus->sysdata);
350 /* MSI-X interrupts are not supported */
351 if (type == PCI_CAP_ID_MSIX)
354 WARN_ON(!list_is_singular(&pdev->dev.msi_list));
355 desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
357 irq = assign_irq(nvec, desc, &pos);
361 dw_msi_setup_msg(pp, irq, pos);
369 static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
371 struct irq_data *data = irq_get_irq_data(irq);
372 struct msi_desc *msi = irq_data_get_msi_desc(data);
373 struct pcie_port *pp = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
375 clear_irq_range(pp, irq, 1, data->hwirq);
378 static struct msi_controller dw_pcie_msi_chip = {
379 .setup_irq = dw_msi_setup_irq,
380 .setup_irqs = dw_msi_setup_irqs,
381 .teardown_irq = dw_msi_teardown_irq,
384 int dw_pcie_link_up(struct pcie_port *pp)
386 if (pp->ops->link_up)
387 return pp->ops->link_up(pp);
392 static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
393 irq_hw_number_t hwirq)
395 irq_set_chip_and_handler(irq, &dw_msi_irq_chip, handle_simple_irq);
396 irq_set_chip_data(irq, domain->host_data);
401 static const struct irq_domain_ops msi_domain_ops = {
402 .map = dw_pcie_msi_map,
405 int dw_pcie_host_init(struct pcie_port *pp)
407 struct device_node *np = pp->dev->of_node;
408 struct platform_device *pdev = to_platform_device(pp->dev);
409 struct of_pci_range range;
410 struct of_pci_range_parser parser;
411 struct resource *cfg_res;
416 /* Find the address cell size and the number of cells in order to get
417 * the untranslated address.
419 of_property_read_u32(np, "#address-cells", &na);
420 ns = of_n_size_cells(np);
422 cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
424 pp->cfg0_size = resource_size(cfg_res)/2;
425 pp->cfg1_size = resource_size(cfg_res)/2;
426 pp->cfg0_base = cfg_res->start;
427 pp->cfg1_base = cfg_res->start + pp->cfg0_size;
429 /* Find the untranslated configuration space address */
430 index = of_property_match_string(np, "reg-names", "config");
431 addrp = of_get_address(np, index, NULL, NULL);
432 pp->cfg0_mod_base = of_read_number(addrp, ns);
433 pp->cfg1_mod_base = pp->cfg0_mod_base + pp->cfg0_size;
434 } else if (!pp->va_cfg0_base) {
435 dev_err(pp->dev, "missing *config* reg space\n");
438 if (of_pci_range_parser_init(&parser, np)) {
439 dev_err(pp->dev, "missing ranges property\n");
443 /* Get the I/O and memory ranges from DT */
444 for_each_of_pci_range(&parser, &range) {
445 unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
447 if (restype == IORESOURCE_IO) {
448 of_pci_range_to_resource(&range, np, &pp->io);
450 pp->io.start = max_t(resource_size_t,
452 range.pci_addr + global_io_offset);
453 pp->io.end = min_t(resource_size_t,
455 range.pci_addr + range.size
456 + global_io_offset - 1);
457 pp->io_size = resource_size(&pp->io);
458 pp->io_bus_addr = range.pci_addr;
459 pp->io_base = range.cpu_addr;
461 /* Find the untranslated IO space address */
462 pp->io_mod_base = of_read_number(parser.range -
465 if (restype == IORESOURCE_MEM) {
466 of_pci_range_to_resource(&range, np, &pp->mem);
467 pp->mem.name = "MEM";
468 pp->mem_size = resource_size(&pp->mem);
469 pp->mem_bus_addr = range.pci_addr;
471 /* Find the untranslated MEM space address */
472 pp->mem_mod_base = of_read_number(parser.range -
476 of_pci_range_to_resource(&range, np, &pp->cfg);
477 pp->cfg0_size = resource_size(&pp->cfg)/2;
478 pp->cfg1_size = resource_size(&pp->cfg)/2;
479 pp->cfg0_base = pp->cfg.start;
480 pp->cfg1_base = pp->cfg.start + pp->cfg0_size;
482 /* Find the untranslated configuration space address */
483 pp->cfg0_mod_base = of_read_number(parser.range -
485 pp->cfg1_mod_base = pp->cfg0_mod_base +
490 ret = of_pci_parse_bus_range(np, &pp->busn);
492 pp->busn.name = np->name;
495 pp->busn.flags = IORESOURCE_BUS;
496 dev_dbg(pp->dev, "failed to parse bus-range property: %d, using default %pR\n",
501 pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
502 resource_size(&pp->cfg));
504 dev_err(pp->dev, "error with ioremap\n");
509 pp->mem_base = pp->mem.start;
511 if (!pp->va_cfg0_base) {
512 pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
514 if (!pp->va_cfg0_base) {
515 dev_err(pp->dev, "error with ioremap in function\n");
520 if (!pp->va_cfg1_base) {
521 pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
523 if (!pp->va_cfg1_base) {
524 dev_err(pp->dev, "error with ioremap\n");
529 if (of_property_read_u32(np, "num-lanes", &pp->lanes)) {
530 dev_err(pp->dev, "Failed to parse the number of lanes\n");
534 if (IS_ENABLED(CONFIG_PCI_MSI)) {
535 if (!pp->ops->msi_host_init) {
536 pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
537 MAX_MSI_IRQS, &msi_domain_ops,
539 if (!pp->irq_domain) {
540 dev_err(pp->dev, "irq domain init failed\n");
544 for (i = 0; i < MAX_MSI_IRQS; i++)
545 irq_create_mapping(pp->irq_domain, i);
547 ret = pp->ops->msi_host_init(pp, &dw_pcie_msi_chip);
553 if (pp->ops->host_init)
554 pp->ops->host_init(pp);
556 if (!pp->ops->rd_other_conf)
557 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
558 PCIE_ATU_TYPE_MEM, pp->mem_mod_base,
559 pp->mem_bus_addr, pp->mem_size);
561 dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
563 /* program correct class for RC */
564 dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
566 dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
567 val |= PORT_LOGIC_SPEED_CHANGE;
568 dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
570 #ifdef CONFIG_PCI_MSI
571 dw_pcie_msi_chip.dev = pp->dev;
574 dw_pci.nr_controllers = 1;
575 dw_pci.private_data = (void **)&pp;
577 pci_common_init_dev(pp->dev, &dw_pci);
582 static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
583 u32 devfn, int where, int size, u32 *val)
586 u32 address, busdev, cfg_size;
588 void __iomem *va_cfg_base;
590 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
591 PCIE_ATU_FUNC(PCI_FUNC(devfn));
592 address = where & ~0x3;
594 if (bus->parent->number == pp->root_bus_nr) {
595 type = PCIE_ATU_TYPE_CFG0;
596 cpu_addr = pp->cfg0_mod_base;
597 cfg_size = pp->cfg0_size;
598 va_cfg_base = pp->va_cfg0_base;
600 type = PCIE_ATU_TYPE_CFG1;
601 cpu_addr = pp->cfg1_mod_base;
602 cfg_size = pp->cfg1_size;
603 va_cfg_base = pp->va_cfg1_base;
606 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
609 ret = dw_pcie_cfg_read(va_cfg_base + address, where, size, val);
610 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
611 PCIE_ATU_TYPE_IO, pp->io_mod_base,
612 pp->io_bus_addr, pp->io_size);
617 static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
618 u32 devfn, int where, int size, u32 val)
621 u32 address, busdev, cfg_size;
623 void __iomem *va_cfg_base;
625 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
626 PCIE_ATU_FUNC(PCI_FUNC(devfn));
627 address = where & ~0x3;
629 if (bus->parent->number == pp->root_bus_nr) {
630 type = PCIE_ATU_TYPE_CFG0;
631 cpu_addr = pp->cfg0_mod_base;
632 cfg_size = pp->cfg0_size;
633 va_cfg_base = pp->va_cfg0_base;
635 type = PCIE_ATU_TYPE_CFG1;
636 cpu_addr = pp->cfg1_mod_base;
637 cfg_size = pp->cfg1_size;
638 va_cfg_base = pp->va_cfg1_base;
641 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
644 ret = dw_pcie_cfg_write(va_cfg_base + address, where, size, val);
645 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
646 PCIE_ATU_TYPE_IO, pp->io_mod_base,
647 pp->io_bus_addr, pp->io_size);
652 static int dw_pcie_valid_config(struct pcie_port *pp,
653 struct pci_bus *bus, int dev)
655 /* If there is no link, then there is no device */
656 if (bus->number != pp->root_bus_nr) {
657 if (!dw_pcie_link_up(pp))
661 /* access only one slot on each root port */
662 if (bus->number == pp->root_bus_nr && dev > 0)
666 * do not read more than one device on the bus directly attached
667 * to RC's (Virtual Bridge's) DS side.
669 if (bus->primary == pp->root_bus_nr && dev > 0)
675 static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
678 struct pcie_port *pp = sys_to_pcie(bus->sysdata);
681 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
683 return PCIBIOS_DEVICE_NOT_FOUND;
686 if (bus->number != pp->root_bus_nr)
687 if (pp->ops->rd_other_conf)
688 ret = pp->ops->rd_other_conf(pp, bus, devfn,
691 ret = dw_pcie_rd_other_conf(pp, bus, devfn,
694 ret = dw_pcie_rd_own_conf(pp, where, size, val);
699 static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
700 int where, int size, u32 val)
702 struct pcie_port *pp = sys_to_pcie(bus->sysdata);
705 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
706 return PCIBIOS_DEVICE_NOT_FOUND;
708 if (bus->number != pp->root_bus_nr)
709 if (pp->ops->wr_other_conf)
710 ret = pp->ops->wr_other_conf(pp, bus, devfn,
713 ret = dw_pcie_wr_other_conf(pp, bus, devfn,
716 ret = dw_pcie_wr_own_conf(pp, where, size, val);
721 static struct pci_ops dw_pcie_ops = {
722 .read = dw_pcie_rd_conf,
723 .write = dw_pcie_wr_conf,
726 static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
728 struct pcie_port *pp;
730 pp = sys_to_pcie(sys);
732 if (global_io_offset < SZ_1M && pp->io_size > 0) {
733 sys->io_offset = global_io_offset - pp->io_bus_addr;
734 pci_ioremap_io(global_io_offset, pp->io_base);
735 global_io_offset += SZ_64K;
736 pci_add_resource_offset(&sys->resources, &pp->io,
740 sys->mem_offset = pp->mem.start - pp->mem_bus_addr;
741 pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
742 pci_add_resource(&sys->resources, &pp->busn);
747 static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
750 struct pcie_port *pp = sys_to_pcie(sys);
752 pp->root_bus_nr = sys->busnr;
754 if (IS_ENABLED(CONFIG_PCI_MSI))
755 bus = pci_scan_root_bus_msi(pp->dev, sys->busnr, &dw_pcie_ops,
756 sys, &sys->resources,
759 bus = pci_scan_root_bus(pp->dev, sys->busnr, &dw_pcie_ops,
760 sys, &sys->resources);
765 if (bus && pp->ops->scan_bus)
766 pp->ops->scan_bus(pp);
771 static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
773 struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
776 irq = of_irq_parse_and_map_pci(dev, slot, pin);
783 static struct hw_pci dw_pci = {
784 .setup = dw_pcie_setup,
785 .scan = dw_pcie_scan_bus,
786 .map_irq = dw_pcie_map_irq,
789 void dw_pcie_setup_rc(struct pcie_port *pp)
795 /* set the number of lanes */
796 dw_pcie_readl_rc(pp, PCIE_PORT_LINK_CONTROL, &val);
797 val &= ~PORT_LINK_MODE_MASK;
800 val |= PORT_LINK_MODE_1_LANES;
803 val |= PORT_LINK_MODE_2_LANES;
806 val |= PORT_LINK_MODE_4_LANES;
809 val |= PORT_LINK_MODE_8_LANES;
812 dw_pcie_writel_rc(pp, val, PCIE_PORT_LINK_CONTROL);
814 /* set link width speed control register */
815 dw_pcie_readl_rc(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
816 val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
819 val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
822 val |= PORT_LOGIC_LINK_WIDTH_2_LANES;
825 val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
828 val |= PORT_LOGIC_LINK_WIDTH_8_LANES;
831 dw_pcie_writel_rc(pp, val, PCIE_LINK_WIDTH_SPEED_CONTROL);
834 dw_pcie_writel_rc(pp, 0x00000004, PCI_BASE_ADDRESS_0);
835 dw_pcie_writel_rc(pp, 0x00000000, PCI_BASE_ADDRESS_1);
837 /* setup interrupt pins */
838 dw_pcie_readl_rc(pp, PCI_INTERRUPT_LINE, &val);
841 dw_pcie_writel_rc(pp, val, PCI_INTERRUPT_LINE);
843 /* setup bus numbers */
844 dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS, &val);
847 dw_pcie_writel_rc(pp, val, PCI_PRIMARY_BUS);
849 /* setup memory base, memory limit */
850 membase = ((u32)pp->mem_base & 0xfff00000) >> 16;
851 memlimit = (pp->mem_size + (u32)pp->mem_base) & 0xfff00000;
852 val = memlimit | membase;
853 dw_pcie_writel_rc(pp, val, PCI_MEMORY_BASE);
855 /* setup command register */
856 dw_pcie_readl_rc(pp, PCI_COMMAND, &val);
858 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
859 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
860 dw_pcie_writel_rc(pp, val, PCI_COMMAND);
863 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
864 MODULE_DESCRIPTION("Designware PCIe host controller driver");
865 MODULE_LICENSE("GPL v2");