1 // SPDX-License-Identifier: GPL-2.0
3 * PCIe host controller driver for Texas Instruments Keystone SoCs
5 * Copyright (C) 2013-2014 Texas Instruments., Ltd.
9 * Implementation based on pci-exynos.c and pcie-designware.c
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/irqchip/chained_irq.h>
18 #include <linux/irqdomain.h>
19 #include <linux/mfd/syscon.h>
20 #include <linux/msi.h>
22 #include <linux/of_device.h>
23 #include <linux/of_irq.h>
24 #include <linux/of_pci.h>
25 #include <linux/phy/phy.h>
26 #include <linux/platform_device.h>
27 #include <linux/regmap.h>
28 #include <linux/resource.h>
29 #include <linux/signal.h>
31 #include "../../pci.h"
32 #include "pcie-designware.h"
34 #define PCIE_VENDORID_MASK 0xffff
35 #define PCIE_DEVICEID_SHIFT 16
37 /* Application registers */
38 #define CMD_STATUS 0x004
39 #define LTSSM_EN_VAL BIT(0)
40 #define OB_XLAT_EN_VAL BIT(1)
41 #define DBI_CS2 BIT(5)
43 #define CFG_SETUP 0x008
44 #define CFG_BUS(x) (((x) & 0xff) << 16)
45 #define CFG_DEVICE(x) (((x) & 0x1f) << 8)
46 #define CFG_FUNC(x) ((x) & 0x7)
47 #define CFG_TYPE1 BIT(24)
50 #define OB_OFFSET_INDEX(n) (0x200 + (8 * (n)))
51 #define OB_OFFSET_HI(n) (0x204 + (8 * (n)))
52 #define OB_ENABLEN BIT(0)
53 #define OB_WIN_SIZE 8 /* 8MB */
55 #define PCIE_LEGACY_IRQ_ENABLE_SET(n) (0x188 + (0x10 * ((n) - 1)))
56 #define PCIE_LEGACY_IRQ_ENABLE_CLR(n) (0x18c + (0x10 * ((n) - 1)))
57 #define PCIE_EP_IRQ_SET 0x64
58 #define PCIE_EP_IRQ_CLR 0x68
59 #define INT_ENABLE BIT(0)
61 /* IRQ register defines */
65 #define MSI_IRQ_STATUS(n) (0x104 + ((n) << 4))
66 #define MSI_IRQ_ENABLE_SET(n) (0x108 + ((n) << 4))
67 #define MSI_IRQ_ENABLE_CLR(n) (0x10c + ((n) << 4))
68 #define MSI_IRQ_OFFSET 4
70 #define IRQ_STATUS(n) (0x184 + ((n) << 4))
71 #define IRQ_ENABLE_SET(n) (0x188 + ((n) << 4))
72 #define INTx_EN BIT(0)
74 #define ERR_IRQ_STATUS 0x1c4
75 #define ERR_IRQ_ENABLE_SET 0x1c8
76 #define ERR_AER BIT(5) /* ECRC error */
77 #define AM6_ERR_AER BIT(4) /* AM6 ECRC error */
78 #define ERR_AXI BIT(4) /* AXI tag lookup fatal error */
79 #define ERR_CORR BIT(3) /* Correctable error */
80 #define ERR_NONFATAL BIT(2) /* Non-fatal error */
81 #define ERR_FATAL BIT(1) /* Fatal error */
82 #define ERR_SYS BIT(0) /* System error */
83 #define ERR_IRQ_ALL (ERR_AER | ERR_AXI | ERR_CORR | \
84 ERR_NONFATAL | ERR_FATAL | ERR_SYS)
86 /* PCIE controller device IDs */
87 #define PCIE_RC_K2HK 0xb008
88 #define PCIE_RC_K2E 0xb009
89 #define PCIE_RC_K2L 0xb00a
90 #define PCIE_RC_K2G 0xb00b
92 #define KS_PCIE_DEV_TYPE_MASK (0x3 << 1)
93 #define KS_PCIE_DEV_TYPE(mode) ((mode) << 1)
99 #define KS_PCIE_SYSCLOCKOUTEN BIT(0)
101 #define AM654_PCIE_DEV_TYPE_MASK 0x3
102 #define AM654_WIN_SIZE SZ_64K
104 #define APP_ADDR_SPACE_0 (16 * SZ_1K)
106 #define to_keystone_pcie(x) dev_get_drvdata((x)->dev)
108 struct ks_pcie_of_data {
109 enum dw_pcie_device_mode mode;
110 const struct dw_pcie_host_ops *host_ops;
111 const struct dw_pcie_ep_ops *ep_ops;
112 unsigned int version;
115 struct keystone_pcie {
119 int legacy_host_irqs[PCI_NUM_INTX];
120 struct device_node *legacy_intc_np;
125 struct device_link **link;
126 struct device_node *msi_intc_np;
127 struct irq_domain *legacy_irq_domain;
128 struct device_node *np;
130 /* Application register space */
131 void __iomem *va_app_base; /* DT 1st resource */
136 static u32 ks_pcie_app_readl(struct keystone_pcie *ks_pcie, u32 offset)
138 return readl(ks_pcie->va_app_base + offset);
141 static void ks_pcie_app_writel(struct keystone_pcie *ks_pcie, u32 offset,
144 writel(val, ks_pcie->va_app_base + offset);
147 static void ks_pcie_msi_irq_ack(struct irq_data *data)
149 struct pcie_port *pp = irq_data_get_irq_chip_data(data);
150 struct keystone_pcie *ks_pcie;
151 u32 irq = data->hwirq;
156 pci = to_dw_pcie_from_pp(pp);
157 ks_pcie = to_keystone_pcie(pci);
159 reg_offset = irq % 8;
162 ks_pcie_app_writel(ks_pcie, MSI_IRQ_STATUS(reg_offset),
164 ks_pcie_app_writel(ks_pcie, IRQ_EOI, reg_offset + MSI_IRQ_OFFSET);
167 static void ks_pcie_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
169 struct pcie_port *pp = irq_data_get_irq_chip_data(data);
170 struct keystone_pcie *ks_pcie;
174 pci = to_dw_pcie_from_pp(pp);
175 ks_pcie = to_keystone_pcie(pci);
177 msi_target = ks_pcie->app.start + MSI_IRQ;
178 msg->address_lo = lower_32_bits(msi_target);
179 msg->address_hi = upper_32_bits(msi_target);
180 msg->data = data->hwirq;
182 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
183 (int)data->hwirq, msg->address_hi, msg->address_lo);
186 static int ks_pcie_msi_set_affinity(struct irq_data *irq_data,
187 const struct cpumask *mask, bool force)
192 static void ks_pcie_msi_mask(struct irq_data *data)
194 struct pcie_port *pp = irq_data_get_irq_chip_data(data);
195 struct keystone_pcie *ks_pcie;
196 u32 irq = data->hwirq;
202 raw_spin_lock_irqsave(&pp->lock, flags);
204 pci = to_dw_pcie_from_pp(pp);
205 ks_pcie = to_keystone_pcie(pci);
207 reg_offset = irq % 8;
210 ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_CLR(reg_offset),
213 raw_spin_unlock_irqrestore(&pp->lock, flags);
216 static void ks_pcie_msi_unmask(struct irq_data *data)
218 struct pcie_port *pp = irq_data_get_irq_chip_data(data);
219 struct keystone_pcie *ks_pcie;
220 u32 irq = data->hwirq;
226 raw_spin_lock_irqsave(&pp->lock, flags);
228 pci = to_dw_pcie_from_pp(pp);
229 ks_pcie = to_keystone_pcie(pci);
231 reg_offset = irq % 8;
234 ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_SET(reg_offset),
237 raw_spin_unlock_irqrestore(&pp->lock, flags);
240 static struct irq_chip ks_pcie_msi_irq_chip = {
241 .name = "KEYSTONE-PCI-MSI",
242 .irq_ack = ks_pcie_msi_irq_ack,
243 .irq_compose_msi_msg = ks_pcie_compose_msi_msg,
244 .irq_set_affinity = ks_pcie_msi_set_affinity,
245 .irq_mask = ks_pcie_msi_mask,
246 .irq_unmask = ks_pcie_msi_unmask,
249 static int ks_pcie_msi_host_init(struct pcie_port *pp)
251 pp->msi_irq_chip = &ks_pcie_msi_irq_chip;
252 return dw_pcie_allocate_domains(pp);
255 static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie,
258 struct dw_pcie *pci = ks_pcie->pci;
259 struct device *dev = pci->dev;
263 pending = ks_pcie_app_readl(ks_pcie, IRQ_STATUS(offset));
265 if (BIT(0) & pending) {
266 virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
267 dev_dbg(dev, ": irq: irq_offset %d, virq %d\n", offset, virq);
268 generic_handle_irq(virq);
271 /* EOI the INTx interrupt */
272 ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset);
276 * Dummy function so that DW core doesn't configure MSI
278 static int ks_pcie_am654_msi_host_init(struct pcie_port *pp)
283 static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
285 ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
288 static irqreturn_t ks_pcie_handle_error_irq(struct keystone_pcie *ks_pcie)
291 struct device *dev = ks_pcie->pci->dev;
293 reg = ks_pcie_app_readl(ks_pcie, ERR_IRQ_STATUS);
298 dev_err(dev, "System Error\n");
301 dev_err(dev, "Fatal Error\n");
303 if (reg & ERR_NONFATAL)
304 dev_dbg(dev, "Non Fatal Error\n");
307 dev_dbg(dev, "Correctable Error\n");
309 if (!ks_pcie->is_am6 && (reg & ERR_AXI))
310 dev_err(dev, "AXI tag lookup fatal Error\n");
312 if (reg & ERR_AER || (ks_pcie->is_am6 && (reg & AM6_ERR_AER)))
313 dev_err(dev, "ECRC Error\n");
315 ks_pcie_app_writel(ks_pcie, ERR_IRQ_STATUS, reg);
320 static void ks_pcie_ack_legacy_irq(struct irq_data *d)
324 static void ks_pcie_mask_legacy_irq(struct irq_data *d)
328 static void ks_pcie_unmask_legacy_irq(struct irq_data *d)
332 static struct irq_chip ks_pcie_legacy_irq_chip = {
333 .name = "Keystone-PCI-Legacy-IRQ",
334 .irq_ack = ks_pcie_ack_legacy_irq,
335 .irq_mask = ks_pcie_mask_legacy_irq,
336 .irq_unmask = ks_pcie_unmask_legacy_irq,
339 static int ks_pcie_init_legacy_irq_map(struct irq_domain *d,
341 irq_hw_number_t hw_irq)
343 irq_set_chip_and_handler(irq, &ks_pcie_legacy_irq_chip,
345 irq_set_chip_data(irq, d->host_data);
350 static const struct irq_domain_ops ks_pcie_legacy_irq_domain_ops = {
351 .map = ks_pcie_init_legacy_irq_map,
352 .xlate = irq_domain_xlate_onetwocell,
356 * ks_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask
359 * Since modification of dbi_cs2 involves different clock domain, read the
360 * status back to ensure the transition is complete.
362 static void ks_pcie_set_dbi_mode(struct keystone_pcie *ks_pcie)
366 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
368 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
371 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
372 } while (!(val & DBI_CS2));
376 * ks_pcie_clear_dbi_mode() - Disable DBI mode
378 * Since modification of dbi_cs2 involves different clock domain, read the
379 * status back to ensure the transition is complete.
381 static void ks_pcie_clear_dbi_mode(struct keystone_pcie *ks_pcie)
385 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
387 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
390 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
391 } while (val & DBI_CS2);
394 static void ks_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
397 struct dw_pcie *pci = ks_pcie->pci;
398 struct pcie_port *pp = &pci->pp;
399 u32 num_viewport = pci->num_viewport;
401 struct resource *mem;
404 mem = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM)->res;
408 /* Disable BARs for inbound access */
409 ks_pcie_set_dbi_mode(ks_pcie);
410 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
411 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0);
412 ks_pcie_clear_dbi_mode(ks_pcie);
417 val = ilog2(OB_WIN_SIZE);
418 ks_pcie_app_writel(ks_pcie, OB_SIZE, val);
420 /* Using Direct 1:1 mapping of RC <-> PCI memory space */
421 for (i = 0; i < num_viewport && (start < end); i++) {
422 ks_pcie_app_writel(ks_pcie, OB_OFFSET_INDEX(i),
423 lower_32_bits(start) | OB_ENABLEN);
424 ks_pcie_app_writel(ks_pcie, OB_OFFSET_HI(i),
425 upper_32_bits(start));
426 start += OB_WIN_SIZE * SZ_1M;
429 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
430 val |= OB_XLAT_EN_VAL;
431 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
434 static void __iomem *ks_pcie_other_map_bus(struct pci_bus *bus,
435 unsigned int devfn, int where)
437 struct pcie_port *pp = bus->sysdata;
438 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
439 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
442 reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
443 CFG_FUNC(PCI_FUNC(devfn));
444 if (!pci_is_root_bus(bus->parent))
446 ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg);
448 return pp->va_cfg0_base + where;
451 static struct pci_ops ks_child_pcie_ops = {
452 .map_bus = ks_pcie_other_map_bus,
453 .read = pci_generic_config_read,
454 .write = pci_generic_config_write,
458 * ks_pcie_v3_65_add_bus() - keystone add_bus post initialization
460 * This sets BAR0 to enable inbound access for MSI_IRQ register
462 static int ks_pcie_v3_65_add_bus(struct pci_bus *bus)
464 struct pcie_port *pp = bus->sysdata;
465 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
466 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
468 if (!pci_is_root_bus(bus))
471 /* Configure and set up BAR0 */
472 ks_pcie_set_dbi_mode(ks_pcie);
475 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 1);
476 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, SZ_4K - 1);
478 ks_pcie_clear_dbi_mode(ks_pcie);
481 * For BAR0, just setting bus address for inbound writes (MSI) should
482 * be sufficient. Use physical address to avoid any conflicts.
484 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, ks_pcie->app.start);
489 static struct pci_ops ks_pcie_ops = {
490 .map_bus = dw_pcie_own_conf_map_bus,
491 .read = pci_generic_config_read,
492 .write = pci_generic_config_write,
493 .add_bus = ks_pcie_v3_65_add_bus,
497 * ks_pcie_link_up() - Check if link up
499 static int ks_pcie_link_up(struct dw_pcie *pci)
503 val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0);
504 val &= PORT_LOGIC_LTSSM_STATE_MASK;
505 return (val == PORT_LOGIC_LTSSM_STATE_L0);
508 static void ks_pcie_stop_link(struct dw_pcie *pci)
510 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
513 /* Disable Link training */
514 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
515 val &= ~LTSSM_EN_VAL;
516 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
519 static int ks_pcie_start_link(struct dw_pcie *pci)
521 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
522 struct device *dev = pci->dev;
525 if (dw_pcie_link_up(pci)) {
526 dev_dbg(dev, "link is already up\n");
530 /* Initiate Link Training */
531 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
532 ks_pcie_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
537 static void ks_pcie_quirk(struct pci_dev *dev)
539 struct pci_bus *bus = dev->bus;
540 struct pci_dev *bridge;
541 static const struct pci_device_id rc_pci_devids[] = {
542 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2HK),
543 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
544 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2E),
545 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
546 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2L),
547 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
548 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2G),
549 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
553 if (pci_is_root_bus(bus))
556 /* look for the host bridge */
557 while (!pci_is_root_bus(bus)) {
566 * Keystone PCI controller has a h/w limitation of
567 * 256 bytes maximum read request size. It can't handle
568 * anything higher than this. So force this limit on
569 * all downstream devices.
571 if (pci_match_id(rc_pci_devids, bridge)) {
572 if (pcie_get_readrq(dev) > 256) {
573 dev_info(&dev->dev, "limiting MRRS to 256\n");
574 pcie_set_readrq(dev, 256);
578 DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, ks_pcie_quirk);
580 static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
582 unsigned int irq = desc->irq_data.hwirq;
583 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
584 u32 offset = irq - ks_pcie->msi_host_irq;
585 struct dw_pcie *pci = ks_pcie->pci;
586 struct pcie_port *pp = &pci->pp;
587 struct device *dev = pci->dev;
588 struct irq_chip *chip = irq_desc_get_chip(desc);
589 u32 vector, virq, reg, pos;
591 dev_dbg(dev, "%s, irq %d\n", __func__, irq);
594 * The chained irq handler installation would have replaced normal
595 * interrupt driver handler so we need to take care of mask/unmask and
598 chained_irq_enter(chip, desc);
600 reg = ks_pcie_app_readl(ks_pcie, MSI_IRQ_STATUS(offset));
602 * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
603 * shows 1, 9, 17, 25 and so forth
605 for (pos = 0; pos < 4; pos++) {
606 if (!(reg & BIT(pos)))
609 vector = offset + (pos << 3);
610 virq = irq_linear_revmap(pp->irq_domain, vector);
611 dev_dbg(dev, "irq: bit %d, vector %d, virq %d\n", pos, vector,
613 generic_handle_irq(virq);
616 chained_irq_exit(chip, desc);
620 * ks_pcie_legacy_irq_handler() - Handle legacy interrupt
621 * @irq: IRQ line for legacy interrupts
622 * @desc: Pointer to irq descriptor
624 * Traverse through pending legacy interrupts and invoke handler for each. Also
625 * takes care of interrupt controller level mask/ack operation.
627 static void ks_pcie_legacy_irq_handler(struct irq_desc *desc)
629 unsigned int irq = irq_desc_get_irq(desc);
630 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
631 struct dw_pcie *pci = ks_pcie->pci;
632 struct device *dev = pci->dev;
633 u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0];
634 struct irq_chip *chip = irq_desc_get_chip(desc);
636 dev_dbg(dev, ": Handling legacy irq %d\n", irq);
639 * The chained irq handler installation would have replaced normal
640 * interrupt driver handler so we need to take care of mask/unmask and
643 chained_irq_enter(chip, desc);
644 ks_pcie_handle_legacy_irq(ks_pcie, irq_offset);
645 chained_irq_exit(chip, desc);
648 static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie)
650 struct device *dev = ks_pcie->pci->dev;
651 struct device_node *np = ks_pcie->np;
652 struct device_node *intc_np;
653 struct irq_data *irq_data;
654 int irq_count, irq, ret, i;
656 if (!IS_ENABLED(CONFIG_PCI_MSI))
659 intc_np = of_get_child_by_name(np, "msi-interrupt-controller");
663 dev_warn(dev, "msi-interrupt-controller node is absent\n");
667 irq_count = of_irq_count(intc_np);
669 dev_err(dev, "No IRQ entries in msi-interrupt-controller\n");
674 for (i = 0; i < irq_count; i++) {
675 irq = irq_of_parse_and_map(intc_np, i);
681 if (!ks_pcie->msi_host_irq) {
682 irq_data = irq_get_irq_data(irq);
687 ks_pcie->msi_host_irq = irq_data->hwirq;
690 irq_set_chained_handler_and_data(irq, ks_pcie_msi_irq_handler,
694 of_node_put(intc_np);
698 of_node_put(intc_np);
702 static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie)
704 struct device *dev = ks_pcie->pci->dev;
705 struct irq_domain *legacy_irq_domain;
706 struct device_node *np = ks_pcie->np;
707 struct device_node *intc_np;
708 int irq_count, irq, ret = 0, i;
710 intc_np = of_get_child_by_name(np, "legacy-interrupt-controller");
713 * Since legacy interrupts are modeled as edge-interrupts in
714 * AM6, keep it disabled for now.
718 dev_warn(dev, "legacy-interrupt-controller node is absent\n");
722 irq_count = of_irq_count(intc_np);
724 dev_err(dev, "No IRQ entries in legacy-interrupt-controller\n");
729 for (i = 0; i < irq_count; i++) {
730 irq = irq_of_parse_and_map(intc_np, i);
735 ks_pcie->legacy_host_irqs[i] = irq;
737 irq_set_chained_handler_and_data(irq,
738 ks_pcie_legacy_irq_handler,
743 irq_domain_add_linear(intc_np, PCI_NUM_INTX,
744 &ks_pcie_legacy_irq_domain_ops, NULL);
745 if (!legacy_irq_domain) {
746 dev_err(dev, "Failed to add irq domain for legacy irqs\n");
750 ks_pcie->legacy_irq_domain = legacy_irq_domain;
752 for (i = 0; i < PCI_NUM_INTX; i++)
753 ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_SET(i), INTx_EN);
756 of_node_put(intc_np);
762 * When a PCI device does not exist during config cycles, keystone host gets a
763 * bus error instead of returning 0xffffffff. This handler always returns 0
764 * for this kind of faults.
766 static int ks_pcie_fault(unsigned long addr, unsigned int fsr,
767 struct pt_regs *regs)
769 unsigned long instr = *(unsigned long *) instruction_pointer(regs);
771 if ((instr & 0x0e100090) == 0x00100090) {
772 int reg = (instr >> 12) & 15;
774 regs->uregs[reg] = -1;
782 static int __init ks_pcie_init_id(struct keystone_pcie *ks_pcie)
786 struct regmap *devctrl_regs;
787 struct dw_pcie *pci = ks_pcie->pci;
788 struct device *dev = pci->dev;
789 struct device_node *np = dev->of_node;
791 devctrl_regs = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-id");
792 if (IS_ERR(devctrl_regs))
793 return PTR_ERR(devctrl_regs);
795 ret = regmap_read(devctrl_regs, 0, &id);
799 dw_pcie_dbi_ro_wr_en(pci);
800 dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, id & PCIE_VENDORID_MASK);
801 dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, id >> PCIE_DEVICEID_SHIFT);
802 dw_pcie_dbi_ro_wr_dis(pci);
807 static int __init ks_pcie_host_init(struct pcie_port *pp)
809 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
810 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
813 pp->bridge->ops = &ks_pcie_ops;
814 pp->bridge->child_ops = &ks_child_pcie_ops;
816 ret = ks_pcie_config_legacy_irq(ks_pcie);
820 ret = ks_pcie_config_msi_irq(ks_pcie);
824 dw_pcie_setup_rc(pp);
826 ks_pcie_stop_link(pci);
827 ks_pcie_setup_rc_app_regs(ks_pcie);
828 writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
829 pci->dbi_base + PCI_IO_BASE);
831 ret = ks_pcie_init_id(ks_pcie);
837 * PCIe access errors that result into OCP errors are caught by ARM as
840 hook_fault_code(17, ks_pcie_fault, SIGBUS, 0,
841 "Asynchronous external abort");
844 ks_pcie_start_link(pci);
845 dw_pcie_wait_for_link(pci);
850 static const struct dw_pcie_host_ops ks_pcie_host_ops = {
851 .host_init = ks_pcie_host_init,
852 .msi_host_init = ks_pcie_msi_host_init,
855 static const struct dw_pcie_host_ops ks_pcie_am654_host_ops = {
856 .host_init = ks_pcie_host_init,
857 .msi_host_init = ks_pcie_am654_msi_host_init,
860 static irqreturn_t ks_pcie_err_irq_handler(int irq, void *priv)
862 struct keystone_pcie *ks_pcie = priv;
864 return ks_pcie_handle_error_irq(ks_pcie);
867 static int __init ks_pcie_add_pcie_port(struct keystone_pcie *ks_pcie,
868 struct platform_device *pdev)
870 struct dw_pcie *pci = ks_pcie->pci;
871 struct pcie_port *pp = &pci->pp;
872 struct device *dev = &pdev->dev;
875 ret = dw_pcie_host_init(pp);
877 dev_err(dev, "failed to initialize host\n");
884 static void ks_pcie_am654_write_dbi2(struct dw_pcie *pci, void __iomem *base,
885 u32 reg, size_t size, u32 val)
887 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
889 ks_pcie_set_dbi_mode(ks_pcie);
890 dw_pcie_write(base + reg, size, val);
891 ks_pcie_clear_dbi_mode(ks_pcie);
894 static const struct dw_pcie_ops ks_pcie_dw_pcie_ops = {
895 .start_link = ks_pcie_start_link,
896 .stop_link = ks_pcie_stop_link,
897 .link_up = ks_pcie_link_up,
898 .write_dbi2 = ks_pcie_am654_write_dbi2,
901 static void ks_pcie_am654_ep_init(struct dw_pcie_ep *ep)
903 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
906 ep->page_size = AM654_WIN_SIZE;
907 flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32;
908 dw_pcie_writel_dbi2(pci, PCI_BASE_ADDRESS_0, APP_ADDR_SPACE_0 - 1);
909 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, flags);
912 static void ks_pcie_am654_raise_legacy_irq(struct keystone_pcie *ks_pcie)
914 struct dw_pcie *pci = ks_pcie->pci;
917 int_pin = dw_pcie_readb_dbi(pci, PCI_INTERRUPT_PIN);
918 if (int_pin == 0 || int_pin > 4)
921 ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_SET(int_pin),
923 ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_SET, INT_ENABLE);
925 ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_CLR, INT_ENABLE);
926 ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_CLR(int_pin),
930 static int ks_pcie_am654_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
931 enum pci_epc_irq_type type,
934 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
935 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
938 case PCI_EPC_IRQ_LEGACY:
939 ks_pcie_am654_raise_legacy_irq(ks_pcie);
941 case PCI_EPC_IRQ_MSI:
942 dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
944 case PCI_EPC_IRQ_MSIX:
945 dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
948 dev_err(pci->dev, "UNKNOWN IRQ type\n");
955 static const struct pci_epc_features ks_pcie_am654_epc_features = {
956 .linkup_notifier = false,
958 .msix_capable = true,
959 .reserved_bar = 1 << BAR_0 | 1 << BAR_1,
960 .bar_fixed_64bit = 1 << BAR_0,
961 .bar_fixed_size[2] = SZ_1M,
962 .bar_fixed_size[3] = SZ_64K,
963 .bar_fixed_size[4] = 256,
964 .bar_fixed_size[5] = SZ_1M,
968 static const struct pci_epc_features*
969 ks_pcie_am654_get_features(struct dw_pcie_ep *ep)
971 return &ks_pcie_am654_epc_features;
974 static const struct dw_pcie_ep_ops ks_pcie_am654_ep_ops = {
975 .ep_init = ks_pcie_am654_ep_init,
976 .raise_irq = ks_pcie_am654_raise_irq,
977 .get_features = &ks_pcie_am654_get_features,
980 static int __init ks_pcie_add_pcie_ep(struct keystone_pcie *ks_pcie,
981 struct platform_device *pdev)
984 struct dw_pcie_ep *ep;
985 struct resource *res;
986 struct device *dev = &pdev->dev;
987 struct dw_pcie *pci = ks_pcie->pci;
991 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
995 ep->phys_base = res->start;
996 ep->addr_size = resource_size(res);
998 ret = dw_pcie_ep_init(ep);
1000 dev_err(dev, "failed to initialize endpoint\n");
1007 static void ks_pcie_disable_phy(struct keystone_pcie *ks_pcie)
1009 int num_lanes = ks_pcie->num_lanes;
1011 while (num_lanes--) {
1012 phy_power_off(ks_pcie->phy[num_lanes]);
1013 phy_exit(ks_pcie->phy[num_lanes]);
1017 static int ks_pcie_enable_phy(struct keystone_pcie *ks_pcie)
1021 int num_lanes = ks_pcie->num_lanes;
1023 for (i = 0; i < num_lanes; i++) {
1024 ret = phy_reset(ks_pcie->phy[i]);
1028 ret = phy_init(ks_pcie->phy[i]);
1032 ret = phy_power_on(ks_pcie->phy[i]);
1034 phy_exit(ks_pcie->phy[i]);
1043 phy_power_off(ks_pcie->phy[i]);
1044 phy_exit(ks_pcie->phy[i]);
1050 static int ks_pcie_set_mode(struct device *dev)
1052 struct device_node *np = dev->of_node;
1053 struct regmap *syscon;
1058 syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode");
1062 mask = KS_PCIE_DEV_TYPE_MASK | KS_PCIE_SYSCLOCKOUTEN;
1063 val = KS_PCIE_DEV_TYPE(RC) | KS_PCIE_SYSCLOCKOUTEN;
1065 ret = regmap_update_bits(syscon, 0, mask, val);
1067 dev_err(dev, "failed to set pcie mode\n");
1074 static int ks_pcie_am654_set_mode(struct device *dev,
1075 enum dw_pcie_device_mode mode)
1077 struct device_node *np = dev->of_node;
1078 struct regmap *syscon;
1083 syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode");
1087 mask = AM654_PCIE_DEV_TYPE_MASK;
1090 case DW_PCIE_RC_TYPE:
1093 case DW_PCIE_EP_TYPE:
1097 dev_err(dev, "INVALID device type %d\n", mode);
1101 ret = regmap_update_bits(syscon, 0, mask, val);
1103 dev_err(dev, "failed to set pcie mode\n");
1110 static const struct ks_pcie_of_data ks_pcie_rc_of_data = {
1111 .host_ops = &ks_pcie_host_ops,
1115 static const struct ks_pcie_of_data ks_pcie_am654_rc_of_data = {
1116 .host_ops = &ks_pcie_am654_host_ops,
1117 .mode = DW_PCIE_RC_TYPE,
1121 static const struct ks_pcie_of_data ks_pcie_am654_ep_of_data = {
1122 .ep_ops = &ks_pcie_am654_ep_ops,
1123 .mode = DW_PCIE_EP_TYPE,
1127 static const struct of_device_id ks_pcie_of_match[] = {
1130 .data = &ks_pcie_rc_of_data,
1131 .compatible = "ti,keystone-pcie",
1134 .data = &ks_pcie_am654_rc_of_data,
1135 .compatible = "ti,am654-pcie-rc",
1138 .data = &ks_pcie_am654_ep_of_data,
1139 .compatible = "ti,am654-pcie-ep",
1144 static int __init ks_pcie_probe(struct platform_device *pdev)
1146 const struct dw_pcie_host_ops *host_ops;
1147 const struct dw_pcie_ep_ops *ep_ops;
1148 struct device *dev = &pdev->dev;
1149 struct device_node *np = dev->of_node;
1150 const struct ks_pcie_of_data *data;
1151 const struct of_device_id *match;
1152 enum dw_pcie_device_mode mode;
1153 struct dw_pcie *pci;
1154 struct keystone_pcie *ks_pcie;
1155 struct device_link **link;
1156 struct gpio_desc *gpiod;
1157 struct resource *res;
1158 unsigned int version;
1167 match = of_match_device(of_match_ptr(ks_pcie_of_match), dev);
1168 data = (struct ks_pcie_of_data *)match->data;
1172 version = data->version;
1173 host_ops = data->host_ops;
1174 ep_ops = data->ep_ops;
1177 ks_pcie = devm_kzalloc(dev, sizeof(*ks_pcie), GFP_KERNEL);
1181 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
1185 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "app");
1186 ks_pcie->va_app_base = devm_ioremap_resource(dev, res);
1187 if (IS_ERR(ks_pcie->va_app_base))
1188 return PTR_ERR(ks_pcie->va_app_base);
1190 ks_pcie->app = *res;
1192 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbics");
1193 base = devm_pci_remap_cfg_resource(dev, res);
1195 return PTR_ERR(base);
1197 if (of_device_is_compatible(np, "ti,am654-pcie-rc"))
1198 ks_pcie->is_am6 = true;
1200 pci->dbi_base = base;
1201 pci->dbi_base2 = base;
1203 pci->ops = &ks_pcie_dw_pcie_ops;
1204 pci->version = version;
1206 irq = platform_get_irq(pdev, 0);
1210 ret = request_irq(irq, ks_pcie_err_irq_handler, IRQF_SHARED,
1211 "ks-pcie-error-irq", ks_pcie);
1213 dev_err(dev, "failed to request error IRQ %d\n",
1218 ret = of_property_read_u32(np, "num-lanes", &num_lanes);
1222 phy = devm_kzalloc(dev, sizeof(*phy) * num_lanes, GFP_KERNEL);
1226 link = devm_kzalloc(dev, sizeof(*link) * num_lanes, GFP_KERNEL);
1230 for (i = 0; i < num_lanes; i++) {
1231 snprintf(name, sizeof(name), "pcie-phy%d", i);
1232 phy[i] = devm_phy_optional_get(dev, name);
1233 if (IS_ERR(phy[i])) {
1234 ret = PTR_ERR(phy[i]);
1241 link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
1250 ks_pcie->link = link;
1251 ks_pcie->num_lanes = num_lanes;
1254 gpiod = devm_gpiod_get_optional(dev, "reset",
1256 if (IS_ERR(gpiod)) {
1257 ret = PTR_ERR(gpiod);
1258 if (ret != -EPROBE_DEFER)
1259 dev_err(dev, "Failed to get reset GPIO\n");
1263 ret = ks_pcie_enable_phy(ks_pcie);
1265 dev_err(dev, "failed to enable phy\n");
1269 platform_set_drvdata(pdev, ks_pcie);
1270 pm_runtime_enable(dev);
1271 ret = pm_runtime_get_sync(dev);
1273 dev_err(dev, "pm_runtime_get_sync failed\n");
1277 if (pci->version >= 0x480A)
1278 ret = ks_pcie_am654_set_mode(dev, mode);
1280 ret = ks_pcie_set_mode(dev);
1285 case DW_PCIE_RC_TYPE:
1286 if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_HOST)) {
1292 * "Power Sequencing and Reset Signal Timings" table in
1293 * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 2.0
1294 * indicates PERST# should be deasserted after minimum of 100us
1295 * once REFCLK is stable. The REFCLK to the connector in RC
1296 * mode is selected while enabling the PHY. So deassert PERST#
1300 usleep_range(100, 200);
1301 gpiod_set_value_cansleep(gpiod, 1);
1304 pci->pp.ops = host_ops;
1305 ret = ks_pcie_add_pcie_port(ks_pcie, pdev);
1309 case DW_PCIE_EP_TYPE:
1310 if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_EP)) {
1315 pci->ep.ops = ep_ops;
1316 ret = ks_pcie_add_pcie_ep(ks_pcie, pdev);
1321 dev_err(dev, "INVALID device type %d\n", mode);
1324 ks_pcie_enable_error_irq(ks_pcie);
1329 pm_runtime_put(dev);
1330 pm_runtime_disable(dev);
1331 ks_pcie_disable_phy(ks_pcie);
1334 while (--i >= 0 && link[i])
1335 device_link_del(link[i]);
1340 static int __exit ks_pcie_remove(struct platform_device *pdev)
1342 struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev);
1343 struct device_link **link = ks_pcie->link;
1344 int num_lanes = ks_pcie->num_lanes;
1345 struct device *dev = &pdev->dev;
1347 pm_runtime_put(dev);
1348 pm_runtime_disable(dev);
1349 ks_pcie_disable_phy(ks_pcie);
1351 device_link_del(link[num_lanes]);
1356 static struct platform_driver ks_pcie_driver __refdata = {
1357 .probe = ks_pcie_probe,
1358 .remove = __exit_p(ks_pcie_remove),
1360 .name = "keystone-pcie",
1361 .of_match_table = of_match_ptr(ks_pcie_of_match),
1364 builtin_platform_driver(ks_pcie_driver);