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_irq.h>
23 #include <linux/of_pci.h>
24 #include <linux/phy/phy.h>
25 #include <linux/platform_device.h>
26 #include <linux/regmap.h>
27 #include <linux/resource.h>
28 #include <linux/signal.h>
30 #include "../../pci.h"
31 #include "pcie-designware.h"
33 #define PCIE_VENDORID_MASK 0xffff
34 #define PCIE_DEVICEID_SHIFT 16
36 /* Application registers */
38 #define RTL GENMASK(15, 11)
40 #define AM6_PCI_PG1_RTL_VER 0x15
42 #define CMD_STATUS 0x004
43 #define LTSSM_EN_VAL BIT(0)
44 #define OB_XLAT_EN_VAL BIT(1)
45 #define DBI_CS2 BIT(5)
47 #define CFG_SETUP 0x008
48 #define CFG_BUS(x) (((x) & 0xff) << 16)
49 #define CFG_DEVICE(x) (((x) & 0x1f) << 8)
50 #define CFG_FUNC(x) ((x) & 0x7)
51 #define CFG_TYPE1 BIT(24)
54 #define OB_OFFSET_INDEX(n) (0x200 + (8 * (n)))
55 #define OB_OFFSET_HI(n) (0x204 + (8 * (n)))
56 #define OB_ENABLEN BIT(0)
57 #define OB_WIN_SIZE 8 /* 8MB */
59 #define PCIE_LEGACY_IRQ_ENABLE_SET(n) (0x188 + (0x10 * ((n) - 1)))
60 #define PCIE_LEGACY_IRQ_ENABLE_CLR(n) (0x18c + (0x10 * ((n) - 1)))
61 #define PCIE_EP_IRQ_SET 0x64
62 #define PCIE_EP_IRQ_CLR 0x68
63 #define INT_ENABLE BIT(0)
65 /* IRQ register defines */
69 #define MSI_IRQ_STATUS(n) (0x104 + ((n) << 4))
70 #define MSI_IRQ_ENABLE_SET(n) (0x108 + ((n) << 4))
71 #define MSI_IRQ_ENABLE_CLR(n) (0x10c + ((n) << 4))
72 #define MSI_IRQ_OFFSET 4
74 #define IRQ_STATUS(n) (0x184 + ((n) << 4))
75 #define IRQ_ENABLE_SET(n) (0x188 + ((n) << 4))
76 #define INTx_EN BIT(0)
78 #define ERR_IRQ_STATUS 0x1c4
79 #define ERR_IRQ_ENABLE_SET 0x1c8
80 #define ERR_AER BIT(5) /* ECRC error */
81 #define AM6_ERR_AER BIT(4) /* AM6 ECRC error */
82 #define ERR_AXI BIT(4) /* AXI tag lookup fatal error */
83 #define ERR_CORR BIT(3) /* Correctable error */
84 #define ERR_NONFATAL BIT(2) /* Non-fatal error */
85 #define ERR_FATAL BIT(1) /* Fatal error */
86 #define ERR_SYS BIT(0) /* System error */
87 #define ERR_IRQ_ALL (ERR_AER | ERR_AXI | ERR_CORR | \
88 ERR_NONFATAL | ERR_FATAL | ERR_SYS)
90 /* PCIE controller device IDs */
91 #define PCIE_RC_K2HK 0xb008
92 #define PCIE_RC_K2E 0xb009
93 #define PCIE_RC_K2L 0xb00a
94 #define PCIE_RC_K2G 0xb00b
96 #define KS_PCIE_DEV_TYPE_MASK (0x3 << 1)
97 #define KS_PCIE_DEV_TYPE(mode) ((mode) << 1)
103 #define KS_PCIE_SYSCLOCKOUTEN BIT(0)
105 #define AM654_PCIE_DEV_TYPE_MASK 0x3
106 #define AM654_WIN_SIZE SZ_64K
108 #define APP_ADDR_SPACE_0 (16 * SZ_1K)
110 #define to_keystone_pcie(x) dev_get_drvdata((x)->dev)
112 #define PCI_DEVICE_ID_TI_AM654X 0xb00c
114 struct ks_pcie_of_data {
115 enum dw_pcie_device_mode mode;
116 const struct dw_pcie_host_ops *host_ops;
117 const struct dw_pcie_ep_ops *ep_ops;
121 struct keystone_pcie {
125 int intx_host_irqs[PCI_NUM_INTX];
131 struct device_link **link;
132 struct device_node *msi_intc_np;
133 struct irq_domain *intx_irq_domain;
134 struct device_node *np;
136 /* Application register space */
137 void __iomem *va_app_base; /* DT 1st resource */
142 static u32 ks_pcie_app_readl(struct keystone_pcie *ks_pcie, u32 offset)
144 return readl(ks_pcie->va_app_base + offset);
147 static void ks_pcie_app_writel(struct keystone_pcie *ks_pcie, u32 offset,
150 writel(val, ks_pcie->va_app_base + offset);
153 static void ks_pcie_msi_irq_ack(struct irq_data *data)
155 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data);
156 struct keystone_pcie *ks_pcie;
157 u32 irq = data->hwirq;
162 pci = to_dw_pcie_from_pp(pp);
163 ks_pcie = to_keystone_pcie(pci);
165 reg_offset = irq % 8;
168 ks_pcie_app_writel(ks_pcie, MSI_IRQ_STATUS(reg_offset),
170 ks_pcie_app_writel(ks_pcie, IRQ_EOI, reg_offset + MSI_IRQ_OFFSET);
173 static void ks_pcie_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
175 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data);
176 struct keystone_pcie *ks_pcie;
180 pci = to_dw_pcie_from_pp(pp);
181 ks_pcie = to_keystone_pcie(pci);
183 msi_target = ks_pcie->app.start + MSI_IRQ;
184 msg->address_lo = lower_32_bits(msi_target);
185 msg->address_hi = upper_32_bits(msi_target);
186 msg->data = data->hwirq;
188 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
189 (int)data->hwirq, msg->address_hi, msg->address_lo);
192 static int ks_pcie_msi_set_affinity(struct irq_data *irq_data,
193 const struct cpumask *mask, bool force)
198 static void ks_pcie_msi_mask(struct irq_data *data)
200 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data);
201 struct keystone_pcie *ks_pcie;
202 u32 irq = data->hwirq;
208 raw_spin_lock_irqsave(&pp->lock, flags);
210 pci = to_dw_pcie_from_pp(pp);
211 ks_pcie = to_keystone_pcie(pci);
213 reg_offset = irq % 8;
216 ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_CLR(reg_offset),
219 raw_spin_unlock_irqrestore(&pp->lock, flags);
222 static void ks_pcie_msi_unmask(struct irq_data *data)
224 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data);
225 struct keystone_pcie *ks_pcie;
226 u32 irq = data->hwirq;
232 raw_spin_lock_irqsave(&pp->lock, flags);
234 pci = to_dw_pcie_from_pp(pp);
235 ks_pcie = to_keystone_pcie(pci);
237 reg_offset = irq % 8;
240 ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_SET(reg_offset),
243 raw_spin_unlock_irqrestore(&pp->lock, flags);
246 static struct irq_chip ks_pcie_msi_irq_chip = {
247 .name = "KEYSTONE-PCI-MSI",
248 .irq_ack = ks_pcie_msi_irq_ack,
249 .irq_compose_msi_msg = ks_pcie_compose_msi_msg,
250 .irq_set_affinity = ks_pcie_msi_set_affinity,
251 .irq_mask = ks_pcie_msi_mask,
252 .irq_unmask = ks_pcie_msi_unmask,
256 * ks_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask registers
257 * @ks_pcie: A pointer to the keystone_pcie structure which holds the KeyStone
258 * PCIe host controller driver information.
260 * Since modification of dbi_cs2 involves different clock domain, read the
261 * status back to ensure the transition is complete.
263 static void ks_pcie_set_dbi_mode(struct keystone_pcie *ks_pcie)
267 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
269 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
272 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
273 } while (!(val & DBI_CS2));
277 * ks_pcie_clear_dbi_mode() - Disable DBI mode
278 * @ks_pcie: A pointer to the keystone_pcie structure which holds the KeyStone
279 * PCIe host controller driver information.
281 * Since modification of dbi_cs2 involves different clock domain, read the
282 * status back to ensure the transition is complete.
284 static void ks_pcie_clear_dbi_mode(struct keystone_pcie *ks_pcie)
288 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
290 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
293 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
294 } while (val & DBI_CS2);
297 static int ks_pcie_msi_host_init(struct dw_pcie_rp *pp)
299 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
300 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
302 /* Configure and set up BAR0 */
303 ks_pcie_set_dbi_mode(ks_pcie);
306 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 1);
307 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, SZ_4K - 1);
309 ks_pcie_clear_dbi_mode(ks_pcie);
312 * For BAR0, just setting bus address for inbound writes (MSI) should
313 * be sufficient. Use physical address to avoid any conflicts.
315 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, ks_pcie->app.start);
317 pp->msi_irq_chip = &ks_pcie_msi_irq_chip;
318 return dw_pcie_allocate_domains(pp);
321 static void ks_pcie_handle_intx_irq(struct keystone_pcie *ks_pcie,
324 struct dw_pcie *pci = ks_pcie->pci;
325 struct device *dev = pci->dev;
328 pending = ks_pcie_app_readl(ks_pcie, IRQ_STATUS(offset));
330 if (BIT(0) & pending) {
331 dev_dbg(dev, ": irq: irq_offset %d", offset);
332 generic_handle_domain_irq(ks_pcie->intx_irq_domain, offset);
335 /* EOI the INTx interrupt */
336 ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset);
339 static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
341 ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
344 static irqreturn_t ks_pcie_handle_error_irq(struct keystone_pcie *ks_pcie)
347 struct device *dev = ks_pcie->pci->dev;
349 reg = ks_pcie_app_readl(ks_pcie, ERR_IRQ_STATUS);
354 dev_err(dev, "System Error\n");
357 dev_err(dev, "Fatal Error\n");
359 if (reg & ERR_NONFATAL)
360 dev_dbg(dev, "Non Fatal Error\n");
363 dev_dbg(dev, "Correctable Error\n");
365 if (!ks_pcie->is_am6 && (reg & ERR_AXI))
366 dev_err(dev, "AXI tag lookup fatal Error\n");
368 if (reg & ERR_AER || (ks_pcie->is_am6 && (reg & AM6_ERR_AER)))
369 dev_err(dev, "ECRC Error\n");
371 ks_pcie_app_writel(ks_pcie, ERR_IRQ_STATUS, reg);
376 static void ks_pcie_ack_intx_irq(struct irq_data *d)
380 static void ks_pcie_mask_intx_irq(struct irq_data *d)
384 static void ks_pcie_unmask_intx_irq(struct irq_data *d)
388 static struct irq_chip ks_pcie_intx_irq_chip = {
389 .name = "Keystone-PCI-INTX-IRQ",
390 .irq_ack = ks_pcie_ack_intx_irq,
391 .irq_mask = ks_pcie_mask_intx_irq,
392 .irq_unmask = ks_pcie_unmask_intx_irq,
395 static int ks_pcie_init_intx_irq_map(struct irq_domain *d,
396 unsigned int irq, irq_hw_number_t hw_irq)
398 irq_set_chip_and_handler(irq, &ks_pcie_intx_irq_chip,
400 irq_set_chip_data(irq, d->host_data);
405 static const struct irq_domain_ops ks_pcie_intx_irq_domain_ops = {
406 .map = ks_pcie_init_intx_irq_map,
407 .xlate = irq_domain_xlate_onetwocell,
410 static int ks_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
413 u32 num_viewport = ks_pcie->num_viewport;
414 struct dw_pcie *pci = ks_pcie->pci;
415 struct dw_pcie_rp *pp = &pci->pp;
416 struct resource_entry *entry;
417 struct resource *mem;
421 entry = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
429 /* Disable BARs for inbound access */
430 ks_pcie_set_dbi_mode(ks_pcie);
431 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
432 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0);
433 ks_pcie_clear_dbi_mode(ks_pcie);
438 val = ilog2(OB_WIN_SIZE);
439 ks_pcie_app_writel(ks_pcie, OB_SIZE, val);
441 /* Using Direct 1:1 mapping of RC <-> PCI memory space */
442 for (i = 0; i < num_viewport && (start < end); i++) {
443 ks_pcie_app_writel(ks_pcie, OB_OFFSET_INDEX(i),
444 lower_32_bits(start) | OB_ENABLEN);
445 ks_pcie_app_writel(ks_pcie, OB_OFFSET_HI(i),
446 upper_32_bits(start));
447 start += OB_WIN_SIZE * SZ_1M;
450 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
451 val |= OB_XLAT_EN_VAL;
452 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
457 static void __iomem *ks_pcie_other_map_bus(struct pci_bus *bus,
458 unsigned int devfn, int where)
460 struct dw_pcie_rp *pp = bus->sysdata;
461 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
462 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
465 reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
466 CFG_FUNC(PCI_FUNC(devfn));
467 if (!pci_is_root_bus(bus->parent))
469 ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg);
471 return pp->va_cfg0_base + where;
474 static struct pci_ops ks_child_pcie_ops = {
475 .map_bus = ks_pcie_other_map_bus,
476 .read = pci_generic_config_read,
477 .write = pci_generic_config_write,
480 static struct pci_ops ks_pcie_ops = {
481 .map_bus = dw_pcie_own_conf_map_bus,
482 .read = pci_generic_config_read,
483 .write = pci_generic_config_write,
487 * ks_pcie_link_up() - Check if link up
488 * @pci: A pointer to the dw_pcie structure which holds the DesignWare PCIe host
489 * controller driver information.
491 static int ks_pcie_link_up(struct dw_pcie *pci)
495 val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0);
496 val &= PORT_LOGIC_LTSSM_STATE_MASK;
497 return (val == PORT_LOGIC_LTSSM_STATE_L0);
500 static void ks_pcie_stop_link(struct dw_pcie *pci)
502 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
505 /* Disable Link training */
506 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
507 val &= ~LTSSM_EN_VAL;
508 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
511 static int ks_pcie_start_link(struct dw_pcie *pci)
513 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
516 /* Initiate Link Training */
517 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
518 ks_pcie_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
523 static void ks_pcie_quirk(struct pci_dev *dev)
525 struct pci_bus *bus = dev->bus;
526 struct keystone_pcie *ks_pcie;
527 struct device *bridge_dev;
528 struct pci_dev *bridge;
531 static const struct pci_device_id rc_pci_devids[] = {
532 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2HK),
533 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, },
534 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2E),
535 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, },
536 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2L),
537 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, },
538 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2G),
539 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, },
542 static const struct pci_device_id am6_pci_devids[] = {
543 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_AM654X),
544 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
548 if (pci_is_root_bus(bus))
551 /* look for the host bridge */
552 while (!pci_is_root_bus(bus)) {
561 * Keystone PCI controller has a h/w limitation of
562 * 256 bytes maximum read request size. It can't handle
563 * anything higher than this. So force this limit on
564 * all downstream devices.
566 if (pci_match_id(rc_pci_devids, bridge)) {
567 if (pcie_get_readrq(dev) > 256) {
568 dev_info(&dev->dev, "limiting MRRS to 256 bytes\n");
569 pcie_set_readrq(dev, 256);
574 * Memory transactions fail with PCI controller in AM654 PG1.0
575 * when MRRS is set to more than 128 bytes. Force the MRRS to
576 * 128 bytes in all downstream devices.
578 if (pci_match_id(am6_pci_devids, bridge)) {
579 bridge_dev = pci_get_host_bridge_device(dev);
580 if (!bridge_dev && !bridge_dev->parent)
583 ks_pcie = dev_get_drvdata(bridge_dev->parent);
587 val = ks_pcie_app_readl(ks_pcie, PID);
590 if (val != AM6_PCI_PG1_RTL_VER)
593 if (pcie_get_readrq(dev) > 128) {
594 dev_info(&dev->dev, "limiting MRRS to 128 bytes\n");
595 pcie_set_readrq(dev, 128);
599 DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, ks_pcie_quirk);
601 static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
603 unsigned int irq = desc->irq_data.hwirq;
604 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
605 u32 offset = irq - ks_pcie->msi_host_irq;
606 struct dw_pcie *pci = ks_pcie->pci;
607 struct dw_pcie_rp *pp = &pci->pp;
608 struct device *dev = pci->dev;
609 struct irq_chip *chip = irq_desc_get_chip(desc);
610 u32 vector, reg, pos;
612 dev_dbg(dev, "%s, irq %d\n", __func__, irq);
615 * The chained irq handler installation would have replaced normal
616 * interrupt driver handler so we need to take care of mask/unmask and
619 chained_irq_enter(chip, desc);
621 reg = ks_pcie_app_readl(ks_pcie, MSI_IRQ_STATUS(offset));
623 * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
624 * shows 1, 9, 17, 25 and so forth
626 for (pos = 0; pos < 4; pos++) {
627 if (!(reg & BIT(pos)))
630 vector = offset + (pos << 3);
631 dev_dbg(dev, "irq: bit %d, vector %d\n", pos, vector);
632 generic_handle_domain_irq(pp->irq_domain, vector);
635 chained_irq_exit(chip, desc);
639 * ks_pcie_intx_irq_handler() - Handle INTX interrupt
640 * @desc: Pointer to irq descriptor
642 * Traverse through pending INTX interrupts and invoke handler for each. Also
643 * takes care of interrupt controller level mask/ack operation.
645 static void ks_pcie_intx_irq_handler(struct irq_desc *desc)
647 unsigned int irq = irq_desc_get_irq(desc);
648 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
649 struct dw_pcie *pci = ks_pcie->pci;
650 struct device *dev = pci->dev;
651 u32 irq_offset = irq - ks_pcie->intx_host_irqs[0];
652 struct irq_chip *chip = irq_desc_get_chip(desc);
654 dev_dbg(dev, ": Handling INTX irq %d\n", irq);
657 * The chained irq handler installation would have replaced normal
658 * interrupt driver handler so we need to take care of mask/unmask and
661 chained_irq_enter(chip, desc);
662 ks_pcie_handle_intx_irq(ks_pcie, irq_offset);
663 chained_irq_exit(chip, desc);
666 static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie)
668 struct device *dev = ks_pcie->pci->dev;
669 struct device_node *np = ks_pcie->np;
670 struct device_node *intc_np;
671 struct irq_data *irq_data;
672 int irq_count, irq, ret, i;
674 if (!IS_ENABLED(CONFIG_PCI_MSI))
677 intc_np = of_get_child_by_name(np, "msi-interrupt-controller");
681 dev_warn(dev, "msi-interrupt-controller node is absent\n");
685 irq_count = of_irq_count(intc_np);
687 dev_err(dev, "No IRQ entries in msi-interrupt-controller\n");
692 for (i = 0; i < irq_count; i++) {
693 irq = irq_of_parse_and_map(intc_np, i);
699 if (!ks_pcie->msi_host_irq) {
700 irq_data = irq_get_irq_data(irq);
705 ks_pcie->msi_host_irq = irq_data->hwirq;
708 irq_set_chained_handler_and_data(irq, ks_pcie_msi_irq_handler,
712 of_node_put(intc_np);
716 of_node_put(intc_np);
720 static int ks_pcie_config_intx_irq(struct keystone_pcie *ks_pcie)
722 struct device *dev = ks_pcie->pci->dev;
723 struct irq_domain *intx_irq_domain;
724 struct device_node *np = ks_pcie->np;
725 struct device_node *intc_np;
726 int irq_count, irq, ret = 0, i;
728 intc_np = of_get_child_by_name(np, "legacy-interrupt-controller");
731 * Since INTX interrupts are modeled as edge-interrupts in
732 * AM6, keep it disabled for now.
736 dev_warn(dev, "legacy-interrupt-controller node is absent\n");
740 irq_count = of_irq_count(intc_np);
742 dev_err(dev, "No IRQ entries in legacy-interrupt-controller\n");
747 for (i = 0; i < irq_count; i++) {
748 irq = irq_of_parse_and_map(intc_np, i);
753 ks_pcie->intx_host_irqs[i] = irq;
755 irq_set_chained_handler_and_data(irq,
756 ks_pcie_intx_irq_handler,
760 intx_irq_domain = irq_domain_add_linear(intc_np, PCI_NUM_INTX,
761 &ks_pcie_intx_irq_domain_ops, NULL);
762 if (!intx_irq_domain) {
763 dev_err(dev, "Failed to add irq domain for INTX irqs\n");
767 ks_pcie->intx_irq_domain = intx_irq_domain;
769 for (i = 0; i < PCI_NUM_INTX; i++)
770 ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_SET(i), INTx_EN);
773 of_node_put(intc_np);
779 * When a PCI device does not exist during config cycles, keystone host
780 * gets a bus error instead of returning 0xffffffff (PCI_ERROR_RESPONSE).
781 * This handler always returns 0 for this kind of fault.
783 static int ks_pcie_fault(unsigned long addr, unsigned int fsr,
784 struct pt_regs *regs)
786 unsigned long instr = *(unsigned long *) instruction_pointer(regs);
788 if ((instr & 0x0e100090) == 0x00100090) {
789 int reg = (instr >> 12) & 15;
791 regs->uregs[reg] = -1;
799 static int __init ks_pcie_init_id(struct keystone_pcie *ks_pcie)
803 struct regmap *devctrl_regs;
804 struct dw_pcie *pci = ks_pcie->pci;
805 struct device *dev = pci->dev;
806 struct device_node *np = dev->of_node;
807 struct of_phandle_args args;
808 unsigned int offset = 0;
810 devctrl_regs = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-id");
811 if (IS_ERR(devctrl_regs))
812 return PTR_ERR(devctrl_regs);
814 /* Do not error out to maintain old DT compatibility */
815 ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-pcie-id", 1, 0, &args);
817 offset = args.args[0];
819 ret = regmap_read(devctrl_regs, offset, &id);
823 dw_pcie_dbi_ro_wr_en(pci);
824 dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, id & PCIE_VENDORID_MASK);
825 dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, id >> PCIE_DEVICEID_SHIFT);
826 dw_pcie_dbi_ro_wr_dis(pci);
831 static int __init ks_pcie_host_init(struct dw_pcie_rp *pp)
833 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
834 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
837 pp->bridge->ops = &ks_pcie_ops;
838 if (!ks_pcie->is_am6)
839 pp->bridge->child_ops = &ks_child_pcie_ops;
841 ret = ks_pcie_config_intx_irq(ks_pcie);
845 ret = ks_pcie_config_msi_irq(ks_pcie);
849 ks_pcie_stop_link(pci);
850 ret = ks_pcie_setup_rc_app_regs(ks_pcie);
854 writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
855 pci->dbi_base + PCI_IO_BASE);
857 ret = ks_pcie_init_id(ks_pcie);
863 * PCIe access errors that result into OCP errors are caught by ARM as
866 hook_fault_code(17, ks_pcie_fault, SIGBUS, 0,
867 "Asynchronous external abort");
873 static const struct dw_pcie_host_ops ks_pcie_host_ops = {
874 .init = ks_pcie_host_init,
875 .msi_init = ks_pcie_msi_host_init,
878 static const struct dw_pcie_host_ops ks_pcie_am654_host_ops = {
879 .init = ks_pcie_host_init,
882 static irqreturn_t ks_pcie_err_irq_handler(int irq, void *priv)
884 struct keystone_pcie *ks_pcie = priv;
886 return ks_pcie_handle_error_irq(ks_pcie);
889 static void ks_pcie_am654_write_dbi2(struct dw_pcie *pci, void __iomem *base,
890 u32 reg, size_t size, u32 val)
892 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
894 ks_pcie_set_dbi_mode(ks_pcie);
895 dw_pcie_write(base + reg, size, val);
896 ks_pcie_clear_dbi_mode(ks_pcie);
899 static const struct dw_pcie_ops ks_pcie_dw_pcie_ops = {
900 .start_link = ks_pcie_start_link,
901 .stop_link = ks_pcie_stop_link,
902 .link_up = ks_pcie_link_up,
903 .write_dbi2 = ks_pcie_am654_write_dbi2,
906 static void ks_pcie_am654_ep_init(struct dw_pcie_ep *ep)
908 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
911 ep->page_size = AM654_WIN_SIZE;
912 flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32;
913 dw_pcie_writel_dbi2(pci, PCI_BASE_ADDRESS_0, APP_ADDR_SPACE_0 - 1);
914 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, flags);
917 static void ks_pcie_am654_raise_intx_irq(struct keystone_pcie *ks_pcie)
919 struct dw_pcie *pci = ks_pcie->pci;
922 int_pin = dw_pcie_readb_dbi(pci, PCI_INTERRUPT_PIN);
923 if (int_pin == 0 || int_pin > 4)
926 ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_SET(int_pin),
928 ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_SET, INT_ENABLE);
930 ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_CLR, INT_ENABLE);
931 ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_CLR(int_pin),
935 static int ks_pcie_am654_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
936 unsigned int type, u16 interrupt_num)
938 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
939 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
943 ks_pcie_am654_raise_intx_irq(ks_pcie);
946 dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
949 dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
952 dev_err(pci->dev, "UNKNOWN IRQ type\n");
959 static const struct pci_epc_features ks_pcie_am654_epc_features = {
960 .linkup_notifier = false,
962 .msix_capable = true,
963 .bar[BAR_0] = { .type = BAR_RESERVED, },
964 .bar[BAR_1] = { .type = BAR_RESERVED, },
965 .bar[BAR_2] = { .type = BAR_FIXED, .fixed_size = SZ_1M, },
966 .bar[BAR_3] = { .type = BAR_FIXED, .fixed_size = SZ_64K, },
967 .bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256, },
968 .bar[BAR_5] = { .type = BAR_FIXED, .fixed_size = SZ_1M, },
972 static const struct pci_epc_features*
973 ks_pcie_am654_get_features(struct dw_pcie_ep *ep)
975 return &ks_pcie_am654_epc_features;
978 static const struct dw_pcie_ep_ops ks_pcie_am654_ep_ops = {
979 .init = ks_pcie_am654_ep_init,
980 .raise_irq = ks_pcie_am654_raise_irq,
981 .get_features = &ks_pcie_am654_get_features,
984 static void ks_pcie_disable_phy(struct keystone_pcie *ks_pcie)
986 int num_lanes = ks_pcie->num_lanes;
988 while (num_lanes--) {
989 phy_power_off(ks_pcie->phy[num_lanes]);
990 phy_exit(ks_pcie->phy[num_lanes]);
994 static int ks_pcie_enable_phy(struct keystone_pcie *ks_pcie)
998 int num_lanes = ks_pcie->num_lanes;
1000 for (i = 0; i < num_lanes; i++) {
1001 ret = phy_reset(ks_pcie->phy[i]);
1005 ret = phy_init(ks_pcie->phy[i]);
1009 ret = phy_power_on(ks_pcie->phy[i]);
1011 phy_exit(ks_pcie->phy[i]);
1020 phy_power_off(ks_pcie->phy[i]);
1021 phy_exit(ks_pcie->phy[i]);
1027 static int ks_pcie_set_mode(struct device *dev)
1029 struct device_node *np = dev->of_node;
1030 struct of_phandle_args args;
1031 unsigned int offset = 0;
1032 struct regmap *syscon;
1037 syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode");
1041 /* Do not error out to maintain old DT compatibility */
1042 ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-pcie-mode", 1, 0, &args);
1044 offset = args.args[0];
1046 mask = KS_PCIE_DEV_TYPE_MASK | KS_PCIE_SYSCLOCKOUTEN;
1047 val = KS_PCIE_DEV_TYPE(RC) | KS_PCIE_SYSCLOCKOUTEN;
1049 ret = regmap_update_bits(syscon, offset, mask, val);
1051 dev_err(dev, "failed to set pcie mode\n");
1058 static int ks_pcie_am654_set_mode(struct device *dev,
1059 enum dw_pcie_device_mode mode)
1061 struct device_node *np = dev->of_node;
1062 struct of_phandle_args args;
1063 unsigned int offset = 0;
1064 struct regmap *syscon;
1069 syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode");
1073 /* Do not error out to maintain old DT compatibility */
1074 ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-pcie-mode", 1, 0, &args);
1076 offset = args.args[0];
1078 mask = AM654_PCIE_DEV_TYPE_MASK;
1081 case DW_PCIE_RC_TYPE:
1084 case DW_PCIE_EP_TYPE:
1088 dev_err(dev, "INVALID device type %d\n", mode);
1092 ret = regmap_update_bits(syscon, offset, mask, val);
1094 dev_err(dev, "failed to set pcie mode\n");
1101 static const struct ks_pcie_of_data ks_pcie_rc_of_data = {
1102 .host_ops = &ks_pcie_host_ops,
1103 .version = DW_PCIE_VER_365A,
1106 static const struct ks_pcie_of_data ks_pcie_am654_rc_of_data = {
1107 .host_ops = &ks_pcie_am654_host_ops,
1108 .mode = DW_PCIE_RC_TYPE,
1109 .version = DW_PCIE_VER_490A,
1112 static const struct ks_pcie_of_data ks_pcie_am654_ep_of_data = {
1113 .ep_ops = &ks_pcie_am654_ep_ops,
1114 .mode = DW_PCIE_EP_TYPE,
1115 .version = DW_PCIE_VER_490A,
1118 static const struct of_device_id ks_pcie_of_match[] = {
1121 .data = &ks_pcie_rc_of_data,
1122 .compatible = "ti,keystone-pcie",
1125 .data = &ks_pcie_am654_rc_of_data,
1126 .compatible = "ti,am654-pcie-rc",
1129 .data = &ks_pcie_am654_ep_of_data,
1130 .compatible = "ti,am654-pcie-ep",
1135 static int ks_pcie_probe(struct platform_device *pdev)
1137 const struct dw_pcie_host_ops *host_ops;
1138 const struct dw_pcie_ep_ops *ep_ops;
1139 struct device *dev = &pdev->dev;
1140 struct device_node *np = dev->of_node;
1141 const struct ks_pcie_of_data *data;
1142 enum dw_pcie_device_mode mode;
1143 struct dw_pcie *pci;
1144 struct keystone_pcie *ks_pcie;
1145 struct device_link **link;
1146 struct gpio_desc *gpiod;
1147 struct resource *res;
1158 data = of_device_get_match_data(dev);
1162 version = data->version;
1163 host_ops = data->host_ops;
1164 ep_ops = data->ep_ops;
1167 ks_pcie = devm_kzalloc(dev, sizeof(*ks_pcie), GFP_KERNEL);
1171 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
1175 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "app");
1176 ks_pcie->va_app_base = devm_ioremap_resource(dev, res);
1177 if (IS_ERR(ks_pcie->va_app_base))
1178 return PTR_ERR(ks_pcie->va_app_base);
1180 ks_pcie->app = *res;
1182 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbics");
1183 base = devm_pci_remap_cfg_resource(dev, res);
1185 return PTR_ERR(base);
1187 if (of_device_is_compatible(np, "ti,am654-pcie-rc"))
1188 ks_pcie->is_am6 = true;
1190 pci->dbi_base = base;
1191 pci->dbi_base2 = base;
1193 pci->ops = &ks_pcie_dw_pcie_ops;
1194 pci->version = version;
1196 irq = platform_get_irq(pdev, 0);
1200 ret = request_irq(irq, ks_pcie_err_irq_handler, IRQF_SHARED,
1201 "ks-pcie-error-irq", ks_pcie);
1203 dev_err(dev, "failed to request error IRQ %d\n",
1208 ret = of_property_read_u32(np, "num-lanes", &num_lanes);
1212 phy = devm_kzalloc(dev, sizeof(*phy) * num_lanes, GFP_KERNEL);
1216 link = devm_kzalloc(dev, sizeof(*link) * num_lanes, GFP_KERNEL);
1220 for (i = 0; i < num_lanes; i++) {
1221 snprintf(name, sizeof(name), "pcie-phy%d", i);
1222 phy[i] = devm_phy_optional_get(dev, name);
1223 if (IS_ERR(phy[i])) {
1224 ret = PTR_ERR(phy[i]);
1231 link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
1240 ks_pcie->link = link;
1241 ks_pcie->num_lanes = num_lanes;
1244 gpiod = devm_gpiod_get_optional(dev, "reset",
1246 if (IS_ERR(gpiod)) {
1247 ret = PTR_ERR(gpiod);
1248 if (ret != -EPROBE_DEFER)
1249 dev_err(dev, "Failed to get reset GPIO\n");
1253 /* Obtain references to the PHYs */
1254 for (i = 0; i < num_lanes; i++)
1255 phy_pm_runtime_get_sync(ks_pcie->phy[i]);
1257 ret = ks_pcie_enable_phy(ks_pcie);
1259 /* Release references to the PHYs */
1260 for (i = 0; i < num_lanes; i++)
1261 phy_pm_runtime_put_sync(ks_pcie->phy[i]);
1264 dev_err(dev, "failed to enable phy\n");
1268 platform_set_drvdata(pdev, ks_pcie);
1269 pm_runtime_enable(dev);
1270 ret = pm_runtime_get_sync(dev);
1272 dev_err(dev, "pm_runtime_get_sync failed\n");
1276 if (dw_pcie_ver_is_ge(pci, 480A))
1277 ret = ks_pcie_am654_set_mode(dev, mode);
1279 ret = ks_pcie_set_mode(dev);
1284 case DW_PCIE_RC_TYPE:
1285 if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_HOST)) {
1290 ret = of_property_read_u32(np, "num-viewport", &num_viewport);
1292 dev_err(dev, "unable to read *num-viewport* property\n");
1297 * "Power Sequencing and Reset Signal Timings" table in
1298 * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 2.0
1299 * indicates PERST# should be deasserted after minimum of 100us
1300 * once REFCLK is stable. The REFCLK to the connector in RC
1301 * mode is selected while enabling the PHY. So deassert PERST#
1305 usleep_range(100, 200);
1306 gpiod_set_value_cansleep(gpiod, 1);
1309 ks_pcie->num_viewport = num_viewport;
1310 pci->pp.ops = host_ops;
1311 ret = dw_pcie_host_init(&pci->pp);
1315 case DW_PCIE_EP_TYPE:
1316 if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_EP)) {
1321 pci->ep.ops = ep_ops;
1322 ret = dw_pcie_ep_init(&pci->ep);
1326 ret = dw_pcie_ep_init_registers(&pci->ep);
1328 dev_err(dev, "Failed to initialize DWC endpoint registers\n");
1332 pci_epc_init_notify(pci->ep.epc);
1336 dev_err(dev, "INVALID device type %d\n", mode);
1339 ks_pcie_enable_error_irq(ks_pcie);
1344 dw_pcie_ep_deinit(&pci->ep);
1346 pm_runtime_put(dev);
1347 pm_runtime_disable(dev);
1348 ks_pcie_disable_phy(ks_pcie);
1351 while (--i >= 0 && link[i])
1352 device_link_del(link[i]);
1357 static void ks_pcie_remove(struct platform_device *pdev)
1359 struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev);
1360 struct device_link **link = ks_pcie->link;
1361 int num_lanes = ks_pcie->num_lanes;
1362 struct device *dev = &pdev->dev;
1364 pm_runtime_put(dev);
1365 pm_runtime_disable(dev);
1366 ks_pcie_disable_phy(ks_pcie);
1368 device_link_del(link[num_lanes]);
1371 static struct platform_driver ks_pcie_driver = {
1372 .probe = ks_pcie_probe,
1373 .remove_new = ks_pcie_remove,
1375 .name = "keystone-pcie",
1376 .of_match_table = ks_pcie_of_match,
1379 builtin_platform_driver(ks_pcie_driver);