Merge branch 'pci/controller/cadence'

- Drop a runtime PM 'put' to resolve a runtime atomic count underflow (Hans Zhang) - Use shared PCIE_MSG_CODE_* definitions and remove duplicate cdns_pcie_msg_code definitions (Hans Zhang) - Make the cadence core buildable as a module (Kishon Vijay Abraham I) - Add cdns_pcie_host_disable() and cdns_pcie_ep_disable() for use by loadable drivers when they are removed (Siddharth Vadapalli) - Make j721e buildable as a loadable and removable module (Siddharth Vadapalli) - Fix j721e host/endpoint dependencies that result in link failures in some configs (Arnd Bergmann) * pci/controller/cadence: PCI: j721e: Fix host/endpoint dependencies PCI: j721e: Add support to build as a loadable module PCI: cadence-ep: Introduce cdns_pcie_ep_disable() helper for cleanup PCI: cadence-host: Introduce cdns_pcie_host_disable() helper for cleanup PCI: cadence: Add support to build pcie-cadence library as a kernel module PCI: cadence: Remove duplicate message code definitions PCI: cadence: Fix runtime atomic count underflow
2026-02-19 10:11:56 -05:00 · 2025-06-04 10:50:04 -05:00
parent c3b2f9dccb 3c05e88413
commit 3f0b36295e
6 changed files with 197 additions and 36 deletions
--- a/drivers/pci/controller/cadence/Kconfig
+++ b/drivers/pci/controller/cadence/Kconfig
@@ -4,16 +4,16 @@ menu "Cadence-based PCIe controllers"
 	depends on PCI

 config PCIE_CADENCE
-	bool
+	tristate

 config PCIE_CADENCE_HOST
-	bool
+	tristate
 	depends on OF
 	select IRQ_DOMAIN
 	select PCIE_CADENCE

 config PCIE_CADENCE_EP
-	bool
+	tristate
 	depends on OF
 	depends on PCI_ENDPOINT
 	select PCIE_CADENCE
@@ -43,13 +43,14 @@ config PCIE_CADENCE_PLAT_EP
 	  different vendors SoCs.

 config PCI_J721E
-	bool
+	tristate
+	select PCIE_CADENCE_HOST if PCI_J721E_HOST != n
+	select PCIE_CADENCE_EP if PCI_J721E_EP != n

 config PCI_J721E_HOST
-	bool "TI J721E PCIe controller (host mode)"
+	tristate "TI J721E PCIe controller (host mode)"
 	depends on ARCH_K3 || COMPILE_TEST
 	depends on OF
-	select PCIE_CADENCE_HOST
 	select PCI_J721E
 	help
 	  Say Y here if you want to support the TI J721E PCIe platform
@@ -57,11 +58,10 @@ config PCI_J721E_HOST
 	  core.

 config PCI_J721E_EP
-	bool "TI J721E PCIe controller (endpoint mode)"
+	tristate "TI J721E PCIe controller (endpoint mode)"
 	depends on ARCH_K3 || COMPILE_TEST
 	depends on OF
 	depends on PCI_ENDPOINT
-	select PCIE_CADENCE_EP
 	select PCI_J721E
 	help
 	  Say Y here if you want to support the TI J721E PCIe platform
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -15,6 +15,7 @@
 #include <linux/irqchip/chained_irq.h>
 #include <linux/irqdomain.h>
 #include <linux/mfd/syscon.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
@@ -27,6 +28,7 @@
 #define cdns_pcie_to_rc(p) container_of(p, struct cdns_pcie_rc, pcie)

 #define ENABLE_REG_SYS_2	0x108
+#define ENABLE_CLR_REG_SYS_2	0x308
 #define STATUS_REG_SYS_2	0x508
 #define STATUS_CLR_REG_SYS_2	0x708
 #define LINK_DOWN		BIT(1)
@@ -116,6 +118,15 @@ static irqreturn_t j721e_pcie_link_irq_handler(int irq, void *priv)
 	return IRQ_HANDLED;
 }

+static void j721e_pcie_disable_link_irq(struct j721e_pcie *pcie)
+{
+	u32 reg;
+
+	reg = j721e_pcie_intd_readl(pcie, ENABLE_CLR_REG_SYS_2);
+	reg |= pcie->linkdown_irq_regfield;
+	j721e_pcie_intd_writel(pcie, ENABLE_CLR_REG_SYS_2, reg);
+}
+
 static void j721e_pcie_config_link_irq(struct j721e_pcie *pcie)
 {
 	u32 reg;
@@ -464,7 +475,7 @@ static int j721e_pcie_probe(struct platform_device *pdev)

 	switch (mode) {
 	case PCI_MODE_RC:
-		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_HOST))
+		if (!IS_ENABLED(CONFIG_PCI_J721E_HOST))
 			return -ENODEV;

 		bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
@@ -483,7 +494,7 @@ static int j721e_pcie_probe(struct platform_device *pdev)
 		pcie->cdns_pcie = cdns_pcie;
 		break;
 	case PCI_MODE_EP:
-		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_EP))
+		if (!IS_ENABLED(CONFIG_PCI_J721E_EP))
 			return -ENODEV;

 		ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
@@ -633,9 +644,22 @@ static void j721e_pcie_remove(struct platform_device *pdev)
 	struct j721e_pcie *pcie = platform_get_drvdata(pdev);
 	struct cdns_pcie *cdns_pcie = pcie->cdns_pcie;
 	struct device *dev = &pdev->dev;
+	struct cdns_pcie_ep *ep;
+	struct cdns_pcie_rc *rc;
+
+	if (pcie->mode == PCI_MODE_RC) {
+		rc = container_of(cdns_pcie, struct cdns_pcie_rc, pcie);
+		cdns_pcie_host_disable(rc);
+	} else {
+		ep = container_of(cdns_pcie, struct cdns_pcie_ep, pcie);
+		cdns_pcie_ep_disable(ep);
+	}
+
+	gpiod_set_value_cansleep(pcie->reset_gpio, 0);

 	clk_disable_unprepare(pcie->refclk);
 	cdns_pcie_disable_phy(cdns_pcie);
+	j721e_pcie_disable_link_irq(pcie);
 	pm_runtime_put(dev);
 	pm_runtime_disable(dev);
 }
@@ -730,4 +754,8 @@ static struct platform_driver j721e_pcie_driver = {
 		.pm	= pm_sleep_ptr(&j721e_pcie_pm_ops),
 	},
 };
-builtin_platform_driver(j721e_pcie_driver);
+module_platform_driver(j721e_pcie_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PCIe controller driver for TI's J721E and related SoCs");
+MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
--- a/drivers/pci/controller/cadence/pcie-cadence-ep.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c
@@ -6,12 +6,14 @@
 #include <linux/bitfield.h>
 #include <linux/delay.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/pci-epc.h>
 #include <linux/platform_device.h>
 #include <linux/sizes.h>

 #include "pcie-cadence.h"
+#include "../../pci.h"

 #define CDNS_PCIE_EP_MIN_APERTURE		128	/* 128 bytes */
 #define CDNS_PCIE_EP_IRQ_PCI_ADDR_NONE		0x1
@@ -337,10 +339,10 @@ static void cdns_pcie_ep_assert_intx(struct cdns_pcie_ep *ep, u8 fn, u8 intx,

 	if (is_asserted) {
 		ep->irq_pending |= BIT(intx);
-		msg_code = MSG_CODE_ASSERT_INTA + intx;
+		msg_code = PCIE_MSG_CODE_ASSERT_INTA + intx;
 	} else {
 		ep->irq_pending &= ~BIT(intx);
-		msg_code = MSG_CODE_DEASSERT_INTA + intx;
+		msg_code = PCIE_MSG_CODE_DEASSERT_INTA + intx;
 	}

 	spin_lock_irqsave(&ep->lock, flags);
@@ -644,6 +646,17 @@ static const struct pci_epc_ops cdns_pcie_epc_ops = {
 	.get_features	= cdns_pcie_ep_get_features,
 };

+void cdns_pcie_ep_disable(struct cdns_pcie_ep *ep)
+{
+	struct device *dev = ep->pcie.dev;
+	struct pci_epc *epc = to_pci_epc(dev);
+
+	pci_epc_deinit_notify(epc);
+	pci_epc_mem_free_addr(epc, ep->irq_phys_addr, ep->irq_cpu_addr,
+			      SZ_128K);
+	pci_epc_mem_exit(epc);
+}
+EXPORT_SYMBOL_GPL(cdns_pcie_ep_disable);

 int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep)
 {
@@ -751,3 +764,8 @@ int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep)

 	return ret;
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_ep_setup);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cadence PCIe endpoint controller driver");
+MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@free-electrons.com>");
--- a/drivers/pci/controller/cadence/pcie-cadence-host.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
@@ -5,6 +5,7 @@

 #include <linux/delay.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/list_sort.h>
 #include <linux/of_address.h>
 #include <linux/of_pci.h>
@@ -72,6 +73,7 @@ void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,

 	return rc->cfg_base + (where & 0xfff);
 }
+EXPORT_SYMBOL_GPL(cdns_pci_map_bus);

 static struct pci_ops cdns_pcie_host_ops = {
 	.map_bus	= cdns_pci_map_bus,
@@ -150,6 +152,14 @@ static int cdns_pcie_retrain(struct cdns_pcie *pcie)
 	return ret;
 }

+static void cdns_pcie_host_disable_ptm_response(struct cdns_pcie *pcie)
+{
+	u32 val;
+
+	val = cdns_pcie_readl(pcie, CDNS_PCIE_LM_PTM_CTRL);
+	cdns_pcie_writel(pcie, CDNS_PCIE_LM_PTM_CTRL, val & ~CDNS_PCIE_LM_TPM_CTRL_PTMRSEN);
+}
+
 static void cdns_pcie_host_enable_ptm_response(struct cdns_pcie *pcie)
 {
 	u32 val;
@@ -175,6 +185,26 @@ static int cdns_pcie_host_start_link(struct cdns_pcie_rc *rc)
 	return ret;
 }

+static void cdns_pcie_host_deinit_root_port(struct cdns_pcie_rc *rc)
+{
+	struct cdns_pcie *pcie = &rc->pcie;
+	u32 value, ctrl;
+
+	cdns_pcie_rp_writew(pcie, PCI_CLASS_DEVICE, 0xffff);
+	cdns_pcie_rp_writeb(pcie, PCI_CLASS_PROG, 0xff);
+	cdns_pcie_rp_writeb(pcie, PCI_CLASS_REVISION, 0xff);
+	cdns_pcie_writel(pcie, CDNS_PCIE_LM_ID, 0xffffffff);
+	cdns_pcie_rp_writew(pcie, PCI_DEVICE_ID, 0xffff);
+	ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_DISABLED;
+	value = ~(CDNS_PCIE_LM_RC_BAR_CFG_BAR0_CTRL(ctrl) |
+		CDNS_PCIE_LM_RC_BAR_CFG_BAR1_CTRL(ctrl) |
+		CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_ENABLE |
+		CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_64BITS |
+		CDNS_PCIE_LM_RC_BAR_CFG_IO_ENABLE |
+		CDNS_PCIE_LM_RC_BAR_CFG_IO_32BITS);
+	cdns_pcie_writel(pcie, CDNS_PCIE_LM_RC_BAR_CFG, value);
+}
+
 static int cdns_pcie_host_init_root_port(struct cdns_pcie_rc *rc)
 {
 	struct cdns_pcie *pcie = &rc->pcie;
@@ -391,6 +421,32 @@ static int cdns_pcie_host_dma_ranges_cmp(void *priv, const struct list_head *a,
        return resource_size(entry2->res) - resource_size(entry1->res);
 }

+static void cdns_pcie_host_unmap_dma_ranges(struct cdns_pcie_rc *rc)
+{
+	struct cdns_pcie *pcie = &rc->pcie;
+	enum cdns_pcie_rp_bar bar;
+	u32 value;
+
+	/* Reset inbound configuration for all BARs which were being used */
+	for (bar = RP_BAR0; bar <= RP_NO_BAR; bar++) {
+		if (rc->avail_ib_bar[bar])
+			continue;
+
+		cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_RP_BAR_ADDR0(bar), 0);
+		cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_RP_BAR_ADDR1(bar), 0);
+
+		if (bar == RP_NO_BAR)
+			continue;
+
+		value = ~(LM_RC_BAR_CFG_CTRL_MEM_64BITS(bar) |
+			  LM_RC_BAR_CFG_CTRL_PREF_MEM_64BITS(bar) |
+			  LM_RC_BAR_CFG_CTRL_MEM_32BITS(bar) |
+			  LM_RC_BAR_CFG_CTRL_PREF_MEM_32BITS(bar) |
+			  LM_RC_BAR_CFG_APERTURE(bar, bar_aperture_mask[bar] + 2));
+		cdns_pcie_writel(pcie, CDNS_PCIE_LM_RC_BAR_CFG, value);
+	}
+}
+
 static int cdns_pcie_host_map_dma_ranges(struct cdns_pcie_rc *rc)
 {
 	struct cdns_pcie *pcie = &rc->pcie;
@@ -428,6 +484,29 @@ static int cdns_pcie_host_map_dma_ranges(struct cdns_pcie_rc *rc)
 	return 0;
 }

+static void cdns_pcie_host_deinit_address_translation(struct cdns_pcie_rc *rc)
+{
+	struct cdns_pcie *pcie = &rc->pcie;
+	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rc);
+	struct resource_entry *entry;
+	int r;
+
+	cdns_pcie_host_unmap_dma_ranges(rc);
+
+	/*
+	 * Reset outbound region 0 which was reserved for configuration space
+	 * accesses.
+	 */
+	cdns_pcie_reset_outbound_region(pcie, 0);
+
+	/* Reset rest of the outbound regions */
+	r = 1;
+	resource_list_for_each_entry(entry, &bridge->windows) {
+		cdns_pcie_reset_outbound_region(pcie, r);
+		r++;
+	}
+}
+
 static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
 {
 	struct cdns_pcie *pcie = &rc->pcie;
@@ -485,6 +564,12 @@ static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
 	return cdns_pcie_host_map_dma_ranges(rc);
 }

+static void cdns_pcie_host_deinit(struct cdns_pcie_rc *rc)
+{
+	cdns_pcie_host_deinit_address_translation(rc);
+	cdns_pcie_host_deinit_root_port(rc);
+}
+
 int cdns_pcie_host_init(struct cdns_pcie_rc *rc)
 {
 	int err;
@@ -495,6 +580,15 @@ int cdns_pcie_host_init(struct cdns_pcie_rc *rc)

 	return cdns_pcie_host_init_address_translation(rc);
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_host_init);
+
+static void cdns_pcie_host_link_disable(struct cdns_pcie_rc *rc)
+{
+	struct cdns_pcie *pcie = &rc->pcie;
+
+	cdns_pcie_stop_link(pcie);
+	cdns_pcie_host_disable_ptm_response(pcie);
+}

 int cdns_pcie_host_link_setup(struct cdns_pcie_rc *rc)
 {
@@ -519,6 +613,20 @@ int cdns_pcie_host_link_setup(struct cdns_pcie_rc *rc)

 	return 0;
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_host_link_setup);
+
+void cdns_pcie_host_disable(struct cdns_pcie_rc *rc)
+{
+	struct pci_host_bridge *bridge;
+
+	bridge = pci_host_bridge_from_priv(rc);
+	pci_stop_root_bus(bridge->bus);
+	pci_remove_root_bus(bridge->bus);
+
+	cdns_pcie_host_deinit(rc);
+	cdns_pcie_host_link_disable(rc);
+}
+EXPORT_SYMBOL_GPL(cdns_pcie_host_disable);

 int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
 {
@@ -570,14 +678,10 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
 	if (!bridge->ops)
 		bridge->ops = &cdns_pcie_host_ops;

-	ret = pci_host_probe(bridge);
-	if (ret < 0)
-		goto err_init;
-
-	return 0;
-
- err_init:
-	pm_runtime_put_sync(dev);
-
-	return ret;
+	return pci_host_probe(bridge);
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_host_setup);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cadence PCIe host controller driver");
+MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@free-electrons.com>");
--- a/drivers/pci/controller/cadence/pcie-cadence.c
+++ b/drivers/pci/controller/cadence/pcie-cadence.c
@@ -4,6 +4,7 @@
 // Author: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>

 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/of.h>

 #include "pcie-cadence.h"
@@ -23,6 +24,7 @@ void cdns_pcie_detect_quiet_min_delay_set(struct cdns_pcie *pcie)

 	cdns_pcie_writel(pcie, CDNS_PCIE_LTSSM_CONTROL_CAP, ltssm_control_cap);
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_detect_quiet_min_delay_set);

 void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u8 busnr, u8 fn,
 				   u32 r, bool is_io,
@@ -100,6 +102,7 @@ void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u8 busnr, u8 fn,
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), addr0);
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), addr1);
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_set_outbound_region);

 void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie,
 						  u8 busnr, u8 fn,
@@ -134,6 +137,7 @@ void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie,
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), addr0);
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), addr1);
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_set_outbound_region_for_normal_msg);

 void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r)
 {
@@ -146,6 +150,7 @@ void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r)
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), 0);
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), 0);
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_reset_outbound_region);

 void cdns_pcie_disable_phy(struct cdns_pcie *pcie)
 {
@@ -156,6 +161,7 @@ void cdns_pcie_disable_phy(struct cdns_pcie *pcie)
 		phy_exit(pcie->phy[i]);
 	}
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_disable_phy);

 int cdns_pcie_enable_phy(struct cdns_pcie *pcie)
 {
@@ -184,6 +190,7 @@ int cdns_pcie_enable_phy(struct cdns_pcie *pcie)

 	return ret;
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_enable_phy);

 int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie)
 {
@@ -243,6 +250,7 @@ int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie)

 	return ret;
 }
+EXPORT_SYMBOL_GPL(cdns_pcie_init_phy);

 static int cdns_pcie_suspend_noirq(struct device *dev)
 {
@@ -271,3 +279,7 @@ const struct dev_pm_ops cdns_pcie_pm_ops = {
 	NOIRQ_SYSTEM_SLEEP_PM_OPS(cdns_pcie_suspend_noirq,
 				  cdns_pcie_resume_noirq)
 };
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cadence PCIe controller driver");
+MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@free-electrons.com>");
--- a/drivers/pci/controller/cadence/pcie-cadence.h
+++ b/drivers/pci/controller/cadence/pcie-cadence.h
@@ -250,17 +250,6 @@ struct cdns_pcie_rp_ib_bar {

 struct cdns_pcie;

-enum cdns_pcie_msg_code {
-	MSG_CODE_ASSERT_INTA	= 0x20,
-	MSG_CODE_ASSERT_INTB	= 0x21,
-	MSG_CODE_ASSERT_INTC	= 0x22,
-	MSG_CODE_ASSERT_INTD	= 0x23,
-	MSG_CODE_DEASSERT_INTA	= 0x24,
-	MSG_CODE_DEASSERT_INTB	= 0x25,
-	MSG_CODE_DEASSERT_INTC	= 0x26,
-	MSG_CODE_DEASSERT_INTD	= 0x27,
-};
-
 enum cdns_pcie_msg_routing {
 	/* Route to Root Complex */
 	MSG_ROUTING_TO_RC,
@@ -519,10 +508,11 @@ static inline bool cdns_pcie_link_up(struct cdns_pcie *pcie)
 	return true;
 }

-#ifdef CONFIG_PCIE_CADENCE_HOST
+#if IS_ENABLED(CONFIG_PCIE_CADENCE_HOST)
 int cdns_pcie_host_link_setup(struct cdns_pcie_rc *rc);
 int cdns_pcie_host_init(struct cdns_pcie_rc *rc);
 int cdns_pcie_host_setup(struct cdns_pcie_rc *rc);
+void cdns_pcie_host_disable(struct cdns_pcie_rc *rc);
 void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
 			       int where);
 #else
@@ -541,6 +531,10 @@ static inline int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
 	return 0;
 }

+static inline void cdns_pcie_host_disable(struct cdns_pcie_rc *rc)
+{
+}
+
 static inline void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
 					     int where)
 {
@@ -548,13 +542,18 @@ static inline void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int d
 }
 #endif

-#ifdef CONFIG_PCIE_CADENCE_EP
+#if IS_ENABLED(CONFIG_PCIE_CADENCE_EP)
 int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep);
+void cdns_pcie_ep_disable(struct cdns_pcie_ep *ep);
 #else
 static inline int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep)
 {
 	return 0;
 }
+
+static inline void cdns_pcie_ep_disable(struct cdns_pcie_ep *ep)
+{
+}
 #endif

 void cdns_pcie_detect_quiet_min_delay_set(struct cdns_pcie *pcie);