[PATCH 1/6] PCI: mobiveil: Add the EP driver support

[Xiaowei Bao <xiaowei.bao@nxp.com>]

Add the EP driver support for Mobiveil base on endpoint framework.

Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
---
 MAINTAINERS                                        |   1 +
 drivers/pci/controller/mobiveil/Kconfig            |   5 +
 drivers/pci/controller/mobiveil/Makefile           |   1 +
 drivers/pci/controller/mobiveil/pcie-mobiveil-ep.c | 568 +++++++++++++++++++++
 drivers/pci/controller/mobiveil/pcie-mobiveil.c    |  99 +++-
 drivers/pci/controller/mobiveil/pcie-mobiveil.h    |  68 +++
 6 files changed, 734 insertions(+), 8 deletions(-)
 create mode 100644 drivers/pci/controller/mobiveil/pcie-mobiveil-ep.c

diff --git a/MAINTAINERS b/MAINTAINERS
index e6a4de0..b997056 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12409,6 +12409,7 @@ F:	drivers/ntb/hw/mscc/
 PCI DRIVER FOR MOBIVEIL PCIE IP
 M:	Karthikeyan Mitran <m.karthikeyan@mobiveil.co.in>
 M:	Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
+M:	Xiaowei Bao <xiaowei.bao@nxp.com>
 L:	linux-pci@vger.kernel.org
 S:	Supported
 F:	Documentation/devicetree/bindings/pci/mobiveil-pcie.txt
diff --git a/drivers/pci/controller/mobiveil/Kconfig b/drivers/pci/controller/mobiveil/Kconfig
index c823be8..2054950 100644
--- a/drivers/pci/controller/mobiveil/Kconfig
+++ b/drivers/pci/controller/mobiveil/Kconfig
@@ -11,6 +11,11 @@ config PCIE_MOBIVEIL_HOST
 	depends on PCI_MSI_IRQ_DOMAIN
         select PCIE_MOBIVEIL
 
+config PCIE_MOBIVEIL_EP
+	bool
+	depends on PCI_ENDPOINT
+	select PCIE_MOBIVEIL
+
 config PCIE_MOBIVEIL_PLAT
 	bool "Mobiveil AXI PCIe controller"
 	depends on ARCH_ZYNQMP || COMPILE_TEST
diff --git a/drivers/pci/controller/mobiveil/Makefile b/drivers/pci/controller/mobiveil/Makefile
index 99d879d..686d41f 100644
--- a/drivers/pci/controller/mobiveil/Makefile
+++ b/drivers/pci/controller/mobiveil/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_PCIE_MOBIVEIL) += pcie-mobiveil.o
 obj-$(CONFIG_PCIE_MOBIVEIL_HOST) += pcie-mobiveil-host.o
+obj-$(CONFIG_PCIE_MOBIVEIL_EP) += pcie-mobiveil-ep.o
 obj-$(CONFIG_PCIE_MOBIVEIL_PLAT) += pcie-mobiveil-plat.o
 obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4) += pcie-layerscape-gen4.o
diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-ep.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-ep.c
new file mode 100644
index 0000000..6e558dd
--- /dev/null
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-ep.c
@@ -0,0 +1,568 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Mobiveil PCIe Endpoint controller driver
+ *
+ * Copyright (C) 2019 NXP Semiconductor.
+ * Author: Xiaowei Bao <xiaowei.bao@nxp.com>
+ */
+
+#include <linux/of.h>
+#include <linux/pci-epc.h>
+#include <linux/pci-epf.h>
+#include <linux/platform_device.h>
+#include "pcie-mobiveil.h"
+
+static void mobiveil_pcie_ep_func_select(struct mobiveil_pcie *pcie, u8 func_no)
+{
+	u32 func_num;
+
+	/*
+	 * select to access the config space of func_no by setting func_no
+	 * to FUNC_SEL_SHIFT bit of PAB_CTRL register.
+	 */
+	func_num = csr_readl(pcie, PAB_CTRL);
+	func_num &= ~(FUNC_SEL_MASK << FUNC_SEL_SHIFT);
+	func_num |= (func_no & FUNC_SEL_MASK) << FUNC_SEL_SHIFT;
+	csr_writel(pcie, func_num, PAB_CTRL);
+}
+
+static void mobiveil_pcie_ep_func_deselect(struct mobiveil_pcie *pcie)
+{
+	u32 func_num;
+
+	/*
+	 * clear the FUNC_SEL_SHIFT bits when access other registers except
+	 * config space register.
+	 */
+	func_num = csr_readl(pcie, PAB_CTRL);
+	func_num &= ~(FUNC_SEL_MASK << FUNC_SEL_SHIFT);
+	csr_writel(pcie, func_num, PAB_CTRL);
+}
+
+static void __mobiveil_pcie_ep_reset_bar(struct mobiveil_pcie *pcie, u8 bar)
+{
+	csr_writel(pcie, bar, GPEX_BAR_SELECT);
+	csr_writel(pcie, 0, GPEX_BAR_SIZE_LDW);
+	csr_writel(pcie, 0, GPEX_BAR_SIZE_UDW);
+}
+
+void mobiveil_pcie_ep_reset_bar(struct mobiveil_pcie *pcie, u8 bar)
+{
+	__mobiveil_pcie_ep_reset_bar(pcie, bar);
+}
+
+static u8 __mobiveil_pcie_ep_find_next_cap(struct mobiveil_pcie *pcie,
+					   u8 func_no, u8 cap_ptr, u8 cap)
+{
+	u8 cap_id, next_cap_ptr;
+	u16 reg;
+
+	if (!cap_ptr)
+		return 0;
+
+	mobiveil_pcie_ep_func_select(pcie, func_no);
+
+	reg = csr_readw(pcie, cap_ptr);
+	cap_id = (reg & 0x00ff);
+
+	mobiveil_pcie_ep_func_deselect(pcie);
+
+	if (cap_id > PCI_CAP_ID_MAX)
+		return 0;
+
+	if (cap_id == cap)
+		return cap_ptr;
+
+	next_cap_ptr = (reg & 0xff00) >> 8;
+	return __mobiveil_pcie_ep_find_next_cap(pcie, func_no,
+						next_cap_ptr, cap);
+}
+
+static u8 mobiveil_pcie_ep_find_capability(struct mobiveil_pcie_ep *ep,
+					   u8 func_no, u8 cap)
+{
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	u8 next_cap_ptr;
+	u16 reg;
+
+	mobiveil_pcie_ep_func_select(pcie, func_no);
+
+	reg = csr_readw(pcie, PCI_CAPABILITY_LIST);
+	next_cap_ptr = (reg & 0x00ff);
+
+	mobiveil_pcie_ep_func_deselect(pcie);
+
+	return __mobiveil_pcie_ep_find_next_cap(pcie, func_no,
+						next_cap_ptr, cap);
+}
+
+static int mobiveil_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
+					 struct pci_epf_header *hdr)
+{
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+
+	mobiveil_pcie_ep_func_select(pcie, func_no);
+
+	csr_writew(pcie, hdr->vendorid, PCI_VENDOR_ID);
+	csr_writew(pcie, hdr->deviceid, PCI_DEVICE_ID);
+	csr_writeb(pcie, hdr->revid, PCI_REVISION_ID);
+	csr_writeb(pcie, hdr->progif_code, PCI_CLASS_PROG);
+	csr_writew(pcie, hdr->subclass_code | hdr->baseclass_code << 8,
+		   PCI_CLASS_DEVICE);
+	csr_writeb(pcie, hdr->cache_line_size, PCI_CACHE_LINE_SIZE);
+	csr_writew(pcie, hdr->subsys_vendor_id, PCI_SUBSYSTEM_VENDOR_ID);
+	csr_writew(pcie, hdr->subsys_id, PCI_SUBSYSTEM_ID);
+	csr_writeb(pcie, hdr->interrupt_pin, PCI_INTERRUPT_PIN);
+
+	mobiveil_pcie_ep_func_deselect(pcie);
+
+	return 0;
+}
+
+static void mobiveil_pcie_ep_inbound_win(struct mobiveil_pcie_ep *ep,
+					 u8 func_no, enum pci_barno bar,
+					 dma_addr_t cpu_addr)
+{
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+
+	program_ib_windows_ep(pcie, func_no, bar, cpu_addr);
+}
+
+static int mobiveil_pcie_ep_outbound_win(struct mobiveil_pcie_ep *ep,
+					 phys_addr_t phys_addr,
+					 u64 pci_addr, u8 func_no,
+					 size_t size)
+{
+	u32 free_win;
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+
+	free_win = find_first_zero_bit(ep->apio_wins_map, ep->apio_wins);
+	if (free_win >= ep->apio_wins) {
+		dev_err(&pcie->pdev->dev, "No free outbound window\n");
+		return -EINVAL;
+	}
+
+	program_ob_windows_ep(pcie, func_no, free_win, phys_addr,
+			      pci_addr, MEM_WINDOW_TYPE, size);
+
+	set_bit(free_win, ep->apio_wins_map);
+	ep->apio_addr[free_win] = phys_addr;
+
+	return 0;
+}
+
+static void mobiveil_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
+				       struct pci_epf_bar *epf_bar)
+{
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	enum pci_barno bar = epf_bar->barno;
+
+	if (bar < ep->bar_num) {
+		__mobiveil_pcie_ep_reset_bar(pcie, func_no * ep->bar_num + bar);
+
+		mobiveil_pcie_disable_ib_win_ep(pcie, func_no, bar);
+	}
+}
+
+static int mobiveil_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
+				    struct pci_epf_bar *epf_bar)
+{
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	enum pci_barno bar = epf_bar->barno;
+	size_t size = epf_bar->size;
+
+	if (bar < ep->bar_num) {
+		mobiveil_pcie_ep_inbound_win(ep, func_no, bar,
+					     epf_bar->phys_addr);
+
+		csr_writel(pcie, func_no * ep->bar_num + bar,
+			   GPEX_BAR_SELECT);
+		csr_writel(pcie, lower_32_bits(~(size - 1)),
+			   GPEX_BAR_SIZE_LDW);
+		csr_writel(pcie, upper_32_bits(~(size - 1)),
+			   GPEX_BAR_SIZE_UDW);
+	}
+
+	return 0;
+}
+
+static int mobiveil_pcie_find_index(struct mobiveil_pcie_ep *ep,
+				    phys_addr_t addr,
+				    u32 *atu_index)
+{
+	u32 index;
+
+	for (index = 0; index < ep->apio_wins; index++) {
+		if (ep->apio_addr[index] != addr)
+			continue;
+		*atu_index = index;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static void mobiveil_pcie_ep_unmap_addr(struct pci_epc *epc, u8 func_no,
+					phys_addr_t addr)
+{
+	int ret;
+	u32 atu_index;
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+
+	ret = mobiveil_pcie_find_index(ep, addr, &atu_index);
+	if (ret < 0)
+		return;
+
+	mobiveil_pcie_disable_ob_win(pcie, atu_index);
+	clear_bit(atu_index, ep->apio_wins_map);
+}
+
+static int mobiveil_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no,
+				     phys_addr_t addr,
+				     u64 pci_addr, size_t size)
+{
+	int ret;
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+
+	ret = mobiveil_pcie_ep_outbound_win(ep, addr, pci_addr, func_no, size);
+	if (ret) {
+		dev_err(&pcie->pdev->dev, "Failed to enable address\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int mobiveil_pcie_ep_get_msi(struct pci_epc *epc, u8 func_no)
+{
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	u32 val, reg;
+	u8 msi_cap;
+
+	msi_cap = mobiveil_pcie_ep_find_capability(ep, func_no,
+						   PCI_CAP_ID_MSI);
+	if (!msi_cap)
+		return -EINVAL;
+
+	mobiveil_pcie_ep_func_select(pcie, func_no);
+
+	reg = msi_cap + PCI_MSI_FLAGS;
+	val = csr_readw(pcie, reg);
+
+	mobiveil_pcie_ep_func_deselect(pcie);
+
+	if (!(val & PCI_MSI_FLAGS_ENABLE))
+		return -EINVAL;
+
+	val = (val & PCI_MSI_FLAGS_QSIZE) >> 4;
+
+	return val;
+}
+
+static int mobiveil_pcie_ep_set_msi(struct pci_epc *epc,
+				    u8 func_no, u8 interrupts)
+{
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	u32 val, reg;
+	u8 msi_cap;
+
+	msi_cap = mobiveil_pcie_ep_find_capability(ep, func_no,
+						   PCI_CAP_ID_MSI);
+	if (!msi_cap)
+		return -EINVAL;
+
+	mobiveil_pcie_ep_func_select(pcie, func_no);
+
+	reg = msi_cap + PCI_MSI_FLAGS;
+	val = csr_readw(pcie, reg);
+	val &= ~PCI_MSI_FLAGS_QMASK;
+	val |= (interrupts << 1) & PCI_MSI_FLAGS_QMASK;
+	csr_writew(pcie, val, reg);
+
+	mobiveil_pcie_ep_func_deselect(pcie);
+
+	return 0;
+}
+
+static int mobiveil_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no)
+{
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	u32 val, reg;
+	u8 msix_cap;
+
+	msix_cap = mobiveil_pcie_ep_find_capability(ep, func_no,
+						    PCI_CAP_ID_MSIX);
+	if (!msix_cap)
+		return -EINVAL;
+
+	mobiveil_pcie_ep_func_select(pcie, func_no);
+
+	reg = msix_cap + PCI_MSIX_FLAGS;
+	val = csr_readw(pcie, reg);
+
+	mobiveil_pcie_ep_func_deselect(pcie);
+
+	if (!(val & PCI_MSIX_FLAGS_ENABLE))
+		return -EINVAL;
+
+	val &= PCI_MSIX_FLAGS_QSIZE;
+
+	return val;
+}
+
+static int mobiveil_pcie_ep_set_msix(struct pci_epc *epc, u8 func_no,
+				     u16 interrupts)
+{
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	u32 val, reg;
+	u8 msix_cap;
+
+	msix_cap = mobiveil_pcie_ep_find_capability(ep, func_no,
+						    PCI_CAP_ID_MSIX);
+	if (!msix_cap)
+		return -EINVAL;
+
+	mobiveil_pcie_ep_func_select(pcie, func_no);
+
+	reg = msix_cap + PCI_MSIX_FLAGS;
+	val = csr_readw(pcie, reg);
+	val &= ~PCI_MSIX_FLAGS_QSIZE;
+	val |= interrupts;
+	csr_writew(pcie, val, reg);
+
+	mobiveil_pcie_ep_func_deselect(pcie);
+
+	return 0;
+}
+
+static int mobiveil_pcie_ep_raise_irq(struct pci_epc *epc, u8 func_no,
+				      enum pci_epc_irq_type type,
+				      u16 interrupt_num)
+{
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+
+	if (!ep->ops->raise_irq)
+		return -EINVAL;
+
+	return ep->ops->raise_irq(ep, func_no, type, interrupt_num);
+}
+
+static const struct pci_epc_features*
+mobiveil_pcie_ep_get_features(struct pci_epc *epc, u8 func_no)
+{
+	struct mobiveil_pcie_ep *ep = epc_get_drvdata(epc);
+
+	if (!ep->ops->get_features)
+		return NULL;
+
+	return ep->ops->get_features(ep);
+}
+
+static const struct pci_epc_ops epc_ops = {
+	.write_header		= mobiveil_pcie_ep_write_header,
+	.set_bar		= mobiveil_pcie_ep_set_bar,
+	.clear_bar		= mobiveil_pcie_ep_clear_bar,
+	.map_addr		= mobiveil_pcie_ep_map_addr,
+	.unmap_addr		= mobiveil_pcie_ep_unmap_addr,
+	.set_msi		= mobiveil_pcie_ep_set_msi,
+	.get_msi		= mobiveil_pcie_ep_get_msi,
+	.set_msix		= mobiveil_pcie_ep_set_msix,
+	.get_msix		= mobiveil_pcie_ep_get_msix,
+	.raise_irq		= mobiveil_pcie_ep_raise_irq,
+	.get_features		= mobiveil_pcie_ep_get_features,
+};
+
+int mobiveil_pcie_ep_raise_legacy_irq(struct mobiveil_pcie_ep *ep, u8 func_no)
+{
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+
+	dev_err(&pcie->pdev->dev, "EP cannot trigger legacy IRQs\n");
+
+	return -EINVAL;
+}
+
+int mobiveil_pcie_ep_raise_msi_irq(struct mobiveil_pcie_ep *ep, u8 func_no,
+				   u8 interrupt_num)
+{
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	struct pci_epc *epc = ep->epc;
+	u16 msg_ctrl, msg_data;
+	u32 msg_addr_lower, msg_addr_upper, reg;
+	u64 msg_addr;
+	bool has_upper;
+	int ret;
+	u8 msi_cap;
+
+	msi_cap = mobiveil_pcie_ep_find_capability(ep, func_no,
+						   PCI_CAP_ID_MSI);
+	if (!msi_cap)
+		return -EINVAL;
+
+	mobiveil_pcie_ep_func_select(pcie, func_no);
+
+	reg = msi_cap + PCI_MSI_FLAGS;
+	msg_ctrl = csr_readw(pcie, reg);
+	has_upper = !!(msg_ctrl & PCI_MSI_FLAGS_64BIT);
+	reg = msi_cap + PCI_MSI_ADDRESS_LO;
+	msg_addr_lower = csr_readl(pcie, reg);
+	if (has_upper) {
+		reg = msi_cap + PCI_MSI_ADDRESS_HI;
+		msg_addr_upper = csr_readl(pcie, reg);
+		reg = msi_cap + PCI_MSI_DATA_64;
+		msg_data = csr_readw(pcie, reg);
+	} else {
+		msg_addr_upper = 0;
+		reg = msi_cap + PCI_MSI_DATA_32;
+		msg_data = csr_readw(pcie, reg);
+	}
+	msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower;
+
+	mobiveil_pcie_ep_func_deselect(pcie);
+
+	ret = mobiveil_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys,
+					msg_addr, epc->mem->page_size);
+	if (ret)
+		return ret;
+
+	writel(msg_data | (interrupt_num - 1), ep->msi_mem);
+
+	mobiveil_pcie_ep_unmap_addr(epc, func_no, ep->msi_mem_phys);
+
+	return 0;
+}
+
+int mobiveil_pcie_ep_raise_msix_irq(struct mobiveil_pcie_ep *ep, u8 func_no,
+				    u16 interrupt_num)
+{
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	struct pci_epc *epc = ep->epc;
+	u32 msg_addr_upper, msg_addr_lower;
+	u32 msg_data;
+	u64 msg_addr;
+	u8 msix_cap;
+	int ret;
+
+	msix_cap = mobiveil_pcie_ep_find_capability(ep, func_no,
+						   PCI_CAP_ID_MSIX);
+	if (!msix_cap)
+		return -EINVAL;
+
+	mobiveil_pcie_ep_func_deselect(pcie);
+
+	msg_addr_lower = csr_readl(pcie, PAB_MSIX_TABLE_PBA_ACCESS +
+				   PCI_MSIX_ENTRY_LOWER_ADDR +
+				   (interrupt_num - 1) * PCI_MSIX_ENTRY_SIZE);
+	msg_addr_upper = csr_readl(pcie, PAB_MSIX_TABLE_PBA_ACCESS +
+				   PCI_MSIX_ENTRY_UPPER_ADDR +
+				   (interrupt_num - 1) * PCI_MSIX_ENTRY_SIZE);
+	msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower;
+	msg_data = csr_readl(pcie, PAB_MSIX_TABLE_PBA_ACCESS +
+			     PCI_MSIX_ENTRY_DATA +
+			     (interrupt_num - 1) * PCI_MSIX_ENTRY_SIZE);
+
+	ret = mobiveil_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys,
+					msg_addr, epc->mem->page_size);
+	if (ret)
+		return ret;
+
+	writel(msg_data, ep->msi_mem);
+
+	mobiveil_pcie_ep_unmap_addr(epc, func_no, ep->msi_mem_phys);
+
+	return 0;
+}
+
+void mobiveil_pcie_ep_exit(struct mobiveil_pcie_ep *ep)
+{
+	struct pci_epc *epc = ep->epc;
+
+	pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem,
+			      epc->mem->page_size);
+
+	pci_epc_mem_exit(epc);
+}
+
+int mobiveil_pcie_ep_init(struct mobiveil_pcie_ep *ep)
+{
+	int ret;
+	void *addr;
+	struct pci_epc *epc;
+	struct mobiveil_pcie *pcie = to_mobiveil_pcie_from_ep(ep);
+	struct device *dev = &pcie->pdev->dev;
+	struct device_node *np = dev->of_node;
+
+	if (!pcie->csr_axi_slave_base) {
+		dev_err(dev, "csr_base is not populated\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_u32(np, "apio-wins", &ep->apio_wins);
+	if (ret < 0) {
+		dev_err(dev, "Unable to read apio-wins property\n");
+		return ret;
+	}
+
+	if (ep->apio_wins > MAX_IATU_OUT) {
+		dev_err(dev, "Invalid apio-wins\n");
+		return -EINVAL;
+	}
+	ep->apio_wins_map = devm_kcalloc(dev,
+					 BITS_TO_LONGS(ep->apio_wins),
+					 sizeof(long),
+					 GFP_KERNEL);
+	if (!ep->apio_wins_map)
+		return -ENOMEM;
+
+	addr = devm_kcalloc(dev, ep->apio_wins, sizeof(phys_addr_t),
+			    GFP_KERNEL);
+	if (!addr)
+		return -ENOMEM;
+
+	ep->apio_addr = addr;
+
+	mobiveil_pcie_enable_bridge_pio(pcie);
+	mobiveil_pcie_enable_engine_apio(pcie);
+	mobiveil_pcie_enable_engine_ppio(pcie);
+	mobiveil_pcie_enable_msi_ep(pcie);
+
+	epc = devm_pci_epc_create(dev, &epc_ops);
+	if (IS_ERR(epc)) {
+		dev_err(dev, "Failed to create epc device\n");
+		return PTR_ERR(epc);
+	}
+
+	ep->epc = epc;
+	epc_set_drvdata(epc, ep);
+
+	ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
+	if (ret < 0)
+		epc->max_functions = 1;
+
+	if (ep->ops->ep_init)
+		ep->ops->ep_init(ep);
+
+	ret = __pci_epc_mem_init(epc, ep->phys_base, ep->addr_size,
+				 ep->page_size);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize address space\n");
+		return ret;
+	}
+
+	ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys,
+					     epc->mem->page_size);
+	if (!ep->msi_mem) {
+		dev_err(dev, "Failed to reserve memory for MSI/MSI-X\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.c b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
index 94b23be..6d47164 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil.c
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
@@ -168,18 +168,12 @@ void program_ib_windows(struct mobiveil_pcie *pcie, int win_num, u64 cpu_addr,
 /*
  * routine to program the outbound windows
  */
-void program_ob_windows(struct mobiveil_pcie *pcie, int win_num, u64 cpu_addr,
-			u64 pci_addr, u32 type, u64 size)
+void __program_ob_windows(struct mobiveil_pcie *pcie, u8 func_no, int win_num,
+			  u64 cpu_addr, u64 pci_addr, u32 type, u64 size)
 {
 	u32 value;
 	u64 size64 = ~(size - 1);
 
-	if (win_num >= pcie->apio_wins) {
-		dev_err(&pcie->pdev->dev,
-			"ERROR: max outbound windows reached !\n");
-		return;
-	}
-
 	/*
 	 * program Enable Bit to 1, Type Bit to (00) base 2, AXI Window Size Bit
 	 * to 4 KB in PAB_AXI_AMAP_CTRL register
@@ -192,6 +186,7 @@ void program_ob_windows(struct mobiveil_pcie *pcie, int win_num, u64 cpu_addr,
 
 	csr_writel(pcie, upper_32_bits(size64), PAB_EXT_AXI_AMAP_SIZE(win_num));
 
+	csr_writel(pcie, func_no, PAB_AXI_AMAP_PCI_HDR_PARAM(win_num));
 	/*
 	 * program AXI window base with appropriate value in
 	 * PAB_AXI_AMAP_AXI_WIN0 register
@@ -205,10 +200,98 @@ void program_ob_windows(struct mobiveil_pcie *pcie, int win_num, u64 cpu_addr,
 		   PAB_AXI_AMAP_PEX_WIN_L(win_num));
 	csr_writel(pcie, upper_32_bits(pci_addr),
 		   PAB_AXI_AMAP_PEX_WIN_H(win_num));
+}
+
+void program_ob_windows(struct mobiveil_pcie *pcie, int win_num, u64 cpu_addr,
+			u64 pci_addr, u32 type, u64 size)
+{
+	if (win_num >= pcie->apio_wins) {
+		dev_err(&pcie->pdev->dev,
+			"ERROR: max outbound windows reached !\n");
+		return;
+	}
+
+	__program_ob_windows(pcie, 0, win_num, cpu_addr,
+			     pci_addr, type, size);
 
 	pcie->ob_wins_configured++;
 }
 
+void program_ob_windows_ep(struct mobiveil_pcie *pcie, u8 func_no, int win_num,
+			   u64 cpu_addr, u64 pci_addr, u32 type, u64 size)
+{
+	if (size & (size - 1))
+		size = 1 << (1 + ilog2(size));
+
+	__program_ob_windows(pcie, func_no, win_num, cpu_addr,
+			     pci_addr, type, size);
+}
+
+void program_ib_windows_ep(struct mobiveil_pcie *pcie, u8 func_no,
+			   int bar, u64 phys)
+{
+	csr_writel(pcie, upper_32_bits(phys),
+		   PAB_EXT_PEX_BAR_AMAP(func_no, bar));
+	csr_writel(pcie, lower_32_bits(phys) | PEX_BAR_AMAP_EN,
+		   PAB_PEX_BAR_AMAP(func_no, bar));
+}
+
+void mobiveil_pcie_disable_ib_win_ep(struct mobiveil_pcie *pcie,
+				     u8 func_no, u8 bar)
+{
+	u32 val;
+
+	val = csr_readl(pcie, PAB_PEX_BAR_AMAP(func_no, bar));
+	val &= ~(1 << 0);
+	csr_writel(pcie, val, PAB_PEX_BAR_AMAP(func_no, bar));
+}
+
+void mobiveil_pcie_disable_ob_win(struct mobiveil_pcie *pcie, int win_num)
+{
+	u32 val;
+
+	val = csr_readl(pcie, PAB_AXI_AMAP_CTRL(win_num));
+	val &= ~(1 << WIN_ENABLE_SHIFT);
+	csr_writel(pcie, val, PAB_AXI_AMAP_CTRL(win_num));
+}
+
+void mobiveil_pcie_enable_bridge_pio(struct mobiveil_pcie *pcie)
+{
+	u32 val;
+
+	val = csr_readl(pcie, PAB_CTRL);
+	val |= 1 << AMBA_PIO_ENABLE_SHIFT;
+	val |= 1 << PEX_PIO_ENABLE_SHIFT;
+	csr_writel(pcie, val, PAB_CTRL);
+}
+
+void mobiveil_pcie_enable_engine_apio(struct mobiveil_pcie *pcie)
+{
+	u32 val;
+
+	val = csr_readl(pcie, PAB_AXI_PIO_CTRL);
+	val |= APIO_EN_MASK;
+	csr_writel(pcie, val, PAB_AXI_PIO_CTRL);
+}
+
+void mobiveil_pcie_enable_engine_ppio(struct mobiveil_pcie *pcie)
+{
+	u32 val;
+
+	val = csr_readl(pcie, PAB_PEX_PIO_CTRL);
+	val |= 1 << PIO_ENABLE_SHIFT;
+	csr_writel(pcie, val, PAB_PEX_PIO_CTRL);
+}
+
+void mobiveil_pcie_enable_msi_ep(struct mobiveil_pcie *pcie)
+{
+	u32 val;
+
+	val =  csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
+	val |= PAB_INTP_PAMR;
+	csr_writel(pcie, val, PAB_INTP_AMBA_MISC_ENB);
+}
+
 int mobiveil_bringup_link(struct mobiveil_pcie *pcie)
 {
 	int retries;
diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
index b7e9603..7308fa4 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
@@ -15,8 +15,12 @@
 #include <linux/pci.h>
 #include <linux/irq.h>
 #include <linux/msi.h>
+#include <linux/pci-epc.h>
+#include <linux/pci-epf.h>
+
 #include "../../pci.h"
 
+#define MAX_IATU_OUT			256
 /* register offsets and bit positions */
 
 /*
@@ -42,6 +46,9 @@
 #define  PAGE_SEL_MASK			0x3f
 #define  PAGE_LO_MASK			0x3ff
 #define  PAGE_SEL_OFFSET_SHIFT		10
+#define  FUNC_SEL_SHIFT			19
+#define  FUNC_SEL_MASK			0x1ff
+#define  MSI_SW_CTRL_EN			BIT(29)
 
 #define PAB_ACTIVITY_STAT		0x81c
 
@@ -52,6 +59,7 @@
 #define  PIO_ENABLE_SHIFT		0
 
 #define PAB_INTP_AMBA_MISC_ENB		0x0b0c
+#define  PAB_INTP_PAMR			BIT(0)
 #define PAB_INTP_AMBA_MISC_STAT		0x0b1c
 #define  PAB_INTP_RESET			BIT(1)
 #define  PAB_INTP_MSI			BIT(3)
@@ -72,6 +80,8 @@
 #define  WIN_TYPE_MASK			0x3
 #define  WIN_SIZE_MASK			0xfffffc00
 
+#define PAB_AXI_AMAP_PCI_HDR_PARAM(win)	PAB_EXT_REG_ADDR(0x5ba0, win)
+
 #define PAB_EXT_AXI_AMAP_SIZE(win)	PAB_EXT_REG_ADDR(0xbaf0, win)
 
 #define PAB_EXT_AXI_AMAP_AXI_WIN(win)	PAB_EXT_REG_ADDR(0x80a0, win)
@@ -101,6 +111,18 @@
 #define PAB_PEX_AMAP_PEX_WIN_L(win)	PAB_REG_ADDR(0x4ba8, win)
 #define PAB_PEX_AMAP_PEX_WIN_H(win)	PAB_REG_ADDR(0x4bac, win)
 
+/* PPIO WINs EP mode */
+#define PAB_PEX_BAR_AMAP(func, bar)	(0x1ba0 + 0x20 * func + 4 * bar)
+#define PAB_EXT_PEX_BAR_AMAP(func, bar)	(0x84a0 + 0x20 * func + 4 * bar)
+#define PEX_BAR_AMAP_EN			BIT(0)
+
+#define PAB_MSIX_TABLE_PBA_ACCESS	0xD000
+
+#define GPEX_BAR_ENABLE			0x4D4
+#define GPEX_BAR_SIZE_LDW		0x4D8
+#define GPEX_BAR_SIZE_UDW		0x4DC
+#define GPEX_BAR_SELECT			0x4E0
+
 /* starting offset of INTX bits in status register */
 #define PAB_INTX_START			5
 
@@ -138,6 +160,7 @@
 	((off >> PAGE_SEL_OFFSET_SHIFT) & PAGE_SEL_MASK)
 
 struct mobiveil_pcie;
+struct mobiveil_pcie_ep;
 
 struct mobiveil_msi {			/* MSI information */
 	struct mutex lock;		/* protect bitmap variable */
@@ -170,6 +193,28 @@ struct mobiveil_pab_ops {
 	int (*host_init)(struct mobiveil_pcie *pcie);
 };
 
+struct mobiveil_pcie_ep_ops {
+	void (*ep_init)(struct mobiveil_pcie_ep *ep);
+	int (*raise_irq)(struct mobiveil_pcie_ep *ep, u8 func_no,
+			 enum pci_epc_irq_type type, u16 interrupt_num);
+	const struct pci_epc_features* (*get_features)
+				       (struct mobiveil_pcie_ep *ep);
+};
+
+struct mobiveil_pcie_ep {
+	struct pci_epc *epc;
+	const struct mobiveil_pcie_ep_ops *ops;
+	phys_addr_t phys_base;
+	size_t addr_size;
+	size_t page_size;
+	phys_addr_t *apio_addr;
+	unsigned long *apio_wins_map;
+	u32 apio_wins;
+	void __iomem *msi_mem;
+	phys_addr_t msi_mem_phys;
+	u8 bar_num;
+};
+
 struct mobiveil_pcie {
 	struct platform_device *pdev;
 	struct list_head *resources;
@@ -183,8 +228,12 @@ struct mobiveil_pcie {
 	const struct mobiveil_pab_ops *ops;
 	struct root_port rp;
 	struct pci_host_bridge *bridge;
+	struct mobiveil_pcie_ep ep;
 };
 
+#define to_mobiveil_pcie_from_ep(endpoint)   \
+			    container_of((endpoint), struct mobiveil_pcie, ep)
+
 int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie);
 int mobiveil_host_init(struct mobiveil_pcie *pcie, bool reinit);
 bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie);
@@ -226,4 +275,23 @@ static inline void csr_writeb(struct mobiveil_pcie *pcie, u32 val, u32 off)
 	csr_write(pcie, val, off, 0x1);
 }
 
+void program_ib_windows_ep(struct mobiveil_pcie *pcie, u8 func_no,
+			   int bar, u64 phys);
+void program_ob_windows_ep(struct mobiveil_pcie *pcie, u8 func_num, int win_num,
+			   u64 cpu_addr, u64 pci_addr, u32 type, u64 size);
+void mobiveil_pcie_disable_ib_win_ep(struct mobiveil_pcie *pci,
+				     u8 func_no, u8 bar);
+void mobiveil_pcie_disable_ob_win(struct mobiveil_pcie *pcie, int win_num);
+int mobiveil_pcie_ep_init(struct mobiveil_pcie_ep *ep);
+int mobiveil_pcie_ep_raise_legacy_irq(struct mobiveil_pcie_ep *ep, u8 func_no);
+int mobiveil_pcie_ep_raise_msi_irq(struct mobiveil_pcie_ep *ep, u8 func_no,
+				   u8 interrupt_num);
+int mobiveil_pcie_ep_raise_msix_irq(struct mobiveil_pcie_ep *ep, u8 func_no,
+				    u16 interrupt_num);
+void mobiveil_pcie_ep_reset_bar(struct mobiveil_pcie *pci, u8 bar);
+u8 mobiveil_pcie_ep_get_bar_num(struct mobiveil_pcie_ep *ep, u8 func_no);
+void mobiveil_pcie_enable_bridge_pio(struct mobiveil_pcie *pci);
+void mobiveil_pcie_enable_engine_apio(struct mobiveil_pcie *pci);
+void mobiveil_pcie_enable_engine_ppio(struct mobiveil_pcie *pci);
+void mobiveil_pcie_enable_msi_ep(struct mobiveil_pcie *pci);
 #endif /* _PCIE_MOBIVEIL_H */
-- 
2.9.5