On Mon, Oct 26, 2015 at 9:56 AM, Bharat Kumar Gogada
<bharat.kumar.gogada@xxxxxxxxxx> wrote:
> Adding PCIe Root Port driver for Xilinx PCIe NWL bridge IP.
>
> Signed-off-by: Bharat Kumar Gogada <bharatku@xxxxxxxxxx>
> Signed-off-by: Ravi Kiran Gummaluri <rgummal@xxxxxxxxxx>
> ---
> Corrected device tree node name.
> Made tuples for interrupts, interrupt-map, reg properties.
> Added mutex lock in nwl_irq_domain_free function.
> Removed unneccessary casts.
> ---
> .../devicetree/bindings/pci/xilinx-nwl-pcie.txt | 68 ++
> drivers/pci/host/Kconfig | 9 +
> drivers/pci/host/Makefile | 1 +
> drivers/pci/host/pcie-xilinx-nwl.c | 1057 ++++++++++++++++++++
> 4 files changed, 1135 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt
> create mode 100644 drivers/pci/host/pcie-xilinx-nwl.c
>
> diff --git a/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt b/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt
> new file mode 100644
> index 0000000..432fa1f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt
> @@ -0,0 +1,68 @@
> +* Xilinx NWL PCIe Root Port Bridge DT description
> +
> +Required properties:
> +- compatible: Should contain "xlnx,nwl-pcie-2.11"
> +- #address-cells: Address representation for root ports, set to <3>
> +- #size-cells: Size representation for root ports, set to <2>
> +- #interrupt-cells: specifies the number of cells needed to encode an
> + interrupt source. The value must be 1.
Is this needed since you have the sub-node defining it?
> +- reg: Should contain Bridge, PCIe Controller registers location,
> + configuration sapce, and length
> +- reg-names: Must include the following entries:
> + "breg": bridge registers
> + "pcireg": PCIe controller registers
> + "cfg": configuration space region
> +- device_type: must be "pci"
> +- interrupts: Should contain NWL PCIe interrupt
...interrupts (add "s")
> +- interrupt-names: Must include the following entries:
> + "misc": interrupt asserted when miscellaneous is recieved
typo
> + "intx": interrupt that is asserted when an legacy interrupt is received
> + "msi1, msi0": interrupt asserted when msi is recieved
typo.
Please specify the order of the interrupts. The implied order here
doesn't match the example.
> +- interrupt-map-mask and interrupt-map: standard PCI properties to define the
> + mapping of the PCI interface to interrupt numbers.
> +- ranges: ranges for the PCI memory regions (I/O space region is not
> + supported by hardware)
> + Please refer to the standard PCI bus binding document for a more
> + detailed explanation
> +- msi-controller: indicates that this is MSI controller node
> +- msi-parent: MSI parent of the root complex itself
> +- legacy-interrupt-controller: Interrupt controller device node for Legacy interrupts
> + - interrupt-controller: identifies the node as an interrupt controller
> + - #interrupt-cells: should be set to 1
> + - #address-cells: specifies the number of cells needed to encode an
> + address. The value must be 0.
> +
> +
> +Example:
> +++++++++
> +
> +nwl_pcie: pcie@fd0e0000 {
> + #address-cells = <3>;
> + #size-cells = <2>;
> + compatible = "xlnx,nwl-pcie-2.11";
> + #interrupt-cells = <1>;
> + msi-controller;
> + device_type = "pci";
> + interrupt-parent = <&gic>;
> + interrupts = <0 114 4>, <0 115 4>, <0 116 4>, <0 117 4>, <0 118 4>;
> + interrupt-names = "msi0", "msi1", "intx", "dummy", "misc";
> + interrupt-map-mask = <0x0 0x0 0x0 0x7>;
> + interrupt-map = <0x0 0x0 0x0 0x1 &pcie_intc 0x1>,
> + <0x0 0x0 0x0 0x2 &pcie_intc 0x2>,
> + <0x0 0x0 0x0 0x3 &pcie_intc 0x3>,
> + <0x0 0x0 0x0 0x4 &pcie_intc 0x4>;
> +
> + msi-parent = <&nwl_pcie>;
> + reg = <0x0 0xfd0e0000 0x1000>,
> + <0x0 0xfd480000 0x1000>,
> + <0x0 0xe0000000 0x1000000>;
> + reg-names = "breg", "pcireg", "cfg";
> + ranges = <0x02000000 0x00000000 0xe1000000 0x00000000 0xe1000000 0 0x0f000000>;
> +
> + pcie_intc: legacy-interrupt-controller {
> + interrupt-controller;
> + #address-cells = <0>;
> + #interrupt-cells = <1>;
> + };
> +
> +};
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index c132bdd..33bbddb 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -15,6 +15,15 @@ config PCI_MVEBU
> depends on ARCH_MVEBU || ARCH_DOVE
> depends on OF
>
> +config PCIE_XILINX_NWL
> + bool "NWL PCIe Core"
> + depends on ARCH_ZYNQMP
> + help
> + Say 'Y' here if you want kernel to support for Xilinx
> + NWL PCIe controller. The controller can act as Root Port
> + or End Point. The current option selection will only
> + support root port enabling.
> +
> config PCIE_DW
> bool
>
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> index 140d66f..6a56df7 100644
> --- a/drivers/pci/host/Makefile
> +++ b/drivers/pci/host/Makefile
> @@ -10,6 +10,7 @@ obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
> obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
> obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
> obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
> +obj-$(CONFIG_PCIE_XILINX_NWL) += pcie-xilinx-nwl.o
> obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
> obj-$(CONFIG_PCI_XGENE_MSI) += pci-xgene-msi.o
> obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
> diff --git a/drivers/pci/host/pcie-xilinx-nwl.c b/drivers/pci/host/pcie-xilinx-nwl.c
> new file mode 100644
> index 0000000..ef91a61
> --- /dev/null
> +++ b/drivers/pci/host/pcie-xilinx-nwl.c
> @@ -0,0 +1,1057 @@
> +/*
> + * PCIe host controller driver for NWL PCIe Bridge
> + * Based on pcie-xilinx.c, pci-tegra.c
> + *
> + * (C) Copyright 2014 - 2015, Xilinx, Inc.
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation, either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/msi.h>
> +#include <linux/of_address.h>
> +#include <linux/of_pci.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_irq.h>
> +#include <linux/pci.h>
> +#include <linux/platform_device.h>
> +#include <linux/irqchip/chained_irq.h>
> +
> +/* Bridge core config registers */
> +#define BRCFG_PCIE_RX0 0x00000000
> +#define BRCFG_PCIE_RX1 0x00000004
> +#define BRCFG_AXI_MASTER 0x00000008
> +#define BRCFG_PCIE_TX 0x0000000C
> +#define BRCFG_INTERRUPT 0x00000010
> +#define BRCFG_RAM_DISABLE0 0x00000014
> +#define BRCFG_RAM_DISABLE1 0x00000018
> +#define BRCFG_PCIE_RELAXED_ORDER 0x0000001C
> +#define BRCFG_PCIE_RX_MSG_FILTER 0x00000020
> +
> +/* Attribute registers */
> +#define NWL_ATTRIB_100 0x00000190
> +
> +/* Egress - Bridge translation registers */
> +#define E_BREG_CAPABILITIES 0x00000200
> +#define E_BREG_STATUS 0x00000204
> +#define E_BREG_CONTROL 0x00000208
> +#define E_BREG_BASE_LO 0x00000210
> +#define E_BREG_BASE_HI 0x00000214
> +#define E_ECAM_CAPABILITIES 0x00000220
> +#define E_ECAM_STATUS 0x00000224
> +#define E_ECAM_CONTROL 0x00000228
> +#define E_ECAM_BASE_LO 0x00000230
> +#define E_ECAM_BASE_HI 0x00000234
> +
> +/* Ingress - address translations */
> +#define I_MSII_CAPABILITIES 0x00000300
> +#define I_MSII_CONTROL 0x00000308
> +#define I_MSII_BASE_LO 0x00000310
> +#define I_MSII_BASE_HI 0x00000314
> +
> +#define I_ISUB_CONTROL 0x000003E8
> +#define SET_ISUB_CONTROL BIT(0)
> +/* Rxed msg fifo - Interrupt status registers */
> +#define MSGF_MISC_STATUS 0x00000400
> +#define MSGF_MISC_MASK 0x00000404
> +#define MSGF_LEG_STATUS 0x00000420
> +#define MSGF_LEG_MASK 0x00000424
> +#define MSGF_MSI_STATUS_LO 0x00000440
> +#define MSGF_MSI_STATUS_HI 0x00000444
> +#define MSGF_MSI_MASK_LO 0x00000448
> +#define MSGF_MSI_MASK_HI 0x0000044C
> +#define MSGF_RX_FIFO_POP 0x00000484
> +#define MSGF_RX_FIFO_TYPE 0x00000488
> +#define MSGF_RX_FIFO_ADDRLO 0x00000490
> +#define MSGF_RX_FIFO_ADDRHI 0x00000494
> +#define MSGF_RX_FIFO_DATA 0x00000498
> +
> +/* Msg filter mask bits */
> +#define CFG_ENABLE_PM_MSG_FWD BIT(1)
> +#define CFG_ENABLE_INT_MSG_FWD BIT(2)
> +#define CFG_ENABLE_ERR_MSG_FWD BIT(3)
> +#define CFG_ENABLE_SLT_MSG_FWD BIT(5)
> +#define CFG_ENABLE_VEN_MSG_FWD BIT(7)
> +#define CFG_ENABLE_OTH_MSG_FWD BIT(13)
> +#define CFG_ENABLE_VEN_MSG_EN BIT(14)
> +#define CFG_ENABLE_VEN_MSG_VEN_INV BIT(15)
> +#define CFG_ENABLE_VEN_MSG_VEN_ID GENMASK(31, 16)
> +#define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \
> + CFG_ENABLE_INT_MSG_FWD | \
> + CFG_ENABLE_ERR_MSG_FWD | \
> + CFG_ENABLE_SLT_MSG_FWD | \
> + CFG_ENABLE_VEN_MSG_FWD | \
> + CFG_ENABLE_OTH_MSG_FWD | \
> + CFG_ENABLE_VEN_MSG_EN | \
> + CFG_ENABLE_VEN_MSG_VEN_INV | \
> + CFG_ENABLE_VEN_MSG_VEN_ID)
> +
> +/* Misc interrupt status mask bits */
> +#define MSGF_MISC_SR_RXMSG_AVAIL BIT(0)
> +#define MSGF_MISC_SR_RXMSG_OVER BIT(1)
> +#define MSGF_MISC_SR_SLAVE_ERR BIT(4)
> +#define MSGF_MISC_SR_MASTER_ERR BIT(5)
> +#define MSGF_MISC_SR_I_ADDR_ERR BIT(6)
> +#define MSGF_MISC_SR_E_ADDR_ERR BIT(7)
> +
> +#define MSGF_MISC_SR_PCIE_CORE GENMASK(18, 16)
> +#define MSGF_MISC_SR_PCIE_CORE_ERR GENMASK(31, 20)
> +
> +#define MSGF_MISC_SR_MASKALL (MSGF_MISC_SR_RXMSG_AVAIL | \
> + MSGF_MISC_SR_RXMSG_OVER | \
> + MSGF_MISC_SR_SLAVE_ERR | \
> + MSGF_MISC_SR_MASTER_ERR | \
> + MSGF_MISC_SR_I_ADDR_ERR | \
> + MSGF_MISC_SR_E_ADDR_ERR | \
> + MSGF_MISC_SR_PCIE_CORE | \
> + MSGF_MISC_SR_PCIE_CORE_ERR)
> +
> +/* Message rx fifo type mask bits */
> +#define MSGF_RX_FIFO_TYPE_MSI (1)
> +#define MSGF_RX_FIFO_TYPE_TYPE GENMASK(1, 0)
> +
> +/* Legacy interrupt status mask bits */
> +#define MSGF_LEG_SR_INTA BIT(0)
> +#define MSGF_LEG_SR_INTB BIT(1)
> +#define MSGF_LEG_SR_INTC BIT(2)
> +#define MSGF_LEG_SR_INTD BIT(3)
> +#define MSGF_LEG_SR_MASKALL (MSGF_LEG_SR_INTA | MSGF_LEG_SR_INTB | \
> + MSGF_LEG_SR_INTC | MSGF_LEG_SR_INTD)
> +
> +/* MSI interrupt status mask bits */
> +#define MSGF_MSI_SR_LO_MASK BIT(0)
> +#define MSGF_MSI_SR_HI_MASK BIT(0)
> +
> +#define MSII_PRESENT BIT(0)
> +#define MSII_ENABLE BIT(0)
> +#define MSII_STATUS_ENABLE BIT(15)
> +
> +/* Bridge config interrupt mask */
> +#define BRCFG_INTERRUPT_MASK BIT(0)
> +#define BREG_PRESENT BIT(0)
> +#define BREG_ENABLE BIT(0)
> +#define BREG_ENABLE_FORCE BIT(1)
> +
> +/* E_ECAM status mask bits */
> +#define E_ECAM_PRESENT BIT(0)
> +#define E_ECAM_SR_WR_PEND BIT(16)
> +#define E_ECAM_SR_RD_PEND BIT(0)
> +#define E_ECAM_SR_MASKALL (E_ECAM_SR_WR_PEND | E_ECAM_SR_RD_PEND)
> +#define E_ECAM_CR_ENABLE BIT(0)
> +#define E_ECAM_SIZE_LOC GENMASK(20, 16)
> +#define E_ECAM_SIZE_SHIFT 16
> +#define ECAM_BUS_LOC_SHIFT 20
> +#define ECAM_DEV_LOC_SHIFT 12
> +#define NWL_ECAM_VALUE_DEFAULT 12
> +#define NWL_ECAM_SIZE_MIN 4096
> +
> +#define ATTR_UPSTREAM_FACING BIT(6)
> +#define CFG_DMA_REG_BAR GENMASK(2, 0)
> +
> +/* msgf_rx_fifo_pop bits */
> +#define MSGF_RX_FIFO_POP_POP BIT(0)
> +
> +#define INT_PCI_MSI_NR (2 * 32)
> +
> +/* Readin the PS_LINKUP */
> +#define PS_LINKUP_OFFSET 0x00000238
> +#define PCIE_PHY_LINKUP_BIT BIT(0)
> +#define PHY_RDY_LINKUP_BIT BIT(1)
> +#define PCIE_USER_LINKUP 0
> +#define PHY_RDY_LINKUP 1
> +#define LINKUP_ITER_CHECK 5
> +
> +/* PCIE Message Request */
> +#define TX_PCIE_MSG 0x00000620
> +#define TX_PCIE_MSG_CNTL 0x00000004
> +#define TX_PCIE_MSG_SPEC_LO 0x00000008
> +#define TX_PCIE_MSG_SPEC_HI 0x0000000C
> +#define TX_PCIE_MSG_DATA 0x00000010
> +
> +#define MSG_BUSY_BIT BIT(8)
> +#define MSG_EXECUTE_BIT BIT(0)
> +#define MSG_DONE_BIT BIT(16)
> +#define MSG_DONE_STATUS_BIT (BIT(25) | BIT(24))
> +#define RANDOM_DIGIT 0x11223344
> +#define PATTRN_SSLP_TLP 0x01005074
> +
> +#define EXP_CAP_BASE 0x60
> +
> +/* SSPL ERROR */
> +#define SLVERR 0x02
> +#define DECERR 0x03
> +
> +struct nwl_msi { /* struct nwl_msi - MSI information */
> + struct msi_controller msi_chip; /* msi_chip: MSI domain */
> + DECLARE_BITMAP(used, INT_PCI_MSI_NR); /* used: Declare Bitmap
> + for MSI */
> + struct irq_domain *dev_domain; /* domain: IRQ domain pointer */
> + unsigned long pages; /* pages: MSI pages */
> + struct mutex lock; /* lock: mutex lock */
> + int irq_msi0; /* irq_msi0: msi0 interrupt number */
> + int irq_msi1; /* irq_msi1: msi1 interrupt number */
> +};
> +
> +/**
> + * struct nwl_pcie - PCIe port information
> + *
> + * @dev: Device pointer
> + * @breg_base: IO Mapped Bridge Register Base
> + * @pcireg_base: IO Mapped PCIe controller attributes
> + * @ecam_base: IO Mapped configuration space
> + * @phys_breg_base: Physical Bridge Register Base
> + * @phys_pcie_reg_base: Physical PCIe Controller Attributes
> + * @phys_ecam_base: Physical Configuration Base
> + * @breg_size: Bridge Register space
> + * @pcie_reg_size: PCIe controller attributes space
> + * @ecam_size: PCIe Configuration space
> + * @irq_intx: Legacy interrupt number
> + * @irq_misc: Misc interrupt number
> + * @ecam_value: ECAM value
> + * @last_busno: Last Bus number configured
> + * @link_up: Link status flag
> + * @bus: PCI bus
> + * @msi: MSI domain
> + * @legacy_irq_domain: IRQ domain pointer
> + */
> +struct nwl_pcie {
> + struct device *dev;
> + void __iomem *breg_base;
> + void __iomem *pcireg_base;
> + void __iomem *ecam_base;
> + u32 phys_breg_base;
> + u32 phys_pcie_reg_base;
> + u32 phys_ecam_base;
> + u32 breg_size;
> + u32 pcie_reg_size;
> + u32 ecam_size;
> + int irq_intx;
> + int irq_misc;
> + u32 ecam_value;
> + u8 last_busno;
> + u8 link_up;
> + struct pci_bus *bus;
> + struct nwl_msi msi;
> + struct irq_domain *legacy_irq_domain;
> +};
> +
> +static inline u32 nwl_bridge_readl(struct nwl_pcie *pcie, u32 off)
> +{
> + return readl(pcie->breg_base + off);
> +}
> +
> +static inline void nwl_bridge_writel(struct nwl_pcie *pcie, u32 val, u32 off)
> +{
> + writel(val, pcie->breg_base + off);
> +}
> +
> +static inline bool nwl_pcie_link_up(struct nwl_pcie *pcie, u32 check_link_up)
> +{
> + unsigned int status = -EINVAL;
> +
> + if (check_link_up == PCIE_USER_LINKUP)
> + status = (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) &
> + PCIE_PHY_LINKUP_BIT) ? 1 : 0;
> + else if (check_link_up == PHY_RDY_LINKUP)
> + status = (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) &
> + PHY_RDY_LINKUP_BIT) ? 1 : 0;
> + return status;
> +}
> +
> +/**
> + * nwl_pcie_get_config_base - Get configuration base
> + *
> + * @bus: Bus structure of current bus
> + * @devfn: Device/function
> + * @where: Offset from base
> + *
> + * Return: Base address of the configuration space needed to be
> + * accessed.
> + */
> +static void __iomem *nwl_pcie_get_config_base(struct pci_bus *bus,
> + unsigned int devfn,
> + int where)
> +{
> + struct nwl_pcie *pcie = bus->sysdata;
> + int relbus;
> +
> + relbus = (bus->number << ECAM_BUS_LOC_SHIFT) |
> + (devfn << ECAM_DEV_LOC_SHIFT);
> +
> + return pcie->ecam_base + relbus + where;
> +}
> +
> +/**
> + * nwl_setup_sspl - Set Slot Power limit
> + *
> + * @pcie: PCIe port information
> + */
> +static int nwl_setup_sspl(struct nwl_pcie *pcie)
> +{
> + unsigned int status;
> + int retval = 0;
> +
> + do {
> + status = nwl_bridge_readl(pcie, TX_PCIE_MSG) & MSG_BUSY_BIT;
> + if (!status) {
> + /*
> + * Generate the TLP message for a single EP
> + * [TODO] Add a multi-endpoint code
> + */
> + nwl_bridge_writel(pcie, 0x0,
> + TX_PCIE_MSG + TX_PCIE_MSG_CNTL);
> + nwl_bridge_writel(pcie, 0x0,
> + TX_PCIE_MSG + TX_PCIE_MSG_SPEC_LO);
> + nwl_bridge_writel(pcie, 0x0,
> + TX_PCIE_MSG + TX_PCIE_MSG_SPEC_HI);
> + nwl_bridge_writel(pcie, 0x0,
> + TX_PCIE_MSG + TX_PCIE_MSG_DATA);
> + /* Pattern to generate SSLP TLP */
> + nwl_bridge_writel(pcie, PATTRN_SSLP_TLP,
> + TX_PCIE_MSG + TX_PCIE_MSG_CNTL);
> + nwl_bridge_writel(pcie, RANDOM_DIGIT,
> + TX_PCIE_MSG + TX_PCIE_MSG_DATA);
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie,
> + TX_PCIE_MSG) | 0x1, TX_PCIE_MSG);
> + mdelay(2);
> + status = nwl_bridge_readl(pcie, TX_PCIE_MSG)
> + & MSG_DONE_BIT;
> + if (status) {
> + status = nwl_bridge_readl(pcie, TX_PCIE_MSG)
> + & MSG_DONE_STATUS_BIT;
> + if (status == SLVERR) {
> + dev_err(pcie->dev, "AXI slave error");
> + retval = SLVERR;
> + } else if (status == DECERR) {
> + dev_err(pcie->dev, "AXI Decode error");
> + retval = DECERR;
> + }
> + } else {
> + retval = 1;
> + }
> + }
> + } while (status);
> +
> + return retval;
> +}
> +
> +/**
> + * nwl_nwl_readl_config - Read configuration space
> + *
> + * @bus: Bus structure of current bus
> + * @devfn: Device/function
> + * @where: Offset from base
> + * @size: Byte/word/dword
> + * @val: Value to be read
> + *
> + * Return: PCIBIOS_SUCCESSFUL on success
> + * PCIBIOS_DEVICE_NOT_FOUND on failure.
> + */
> +static int nwl_nwl_readl_config(struct pci_bus *bus,
> + unsigned int devfn,
> + int where,
> + int size,
> + u32 *val)
> +{
> + void __iomem *addr;
> +
> + if (!bus->number && devfn > 0) {
> + *val = 0xFFFFFFFF;
> + return PCIBIOS_DEVICE_NOT_FOUND;
> + }
> +
> + addr = nwl_pcie_get_config_base(bus, devfn, where);
> +
> + switch (size) {
> + case 1:
> + *val = readb(addr);
> + break;
> + case 2:
> + *val = readw(addr);
> + break;
> + default:
> + *val = readl(addr);
> + break;
> + }
> + return PCIBIOS_SUCCESSFUL;
> +}
> +
> +/**
> + * nwl_nwl_writel_config - Write configuration space
> + *
> + * @bus: Bus structure of current bus
> + * @devfn: Device/function
> + * @where: Offset from base
> + * @size: Byte/word/dword
> + * @val: Value to be written to device
> + *
> + * Return: PCIBIOS_SUCCESSFUL on success,
> + * PCIBIOS_DEVICE_NOT_FOUND on failure.
> + */
> +static int nwl_nwl_writel_config(struct pci_bus *bus,
> + unsigned int devfn,
> + int where,
> + int size,
> + u32 val)
> +{
> + void __iomem *addr;
> + int retval;
> + struct nwl_pcie *pcie = bus->sysdata;
> +
> + if (!bus->number && devfn > 0)
> + return PCIBIOS_DEVICE_NOT_FOUND;
> +
> + addr = nwl_pcie_get_config_base(bus, devfn, where);
> +
> + switch (size) {
> + case 1:
> + writeb(val, addr);
> + break;
> + case 2:
> + writew(val, addr);
> + break;
> + default:
> + writel(val, addr);
> + break;
> + }
> + if (addr == (pcie->ecam_base + EXP_CAP_BASE + PCI_EXP_SLTCAP)) {
> + retval = nwl_setup_sspl(pcie);
> + if (retval)
> + return PCIBIOS_SET_FAILED;
> + }
> +
> + return PCIBIOS_SUCCESSFUL;
> +}
> +
> +/* PCIe operations */
> +static struct pci_ops nwl_pcie_ops = {
> + .read = nwl_nwl_readl_config,
> + .write = nwl_nwl_writel_config,
> +};
> +
> +static irqreturn_t nwl_pcie_misc_handler(int irq, void *data)
> +{
> + struct nwl_pcie *pcie = data;
> + u32 misc_stat;
> +
> + /* Checking for misc interrupts */
> + misc_stat = nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
> + MSGF_MISC_SR_MASKALL;
> + if (!misc_stat)
> + return IRQ_NONE;
> +
> + if (misc_stat & MSGF_MISC_SR_RXMSG_OVER)
> + dev_err(pcie->dev, "Received Message FIFO Overflow\n");
> +
> + if (misc_stat & MSGF_MISC_SR_SLAVE_ERR)
> + dev_err(pcie->dev, "Slave error\n");
> +
> + if (misc_stat & MSGF_MISC_SR_MASTER_ERR)
> + dev_err(pcie->dev, "Master error\n");
> +
> + if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR)
> + dev_err(pcie->dev,
> + "In Misc Ingress address translation error\n");
> +
> + if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR)
> + dev_err(pcie->dev,
> + "In Misc Egress address translation error\n");
> +
> + if (misc_stat & MSGF_MISC_SR_PCIE_CORE_ERR)
> + dev_err(pcie->dev, "PCIe Core error\n");
> +
> + /* Clear misc interrupt status */
> + nwl_bridge_writel(pcie, misc_stat, MSGF_MISC_STATUS);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void nwl_pcie_leg_handler(int irq, struct irq_desc *desc)
> +{
> + struct irq_chip *chip = irq_desc_get_chip(desc);
> + struct nwl_pcie *pcie;
> + unsigned long status;
> + u32 bit;
> + u32 virq;
> +
> + chained_irq_enter(chip, desc);
> + pcie = irq_desc_get_handler_data(desc);
> +
> + while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
> + MSGF_LEG_SR_MASKALL) != 0) {
> + for_each_set_bit(bit, &status, 4) {
> +
> + virq = irq_find_mapping(pcie->legacy_irq_domain,
> + bit + 1);
> + if (virq)
> + generic_handle_irq(virq);
> + }
> + }
> +
> + chained_irq_exit(chip, desc);
> +
> +}
> +
> +static void nwl_pcie_msi_handler_high(unsigned int irq, struct irq_desc *desc)
> +{
> + struct irq_chip *chip = irq_desc_get_chip(desc);
> + struct nwl_pcie *pcie;
> + struct nwl_msi *msi;
> + unsigned long status;
> + u32 bit;
> + u32 virq;
> +
> + chained_irq_enter(chip, desc);
> + pcie = irq_desc_get_handler_data(desc);
> + msi = &pcie->msi;
> +
> + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI)) != 0) {
> + for_each_set_bit(bit, &status, 32) {
> + nwl_bridge_writel(pcie, 1 << bit, MSGF_MSI_STATUS_HI);
> + virq = irq_find_mapping(msi->dev_domain, bit);
> + if (virq)
> + generic_handle_irq(virq);
> + }
> + }
> +
> + chained_irq_exit(chip, desc);
> +}
> +
> +
> +static void nwl_pcie_msi_handler_low(unsigned int irq, struct irq_desc *desc)
> +{
> + struct irq_chip *chip = irq_desc_get_chip(desc);
> + struct nwl_pcie *pcie;
> + struct nwl_msi *msi;
> + unsigned long status;
> + u32 bit;
> + u32 virq;
> +
> + chained_irq_enter(chip, desc);
> + pcie = irq_desc_get_handler_data(desc);
> + msi = &pcie->msi;
> +
> + while ((status = nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO)) != 0) {
> + for_each_set_bit(bit, &status, 32) {
> + nwl_bridge_writel(pcie, 1 << bit, MSGF_MSI_STATUS_LO);
> + virq = irq_find_mapping(msi->dev_domain, bit);
> + if (virq)
> + generic_handle_irq(virq);
> + }
> + }
> +
> + chained_irq_exit(chip, desc);
> +}
> +
> +static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq,
> + irq_hw_number_t hwirq)
> +{
> + irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
> + irq_set_chip_data(irq, domain->host_data);
> +
> + return 0;
> +}
> +
> +static const struct irq_domain_ops legacy_domain_ops = {
> + .map = nwl_legacy_map,
> +};
> +
> +#ifdef CONFIG_PCI_MSI
> +static struct irq_chip nwl_msi_irq_chip = {
> + .name = "nwl_pcie:msi",
> + .irq_enable = unmask_msi_irq,
> + .irq_disable = mask_msi_irq,
> + .irq_mask = mask_msi_irq,
> + .irq_unmask = unmask_msi_irq,
> +
> +};
> +
> +static struct msi_domain_info nwl_msi_domain_info = {
> + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
> + .chip = &nwl_msi_irq_chip,
> +};
> +#endif
> +
> +static void nwl_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
> +{
> + struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
> + struct nwl_msi *msi = &pcie->msi;
> +
> + msg->address_lo = virt_to_phys((void *)msi->pages);
> + msg->address_hi = 0;
> + msg->data = data->hwirq;
> +
> +}
> +
> +static int nwl_msi_set_affinity(struct irq_data *irq_data,
> + const struct cpumask *mask, bool force)
> +{
> + return -EINVAL;
> +}
> +
> +static struct irq_chip nwl_irq_chip = {
> + .name = "Xilinx MSI",
> + .irq_compose_msi_msg = nwl_compose_msi_msg,
> + .irq_set_affinity = nwl_msi_set_affinity,
> +};
> +
> +static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs, void *args)
> +{
> + struct nwl_pcie *pcie = domain->host_data;
> + struct nwl_msi *msi = &pcie->msi;
> + unsigned long bit;
> +
> + mutex_lock(&msi->lock);
> + bit = find_first_zero_bit(msi->used, INT_PCI_MSI_NR);
> + if (bit < INT_PCI_MSI_NR)
> + set_bit(bit, msi->used);
> + else
> + bit = -ENOSPC;
> +
> + mutex_unlock(&msi->lock);
> + irq_domain_set_info(domain, virq, bit, &nwl_irq_chip,
> + domain->host_data, handle_simple_irq,
> + NULL, NULL);
> + return 0;
> +}
> +
> +static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs)
> +{
> + struct irq_data *data = irq_domain_get_irq_data(domain, virq);
> + struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
> + struct nwl_msi *msi = &pcie->msi;
> +
> + mutex_lock(&msi->lock);
> + if (!test_bit(data->hwirq, msi->used))
> + dev_err(pcie->dev, "freeing unused MSI %lu\n", data->hwirq);
> + else
> + clear_bit(data->hwirq, msi->used);
> +
> + mutex_unlock(&msi->lock);
> +}
> +
> +static const struct irq_domain_ops dev_msi_domain_ops = {
> + .alloc = nwl_irq_domain_alloc,
> + .free = nwl_irq_domain_free,
> +};
> +
> +static void nwl_pcie_free_irq_domain(struct nwl_pcie *pcie)
> +{
> + int i;
> + u32 irq;
> +
> +#ifdef CONFIG_PCI_MSI
> + struct nwl_msi *msi = &pcie->msi;
> +#endif
> +
> + for (i = 0; i < 4; i++) {
> + irq = irq_find_mapping(pcie->legacy_irq_domain, i + 1);
> + if (irq > 0)
> + irq_dispose_mapping(irq);
> + }
> +
> + irq_domain_remove(pcie->legacy_irq_domain);
> +
> +#ifdef CONFIG_PCI_MSI
> + irq_set_chained_handler_and_data(msi->irq_msi0, NULL, NULL);
> + irq_set_chained_handler_and_data(msi->irq_msi1, NULL, NULL);
> +
> + irq_domain_remove(msi->msi_chip.domain);
> + irq_domain_remove(msi->dev_domain);
> +#endif
> +
> +}
> +
> +static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie)
> +{
> + struct device_node *node = pcie->dev->of_node;
> + struct device_node *legacy_intc_node;
> +
> +#ifdef CONFIG_PCI_MSI
> + struct nwl_msi *msi = &pcie->msi;
> +#endif
> +
> + legacy_intc_node = of_get_next_child(node, NULL);
> + if (!legacy_intc_node) {
> + dev_err(pcie->dev, "No legacy intc node found\n");
> + return PTR_ERR(legacy_intc_node);
> + }
> +
> + pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node, 4,
> + &legacy_domain_ops,
> + pcie);
> +
> + if (!pcie->legacy_irq_domain) {
> + dev_err(pcie->dev, "failed to create IRQ domain\n");
> + return -ENOMEM;
> + }
> +
> +#ifdef CONFIG_PCI_MSI
> + msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR,
> + &dev_msi_domain_ops, pcie);
> + if (!msi->dev_domain) {
> + dev_err(pcie->dev, "failed to create dev IRQ domain\n");
> + return -ENOMEM;
> + }
> + msi->msi_chip.domain = pci_msi_create_irq_domain(node,
> + &nwl_msi_domain_info,
> + msi->dev_domain);
> + if (!msi->msi_chip.domain) {
> + dev_err(pcie->dev, "failed to create msi IRQ domain\n");
> + irq_domain_remove(msi->dev_domain);
> + return -ENOMEM;
> + }
> +#endif
> + return 0;
> +}
> +
> +static int nwl_pcie_enable_msi(struct nwl_pcie *pcie, struct pci_bus *bus)
> +{
> + struct platform_device *pdev = to_platform_device(pcie->dev);
> + struct nwl_msi *msi = &pcie->msi;
> + unsigned long base;
> + int ret;
> +
> + mutex_init(&msi->lock);
> +
> + msi->msi_chip.dev = pcie->dev;
> + bus->msi = &msi->msi_chip;
> +
> + /* Check for msii_present bit */
> + ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT;
> + if (!ret) {
> + dev_err(pcie->dev, "MSI not present\n");
> + ret = -EIO;
> + goto err;
> + }
> +
> + /* Enable MSII */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
> + MSII_ENABLE, I_MSII_CONTROL);
> +
> + /* Enable MSII status */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
> + MSII_STATUS_ENABLE, I_MSII_CONTROL);
> +
> + /* setup AFI/FPCI range */
> + msi->pages = __get_free_pages(GFP_KERNEL, 0);
> + base = virt_to_phys((void *)msi->pages);
> + nwl_bridge_writel(pcie, base, I_MSII_BASE_LO);
> + nwl_bridge_writel(pcie, 0x0, I_MSII_BASE_HI);
> +
> + /* Disable high range msi interrupts */
> + nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI);
> +
> + /* Clear pending high range msi interrupts */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) &
> + MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI);
> + /* Get msi_1 IRQ number */
> + msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1");
> + if (msi->irq_msi1 < 0) {
> + dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi1);
> + goto err;
> + }
> + /* Register msi handler */
> + irq_set_chained_handler_and_data(msi->irq_msi1,
> + nwl_pcie_msi_handler_high, pcie);
> +
> + /* Enable all high range msi interrupts */
> + nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI);
> +
> + /* Disable low range msi interrupts */
> + nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO);
> +
> + /* Clear pending low range msi interrupts */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) &
> + MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO);
> + /* Get msi_0 IRQ number */
> + msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0");
> + if (msi->irq_msi0 < 0) {
> + dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi0);
> + goto err;
> + }
> +
> + /* Register msi handler */
> + irq_set_chained_handler_and_data(msi->irq_msi0,
> + nwl_pcie_msi_handler_low, pcie);
> +
> + /* Enable all low range msi interrupts */
> + nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO);
> +
> + return 0;
> +err:
> + return ret;
> +}
> +
> +static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
> +{
> + struct platform_device *pdev = to_platform_device(pcie->dev);
> + u32 breg_val, ecam_val, first_busno = 0;
> + int err;
> + int check_link_up = 0;
> +
> + /* Check for BREG present bit */
> + breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT;
> + if (!breg_val) {
> + dev_err(pcie->dev, "BREG is not present\n");
> + return breg_val;
> + }
> + /* Write bridge_off to breg base */
> + nwl_bridge_writel(pcie, (u32)(pcie->phys_breg_base),
> + E_BREG_BASE_LO);
> +
> + /* Enable BREG */
> + nwl_bridge_writel(pcie, ~BREG_ENABLE_FORCE & BREG_ENABLE,
> + E_BREG_CONTROL);
> +
> + /* Disable DMA channel registers */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX0) |
> + CFG_DMA_REG_BAR, BRCFG_PCIE_RX0);
> +
> + /* Enable the bridge config interrupt */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_INTERRUPT) |
> + BRCFG_INTERRUPT_MASK, BRCFG_INTERRUPT);
> + /* Enable Ingress subtractive decode translation */
> + nwl_bridge_writel(pcie, SET_ISUB_CONTROL, I_ISUB_CONTROL);
> +
> + /* Enable msg filtering details */
> + nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK,
> + BRCFG_PCIE_RX_MSG_FILTER);
> + do {
> + err = nwl_pcie_link_up(pcie, PHY_RDY_LINKUP);
> + if (err != 1) {
> + check_link_up++;
> + if (check_link_up > LINKUP_ITER_CHECK)
> + return -ENODEV;
> + mdelay(1000);
> + }
> + } while (!err);
> +
> + /* Check for ECAM present bit */
> + ecam_val = nwl_bridge_readl(pcie, E_ECAM_CAPABILITIES) & E_ECAM_PRESENT;
> + if (!ecam_val) {
> + dev_err(pcie->dev, "ECAM is not present\n");
> + return ecam_val;
> + }
> +
> + /* Enable ECAM */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
> + E_ECAM_CR_ENABLE, E_ECAM_CONTROL);
> + /* Write ecam_value on ecam_control */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
> + (pcie->ecam_value << E_ECAM_SIZE_SHIFT),
> + E_ECAM_CONTROL);
> + /* Write phy_reg_base to ecam base */
> + nwl_bridge_writel(pcie, (u32)pcie->phys_ecam_base, E_ECAM_BASE_LO);
> +
> + /* Get bus range */
> + ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL);
> + pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT;
> + /* Write primary, secondary and subordinate bus numbers */
> + ecam_val = first_busno;
> + ecam_val |= (first_busno + 1) << 8;
> + ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT);
> + writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS));
> +
> + /* Check if PCIe link is up? */
> + pcie->link_up = nwl_pcie_link_up(pcie, PCIE_USER_LINKUP);
> + if (!pcie->link_up)
> + dev_info(pcie->dev, "Link is DOWN\n");
> + else
> + dev_info(pcie->dev, "Link is UP\n");
> +
> + /* Disable all misc interrupts */
> + nwl_bridge_writel(pcie, (u32)~MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
> +
> + /* Clear pending misc interrupts */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
> + MSGF_MISC_SR_MASKALL, MSGF_MISC_STATUS);
> +
> + /* Get misc IRQ number */
> + pcie->irq_misc = platform_get_irq_byname(pdev, "misc");
> + if (pcie->irq_misc < 0) {
> + dev_err(&pdev->dev, "failed to get misc IRQ#%d\n",
> + pcie->irq_misc);
> + return pcie->irq_misc;
> + }
> + /* Register misc handler */
> + err = devm_request_irq(pcie->dev, pcie->irq_misc,
> + nwl_pcie_misc_handler, IRQF_SHARED,
> + "nwl_pcie:misc", pcie);
> + if (err) {
> + dev_err(pcie->dev, "fail to register misc IRQ#%d\n",
> + pcie->irq_misc);
> + return err;
> + }
> + /* Enable all misc interrupts */
> + nwl_bridge_writel(pcie, MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
> +
> + /* Disable all legacy interrupts */
> + nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
> +
> + /* Clear pending legacy interrupts */
> + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
> + MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS);
> + /* Get intx IRQ number */
> + pcie->irq_intx = platform_get_irq_byname(pdev, "intx");
> + if (pcie->irq_intx < 0) {
> + dev_err(&pdev->dev, "failed to get intx IRQ#%d\n",
> + pcie->irq_intx);
> + return pcie->irq_intx;
> + }
> +
> + /* Enable all legacy interrupts */
> + nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
> +
> + return 0;
> +}
> +
> +static int nwl_pcie_parse_dt(struct nwl_pcie *pcie,
> + struct platform_device *pdev)
> +{
> + struct device_node *node = pcie->dev->of_node;
> + struct resource *res;
> + const char *type;
> +
> + /* Check for device type */
> + type = of_get_property(node, "device_type", NULL);
> + if (!type || strcmp(type, "pci")) {
> + dev_err(pcie->dev, "invalid \"device_type\" %s\n", type);
> + return -EINVAL;
> + }
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg");
> + pcie->breg_base = devm_ioremap_resource(pcie->dev, res);
> + if (IS_ERR(pcie->breg_base))
> + return PTR_ERR(pcie->breg_base);
> + pcie->phys_breg_base = res->start;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcireg");
> + pcie->pcireg_base = devm_ioremap_resource(pcie->dev, res);
> + if (IS_ERR(pcie->pcireg_base))
> + return PTR_ERR(pcie->pcireg_base);
> + pcie->phys_pcie_reg_base = res->start;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
> + pcie->ecam_base = devm_ioremap_resource(pcie->dev, res);
> + if (IS_ERR(pcie->ecam_base))
> + return PTR_ERR(pcie->ecam_base);
> + pcie->phys_ecam_base = res->start;
> +
> + /* Get intx IRQ number */
> + pcie->irq_intx = platform_get_irq_byname(pdev, "intx");
> + if (pcie->irq_intx < 0) {
> + dev_err(&pdev->dev, "failed to get intx IRQ#%d\n",
> + pcie->irq_intx);
> + return pcie->irq_intx;
> + }
> +
> + /* Register intx handler */
> + irq_set_chained_handler_and_data(pcie->irq_intx,
> + nwl_pcie_leg_handler, pcie);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id nwl_pcie_of_match[] = {
> + { .compatible = "xlnx,nwl-pcie-2.11", },
> + {}
> +};
> +
> +static int nwl_pcie_probe(struct platform_device *pdev)
> +{
> + struct device_node *node = pdev->dev.of_node;
> + struct nwl_pcie *pcie;
> + struct pci_bus *bus;
> + int err;
> +
> + resource_size_t iobase = 0;
> + LIST_HEAD(res);
> +
> + pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
> + if (!pcie)
> + return -ENOMEM;
> +
> + pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT;
> +
> + pcie->dev = &pdev->dev;
> +
> + err = nwl_pcie_parse_dt(pcie, pdev);
> + if (err) {
> + dev_err(pcie->dev, "Parsing DT failed\n");
> + return err;
> + }
> + /* Bridge initialization */
> + err = nwl_pcie_bridge_init(pcie);
> + if (err) {
> + dev_err(pcie->dev, "HW Initalization failed\n");
> + return err;
> + }
> +
> + err = of_pci_get_host_bridge_resources(node, 0, 0xff, &res, &iobase);
> + if (err) {
> + pr_err("Getting bridge resources failed\n");
> + return err;
> + }
> +
> + err = nwl_pcie_init_irq_domain(pcie);
> + if (err) {
> + dev_err(pcie->dev, "Failed creating IRQ Domain\n");
> + return err;
> + }
> +
> + bus = pci_create_root_bus(&pdev->dev, 0,
> + &nwl_pcie_ops, pcie, &res);
> + if (!bus)
> + return -ENOMEM;
> +
> + /* Enable MSI */
> + if (IS_ENABLED(CONFIG_PCI_MSI)) {
> + err = nwl_pcie_enable_msi(pcie, bus);
> + if (err < 0) {
> + dev_err(&pdev->dev,
> + "failed to enable MSI support: %d\n", err);
> + return err;
> + }
> + }
> + pci_scan_child_bus(bus);
> + pci_assign_unassigned_bus_resources(bus);
> + pci_bus_add_devices(bus);
> + platform_set_drvdata(pdev, pcie);
> +
> + return 0;
> +}
> +
> +static int nwl_pcie_remove(struct platform_device *pdev)
> +{
> + struct nwl_pcie *pcie = platform_get_drvdata(pdev);
> +
> + nwl_pcie_free_irq_domain(pcie);
> + platform_set_drvdata(pdev, NULL);
> +
> + return 0;
> +}
> +
> +static struct platform_driver nwl_pcie_driver = {
> + .driver = {
> + .name = "nwl-pcie",
> + .of_match_table = nwl_pcie_of_match,
> + },
> + .probe = nwl_pcie_probe,
> + .remove = nwl_pcie_remove,
> +};
> +module_platform_driver(nwl_pcie_driver);
> +
> +MODULE_AUTHOR("Xilinx, Inc");
> +MODULE_DESCRIPTION("NWL PCIe driver");
> +MODULE_LICENSE("GPL");
> --
> 2.1.1
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