> Subject: Re: [PATCH v6 2/2] PCI: xilinx-cpm: Add Versal CPM Root Port driver
>
> On Fri, Apr 24, 2020 at 05:34:04PM +0530, Bharat Kumar Gogada wrote:
> > - Add support for Versal CPM as Root Port.
> > - The Versal ACAP devices include CCIX-PCIe Module (CPM). The integrated
> > block for CPM along with the integrated bridge can function
> > as PCIe Root Port.
> > - Bridge error and legacy interrupts in Versal CPM are handled using
> > Versal CPM specific MISC interrupt line.
> >
> > Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@xxxxxxxxxx>
> > ---
> > drivers/pci/controller/Kconfig | 9 +
> > drivers/pci/controller/Makefile | 1 +
> > drivers/pci/controller/pcie-xilinx-cpm.c | 521
> > +++++++++++++++++++++++++++++++
> > 3 files changed, 531 insertions(+)
> > create mode 100644 drivers/pci/controller/pcie-xilinx-cpm.c
> >
> > diff --git a/drivers/pci/controller/Kconfig
> > b/drivers/pci/controller/Kconfig index 20bf00f..ca0ae24 100644
> > --- a/drivers/pci/controller/Kconfig
> > +++ b/drivers/pci/controller/Kconfig
> > @@ -81,6 +81,15 @@ config PCIE_XILINX
> > Say 'Y' here if you want kernel to support the Xilinx AXI PCIe
> > Host Bridge driver.
> >
> > +config PCIE_XILINX_CPM
> > + bool "Xilinx Versal CPM host bridge support"
>
> Why can't this be a module?
Hi Rob, Thanks for your time. currently all host controller drivers are bool, module support is removed.
>
> > + depends on ARCH_ZYNQMP || COMPILE_TEST
> > + select PCI_HOST_COMMON
> > + help
> > + Say 'Y' here if you want kernel support for the
> > + Xilinx Versal CPM host bridge. The driver supports
> > + MSI/MSI-X interrupts using GICv3 ITS feature.
> > +
> > config PCI_XGENE
> > bool "X-Gene PCIe controller"
> > depends on ARM64 || COMPILE_TEST
> > diff --git a/drivers/pci/controller/Makefile
> > b/drivers/pci/controller/Makefile index 01b2502..78dabda 100644
> > --- a/drivers/pci/controller/Makefile
> > +++ b/drivers/pci/controller/Makefile
> > @@ -12,6 +12,7 @@ obj-$(CONFIG_PCI_HOST_COMMON) += pci-host-
> common.o
> > obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
> > obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
> > obj-$(CONFIG_PCIE_XILINX_NWL) += pcie-xilinx-nwl.o
> > +obj-$(CONFIG_PCIE_XILINX_CPM) += pcie-xilinx-cpm.o
> > obj-$(CONFIG_PCI_V3_SEMI) += pci-v3-semi.o
> > obj-$(CONFIG_PCI_XGENE_MSI) += pci-xgene-msi.o
> > obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o diff --git
> > a/drivers/pci/controller/pcie-xilinx-cpm.c
> > b/drivers/pci/controller/pcie-xilinx-cpm.c
> > new file mode 100644
> > index 0000000..30ddec5
> > --- /dev/null
> > +++ b/drivers/pci/controller/pcie-xilinx-cpm.c
> > @@ -0,0 +1,521 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * PCIe host controller driver for Xilinx Versal CPM DMA Bridge
> > + *
> > + * (C) Copyright 2019 - 2020, Xilinx, Inc.
> > + */
> > +
> > +#include <linux/interrupt.h>
> > +#include <linux/irq.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.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/pci-ecam.h>
> > +
> > +#include "../pci.h"
> > +
> > +/* Register definitions */
> > +#define XILINX_CPM_PCIE_REG_IDR 0x00000E10
> > +#define XILINX_CPM_PCIE_REG_IMR 0x00000E14
> > +#define XILINX_CPM_PCIE_REG_PSCR 0x00000E1C
> > +#define XILINX_CPM_PCIE_REG_RPSC 0x00000E20
> > +#define XILINX_CPM_PCIE_REG_RPEFR 0x00000E2C
> > +#define XILINX_CPM_PCIE_REG_IDRN 0x00000E38
> > +#define XILINX_CPM_PCIE_REG_IDRN_MASK 0x00000E3C
> > +#define XILINX_CPM_PCIE_MISC_IR_STATUS 0x00000340
> > +#define XILINX_CPM_PCIE_MISC_IR_ENABLE 0x00000348
> > +#define XILINX_CPM_PCIE_MISC_IR_LOCAL BIT(1)
> > +
> > +/* Interrupt registers definitions */
> > +#define XILINX_CPM_PCIE_INTR_LINK_DOWN BIT(0)
> > +#define XILINX_CPM_PCIE_INTR_HOT_RESET BIT(3)
> > +#define XILINX_CPM_PCIE_INTR_CFG_TIMEOUT BIT(8)
> > +#define XILINX_CPM_PCIE_INTR_CORRECTABLE BIT(9)
> > +#define XILINX_CPM_PCIE_INTR_NONFATAL BIT(10)
> > +#define XILINX_CPM_PCIE_INTR_FATAL BIT(11)
> > +#define XILINX_CPM_PCIE_INTR_INTX BIT(16)
> > +#define XILINX_CPM_PCIE_INTR_MSI BIT(17)
> > +#define XILINX_CPM_PCIE_INTR_SLV_UNSUPP BIT(20)
> > +#define XILINX_CPM_PCIE_INTR_SLV_UNEXP BIT(21)
> > +#define XILINX_CPM_PCIE_INTR_SLV_COMPL BIT(22)
> > +#define XILINX_CPM_PCIE_INTR_SLV_ERRP BIT(23)
> > +#define XILINX_CPM_PCIE_INTR_SLV_CMPABT BIT(24)
> > +#define XILINX_CPM_PCIE_INTR_SLV_ILLBUR BIT(25)
> > +#define XILINX_CPM_PCIE_INTR_MST_DECERR BIT(26)
> > +#define XILINX_CPM_PCIE_INTR_MST_SLVERR BIT(27)
> > +#define XILINX_CPM_PCIE_IMR_ALL_MASK 0x1FF39FF9
> > +#define XILINX_CPM_PCIE_IDR_ALL_MASK 0xFFFFFFFF
> > +#define XILINX_CPM_PCIE_IDRN_MASK GENMASK(19, 16)
> > +#define XILINX_CPM_PCIE_INTR_CFG_PCIE_TIMEOUT BIT(4)
> > +#define XILINX_CPM_PCIE_INTR_CFG_ERR_POISON BIT(12)
> > +#define XILINX_CPM_PCIE_INTR_PME_TO_ACK_RCVD BIT(15)
> > +#define XILINX_CPM_PCIE_INTR_PM_PME_RCVD BIT(17)
> > +#define XILINX_CPM_PCIE_INTR_SLV_PCIE_TIMEOUT BIT(28)
> > +#define XILINX_CPM_PCIE_IDRN_SHIFT 16
> > +
> > +/* Root Port Error FIFO Read Register definitions */
> > +#define XILINX_CPM_PCIE_RPEFR_ERR_VALID BIT(18)
> > +#define XILINX_CPM_PCIE_RPEFR_REQ_ID GENMASK(15, 0)
> > +#define XILINX_CPM_PCIE_RPEFR_ALL_MASK 0xFFFFFFFF
> > +
> > +/* Root Port Status/control Register definitions */
> > +#define XILINX_CPM_PCIE_REG_RPSC_BEN BIT(0)
> > +
> > +/* Phy Status/Control Register definitions */
> > +#define XILINX_CPM_PCIE_REG_PSCR_LNKUP BIT(11)
> > +
> > +/**
> > + * struct xilinx_cpm_pcie_port - PCIe port information
> > + * @reg_base: Bridge Register Base
> > + * @cpm_base: CPM System Level Control and Status Register(SLCR) Base
> > + * @irq: Interrupt number
> > + * @root_busno: Root Bus number
> > + * @dev: Device pointer
> > + * @leg_domain: Legacy IRQ domain pointer
> > + * @irq_misc: Legacy and error interrupt number
> > + * @leg_mask_lock: lock for legacy interrupts */ struct
> > +xilinx_cpm_pcie_port {
> > + void __iomem *reg_base;
> > + void __iomem *cpm_base;
> > + u32 irq;
>
> Unused?
>
> > + u8 root_busno;
>
> Shouldn't need this. The bus number gets stored in the bridge struct.
Okay, will remove this.
>
> > + struct device *dev;
> > + struct irq_domain *leg_domain;
> > + struct pci_config_window *cfg;
> > + int irq_misc;
> > + raw_spinlock_t leg_mask_lock;
> > +};
> > +
> > +static inline u32 pcie_read(struct xilinx_cpm_pcie_port *port, u32
> > +reg) {
> > + return readl(port->reg_base + reg);
> > +}
> > +
> > +static inline void pcie_write(struct xilinx_cpm_pcie_port *port,
> > + u32 val, u32 reg)
> > +{
> > + writel(val, port->reg_base + reg);
> > +}
> > +
> > +static inline bool cpm_pcie_link_up(struct xilinx_cpm_pcie_port
> > +*port) {
> > + return (pcie_read(port, XILINX_CPM_PCIE_REG_PSCR) &
> > + XILINX_CPM_PCIE_REG_PSCR_LNKUP) ? 1 : 0; }
> > +
> > +/**
> > + * xilinx_cpm_pcie_clear_err_interrupts - Clear Error Interrupts
> > + * @port: PCIe port information
> > + */
> > +static void cpm_pcie_clear_err_interrupts(struct xilinx_cpm_pcie_port
> > +*port) {
> > + unsigned long val = pcie_read(port, XILINX_CPM_PCIE_REG_RPEFR);
> > +
> > + if (val & XILINX_CPM_PCIE_RPEFR_ERR_VALID) {
> > + dev_dbg(port->dev, "Requester ID %lu\n",
> > + val & XILINX_CPM_PCIE_RPEFR_REQ_ID);
> > + pcie_write(port, XILINX_CPM_PCIE_RPEFR_ALL_MASK,
> > + XILINX_CPM_PCIE_REG_RPEFR);
> > + }
> > +}
> > +
> > +static void xilinx_cpm_mask_leg_irq(struct irq_data *data) {
> > + struct irq_desc *desc = irq_to_desc(data->irq);
> > + struct xilinx_cpm_pcie_port *port;
> > + unsigned long flags;
> > + u32 mask;
> > + u32 val;
> > +
> > + port = irq_desc_get_chip_data(desc);
> > + mask = (1 << data->hwirq) << XILINX_CPM_PCIE_IDRN_SHIFT;
> > + raw_spin_lock_irqsave(&port->leg_mask_lock, flags);
> > + val = pcie_read(port, XILINX_CPM_PCIE_REG_IDRN_MASK);
> > + pcie_write(port, (val & (~mask)), XILINX_CPM_PCIE_REG_IDRN_MASK);
> > + raw_spin_unlock_irqrestore(&port->leg_mask_lock, flags); }
> > +
> > +static void xilinx_cpm_unmask_leg_irq(struct irq_data *data) {
> > + struct irq_desc *desc = irq_to_desc(data->irq);
> > + struct xilinx_cpm_pcie_port *port;
> > + unsigned long flags;
> > + u32 mask;
> > + u32 val;
> > +
> > + port = irq_desc_get_chip_data(desc);
> > + mask = (1 << data->hwirq) << XILINX_CPM_PCIE_IDRN_SHIFT;
> > + raw_spin_lock_irqsave(&port->leg_mask_lock, flags);
> > + val = pcie_read(port, XILINX_CPM_PCIE_REG_IDRN_MASK);
> > + pcie_write(port, (val | mask), XILINX_CPM_PCIE_REG_IDRN_MASK);
> > + raw_spin_unlock_irqrestore(&port->leg_mask_lock, flags); }
> > +
> > +static struct irq_chip xilinx_cpm_leg_irq_chip = {
> > + .name = "xilinx_cpm_pcie:legacy",
> > + .irq_enable = xilinx_cpm_unmask_leg_irq,
> > + .irq_disable = xilinx_cpm_mask_leg_irq,
> > + .irq_mask = xilinx_cpm_mask_leg_irq,
> > + .irq_unmask = xilinx_cpm_unmask_leg_irq, };
> > +
> > +/**
> > + * xilinx_cpm_pcie_intx_map - Set the handler for the INTx and mark
> > +IRQ as valid
> > + * @domain: IRQ domain
> > + * @irq: Virtual IRQ number
> > + * @hwirq: HW interrupt number
> > + *
> > + * Return: Always returns 0.
> > + */
> > +static int xilinx_cpm_pcie_intx_map(struct irq_domain *domain,
> > + unsigned int irq, irq_hw_number_t hwirq) {
> > + irq_set_chip_and_handler(irq, &xilinx_cpm_leg_irq_chip,
> > + handle_level_irq);
> > + irq_set_chip_data(irq, domain->host_data);
> > + irq_set_status_flags(irq, IRQ_LEVEL);
> > +
> > + return 0;
> > +}
> > +
> > +/* INTx IRQ Domain operations */
> > +static const struct irq_domain_ops intx_domain_ops = {
> > + .map = xilinx_cpm_pcie_intx_map,
> > +};
> > +
> > +/**
> > + * xilinx_cpm_pcie_intr_handler - Interrupt Service Handler
> > + * @irq: IRQ number
> > + * @data: PCIe port information
> > + *
> > + * Return: IRQ_HANDLED on success and IRQ_NONE on failure */ static
> > +irqreturn_t xilinx_cpm_pcie_intr_handler(int irq, void *data) {
> > + struct xilinx_cpm_pcie_port *port = data;
> > + struct device *dev = port->dev;
> > + u32 val, mask, status, bit;
> > + unsigned long intr_val;
> > +
> > + /* Read interrupt decode and mask registers */
> > + val = pcie_read(port, XILINX_CPM_PCIE_REG_IDR);
> > + mask = pcie_read(port, XILINX_CPM_PCIE_REG_IMR);
> > +
> > + status = val & mask;
> > + if (!status)
> > + return IRQ_NONE;
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_LINK_DOWN)
> > + dev_warn(dev, "Link Down\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_HOT_RESET)
> > + dev_info(dev, "Hot reset\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_CFG_TIMEOUT)
> > + dev_warn(dev, "ECAM access timeout\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_CORRECTABLE) {
> > + dev_warn(dev, "Correctable error message\n");
> > + cpm_pcie_clear_err_interrupts(port);
> > + }
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_NONFATAL) {
> > + dev_warn(dev, "Non fatal error message\n");
> > + cpm_pcie_clear_err_interrupts(port);
> > + }
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_FATAL) {
> > + dev_warn(dev, "Fatal error message\n");
> > + cpm_pcie_clear_err_interrupts(port);
> > + }
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_INTX) {
> > + /* Handle INTx Interrupt */
> > + intr_val = pcie_read(port, XILINX_CPM_PCIE_REG_IDRN);
> > + intr_val = intr_val >> XILINX_CPM_PCIE_IDRN_SHIFT;
> > +
> > + for_each_set_bit(bit, &intr_val, PCI_NUM_INTX)
> > + generic_handle_irq(irq_find_mapping(port-
> >leg_domain,
> > + bit));
> > + }
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_SLV_UNSUPP)
> > + dev_warn(dev, "Slave unsupported request\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_SLV_UNEXP)
> > + dev_warn(dev, "Slave unexpected completion\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_SLV_COMPL)
> > + dev_warn(dev, "Slave completion timeout\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_SLV_ERRP)
> > + dev_warn(dev, "Slave Error Poison\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_SLV_CMPABT)
> > + dev_warn(dev, "Slave Completer Abort\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_SLV_ILLBUR)
> > + dev_warn(dev, "Slave Illegal Burst\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_MST_DECERR)
> > + dev_warn(dev, "Master decode error\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_MST_SLVERR)
> > + dev_warn(dev, "Master slave error\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_CFG_PCIE_TIMEOUT)
> > + dev_warn(dev, "PCIe ECAM access timeout\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_CFG_ERR_POISON)
> > + dev_warn(dev, "ECAM poisoned completion received\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_PME_TO_ACK_RCVD)
> > + dev_warn(dev, "PME_TO_ACK message received\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_PM_PME_RCVD)
> > + dev_warn(dev, "PM_PME message received\n");
> > +
> > + if (status & XILINX_CPM_PCIE_INTR_SLV_PCIE_TIMEOUT)
> > + dev_warn(dev, "PCIe completion timeout received\n");
> > +
> > + /* Clear the Interrupt Decode register */
> > + pcie_write(port, status, XILINX_CPM_PCIE_REG_IDR);
> > +
> > + /*
> > + * XILINX_CPM_PCIE_MISC_IR_STATUS register is mapped to
> > + * CPM SLCR block.
> > + */
> > + val = readl(port->cpm_base + XILINX_CPM_PCIE_MISC_IR_STATUS);
> > + if (val)
> > + writel(val, port->cpm_base +
> XILINX_CPM_PCIE_MISC_IR_STATUS);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +/**
> > + * xilinx_cpm_pcie_init_irq_domain - Initialize IRQ domain
> > + * @port: PCIe port information
> > + *
> > + * Return: '0' on success and error value on failure */ static int
> > +xilinx_cpm_pcie_init_irq_domain(struct xilinx_cpm_pcie_port *port) {
> > + struct device *dev = port->dev;
> > + struct device_node *node = dev->of_node;
> > + struct device_node *pcie_intc_node;
> > +
> > + /* Setup INTx */
> > + pcie_intc_node = of_get_next_child(node, NULL);
> > + if (!pcie_intc_node) {
> > + dev_err(dev, "No PCIe Intc node found\n");
> > + return -EINVAL;
> > + }
> > +
> > + port->leg_domain = irq_domain_add_linear(pcie_intc_node,
> PCI_NUM_INTX,
> > + &intx_domain_ops,
> > + port);
> > + of_node_put(pcie_intc_node);
> > + if (!port->leg_domain) {
> > + dev_err(dev, "Failed to get a INTx IRQ domain\n");
> > + return -ENOMEM;
> > + }
> > +
> > + raw_spin_lock_init(&port->leg_mask_lock);
> > + return 0;
> > +}
> > +
> > +/**
> > + * xilinx_cpm_pcie_init_port - Initialize hardware
> > + * @port: PCIe port information
> > + */
> > +static void xilinx_cpm_pcie_init_port(struct xilinx_cpm_pcie_port
> > +*port) {
> > + if (cpm_pcie_link_up(port))
> > + dev_info(port->dev, "PCIe Link is UP\n");
> > + else
> > + dev_info(port->dev, "PCIe Link is DOWN\n");
> > +
> > + /* Disable all interrupts */
> > + pcie_write(port, ~XILINX_CPM_PCIE_IDR_ALL_MASK,
> > + XILINX_CPM_PCIE_REG_IMR);
> > +
> > + /* Clear pending interrupts */
> > + pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_IDR) &
> > + XILINX_CPM_PCIE_IMR_ALL_MASK,
> > + XILINX_CPM_PCIE_REG_IDR);
> > +
> > + /* Enable all interrupts */
> > + pcie_write(port, XILINX_CPM_PCIE_IMR_ALL_MASK,
> > + XILINX_CPM_PCIE_REG_IMR);
> > + pcie_write(port, XILINX_CPM_PCIE_IDRN_MASK,
> > + XILINX_CPM_PCIE_REG_IDRN_MASK);
> > +
> > + /*
> > + * XILINX_CPM_PCIE_MISC_IR_ENABLE register is mapped to
> > + * CPM SLCR block.
> > + */
> > + writel(XILINX_CPM_PCIE_MISC_IR_LOCAL,
> > + port->cpm_base + XILINX_CPM_PCIE_MISC_IR_ENABLE);
> > + /* Enable the Bridge enable bit */
> > + pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_RPSC) |
> > + XILINX_CPM_PCIE_REG_RPSC_BEN,
> > + XILINX_CPM_PCIE_REG_RPSC);
> > +}
> > +
> > +static int xilinx_cpm_request_misc_irq(struct xilinx_cpm_pcie_port
> > +*port) {
> > + struct device *dev = port->dev;
> > + struct platform_device *pdev = to_platform_device(dev);
> > + int err;
> > +
> > + port->irq_misc = platform_get_irq_byname(pdev, "misc");
> > + if (port->irq_misc <= 0) {
> > + dev_err(dev, "Unable to find misc IRQ line\n");
> > + return port->irq_misc;
> > + }
> > + err = devm_request_irq(dev, port->irq_misc,
> > + xilinx_cpm_pcie_intr_handler,
> > + IRQF_SHARED | IRQF_NO_THREAD,
> > + "xilinx-pcie", port);
> > + if (err) {
> > + dev_err(dev, "unable to request misc IRQ line %d\n",
> > + port->irq_misc);
> > + return err;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * xilinx_cpm_pcie_parse_dt - Parse Device tree
> > + * @port: PCIe port information
> > + * @bus_range: Bus resource
> > + *
> > + * Return: '0' on success and error value on failure */ static int
> > +xilinx_cpm_pcie_parse_dt(struct xilinx_cpm_pcie_port *port,
> > + struct resource *bus_range)
> > +{
> > + struct device *dev = port->dev;
> > + struct platform_device *pdev = to_platform_device(dev);
> > + struct resource *res;
> > + int err;
> > +
> > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
> > + if (res) {
>
> if (!res)
> return -ENXIO;
>
> Less indentation and no need for 'else'.
Agreed, will fix this.
>
> > + port->cfg = pci_ecam_create(dev, res, bus_range,
> > + &pci_generic_ecam_ops);
> > + if (IS_ERR(port->cfg))
> > + return PTR_ERR(port->cfg);
> > + } else {
> > + return -ENXIO;
> > + }
> > + port->reg_base = port->cfg->win;
> > +
> > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > + "cpm_slcr");
> > + if (res) {
> > + port->cpm_base = devm_ioremap_resource(dev, res);
>
> Use devm_platform_ioremap_resource_byname()
Agreed, will use this.
>
> > + if (IS_ERR(port->cpm_base))
> > + return PTR_ERR(port->cpm_base);
> > + } else {
> > + return -ENXIO;
> > + }
> > +
> > + err = xilinx_cpm_request_misc_irq(port);
> > + if (err)
> > + return err;
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * xilinx_cpm_pcie_probe - Probe function
> > + * @pdev: Platform device pointer
> > + *
> > + * Return: '0' on success and error value on failure */ static int
> > +xilinx_cpm_pcie_probe(struct platform_device *pdev) {
> > + struct xilinx_cpm_pcie_port *port;
> > + struct device *dev = &pdev->dev;
> > + struct pci_bus *bus;
> > + struct pci_bus *child;
> > + struct pci_host_bridge *bridge;
> > + struct resource *bus_range;
> > + int err;
> > +
> > + bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
> > + if (!bridge)
> > + return -ENODEV;
> > +
> > + port = pci_host_bridge_priv(bridge);
> > +
> > + port->dev = dev;
> > +
> > + err = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
> > + &bridge->dma_ranges,
> &bus_range);
> > + if (err) {
> > + dev_err(dev, "Getting bridge resources failed\n");
> > + return err;
> > + }
> > +
> > + err = xilinx_cpm_pcie_parse_dt(port, bus_range);
> > + if (err) {
> > + dev_err(dev, "Parsing DT failed\n");
> > + return err;
> > + }
> > +
> > + xilinx_cpm_pcie_init_port(port);
> > +
> > + err = xilinx_cpm_pcie_init_irq_domain(port);
> > + if (err) {
> > + dev_err(dev, "Failed creating IRQ Domain\n");
> > + return err;
> > + }
> > +
> > + bridge->dev.parent = dev;
> > + bridge->sysdata = port->cfg;
> > + bridge->busnr = port->root_busno;
> > + bridge->ops = &pci_generic_ecam_ops.pci_ops;
> > + bridge->map_irq = of_irq_parse_and_map_pci;
> > + bridge->swizzle_irq = pci_common_swizzle;
> > +
>
>
> > + err = pci_scan_root_bus_bridge(bridge);
> > + if (err) {
> > + irq_domain_remove(port->leg_domain);
> > + devm_free_irq(dev, port->irq_misc, port);
> > + return err;
> > + }
> > +
> > + bus = bridge->bus;
> > +
> > + pci_assign_unassigned_bus_resources(bus);
> > + list_for_each_entry(child, &bus->children, node)
> > + pcie_bus_configure_settings(child);
> > + pci_bus_add_devices(bus);
>
> All this can use pci_host_probe().
Agreed will use this API.
>
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id xilinx_cpm_pcie_of_match[] = {
> > + { .compatible = "xlnx,versal-cpm-host-1.00", },
> > + {}
> > +};
> > +
> > +static struct platform_driver xilinx_cpm_pcie_driver = {
> > + .driver = {
> > + .name = "xilinx-cpm-pcie",
> > + .of_match_table = xilinx_cpm_pcie_of_match,
> > + .suppress_bind_attrs = true,
> > + },
> > + .probe = xilinx_cpm_pcie_probe,
> > +};
> > +
> > +builtin_platform_driver(xilinx_cpm_pcie_driver);
> > --
> > 2.7.4
> >
