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SubjectRe: [PATCH v3] pcie: Add Xilinx PCIe Host Bridge IP driver
From
Hi,

Kindly review the driver and please let me know if you have any comments.

Thanks
Srikanth

On Tue, Apr 15, 2014 at 5:08 PM, Srikanth Thokala <sthokal@xilinx.com> wrote:
> This is the driver for Xilinx AXI PCIe Host Bridge Soft IP
>
> Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
> ---
> Changes in v3:
> - Rebased on v3.15.0-rc1
> - Added support for interrupt-map DT functionality.
> - Removed map_irq() wrapper, instead using of_irq_parse_and_map_pci().
> - Modified resource mapping logic as per the series
> "PCI: ARM: add support for generic PCI host controller"
> - Modified devicetree binding documentation to update with interrupt-
> map properties.
> - Use devm calls wherever applicable.
> - Fixed minor comments from Jason
> - Thanks Jason for the review and suggestions.
>
> Changes in v2:
> - Rebased on v3.14.0-rc8
> - Removed IP specific DT properties like include-rc, axibar-num etc.,
> as suggested by Jason and Bjorn, Thanks
> ---
> .../devicetree/bindings/pci/xilinx-pcie.txt | 62 ++
> drivers/pci/host/Kconfig | 7 +
> drivers/pci/host/Makefile | 1 +
> drivers/pci/host/pci-xilinx.c | 999 ++++++++++++++++++++
> 4 files changed, 1069 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pci/xilinx-pcie.txt
> create mode 100644 drivers/pci/host/pci-xilinx.c
>
> diff --git a/Documentation/devicetree/bindings/pci/xilinx-pcie.txt b/Documentation/devicetree/bindings/pci/xilinx-pcie.txt
> new file mode 100644
> index 0000000..2fb28e0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/xilinx-pcie.txt
> @@ -0,0 +1,62 @@
> +* Xilinx AXI PCIe Root Port Bridge DT description
> +
> +Required properties:
> +- #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.
> +- compatible: Should contain "xlnx,axi-pcie-host-1.00.a"
> +- reg: Should contain AXI PCIe registers location and length
> +- device_type: must be "pci"
> +- interrupts: Should contain AXI PCIe interrupt
> +- interrupt-map-mask,
> + 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 noti
> + supported by hardware)
> + Please refer to the standard PCI bus binding document for a more
> + detailed explanation
> +
> +Optional properties:
> +- bus-range: PCI bus numbers covered
> +
> +Interrupt controller child node
> ++++++++++++++++++++++++++++++++
> +Required properties:
> +- interrupt-controller: identifies the node as an interrupt controller
> +- #address-cells: specifies the number of cells needed to encode an
> + address. The value must be 0.
> +- #interrupt-cells: specifies the number of cells needed to encode an
> + interrupt source. The value must be 1.
> +
> +NOTE:
> +The core provides a single interrupt for both INTx/MSI messages. So,
> +created a interrupt controller node to support 'interrupt-map' DT
> +functionality. The driver will create an IRQ domain for this map, decode
> +the four INTx interrupts in ISR and route them to this domain.
> +
> +
> +Example:
> +++++++++
> +
> + pci_express: axi-pcie@50000000 {
> + #address-cells = <3>;
> + #size-cells = <2>;
> + #interrupt-cells = <1>;
> + compatible = "xlnx,axi-pcie-host-1.00.a";
> + reg = < 0x50000000 0x10000000 >;
> + device_type = "pci";
> + interrupts = < 0 52 4 >;
> + interrupt-map-mask = <0 0 0 7>;
> + interrupt-map = <0 0 0 1 &pcie_intc 1>,
> + <0 0 0 2 &pcie_intc 2>,
> + <0 0 0 3 &pcie_intc 3>,
> + <0 0 0 4 &pcie_intc 4>;
> + ranges = < 0x02000000 0 0x60000000 0x60000000 0 0x10000000 >;
> +
> + pcie_intc: interrupt-controller {
> + interrupt-controller;
> + #address-cells = <0>;
> + #interrupt-cells = <1>;
> + }
> + };
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index a6f67ec..71afdcd 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -33,4 +33,11 @@ config PCI_RCAR_GEN2
> There are 3 internal PCI controllers available with a single
> built-in EHCI/OHCI host controller present on each one.
>
> +config PCI_XILINX
> + bool "Xilinx AXI PCIe host bridge support"
> + depends on ARCH_ZYNQ
> + help
> + Say 'Y' here if you want kernel to support the Xilinx AXI PCIe
> + Host Bridge driver.
> +
> endmenu
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> index 13fb333..4e9c843 100644
> --- a/drivers/pci/host/Makefile
> +++ b/drivers/pci/host/Makefile
> @@ -4,3 +4,4 @@ obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
> obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
> obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
> obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
> +obj-$(CONFIG_PCI_XILINX) += pci-xilinx.o
> diff --git a/drivers/pci/host/pci-xilinx.c b/drivers/pci/host/pci-xilinx.c
> new file mode 100644
> index 0000000..d9afe66
> --- /dev/null
> +++ b/drivers/pci/host/pci-xilinx.c
> @@ -0,0 +1,999 @@
> +/*
> + * PCIe host controller driver for Xilinx AXI PCIe Bridge
> + *
> + * Copyright (c) 2012 - 2014 Xilinx, Inc.
> + *
> + * Based on the Tegra PCIe driver
> + *
> + * Bits taken from Synopsys Designware Host controller driver and
> + * ARM PCI Host generic driver.
> + *
> + * 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/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>
> +
> +/* Register definitions */
> +#define XILINX_PCIE_REG_VSECC 0x00000128
> +#define XILINX_PCIE_REG_VSECH 0x0000012c
> +#define XILINX_PCIE_REG_BIR 0x00000130
> +#define XILINX_PCIE_REG_BSCR 0x00000134
> +#define XILINX_PCIE_REG_IDR 0x00000138
> +#define XILINX_PCIE_REG_IMR 0x0000013c
> +#define XILINX_PCIE_REG_BLR 0x00000140
> +#define XILINX_PCIE_REG_PSCR 0x00000144
> +#define XILINX_PCIE_REG_RPSC 0x00000148
> +#define XILINX_PCIE_REG_MSIBASE1 0x0000014c
> +#define XILINX_PCIE_REG_MSIBASE2 0x00000150
> +#define XILINX_PCIE_REG_RPEFR 0x00000154
> +#define XILINX_PCIE_REG_RPIFR1 0x00000158
> +#define XILINX_PCIE_REG_RPIFR2 0x0000015c
> +#define XILINX_PCIE_REG_VSECC2 0x00000200
> +#define XILINX_PCIE_REG_VSECH2 0x00000204
> +
> +/* Interrupt registers definitions */
> +#define XILINX_PCIE_INTR_LINK_DOWN BIT(0)
> +#define XILINX_PCIE_INTR_ECRC_ERR BIT(1)
> +#define XILINX_PCIE_INTR_STR_ERR BIT(2)
> +#define XILINX_PCIE_INTR_HOT_RESET BIT(3)
> +#define XILINX_PCIE_INTR_CFG_COMPL GENMASK(7, 5)
> +#define XILINX_PCIE_INTR_CFG_TIMEOUT BIT(8)
> +#define XILINX_PCIE_INTR_CORRECTABLE BIT(9)
> +#define XILINX_PCIE_INTR_NONFATAL BIT(10)
> +#define XILINX_PCIE_INTR_FATAL BIT(11)
> +#define XILINX_PCIE_INTR_INTX BIT(16)
> +#define XILINX_PCIE_INTR_MSI BIT(17)
> +#define XILINX_PCIE_INTR_SLV_UNSUPP BIT(20)
> +#define XILINX_PCIE_INTR_SLV_UNEXP BIT(21)
> +#define XILINX_PCIE_INTR_SLV_COMPL BIT(22)
> +#define XILINX_PCIE_INTR_SLV_ERRP BIT(23)
> +#define XILINX_PCIE_INTR_SLV_CMPABT BIT(24)
> +#define XILINX_PCIE_INTR_SLV_ILLBUR BIT(25)
> +#define XILINX_PCIE_INTR_MST_DECERR BIT(26)
> +#define XILINX_PCIE_INTR_MST_SLVERR BIT(27)
> +#define XILINX_PCIE_INTR_MST_ERRP BIT(28)
> +#define XILINX_PCIE_IMR_ALL_MASK 0x1FF30FED
> +#define XILINX_PCIE_IDR_ALL_MASK 0xFFFFFFFF
> +
> +/* Root Port Error FIFO Read Register definitions */
> +#define XILINX_PCIE_RPEFR_ERR_VALID BIT(18)
> +#define XILINX_PCIE_RPEFR_REQ_ID GENMASK(15, 0)
> +#define XILINX_PCIE_RPEFR_ALL_MASK 0xFFFFFFFF
> +
> +/* Root Port Interrupt FIFO Read Register 1 definitions */
> +#define XILINX_PCIE_RPIFR1_INTR_VALID BIT(31)
> +#define XILINX_PCIE_RPIFR1_MSI_INTR BIT(30)
> +#define XILINX_PCIE_RPIFR1_INTR_ASSRT BIT(29)
> +#define XILINX_PCIE_RPIFR1_INTR_MASK GENMASK(28, 27)
> +#define XILINX_PCIE_RPIFR1_MSI_ADR_MASK GENMASK(26, 16)
> +#define XILINX_PCIE_RPIFR1_ALL_MASK 0xFFFFFFFF
> +#define XILINX_PCIE_RPIFR1_INTR_SHIFT 27
> +#define XILINX_PCIE_RPIFR1_MSI_ADR_SHIFT 16
> +
> +/* Bridge Info Register definitions */
> +#define XILINX_PCIE_BIR_ECAM_SZ_MASK GENMASK(18, 16)
> +#define XILINX_PCIE_BIR_ECAM_SZ_SHIFT 16
> +
> +/* Root Port Interrupt FIFO Read Register 2 definitions */
> +#define XILINX_PCIE_RPIFR2_MSG_DATA GENMASK(15, 0)
> +
> +/* Root Port Status/control Register definitions */
> +#define XILINX_PCIE_REG_RPSC_BEN BIT(0)
> +
> +/* Phy Status/Control Register definitions */
> +#define XILINX_PCIE_REG_PSCR_LNKUP BIT(11)
> +
> +/* ECAM definitions */
> +#define ECAM_BUS_NUM_SHIFT 20
> +#define ECAM_DEV_NUM_SHIFT 12
> +
> +/* PCI Configuration space Bus Number Register definitions */
> +#define PCI_SECONDARY_BUS_NUM_SHIFT 8
> +#define PCI_SUBORDINATE_BUS_NUM_SHIFT 16
> +#define PCI_LATENCY_TIMER_MASK GENMASK(31, 24)
> +
> +/* Number of MSI IRQs */
> +#define XILINX_NUM_MSI_IRQS 128
> +
> +/* Number of Memory Resources */
> +#define XILINX_MAX_NUM_RESOURCES 3
> +
> +/**
> + * struct xilinx_pcie_port - PCIe port information
> + * @reg_base: IO Mapped Register Base
> + * @irq: Interrupt number
> + * @msg_addr: MSI message address
> + * @root_busno: Root Bus number
> + * @link_up: Link status flag
> + * @dev: Device pointer
> + * @irq_domain: IRQ domain pointer
> + */
> +struct xilinx_pcie_port {
> + void __iomem *reg_base;
> + u32 irq;
> + unsigned long msg_addr;
> + u8 root_busno;
> + bool link_up;
> + struct device *dev;
> + struct irq_domain *irq_domain;
> +};
> +
> +static DECLARE_BITMAP(msi_irq_in_use, XILINX_NUM_MSI_IRQS);
> +
> +static inline struct xilinx_pcie_port *sys_to_pcie(struct pci_sys_data *sys)
> +{
> + return sys->private_data;
> +}
> +
> +static inline u32 pcie_read(struct xilinx_pcie_port *port, u32 reg)
> +{
> + return readl(port->reg_base + reg);
> +}
> +
> +static inline void pcie_write(struct xilinx_pcie_port *port,
> + u32 val, u32 reg)
> +{
> + writel(val, port->reg_base + reg);
> +}
> +
> +static inline bool xilinx_pcie_is_link_up(struct xilinx_pcie_port *port)
> +{
> + return (pcie_read(port, XILINX_PCIE_REG_PSCR) &
> + XILINX_PCIE_REG_PSCR_LNKUP) ? 1 : 0;
> +}
> +
> +/**
> + * xilinx_pcie_clear_err_interrupts - Clear Error Interrupts
> + * @port: PCIe port information
> + */
> +static inline void
> +xilinx_pcie_clear_err_interrupts(struct xilinx_pcie_port *port)
> +{
> + u32 val = pcie_read(port, XILINX_PCIE_REG_RPEFR);
> +
> + if (val & XILINX_PCIE_RPEFR_ERR_VALID) {
> + dev_dbg(port->dev, "Requester ID %d\n",
> + val & XILINX_PCIE_RPEFR_REQ_ID);
> + pcie_write(port, XILINX_PCIE_RPEFR_ALL_MASK,
> + XILINX_PCIE_REG_RPEFR);
> + }
> +}
> +
> +/**
> + * xilinx_pcie_verify_config - Verify configuration
> + * @bus: Bus structure of current bus
> + * @devfn: device/function
> + *
> + * Return: 0 on success and PCIBIOS_DEVICE_NOT_FOUND on error
> + */
> +static int xilinx_pcie_verify_config(struct pci_bus *bus,
> + unsigned int devfn)
> +{
> + struct xilinx_pcie_port *port = sys_to_pcie(bus->sysdata);
> +
> + /* Check if link is up when trying to access downstream ports */
> + if (bus->number != port->root_busno)
> + if (!xilinx_pcie_is_link_up(port))
> + return 0;
> +
> + /* Only one device down on each root port */
> + if (bus->number == port->root_busno && devfn > 0)
> + return 0;
> +
> + /*
> + * Do not read more than one device on the bus directly attached
> + * to RC.
> + */
> + if (bus->primary == port->root_busno && devfn > 0)
> + return 0;
> +
> + return 1;
> +}
> +
> +/**
> + * xilinx_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 *xilinx_pcie_get_config_base(struct pci_bus *bus,
> + unsigned int devfn,
> + int where)
> +{
> + struct xilinx_pcie_port *port = sys_to_pcie(bus->sysdata);
> + int relbus;
> +
> + relbus = (bus->number << ECAM_BUS_NUM_SHIFT) |
> + (devfn << ECAM_DEV_NUM_SHIFT);
> +
> + return port->reg_base + relbus + where;
> +}
> +
> +/**
> + * xilinx_pcie_read_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
> + * EINVAL/PCIBIOS_DEVICE_NOT_FOUND/PCIBIOS_BAD_REGISTER_NUMBER
> + * on failure.
> + */
> +static int xilinx_pcie_read_config(struct pci_bus *bus,
> + unsigned int devfn, int where,
> + int size, u32 *val)
> +{
> + struct xilinx_pcie_port *port = sys_to_pcie(bus->sysdata);
> + void __iomem *addr;
> +
> + if (!port) {
> + BUG();
> + return -EINVAL;
> + }
> +
> + if (!xilinx_pcie_verify_config(bus, devfn)) {
> + *val = 0xFFFFFFFF;
> + return PCIBIOS_DEVICE_NOT_FOUND;
> + }
> +
> + addr = xilinx_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;
> +}
> +
> +/**
> + * xilinx_pcie_write_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,
> + * EINVAL/PCIBIOS_DEVICE_NOT_FOUND/PCIBIOS_BAD_REGISTER_NUMBER
> + * on failure.
> + */
> +static int xilinx_pcie_write_config(struct pci_bus *bus,
> + unsigned int devfn, int where,
> + int size, u32 val)
> +{
> + struct xilinx_pcie_port *port = sys_to_pcie(bus->sysdata);
> + void __iomem *addr;
> +
> + if (!port) {
> + BUG();
> + return -EINVAL;
> + }
> +
> + if (!xilinx_pcie_verify_config(bus, devfn))
> + return PCIBIOS_DEVICE_NOT_FOUND;
> +
> + addr = xilinx_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;
> + }
> +
> + return PCIBIOS_SUCCESSFUL;
> +}
> +
> +/* PCIe operations */
> +static struct pci_ops xilinx_pcie_ops = {
> + .read = xilinx_pcie_read_config,
> + .write = xilinx_pcie_write_config,
> +};
> +
> +/* MSI functions */
> +
> +/**
> + * xilinx_pcie_destroy_msi - Free MSI number
> + * @irq: IRQ to be freed
> + */
> +static void xilinx_pcie_destroy_msi(unsigned int irq)
> +{
> + struct irq_desc *desc;
> + struct msi_desc *msi;
> + struct xilinx_pcie_port *port;
> +
> + desc = irq_to_desc(irq);
> + msi = irq_desc_get_msi_desc(desc);
> + port = sys_to_pcie(msi->dev->bus->sysdata);
> + if (!port) {
> + BUG();
> + return;
> + }
> +
> + if (!test_bit(irq, msi_irq_in_use))
> + dev_err(port->dev, "Trying to free unused MSI#%d\n", irq);
> + else
> + clear_bit(irq, msi_irq_in_use);
> +}
> +
> +/**
> + * xilinx_pcie_assign_msi - Allocate MSI number
> + * @port: PCIe port structure
> + *
> + * Return: A valid IRQ on success and error value on failure.
> + */
> +static int xilinx_pcie_assign_msi(struct xilinx_pcie_port *port)
> +{
> + int pos;
> +
> + pos = find_first_zero_bit(msi_irq_in_use, XILINX_NUM_MSI_IRQS);
> + if (pos < XILINX_NUM_MSI_IRQS)
> + set_bit(pos, msi_irq_in_use);
> + else
> + return -ENOSPC;
> +
> + return irq_find_mapping(port->irq_domain, pos);
> +}
> +
> +/**
> + * xilinx_msi_teardown_irq - Destroy the MSI
> + * @chip: MSI Chip descriptor
> + * @irq: MSI IRQ to destroy
> + */
> +static void xilinx_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
> +{
> + xilinx_pcie_destroy_msi(irq);
> +}
> +
> +/**
> + * xilinx_pcie_msi_setup_irq - Setup MSI request
> + * @chip: MSI chip pointer
> + * @pdev: PCIe device pointer
> + * @desc: MSI descriptor pointer
> + *
> + * Return: '0' on success and error value on failure
> + */
> +static int xilinx_pcie_msi_setup_irq(struct msi_chip *chip,
> + struct pci_dev *pdev,
> + struct msi_desc *desc)
> +{
> + struct xilinx_pcie_port *port = sys_to_pcie(pdev->bus->sysdata);
> + int irq;
> + struct msi_msg msg;
> +
> + if (!port) {
> + BUG();
> + return -EINVAL;
> + }
> +
> + irq = xilinx_pcie_assign_msi(port);
> + if (irq < 0)
> + return irq;
> +
> + irq_set_msi_desc(irq, desc);
> +
> + msg.address_hi = 0;
> + msg.address_lo = virt_to_phys((void *)port->msg_addr);
> + msg.data = irq;
> +
> + write_msi_msg(irq, &msg);
> +
> + return 0;
> +}
> +
> +/* MSI Chip Descriptor */
> +static struct msi_chip xilinx_pcie_msi_chip = {
> + .setup_irq = xilinx_pcie_msi_setup_irq,
> + .teardown_irq = xilinx_msi_teardown_irq,
> +};
> +
> +/* HW Interrupt Chip Descriptor */
> +static struct irq_chip xilinx_msi_irq_chip = {
> + .name = "Xilinx PCIe MSI",
> + .irq_enable = unmask_msi_irq,
> + .irq_disable = mask_msi_irq,
> + .irq_mask = mask_msi_irq,
> + .irq_unmask = unmask_msi_irq,
> +};
> +
> +/**
> + * xilinx_pcie_msi_map - Set the handler for the MSI and mark IRQ as valid
> + * @domain: IRQ domain
> + * @irq: Virtual IRQ number
> + * @hwirq: HW interrupt number
> + *
> + * Return: Always returns 0.
> + */
> +static int xilinx_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
> + irq_hw_number_t hwirq)
> +{
> + irq_set_chip_and_handler(irq, &xilinx_msi_irq_chip, handle_simple_irq);
> + irq_set_chip_data(irq, domain->host_data);
> + set_irq_flags(irq, IRQF_VALID);
> +
> + return 0;
> +}
> +
> +/* IRQ Domain operations */
> +static const struct irq_domain_ops msi_domain_ops = {
> + .map = xilinx_pcie_msi_map,
> +};
> +
> +/**
> + * xilinx_pcie_enable_msi - Enable MSI support
> + * @port: PCIe port information
> + */
> +static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> +{
> + port->msg_addr = __get_free_pages(GFP_KERNEL, 0);
> +
> + pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
> + pcie_write(port, virt_to_phys((void *)port->msg_addr),
> + XILINX_PCIE_REG_MSIBASE2);
> +}
> +
> +/**
> + * xilinx_pcie_add_bus - Add MSI chip info to PCIe bus
> + * @bus: PCIe bus
> + */
> +static void xilinx_pcie_add_bus(struct pci_bus *bus)
> +{
> + if (IS_ENABLED(CONFIG_PCI_MSI)) {
> + struct xilinx_pcie_port *port = sys_to_pcie(bus->sysdata);
> +
> + if (!port)
> + return;
> +
> + xilinx_pcie_msi_chip.dev = port->dev;
> + bus->msi = &xilinx_pcie_msi_chip;
> + }
> +}
> +
> +/* INTx Functions */
> +
> +/**
> + * xilinx_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_pcie_intx_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);
> + set_irq_flags(irq, IRQF_VALID);
> +
> + return 0;
> +}
> +
> +/* INTx IRQ Domain operations */
> +static const struct irq_domain_ops intx_domain_ops = {
> + .map = xilinx_pcie_intx_map,
> +};
> +
> +/* PCIe HW Functions */
> +
> +/**
> + * xilinx_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_pcie_intr_handler(int irq, void *data)
> +{
> + struct xilinx_pcie_port *port = (struct xilinx_pcie_port *)data;
> + u32 val, mask, status, msi_data;
> +
> + /* Read interrupt decode and mask registers */
> + val = pcie_read(port, XILINX_PCIE_REG_IDR);
> + mask = pcie_read(port, XILINX_PCIE_REG_IMR);
> +
> + status = val & mask;
> + if (!status)
> + return IRQ_NONE;
> +
> + if (status & XILINX_PCIE_INTR_LINK_DOWN)
> + dev_warn(port->dev, "Link Down\n");
> +
> + if (status & XILINX_PCIE_INTR_ECRC_ERR)
> + dev_warn(port->dev, "ECRC failed\n");
> +
> + if (status & XILINX_PCIE_INTR_STR_ERR)
> + dev_warn(port->dev, "Streaming error\n");
> +
> + if (status & XILINX_PCIE_INTR_HOT_RESET)
> + dev_info(port->dev, "Hot reset\n");
> +
> + if (status & XILINX_PCIE_INTR_CFG_TIMEOUT)
> + dev_warn(port->dev, "ECAM access timeout\n");
> +
> + if (status & XILINX_PCIE_INTR_CORRECTABLE) {
> + dev_warn(port->dev, "Correctable error message\n");
> + xilinx_pcie_clear_err_interrupts(port);
> + }
> +
> + if (status & XILINX_PCIE_INTR_NONFATAL) {
> + dev_warn(port->dev, "Non fatal error message\n");
> + xilinx_pcie_clear_err_interrupts(port);
> + }
> +
> + if (status & XILINX_PCIE_INTR_FATAL) {
> + dev_warn(port->dev, "Fatal error message\n");
> + xilinx_pcie_clear_err_interrupts(port);
> + }
> +
> + if (status & XILINX_PCIE_INTR_INTX) {
> + /* INTx interrupt received */
> + val = pcie_read(port, XILINX_PCIE_REG_RPIFR1);
> +
> + /* Check whether interrupt valid */
> + if (!(val & XILINX_PCIE_RPIFR1_INTR_VALID)) {
> + dev_warn(port->dev, "RP Intr FIFO1 read error\n");
> + return IRQ_HANDLED;
> + }
> +
> + /* Clear interrupt FIFO register 1 */
> + pcie_write(port, XILINX_PCIE_RPIFR1_ALL_MASK,
> + XILINX_PCIE_REG_RPIFR1);
> +
> + /* Handle INTx Interrupt */
> + val = ((val & XILINX_PCIE_RPIFR1_INTR_MASK) >>
> + XILINX_PCIE_RPIFR1_INTR_SHIFT) + 1;
> + generic_handle_irq(irq_find_mapping(port->irq_domain, val));
> + }
> +
> + if (status & XILINX_PCIE_INTR_MSI) {
> + /* MSI Interrupt */
> + val = pcie_read(port, XILINX_PCIE_REG_RPIFR1);
> +
> + if (!(val & XILINX_PCIE_RPIFR1_INTR_VALID)) {
> + dev_warn(port->dev, "RP Intr FIFO1 read error\n");
> + return IRQ_HANDLED;
> + }
> +
> + if (val & XILINX_PCIE_RPIFR1_MSI_INTR) {
> + msi_data = pcie_read(port, XILINX_PCIE_REG_RPIFR2) &
> + XILINX_PCIE_RPIFR2_MSG_DATA;
> +
> + /* Clear interrupt FIFO register 1 */
> + pcie_write(port, XILINX_PCIE_RPIFR1_ALL_MASK,
> + XILINX_PCIE_REG_RPIFR1);
> +
> + if (IS_ENABLED(CONFIG_PCI_MSI)) {
> + /* Handle MSI Interrupt */
> + generic_handle_irq(msi_data);
> + }
> + }
> + }
> +
> + if (status & XILINX_PCIE_INTR_SLV_UNSUPP)
> + dev_warn(port->dev, "Slave unsupported request\n");
> +
> + if (status & XILINX_PCIE_INTR_SLV_UNEXP)
> + dev_warn(port->dev, "Slave unexpected completion\n");
> +
> + if (status & XILINX_PCIE_INTR_SLV_COMPL)
> + dev_warn(port->dev, "Slave completion timeout\n");
> +
> + if (status & XILINX_PCIE_INTR_SLV_ERRP)
> + dev_warn(port->dev, "Slave Error Poison\n");
> +
> + if (status & XILINX_PCIE_INTR_SLV_CMPABT)
> + dev_warn(port->dev, "Slave Completer Abort\n");
> +
> + if (status & XILINX_PCIE_INTR_SLV_ILLBUR)
> + dev_warn(port->dev, "Slave Illegal Burst\n");
> +
> + if (status & XILINX_PCIE_INTR_MST_DECERR)
> + dev_warn(port->dev, "Master decode error\n");
> +
> + if (status & XILINX_PCIE_INTR_MST_SLVERR)
> + dev_warn(port->dev, "Master slave error\n");
> +
> + if (status & XILINX_PCIE_INTR_MST_ERRP)
> + dev_warn(port->dev, "Master error poison\n");
> +
> + /* Clear the Interrupt Decode register */
> + pcie_write(port, status, XILINX_PCIE_REG_IDR);
> +
> + return IRQ_HANDLED;
> +}
> +
> +/**
> + * xilinx_pcie_free_irq_domain - Free IRQ domain
> + * @port: PCIe port information
> + */
> +static void xilinx_pcie_free_irq_domain(struct xilinx_pcie_port *port)
> +{
> + int i;
> + u32 irq, num_irqs;
> +
> + /* Free IRQ Domain */
> + if (IS_ENABLED(CONFIG_PCI_MSI)) {
> + free_pages(port->msg_addr, 0);
> +
> + num_irqs = XILINX_NUM_MSI_IRQS;
> + } else {
> + /* INTx */
> + num_irqs = 4;
> + }
> +
> + for (i = 0; i < num_irqs; i++) {
> + irq = irq_find_mapping(port->irq_domain, i);
> + if (irq > 0)
> + irq_dispose_mapping(irq);
> + }
> +
> + irq_domain_remove(port->irq_domain);
> +}
> +
> +/**
> + * xilinx_pcie_init_irq_domain - Initialize IRQ domain
> + * @port: PCIe port information
> + *
> + * Return: '0' on success and error value on failure
> + */
> +static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> +{
> + struct device *dev = port->dev;
> + struct device_node *node = dev->of_node;
> +
> + if (IS_ENABLED(CONFIG_PCI_MSI)) {
> + /* Setup MSI */
> + int i;
> +
> + port->irq_domain = irq_domain_add_linear(node,
> + XILINX_NUM_MSI_IRQS,
> + &msi_domain_ops,
> + &xilinx_pcie_msi_chip);
> + if (!port->irq_domain) {
> + dev_err(dev, "Failed to get a MSI IRQ domain\n");
> + return PTR_ERR(port->irq_domain);
> + }
> +
> + for (i = 0; i < XILINX_NUM_MSI_IRQS; i++)
> + irq_create_mapping(port->irq_domain, i);
> +
> + xilinx_pcie_enable_msi(port);
> + } else {
> + /* Setup INTx */
> + struct device_node *pcie_intc_node =
> + of_get_next_child(node, NULL);
> +
> + if (!pcie_intc_node) {
> + dev_err(dev, "No PCIe Intc node found\n");
> + return PTR_ERR(pcie_intc_node);
> + }
> +
> + port->irq_domain = irq_domain_add_linear(pcie_intc_node, 4,
> + &intx_domain_ops,
> + port);
> + if (!port->irq_domain) {
> + dev_err(dev, "Failed to get a INTx IRQ domain\n");
> + return PTR_ERR(port->irq_domain);
> + }
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * xilinx_pcie_init_port - Initialize hardware
> + * @port: PCIe port information
> + */
> +static void xilinx_pcie_init_port(struct xilinx_pcie_port *port)
> +{
> + /* Check if PCIe link is up? */
> + port->link_up = xilinx_pcie_is_link_up(port);
> + if (!port->link_up)
> + dev_info(port->dev, "PCIe Link is DOWN\n");
> + else
> + dev_info(port->dev, "PCIe Link is UP\n");
> +
> + /* Disable all interrupts*/
> + pcie_write(port, ~XILINX_PCIE_IDR_ALL_MASK,
> + XILINX_PCIE_REG_IMR);
> +
> + /* Clear pending interrupts */
> + pcie_write(port, pcie_read(port, XILINX_PCIE_REG_IDR) &
> + XILINX_PCIE_IMR_ALL_MASK,
> + XILINX_PCIE_REG_IDR);
> +
> + /* Enable all interrupts*/
> + pcie_write(port, XILINX_PCIE_IMR_ALL_MASK, XILINX_PCIE_REG_IMR);
> +
> + /* Enable the Bridge enable bit */
> + pcie_write(port, pcie_read(port, XILINX_PCIE_REG_RPSC) |
> + XILINX_PCIE_REG_RPSC_BEN,
> + XILINX_PCIE_REG_RPSC);
> +}
> +
> +/**
> + * xilinx_pcie_setup - Setup memory resources
> + * @nr: Bus number
> + * @sys: Per controller structure
> + *
> + * Return: '1' on success and error value on failure
> + */
> +static int xilinx_pcie_setup(int nr, struct pci_sys_data *sys)
> +{
> + struct xilinx_pcie_port *port = sys_to_pcie(sys);
> + struct device *dev = port->dev;
> + struct device_node *node = dev->of_node;
> + struct resource *mem;
> + resource_size_t offset;
> + struct of_pci_range_parser parser;
> + struct of_pci_range range;
> + struct pci_host_bridge_window *win;
> + int err = 0, mem_resno = 0;
> +
> + /* Get the ranges */
> + if (of_pci_range_parser_init(&parser, node)) {
> + dev_err(dev, "missing \"ranges\" property\n");
> + return -EINVAL;
> + }
> +
> + /* Parse the ranges and add the resources found to the list */
> + for_each_of_pci_range(&parser, &range) {
> +
> + if (mem_resno >= XILINX_MAX_NUM_RESOURCES) {
> + dev_err(dev, "Maximum memory resources exceeded\n");
> + return -EINVAL;
> + }
> +
> + mem = devm_kmalloc(dev, sizeof(*mem), GFP_KERNEL);
> + if (!mem) {
> + err = -ENOMEM;
> + goto free_resources;
> + }
> +
> + of_pci_range_to_resource(&range, node, mem);
> +
> + switch (mem->flags & IORESOURCE_TYPE_BITS) {
> + case IORESOURCE_MEM:
> + offset = range.cpu_addr - range.pci_addr;
> + mem_resno++;
> + break;
> + default:
> + err = -EINVAL;
> + break;
> + }
> +
> + if (err < 0) {
> + dev_warn(dev, "Invalid resource found\n");
> + continue;
> + }
> +
> + err = request_resource(&iomem_resource, mem);
> + if (err)
> + goto free_resources;
> +
> + pci_add_resource_offset(&sys->resources, mem, offset);
> + }
> +
> + return 1;
> +
> +free_resources:
> + release_child_resources(&iomem_resource);
> + list_for_each_entry(win, &sys->resources, list)
> + devm_kfree(dev, win->res);
> + pci_free_resource_list(&sys->resources);
> +
> + return err;
> +}
> +
> +/**
> + * xilinx_pcie_scan_bus - Scan PCIe bus for devices
> + * @nr: Bus number
> + * @sys: Per controller structure
> + *
> + * Return: Valid Bus pointer on success and NULL on failure
> + */
> +static struct pci_bus __init *xilinx_pcie_scan_bus(int nr,
> + struct pci_sys_data *sys)
> +{
> + struct xilinx_pcie_port *port = sys_to_pcie(sys);
> + struct pci_bus *bus;
> +
> + if (port) {
> + port->root_busno = sys->busnr;
> + bus = pci_scan_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops,
> + sys, &sys->resources);
> + } else {
> + bus = NULL;
> + BUG();
> + }
> +
> + return bus;
> +}
> +
> +/**
> + * xilinx_pcie_parse_dt - Parse Device tree
> + * @port: PCIe port information
> + *
> + * Return: '0' on success and error value on failure
> + */
> +static int xilinx_pcie_parse_dt(struct xilinx_pcie_port *port)
> +{
> + struct device *dev = port->dev;
> + struct device_node *node = dev->of_node;
> + struct resource regs, busn;
> + const char *type;
> + int err;
> +
> + /* Check for device type */
> + type = of_get_property(node, "device_type", NULL);
> + if (!type || strcmp(type, "pci")) {
> + dev_err(dev, "invalid \"device_type\" %s\n", type);
> + return -EINVAL;
> + }
> +
> + /* Map the register space */
> + err = of_address_to_resource(node, 0, &regs);
> + if (err) {
> + dev_err(dev, "missing \"reg\" property\n");
> + return err;
> + }
> +
> + port->reg_base = devm_ioremap_resource(dev, &regs);
> + if (IS_ERR(port->reg_base))
> + return PTR_ERR(port->reg_base);
> +
> + /* Map IRQ */
> + port->irq = irq_of_parse_and_map(node, 0);
> + err = devm_request_irq(dev, port->irq, xilinx_pcie_intr_handler,
> + IRQF_SHARED, "xilinx-pcie", port);
> + if (err) {
> + dev_err(dev, "unable to request irq %d\n", port->irq);
> + return err;
> + }
> +
> + /* Get the bus range */
> + if (of_pci_parse_bus_range(node, &busn)) {
> + u32 val = pcie_read(port, XILINX_PCIE_REG_BIR);
> + u8 last;
> +
> + last = (val & XILINX_PCIE_BIR_ECAM_SZ_MASK) >>
> + XILINX_PCIE_BIR_ECAM_SZ_SHIFT;
> +
> + busn = (struct resource) {
> + .name = node->name,
> + .start = 0,
> + .end = last,
> + .flags = IORESOURCE_BUS,
> + };
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * xilinx_pcie_probe - Probe function
> + * @pdev: Platform device pointer
> + *
> + * Return: '0' on success and error value on failure
> + */
> +static int xilinx_pcie_probe(struct platform_device *pdev)
> +{
> + struct xilinx_pcie_port *port;
> + struct hw_pci hw;
> + struct device *dev = &pdev->dev;
> + int err;
> +
> + if (!dev->of_node)
> + return -ENODEV;
> +
> + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
> + if (!port)
> + return -ENOMEM;
> +
> + port->dev = dev;
> +
> + /* Parse the device tree */
> + err = xilinx_pcie_parse_dt(port);
> + if (err) {
> + dev_err(dev, "Parsing DT failed\n");
> + return err;
> + }
> +
> + /* Initialize the hardware */
> + xilinx_pcie_init_port(port);
> +
> + /* Setup IRQ Domain */
> + err = xilinx_pcie_init_irq_domain(port);
> + if (err) {
> + dev_err(dev, "Failed creating IRQ Dommain\n");
> + return err;
> + }
> +
> + /* Initialize hw_pci structure */
> + memset(&hw, 0, sizeof(hw));
> + hw = (struct hw_pci) {
> + .nr_controllers = 1,
> + .private_data = (void **)&port,
> + .setup = xilinx_pcie_setup,
> + .map_irq = of_irq_parse_and_map_pci,
> + .add_bus = xilinx_pcie_add_bus,
> + .scan = xilinx_pcie_scan_bus,
> + .ops = &xilinx_pcie_ops,
> + };
> +
> + /* Register the device */
> + pci_common_init_dev(dev, &hw);
> +
> + platform_set_drvdata(pdev, port);
> +
> + return 0;
> +}
> +
> +/**
> + * xilinx_pcie_remove - Remove function
> + * @pdev: Platform device pointer
> + *
> + * Return: '0' always
> + */
> +static int xilinx_pcie_remove(struct platform_device *pdev)
> +{
> + struct xilinx_pcie_port *port = platform_get_drvdata(pdev);
> +
> + xilinx_pcie_free_irq_domain(port);
> +
> + return 0;
> +}
> +
> +static struct of_device_id xilinx_pcie_of_match[] = {
> + { .compatible = "xlnx,axi-pcie-host-1.00.a" ,},
> + {}
> +};
> +
> +static struct platform_driver xilinx_pcie_driver = {
> + .driver = {
> + .name = "xilinx-pcie",
> + .owner = THIS_MODULE,
> + .of_match_table = xilinx_pcie_of_match,
> + .suppress_bind_attrs = true,
> + },
> + .probe = xilinx_pcie_probe,
> + .remove = xilinx_pcie_remove,
> +};
> +module_platform_driver(xilinx_pcie_driver);
> +
> +MODULE_AUTHOR("Xilinx Inc");
> +MODULE_DESCRIPTION("Xilinx AXI PCIe driver");
> +MODULE_LICENSE("GPLv2");
> --
> 1.7.9.5
>


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