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Subject[PATCH] pcie: Add Xilinx PCIe Host Bridge IP driver
Date
This is the driver for Xilinx AXI PCIe Host Bridge Soft IP

Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
---
- Rebased on v3.14.0-rc2
---
.../devicetree/bindings/pci/xilinx-pcie.txt | 43 +
drivers/pci/host/Kconfig | 7 +
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pci-xilinx.c | 985 ++++++++++++++++++++
4 files changed, 1036 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..66a2487
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/xilinx-pcie.txt
@@ -0,0 +1,43 @@
+* 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>
+- compatible: Should contain "xlnx,axi-pcie-1.00.a"
+- reg: Should contain AXI PCIe registers location and length
+- interrupts: Should contain AXI PCIe interrupt
+- ranges: ranges for the PCI memory regions
+ Please refer to the standard PCI bus binding document for a more
+ detailed explanation
+- xlnx,axibar-num: Number of memory regions configured in the hardware,
+ maximum being three which is configurable in the hardware.
+- xlnx,include-rc: Root Port (=1) or End Point (=0)
+- xlnx,pciebar2axibar-0: Translation address from PCIe to AXI
+ Only one PCIe BAR is applicable in Root port mode, it can be
+ either 32/64-bit. If it is 64-bit BAR, lower 32 bits are present
+ in 'xlnx,pciebar2axibar-0' and Upper 32 bits in 'xlnx,pciebar2
+ axibar-1'. And if it is 32-bit BAR, only 'xlnx,pciebar2axibar-0'
+ is valid
+
+Optional properties
+- xlnx,pciebar-as: PCIe BAR aperture size is 32 (=0) or 64-bit (=1).
+- xlnx,pciebar2axibar-1: Translation address from PCIe to AXI, contains
+ upper 32 bits if PCIe BAR size is 64-bit. When xlnx,pciebar-as
+ is set, this is a required property and should contain a valid
+ value (other than FF's)
+
+Example:
+++++++++
+
+ pci_express: axi-pcie@50000000 {
+ #address-cells = <3>;
+ #size-cells = <2>;
+ compatible = "xlnx,axi-pcie-1.00.a";
+ reg = < 0x50000000 0x10000000 >;
+ interrupts = < 0 52 4 >;
+ ranges = < 0x02000000 0 0x60000000 0x60000000 0 0x10000000 >;
+ xlnx,axibar-num = <0x1>;
+ xlnx,include-rc;
+ xlnx,pciebar2axibar-0 = <0x0>;
+ xlnx,pciebar2axibar-1 = <0xffffffff>;
+ };
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 47d46c6..8771824 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..3ba5f45
--- /dev/null
+++ b/drivers/pci/host/pci-xilinx.c
@@ -0,0 +1,985 @@
+/*
+ * 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
+ *
+ * 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_MSI_ADR_MASK GENMASK(26, 16)
+#define XILINX_PCIE_RPIFR1_ALL_MASK 0xFFFFFFFF
+#define XILINX_PCIE_RPIFR1_MSI_ADR_SHIFT 16
+
+/* Bridge Info Register definitions */
+#define XILINX_PCIE_BIR_ECAM_SZ_MASK BIT(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
+ * @phys_reg_base: Physical Register Base
+ * @reg_size: Register space
+ * @irq: Interrupt number
+ * @transn_addr_0: Translation address 0
+ * @transn_addr_1: Translation address 1
+ * @msg_addr: MSI message address
+ * @root_busno: Root Bus number
+ * @mem_resno: Number of memory resources
+ * @link_up: Link status flag
+ * @aperture_width: Aperture width
+ * @node: Device tree node
+ * @dev: Device pointer
+ * @irq_domain: IRQ domain pointer
+ * @mem: Memory Resources
+ */
+struct xilinx_pcie_port {
+ void __iomem *reg_base;
+ u32 phys_reg_base;
+ u32 reg_size;
+ u32 irq;
+ u32 transn_addr_0;
+ u32 transn_addr_1;
+ unsigned long msg_addr;
+ u8 root_busno;
+ u8 mem_resno;
+ bool link_up;
+ bool aperture_width;
+ struct device_node *node;
+ struct device *dev;
+ struct irq_domain *irq_domain;
+ struct resource mem[XILINX_MAX_NUM_RESOURCES];
+};
+
+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
+ * @port: PCIe port information
+ * @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 xilinx_pcie_port *port,
+ struct pci_bus *bus,
+ unsigned int devfn)
+{
+ /* 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
+ * @port: PCIe port information
+ * @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 xilinx_pcie_port *port,
+ struct pci_bus *bus,
+ unsigned int devfn,
+ int where)
+{
+ 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(port, bus, devfn)) {
+ *val = 0xFFFFFFFF;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ addr = xilinx_pcie_get_config_base(port, bus, devfn, where);
+ if (!addr)
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+
+ 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(port, bus, devfn))
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ addr = xilinx_pcie_get_config_base(port, bus, devfn, where);
+ if (!addr)
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+
+ 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);
+}
+
+/* PCIe HW Functions */
+
+/**
+ * xilinx_pcie_setup - Setup memory resources
+ * @nr: Bus number
+ * @sys: Per controller structure
+ *
+ * Return: '1' on success and '0' on failure
+ */
+static int xilinx_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+ struct xilinx_pcie_port *port = sys_to_pcie(sys);
+ int i;
+
+ if (!port)
+ return 0;
+
+ for (i = 0; i < port->mem_resno; i++)
+ pci_add_resource_offset(&sys->resources, &port->mem[i],
+ sys->mem_offset);
+
+ return 1;
+}
+
+/**
+ * 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;
+ }
+}
+
+/**
+ * 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(NULL, sys->busnr, &xilinx_pcie_ops,
+ sys, &sys->resources);
+ } else {
+ bus = NULL;
+ BUG();
+ }
+
+ return bus;
+}
+
+/**
+ * xilinx_pcie_map_irq - Get the interrupt of this port
+ * @dev: PCIe device
+ * @slot: Bridge slot
+ * @pin: Interrupt pin
+ *
+ * Return: Interrupt number on success and error value on failure
+ */
+static int xilinx_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ struct xilinx_pcie_port *port = sys_to_pcie(dev->bus->sysdata);
+
+ if (!port)
+ return -EINVAL;
+
+ return port->irq;
+}
+
+/**
+ * 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;
+ }
+
+ /* Check MSI or INTX */
+ if (!(val & XILINX_PCIE_RPIFR1_MSI_INTR)) {
+ if (val & XILINX_PCIE_RPIFR1_INTR_ASSRT)
+ dev_dbg(port->dev, "INTx assert\n");
+ else
+ dev_dbg(port->dev, "INTx deassert\n");
+ }
+
+ /* Clear interrupt FIFO register 1 */
+ pcie_write(port, XILINX_PCIE_RPIFR1_ALL_MASK,
+ XILINX_PCIE_REG_RPIFR1);
+ }
+
+ 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_init_port - Initialize hardware
+ * @port: PCIe port information
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int xilinx_pcie_init_port(struct xilinx_pcie_port *port)
+{
+ int err;
+ u32 val, last, first = 0;
+
+ port->reg_base = devm_ioremap(port->dev, port->phys_reg_base,
+ port->reg_size);
+ if (!port->reg_base)
+ return -ENOMEM;
+
+ /* make sure it is root port before touching header */
+ pcie_write(port, PCI_COMMAND_MASTER, PCI_COMMAND);
+
+ /* 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);
+
+ /* Register Interrupt Handler */
+ err = request_irq(port->irq, xilinx_pcie_intr_handler,
+ IRQF_SHARED, "xilinx-pcie", port);
+ if (err) {
+ dev_err(port->dev,
+ "Could not allocate interrupt %d\n", port->irq);
+ return err;
+ }
+
+ /* Get last bus number */
+ val = pcie_read(port, XILINX_PCIE_REG_BIR);
+ last = (val & XILINX_PCIE_BIR_ECAM_SZ_MASK) >>
+ XILINX_PCIE_BIR_ECAM_SZ_SHIFT;
+
+ /* Write primary, secondary and subordinate bus numbers */
+ val = pcie_read(port, PCI_PRIMARY_BUS) & PCI_LATENCY_TIMER_MASK;
+ val |= first;
+ val |= (first + 1) << PCI_SECONDARY_BUS_NUM_SHIFT;
+ val |= last << PCI_SUBORDINATE_BUS_NUM_SHIFT;
+ pcie_write(port, val, PCI_PRIMARY_BUS);
+
+ /* Setup RC BARs */
+ pcie_write(port, port->transn_addr_0, PCI_BASE_ADDRESS_0);
+ if (port->aperture_width)
+ pcie_write(port, port->transn_addr_1, PCI_BASE_ADDRESS_1);
+
+ return 0;
+}
+
+/**
+ * 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 platform_device *pdev = to_platform_device(port->dev);
+ struct device_node *node = port->dev->of_node;
+ struct resource *io, res;
+ struct of_pci_range_parser parser;
+ struct of_pci_range range;
+ int err, i = 0;
+
+ /* Check if it is configured for Root Port */
+ if (!of_property_read_bool(node, "xlnx,include-rc")) {
+ dev_err(port->dev, "Not configured for Root Port\n");
+ return -EINVAL;
+ }
+
+ /* Request and map I/O memory */
+ io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ port->phys_reg_base = io->start;
+ port->reg_size = resource_size(io);
+
+ /* Map the IRQ */
+ port->irq = irq_of_parse_and_map(node, 0);
+ if (!port->irq) {
+ dev_err(port->dev, "Unable to get IRQ\n");
+ return -EINVAL;
+ }
+
+ /* Is the aperture width 32/64? */
+ port->aperture_width = of_property_read_bool(node, "xlnx,pciebar-as");
+
+ /* Get address translation parameters */
+ err = of_property_read_u32(node, "xlnx,pciebar2axibar-0",
+ &port->transn_addr_0);
+ if (err) {
+ dev_err(port->dev, "No translation address 0 found\n");
+ return err;
+ }
+
+ if (port->aperture_width) {
+ err = of_property_read_u32(node, "xlnx,pciebar2axibar-1",
+ &port->transn_addr_1);
+ if (err) {
+ dev_err(port->dev, "No translation address 1 found\n");
+ return err;
+ }
+ }
+
+ /* Get memory resources */
+ err = of_property_read_u8(node, "xlnx,axibar-num", &port->mem_resno);
+ if (err) {
+ dev_err(port->dev, "No Memory resources found\n");
+ return err;
+ }
+
+ if (of_pci_range_parser_init(&parser, node)) {
+ dev_err(port->dev, "missing \"ranges\" property\n");
+ return -EINVAL;
+ }
+
+ for_each_of_pci_range(&parser, &range) {
+ if (i >= port->mem_resno) {
+ dev_err(port->dev, "Maximum memory resources exceeded\n");
+ return -EINVAL;
+ }
+
+ of_pci_range_to_resource(&range, node, &res);
+
+ switch (res.flags & IORESOURCE_TYPE_BITS) {
+ case IORESOURCE_MEM:
+ if (res.flags & IORESOURCE_PREFETCH)
+ port->mem[i].name = "PREFETCH";
+ else
+ port->mem[i].name = "MEM";
+
+ memcpy(&port->mem[i], &res, sizeof(res));
+ i++;
+ /* Fallthrough */
+ default:
+ break;
+ }
+ }
+
+ 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;
+ int err;
+
+ port = devm_kzalloc(&pdev->dev, sizeof(struct xilinx_pcie_port *),
+ GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+
+ port->dev = &pdev->dev;
+
+ /* Parse the device tree */
+ err = xilinx_pcie_parse_dt(port);
+ if (err) {
+ dev_err(port->dev, "Parsing DT failed\n");
+ return err;
+ }
+
+ /* Initialize the hardware */
+ err = xilinx_pcie_init_port(port);
+ if (err) {
+ dev_err(port->dev, "HW Initalization failed\n");
+ return err;
+ }
+
+ /* Setup MSI */
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ int i;
+
+ port->irq_domain = irq_domain_add_linear(port->dev->of_node,
+ XILINX_NUM_MSI_IRQS, &msi_domain_ops,
+ &xilinx_pcie_msi_chip);
+ if (!port->irq_domain) {
+ dev_err(port->dev, "Failed to get an IRQ domain\n");
+ return -ENXIO;
+ }
+
+ for (i = 0; i < XILINX_NUM_MSI_IRQS; i++)
+ irq_create_mapping(port->irq_domain, i);
+
+ xilinx_pcie_enable_msi(port);
+ }
+
+ memset(&hw, 0, sizeof(hw));
+
+ hw.nr_controllers = 1;
+ hw.private_data = (void **)&port;
+ hw.setup = xilinx_pcie_setup;
+ hw.map_irq = xilinx_pcie_map_irq;
+ hw.add_bus = xilinx_pcie_add_bus;
+ hw.scan = xilinx_pcie_scan_bus;
+ hw.ops = &xilinx_pcie_ops;
+
+ /* Register the device */
+ pci_common_init_dev(port->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);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ int i;
+ u32 irq;
+
+ free_pages(port->msg_addr, 0);
+
+ for (i = 0; i < XILINX_NUM_MSI_IRQS; i++) {
+ irq = irq_find_mapping(port->irq_domain, i);
+ if (irq > 0)
+ irq_dispose_mapping(irq);
+ }
+
+ irq_domain_remove(port->irq_domain);
+ }
+
+ if (port->irq > 0)
+ free_irq(port->irq, port);
+
+ return 0;
+}
+
+static struct of_device_id xilinx_pcie_of_match[] = {
+ { .compatible = "xlnx,axi-pcie-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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