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621 lines
16 KiB
621 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* PCIe host controller driver for Xilinx AXI PCIe Bridge |
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* |
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* Copyright (c) 2012 - 2014 Xilinx, Inc. |
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* |
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* Based on the Tegra PCIe driver |
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* |
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* Bits taken from Synopsys DesignWare Host controller driver and |
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* ARM PCI Host generic driver. |
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*/ |
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|
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/irqdomain.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/msi.h> |
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#include <linux/of_address.h> |
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#include <linux/of_pci.h> |
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#include <linux/of_platform.h> |
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#include <linux/of_irq.h> |
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#include <linux/pci.h> |
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#include <linux/pci-ecam.h> |
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#include <linux/platform_device.h> |
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|
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#include "../pci.h" |
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|
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/* Register definitions */ |
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#define XILINX_PCIE_REG_BIR 0x00000130 |
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#define XILINX_PCIE_REG_IDR 0x00000138 |
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#define XILINX_PCIE_REG_IMR 0x0000013c |
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#define XILINX_PCIE_REG_PSCR 0x00000144 |
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#define XILINX_PCIE_REG_RPSC 0x00000148 |
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#define XILINX_PCIE_REG_MSIBASE1 0x0000014c |
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#define XILINX_PCIE_REG_MSIBASE2 0x00000150 |
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#define XILINX_PCIE_REG_RPEFR 0x00000154 |
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#define XILINX_PCIE_REG_RPIFR1 0x00000158 |
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#define XILINX_PCIE_REG_RPIFR2 0x0000015c |
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|
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/* Interrupt registers definitions */ |
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#define XILINX_PCIE_INTR_LINK_DOWN BIT(0) |
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#define XILINX_PCIE_INTR_ECRC_ERR BIT(1) |
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#define XILINX_PCIE_INTR_STR_ERR BIT(2) |
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#define XILINX_PCIE_INTR_HOT_RESET BIT(3) |
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#define XILINX_PCIE_INTR_CFG_TIMEOUT BIT(8) |
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#define XILINX_PCIE_INTR_CORRECTABLE BIT(9) |
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#define XILINX_PCIE_INTR_NONFATAL BIT(10) |
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#define XILINX_PCIE_INTR_FATAL BIT(11) |
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#define XILINX_PCIE_INTR_INTX BIT(16) |
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#define XILINX_PCIE_INTR_MSI BIT(17) |
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#define XILINX_PCIE_INTR_SLV_UNSUPP BIT(20) |
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#define XILINX_PCIE_INTR_SLV_UNEXP BIT(21) |
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#define XILINX_PCIE_INTR_SLV_COMPL BIT(22) |
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#define XILINX_PCIE_INTR_SLV_ERRP BIT(23) |
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#define XILINX_PCIE_INTR_SLV_CMPABT BIT(24) |
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#define XILINX_PCIE_INTR_SLV_ILLBUR BIT(25) |
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#define XILINX_PCIE_INTR_MST_DECERR BIT(26) |
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#define XILINX_PCIE_INTR_MST_SLVERR BIT(27) |
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#define XILINX_PCIE_INTR_MST_ERRP BIT(28) |
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#define XILINX_PCIE_IMR_ALL_MASK 0x1FF30FED |
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#define XILINX_PCIE_IMR_ENABLE_MASK 0x1FF30F0D |
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#define XILINX_PCIE_IDR_ALL_MASK 0xFFFFFFFF |
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|
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/* Root Port Error FIFO Read Register definitions */ |
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#define XILINX_PCIE_RPEFR_ERR_VALID BIT(18) |
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#define XILINX_PCIE_RPEFR_REQ_ID GENMASK(15, 0) |
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#define XILINX_PCIE_RPEFR_ALL_MASK 0xFFFFFFFF |
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|
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/* Root Port Interrupt FIFO Read Register 1 definitions */ |
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#define XILINX_PCIE_RPIFR1_INTR_VALID BIT(31) |
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#define XILINX_PCIE_RPIFR1_MSI_INTR BIT(30) |
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#define XILINX_PCIE_RPIFR1_INTR_MASK GENMASK(28, 27) |
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#define XILINX_PCIE_RPIFR1_ALL_MASK 0xFFFFFFFF |
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#define XILINX_PCIE_RPIFR1_INTR_SHIFT 27 |
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|
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/* Bridge Info Register definitions */ |
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#define XILINX_PCIE_BIR_ECAM_SZ_MASK GENMASK(18, 16) |
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#define XILINX_PCIE_BIR_ECAM_SZ_SHIFT 16 |
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|
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/* Root Port Interrupt FIFO Read Register 2 definitions */ |
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#define XILINX_PCIE_RPIFR2_MSG_DATA GENMASK(15, 0) |
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|
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/* Root Port Status/control Register definitions */ |
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#define XILINX_PCIE_REG_RPSC_BEN BIT(0) |
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|
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/* Phy Status/Control Register definitions */ |
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#define XILINX_PCIE_REG_PSCR_LNKUP BIT(11) |
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|
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/* Number of MSI IRQs */ |
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#define XILINX_NUM_MSI_IRQS 128 |
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|
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/** |
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* struct xilinx_pcie_port - PCIe port information |
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* @reg_base: IO Mapped Register Base |
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* @dev: Device pointer |
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* @msi_map: Bitmap of allocated MSIs |
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* @map_lock: Mutex protecting the MSI allocation |
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* @msi_domain: MSI IRQ domain pointer |
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* @leg_domain: Legacy IRQ domain pointer |
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* @resources: Bus Resources |
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*/ |
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struct xilinx_pcie_port { |
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void __iomem *reg_base; |
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struct device *dev; |
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unsigned long msi_map[BITS_TO_LONGS(XILINX_NUM_MSI_IRQS)]; |
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struct mutex map_lock; |
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struct irq_domain *msi_domain; |
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struct irq_domain *leg_domain; |
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struct list_head resources; |
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}; |
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static inline u32 pcie_read(struct xilinx_pcie_port *port, u32 reg) |
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{ |
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return readl(port->reg_base + reg); |
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} |
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static inline void pcie_write(struct xilinx_pcie_port *port, u32 val, u32 reg) |
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{ |
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writel(val, port->reg_base + reg); |
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} |
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static inline bool xilinx_pcie_link_up(struct xilinx_pcie_port *port) |
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{ |
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return (pcie_read(port, XILINX_PCIE_REG_PSCR) & |
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XILINX_PCIE_REG_PSCR_LNKUP) ? 1 : 0; |
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} |
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|
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/** |
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* xilinx_pcie_clear_err_interrupts - Clear Error Interrupts |
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* @port: PCIe port information |
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*/ |
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static void xilinx_pcie_clear_err_interrupts(struct xilinx_pcie_port *port) |
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{ |
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struct device *dev = port->dev; |
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unsigned long val = pcie_read(port, XILINX_PCIE_REG_RPEFR); |
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if (val & XILINX_PCIE_RPEFR_ERR_VALID) { |
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dev_dbg(dev, "Requester ID %lu\n", |
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val & XILINX_PCIE_RPEFR_REQ_ID); |
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pcie_write(port, XILINX_PCIE_RPEFR_ALL_MASK, |
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XILINX_PCIE_REG_RPEFR); |
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} |
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} |
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|
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/** |
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* xilinx_pcie_valid_device - Check if a valid device is present on bus |
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* @bus: PCI Bus structure |
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* @devfn: device/function |
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* |
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* Return: 'true' on success and 'false' if invalid device is found |
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*/ |
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static bool xilinx_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) |
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{ |
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struct xilinx_pcie_port *port = bus->sysdata; |
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|
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/* Check if link is up when trying to access downstream ports */ |
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if (!pci_is_root_bus(bus)) { |
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if (!xilinx_pcie_link_up(port)) |
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return false; |
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} else if (devfn > 0) { |
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/* Only one device down on each root port */ |
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return false; |
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} |
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return true; |
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} |
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|
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/** |
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* xilinx_pcie_map_bus - Get configuration base |
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* @bus: PCI Bus structure |
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* @devfn: Device/function |
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* @where: Offset from base |
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* |
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* Return: Base address of the configuration space needed to be |
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* accessed. |
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*/ |
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static void __iomem *xilinx_pcie_map_bus(struct pci_bus *bus, |
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unsigned int devfn, int where) |
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{ |
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struct xilinx_pcie_port *port = bus->sysdata; |
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|
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if (!xilinx_pcie_valid_device(bus, devfn)) |
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return NULL; |
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return port->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where); |
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} |
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/* PCIe operations */ |
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static struct pci_ops xilinx_pcie_ops = { |
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.map_bus = xilinx_pcie_map_bus, |
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.read = pci_generic_config_read, |
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.write = pci_generic_config_write, |
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}; |
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|
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/* MSI functions */ |
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static void xilinx_msi_top_irq_ack(struct irq_data *d) |
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{ |
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/* |
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* xilinx_pcie_intr_handler() will have performed the Ack. |
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* Eventually, this should be fixed and the Ack be moved in |
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* the respective callbacks for INTx and MSI. |
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*/ |
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} |
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static struct irq_chip xilinx_msi_top_chip = { |
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.name = "PCIe MSI", |
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.irq_ack = xilinx_msi_top_irq_ack, |
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}; |
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static int xilinx_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force) |
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{ |
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return -EINVAL; |
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} |
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static void xilinx_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) |
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{ |
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struct xilinx_pcie_port *pcie = irq_data_get_irq_chip_data(data); |
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phys_addr_t pa = ALIGN_DOWN(virt_to_phys(pcie), SZ_4K); |
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msg->address_lo = lower_32_bits(pa); |
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msg->address_hi = upper_32_bits(pa); |
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msg->data = data->hwirq; |
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} |
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static struct irq_chip xilinx_msi_bottom_chip = { |
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.name = "Xilinx MSI", |
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.irq_set_affinity = xilinx_msi_set_affinity, |
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.irq_compose_msi_msg = xilinx_compose_msi_msg, |
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}; |
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static int xilinx_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, |
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unsigned int nr_irqs, void *args) |
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{ |
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struct xilinx_pcie_port *port = domain->host_data; |
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int hwirq, i; |
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mutex_lock(&port->map_lock); |
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hwirq = bitmap_find_free_region(port->msi_map, XILINX_NUM_MSI_IRQS, order_base_2(nr_irqs)); |
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mutex_unlock(&port->map_lock); |
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if (hwirq < 0) |
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return -ENOSPC; |
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for (i = 0; i < nr_irqs; i++) |
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irq_domain_set_info(domain, virq + i, hwirq + i, |
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&xilinx_msi_bottom_chip, domain->host_data, |
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handle_edge_irq, NULL, NULL); |
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return 0; |
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} |
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static void xilinx_msi_domain_free(struct irq_domain *domain, unsigned int virq, |
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unsigned int nr_irqs) |
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{ |
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struct irq_data *d = irq_domain_get_irq_data(domain, virq); |
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struct xilinx_pcie_port *port = domain->host_data; |
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mutex_lock(&port->map_lock); |
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bitmap_release_region(port->msi_map, d->hwirq, order_base_2(nr_irqs)); |
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mutex_unlock(&port->map_lock); |
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} |
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static const struct irq_domain_ops xilinx_msi_domain_ops = { |
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.alloc = xilinx_msi_domain_alloc, |
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.free = xilinx_msi_domain_free, |
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}; |
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static struct msi_domain_info xilinx_msi_info = { |
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.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), |
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.chip = &xilinx_msi_top_chip, |
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}; |
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static int xilinx_allocate_msi_domains(struct xilinx_pcie_port *pcie) |
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{ |
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struct fwnode_handle *fwnode = dev_fwnode(pcie->dev); |
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struct irq_domain *parent; |
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parent = irq_domain_create_linear(fwnode, XILINX_NUM_MSI_IRQS, |
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&xilinx_msi_domain_ops, pcie); |
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if (!parent) { |
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dev_err(pcie->dev, "failed to create IRQ domain\n"); |
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return -ENOMEM; |
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} |
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irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS); |
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pcie->msi_domain = pci_msi_create_irq_domain(fwnode, &xilinx_msi_info, parent); |
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if (!pcie->msi_domain) { |
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dev_err(pcie->dev, "failed to create MSI domain\n"); |
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irq_domain_remove(parent); |
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return -ENOMEM; |
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} |
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return 0; |
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} |
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static void xilinx_free_msi_domains(struct xilinx_pcie_port *pcie) |
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{ |
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struct irq_domain *parent = pcie->msi_domain->parent; |
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|
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irq_domain_remove(pcie->msi_domain); |
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irq_domain_remove(parent); |
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} |
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/* INTx Functions */ |
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|
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/** |
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* xilinx_pcie_intx_map - Set the handler for the INTx and mark IRQ as valid |
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* @domain: IRQ domain |
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* @irq: Virtual IRQ number |
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* @hwirq: HW interrupt number |
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* |
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* Return: Always returns 0. |
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*/ |
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static int xilinx_pcie_intx_map(struct irq_domain *domain, unsigned int irq, |
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irq_hw_number_t hwirq) |
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{ |
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irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq); |
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irq_set_chip_data(irq, domain->host_data); |
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return 0; |
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} |
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/* INTx IRQ Domain operations */ |
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static const struct irq_domain_ops intx_domain_ops = { |
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.map = xilinx_pcie_intx_map, |
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.xlate = pci_irqd_intx_xlate, |
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}; |
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|
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/* PCIe HW Functions */ |
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|
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/** |
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* xilinx_pcie_intr_handler - Interrupt Service Handler |
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* @irq: IRQ number |
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* @data: PCIe port information |
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* |
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* Return: IRQ_HANDLED on success and IRQ_NONE on failure |
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*/ |
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static irqreturn_t xilinx_pcie_intr_handler(int irq, void *data) |
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{ |
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struct xilinx_pcie_port *port = (struct xilinx_pcie_port *)data; |
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struct device *dev = port->dev; |
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u32 val, mask, status; |
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|
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/* Read interrupt decode and mask registers */ |
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val = pcie_read(port, XILINX_PCIE_REG_IDR); |
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mask = pcie_read(port, XILINX_PCIE_REG_IMR); |
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status = val & mask; |
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if (!status) |
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return IRQ_NONE; |
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if (status & XILINX_PCIE_INTR_LINK_DOWN) |
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dev_warn(dev, "Link Down\n"); |
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if (status & XILINX_PCIE_INTR_ECRC_ERR) |
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dev_warn(dev, "ECRC failed\n"); |
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if (status & XILINX_PCIE_INTR_STR_ERR) |
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dev_warn(dev, "Streaming error\n"); |
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if (status & XILINX_PCIE_INTR_HOT_RESET) |
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dev_info(dev, "Hot reset\n"); |
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if (status & XILINX_PCIE_INTR_CFG_TIMEOUT) |
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dev_warn(dev, "ECAM access timeout\n"); |
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if (status & XILINX_PCIE_INTR_CORRECTABLE) { |
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dev_warn(dev, "Correctable error message\n"); |
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xilinx_pcie_clear_err_interrupts(port); |
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} |
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if (status & XILINX_PCIE_INTR_NONFATAL) { |
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dev_warn(dev, "Non fatal error message\n"); |
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xilinx_pcie_clear_err_interrupts(port); |
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} |
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if (status & XILINX_PCIE_INTR_FATAL) { |
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dev_warn(dev, "Fatal error message\n"); |
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xilinx_pcie_clear_err_interrupts(port); |
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} |
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if (status & (XILINX_PCIE_INTR_INTX | XILINX_PCIE_INTR_MSI)) { |
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struct irq_domain *domain; |
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val = pcie_read(port, XILINX_PCIE_REG_RPIFR1); |
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|
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/* Check whether interrupt valid */ |
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if (!(val & XILINX_PCIE_RPIFR1_INTR_VALID)) { |
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dev_warn(dev, "RP Intr FIFO1 read error\n"); |
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goto error; |
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} |
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/* Decode the IRQ number */ |
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if (val & XILINX_PCIE_RPIFR1_MSI_INTR) { |
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val = pcie_read(port, XILINX_PCIE_REG_RPIFR2) & |
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XILINX_PCIE_RPIFR2_MSG_DATA; |
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domain = port->msi_domain->parent; |
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} else { |
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val = (val & XILINX_PCIE_RPIFR1_INTR_MASK) >> |
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XILINX_PCIE_RPIFR1_INTR_SHIFT; |
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domain = port->leg_domain; |
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} |
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|
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/* Clear interrupt FIFO register 1 */ |
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pcie_write(port, XILINX_PCIE_RPIFR1_ALL_MASK, |
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XILINX_PCIE_REG_RPIFR1); |
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|
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generic_handle_domain_irq(domain, val); |
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} |
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|
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if (status & XILINX_PCIE_INTR_SLV_UNSUPP) |
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dev_warn(dev, "Slave unsupported request\n"); |
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|
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if (status & XILINX_PCIE_INTR_SLV_UNEXP) |
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dev_warn(dev, "Slave unexpected completion\n"); |
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|
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if (status & XILINX_PCIE_INTR_SLV_COMPL) |
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dev_warn(dev, "Slave completion timeout\n"); |
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|
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if (status & XILINX_PCIE_INTR_SLV_ERRP) |
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dev_warn(dev, "Slave Error Poison\n"); |
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|
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if (status & XILINX_PCIE_INTR_SLV_CMPABT) |
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dev_warn(dev, "Slave Completer Abort\n"); |
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|
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if (status & XILINX_PCIE_INTR_SLV_ILLBUR) |
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dev_warn(dev, "Slave Illegal Burst\n"); |
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|
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if (status & XILINX_PCIE_INTR_MST_DECERR) |
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dev_warn(dev, "Master decode error\n"); |
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|
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if (status & XILINX_PCIE_INTR_MST_SLVERR) |
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dev_warn(dev, "Master slave error\n"); |
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|
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if (status & XILINX_PCIE_INTR_MST_ERRP) |
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dev_warn(dev, "Master error poison\n"); |
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|
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error: |
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/* Clear the Interrupt Decode register */ |
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pcie_write(port, status, XILINX_PCIE_REG_IDR); |
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|
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return IRQ_HANDLED; |
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} |
|
|
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/** |
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* xilinx_pcie_init_irq_domain - Initialize IRQ domain |
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* @port: PCIe port information |
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* |
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* Return: '0' on success and error value on failure |
|
*/ |
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static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port) |
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{ |
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struct device *dev = port->dev; |
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struct device_node *pcie_intc_node; |
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int ret; |
|
|
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/* Setup INTx */ |
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pcie_intc_node = of_get_next_child(dev->of_node, NULL); |
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if (!pcie_intc_node) { |
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dev_err(dev, "No PCIe Intc node found\n"); |
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return -ENODEV; |
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} |
|
|
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port->leg_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX, |
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&intx_domain_ops, |
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port); |
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of_node_put(pcie_intc_node); |
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if (!port->leg_domain) { |
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dev_err(dev, "Failed to get a INTx IRQ domain\n"); |
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return -ENODEV; |
|
} |
|
|
|
/* Setup MSI */ |
|
if (IS_ENABLED(CONFIG_PCI_MSI)) { |
|
phys_addr_t pa = ALIGN_DOWN(virt_to_phys(port), SZ_4K); |
|
|
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ret = xilinx_allocate_msi_domains(port); |
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if (ret) |
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return ret; |
|
|
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pcie_write(port, upper_32_bits(pa), XILINX_PCIE_REG_MSIBASE1); |
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pcie_write(port, lower_32_bits(pa), XILINX_PCIE_REG_MSIBASE2); |
|
} |
|
|
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return 0; |
|
} |
|
|
|
/** |
|
* xilinx_pcie_init_port - Initialize hardware |
|
* @port: PCIe port information |
|
*/ |
|
static void xilinx_pcie_init_port(struct xilinx_pcie_port *port) |
|
{ |
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struct device *dev = port->dev; |
|
|
|
if (xilinx_pcie_link_up(port)) |
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dev_info(dev, "PCIe Link is UP\n"); |
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else |
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dev_info(dev, "PCIe Link is DOWN\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 we handle */ |
|
pcie_write(port, XILINX_PCIE_IMR_ENABLE_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_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; |
|
unsigned int irq; |
|
int err; |
|
|
|
err = of_address_to_resource(node, 0, ®s); |
|
if (err) { |
|
dev_err(dev, "missing \"reg\" property\n"); |
|
return err; |
|
} |
|
|
|
port->reg_base = devm_pci_remap_cfg_resource(dev, ®s); |
|
if (IS_ERR(port->reg_base)) |
|
return PTR_ERR(port->reg_base); |
|
|
|
irq = irq_of_parse_and_map(node, 0); |
|
err = devm_request_irq(dev, irq, xilinx_pcie_intr_handler, |
|
IRQF_SHARED | IRQF_NO_THREAD, |
|
"xilinx-pcie", port); |
|
if (err) { |
|
dev_err(dev, "unable to request irq %d\n", irq); |
|
return err; |
|
} |
|
|
|
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 device *dev = &pdev->dev; |
|
struct xilinx_pcie_port *port; |
|
struct pci_host_bridge *bridge; |
|
int err; |
|
|
|
if (!dev->of_node) |
|
return -ENODEV; |
|
|
|
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port)); |
|
if (!bridge) |
|
return -ENODEV; |
|
|
|
port = pci_host_bridge_priv(bridge); |
|
mutex_init(&port->map_lock); |
|
port->dev = dev; |
|
|
|
err = xilinx_pcie_parse_dt(port); |
|
if (err) { |
|
dev_err(dev, "Parsing DT failed\n"); |
|
return err; |
|
} |
|
|
|
xilinx_pcie_init_port(port); |
|
|
|
err = xilinx_pcie_init_irq_domain(port); |
|
if (err) { |
|
dev_err(dev, "Failed creating IRQ Domain\n"); |
|
return err; |
|
} |
|
|
|
bridge->sysdata = port; |
|
bridge->ops = &xilinx_pcie_ops; |
|
|
|
err = pci_host_probe(bridge); |
|
if (err) |
|
xilinx_free_msi_domains(port); |
|
|
|
return err; |
|
} |
|
|
|
static const 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", |
|
.of_match_table = xilinx_pcie_of_match, |
|
.suppress_bind_attrs = true, |
|
}, |
|
.probe = xilinx_pcie_probe, |
|
}; |
|
builtin_platform_driver(xilinx_pcie_driver);
|
|
|