/* * 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 #include #include #include #include #include #include #include #include #include #include #include /* Register definitions */ #define XILINX_PCIE_REG_BIR 0x00000130 #define XILINX_PCIE_REG_IDR 0x00000138 #define XILINX_PCIE_REG_IMR 0x0000013c #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 /* 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_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_MASK GENMASK(28, 27) #define XILINX_PCIE_RPIFR1_ALL_MASK 0xFFFFFFFF #define XILINX_PCIE_RPIFR1_INTR_SHIFT 27 /* 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 /* 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 * @msi_pages: MSI pages * @root_busno: Root Bus number * @dev: Device pointer * @irq_domain: IRQ domain pointer * @bus_range: Bus range * @resources: Bus Resources */ struct xilinx_pcie_port { void __iomem *reg_base; u32 irq; unsigned long msi_pages; u8 root_busno; struct device *dev; struct irq_domain *irq_domain; struct resource bus_range; struct list_head 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_link_is_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 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_valid_device - Check if a valid device is present on bus * @bus: PCI Bus structure * @devfn: device/function * * Return: 'true' on success and 'false' if invalid device is found */ static bool xilinx_pcie_valid_device(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_link_is_up(port)) return false; /* Only one device down on each root port */ if (bus->number == port->root_busno && devfn > 0) return false; /* * Do not read more than one device on the bus directly attached * to RC. */ if (bus->primary == port->root_busno && devfn > 0) return false; return true; } /** * xilinx_pcie_config_base - Get configuration base * @bus: PCI Bus structure * @devfn: Device/function * @where: Offset from base * * Return: Base address of the configuration space needed to be * accessed. */ static void __iomem *xilinx_pcie_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: PCI Bus structure * @devfn: Device/function * @where: Offset from base * @size: Byte/word/dword * @val: Value to be read * * Return: PCIBIOS_SUCCESSFUL on success * PCIBIOS_DEVICE_NOT_FOUND on failure */ static int xilinx_pcie_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { void __iomem *addr; if (!xilinx_pcie_valid_device(bus, devfn)) { *val = 0xFFFFFFFF; return PCIBIOS_DEVICE_NOT_FOUND; } addr = xilinx_pcie_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: PCI Bus structure * @devfn: Device/function * @where: Offset from base * @size: Byte/word/dword * @val: Value to be written to device * * Return: PCIBIOS_SUCCESSFUL on success * PCIBIOS_DEVICE_NOT_FOUND on failure */ static int xilinx_pcie_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { void __iomem *addr; if (!xilinx_pcie_valid_device(bus, devfn)) return PCIBIOS_DEVICE_NOT_FOUND; addr = xilinx_pcie_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 (!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 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_controller *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_controller *chip, struct pci_dev *pdev, struct msi_desc *desc) { struct xilinx_pcie_port *port = sys_to_pcie(pdev->bus->sysdata); unsigned int irq; int hwirq; struct msi_msg msg; phys_addr_t msg_addr; hwirq = xilinx_pcie_assign_msi(port); if (hwirq < 0) return hwirq; irq = irq_create_mapping(port->irq_domain, hwirq); if (!irq) return -EINVAL; irq_set_msi_desc(irq, desc); msg_addr = virt_to_phys((void *)port->msi_pages); msg.address_hi = 0; msg.address_lo = msg_addr; msg.data = irq; pci_write_msi_msg(irq, &msg); return 0; } /* MSI Chip Descriptor */ static struct msi_controller 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) { phys_addr_t msg_addr; port->msi_pages = __get_free_pages(GFP_KERNEL, 0); msg_addr = virt_to_phys((void *)port->msi_pages); pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1); pcie_write(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); 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->msi_pages, 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; struct device_node *pcie_intc_node; /* Setup INTx */ pcie_intc_node = of_get_next_child(node, NULL); if (!pcie_intc_node) { dev_err(dev, "No PCIe Intc node found\n"); return 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); } /* Setup MSI */ if (IS_ENABLED(CONFIG_PCI_MSI)) { 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); } xilinx_pcie_enable_msi(port); } return 0; } /** * xilinx_pcie_init_port - Initialize hardware * @port: PCIe port information */ static void xilinx_pcie_init_port(struct xilinx_pcie_port *port) { if (xilinx_pcie_link_is_up(port)) dev_info(port->dev, "PCIe Link is UP\n"); else dev_info(port->dev, "PCIe Link is DOWN\n"); /* Disable all interrupts */ pcie_write(port, ~XILINX_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); list_splice_init(&port->resources, &sys->resources); return 1; } /** * 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 *xilinx_pcie_scan_bus(int nr, struct pci_sys_data *sys) { struct xilinx_pcie_port *port = sys_to_pcie(sys); struct pci_bus *bus; port->root_busno = sys->busnr; bus = pci_scan_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops, sys, &sys->resources); return bus; } /** * xilinx_pcie_parse_and_add_res - Add resources by parsing ranges * @port: PCIe port information * * Return: '0' on success and error value on failure */ static int xilinx_pcie_parse_and_add_res(struct xilinx_pcie_port *port) { 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 %pR\n", mem); continue; } err = request_resource(&iomem_resource, mem); if (err) goto free_resources; pci_add_resource_offset(&port->resources, mem, offset); } /* Get the bus range */ if (of_pci_parse_bus_range(node, &port->bus_range)) { 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; port->bus_range = (struct resource) { .name = node->name, .start = 0, .end = last, .flags = IORESOURCE_BUS, }; } /* Register bus resource */ pci_add_resource(&port->resources, &port->bus_range); return 0; free_resources: release_child_resources(&iomem_resource); list_for_each_entry(win, &port->resources, list) devm_kfree(dev, win->res); pci_free_resource_list(&port->resources); return err; } /** * 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; const char *type; int err; type = of_get_property(node, "device_type", NULL); if (!type || strcmp(type, "pci")) { dev_err(dev, "invalid \"device_type\" %s\n", type); return -EINVAL; } err = of_address_to_resource(node, 0, ®s); if (err) { dev_err(dev, "missing \"reg\" property\n"); return err; } port->reg_base = devm_ioremap_resource(dev, ®s); if (IS_ERR(port->reg_base)) return PTR_ERR(port->reg_base); 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; } 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; 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; } /* * Parse PCI ranges, configuration bus range and * request their resources */ INIT_LIST_HEAD(&port->resources); err = xilinx_pcie_parse_and_add_res(port); if (err) { dev_err(dev, "Failed adding resources\n"); return err; } platform_set_drvdata(pdev, port); /* Register the device */ 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, }; pci_common_init_dev(dev, &hw); 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("GPL v2");