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Ip=[149.199.60.83]; Helo=[xsj-pvapsmtpgw01] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR02MB3354 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org - Adding support for versal CPM as Root Port. - The Versal ACAP devices include CCIX-PCIe Module (CPM). The integrated block for CPM along with the integrated bridge can function as PCIe Root Port. - Versal CPM uses GICv3 ITS feature for assigning MSI/MSI-X vectors and handling MSI/MSI-X interrupts. - Bridge error and legacy interrupts in versal CPM are handled using versal CPM specific MISC interrupt line. Signed-off-by: Bharat Kumar Gogada Reported-by: kbuild test robot Reported-by: Dan Carpenter --- drivers/pci/controller/Kconfig | 8 + drivers/pci/controller/Makefile | 1 + drivers/pci/controller/pcie-xilinx-cpm.c | 511 +++++++++++++++++++++++++++++++ 3 files changed, 520 insertions(+) create mode 100644 drivers/pci/controller/pcie-xilinx-cpm.c diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index c77069c..eca496d 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -81,6 +81,14 @@ config PCIE_XILINX Say 'Y' here if you want kernel to support the Xilinx AXI PCIe Host Bridge driver. +config PCIE_XILINX_CPM + bool "Xilinx Versal CPM host bridge support" + depends on ARCH_ZYNQMP || COMPILE_TEST + help + Say 'Y' here if you want kernel to enable support the + Xilinx Versal CPM host Bridge driver.The driver supports + MSI/MSI-X interrupts using GICv3 ITS feature. + config PCI_XGENE bool "X-Gene PCIe controller" depends on ARM64 || COMPILE_TEST diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile index 3d4f597..6c936e9 100644 --- a/drivers/pci/controller/Makefile +++ b/drivers/pci/controller/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_PCI_HOST_COMMON) += pci-host-common.o obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o obj-$(CONFIG_PCIE_XILINX_NWL) += pcie-xilinx-nwl.o +obj-$(CONFIG_PCIE_XILINX_CPM) += pcie-xilinx-cpm.o obj-$(CONFIG_PCI_V3_SEMI) += pci-v3-semi.o obj-$(CONFIG_PCI_XGENE_MSI) += pci-xgene-msi.o obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o diff --git a/drivers/pci/controller/pcie-xilinx-cpm.c b/drivers/pci/controller/pcie-xilinx-cpm.c new file mode 100644 index 0000000..9c0852a --- /dev/null +++ b/drivers/pci/controller/pcie-xilinx-cpm.c @@ -0,0 +1,511 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * PCIe host controller driver for Xilinx Versal CPM DMA Bridge + * + * (C) Copyright 2019 - 2020, Xilinx, Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../pci.h" + +/* Register definitions */ +#define XILINX_CPM_PCIE_REG_IDR 0x00000E10 +#define XILINX_CPM_PCIE_REG_IMR 0x00000E14 +#define XILINX_CPM_PCIE_REG_PSCR 0x00000E1C +#define XILINX_CPM_PCIE_REG_RPSC 0x00000E20 +#define XILINX_CPM_PCIE_REG_RPEFR 0x00000E2C +#define XILINX_CPM_PCIE_REG_IDRN 0x00000E38 +#define XILINX_CPM_PCIE_REG_IDRN_MASK 0x00000E3C +#define XILINX_CPM_PCIE_MISC_IR_STATUS 0x00000340 +#define XILINX_CPM_PCIE_MISC_IR_ENABLE 0x00000348 +#define XILINX_CPM_PCIE_MISC_IR_LOCAL BIT(1) + +/* Interrupt registers definitions */ +#define XILINX_CPM_PCIE_INTR_LINK_DOWN BIT(0) +#define XILINX_CPM_PCIE_INTR_HOT_RESET BIT(3) +#define XILINX_CPM_PCIE_INTR_CFG_TIMEOUT BIT(8) +#define XILINX_CPM_PCIE_INTR_CORRECTABLE BIT(9) +#define XILINX_CPM_PCIE_INTR_NONFATAL BIT(10) +#define XILINX_CPM_PCIE_INTR_FATAL BIT(11) +#define XILINX_CPM_PCIE_INTR_INTX BIT(16) +#define XILINX_CPM_PCIE_INTR_MSI BIT(17) +#define XILINX_CPM_PCIE_INTR_SLV_UNSUPP BIT(20) +#define XILINX_CPM_PCIE_INTR_SLV_UNEXP BIT(21) +#define XILINX_CPM_PCIE_INTR_SLV_COMPL BIT(22) +#define XILINX_CPM_PCIE_INTR_SLV_ERRP BIT(23) +#define XILINX_CPM_PCIE_INTR_SLV_CMPABT BIT(24) +#define XILINX_CPM_PCIE_INTR_SLV_ILLBUR BIT(25) +#define XILINX_CPM_PCIE_INTR_MST_DECERR BIT(26) +#define XILINX_CPM_PCIE_INTR_MST_SLVERR BIT(27) +#define XILINX_CPM_PCIE_IMR_ALL_MASK 0x1FF39FF9 +#define XILINX_CPM_PCIE_IDR_ALL_MASK 0xFFFFFFFF +#define XILINX_CPM_PCIE_IDRN_MASK GENMASK(19, 16) +#define XILINX_CPM_PCIE_INTR_CFG_PCIE_TIMEOUT BIT(4) +#define XILINX_CPM_PCIE_INTR_CFG_ERR_POISON BIT(12) +#define XILINX_CPM_PCIE_INTR_PME_TO_ACK_RCVD BIT(15) +#define XILINX_CPM_PCIE_INTR_PM_PME_RCVD BIT(17) +#define XILINX_CPM_PCIE_INTR_SLV_PCIE_TIMEOUT BIT(28) +#define XILINX_CPM_PCIE_IDRN_SHIFT 16 + +/* Root Port Error FIFO Read Register definitions */ +#define XILINX_CPM_PCIE_RPEFR_ERR_VALID BIT(18) +#define XILINX_CPM_PCIE_RPEFR_REQ_ID GENMASK(15, 0) +#define XILINX_CPM_PCIE_RPEFR_ALL_MASK 0xFFFFFFFF + +/* Root Port Status/control Register definitions */ +#define XILINX_CPM_PCIE_REG_RPSC_BEN BIT(0) + +/* Phy Status/Control Register definitions */ +#define XILINX_CPM_PCIE_REG_PSCR_LNKUP BIT(11) + +/* ECAM definitions */ +#define ECAM_BUS_NUM_SHIFT 20 +#define ECAM_DEV_NUM_SHIFT 12 + +#define INTX_NUM 4 + +/** + * struct xilinx_cpm_pcie_port - PCIe port information + * @reg_base: Bridge Register Base + * @cpm_base: CPM SLCR Register Base + * @irq: Interrupt number + * @root_busno: Root Bus number + * @dev: Device pointer + * @leg_domain: Legacy IRQ domain pointer + * @irq_misc: Legacy and error interrupt number + */ +struct xilinx_cpm_pcie_port { + void __iomem *reg_base; + void __iomem *cpm_base; + u32 irq; + u8 root_busno; + struct device *dev; + struct irq_domain *leg_domain; + int irq_misc; +}; + +static inline u32 pcie_read(struct xilinx_cpm_pcie_port *port, u32 reg) +{ + return readl(port->reg_base + reg); +} + +static inline void pcie_write(struct xilinx_cpm_pcie_port *port, + u32 val, u32 reg) +{ + writel(val, port->reg_base + reg); +} + +static inline bool cpm_pcie_link_is_up(struct xilinx_cpm_pcie_port *port) +{ + return (pcie_read(port, XILINX_CPM_PCIE_REG_PSCR) & + XILINX_CPM_PCIE_REG_PSCR_LNKUP) ? 1 : 0; +} + +/** + * xilinx_cpm_pcie_clear_err_interrupts - Clear Error Interrupts + * @port: PCIe port information + */ +static void cpm_pcie_clear_err_interrupts(struct xilinx_cpm_pcie_port *port) +{ + unsigned long val = pcie_read(port, XILINX_CPM_PCIE_REG_RPEFR); + + if (val & XILINX_CPM_PCIE_RPEFR_ERR_VALID) { + dev_dbg(port->dev, "Requester ID %lu\n", + val & XILINX_CPM_PCIE_RPEFR_REQ_ID); + pcie_write(port, XILINX_CPM_PCIE_RPEFR_ALL_MASK, + XILINX_CPM_PCIE_REG_RPEFR); + } +} + +/** + * xilinx_cpm_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_cpm_pcie_valid_device(struct pci_bus *bus, + unsigned int devfn) +{ + struct xilinx_cpm_pcie_port *port = bus->sysdata; + + /* Check if link is up when trying to access downstream ports */ + if (bus->number != port->root_busno) + if (!cpm_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; + + return true; +} + +/** + * xilinx_cpm_pcie_map_bus - 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_cpm_pcie_map_bus(struct pci_bus *bus, + unsigned int devfn, int where) +{ + struct xilinx_cpm_pcie_port *port = bus->sysdata; + int relbus; + + if (!xilinx_cpm_pcie_valid_device(bus, devfn)) + return NULL; + + relbus = (bus->number << ECAM_BUS_NUM_SHIFT) | + (devfn << ECAM_DEV_NUM_SHIFT); + + return port->reg_base + relbus + where; +} + +/* PCIe operations */ +static struct pci_ops xilinx_cpm_pcie_ops = { + .map_bus = xilinx_cpm_pcie_map_bus, + .read = pci_generic_config_read, + .write = pci_generic_config_write, +}; + +/** + * xilinx_cpm_pcie_intx_map - Set the handler for the INTx and mark IRQ as valid + * @domain: IRQ domain + * @irq: Virtual IRQ number + * @hwirq: HW interrupt number + * + * Return: Always returns 0. + */ +static int xilinx_cpm_pcie_intx_map(struct irq_domain *domain, + unsigned int irq, irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq); + irq_set_chip_data(irq, domain->host_data); + irq_set_status_flags(irq, IRQ_LEVEL); + + return 0; +} + +/* INTx IRQ Domain operations */ +static const struct irq_domain_ops intx_domain_ops = { + .map = xilinx_cpm_pcie_intx_map, + .xlate = pci_irqd_intx_xlate, +}; + +/** + * xilinx_cpm_pcie_intr_handler - Interrupt Service Handler + * @irq: IRQ number + * @data: PCIe port information + * + * Return: IRQ_HANDLED on success and IRQ_NONE on failure + */ +static irqreturn_t xilinx_cpm_pcie_intr_handler(int irq, void *data) +{ + struct xilinx_cpm_pcie_port *port = + (struct xilinx_cpm_pcie_port *)data; + u32 val, mask, status, bit; + unsigned long intr_val; + + /* Read interrupt decode and mask registers */ + val = pcie_read(port, XILINX_CPM_PCIE_REG_IDR); + mask = pcie_read(port, XILINX_CPM_PCIE_REG_IMR); + + status = val & mask; + if (!status) + return IRQ_NONE; + + if (status & XILINX_CPM_PCIE_INTR_LINK_DOWN) + dev_warn(port->dev, "Link Down\n"); + + if (status & XILINX_CPM_PCIE_INTR_HOT_RESET) + dev_info(port->dev, "Hot reset\n"); + + if (status & XILINX_CPM_PCIE_INTR_CFG_TIMEOUT) + dev_warn(port->dev, "ECAM access timeout\n"); + + if (status & XILINX_CPM_PCIE_INTR_CORRECTABLE) { + dev_warn(port->dev, "Correctable error message\n"); + cpm_pcie_clear_err_interrupts(port); + } + + if (status & XILINX_CPM_PCIE_INTR_NONFATAL) { + dev_warn(port->dev, "Non fatal error message\n"); + cpm_pcie_clear_err_interrupts(port); + } + + if (status & XILINX_CPM_PCIE_INTR_FATAL) { + dev_warn(port->dev, "Fatal error message\n"); + cpm_pcie_clear_err_interrupts(port); + } + + if (status & XILINX_CPM_PCIE_INTR_INTX) { + /* Handle INTx Interrupt */ + intr_val = pcie_read(port, XILINX_CPM_PCIE_REG_IDRN); + intr_val = intr_val >> XILINX_CPM_PCIE_IDRN_SHIFT; + + for_each_set_bit(bit, &intr_val, INTX_NUM) + generic_handle_irq(irq_find_mapping(port->leg_domain, + bit)); + } + + if (status & XILINX_CPM_PCIE_INTR_SLV_UNSUPP) + dev_warn(port->dev, "Slave unsupported request\n"); + + if (status & XILINX_CPM_PCIE_INTR_SLV_UNEXP) + dev_warn(port->dev, "Slave unexpected completion\n"); + + if (status & XILINX_CPM_PCIE_INTR_SLV_COMPL) + dev_warn(port->dev, "Slave completion timeout\n"); + + if (status & XILINX_CPM_PCIE_INTR_SLV_ERRP) + dev_warn(port->dev, "Slave Error Poison\n"); + + if (status & XILINX_CPM_PCIE_INTR_SLV_CMPABT) + dev_warn(port->dev, "Slave Completer Abort\n"); + + if (status & XILINX_CPM_PCIE_INTR_SLV_ILLBUR) + dev_warn(port->dev, "Slave Illegal Burst\n"); + + if (status & XILINX_CPM_PCIE_INTR_MST_DECERR) + dev_warn(port->dev, "Master decode error\n"); + + if (status & XILINX_CPM_PCIE_INTR_MST_SLVERR) + dev_warn(port->dev, "Master slave error\n"); + + if (status & XILINX_CPM_PCIE_INTR_CFG_PCIE_TIMEOUT) + dev_warn(port->dev, "PCIe ECAM access timeout\n"); + + if (status & XILINX_CPM_PCIE_INTR_CFG_ERR_POISON) + dev_warn(port->dev, "ECAM poisoned completion received\n"); + + if (status & XILINX_CPM_PCIE_INTR_PME_TO_ACK_RCVD) + dev_warn(port->dev, "PME_TO_ACK message received\n"); + + if (status & XILINX_CPM_PCIE_INTR_PM_PME_RCVD) + dev_warn(port->dev, "PM_PME message received\n"); + + if (status & XILINX_CPM_PCIE_INTR_SLV_PCIE_TIMEOUT) + dev_warn(port->dev, "PCIe completion timeout received\n"); + + /* Clear the Interrupt Decode register */ + pcie_write(port, status, XILINX_CPM_PCIE_REG_IDR); + val = readl(port->cpm_base + XILINX_CPM_PCIE_MISC_IR_STATUS); + if (val) + writel(val, port->cpm_base + XILINX_CPM_PCIE_MISC_IR_STATUS); + + return IRQ_HANDLED; +} + +/** + * xilinx_cpm_pcie_init_irq_domain - Initialize IRQ domain + * @port: PCIe port information + * + * Return: '0' on success and error value on failure + */ +static int xilinx_cpm_pcie_init_irq_domain(struct xilinx_cpm_pcie_port *port) +{ + struct device *dev = port->dev; + struct device_node *node = dev->of_node; + struct device_node *pcie_intc_node; + + /* Setup INTx */ + pcie_intc_node = of_get_next_child(node, NULL); + if (!pcie_intc_node) { + dev_err(dev, "No PCIe Intc node found\n"); + return PTR_ERR(pcie_intc_node); + } + + port->leg_domain = irq_domain_add_linear(pcie_intc_node, INTX_NUM, + &intx_domain_ops, + port); + if (!port->leg_domain) { + dev_err(dev, "Failed to get a INTx IRQ domain\n"); + return PTR_ERR(port->leg_domain); + } + + return 0; +} + +/** + * xilinx_cpm_pcie_init_port - Initialize hardware + * @port: PCIe port information + */ +static void xilinx_cpm_pcie_init_port(struct xilinx_cpm_pcie_port *port) +{ + if (cpm_pcie_link_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_CPM_PCIE_IDR_ALL_MASK, + XILINX_CPM_PCIE_REG_IMR); + + /* Clear pending interrupts */ + pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_IDR) & + XILINX_CPM_PCIE_IMR_ALL_MASK, + XILINX_CPM_PCIE_REG_IDR); + + /* Enable all interrupts */ + pcie_write(port, XILINX_CPM_PCIE_IMR_ALL_MASK, + XILINX_CPM_PCIE_REG_IMR); + pcie_write(port, XILINX_CPM_PCIE_IDRN_MASK, + XILINX_CPM_PCIE_REG_IDRN_MASK); + + writel(XILINX_CPM_PCIE_MISC_IR_LOCAL, + port->cpm_base + XILINX_CPM_PCIE_MISC_IR_ENABLE); + /* Enable the Bridge enable bit */ + pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_RPSC) | + XILINX_CPM_PCIE_REG_RPSC_BEN, + XILINX_CPM_PCIE_REG_RPSC); +} + +static int xilinx_cpm_request_misc_irq(struct xilinx_cpm_pcie_port *port) +{ + struct device *dev = port->dev; + struct platform_device *pdev = to_platform_device(dev); + int err; + + port->irq_misc = platform_get_irq_byname(pdev, "misc"); + if (port->irq_misc <= 0) { + dev_err(dev, "Unable to find misc IRQ line\n"); + return port->irq_misc; + } + err = devm_request_irq(dev, port->irq_misc, + xilinx_cpm_pcie_intr_handler, + IRQF_SHARED | IRQF_NO_THREAD, + "xilinx-pcie", port); + if (err) { + dev_err(dev, "unable to request misc IRQ line %d\n", + port->irq_misc); + return err; + } + + return 0; +} + +/** + * xilinx_cpm_pcie_parse_dt - Parse Device tree + * @port: PCIe port information + * + * Return: '0' on success and error value on failure + */ +static int xilinx_cpm_pcie_parse_dt(struct xilinx_cpm_pcie_port *port) +{ + struct device *dev = port->dev; + struct resource *res; + int err; + struct platform_device *pdev = to_platform_device(dev); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg"); + port->reg_base = devm_ioremap_resource(dev, res); + if (IS_ERR(port->reg_base)) + return PTR_ERR(port->reg_base); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "cpm_slcr"); + port->cpm_base = devm_ioremap_resource(dev, res); + if (IS_ERR(port->cpm_base)) + return PTR_ERR(port->cpm_base); + + err = xilinx_cpm_request_misc_irq(port); + if (err) + return err; + + return 0; +} + +/** + * xilinx_cpm_pcie_probe - Probe function + * @pdev: Platform device pointer + * + * Return: '0' on success and error value on failure + */ +static int xilinx_cpm_pcie_probe(struct platform_device *pdev) +{ + struct xilinx_cpm_pcie_port *port; + struct device *dev = &pdev->dev; + struct pci_bus *bus; + struct pci_bus *child; + struct pci_host_bridge *bridge; + int err; + + bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port)); + if (!bridge) + return -ENODEV; + + port = pci_host_bridge_priv(bridge); + + port->dev = dev; + + err = xilinx_cpm_pcie_parse_dt(port); + if (err) { + dev_err(dev, "Parsing DT failed\n"); + return err; + } + + xilinx_cpm_pcie_init_port(port); + + err = xilinx_cpm_pcie_init_irq_domain(port); + if (err) { + dev_err(dev, "Failed creating IRQ Domain\n"); + return err; + } + + err = pci_parse_request_of_pci_ranges(dev, &bridge->windows, + &bridge->dma_ranges, NULL); + if (err) { + dev_err(dev, "Getting bridge resources failed\n"); + return err; + } + + bridge->dev.parent = dev; + bridge->sysdata = port; + bridge->busnr = port->root_busno; + bridge->ops = &xilinx_cpm_pcie_ops; + bridge->map_irq = of_irq_parse_and_map_pci; + bridge->swizzle_irq = pci_common_swizzle; + + err = pci_scan_root_bus_bridge(bridge); + if (err) + return err; + + bus = bridge->bus; + + pci_assign_unassigned_bus_resources(bus); + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); + pci_bus_add_devices(bus); + return 0; +} + +static const struct of_device_id xilinx_cpm_pcie_of_match[] = { + { .compatible = "xlnx,versal-cpm-host-1.00", }, + {} +}; + +static struct platform_driver xilinx_cpm_pcie_driver = { + .driver = { + .name = "xilinx-cpm-pcie", + .of_match_table = xilinx_cpm_pcie_of_match, + .suppress_bind_attrs = true, + }, + .probe = xilinx_cpm_pcie_probe, +}; + +builtin_platform_driver(xilinx_cpm_pcie_driver);