pcie-microsemi: Add support for the Vera-board root complex

Hi all,

I wrote this code and think this patch was submitted under Wesley's name accidentally.? I'd like to take it over going forwards.?

Daire

From: "Wesley W. Terpstra" <http://lists.infradead.org/mailman/listinfo/linux-riscv>

[Changes by AF:
- Rebase on 4.18 kernel
- Squash previous commits
]
Signed-off-by: Alistair Francis <http://lists.infradead.org/mailman/listinfo/linux-riscv>
---

 drivers/pci/controller/Kconfig????????? |?? 7 +
 drivers/pci/controller/Makefile???????? |?? 1 +
 drivers/pci/controller/pcie-microsemi.c | 778 ++++++++++++++++++++++++
 3 files changed, 786 insertions(+)
 create mode 100644 drivers/pci/controller/pcie-microsemi.c

drivers/pci/controller/Kconfig +7 -0

index 594f18a69424..6b16e8e511a3 100644
@@ -268,5 +268,12 @@ config VMD
 ?????? ??To compile this driver as a module, choose M here: the
 ?????? ??module will be called vmd.
 
+config PCIE_MICROSEMI
+?????? bool "Microsemi AXI PCIe host bridge support"
+?????? depends on OF_PCI
+?????? help
+?????? ? Say 'Y' here if you want kernel to support the Microsemi AXI PCIe
+?????? ? Host Bridge driver.
+
 source "drivers/pci/controller/dwc/Kconfig"
 endmenu

drivers/pci/controller/Makefile +1 -0

index 24322b92f200..aa2b7ca789c1 100644
@@ -28,6 +28,7 @@ obj-$(CONFIG_PCIE_ROCKCHIP_HOST) += pcie-rockchip-host.o
 obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o
 obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o
 obj-$(CONFIG_VMD) += vmd.o
+obj-$(CONFIG_PCIE_MICROSEMI) += pcie-microsemi.o
 # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW
 obj-y???????????????????????? += dwc/
 

drivers/pci/controller/pcie-microsemi.c new file +778 -0

new file mode 100644
index 000000000000..50d5dba3695f
@@ -0,0 +1,778 @@
+/*
+ * PCIe host controller driver for Microsemi AXI PCIe Bridge
+ *
+ * Copyright (c) 2018 - Microsemi.
+ *
+ * Based on:
+ *? pcie-rcar.c
+ *? pcie-xilinx.c
+ *? pcie-altera.c
+ *
+ * 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/bitmap.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/init.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>
+
+#include "../pci.h"
+
+/* ECAM definitions */
+#define ECAM_BUS_NUM_SHIFT????????????????? 20
+#define ECAM_DEV_NUM_SHIFT????????????????? 12
+
+/* Number of MSI IRQs */
+#define MICROSEMI_NUM_MSI_IRQS????????????? 32
+#define MICROSEMI_NUM_MSI_IRQS_CODED???????? 5
+
+/* PCIe Bridge Phy and Controller Phy offsets */
+#define MICROSEMI_PCIE0_BRIDGE_ADDR?????????????????? 0x00004000u
+#define MICROSEMI_PCIE0_CTRL_ADDR???????????????????? 0x00006000u
+
+#define MICROSEMI_PCIE1_BRIDGE_ADDR?????????????????? 0x00008000u
+#define MICROSEMI_PCIE1_CTRL_ADDR???????????????????? 0x0000A000u
+
+/* PCIe Controller Phy Regs */
+#define MICROSEMI_SEC_ERROR_INT?????????????????????? 0x28
+#define? SEC_ERROR_INT_TX_RAM_SEC_ERR_INT????????????? GENMASK(3,0)
+#define? SEC_ERROR_INT_RX_RAM_SEC_ERR_INT????????????? GENMASK(7,4)
+#define? SEC_ERROR_INT_PCIE2AXI_RAM_SEC_ERR_INT??????? GENMASK(11,8)
+#define? SEC_ERROR_INT_AXI2PCIE_RAM_SEC_ERR_INT??????? GENMASK(15,12)
+#define MICROSEMI_SEC_ERROR_INT_MASK????????????????? 0x2c
+#define MICROSEMI_DED_ERROR_INT?????????????????????? 0x30
+#define? DED_ERROR_INT_TX_RAM_DED_ERR_INT????????????? GENMASK(3,0)
+#define? DED_ERROR_INT_RX_RAM_DED_ERR_INT????????????? GENMASK(7,4)
+#define? DED_ERROR_INT_PCIE2AXI_RAM_DED_ERR_INT??????? GENMASK(11,8)
+#define? DED_ERROR_INT_AXI2PCIE_RAM_DED_ERR_INT??????? GENMASK(15,12)
+#define MICROSEMI_DED_ERROR_INT_MASK????????????????? 0x34
+#define MICROSEMI_ECC_CONTROL???????????????????????? 0x38
+#define? ECC_CONTROL_AXI2PCIE_RAM_ECC_BYPASS?????????? BIT(27)
+#define? ECC_CONTROL_PCIE2AXI_RAM_ECC_BYPASS?????????? BIT(26)
+#define? ECC_CONTROL_RX_RAM_ECC_BYPASS???????????????? BIT(25)
+#define? ECC_CONTROL_TX_RAM_ECC_BYPASS???????????????? BIT(24)
+#define MICROSEMI_LTSSM_STATE???????????????????????? 0x5c
+#define? MICROSEMI_LTSSM_L0_STATE????????????????????? 0x10
+#define MICROSEMI_PCIE_EVENT_INT????????????????????? 0x14c
+#define? PCIE_EVENT_INT_L2_EXIT_INT??????????????????? BIT(0)
+#define? PCIE_EVENT_INT_HOTRST_EXIT_INT??????????????? BIT(1)
+#define? PCIE_EVENT_INT_DLUP_EXIT_INT????????????????? BIT(2)
+#define? PCIE_EVENT_INT_L2_EXIT_INT_MASK?????????????? BIT(16)
+#define? PCIE_EVENT_INT_HOTRST_EXIT_INT_MASK?????????? BIT(17)
+#define? PCIE_EVENT_INT_DLUP_EXIT_INT_MASK???????????? BIT(18)
+
+/* PCIe Bridge Phy Regs */
+#define MICROSEMI_PCIE_PCI_IDS_DW1??????????????????? 0x9c
+#define MICROSEMI_IMASK_LOCAL???????????????????????? 0x180
+#define? MICROSEMI_PCIE_LOCAL_INT_ENABLE?????????????? 0x0F000000u
+#define? MICROSEMI_PCI_INTS??????????????????????????? 0x0F000000u
+#define? MICROSEMI_PM_MSI_INT_SHIFT??????????????????? 24
+#define? MICROSEMI_PCIE_ENABLE_MSI???????????????????? 0x10000000u
+#define? MICROSEMI_MSI_INT???????????????????????????? 0x10000000u
+#define? MICROSEMI_MSI_INT_SHIFT???????????????????? ??28
+#define MICROSEMI_ISTATUS_LOCAL?????????????????????? 0x184
+#define MICROSEMI_IMASK_HOST????????????????????????? 0x188
+#define MICROSEMI_ISTATUS_HOST??????????????????????? 0x18c
+#define MICROSEMI_ISTATUS_MSI???????????????????????? 0x194
+
+/* PCIe AXI slave table init defines */
+#define MICROSEMI_ATR0_AXI4_SLV0_SRCADDR_PARAM??????? 0x800u
+#define? ATR_SIZE_SHIFT??????????????????????????????? (1)
+#define? ATR_IMPL_ENABLE?????????????????????????????? (1)
+#define MICROSEMI_ATR0_AXI4_SLV0_SRC_ADDR???????????? 0x804u
+#define MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_LSB??????? 0x808u
+#define MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_UDW??????? 0x80cu
+#define MICROSEMI_ATR0_AXI4_SLV0_TRSL_PARAM?????????? 0x810u
+#define? MICROSEMI_PCIE_TX_RX_INTERFACE ???????????????0x00000000u
+#define? MICROSEMI_PCIE_CONFIG_INTERFACE?????????????? 0x00000001u
+
+
+#define MICROSEMI_ATR0_AXI4_SLV_SIZE????????????????? (32)
+
+/* PCIe Master table init defines */
+#define MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_31_12??????? 0x600u
+#define? MICROSEMI_ATR0_PCIE_WIN0_SIZE???????????????? (0x1f)
+#define? MICROSEMI_ATR0_PCIE_WIN0_SIZE_SHIFT?????????? (1)
+#define MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_63_32??????? 0x604u
+
+#define MICROSEMI_MSI_MSG_ADDR??????????????????????? 0x190u
+
+/* PCIe Config space MSI capability structure */
+#define MSI_CAP_CTRL_OFFSET???????????????? 0xE0u
+#define? MSI_ENABLE????????????????????????? (0x01u << 16)
+#define? MSI_ENABLE_MULTI??????????????????? (MICROSEMI_NUM_MSI_IRQS_CODED << 20)
+#define MSI_MSG_ADDR_OFFSET???????????????? 0xE4u
+#define MSI_MSG_UPPER_ADDR_OFFSET?????????? 0xE8u
+#define MSI_MSG_DATA_OFFSET???????????????? 0xF0u
+
+
+/**
+ * struct microsemi_pcie_port - PCIe port information
+ * @pcie_base_addr: IO Mapped Register Base
+ * @axi_base_addr: AMBA Mapped Register Base
+ * @irq: Interrupt number
+ * @root_busno: Root Bus number
+ * @dev: Device pointer
+ * @msi_domain: MSI IRQ domain pointer
+ * @leg_domain: Legacy IRQ domain pointer
+ * @resources: Bus Resources
+ */
+struct microsemi_pcie_port {
+??????? struct platform_device *pdev;
+??????? void __iomem *pcie_base_addr;
+??????? void __iomem *axi_base_addr;
+??????? int bridge;
+??????? u32 irq;
+??????? u8 root_busno;
+??????? struct device *dev;
+??????? struct irq_domain *msi_domain;
+??????? struct irq_domain *leg_domain;
+??????? struct list_head resources;
+};
+
+static DECLARE_BITMAP(msi_irq_in_use, MICROSEMI_NUM_MSI_IRQS);
+
+static inline u32 pcie_read(struct microsemi_pcie_port *port, u32 reg)
+{
+??????? return readl(port->pcie_base_addr + reg);
+}
+
+static inline void pcie_write(struct microsemi_pcie_port *port,
+??????????????????????????????? u32 val, u32 reg)
+{
+??????? writel(val, port->pcie_base_addr + reg);
+}
+
+static inline bool microsemi_pcie_link_up(struct microsemi_pcie_port *port)
+{
+??????? void *base_addr;
+
+??????? if(port->bridge == 0)
+??????????? base_addr = port->axi_base_addr + MICROSEMI_PCIE0_CTRL_ADDR;
+??????? else
+??????????? base_addr = port->axi_base_addr + MICROSEMI_PCIE1_CTRL_ADDR;
+
+??????? return (readl(base_addr + MICROSEMI_LTSSM_STATE)
+??????????????? & MICROSEMI_LTSSM_L0_STATE) ? 1 : 0;
+}
+
+/**
+ * microsemi_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 microsemi_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
+{
+??????? struct microsemi_pcie_port *port = bus->sysdata;
+
+??? ????/* Check if link is up when trying to access downstream ports */
+??????? if (bus->number != port->root_busno)
+??????????????? if (!microsemi_pcie_link_up(port))
+??????????????????????? return false;
+
+??????? /* Only one device down on each root port */
+??????? if (bus->number == port->root_busno && devfn > 0)
+??????????????? return false;
+
+??????? return true;
+}
+
+/**
+ * microsemi_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 *microsemi_pcie_map_bus(struct pci_bus *bus,
+??????????????????????????????????????????? unsigned int devfn, int where)
+{
+?? ?????struct microsemi_pcie_port *port = bus->sysdata;
+??????? int relbus;
+
+??????? if (!microsemi_pcie_valid_device(bus, devfn))
+??????????????? return NULL;
+
+??????? relbus = (bus->number << ECAM_BUS_NUM_SHIFT) |
+???????????????????? (devfn << ECAM_DEV_NUM_SHIFT);
+
+??????? return port->pcie_base_addr + relbus + where;
+}
+
+/* PCIe operations */
+static struct pci_ops microsemi_pcie_ops = {
+??????? .map_bus = microsemi_pcie_map_bus,
+??????? .read??????? = pci_generic_config_read,
+??????? .write??????? = pci_generic_config_write,
+};
+
+/* MSI functions */
+
+/**
+ * microsemi_pcie_destroy_msi - Free MSI number
+ * @irq: IRQ to be freed
+ */
+static void microsemi_pcie_destroy_msi(unsigned int irq)
+{
+??????? struct msi_desc *msi;
+??????? struct microsemi_pcie_port *port;
+??????? struct irq_data *d = irq_get_irq_data(irq);
+??????? irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+??????? if (!test_bit(hwirq, msi_irq_in_use)) {
+??????????????? msi = irq_get_msi_desc(irq);
+??????????????? port = msi_desc_to_pci_sysdata(msi);
+??????????????? dev_err(port->dev, "Trying to free unused MSI#%d\n", irq);
+??????? } else
+??????????????? clear_bit(hwirq, msi_irq_in_use);
+}
+
+/**
+ * microsemi_pcie_assign_msi - Allocate MSI number
+ *
+ * Return: A valid IRQ on success and error value on failure.
+ */
+static int microsemi_pcie_assign_msi(void)
+{
+??????? int pos;
+
+??????? pos = find_first_zero_bit(msi_irq_in_use, MICROSEMI_NUM_MSI_IRQS);
+??????? if (pos < MICROSEMI_NUM_MSI_IRQS)
+?????????????? ?set_bit(pos, msi_irq_in_use);
+??????? else
+??????????????? return -ENOSPC;
+
+??????? return pos;
+}
+
+/**
+ * microsemi_msi_teardown_irq - Destroy the MSI
+ * @chip: MSI Chip descriptor
+ * @irq: MSI IRQ to destroy
+ */
+static void microsemi_msi_teardown_irq(struct msi_controller *chip,
+?????????????????????????????????????? unsigned int irq)
+{
+??????? microsemi_pcie_destroy_msi(irq);
+??????? irq_dispose_mapping(irq);
+}
+
+/**
+ * microsemi_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 microsemi_pcie_msi_setup_irq(struct msi_controller *chip,
+?????????????? ?????????????????????????struct pci_dev *pdev,
+??????????????????????????????????????? struct msi_desc *desc)
+{
+??????? struct microsemi_pcie_port *port = pdev->bus->sysdata;
+??????? unsigned int irq;
+??????? int hwirq;
+??????? struct msi_msg msg;
+
+??????? hwirq = microsemi_pcie_assign_msi();
+??????? if (hwirq < 0)
+??????????????? return hwirq;
+
+??????? irq = irq_create_mapping(port->msi_domain, hwirq);
+??????? if (!irq)
+??????????????? return -EINVAL;
+
+??????? irq_set_msi_desc(irq, desc);
+
+??????? msg.address_hi = upper_32_bits(MICROSEMI_MSI_MSG_ADDR);
+??????? msg.address_lo = lower_32_bits(MICROSEMI_MSI_MSG_ADDR);
+??????? msg.data = hwirq;
+
+??????? pci_write_msi_msg(irq, &msg);
+
+??????? return 0;
+}
+
+/* MSI Chip Descriptor */
+static struct msi_controller microsemi_pcie_msi_chip = {
+??????? .setup_irq = microsemi_pcie_msi_setup_irq,
+??????? .teardown_irq = microsemi_msi_teardown_irq,
+};
+
+/* HW Interrupt Chip Descriptor */
+static struct irq_chip microsemi_msi_irq_chip = {
+?? ?????.name = "Microsemi PCIe MSI",
+??????? .irq_enable = pci_msi_unmask_irq,
+??????? .irq_disable = pci_msi_mask_irq,
+??????? .irq_mask = pci_msi_mask_irq,
+??????? .irq_unmask = pci_msi_unmask_irq,
+};
+
+/**
+ * microsemi_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 microsemi_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
+?????????????? ???????????????????irq_hw_number_t hwirq)
+{
+??????? irq_set_chip_and_handler(irq,
+??????????????????????????????? &microsemi_msi_irq_chip, handle_simple_irq);
+??????? irq_set_chip_data(irq, domain->host_data);
+
+??????? return 0;
+}
+
+/* IRQ Domain operations */
+static const struct irq_domain_ops msi_domain_ops = {
+??????? .map = microsemi_pcie_msi_map,
+};
+
+/**
+ * microsemi_pcie_enable_msi - Enable MSI support
+ * @port: PCIe port information
+ */
+static void microsemi_pcie_enable_msi(struct microsemi_pcie_port *port)
+{
+??????? u32 cap_ctrl;
+
+??????? cap_ctrl = pcie_read(port, MSI_CAP_CTRL_OFFSET);
+
+??????? pcie_write(port, cap_ctrl | MSI_ENABLE_MULTI | 
+?????????????????????? MSI_ENABLE, MSI_CAP_CTRL_OFFSET);
+??????? pcie_write(port, MICROSEMI_MSI_MSG_ADDR, MSI_MSG_ADDR_OFFSET);
+}
+
+/* INTx Functions */
+
+/**
+ * microsemi_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 microsemi_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);
+
+??????? return 0;
+}
+
+/* INTx IRQ Domain operations */
+static const struct irq_domain_ops intx_domain_ops = {
+??????? .map = microsemi_pcie_intx_map,
+??????? .xlate = pci_irqd_intx_xlate,
+};
+
+/* PCIe HW Functions */
+
+/**
+ * microsemi_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 microsemi_pcie_intr_handler(int irq, void *data)
+{
+??????? struct microsemi_pcie_port *port = (struct microsemi_pcie_port *) data;
+??????? struct device *dev = port->dev;
+??????? unsigned long status;
+??????? unsigned long msi;
+??????? u32 bit;
+??????? u32 virq;
+??????? void *base_addr;
+
+??????? if(port->bridge == 0)
+??????????? base_addr = port->axi_base_addr + MICROSEMI_PCIE0_BRIDGE_ADDR;
+??????? else
+??????????? base_addr = port->axi_base_addr + MICROSEMI_PCIE1_BRIDGE_ADDR;
+
+??????? status = readl(base_addr + MICROSEMI_ISTATUS_LOCAL);
+
+??????? status = (status & MICROSEMI_PCI_INTS) >> MICROSEMI_PM_MSI_INT_SHIFT;
+??????? for_each_set_bit(bit, &status, PCI_NUM_INTX) {
+??????????????? /* clear that interrupt bit */
+???????? ???????writel(1 << (bit+MICROSEMI_PM_MSI_INT_SHIFT),
+???????????????????????? base_addr + MICROSEMI_ISTATUS_LOCAL);
+??????????????? virq = irq_find_mapping(port->leg_domain, bit);
+
+??????????????? if (virq)
+??????????????????????? generic_handle_irq(virq);
+??????????????? else
+??????????????????????? dev_err(dev, "unexpected IRQ, INT%d\n", bit);
+??????? }
+
+??????? status = readl(base_addr + MICROSEMI_ISTATUS_LOCAL);
+??????? if (status & MICROSEMI_MSI_INT) {
+??????????????? // Clear the ISTATUS MSI bit
+??????????????? writel((1 << MICROSEMI_MSI_INT_SHIFT), base_addr + MICROSEMI_ISTATUS_LOCAL);
+??????????????? msi = readl(base_addr + MICROSEMI_ISTATUS_MSI);
+??????????????? for_each_set_bit(bit, &msi, MICROSEMI_NUM_MSI_IRQS) {
+????????????????? ??????/* clear that MSI interrupt bit */
+??????????????????????? writel((1 << bit),
+??????????????????????????????? base_addr + MICROSEMI_ISTATUS_MSI);
+??????????????????????? virq = irq_find_mapping(port->msi_domain, bit);
+??????????????????????? if (virq)
+??????????????????????????????? generic_handle_irq(virq);
+??????????????????????? else
+??????????????????????????????? dev_err(dev, "unexpected IRQ, INT%d\n", bit);
+??????????????? }
+??????? }
+
+??????? return IRQ_HANDLED;
+}
+
+/**
+ * microsemi_pcie_init_irq_domain - Initialize IRQ domain
+ * @port: PCIe port information
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int microsemi_pcie_init_irq_domain(struct microsemi_pcie_port *port)
+{
+??????? struct device *dev = port->dev;
+??????? struct device_node *node = dev->of_node;
+??????? struct device_node *pcie_intc_node;
+??????? void *bridge_base_addr;
+
+??????? if(port->bridge == 0) {
+??????????????? bridge_base_addr =? port->axi_base_addr + MICROSEMI_PCIE0_BRIDGE_ADDR;
+??????? } else {
+??????????????? bridge_base_addr =? port->axi_base_addr + MICROSEMI_PCIE1_BRIDGE_ADDR;
+??????? }
+
+??????? /* 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 -ENODEV;
+??????? }
+??????? dev_info(dev, "Intc node foundi %s\n", pcie_intc_node->name);
+
+??????? port->leg_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
+???????????????????????????????????????????????? &intx_domain_ops,
+???????????????????????????????????????????????? port);
+??????? if (!port->leg_domain) {
+??????????????? dev_err(dev, "Failed to get a INTx IRQ domain\n");
+??? ????????????return -ENODEV;
+??????? }
+
+??????? /* Setup MSI */
+??????? if (IS_ENABLED(CONFIG_PCI_MSI)) {
+??????????????? port->msi_domain = irq_domain_add_linear(node,
+??????????????????????????????????????????????? MICROSEMI_NUM_MSI_IRQS,
+???????? ???????????????????????????????????????&msi_domain_ops,
+??????????????????????????????????????????????? &microsemi_pcie_msi_chip);
+??????????????? if (!port->msi_domain) {
+??????????????????????? dev_err(dev, "Failed to get a MSI IRQ domain\n");
+????? ??????????????????return -ENODEV;
+??????????????? }
+??????????????? microsemi_pcie_enable_msi(port);
+??????? }
+
+??????? /* Enable interrupts */
+??????? writel(MICROSEMI_PCIE_ENABLE_MSI | MICROSEMI_PCIE_LOCAL_INT_ENABLE,
+??????????????? bridge_base_addr + MICROSEMI_IMASK_LOCAL);
+
+??????? return 0;
+}
+
+/**
+ * microsemi_pcie_init_port - Parse Device tree, Initialize hardware
+ * @port: PCIe port information
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int microsemi_pcie_init_port(struct microsemi_pcie_port *port)
+{
+??????? struct device *dev = port->dev;
+??????? struct device_node *node = dev->of_node;
+??????? struct of_pci_range_parser parser;
+??????? struct of_pci_range range;
+??????? struct resource regs;
+??????? struct resource regs1;
+??????? resource_size_t size;
+??????? u32 atr_sz;
+??????? const char *type;
+??????? int err;
+??????? void *bridge_base_addr;
+??????? void *ctrl_base_addr;
+??????? u32 val;
+??????? int index = 1;
+
+??????? type = of_get_property(node, "device_type", NULL);
+??????? if (!type || strcmp(type, "pci")) {
+??????????????? dev_err(dev, "invalid \"device_type\" %s\n", type);
+??????????????? return -EINVAL;
+??????? }
+
+??????? /* Only supporting bridge 1 */
+??? ????port->bridge = 1;
+
+??????? err = of_address_to_resource(node, 0, &regs);
+??????? if (err) {
+??????????????? dev_err(dev, "missing \"reg\" property\n");
+??????????????? return err;
+??????? }
+
+??????? port->pcie_base_addr = devm_pci_remap_cfg_resource(dev, &regs);
+??????? if (IS_ERR(port->pcie_base_addr))
+??????????????? return PTR_ERR(port->pcie_base_addr);
+
+??????? err = of_address_to_resource(node, 1, &regs1);
+??????? if (err) {
+??????????????? dev_err(dev, "missing \"reg\" property\n");
+??????????????? return err;
+??????? }
+
+??????? port->axi_base_addr = devm_ioremap_resource(dev, &regs1);
+??????? if (IS_ERR(port->axi_base_addr))
+??????????????? return PTR_ERR(port->axi_base_addr);
+
+??????? if(port->bridge == 0) {
+?????????????? ?bridge_base_addr =? port->axi_base_addr + MICROSEMI_PCIE0_BRIDGE_ADDR;
+??????????????? ctrl_base_addr = port->axi_base_addr + MICROSEMI_PCIE0_CTRL_ADDR;
+??????? } else {
+??????????????? bridge_base_addr =? port->axi_base_addr + MICROSEMI_PCIE1_BRIDGE_ADDR;
+??????????????? ctrl_base_addr = port->axi_base_addr + MICROSEMI_PCIE1_CTRL_ADDR;
+??????? }
+
+??????? port->irq = irq_of_parse_and_map(node, 0);
+
+??????? err = devm_request_irq(dev, port->irq, microsemi_pcie_intr_handler,
+?????????????????????? ????????IRQF_SHARED | IRQF_NO_THREAD,
+?????????????????????????????? "microsemi-pcie", port);
+??????? if (err) {
+??????????????? dev_err(dev, "unable to request irq %d\n", port->irq);
+??????????????? return err;
+??????? }
+
+??????? /* Clear and Disable interrupts */
+??????? val = ECC_CONTROL_AXI2PCIE_RAM_ECC_BYPASS
+??????????? | ECC_CONTROL_PCIE2AXI_RAM_ECC_BYPASS
+??????????? | ECC_CONTROL_RX_RAM_ECC_BYPASS
+??????????? | ECC_CONTROL_TX_RAM_ECC_BYPASS;
+??????? writel(val, ctrl_base_addr + MICROSEMI_ECC_CONTROL);
+
+??????? val = PCIE_EVENT_INT_L2_EXIT_INT
+??????????? | PCIE_EVENT_INT_HOTRST_EXIT_INT
+??????????? | PCIE_EVENT_INT_DLUP_EXIT_INT
+??????????? | PCIE_EVENT_INT_L2_EXIT_INT_MASK
+??????????? | PCIE_EVENT_INT_HOTRST_EXIT_INT_MASK
+??????????? | PCIE_EVENT_INT_DLUP_EXIT_INT_MASK;
+??????? writel(val, ctrl_base_addr + MICROSEMI_PCIE_EVENT_INT);
+
+??????? val = SEC_ERROR_INT_TX_RAM_SEC_ERR_INT
+??????????? | SEC_ERROR_INT_RX_RAM_SEC_ERR_INT
+??????????? | SEC_ERROR_INT_PCIE2AXI_RAM_SEC_ERR_INT
+??????????? | SEC_ERROR_INT_AXI2PCIE_RAM_SEC_ERR_INT;
+??????? writel(val, ctrl_base_addr + MICROSEMI_SEC_ERROR_INT);
+??????? writel(val, ctrl_base_addr + MICROSEMI_SEC_ERROR_INT_MASK);
+
+??????? val = DED_ERROR_INT_TX_RAM_DED_ERR_INT
+??????????? | DED_ERROR_INT_RX_RAM_DED_ERR_INT
+??????????? | DED_ERROR_INT_PCIE2AXI_RAM_DED_ERR_INT
+??????????? | DED_ERROR_INT_AXI2PCIE_RAM_DED_ERR_INT;
+??????? writel(val, ctrl_base_addr + MICROSEMI_DED_ERROR_INT);
+??????? writel(val, ctrl_base_addr + MICROSEMI_DED_ERROR_INT_MASK);
+
+??????? writel(0x00000000, bridge_base_addr + MICROSEMI_IMASK_LOCAL);
+??????? writel(GENMASK(31,0), bridge_base_addr + MICROSEMI_ISTATUS_LOCAL);
+??????? writel(0x00000000, bridge_base_addr + MICROSEMI_IMASK_HOST);
+??????? writel(GENMASK(31,0), bridge_base_addr + MICROSEMI_ISTATUS_HOST);
+
+??????? dev_info(dev, "interrupt disabled\n");
+
+??????? /* Configure Address Translation Table 0 for pcie config space */
+??????? writel(MICROSEMI_PCIE_CONFIG_INTERFACE,
+??????????????? bridge_base_addr + MICROSEMI_ATR0_AXI4_SLV0_TRSL_PARAM);
+
+??????? size = resource_size(&regs);
+
+??????? atr_sz = find_first_bit((const unsigned long *)&size, 64) - 1;
+
+??????? writel(lower_32_bits(regs.start) | atr_sz << ATR_SIZE_SHIFT | ATR_IMPL_ENABLE,
+??????????????? bridge_base_addr + MICROSEMI_ATR0_AXI4_SLV0_SRCADDR_PARAM);
+
+??????? //writel(upper_32_bits(regs.start),
+??????? //??? bridge_base_addr + MICROSEMI_ATR0_AXI4_SLV0_SRC_ADDR);
+
+??????? writel(lower_32_bits(regs.start),
+??????????????? bridge_base_addr + MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_LSB);
+
+??????? //writel(upper_32_bits(regs.start),
+??????? //??????? bridge_base_addr + MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_UDW);
+
+???? ???if (of_pci_range_parser_init(&parser, node)) {
+??????????????? dev_err(dev, "missing \"ranges\" property\n");
+??????????????? return -EINVAL;
+??????? }
+
+
+??????? for_each_of_pci_range(&parser, &range) {
+??????????????? switch (range.flags & IORESOURCE_TYPE_BITS) {
+??????????????? case IORESOURCE_MEM:
+??????????????????? size = range.size;
+??????????????????? atr_sz = find_first_bit((const unsigned long *)&size, 64) - 1;
+
+??????????????????? /* Configure Address Translation Table index for pcie mem space */
+??????????????????? writel(MICROSEMI_PCIE_TX_RX_INTERFACE,
+??????????????????????? bridge_base_addr + (index * MICROSEMI_ATR0_AXI4_SLV_SIZE ) + 
+??????????????????????? MICROSEMI_ATR0_AXI4_SLV0_TRSL_PARAM);
+
+??????????????????? writel(lower_32_bits(range.cpu_addr) | atr_sz << ATR_SIZE_SHIFT | ATR_IMPL_ENABLE,
+??????????????????????? bridge_base_addr + (index * MICROSEMI_ATR0_AXI4_SLV_SIZE ) + 
+??????????????????????? MICROSEMI_ATR0_AXI4_SLV0_SRCADDR_PARAM);
+
+??????????????????? //writel(upper_32_bits(range.cpu_addr),
+??????????????????? //??? bridge_base_addr + (index * MICROSEMI_ATR0_AXI4_SLV_SIZE ) + 
+??????????????????? //??? MICROSEMI_ATR0_AXI4_SLV0_SRC_ADDR);
+
+??????????????????? writel(lower_32_bits(range.pci_addr),
+? ??????????????????????bridge_base_addr + (index * MICROSEMI_ATR0_AXI4_SLV_SIZE ) + 
+??????????????????????? MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_LSB);
+
+??????????????????? //writel(upper_32_bits(range.pci_addr),
+??????????????????? //??? bridge_base_addr + (index * MICROSEMI_ATR0_AXI4_SLV_SIZE ) + 
+??????????????????? //??? MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_UDW);
+
+??????????????????? break;
+??????????????? }
+??????????????? index++;
+??????? }
+
+??????? writel(readl(bridge_base_addr + MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_31_12)
+??????????????? | MICROSEMI_ATR0_PCIE_WIN0_SIZE << MICROSEMI_ATR0_PCIE_WIN0_SIZE_SHIFT,
+??????????????? bridge_base_addr + MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_31_12);
+
+??????? writel(0x0, bridge_base_addr + MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_63_32);
+
+??????? writel((readl(bridge_base_addr + MICROSEMI_PCIE_PCI_IDS_DW1) & 0xffff)
+??????????????? | (PCI_CLASS_BRIDGE_PCI << 16),
+??????????????? bridge_base_addr + MICROSEMI_PCIE_PCI_IDS_DW1);
+
+??????? return 0;
+}
+
+/**
+ * microsemi_pcie_probe - Probe function
+ * @pdev: Platform device pointer
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int microsemi_pcie_probe(struct platform_device *pdev)
+{
+??????? struct device *dev = &pdev->dev;
+??????? struct microsemi_pcie_port *port;
+??????? struct pci_bus *bus, *child;
+??????? struct pci_host_bridge *bridge;
+??????? int err;
+??????? resource_size_t iobase = 0;
+??????? LIST_HEAD(res);
+
+??????? 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);
+
+??????? port->dev = dev;
+??????? port->pdev = pdev;
+
+??????? err = microsemi_pcie_init_port(port);
+??????? if (err) {
+??????????????? dev_err(dev, "Pcie port initialization failed\n");
+??????????????? return err;
+??????? }
+
+
+??????? err = microsemi_pcie_init_irq_domain(port);
+??????? if (err) {
+??????????????? dev_err(dev, "Failed creating IRQ Domain\n");
+??????????????? return err;
+??????? }
+
+??????? err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &res,
+?????????????????????????????????????????????? &iobase);
+??????? if (err) {
+??????????????? dev_err(dev, "Getting bridge resources failed\n");
+??????????????? return err;
+??????? }
+
+??????? err = devm_request_pci_bus_resources(dev, &res);
+??????? if (err)
+??????????????? goto error;
+
+
+??????? list_splice_init(&res, &bridge->windows);
+??????? bridge->dev.parent = dev;
+??????? bridge->sysdata = port;
+??????? bridge->busnr = 0;
+??????? bridge->ops = &microsemi_pcie_ops;
+??????? bridge->map_irq = of_irq_parse_and_map_pci;
+??????? bridge->swizzle_irq = pci_common_swizzle;
+
+#ifdef CONFIG_PCI_MSI
+??????? microsemi_pcie_msi_chip.dev = dev;
+??????? bridge->msi = &microsemi_pcie_msi_chip;
+#endif
+??????? err = pci_scan_root_bus_bridge(bridge);
+??????? dev_info(dev, "pci_scan_root_bus_bridge done\n");
+??????? if (err < 0)
+??????????????? goto error;
+
+??????? 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;
+
+error:
+??????? pci_free_resource_list(&res);
+??????? return err;
+}
+
+static const struct of_device_id microsemi_pcie_of_match[] = {
+??????? { .compatible = "ms-pf,axi-pcie-host", },
+??????? {}
+};
+
+static struct platform_driver microsemi_pcie_driver = {
+??????? .driver = {
+??????????????? .name = "microsemi-pcie",
+??????????????? .of_match_table = microsemi_pcie_of_match,
+??????????????? .suppress_bind_attrs = true,
+??????? },
+??????? .probe = microsemi_pcie_probe,
+};
+builtin_platform_driver(microsemi_pcie_driver);

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2.17.1



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(quoted diff) +9 -0

+        /* Setup MSI */
+        if (IS_ENABLED(CONFIG_PCI_MSI)) {
+                port->msi_domain = irq_domain_add_linear(node,
+                                                MICROSEMI_NUM_MSI_IRQS,
+                                                &msi_domain_ops,
+                                                &microsemi_pcie_msi_chip);
+                if (!port->msi_domain) {
+                        dev_err(dev, "Failed to get a MSI IRQ domain\n");
+                        return -ENODEV;

Hi all,

I wrote this code and think this patch was submitted under Wesley's name accidentally.? I'd like to take it over going forwards.?

index 000000000000..50d5dba3695f

drivers/pci/controller/pcie-microsemi.c new file +4 -0

@@ -0,0 +1,778 @@
+/*
+ * PCIe host controller driver for Microsemi AXI PCIe Bridge
+ *
+ * Copyright (c) 2018 - Microsemi.