[PATCH 2/2] PCI: xilinx-xdma: Add Xilinx XDMA Root Port driver

Thippeswamy Havalige
2023-04-17T10:35:11Z

Add support for Xilinx XDMA Soft IP core as Root Port.

The Zynq UltraScale+ MPSoCs devices support XDMA soft IP module in
programmable logic.

The integrated XDMA soft IP block has integrated bridge function that
can act as PCIe Root Port.

Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@amd.com>
Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@amd.com>
---
drivers/pci/controller/Kconfig | 10 +
drivers/pci/controller/Makefile | 1 +
drivers/pci/controller/pcie-xdma-pl.c | 877 ++++++++++++++++++++++++++
3 files changed, 888 insertions(+)
create mode 100644 drivers/pci/controller/pcie-xdma-pl.c

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 42654035654a..edc7812673ff 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -113,6 +113,16 @@ config PCIE_XILINX_CPM
Say 'Y' here if you want kernel support for the
Xilinx Versal CPM host bridge.

+config PCIE_XILINX_DMA
+ bool "Xilinx DMA PL PCIe host bridge support"
+ depends on ARCH_ZYNQMP || COMPILE_TEST
+ depends on PCI_MSI
+ select PCI_HOST_COMMON
+ help
+ Say 'Y' here if you want kernel to enable support for the
+ XILINX PL PCIe host bridge support, this PCIe controller
+ includes DMA PL component.
+
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 37c8663de7fe..567890c7952e 100644
--- a/drivers/pci/controller/Makefile
+++ b/drivers/pci/controller/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_PCIE_RCAR_HOST) += pcie-rcar.o pcie-rcar-host.o
obj-$(CONFIG_PCIE_RCAR_EP) += pcie-rcar.o pcie-rcar-ep.o
obj-$(CONFIG_PCI_HOST_COMMON) += pci-host-common.o
obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
+obj-$(CONFIG_PCIE_XILINX_DMA) += pcie-xdma-pl.o
obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o
obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o
obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
diff --git a/drivers/pci/controller/pcie-xdma-pl.c b/drivers/pci/controller/pcie-xdma-pl.c
new file mode 100644
index 000000000000..487d2be3bf45
--- /dev/null
+++ b/drivers/pci/controller/pcie-xdma-pl.c
@@ -0,0 +1,877 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PCIe host controller driver for Xilinx XDMA PCIe Bridge
+ *
+ * Copyright (C) 2017 Xilinx, Inc. All rights reserved.
+ */
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/pci-ecam.h>
+
+#include "../pci.h"
+
+/* Register definitions */
+#define XILINX_PCIE_DMA_REG_IDR 0x00000138
+#define XILINX_PCIE_DMA_REG_IMR 0x0000013c
+#define XILINX_PCIE_DMA_REG_PSCR 0x00000144
+#define XILINX_PCIE_DMA_REG_RPSC 0x00000148
+#define XILINX_PCIE_DMA_REG_MSIBASE1 0x0000014c
+#define XILINX_PCIE_DMA_REG_MSIBASE2 0x00000150
+#define XILINX_PCIE_DMA_REG_RPEFR 0x00000154
+#define XILINX_PCIE_DMA_REG_IDRN 0x00000160
+#define XILINX_PCIE_DMA_REG_IDRN_MASK 0x00000164
+#define XILINX_PCIE_DMA_REG_MSI_LOW 0x00000170
+#define XILINX_PCIE_DMA_REG_MSI_HI 0x00000174
+#define XILINX_PCIE_DMA_REG_MSI_LOW_MASK 0x00000178
+#define XILINX_PCIE_DMA_REG_MSI_HI_MASK 0x0000017c
+
+/* Interrupt registers definitions */
+#define XILINX_PCIE_DMA_INTR_LINK_DOWN 0
+#define XILINX_PCIE_DMA_INTR_HOT_RESET 3
+#define XILINX_PCIE_DMA_INTR_CFG_TIMEOUT 8
+#define XILINX_PCIE_DMA_INTR_CORRECTABLE 9
+#define XILINX_PCIE_DMA_INTR_NONFATAL 10
+#define XILINX_PCIE_DMA_INTR_FATAL 11
+#define XILINX_PCIE_DMA_INTR_INTX 16
+#define XILINX_PCIE_DMA_INTR_MSI 17
+#define XILINX_PCIE_DMA_INTR_SLV_UNSUPP 20
+#define XILINX_PCIE_DMA_INTR_SLV_UNEXP 21
+#define XILINX_PCIE_DMA_INTR_SLV_COMPL 22
+#define XILINX_PCIE_DMA_INTR_SLV_ERRP 23
+#define XILINX_PCIE_DMA_INTR_SLV_CMPABT 24
+#define XILINX_PCIE_DMA_INTR_SLV_ILLBUR 25
+#define XILINX_PCIE_DMA_INTR_MST_DECERR 26
+#define XILINX_PCIE_DMA_INTR_MST_SLVERR 27
+
+#define IMR(x) BIT(XILINX_PCIE_DMA_INTR_ ##x)
+
+#define XILINX_PCIE_DMA_INTR_IMR_ALL_MASK \
+ ( \
+ IMR(LINK_DOWN) | \
+ IMR(HOT_RESET) | \
+ IMR(CFG_TIMEOUT) | \
+ IMR(CORRECTABLE) | \
+ IMR(NONFATAL) | \
+ IMR(FATAL) | \
+ IMR(INTX) | \
+ IMR(MSI) | \
+ IMR(SLV_UNSUPP) | \
+ IMR(SLV_UNEXP) | \
+ IMR(SLV_COMPL) | \
+ IMR(SLV_ERRP) | \
+ IMR(SLV_CMPABT) | \
+ IMR(SLV_ILLBUR) | \
+ IMR(MST_DECERR) | \
+ IMR(MST_SLVERR) | \
+ )
+
+#define XILINX_PCIE_DMA_IMR_ALL_MASK 0x0FF30FE9
+#define XILINX_PCIE_DMA_IDR_ALL_MASK 0xFFFFFFFF
+#define XILINX_PCIE_DMA_IDRN_MASK GENMASK(19, 16)
+
+/* Root Port Error Register definitions */
+#define XILINX_PCIE_DMA_RPEFR_ERR_VALID BIT(18)
+#define XILINX_PCIE_DMA_RPEFR_REQ_ID GENMASK(15, 0)
+#define XILINX_PCIE_DMA_RPEFR_ALL_MASK 0xFFFFFFFF
+
+/* Root Port Interrupt Register definitions */
+#define XILINX_PCIE_DMA_IDRN_SHIFT 16
+
+/* Root Port Status/control Register definitions */
+#define XILINX_PCIE_DMA_REG_RPSC_BEN BIT(0)
+
+/* Phy Status/Control Register definitions */
+#define XILINX_PCIE_DMA_REG_PSCR_LNKUP BIT(11)
+
+/* Number of MSI IRQs */
+#define XILINX_NUM_MSI_IRQS 64
+
+struct xilinx_msi {
+ struct irq_domain *msi_domain;
+ unsigned long *bitmap;
+ struct irq_domain *dev_domain;
+ struct mutex lock; /* protect bitmap variable */
+ int irq_msi0;
+ int irq_msi1;
+};
+
+/**
+ * struct xilinx_pcie_dma - PCIe port information
+ * @reg_base: IO Mapped Register Base
+ * @irq: Interrupt number
+ * @cfg: Holds mappings of config space window
+ * @root_busno: Root Bus number
+ * @dev: Device pointer
+ * @phys_reg_base: Physical address of reg base
+ * @leg_domain: Legacy IRQ domain pointer
+ * @pldma_domain: PL DMA IRQ domain pointer
+ * @resources: Bus Resources
+ * @msi: MSI information
+ * @irq_misc: Legacy and error interrupt number
+ * @intx_irq: legacy interrupt number
+ * @lock: lock protecting shared register access
+ */
+struct xilinx_pcie_dma {
+ void __iomem *reg_base;
+ u32 irq;
+ struct pci_config_window *cfg;
+ u8 root_busno;
+ struct device *dev;
+ phys_addr_t phys_reg_base;
+ struct irq_domain *leg_domain;
+ struct irq_domain *pldma_domain;
+ struct list_head resources;
+ struct xilinx_msi msi;
+ int irq_misc;
+ int intx_irq;
+ raw_spinlock_t lock;
+};
+
+static inline u32 pcie_read(struct xilinx_pcie_dma *port, u32 reg)
+{
+ return readl(port->reg_base + reg);
+}
+
+static inline void pcie_write(struct xilinx_pcie_dma *port, u32 val, u32 reg)
+{
+ writel(val, port->reg_base + reg);
+}
+
+static inline bool xilinx_pcie_dma_linkup(struct xilinx_pcie_dma *port)
+{
+ return (pcie_read(port, XILINX_PCIE_DMA_REG_PSCR) &
+ XILINX_PCIE_DMA_REG_PSCR_LNKUP) ? 1 : 0;
+}
+
+/**
+ * xilinx_pcie_dma_clear_err_interrupts - Clear Error Interrupts
+ * @port: PCIe port information
+ */
+static void xilinx_pcie_dma_clear_err_interrupts(struct xilinx_pcie_dma *port)
+{
+ unsigned long val = pcie_read(port, XILINX_PCIE_DMA_REG_RPEFR);
+
+ if (val & XILINX_PCIE_DMA_RPEFR_ERR_VALID) {
+ dev_dbg(port->dev, "Requester ID %lu\n",
+ val & XILINX_PCIE_DMA_RPEFR_REQ_ID);
+ pcie_write(port, XILINX_PCIE_DMA_RPEFR_ALL_MASK,
+ XILINX_PCIE_DMA_REG_RPEFR);
+ }
+}
+
+/**
+ * xilinx_pcie_dma_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_dma_valid_device(struct pci_bus *bus, unsigned int devfn)
+{
+ struct xilinx_pcie_dma *port = bus->sysdata;
+
+ /* Check if link is up when trying to access downstream ports */
+ if (bus->number != port->root_busno)
+ if (!xilinx_pcie_dma_linkup(port))
+ return false;
+
+ /* Only one device down on each root port */
+ if (bus->number == port->root_busno && devfn > 0)
+ return false;
+
+ return true;
+}
+
+/**
+ * xilinx_pcie_dma_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_pcie_dma_map_bus(struct pci_bus *bus,
+ unsigned int devfn, int where)
+{
+ struct xilinx_pcie_dma *port = bus->sysdata;
+ int relbus;
+
+ if (!xilinx_pcie_dma_valid_device(bus, devfn))
+ return NULL;
+
+ relbus = (bus->number << PCIE_ECAM_BUS_SHIFT) |
+ (devfn << PCIE_ECAM_DEVFN_SHIFT);
+
+ return port->reg_base + relbus + where;
+}
+
+/* PCIe operations */
+static struct pci_ecam_ops xilinx_pcie_dma_ops = {
+ .pci_ops = {
+ .map_bus = xilinx_pcie_dma_map_bus,
+ .read = pci_generic_config_read,
+ .write = pci_generic_config_write,
+ }
+};
+
+/**
+ * xilinx_pcie_dma_enable_msi - Enable MSI support
+ * @port: PCIe port information
+ */
+static void xilinx_pcie_dma_enable_msi(struct xilinx_pcie_dma *port)
+{
+ phys_addr_t msi_addr = port->phys_reg_base;
+
+ pcie_write(port, upper_32_bits(msi_addr), XILINX_PCIE_DMA_REG_MSIBASE1);
+ pcie_write(port, lower_32_bits(msi_addr), XILINX_PCIE_DMA_REG_MSIBASE2);
+}
+
+static void xilinx_mask_leg_irq(struct irq_data *data)
+{
+ struct xilinx_pcie_dma *port = irq_data_get_irq_chip_data(data);
+ unsigned long flags;
+ u32 mask;
+ u32 val;
+
+ mask = BIT(data->hwirq + XILINX_PCIE_DMA_IDRN_SHIFT);
+ raw_spin_lock_irqsave(&port->lock, flags);
+ val = pcie_read(port, XILINX_PCIE_DMA_REG_IDRN_MASK);
+ pcie_write(port, (val & (~mask)), XILINX_PCIE_DMA_REG_IDRN_MASK);
+ raw_spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void xilinx_unmask_leg_irq(struct irq_data *data)
+{
+ struct xilinx_pcie_dma *port = irq_data_get_irq_chip_data(data);
+ unsigned long flags;
+ u32 mask;
+ u32 val;
+
+ mask = BIT(data->hwirq + XILINX_PCIE_DMA_IDRN_SHIFT);
+ raw_spin_lock_irqsave(&port->lock, flags);
+ val = pcie_read(port, XILINX_PCIE_DMA_REG_IDRN_MASK);
+ pcie_write(port, (val | mask), XILINX_PCIE_DMA_REG_IDRN_MASK);
+ raw_spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static struct irq_chip xilinx_leg_irq_chip = {
+ .name = "INTx",
+ .irq_mask = xilinx_mask_leg_irq,
+ .irq_unmask = xilinx_unmask_leg_irq,
+};
+
+/**
+ * xilinx_pcie_dma_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_dma_intx_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &xilinx_leg_irq_chip, handle_level_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_pcie_dma_intx_map,
+};
+
+static void xilinx_pcie_dma_handle_msi_irq(struct xilinx_pcie_dma *port,
+ u32 status_reg)
+{
+ struct xilinx_msi *msi;
+ unsigned long status;
+ u32 bit;
+ u32 virq;
+
+ msi = &port->msi;
+
+ while ((status = pcie_read(port, status_reg)) != 0) {
+ for_each_set_bit(bit, &status, 32) {
+ pcie_write(port, 1 << bit, status_reg);
+ if (status_reg == XILINX_PCIE_DMA_REG_MSI_HI)
+ bit = bit + 32;
+ virq = irq_find_mapping(msi->dev_domain, bit);
+ if (virq)
+ generic_handle_irq(virq);
+ }
+ }
+}
+
+static void xilinx_pcie_dma_msi_handler_high(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct xilinx_pcie_dma *port = irq_desc_get_handler_data(desc);
+
+ chained_irq_enter(chip, desc);
+ xilinx_pcie_dma_handle_msi_irq(port, XILINX_PCIE_DMA_REG_MSI_HI);
+ chained_irq_exit(chip, desc);
+}
+
+static void xilinx_pcie_dma_msi_handler_low(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct xilinx_pcie_dma *port = irq_desc_get_handler_data(desc);
+
+ chained_irq_enter(chip, desc);
+ xilinx_pcie_dma_handle_msi_irq(port, XILINX_PCIE_DMA_REG_MSI_LOW);
+ chained_irq_exit(chip, desc);
+}
+
+static void xilinx_pcie_dma_event_flow(struct irq_desc *desc)
+{
+ struct xilinx_pcie_dma *port = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ unsigned long val;
+ int i;
+
+ chained_irq_enter(chip, desc);
+ val = pcie_read(port, XILINX_PCIE_DMA_REG_IDR);
+ val &= pcie_read(port, XILINX_PCIE_DMA_REG_IMR);
+ for_each_set_bit(i, &val, 32)
+ generic_handle_domain_irq(port->pldma_domain, i);
+
+ pcie_write(port, val, XILINX_PCIE_DMA_REG_IDR);
+
+ chained_irq_exit(chip, desc);
+}
+
+#define _IC(x, s) \
+ [XILINX_PCIE_DMA_INTR_ ## x] = { __stringify(x), s }
+
+static const struct {
+ const char *sym;
+ const char *str;
+} intr_cause[32] = {
+ _IC(LINK_DOWN, "Link Down"),
+ _IC(HOT_RESET, "Hot reset"),
+ _IC(CFG_TIMEOUT, "ECAM access timeout"),
+ _IC(CORRECTABLE, "Correctable error message"),
+ _IC(NONFATAL, "Non fatal error message"),
+ _IC(FATAL, "Fatal error message"),
+ _IC(INTX, "INTX error message"),
+ _IC(MSI, "MSI message received"),
+ _IC(SLV_UNSUPP, "Slave unsupported request"),
+ _IC(SLV_UNEXP, "Slave unexpected completion"),
+ _IC(SLV_COMPL, "Slave completion timeout"),
+ _IC(SLV_ERRP, "Slave Error Poison"),
+ _IC(SLV_CMPABT, "Slave Completer Abort"),
+ _IC(SLV_ILLBUR, "Slave Illegal Burst"),
+ _IC(MST_DECERR, "Master decode error"),
+ _IC(MST_SLVERR, "Master slave error"),
+};
+
+static irqreturn_t xilinx_pcie_dma_intr_handler(int irq, void *dev_id)
+{
+ struct xilinx_pcie_dma *port = (struct xilinx_pcie_dma *)dev_id;
+ struct device *dev = port->dev;
+ struct irq_data *d;
+
+ d = irq_domain_get_irq_data(port->pldma_domain, irq);
+ switch (d->hwirq) {
+ case XILINX_PCIE_DMA_INTR_CORRECTABLE:
+ case XILINX_PCIE_DMA_INTR_NONFATAL:
+ case XILINX_PCIE_DMA_INTR_FATAL:
+ xilinx_pcie_dma_clear_err_interrupts(port);
+ fallthrough;
+
+ default:
+ if (intr_cause[d->hwirq].str)
+ dev_warn(dev, "%s\n", intr_cause[d->hwirq].str);
+ else
+ dev_warn(dev, "Unknown IRQ %ld\n", d->hwirq);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static struct irq_chip xilinx_msi_irq_chip = {
+ .name = "xilinx_pcie_dmapcie: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,
+};
+
+static struct msi_domain_info xilinx_msi_domain_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_MULTI_PCI_MSI),
+ .chip = &xilinx_msi_irq_chip,
+};
+
+static void xilinx_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct xilinx_pcie_dma *pcie = irq_data_get_irq_chip_data(data);
+ phys_addr_t msi_addr = pcie->phys_reg_base;
+
+ msg->address_lo = lower_32_bits(msi_addr);
+ msg->address_hi = upper_32_bits(msi_addr);
+ msg->data = data->hwirq;
+}
+
+static int xilinx_msi_set_affinity(struct irq_data *irq_data,
+ const struct cpumask *mask, bool force)
+{
+ return -EINVAL;
+}
+
+static struct irq_chip xilinx_irq_chip = {
+ .name = "Xilinx MSI",
+ .irq_compose_msi_msg = xilinx_compose_msi_msg,
+ .irq_set_affinity = xilinx_msi_set_affinity,
+};
+
+static int xilinx_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *args)
+{
+ struct xilinx_pcie_dma *pcie = domain->host_data;
+ struct xilinx_msi *msi = &pcie->msi;
+ int bit;
+ int i;
+
+ mutex_lock(&msi->lock);
+ bit = bitmap_find_free_region(msi->bitmap, XILINX_NUM_MSI_IRQS,
+ get_count_order(nr_irqs));
+ if (bit < 0) {
+ mutex_unlock(&msi->lock);
+ return -ENOSPC;
+ }
+
+ for (i = 0; i < nr_irqs; i++) {
+ irq_domain_set_info(domain, virq + i, bit + i, &xilinx_irq_chip,
+ domain->host_data, handle_simple_irq,
+ NULL, NULL);
+ }
+ mutex_unlock(&msi->lock);
+ return 0;
+}
+
+static void xilinx_irq_domain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs)
+{
+ struct irq_data *data = irq_domain_get_irq_data(domain, virq);
+ struct xilinx_pcie_dma *pcie = irq_data_get_irq_chip_data(data);
+ struct xilinx_msi *msi = &pcie->msi;
+
+ mutex_lock(&msi->lock);
+ bitmap_release_region(msi->bitmap, data->hwirq,
+ get_count_order(nr_irqs));
+ mutex_unlock(&msi->lock);
+}
+
+static const struct irq_domain_ops dev_msi_domain_ops = {
+ .alloc = xilinx_irq_domain_alloc,
+ .free = xilinx_irq_domain_free,
+};
+
+static void xilinx_pcie_dma_free_interrupts(struct xilinx_pcie_dma *port)
+{
+ irq_set_chained_handler_and_data(port->msi.irq_msi0, NULL, NULL);
+ irq_set_chained_handler_and_data(port->msi.irq_msi1, NULL, NULL);
+}
+
+static void xilinx_pcie_dma_free_irq_domains(struct xilinx_pcie_dma *port)
+{
+ struct xilinx_msi *msi = &port->msi;
+
+ if (port->leg_domain) {
+ irq_domain_remove(port->leg_domain);
+ port->leg_domain = NULL;
+ }
+
+ if (msi->dev_domain) {
+ irq_domain_remove(msi->dev_domain);
+ msi->dev_domain = NULL;
+ }
+
+ if (msi->msi_domain) {
+ irq_domain_remove(msi->msi_domain);
+ msi->msi_domain = NULL;
+ }
+}
+
+static int xilinx_pcie_dma_init_msi_irq_domain(struct xilinx_pcie_dma *port)
+{
+ struct fwnode_handle *fwnode = of_node_to_fwnode(port->dev->of_node);
+ struct xilinx_msi *msi = &port->msi;
+ int size = BITS_TO_LONGS(XILINX_NUM_MSI_IRQS) * sizeof(long);
+ struct device *dev = port->dev;
+
+ msi->dev_domain = irq_domain_add_linear(NULL, XILINX_NUM_MSI_IRQS,
+ &dev_msi_domain_ops, port);
+ if (!msi->dev_domain)
+ goto out;
+
+ msi->msi_domain = pci_msi_create_irq_domain(fwnode,
+ &xilinx_msi_domain_info,
+ msi->dev_domain);
+ if (!msi->msi_domain)
+ goto out;
+
+ mutex_init(&msi->lock);
+ msi->bitmap = kzalloc(size, GFP_KERNEL);
+ if (!msi->bitmap)
+ goto out;
+
+ raw_spin_lock_init(&port->lock);
+ xilinx_pcie_dma_enable_msi(port);
+
+ return 0;
+
+out:
+ xilinx_pcie_dma_free_irq_domains(port);
+ dev_err(dev, "Failed to allocate MSI IRQ domains\n");
+ return -ENOMEM;
+}
+
+static void xilinx_pcie_dma_intx_flow(struct irq_desc *desc)
+{
+ struct xilinx_pcie_dma *port = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ unsigned long val;
+ int i;
+
+ chained_irq_enter(chip, desc);
+
+ val = FIELD_GET(XILINX_PCIE_DMA_IDRN_MASK,
+ pcie_read(port, XILINX_PCIE_DMA_REG_IDRN));
+
+ for_each_set_bit(i, &val, PCI_NUM_INTX)
+ generic_handle_domain_irq(port->leg_domain, i);
+
+ chained_irq_exit(chip, desc);
+}
+
+static void xilinx_pcie_dma_mask_event_irq(struct irq_data *d)
+{
+ struct xilinx_pcie_dma *port = irq_data_get_irq_chip_data(d);
+ u32 val;
+
+ raw_spin_lock(&port->lock);
+ val = pcie_read(port, XILINX_PCIE_DMA_REG_IMR);
+ val &= ~BIT(d->hwirq);
+ pcie_write(port, val, XILINX_PCIE_DMA_REG_IMR);
+ raw_spin_unlock(&port->lock);
+}
+
+static void xilinx_pcie_dma_unmask_event_irq(struct irq_data *d)
+{
+ struct xilinx_pcie_dma *port = irq_data_get_irq_chip_data(d);
+ u32 val;
+
+ raw_spin_lock(&port->lock);
+ val = pcie_read(port, XILINX_PCIE_DMA_REG_IMR);
+ val |= BIT(d->hwirq);
+ pcie_write(port, val, XILINX_PCIE_DMA_REG_IMR);
+ raw_spin_unlock(&port->lock);
+}
+
+static struct irq_chip xilinx_pcie_dma_event_irq_chip = {
+ .name = "RC-Event",
+ .irq_mask = xilinx_pcie_dma_mask_event_irq,
+ .irq_unmask = xilinx_pcie_dma_unmask_event_irq,
+};
+
+static int xilinx_pcie_dma_event_map(struct irq_domain *domain,
+ unsigned int irq, irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &xilinx_pcie_dma_event_irq_chip,
+ handle_level_irq);
+ irq_set_chip_data(irq, domain->host_data);
+ irq_set_status_flags(irq, IRQ_LEVEL);
+ return 0;
+}
+
+static const struct irq_domain_ops event_domain_ops = {
+ .map = xilinx_pcie_dma_event_map,
+};
+
+/**
+ * xilinx_pcie_dma_init_irq_domain - Initialize IRQ domain
+ * @port: PCIe port information
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int xilinx_pcie_dma_init_irq_domain(struct xilinx_pcie_dma *port)
+{
+ struct device *dev = port->dev;
+ struct device_node *node = dev->of_node;
+ struct device_node *pcie_intc_node;
+ int ret;
+
+ /* 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->pldma_domain = irq_domain_add_linear(pcie_intc_node, 32,
+ &event_domain_ops, port);
+ if (!port->pldma_domain)
+ goto out;
+
+ irq_domain_update_bus_token(port->pldma_domain, DOMAIN_BUS_NEXUS);
+
+ 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 legacy IRQ domain\n");
+ return PTR_ERR(port->leg_domain);
+ }
+
+ irq_domain_update_bus_token(port->leg_domain, DOMAIN_BUS_WIRED);
+
+ ret = xilinx_pcie_dma_init_msi_irq_domain(port);
+ if (ret != 0) {
+ irq_domain_remove(port->leg_domain);
+ return -ENOMEM;
+ }
+
+ of_node_put(pcie_intc_node);
+ raw_spin_lock_init(&port->lock);
+
+ return 0;
+out:
+ return -ENOMEM;
+}
+
+static int xilinx_pcie_dma_setup_irq(struct xilinx_pcie_dma *port)
+{
+ struct device *dev = port->dev;
+ struct platform_device *pdev = to_platform_device(dev);
+ int i, irq;
+
+ port->irq = platform_get_irq(pdev, 0);
+ if (port->irq < 0)
+ return port->irq;
+
+ for (i = 0; i < ARRAY_SIZE(intr_cause); i++) {
+ int err;
+
+ if (!intr_cause[i].str)
+ continue;
+
+ irq = irq_create_mapping(port->pldma_domain, i);
+ if (!irq) {
+ dev_err(dev, "Failed to map interrupt\n");
+ return -ENXIO;
+ }
+
+ err = devm_request_irq(dev, irq, xilinx_pcie_dma_intr_handler,
+ 0, intr_cause[i].sym, port);
+ if (err) {
+ dev_err(dev, "Failed to request IRQ %d\n", irq);
+ return err;
+ }
+ }
+
+ port->intx_irq = irq_create_mapping(port->pldma_domain,
+ XILINX_PCIE_DMA_INTR_INTX);
+ if (!port->intx_irq) {
+ dev_err(dev, "Failed to map INTx interrupt\n");
+ return -ENXIO;
+ }
+
+ /* Plug the INTx chained handler */
+ irq_set_chained_handler_and_data(port->intx_irq,
+ xilinx_pcie_dma_intx_flow, port);
+
+ /* Plug the main event chained handler */
+ irq_set_chained_handler_and_data(port->irq,
+ xilinx_pcie_dma_event_flow, port);
+
+ return 0;
+}
+
+/**
+ * xilinx_pcie_dma_init_port - Initialize hardware
+ * @port: PCIe port information
+ */
+static void xilinx_pcie_dma_init_port(struct xilinx_pcie_dma *port)
+{
+ if (xilinx_pcie_dma_linkup(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_DMA_IDR_ALL_MASK,
+ XILINX_PCIE_DMA_REG_IMR);
+
+ /* Clear pending interrupts */
+ pcie_write(port, pcie_read(port, XILINX_PCIE_DMA_REG_IDR) &
+ XILINX_PCIE_DMA_IMR_ALL_MASK,
+ XILINX_PCIE_DMA_REG_IDR);
+
+ /* Needed for MSI DECODE MODE */
+ pcie_write(port, XILINX_PCIE_DMA_IDR_ALL_MASK, XILINX_PCIE_DMA_REG_MSI_LOW_MASK);
+ pcie_write(port, XILINX_PCIE_DMA_IDR_ALL_MASK, XILINX_PCIE_DMA_REG_MSI_HI_MASK);
+
+ /* Enable the Bridge enable bit */
+ pcie_write(port, pcie_read(port, XILINX_PCIE_DMA_REG_RPSC) |
+ XILINX_PCIE_DMA_REG_RPSC_BEN,
+ XILINX_PCIE_DMA_REG_RPSC);
+}
+
+static int xilinx_request_msi_irq(struct xilinx_pcie_dma *port)
+{
+ struct device *dev = port->dev;
+ struct platform_device *pdev = to_platform_device(dev);
+
+ port->msi.irq_msi0 = platform_get_irq_byname(pdev, "msi0");
+ if (port->msi.irq_msi0 <= 0) {
+ dev_err(dev, "Unable to find msi0 IRQ line\n");
+ return port->msi.irq_msi0;
+ }
+
+ irq_set_chained_handler_and_data(port->msi.irq_msi0,
+ xilinx_pcie_dma_msi_handler_low,
+ port);
+
+ port->msi.irq_msi1 = platform_get_irq_byname(pdev, "msi1");
+ if (port->msi.irq_msi1 <= 0) {
+ irq_set_chained_handler_and_data(port->msi.irq_msi0,
+ NULL, NULL);
+ dev_err(dev, "Unable to find msi1 IRQ line\n");
+ return port->msi.irq_msi1;
+ }
+
+ irq_set_chained_handler_and_data(port->msi.irq_msi1,
+ xilinx_pcie_dma_msi_handler_high,
+ port);
+
+ return 0;
+}
+
+/**
+ * xilinx_pcie_dma_parse_dt - Parse Device tree
+ * @port: PCIe port information
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int xilinx_pcie_dma_parse_dt(struct xilinx_pcie_dma *port,
+ struct resource *bus_range)
+{
+ struct device *dev = port->dev;
+ struct device_node *node = dev->of_node;
+ struct resource regs;
+ int err;
+
+ err = of_address_to_resource(node, 0, &regs);
+ if (err) {
+ dev_err(dev, "missing \"reg\" property\n");
+ return err;
+ }
+ port->phys_reg_base = regs.start;
+
+ port->cfg = pci_ecam_create(dev, &regs, bus_range, &xilinx_pcie_dma_ops);
+ if (IS_ERR(port->cfg))
+ return -1;
+
+ port->reg_base = port->cfg->win;
+
+ err = xilinx_request_msi_irq(port);
+ if (err) {
+ pci_ecam_free(port->cfg);
+ return err;
+ }
+
+ return 0;
+}
+
+/**
+ * xilinx_pcie_dma_probe - Probe function
+ * @pdev: Platform device pointer
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int xilinx_pcie_dma_probe(struct platform_device *pdev)
+{
+ struct xilinx_pcie_dma *port;
+ struct device *dev = &pdev->dev;
+ struct pci_host_bridge *bridge;
+ struct resource_entry *bus;
+ int err;
+
+ bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
+ if (!bridge)
+ return -ENODEV;
+
+ port = pci_host_bridge_priv(bridge);
+
+ port->dev = dev;
+
+ bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
+ if (!bus)
+ return -ENODEV;
+
+ err = xilinx_pcie_dma_parse_dt(port, bus->res);
+ if (err) {
+ dev_err(dev, "Parsing DT failed\n");
+ return err;
+ }
+
+ xilinx_pcie_dma_init_port(port);
+
+ err = xilinx_pcie_dma_init_irq_domain(port);
+ if (err)
+ goto err_irq_domain;
+
+ err = xilinx_pcie_dma_setup_irq(port);
+
+ bridge->sysdata = port;
+ bridge->ops = (struct pci_ops *)&xilinx_pcie_dma_ops.pci_ops;
+
+ err = pci_host_probe(bridge);
+ if (err < 0)
+ goto err_host_bridge;
+
+ return 0;
+
+err_host_bridge:
+ xilinx_pcie_dma_free_irq_domains(port);
+
+err_irq_domain:
+ pci_ecam_free(port->cfg);
+ xilinx_pcie_dma_free_interrupts(port);
+ return err;
+}
+
+static const struct of_device_id xilinx_pcie_dma_of_match[] = {
+ {
+ .compatible = "xlnx,xdma-host-3.00",
+ },
+ {}
+};
+
+static struct platform_driver xilinx_pcie_dma_driver = {
+ .driver = {
+ .name = "xilinx-xdma-pcie",
+ .of_match_table = xilinx_pcie_dma_of_match,
+ .suppress_bind_attrs = true,
+ },
+ .probe = xilinx_pcie_dma_probe,
+};
+
+builtin_platform_driver(xilinx_pcie_dma_driver);
--
2.25.1