This patch adds support for the Microchip PCIe PolarFire PCIe
controller when configured in host (Root Complex) mode.
Signed-off-by: Daire McNamara <daire.mcnamara@xxxxxxxxxxxxx>
---
.../bindings/pci/microchip-pcie.txt | 64 ++
drivers/pci/controller/Kconfig | 9 +
drivers/pci/controller/Makefile | 1 +
drivers/pci/controller/pcie-microchip-host.c | 702 ++++++++++++++++++
4 files changed, 776 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/microchip-pcie.txt
create mode 100644 drivers/pci/controller/pcie-microchip-host.c
diff --git a/Documentation/devicetree/bindings/pci/microchip-pcie.txt b/Documentation/devicetree/bindings/pci/microchip-pcie.txt
new file mode 100644
index 000000000000..9fa129cbce80
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/microchip-pcie.txt
@@ -0,0 +1,64 @@
+* Microchip AXI PCIe Root Port Bridge DT description
+
+Required properties:
+- #address-cells: Address representation for root ports, set to <3>
+- #size-cells: Size representation for root ports, set to <2>
+- #interrupt-cells: specifies the number of cells needed to encode an
+ interrupt source. The value must be 1.
+- compatible: Should contain "microchip,pf-axi-pcie-host"
+- reg: Should contain two address length tuples.
+ The first is for the internal PCI bridge registers
+ The second is for the PCI config space access registers
+- device_type: must be "pci"
+- interrupts: Should contain AXI PCIe interrupt
+- interrupt-map-mask,
+- interrupt-map: standard PCI properties to define the mapping of the
+ PCI interface to interrupt numbers.
+- ranges: ranges for the PCI memory regions (I/O space region is not
+ supported by hardware)
+ Please refer to the standard PCI bus binding document for a more
+ detailed explanation
+
+Optional properties for PolarFire:
+- bus-range: PCI bus numbers covered
+
+Interrupt controller child node
++++++++++++++++++++++++++++++++
+Required properties:
+- interrupt-controller: identifies the node as an interrupt controller
+- #address-cells: specifies the number of cells needed to encode an
+ address. The value must be 0.
+- #interrupt-cells: specifies the number of cells needed to encode an
+ interrupt source. The value must be 1.
+
+NOTE:
+The core provides a single interrupt for both INTx/MSI messages. So,
+create an interrupt controller node to support 'interrupt-map' DT
+functionality. The driver will create an IRQ domain for this map, decode
+the four INTx interrupts in ISR and route them to this domain.
+
+
+Example:
+++++++++
+AloeVera:
+
+ pcie: pcie@2030000000 {
+ #address-cells = <3>;
+ #size-cells = <2>;
+ #interrupt-cells = <1>;
+ compatible = "microchip,pf-axi-pcie-host-1.0";
+ device_type = "pci";
+ bus-range = <0x00 0x7f>;
+ interrupt-map = <0 0 0 1 &pcie 1>,
+ <0 0 0 2 &pcie 2>,
+ <0 0 0 3 &pcie 3>,
+ <0 0 0 4 &pcie 4>;
+ interrupt-map-mask = <0 0 0 7>;
+ interrupt-parent = <&L4>;
+ interrupts = <32>;
+ ranges = <0x3000000 0 0x40000000 0x0 0x40000000 0x0 0x20000000>;
+ reg = <0x20 0x30000000 0x0 0x4000000>, /* internal registers */
+ <0x20 0x0 0x0 0x100000>; /* config space access registers */
+ reg-names = "control", "apb";
+ interrupt-controller;
+ };
diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 91bfdb784829..5ec760466bd9 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -258,6 +258,15 @@ config PCI_HYPERV_INTERFACE
The Hyper-V PCI Interface is a helper driver allows other drivers to
have a common interface with the Hyper-V PCI frontend driver.
+config PCIE_MICROCHIP_HOST
+ bool "Microchip AXI PCIe host bridge support"
+ depends on PCI_MSI && OF
+ select PCI_MSI_IRQ_DOMAIN
+ select GENERIC_MSI_IRQ_DOMAIN
+ help
+ Say Y here if you want kernel to support the Microchip AXI PCIe
+ Host Bridge driver.
+
source "drivers/pci/controller/dwc/Kconfig"
source "drivers/pci/controller/mobiveil/Kconfig"
source "drivers/pci/controller/cadence/Kconfig"
diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile
index 158c59771824..416528d8553e 100644
--- a/drivers/pci/controller/Makefile
+++ b/drivers/pci/controller/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_PCIE_ROCKCHIP_EP) += pcie-rockchip-ep.o
obj-$(CONFIG_PCIE_ROCKCHIP_HOST) += pcie-rockchip-host.o
obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o
obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o
+obj-$(CONFIG_PCIE_MICROCHIP_HOST) += pcie-microchip-host.o
obj-$(CONFIG_VMD) += vmd.o
obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o
# pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW
diff --git a/drivers/pci/controller/pcie-microchip-host.c b/drivers/pci/controller/pcie-microchip-host.c
new file mode 100644
index 000000000000..79b1f56cc9b6
--- /dev/null
+++ b/drivers/pci/controller/pcie-microchip-host.c
@@ -0,0 +1,702 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Microchip AXI PCIe Bridge host controller driver
+ *
+ * Copyright (c) 2018 - 2019 Microchip Corporation. All rights reserved.
+ *
+ * Author: Daire McNamara <daire.mcnamara@xxxxxxxxxxxxx>
+ *
+ * Based on:
+ * pcie-rcar.c
+ * pcie-xilinx.c
+ * pcie-altera.c
+ */
+#include <linux/irqchip/chained_irq.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/pci-ecam.h>
+#include <linux/platform_device.h>
+
+#include "../pci.h"
+
+/* Number of MSI IRQs */
+#define MC_NUM_MSI_IRQS 32
+#define MC_NUM_MSI_IRQS_CODED 5
+
+#define MC_MSI_OFFSET 0x190
+
+/* PCIe Bridge Phy and Controller Phy offsets */
+#define MC_PCIE1_BRIDGE_ADDR 0x00008000u
+#define MC_PCIE1_CTRL_ADDR 0x0000a000u
+
+/* PCIe Controller Phy Regs */
+#define MC_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 MC_SEC_ERROR_INT_MASK 0x2c
+#define MC_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 MC_DED_ERROR_INT_MASK 0x34
+#define MC_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 MC_LTSSM_STATE 0x5c
+#define LTSSM_L0_STATE 0x10
+#define MC_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 MC_PCIE_PCI_IDS_DW1 0x9c
+
+/* PCIe Config space MSI capability structure */
+#define MC_MSI_CAP_CTRL 0xe0u
+#define MSI_ENABLE (0x01u << 16)
+#define MSI_CAP_MULTI (MC_NUM_MSI_IRQS_CODED << 17)
+#define MSI_ENABLE_MULTI (MC_NUM_MSI_IRQS_CODED << 20)
+#define MC_MSI_MSG_LO_ADDR 0xe4u
+#define MC_MSI_MSG_HI_ADDR 0xe8u
+#define MC_MSI_MSG_DATA 0xf0u
+
+#define MC_IMASK_LOCAL 0x180
+#define PCIE_LOCAL_INT_ENABLE 0x0f000000u
+#define PCI_INTS 0x0f000000u
+#define PM_MSI_INT_SHIFT 24
+#define PCIE_ENABLE_MSI 0x10000000u
+#define MSI_INT 0x10000000u
+#define MSI_INT_SHIFT 28
+#define MC_ISTATUS_LOCAL 0x184
+#define MC_IMASK_HOST 0x188
+#define MC_ISTATUS_HOST 0x18c
+#define MC_ISTATUS_MSI 0x194
+
+/* PCIe Master table init defines */
+#define MC_ATR0_PCIE_WIN0_SRCADDR_31_12 0x600u
+#define ATR0_PCIE_WIN0_SIZE 0x1f
+#define ATR0_PCIE_WIN0_SIZE_SHIFT 1
+#define MC_ATR0_PCIE_WIN0_SRCADDR_63_32 0x604u
+
+/* PCIe AXI slave table init defines */
+#define MC_ATR0_AXI4_SLV0_SRCADDR_PARAM 0x800u
+#define ATR_SIZE_SHIFT 1
+#define ATR_IMPL_ENABLE 1
+#define MC_ATR0_AXI4_SLV0_SRC_ADDR 0x804u
+#define MC_ATR0_AXI4_SLV0_TRSL_ADDR_LSB 0x808u
+#define MC_ATR0_AXI4_SLV0_TRSL_ADDR_UDW 0x80cu
+#define MC_ATR0_AXI4_SLV0_TRSL_PARAM 0x810u
+#define PCIE_TX_RX_INTERFACE 0x00000000u
+#define PCIE_CONFIG_INTERFACE 0x00000001u
+#define ATR0_AXI4_SLV_SIZE 32
+
+struct mc_msi {
+ struct mutex lock; /* Protect used bitmap */
+ struct irq_domain *msi_domain;
+ struct irq_domain *dev_domain;
+ u32 num_vectors;
+ phys_addr_t vector_phy;
+ DECLARE_BITMAP(used, MC_NUM_MSI_IRQS);
+};
+
+struct mc_pcie {
+ struct platform_device *pdev;
+ void __iomem *cfg_base_addr;
+ void __iomem *bridge_base_addr;
+ void __iomem *ctrl_base_addr;
+ u64 hw_base_addr;
+ u32 atr_sz;
+ u32 irq;
+ struct irq_domain *intx_domain;
+ raw_spinlock_t intx_mask_lock;
+ struct mc_msi msi;
+};
+
+static inline u32 cfg_readl(struct mc_pcie *pcie, const u32 reg)
+{
+ return readl_relaxed(pcie->cfg_base_addr + reg);
+}
+
+static inline void cfg_writel(struct mc_pcie *pcie, const u32 val,
+ const u32 reg)
+{
+ writel_relaxed(val, pcie->cfg_base_addr + reg);
+}
+
+static void mc_pcie_enable(struct mc_pcie *pcie)
+{
+ u32 enb;
+
+ enb = readl(pcie->bridge_base_addr + MC_LTSSM_STATE);
+ enb |= LTSSM_L0_STATE;
+ writel(enb, pcie->bridge_base_addr + MC_LTSSM_STATE);
+}
+
+static void mc_pcie_isr(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct mc_pcie *pcie = irq_desc_get_handler_data(desc);
+ struct device *dev = &pcie->pdev->dev;
+ struct mc_msi *msi = &pcie->msi;
+ unsigned long status;
+ unsigned long intx_status;
+ unsigned long msi_status;
+ u32 bit;
+ u32 virq;
+
+ /*
+ * The core provides a single interrupt for both INTx/MSI messages.
+ * So we'll read both INTx and MSI status.
+ */
+ chained_irq_enter(chip, desc);
+
+ status = readl(pcie->bridge_base_addr + MC_ISTATUS_LOCAL);
+ while (status & (PCI_INTS | MSI_INT)) {
+ intx_status = (status & PCI_INTS) >> PM_MSI_INT_SHIFT;
+ for_each_set_bit(bit, &intx_status, PCI_NUM_INTX) {
+ virq = irq_find_mapping(pcie->intx_domain, bit + 1);
+ if (virq)
+ generic_handle_irq(virq);
+ else
+ dev_err_ratelimited(dev, "bad INTx IRQ %d\n",
+ bit);
+
+ /* Clear that interrupt bit */
+ writel(1 << (bit + PM_MSI_INT_SHIFT),
+ pcie->bridge_base_addr + MC_ISTATUS_LOCAL);
+ }
+
+ msi_status = (status & MSI_INT);
+ if (msi_status) {
+ msi_status = readl(pcie->bridge_base_addr +
+ MC_ISTATUS_MSI);
+ for_each_set_bit(bit, &msi_status, msi->num_vectors) {
+ virq = irq_find_mapping(msi->dev_domain, bit);
+ if (virq)
+ generic_handle_irq(virq);
+ else
+ dev_err_ratelimited(dev,
+ "bad MSI IRQ %d\n",
+ bit);
+
+ /* Clear that MSI interrupt bit */
+ writel((1 << bit), pcie->bridge_base_addr +
+ MC_ISTATUS_MSI);
+ }
+ /* Clear the ISTATUS MSI bit */
+ writel(1 << MSI_INT_SHIFT, pcie->bridge_base_addr +
+ MC_ISTATUS_LOCAL);
+ }
+
+ status = readl(pcie->bridge_base_addr + MC_ISTATUS_LOCAL);
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static int mc_pcie_parse_dt(struct mc_pcie *pcie)
+{
+ struct platform_device *pdev = pcie->pdev;
+ struct device *dev = &pcie->pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct mc_msi *msi = &pcie->msi;
+ struct resource res;
+ const char *type;
+ resource_size_t size;
+ int ret;
+ void __iomem *axi_base_addr;
+ u64 cfg_addr;
+
+ type = of_get_property(node, "device_type", NULL);
+ if (!type || strcmp(type, "pci")) {
+ dev_err(dev, "invalid \"device_type\" %s\n", type);
+ return -EINVAL;
+ }
+
+ cfg_addr = of_translate_address(node,
+ of_get_address(node, 0, &size, 0));
+ if (cfg_addr == OF_BAD_ADDR) {
+ dev_err(dev, "missing \"cfg reg\" property\n");
+ return -ENODEV;
+ }
+
+ pcie->cfg_base_addr = devm_ioremap(dev, cfg_addr, size);
+ pcie->hw_base_addr = cfg_addr;
+
+ pcie->atr_sz = find_first_bit((const unsigned long *)&size, 64) - 1;
+
+ ret = of_address_to_resource(node, 1, &res);
+ if (ret) {
+ dev_err(dev, "missing \"reg\" property\n");
+ return ret;
+ }
+
+ axi_base_addr = devm_ioremap_resource(dev, &res);
+ if (IS_ERR(axi_base_addr))
+ return PTR_ERR(axi_base_addr);
+
+ pcie->bridge_base_addr = axi_base_addr + MC_PCIE1_BRIDGE_ADDR;
+ pcie->ctrl_base_addr = axi_base_addr + MC_PCIE1_CTRL_ADDR;
+
+ if (of_property_read_u64(node, "vector-slave", &msi->vector_phy))
+ msi->vector_phy = MC_MSI_OFFSET;
+
+ if (of_property_read_u32(node, "num-vectors", &msi->num_vectors))
+ msi->num_vectors = MC_NUM_MSI_IRQS;
+
+ pcie->irq = platform_get_irq(pdev, 0);
+ if (pcie->irq < 0) {
+ dev_err(dev, "unable to request IRQ%d\n", pcie->irq);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void mc_pcie_enable_msi(struct mc_pcie *pcie)
+{
+ struct mc_msi *msi = &pcie->msi;
+ u32 msg_ctrl = cfg_readl(pcie, MC_MSI_CAP_CTRL);
+
+ msg_ctrl |= MSI_ENABLE_MULTI | MSI_CAP_MULTI | MSI_ENABLE;
+ cfg_writel(pcie, msg_ctrl, MC_MSI_CAP_CTRL);
+ cfg_writel(pcie, lower_32_bits(msi->vector_phy), MC_MSI_MSG_LO_ADDR);
+ cfg_writel(pcie, upper_32_bits(msi->vector_phy), MC_MSI_MSG_HI_ADDR);
+}
+
+static int mc_host_init(struct mc_pcie *pcie)
+{
+ u32 val;
+
+ mc_pcie_enable(pcie);
+
+ 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, pcie->ctrl_base_addr + MC_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, pcie->ctrl_base_addr + MC_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, pcie->ctrl_base_addr + MC_SEC_ERROR_INT);
+ writel(val, pcie->ctrl_base_addr + MC_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, pcie->ctrl_base_addr + MC_DED_ERROR_INT);
+ writel(val, pcie->ctrl_base_addr + MC_DED_ERROR_INT_MASK);
+
+ writel(0, pcie->bridge_base_addr + MC_IMASK_LOCAL);
+ writel(GENMASK(31, 0), pcie->bridge_base_addr + MC_ISTATUS_LOCAL);
+ writel(0, pcie->bridge_base_addr + MC_IMASK_HOST);
+ writel(GENMASK(31, 0), pcie->bridge_base_addr + MC_ISTATUS_HOST);
+
+ /* Configure Address Translation Table 0 for PCIe config space */
+ writel(PCIE_CONFIG_INTERFACE, pcie->bridge_base_addr +
+ MC_ATR0_AXI4_SLV0_TRSL_PARAM);
+
+ val = lower_32_bits(pcie->hw_base_addr) |
+ (pcie->atr_sz << ATR_SIZE_SHIFT) | ATR_IMPL_ENABLE;
+ writel(val, pcie->bridge_base_addr + MC_ATR0_AXI4_SLV0_SRCADDR_PARAM);
+
+ val = lower_32_bits(pcie->hw_base_addr);
+ writel(val, pcie->bridge_base_addr + MC_ATR0_AXI4_SLV0_TRSL_ADDR_LSB);
+
+ val = readl(pcie->bridge_base_addr + MC_ATR0_PCIE_WIN0_SRCADDR_31_12);
+ val |= (ATR0_PCIE_WIN0_SIZE << ATR0_PCIE_WIN0_SIZE_SHIFT);
+
+ writel(val, pcie->bridge_base_addr + MC_ATR0_PCIE_WIN0_SRCADDR_31_12);
+
+ writel(0, pcie->bridge_base_addr + MC_ATR0_PCIE_WIN0_SRCADDR_63_32);
+
+ val = readl(pcie->bridge_base_addr + MC_PCIE_PCI_IDS_DW1);
+ val &= 0xffff;
+ val |= (PCI_CLASS_BRIDGE_PCI << 16);
+ writel(val, pcie->bridge_base_addr + MC_PCIE_PCI_IDS_DW1);
+
+ /* Setup bus numbers */
+ val = cfg_readl(pcie, PCI_PRIMARY_BUS);
+ val &= 0xff000000;
+ val |= 0x00ff0100;
+ cfg_writel(pcie, val, PCI_PRIMARY_BUS);
+
+ mc_pcie_enable_msi(pcie);
+
+ val = PCIE_ENABLE_MSI | PCIE_LOCAL_INT_ENABLE;
+ writel(val, pcie->bridge_base_addr + MC_IMASK_LOCAL);
+
+ return 0;
+}
+
+static void mc_mask_intx_irq(struct irq_data *data)
+{
+ struct irq_desc *desc = irq_to_desc(data->irq);
+ struct mc_pcie *pcie;
+ unsigned long flags;
+ u32 mask, val;
+
+ pcie = irq_desc_get_chip_data(desc);
+ mask = PCIE_LOCAL_INT_ENABLE;
+ raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
+ val = readl(pcie->bridge_base_addr + MC_IMASK_LOCAL);
+ val &= ~mask;
+ writel(val, pcie->bridge_base_addr + MC_IMASK_LOCAL);
+ raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
+}
+
+static void mc_unmask_intx_irq(struct irq_data *data)
+{
+ struct irq_desc *desc = irq_to_desc(data->irq);
+ struct mc_pcie *pcie;
+ unsigned long flags;
+ u32 mask, val;
+
+ pcie = irq_desc_get_chip_data(desc);
+ mask = PCIE_LOCAL_INT_ENABLE;
+ raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
+ val = readl(pcie->bridge_base_addr + MC_IMASK_LOCAL);
+ val |= mask;
+ writel(val, pcie->bridge_base_addr + MC_IMASK_LOCAL);
+ raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
+}
+
+static struct irq_chip mc_intx_irq_chip = {
+ .name = "microchip_pcie:intx",
+ .irq_enable = mc_unmask_intx_irq,
+ .irq_disable = mc_mask_intx_irq,
+ .irq_mask = mc_mask_intx_irq,
+ .irq_unmask = mc_unmask_intx_irq,
+};
+
+static int mc_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &mc_intx_irq_chip, handle_simple_irq);
+ irq_set_chip_data(irq, domain->host_data);
+
+ return 0;
+}
+
+static const struct irq_domain_ops intx_domain_ops = {
+ .map = mc_pcie_intx_map,
+};
+
+static struct irq_chip mc_msi_irq_chip = {
+ .name = "Microchip PCIe MSI",
+ .irq_mask = pci_msi_mask_irq,
+ .irq_unmask = pci_msi_unmask_irq,
+};
+
+static struct msi_domain_info mc_msi_domain_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_PCI_MSIX),
+ .chip = &mc_msi_irq_chip,
+};
+
+static void mc_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct mc_pcie *pcie = irq_data_get_irq_chip_data(data);
+ phys_addr_t addr = pcie->msi.vector_phy;
+
+ msg->address_lo = lower_32_bits(addr);
+ msg->address_hi = upper_32_bits(addr);
+ msg->data = data->hwirq;
+
+ dev_dbg(&pcie->pdev->dev, "msi#%x address_hi %#x address_lo %#x\n",
+ (int)data->hwirq, msg->address_hi, msg->address_lo);
+}
+
+static int mc_msi_set_affinity(struct irq_data *irq_data,
+ const struct cpumask *mask, bool force)
+{
+ return -EINVAL;
+}
+
+static struct irq_chip mc_msi_bottom_irq_chip = {
+ .name = "Microchip MSI",
+ .irq_compose_msi_msg = mc_compose_msi_msg,
+ .irq_set_affinity = mc_msi_set_affinity,
+};
+
+static int mc_irq_msi_domain_alloc(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs,
+ void *args)
+{
+ struct mc_pcie *pcie = domain->host_data;
+ struct mc_msi *msi = &pcie->msi;
+ unsigned long bit;
+ u32 reg;
+
+ WARN_ON(nr_irqs != 1);
+ mutex_lock(&msi->lock);
+ bit = find_first_zero_bit(msi->used, msi->num_vectors);
+ if (bit >= msi->num_vectors) {
+ mutex_unlock(&msi->lock);
+ return -ENOSPC;
+ }
+
+ set_bit(bit, msi->used);
+ mutex_unlock(&msi->lock);
+
+ irq_domain_set_info(domain, virq, bit, &mc_msi_bottom_irq_chip,
+ domain->host_data, handle_simple_irq, NULL, NULL);
+
+ /* Enable MSI interrupts */
+ reg = readl(pcie->bridge_base_addr + MC_IMASK_LOCAL);
+ reg |= PCIE_ENABLE_MSI;
+ writel(reg, pcie->bridge_base_addr + MC_IMASK_LOCAL);
+
+ return 0;
+}
+
+static void mc_irq_msi_domain_free(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs)
+{
+ struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+ struct mc_pcie *pcie = irq_data_get_irq_chip_data(d);
+ struct mc_msi *msi = &pcie->msi;
+
+ mutex_lock(&msi->lock);
+
+ if (test_bit(d->hwirq, msi->used))
+ __clear_bit(d->hwirq, msi->used);
+ else
+ dev_err(&pcie->pdev->dev, "trying to free unused MSI%lu\n",
+ d->hwirq);
+
+ mutex_unlock(&msi->lock);
+}
+
+static const struct irq_domain_ops msi_domain_ops = {
+ .alloc = mc_irq_msi_domain_alloc,
+ .free = mc_irq_msi_domain_free,
+};
+
+static int mc_allocate_msi_domains(struct mc_pcie *pcie)
+{
+ struct device *dev = &pcie->pdev->dev;
+ struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
+ struct mc_msi *msi = &pcie->msi;
+
+ mutex_init(&pcie->msi.lock);
+
+ msi->dev_domain = irq_domain_add_linear(NULL, msi->num_vectors,
+ &msi_domain_ops, pcie);
+ if (!msi->dev_domain) {
+ dev_err(dev, "failed to create IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ msi->msi_domain = pci_msi_create_irq_domain(fwnode,
+ &mc_msi_domain_info,
+ msi->dev_domain);
+ if (!msi->msi_domain) {
+ dev_err(dev, "failed to create MSI domain\n");
+ irq_domain_remove(msi->dev_domain);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int mc_pcie_init_irq_domains(struct mc_pcie *pcie)
+{
+ struct device *dev = &pcie->pdev->dev;
+ struct device_node *node = dev->of_node;
+
+ pcie->intx_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
+ &intx_domain_ops, pcie);
+ if (!pcie->intx_domain) {
+ dev_err(dev, "failed to get an INTx IRQ domain\n");
+ return -ENOMEM;
+ }
+ raw_spin_lock_init(&pcie->intx_mask_lock);
+
+ return mc_allocate_msi_domains(pcie);
+}
+
+static void mc_pci_unmap_cfg(void *ptr)
+{
+ pci_ecam_free((struct pci_config_window *)ptr);
+}
+
+static int mc_pcie_probe(struct platform_device *pdev)
+{
+ struct mc_pcie *pcie;
+ struct pci_bus *bus;
+ struct pci_bus *child;
+ struct pci_host_bridge *bridge;
+ struct pci_config_window *cfg;
+ struct device *dev = &pdev->dev;
+ struct resource_entry *win;
+ struct resource *bus_range = NULL;
+ struct resource cfgres;
+ int ret;
+ resource_size_t size;
+ u32 index;
+ u32 atr_sz;
+ u32 val;
+
+ if (!dev->of_node)
+ return -ENODEV;
+
+ /* Allocate the PCIe port */
+ bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
+ if (!bridge)
+ return -ENOMEM;
+
+ pcie = pci_host_bridge_priv(bridge);
+
+ pcie->pdev = pdev;
+
+ ret = mc_pcie_parse_dt(pcie);
+ if (ret) {
+ dev_err(dev, "parsing devicetree failed, ret %x\n", ret);
+ return ret;
+ }
+
+ irq_set_chained_handler_and_data(pcie->irq, mc_pcie_isr, pcie);
+
+ /*
+ * Configure all inbound and outbound windows and prepare
+ * for config access
+ */
+ ret = mc_host_init(pcie);
+ if (ret) {
+ dev_err(dev, "failed to initialize host\n");
+ return ret;
+ }
+
+ ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
+ &bridge->dma_ranges, &bus_range);
+ if (ret) {
+ dev_err(dev, "failed to parse PCI ranges\n");
+ return ret;
+ }
+
+ index = 1;
+ resource_list_for_each_entry(win, &bridge->windows) {
+ if ((resource_type(win->res) != IORESOURCE_MEM) &&
+ (resource_type(win->res) != IORESOURCE_IO))
+ continue;
+
+ size = resource_size(win->res);
+ atr_sz = find_first_bit((const unsigned long *)&size, 64) - 1;
+
+ /*
+ * Configure Address Translation Table index for PCI
+ * mem space
+ */
+ writel(PCIE_TX_RX_INTERFACE, pcie->bridge_base_addr +
+ (index * ATR0_AXI4_SLV_SIZE) +
+ MC_ATR0_AXI4_SLV0_TRSL_PARAM);
+
+ val = lower_32_bits(win->res->start) |
+ (atr_sz << ATR_SIZE_SHIFT) |
+ ATR_IMPL_ENABLE;
+
+ writel(val, pcie->bridge_base_addr +
+ (index * ATR0_AXI4_SLV_SIZE) +
+ MC_ATR0_AXI4_SLV0_SRCADDR_PARAM);
+
+ val = lower_32_bits(win->res->start - win->offset);
+ writel(val, pcie->bridge_base_addr +
+ (index * ATR0_AXI4_SLV_SIZE) +
+ MC_ATR0_AXI4_SLV0_TRSL_ADDR_LSB);
+
+ index++;
+ }
+
+ ret = mc_pcie_init_irq_domains(pcie);
+ if (ret) {
+ dev_err(dev, "failed creating IRQ domains\n");
+ return ret;
+ }
+
+ devm_iounmap(dev, pcie->cfg_base_addr);
+
+ ret = of_address_to_resource(dev->of_node, 0, &cfgres);
+ if (ret) {
+ dev_err(dev, "missing \"reg\" property\n");
+ return ret;
+ }
+
+ size = resource_size(&cfgres);
+
+ /* Parse and map our Configuration Space windows */
+ cfg = pci_ecam_create(dev, &cfgres, bus_range, &pci_generic_ecam_ops);
+ if (IS_ERR(cfg)) {
+ dev_err(dev, "failed creating Configuration Space\n");
+ return PTR_ERR(cfg);
+ }
+
+ ret = devm_add_action_or_reset(dev, mc_pci_unmap_cfg, cfg);
+ if (ret)
+ return ret;
+
+ /* Initialize bridge */
+ bridge->dev.parent = dev;
+ bridge->sysdata = cfg;
+ bridge->busnr = cfg->busr.start;
+ bridge->ops = &pci_generic_ecam_ops.pci_ops;
+ bridge->map_irq = of_irq_parse_and_map_pci;
+ bridge->swizzle_irq = pci_common_swizzle;
+
+ /* Setup the kernel resources for the newly added PCIe root bus */
+ ret = pci_scan_root_bus_bridge(bridge);
+ if (ret < 0)
+ return ret;
+
+ 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 mc_pcie_of_match[] = {
+ { .compatible = "microchip,pf-axi-pcie-host-1.0",
+ .data = &pci_generic_ecam_ops },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, mc_pcie_of_match)
+
+static struct platform_driver mc_pcie_driver = {
+ .probe = mc_pcie_probe,
+ .driver = {
+ .name = "microchip-pcie",
+ .of_match_table = mc_pcie_of_match,
+ .suppress_bind_attrs = true,
+ },
+};
+
+builtin_platform_driver(mc_pcie_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Microchip PCIe host controller driver");
+MODULE_AUTHOR("Daire McNamara <daire.mcnamara@xxxxxxxxxxxxx>");
--
2.17.1
