[PATCH v20 0/4] PCI: microchip: Add host driver for Microchip PCIe controller

[PATCH v20 0/4] PCI: microchip: Add host driver for Microchip PCIe controller

[daire.mcnamara]

From: Daire McNamara <daire.mcnamara@microchip.com>

This patchset adds support for the Microchip PCIe PolarFire PCIe
controller when configured in host (Root Complex) mode.

Updates since v19:
* Fixed typos and compiler warning

Updates since v18:
* Upgraded interrupt handling as per Lorenzo Pieralisi's suggestions.
  Gathered disparate registers onto an event register, created a new event domain,
  and split out end-of-interrupt functionality.

Updates since v17:
* Regenerated to apply to v5.10rc1
* Added self as maintainer
* Added clock enables and extra interrupt handling

Updates since v16:
* Patch needs CONFIG_PCI_HOST_COMMON.  Add this to Kconfig stanza

Updates since v15:
* Call platform_set_drvdata earlier in devm_pci_alloc_host_bridge()
* Use host_common_probe() and an init function to set up hw windows
* status is u32 in mc_pcie_isr()
* Removed mask var in mc_mask_intx_irq(), mc_unmask_intx_irq()
* irq var is now signed in mc_platform_init()

Updates since v14:
* Removed cfg_read/cfg_write inline functions
* Updated to irq_data_get_irq_chip_data()
* Updated to use devm_platform_ioremap_resource()
* Replaced of_pci_range parsing to setup windows via bridge pointer.

Updates since v13:
* Refactored to use pci_host_common_probe()

Updates since v12:
* Capitalised commit messages.  Use specific subject line for dt-bindings

Updates since v11:
* Adjusted so yaml file passses make dt_binding_check

Updates since v10:
* Adjusted driver as per Rob Herring's comments, notably:
  - use common PCI_MSI_FLAGS defines
  - reduce storage of unnecessary vars in mc_pcie struct
  - switched to read/write relaxed variants
  - extended lock in msi_domain_alloc routine
  - improved 32bit safety, switched from find_first_bit() to ilog2()
  - removed unnecessary twiddle of eCAM config space

Updates since v9:
* Adjusted commit logs
* make dt_bindings_check passes

Updates since v8:
* Refactored as per Rob Herring's comments:
  - bindings in schema format
  - Adjusted licence to GPLv2.0
  - Refactored access to config space between driver and common eCAM code
  - Adopted pci_host_probe()
  - Miscellanous other improvements

Updates since v7:
* Build for 64bit RISCV architecture only

Updates since v6:
* Refactored to use common eCAM driver
* Updated to CONFIG_PCIE_MICROCHIP_HOST etc
* Formatting improvements
* Removed code for selection between bridge 0 and 1

Updates since v5:
* Fixed Kconfig typo noted by Randy Dunlap
* Updated with comments from Bjorn Helgaas

Updates since v4:
* Fix compile issues.

Updates since v3:
* Update all references to Microsemi to Microchip
* Separate MSI functionality from legacy PCIe interrupt handling functionality

Updates since v2:
* Split out DT bindings and Vendor ID updates into their own patch
  from PCIe driver.
* Updated Change Log

Updates since v1:
* Incorporate feedback from Bjorn Helgaas

Daire McNamara (4):
  PCI: Call platform_set_drvdata earlier in devm_pci_alloc_host_bridge
  dt-bindings: PCI: microchip: Add Microchip PolarFire host binding
  PCI: microchip: Add host driver for Microchip PCIe controller
  MAINTAINERS: Add Daire McNamara as maintainer for the Microchip PCIe
    driver

 .../bindings/pci/microchip,pcie-host.yaml     |   92 ++
 MAINTAINERS                                   |    7 +
 drivers/pci/controller/Kconfig                |   10 +
 drivers/pci/controller/Makefile               |    1 +
 drivers/pci/controller/pci-host-common.c      |    4 +-
 drivers/pci/controller/pcie-microchip-host.c  | 1119 +++++++++++++++++
 6 files changed, 1231 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
 create mode 100644 drivers/pci/controller/pcie-microchip-host.c


base-commit: 3650b228f83adda7e5ee532e2b90429c03f7b9ec
-- 
2.25.1

[PATCH v20 1/4] PCI: Call platform_set_drvdata earlier in devm_pci_alloc_host_bridge

[daire.mcnamara]

From: Daire McNamara <daire.mcnamara@microchip.com>

Many drivers can now use pci_host_common_probe() directly.
Their hardware window setup can be moved from their 'custom' probe
functions to individual driver init functions.

Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/pci-host-common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
index 6ce34a1deecb..6ab694f8d283 100644
--- a/drivers/pci/controller/pci-host-common.c
+++ b/drivers/pci/controller/pci-host-common.c
@@ -64,6 +64,8 @@ int pci_host_common_probe(struct platform_device *pdev)
 	if (!bridge)
 		return -ENOMEM;
 
+	platform_set_drvdata(pdev, bridge);
+
 	of_pci_check_probe_only();
 
 	/* Parse and map our Configuration Space windows */
@@ -78,8 +80,6 @@ int pci_host_common_probe(struct platform_device *pdev)
 	bridge->sysdata = cfg;
 	bridge->ops = (struct pci_ops *)&ops->pci_ops;
 
-	platform_set_drvdata(pdev, bridge);
-
 	return pci_host_probe(bridge);
 }
 EXPORT_SYMBOL_GPL(pci_host_common_probe);
-- 
2.25.1

[PATCH v20 2/4] dt-bindings: PCI: microchip: Add Microchip PolarFire host binding

[daire.mcnamara]

From: Daire McNamara <daire.mcnamara@microchip.com>

Add device tree bindings for the Microchip PolarFire PCIe controller
when configured in host (Root Complex) mode.

Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../bindings/pci/microchip,pcie-host.yaml     | 92 +++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml

diff --git a/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
new file mode 100644
index 000000000000..04251d71f56b
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/microchip,pcie-host.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PCIe Root Port Bridge Controller Device Tree Bindings
+
+maintainers:
+  - Daire McNamara <daire.mcnamara@microchip.com>
+
+allOf:
+  - $ref: /schemas/pci/pci-bus.yaml#
+
+properties:
+  compatible:
+    const: microchip,pcie-host-1.0 # PolarFire
+
+  reg:
+    maxItems: 2
+
+  reg-names:
+    items:
+      - const: cfg
+      - const: apb
+
+  interrupts:
+    minItems: 1
+    maxItems: 2
+    items:
+      - description: PCIe host controller
+      - description: builtin MSI controller
+
+  interrupt-names:
+    minItems: 1
+    maxItems: 2
+    items:
+      - const: pcie
+      - const: msi
+
+  ranges:
+    maxItems: 1
+
+  msi-controller:
+    description: Identifies the node as an MSI controller.
+
+  msi-parent:
+    description: MSI controller the device is capable of using.
+
+required:
+  - reg
+  - reg-names
+  - "#interrupt-cells"
+  - interrupts
+  - interrupt-map-mask
+  - interrupt-map
+  - msi-controller
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    soc {
+            #address-cells = <2>;
+            #size-cells = <2>;
+            pcie0: pcie@2030000000 {
+                    compatible = "microchip,pcie-host-1.0";
+                    reg = <0x0 0x70000000 0x0 0x08000000>,
+                          <0x0 0x43000000 0x0 0x00010000>;
+                    reg-names = "cfg", "apb";
+                    device_type = "pci";
+                    #address-cells = <3>;
+                    #size-cells = <2>;
+                    #interrupt-cells = <1>;
+                    interrupts = <119>;
+                    interrupt-map-mask = <0x0 0x0 0x0 0x7>;
+                    interrupt-map = <0 0 0 1 &pcie_intc0 0>,
+                                    <0 0 0 2 &pcie_intc0 1>,
+                                    <0 0 0 3 &pcie_intc0 2>,
+                                    <0 0 0 4 &pcie_intc0 3>;
+                    interrupt-parent = <&plic0>;
+                    msi-parent = <&pcie0>;
+                    msi-controller;
+                    bus-range = <0x00 0x7f>;
+                    ranges = <0x03000000 0x0 0x78000000 0x0 0x78000000 0x0 0x04000000>;
+                    pcie_intc0: interrupt-controller {
+                        #address-cells = <0>;
+                        #interrupt-cells = <1>;
+                        interrupt-controller;
+                    };
+            };
+    };
-- 
2.25.1

[PATCH v20 3/4] PCI: microchip: Add host driver for Microchip PCIe controller

[daire.mcnamara]

From: Daire McNamara <daire.mcnamara@microchip.com>

Add support for the Microchip PolarFire PCIe controller when
configured in host (Root Complex) mode.

Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/Kconfig               |   10 +
 drivers/pci/controller/Makefile              |    1 +
 drivers/pci/controller/pcie-microchip-host.c | 1115 ++++++++++++++++++
 3 files changed, 1126 insertions(+)
 create mode 100644 drivers/pci/controller/pcie-microchip-host.c

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 64e2f5e379aa..bca2f8949510 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -298,6 +298,16 @@ config PCI_LOONGSON
 	  Say Y here if you want to enable PCI controller support on
 	  Loongson systems.
 
+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
+	select PCI_HOST_COMMON
+	help
+	  Say Y here if you want kernel to support the Microchip AXI PCIe
+	  Host Bridge driver.
+
 config PCIE_HISI_ERR
 	depends on ACPI_APEI_GHES && (ARM64 || COMPILE_TEST)
 	bool "HiSilicon HIP PCIe controller error handling driver"
diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile
index 04c6edc285c5..b85fcd574ff6 100644
--- a/drivers/pci/controller/Makefile
+++ b/drivers/pci/controller/Makefile
@@ -28,6 +28,7 @@ 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-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o
 obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o
diff --git a/drivers/pci/controller/pcie-microchip-host.c b/drivers/pci/controller/pcie-microchip-host.c
new file mode 100644
index 000000000000..de44aaa5ca60
--- /dev/null
+++ b/drivers/pci/controller/pcie-microchip-host.c
@@ -0,0 +1,1115 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip AXI PCIe Bridge host controller driver
+ *
+ * Copyright (c) 2018 - 2020 Microchip Corporation. All rights reserved.
+ *
+ * Author: Daire McNamara <daire.mcnamara@microchip.com>
+ *
+ * Based on:
+ *	pcie-rcar.c
+ *	pcie-xilinx.c
+ *	pcie-altera.c
+ */
+
+#include <linux/clk.h>
+#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
+
+/* PCIe Bridge Phy and Controller Phy offsets */
+#define MC_PCIE1_BRIDGE_ADDR			0x00008000u
+#define MC_PCIE1_CTRL_ADDR			0x0000a000u
+
+#define MC_PCIE_BRIDGE_ADDR			(MC_PCIE1_BRIDGE_ADDR)
+#define MC_PCIE_CTRL_ADDR			(MC_PCIE1_CTRL_ADDR)
+
+/* PCIe Controller Phy Regs */
+#define SEC_ERROR_CNT				0x20
+#define DED_ERROR_CNT				0x24
+#define 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  NUM_SEC_ERROR_INTS			(4)
+#define SEC_ERROR_INT_MASK			0x2c
+#define 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  NUM_DED_ERROR_INTS			(4)
+#define DED_ERROR_INT_MASK			0x34
+#define ECC_CONTROL				0x38
+#define  ECC_CONTROL_TX_RAM_INJ_ERROR_0		BIT(0)
+#define  ECC_CONTROL_TX_RAM_INJ_ERROR_1		BIT(1)
+#define  ECC_CONTROL_TX_RAM_INJ_ERROR_2		BIT(2)
+#define  ECC_CONTROL_TX_RAM_INJ_ERROR_3		BIT(3)
+#define  ECC_CONTROL_RX_RAM_INJ_ERROR_0		BIT(4)
+#define  ECC_CONTROL_RX_RAM_INJ_ERROR_1		BIT(5)
+#define  ECC_CONTROL_RX_RAM_INJ_ERROR_2		BIT(6)
+#define  ECC_CONTROL_RX_RAM_INJ_ERROR_3		BIT(7)
+#define  ECC_CONTROL_PCIE2AXI_RAM_INJ_ERROR_0	BIT(8)
+#define  ECC_CONTROL_PCIE2AXI_RAM_INJ_ERROR_1	BIT(9)
+#define  ECC_CONTROL_PCIE2AXI_RAM_INJ_ERROR_2	BIT(10)
+#define  ECC_CONTROL_PCIE2AXI_RAM_INJ_ERROR_3	BIT(11)
+#define  ECC_CONTROL_AXI2PCIE_RAM_INJ_ERROR_0	BIT(12)
+#define  ECC_CONTROL_AXI2PCIE_RAM_INJ_ERROR_1	BIT(13)
+#define  ECC_CONTROL_AXI2PCIE_RAM_INJ_ERROR_2	BIT(14)
+#define  ECC_CONTROL_AXI2PCIE_RAM_INJ_ERROR_3	BIT(15)
+#define  ECC_CONTROL_TX_RAM_ECC_BYPASS		BIT(24)
+#define  ECC_CONTROL_RX_RAM_ECC_BYPASS		BIT(25)
+#define  ECC_CONTROL_PCIE2AXI_RAM_ECC_BYPASS	BIT(26)
+#define  ECC_CONTROL_AXI2PCIE_RAM_ECC_BYPASS	BIT(27)
+#define LTSSM_STATE				0x5c
+#define  LTSSM_L0_STATE				0x10
+#define 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_MASK			GENMASK(2, 0)
+#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)
+#define  PCIE_EVENT_INT_ENB_MASK		GENMASK(18, 16)
+#define  PCIE_EVENT_INT_ENB_SHIFT		16
+#define  NUM_PCIE_EVENTS			(3)
+
+/* PCIe Bridge Phy Regs */
+#define PCIE_PCI_IDS_DW1			0x9c
+
+/* PCIe Config space MSI capability structure */
+#define MC_MSI_CAP_CTRL_OFFSET			0xe0u
+#define  MC_MSI_MAX_Q_AVAIL			(MC_NUM_MSI_IRQS_CODED << 1)
+#define  MC_MSI_Q_SIZE				(MC_NUM_MSI_IRQS_CODED << 4)
+
+#define IMASK_LOCAL				0x180
+#define  DMA_END_ENGINE_0_MASK			0x00000000u
+#define  DMA_END_ENGINE_0_SHIFT			0
+#define  DMA_END_ENGINE_1_MASK			0x00000000u
+#define  DMA_END_ENGINE_1_SHIFT			1
+#define  DMA_ERROR_ENGINE_0_MASK		0x00000100u
+#define  DMA_ERROR_ENGINE_0_SHIFT		8
+#define  DMA_ERROR_ENGINE_1_MASK		0x00000200u
+#define  DMA_ERROR_ENGINE_1_SHIFT		9
+#define  A_ATR_EVT_POST_ERR_MASK		0x00010000u
+#define  A_ATR_EVT_POST_ERR_SHIFT		16
+#define  A_ATR_EVT_FETCH_ERR_MASK		0x00020000u
+#define  A_ATR_EVT_FETCH_ERR_SHIFT		17
+#define  A_ATR_EVT_DISCARD_ERR_MASK		0x00040000u
+#define  A_ATR_EVT_DISCARD_ERR_SHIFT		18
+#define  A_ATR_EVT_DOORBELL_MASK		0x00000000u
+#define  A_ATR_EVT_DOORBELL_SHIFT		19
+#define  P_ATR_EVT_POST_ERR_MASK		0x00100000u
+#define  P_ATR_EVT_POST_ERR_SHIFT		20
+#define  P_ATR_EVT_FETCH_ERR_MASK		0x00200000u
+#define  P_ATR_EVT_FETCH_ERR_SHIFT		21
+#define  P_ATR_EVT_DISCARD_ERR_MASK		0x00400000u
+#define  P_ATR_EVT_DISCARD_ERR_SHIFT		22
+#define  P_ATR_EVT_DOORBELL_MASK		0x00000000u
+#define  P_ATR_EVT_DOORBELL_SHIFT		23
+#define  PM_MSI_INT_INTA_MASK			0x01000000u
+#define  PM_MSI_INT_INTA_SHIFT			24
+#define  PM_MSI_INT_INTB_MASK			0x02000000u
+#define  PM_MSI_INT_INTB_SHIFT			25
+#define  PM_MSI_INT_INTC_MASK			0x04000000u
+#define  PM_MSI_INT_INTC_SHIFT			26
+#define  PM_MSI_INT_INTD_MASK			0x08000000u
+#define  PM_MSI_INT_INTD_SHIFT			27
+#define  PM_MSI_INT_INTX_MASK			0x0f000000u
+#define  PM_MSI_INT_INTX_SHIFT			24
+#define  PM_MSI_INT_MSI_MASK			0x10000000u
+#define  PM_MSI_INT_MSI_SHIFT			28
+#define  PM_MSI_INT_AER_EVT_MASK		0x20000000u
+#define  PM_MSI_INT_AER_EVT_SHIFT		29
+#define  PM_MSI_INT_EVENTS_MASK			0x40000000u
+#define  PM_MSI_INT_EVENTS_SHIFT		30
+#define  PM_MSI_INT_SYS_ERR_MASK		0x80000000u
+#define  PM_MSI_INT_SYS_ERR_SHIFT		31
+#define  NUM_LOCAL_EVENTS			15
+#define ISTATUS_LOCAL				0x184
+#define IMASK_HOST				0x188
+#define ISTATUS_HOST				0x18c
+#define MSI_ADDR				0x190
+#define ISTATUS_MSI				0x194
+
+/* PCIe Master table init defines */
+#define ATR0_PCIE_WIN0_SRCADDR_PARAM		0x600u
+#define  ATR0_PCIE_ATR_SIZE			0x25
+#define  ATR0_PCIE_ATR_SIZE_SHIFT		1
+#define ATR0_PCIE_WIN0_SRC_ADDR			0x604u
+#define ATR0_PCIE_WIN0_TRSL_ADDR_LSB		0x608u
+#define ATR0_PCIE_WIN0_TRSL_ADDR_UDW		0x60cu
+#define ATR0_PCIE_WIN0_TRSL_PARAM		0x610u
+
+/* PCIe AXI slave table init defines */
+#define ATR0_AXI4_SLV0_SRCADDR_PARAM		0x800u
+#define  ATR_SIZE_SHIFT				1
+#define  ATR_IMPL_ENABLE			1
+#define ATR0_AXI4_SLV0_SRC_ADDR			0x804u
+#define ATR0_AXI4_SLV0_TRSL_ADDR_LSB		0x808u
+#define ATR0_AXI4_SLV0_TRSL_ADDR_UDW		0x80cu
+#define ATR0_AXI4_SLV0_TRSL_PARAM		0x810u
+#define  PCIE_TX_RX_INTERFACE			0x00000000u
+#define  PCIE_CONFIG_INTERFACE			0x00000001u
+
+#define ATR_ENTRY_SIZE				32
+
+#define EVENT_PCIE_L2_EXIT			0
+#define EVENT_PCIE_HOTRST_EXIT			1
+#define EVENT_PCIE_DLUP_EXIT			2
+#define EVENT_SEC_TX_RAM_SEC_ERR		3
+#define EVENT_SEC_RX_RAM_SEC_ERR		4
+#define EVENT_SEC_AXI2PCIE_RAM_SEC_ERR		5
+#define EVENT_SEC_PCIE2AXI_RAM_SEC_ERR		6
+#define EVENT_DED_TX_RAM_DED_ERR		7
+#define EVENT_DED_RX_RAM_DED_ERR		8
+#define EVENT_DED_AXI2PCIE_RAM_DED_ERR		9
+#define EVENT_DED_PCIE2AXI_RAM_DED_ERR		10
+#define EVENT_LOCAL_DMA_END_ENGINE_0		11
+#define EVENT_LOCAL_DMA_END_ENGINE_1		12
+#define EVENT_LOCAL_DMA_ERROR_ENGINE_0		13
+#define EVENT_LOCAL_DMA_ERROR_ENGINE_1		14
+#define EVENT_LOCAL_A_ATR_EVT_POST_ERR		15
+#define EVENT_LOCAL_A_ATR_EVT_FETCH_ERR		16
+#define EVENT_LOCAL_A_ATR_EVT_DISCARD_ERR	17
+#define EVENT_LOCAL_A_ATR_EVT_DOORBELL		18
+#define EVENT_LOCAL_P_ATR_EVT_POST_ERR		19
+#define EVENT_LOCAL_P_ATR_EVT_FETCH_ERR		20
+#define EVENT_LOCAL_P_ATR_EVT_DISCARD_ERR	21
+#define EVENT_LOCAL_P_ATR_EVT_DOORBELL		22
+#define EVENT_LOCAL_PM_MSI_INT_INTX		23
+#define EVENT_LOCAL_PM_MSI_INT_MSI		24
+#define EVENT_LOCAL_PM_MSI_INT_AER_EVT		25
+#define EVENT_LOCAL_PM_MSI_INT_EVENTS		26
+#define EVENT_LOCAL_PM_MSI_INT_SYS_ERR		27
+#define NUM_EVENTS				28
+
+#define PCIE_EVENT_CAUSE(x, s)	\
+	[EVENT_PCIE_ ## x] = { __stringify(x), s }
+
+#define SEC_ERROR_CAUSE(x, s) \
+	[EVENT_SEC_ ## x] = { __stringify(x), s }
+
+#define DED_ERROR_CAUSE(x, s) \
+	[EVENT_DED_ ## x] = { __stringify(x), s }
+
+#define LOCAL_EVENT_CAUSE(x, s) \
+	[EVENT_LOCAL_ ## x] = { __stringify(x), s }
+
+#define PCIE_EVENT(x) \
+	.base = MC_PCIE_CTRL_ADDR, \
+	.offset = PCIE_EVENT_INT, \
+	.mask_offset = PCIE_EVENT_INT, \
+	.mask_high = 1, \
+	.mask = PCIE_EVENT_INT_ ## x ## _INT, \
+	.enb_mask = PCIE_EVENT_INT_ENB_MASK
+
+#define SEC_EVENT(x) \
+	.base = MC_PCIE_CTRL_ADDR, \
+	.offset = SEC_ERROR_INT, \
+	.mask_offset = SEC_ERROR_INT_MASK, \
+	.mask = SEC_ERROR_INT_ ## x ## _INT, \
+	.mask_high = 1, \
+	.enb_mask = 0
+
+#define DED_EVENT(x) \
+	.base = MC_PCIE_CTRL_ADDR, \
+	.offset = DED_ERROR_INT, \
+	.mask_offset = DED_ERROR_INT_MASK, \
+	.mask_high = 1, \
+	.mask = DED_ERROR_INT_ ## x ## _INT, \
+	.enb_mask = 0
+
+#define LOCAL_EVENT(x) \
+	.base = MC_PCIE_BRIDGE_ADDR, \
+	.offset = ISTATUS_LOCAL, \
+	.mask_offset = IMASK_LOCAL, \
+	.mask_high = 0, \
+	.mask = x ## _MASK, \
+	.enb_mask = 0
+
+#define PCIE_EVENT_TO_EVENT_MAP(x) \
+	{ PCIE_EVENT_INT_ ## x ## _INT, EVENT_PCIE_ ## x }
+
+#define SEC_ERROR_TO_EVENT_MAP(x) \
+	{ SEC_ERROR_INT_ ## x ## _INT, EVENT_SEC_ ## x }
+
+#define DED_ERROR_TO_EVENT_MAP(x) \
+	{ DED_ERROR_INT_ ## x ## _INT, EVENT_DED_ ## x }
+
+#define LOCAL_STATUS_TO_EVENT_MAP(x) \
+	{ x ## _MASK, EVENT_LOCAL_ ## x }
+
+struct event_map {
+	u32 reg_mask;
+	u32 event_bit;
+};
+
+struct mc_msi {
+	struct mutex lock;		/* Protect used bitmap */
+	struct irq_domain *msi_domain;
+	struct irq_domain *dev_domain;
+	u32 num_vectors;
+	u64 vector_phy;
+	DECLARE_BITMAP(used, MC_NUM_MSI_IRQS);
+};
+
+struct mc_port {
+	void __iomem *axi_base_addr;
+	struct device *dev;
+	struct irq_domain *intx_domain;
+	struct irq_domain *event_domain;
+	raw_spinlock_t lock;
+	struct mc_msi msi;
+};
+
+struct cause {
+	const char *sym;
+	const char *str;
+};
+
+static const struct cause event_cause[NUM_EVENTS] = {
+	PCIE_EVENT_CAUSE(L2_EXIT, "L2 exit event"),
+	PCIE_EVENT_CAUSE(HOTRST_EXIT, "Hot reset exit event"),
+	PCIE_EVENT_CAUSE(DLUP_EXIT, "DLUP exit event"),
+	SEC_ERROR_CAUSE(TX_RAM_SEC_ERR,  "sec error in tx buffer"),
+	SEC_ERROR_CAUSE(RX_RAM_SEC_ERR,  "sec error in rx buffer"),
+	SEC_ERROR_CAUSE(PCIE2AXI_RAM_SEC_ERR,  "sec error in pcie2axi buffer"),
+	SEC_ERROR_CAUSE(AXI2PCIE_RAM_SEC_ERR,  "sec error in axi2pcie buffer"),
+	DED_ERROR_CAUSE(TX_RAM_DED_ERR,  "ded error in tx buffer"),
+	DED_ERROR_CAUSE(RX_RAM_DED_ERR,  "ded error in rx buffer"),
+	DED_ERROR_CAUSE(PCIE2AXI_RAM_DED_ERR,  "ded error in pcie2axi buffer"),
+	DED_ERROR_CAUSE(AXI2PCIE_RAM_DED_ERR,  "ded error in axi2pcie buffer"),
+	LOCAL_EVENT_CAUSE(DMA_ERROR_ENGINE_0, "dma engine 0 error"),
+	LOCAL_EVENT_CAUSE(DMA_ERROR_ENGINE_1, "dma engine 1 error"),
+	LOCAL_EVENT_CAUSE(A_ATR_EVT_POST_ERR, "axi write request error"),
+	LOCAL_EVENT_CAUSE(A_ATR_EVT_FETCH_ERR, "axi read request error"),
+	LOCAL_EVENT_CAUSE(A_ATR_EVT_DISCARD_ERR, "axi read timeout"),
+	LOCAL_EVENT_CAUSE(P_ATR_EVT_POST_ERR, "pcie write request error"),
+	LOCAL_EVENT_CAUSE(P_ATR_EVT_FETCH_ERR, "pcie read request error"),
+	LOCAL_EVENT_CAUSE(P_ATR_EVT_DISCARD_ERR, "pcie read timeout"),
+	LOCAL_EVENT_CAUSE(PM_MSI_INT_AER_EVT, "aer event"),
+	LOCAL_EVENT_CAUSE(PM_MSI_INT_EVENTS, "pm/ltr/hotplug event"),
+	LOCAL_EVENT_CAUSE(PM_MSI_INT_SYS_ERR, "system error"),
+};
+
+struct event_map pcie_event_to_event[] = {
+	PCIE_EVENT_TO_EVENT_MAP(L2_EXIT),
+	PCIE_EVENT_TO_EVENT_MAP(HOTRST_EXIT),
+	PCIE_EVENT_TO_EVENT_MAP(DLUP_EXIT)
+};
+
+struct event_map sec_error_to_event[] = {
+	SEC_ERROR_TO_EVENT_MAP(TX_RAM_SEC_ERR),
+	SEC_ERROR_TO_EVENT_MAP(RX_RAM_SEC_ERR),
+	SEC_ERROR_TO_EVENT_MAP(PCIE2AXI_RAM_SEC_ERR),
+	SEC_ERROR_TO_EVENT_MAP(AXI2PCIE_RAM_SEC_ERR)
+};
+
+struct event_map ded_error_to_event[] = {
+	DED_ERROR_TO_EVENT_MAP(TX_RAM_DED_ERR),
+	DED_ERROR_TO_EVENT_MAP(RX_RAM_DED_ERR),
+	DED_ERROR_TO_EVENT_MAP(PCIE2AXI_RAM_DED_ERR),
+	DED_ERROR_TO_EVENT_MAP(AXI2PCIE_RAM_DED_ERR)
+};
+
+struct event_map local_status_to_event[] = {
+	LOCAL_STATUS_TO_EVENT_MAP(DMA_END_ENGINE_0),
+	LOCAL_STATUS_TO_EVENT_MAP(DMA_END_ENGINE_1),
+	LOCAL_STATUS_TO_EVENT_MAP(DMA_ERROR_ENGINE_0),
+	LOCAL_STATUS_TO_EVENT_MAP(DMA_ERROR_ENGINE_1),
+	LOCAL_STATUS_TO_EVENT_MAP(A_ATR_EVT_POST_ERR),
+	LOCAL_STATUS_TO_EVENT_MAP(A_ATR_EVT_FETCH_ERR),
+	LOCAL_STATUS_TO_EVENT_MAP(A_ATR_EVT_DISCARD_ERR),
+	LOCAL_STATUS_TO_EVENT_MAP(A_ATR_EVT_DOORBELL),
+	LOCAL_STATUS_TO_EVENT_MAP(P_ATR_EVT_POST_ERR),
+	LOCAL_STATUS_TO_EVENT_MAP(P_ATR_EVT_FETCH_ERR),
+	LOCAL_STATUS_TO_EVENT_MAP(P_ATR_EVT_DISCARD_ERR),
+	LOCAL_STATUS_TO_EVENT_MAP(P_ATR_EVT_DOORBELL),
+	LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_INTX),
+	LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_MSI),
+	LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_AER_EVT),
+	LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_EVENTS),
+	LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_SYS_ERR),
+};
+
+struct {
+	u32 base;
+	u32 offset;
+	u32 mask;
+	u32 shift;
+	u32 enb_mask;
+	u32 mask_high;
+	u32 mask_offset;
+} event_descs[] = {
+	{ PCIE_EVENT(L2_EXIT) },
+	{ PCIE_EVENT(HOTRST_EXIT) },
+	{ PCIE_EVENT(DLUP_EXIT) },
+	{ SEC_EVENT(TX_RAM_SEC_ERR) },
+	{ SEC_EVENT(RX_RAM_SEC_ERR) },
+	{ SEC_EVENT(PCIE2AXI_RAM_SEC_ERR) },
+	{ SEC_EVENT(AXI2PCIE_RAM_SEC_ERR) },
+	{ DED_EVENT(TX_RAM_DED_ERR) },
+	{ DED_EVENT(RX_RAM_DED_ERR) },
+	{ DED_EVENT(PCIE2AXI_RAM_DED_ERR) },
+	{ DED_EVENT(AXI2PCIE_RAM_DED_ERR) },
+	{ LOCAL_EVENT(DMA_END_ENGINE_0) },
+	{ LOCAL_EVENT(DMA_END_ENGINE_1) },
+	{ LOCAL_EVENT(DMA_ERROR_ENGINE_0) },
+	{ LOCAL_EVENT(DMA_ERROR_ENGINE_1) },
+	{ LOCAL_EVENT(A_ATR_EVT_POST_ERR) },
+	{ LOCAL_EVENT(A_ATR_EVT_FETCH_ERR) },
+	{ LOCAL_EVENT(A_ATR_EVT_DISCARD_ERR) },
+	{ LOCAL_EVENT(A_ATR_EVT_DOORBELL) },
+	{ LOCAL_EVENT(P_ATR_EVT_POST_ERR) },
+	{ LOCAL_EVENT(P_ATR_EVT_FETCH_ERR) },
+	{ LOCAL_EVENT(P_ATR_EVT_DISCARD_ERR) },
+	{ LOCAL_EVENT(P_ATR_EVT_DOORBELL) },
+	{ LOCAL_EVENT(PM_MSI_INT_INTX) },
+	{ LOCAL_EVENT(PM_MSI_INT_MSI) },
+	{ LOCAL_EVENT(PM_MSI_INT_AER_EVT) },
+	{ LOCAL_EVENT(PM_MSI_INT_EVENTS) },
+	{ LOCAL_EVENT(PM_MSI_INT_SYS_ERR) }
+};
+
+static char poss_clks[][5] = { "fic0", "fic1", "fic2", "fic3" };
+
+static void mc_pcie_enable_msi(struct mc_port *port, void __iomem *base)
+{
+	struct mc_msi *msi = &port->msi;
+	u32 cap_offset = MC_MSI_CAP_CTRL_OFFSET;
+	u16 msg_ctrl = readw_relaxed(base + cap_offset + PCI_MSI_FLAGS);
+
+	msg_ctrl |= PCI_MSI_FLAGS_ENABLE;
+	msg_ctrl &= ~PCI_MSI_FLAGS_QMASK;
+	msg_ctrl |= MC_MSI_MAX_Q_AVAIL;
+	msg_ctrl &= ~PCI_MSI_FLAGS_QSIZE;
+	msg_ctrl |= MC_MSI_Q_SIZE;
+	msg_ctrl |= PCI_MSI_FLAGS_64BIT;
+
+	writew_relaxed(msg_ctrl, base + cap_offset + PCI_MSI_FLAGS);
+
+	writel_relaxed(lower_32_bits(msi->vector_phy), base + cap_offset + PCI_MSI_ADDRESS_LO);
+	writel_relaxed(upper_32_bits(msi->vector_phy), base + cap_offset + PCI_MSI_ADDRESS_HI);
+}
+
+static void mc_handle_msi(struct irq_desc *desc)
+{
+	struct mc_port *port = irq_desc_get_handler_data(desc);
+	struct device *dev = port->dev;
+	struct mc_msi *msi = &port->msi;
+	void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	unsigned long status;
+	u32 bit;
+	u32 virq;
+
+	status = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
+	if (status & PM_MSI_INT_MSI_MASK) {
+		status = readl_relaxed(bridge_base_addr + ISTATUS_MSI);
+		for_each_set_bit(bit, &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);
+		}
+	}
+}
+
+static void mc_msi_bottom_irq_ack(struct irq_data *data)
+{
+	struct mc_port *port = irq_data_get_irq_chip_data(data);
+	void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	u32 bitpos = data->hwirq;
+	unsigned long status;
+
+	writel_relaxed(BIT(bitpos), bridge_base_addr + ISTATUS_MSI);
+	status = readl_relaxed(bridge_base_addr + ISTATUS_MSI);
+	if (!status)
+		writel_relaxed(BIT(PM_MSI_INT_MSI_SHIFT), bridge_base_addr + ISTATUS_LOCAL);
+}
+
+static void mc_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+	struct mc_port *port = irq_data_get_irq_chip_data(data);
+	phys_addr_t addr = port->msi.vector_phy;
+
+	msg->address_lo = lower_32_bits(addr);
+	msg->address_hi = upper_32_bits(addr);
+	msg->data = data->hwirq;
+
+	dev_dbg(port->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_ack = mc_msi_bottom_irq_ack,
+	.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_port *port = domain->host_data;
+	struct mc_msi *msi = &port->msi;
+	void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	unsigned long bit;
+	u32 val;
+
+	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);
+
+	irq_domain_set_info(domain, virq, bit, &mc_msi_bottom_irq_chip, domain->host_data,
+			    handle_edge_irq, NULL, NULL);
+
+	/* Enable MSI interrupts */
+	val = readl_relaxed(bridge_base_addr + IMASK_LOCAL);
+	val |= PM_MSI_INT_MSI_MASK;
+	writel_relaxed(val, bridge_base_addr + IMASK_LOCAL);
+
+	mutex_unlock(&msi->lock);
+
+	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_port *port = irq_data_get_irq_chip_data(d);
+	struct mc_msi *msi = &port->msi;
+
+	mutex_lock(&msi->lock);
+
+	if (test_bit(d->hwirq, msi->used))
+		__clear_bit(d->hwirq, msi->used);
+	else
+		dev_err(port->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 struct irq_chip mc_msi_irq_chip = {
+	.name = "Microchip PCIe MSI",
+	.irq_ack = irq_chip_ack_parent,
+	.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 int mc_allocate_msi_domains(struct mc_port *port)
+{
+	struct device *dev = port->dev;
+	struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
+	struct mc_msi *msi = &port->msi;
+
+	mutex_init(&port->msi.lock);
+
+	msi->dev_domain = irq_domain_add_linear(NULL, msi->num_vectors, &msi_domain_ops, port);
+	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 void mc_handle_intx(struct irq_desc *desc)
+{
+	struct mc_port *port = irq_desc_get_handler_data(desc);
+	struct device *dev = port->dev;
+	void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	unsigned long status;
+	u32 bit;
+	u32 virq;
+
+	status = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
+	if (status & PM_MSI_INT_INTX_MASK) {
+		status &= PM_MSI_INT_INTX_MASK;
+		status >>= PM_MSI_INT_INTX_SHIFT;
+		for_each_set_bit(bit, &status, PCI_NUM_INTX) {
+			virq = irq_find_mapping(port->intx_domain, bit);
+			if (virq)
+				generic_handle_irq(virq);
+			else
+				dev_err_ratelimited(dev, "bad INTx IRQ %d\n", bit);
+		}
+	}
+}
+
+static void mc_ack_intx_irq(struct irq_data *data)
+{
+	struct mc_port *port = irq_data_get_irq_chip_data(data);
+	void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	u32 mask = BIT(data->hwirq + PM_MSI_INT_INTX_SHIFT);
+
+	writel_relaxed(mask, bridge_base_addr + ISTATUS_LOCAL);
+}
+
+static void mc_mask_intx_irq(struct irq_data *data)
+{
+	struct mc_port *port = irq_data_get_irq_chip_data(data);
+	void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	unsigned long flags;
+	u32 mask = BIT(data->hwirq + PM_MSI_INT_INTX_SHIFT);
+	u32 val;
+
+	raw_spin_lock_irqsave(&port->lock, flags);
+	val = readl_relaxed(bridge_base_addr + IMASK_LOCAL);
+	val &= ~mask;
+	writel_relaxed(val, bridge_base_addr + IMASK_LOCAL);
+	raw_spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void mc_unmask_intx_irq(struct irq_data *data)
+{
+	struct mc_port *port = irq_data_get_irq_chip_data(data);
+	void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	unsigned long flags;
+	u32 mask = BIT(data->hwirq + PM_MSI_INT_INTX_SHIFT);
+	u32 val;
+
+	raw_spin_lock_irqsave(&port->lock, flags);
+	val = readl_relaxed(bridge_base_addr + IMASK_LOCAL);
+	val |= mask;
+	writel_relaxed(val, bridge_base_addr + IMASK_LOCAL);
+	raw_spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static struct irq_chip mc_intx_irq_chip = {
+	.name = "Microchip PCIe INTx",
+	.irq_ack = mc_ack_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_level_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 inline u32 reg_to_event(u32 reg, struct event_map field)
+{
+	u32 val;
+
+	val = (reg & field.reg_mask) ? BIT(field.event_bit) : 0;
+
+	return val;
+}
+
+static u32 pcie_events(void __iomem *addr)
+{
+	u32 reg = readl_relaxed(addr);
+	u32 val = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(pcie_event_to_event); i++)
+		val |= reg_to_event(reg, pcie_event_to_event[i]);
+
+	return val;
+}
+
+static u32 sec_errors(void __iomem *addr)
+{
+	u32 reg = readl_relaxed(addr);
+	u32 val = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sec_error_to_event); i++)
+		val |= reg_to_event(reg, sec_error_to_event[i]);
+
+	return val;
+}
+
+static u32 ded_errors(void __iomem *addr)
+{
+	u32 reg = readl_relaxed(addr);
+	u32 val = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ded_error_to_event); i++)
+		val |= reg_to_event(reg, ded_error_to_event[i]);
+
+	return val;
+}
+
+static u32 local_events(void __iomem *addr)
+{
+	u32 reg = readl_relaxed(addr);
+	u32 val = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(local_status_to_event); i++)
+		val |= reg_to_event(reg, local_status_to_event[i]);
+
+	return val;
+}
+
+static u32 get_events(struct mc_port *port)
+{
+	void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	void __iomem *ctrl_base_addr = port->axi_base_addr + MC_PCIE_CTRL_ADDR;
+	u32 events = 0;
+
+	events |= pcie_events(ctrl_base_addr + PCIE_EVENT_INT);
+	events |= sec_errors(ctrl_base_addr + SEC_ERROR_INT);
+	events |= ded_errors(ctrl_base_addr + DED_ERROR_INT);
+	events |= local_events(bridge_base_addr + ISTATUS_LOCAL);
+
+	return events;
+}
+
+static irqreturn_t mc_event_handler(int irq, void *dev_id)
+{
+	struct mc_port *port = dev_id;
+	struct device *dev = port->dev;
+	struct irq_data *data;
+
+	data = irq_domain_get_irq_data(port->event_domain, irq);
+
+	if (event_cause[data->hwirq].str)
+		dev_err_ratelimited(dev, "%s\n", event_cause[data->hwirq].str);
+	else
+		dev_err_ratelimited(dev, "bad event IRQ %ld\n", data->hwirq);
+
+	return IRQ_HANDLED;
+}
+
+static void mc_handle_event(struct irq_desc *desc)
+{
+	struct mc_port *port = irq_desc_get_handler_data(desc);
+	unsigned long events;
+	u32 bit;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+
+	chained_irq_enter(chip, desc);
+
+	events = get_events(port);
+
+	for_each_set_bit(bit, &events, NUM_EVENTS)
+		generic_handle_irq(irq_find_mapping(port->event_domain, bit));
+
+	chained_irq_exit(chip, desc);
+}
+
+static void mc_ack_event_irq(struct irq_data *data)
+{
+	struct mc_port *port = irq_data_get_irq_chip_data(data);
+	u32 event = data->hwirq;
+	void __iomem *addr;
+	u32 mask;
+
+	addr = port->axi_base_addr + event_descs[event].base + event_descs[event].offset;
+	mask = event_descs[event].mask;
+	mask |= event_descs[event].enb_mask;
+
+	writel_relaxed(mask, addr);
+}
+
+static void mc_mask_event_irq(struct irq_data *data)
+{
+	struct mc_port *port = irq_data_get_irq_chip_data(data);
+	u32 event = data->hwirq;
+	void __iomem *addr;
+	u32 mask;
+	u32 val;
+
+	addr = port->axi_base_addr + event_descs[event].base + event_descs[event].mask_offset;
+	mask = event_descs[event].mask;
+	if (event_descs[event].enb_mask) {
+		mask <<= PCIE_EVENT_INT_ENB_SHIFT;
+		mask &= PCIE_EVENT_INT_ENB_MASK;
+	}
+
+	if (!event_descs[event].mask_high)
+		mask = ~mask;
+
+	raw_spin_lock(&port->lock);
+	val = readl_relaxed(addr);
+	if (event_descs[event].mask_high)
+		val |= mask;
+	else
+		val &= mask;
+
+	writel_relaxed(val, addr);
+	raw_spin_unlock(&port->lock);
+}
+
+static void mc_unmask_event_irq(struct irq_data *data)
+{
+	struct mc_port *port = irq_data_get_irq_chip_data(data);
+	u32 event = data->hwirq;
+	void __iomem *addr;
+	u32 mask;
+	u32 val;
+
+	addr = port->axi_base_addr + event_descs[event].base + event_descs[event].mask_offset;
+	mask = event_descs[event].mask;
+
+	if (event_descs[event].enb_mask)
+		mask <<= PCIE_EVENT_INT_ENB_SHIFT;
+
+	if (event_descs[event].mask_high)
+		mask = ~mask;
+
+	if (event_descs[event].enb_mask)
+		mask &= PCIE_EVENT_INT_ENB_MASK;
+
+	raw_spin_lock(&port->lock);
+	val = readl_relaxed(addr);
+	if (event_descs[event].mask_high)
+		val &= mask;
+	else
+		val |= mask;
+	writel_relaxed(val, addr);
+	raw_spin_unlock(&port->lock);
+}
+
+static struct irq_chip mc_event_irq_chip = {
+	.name = "Microchip PCIe EVENT",
+	.irq_ack = mc_ack_event_irq,
+	.irq_mask = mc_mask_event_irq,
+	.irq_unmask = mc_unmask_event_irq,
+};
+
+static int mc_pcie_event_map(struct irq_domain *domain, unsigned int irq,
+			     irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &mc_event_irq_chip, handle_level_irq);
+	irq_set_chip_data(irq, domain->host_data);
+
+	return 0;
+}
+
+static const struct irq_domain_ops event_domain_ops = {
+	.map = mc_pcie_event_map,
+};
+
+static inline struct clk *mc_pcie_init_clk(struct device *dev, const char *id)
+{
+	struct clk *clk;
+	int ret;
+
+	clk = devm_clk_get_optional(dev, id);
+	if (IS_ERR(clk))
+		return clk;
+	if (!clk)
+		return clk;
+
+	ret = clk_prepare_enable(clk);
+	if (ret)
+		return ERR_PTR(ret);
+
+	devm_add_action_or_reset(dev, (void (*) (void *))clk_disable_unprepare, clk);
+
+	return clk;
+}
+
+static int mc_pcie_init_clks(struct device *dev)
+{
+	struct clk *fic;
+	int i;
+
+	/*
+	 * PCIe may be clocked via Fabric Interface
+	 * using between 1 and 4 clocks. Scan DT for
+	 * clocks and enable them if present
+	 */
+	for (i = 0; i < ARRAY_SIZE(poss_clks); i++) {
+		fic = mc_pcie_init_clk(dev, poss_clks[i]);
+		if (IS_ERR(fic))
+			return PTR_ERR(fic);
+	}
+
+	return 0;
+}
+
+static int mc_pcie_init_irq_domains(struct mc_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, "failed to find PCIe Intc node\n");
+		return -EINVAL;
+	}
+
+	port->event_domain = irq_domain_add_linear(pcie_intc_node, NUM_EVENTS, &event_domain_ops,
+						   port);
+	if (!port->event_domain) {
+		dev_err(dev, "failed to get event domain\n");
+		return -ENOMEM;
+	}
+
+	irq_domain_update_bus_token(port->event_domain, DOMAIN_BUS_NEXUS);
+
+	port->intx_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX, &intx_domain_ops,
+						  port);
+	if (!port->intx_domain) {
+		dev_err(dev, "failed to get an INTx IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	irq_domain_update_bus_token(port->intx_domain, DOMAIN_BUS_WIRED);
+
+	of_node_put(pcie_intc_node);
+	raw_spin_lock_init(&port->lock);
+
+	return mc_allocate_msi_domains(port);
+}
+
+static void mc_pcie_setup_window(void __iomem *bridge_base_addr, u32 index, phys_addr_t axi_addr,
+				 phys_addr_t pci_addr, size_t size)
+{
+	u32 atr_sz = ilog2(size) - 1;
+	u32 val;
+
+	if (index == 0)
+		val = PCIE_CONFIG_INTERFACE;
+	else
+		val = PCIE_TX_RX_INTERFACE;
+
+	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) + ATR0_AXI4_SLV0_TRSL_PARAM);
+
+	val = lower_32_bits(axi_addr) | (atr_sz << ATR_SIZE_SHIFT) | ATR_IMPL_ENABLE;
+	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) +
+	       ATR0_AXI4_SLV0_SRCADDR_PARAM);
+
+	val = upper_32_bits(axi_addr);
+	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) +
+	       ATR0_AXI4_SLV0_SRC_ADDR);
+
+	val = lower_32_bits(pci_addr);
+	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) +
+	       ATR0_AXI4_SLV0_TRSL_ADDR_LSB);
+
+	val = upper_32_bits(pci_addr);
+	writel(val, bridge_base_addr + (index * ATR_ENTRY_SIZE) +
+	       ATR0_AXI4_SLV0_TRSL_ADDR_UDW);
+
+	val = readl(bridge_base_addr + ATR0_PCIE_WIN0_SRCADDR_PARAM);
+	val |= (ATR0_PCIE_ATR_SIZE << ATR0_PCIE_ATR_SIZE_SHIFT);
+	writel(val, bridge_base_addr + ATR0_PCIE_WIN0_SRCADDR_PARAM);
+	writel(0, bridge_base_addr + ATR0_PCIE_WIN0_SRC_ADDR);
+}
+
+static int mc_pcie_setup_windows(struct platform_device *pdev, struct mc_port *port)
+{
+	void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
+	struct resource_entry *entry;
+	u64 pci_addr;
+	u32 index = 1;
+
+	resource_list_for_each_entry(entry, &bridge->windows) {
+		if (resource_type(entry->res) == IORESOURCE_MEM) {
+			pci_addr = entry->res->start - entry->offset;
+			mc_pcie_setup_window(bridge_base_addr, index, entry->res->start,
+					     pci_addr, resource_size(entry->res));
+			index++;
+		}
+	}
+
+	return 0;
+}
+
+static int mc_platform_init(struct pci_config_window *cfg)
+{
+	struct device *dev = cfg->parent;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct mc_port *port;
+	void __iomem *bridge_base_addr;
+	void __iomem *ctrl_base_addr;
+	int ret;
+	int irq;
+	int i, intx_irq, msi_irq, event_irq;
+	u32 val;
+	int err;
+
+	port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
+	if (!port)
+		return -ENOMEM;
+	port->dev = dev;
+
+	ret = mc_pcie_init_clks(dev);
+	if (ret) {
+		dev_err(dev, "failed to get clock resources, error %d\n", ret);
+		return -ENODEV;
+	}
+
+	port->axi_base_addr = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(port->axi_base_addr))
+		return PTR_ERR(port->axi_base_addr);
+
+	bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
+	ctrl_base_addr = port->axi_base_addr + MC_PCIE_CTRL_ADDR;
+
+	port->msi.vector_phy = MSI_ADDR;
+	port->msi.num_vectors = MC_NUM_MSI_IRQS;
+	ret = mc_pcie_init_irq_domains(port);
+	if (ret) {
+		dev_err(dev, "failed creating IRQ domains\n");
+		return ret;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev, "unable to request IRQ%d\n", irq);
+		return -ENODEV;
+	}
+
+	for (i = 0; i < NUM_EVENTS; i++) {
+		event_irq = irq_create_mapping(port->event_domain, i);
+		if (!event_irq) {
+			dev_err(dev, "failed to map interrupt\n");
+			return -ENXIO;
+		}
+
+		err = devm_request_irq(dev, event_irq, mc_event_handler,
+				       0, event_cause[i].sym, port);
+		if (err) {
+			dev_err(dev, "failed to request IRQ %d\n", event_irq);
+			return err;
+		}
+	}
+
+	intx_irq = irq_create_mapping(port->event_domain, EVENT_LOCAL_PM_MSI_INT_INTX);
+	if (!intx_irq) {
+		dev_err(dev, "failed to map INTx interrupt\n");
+		return -ENXIO;
+	}
+
+	/* Plug the INTx chained handler */
+	irq_set_chained_handler_and_data(intx_irq, mc_handle_intx, port);
+
+	msi_irq = irq_create_mapping(port->event_domain, EVENT_LOCAL_PM_MSI_INT_MSI);
+	if (!msi_irq)
+		return -ENXIO;
+
+	/* Plug the MSI chained handler */
+	irq_set_chained_handler_and_data(msi_irq, mc_handle_msi, port);
+
+	/* Plug the main event chained handler */
+	irq_set_chained_handler_and_data(irq, mc_handle_event, port);
+
+	/* Hardware doesn't setup MSI by default */
+	mc_pcie_enable_msi(port, cfg->win);
+
+	val = readl_relaxed(bridge_base_addr + IMASK_LOCAL);
+	val |= PM_MSI_INT_INTX_MASK;
+	writel_relaxed(val, bridge_base_addr + IMASK_LOCAL);
+
+	writel_relaxed(val, ctrl_base_addr + ECC_CONTROL);
+
+	val = PCIE_EVENT_INT_L2_EXIT_INT | PCIE_EVENT_INT_HOTRST_EXIT_INT |
+	      PCIE_EVENT_INT_DLUP_EXIT_INT;
+	writel_relaxed(val, ctrl_base_addr + 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_relaxed(val, ctrl_base_addr + SEC_ERROR_INT);
+	writel_relaxed(0, ctrl_base_addr + SEC_ERROR_INT_MASK);
+	writel_relaxed(0, ctrl_base_addr + SEC_ERROR_CNT);
+
+	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_relaxed(val, ctrl_base_addr + DED_ERROR_INT);
+	writel_relaxed(0, ctrl_base_addr + DED_ERROR_INT_MASK);
+	writel_relaxed(0, ctrl_base_addr + DED_ERROR_CNT);
+
+	writel_relaxed(0, bridge_base_addr + IMASK_HOST);
+	writel_relaxed(GENMASK(31, 0), bridge_base_addr + ISTATUS_HOST);
+
+	/* Configure Address Translation Table 0 for PCIe config space */
+	mc_pcie_setup_window(bridge_base_addr, 0, cfg->res.start & 0xffffffff, cfg->res.start,
+			     resource_size(&cfg->res));
+
+	return mc_pcie_setup_windows(pdev, port);
+}
+
+static const struct pci_ecam_ops mc_ecam_ops = {
+	.bus_shift = 20,
+	.init = mc_platform_init,
+	.pci_ops = {
+		.map_bus = pci_ecam_map_bus,
+		.read = pci_generic_config_read,
+		.write = pci_generic_config_write,
+	}
+};
+
+static const struct of_device_id mc_pcie_of_match[] = {
+	{
+		.compatible = "microchip,pcie-host-1.0",
+		.data = &mc_ecam_ops,
+	},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, mc_pcie_of_match)
+
+static struct platform_driver mc_pcie_driver = {
+	.probe = pci_host_common_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@microchip.com>");
-- 
2.25.1

[PATCH v20 4/4] MAINTAINERS: Add Daire McNamara as maintainer for the Microchip PCIe driver

[daire.mcnamara]

From: Daire McNamara <daire.mcnamara@microchip.com>

Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
---
 MAINTAINERS | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e73636b75f29..f2dafbf3393c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13628,6 +13628,13 @@ S:	Supported
 F:	Documentation/devicetree/bindings/pci/mediatek*
 F:	drivers/pci/controller/*mediatek*
 
+PCIE DRIVER FOR MICROCHIP
+M:	Daire McNamara <daire.mcnamara@microchip.com>
+L:	linux-pci@vger.kernel.org
+S:	Supported
+F:	Documentation/devicetree/bindings/pci/microchip*
+F:	drivers/pci/controller/*microchip*
+
 PCIE DRIVER FOR QUALCOMM MSM
 M:	Stanimir Varbanov <svarbanov@mm-sol.com>
 L:	linux-pci@vger.kernel.org
-- 
2.25.1

Re: [PATCH v20 3/4] PCI: microchip: Add host driver for Microchip PCIe controller

[Leon Romanovsky]

On Fri, Jan 22, 2021 at 02:51:36PM +0000, daire.mcnamara@microchip.com wrote:
> From: Daire McNamara <daire.mcnamara@microchip.com>
>
> Add support for the Microchip PolarFire PCIe controller when
> configured in host (Root Complex) mode.
>
> Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
>  drivers/pci/controller/Kconfig               |   10 +
>  drivers/pci/controller/Makefile              |    1 +
>  drivers/pci/controller/pcie-microchip-host.c | 1115 ++++++++++++++++++
>  3 files changed, 1126 insertions(+)
>  create mode 100644 drivers/pci/controller/pcie-microchip-host.c

<...>

> +builtin_platform_driver(mc_pcie_driver);
> +MODULE_LICENSE("GPL v2");

We had this discussion lately, it should be "GPL" without "v2".

Thanks

Re: [PATCH v20 3/4] PCI: microchip: Add host driver for Microchip PCIe controller

[Leon Romanovsky]

On Mon, Jan 25, 2021 at 09:29:01AM +0000, Daire.McNamara@microchip.com wrote:
> Hi Leon,
>
> thanks.
>
> Just:
> > +builtin_platform_driver(mc_pcie_driver);
> > +MODULE_LICENSE("GPL v2");
> to
> > +builtin_platform_driver(mc_pcie_driver);
> > +MODULE_LICENSE("GPL");
>
> or does
> +// SPDX-License-Identifier: GPL-2.0
> need to change as well, to:
> +// SPDX-License-Identifier: GPL

You should change only MODULE_LICENSE(..) and leave SPDX as is.
See Documentation/process/license-rules.rst

  448     "GPL v2"                      Same as "GPL". It exists for historic
  449                                   reasons.

Thanks

Re: [PATCH v20 3/4] PCI: microchip: Add host driver for Microchip PCIe controller

[Krzysztof Wilczyński]

Hi Daire,

Thank you for working on this!

[...]
> +static const struct pci_ecam_ops mc_ecam_ops = {
> +	.bus_shift = 20,
> +	.init = mc_platform_init,
> +	.pci_ops = {
> +		.map_bus = pci_ecam_map_bus,
> +		.read = pci_generic_config_read,
> +		.write = pci_generic_config_write,
> +	}
> +};
[...]

If you are using standard ECAM, and it looks like you do, then you can
omit the .bus_shift initializer, as since the e7708f5b10e2 ("PCI: Unify
ECAM constants in native PCI Express drivers") we use the proper shift
value automatically for you, if you don't provide a custom one.

Alternatively, you can use the PCIE_ECAM_BUS_SHIFT constant, to avoid
open-coding the shift value.

Krzysztof