PCI: mobiveil: Add PCIe Gen4 EP driver for NXP Layerscape SoCs

This PCIe controller is based on the Mobiveil GPEX IP, it work in EP
mode if select this config opteration.

Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
[Zhiqiang: Correct the Copyright]
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

MAINTAINERS

@@ -12436,11 +12436,13 @@ F:	drivers/pci/controller/dwc/*layerscape*
 
 PCI DRIVER FOR NXP LAYERSCAPE GEN4 CONTROLLER
 M:	Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
+M:	Xiaowei Bao <xiaowei.bao@nxp.com>
 L:	linux-pci@vger.kernel.org
 L:	linux-arm-kernel@lists.infradead.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/pci/layerscape-pcie-gen4.txt
 F:	drivers/pci/controller/mobibeil/pcie-layerscape-gen4.c
+F:	drivers/pci/controller/mobiveil/pcie-layerscape-gen4-ep.c
 
 PCI DRIVER FOR GENERIC OF HOSTS
 M:	Will Deacon <will@kernel.org>

drivers/pci/controller/mobiveil/Kconfig

@@ -27,13 +27,24 @@ config PCIE_MOBIVEIL_PLAT
 	  for address translation and it is a PCIe Gen4 IP.
 
 config PCIE_LAYERSCAPE_GEN4
-	bool "Freescale Layerscape PCIe Gen4 controller"
+	bool "Freescale Layerscpe PCIe Gen4 controller in RC mode"
 	depends on PCI
 	depends on OF && (ARM64 || ARCH_LAYERSCAPE)
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIE_MOBIVEIL_HOST
 	help
 	  Say Y here if you want PCIe Gen4 controller support on
-	  Layerscape SoCs. The PCIe controller can work in RC or
+	  Layerscape SoCs. And the PCIe controller work in RC mode
-	  EP mode according to RCW[HOST_AGT_PEX] setting.
+	  by setting the RCW[HOST_AGT_PEX] to 0.
+
+config PCIE_LAYERSCAPE_GEN4_EP
+	bool "Freescale Layerscpe PCIe Gen4 controller in EP mode"
+	depends on PCI
+	depends on OF && (ARM64 || ARCH_LAYERSCAPE)
+	depends on PCI_ENDPOINT
+	select PCIE_MOBIVEIL_EP
+	help
+	  Say Y here if you want PCIe Gen4 controller support on
+	  Layerscape SoCs. And the PCIe controller work in EP mode
+	  by setting the RCW[HOST_AGT_PEX] to 1.
 endmenu

drivers/pci/controller/mobiveil/Makefile

@@ -4,3 +4,4 @@ obj-$(CONFIG_PCIE_MOBIVEIL_HOST) += pcie-mobiveil-host.o
 obj-$(CONFIG_PCIE_MOBIVEIL_EP) += pcie-mobiveil-ep.o
 obj-$(CONFIG_PCIE_MOBIVEIL_PLAT) += pcie-mobiveil-plat.o
 obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4) += pcie-layerscape-gen4.o
+obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4_EP) += pcie-layerscape-gen4-ep.o

drivers/pci/controller/mobiveil/pcie-layerscape-gen4-ep.c

@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe controller EP driver for Freescale Layerscape SoCs
+ *
+ * Copyright 2019 NXP
+ *
+ * Author: Xiaowei Bao <xiaowei.bao@nxp.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+
+#include "pcie-mobiveil.h"
+
+#define PCIE_LX2_BAR_NUM	4
+
+#define to_ls_pcie_g4_ep(x)	dev_get_drvdata((x)->dev)
+
+struct ls_pcie_g4_ep {
+	struct mobiveil_pcie		*mv_pci;
+};
+
+static const struct of_device_id ls_pcie_g4_ep_of_match[] = {
+	{ .compatible = "fsl,lx2160a-pcie-ep",},
+	{ },
+};
+
+static const struct pci_epc_features ls_pcie_g4_epc_features = {
+	.linkup_notifier = false,
+	.msi_capable = true,
+	.msix_capable = true,
+	.reserved_bar = (1 << BAR_4) | (1 << BAR_5),
+};
+
+static const struct pci_epc_features*
+ls_pcie_g4_ep_get_features(struct mobiveil_pcie_ep *ep)
+{
+	return &ls_pcie_g4_epc_features;
+}
+
+static void ls_pcie_g4_ep_init(struct mobiveil_pcie_ep *ep)
+{
+	struct mobiveil_pcie *mv_pci = to_mobiveil_pcie_from_ep(ep);
+	int win_idx;
+	u8 bar;
+
+	ep->bar_num = PCIE_LX2_BAR_NUM;
+
+	for (bar = BAR_0; bar < ep->epc->max_functions * ep->bar_num; bar++)
+		mobiveil_pcie_ep_reset_bar(mv_pci, bar);
+
+	for (win_idx = 0; win_idx < ep->apio_wins; win_idx++)
+		mobiveil_pcie_disable_ob_win(mv_pci, win_idx);
+}
+
+static int ls_pcie_g4_ep_raise_irq(struct mobiveil_pcie_ep *ep, u8 func_no,
+				   enum pci_epc_irq_type type,
+				   u16 interrupt_num)
+{
+	struct mobiveil_pcie *mv_pci = to_mobiveil_pcie_from_ep(ep);
+
+	switch (type) {
+	case PCI_EPC_IRQ_LEGACY:
+		return mobiveil_pcie_ep_raise_legacy_irq(ep, func_no);
+	case PCI_EPC_IRQ_MSI:
+		return mobiveil_pcie_ep_raise_msi_irq(ep, func_no,
+						      interrupt_num);
+	case PCI_EPC_IRQ_MSIX:
+		return mobiveil_pcie_ep_raise_msix_irq(ep, func_no,
+						       interrupt_num);
+	default:
+		dev_err(&mv_pci->pdev->dev, "UNKNOWN IRQ type\n");
+	}
+
+	return 0;
+}
+
+static const struct mobiveil_pcie_ep_ops pcie_ep_ops = {
+	.ep_init = ls_pcie_g4_ep_init,
+	.raise_irq = ls_pcie_g4_ep_raise_irq,
+	.get_features = ls_pcie_g4_ep_get_features,
+};
+
+static int __init ls_pcie_gen4_add_pcie_ep(struct ls_pcie_g4_ep *ls_ep,
+					   struct platform_device *pdev)
+{
+	struct mobiveil_pcie *mv_pci = ls_ep->mv_pci;
+	struct device *dev = &pdev->dev;
+	struct mobiveil_pcie_ep *ep;
+	struct resource *res;
+	int ret;
+
+	ep = &mv_pci->ep;
+	ep->ops = &pcie_ep_ops;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
+	if (!res)
+		return -EINVAL;
+
+	ep->phys_base = res->start;
+	ep->addr_size = resource_size(res);
+
+	ret = mobiveil_pcie_ep_init(ep);
+	if (ret) {
+		dev_err(dev, "failed to initialize layerscape endpoint\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __init ls_pcie_g4_ep_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mobiveil_pcie *mv_pci;
+	struct ls_pcie_g4_ep *ls_ep;
+	struct resource *res;
+	int ret;
+
+	ls_ep = devm_kzalloc(dev, sizeof(*ls_ep), GFP_KERNEL);
+	if (!ls_ep)
+		return -ENOMEM;
+
+	mv_pci = devm_kzalloc(dev, sizeof(*mv_pci), GFP_KERNEL);
+	if (!mv_pci)
+		return -ENOMEM;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+	mv_pci->csr_axi_slave_base = devm_pci_remap_cfg_resource(dev, res);
+	if (IS_ERR(mv_pci->csr_axi_slave_base))
+		return PTR_ERR(mv_pci->csr_axi_slave_base);
+
+	mv_pci->pdev = pdev;
+	ls_ep->mv_pci = mv_pci;
+
+	platform_set_drvdata(pdev, ls_ep);
+
+	ret = ls_pcie_gen4_add_pcie_ep(ls_ep, pdev);
+
+	return ret;
+}
+
+static struct platform_driver ls_pcie_g4_ep_driver = {
+	.driver = {
+		.name = "layerscape-pcie-gen4-ep",
+		.of_match_table = ls_pcie_g4_ep_of_match,
+		.suppress_bind_attrs = true,
+	},
+};
+builtin_platform_driver_probe(ls_pcie_g4_ep_driver, ls_pcie_g4_ep_probe);