[PATCH 3/6] PCI: mobiveil: Add PCIe Gen4 EP driver for NXP Layerscape SoCs

[Xiaowei Bao]

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@xxxxxxx>
---
depends on: http://patchwork.ozlabs.org/project/linux-pci/list/?series=88754

 drivers/pci/controller/mobiveil/Kconfig            |   17 ++-
 drivers/pci/controller/mobiveil/Makefile           |    1 +
 .../controller/mobiveil/pci-layerscape-gen4-ep.c   |  166 ++++++++++++++++++++
 3 files changed, 181 insertions(+), 3 deletions(-)
 create mode 100644 drivers/pci/controller/mobiveil/pci-layerscape-gen4-ep.c

diff --git a/drivers/pci/controller/mobiveil/Kconfig b/drivers/pci/controller/mobiveil/Kconfig
index c037db6..16ee617 100644
--- a/drivers/pci/controller/mobiveil/Kconfig
+++ b/drivers/pci/controller/mobiveil/Kconfig
@@ -27,13 +27,24 @@ config PCIE_MOBIVEIL_PLAT
 	  for address translation and it is a PCIe Gen4 IP.
 
 config PCI_LAYERSCAPE_GEN4
-	bool "Freescale Layerscpe 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
-	  EP mode according to RCW[HOST_AGT_PEX] setting.
+	  Layerscape SoCs. And the PCIe controller work in RC mode
+	  by setting the RCW[HOST_AGT_PEX] to 0.
+
+config PCI_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
diff --git a/drivers/pci/controller/mobiveil/Makefile b/drivers/pci/controller/mobiveil/Makefile
index 4f520b7..cd907a7 100644
--- a/drivers/pci/controller/mobiveil/Makefile
+++ b/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_PCI_LAYERSCAPE_GEN4) += pci-layerscape-gen4.o
+obj-$(CONFIG_PCI_LAYERSCAPE_GEN4_EP) += pci-layerscape-gen4-ep.o
diff --git a/drivers/pci/controller/mobiveil/pci-layerscape-gen4-ep.c b/drivers/pci/controller/mobiveil/pci-layerscape-gen4-ep.c
new file mode 100644
index 0000000..dc3589d
--- /dev/null
+++ b/drivers/pci/controller/mobiveil/pci-layerscape-gen4-ep.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe controller EP driver for Freescale Layerscape SoCs
+ *
+ * Copyright (C) 2018 NXP Semiconductor.
+ *
+ * Author: Xiaowei Bao <xiaowei.bao@xxxxxxx>
+ */
+
+#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"
+
+struct ls_pcie_g4_ep {
+	struct mobiveil_pcie		*mv_pci;
+};
+
+#define to_ls_pcie_g4_ep(x)	dev_get_drvdata((x)->dev)
+
+static const struct of_device_id ls_pcie_g4_ep_of_match[] = {
+	{ .compatible = "fsl,lx2160a-pcie-ep",},
+	{ },
+};
+
+static void ls_pcie_g4_get_bar_num(struct mobiveil_pcie_ep *ep)
+{
+	struct mobiveil_pcie *mv_pci = to_mobiveil_pcie_from_ep(ep);
+	u32 type, reg;
+	u8 bar;
+
+	ep->bar_num = BAR_5 + 1;
+
+	for (bar = BAR_0; bar <= BAR_5; bar++) {
+		reg = PCI_BASE_ADDRESS_0 + (4 * bar);
+		type = csr_readl(mv_pci, reg) &
+		       PCI_BASE_ADDRESS_MEM_TYPE_MASK;
+		if (type & PCI_BASE_ADDRESS_MEM_TYPE_64)
+			ep->bar_num--;
+	}
+}
+
+static void ls_pcie_g4_ep_init(struct mobiveil_pcie_ep *ep)
+{
+	struct mobiveil_pcie *mv_pci = to_mobiveil_pcie_from_ep(ep);
+	struct pci_epc *epc = ep->epc;
+	enum pci_barno bar;
+	int win_idx;
+
+	ls_pcie_g4_get_bar_num(ep);
+
+	for (bar = BAR_0; bar < (ep->bar_num * ep->pf_num); bar++)
+		mobiveil_pcie_ep_reset_bar(mv_pci, bar);
+
+	for (win_idx = 0; win_idx < MAX_IATU_OUT; win_idx++)
+		mobiveil_pcie_disable_ob_win(mv_pci, win_idx);
+
+	epc->features |= EPC_FEATURE_NO_LINKUP_NOTIFIER;
+	epc->features |= EPC_FEATURE_MSIX_AVAILABLE;
+}
+
+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 struct mobiveil_pcie_ep_ops pcie_ep_ops = {
+	.ep_init = ls_pcie_g4_ep_init,
+	.raise_irq = ls_pcie_g4_ep_raise_irq,
+};
+
+static int __init ls_pcie_gen4_add_pcie_ep(struct ls_pcie_g4_ep *ls_pcie_g4_ep,
+					   struct platform_device *pdev)
+{
+	struct mobiveil_pcie *mv_pci = ls_pcie_g4_ep->mv_pci;
+	struct device *dev = &pdev->dev;
+	struct mobiveil_pcie_ep *ep;
+	struct resource *res;
+	int ret;
+	struct device_node *np = dev->of_node;
+
+	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 = of_property_read_u32(np, "max-functions", &ep->pf_num);
+	if (ret < 0)
+		ep->pf_num = 1;
+
+	ret = mobiveil_pcie_ep_init(ep);
+	if (ret) {
+		dev_err(dev, "failed to initialize 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_pcie_g4_ep;
+	struct resource *res;
+	int ret;
+
+	ls_pcie_g4_ep = devm_kzalloc(dev, sizeof(*ls_pcie_g4_ep), GFP_KERNEL);
+	if (!ls_pcie_g4_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_pcie_g4_ep->mv_pci = mv_pci;
+
+	platform_set_drvdata(pdev, ls_pcie_g4_ep);
+
+	ret = ls_pcie_gen4_add_pcie_ep(ls_pcie_g4_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);
-- 
1.7.1