Add R-Car Gen4 PCIe Endpoint support. This controller is based on
Synopsys DesignWare PCIe.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
drivers/pci/controller/dwc/Kconfig | 9 +
drivers/pci/controller/dwc/Makefile | 2 +
.../pci/controller/dwc/pcie-rcar-gen4-ep.c | 182 ++++++++++++++++++
3 files changed, 193 insertions(+)
create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4-ep.c
diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index 99717b0f4e50..4889bde3471b 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -402,4 +402,13 @@ config PCIE_RCAR_GEN4
Say Y here if you want PCIe host controller support on R-Car Gen4 SoCs.
This uses the DesignWare core.
+config PCIE_RCAR_GEN4_EP
+ tristate "Renesas R-Car Gen4 PCIe Endpoint controller"
+ depends on ARCH_RENESAS || COMPILE_TEST
+ depends on PCI_ENDPOINT
+ select PCIE_DW_EP
+ help
+ Say Y here if you want PCIe endpoint controller support on R-Car Gen4
+ SoCs. This uses the DesignWare core.
+
endmenu
diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
index 486cf706b53d..0fb0bde26ac4 100644
--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile
@@ -28,6 +28,8 @@ obj-$(CONFIG_PCIE_UNIPHIER_EP) += pcie-uniphier-ep.o
obj-$(CONFIG_PCIE_VISCONTI_HOST) += pcie-visconti.o
pcie-rcar-gen4-host-drv-objs := pcie-rcar-gen4.o pcie-rcar-gen4-host.o
obj-$(CONFIG_PCIE_RCAR_GEN4) += pcie-rcar-gen4-host-drv.o
+pcie-rcar-gen4-ep-drv-objs := pcie-rcar-gen4.o pcie-rcar-gen4-ep.o
+obj-$(CONFIG_PCIE_RCAR_GEN4_EP) += pcie-rcar-gen4-ep-drv.o
# The following drivers are for devices that use the generic ACPI
# pci_root.c driver but don't support standard ECAM config access.
diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4-ep.c b/drivers/pci/controller/dwc/pcie-rcar-gen4-ep.c
new file mode 100644
index 000000000000..79677cf40ebf
--- /dev/null
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4-ep.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe Endpoint driver for Renesas R-Car Gen4 Series SoCs
+ * Copyright (C) 2022 Renesas Electronics Corporation
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+
+#include "pcie-rcar-gen4.h"
+#include "pcie-designware.h"
+
+/* Configuration */
+#define PCICONF3 0x000c
+#define MULTI_FUNC BIT(23)
+
+static void rcar_gen4_pcie_ep_pre_init(struct dw_pcie_ep *ep)
+{
+ struct dw_pcie *dw = to_dw_pcie_from_ep(ep);
+ struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
+ int val;
+
+ rcar_gen4_pcie_set_device_type(rcar, false, dw->num_lanes);
+
+ dw_pcie_dbi_ro_wr_en(dw);
+
+ /* Single function */
+ val = dw_pcie_readl_dbi(dw, PCICONF3);
+ val &= ~MULTI_FUNC;
+ dw_pcie_writel_dbi(dw, PCICONF3, val);
+
+ rcar_gen4_pcie_disable_bar(dw, BAR2MASKF);
+ rcar_gen4_pcie_disable_bar(dw, BAR3MASKF);
+
+ rcar_gen4_pcie_set_max_link_width(dw, dw->num_lanes);
+
+ dw_pcie_dbi_ro_wr_dis(dw);
+}
+
+static int rcar_gen4_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
+ enum pci_epc_irq_type type,
+ u16 interrupt_num)
+{
+ struct dw_pcie *dw = to_dw_pcie_from_ep(ep);
+
+ switch (type) {
+ case PCI_EPC_IRQ_LEGACY:
+ return dw_pcie_ep_raise_legacy_irq(ep, func_no);
+ case PCI_EPC_IRQ_MSI:
+ return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
+ default:
+ dev_err(dw->dev, "UNKNOWN IRQ type\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
+ .linkup_notifier = false,
+ .msi_capable = true,
+ .msix_capable = false,
+ .align = SZ_1M,
+};
+
+static const struct pci_epc_features*
+rcar_gen4_pcie_ep_get_features(struct dw_pcie_ep *ep)
+{
+ return &rcar_gen4_pcie_epc_features;
+}
+
+static const struct dw_pcie_ep_ops pcie_ep_ops = {
+ .ep_pre_init = rcar_gen4_pcie_ep_pre_init,
+ .raise_irq = rcar_gen4_pcie_ep_raise_irq,
+ .get_features = rcar_gen4_pcie_ep_get_features,
+};
+
+static int rcar_gen4_add_pcie_ep(struct rcar_gen4_pcie *rcar,
+ struct platform_device *pdev)
+{
+ struct dw_pcie *dw = &rcar->dw;
+ struct dw_pcie_ep *ep;
+ int ret;
+
+ ep = &dw->ep;
+ ep->ops = &pcie_ep_ops;
+ ep->reset_all_bars = true;
+
+ ret = dw_pcie_ep_init(ep);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to initialize endpoint\n");
+ return ret;
+ }
+
+ dw->ops->start_link(dw);
+
+ return 0;
+}
+
+static void rcar_gen4_remove_pcie_ep(struct rcar_gen4_pcie *rcar)
+{
+ dw_pcie_ep_exit(&rcar->dw.ep);
+}
+
+static int rcar_gen4_pcie_ep_get_resources(struct rcar_gen4_pcie *rcar,
+ struct platform_device *pdev)
+{
+ struct dw_pcie *dw = &rcar->dw;
+ struct device *dev = dw->dev;
+
+ /* Renesas-specific registers */
+ rcar->base = devm_platform_ioremap_resource_byname(pdev, "appl");
+ if (IS_ERR(rcar->base))
+ return PTR_ERR(rcar->base);
+
+ return rcar_gen4_pcie_devm_reset_get(rcar, dev);
+}
+
+static int rcar_gen4_pcie_ep_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rcar_gen4_pcie *rcar;
+ int err;
+
+ rcar = rcar_gen4_pcie_devm_alloc(dev);
+ if (!rcar)
+ return -ENOMEM;
+
+ err = rcar_gen4_pcie_ep_get_resources(rcar, pdev);
+ if (err < 0) {
+ dev_err(dev, "failed to request resource: %d\n", err);
+ return err;
+ }
+
+ platform_set_drvdata(pdev, rcar);
+
+ err = rcar_gen4_pcie_prepare(rcar);
+ if (err < 0)
+ return err;
+
+ err = rcar_gen4_add_pcie_ep(rcar, pdev);
+ if (err < 0)
+ goto err_add;
+
+ return 0;
+
+err_add:
+ rcar_gen4_pcie_unprepare(rcar);
+
+ return err;
+}
+
+static int rcar_gen4_pcie_ep_remove(struct platform_device *pdev)
+{
+ struct rcar_gen4_pcie *rcar = platform_get_drvdata(pdev);
+
+ rcar_gen4_remove_pcie_ep(rcar);
+ rcar_gen4_pcie_unprepare(rcar);
+
+ return 0;
+}
+
+static const struct of_device_id rcar_gen4_pcie_of_match[] = {
+ { .compatible = "renesas,rcar-gen4-pcie-ep", },
+ {},
+};
+
+static struct platform_driver rcar_gen4_pcie_ep_driver = {
+ .driver = {
+ .name = "pcie-rcar-gen4-ep",
+ .of_match_table = rcar_gen4_pcie_of_match,
+ },
+ .probe = rcar_gen4_pcie_ep_probe,
+ .remove = rcar_gen4_pcie_ep_remove,
+};
+module_platform_driver(rcar_gen4_pcie_ep_driver);
+
+MODULE_DESCRIPTION("Renesas R-Car Gen4 PCIe endpoint controller driver");
+MODULE_LICENSE("GPL");
--
2.25.1
