On Wed, May 10, 2023 at 03:22:32PM +0900, Yoshihiro Shimoda wrote:
> 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 | 166 ++++++++++++++++++
> 3 files changed, 177 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 64d4d37bc891..4d877cd18374 100644
> --- a/drivers/pci/controller/dwc/Kconfig
> +++ b/drivers/pci/controller/dwc/Kconfig
> @@ -424,4 +424,13 @@ 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..710bbc9e61a5
> --- /dev/null
> +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4-ep.c
> @@ -0,0 +1,166 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * PCIe Endpoint driver for Renesas R-Car Gen4 Series SoCs
> + * Copyright (C) 2022-2023 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"
> +
> +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);
> + u8 val;
> +
> + rcar_gen4_pcie_set_device_type(rcar, false, dw->num_lanes);
> +
> + dw_pcie_dbi_ro_wr_en(dw);
> +
> + /* Single function */
> + val = dw_pcie_readb_dbi(dw, PCI_HEADER_TYPE);
> + val &= ~PCI_HEADER_TYPE_MULTI_FUNC;
> + dw_pcie_writeb_dbi(dw, PCI_HEADER_TYPE, val);
Just wondering. Did you try to implement the multi-function-ness
support? It don't seem to be much problematic (implementing
func_conf_select() callback and possibly some trick to distinguish dbi
and dbi2 spaces).
BTW based on your End-point DT-bindings the "max-functions" property
is permitted to have value 2. Thus your platforms may have both functions
activated and exposed to user-space meanwhile your driver doesn't seem
to support it...
-Serge(y)
> +
> + dw_pcie_dbi_ro_wr_dis(dw);
> +
> + writel(PCIEDMAINTSTSEN_INIT, rcar->base + PCIEDMAINTSTSEN);
> +}
> +
> +static void rcar_gen4_pcie_ep_deinit(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);
> +
> + writel(0, rcar->base + PCIEDMAINTSTSEN);
> +}
> +
> +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_INTX:
> + return dw_pcie_ep_raise_intx_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,
> + .reserved_bar = 1 << BAR_5,
> + .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,
> + .ep_deinit = rcar_gen4_pcie_ep_deinit,
> + .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_ep *ep = &rcar->dw.ep;
> + int ret;
> +
> + ep->ops = &pcie_ep_ops;
> +
> + ret = dw_pcie_ep_init(ep);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to initialize endpoint\n");
> + return ret;
> + }
> +
> + 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_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_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
>
