Hi Manivannan,
> From: Manivannan Sadhasivam, Sent: Saturday, April 22, 2023 11:47 PM
>
> On Tue, Apr 18, 2023 at 09:24:01PM +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>
>
> Small nit below...
>
> > ---
> > 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 eb90e2116e59..1b60cade8a20 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..eb4b29c948d5
> > --- /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);
> > +
> > + 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");
>
> Unknown
I got it. I'll fix it on v13.
> > + 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;
> > + }
>
> No need to assert/deassert reset?
I assumed no need to assert reset, and deasserting will be issued on
rcar_gen4_pcie_set_device_type() from rcar_gen4_pcie_ep_pre_init().
Best regards,
Yoshihiro Shimoda
> - Mani
>
> --
> மணிவண்ணன் சதாசிவம்
