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Message-ID: <0791e307-17c5-6f47-ae89-73bb5dc0f232@ti.com>
Date: Mon, 21 Jan 2019 16:31:00 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Xiaowei Bao <xiaowei.bao@....com>, <bhelgaas@...gle.com>,
<robh+dt@...nel.org>, <mark.rutland@....com>,
<shawnguo@...nel.org>, <leoyang.li@....com>,
<lorenzo.pieralisi@....com>, <arnd@...db.de>,
<gregkh@...uxfoundation.org>, <minghuan.Lian@....com>,
<mingkai.hu@....com>, <roy.zang@....com>,
<kstewart@...uxfoundation.org>,
<cyrille.pitchen@...e-electrons.com>, <pombredanne@...b.com>,
<shawn.lin@...k-chips.com>, <niklas.cassel@...s.com>,
<linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCHv5 3/4] pci: layerscape: Add the EP mode support.
Hi Xiaowei,
On 21/01/19 3:14 PM, Xiaowei Bao wrote:
> Add the PCIe EP mode support for layerscape platform.
>
> Signed-off-by: Xiaowei Bao <xiaowei.bao@....com>
> Reviewed-by: Minghuan Lian <minghuan.lian@....com>
> Reviewed-by: Zhiqiang Hou <zhiqiang.hou@....com>
This patch looks good to me, except for using epc->features which I've tried to
get rid of in [1]. After Lorenzo's review, one of us have to change it to the
new design.
Thanks
Kishon
[1] -> https://patchwork.kernel.org/project/linux-pci/list/?series=66177
> ---
> v2:
> - remove the EP mode check function.
> v3:
> - modif the return value when enter default case.
> v4:
> - no change.
> v5:
> - no change.
>
> drivers/pci/controller/dwc/Makefile | 2 +-
> drivers/pci/controller/dwc/pci-layerscape-ep.c | 146 ++++++++++++++++++++++++
> 2 files changed, 147 insertions(+), 1 deletions(-)
> create mode 100644 drivers/pci/controller/dwc/pci-layerscape-ep.c
>
> diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
> index 7bcdcdf..b5f3b83 100644
> --- a/drivers/pci/controller/dwc/Makefile
> +++ b/drivers/pci/controller/dwc/Makefile
> @@ -8,7 +8,7 @@ obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
> obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
> obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
> obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone.o
> -obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
> +obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o pci-layerscape-ep.o
> obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
> obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
> obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
> diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> new file mode 100644
> index 0000000..dafb528
> --- /dev/null
> +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> @@ -0,0 +1,146 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe controller EP driver for Freescale Layerscape SoCs
> + *
> + * Copyright (C) 2018 NXP Semiconductor.
> + *
> + * Author: Xiaowei Bao <xiaowei.bao@....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-designware.h"
> +
> +#define PCIE_DBI2_OFFSET 0x1000 /* DBI2 base address*/
> +
> +struct ls_pcie_ep {
> + struct dw_pcie *pci;
> +};
> +
> +#define to_ls_pcie_ep(x) dev_get_drvdata((x)->dev)
> +
> +static int ls_pcie_establish_link(struct dw_pcie *pci)
> +{
> + return 0;
> +}
> +
> +static const struct dw_pcie_ops ls_pcie_ep_ops = {
> + .start_link = ls_pcie_establish_link,
> +};
> +
> +static const struct of_device_id ls_pcie_ep_of_match[] = {
> + { .compatible = "fsl,ls-pcie-ep",},
> + { },
> +};
> +
> +static void ls_pcie_ep_init(struct dw_pcie_ep *ep)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> + struct pci_epc *epc = ep->epc;
> + enum pci_barno bar;
> +
> + for (bar = BAR_0; bar <= BAR_5; bar++)
> + dw_pcie_ep_reset_bar(pci, bar);
> +
> + epc->features |= EPC_FEATURE_NO_LINKUP_NOTIFIER;
> +}
> +
> +static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
> + enum pci_epc_irq_type type, u16 interrupt_num)
> +{
> + struct dw_pcie *pci = 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);
> + case PCI_EPC_IRQ_MSIX:
> + return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
> + default:
> + dev_err(pci->dev, "UNKNOWN IRQ type\n");
> + return -EINVAL;
> + }
> +}
> +
> +static struct dw_pcie_ep_ops pcie_ep_ops = {
> + .ep_init = ls_pcie_ep_init,
> + .raise_irq = ls_pcie_ep_raise_irq,
> +};
> +
> +static int __init ls_add_pcie_ep(struct ls_pcie_ep *pcie,
> + struct platform_device *pdev)
> +{
> + struct dw_pcie *pci = pcie->pci;
> + struct device *dev = pci->dev;
> + struct dw_pcie_ep *ep;
> + struct resource *res;
> + int ret;
> +
> + ep = &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 = dw_pcie_ep_init(ep);
> + if (ret) {
> + dev_err(dev, "failed to initialize endpoint\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int __init ls_pcie_ep_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct dw_pcie *pci;
> + struct ls_pcie_ep *pcie;
> + struct resource *dbi_base;
> + int ret;
> +
> + pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
> + if (!pcie)
> + return -ENOMEM;
> +
> + pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
> + if (!pci)
> + return -ENOMEM;
> +
> + dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
> + pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
> + if (IS_ERR(pci->dbi_base))
> + return PTR_ERR(pci->dbi_base);
> +
> + pci->dbi_base2 = pci->dbi_base + PCIE_DBI2_OFFSET;
> + pci->dev = dev;
> + pci->ops = &ls_pcie_ep_ops;
> + pcie->pci = pci;
> +
> + platform_set_drvdata(pdev, pcie);
> +
> + ret = ls_add_pcie_ep(pcie, pdev);
> +
> + return ret;
> +}
> +
> +static struct platform_driver ls_pcie_ep_driver = {
> + .driver = {
> + .name = "layerscape-pcie-ep",
> + .of_match_table = ls_pcie_ep_of_match,
> + .suppress_bind_attrs = true,
> + },
> +};
> +builtin_platform_driver_probe(ls_pcie_ep_driver, ls_pcie_ep_probe);
>
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