linux-kernel - Re: [PATCH] PCI: altera: Allow building as module

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Message-ID: <CAFiDJ5-4vquVtrqpjgk8D6yhng3RFHN6dF4Kh_PGYe_doZtvqw@mail.gmail.com>
Date:   Tue, 14 May 2019 13:35:05 +0800
From:   Ley Foon Tan <lftan.linux@...il.com>
To:     Ley Foon Tan <ley.foon.tan@...el.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-kernel@...r.kernel.org,
        linux-pci <linux-pci@...r.kernel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH] PCI: altera: Allow building as module

On Wed, Apr 24, 2019 at 12:57 PM Ley Foon Tan <ley.foon.tan@...el.com> wrote:
>
> Altera PCIe Rootport IP is a soft IP and is only available after
> FPGA image is programmed.
>
> Make driver modulable to support use case FPGA image is programmed
> after kernel is booted. User proram FPGA image in kernel then only load
> PCIe driver module.
>
> Signed-off-by: Ley Foon Tan <ley.foon.tan@...el.com>
> ---
>  drivers/pci/controller/Kconfig       |  2 +-
>  drivers/pci/controller/pcie-altera.c | 28 ++++++++++++++++++++++++++--
>  2 files changed, 27 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
> index 6012f3059acd..4b550f9cdd56 100644
> --- a/drivers/pci/controller/Kconfig
> +++ b/drivers/pci/controller/Kconfig
> @@ -174,7 +174,7 @@ config PCIE_IPROC_MSI
>           PCIe controller
>
>  config PCIE_ALTERA
> -       bool "Altera PCIe controller"
> +       tristate "Altera PCIe controller"
>         depends on ARM || NIOS2 || ARM64 || COMPILE_TEST
>         help
>           Say Y here if you want to enable PCIe controller support on Altera
> diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
> index 27edcebd1726..6c86bc69ace8 100644
> --- a/drivers/pci/controller/pcie-altera.c
> +++ b/drivers/pci/controller/pcie-altera.c
> @@ -10,6 +10,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/irqchip/chained_irq.h>
>  #include <linux/init.h>
> +#include <linux/module.h>
>  #include <linux/of_address.h>
>  #include <linux/of_device.h>
>  #include <linux/of_irq.h>
> @@ -705,6 +706,13 @@ static int altera_pcie_init_irq_domain(struct altera_pcie *pcie)
>         return 0;
>  }
>
> +static int altera_pcie_irq_teardown(struct altera_pcie *pcie)
> +{
> +       irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
> +       irq_domain_remove(pcie->irq_domain);
> +       irq_dispose_mapping(pcie->irq);
> +}
> +
>  static int altera_pcie_parse_dt(struct altera_pcie *pcie)
>  {
>         struct device *dev = &pcie->pdev->dev;
> @@ -798,6 +806,7 @@ static int altera_pcie_probe(struct platform_device *pdev)
>
>         pcie = pci_host_bridge_priv(bridge);
>         pcie->pdev = pdev;
> +       platform_set_drvdata(pdev, pcie);
>
>         match = of_match_device(altera_pcie_of_match, &pdev->dev);
>         if (!match)
> @@ -855,13 +864,28 @@ static int altera_pcie_probe(struct platform_device *pdev)
>         return ret;
>  }
>
> +static int altera_pcie_remove(struct platform_device *pdev)
> +{
> +       struct altera_pcie *pcie = platform_get_drvdata(pdev);
> +       struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
> +
> +       pci_stop_root_bus(bridge->bus);
> +       pci_remove_root_bus(bridge->bus);
> +       pci_free_resource_list(&pcie->resources);
> +       altera_pcie_irq_teardown(pcie);
> +
> +       return 0;
> +}
> +
>  static struct platform_driver altera_pcie_driver = {
>         .probe          = altera_pcie_probe,
> +       .remove         = altera_pcie_remove,
>         .driver = {
>                 .name   = "altera-pcie",
>                 .of_match_table = altera_pcie_of_match,
> -               .suppress_bind_attrs = true,
>         },
>  };
>
> -builtin_platform_driver(altera_pcie_driver);
> +MODULE_DEVICE_TABLE(of, altera_pcie_of_match);
> +module_platform_driver(altera_pcie_driver);
> +MODULE_LICENSE("GPL v2");
> --
> 2.19.0
>
Hi

Any comment for this patch?

Regards
Ley Foon