linux-kernel - Re: [PATCH v4 0/6] Add Keystone PCIe controller driver

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Date:	Mon, 14 Jul 2014 21:23:28 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Pratyush Anand' <pratyush.anand@...com>,
	'Murali Karicheri' <m-karicheri2@...com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	'Russell King' <linux@....linux.org.uk>,
	'Grant Likely' <grant.likely@...aro.org>,
	'Rob Herring' <robh+dt@...nel.org>,
	'Mohit KUMAR DCG' <Mohit.KUMAR@...com>,
	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	'Richard Zhu' <r65037@...escale.com>,
	'Kishon Vijay Abraham I' <kishon@...com>,
	'Marek Vasut' <marex@...x.de>, 'Arnd Bergmann' <arnd@...db.de>,
	'Pawel Moll' <pawel.moll@....com>,
	'Mark Rutland' <mark.rutland@....com>,
	'Ian Campbell' <ijc+devicetree@...lion.org.uk>,
	'Kumar Gala' <galak@...eaurora.org>,
	'Randy Dunlap' <rdunlap@...radead.org>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v4 0/6] Add Keystone PCIe controller driver

On Monday, July 14, 2014 3:04 PM, Pratyush Anand wrote:
> On Sat, Jul 12, 2014 at 04:36:29AM +0800, Murali Karicheri wrote:
> 
> [...]
> 
> > Murali Karicheri (6):
> >   PCI: designware: add rd[wr]_other_conf API
> >   PCI: designware: refactor MSI code to work with v3.65 dw hardware
> 
> For  above two you can add my reviewed-by:
> 
> >   PCI: designware: refactor host init code to re-use on keystone PCI
> >   PCI: designware: enhance dw core driver to support keystone PCI host
> 
> In stead of using version number and then changing few functions from
> static to global , I would have used same philosophy of adding callbacks
> wherever needed. May be maintainers can give their view, instead of patch
> 3 and 4 I would have gone with something like this, where kc_pcie can be
> passed through pp->plat_data.

I agree with your suggestion. I don't want to use the version number.
The call back would be better.

Best regards,
Jingoo Han

> 
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 905941c..b216192 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -490,16 +490,21 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
>         }
> 
>         if (IS_ENABLED(CONFIG_PCI_MSI)) {
> -               pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
> -                                       MAX_MSI_IRQS, &msi_domain_ops,
> -                                       &dw_pcie_msi_chip);
> -               if (!pp->irq_domain) {
> -                       dev_err(pp->dev, "irq domain init failed\n");
> -                       return -ENXIO;
> -               }
> +               if (!pp->ops->msi_init) {
> +                       pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
> +                                               MAX_MSI_IRQS, &msi_domain_ops,
> +                                               &dw_pcie_msi_chip);
> +                       if (!pp->irq_domain) {
> +                               dev_err(pp->dev, "irq domain init failed\n");
> +                               return -ENXIO;
> +                       }
> 
> -               for (i = 0; i < MAX_MSI_IRQS; i++)
> -                       irq_create_mapping(pp->irq_domain, i);
> +                       for (i = 0; i < MAX_MSI_IRQS; i++)
> +                               irq_create_mapping(pp->irq_domain, i);
> +               } else {
> +                       pp->ops->msi_init(pp, &msi_domain_ops,
> +                                               &dw_pcie_msi_chip);
> +               }
>         }
> 
>         if (pp->ops->host_init)
> @@ -759,6 +764,9 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
>                 BUG();
>         }
> 
> +       if (bus && pp->ops->scan_bus)
> +               bus = pp->ops->scan_bus(pp);
> +
>         return bus;
>  }
> 
> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
> index 387f69e..39ce496 100644
> --- a/drivers/pci/host/pcie-designware.h
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -52,6 +52,7 @@ struct pcie_port {
>         struct irq_domain       *irq_domain;
>         unsigned long           msi_data;
>         DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
> +       void                    *plat_data;
>  };
> 
>  struct pcie_host_ops {
> @@ -70,6 +71,9 @@ struct pcie_host_ops {
>         void (*msi_set_irq)(struct pcie_port *pp, int irq);
>         void (*msi_clear_irq)(struct pcie_port *pp, int irq);
>         u32 (*get_msi_data)(struct pcie_port *pp);
> +       struct pci_bus *(*scan_bus)(struct pcie_port *pp);
> +       void (*msi_init) (struct pcie_port *pp, struct irq_domain_ops *ops,
> +                       struct msi_chip *chip);
>  };
> 
>  int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
> 
> 
> ~Pratyush

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