linux-kernel - Re: [PATCH] pci: exynos: split into two parts such as Synopsys part and Exynos part

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Date:	Fri, 5 Jul 2013 16:14:00 +0530
From:	Pratyush Anand <pratyush.anand@...com>
To:	Jingoo Han <jg1.han@...sung.com>, Mohit KUMAR <Mohit.KUMAR@...com>
Cc:	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Arnd Bergmann' <arnd@...db.de>,
	'Sean Cross' <xobs@...agi.com>,
	'SRIKANTH TUMKUR SHIVANAND' <ts.srikanth@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pci: exynos: split into two parts such as Synopsys part
 and Exynos part

On 7/5/2013 1:59 PM, Jingoo Han wrote:
> Exynos PCIe IP consists of Synopsys specific part and Exynos
> specific part. Only core block is a Synopsys designware part;
> other parts are Exynos specific.
> Also, the Synopsys designware part can be shared with other
> platforms; thus, it can be split two parts such as Synopsys
> designware part and Exynos specific part.
>

A quick and nice job :)
Just few minor comments.

> Signed-off-by: Jingoo Han <jg1.han@...sung.com>
> Cc: Pratyush Anand <pratyush.anand@...com>
> Cc: Mohit KUMAR <Mohit.KUMAR@...com>
> ---
>   drivers/pci/host/Makefile          |    1 +
>   drivers/pci/host/pcie-designware.c |  907 +++++++-----------------------------
>   drivers/pci/host/pcie-designware.h |   72 +++
>   drivers/pci/host/pcie-exynos.c     |  619 ++++++++++++++++++++++++
>   4 files changed, 862 insertions(+), 737 deletions(-)
>   create mode 100644 drivers/pci/host/pcie-designware.h
>   create mode 100644 drivers/pci/host/pcie-exynos.c
>

[...]


> -
> -struct pcie_port {
> -       struct device           *dev;
> -       u8                      controller;
> -       u8                      root_bus_nr;
> -       void __iomem            *dbi_base;
> -       void __iomem            *elbi_base;
> -       void __iomem            *phy_base;
> -       void __iomem            *purple_base;

Just for knowledge, what is the purple_base. It might not be needed by 
all vendors. Can we explain the name in comment or can give some generic 
name?

> -       u64                     cfg0_base;
> -       void __iomem            *va_cfg0_base;
> -       u64                     cfg1_base;
> -       void __iomem            *va_cfg1_base;
> -       u64                     io_base;
> -       u64                     mem_base;
> -       spinlock_t              conf_lock;
> -       struct resource         cfg;
> -       struct resource         io;
> -       struct resource         mem;
> -       struct pcie_port_info   config;
> -       struct clk              *clk;
> -       struct clk              *bus_clk;
> -       int                     irq;
> -       int                     reset_gpio;
> -};
> -

[...]

> -
> -static inline void readl_rc(struct pcie_port *pp, void *dbi_base, u32 *val)
> +static inline void dw_pcie_readl_rc(struct pcie_port *pp, void *dbi_base,
> +                               u32 *val)

dbi_base is part of pp. So why to pass 3 args?

>   {
> -       exynos_pcie_sideband_dbi_r_mode(pp, true);
> -       *val = readl(dbi_base);
> -       exynos_pcie_sideband_dbi_r_mode(pp, false);
> -       return;
> +       if (pp->ops->readl_rc)
> +               pp->ops->readl_rc(pp, dbi_base, val);

ditto

> +       else
> +               *val = readl(dbi_base);
>   }
>
> -static inline void writel_rc(struct pcie_port *pp, u32 val, void *dbi_base)
> +static inline void dw_pcie_writel_rc(struct pcie_port *pp, u32 val,
> +                               void *dbi_base)

ditto

>   {
> -       exynos_pcie_sideband_dbi_w_mode(pp, true);
> -       writel(val, dbi_base);
> -       exynos_pcie_sideband_dbi_w_mode(pp, false);
> -       return;
> +       if (pp->ops->writel_rc)
> +               pp->ops->writel_rc(pp, val, dbi_base);

ditto

> +       else
> +               writel(val, dbi_base);
>   }


Regards
Pratyush
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