linux-kernel - Re: [PATCH 01/04] PCI: rcar: Register each instance independently

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Date:	Wed, 5 Feb 2014 17:43:57 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:	linux-pci@...r.kernel.org, SH-Linux <linux-sh@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Valentine Barshak <valentine.barshak@...entembedded.com>,
	"Simon Horman [Horms]" <horms@...ge.net.au>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 01/04] PCI: rcar: Register each instance independently

On Wed, Feb 5, 2014 at 5:29 PM, Ben Dooks <ben.dooks@...ethink.co.uk> wrote:
> On 05/02/14 06:52, Magnus Damm wrote:
>>
>> From: Magnus Damm <damm@...nsource.se>
>>
>> Convert the code to allow per-device probe() like other device
>> drivers. This also delays driver registration due to change from
>> subsys_initcall() to regular module_platform_driver().
>>
>> Signed-off-by: Magnus Damm <damm@...nsource.se>
>> ---
>>
>>   drivers/pci/host/pci-rcar-gen2.c |   74
>> ++++++++------------------------------
>>   1 file changed, 16 insertions(+), 58 deletions(-)
>>
>> --- 0001/drivers/pci/host/pci-rcar-gen2.c
>> +++ work/drivers/pci/host/pci-rcar-gen2.c       2014-02-04
>> 16:38:46.000000000 +0900
>> @@ -74,9 +74,6 @@
>>
>>   #define RCAR_PCI_UNIT_REV_REG         (RCAR_AHBPCI_PCICOM_OFFSET + 0x48)
>>
>> -/* Number of internal PCI controllers */
>> -#define RCAR_PCI_NR_CONTROLLERS                3
>> -
>>   struct rcar_pci_priv {
>>         struct device *dev;
>>         void __iomem *reg;
>> @@ -228,6 +225,8 @@ static int __init rcar_pci_setup(int nr,
>>         pci_add_resource(&sys->resources, &priv->io_res);
>>         pci_add_resource(&sys->resources, &priv->mem_res);
>>
>> +       /* Setup bus number based on platform device id */
>> +       sys->busnr = to_platform_device(priv->dev)->id;
>>         return 1;
>>   }
>>
>> @@ -236,48 +235,12 @@ static struct pci_ops rcar_pci_ops = {
>>         .write  = rcar_pci_write_config,
>>   };
>>
>> -static struct hw_pci rcar_hw_pci __initdata = {
>> -       .map_irq        = rcar_pci_map_irq,
>> -       .ops            = &rcar_pci_ops,
>> -       .setup          = rcar_pci_setup,
>> -};
>> -
>> -static int rcar_pci_count __initdata;
>> -
>> -static int __init rcar_pci_add_controller(struct rcar_pci_priv *priv)
>> -{
>> -       void **private_data;
>> -       int count;
>> -
>> -       if (rcar_hw_pci.nr_controllers < rcar_pci_count)
>> -               goto add_priv;
>> -
>> -       /* (Re)allocate private data pointer array if needed */
>> -       count = rcar_pci_count + RCAR_PCI_NR_CONTROLLERS;
>> -       private_data = kzalloc(count * sizeof(void *), GFP_KERNEL);
>> -       if (!private_data)
>> -               return -ENOMEM;
>> -
>> -       rcar_pci_count = count;
>> -       if (rcar_hw_pci.private_data) {
>> -               memcpy(private_data, rcar_hw_pci.private_data,
>> -                      rcar_hw_pci.nr_controllers * sizeof(void *));
>> -               kfree(rcar_hw_pci.private_data);
>> -       }
>> -
>> -       rcar_hw_pci.private_data = private_data;
>> -
>> -add_priv:
>> -       /* Add private data pointer to the array */
>> -       rcar_hw_pci.private_data[rcar_hw_pci.nr_controllers++] = priv;
>> -       return 0;
>> -}
>> -
>> -static int __init rcar_pci_probe(struct platform_device *pdev)
>> +static int rcar_pci_probe(struct platform_device *pdev)
>>   {
>>         struct resource *cfg_res, *mem_res;
>>         struct rcar_pci_priv *priv;
>>         void __iomem *reg;
>> +       struct hw_pci hw;
>>
>>         cfg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>         reg = devm_ioremap_resource(&pdev->dev, cfg_res);
>> @@ -308,31 +271,26 @@ static int __init rcar_pci_probe(struct
>>         priv->reg = reg;
>>         priv->dev = &pdev->dev;
>>
>> -       return rcar_pci_add_controller(priv);
>> +       memset(&hw, 0, sizeof(hw));
>> +       hw.nr_controllers = 1;
>> +       hw.private_data = (void **)&priv;
>> +       hw.map_irq = rcar_pci_map_irq;
>> +       hw.ops = &rcar_pci_ops;
>> +       hw.setup = rcar_pci_setup;
>> +       pci_common_init_dev(&pdev->dev, &hw);
>> +       return 0;
>>   }
>
>
> Do we really want to explicitly set the bus number here?

Right now the code in rcar_pci_setup() sets up the bus number. Ugly
but better than before IMO. If you have any suggestions how to make
this prettier then please let me know. =)

/ magnus
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