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

Magnus Damm
2014-02-05T08:44:03Z

On Wed, Feb 5, 2014 at 5:29 PM, Ben Dooks <ben.dooks@codethink.co.uk> wrote:
> On 05/02/14 06:52, Magnus Damm wrote:
>>
>> From: Magnus Damm <damm@opensource.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@opensource.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