linux-kernel - Re: [PATCH v2 1/4] PCI: iproc: enable arm64 support for iProc PCIe

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Message-ID: <55A6D73A.90206@broadcom.com>
Date:	Wed, 15 Jul 2015 14:57:14 -0700
From:	Ray Jui <rjui@...adcom.com>
To:	Hauke Mehrtens <hauke@...ke-m.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	<linux-kernel@...r.kernel.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] PCI: iproc: enable arm64 support for iProc PCIe



On 7/15/2015 2:52 PM, Hauke Mehrtens wrote:
> On 07/15/2015 06:42 AM, Ray Jui wrote:
>> This patch enables arm64 support to the iProc PCIe driver
>>
>> Signed-off-by: Ray Jui <rjui@...adcom.com>
>> Reviewed-by: Scott Branden <sbranden@...adcom.com>
>> ---
>>  drivers/pci/host/pcie-iproc.c |   15 ++++-----------
>>  drivers/pci/host/pcie-iproc.h |    8 ++++++--
>>  2 files changed, 10 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
>> index d77481e..8a556d5 100644
>> --- a/drivers/pci/host/pcie-iproc.c
>> +++ b/drivers/pci/host/pcie-iproc.c
>> @@ -58,11 +58,6 @@
>>  #define SYS_RC_INTX_EN               0x330
>>  #define SYS_RC_INTX_MASK             0xf
>>  
>> -static inline struct iproc_pcie *sys_to_pcie(struct pci_sys_data *sys)
>> -{
>> -	return sys->private_data;
>> -}
>> -
>>  /**
>>   * Note access to the configuration registers are protected at the higher layer
>>   * by 'pci_lock' in drivers/pci/access.c
>> @@ -71,8 +66,7 @@ static void __iomem *iproc_pcie_map_cfg_bus(struct pci_bus *bus,
>>  					    unsigned int devfn,
>>  					    int where)
>>  {
>> -	struct pci_sys_data *sys = bus->sysdata;
>> -	struct iproc_pcie *pcie = sys_to_pcie(sys);
>> +	struct iproc_pcie *pcie = bus->sysdata;
>>  	unsigned slot = PCI_SLOT(devfn);
>>  	unsigned fn = PCI_FUNC(devfn);
>>  	unsigned busno = bus->number;
>> @@ -208,10 +202,7 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
>>  
>>  	iproc_pcie_reset(pcie);
>>  
>> -	pcie->sysdata.private_data = pcie;
>> -
>> -	bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops,
>> -				  &pcie->sysdata, res);
>> +	bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops, pcie, res);
>>  	if (!bus) {
>>  		dev_err(pcie->dev, "unable to create PCI root bus\n");
>>  		ret = -ENOMEM;
>> @@ -229,7 +220,9 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
>>  
>>  	pci_scan_child_bus(bus);
>>  	pci_assign_unassigned_bus_resources(bus);
>> +#ifdef CONFIG_ARM
>>  	pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
>> +#endif
>>  	pci_bus_add_devices(bus);
>>  
>>  	return 0;
>> diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
>> index ba0a108..0ee9673 100644
>> --- a/drivers/pci/host/pcie-iproc.h
>> +++ b/drivers/pci/host/pcie-iproc.h
>> @@ -18,18 +18,22 @@
>>  
>>  /**
>>   * iProc PCIe device
>> + * @sysdata: Per PCI controller data. This needs to be kept at the beginning of
>> + * struct iproc_pcie, to enable support of both ARM32 and ARM64 platforms with
>> + * minimal changes in the iProc PCIe core driver
>>   * @dev: pointer to device data structure
>>   * @base: PCIe host controller I/O register base
>>   * @resources: linked list of all PCI resources
>> - * @sysdata: Per PCI controller data
>>   * @root_bus: pointer to root bus
>>   * @phy: optional PHY device that controls the Serdes
>>   * @irqs: interrupt IDs
>>   */
>>  struct iproc_pcie {
>> +#ifdef CONFIG_ARM
>> +	struct pci_sys_data sysdata;
>> +#endif
> 
> This looks for me like a dirty hack. Why is the PCIe controller
> interface between ARM and ARM64 different?

Yes I do not disagree. According to Arnd, there's already work in
process of removing the need for pci_sys_data on arm32. Before that is
done, we need this in the driver for it to work on both arm32 and arm64.

Thanks,

Ray
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