linux-kernel - Re: [PATCH take #5] [libata] libata driver for bf548 on chip ATAPI controller.

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Date:	Thu, 16 Aug 2007 14:56:22 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Mike Frysinger <vapier.adi@...il.com>
CC:	Sonic Zhang <sonic.adi@...il.com>,
	Linux IDE <linux-ide@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Bryan Wu <bryan.wu@...log.com>
Subject: Re: [PATCH take #5] [libata] libata driver for bf548 on chip ATAPI
 controller.

Mike Frysinger wrote:
> On 8/16/07, Jeff Garzik <jeff@...zik.org> wrote:
>> Mike Frysinger wrote:
>>> On 8/16/07, Jeff Garzik <jeff@...zik.org> wrote:
>>>> Sonic Zhang wrote:
>>>>> +static void bfin_set_piomode(struct ata_port *ap, struct ata_device *adev)
>>>>> +{
>>>>> +     int mode = adev->pio_mode - XFER_PIO_0;
>>>>> +     unsigned long base = (unsigned long)ap->ioaddr.ctl_addr;
>>>> (added Bryan Wu to CC)
>>>>
>>>> Someone needs to need fix the bfin architecture:  the addresses on the
>>>> bfin_read/bfin_write functions should be 'void __iomem *' not unsigned long.
>>> there are no address pointers anymore, so there is nothing to cast ...
>>> the bfin_read/bfin_write macros are done in sexy asm:
>>> #define bfin_write8(addr,val) __asm__ __volatile__("b[%0] = %1;" ::
>>> "a"(addr), "d"(val))
>>> or i'm misunderstanding what you mean ...
>>>
>>> where do you see (unsigned long) ?
>> Look up (into the message you quoted).
> 
> yes, you quoted the driver, not the Blackfin core parts
> 
>> Regardless of the implementation, the C type system should be employed
>> to ensure that 'addr' is known to the compiler as 'void __iomem *'
>> rather than unsigned long.
> 
> i agree the specific pata driver should be declared the way you
> described, however i dont see how that has bearing on the
> bfin_read/bfin_write macros as you seemed to indicate

Macros completely ignore the C type system.  Look at other architectures 
if you cannot figure out how to implement a static inline with stronger 
typing.

	Jeff



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