linux-kernel - Re: [PATCH 2/3] siimage: add sil

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Message-Id: <200804272148.29131.bzolnier@gmail.com>
Date:	Sun, 27 Apr 2008 21:48:28 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] siimage: add sil_* I/O ops

On Saturday 19 April 2008, Sergei Shtylyov wrote:

[...]

> > @@ -124,6 +124,54 @@ static inline unsigned long siimage_seld
> >  	return base;
> >  }
> >  
> > +static u8 sil_ioread8(struct pci_dev *dev, unsigned long addr)
> > +{
> > +	u8 tmp = 0;
> > +
> > +	if (pci_get_drvdata(dev))
> > +		tmp = readb((void __iomem *)addr);
> > +	else
> > +		pci_read_config_byte(dev, addr, &tmp);
> > +
> > +	return tmp;
> > +}
> > +
> > +static u16 sil_ioread16(struct pci_dev *dev, unsigned long addr)
> > +{
> > +	u16 tmp = 0;
> > +
> > +	if (pci_get_drvdata(dev))
> > +		tmp = readw((void __iomem *)addr);
> > +	else
> > +		pci_read_config_word(dev, addr, &tmp);
> > +
> > +	return tmp;
> > +}
> > +
> > +static void sil_iowrite8(struct pci_dev *dev, u8 val, unsigned long addr)
> > +{
> > +	if (pci_get_drvdata(dev))
> > +		writeb(val, (void __iomem *)addr);
> > +	else
> > +		pci_write_config_byte(dev, addr, val);
> > +}
> > +
> > +static void sil_iowrite16(struct pci_dev *dev, u16 val, unsigned long addr)
> > +{
> > +	if (pci_get_drvdata(dev))
> > +		writew(val, (void __iomem *)addr);
> > +	else
> > +		pci_write_config_word(dev, addr, val);
> > +}
> > +
> > +static void sil_iowrite32(struct pci_dev *dev, u32 val, unsigned long addr)
> > +{
> > +	if (pci_get_drvdata(dev))
> > +		writel(val, (void __iomem *)addr);
> > +	else
> > +		pci_write_config_dword(dev, addr, val);
> > +}
> > +
> 
>     I think this could be further imporoved -- since we have to call 
> pci_get_drvdata() in the accessors anyway, we could have used it to get the 
> MMIO base right there, and thus be freed from the necessity to add it to the 
> MMIO offset in the callers and also most probably from having it copied to 
> hwif->hwif_data.

[...]

Or maybe we can remove sil_io* and always use PCI access (on the second
look none of sil_io* users seems to be performance critical)...

> > @@ -557,50 +513,80 @@ static unsigned int setup_mmio_siimage (
> [...]
> > +	sil_iowrite8(dev,        0x72, base + 0xA1);
> > +	sil_iowrite16(dev,     0x328A, base + 0xA2);
> > +	sil_iowrite32(dev, 0x62DD62DD, base + 0xA4);
> > +	sil_iowrite32(dev, 0x43924392, base + 0xA8);
> > +	sil_iowrite32(dev, 0x40094009, base + 0xAC);
> > +	sil_iowrite8(dev,        0x72, base ? (base + 0xE1) : 0xB1);
> > +	sil_iowrite16(dev,     0x328A, base ? (base + 0xE2) : 0xB2);
> > +	sil_iowrite32(dev, 0x62DD62DD, base ? (base + 0xE4) : 0xB4);
> > +	sil_iowrite32(dev, 0x43924392, base ? (base + 0xE8) : 0xB8);
> > +	sil_iowrite32(dev, 0x40094009, base ? (base + 0xEC) : 0xBC);
> > +
> 
>     Sigh, I was going to send a patch getting rid of these writes altogether 
> last year -- there should be no point in setting PIO/DMA/UDMA timings here.

Heh, I know the feeling damn too well - I still have few low-prio patches
back from *2004* which need to be refreshed and pushed out...

> Maybe I'll submit it...

Just do it. ;)

Thanks,
Bart
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