linux-kernel - Re: [PATCH 2/2] [POWERPC] MPC8349E-mITX: use platform IDE driver for CF interface

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Message-ID: <20070726211218.38b85db1@localhost.localdomain>
Date:	Thu, 26 Jul 2007 21:12:18 +0400
From:	Vitaly Bordug <vitb@...nel.crashing.org>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	linux-ide@...r.kernel.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] [POWERPC] MPC8349E-mITX: use platform IDE driver
 for CF	interface

On Wed, 25 Jul 2007 21:06:42 +0400
Sergei Shtylyov wrote:

> Hello.
> 
> Vitaly Bordug wrote:
> 
> > This updates relevant platform code (freescale mpc8349itx target) 
> > to make the CompactFlash work in TrueIDE mode. 
> 
>    Erm, I'm not sure it's worth submitting the platform device driver
> for PowerPC at this point, but well...
> 
As Ben already confirmed, it is OK to have "constructor" insert platform device if such is
required by design.

> > Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
> > Signed-off-by: Vitaly Bordug <vitb@...nel.crashing.org>
> 
> >  arch/powerpc/boot/dts/mpc8349emitx.dts    |    9 ++++
> >  arch/powerpc/platforms/83xx/mpc834x_itx.c |   70
> > +++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+), 0
> > deletions(-)
> 
> > diff --git a/arch/powerpc/boot/dts/mpc8349emitx.dts
> > b/arch/powerpc/boot/dts/mpc8349emitx.dts index db0d003..f8f0e8a
> > 100644 --- a/arch/powerpc/boot/dts/mpc8349emitx.dts
> > +++ b/arch/powerpc/boot/dts/mpc8349emitx.dts
> > @@ -37,6 +37,15 @@
> >  		reg = <00000000 10000000>;
> >  	};
> >  
> > +	ide@...00000 {
> > +		compatible = "mmio-ide";
> > +		device_type = "ide";
> 
>     Why not "ata"?
> 

we already argued around this iirc. I have no preferences and will put whatever agreed appropriate finally in here.

> > +		reg = <f0000000 10 f000020c 4>;
> > +		ioport_shift = <1>;
> 
>     Please use hyphen, not underscore in the property names
> ("device_type" seems an only exception from this rule).
>     And since using shift instead of size buys you nothing is this
> case, I'd prefer this property to be called reg-size or reg-stride.
> 
> [...]
> > diff --git a/arch/powerpc/platforms/83xx/mpc834x_itx.c
> > b/arch/powerpc/platforms/83xx/mpc834x_itx.c index 40a0194..d63a104
> > 100644 --- a/arch/powerpc/platforms/83xx/mpc834x_itx.c
> > +++ b/arch/powerpc/platforms/83xx/mpc834x_itx.c
> [...]
> > @@ -43,6 +44,75 @@ unsigned long isa_io_base = 0;
> >  unsigned long isa_mem_base = 0;
> >  #endif
> >  
> > +static int __init mmio_ide_of_init(void)
> > +{
> > +	struct device_node *np;
> > +	unsigned int i;
> > +
> > +	for (np = NULL, i = 0;
> > +	     (np = of_find_compatible_node(np, "ide",
> > "mmio-ide")) != NULL;
> > +	     i++) {
> > +		int ret = 0;
> 
>     Unneeded initialization.
> 
> > +		struct resource res[3];
> > +		struct platform_device *pdev = NULL;
> 
>     Another one.
> 

ok
> > +		static struct pata_platform_info pdata;
> > +
> > +		memset(res, 0, sizeof(res));
> > +
> > +		ret = of_address_to_resource(np, 0, &res[0]);
> > +		if (ret) {
> > +			printk(KERN_ERR "mmio-ide.%d: unable to
> > get "
> > +			       "resource from OF\n", i);
> > +			goto err0;
> > +		}
> > +
> > +		ret = of_address_to_resource(np, 1, &res[1]);
> > +		if (ret) {
> > +			printk(KERN_ERR "mmio-ide.%d: unable to
> > get "
> > +			       "resource from OF\n", i);
> > +			goto err0;
> 
>     Erm, these printk's are repetitive, isn't it better to put them
> under err0 label?
> 
> > +		}
> > +
> > +		res[2].start = res[2].end =
> > irq_of_parse_and_map(np, 0);
> > +		if (res[2].start == NO_IRQ) {
> > +			printk(KERN_ERR "mmio-ide.%d: no IRQ\n",
> > i);
> > +			goto err0;
> > +		}
> > +		res[2].name = "pata_platform";
> > +		res[2].flags = IORESOURCE_IRQ;
> > +
> > +		pdata.ioport_shift = *((u32 *)of_get_property(np,
> > +					"ioport_shift", NULL));
> > +
> > +		pdev = platform_device_alloc("pata_platform", i);
> > +		if (!pdev)
> > +			goto err1;
> 
>     Hm, not err0?
> 
agreed.

> > +
> > +		ret = platform_device_add_data(pdev, &pdata,
> > sizeof(pdata));
> > +		if (ret)
> > +			goto err1;
> > +
> > +		ret = platform_device_add_resources(pdev, res,
> > ARRAY_SIZE(res));
> > +		if (ret)
> > +			goto err1;
> > +
> > +		ret = platform_device_register(pdev);
> > +		if (ret)
> > +			goto err1;
> > +
> > +		continue;
> > +err1:
> > +		printk(KERN_ERR "mmio-ide.%d: registration
> > failed\n", i);
> > +		platform_device_del(pdev); /* it will free
> > everything */ +err0:
> > +		/* Even if some device failed, try others */
> > +		continue;
> > +	}
> > +
> > +	return 0;
> > +}
> > +device_initcall(mmio_ide_of_init);
> > +
> >  /*
> > ************************************************************************
> > *
> >   * Setup the architecture
> 
> MBR, Sergei


-- 
Sincerely, Vitaly
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