linux-kernel - RE: [PATCH v4 2/2] Defines DA850/AM18xx/OMAPL1-38 SOC resources used by PRUSS UIO driver

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Date:	Mon, 28 Feb 2011 15:38:38 +0530
From:	"Nori, Sekhar" <nsekhar@...com>
To:	"TK, Pratheesh Gangadhar" <pratheesh@...com>,
	Sergei Shtylyov <sshtylyov@...sta.com>
CC:	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"Chatterjee, Amit" <amit.chatterjee@...com>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hjk@...sjkoch.de" <hjk@...sjkoch.de>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v4 2/2] Defines DA850/AM18xx/OMAPL1-38 SOC resources
	used by PRUSS UIO driver

Hi Pratheesh,

On Mon, Feb 28, 2011 at 10:16:18, TK, Pratheesh Gangadhar wrote:

> > > diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-
> > davinci/devices-da8xx.c
> > > index beda8a4..4ea3d1f 100644
> > > --- a/arch/arm/mach-davinci/devices-da8xx.c
> > > +++ b/arch/arm/mach-davinci/devices-da8xx.c
> > > @@ -725,3 +725,76 @@ int __init da8xx_register_cpuidle(void)
> > >
> > >   	return platform_device_register(&da8xx_cpuidle_device);
> > >   }
> > > +static struct resource pruss_resources[] = {
> > > +	[0] = {
> > > +		.start  = DA8XX_PRUSS_BASE,
> > > +		.end    = DA8XX_PRUSS_BASE + SZ_64K - 1,
> > > +		.flags  = IORESOURCE_MEM,
> > > +	},
> > > +	[1] = {
> > > +		.start  = DA8XX_L3RAM_BASE,
> > > +		.end    = DA8XX_L3RAM_BASE + SZ_128K - 1,
> > > +		.flags  = IORESOURCE_MEM,
> > > +	},
> > > +	[2] = {
> > > +		.start  = 0,
> > > +		.end    = SZ_256K - 1,
> > 
> >     Huh? I don't see where it's filled...
> > 
> The current use is only to indicate memory block size to the PRUSS UIO 
> driver when we allocate DDR memory using dma_alloc_coherent.

If the user/platform needs to specify the amount of memory that
will be allocated by the driver, it can be done though platform
data or (better) using module params.

> sram_alloc is changed to use L3_RAM (128KB) instead of ARM RAM (8KB) in 
> Mistral patch set - I need to follow the same convention for L3 RAM as well 
> if I need to align with that patch. Is there a better way to do this?

Yes, with that patch sram_alloc() will allocate from L3 RAM. You can make
calls to sram_alloc() in your driver. Again the size to be allocated can
be platform data or module params.

Thanks,
Sekhar

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