linux-kernel - Re: [PATCH v2 01/13] mfd: pruss mfd driver.

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Date:	Tue, 22 Feb 2011 17:27:51 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Subhasish Ghosh <subhasish@...tralsolutions.com>
CC:	Samuel Ortiz <sameo@...ux.intel.com>, sachi@...tralsolutions.com,
	davinci-linux-open-source@...ux.davincidsp.com, nsekhar@...com,
	open list <linux-kernel@...r.kernel.org>, m-watkins@...com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 01/13] mfd: pruss mfd driver.

On 02/22/2011 01:49 PM, Subhasish Ghosh wrote:
> I am not sure if I understood you correctly, but the current sizeof the
> structure da8xx_prusscore_regs  is 0x500.
> 
> Here is a link to the PRUSS memory map:
> http://processors.wiki.ti.com/index.php/PRUSS_Memory_Map
> 
> The offset 0x00007000 is the PRU0 reg offset and 0x00007800 is the PRU1
> reg offset.
> We cannot have a register file larger than this, but lot of space is
> left out, possibly for future development.

What do you mean with "larger than this"? You ioremap the whole space
and unsued space could be filled with padding bytes:

struct pruss_regs {
	u8 ram0[0x0200];
	u8 res0[0x1e00];
	u8 ram1[0x0200];
	u8 res1[0x1e00];
	struct pruss_intc_regs intc;
	struct pruss_core_regs core[2];
};

Then:

  pruss_dev->regs = ioremap(pruss_dev->res->start,
	   	    resource_size(pruss_dev->res));

  __raw_writel(DA8XX_PRUCORE_CONTROL_RESETVAL,
               &pruss_dev->regs.core[pruss_num].control);

That's simple, transparent and save without magic offset handling.

Wolfgang.
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