linux-kernel - Re: [PATCH v9 3/9] ARM: edma: add AM33XX support to the private EDMA API

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Date:	Tue, 12 Mar 2013 12:08:07 -0400
From:	Matt Porter <mporter@...com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Russell King <linux@....linux.org.uk>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Sekhar Nori <nsekhar@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 3/9] ARM: edma: add AM33XX support to the private EDMA
 API

On Thu, Mar 07, 2013 at 08:42:18AM +0200, Andy Shevchenko wrote:
> On Wed, Mar 6, 2013 at 6:15 PM, Matt Porter <mporter@...com> wrote:
> > Adds support for parsing the TI EDMA DT data into the
> > required EDMA private API platform data. Enables runtime
> > PM support to initialize the EDMA hwmod. Adds AM33XX EDMA
> > crossbar event mux support. Enables build on OMAP.
> 
> > --- a/arch/arm/common/edma.c
> > +++ b/arch/arm/common/edma.c
> 
> > +static int edma_xbar_event_map(struct device *dev,
> > +                              struct device_node *node,
> > +                              struct edma_soc_info *pdata, int len)
> > +{
> > +       int ret = 0;
> > +       int i;
> > +       struct resource res;
> > +       void *xbar;
> > +       const s16 (*xbar_chans)[2];
> > +       u32 shift, offset, mux;
> > +
> > +       xbar_chans = devm_kzalloc(dev,
> > +                                 len/sizeof(s16) + 2*sizeof(s16),
> > +                                 GFP_KERNEL);
> > +       if (!xbar_chans)
> > +               return -ENOMEM;
> > +
> > +       ret = of_address_to_resource(node, 1, &res);
> > +       if (ret)
> > +               return -EIO;
> > +
> > +       xbar = devm_ioremap(dev, res.start, resource_size(&res));
> > +       if (!xbar)
> > +               return -ENOMEM;
> > +
> > +       ret = edma_of_read_u32_to_s16_array(node,
> > +                                           "ti,edma-xbar-event-map",
> > +                                           (s16 *)xbar_chans,
> > +                                           len/sizeof(u32));
> > +       if (ret)
> > +               return -EIO;
> > +
> > +       for (i = 0; xbar_chans[i][0] != -1; i++) {
> > +               shift = (xbar_chans[i][1] % 4) * 8;
> 
> Looks like shift = (xbar_chans[i][1] & 0x03) << 3;

Yes, will update.

> > +               offset = xbar_chans[i][1] >> 2;
> > +               offset <<= 2;
> 
> Is it offset = xbar_chans[i][1] & 0xfffc; ?

Yes, will update

> > +               mux = readl((void *)((u32)xbar + offset));
> > +               mux &= ~(0xff << shift);
> > +               mux |= xbar_chans[i][0] << shift;
> > +               writel(mux, (void *)((u32)xbar + offset));
> > +       }
> 
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@...ts.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
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