linux-kernel - Re: [PATCH v11 3/8] ARM: edma: Add EDMA crossbar event mux support

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Date:	Wed, 19 Jun 2013 19:36:48 -0500
From:	Joel A Fernandes <agnel.joel@...il.com>
To:	Sekhar Nori <nsekhar@...com>
Cc:	Joel A Fernandes <joelagnel@...com>,
	Tony Lindgren <tony@...mide.com>,
	Matt Porter <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Benoit Cousson <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Rob Landley <rob@...dley.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Kridner <jkridner@...gleboard.org>,
	Koen Kooi <koen@...gleboard.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v11 3/8] ARM: edma: Add EDMA crossbar event mux support

Hi Sekhar,
Thanks for the feedback.

On Tue, Jun 18, 2013 at 5:19 AM, Sekhar Nori <nsekhar@...com> wrote:
> On 6/18/2013 12:08 PM, Joel A Fernandes wrote:
>> From: Matt Porter <mporter@...com>
>>
>> Changes by Joel:
>> * Split EDMA xbar support out of original EDMA DT parsing patch
>> to keep it easier for review.
>> * Rewrite shift and offset calculation.
>>
>> Suggested-by: Sekhar Nori <nsekhar@...com>
>> Suggested by: Andy Shevchenko <andy.shevchenko@...il.com>
>> Signed-off-by: Joel A Fernandes <joelagnel@...com>
>>
>> Reference:
>> [1] https://patchwork.kernel.org/patch/2226991/
>> ---
>>  arch/arm/common/edma.c             |   59 ++++++++++++++++++++++++++++++++++++
>>  include/linux/platform_data/edma.h |    1 +
>>  2 files changed, 60 insertions(+)
>>
>> diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
>> index 9823b79..1c2fb15 100644
>> --- a/arch/arm/common/edma.c
>> +++ b/arch/arm/common/edma.c
>> @@ -1410,6 +1410,52 @@ static int edma_of_read_u32_to_s16_array(const struct device_node *np,
>>       return 0;
>>  }
>>
>> +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;
>
> void __iomem *xbar;

OK.

>> +     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] & 0x03) << 3;
>> +             offset = xbar_chans[i][1] & 0xfffffffc;
>> +             mux = readl((void *)((u32)xbar + offset));
>
> Please drop unnecessary casting. Simply:

Done.

>
>         mux = readl(xbar + offset);
>
>> +             mux &= ~(0xff << shift);
>> +             mux |= xbar_chans[i][0] << shift;
>> +             writel(mux, (void *)((u32)xbar + offset));
>
> Fix the writel likewise.

Done.


>>               }
>>
>> +             /* Clear the xbar mapped channels in unused list */
>> +             xbar_chans = info[j]->xbar_chans;
>> +             if (xbar_chans) {
>> +                     for (i = 0; xbar_chans[i][1] != -1; i++) {
>> +                             off = xbar_chans[i][1];
>> +                             clear_bits(off, 1,
>> +                                     edma_cc[j]->edma_unused);
>
> Please fix the alignment here.

I noticed the alignment was off in a few other places in that driver.
Fixed those up too.

Thanks,
Joel
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