linux-kernel - Re: [RFC][PATCH 03/10] arm: mxc: changes to common plat-mxc code to add support for i.MX5

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Date:	Fri, 4 Dec 2009 11:59:08 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Amit Kucheria <amit.kucheria@...onical.com>
Cc:	Herring Robert-RA7055 <ra7055@...escale.com>,
	List Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, valentin.longchamp@...l.ch,
	daniel@...aq.de, grant.likely@...retlab.ca,
	Nguyen Dinh-R00091 <R00091@...escale.com>
Subject: Re: [RFC][PATCH 03/10] arm: mxc: changes to common plat-mxc code
	to add support for i.MX5

On Fri, Dec 04, 2009 at 12:31:02PM +0200, Amit Kucheria wrote:
> Some comments below:
> 
> On 09 Dec 04, Sascha Hauer wrote:
> > On Thu, Dec 03, 2009 at 08:12:58PM -0700, Herring Robert-RA7055 wrote:
> > > Amit,
> > > 
> > > I would suggest you refactor the timer code into version 1 and version 2
> > > either as 2 separate files or with a timer_is_v2() function rather than
> > > the mess of cpu_is_X macros it currently has. Essentially there are 2
> > > versions of the timer hardware. Version 1 is found on MX1/MXL and MX21.
> > > Version 2 is found on MX25, MX27, MX31, MX35, MX37, MX51, and future
> > > parts. I will send you what we have done in our tree.
> > Like this:
> > 
> > 
> > commit ed6bbc59e3f6b33b48a0d5ac053220cd318ceee7
> > Author: Sascha Hauer <s.hauer@...gutronix.de>
> > Date:   Tue Nov 17 16:31:13 2009 +0100
> > 
> >     mxc timer: Add mx51 support
> >     
> >     Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> > 
> > diff --git a/arch/arm/plat-mxc/time.c b/arch/arm/plat-mxc/time.c
> > index 844567e..0c45509 100644
> > --- a/arch/arm/plat-mxc/time.c
> > +++ b/arch/arm/plat-mxc/time.c
> > @@ -57,6 +57,9 @@
> >  #define MX3_TCN			0x24
> >  #define MX3_TCMP		0x10
> >  
> > +#define timer_is_v1()	(cpu_is_mx1() || cpu_is_mx27())
>                                                         ^^^^
>                                       Shouldn't this be mx21 according to
> 				      Rob's comment?

i.MX1, i.MX21 and i.MX27 are identical, at least that's what the code
shows, so it should be:

#define timer_is_v1()      (cpu_is_mx1() || cpu_is_mx21() || cpu_is_mx27())
#define timer_is_v2()      (cpu_is_mx3() || cpu_is_mx25() || cpu_is_mx51() || cpu_is_mxc91231())

One difference between i.MX1 and i.MX21/27 is:

static void gpt_irq_acknowledge(void)
{
	if (timer_is_v1()) {
		if (cpu_is_mx1())
			__raw_writel(0, timer_base + MX1_2_TSTAT);
		else
			__raw_writel(MX2_TSTAT_CAPT | MX2_TSTAT_COMP,
				timer_base + MX1_2_TSTAT);
	}

	if (timer_is_v2())
		__raw_writel(MX3_TSTAT_OF1, timer_base + MX3_TSTAT);
}

I'll test the code before applying it to be sure, I can test on all
CPUs except i.MX21 and the 91231.

Sascha


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