linux-kernel - Re: [PATCH v6 3/3] qe_common: add qe_muram

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Message-ID: <1440519935.16577.7.camel@freescale.com>
Date:	Tue, 25 Aug 2015 11:25:35 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Zhao Qiang-B45475 <qiang.zhao@...escale.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"lauraa@...eaurora.org" <lauraa@...eaurora.org>,
	Xie Xiaobo-R63061 <X.Xie@...escale.com>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	Li Yang-Leo-R58472 <LeoLi@...escale.com>,
	"paulus@...ba.org" <paulus@...ba.org>
Subject: Re: [PATCH v6 3/3] qe_common: add qe_muram_ functions to manage
 muram

On Tue, 2015-08-25 at 02:52 -0500, Zhao Qiang-B45475 wrote:
> On Tue, 2015-08-25 at 12:35 +0800, Wood Scott-B07421 wrote:
> > -----Original Message-----
> > From: Wood Scott-B07421
> > Sent: Tuesday, August 25, 2015 12:35 AM
> > To: Zhao Qiang-B45475
> > Cc: linux-kernel@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org;
> > lauraa@...eaurora.org; Xie Xiaobo-R63061; benh@...nel.crashing.org; Li
> > Yang-Leo-R58472; paulus@...ba.org
> > Subject: Re: [PATCH v6 3/3] qe_common: add qe_muram_ functions to manage
> > muram
> > 
> > On Mon, 2015-08-24 at 17:31 +0800, Zhao Qiang wrote:
> > 
> > > @@ -187,12 +190,41 @@ static inline int qe_alive_during_sleep(void)
> > >  }
> > > 
> > >  /* we actually use cpm_muram implementation, define this for
> > convenience */
> > > -#define qe_muram_init cpm_muram_init
> > > -#define qe_muram_alloc cpm_muram_alloc
> > > -#define qe_muram_alloc_fixed cpm_muram_alloc_fixed
> > > -#define qe_muram_free cpm_muram_free
> > > -#define qe_muram_addr cpm_muram_addr
> > > -#define qe_muram_offset cpm_muram_offset
> > > +int qe_muram_init(void);
> > > +
> > > +#if defined(CONFIG_QUICC_ENGINE)
> > > +unsigned long qe_muram_alloc(unsigned long size, unsigned long align);
> > > +int qe_muram_free(unsigned long offset);
> > > +void __iomem *qe_muram_addr(unsigned long offset);
> > > +unsigned long qe_muram_offset(void __iomem *addr);
> > > +dma_addr_t qe_muram_dma(void __iomem *addr);
> > > +#else
> > > +static inline unsigned long qe_muram_alloc(unsigned long size,
> > > +                                         unsigned long align)
> > > +{
> > > +     return -ENOSYS;
> > > +}
> > 
> > What code calls these functions without CONFIG_QUICC_ENGINE?
> > 
> > Are you converting qe without cpm?  Why?
> 
> CPM just work on PowerPC old boards, it is not necessary to convert it.  

I disagree.  Converting it would remove a user of rheap, and not converting 
it introduces code duplication.  The muram code is currently shared between 
CPM and QE, so converting it doesn't add much effort.

-Scott

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