[alsa-devel] [PATCH 02/20] OMAP: McBSP: Wakeups utilized

[Tony Lindgren]

* Tony Lindgren <tony at atomide.com> [090806 15:00]:
> * Eduardo Valentin <eduardo.valentin at nokia.com> [090730 16:01]:
> > From: Eero Nurkkala <ext-eero.nurkkala at nokia.com>
> > 
> > This patch enables the smart idle mode while
> > McBPS is being utilized. Once it's done,
> > force idle mode is taken instead. Apart of it,
> > it also configures what signals will wake mcbsp up.
> > 
> > Signed-off-by: Eero Nurkkala <ext-eero.nurkkala at nokia.com>
> > Signed-off-by: Eduardo Valentin <eduardo.valentin at nokia.com>
> > ---
> >  arch/arm/plat-omap/include/mach/mcbsp.h |   17 +++++++++++++++
> >  arch/arm/plat-omap/mcbsp.c              |   35 +++++++++++++++++++++++++++++++
> >  2 files changed, 52 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
> > index 77191c5..758ad5c 100644
> > --- a/arch/arm/plat-omap/include/mach/mcbsp.h
> > +++ b/arch/arm/plat-omap/include/mach/mcbsp.h
> > @@ -134,6 +134,7 @@
> >  #define OMAP_MCBSP_REG_XCERG	0x74
> >  #define OMAP_MCBSP_REG_XCERH	0x78
> >  #define OMAP_MCBSP_REG_SYSCON	0x8C
> > +#define OMAP_MCBSP_REG_WAKEUPEN	0xA8
> >  #define OMAP_MCBSP_REG_XCCR	0xAC
> >  #define OMAP_MCBSP_REG_RCCR	0xB0
> >  
> > @@ -249,8 +250,24 @@
> >  #define RDISABLE		0x0001
> >  
> >  /********************** McBSP SYSCONFIG bit definitions ********************/
> > +#define SIDLEMODE(value)	((value)<<3)
> > +#define ENAWAKEUP		0x0004
> >  #define SOFTRST			0x0002
> >  
> > +/********************** McBSP WAKEUPEN bit definitions *********************/
> > +#define XEMPTYEOFEN		0x4000
> > +#define XRDYEN			0x0400
> > +#define XEOFEN			0x0200
> > +#define XFSXEN			0x0100
> > +#define XSYNCERREN		0x0080
> > +#define RRDYEN			0x0008
> > +#define REOFEN			0x0004
> > +#define RFSREN			0x0002
> > +#define RSYNCERREN		0x0001
> > +#define WAKEUPEN_ALL		(XEMPTYEOFEN | XRDYEN | XEOFEN | XFSXEN | \
> > +				 XSYNCERREN | RRDYEN | REOFEN | RFSREN | \
> > +				 RSYNCERREN)
> > +
> >  /* we don't do multichannel for now */
> >  struct omap_mcbsp_reg_cfg {
> >  	u16 spcr2;
> > diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
> > index 84cc323..b64896b 100644
> > --- a/arch/arm/plat-omap/mcbsp.c
> > +++ b/arch/arm/plat-omap/mcbsp.c
> > @@ -257,6 +257,23 @@ int omap_mcbsp_request(unsigned int id)
> >  	clk_enable(mcbsp->iclk);
> >  	clk_enable(mcbsp->fclk);
> >  
> > +#ifdef CONFIG_ARCH_OMAP34XX
> > +	/*
> > +	 * Enable wakup behavior, smart idle and all wakeups
> > +	 * REVISIT: some wakeups may be unnecessary
> > +	 */
> > +	if (cpu_is_omap34xx()) {
> > +		u16 syscon;
> > +
> > +		syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
> > +		syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03));
> > +		syscon |= (ENAWAKEUP | SIDLEMODE(0x02));
> > +		OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
> > +
> > +		OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, WAKEUPEN_ALL);
> > +	}
> > +#endif
> > +
> >  	/*
> >  	 * Make sure that transmitter, receiver and sample-rate generator are
> >  	 * not running before activating IRQs.
> > @@ -295,6 +312,7 @@ EXPORT_SYMBOL(omap_mcbsp_request);
> >  void omap_mcbsp_free(unsigned int id)
> >  {
> >  	struct omap_mcbsp *mcbsp;
> > +	u16 wakeupen;
> >  
> >  	if (!omap_mcbsp_check_valid_id(id)) {
> >  		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
> > @@ -305,6 +323,23 @@ void omap_mcbsp_free(unsigned int id)
> >  	if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
> >  		mcbsp->pdata->ops->free(id);
> >  
> > +#ifdef CONFIG_ARCH_OMAP34XX
> > +	/*
> > +	 * Disable wakup behavior, smart idle and all wakeups
> > +	 */
> > +	if (cpu_is_omap34xx()) {
> > +		u16 syscon;
> > +
> > +		syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
> > +		syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03));
> > +		OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
> > +
> > +		wakeupen = OMAP_MCBSP_READ(mcbsp->io_base, WAKEUPEN);
> > +		wakeupen &= ~WAKEUPEN_ALL;
> > +		OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, wakeupen);
> > +	}
> > +#endif
> > +
> >  	clk_disable(mcbsp->fclk);
> >  	clk_disable(mcbsp->iclk);
> 
> Looks like you should not need the ifdefs here, cpu_is_omap34xx() already
> optimizes the code out if not selected.

Oops, sorry looks like Jarkko already made the same comment.
 
> Regards,
> 
> Tony
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