[PATCHv11 1/8] ARM: OMAP2+: hwmod: Add API to enable IO ring wakeup.

[t-kristo@ti.com (Tero Kristo)]

On Tue, 2011-12-13 at 19:34 -0700, Paul Walmsley wrote:
> Hi
> 
> so I've updated this patch to change the SCM PADCTRL registers if the 
> hwmod is currently idle, and _set_idle_ioring_wakeup() is called.  
> Otherwise calling _set_idle_ioring_wakeup() would be useless under those 
> conditions, since the new I/O ring wakeup values wouldn't be written back 
> to the hardware until the hwmod had gone through an idle->enabled and 
> enabled->idle transition.  
> 
> Please try to consider the function's appropriate behavior under which 
> these functions can be called...
> 
> Updated patch below.  Will update internally once I get Tero's 
> Signed-off-by:.

Hi Paul,

Patch looks okay to me, I also quickly tested it out and it works.

Signed-off-by: Tero Kristo <t-kristo@ti.com>

> 
> 
> - Paul
> 
> From: Govindraj R <govindraj.raja@ti.com>
> Date: Tue, 13 Dec 2011 13:50:23 -0700
> Subject: [PATCH] ARM: OMAP2+: hwmod: Add API to enable IO ring wakeup
> 
> Add API to enable IO pad wakeup capability based on mux pad and
> wake_up enable flag available from hwmod_mux initialization.
> 
> Use the wakeup_enable flag and enable wakeup capability for the given
> pads. Wakeup capability will be enabled/disabled during hwmod idle
> transition based on whether wakeup_flag is set or cleared.  If the
> hwmod is currently idled, and any mux values were changed by
> _set_idle_ioring_wakeup(), the SCM PADCTRL registers will be updated.
> 
> Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
> XXX Tero's sign-off?
> [paul at pwsan.com: rearranged code to limit indentation; cleaned up
>  function documentation; removed unused non-static functions; modified
>  to search all hwmod pads, not just dynamic remuxing ones; modified to
>  update SCM regs if hwmod is currently idle and any pads have changed]
> Signed-off-by: Paul Walmsley <paul@pwsan.com>
> ---
>  arch/arm/mach-omap2/omap_hwmod.c |   47 ++++++++++++++++++++++++++++++++++++++
>  1 files changed, 47 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
> index 207a2ff..21ffd8a 100644
> --- a/arch/arm/mach-omap2/omap_hwmod.c
> +++ b/arch/arm/mach-omap2/omap_hwmod.c
> @@ -381,6 +381,51 @@ static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
>  }
>  
>  /**
> + * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
> + * @oh: struct omap_hwmod *
> + * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
> + *
> + * Set or clear the I/O pad wakeup flag in the mux entries for the
> + * hwmod @oh.  This function changes the @oh->mux->pads_dynamic array
> + * in memory.  If the hwmod is currently idled, and the new idle
> + * values don't match the previous ones, this function will also
> + * update the SCM PADCTRL registers.  Otherwise, if the hwmod is not
> + * currently idled, this function won't touch the hardware: the new
> + * mux settings are written to the SCM PADCTRL registers when the
> + * hwmod is idled.  No return value.
> + */
> +static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
> +{
> +	struct omap_device_pad *pad;
> +	bool change = false;
> +	u16 prev_idle;
> +	int j;
> +
> +	if (!oh->mux || !oh->mux->enabled)
> +		return;
> +
> +	for (j = 0; j < oh->mux->nr_pads_dynamic; j++) {
> +		pad = oh->mux->pads_dynamic[j];
> +
> +		if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP))
> +			continue;
> +
> +		prev_idle = pad->idle;
> +
> +		if (set_wake)
> +			pad->idle |= OMAP_WAKEUP_EN;
> +		else
> +			pad->idle &= ~OMAP_WAKEUP_EN;
> +
> +		if (prev_idle != pad->idle)
> +			change = true;
> +	}
> +
> +	if (change && oh->_state == _HWMOD_STATE_IDLE)
> +		omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
> +}
> +
> +/**
>   * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
>   * @oh: struct omap_hwmod *
>   *
> @@ -2416,6 +2461,7 @@ int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
>  	v = oh->_sysc_cache;
>  	_enable_wakeup(oh, &v);
>  	_write_sysconfig(v, oh);
> +	_set_idle_ioring_wakeup(oh, true);
>  	spin_unlock_irqrestore(&oh->_lock, flags);
>  
>  	return 0;
> @@ -2446,6 +2492,7 @@ int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
>  	v = oh->_sysc_cache;
>  	_disable_wakeup(oh, &v);
>  	_write_sysconfig(v, oh);
> +	_set_idle_ioring_wakeup(oh, false);
>  	spin_unlock_irqrestore(&oh->_lock, flags);
>  
>  	return 0;