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ASoC: TI AESS: add autogating-enable function, callable from architecture code 

Add a basic header file for the TI AESS IP block, located in the OMAP4
Audio Back-End subsystem.

Currently, this header file only contains a function to enable the
AESS internal clock auto-gating.  This will be used by a subsequent
patch to ensure that the AESS won't block the entire chip
low-power-idle mode.  We wish to be able to place the AESS into idle
even when no AESS driver has been compiled in.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Liam Girdwood <lrg@ti.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Péter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Paul Walmsley 2013-02-10 11:22:23 -07:00
parent 6d266f63a1
commit cf8ba17154
1 changed files with 53 additions and 0 deletions
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53
include/sound/aess.h Normal file
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/*
* AESS IP block reset
*
* Copyright (C) 2012 Texas Instruments, Inc.
* Paul Walmsley
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef __SOUND_AESS_H__
#define __SOUND_AESS_H__
#include <linux/kernel.h>
#include <linux/io.h>
/*
* AESS_AUTO_GATING_ENABLE_OFFSET: offset in bytes of the AESS IP
* block's AESS_AUTO_GATING_ENABLE__1 register from the IP block's
* base address
*/
#define AESS_AUTO_GATING_ENABLE_OFFSET 0x07c
/* Register bitfields in the AESS_AUTO_GATING_ENABLE__1 register */
#define AESS_AUTO_GATING_ENABLE_SHIFT 0
/**
* aess_enable_autogating - enable AESS internal autogating
* @oh: struct omap_hwmod *
*
* Enable internal autogating on the AESS. This allows the AESS to
* indicate that it is idle to the OMAP PRCM. Returns 0.
*/
static inline void aess_enable_autogating(void __iomem *base)
{
u32 v;
/* Set AESS_AUTO_GATING_ENABLE__1.ENABLE to allow idle entry */
v = 1 << AESS_AUTO_GATING_ENABLE_SHIFT;
writel(v, base + AESS_AUTO_GATING_ENABLE_OFFSET);
}
#endif /* __SOUND_AESS_H__ */