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cf8ba17154
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>
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/*
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* AESS IP block reset
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*
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* Copyright (C) 2012 Texas Instruments, Inc.
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* Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifndef __SOUND_AESS_H__
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#define __SOUND_AESS_H__
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#include <linux/kernel.h>
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#include <linux/io.h>
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/*
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* AESS_AUTO_GATING_ENABLE_OFFSET: offset in bytes of the AESS IP
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* block's AESS_AUTO_GATING_ENABLE__1 register from the IP block's
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* base address
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*/
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#define AESS_AUTO_GATING_ENABLE_OFFSET 0x07c
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/* Register bitfields in the AESS_AUTO_GATING_ENABLE__1 register */
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#define AESS_AUTO_GATING_ENABLE_SHIFT 0
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/**
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* aess_enable_autogating - enable AESS internal autogating
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* @oh: struct omap_hwmod *
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*
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* Enable internal autogating on the AESS. This allows the AESS to
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* indicate that it is idle to the OMAP PRCM. Returns 0.
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*/
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static inline void aess_enable_autogating(void __iomem *base)
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{
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u32 v;
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/* Set AESS_AUTO_GATING_ENABLE__1.ENABLE to allow idle entry */
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v = 1 << AESS_AUTO_GATING_ENABLE_SHIFT;
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writel(v, base + AESS_AUTO_GATING_ENABLE_OFFSET);
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}
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#endif /* __SOUND_AESS_H__ */
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