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

/*

 * 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__ */