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authorPaul Walmsley <paul@pwsan.com>2013-02-10 19:22:23 +0100
committerPaul Walmsley <paul@pwsan.com>2013-02-10 19:22:23 +0100
commitcf8ba17154b0977e9195b160aef6c934270a08c1 (patch)
treea88cfcfb05659c2f29da3313fc86f94fa29d9b0c
parentARM: OMAP2+: hwmod: add enable_preprogram hook (diff)
downloadlinux-cf8ba17154b0977e9195b160aef6c934270a08c1.tar.xz
linux-cf8ba17154b0977e9195b160aef6c934270a08c1.zip
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>
-rw-r--r--include/sound/aess.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/include/sound/aess.h b/include/sound/aess.h
new file mode 100644
index 000000000000..cee0d09fadbd
--- /dev/null
+++ b/include/sound/aess.h
@@ -0,0 +1,53 @@
+/*
+ * 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__ */