1 files changed, 95 insertions, 0 deletions

diff --git a/firmware/target/arm/i2s-pp.c b/firmware/target/arm/i2s-pp.c
new file mode 100644
index 0000000000..1485147de8
--- /dev/null
+++ b/firmware/target/arm/i2s-pp.c
@@ -0,0 +1,95 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Portalplayer specific code for I2S
+ *
+ * Based on code from the ipodlinux project - http://ipodlinux.org/
+ * Adapted for Rockbox in December 2005
+ *
+ * Original file: linux/arch/armnommu/mach-ipod/audio.c
+ *
+ * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "system.h"
+
+/* TODO: Add in PP5002 defs */
+#if CONFIG_CPU == PP5002
+void i2s_reset(void)
+{
+    /* I2S device reset */
+    DEV_RS |= 0x80;
+    DEV_RS &= ~0x80;
+
+    /* I2S controller enable */
+    IISCONFIG |= 1;
+
+    /* BIT.FORMAT [11:10] = I2S (default) */
+    /* BIT.SIZE [9:8] = 24bit */
+    /* FIFO.FORMAT = 24 bit LSB */
+
+    /* reset DAC and ADC fifo */
+    IISFIFO_CFG |= 0x30000;
+}
+#else /* PP502X */
+
+/* Data format on the I2S bus */
+#define FORMAT_MASK (0x3 << 10)
+#define FORMAT_I2S  (0x00 << 10)
+/* Other formats not yet known */
+
+/* Data size on I2S bus */
+#define SIZE_MASK   (0x3 << 8)
+#define SIZE_16BIT  (0x00 << 10)
+/* Other sizes not yet known */
+
+/* Data size/format on I2S FIFO */
+#define FIFO_FORMAT_MASK (0x7 << 4)
+#define FIFO_FORMAT_32LSB (0x03 << 4)
+/* Other formats not yet known */
+
+/* Are we I2S Master or slave? */
+#define I2S_MASTER (0x25)
+
+#define I2S_RESET (0x1 << 31)
+
+/*
+ * Reset the I2S BIT.FORMAT I2S, 16bit, FIFO.FORMAT 32bit
+ */
+void i2s_reset(void)
+{
+    /* I2S soft reset */
+    IISCONFIG |= I2S_RESET;
+    IISCONFIG &= ~I2S_RESET;
+
+    /* BIT.FORMAT */
+    IISCONFIG = ((IISCONFIG & ~FORMAT_MASK) | FORMAT_I2S);
+
+    /* BIT.SIZE */
+    IISCONFIG = ((IISCONFIG & ~SIZE_MASK) | SIZE_16BIT);
+
+    /* FIFO.FORMAT */
+    /* If BIT.SIZE < FIFO.FORMAT low bits will be 0 */
+    IISCONFIG = ((IISCONFIG & ~FIFO_FORMAT_MASK) | FIFO_FORMAT_32LSB);
+
+    /* RX_ATN_LVL=1 == when 12 slots full */
+    /* TX_ATN_LVL=1 == when 12 slots empty */
+    IISFIFO_CFG |= 0x33;
+
+    /* Rx.CLR = 1, TX.CLR = 1 */
+    IISFIFO_CFG |= 0x1100;
+}
+#endif