diff options
Diffstat (limited to 'firmware/target/arm/i2s-pp.c')
-rw-r--r-- | firmware/target/arm/i2s-pp.c | 95 |
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 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Portalplayer specific code for I2S | ||
11 | * | ||
12 | * Based on code from the ipodlinux project - http://ipodlinux.org/ | ||
13 | * Adapted for Rockbox in December 2005 | ||
14 | * | ||
15 | * Original file: linux/arch/armnommu/mach-ipod/audio.c | ||
16 | * | ||
17 | * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org) | ||
18 | * | ||
19 | * All files in this archive are subject to the GNU General Public License. | ||
20 | * See the file COPYING in the source tree root for full license agreement. | ||
21 | * | ||
22 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
23 | * KIND, either express or implied. | ||
24 | * | ||
25 | ****************************************************************************/ | ||
26 | |||
27 | #include "system.h" | ||
28 | |||
29 | /* TODO: Add in PP5002 defs */ | ||
30 | #if CONFIG_CPU == PP5002 | ||
31 | void i2s_reset(void) | ||
32 | { | ||
33 | /* I2S device reset */ | ||
34 | DEV_RS |= 0x80; | ||
35 | DEV_RS &= ~0x80; | ||
36 | |||
37 | /* I2S controller enable */ | ||
38 | IISCONFIG |= 1; | ||
39 | |||
40 | /* BIT.FORMAT [11:10] = I2S (default) */ | ||
41 | /* BIT.SIZE [9:8] = 24bit */ | ||
42 | /* FIFO.FORMAT = 24 bit LSB */ | ||
43 | |||
44 | /* reset DAC and ADC fifo */ | ||
45 | IISFIFO_CFG |= 0x30000; | ||
46 | } | ||
47 | #else /* PP502X */ | ||
48 | |||
49 | /* Data format on the I2S bus */ | ||
50 | #define FORMAT_MASK (0x3 << 10) | ||
51 | #define FORMAT_I2S (0x00 << 10) | ||
52 | /* Other formats not yet known */ | ||
53 | |||
54 | /* Data size on I2S bus */ | ||
55 | #define SIZE_MASK (0x3 << 8) | ||
56 | #define SIZE_16BIT (0x00 << 10) | ||
57 | /* Other sizes not yet known */ | ||
58 | |||
59 | /* Data size/format on I2S FIFO */ | ||
60 | #define FIFO_FORMAT_MASK (0x7 << 4) | ||
61 | #define FIFO_FORMAT_32LSB (0x03 << 4) | ||
62 | /* Other formats not yet known */ | ||
63 | |||
64 | /* Are we I2S Master or slave? */ | ||
65 | #define I2S_MASTER (0x25) | ||
66 | |||
67 | #define I2S_RESET (0x1 << 31) | ||
68 | |||
69 | /* | ||
70 | * Reset the I2S BIT.FORMAT I2S, 16bit, FIFO.FORMAT 32bit | ||
71 | */ | ||
72 | void i2s_reset(void) | ||
73 | { | ||
74 | /* I2S soft reset */ | ||
75 | IISCONFIG |= I2S_RESET; | ||
76 | IISCONFIG &= ~I2S_RESET; | ||
77 | |||
78 | /* BIT.FORMAT */ | ||
79 | IISCONFIG = ((IISCONFIG & ~FORMAT_MASK) | FORMAT_I2S); | ||
80 | |||
81 | /* BIT.SIZE */ | ||
82 | IISCONFIG = ((IISCONFIG & ~SIZE_MASK) | SIZE_16BIT); | ||
83 | |||
84 | /* FIFO.FORMAT */ | ||
85 | /* If BIT.SIZE < FIFO.FORMAT low bits will be 0 */ | ||
86 | IISCONFIG = ((IISCONFIG & ~FIFO_FORMAT_MASK) | FIFO_FORMAT_32LSB); | ||
87 | |||
88 | /* RX_ATN_LVL=1 == when 12 slots full */ | ||
89 | /* TX_ATN_LVL=1 == when 12 slots empty */ | ||
90 | IISFIFO_CFG |= 0x33; | ||
91 | |||
92 | /* Rx.CLR = 1, TX.CLR = 1 */ | ||
93 | IISFIFO_CFG |= 0x1100; | ||
94 | } | ||
95 | #endif | ||