diff options
Diffstat (limited to 'firmware/target/arm')
| -rw-r--r-- | firmware/target/arm/as3525/as3525-codec.c | 132 | ||||
| -rw-r--r-- | firmware/target/arm/as3525/as3525-codec.h | 27 |
2 files changed, 159 insertions, 0 deletions
diff --git a/firmware/target/arm/as3525/as3525-codec.c b/firmware/target/arm/as3525/as3525-codec.c new file mode 100644 index 0000000000..1de2f49e1a --- /dev/null +++ b/firmware/target/arm/as3525/as3525-codec.c @@ -0,0 +1,132 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id: $ + * + * Copyright (C) 2008 by Bertrik Sikken + * + * 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; either version 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +/* + Provides access to the codec/charger/rtc/adc part of the as3525. + This part is on address 0x46 of the internal i2c bus in the as3525. + Registers in the codec part seem to be nearly identical to the registers + in the AS3514 (used in the "v1" versions of the sansa c200 and e200). + + I2C register description: + * I2C2_CNTRL needs to be set to 0x51 for transfers to work at all. + bit 1 indicates direction of transfer (0 = write, 1 = read) + * I2C2_SR (status register) indicates in bit 0 if a transfer is busy. + * I2C2_SLAD0 contains the i2c slave address to read from / write to. + * I2C2_CPSR0/1 is the divider from the peripheral clock to the i2c clock. + * I2C2_DACNT sets the number of bytes to transfer and actually starts it. + + When a transfer is attempted to a non-existing i2c slave address, + interrupt bit 7 is raised and DACNT is not decremented after the transfer. + */ + +#include "as3525-codec.h" +#include "as3525.h" + +#define AUDIO_I2C_ADDR 0x46
+ +#define I2C2_DATA *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x00))
+#define I2C2_SLAD0 *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x04))
+#define I2C2_CNTRL *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x0C))
+#define I2C2_DACNT *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x10))
+#define I2C2_CPSR0 *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x1C))
+#define I2C2_CPSR1 *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x20))
+#define I2C2_IMR *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x24)) +#define I2C2_RIS *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x28))
+#define I2C2_MIS *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x2C))
+#define I2C2_SR *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x30))
+#define I2C2_INT_CLR *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x40))
+#define I2C2_SADDR *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x44)) + + +/* initialises the internal i2c bus and prepares for transfers to the codec */
+void as3525_codec_init(void)
+{
+ /* reset device */ + CCU_SRC = CCU_SRC_I2C_AUDIO_EN; + CCU_SRL = CCU_SRL_MAGIC_NUMBER; + CCU_SRL = 0;
+
+ /* enable clock */ + CGU_PERI |= CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE;
+ + /* prescaler for i2c clock */ + I2C2_CPSR0 = 60; /* 24 MHz / 400 kHz */ + I2C2_CPSR1 = 0; /* MSB */ + + /* set i2c slave address of codec part */ + I2C2_SLAD0 = AUDIO_I2C_ADDR << 1;
+ + I2C2_CNTRL = 0x51; +}
+
+ +/* returns != 0 when busy */
+static int i2c_busy(void)
+{
+ return (I2C2_SR & 1);
+}
+
+ +/* returns 0 on success, <0 otherwise */
+int as3525_codec_write(int index, int value)
+{
+ if (index == 0x21) {
+ /* prevent setting of the LREG_CP_not bit */
+ value &= ~(1 << 5);
+ }
+
+ /* check if still busy */
+ if (i2c_busy()) { + return -1;
+ }
+
+ /* start transfer */
+ I2C2_SADDR = index; + I2C2_CNTRL &= ~(1 << 1);
+ I2C2_DATA = value;
+ I2C2_DACNT = 1;
+
+ /* wait for transfer*/
+ while (i2c_busy());
+ + return 0;
+}
+
+ +/* returns value read on success, <0 otherwise */ +int as3525_codec_read(int index)
+{ + /* check if still busy */
+ if (i2c_busy()) {
+ return -1;
+ }
+ + /* start transfer */
+ I2C2_SADDR = index;
+ I2C2_CNTRL |= (1 << 1);
+ I2C2_DACNT = 1;
+ + /* wait for transfer*/
+ while (i2c_busy());
+
+ return I2C2_DATA;
+}
+ diff --git a/firmware/target/arm/as3525/as3525-codec.h b/firmware/target/arm/as3525/as3525-codec.h new file mode 100644 index 0000000000..9d694554c6 --- /dev/null +++ b/firmware/target/arm/as3525/as3525-codec.h @@ -0,0 +1,27 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id: $ + * + * Copyright (C) 2008 by Bertrik Sikken + * + * 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; either version 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +void as3525_codec_init(void); + +int as3525_codec_write(int index, int value); +int as3525_codec_read(int index);
+ + |