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Sansa AMS set I2C properly

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Change-Id: I95c93933487c4260a7aa43ebed273ab2c05e55c1
This commit is contained in:
William Wilgus 2018-07-29 14:03:47 +02:00
parent 6ed38c89ae
commit 4f49d21992
1 changed files with 18 additions and 5 deletions
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23
firmware/target/arm/as3525/ascodec-as3525.c
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@ -623,11 +623,25 @@ void i2c_init(void)
/* required function but called too late for our needs */
}
static void i2c_set_prescaler(unsigned int prescaler)
{
int oldlevel = disable_interrupt_save(IRQ_FIQ_STATUS);
/* must be on to write regs */
bool i2c_enabled = bitset32(&CGU_PERI, CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE) &
CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE;
I2C2_CPSR0 = prescaler & 0xFF; /* 8 lsb */
I2C2_CPSR1 = (prescaler >> 8) & 0x3; /* 2 msb */
if (!i2c_enabled) /* put it back how we found it */
bitclr32(&CGU_PERI, CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE);
restore_irq(oldlevel);
}
/* initialises the internal i2c bus and prepares for transfers to the codec */
void ascodec_init(void)
{
int prescaler;
ll_init(&req_list);
mutex_init(&as_mtx);
ascodec_async_init(&as_audio_req, ascodec_int_audio_cb, 0);
@ -637,9 +651,7 @@ void ascodec_init(void)
bitset32(&CGU_PERI, CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE);
/* prescaler for i2c clock */
prescaler = AS3525_I2C_PRESCALER;
I2C2_CPSR0 = prescaler & 0xFF; /* 8 lsb */
I2C2_CPSR1 = (prescaler >> 8) & 0x3; /* 2 msb */
i2c_set_prescaler(AS3525_I2C_PRESCALER);
/* set i2c slave address of codec part */
I2C2_SLAD0 = AS3514_I2C_ADDR << 1;
@ -690,3 +702,4 @@ void ams_i2c_get_debug_cpsr(unsigned int *i2c_cpsr)
restore_irq(oldlevel);
}