diff options
Diffstat (limited to 'firmware/target/arm/as3525/ascodec-as3525.c')
| -rw-r--r-- | firmware/target/arm/as3525/ascodec-as3525.c | 229 |
1 files changed, 123 insertions, 106 deletions
diff --git a/firmware/target/arm/as3525/ascodec-as3525.c b/firmware/target/arm/as3525/ascodec-as3525.c index 708215deed..54a579ad0d 100644 --- a/firmware/target/arm/as3525/ascodec-as3525.c +++ b/firmware/target/arm/as3525/ascodec-as3525.c @@ -88,6 +88,31 @@ #define IFDEBUG(x) #endif +#define ASCODEC_REQ_READ 0 +#define ASCODEC_REQ_WRITE 1 + +/* + * How many bytes we using in struct ascodec_request for the data buffer. + * 4 fits the alignment best right now. + * We don't actually use more than 3 at the moment (when reading interrupts) + * Upper limit would be 255 since DACNT is 8 bits! + */ +#define ASCODEC_REQ_MAXLEN 4 + +typedef void (ascodec_cb_fn)(unsigned const char *data, unsigned cnt); + +struct ascodec_request { + unsigned char type; + unsigned char index; + unsigned char status; + unsigned char cnt; + unsigned char data[ASCODEC_REQ_MAXLEN]; + struct wakeup wkup; + ascodec_cb_fn *callback; + struct ascodec_request *next; +}; + + static struct mutex as_mtx; static int ascodec_enrd0_shadow = 0; @@ -110,18 +135,94 @@ static int int_rtc = 0; static int int_adc = 0; #endif /* DEBUG */ -static void ascodec_read_cb(unsigned const char *data, unsigned int len); +/* returns != 0 when busy */ +static inline int i2c_busy(void) +{ + return (I2C2_SR & 1); +} + +static void ascodec_finish_req(struct ascodec_request *req) +{ + /* + * Wait if still busy, unfortunately this happens since + * the controller is running at a low divisor, so it's + * still busy when we serviced the interrupt. + * I tried upping the i2c speed to 4MHz which + * made the number of busywait cycles much smaller + * (none for reads and only a few for writes), + * but who knows if it's reliable at that frequency. ;) + * For one thing, 8MHz doesn't work, so 4MHz is likely + * borderline. + * In general writes need much more wait cycles than reads + * for some reason, possibly because we read the data register + * for reads, which will likely block the processor while + * the i2c controller responds to the register read. + */ + while (i2c_busy()); + + /* disable clock */ + CGU_PERI &= ~CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE; -static void ascodec_start_req(struct ascodec_request *req); -static int ascodec_continue_req(struct ascodec_request *req, int irq_status); -static void ascodec_finish_req(struct ascodec_request *req); + req->status = 1; -void INT_AUDIO(void) + if (req->callback) { + req->callback(req->data, req_data_ptr - req->data); + } + wakeup_signal(&req->wkup); + + req_head = req->next; + req->next = NULL; + if (req_head == NULL) + req_tail = NULL; + +} + +static int ascodec_continue_req(struct ascodec_request *req, int irq_status) { - VIC_INT_EN_CLEAR = INTERRUPT_AUDIO; - IFDEBUG(int_audio_ctr++); + if ((irq_status & (I2C2_IRQ_RXOVER|I2C2_IRQ_ACKTIMEO)) > 0) { + /* some error occured, restart the request */ + return REQ_RETRY; + } + if (req->type == ASCODEC_REQ_READ && + (irq_status & I2C2_IRQ_RXFULL) > 0) { + *(req_data_ptr++) = I2C2_DATA; + } else { + if (req->cnt > 1 && + (irq_status & I2C2_IRQ_TXEMPTY) > 0) { + I2C2_DATA = *(req_data_ptr++); + } + } - ascodec_async_read(AS3514_IRQ_ENRD0, 3, &as_audio_req, ascodec_read_cb); + req->index++; + if (--req->cnt > 0) + return REQ_UNFINISHED; + + return REQ_FINISHED; +} + +static void ascodec_start_req(struct ascodec_request *req) +{ + int unmask = 0; + + /* enable clock */ + CGU_PERI |= CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE; + + /* start transfer */ + I2C2_SADDR = req->index; + if (req->type == ASCODEC_REQ_READ) { + req_data_ptr = req->data; + /* start transfer */ + I2C2_CNTRL = I2C2_CNTRL_DEFAULT | I2C2_CNTRL_READ; + unmask = I2C2_IRQ_RXFULL|I2C2_IRQ_RXOVER; + } else { + req_data_ptr = &req->data[1]; + I2C2_CNTRL = I2C2_CNTRL_DEFAULT | I2C2_CNTRL_WRITE; + I2C2_DATA = req->data[0]; + unmask = I2C2_IRQ_TXEMPTY|I2C2_IRQ_ACKTIMEO; + } + + I2C2_DACNT = req->cnt; + I2C2_IMR |= unmask; /* enable interrupts */ } void INT_I2C_AUDIO(void) @@ -207,13 +308,7 @@ void ascodec_init(void) #endif } -/* returns != 0 when busy */ -static int i2c_busy(void) -{ - return (I2C2_SR & 1); -} - -void ascodec_req_init(struct ascodec_request *req, int type, +static void ascodec_req_init(struct ascodec_request *req, int type, unsigned int index, unsigned int cnt) { wakeup_init(&req->wkup); @@ -224,7 +319,7 @@ void ascodec_req_init(struct ascodec_request *req, int type, req->cnt = cnt; } -void ascodec_submit(struct ascodec_request *req) +static void ascodec_submit(struct ascodec_request *req) { int oldlevel = disable_irq_save(); @@ -241,90 +336,6 @@ void ascodec_submit(struct ascodec_request *req) restore_irq(oldlevel); } -static void ascodec_start_req(struct ascodec_request *req) -{ - int unmask = 0; - - /* enable clock */ - CGU_PERI |= CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE; - - /* start transfer */ - I2C2_SADDR = req->index; - if (req->type == ASCODEC_REQ_READ) { - req_data_ptr = req->data; - /* start transfer */ - I2C2_CNTRL = I2C2_CNTRL_DEFAULT | I2C2_CNTRL_READ; - unmask = I2C2_IRQ_RXFULL|I2C2_IRQ_RXOVER; - } else { - req_data_ptr = &req->data[1]; - I2C2_CNTRL = I2C2_CNTRL_DEFAULT | I2C2_CNTRL_WRITE; - I2C2_DATA = req->data[0]; - unmask = I2C2_IRQ_TXEMPTY|I2C2_IRQ_ACKTIMEO; - } - - I2C2_DACNT = req->cnt; - I2C2_IMR |= unmask; /* enable interrupts */ -} - -static int ascodec_continue_req(struct ascodec_request *req, int irq_status) -{ - if ((irq_status & (I2C2_IRQ_RXOVER|I2C2_IRQ_ACKTIMEO)) > 0) { - /* some error occured, restart the request */ - return REQ_RETRY; - } - if (req->type == ASCODEC_REQ_READ && - (irq_status & I2C2_IRQ_RXFULL) > 0) { - *(req_data_ptr++) = I2C2_DATA; - } else { - if (req->cnt > 1 && - (irq_status & I2C2_IRQ_TXEMPTY) > 0) { - I2C2_DATA = *(req_data_ptr++); - } - } - - req->index++; - if (--req->cnt > 0) - return REQ_UNFINISHED; - - return REQ_FINISHED; -} - -static void ascodec_finish_req(struct ascodec_request *req) -{ - /* - * Wait if still busy, unfortunately this happens since - * the controller is running at a low divisor, so it's - * still busy when we serviced the interrupt. - * I tried upping the i2c speed to 4MHz which - * made the number of busywait cycles much smaller - * (none for reads and only a few for writes), - * but who knows if it's reliable at that frequency. ;) - * For one thing, 8MHz doesn't work, so 4MHz is likely - * borderline. - * In general writes need much more wait cycles than reads - * for some reason, possibly because we read the data register - * for reads, which will likely block the processor while - * the i2c controller responds to the register read. - */ - while (i2c_busy()); - - /* disable clock */ - CGU_PERI &= ~CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE; - - req->status = 1; - - if (req->callback) { - req->callback(req->data, req_data_ptr - req->data); - } - wakeup_signal(&req->wkup); - - req_head = req->next; - req->next = NULL; - if (req_head == NULL) - req_tail = NULL; - -} - static int irq_disabled(void) { unsigned long cpsr; @@ -350,9 +361,8 @@ static void ascodec_wait(struct ascodec_request *req) * The request struct passed in must be allocated statically. * If you call ascodec_async_write from different places, each * call needs it's own request struct. - * This comment is duplicated in .c and .h for your convenience. */ -void ascodec_async_write(unsigned int index, unsigned int value, +static void ascodec_async_write(unsigned int index, unsigned int value, struct ascodec_request *req) { if (index == AS3514_CVDD_DCDC3) /* prevent setting of the LREG_CP_not bit */ @@ -380,9 +390,8 @@ int ascodec_write(unsigned int index, unsigned int value) * call needs it's own request struct. * If len is bigger than ASCODEC_REQ_MAXLEN it will be * set to ASCODEC_REQ_MAXLEN. - * This comment is duplicated in .c and .h for your convenience. */ -void ascodec_async_read(unsigned int index, unsigned int len, +static void ascodec_async_read(unsigned int index, unsigned int len, struct ascodec_request *req, ascodec_cb_fn *cb) { if (len > ASCODEC_REQ_MAXLEN) @@ -433,8 +442,8 @@ int ascodec_readbytes(unsigned int index, unsigned int len, unsigned char *data) static void ascodec_read_cb(unsigned const char *data, unsigned int len) { - if (len != 3) /* some error happened? */ - return; + if (UNLIKELY(len != 3)) /* some error happened? */ + panicf("INT_AUDIO callback got %d regs", len); if (data[0] & CHG_ENDOFCH) { /* chg finished */ ascodec_enrd0_shadow |= CHG_ENDOFCH; @@ -472,6 +481,14 @@ static void ascodec_read_cb(unsigned const char *data, unsigned int len) VIC_INT_ENABLE = INTERRUPT_AUDIO; } +void INT_AUDIO(void) +{ + VIC_INT_EN_CLEAR = INTERRUPT_AUDIO; + IFDEBUG(int_audio_ctr++); + + ascodec_async_read(AS3514_IRQ_ENRD0, 3, &as_audio_req, ascodec_read_cb); +} + void ascodec_wait_adc_finished(void) { wakeup_wait(&adc_wkup, TIMEOUT_BLOCK); |