diff options
Diffstat (limited to 'src/cpu/allwinner/a10/twi.c')
| -rw-r--r-- | src/cpu/allwinner/a10/twi.c | 40 |
1 files changed, 36 insertions, 4 deletions
diff --git a/src/cpu/allwinner/a10/twi.c b/src/cpu/allwinner/a10/twi.c index 692a498a36..14e5ec7d9f 100644 --- a/src/cpu/allwinner/a10/twi.c +++ b/src/cpu/allwinner/a10/twi.c @@ -109,8 +109,8 @@ static void i2c_send_stop(struct a1x_twi *twi) write32(reg32, &twi->ctl); } -int i2c_read(unsigned bus, unsigned chip, unsigned addr, - unsigned alen, uint8_t *buf, unsigned len) +static int i2c_read(unsigned bus, unsigned chip, unsigned addr, + uint8_t *buf, unsigned len) { unsigned count = len; enum twi_status expected_status; @@ -169,8 +169,8 @@ int i2c_read(unsigned bus, unsigned chip, unsigned addr, return len; } -int i2c_write(unsigned bus, unsigned chip, unsigned addr, - unsigned alen, const uint8_t *buf, unsigned len) +static int i2c_write(unsigned bus, unsigned chip, unsigned addr, + const uint8_t *buf, unsigned len) { unsigned count = len; struct a1x_twi *twi = (void *)TWI_BASE(bus); @@ -204,3 +204,35 @@ int i2c_write(unsigned bus, unsigned chip, unsigned addr, return len; } + + +/* + * This transfer function is not complete or correct, but it provides + * the basic support that the above read and write functions previously + * provided directly. It is extremely limited and not useful for + * advanced drivers like TPM. + * + * TODO: Rewite the i2c_transfer and supporting functions + * + */ +int i2c_transfer(unsigned bus, struct i2c_seg *segments, int count) +{ + struct i2c_seg *seg = segments; + + if (seg->read) { + /* Read has one buf for the addr and one for the data */ + if (count != 2) + return -1; + + if(i2c_read(bus, seg->chip, *seg->buf, seg[1].buf, seg[1].len) < 0) + return -1; + } else { + /* Write buf has adder and data. */ + if (count != 1) + return -1; + + if(i2c_write(bus, seg->chip, *seg->buf, seg->buf+1, seg->len-1) < 0) + return -1; + } + return 0; +} |