static int i2c_read(struct i2c_au1550_data *adap, unsigned char *buf,
unsigned int len)
{
int i;
if (len == 0)
return 0;
/* A read is performed by stuffing the transmit fifo with
* zero bytes for timing, waiting for bytes to appear in the
* receive fifo, then reading the bytes.
*/
i = 0;
while (i < (len - 1)) {
WR(adap, PSC_SMBTXRX, 0);
if (wait_for_rx_byte(adap, &buf[i]))
return -EIO;
i++;
}
/* The last byte has to indicate transfer done. */
WR(adap, PSC_SMBTXRX, PSC_SMBTXRX_STP);
if (wait_master_done(adap))
return -EIO;
buf[i] = (unsigned char)(RD(adap, PSC_SMBTXRX) & 0xff);
return 0;
}
static int
i2c_read(struct i2c_au1550_data *adap, unsigned char *buf,
unsigned int len)
{
int i;
u32 data;
volatile psc_smb_t *sp;
if (len == 0)
return 0;
/* A read is performed by stuffing the transmit fifo with
* zero bytes for timing, waiting for bytes to appear in the
* receive fifo, then reading the bytes.
*/
sp = (volatile psc_smb_t *)(adap->psc_base);
i = 0;
while (i < (len-1)) {
sp->psc_smbtxrx = 0;
au_sync();
if (wait_for_rx_byte(adap, &data))
return -EIO;
buf[i] = data;
i++;
}
/* The last byte has to indicate transfer done.
*/
sp->psc_smbtxrx = PSC_SMBTXRX_STP;
au_sync();
if (wait_master_done(adap))
return -EIO;
data = sp->psc_smbtxrx;
au_sync();
buf[i] = data;
return 0;
}
static int
i2c_read(struct i2c_au1550_data *adap, unsigned char *buf,
unsigned int len)
{
int i;
u32 data;
volatile psc_smb_t *sp;
if (len == 0)
return 0;
sp = (volatile psc_smb_t *)(adap->psc_base);
i = 0;
while (i < (len-1)) {
sp->psc_smbtxrx = 0;
au_sync();
if (wait_for_rx_byte(adap, &data))
return -EIO;
buf[i] = data;
i++;
}
sp->psc_smbtxrx = PSC_SMBTXRX_STP;
au_sync();
if (wait_master_done(adap))
return -EIO;
data = sp->psc_smbtxrx;
au_sync();
buf[i] = data;
return 0;
}
