/*-----------------------------------------------------------------------
* Probe to see if a chip is present using single byte read. Also good for
* checking for the completion of EEPROM writes since the chip stops
* responding until the write completes (typically 10mSec).
*/
int i2c_probe(uchar addr)
{
uint64_t data;
unsigned int bus;
#ifdef CONFIG_I2C_MULTI_BUS
bus = gd->ogd.current_i2c_bus;
#else
bus = 0;
#endif
if (cvmx_twsix_read(bus, addr, 1, &data) < 0)
return (1);
else
return (0); /* probed OK */
}
/**
* Do a twsi read from a 7 bit device address using an (optional) internal address.
* Up to 8 bytes can be read at a time.
*
* @param twsi_id which Octeon TWSI bus to use
* @param dev_addr Device address (7 bit)
* @param internal_addr
* Internal address. Can be 0, 1 or 2 bytes in width
* @param num_bytes Number of data bytes to read
* @param ia_width_bytes
* Internal address size in bytes (0, 1, or 2)
* @param data Pointer argument where the read data is returned.
*
* @return read data returned in 'data' argument
* Number of bytes read on success
* -1 on failure
*/
int cvmx_twsix_read_ia(int twsi_id, uint8_t dev_addr, uint16_t internal_addr, int num_bytes, int ia_width_bytes, uint64_t *data)
{
#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
# if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
struct i2c_adapter *adapter;
u8 data_buf[8];
u8 addr_buf[8];
struct i2c_msg msg[2];
uint64_t r;
int i, j;
if (ia_width_bytes == 0)
return cvmx_twsix_read(twsi_id, dev_addr, num_bytes, data);
BUG_ON(ia_width_bytes > 2);
BUG_ON(num_bytes > 8 || num_bytes < 1);
adapter = __cvmx_twsix_get_adapter(twsi_id);
if (adapter == NULL)
return -1;
for (j = 0, i = ia_width_bytes - 1; i >= 0; i--, j++)
addr_buf[j] = (u8)(internal_addr >> (i * 8));
msg[0].addr = dev_addr;
msg[0].flags = 0;
msg[0].len = ia_width_bytes;
msg[0].buf = addr_buf;
msg[1].addr = dev_addr;
msg[1].flags = I2C_M_RD;
msg[1].len = num_bytes;
msg[1].buf = data_buf;
i = i2c_transfer(adapter, msg, 2);
i2c_put_adapter(adapter);
if (i == 2) {
r = 0;
for (i = 0; i < num_bytes; i++)
r = (r << 8) | data_buf[i];
*data = r;
return num_bytes;
} else {
return -1;
}
# else
BUG(); /* The I2C driver is not compiled in */
# endif
#else
cvmx_mio_twsx_sw_twsi_t sw_twsi_val;
cvmx_mio_twsx_sw_twsi_ext_t twsi_ext;
if (num_bytes < 1 || num_bytes > 8 || !data || ia_width_bytes < 0 || ia_width_bytes > 2)
return -1;
twsi_ext.u64 = 0;
sw_twsi_val.u64 = 0;
sw_twsi_val.s.v = 1;
sw_twsi_val.s.r = 1;
sw_twsi_val.s.sovr = 1;
sw_twsi_val.s.size = num_bytes - 1;
sw_twsi_val.s.a = dev_addr;
if (ia_width_bytes > 0) {
sw_twsi_val.s.op = 1;
sw_twsi_val.s.ia = (internal_addr >> 3) & 0x1f;
sw_twsi_val.s.eop_ia = internal_addr & 0x7;
}
