/*
* Write to SMBus
*/
static int
bcm1250_smbus_write(int smb_chan, UINT8 slave, UINT8 *buf, int len)
{
int err;
/*
* Make sure the bus is idle (ignore error here)
*/
bcm1250_smbus_waitready(smb_chan);
/*
* Depending on how many bytes we're writing, fill in the various
* SMB registers and execute the command.
*/
switch (len) {
case 1: /* "command" byte alone */
SBWRITECSR(A_SMB_REGISTER(smb_chan, R_SMB_CMD), buf[0]);
SBWRITECSR(A_SMB_REGISTER(smb_chan, R_SMB_START),
V_SMB_TT(K_SMB_TT_WR1BYTE) | ((UINT64)slave));
break;
case 2: /* "command" byte plus a data byte */
SBWRITECSR(A_SMB_REGISTER(smb_chan, R_SMB_CMD), buf[0]);
SBWRITECSR(A_SMB_REGISTER(smb_chan, R_SMB_DATA), buf[1]);
SBWRITECSR(A_SMB_REGISTER(smb_chan, R_SMB_START),
V_SMB_TT(K_SMB_TT_WR2BYTE) | ((UINT64)slave));
break;
case 3: /* "command" byte plus 2 data bytes */
SBWRITECSR(A_SMB_REGISTER(smb_chan, R_SMB_CMD), buf[0]);
SBWRITECSR(A_SMB_REGISTER(smb_chan, R_SMB_DATA),
((UINT64)(buf[1])) | (((UINT64)buf[2]) << 8));
SBWRITECSR(A_SMB_REGISTER(smb_chan, R_SMB_START),
V_SMB_TT(K_SMB_TT_WR3BYTE) | ((UINT64)slave));
break;
default:
return -1;
break;
}
/*
* Wait for command to complete.
*/
err = bcm1250_smbus_waitready(smb_chan);
if (err < 0) return err;
return 0;
}
/*
* read from SMBus
*/
static int
bcm1250_smbus_read(int smb_chan, UINT8 slave, UINT8 *buf, int len)
{
int err;
while (len > 0) {
err = bcm1250_smbus_waitready(smb_chan);
if (err < 0) return err;
SBWRITECSR(A_SMB_REGISTER(smb_chan, R_SMB_START),
V_SMB_TT(K_SMB_TT_RD1BYTE) | ((UINT64)slave));
err = bcm1250_smbus_waitready(smb_chan);
if (err < 0) return err;
*buf++ = (UINT8) SBREADCSR(A_SMB_REGISTER(smb_chan, R_SMB_DATA));
len--;
}
return 0;
}
static int temp_smbus_write(int chan,int slaveaddr,int devaddr,int data)
{
uintptr_t reg;
int err;
/*
* Make sure the bus is idle (probably should
* ignore error here)
*/
if (temp_smbus_waitready(chan) < 0) return -1;
/*
* Write the device address to the controller. There are two
* parts, the high part goes in the "CMD" field, and the
* low part is the data field.
*/
reg = PHYS_TO_K1(A_SMB_REGISTER(chan,R_SMB_CMD));
SBWRITECSR(reg,devaddr);
/*
* Write the data byte
*/
reg = PHYS_TO_K1(A_SMB_REGISTER(chan,R_SMB_DATA));
SBWRITECSR(reg,data);
/*
* Do the write command.
*/
reg = PHYS_TO_K1(A_SMB_REGISTER(chan,R_SMB_START));
SBWRITECSR(reg,V_SMB_TT(K_SMB_TT_WR2BYTE) | slaveaddr);
err = temp_smbus_waitready(chan);
return err;
}
