/**
* i2c_pnx_xfer - generic transfer entry point
* @adap: pointer to I2C adapter structure
* @msgs: array of messages
* @num: number of messages
*
* Initiates the transfer
*/
static int
i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
struct i2c_msg *pmsg;
int rc = 0, completed = 0, i;
struct i2c_pnx_algo_data *alg_data = adap->algo_data;
u32 stat = ioread32(I2C_REG_STS(alg_data));
dev_dbg(&alg_data->adapter.dev,
"%s(): entering: %d messages, stat = %04x.\n",
__func__, num, ioread32(I2C_REG_STS(alg_data)));
bus_reset_if_active(alg_data);
/* Process transactions in a loop. */
for (i = 0; rc >= 0 && i < num; i++) {
u8 addr;
pmsg = &msgs[i];
addr = pmsg->addr;
if (pmsg->flags & I2C_M_TEN) {
dev_err(&alg_data->adapter.dev,
"%s: 10 bits addr not supported!\n",
alg_data->adapter.name);
rc = -EINVAL;
break;
}
alg_data->mif.buf = pmsg->buf;
alg_data->mif.len = pmsg->len;
alg_data->mif.order = pmsg->len;
alg_data->mif.mode = (pmsg->flags & I2C_M_RD) ?
I2C_SMBUS_READ : I2C_SMBUS_WRITE;
alg_data->mif.ret = 0;
alg_data->last = (i == num - 1);
dev_dbg(&alg_data->adapter.dev, "%s(): mode %d, %d bytes\n",
__func__, alg_data->mif.mode, alg_data->mif.len);
i2c_pnx_arm_timer(alg_data);
/* initialize the completion var */
init_completion(&alg_data->mif.complete);
/* Enable master interrupt */
iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_afie |
mcntrl_naie | mcntrl_drmie,
I2C_REG_CTL(alg_data));
/* Put start-code and slave-address on the bus. */
rc = i2c_pnx_start(addr, alg_data);
if (rc < 0)
break;
/* Wait for completion */
wait_for_completion(&alg_data->mif.complete);
if (!(rc = alg_data->mif.ret))
completed++;
dev_dbg(&alg_data->adapter.dev,
"%s(): Complete, return code = %d.\n",
__func__, rc);
/* Clear TDI and AFI bits in case they are set. */
if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_tdi) {
dev_dbg(&alg_data->adapter.dev,
"%s: TDI still set... clearing now.\n",
alg_data->adapter.name);
iowrite32(stat, I2C_REG_STS(alg_data));
}
if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_afi) {
dev_dbg(&alg_data->adapter.dev,
"%s: AFI still set... clearing now.\n",
alg_data->adapter.name);
iowrite32(stat, I2C_REG_STS(alg_data));
}
}
bus_reset_if_active(alg_data);
/* Cleanup to be sure... */
alg_data->mif.buf = NULL;
alg_data->mif.len = 0;
alg_data->mif.order = 0;
dev_dbg(&alg_data->adapter.dev, "%s(): exiting, stat = %x\n",
__func__, ioread32(I2C_REG_STS(alg_data)));
if (completed != num)
return ((rc < 0) ? rc : -EREMOTEIO);
return num;
}
/*
* Generic transfer entrypoint
*/
static int
i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
{
struct i2c_msg *pmsg;
int rc = 0, completed = 0, i;
i2c_pnx_algo_data_t * alg_data = (i2c_pnx_algo_data_t *) adap->algo_data;
pr_debug ("%s: Entered\n", __FUNCTION__);
/* Give an error if we're suspended. */
if (adap->dev.parent->power.power_state)
return -EBUSY;
down(&alg_data->mif.sem);
/* If the bus is still active, or there is already
* data in one of the fifo's, there is something wrong.
* Repair this by a reset ...
*/
if ((alg_data->master->sts & mstatus_active)) {
alg_data->master->ctl |= mcntrl_reset;
while (alg_data->master->ctl & mcntrl_reset);
} else if (!(alg_data->master->sts & mstatus_rfe) ||
!(alg_data->master->sts & mstatus_tfe)) {
printk(KERN_ERR
"%s: FIFO's contain already data before xfer. Reset it ...\n",
adap->name);
alg_data->master->ctl |= mcntrl_reset;
while (alg_data->master->ctl & mcntrl_reset);
}
/* Process transactions in a loop. */
for (i = 0; rc >= 0 && i < num;) {
u8 addr;
pmsg = &msgs[i++];
addr = pmsg->addr;
if (pmsg->flags & I2C_M_TEN) {
printk(KERN_ERR
"%s: 10 bits addr not supported !\n", adap->name);
rc = -EINVAL;
break;
}
/* Check address for sanity. */
if (alg_data->slave && addr == alg_data->slave->adr) {
printk("%s: An attempt was made to access our own slave address! :-)\n",
adap->name);
rc = -EINVAL;
break;
}
/* Set up address and r/w bit */
if (pmsg->flags & I2C_M_REV_DIR_ADDR) {
addr ^= 1;
}
alg_data->mif.buf = pmsg->buf;
alg_data->mif.len = pmsg->len;
alg_data->mif.mode = (pmsg->flags & I2C_M_RD) ? rcv : xmit;
alg_data->mif.ret = 0;
#if I2C_PNX010X_DEBUG
pr_debug("%s: %s mode, %d bytes\n", __FUNCTION__,
i2c_pnx_modestr[alg_data->mif.mode], alg_data->mif.len);
#endif
/* Arm timer */
i2c_pnx_arm_timer(&alg_data->mif.timer, (void *) alg_data);
/* initialize the completion var */
init_completion(&alg_data->mif.complete);
/* Enable master interrupt */
alg_data->master->ctl = mcntrl_afie | mcntrl_naie | mcntrl_drmie;
/* Put start-code and slave-address on the bus. */
rc = i2c_pnx_start(addr, adap);
if (0 != rc) {
break;
}
pr_debug("%s(%d): stat = %04x, cntrl = %04x.\n",
__FUNCTION__, __LINE__, alg_data->master->sts, alg_data->master->ctl);
/* Wait for completion */
wait_for_completion(&alg_data->mif.complete);
if (!(rc = alg_data->mif.ret))
completed++;
pr_debug("%s: Return code = %d.\n", __FUNCTION__, rc);
/* Clear TDI and AFI bits in case they are set. */
if (alg_data->master->sts & mstatus_tdi) {
printk("%s: TDI still set ... clearing now.\n", adap->name);
alg_data->master->sts |= mstatus_tdi;
}
if (alg_data->master->sts & mstatus_afi) {
printk("%s: AFI still set ... clearing now.\n", adap->name);
alg_data->master->sts |= mstatus_afi;
}
}
/* If the bus is still active, reset it to prevent
* corruption of future transactions.
*/
if ((alg_data->master->sts & mstatus_active)) {
printk("%s: Bus is still active after xfer. Reset it ...\n",
adap->name);
alg_data->master->ctl |= mcntrl_reset;
while (alg_data->master->ctl & mcntrl_reset);
} else
/* If there is data in the fifo's after transfer,
* flush fifo's by reset.
*/
if (!(alg_data->master->sts & mstatus_rfe) ||
!(alg_data->master->sts & mstatus_tfe)) {
alg_data->master->ctl |= mcntrl_reset;
while (alg_data->master->ctl & mcntrl_reset);
} else if ((alg_data->master->sts & mstatus_nai)) {
alg_data->master->ctl |= mcntrl_reset;
while (alg_data->master->ctl & mcntrl_reset);
}
/* Cleanup to be sure ... */
alg_data->mif.buf = NULL;
alg_data->mif.len = 0;
/* Release sem */
up(&alg_data->mif.sem);
pr_debug ("%s: Exit\n", __FUNCTION__);
if (completed != num) {
return ((rc<0) ? rc : -EREMOTEIO);
}
return num ;
}
