static void it8709_wait(struct ite_dev *dev)
{
int i = 0;
for (i = 0; i < 15000; i++) {
udelay(2);
if (it8709_rm(dev, IT8709_MODE) == IT8709_IDLE)
break;
}
}
static int it8709_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size)
{
int fifo, read = 0;
ite_dbg("%s called", __func__);
fifo = it8709_rm(dev, IT8709_RFSR) & IT85_RXFBC;
while (fifo > 0 && buf_size > 0) {
*(buf++) = it8709_rm(dev, IT8709_FIFO + read);
fifo--;
read++;
buf_size--;
}
it8709_wm(dev, 0, IT8709_RFSR);
return read;
}
/* read the value of a CIR register */
static u8 it8709_rr(struct ite_dev *dev, int index)
{
/* just wait in case the previous access was a write */
it8709_wait(dev);
it8709_wm(dev, index, IT8709_REG_IDX);
it8709_wm(dev, IT8709_READ, IT8709_MODE);
/* wait for the read data to be available */
it8709_wait(dev);
/* return the read value */
return it8709_rm(dev, IT8709_REG_VAL);
}
static void it8709_wait(struct ite_dev *dev)
{
int i = 0;
/*
* loop until device tells it's ready to continue
* iterations count is usually ~750 but can sometimes achieve 13000
*/
for (i = 0; i < 15000; i++) {
udelay(2);
if (it8709_rm(dev, IT8709_MODE) == IT8709_IDLE)
break;
}
}
static u8 it8709_rr(struct ite_dev *dev, int index)
{
it8709_wait(dev);
it8709_wm(dev, index, IT8709_REG_IDX);
it8709_wm(dev, IT8709_READ, IT8709_MODE);
it8709_wait(dev);
return it8709_rm(dev, IT8709_REG_VAL);
}
/* read up to buf_size bytes from the RX FIFO; to be called with the spinlock
* held */
static int it8709_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size)
{
int fifo, read = 0;
ite_dbg("%s called", __func__);
/* read how many bytes are still in the FIFO */
fifo = it8709_rm(dev, IT8709_RFSR) & IT85_RXFBC;
while (fifo > 0 && buf_size > 0) {
*(buf++) = it8709_rm(dev, IT8709_FIFO + read);
fifo--;
read++;
buf_size--;
}
/* 'clear' the FIFO by setting the writing index to 0; this is
* completely bound to be racy, but we can't help it, since it's a
* limitation of the protocol */
it8709_wm(dev, 0, IT8709_RFSR);
return read;
}
/* retrieve a bitmask of the current causes for a pending interrupt; this may
* be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN
* */
static int it8709_get_irq_causes(struct ite_dev *dev)
{
u8 iflags;
int ret = 0;
ite_dbg("%s called", __func__);
/* read the interrupt flags */
iflags = it8709_rm(dev, IT8709_IIR);
if (iflags & IT85_TLDLI)
ret |= ITE_IRQ_TX_FIFO;
if (iflags & IT85_RDAI)
ret |= ITE_IRQ_RX_FIFO;
if (iflags & IT85_RFOI)
ret |= ITE_IRQ_RX_FIFO_OVERRUN;
return ret;
}
