static u32 imx_read(struct vmm_chardev *cdev,
u8 *dest, size_t len, off_t __unused *off, bool sleep)
{
u32 i;
struct imx_port *port;
if (!(cdev && dest && cdev->priv)) {
return 0;
}
port = cdev->priv;
if (sleep) {
for (i = 0; i < len; i++) {
dest[i] = imx_getc_sleepable(port);
}
} else {
for (i = 0; i < len; i++) {
if (!imx_lowlevel_can_getc(port->base)) {
break;
}
dest[i] = imx_lowlevel_getc(port->base);
}
}
return i;
}
static void imx_rxint(struct imx_port *port)
{
while (imx_lowlevel_can_getc(port->base)) {
u8 ch = imx_lowlevel_getc(port->base);
serial_rx(port->p, &ch, 1);
}
}
static int imx_defterm_getc(u8 *ch)
{
if (!imx_lowlevel_can_getc(imx_defterm_base)) {
return VMM_EFAIL;
}
*ch = imx_lowlevel_getc(imx_defterm_base);
return VMM_OK;
}
static u8 imx_getc_sleepable(struct imx_port *port)
{
/* Wait until there is data in the FIFO */
while (!imx_lowlevel_can_getc(port->base)) {
/* Enable the RX interrupt */
port->mask |= UCR1_RRDYEN;
vmm_writel(port->mask, (void *)port->base + UCR1);
/* Wait for completion */
vmm_completion_wait(&port->read_possible);
}
/* Read data to destination */
return imx_lowlevel_getc(port->base);
}
