static void ambauart_int(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_info *info = dev_id;
unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
status = UART_GET_INT_STATUS(info->port);
do {
if (status & (AMBA_UARTIIR_RTIS | AMBA_UARTIIR_RIS))
#ifdef SUPPORT_SYSRQ
ambauart_rx_chars(info, regs);
#else
ambauart_rx_chars(info);
#endif
if (status & AMBA_UARTIIR_TIS)
ambauart_tx_chars(info);
if (status & AMBA_UARTIIR_MIS)
ambauart_modem_status(info);
if (pass_counter-- == 0)
break;
status = UART_GET_INT_STATUS(info->port);
} while (status & (AMBA_UARTIIR_RTIS | AMBA_UARTIIR_RIS |
AMBA_UARTIIR_TIS));
}
static void ambauart_int(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_port *port = dev_id;
struct uart_info *info = port->info;
unsigned int status, ier, old_ier, count, lsr;
old_ier = UART_GET_IER(port);
UART_PUT_IER(port, (old_ier & 0xFFFFF0FF));
status = UART_GET_INT_STATUS(port);
lsr = UART_GET_LSR(port);
/* KS8695_INTMASK_UART_RX is not set during breakpoint as it should (looks
* like a HW bug), so we specifically check for a breakpoint condition in
* the UART line status register.
* Some bits from the UART line status register are cleared only when they
* are read by CPU. That is why we cannot read the line status register
* twice, and should pass the first read as argument to ambauart_rx_chars.
* Refer to CENTAUR KS8695PX's Register Description document:
* KS8695PX_REG_DESCP_v1.0.pdf, page 58: "UART Line Status Register".
*/
if (status & KS8695_INTMASK_UART_RX || lsr & KS8695_UART_LINES_BE)
{
#ifdef SUPPORT_SYSRQ
ambauart_rx_chars(port, regs, lsr);
#else
ambauart_rx_chars(port, lsr);
#endif
}
if (status & KS8695_INTMASK_UART_TX)
{
if (port->x_char)
{
UART_CLR_INT_STATUS(port, KS8695_INTMASK_UART_TX);
UART_PUT_CHAR(port, (u_int) port->x_char);
port->icount.tx++;
port->x_char = 0;
ier = UART_GET_IER(port);
ier &= 0xFFFFFEFF;
UART_PUT_IER(port, ier);
printk("XOn/Off sent\n");
return;
}
for ( count = 0; count < 16; count++)
{
if (info->xmit.head == info->xmit.tail)
{
/*ier = UART_GET_IER(port);
ier &= 0xFFFFFEFF;
UART_PUT_IER(port, ier);*/
break;
}
UART_CLR_INT_STATUS(port, KS8695_INTMASK_UART_TX);
UART_PUT_CHAR(port, (u_int) (info->xmit.buf[info->xmit.tail]));
info->xmit.tail = (info->xmit.tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
};
if (CIRC_CNT(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (info->xmit.head == info->xmit.tail)
{
ier = UART_GET_IER(port);
ier &= 0xFFFFFEFF;
UART_PUT_IER(port, ier);
}
}
if (status & KS8695_INTMASK_UART_MODEMS)
{
ambauart_modem_status(port);
}
if (status & KS8695_INTMASK_UART_MODEMS)
{
ambauart_modem_status(port);
}
if ( status & KS8695_INTMASK_UART_LINE_ERR)
{
UART_GET_LSR(port);
}
if (info->xmit.head == info->xmit.tail)
UART_PUT_IER(port, (old_ier & 0xFFFFFEFF));
else
UART_PUT_IER(port, old_ier | KS8695_INTMASK_UART_TX);
}
