/*
* TX interrupt handler
*/
static inline void rs_tx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long flags, status;
save_and_cli(flags);
rs_dprintk(TX3912_UART_DEBUG_INTERRUPTS, "rs_tx_interrupt...");
/* Get the interrupts */
status = inl(TX3912_INT2_STATUS);
if(!rs_port || !rs_port->gs.tty) {
restore_flags(flags);
return;
}
/* Clear interrupts */
outl(TX3912_INT2_UARTA_TX_BITS, TX3912_INT2_CLEAR);
/* TX holding register empty - transmit a byte */
if(status & TX3912_INT2_UARTAEMPTYINT) {
transmit_char_pio(rs_port);
}
/* TX Transmit Holding Register Overrun (shouldn't happen) */
if(status & TX3912_INT2_UARTATXOVERRUNINT) {
printk( "rs_tx_interrupt: TX overrun\n");
}
restore_flags(flags);
rs_dprintk(TX3912_UART_DEBUG_INTERRUPTS, "end.\n");
}
static void rs_enable_tx_interrupts (void * ptr)
{
unsigned long flags;
save_and_cli(flags);
outl(TX3912_INT2_UARTA_TX_BITS, TX3912_INT2_CLEAR);
outl(inl(TX3912_INT2_ENABLE) | TX3912_INT2_UARTA_TX_BITS,
TX3912_INT2_ENABLE);
transmit_char_pio(rs_port);
restore_flags(flags);
}
static inline void rs_tx_interrupt(int irq, void *dev_id,
struct pt_regs * regs, int intshift)
{
struct rs_port * port;
unsigned long int2status;
unsigned long flags;
unsigned long ints;
save_and_cli(flags);
port = (struct rs_port *)dev_id;
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "rs_interrupt (port %p, shift %d)...", port, intshift);
/* Get the interrrupts we have enabled */
int2status = IntStatus2 & IntEnable2;
if (!port || !port->gs.tty) {
restore_flags(flags);
return;
}
/* Get interrupts in easy to use form */
ints = int2status >> intshift;
/* Clear any interrupts we might be about to handle */
IntClear2 = int2status & (
(INTTYPE(UART_TX_INT) |
INTTYPE(UART_EMPTY_INT) |
INTTYPE(UART_TXOVERRUN_INT)) << intshift);
/* TX holding register empty, so transmit byte (non-DMA) */
if (ints & (INTTYPE(UART_TX_INT) | INTTYPE(UART_EMPTY_INT))) {
transmit_char_pio(port);
}
/* TX Transmit Holding Register Overrun (shouldn't happen) */
if (ints & INTTYPE(UART_TXOVERRUN_INT)) {
printk ( "rs: TX overrun\n");
}
/*
check_modem_status();
*/
restore_flags(flags);
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "end.\n");
}
static irqreturn_t duart_int(int irq, void *dev_id, struct pt_regs *regs)
{
uart_state_t *us = (uart_state_t *)dev_id;
struct tty_struct *tty = us->tty;
unsigned int status = READ_SERCSR(us->status, us->line);
#ifdef DUART_SPEW
printk("DUART INT\n");
#endif
if (status & M_DUART_RX_RDY) {
int counter = 2048;
unsigned int ch;
if (status & M_DUART_OVRUN_ERR)
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
if (status & M_DUART_PARITY_ERR) {
printk("Parity error!\n");
} else if (status & M_DUART_FRM_ERR) {
printk("Frame error!\n");
}
while (counter > 0) {
if (!(READ_SERCSR(us->status, us->line) & M_DUART_RX_RDY))
break;
ch = READ_SERCSR(us->rx_hold, us->line);
if (tty->flip.count < TTY_FLIPBUF_SIZE) {
*tty->flip.char_buf_ptr++ = ch;
*tty->flip.flag_buf_ptr++ = 0;
tty->flip.count++;
}
udelay(1);
counter--;
}
tty_flip_buffer_push(tty);
}
if (status & M_DUART_TX_RDY) {
transmit_char_pio(us);
}
return IRQ_HANDLED;
}
static void rs_enable_tx_interrupts (void * ptr)
{
struct rs_port *port = ptr;
unsigned long flags;
save_and_cli(flags);
IntClear2 = (INTTYPE(UART_TX_INT) |
INTTYPE(UART_EMPTY_INT) |
INTTYPE(UART_TXOVERRUN_INT)) << port->intshift;
IntEnable2 |= (INTTYPE(UART_TX_INT) |
INTTYPE(UART_EMPTY_INT) |
INTTYPE(UART_TXOVERRUN_INT)) << port->intshift;
/* Send a char to start TX interrupts happening */
transmit_char_pio(port);
restore_flags(flags);
}