/* This loop should be called with interrupts disabled
* We don't want to interrupt this,
* as we're already handling an interupt
*/
static void snd_uart16550_io_loop(snd_uart16550_t * uart)
{
unsigned char c, status;
/* Read Loop */
while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
/* while receive data ready */
c = inb(uart->base + UART_RX);
if (uart->filemode & SERIAL_MODE_INPUT_OPEN) {
snd_rawmidi_receive(uart->midi_input, &c, 1);
}
if (status & UART_LSR_OE)
snd_printk("%s: Overrun on device at 0x%lx\n",
uart->rmidi->name, uart->base);
}
/* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
buffer is never filled. */
/* Check write status */
if (status & UART_LSR_THRE) {
uart->fifo_count = 0;
}
if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
/* Can't use FIFO, must send only when CTS is true */
status = inb(uart->base + UART_MSR);
if (uart->fifo_count == 0 && (status & UART_MSR_CTS)
&& uart->buff_in_count > 0)
snd_uart16550_buffer_output(uart);
} else {
/* Write loop */
while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
&& uart->buff_in_count > 0) /* Do we want to? */
snd_uart16550_buffer_output(uart);
}
if (uart->irq < 0 && uart->buff_in_count > 0)
snd_uart16550_add_timer(uart);
}
/* This loop should be called with interrupts disabled
* We don't want to interrupt this,
* as we're already handling an interrupt
*/
static void snd_uart16550_io_loop(snd_uart16550_t * uart)
{
unsigned char c, status;
int substream;
/* recall previous stream */
substream = uart->prev_in;
/* Read Loop */
while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
/* while receive data ready */
c = inb(uart->base + UART_RX);
/* keep track of last status byte */
if (c & 0x80) {
uart->rstatus = c;
}
/* handle stream switch */
if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
if (uart->rstatus == 0xf5) {
if (c <= SNDRV_SERIAL_MAX_INS && c > 0)
substream = c - 1;
if (c != 0xf5)
uart->rstatus = 0; /* prevent future bytes from being interpreted as streams */
}
else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) {
snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
}
} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) {
snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
}
if (status & UART_LSR_OE)
snd_printk("%s: Overrun on device at 0x%lx\n",
uart->rmidi->name, uart->base);
}
/* remember the last stream */
uart->prev_in = substream;
/* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
buffer is never filled. */
/* Check write status */
if (status & UART_LSR_THRE) {
uart->fifo_count = 0;
}
if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
|| uart->adaptor == SNDRV_SERIAL_GENERIC) {
/* Can't use FIFO, must send only when CTS is true */
status = inb(uart->base + UART_MSR);
while( (uart->fifo_count == 0) && (status & UART_MSR_CTS) &&
(uart->buff_in_count > 0) ) {
snd_uart16550_buffer_output(uart);
status = inb( uart->base + UART_MSR );
}
} else {
/* Write loop */
while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
&& uart->buff_in_count > 0) /* Do we want to? */
snd_uart16550_buffer_output(uart);
}
if (uart->irq < 0 && uart->buff_in_count > 0)
snd_uart16550_add_timer(uart);
}
