Lines Matching refs:uart
157 static inline void snd_uart16550_add_timer(struct snd_uart16550 *uart)
159 if (!uart->timer_running) {
161 mod_timer(&uart->buffer_timer, jiffies + (HZ + 255) / 256);
162 uart->timer_running = 1;
166 static inline void snd_uart16550_del_timer(struct snd_uart16550 *uart)
168 if (uart->timer_running) {
169 del_timer(&uart->buffer_timer);
170 uart->timer_running = 0;
175 static inline void snd_uart16550_buffer_output(struct snd_uart16550 *uart)
177 unsigned short buff_out = uart->buff_out;
178 if (uart->buff_in_count > 0) {
179 outb(uart->tx_buff[buff_out], uart->base + UART_TX);
180 uart->fifo_count++;
183 uart->buff_out = buff_out;
184 uart->buff_in_count--;
192 static void snd_uart16550_io_loop(struct snd_uart16550 * uart)
198 substream = uart->prev_in;
201 while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
203 c = inb(uart->base + UART_RX);
207 uart->rstatus = c;
210 if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
211 if (uart->rstatus == 0xf5) {
217 uart->rstatus = 0;
218 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN)
219 && uart->midi_input[substream])
220 snd_rawmidi_receive(uart->midi_input[substream],
222 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) &&
223 uart->midi_input[substream])
224 snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
229 uart->rmidi->name, uart->base);
233 uart->prev_in = substream;
239 uart->fifo_count = 0;
240 if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
241 || uart->adaptor == SNDRV_SERIAL_GENERIC) {
243 status = inb(uart->base + UART_MSR);
244 while (uart->fifo_count == 0 && (status & UART_MSR_CTS) &&
245 uart->buff_in_count > 0) {
246 snd_uart16550_buffer_output(uart);
247 status = inb(uart->base + UART_MSR);
251 while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
252 && uart->buff_in_count > 0) /* Do we want to? */
253 snd_uart16550_buffer_output(uart);
255 if (uart->irq < 0 && uart->buff_in_count > 0)
256 snd_uart16550_add_timer(uart);
281 struct snd_uart16550 *uart;
283 uart = dev_id;
284 spin_lock(&uart->open_lock);
285 if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
286 spin_unlock(&uart->open_lock);
290 inb(uart->base + UART_IIR);
291 snd_uart16550_io_loop(uart);
292 spin_unlock(&uart->open_lock);
300 struct snd_uart16550 *uart;
302 uart = from_timer(uart, t, buffer_timer);
303 spin_lock_irqsave(&uart->open_lock, flags);
304 snd_uart16550_del_timer(uart);
305 snd_uart16550_io_loop(uart);
306 spin_unlock_irqrestore(&uart->open_lock, flags);
310 * this method probes, if an uart sits on given port
314 static int snd_uart16550_detect(struct snd_uart16550 *uart)
316 unsigned long io_base = uart->base;
320 /* Do some vague tests for the presence of the uart */
325 if (!devm_request_region(uart->card->dev, io_base, 8, "Serial MIDI")) {
330 /* uart detected unless one of the following tests should fail */
356 static void snd_uart16550_do_open(struct snd_uart16550 * uart)
361 uart->buff_in_count = 0;
362 uart->buff_in = 0;
363 uart->buff_out = 0;
364 uart->fifo_limit = 1;
365 uart->fifo_count = 0;
366 uart->timer_running = 0;
375 ,uart->base + UART_FCR); /* FIFO Control Register */
377 if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
378 uart->fifo_limit = 16;
379 if (uart->divisor != 0) {
380 uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
382 ,uart->base + UART_LCR); /* Line Control Register */
383 uart->old_divisor_lsb = inb(uart->base + UART_DLL);
384 uart->old_divisor_msb = inb(uart->base + UART_DLM);
386 outb(uart->divisor
387 ,uart->base + UART_DLL); /* Divisor Latch Low */
389 ,uart->base + UART_DLM); /* Divisor Latch High */
397 ,uart->base + UART_LCR); /* Line Control Register */
399 switch (uart->adaptor) {
406 ,uart->base + UART_MCR); /* Modem Control Register */
413 uart->base + UART_MCR);
419 uart->base + UART_MCR);
423 if (uart->irq < 0) {
427 } else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
431 } else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
441 outb(byte, uart->base + UART_IER); /* Interrupt enable Register */
443 inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
444 inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
445 inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
448 static void snd_uart16550_do_close(struct snd_uart16550 * uart)
450 if (uart->irq < 0)
451 snd_uart16550_del_timer(uart);
459 ,uart->base + UART_IER); /* Interrupt enable Register */
461 switch (uart->adaptor) {
466 ,uart->base + UART_MCR); /* Modem Control Register */
473 uart->base + UART_MCR);
479 uart->base + UART_MCR);
483 inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
486 if (uart->divisor != 0) {
488 ,uart->base + UART_LCR); /* Line Control Register */
489 outb(uart->old_divisor_lsb
490 ,uart->base + UART_DLL); /* Divisor Latch Low */
491 outb(uart->old_divisor_msb
492 ,uart->base + UART_DLM); /* Divisor Latch High */
494 outb(uart->old_line_ctrl_reg
495 ,uart->base + UART_LCR); /* Line Control Register */
502 struct snd_uart16550 *uart = substream->rmidi->private_data;
504 spin_lock_irqsave(&uart->open_lock, flags);
505 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
506 snd_uart16550_do_open(uart);
507 uart->filemode |= SERIAL_MODE_INPUT_OPEN;
508 uart->midi_input[substream->number] = substream;
509 spin_unlock_irqrestore(&uart->open_lock, flags);
516 struct snd_uart16550 *uart = substream->rmidi->private_data;
518 spin_lock_irqsave(&uart->open_lock, flags);
519 uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
520 uart->midi_input[substream->number] = NULL;
521 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
522 snd_uart16550_do_close(uart);
523 spin_unlock_irqrestore(&uart->open_lock, flags);
531 struct snd_uart16550 *uart = substream->rmidi->private_data;
533 spin_lock_irqsave(&uart->open_lock, flags);
535 uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED;
537 uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
538 spin_unlock_irqrestore(&uart->open_lock, flags);
544 struct snd_uart16550 *uart = substream->rmidi->private_data;
546 spin_lock_irqsave(&uart->open_lock, flags);
547 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
548 snd_uart16550_do_open(uart);
549 uart->filemode |= SERIAL_MODE_OUTPUT_OPEN;
550 uart->midi_output[substream->number] = substream;
551 spin_unlock_irqrestore(&uart->open_lock, flags);
558 struct snd_uart16550 *uart = substream->rmidi->private_data;
560 spin_lock_irqsave(&uart->open_lock, flags);
561 uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
562 uart->midi_output[substream->number] = NULL;
563 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
564 snd_uart16550_do_close(uart);
565 spin_unlock_irqrestore(&uart->open_lock, flags);
569 static inline int snd_uart16550_buffer_can_write(struct snd_uart16550 *uart,
572 if (uart->buff_in_count + Num < TX_BUFF_SIZE)
578 static inline int snd_uart16550_write_buffer(struct snd_uart16550 *uart,
581 unsigned short buff_in = uart->buff_in;
582 if (uart->buff_in_count < TX_BUFF_SIZE) {
583 uart->tx_buff[buff_in] = byte;
586 uart->buff_in = buff_in;
587 uart->buff_in_count++;
588 if (uart->irq < 0) /* polling mode */
589 snd_uart16550_add_timer(uart);
595 static int snd_uart16550_output_byte(struct snd_uart16550 *uart,
599 if (uart->buff_in_count == 0 /* Buffer empty? */
600 && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
601 uart->adaptor != SNDRV_SERIAL_GENERIC) ||
602 (uart->fifo_count == 0 /* FIFO empty? */
603 && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
606 if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
608 uart->fifo_count = 1;
609 outb(midi_byte, uart->base + UART_TX);
611 if (uart->fifo_count < uart->fifo_limit) {
612 uart->fifo_count++;
613 outb(midi_byte, uart->base + UART_TX);
617 snd_uart16550_write_buffer(uart, midi_byte);
621 if (!snd_uart16550_write_buffer(uart, midi_byte)) {
624 uart->rmidi->name, uart->base);
636 struct snd_uart16550 *uart = substream->rmidi->private_data;
645 spin_lock_irqsave(&uart->open_lock, flags);
647 if (uart->irq < 0) /* polling */
648 snd_uart16550_io_loop(uart);
650 if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
654 if (uart->buff_in_count > TX_BUFF_SIZE - 2)
668 snd_uart16550_output_byte(uart, substream, addr_byte);
670 snd_uart16550_output_byte(uart, substream, midi_byte);
678 (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS ||
679 uart->adaptor == SNDRV_SERIAL_GENERIC) &&
680 (uart->prev_out != substream->number ||
683 if (snd_uart16550_buffer_can_write(uart, 3)) {
687 * in this uart, send the change part
690 uart->prev_out = substream->number;
692 snd_uart16550_output_byte(uart, substream,
695 snd_uart16550_output_byte(uart, substream,
696 uart->prev_out + 1);
700 uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS)
701 snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
702 } else if (!uart->drop_on_full)
708 if (!snd_uart16550_output_byte(uart, substream, midi_byte) &&
709 !uart->drop_on_full )
713 uart->prev_status[uart->prev_out] = midi_byte;
720 spin_unlock_irqrestore(&uart->open_lock, flags);
727 struct snd_uart16550 *uart = substream->rmidi->private_data;
729 spin_lock_irqsave(&uart->open_lock, flags);
731 uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED;
733 uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
734 spin_unlock_irqrestore(&uart->open_lock, flags);
762 struct snd_uart16550 *uart;
766 uart = devm_kzalloc(card->dev, sizeof(*uart), GFP_KERNEL);
767 if (!uart)
769 uart->adaptor = adaptor;
770 uart->card = card;
771 spin_lock_init(&uart->open_lock);
772 uart->irq = -1;
773 uart->base = iobase;
774 uart->drop_on_full = droponfull;
776 err = snd_uart16550_detect(uart);
784 0, "Serial MIDI", uart)) {
788 uart->irq = irq;
791 uart->divisor = base / speed;
792 uart->speed = base / (unsigned int)uart->divisor;
793 uart->speed_base = base;
794 uart->prev_out = -1;
795 uart->prev_in = 0;
796 uart->rstatus = 0;
797 memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
798 timer_setup(&uart->buffer_timer, snd_uart16550_buffer_timer, 0);
799 uart->timer_running = 0;
801 switch (uart->adaptor) {
806 outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR);
811 outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR);
818 *ruart = uart;
832 static int snd_uart16550_rmidi(struct snd_uart16550 *uart, int device,
839 err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device,
853 rrawmidi->private_data = uart;
862 struct snd_uart16550 *uart;
912 &uart);
916 err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi);
922 adaptor_names[uart->adaptor],
923 uart->base,
924 uart->irq);