Lines Matching full: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);
227 dev_warn(uart->card->dev,
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);
261 * After receiving a interrupt, it is important to indicate to the UART that
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);
289 /* indicate to the UART that the interrupt has been serviced */
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")) {
326 dev_err(uart->card->dev,
331 /* uart detected unless one of the following tests should fail */
357 static void snd_uart16550_do_open(struct snd_uart16550 * uart)
362 uart->buff_in_count = 0;
363 uart->buff_in = 0;
364 uart->buff_out = 0;
365 uart->fifo_limit = 1;
366 uart->fifo_count = 0;
367 uart->timer_running = 0;
376 ,uart->base + UART_FCR); /* FIFO Control Register */
378 if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
379 uart->fifo_limit = 16;
380 if (uart->divisor != 0) {
381 uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
383 ,uart->base + UART_LCR); /* Line Control Register */
384 uart->old_divisor_lsb = inb(uart->base + UART_DLL);
385 uart->old_divisor_msb = inb(uart->base + UART_DLM);
387 outb(uart->divisor
388 ,uart->base + UART_DLL); /* Divisor Latch Low */
390 ,uart->base + UART_DLM); /* Divisor Latch High */
398 ,uart->base + UART_LCR); /* Line Control Register */
400 switch (uart->adaptor) {
407 ,uart->base + UART_MCR); /* Modem Control Register */
414 uart->base + UART_MCR);
420 uart->base + UART_MCR);
424 if (uart->irq < 0) {
428 } else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
432 } else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
442 outb(byte, uart->base + UART_IER); /* Interrupt enable Register */
444 inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
445 inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
446 inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
449 static void snd_uart16550_do_close(struct snd_uart16550 * uart)
451 if (uart->irq < 0)
452 snd_uart16550_del_timer(uart);
460 ,uart->base + UART_IER); /* Interrupt enable Register */
462 switch (uart->adaptor) {
467 ,uart->base + UART_MCR); /* Modem Control Register */
474 uart->base + UART_MCR);
480 uart->base + UART_MCR);
484 inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
487 if (uart->divisor != 0) {
489 ,uart->base + UART_LCR); /* Line Control Register */
490 outb(uart->old_divisor_lsb
491 ,uart->base + UART_DLL); /* Divisor Latch Low */
492 outb(uart->old_divisor_msb
493 ,uart->base + UART_DLM); /* Divisor Latch High */
495 outb(uart->old_line_ctrl_reg
496 ,uart->base + UART_LCR); /* Line Control Register */
503 struct snd_uart16550 *uart = substream->rmidi->private_data;
505 spin_lock_irqsave(&uart->open_lock, flags);
506 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
507 snd_uart16550_do_open(uart);
508 uart->filemode |= SERIAL_MODE_INPUT_OPEN;
509 uart->midi_input[substream->number] = substream;
510 spin_unlock_irqrestore(&uart->open_lock, flags);
517 struct snd_uart16550 *uart = substream->rmidi->private_data;
519 spin_lock_irqsave(&uart->open_lock, flags);
520 uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
521 uart->midi_input[substream->number] = NULL;
522 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
523 snd_uart16550_do_close(uart);
524 spin_unlock_irqrestore(&uart->open_lock, flags);
532 struct snd_uart16550 *uart = substream->rmidi->private_data;
534 spin_lock_irqsave(&uart->open_lock, flags);
536 uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED;
538 uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
539 spin_unlock_irqrestore(&uart->open_lock, flags);
545 struct snd_uart16550 *uart = substream->rmidi->private_data;
547 spin_lock_irqsave(&uart->open_lock, flags);
548 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
549 snd_uart16550_do_open(uart);
550 uart->filemode |= SERIAL_MODE_OUTPUT_OPEN;
551 uart->midi_output[substream->number] = substream;
552 spin_unlock_irqrestore(&uart->open_lock, flags);
559 struct snd_uart16550 *uart = substream->rmidi->private_data;
561 spin_lock_irqsave(&uart->open_lock, flags);
562 uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
563 uart->midi_output[substream->number] = NULL;
564 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
565 snd_uart16550_do_close(uart);
566 spin_unlock_irqrestore(&uart->open_lock, flags);
570 static inline int snd_uart16550_buffer_can_write(struct snd_uart16550 *uart,
573 if (uart->buff_in_count + Num < TX_BUFF_SIZE)
579 static inline int snd_uart16550_write_buffer(struct snd_uart16550 *uart,
582 unsigned short buff_in = uart->buff_in;
583 if (uart->buff_in_count < TX_BUFF_SIZE) {
584 uart->tx_buff[buff_in] = byte;
587 uart->buff_in = buff_in;
588 uart->buff_in_count++;
589 if (uart->irq < 0) /* polling mode */
590 snd_uart16550_add_timer(uart);
596 static int snd_uart16550_output_byte(struct snd_uart16550 *uart,
600 if (uart->buff_in_count == 0 /* Buffer empty? */
601 && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
602 uart->adaptor != SNDRV_SERIAL_GENERIC) ||
603 (uart->fifo_count == 0 /* FIFO empty? */
604 && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
607 if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
609 uart->fifo_count = 1;
610 outb(midi_byte, uart->base + UART_TX);
612 if (uart->fifo_count < uart->fifo_limit) {
613 uart->fifo_count++;
614 outb(midi_byte, uart->base + UART_TX);
618 snd_uart16550_write_buffer(uart, midi_byte);
622 if (!snd_uart16550_write_buffer(uart, midi_byte)) {
623 dev_warn(uart->card->dev,
625 uart->rmidi->name, uart->base);
637 struct snd_uart16550 *uart = substream->rmidi->private_data;
646 spin_lock_irqsave(&uart->open_lock, flags);
648 if (uart->irq < 0) /* polling */
649 snd_uart16550_io_loop(uart);
651 if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
655 if (uart->buff_in_count > TX_BUFF_SIZE - 2)
669 snd_uart16550_output_byte(uart, substream, addr_byte);
671 snd_uart16550_output_byte(uart, substream, midi_byte);
679 (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS ||
680 uart->adaptor == SNDRV_SERIAL_GENERIC) &&
681 (uart->prev_out != substream->number ||
684 if (snd_uart16550_buffer_can_write(uart, 3)) {
688 * in this uart, send the change part
691 uart->prev_out = substream->number;
693 snd_uart16550_output_byte(uart, substream,
696 snd_uart16550_output_byte(uart, substream,
697 uart->prev_out + 1);
701 uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS)
702 snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
703 } else if (!uart->drop_on_full)
709 if (!snd_uart16550_output_byte(uart, substream, midi_byte) &&
710 !uart->drop_on_full )
714 uart->prev_status[uart->prev_out] = midi_byte;
721 spin_unlock_irqrestore(&uart->open_lock, flags);
728 struct snd_uart16550 *uart = substream->rmidi->private_data;
730 spin_lock_irqsave(&uart->open_lock, flags);
732 uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED;
734 uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
735 spin_unlock_irqrestore(&uart->open_lock, flags);
763 struct snd_uart16550 *uart;
767 uart = devm_kzalloc(card->dev, sizeof(*uart), GFP_KERNEL);
768 if (!uart)
770 uart->adaptor = adaptor;
771 uart->card = card;
772 spin_lock_init(&uart->open_lock);
773 uart->irq = -1;
774 uart->base = iobase;
775 uart->drop_on_full = droponfull;
777 err = snd_uart16550_detect(uart);
779 dev_err(card->dev, "no UART detected at 0x%lx\n", iobase);
785 0, "Serial MIDI", uart)) {
789 uart->irq = irq;
792 uart->divisor = base / speed;
793 uart->speed = base / (unsigned int)uart->divisor;
794 uart->speed_base = base;
795 uart->prev_out = -1;
796 uart->prev_in = 0;
797 uart->rstatus = 0;
798 memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
799 timer_setup(&uart->buffer_timer, snd_uart16550_buffer_timer, 0);
800 uart->timer_running = 0;
802 switch (uart->adaptor) {
807 outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR);
812 outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR);
819 *ruart = uart;
833 static int snd_uart16550_rmidi(struct snd_uart16550 *uart, int device,
840 err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device,
854 rrawmidi->private_data = uart;
863 struct snd_uart16550 *uart;
913 &uart);
917 err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi);
923 adaptor_names[uart->adaptor],
924 uart->base,
925 uart->irq);