Lines Matching +full:send +full:- +full:empty
1 // SPDX-License-Identifier: GPL-2.0-or-later
12 * Added support for the Midiator MS-124T and for the MS-124W in
17 * More documentation can be found in serial-u16550.txt.
39 #define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */
40 #define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */
41 #define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */
46 "MS-124T",
47 "MS-124W S/A",
48 "MS-124W M/B",
53 #define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */
55 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
60 static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */
61 static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */
62 static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
63 static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
64 static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS};
65 static bool droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF };
86 MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode");
91 /*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */
97 #define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
159 if (!uart->timer_running) {
161 mod_timer(&uart->buffer_timer, jiffies + (HZ + 255) / 256);
162 uart->timer_running = 1;
168 if (uart->timer_running) {
169 timer_delete(&uart->buffer_timer);
170 uart->timer_running = 0;
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--;
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) {
213 substream = c - 1;
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) {
242 /* Can't use FIFO, must send only when CTS is true */
243 status = inb(uart->base + UART_MSR);
244 while (uart->fifo_count == 0 && (status & UART_MSR_CTS) &&
245 uart->buff_in_count > 0) {
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? */
255 if (uart->irq < 0 && uart->buff_in_count > 0)
260 * ---------------------------
277 * interrupts at all. (Possibly tied to an internal pull-up on CTS?)
284 guard(spinlock)(&uart->open_lock);
285 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
288 inb(uart->base + UART_IIR);
299 guard(spinlock_irqsave)(&uart->open_lock);
311 unsigned long io_base = uart->base;
317 return -ENODEV; /* Not configured */
320 if (!devm_request_region(uart->card->dev, io_base, 8, "Serial MIDI")) {
321 dev_err(uart->card->dev,
323 return -EBUSY;
328 /* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
357 uart->buff_in_count = 0;
358 uart->buff_in = 0;
359 uart->buff_out = 0;
360 uart->fifo_limit = 1;
361 uart->fifo_count = 0;
362 uart->timer_running = 0;
367 | UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
368 /* NOTE: interrupt generated after T=(time)4-bytes
371 ,uart->base + UART_FCR); /* FIFO Control Register */
373 if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
374 uart->fifo_limit = 16;
375 if (uart->divisor != 0) {
376 uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
378 ,uart->base + UART_LCR); /* Line Control Register */
379 uart->old_divisor_lsb = inb(uart->base + UART_DLL);
380 uart->old_divisor_msb = inb(uart->base + UART_DLM);
382 outb(uart->divisor
383 ,uart->base + UART_DLL); /* Divisor Latch Low */
385 ,uart->base + UART_DLM); /* Divisor Latch High */
389 outb(UART_LCR_WLEN8 /* 8 data-bits */
390 | 0 /* 1 stop-bit */
393 ,uart->base + UART_LCR); /* Line Control Register */
395 switch (uart->adaptor) {
397 outb(UART_MCR_RTS /* Set Request-To-Send line active */
398 | UART_MCR_DTR /* Set Data-Terminal-Ready line active */
399 | UART_MCR_OUT2 /* Set OUT2 - not always required, but when
402 ,uart->base + UART_MCR); /* Modem Control Register */
406 /* MS-124W can draw power from RTS and DTR if they
409 uart->base + UART_MCR);
412 /* MS-124T can draw power from RTS and/or DTR (preferably
415 uart->base + UART_MCR);
419 if (uart->irq < 0) {
421 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
423 } else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
427 } else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
430 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
434 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
437 outb(byte, uart->base + UART_IER); /* Interrupt enable Register */
439 inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
440 inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
441 inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
446 if (uart->irq < 0)
449 /* NOTE: may need to disable interrupts before de-registering out handler.
454 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
455 ,uart->base + UART_IER); /* Interrupt enable Register */
457 switch (uart->adaptor) {
459 outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */
460 |(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */
462 ,uart->base + UART_MCR); /* Modem Control Register */
466 /* MS-124W can draw power from RTS and DTR if they
469 uart->base + UART_MCR);
472 /* MS-124T can draw power from RTS and/or DTR (preferably
475 uart->base + UART_MCR);
479 inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
482 if (uart->divisor != 0) {
484 ,uart->base + UART_LCR); /* Line Control Register */
485 outb(uart->old_divisor_lsb
486 ,uart->base + UART_DLL); /* Divisor Latch Low */
487 outb(uart->old_divisor_msb
488 ,uart->base + UART_DLM); /* Divisor Latch High */
490 outb(uart->old_line_ctrl_reg
491 ,uart->base + UART_LCR); /* Line Control Register */
497 struct snd_uart16550 *uart = substream->rmidi->private_data;
499 guard(spinlock_irqsave)(&uart->open_lock);
500 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
502 uart->filemode |= SERIAL_MODE_INPUT_OPEN;
503 uart->midi_input[substream->number] = substream;
509 struct snd_uart16550 *uart = substream->rmidi->private_data;
511 guard(spinlock_irqsave)(&uart->open_lock);
512 uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
513 uart->midi_input[substream->number] = NULL;
514 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
522 struct snd_uart16550 *uart = substream->rmidi->private_data;
524 guard(spinlock_irqsave)(&uart->open_lock);
526 uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED;
528 uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
533 struct snd_uart16550 *uart = substream->rmidi->private_data;
535 guard(spinlock_irqsave)(&uart->open_lock);
536 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
538 uart->filemode |= SERIAL_MODE_OUTPUT_OPEN;
539 uart->midi_output[substream->number] = substream;
545 struct snd_uart16550 *uart = substream->rmidi->private_data;
547 guard(spinlock_irqsave)(&uart->open_lock);
548 uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
549 uart->midi_output[substream->number] = NULL;
550 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
558 if (uart->buff_in_count + Num < TX_BUFF_SIZE)
567 unsigned short buff_in = uart->buff_in;
568 if (uart->buff_in_count < TX_BUFF_SIZE) {
569 uart->tx_buff[buff_in] = byte;
572 uart->buff_in = buff_in;
573 uart->buff_in_count++;
574 if (uart->irq < 0) /* polling mode */
585 if (uart->buff_in_count == 0 /* Buffer empty? */
586 && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
587 uart->adaptor != SNDRV_SERIAL_GENERIC) ||
588 (uart->fifo_count == 0 /* FIFO empty? */
589 && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
591 /* Tx Buffer Empty - try to write immediately */
592 if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
593 /* Transmitter holding register (and Tx FIFO) empty */
594 uart->fifo_count = 1;
595 outb(midi_byte, uart->base + UART_TX);
597 if (uart->fifo_count < uart->fifo_limit) {
598 uart->fifo_count++;
599 outb(midi_byte, uart->base + UART_TX);
601 /* Cannot write (buffer empty) -
608 dev_warn(uart->card->dev,
610 uart->rmidi->name, uart->base);
621 struct snd_uart16550 *uart = substream->rmidi->private_data;
630 guard(spinlock_irqsave)(&uart->open_lock);
632 if (uart->irq < 0) /* polling */
635 if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
639 if (uart->buff_in_count > TX_BUFF_SIZE - 2)
645 addr_byte = (1 << (substream->number + 4)) | 0x08;
648 addr_byte = (substream->number << 4) | 0x08;
654 /* send midi byte */
660 /* Also send F5 after 3 seconds with no data
663 (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS ||
664 uart->adaptor == SNDRV_SERIAL_GENERIC) &&
665 (uart->prev_out != substream->number ||
672 * in this uart, send the change part
675 uart->prev_out = substream->number;
681 uart->prev_out + 1);
683 * send the previous status byte */
685 uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS)
686 snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
687 } else if (!uart->drop_on_full)
692 /* send midi byte */
694 !uart->drop_on_full )
698 uart->prev_status[uart->prev_out] = midi_byte;
710 struct snd_uart16550 *uart = substream->rmidi->private_data;
712 scoped_guard(spinlock_irqsave, &uart->open_lock) {
714 uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED;
716 uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
749 uart = devm_kzalloc(card->dev, sizeof(*uart), GFP_KERNEL);
751 return -ENOMEM;
752 uart->adaptor = adaptor;
753 uart->card = card;
754 spin_lock_init(&uart->open_lock);
755 uart->irq = -1;
756 uart->base = iobase;
757 uart->drop_on_full = droponfull;
761 dev_err(card->dev, "no UART detected at 0x%lx\n", iobase);
762 return -ENODEV;
766 if (devm_request_irq(card->dev, irq, snd_uart16550_interrupt,
768 dev_warn(card->dev,
771 uart->irq = irq;
774 uart->divisor = base / speed;
775 uart->speed = base / (unsigned int)uart->divisor;
776 uart->speed_base = base;
777 uart->prev_out = -1;
778 uart->prev_in = 0;
779 uart->rstatus = 0;
780 memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
781 timer_setup(&uart->buffer_timer, snd_uart16550_buffer_timer, 0);
782 uart->timer_running = 0;
784 switch (uart->adaptor) {
787 /* MS-124W can draw power from RTS and DTR if they
789 outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR);
792 /* MS-124T can draw power from RTS and/or DTR (preferably
794 outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR);
810 list_for_each_entry(substream, &stream->substreams, list) {
811 sprintf(substream->name, "Serial MIDI %d", substream->number + 1);
822 err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device,
830 strscpy(rrawmidi->name, "Serial MIDI");
831 snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
832 snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
833 rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
836 rrawmidi->private_data = uart;
847 int dev = devptr->id;
865 dev_err(&devptr->dev,
866 "Adaptor type is out of range 0-%d (%d)\n",
868 return -ENODEV;
872 dev_err(&devptr->dev,
873 "Count of outputs is out of range 1-%d (%d)\n",
875 return -ENODEV;
879 dev_err(&devptr->dev,
880 "Count of inputs is out of range 1-%d (%d)\n",
882 return -ENODEV;
885 err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
890 strscpy(card->driver, "Serial");
891 strscpy(card->shortname, "Serial MIDI (UART16550A)");
899 err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi);
903 sprintf(card->longname, "%s [%s] at %#lx, irq %d",
904 card->shortname,
905 adaptor_names[uart->adaptor],
906 uart->base,
907 uart->irq);
964 return -ENODEV;