2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Routines for control of MPU-401 in UART mode
5 * MPU-401 supports UART mode which is not capable generate transmit
6 * interrupts thus output is done via polling. Also, if irq < 0, then
7 * input is done also via polling. Do not expect good performance.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 * Added support for different kind of hardware I/O. Build in choices
26 * are port and mmio. For other kind of I/O, set mpu->read and
27 * mpu->write to your own I/O functions.
32 #include <linux/delay.h>
33 #include <linux/init.h>
34 #include <linux/slab.h>
35 #include <linux/ioport.h>
36 #include <linux/interrupt.h>
37 #include <linux/errno.h>
38 #include <sound/core.h>
39 #include <sound/mpu401.h>
41 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
42 MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
43 MODULE_LICENSE("GPL");
45 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
46 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
52 #define snd_mpu401_input_avail(mpu) \
53 (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY))
54 #define snd_mpu401_output_ready(mpu) \
55 (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL))
57 /* Build in lowlevel io */
58 static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
64 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
70 static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
73 writeb(data, (void __iomem *)addr);
76 static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
79 return readb((void __iomem *)addr);
83 static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
86 for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
87 mpu->read(mpu, MPU401D(mpu));
88 #ifdef CONFIG_SND_DEBUG
90 snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
91 mpu->read(mpu, MPU401C(mpu)));
95 static void uart_interrupt_tx(struct snd_mpu401 *mpu)
99 if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
100 test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
101 spin_lock_irqsave(&mpu->output_lock, flags);
102 snd_mpu401_uart_output_write(mpu);
103 spin_unlock_irqrestore(&mpu->output_lock, flags);
107 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
111 if (mpu->info_flags & MPU401_INFO_INPUT) {
112 spin_lock_irqsave(&mpu->input_lock, flags);
113 if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
114 snd_mpu401_uart_input_read(mpu);
116 snd_mpu401_uart_clear_rx(mpu);
117 spin_unlock_irqrestore(&mpu->input_lock, flags);
119 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
120 /* ok. for better Tx performance try do some output
121 when input is done */
122 uart_interrupt_tx(mpu);
126 * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
127 * @irq: the irq number
128 * @dev_id: mpu401 instance
130 * Processes the interrupt for MPU401-UART i/o.
132 irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
134 struct snd_mpu401 *mpu = dev_id;
138 _snd_mpu401_uart_interrupt(mpu);
142 EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
145 * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
146 * @irq: the irq number
147 * @dev_id: mpu401 instance
149 * Processes the interrupt for MPU401-UART output.
151 irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
153 struct snd_mpu401 *mpu = dev_id;
157 uart_interrupt_tx(mpu);
161 EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
165 * reprogram the timer and call the interrupt job
167 static void snd_mpu401_uart_timer(unsigned long data)
169 struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
172 spin_lock_irqsave(&mpu->timer_lock, flags);
173 /*mpu->mode |= MPU401_MODE_TIMER;*/
174 mpu->timer.expires = 1 + jiffies;
175 add_timer(&mpu->timer);
176 spin_unlock_irqrestore(&mpu->timer_lock, flags);
178 _snd_mpu401_uart_interrupt(mpu);
182 * initialize the timer callback if not programmed yet
184 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
188 spin_lock_irqsave (&mpu->timer_lock, flags);
189 if (mpu->timer_invoked == 0) {
190 init_timer(&mpu->timer);
191 mpu->timer.data = (unsigned long)mpu;
192 mpu->timer.function = snd_mpu401_uart_timer;
193 mpu->timer.expires = 1 + jiffies;
194 add_timer(&mpu->timer);
196 mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
197 MPU401_MODE_OUTPUT_TIMER;
198 spin_unlock_irqrestore (&mpu->timer_lock, flags);
202 * remove the timer callback if still active
204 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
208 spin_lock_irqsave (&mpu->timer_lock, flags);
209 if (mpu->timer_invoked) {
210 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
211 ~MPU401_MODE_OUTPUT_TIMER;
212 if (! mpu->timer_invoked)
213 del_timer(&mpu->timer);
215 spin_unlock_irqrestore (&mpu->timer_lock, flags);
219 * send a UART command
220 * return zero if successful, non-zero for some errors
223 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
229 spin_lock_irqsave(&mpu->input_lock, flags);
230 if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
231 mpu->write(mpu, 0x00, MPU401D(mpu));
232 /*snd_mpu401_uart_clear_rx(mpu);*/
234 /* ok. standard MPU-401 initialization */
235 if (mpu->hardware != MPU401_HW_SB) {
236 for (timeout = 1000; timeout > 0 &&
237 !snd_mpu401_output_ready(mpu); timeout--)
239 #ifdef CONFIG_SND_DEBUG
241 snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
242 mpu->read(mpu, MPU401C(mpu)));
245 mpu->write(mpu, cmd, MPU401C(mpu));
246 if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
249 while (!ok && timeout-- > 0) {
250 if (snd_mpu401_input_avail(mpu)) {
251 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
255 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
259 spin_unlock_irqrestore(&mpu->input_lock, flags);
261 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
262 "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
263 mpu->read(mpu, MPU401C(mpu)),
264 mpu->read(mpu, MPU401D(mpu)));
270 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
272 if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
274 if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
280 * input/output open/close - protected by open_mutex in rawmidi.c
282 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
284 struct snd_mpu401 *mpu;
287 mpu = substream->rmidi->private_data;
288 if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
290 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
291 if (snd_mpu401_do_reset(mpu) < 0)
294 mpu->substream_input = substream;
295 set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
299 if (mpu->open_input && mpu->close_input)
300 mpu->close_input(mpu);
304 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
306 struct snd_mpu401 *mpu;
309 mpu = substream->rmidi->private_data;
310 if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
312 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
313 if (snd_mpu401_do_reset(mpu) < 0)
316 mpu->substream_output = substream;
317 set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
321 if (mpu->open_output && mpu->close_output)
322 mpu->close_output(mpu);
326 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
328 struct snd_mpu401 *mpu;
331 mpu = substream->rmidi->private_data;
332 clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
333 mpu->substream_input = NULL;
334 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
335 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
336 if (mpu->close_input)
337 mpu->close_input(mpu);
343 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
345 struct snd_mpu401 *mpu;
348 mpu = substream->rmidi->private_data;
349 clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
350 mpu->substream_output = NULL;
351 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
352 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
353 if (mpu->close_output)
354 mpu->close_output(mpu);
361 * trigger input callback
364 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
367 struct snd_mpu401 *mpu;
370 mpu = substream->rmidi->private_data;
372 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
374 /* first time - flush FIFO */
376 mpu->read(mpu, MPU401D(mpu));
378 snd_mpu401_uart_add_timer(mpu, 1);
381 /* read data in advance */
382 spin_lock_irqsave(&mpu->input_lock, flags);
383 snd_mpu401_uart_input_read(mpu);
384 spin_unlock_irqrestore(&mpu->input_lock, flags);
387 snd_mpu401_uart_remove_timer(mpu, 1);
388 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
394 * transfer input pending data
395 * call with input_lock spinlock held
397 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
403 if (! snd_mpu401_input_avail(mpu))
404 break; /* input not available */
405 byte = mpu->read(mpu, MPU401D(mpu));
406 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
407 snd_rawmidi_receive(mpu->substream_input, &byte, 1);
414 * AudioDrive ES1688 - 12 bytes
415 * S3 SonicVibes - 8 bytes
416 * SoundBlaster AWE 64 - 2 bytes (ugly hardware)
420 * write output pending bytes
421 * call with output_lock spinlock held
423 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
429 if (snd_rawmidi_transmit_peek(mpu->substream_output,
432 * Try twice because there is hardware that insists on
433 * setting the output busy bit after each write.
435 if (!snd_mpu401_output_ready(mpu) &&
436 !snd_mpu401_output_ready(mpu))
437 break; /* Tx FIFO full - try again later */
438 mpu->write(mpu, byte, MPU401D(mpu));
439 snd_rawmidi_transmit_ack(mpu->substream_output, 1);
441 snd_mpu401_uart_remove_timer (mpu, 0);
442 break; /* no other data - leave the tx loop */
448 * output trigger callback
451 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
454 struct snd_mpu401 *mpu;
456 mpu = substream->rmidi->private_data;
458 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
460 /* try to add the timer at each output trigger,
461 * since the output timer might have been removed in
462 * snd_mpu401_uart_output_write().
464 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
465 snd_mpu401_uart_add_timer(mpu, 0);
467 /* output pending data */
468 spin_lock_irqsave(&mpu->output_lock, flags);
469 snd_mpu401_uart_output_write(mpu);
470 spin_unlock_irqrestore(&mpu->output_lock, flags);
472 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
473 snd_mpu401_uart_remove_timer(mpu, 0);
474 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
482 static struct snd_rawmidi_ops snd_mpu401_uart_output =
484 .open = snd_mpu401_uart_output_open,
485 .close = snd_mpu401_uart_output_close,
486 .trigger = snd_mpu401_uart_output_trigger,
489 static struct snd_rawmidi_ops snd_mpu401_uart_input =
491 .open = snd_mpu401_uart_input_open,
492 .close = snd_mpu401_uart_input_close,
493 .trigger = snd_mpu401_uart_input_trigger,
496 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
498 struct snd_mpu401 *mpu = rmidi->private_data;
499 if (mpu->irq_flags && mpu->irq >= 0)
500 free_irq(mpu->irq, (void *) mpu);
501 release_and_free_resource(mpu->res);
506 * snd_mpu401_uart_new - create an MPU401-UART instance
507 * @card: the card instance
508 * @device: the device index, zero-based
509 * @hardware: the hardware type, MPU401_HW_XXXX
510 * @port: the base address of MPU401 port
511 * @info_flags: bitflags MPU401_INFO_XXX
512 * @irq: the irq number, -1 if no interrupt for mpu
513 * @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved.
514 * @rrawmidi: the pointer to store the new rawmidi instance
516 * Creates a new MPU-401 instance.
518 * Note that the rawmidi instance is returned on the rrawmidi argument,
519 * not the mpu401 instance itself. To access to the mpu401 instance,
520 * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
522 * Returns zero if successful, or a negative error code.
524 int snd_mpu401_uart_new(struct snd_card *card, int device,
525 unsigned short hardware,
527 unsigned int info_flags,
528 int irq, int irq_flags,
529 struct snd_rawmidi ** rrawmidi)
531 struct snd_mpu401 *mpu;
532 struct snd_rawmidi *rmidi;
533 int in_enable, out_enable;
538 if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
539 info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
540 in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
541 out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
542 if ((err = snd_rawmidi_new(card, "MPU-401U", device,
543 out_enable, in_enable, &rmidi)) < 0)
545 mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
547 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
548 snd_device_free(card, rmidi);
551 rmidi->private_data = mpu;
552 rmidi->private_free = snd_mpu401_uart_free;
553 spin_lock_init(&mpu->input_lock);
554 spin_lock_init(&mpu->output_lock);
555 spin_lock_init(&mpu->timer_lock);
556 mpu->hardware = hardware;
557 if (! (info_flags & MPU401_INFO_INTEGRATED)) {
558 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
559 mpu->res = request_region(port, res_size, "MPU401 UART");
560 if (mpu->res == NULL) {
561 snd_printk(KERN_ERR "mpu401_uart: "
562 "unable to grab port 0x%lx size %d\n",
564 snd_device_free(card, rmidi);
568 if (info_flags & MPU401_INFO_MMIO) {
569 mpu->write = mpu401_write_mmio;
570 mpu->read = mpu401_read_mmio;
572 mpu->write = mpu401_write_port;
573 mpu->read = mpu401_read_port;
576 if (hardware == MPU401_HW_PC98II)
577 mpu->cport = port + 2;
579 mpu->cport = port + 1;
580 if (irq >= 0 && irq_flags) {
581 if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags,
582 "MPU401 UART", (void *) mpu)) {
583 snd_printk(KERN_ERR "mpu401_uart: "
584 "unable to grab IRQ %d\n", irq);
585 snd_device_free(card, rmidi);
589 mpu->info_flags = info_flags;
591 mpu->irq_flags = irq_flags;
592 if (card->shortname[0])
593 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
596 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
598 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
599 &snd_mpu401_uart_output);
600 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
603 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
604 &snd_mpu401_uart_input);
605 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
607 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
615 EXPORT_SYMBOL(snd_mpu401_uart_new);
621 static int __init alsa_mpu401_uart_init(void)
626 static void __exit alsa_mpu401_uart_exit(void)
630 module_init(alsa_mpu401_uart_init)
631 module_exit(alsa_mpu401_uart_exit)