2 * Copyright (c) by Jaroslav Kysela <perex@suse.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.
31 #include <sound/driver.h>
33 #include <linux/delay.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/ioport.h>
37 #include <linux/interrupt.h>
38 #include <linux/errno.h>
39 #include <sound/core.h>
40 #include <sound/mpu401.h>
42 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
43 MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
44 MODULE_LICENSE("GPL");
46 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
47 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
53 #define snd_mpu401_input_avail(mpu) (!(mpu->read(mpu, MPU401C(mpu)) & 0x80))
54 #define snd_mpu401_output_ready(mpu) (!(mpu->read(mpu, MPU401C(mpu)) & 0x40))
56 #define MPU401_RESET 0xff
57 #define MPU401_ENTER_UART 0x3f
58 #define MPU401_ACK 0xfe
60 /* Build in lowlevel io */
61 static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
67 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
73 static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
76 writeb(data, (void __iomem *)addr);
79 static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
82 return readb((void __iomem *)addr);
86 static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
89 for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
90 mpu->read(mpu, MPU401D(mpu));
91 #ifdef CONFIG_SND_DEBUG
93 snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
94 mpu->read(mpu, MPU401C(mpu)));
98 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
100 spin_lock(&mpu->input_lock);
101 if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
102 snd_mpu401_uart_input_read(mpu);
104 snd_mpu401_uart_clear_rx(mpu);
105 spin_unlock(&mpu->input_lock);
106 /* ok. for better Tx performance try do some output when
109 if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
110 test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
111 spin_lock(&mpu->output_lock);
112 snd_mpu401_uart_output_write(mpu);
113 spin_unlock(&mpu->output_lock);
118 * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
119 * @irq: the irq number
120 * @dev_id: mpu401 instance
121 * @regs: the reigster
123 * Processes the interrupt for MPU401-UART i/o.
125 irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id,
126 struct pt_regs *regs)
128 struct snd_mpu401 *mpu = dev_id;
132 _snd_mpu401_uart_interrupt(mpu);
136 EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
140 * reprogram the timer and call the interrupt job
142 static void snd_mpu401_uart_timer(unsigned long data)
144 struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
147 spin_lock_irqsave(&mpu->timer_lock, flags);
148 /*mpu->mode |= MPU401_MODE_TIMER;*/
149 mpu->timer.expires = 1 + jiffies;
150 add_timer(&mpu->timer);
151 spin_unlock_irqrestore(&mpu->timer_lock, flags);
153 _snd_mpu401_uart_interrupt(mpu);
157 * initialize the timer callback if not programmed yet
159 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
163 spin_lock_irqsave (&mpu->timer_lock, flags);
164 if (mpu->timer_invoked == 0) {
165 init_timer(&mpu->timer);
166 mpu->timer.data = (unsigned long)mpu;
167 mpu->timer.function = snd_mpu401_uart_timer;
168 mpu->timer.expires = 1 + jiffies;
169 add_timer(&mpu->timer);
171 mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
172 MPU401_MODE_OUTPUT_TIMER;
173 spin_unlock_irqrestore (&mpu->timer_lock, flags);
177 * remove the timer callback if still active
179 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
183 spin_lock_irqsave (&mpu->timer_lock, flags);
184 if (mpu->timer_invoked) {
185 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
186 ~MPU401_MODE_OUTPUT_TIMER;
187 if (! mpu->timer_invoked)
188 del_timer(&mpu->timer);
190 spin_unlock_irqrestore (&mpu->timer_lock, flags);
194 * send a UART command
195 * return zero if successful, non-zero for some errors
198 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
204 spin_lock_irqsave(&mpu->input_lock, flags);
205 if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
206 mpu->write(mpu, 0x00, MPU401D(mpu));
207 /*snd_mpu401_uart_clear_rx(mpu);*/
209 /* ok. standard MPU-401 initialization */
210 if (mpu->hardware != MPU401_HW_SB) {
211 for (timeout = 1000; timeout > 0 &&
212 !snd_mpu401_output_ready(mpu); timeout--)
214 #ifdef CONFIG_SND_DEBUG
216 snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
217 mpu->read(mpu, MPU401C(mpu)));
220 mpu->write(mpu, cmd, MPU401C(mpu));
224 while (!ok && timeout-- > 0) {
225 if (snd_mpu401_input_avail(mpu)) {
226 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
230 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
234 spin_unlock_irqrestore(&mpu->input_lock, flags);
236 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
237 "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
238 mpu->read(mpu, MPU401C(mpu)),
239 mpu->read(mpu, MPU401D(mpu)));
246 * input/output open/close - protected by open_mutex in rawmidi.c
248 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
250 struct snd_mpu401 *mpu;
253 mpu = substream->rmidi->private_data;
254 if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
256 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
257 if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
259 if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1))
262 mpu->substream_input = substream;
263 set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
267 if (mpu->open_input && mpu->close_input)
268 mpu->close_input(mpu);
272 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
274 struct snd_mpu401 *mpu;
277 mpu = substream->rmidi->private_data;
278 if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
280 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
281 if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
283 if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1))
286 mpu->substream_output = substream;
287 set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
291 if (mpu->open_output && mpu->close_output)
292 mpu->close_output(mpu);
296 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
298 struct snd_mpu401 *mpu;
301 mpu = substream->rmidi->private_data;
302 clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
303 mpu->substream_input = NULL;
304 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
305 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
306 if (mpu->close_input)
307 mpu->close_input(mpu);
313 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
315 struct snd_mpu401 *mpu;
318 mpu = substream->rmidi->private_data;
319 clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
320 mpu->substream_output = NULL;
321 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
322 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
323 if (mpu->close_output)
324 mpu->close_output(mpu);
331 * trigger input callback
334 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
337 struct snd_mpu401 *mpu;
340 mpu = substream->rmidi->private_data;
342 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
344 /* first time - flush FIFO */
346 mpu->read(mpu, MPU401D(mpu));
348 snd_mpu401_uart_add_timer(mpu, 1);
351 /* read data in advance */
352 spin_lock_irqsave(&mpu->input_lock, flags);
353 snd_mpu401_uart_input_read(mpu);
354 spin_unlock_irqrestore(&mpu->input_lock, flags);
357 snd_mpu401_uart_remove_timer(mpu, 1);
358 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
364 * transfer input pending data
365 * call with input_lock spinlock held
367 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
373 if (! snd_mpu401_input_avail(mpu))
374 break; /* input not available */
375 byte = mpu->read(mpu, MPU401D(mpu));
376 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
377 snd_rawmidi_receive(mpu->substream_input, &byte, 1);
384 * AudioDrive ES1688 - 12 bytes
385 * S3 SonicVibes - 8 bytes
386 * SoundBlaster AWE 64 - 2 bytes (ugly hardware)
390 * write output pending bytes
391 * call with output_lock spinlock held
393 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
396 int max = 256, timeout;
399 if (snd_rawmidi_transmit_peek(mpu->substream_output,
401 for (timeout = 100; timeout > 0; timeout--) {
402 if (snd_mpu401_output_ready(mpu))
406 break; /* Tx FIFO full - try again later */
407 mpu->write(mpu, byte, MPU401D(mpu));
408 snd_rawmidi_transmit_ack(mpu->substream_output, 1);
410 snd_mpu401_uart_remove_timer (mpu, 0);
411 break; /* no other data - leave the tx loop */
417 * output trigger callback
420 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
423 struct snd_mpu401 *mpu;
425 mpu = substream->rmidi->private_data;
427 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
429 /* try to add the timer at each output trigger,
430 * since the output timer might have been removed in
431 * snd_mpu401_uart_output_write().
433 snd_mpu401_uart_add_timer(mpu, 0);
435 /* output pending data */
436 spin_lock_irqsave(&mpu->output_lock, flags);
437 snd_mpu401_uart_output_write(mpu);
438 spin_unlock_irqrestore(&mpu->output_lock, flags);
440 snd_mpu401_uart_remove_timer(mpu, 0);
441 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
449 static struct snd_rawmidi_ops snd_mpu401_uart_output =
451 .open = snd_mpu401_uart_output_open,
452 .close = snd_mpu401_uart_output_close,
453 .trigger = snd_mpu401_uart_output_trigger,
456 static struct snd_rawmidi_ops snd_mpu401_uart_input =
458 .open = snd_mpu401_uart_input_open,
459 .close = snd_mpu401_uart_input_close,
460 .trigger = snd_mpu401_uart_input_trigger,
463 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
465 struct snd_mpu401 *mpu = rmidi->private_data;
466 if (mpu->irq_flags && mpu->irq >= 0)
467 free_irq(mpu->irq, (void *) mpu);
468 release_and_free_resource(mpu->res);
473 * snd_mpu401_uart_new - create an MPU401-UART instance
474 * @card: the card instance
475 * @device: the device index, zero-based
476 * @hardware: the hardware type, MPU401_HW_XXXX
477 * @port: the base address of MPU401 port
478 * @integrated: non-zero if the port was already reserved by the chip
479 * @irq: the irq number, -1 if no interrupt for mpu
480 * @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved.
481 * @rrawmidi: the pointer to store the new rawmidi instance
483 * Creates a new MPU-401 instance.
485 * Note that the rawmidi instance is returned on the rrawmidi argument,
486 * not the mpu401 instance itself. To access to the mpu401 instance,
487 * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
489 * Returns zero if successful, or a negative error code.
491 int snd_mpu401_uart_new(struct snd_card *card, int device,
492 unsigned short hardware,
493 unsigned long port, int integrated,
494 int irq, int irq_flags,
495 struct snd_rawmidi ** rrawmidi)
497 struct snd_mpu401 *mpu;
498 struct snd_rawmidi *rmidi;
503 if ((err = snd_rawmidi_new(card, "MPU-401U", device, 1, 1, &rmidi)) < 0)
505 mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
507 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
508 snd_device_free(card, rmidi);
511 rmidi->private_data = mpu;
512 rmidi->private_free = snd_mpu401_uart_free;
513 spin_lock_init(&mpu->input_lock);
514 spin_lock_init(&mpu->output_lock);
515 spin_lock_init(&mpu->timer_lock);
516 mpu->hardware = hardware;
518 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
519 mpu->res = request_region(port, res_size, "MPU401 UART");
520 if (mpu->res == NULL) {
521 snd_printk(KERN_ERR "mpu401_uart: "
522 "unable to grab port 0x%lx size %d\n",
524 snd_device_free(card, rmidi);
529 case MPU401_HW_AUREAL:
530 mpu->write = mpu401_write_mmio;
531 mpu->read = mpu401_read_mmio;
534 mpu->write = mpu401_write_port;
535 mpu->read = mpu401_read_port;
539 if (hardware == MPU401_HW_PC98II)
540 mpu->cport = port + 2;
542 mpu->cport = port + 1;
543 if (irq >= 0 && irq_flags) {
544 if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags,
545 "MPU401 UART", (void *) mpu)) {
546 snd_printk(KERN_ERR "mpu401_uart: "
547 "unable to grab IRQ %d\n", irq);
548 snd_device_free(card, rmidi);
553 mpu->irq_flags = irq_flags;
554 if (card->shortname[0])
555 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
558 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
559 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
560 &snd_mpu401_uart_output);
561 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
562 &snd_mpu401_uart_input);
563 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
564 SNDRV_RAWMIDI_INFO_INPUT |
565 SNDRV_RAWMIDI_INFO_DUPLEX;
572 EXPORT_SYMBOL(snd_mpu401_uart_new);
578 static int __init alsa_mpu401_uart_init(void)
583 static void __exit alsa_mpu401_uart_exit(void)
587 module_init(alsa_mpu401_uart_init)
588 module_exit(alsa_mpu401_uart_exit)