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, unsigned long addr)
66 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu, unsigned long addr)
71 static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data, unsigned long addr)
73 writeb(data, (void __iomem *)addr);
76 static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu, unsigned long addr)
78 return readb((void __iomem *)addr);
82 static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
85 for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
86 mpu->read(mpu, MPU401D(mpu));
87 #ifdef CONFIG_SND_DEBUG
89 snd_printk("cmd: clear rx timeout (status = 0x%x)\n", mpu->read(mpu, MPU401C(mpu)));
93 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
95 spin_lock(&mpu->input_lock);
96 if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
97 snd_mpu401_uart_input_read(mpu);
99 snd_mpu401_uart_clear_rx(mpu);
101 spin_unlock(&mpu->input_lock);
102 /* ok. for better Tx performance try do some output when input is done */
103 if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
104 test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
105 spin_lock(&mpu->output_lock);
106 snd_mpu401_uart_output_write(mpu);
107 spin_unlock(&mpu->output_lock);
112 * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
113 * @irq: the irq number
114 * @dev_id: mpu401 instance
115 * @regs: the reigster
117 * Processes the interrupt for MPU401-UART i/o.
119 irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id, struct pt_regs *regs)
121 struct snd_mpu401 *mpu = dev_id;
125 _snd_mpu401_uart_interrupt(mpu);
131 * reprogram the timer and call the interrupt job
133 static void snd_mpu401_uart_timer(unsigned long data)
135 struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
138 spin_lock_irqsave(&mpu->timer_lock, flags);
139 /*mpu->mode |= MPU401_MODE_TIMER;*/
140 mpu->timer.expires = 1 + jiffies;
141 add_timer(&mpu->timer);
142 spin_unlock_irqrestore(&mpu->timer_lock, flags);
144 _snd_mpu401_uart_interrupt(mpu);
148 * initialize the timer callback if not programmed yet
150 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
154 spin_lock_irqsave (&mpu->timer_lock, flags);
155 if (mpu->timer_invoked == 0) {
156 init_timer(&mpu->timer);
157 mpu->timer.data = (unsigned long)mpu;
158 mpu->timer.function = snd_mpu401_uart_timer;
159 mpu->timer.expires = 1 + jiffies;
160 add_timer(&mpu->timer);
162 mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER : MPU401_MODE_OUTPUT_TIMER;
163 spin_unlock_irqrestore (&mpu->timer_lock, flags);
167 * remove the timer callback if still active
169 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
173 spin_lock_irqsave (&mpu->timer_lock, flags);
174 if (mpu->timer_invoked) {
175 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER : ~MPU401_MODE_OUTPUT_TIMER;
176 if (! mpu->timer_invoked)
177 del_timer(&mpu->timer);
179 spin_unlock_irqrestore (&mpu->timer_lock, flags);
186 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
192 spin_lock_irqsave(&mpu->input_lock, flags);
193 if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
194 mpu->write(mpu, 0x00, MPU401D(mpu));
195 /*snd_mpu401_uart_clear_rx(mpu);*/
197 /* ok. standard MPU-401 initialization */
198 if (mpu->hardware != MPU401_HW_SB) {
199 for (timeout = 1000; timeout > 0 && !snd_mpu401_output_ready(mpu); timeout--)
201 #ifdef CONFIG_SND_DEBUG
203 snd_printk("cmd: tx timeout (status = 0x%x)\n", mpu->read(mpu, MPU401C(mpu)));
206 mpu->write(mpu, cmd, MPU401C(mpu));
210 while (!ok && timeout-- > 0) {
211 if (snd_mpu401_input_avail(mpu)) {
212 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
216 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
221 spin_unlock_irqrestore(&mpu->input_lock, flags);
223 snd_printk("cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)\n", cmd, mpu->port, mpu->read(mpu, MPU401C(mpu)), mpu->read(mpu, MPU401D(mpu)));
230 * input/output open/close - protected by open_mutex in rawmidi.c
232 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
234 struct snd_mpu401 *mpu;
237 mpu = substream->rmidi->private_data;
238 if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
240 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
241 if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
243 if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1))
246 mpu->substream_input = substream;
247 set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
251 if (mpu->open_input && mpu->close_input)
252 mpu->close_input(mpu);
256 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
258 struct snd_mpu401 *mpu;
261 mpu = substream->rmidi->private_data;
262 if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
264 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
265 if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
267 if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1))
270 mpu->substream_output = substream;
271 set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
275 if (mpu->open_output && mpu->close_output)
276 mpu->close_output(mpu);
280 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
282 struct snd_mpu401 *mpu;
285 mpu = substream->rmidi->private_data;
286 clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
287 mpu->substream_input = NULL;
288 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
289 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
290 if (mpu->close_input)
291 mpu->close_input(mpu);
297 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
299 struct snd_mpu401 *mpu;
302 mpu = substream->rmidi->private_data;
303 clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
304 mpu->substream_output = NULL;
305 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
306 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
307 if (mpu->close_output)
308 mpu->close_output(mpu);
315 * trigger input callback
317 static void snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
320 struct snd_mpu401 *mpu;
323 mpu = substream->rmidi->private_data;
325 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) {
326 /* first time - flush FIFO */
328 mpu->read(mpu, MPU401D(mpu));
330 snd_mpu401_uart_add_timer(mpu, 1);
333 /* read data in advance */
334 spin_lock_irqsave(&mpu->input_lock, flags);
335 snd_mpu401_uart_input_read(mpu);
336 spin_unlock_irqrestore(&mpu->input_lock, flags);
339 snd_mpu401_uart_remove_timer(mpu, 1);
340 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
346 * transfer input pending data
347 * call with input_lock spinlock held
349 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
355 if (snd_mpu401_input_avail(mpu)) {
356 byte = mpu->read(mpu, MPU401D(mpu));
357 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
358 snd_rawmidi_receive(mpu->substream_input, &byte, 1);
360 break; /* input not available */
368 * AudioDrive ES1688 - 12 bytes
369 * S3 SonicVibes - 8 bytes
370 * SoundBlaster AWE 64 - 2 bytes (ugly hardware)
374 * write output pending bytes
375 * call with output_lock spinlock held
377 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
380 int max = 256, timeout;
383 if (snd_rawmidi_transmit_peek(mpu->substream_output, &byte, 1) == 1) {
384 for (timeout = 100; timeout > 0; timeout--) {
385 if (snd_mpu401_output_ready(mpu)) {
386 mpu->write(mpu, byte, MPU401D(mpu));
387 snd_rawmidi_transmit_ack(mpu->substream_output, 1);
392 break; /* Tx FIFO full - try again later */
394 snd_mpu401_uart_remove_timer (mpu, 0);
395 break; /* no other data - leave the tx loop */
401 * output trigger callback
403 static void snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
406 struct snd_mpu401 *mpu;
408 mpu = substream->rmidi->private_data;
410 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
412 /* try to add the timer at each output trigger,
413 * since the output timer might have been removed in
414 * snd_mpu401_uart_output_write().
416 snd_mpu401_uart_add_timer(mpu, 0);
418 /* output pending data */
419 spin_lock_irqsave(&mpu->output_lock, flags);
420 snd_mpu401_uart_output_write(mpu);
421 spin_unlock_irqrestore(&mpu->output_lock, flags);
423 snd_mpu401_uart_remove_timer(mpu, 0);
424 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
432 static struct snd_rawmidi_ops snd_mpu401_uart_output =
434 .open = snd_mpu401_uart_output_open,
435 .close = snd_mpu401_uart_output_close,
436 .trigger = snd_mpu401_uart_output_trigger,
439 static struct snd_rawmidi_ops snd_mpu401_uart_input =
441 .open = snd_mpu401_uart_input_open,
442 .close = snd_mpu401_uart_input_close,
443 .trigger = snd_mpu401_uart_input_trigger,
446 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
448 struct snd_mpu401 *mpu = rmidi->private_data;
449 if (mpu->irq_flags && mpu->irq >= 0)
450 free_irq(mpu->irq, (void *) mpu);
451 release_and_free_resource(mpu->res);
456 * snd_mpu401_uart_new - create an MPU401-UART instance
457 * @card: the card instance
458 * @device: the device index, zero-based
459 * @hardware: the hardware type, MPU401_HW_XXXX
460 * @port: the base address of MPU401 port
461 * @integrated: non-zero if the port was already reserved by the chip
462 * @irq: the irq number, -1 if no interrupt for mpu
463 * @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved.
464 * @rrawmidi: the pointer to store the new rawmidi instance
466 * Creates a new MPU-401 instance.
468 * Note that the rawmidi instance is returned on the rrawmidi argument,
469 * not the mpu401 instance itself. To access to the mpu401 instance,
470 * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
472 * Returns zero if successful, or a negative error code.
474 int snd_mpu401_uart_new(struct snd_card *card, int device,
475 unsigned short hardware,
476 unsigned long port, int integrated,
477 int irq, int irq_flags,
478 struct snd_rawmidi ** rrawmidi)
480 struct snd_mpu401 *mpu;
481 struct snd_rawmidi *rmidi;
486 if ((err = snd_rawmidi_new(card, "MPU-401U", device, 1, 1, &rmidi)) < 0)
488 mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
490 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
491 snd_device_free(card, rmidi);
494 rmidi->private_data = mpu;
495 rmidi->private_free = snd_mpu401_uart_free;
496 spin_lock_init(&mpu->input_lock);
497 spin_lock_init(&mpu->output_lock);
498 spin_lock_init(&mpu->timer_lock);
499 mpu->hardware = hardware;
501 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
502 if ((mpu->res = request_region(port, res_size, "MPU401 UART")) == NULL) {
503 snd_printk(KERN_ERR "mpu401_uart: unable to grab port 0x%lx size %d\n", port, res_size);
504 snd_device_free(card, rmidi);
509 case MPU401_HW_AUREAL:
510 mpu->write = mpu401_write_mmio;
511 mpu->read = mpu401_read_mmio;
514 mpu->write = mpu401_write_port;
515 mpu->read = mpu401_read_port;
519 if (hardware == MPU401_HW_PC98II)
520 mpu->cport = port + 2;
522 mpu->cport = port + 1;
523 if (irq >= 0 && irq_flags) {
524 if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags, "MPU401 UART", (void *) mpu)) {
525 snd_printk(KERN_ERR "mpu401_uart: unable to grab IRQ %d\n", irq);
526 snd_device_free(card, rmidi);
531 mpu->irq_flags = irq_flags;
532 if (card->shortname[0])
533 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI", card->shortname);
535 sprintf(rmidi->name, "MPU-401 MIDI %d-%d", card->number, device);
536 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_mpu401_uart_output);
537 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_mpu401_uart_input);
538 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
539 SNDRV_RAWMIDI_INFO_INPUT |
540 SNDRV_RAWMIDI_INFO_DUPLEX;
547 EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
548 EXPORT_SYMBOL(snd_mpu401_uart_new);
554 static int __init alsa_mpu401_uart_init(void)
559 static void __exit alsa_mpu401_uart_exit(void)
563 module_init(alsa_mpu401_uart_init)
564 module_exit(alsa_mpu401_uart_exit)