// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) by Jaroslav Kysela <[email protected]>
* Routines for control of EMU10K1 MPU-401 in UART mode
*/
#include <linux/time.h>
#include <linux/init.h>
#include <sound/core.h>
#include <sound/emu10k1.h>
#define EMU10K1_MIDI_MODE_INPUT (1<<0)
#define EMU10K1_MIDI_MODE_OUTPUT (1<<1)
static inline unsigned char mpu401_read(struct snd_emu10k1 *emu,
struct snd_emu10k1_midi *mpu, int idx)
{
if (emu->audigy)
return (unsigned char)snd_emu10k1_ptr_read(emu, mpu->port + idx, 0);
else
return inb(emu->port + mpu->port + idx);
}
static inline void mpu401_write(struct snd_emu10k1 *emu,
struct snd_emu10k1_midi *mpu, int data, int idx)
{
if (emu->audigy)
snd_emu10k1_ptr_write(emu, mpu->port + idx, 0, data);
else
outb(data, emu->port + mpu->port + idx);
}
#define mpu401_write_data(emu, mpu, data) mpu401_write(emu, mpu, data, 0)
#define mpu401_write_cmd(emu, mpu, data) mpu401_write(emu, mpu, data, 1)
#define mpu401_read_data(emu, mpu) mpu401_read(emu, mpu, 0)
#define mpu401_read_stat(emu, mpu) mpu401_read(emu, mpu, 1)
#define mpu401_input_avail(emu,mpu) (!(mpu401_read_stat(emu,mpu) & 0x80))
#define mpu401_output_ready(emu,mpu) (!(mpu401_read_stat(emu,mpu) & 0x40))
#define MPU401_RESET 0xff
#define MPU401_ENTER_UART 0x3f
#define MPU401_ACK 0xfe
static void mpu401_clear_rx(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *mpu)
{
int timeout = 100000;
for (; timeout > 0 && mpu401_input_avail(emu, mpu); timeout--)
mpu401_read_data(emu, mpu);
#ifdef CONFIG_SND_DEBUG
if (timeout <= 0)
dev_err(emu->card->dev,
"cmd: clear rx timeout (status = 0x%x)\n",
mpu401_read_stat(emu, mpu));
#endif
}
/*
*/
static void do_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, unsigned int status)
{
unsigned char byte;
if (midi->rmidi == NULL) {
snd_emu10k1_intr_disable(emu, midi->tx_enable | midi->rx_enable);
return;
}
spin_lock(&midi->input_lock);
if ((status & midi->ipr_rx) && mpu401_input_avail(emu, midi)) {
if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
mpu401_clear_rx(emu, midi);
} else {
byte = mpu401_read_data(emu, midi);
if (midi->substream_input)
snd_rawmidi_receive(midi->substream_input, &byte, 1);
}
}
spin_unlock(&midi->input_lock);
spin_lock(&midi->output_lock);
if ((status & midi->ipr_tx) && mpu401_output_ready(emu, midi)) {
if (midi->substream_output &&
snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
mpu401_write_data(emu, midi, byte);
} else {
snd_emu10k1_intr_disable(emu, midi->tx_enable);
}
}
spin_unlock(&midi->output_lock);
}
static void snd_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, unsigned int status)
{
do_emu10k1_midi_interrupt(emu, &emu->midi, status);
}
static void snd_emu10k1_midi_interrupt2(struct snd_emu10k1 *emu, unsigned int status)
{
do_emu10k1_midi_interrupt(emu, &emu->midi2, status);
}
static int snd_emu10k1_midi_cmd(struct snd_emu10k1 * emu, struct snd_emu10k1_midi *midi, unsigned char cmd, int ack)
{
int timeout, ok;
spin_lock_irq(&midi->input_lock);
mpu401_write_data(emu, midi, 0x00);
/* mpu401_clear_rx(emu, midi); */
mpu401_write_cmd(emu, midi, cmd);
if (ack) {
ok = 0;
timeout = 10000;
while (!ok && timeout-- > 0) {
if (mpu401_input_avail(emu, midi)) {
if (mpu401_read_data(emu, midi) == MPU401_ACK)
ok = 1;
}
}
if (!ok && mpu401_read_data(emu, midi) == MPU401_ACK)
ok = 1;
} else {
ok = 1;
}
spin_unlock_irq(&midi->input_lock);
if (!ok) {
dev_err(emu->card->dev,
"midi_cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)!!!\n",
cmd, emu->port,
mpu401_read_stat(emu, midi),
mpu401_read_data(emu, midi));
return 1;
}
return 0;
}
static int snd_emu10k1_midi_input_open(struct snd_rawmidi_substream *substream)
{
struct snd_emu10k1 *emu;
struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
emu = midi->emu;
if (snd_BUG_ON(!emu))
return -ENXIO;
spin_lock_irq(&midi->open_lock);
midi->midi_mode |= EMU10K1_MIDI_MODE_INPUT;
midi->substream_input = substream;
if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) {
spin_unlock_irq(&midi->open_lock);
if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1))
goto error_out;
if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
goto error_out;
} else {
spin_unlock_irq(&midi->open_lock);
}
return 0;
error_out:
return -EIO;
}
static int snd_emu10k1_midi_output_open(struct snd_rawmidi_substream *substream)
{
struct snd_emu10k1 *emu;
struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
emu = midi->emu;
if (snd_BUG_ON(!emu))
return -ENXIO;
spin_lock_irq(&midi->open_lock);
midi->midi_mode |= EMU10K1_MIDI_MODE_OUTPUT;
midi->substream_output = substream;
if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
spin_unlock_irq(&midi->open_lock);
if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1))
goto error_out;
if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
goto error_out;
} else {
spin_unlock_irq(&midi->open_lock);
}
return 0;
error_out:
return -EIO;
}
static int snd_emu10k1_midi_input_close(struct snd_rawmidi_substream *substream)
{
struct snd_emu10k1 *emu;
struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
int err = 0;
emu = midi->emu;
if (snd_BUG_ON(!emu))
return -ENXIO;
spin_lock_irq(&midi->open_lock);
snd_emu10k1_intr_disable(emu, midi->rx_enable);
midi->midi_mode &= ~EMU10K1_MIDI_MODE_INPUT;
midi->substream_input = NULL;
if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) {
spin_unlock_irq(&midi->open_lock);
err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0);
} else {
spin_unlock_irq(&midi->open_lock);
}
return err;
}
static int snd_emu10k1_midi_output_close(struct snd_rawmidi_substream *substream)
{
struct snd_emu10k1 *emu;
struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
int err = 0;
emu = midi->emu;
if (snd_BUG_ON(!emu))
return -ENXIO;
spin_lock_irq(&midi->open_lock);
snd_emu10k1_intr_disable(emu, midi->tx_enable);
midi->midi_mode &= ~EMU10K1_MIDI_MODE_OUTPUT;
midi->substream_output = NULL;
if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
spin_unlock_irq(&midi->open_lock);
err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0);
} else {
spin_unlock_irq(&midi->open_lock);
}
return err;
}
static void snd_emu10k1_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
struct snd_emu10k1 *emu;
struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
emu = midi->emu;
if (snd_BUG_ON(!emu))
return;
if (up)
snd_emu10k1_intr_enable(emu, midi->rx_enable);
else
snd_emu10k1_intr_disable(emu, midi->rx_enable);
}
static void snd_emu10k1_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
struct snd_emu10k1 *emu;
struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
emu = midi->emu;
if (snd_BUG_ON(!emu))
return;
if (up) {
int max = 4;
unsigned char byte;
/* try to send some amount of bytes here before interrupts */
spin_lock_irq(&midi->output_lock);
while (max > 0) {
if (mpu401_output_ready(emu, midi)) {
if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT) ||
snd_rawmidi_transmit(substream, &byte, 1) != 1) {
/* no more data */
spin_unlock_irq(&midi->output_lock);
return;
}
mpu401_write_data(emu, midi, byte);
max--;
} else {
break;
}
}
spin_unlock_irq(&midi->output_lock);
snd_emu10k1_intr_enable(emu, midi->tx_enable);
} else {
snd_emu10k1_intr_disable(emu, midi->tx_enable);
}
}
/*
*/
static const struct snd_rawmidi_ops snd_emu10k1_midi_output =
{
.open = snd_emu10k1_midi_output_open,
.close = snd_emu10k1_midi_output_close,
.trigger = snd_emu10k1_midi_output_trigger,
};
static const struct snd_rawmidi_ops snd_emu10k1_midi_input =
{
.open = snd_emu10k1_midi_input_open,
.close = snd_emu10k1_midi_input_close,
.trigger = snd_emu10k1_midi_input_trigger,
};
static void snd_emu10k1_midi_free(struct snd_rawmidi *rmidi)
{
struct snd_emu10k1_midi *midi = rmidi->private_data;
midi->interrupt = NULL;
midi->rmidi = NULL;
}
static int emu10k1_midi_init(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, int device, char *name)
{
struct snd_rawmidi *rmidi;
int err;
err = snd_rawmidi_new(emu->card, name, device, 1, 1, &rmidi);
if (err < 0)
return err;
midi->emu = emu;
spin_lock_init(&midi->open_lock);
spin_lock_init(&midi->input_lock);
spin_lock_init(&midi->output_lock);
strcpy(rmidi->name, name);
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_emu10k1_midi_output);
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_emu10k1_midi_input);
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
SNDRV_RAWMIDI_INFO_INPUT |
SNDRV_RAWMIDI_INFO_DUPLEX;
rmidi->private_data = midi;
rmidi->private_free = snd_emu10k1_midi_free;
midi->rmidi = rmidi;
return 0;
}
int snd_emu10k1_midi(struct snd_emu10k1 *emu)
{
struct snd_emu10k1_midi *midi = &emu->midi;
int err;
err = emu10k1_midi_init(emu, midi, 0, "EMU10K1 MPU-401 (UART)");
if (err < 0)
return err;
midi->tx_enable = INTE_MIDITXENABLE;
midi->rx_enable = INTE_MIDIRXENABLE;
midi->port = MUDATA;
midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
midi->interrupt = snd_emu10k1_midi_interrupt;
return 0;
}
int snd_emu10k1_audigy_midi(struct snd_emu10k1 *emu)
{
struct snd_emu10k1_midi *midi;
int err;
midi = &emu->midi;
err = emu10k1_midi_init(emu, midi, 0, "Audigy MPU-401 (UART)");
if (err < 0)
return err;
midi->tx_enable = INTE_MIDITXENABLE;
midi->rx_enable = INTE_MIDIRXENABLE;
midi->port = A_MUDATA1;
midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
midi->interrupt = snd_emu10k1_midi_interrupt;
midi = &emu->midi2;
err = emu10k1_midi_init(emu, midi, 1, "Audigy MPU-401 #2");
if (err < 0)
return err;
midi->tx_enable = INTE_A_MIDITXENABLE2;
midi->rx_enable = INTE_A_MIDIRXENABLE2;
midi->port = A_MUDATA2;
midi->ipr_tx = IPR_A_MIDITRANSBUFEMPTY2;
midi->ipr_rx = IPR_A_MIDIRECVBUFEMPTY2;
midi->interrupt = snd_emu10k1_midi_interrupt2;
return 0;
}
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