244 lines
7.1 KiB
C
244 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
|
|
* Routines for the GF1 MIDI interface - like UART 6850
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/time.h>
|
|
#include <sound/core.h>
|
|
#include <sound/gus.h>
|
|
|
|
static void snd_gf1_interrupt_midi_in(struct snd_gus_card * gus)
|
|
{
|
|
int count;
|
|
unsigned char stat, data, byte;
|
|
unsigned long flags;
|
|
|
|
count = 10;
|
|
while (count) {
|
|
spin_lock_irqsave(&gus->uart_cmd_lock, flags);
|
|
stat = snd_gf1_uart_stat(gus);
|
|
if (!(stat & 0x01)) { /* data in Rx FIFO? */
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
count--;
|
|
continue;
|
|
}
|
|
count = 100; /* arm counter to new value */
|
|
data = snd_gf1_uart_get(gus);
|
|
if (!(gus->gf1.uart_cmd & 0x80)) {
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
continue;
|
|
}
|
|
if (stat & 0x10) { /* framing error */
|
|
gus->gf1.uart_framing++;
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
continue;
|
|
}
|
|
byte = snd_gf1_uart_get(gus);
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
snd_rawmidi_receive(gus->midi_substream_input, &byte, 1);
|
|
if (stat & 0x20) {
|
|
gus->gf1.uart_overrun++;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void snd_gf1_interrupt_midi_out(struct snd_gus_card * gus)
|
|
{
|
|
char byte;
|
|
unsigned long flags;
|
|
|
|
/* try unlock output */
|
|
if (snd_gf1_uart_stat(gus) & 0x01)
|
|
snd_gf1_interrupt_midi_in(gus);
|
|
|
|
spin_lock_irqsave(&gus->uart_cmd_lock, flags);
|
|
if (snd_gf1_uart_stat(gus) & 0x02) { /* Tx FIFO free? */
|
|
if (snd_rawmidi_transmit(gus->midi_substream_output, &byte, 1) != 1) { /* no other bytes or error */
|
|
snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd & ~0x20); /* disable Tx interrupt */
|
|
} else {
|
|
snd_gf1_uart_put(gus, byte);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
}
|
|
|
|
static void snd_gf1_uart_reset(struct snd_gus_card * gus, int close)
|
|
{
|
|
snd_gf1_uart_cmd(gus, 0x03); /* reset */
|
|
if (!close && gus->uart_enable) {
|
|
udelay(160);
|
|
snd_gf1_uart_cmd(gus, 0x00); /* normal operations */
|
|
}
|
|
}
|
|
|
|
static int snd_gf1_uart_output_open(struct snd_rawmidi_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_gus_card *gus;
|
|
|
|
gus = substream->rmidi->private_data;
|
|
spin_lock_irqsave(&gus->uart_cmd_lock, flags);
|
|
if (!(gus->gf1.uart_cmd & 0x80)) { /* input active? */
|
|
snd_gf1_uart_reset(gus, 0);
|
|
}
|
|
gus->gf1.interrupt_handler_midi_out = snd_gf1_interrupt_midi_out;
|
|
gus->midi_substream_output = substream;
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
#if 0
|
|
snd_printk(KERN_DEBUG "write init - cmd = 0x%x, stat = 0x%x\n", gus->gf1.uart_cmd, snd_gf1_uart_stat(gus));
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int snd_gf1_uart_input_open(struct snd_rawmidi_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_gus_card *gus;
|
|
int i;
|
|
|
|
gus = substream->rmidi->private_data;
|
|
spin_lock_irqsave(&gus->uart_cmd_lock, flags);
|
|
if (gus->gf1.interrupt_handler_midi_out != snd_gf1_interrupt_midi_out) {
|
|
snd_gf1_uart_reset(gus, 0);
|
|
}
|
|
gus->gf1.interrupt_handler_midi_in = snd_gf1_interrupt_midi_in;
|
|
gus->midi_substream_input = substream;
|
|
if (gus->uart_enable) {
|
|
for (i = 0; i < 1000 && (snd_gf1_uart_stat(gus) & 0x01); i++)
|
|
snd_gf1_uart_get(gus); /* clean Rx */
|
|
if (i >= 1000)
|
|
snd_printk(KERN_ERR "gus midi uart init read - cleanup error\n");
|
|
}
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
#if 0
|
|
snd_printk(KERN_DEBUG
|
|
"read init - enable = %i, cmd = 0x%x, stat = 0x%x\n",
|
|
gus->uart_enable, gus->gf1.uart_cmd, snd_gf1_uart_stat(gus));
|
|
snd_printk(KERN_DEBUG
|
|
"[0x%x] reg (ctrl/status) = 0x%x, reg (data) = 0x%x "
|
|
"(page = 0x%x)\n",
|
|
gus->gf1.port + 0x100, inb(gus->gf1.port + 0x100),
|
|
inb(gus->gf1.port + 0x101), inb(gus->gf1.port + 0x102));
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int snd_gf1_uart_output_close(struct snd_rawmidi_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_gus_card *gus;
|
|
|
|
gus = substream->rmidi->private_data;
|
|
spin_lock_irqsave(&gus->uart_cmd_lock, flags);
|
|
if (gus->gf1.interrupt_handler_midi_in != snd_gf1_interrupt_midi_in)
|
|
snd_gf1_uart_reset(gus, 1);
|
|
snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_MIDI_OUT);
|
|
gus->midi_substream_output = NULL;
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_gf1_uart_input_close(struct snd_rawmidi_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_gus_card *gus;
|
|
|
|
gus = substream->rmidi->private_data;
|
|
spin_lock_irqsave(&gus->uart_cmd_lock, flags);
|
|
if (gus->gf1.interrupt_handler_midi_out != snd_gf1_interrupt_midi_out)
|
|
snd_gf1_uart_reset(gus, 1);
|
|
snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_MIDI_IN);
|
|
gus->midi_substream_input = NULL;
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static void snd_gf1_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
|
|
{
|
|
struct snd_gus_card *gus;
|
|
unsigned long flags;
|
|
|
|
gus = substream->rmidi->private_data;
|
|
|
|
spin_lock_irqsave(&gus->uart_cmd_lock, flags);
|
|
if (up) {
|
|
if ((gus->gf1.uart_cmd & 0x80) == 0)
|
|
snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd | 0x80); /* enable Rx interrupts */
|
|
} else {
|
|
if (gus->gf1.uart_cmd & 0x80)
|
|
snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd & ~0x80); /* disable Rx interrupts */
|
|
}
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
}
|
|
|
|
static void snd_gf1_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_gus_card *gus;
|
|
char byte;
|
|
int timeout;
|
|
|
|
gus = substream->rmidi->private_data;
|
|
|
|
spin_lock_irqsave(&gus->uart_cmd_lock, flags);
|
|
if (up) {
|
|
if ((gus->gf1.uart_cmd & 0x20) == 0) {
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
/* wait for empty Rx - Tx is probably unlocked */
|
|
timeout = 10000;
|
|
while (timeout-- > 0 && snd_gf1_uart_stat(gus) & 0x01);
|
|
/* Tx FIFO free? */
|
|
spin_lock_irqsave(&gus->uart_cmd_lock, flags);
|
|
if (gus->gf1.uart_cmd & 0x20) {
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
return;
|
|
}
|
|
if (snd_gf1_uart_stat(gus) & 0x02) {
|
|
if (snd_rawmidi_transmit(substream, &byte, 1) != 1) {
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
return;
|
|
}
|
|
snd_gf1_uart_put(gus, byte);
|
|
}
|
|
snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd | 0x20); /* enable Tx interrupt */
|
|
}
|
|
} else {
|
|
if (gus->gf1.uart_cmd & 0x20)
|
|
snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd & ~0x20);
|
|
}
|
|
spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
|
|
}
|
|
|
|
static const struct snd_rawmidi_ops snd_gf1_uart_output =
|
|
{
|
|
.open = snd_gf1_uart_output_open,
|
|
.close = snd_gf1_uart_output_close,
|
|
.trigger = snd_gf1_uart_output_trigger,
|
|
};
|
|
|
|
static const struct snd_rawmidi_ops snd_gf1_uart_input =
|
|
{
|
|
.open = snd_gf1_uart_input_open,
|
|
.close = snd_gf1_uart_input_close,
|
|
.trigger = snd_gf1_uart_input_trigger,
|
|
};
|
|
|
|
int snd_gf1_rawmidi_new(struct snd_gus_card *gus, int device)
|
|
{
|
|
struct snd_rawmidi *rmidi;
|
|
int err;
|
|
|
|
if ((err = snd_rawmidi_new(gus->card, "GF1", device, 1, 1, &rmidi)) < 0)
|
|
return err;
|
|
strcpy(rmidi->name, gus->interwave ? "AMD InterWave" : "GF1");
|
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_gf1_uart_output);
|
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_gf1_uart_input);
|
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
|
|
rmidi->private_data = gus;
|
|
gus->midi_uart = rmidi;
|
|
return err;
|
|
}
|