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// 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, byte;
__always_unused unsigned char data;
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;
err = snd_rawmidi_new(gus->card, "GF1", device, 1, 1, &rmidi);
if (err < 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;
}
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