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