--- /dev/null
+/*
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ * Routines for the GF1 MIDI interface - like UART 6850
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#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 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 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;
+}
Code Review / kvmfornfv.git / blobdiff