sound/isa/gus/gus_uart.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   3  *  Routines for the GF1 MIDI interface - like UART 6850
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/delay.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/time.h>
  26 #include <sound/core.h>
  27 #include <sound/gus.h>
  28
  29 static void snd_gf1_interrupt_midi_in(struct snd_gus_card * gus)
  30 {
  31         int count;
  32         unsigned char stat, data, byte;
  33         unsigned long flags;
  34
  35         count = 10;
  36         while (count) {
  37                 spin_lock_irqsave(&gus->uart_cmd_lock, flags);
  38                 stat = snd_gf1_uart_stat(gus);
  39                 if (!(stat & 0x01)) {   /* data in Rx FIFO? */
  40                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  41                         count--;
  42                         continue;
  43                 }
  44                 count = 100;    /* arm counter to new value */
  45                 data = snd_gf1_uart_get(gus);
  46                 if (!(gus->gf1.uart_cmd & 0x80)) {
  47                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  48                         continue;
  49                 }
  50                 if (stat & 0x10) {      /* framing error */
  51                         gus->gf1.uart_framing++;
  52                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  53                         continue;
  54                 }
  55                 byte = snd_gf1_uart_get(gus);
  56                 spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  57                 snd_rawmidi_receive(gus->midi_substream_input, &byte, 1);
  58                 if (stat & 0x20) {
  59                         gus->gf1.uart_overrun++;
  60                 }
  61         }
  62 }
  63
  64 static void snd_gf1_interrupt_midi_out(struct snd_gus_card * gus)
  65 {
  66         char byte;
  67         unsigned long flags;
  68
  69         /* try unlock output */
  70         if (snd_gf1_uart_stat(gus) & 0x01)
  71                 snd_gf1_interrupt_midi_in(gus);
  72
  73         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
  74         if (snd_gf1_uart_stat(gus) & 0x02) {    /* Tx FIFO free? */
  75                 if (snd_rawmidi_transmit(gus->midi_substream_output, &byte, 1) != 1) {  /* no other bytes or error */
  76                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd & ~0x20); /* disable Tx interrupt */
  77                 } else {
  78                         snd_gf1_uart_put(gus, byte);
  79                 }
  80         }
  81         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  82 }
  83
  84 static void snd_gf1_uart_reset(struct snd_gus_card * gus, int close)
  85 {
  86         snd_gf1_uart_cmd(gus, 0x03);    /* reset */
  87         if (!close && gus->uart_enable) {
  88                 udelay(160);
  89                 snd_gf1_uart_cmd(gus, 0x00);    /* normal operations */
  90         }
  91 }
  92
  93 static int snd_gf1_uart_output_open(struct snd_rawmidi_substream *substream)
  94 {
  95         unsigned long flags;
  96         struct snd_gus_card *gus;
  97
  98         gus = substream->rmidi->private_data;
  99         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 100         if (!(gus->gf1.uart_cmd & 0x80)) {      /* input active? */
 101                 snd_gf1_uart_reset(gus, 0);
 102         }
 103         gus->gf1.interrupt_handler_midi_out = snd_gf1_interrupt_midi_out;
 104         gus->midi_substream_output = substream;
 105         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 106 #if 0
 107         snd_printk(KERN_DEBUG "write init - cmd = 0x%x, stat = 0x%x\n", gus->gf1.uart_cmd, snd_gf1_uart_stat(gus));
 108 #endif
 109         return 0;
 110 }
 111
 112 static int snd_gf1_uart_input_open(struct snd_rawmidi_substream *substream)
 113 {
 114         unsigned long flags;
 115         struct snd_gus_card *gus;
 116         int i;
 117
 118         gus = substream->rmidi->private_data;
 119         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 120         if (gus->gf1.interrupt_handler_midi_out != snd_gf1_interrupt_midi_out) {
 121                 snd_gf1_uart_reset(gus, 0);
 122         }
 123         gus->gf1.interrupt_handler_midi_in = snd_gf1_interrupt_midi_in;
 124         gus->midi_substream_input = substream;
 125         if (gus->uart_enable) {
 126                 for (i = 0; i < 1000 && (snd_gf1_uart_stat(gus) & 0x01); i++)
 127                         snd_gf1_uart_get(gus);  /* clean Rx */
 128                 if (i >= 1000)
 129                         snd_printk(KERN_ERR "gus midi uart init read - cleanup error\n");
 130         }
 131         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 132 #if 0
 133         snd_printk("read init - enable = %i, cmd = 0x%x, stat = 0x%x\n", gus->uart_enable, gus->gf1.uart_cmd, snd_gf1_uart_stat(gus));
 134         snd_printk("[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));
 135 #endif
 136         return 0;
 137 }
 138
 139 static int snd_gf1_uart_output_close(struct snd_rawmidi_substream *substream)
 140 {
 141         unsigned long flags;
 142         struct snd_gus_card *gus;
 143
 144         gus = substream->rmidi->private_data;
 145         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 146         if (gus->gf1.interrupt_handler_midi_in != snd_gf1_interrupt_midi_in)
 147                 snd_gf1_uart_reset(gus, 1);
 148         snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_MIDI_OUT);
 149         gus->midi_substream_output = NULL;
 150         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 151         return 0;
 152 }
 153
 154 static int snd_gf1_uart_input_close(struct snd_rawmidi_substream *substream)
 155 {
 156         unsigned long flags;
 157         struct snd_gus_card *gus;
 158
 159         gus = substream->rmidi->private_data;
 160         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 161         if (gus->gf1.interrupt_handler_midi_out != snd_gf1_interrupt_midi_out)
 162                 snd_gf1_uart_reset(gus, 1);
 163         snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_MIDI_IN);
 164         gus->midi_substream_input = NULL;
 165         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 166         return 0;
 167 }
 168
 169 static void snd_gf1_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
 170 {
 171         struct snd_gus_card *gus;
 172         unsigned long flags;
 173
 174         gus = substream->rmidi->private_data;
 175
 176         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 177         if (up) {
 178                 if ((gus->gf1.uart_cmd & 0x80) == 0)
 179                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd | 0x80); /* enable Rx interrupts */
 180         } else {
 181                 if (gus->gf1.uart_cmd & 0x80)
 182                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd & ~0x80); /* disable Rx interrupts */
 183         }
 184         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 185 }
 186
 187 static void snd_gf1_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
 188 {
 189         unsigned long flags;
 190         struct snd_gus_card *gus;
 191         char byte;
 192         int timeout;
 193
 194         gus = substream->rmidi->private_data;
 195
 196         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 197         if (up) {
 198                 if ((gus->gf1.uart_cmd & 0x20) == 0) {
 199                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 200                         /* wait for empty Rx - Tx is probably unlocked */
 201                         timeout = 10000;
 202                         while (timeout-- > 0 && snd_gf1_uart_stat(gus) & 0x01);
 203                         /* Tx FIFO free? */
 204                         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 205                         if (gus->gf1.uart_cmd & 0x20) {
 206                                 spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 207                                 return;
 208                         }
 209                         if (snd_gf1_uart_stat(gus) & 0x02) {
 210                                 if (snd_rawmidi_transmit(substream, &byte, 1) != 1) {
 211                                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 212                                         return;
 213                                 }
 214                                 snd_gf1_uart_put(gus, byte);
 215                         }
 216                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd | 0x20);        /* enable Tx interrupt */
 217                 }
 218         } else {
 219                 if (gus->gf1.uart_cmd & 0x20)
 220                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd & ~0x20);
 221         }
 222         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 223 }
 224
 225 static struct snd_rawmidi_ops snd_gf1_uart_output =
 226 {
 227         .open =         snd_gf1_uart_output_open,
 228         .close =        snd_gf1_uart_output_close,
 229         .trigger =      snd_gf1_uart_output_trigger,
 230 };
 231
 232 static struct snd_rawmidi_ops snd_gf1_uart_input =
 233 {
 234         .open =         snd_gf1_uart_input_open,
 235         .close =        snd_gf1_uart_input_close,
 236         .trigger =      snd_gf1_uart_input_trigger,
 237 };
 238
 239 int snd_gf1_rawmidi_new(struct snd_gus_card * gus, int device, struct snd_rawmidi ** rrawmidi)
 240 {
 241         struct snd_rawmidi *rmidi;
 242         int err;
 243
 244         if (rrawmidi)
 245                 *rrawmidi = NULL;
 246         if ((err = snd_rawmidi_new(gus->card, "GF1", device, 1, 1, &rmidi)) < 0)
 247                 return err;
 248         strcpy(rmidi->name, gus->interwave ? "AMD InterWave" : "GF1");
 249         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_gf1_uart_output);
 250         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_gf1_uart_input);
 251         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
 252         rmidi->private_data = gus;
 253         gus->midi_uart = rmidi;
 254         if (rrawmidi)
 255                 *rrawmidi = rmidi;
 256         return err;
 257 }