kernel/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 <linux/delay.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/time.h>
  25 #include <sound/core.h>
  26 #include <sound/gus.h>
  27
  28 static void snd_gf1_interrupt_midi_in(struct snd_gus_card * gus)
  29 {
  30         int count;
  31         unsigned char stat, data, byte;
  32         unsigned long flags;
  33
  34         count = 10;
  35         while (count) {
  36                 spin_lock_irqsave(&gus->uart_cmd_lock, flags);
  37                 stat = snd_gf1_uart_stat(gus);
  38                 if (!(stat & 0x01)) {   /* data in Rx FIFO? */
  39                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  40                         count--;
  41                         continue;
  42                 }
  43                 count = 100;    /* arm counter to new value */
  44                 data = snd_gf1_uart_get(gus);
  45                 if (!(gus->gf1.uart_cmd & 0x80)) {
  46                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  47                         continue;
  48                 }
  49                 if (stat & 0x10) {      /* framing error */
  50                         gus->gf1.uart_framing++;
  51                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  52                         continue;
  53                 }
  54                 byte = snd_gf1_uart_get(gus);
  55                 spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  56                 snd_rawmidi_receive(gus->midi_substream_input, &byte, 1);
  57                 if (stat & 0x20) {
  58                         gus->gf1.uart_overrun++;
  59                 }
  60         }
  61 }
  62
  63 static void snd_gf1_interrupt_midi_out(struct snd_gus_card * gus)
  64 {
  65         char byte;
  66         unsigned long flags;
  67
  68         /* try unlock output */
  69         if (snd_gf1_uart_stat(gus) & 0x01)
  70                 snd_gf1_interrupt_midi_in(gus);
  71
  72         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
  73         if (snd_gf1_uart_stat(gus) & 0x02) {    /* Tx FIFO free? */
  74                 if (snd_rawmidi_transmit(gus->midi_substream_output, &byte, 1) != 1) {  /* no other bytes or error */
  75                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd & ~0x20); /* disable Tx interrupt */
  76                 } else {
  77                         snd_gf1_uart_put(gus, byte);
  78                 }
  79         }
  80         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
  81 }
  82
  83 static void snd_gf1_uart_reset(struct snd_gus_card * gus, int close)
  84 {
  85         snd_gf1_uart_cmd(gus, 0x03);    /* reset */
  86         if (!close && gus->uart_enable) {
  87                 udelay(160);
  88                 snd_gf1_uart_cmd(gus, 0x00);    /* normal operations */
  89         }
  90 }
  91
  92 static int snd_gf1_uart_output_open(struct snd_rawmidi_substream *substream)
  93 {
  94         unsigned long flags;
  95         struct snd_gus_card *gus;
  96
  97         gus = substream->rmidi->private_data;
  98         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
  99         if (!(gus->gf1.uart_cmd & 0x80)) {      /* input active? */
 100                 snd_gf1_uart_reset(gus, 0);
 101         }
 102         gus->gf1.interrupt_handler_midi_out = snd_gf1_interrupt_midi_out;
 103         gus->midi_substream_output = substream;
 104         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 105 #if 0
 106         snd_printk(KERN_DEBUG "write init - cmd = 0x%x, stat = 0x%x\n", gus->gf1.uart_cmd, snd_gf1_uart_stat(gus));
 107 #endif
 108         return 0;
 109 }
 110
 111 static int snd_gf1_uart_input_open(struct snd_rawmidi_substream *substream)
 112 {
 113         unsigned long flags;
 114         struct snd_gus_card *gus;
 115         int i;
 116
 117         gus = substream->rmidi->private_data;
 118         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 119         if (gus->gf1.interrupt_handler_midi_out != snd_gf1_interrupt_midi_out) {
 120                 snd_gf1_uart_reset(gus, 0);
 121         }
 122         gus->gf1.interrupt_handler_midi_in = snd_gf1_interrupt_midi_in;
 123         gus->midi_substream_input = substream;
 124         if (gus->uart_enable) {
 125                 for (i = 0; i < 1000 && (snd_gf1_uart_stat(gus) & 0x01); i++)
 126                         snd_gf1_uart_get(gus);  /* clean Rx */
 127                 if (i >= 1000)
 128                         snd_printk(KERN_ERR "gus midi uart init read - cleanup error\n");
 129         }
 130         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 131 #if 0
 132         snd_printk(KERN_DEBUG
 133                    "read init - enable = %i, cmd = 0x%x, stat = 0x%x\n",
 134                    gus->uart_enable, gus->gf1.uart_cmd, snd_gf1_uart_stat(gus));
 135         snd_printk(KERN_DEBUG
 136                    "[0x%x] reg (ctrl/status) = 0x%x, reg (data) = 0x%x "
 137                    "(page = 0x%x)\n",
 138                    gus->gf1.port + 0x100, inb(gus->gf1.port + 0x100),
 139                    inb(gus->gf1.port + 0x101), inb(gus->gf1.port + 0x102));
 140 #endif
 141         return 0;
 142 }
 143
 144 static int snd_gf1_uart_output_close(struct snd_rawmidi_substream *substream)
 145 {
 146         unsigned long flags;
 147         struct snd_gus_card *gus;
 148
 149         gus = substream->rmidi->private_data;
 150         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 151         if (gus->gf1.interrupt_handler_midi_in != snd_gf1_interrupt_midi_in)
 152                 snd_gf1_uart_reset(gus, 1);
 153         snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_MIDI_OUT);
 154         gus->midi_substream_output = NULL;
 155         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 156         return 0;
 157 }
 158
 159 static int snd_gf1_uart_input_close(struct snd_rawmidi_substream *substream)
 160 {
 161         unsigned long flags;
 162         struct snd_gus_card *gus;
 163
 164         gus = substream->rmidi->private_data;
 165         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 166         if (gus->gf1.interrupt_handler_midi_out != snd_gf1_interrupt_midi_out)
 167                 snd_gf1_uart_reset(gus, 1);
 168         snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_MIDI_IN);
 169         gus->midi_substream_input = NULL;
 170         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 171         return 0;
 172 }
 173
 174 static void snd_gf1_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
 175 {
 176         struct snd_gus_card *gus;
 177         unsigned long flags;
 178
 179         gus = substream->rmidi->private_data;
 180
 181         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 182         if (up) {
 183                 if ((gus->gf1.uart_cmd & 0x80) == 0)
 184                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd | 0x80); /* enable Rx interrupts */
 185         } else {
 186                 if (gus->gf1.uart_cmd & 0x80)
 187                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd & ~0x80); /* disable Rx interrupts */
 188         }
 189         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 190 }
 191
 192 static void snd_gf1_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
 193 {
 194         unsigned long flags;
 195         struct snd_gus_card *gus;
 196         char byte;
 197         int timeout;
 198
 199         gus = substream->rmidi->private_data;
 200
 201         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 202         if (up) {
 203                 if ((gus->gf1.uart_cmd & 0x20) == 0) {
 204                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 205                         /* wait for empty Rx - Tx is probably unlocked */
 206                         timeout = 10000;
 207                         while (timeout-- > 0 && snd_gf1_uart_stat(gus) & 0x01);
 208                         /* Tx FIFO free? */
 209                         spin_lock_irqsave(&gus->uart_cmd_lock, flags);
 210                         if (gus->gf1.uart_cmd & 0x20) {
 211                                 spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 212                                 return;
 213                         }
 214                         if (snd_gf1_uart_stat(gus) & 0x02) {
 215                                 if (snd_rawmidi_transmit(substream, &byte, 1) != 1) {
 216                                         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 217                                         return;
 218                                 }
 219                                 snd_gf1_uart_put(gus, byte);
 220                         }
 221                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd | 0x20);        /* enable Tx interrupt */
 222                 }
 223         } else {
 224                 if (gus->gf1.uart_cmd & 0x20)
 225                         snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd & ~0x20);
 226         }
 227         spin_unlock_irqrestore(&gus->uart_cmd_lock, flags);
 228 }
 229
 230 static struct snd_rawmidi_ops snd_gf1_uart_output =
 231 {
 232         .open =         snd_gf1_uart_output_open,
 233         .close =        snd_gf1_uart_output_close,
 234         .trigger =      snd_gf1_uart_output_trigger,
 235 };
 236
 237 static struct snd_rawmidi_ops snd_gf1_uart_input =
 238 {
 239         .open =         snd_gf1_uart_input_open,
 240         .close =        snd_gf1_uart_input_close,
 241         .trigger =      snd_gf1_uart_input_trigger,
 242 };
 243
 244 int snd_gf1_rawmidi_new(struct snd_gus_card *gus, int device)
 245 {
 246         struct snd_rawmidi *rmidi;
 247         int err;
 248
 249         if ((err = snd_rawmidi_new(gus->card, "GF1", device, 1, 1, &rmidi)) < 0)
 250                 return err;
 251         strcpy(rmidi->name, gus->interwave ? "AMD InterWave" : "GF1");
 252         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_gf1_uart_output);
 253         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_gf1_uart_input);
 254         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
 255         rmidi->private_data = gus;
 256         gus->midi_uart = rmidi;
 257         return err;
 258 }