release/src-rt-6.x.4708/linux/linux-2.6.36/sound/isa/gus/gus_irq.c

   1 /*
   2  *  Routine for IRQ handling from GF1/InterWave chip
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   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/core.h>
  23 #include <sound/info.h>
  24 #include <sound/gus.h>
  25
  26 #ifdef CONFIG_SND_DEBUG
  27 #define STAT_ADD(x)     ((x)++)
  28 #else
  29 #define STAT_ADD(x)     while (0) { ; }
  30 #endif
  31
  32 irqreturn_t snd_gus_interrupt(int irq, void *dev_id)
  33 {
  34         struct snd_gus_card * gus = dev_id;
  35         unsigned char status;
  36         int loop = 100;
  37         int handled = 0;
  38
  39 __again:
  40         status = inb(gus->gf1.reg_irqstat);
  41         if (status == 0)
  42                 return IRQ_RETVAL(handled);
  43         handled = 1;
  44         /* snd_printk(KERN_DEBUG "IRQ: status = 0x%x\n", status); */
  45         if (status & 0x02) {
  46                 STAT_ADD(gus->gf1.interrupt_stat_midi_in);
  47                 if (gus->gf1.interrupt_handler_midi_in)
  48                         gus->gf1.interrupt_handler_midi_in(gus);
  49         }
  50         if (status & 0x01) {
  51                 STAT_ADD(gus->gf1.interrupt_stat_midi_out);
  52                 if (gus->gf1.interrupt_handler_midi_out)
  53                         gus->gf1.interrupt_handler_midi_out(gus);
  54         }
  55         if (status & (0x20 | 0x40)) {
  56                 unsigned int already, _current_;
  57                 unsigned char voice_status, voice;
  58                 struct snd_gus_voice *pvoice;
  59
  60                 already = 0;
  61                 while (((voice_status = snd_gf1_i_read8(gus, SNDRV_GF1_GB_VOICES_IRQ)) & 0xc0) != 0xc0) {
  62                         voice = voice_status & 0x1f;
  63                         _current_ = 1 << voice;
  64                         if (already & _current_)
  65                                 continue;       /* multi request */
  66                         already |= _current_;   /* mark request */
  67                         pvoice = &gus->gf1.voices[voice];
  68                         if (pvoice->use) {
  69                                 if (!(voice_status & 0x80)) {   /* voice position IRQ */
  70                                         STAT_ADD(pvoice->interrupt_stat_wave);
  71                                         pvoice->handler_wave(gus, pvoice);
  72                                 }
  73                                 if (!(voice_status & 0x40)) {   /* volume ramp IRQ */
  74                                         STAT_ADD(pvoice->interrupt_stat_volume);
  75                                         pvoice->handler_volume(gus, pvoice);
  76                                 }
  77                         } else {
  78                                 STAT_ADD(gus->gf1.interrupt_stat_voice_lost);
  79                                 snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_ADDRESS_CONTROL);
  80                                 snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
  81                         }
  82                 }
  83         }
  84         if (status & 0x04) {
  85                 STAT_ADD(gus->gf1.interrupt_stat_timer1);
  86                 if (gus->gf1.interrupt_handler_timer1)
  87                         gus->gf1.interrupt_handler_timer1(gus);
  88         }
  89         if (status & 0x08) {
  90                 STAT_ADD(gus->gf1.interrupt_stat_timer2);
  91                 if (gus->gf1.interrupt_handler_timer2)
  92                         gus->gf1.interrupt_handler_timer2(gus);
  93         }
  94         if (status & 0x80) {
  95                 if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL) & 0x40) {
  96                         STAT_ADD(gus->gf1.interrupt_stat_dma_write);
  97                         if (gus->gf1.interrupt_handler_dma_write)
  98                                 gus->gf1.interrupt_handler_dma_write(gus);
  99                 }
 100                 if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL) & 0x40) {
 101                         STAT_ADD(gus->gf1.interrupt_stat_dma_read);
 102                         if (gus->gf1.interrupt_handler_dma_read)
 103                                 gus->gf1.interrupt_handler_dma_read(gus);
 104                 }
 105         }
 106         if (--loop > 0)
 107                 goto __again;
 108         return IRQ_NONE;
 109 }
 110
 111 #ifdef CONFIG_SND_DEBUG
 112 static void snd_gus_irq_info_read(struct snd_info_entry *entry,
 113                                   struct snd_info_buffer *buffer)
 114 {
 115         struct snd_gus_card *gus;
 116         struct snd_gus_voice *pvoice;
 117         int idx;
 118
 119         gus = entry->private_data;
 120         snd_iprintf(buffer, "midi out = %u\n", gus->gf1.interrupt_stat_midi_out);
 121         snd_iprintf(buffer, "midi in = %u\n", gus->gf1.interrupt_stat_midi_in);
 122         snd_iprintf(buffer, "timer1 = %u\n", gus->gf1.interrupt_stat_timer1);
 123         snd_iprintf(buffer, "timer2 = %u\n", gus->gf1.interrupt_stat_timer2);
 124         snd_iprintf(buffer, "dma write = %u\n", gus->gf1.interrupt_stat_dma_write);
 125         snd_iprintf(buffer, "dma read = %u\n", gus->gf1.interrupt_stat_dma_read);
 126         snd_iprintf(buffer, "voice lost = %u\n", gus->gf1.interrupt_stat_voice_lost);
 127         for (idx = 0; idx < 32; idx++) {
 128                 pvoice = &gus->gf1.voices[idx];
 129                 snd_iprintf(buffer, "voice %i: wave = %u, volume = %u\n",
 130                                         idx,
 131                                         pvoice->interrupt_stat_wave,
 132                                         pvoice->interrupt_stat_volume);
 133         }
 134 }
 135
 136 void snd_gus_irq_profile_init(struct snd_gus_card *gus)
 137 {
 138         struct snd_info_entry *entry;
 139
 140         if (! snd_card_proc_new(gus->card, "gusirq", &entry))
 141                 snd_info_set_text_ops(entry, gus, snd_gus_irq_info_read);
 142 }
 143
 144 #endif