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187 lines
3.3 KiB
C
187 lines
3.3 KiB
C
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/*
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* linux/kernel/chr_drv/sound/gus_card.c
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*
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* Detection routine for the Gravis Ultrasound.
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*
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* (C) 1993 Hannu Savolainen (hsavolai@cs.helsinki.fi) See COPYING for further
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* details. Should be distributed with this file.
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*/
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#include "sound_config.h"
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#if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_GUS)
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#include "gus_hw.h"
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void gusintr (int);
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int gus_base, gus_irq, gus_dma;
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static int
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set_gus_irq (int interrupt_level)
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{
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int retcode;
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#ifdef linux
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struct sigaction sa;
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sa.sa_handler = gusintr;
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#ifdef SND_SA_INTERRUPT
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sa.sa_flags = SA_INTERRUPT;
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#else
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sa.sa_flags = 0;
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#endif
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sa.sa_mask = 0;
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sa.sa_restorer = NULL;
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retcode = irqaction (interrupt_level, &sa);
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if (retcode < 0)
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{
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printk ("GUS: IRQ%d already in use\n", interrupt_level);
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}
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#else
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/* # error Unimplemented for this OS */
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#endif
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return retcode;
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}
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int
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gus_set_midi_irq (int interrupt_level)
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{
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int retcode;
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#ifdef linux
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struct sigaction sa;
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sa.sa_handler = gus_midi_interrupt;
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#ifdef SND_SA_INTERRUPT
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sa.sa_flags = SA_INTERRUPT;
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#else
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sa.sa_flags = 0;
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#endif
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sa.sa_mask = 0;
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sa.sa_restorer = NULL;
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retcode = irqaction (interrupt_level, &sa);
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if (retcode < 0)
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{
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printk ("GUS: IRQ%d already in use\n", interrupt_level);
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}
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#else
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/* # error Unimplemented for this OS */
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#endif
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return retcode;
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}
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long
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attach_gus_card (long mem_start, struct address_info *hw_config)
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{
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int io_addr;
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set_gus_irq (hw_config->irq);
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if (gus_wave_detect (hw_config->io_base)) /* Try first the default */
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{
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mem_start = gus_wave_init (mem_start, hw_config->irq, hw_config->dma);
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#ifndef EXCLUDE_MIDI
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mem_start = gus_midi_init (mem_start);
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#endif
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return mem_start;
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}
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#ifndef EXCLUDE_GUS_IODETECT
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/*
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* Look at the possible base addresses (0x2X0, X=1, 2, 3, 4, 5, 6)
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*/
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for (io_addr = 0x210; io_addr <= 0x260; io_addr += 0x10)
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if (io_addr != hw_config->io_base) /* Already tested */
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if (gus_wave_detect (io_addr))
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{
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printk (" WARNING! GUS found at %03x, config was %03x ", io_addr, hw_config->io_base);
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mem_start = gus_wave_init (mem_start, hw_config->irq, hw_config->dma);
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#ifndef EXCLUDE_MIDI
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mem_start = gus_midi_init (mem_start);
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#endif
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return mem_start;
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}
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#endif
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return mem_start; /* Not detected */
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}
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int
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probe_gus (struct address_info *hw_config)
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{
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int io_addr;
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if (gus_wave_detect (hw_config->io_base))
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return 1;
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#ifndef EXCLUDE_GUS_IODETECT
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/*
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* Look at the possible base addresses (0x2X0, X=1, 2, 3, 4, 5, 6)
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*/
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for (io_addr = 0x210; io_addr <= 0x260; io_addr += 0x10)
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if (io_addr != hw_config->io_base) /* Already tested */
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if (gus_wave_detect (io_addr))
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return 1;
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#endif
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return 0;
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}
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void
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gusintr (int unit)
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{
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unsigned char src;
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unsigned long flags;
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while (1)
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{
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if (!(src = INB (u_IrqStatus)))
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return;
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if (src & DMA_TC_IRQ)
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{
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guswave_dma_irq ();
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}
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if (src & (MIDI_TX_IRQ | MIDI_RX_IRQ))
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{
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#ifndef EXCLUDE_MIDI
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gus_midi_interrupt (0);
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#endif
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}
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if (src & (GF1_TIMER1_IRQ | GF1_TIMER2_IRQ))
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{
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printk ("T");
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gus_write8 (0x45, 0); /* Timer control */
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}
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if (src & (WAVETABLE_IRQ | ENVELOPE_IRQ))
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{
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DISABLE_INTR (flags);
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gus_voice_irq ();
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RESTORE_INTR (flags);
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}
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}
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}
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#endif
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