745 lines
15 KiB
C
745 lines
15 KiB
C
/*
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* sound/sb_dsp.c
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*
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* The low level driver for the SoundBlaster DSP chip.
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*
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* Copyright by Hannu Savolainen 1993
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include "sound_config.h"
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#if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_SB)
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#include "sb.h"
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#include "sb_mixer.h"
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#undef SB_TEST_IRQ
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int sbc_base = 0;
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static int sbc_irq = 0;
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/*
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* The DSP channel can be used either for input or output. Variable
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* 'sb_irq_mode' will be set when the program calls read or write first time
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* after open. Current version doesn't support mode changes without closing
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* and reopening the device. Support for this feature may be implemented in a
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* future version of this driver.
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*/
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int sb_dsp_ok = 0; /* Set to 1 after successful initialization */
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static int midi_disabled = 0;
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int sb_dsp_highspeed = 0;
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static int major = 1, minor = 0; /* DSP version */
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static int dsp_stereo = 0;
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static int dsp_current_speed = DSP_DEFAULT_SPEED;
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static int sb16 = 0;
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static int irq_verified = 0;
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int sb_midi_mode = NORMAL_MIDI;
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int sb_midi_busy = 0; /* 1 if the process has output to MIDI */
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int sb_dsp_busy = 0;
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volatile int sb_irq_mode = IMODE_NONE; /* IMODE_INPUT, IMODE_OUTPUT
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* or IMODE_NONE */
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static volatile int irq_ok = 0;
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int sb_dsp_model = 1; /* 1=SB, 2=SB Pro */
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int sb_duplex_midi = 0;
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static int my_dev = 0;
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volatile int sb_intr_active = 0;
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static int dsp_speed (int);
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static int dsp_set_stereo (int mode);
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int sb_dsp_command (unsigned char val);
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#if !defined(EXCLUDE_MIDI) || !defined(EXCLUDE_AUDIO)
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/* Common code for the midi and pcm functions */
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int
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sb_dsp_command (unsigned char val)
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{
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int i;
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unsigned long limit;
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limit = GET_TIME () + HZ/10; /* The timeout is 0.1 secods */
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/*
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* Note! the i<500000 is an emergency exit. The sb_dsp_command() is sometimes
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* called while interrupts are disabled. This means that the timer is
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* disabled also. However the timeout situation is a abnormal condition.
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* Normally the DSP should be ready to accept commands after just couple of
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* loops.
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*/
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for (i = 0; i < 500000 && GET_TIME () < limit; i++)
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{
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if ((INB (DSP_STATUS) & 0x80) == 0)
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{
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OUTB (val, DSP_COMMAND);
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return 1;
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}
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}
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printk ("SoundBlaster: DSP Command(%x) Timeout.\n", val);
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printk ("IRQ conflict???\n");
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return 0;
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}
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void
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sbintr (int unit)
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{
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int status, data;
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#ifndef EXCLUDE_SBPRO
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if (sb16)
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{
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unsigned char src = sb_getmixer (IRQ_STAT); /* Interrupt source register */
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#ifndef EXCLUDE_SB16
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if (src & 3)
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sb16_dsp_interrupt (unit);
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#ifndef EXCLUDE_MIDI
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if (src & 4)
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sb16midiintr (unit); /* MPU401 interrupt */
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#endif
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#endif
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if (!(src & 1))
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return; /* Not a DSP interupt */
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}
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#endif
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status = INB (DSP_DATA_AVAIL); /* Clear interrupt */
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if (sb_intr_active)
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switch (sb_irq_mode)
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{
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case IMODE_OUTPUT:
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sb_intr_active = 0;
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DMAbuf_outputintr (my_dev, 1);
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break;
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case IMODE_INPUT:
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sb_intr_active = 0;
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DMAbuf_inputintr (my_dev);
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/* A complete buffer has been input. Let's start new one */
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break;
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case IMODE_INIT:
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sb_intr_active = 0;
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irq_ok = 1;
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break;
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case IMODE_MIDI:
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printk ("+");
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data = INB (DSP_READ);
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printk ("%x", data);
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break;
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default:
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printk ("SoundBlaster: Unexpected interrupt\n");
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}
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}
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static int sb_irq_usecount = 0;
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int
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sb_get_irq (void)
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{
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int ok;
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if (!sb_irq_usecount)
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if ((ok = snd_set_irq_handler (sbc_irq, sbintr)) < 0)
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return ok;
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sb_irq_usecount++;
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return 0;
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}
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void
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sb_free_irq (void)
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{
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if (!sb_irq_usecount)
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return;
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sb_irq_usecount--;
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if (!sb_irq_usecount)
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snd_release_irq (sbc_irq);
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}
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int
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sb_reset_dsp (void)
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{
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int loopc;
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OUTB (1, DSP_RESET);
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tenmicrosec ();
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OUTB (0, DSP_RESET);
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tenmicrosec ();
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tenmicrosec ();
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tenmicrosec ();
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for (loopc = 0; loopc < 1000 && !(INB (DSP_DATA_AVAIL) & 0x80); loopc++); /* Wait for data
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* available status */
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if (INB (DSP_READ) != 0xAA)
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return 0; /* Sorry */
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return 1;
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}
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#endif
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#ifndef EXCLUDE_AUDIO
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static void
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dsp_speaker (char state)
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{
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if (state)
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sb_dsp_command (DSP_CMD_SPKON);
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else
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sb_dsp_command (DSP_CMD_SPKOFF);
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}
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static int
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dsp_speed (int speed)
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{
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unsigned char tconst;
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unsigned long flags;
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if (speed < 4000)
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speed = 4000;
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if (speed > 44100)
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speed = 44100; /* Invalid speed */
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if (sb_dsp_model == 1 && speed > 22050)
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speed = 22050;
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/* SB Classic doesn't support higher speed */
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if (dsp_stereo && speed > 22050)
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speed = 22050;
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/* Max. stereo speed is 22050 */
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if ((speed > 22050) && sb_midi_busy)
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{
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printk ("SB Warning: High speed DSP not possible simultaneously with MIDI output\n");
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speed = 22050;
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}
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if (dsp_stereo)
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speed *= 2;
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/* Now the speed should be valid */
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if (speed > 22050)
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{ /* High speed mode */
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int tmp;
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tconst = (unsigned char) ((65536 -
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((256000000 + speed / 2) / speed)) >> 8);
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sb_dsp_highspeed = 1;
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DISABLE_INTR (flags);
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if (sb_dsp_command (0x40))
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sb_dsp_command (tconst);
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RESTORE_INTR (flags);
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tmp = 65536 - (tconst << 8);
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speed = (256000000 + tmp / 2) / tmp;
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}
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else
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{
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int tmp;
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sb_dsp_highspeed = 0;
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tconst = (256 - ((1000000 + speed / 2) / speed)) & 0xff;
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DISABLE_INTR (flags);
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if (sb_dsp_command (0x40)) /* Set time constant */
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sb_dsp_command (tconst);
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RESTORE_INTR (flags);
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tmp = 256 - tconst;
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speed = (1000000 + tmp / 2) / tmp;
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}
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if (dsp_stereo)
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speed /= 2;
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dsp_current_speed = speed;
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return speed;
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}
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static int
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dsp_set_stereo (int mode)
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{
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dsp_stereo = 0;
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#ifdef EXCLUDE_SBPRO
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return 0;
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#else
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if (sb_dsp_model < 3 || sb16)
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return 0; /* Sorry no stereo */
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if (mode && sb_midi_busy)
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{
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printk ("SB Warning: Stereo DSP not possible simultaneously with MIDI output\n");
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return 0;
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}
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dsp_stereo = !!mode;
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return dsp_stereo;
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#endif
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}
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static void
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sb_dsp_output_block (int dev, unsigned long buf, int count,
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int intrflag, int restart_dma)
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{
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unsigned long flags;
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if (!sb_irq_mode)
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dsp_speaker (ON);
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sb_irq_mode = IMODE_OUTPUT;
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DMAbuf_start_dma (dev, buf, count, DMA_MODE_WRITE);
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if (sound_dsp_dmachan[dev] > 3)
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count >>= 1;
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count--;
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if (sb_dsp_highspeed)
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{
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DISABLE_INTR (flags);
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if (sb_dsp_command (0x48)) /* High speed size */
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{
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sb_dsp_command ((unsigned char) (count & 0xff));
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sb_dsp_command ((unsigned char) ((count >> 8) & 0xff));
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sb_dsp_command (0x91); /* High speed 8 bit DAC */
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}
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else
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printk ("SB Error: Unable to start (high speed) DAC\n");
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RESTORE_INTR (flags);
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}
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else
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{
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DISABLE_INTR (flags);
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if (sb_dsp_command (0x14)) /* 8-bit DAC (DMA) */
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{
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sb_dsp_command ((unsigned char) (count & 0xff));
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sb_dsp_command ((unsigned char) ((count >> 8) & 0xff));
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}
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else
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printk ("SB Error: Unable to start DAC\n");
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RESTORE_INTR (flags);
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}
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sb_intr_active = 1;
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}
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static void
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sb_dsp_start_input (int dev, unsigned long buf, int count, int intrflag,
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int restart_dma)
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{
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/* Start a DMA input to the buffer pointed by dmaqtail */
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unsigned long flags;
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if (!sb_irq_mode)
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dsp_speaker (OFF);
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sb_irq_mode = IMODE_INPUT;
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DMAbuf_start_dma (dev, buf, count, DMA_MODE_READ);
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if (sound_dsp_dmachan[dev] > 3)
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count >>= 1;
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count--;
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if (sb_dsp_highspeed)
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{
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DISABLE_INTR (flags);
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if (sb_dsp_command (0x48)) /* High speed size */
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{
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sb_dsp_command ((unsigned char) (count & 0xff));
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sb_dsp_command ((unsigned char) ((count >> 8) & 0xff));
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sb_dsp_command (0x99); /* High speed 8 bit ADC */
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}
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else
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printk ("SB Error: Unable to start (high speed) ADC\n");
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RESTORE_INTR (flags);
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}
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else
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{
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DISABLE_INTR (flags);
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if (sb_dsp_command (0x24)) /* 8-bit ADC (DMA) */
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{
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sb_dsp_command ((unsigned char) (count & 0xff));
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sb_dsp_command ((unsigned char) ((count >> 8) & 0xff));
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}
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else
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printk ("SB Error: Unable to start ADC\n");
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RESTORE_INTR (flags);
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}
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sb_intr_active = 1;
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}
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static void
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dsp_cleanup (void)
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{
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sb_intr_active = 0;
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}
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static int
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sb_dsp_prepare_for_input (int dev, int bsize, int bcount)
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{
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dsp_cleanup ();
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dsp_speaker (OFF);
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if (major == 3) /* SB Pro */
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{
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if (dsp_stereo)
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sb_dsp_command (0xa8);
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else
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sb_dsp_command (0xa0);
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dsp_speed (dsp_current_speed); /* Speed must be recalculated if #channels
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* changes */
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}
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return 0;
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}
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static int
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sb_dsp_prepare_for_output (int dev, int bsize, int bcount)
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{
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dsp_cleanup ();
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dsp_speaker (ON);
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#ifndef EXCLUDE_SBPRO
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if (major == 3) /* SB Pro */
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{
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sb_mixer_set_stereo (dsp_stereo);
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dsp_speed (dsp_current_speed); /* Speed must be recalculated if #channels
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* changes */
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}
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#endif
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return 0;
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}
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static void
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sb_dsp_halt_xfer (int dev)
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{
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}
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static int
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verify_irq (void)
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{
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#if 0
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DEFINE_WAIT_QUEUE (testq, testf);
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irq_ok = 0;
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if (sb_get_irq () == -1)
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{
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printk ("*** SB Error: Irq %d already in use\n", sbc_irq);
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return 0;
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}
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sb_irq_mode = IMODE_INIT;
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sb_dsp_command (0xf2); /* This should cause immediate interrupt */
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DO_SLEEP (testq, testf, HZ / 5);
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sb_free_irq ();
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if (!irq_ok)
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{
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printk ("SB Warning: IRQ%d test not passed!", sbc_irq);
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irq_ok = 1;
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}
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#else
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irq_ok = 1;
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#endif
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return irq_ok;
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}
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static int
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sb_dsp_open (int dev, int mode)
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{
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int retval;
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if (!sb_dsp_ok)
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{
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printk ("SB Error: SoundBlaster board not installed\n");
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return RET_ERROR (ENXIO);
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}
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if (sb_intr_active || (sb_midi_busy && sb_midi_mode == UART_MIDI))
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{
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printk ("SB: PCM not possible during MIDI input\n");
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return RET_ERROR (EBUSY);
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}
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if (!irq_verified)
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{
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verify_irq ();
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irq_verified = 1;
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}
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else if (!irq_ok)
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printk ("SB Warning: Incorrect IRQ setting %d\n",
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sbc_irq);
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retval = sb_get_irq ();
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if (retval)
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return retval;
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if (!DMAbuf_open_dma (dev))
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{
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sb_free_irq ();
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printk ("SB: DMA Busy\n");
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return RET_ERROR (EBUSY);
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}
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sb_irq_mode = IMODE_NONE;
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sb_dsp_busy = 1;
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return 0;
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}
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static void
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sb_dsp_close (int dev)
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{
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DMAbuf_close_dma (dev);
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sb_free_irq ();
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dsp_cleanup ();
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dsp_speaker (OFF);
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sb_dsp_busy = 0;
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sb_dsp_highspeed = 0;
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}
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static int
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sb_dsp_ioctl (int dev, unsigned int cmd, unsigned int arg, int local)
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{
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switch (cmd)
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{
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case SOUND_PCM_WRITE_RATE:
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if (local)
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return dsp_speed (arg);
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return IOCTL_OUT (arg, dsp_speed (IOCTL_IN (arg)));
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break;
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case SOUND_PCM_READ_RATE:
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if (local)
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return dsp_current_speed;
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return IOCTL_OUT (arg, dsp_current_speed);
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break;
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case SOUND_PCM_WRITE_CHANNELS:
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if (local)
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return dsp_set_stereo (arg - 1) + 1;
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return IOCTL_OUT (arg, dsp_set_stereo (IOCTL_IN (arg) - 1) + 1);
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break;
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case SOUND_PCM_READ_CHANNELS:
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if (local)
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return dsp_stereo + 1;
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return IOCTL_OUT (arg, dsp_stereo + 1);
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break;
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case SNDCTL_DSP_STEREO:
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if (local)
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return dsp_set_stereo (arg);
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return IOCTL_OUT (arg, dsp_set_stereo (IOCTL_IN (arg)));
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break;
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case SOUND_PCM_WRITE_BITS:
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case SOUND_PCM_READ_BITS:
|
|
if (local)
|
|
return 8;
|
|
return IOCTL_OUT (arg, 8); /* Only 8 bits/sample supported */
|
|
break;
|
|
|
|
case SOUND_PCM_WRITE_FILTER:
|
|
case SOUND_PCM_READ_FILTER:
|
|
return RET_ERROR (EINVAL);
|
|
break;
|
|
|
|
default:
|
|
return RET_ERROR (EINVAL);
|
|
}
|
|
|
|
return RET_ERROR (EINVAL);
|
|
}
|
|
|
|
static void
|
|
sb_dsp_reset (int dev)
|
|
{
|
|
unsigned long flags;
|
|
|
|
DISABLE_INTR (flags);
|
|
|
|
sb_reset_dsp ();
|
|
dsp_cleanup ();
|
|
|
|
RESTORE_INTR (flags);
|
|
}
|
|
|
|
#endif
|
|
|
|
int
|
|
sb_dsp_detect (struct address_info *hw_config)
|
|
{
|
|
sbc_base = hw_config->io_base;
|
|
sbc_irq = hw_config->irq;
|
|
|
|
if (sb_dsp_ok)
|
|
return 0; /* Already initialized */
|
|
|
|
if (!sb_reset_dsp ())
|
|
return 0;
|
|
|
|
return 1; /* Detected */
|
|
}
|
|
|
|
#ifndef EXCLUDE_AUDIO
|
|
struct audio_operations sb_dsp_operations =
|
|
{
|
|
"SoundBlaster",
|
|
sb_dsp_open,
|
|
sb_dsp_close,
|
|
sb_dsp_output_block,
|
|
sb_dsp_start_input,
|
|
sb_dsp_ioctl,
|
|
sb_dsp_prepare_for_input,
|
|
sb_dsp_prepare_for_output,
|
|
sb_dsp_reset,
|
|
sb_dsp_halt_xfer,
|
|
NULL, /* has_output_drained */
|
|
NULL /* copy_from_user */
|
|
};
|
|
|
|
#endif
|
|
|
|
long
|
|
sb_dsp_init (long mem_start, struct address_info *hw_config)
|
|
{
|
|
int i;
|
|
|
|
major = minor = 0;
|
|
sb_dsp_command (0xe1); /* Get version */
|
|
|
|
for (i = 1000; i; i--)
|
|
{
|
|
if (INB (DSP_DATA_AVAIL) & 0x80)
|
|
{ /* wait for Data Ready */
|
|
if (major == 0)
|
|
major = INB (DSP_READ);
|
|
else
|
|
{
|
|
minor = INB (DSP_READ);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (major == 2 || major == 3)
|
|
sb_duplex_midi = 1;
|
|
|
|
if (major == 4)
|
|
sb16 = 1;
|
|
|
|
sb_dsp_model = major;
|
|
|
|
#ifndef EXCLUDE_SBPRO
|
|
if (major >= 3)
|
|
sb_mixer_init (major);
|
|
#endif
|
|
|
|
#ifndef EXCLUDE_YM3812
|
|
if (major > 3 || (major == 3 && minor > 0)) /* SB Pro2 or later */
|
|
{
|
|
enable_opl3_mode (OPL3_LEFT, OPL3_RIGHT, OPL3_BOTH);
|
|
}
|
|
#endif
|
|
|
|
if (major >= 3)
|
|
{
|
|
#ifndef SCO
|
|
sprintf (sb_dsp_operations.name, "SoundBlaster Pro %d.%d", major, minor);
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
#ifndef SCO
|
|
sprintf (sb_dsp_operations.name, "SoundBlaster %d.%d", major, minor);
|
|
#endif
|
|
}
|
|
|
|
printk ("snd2: <%s>", sb_dsp_operations.name);
|
|
|
|
#ifndef EXCLUDE_AUDIO
|
|
#if !defined(EXCLUDE_SB16) && !defined(EXCLUDE_SBPRO)
|
|
if (!sb16) /* There is a better driver for SB16 */
|
|
#endif
|
|
if (num_dspdevs < MAX_DSP_DEV)
|
|
{
|
|
dsp_devs[my_dev = num_dspdevs++] = &sb_dsp_operations;
|
|
sound_buffcounts[my_dev] = DSP_BUFFCOUNT;
|
|
sound_buffsizes[my_dev] = DSP_BUFFSIZE;
|
|
sound_dsp_dmachan[my_dev] = hw_config->dma;
|
|
sound_dma_automode[my_dev] = 0;
|
|
}
|
|
else
|
|
printk ("SB: Too many DSP devices available\n");
|
|
#endif
|
|
|
|
#ifndef EXCLUDE_MIDI
|
|
if (!midi_disabled && !sb16) /* Midi don't work in the SB emulation mode
|
|
* of PAS, SB16 has better midi interface */
|
|
sb_midi_init (major);
|
|
#endif
|
|
|
|
sb_dsp_ok = 1;
|
|
return mem_start;
|
|
}
|
|
|
|
void
|
|
sb_dsp_disable_midi (void)
|
|
{
|
|
midi_disabled = 1;
|
|
}
|
|
|
|
#endif
|