freebsd-dev/sys/i386/isa/sound/sb16_midi.c
Steven Wallace a75ba8fa22 Integrated Hannu Savolainen's new VoxWare sound drivers, version 2.4.
These drivers now have full SoundBlaster 16 support.
1994-03-11 10:27:25 +00:00

315 lines
6.9 KiB
C

/*
* sound/sb16_midi.c
*
* The low level driver for the MPU-401 UART emulation of the SB16.
*
* Copyright by Hannu Savolainen 1993
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer. 2.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include "sound_config.h"
#ifdef CONFIGURE_SOUNDCARD
#if !defined(EXCLUDE_SB) && !defined(EXCLUDE_SB16) && !defined(EXCLUDE_MIDI)
#define DATAPORT (sb16midi_base) /* MPU-401 Data I/O Port on IBM */
#define COMDPORT (sb16midi_base+1) /* MPU-401 Command Port on IBM */
#define STATPORT (sb16midi_base+1) /* MPU-401 Status Port on IBM */
#define sb16midi_status() INB(STATPORT)
#define input_avail() (!(sb16midi_status()&INPUT_AVAIL))
#define output_ready() (!(sb16midi_status()&OUTPUT_READY))
#define sb16midi_cmd(cmd) OUTB(cmd, COMDPORT)
#define sb16midi_read() INB(DATAPORT)
#define sb16midi_write(byte) OUTB(byte, DATAPORT)
#define OUTPUT_READY 0x40 /* Mask for Data Read Redy Bit */
#define INPUT_AVAIL 0x80 /* Mask for Data Send Ready Bit */
#define MPU_ACK 0xFE /* MPU-401 Acknowledge Response */
#define MPU_RESET 0xFF /* MPU-401 Total Reset Command */
#define UART_MODE_ON 0x3F /* MPU-401 "Dumb UART Mode" */
static int sb16midi_opened = 0;
static int sb16midi_base = 0x330;
static int sb16midi_detected = 0;
static int my_dev;
static int reset_sb16midi (void);
static void (*midi_input_intr) (int dev, unsigned char data);
static void
sb16midi_input_loop (void)
{
int count;
count = 10;
while (count) /* Not timed out */
if (input_avail ())
{
unsigned char c = sb16midi_read ();
count = 100;
if (sb16midi_opened & OPEN_READ)
midi_input_intr (my_dev, c);
}
else
while (!input_avail () && count)
count--;
}
void
sb16midiintr (int unit)
{
if (input_avail ())
sb16midi_input_loop ();
}
/*
* It looks like there is no input interrupts in the UART mode. Let's try
* polling.
*/
static void
poll_sb16midi (unsigned long dummy)
{
unsigned long flags;
DEFINE_TIMER (sb16midi_timer, poll_sb16midi);
if (!(sb16midi_opened & OPEN_READ))
return; /* No longer required */
DISABLE_INTR (flags);
if (input_avail ())
sb16midi_input_loop ();
ACTIVATE_TIMER (sb16midi_timer, poll_sb16midi, 1); /* Come back later */
RESTORE_INTR (flags);
}
static int
sb16midi_open (int dev, int mode,
void (*input) (int dev, unsigned char data),
void (*output) (int dev)
)
{
if (sb16midi_opened)
{
return RET_ERROR (EBUSY);
}
sb16midi_input_loop ();
midi_input_intr = input;
sb16midi_opened = mode;
poll_sb16midi (0); /* Enable input polling */
return 0;
}
static void
sb16midi_close (int dev)
{
sb16midi_opened = 0;
}
static int
sb16midi_out (int dev, unsigned char midi_byte)
{
int timeout;
unsigned long flags;
/*
* Test for input since pending input seems to block the output.
*/
DISABLE_INTR (flags);
if (input_avail ())
sb16midi_input_loop ();
RESTORE_INTR (flags);
/*
* Sometimes it takes about 13000 loops before the output becomes ready
* (After reset). Normally it takes just about 10 loops.
*/
for (timeout = 30000; timeout > 0 && !output_ready (); timeout--); /* Wait */
if (!output_ready ())
{
printk ("MPU-401: Timeout\n");
return 0;
}
sb16midi_write (midi_byte);
return 1;
}
static int
sb16midi_command (int dev, unsigned char midi_byte)
{
return 1;
}
static int
sb16midi_start_read (int dev)
{
return 0;
}
static int
sb16midi_end_read (int dev)
{
return 0;
}
static int
sb16midi_ioctl (int dev, unsigned cmd, unsigned arg)
{
return RET_ERROR (EINVAL);
}
static void
sb16midi_kick (int dev)
{
}
static int
sb16midi_buffer_status (int dev)
{
return 0; /* No data in buffers */
}
static struct midi_operations sb16midi_operations =
{
{"SoundBlaster MPU-401", 0, 0, SNDCARD_SB16MIDI},
sb16midi_open,
sb16midi_close,
sb16midi_ioctl,
sb16midi_out,
sb16midi_start_read,
sb16midi_end_read,
sb16midi_kick,
sb16midi_command,
sb16midi_buffer_status
};
long
attach_sb16midi (long mem_start, struct address_info *hw_config)
{
int ok, timeout;
unsigned long flags;
sb16midi_base = hw_config->io_base;
if (!sb16midi_detected)
return RET_ERROR (EIO);
DISABLE_INTR (flags);
for (timeout = 30000; timeout < 0 && !output_ready (); timeout--); /* Wait */
sb16midi_cmd (UART_MODE_ON);
ok = 0;
for (timeout = 50000; timeout > 0 && !ok; timeout--)
if (input_avail ())
if (sb16midi_read () == MPU_ACK)
ok = 1;
RESTORE_INTR (flags);
printk ("snd7: <SoundBlaster MPU-401>");
my_dev = num_midis;
midi_devs[num_midis++] = &sb16midi_operations;
return mem_start;
}
static int
reset_sb16midi (void)
{
unsigned long flags;
int ok, timeout, n;
/*
* Send the RESET command. Try again if no success at the first time.
*/
ok = 0;
DISABLE_INTR (flags);
for (n = 0; n < 2 && !ok; n++)
{
for (timeout = 30000; timeout < 0 && !output_ready (); timeout--); /* Wait */
sb16midi_cmd (MPU_RESET); /* Send MPU-401 RESET Command */
/*
* Wait at least 25 msec. This method is not accurate so let's make the
* loop bit longer. Cannot sleep since this is called during boot.
*/
for (timeout = 50000; timeout > 0 && !ok; timeout--)
if (input_avail ())
if (sb16midi_read () == MPU_ACK)
ok = 1;
}
sb16midi_opened = 0;
if (ok)
sb16midi_input_loop (); /* Flush input before enabling interrupts */
RESTORE_INTR (flags);
return ok;
}
int
probe_sb16midi (struct address_info *hw_config)
{
int ok = 0;
sb16midi_base = hw_config->io_base;
if (sb_get_irq () < 0)
return 0;
ok = reset_sb16midi ();
sb16midi_detected = ok;
return ok;
}
#endif
#endif