47d4076d8f
The U6850* changes in sound_config.h are probably wrong. Recent commits lost: - include paths. - copyrights. - cvs Ids. - infamous whitespace changes. - other cosmetic changes.
328 lines
6.8 KiB
C
328 lines
6.8 KiB
C
/*
|
|
* sound/uart6850.c
|
|
*
|
|
* Copyright by Hannu Savolainen 1993
|
|
*
|
|
* Mon Nov 22 22:38:35 MET 1993 marco@driq.home.usn.nl:
|
|
* added 6850 support, used with COVOX SoundMaster II and custom cards.
|
|
*
|
|
* 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_UART6850) && !defined(EXCLUDE_MIDI)
|
|
|
|
#define DATAPORT (uart6850_base) /*
|
|
* * * Midi6850 Data I/O Port on IBM
|
|
* */
|
|
#define COMDPORT (uart6850_base+1) /*
|
|
* * * Midi6850 Command Port on IBM */
|
|
#define STATPORT (uart6850_base+1) /*
|
|
* * * Midi6850 Status Port on IBM */
|
|
|
|
#define uart6850_status() INB(STATPORT)
|
|
#define input_avail() ((uart6850_status()&INPUT_AVAIL))
|
|
#define output_ready() ((uart6850_status()&OUTPUT_READY))
|
|
#define uart6850_cmd(cmd) OUTB(cmd, COMDPORT)
|
|
#define uart6850_read() INB(DATAPORT)
|
|
#define uart6850_write(byte) OUTB(byte, DATAPORT)
|
|
|
|
#define OUTPUT_READY 0x02 /*
|
|
* * * Mask for Data Read Ready Bit */
|
|
#define INPUT_AVAIL 0x01 /*
|
|
* * * Mask for Data Send Ready Bit */
|
|
|
|
#define UART_RESET 0x95 /*
|
|
* * * 6850 Total Reset Command */
|
|
#define UART_MODE_ON 0x03 /*
|
|
* * * 6850 Send/Receive UART Mode */
|
|
|
|
static int uart6850_opened = 0;
|
|
static int uart6850_base = 0x330;
|
|
static int uart6850_irq;
|
|
static int uart6850_detected = 0;
|
|
static int my_dev;
|
|
|
|
static int reset_uart6850 (void);
|
|
static void (*midi_input_intr) (int dev, unsigned char data);
|
|
|
|
static void
|
|
uart6850_input_loop (void)
|
|
{
|
|
int count;
|
|
|
|
count = 10;
|
|
|
|
while (count) /*
|
|
* Not timed out
|
|
*/
|
|
if (input_avail ())
|
|
{
|
|
unsigned char c = uart6850_read ();
|
|
|
|
count = 100;
|
|
|
|
if (uart6850_opened & OPEN_READ)
|
|
midi_input_intr (my_dev, c);
|
|
}
|
|
else
|
|
while (!input_avail () && count)
|
|
count--;
|
|
}
|
|
|
|
void
|
|
m6850intr (int unit)
|
|
{
|
|
if (input_avail ())
|
|
uart6850_input_loop ();
|
|
}
|
|
|
|
/*
|
|
* It looks like there is no input interrupts in the UART mode. Let's try
|
|
* polling.
|
|
*/
|
|
|
|
static void
|
|
poll_uart6850 (unsigned long dummy)
|
|
{
|
|
unsigned long flags;
|
|
|
|
DEFINE_TIMER (uart6850_timer, poll_uart6850);
|
|
|
|
if (!(uart6850_opened & OPEN_READ))
|
|
return; /*
|
|
* No longer required
|
|
*/
|
|
|
|
DISABLE_INTR (flags);
|
|
|
|
if (input_avail ())
|
|
uart6850_input_loop ();
|
|
|
|
ACTIVATE_TIMER (uart6850_timer, poll_uart6850, 1); /*
|
|
* Come back later
|
|
*/
|
|
|
|
RESTORE_INTR (flags);
|
|
}
|
|
|
|
static int
|
|
uart6850_open (int dev, int mode,
|
|
void (*input) (int dev, unsigned char data),
|
|
void (*output) (int dev)
|
|
)
|
|
{
|
|
if (uart6850_opened)
|
|
{
|
|
printk ("Midi6850: Midi busy\n");
|
|
return RET_ERROR (EBUSY);
|
|
}
|
|
|
|
uart6850_cmd (UART_RESET);
|
|
|
|
uart6850_input_loop ();
|
|
|
|
midi_input_intr = input;
|
|
uart6850_opened = mode;
|
|
poll_uart6850 (0); /*
|
|
* Enable input polling
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
uart6850_close (int dev)
|
|
{
|
|
uart6850_cmd (UART_MODE_ON);
|
|
|
|
uart6850_opened = 0;
|
|
}
|
|
|
|
static int
|
|
uart6850_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 ())
|
|
uart6850_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 ("Midi6850: Timeout\n");
|
|
return 0;
|
|
}
|
|
|
|
uart6850_write (midi_byte);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
uart6850_command (int dev, unsigned char *midi_byte)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
uart6850_start_read (int dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
uart6850_end_read (int dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
uart6850_ioctl (int dev, unsigned cmd, unsigned arg)
|
|
{
|
|
return RET_ERROR (EINVAL);
|
|
}
|
|
|
|
static void
|
|
uart6850_kick (int dev)
|
|
{
|
|
}
|
|
|
|
static int
|
|
uart6850_buffer_status (int dev)
|
|
{
|
|
return 0; /*
|
|
* No data in buffers
|
|
*/
|
|
}
|
|
|
|
#define MIDI_SYNTH_NAME "6850 UART Midi"
|
|
#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
|
|
#include "midi_synth.h"
|
|
|
|
static struct midi_operations uart6850_operations =
|
|
{
|
|
{"6850 UART", 0, 0, SNDCARD_UART6850},
|
|
&std_midi_synth,
|
|
{0},
|
|
uart6850_open,
|
|
uart6850_close,
|
|
uart6850_ioctl,
|
|
uart6850_out,
|
|
uart6850_start_read,
|
|
uart6850_end_read,
|
|
uart6850_kick,
|
|
uart6850_command,
|
|
uart6850_buffer_status
|
|
};
|
|
|
|
|
|
long
|
|
attach_uart6850 (long mem_start, struct address_info *hw_config)
|
|
{
|
|
int ok, timeout;
|
|
unsigned long flags;
|
|
|
|
if (num_midis >= MAX_MIDI_DEV)
|
|
{
|
|
printk ("Sound: Too many midi devices detected\n");
|
|
return mem_start;
|
|
}
|
|
|
|
uart6850_base = hw_config->io_base;
|
|
uart6850_irq = hw_config->irq;
|
|
|
|
if (!uart6850_detected)
|
|
return RET_ERROR (EIO);
|
|
|
|
DISABLE_INTR (flags);
|
|
|
|
for (timeout = 30000; timeout < 0 && !output_ready (); timeout--); /*
|
|
* Wait
|
|
*/
|
|
uart6850_cmd (UART_MODE_ON);
|
|
|
|
ok = 1;
|
|
|
|
RESTORE_INTR (flags);
|
|
|
|
#if defined(__FreeBSD__)
|
|
printk ("uart0: <6850 Midi Interface>");
|
|
#else
|
|
printk (" <6850 Midi Interface>");
|
|
#endif
|
|
|
|
std_midi_synth.midi_dev = my_dev = num_midis;
|
|
midi_devs[num_midis++] = &uart6850_operations;
|
|
return mem_start;
|
|
}
|
|
|
|
static int
|
|
reset_uart6850 (void)
|
|
{
|
|
uart6850_read ();
|
|
return 1; /*
|
|
* OK
|
|
*/
|
|
}
|
|
|
|
|
|
int
|
|
probe_uart6850 (struct address_info *hw_config)
|
|
{
|
|
int ok = 0;
|
|
|
|
uart6850_base = hw_config->io_base;
|
|
uart6850_irq = hw_config->irq;
|
|
|
|
if (snd_set_irq_handler (uart6850_irq, m6850intr, "MIDI6850") < 0)
|
|
return 0;
|
|
|
|
ok = reset_uart6850 ();
|
|
|
|
uart6850_detected = ok;
|
|
return ok;
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|