* 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
#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 reset_sb16midi (void);
static void (*midi_input_intr
) (int dev
, unsigned char data
);
sb16midi_input_loop (void)
unsigned char c
= sb16midi_read ();
if (sb16midi_opened
& OPEN_READ
)
midi_input_intr (my_dev
, c
);
sb16midi_open (int dev
, int mode
,
void (*input
) (int dev
, unsigned char data
),
return RET_ERROR (EBUSY
);
sb16midi_out (int dev
, unsigned char midi_byte
)
* Test for input since pending input seems to block the output.
* 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 */
printk ("MPU-401: Timeout\n");
sb16midi_write (midi_byte
);
sb16midi_command (int dev
, unsigned char midi_byte
)
sb16midi_start_read (int dev
)
sb16midi_end_read (int dev
)
sb16midi_ioctl (int dev
, unsigned cmd
, unsigned arg
)
return RET_ERROR (EINVAL
);
sb16midi_buffer_status (int dev
)
return 0; /* No data in buffers */
static struct midi_operations sb16midi_operations
=
{"SoundBlaster MPU-401", 0, 0, SNDCARD_SB16MIDI
},
attach_sb16midi (long mem_start
, struct address_info
*hw_config
)
sb16midi_base
= hw_config
->io_base
;
for (timeout
= 30000; timeout
< 0 && !output_ready (); timeout
--); /* Wait */
sb16midi_cmd (UART_MODE_ON
);
for (timeout
= 50000; timeout
> 0 && !ok
; timeout
--)
if (sb16midi_read () == MPU_ACK
)
printk ("snd7: <SoundBlaster MPU-401>");
printk (" <SoundBlaster MPU-401>");
midi_devs
[num_midis
++] = &sb16midi_operations
;
* Send the RESET command. Try again if no success at the first time.
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 (sb16midi_read () == MPU_ACK
)
sb16midi_input_loop (); /* Flush input before enabling interrupts */
probe_sb16midi (struct address_info
*hw_config
)
sb16midi_base
= hw_config
->io_base
;
return 0; /* SB16 not detected */