322 lines
7.0 KiB
C
322 lines
7.0 KiB
C
/*
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* sound/mpu401.c
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*
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* The low level driver for Roland MPU-401 compatible Midi cards.
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*
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* This version supports just the DUMB UART mode.
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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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#ifdef CONFIGURE_SOUNDCARD
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#if !defined(EXCLUDE_MPU401) && !defined(EXCLUDE_MIDI)
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#define DATAPORT (mpu401_base) /* MPU-401 Data I/O Port on IBM */
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#define COMDPORT (mpu401_base+1) /* MPU-401 Command Port on IBM */
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#define STATPORT (mpu401_base+1) /* MPU-401 Status Port on IBM */
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#define mpu401_status() INB(STATPORT)
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#define input_avail() (!(mpu401_status()&INPUT_AVAIL))
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#define output_ready() (!(mpu401_status()&OUTPUT_READY))
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#define mpu401_cmd(cmd) OUTB(cmd, COMDPORT)
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#define mpu401_read() INB(DATAPORT)
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#define mpu401_write(byte) OUTB(byte, DATAPORT)
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#define OUTPUT_READY 0x40 /* Mask for Data Read Redy Bit */
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#define INPUT_AVAIL 0x80 /* Mask for Data Send Ready Bit */
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#define MPU_ACK 0xFE /* MPU-401 Acknowledge Response */
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#define MPU_RESET 0xFF /* MPU-401 Total Reset Command */
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#define UART_MODE_ON 0x3F /* MPU-401 "Dumb UART Mode" */
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static int mpu401_opened = 0;
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static int mpu401_base = 0x330;
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static int mpu401_irq;
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static int mpu401_detected = 0;
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static int my_dev;
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static int reset_mpu401 (void);
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static void (*midi_input_intr) (int dev, unsigned char data);
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static void
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mpu401_input_loop (void)
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{
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int count;
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count = 10;
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while (count) /* Not timed out */
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if (input_avail ())
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{
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unsigned char c = mpu401_read ();
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count = 100;
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if (mpu401_opened & OPEN_READ)
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midi_input_intr (my_dev, c);
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}
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else
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while (!input_avail () && count)
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count--;
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}
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void
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mpuintr (int unit)
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{
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if (input_avail ())
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mpu401_input_loop ();
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}
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/*
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* It looks like there is no input interrupts in the UART mode. Let's try
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* polling.
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*/
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static void
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poll_mpu401 (unsigned long dummy)
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{
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unsigned long flags;
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DEFINE_TIMER (mpu401_timer, poll_mpu401);
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if (!(mpu401_opened & OPEN_READ))
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return; /* No longer required */
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DISABLE_INTR (flags);
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if (input_avail ())
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mpu401_input_loop ();
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ACTIVATE_TIMER (mpu401_timer, poll_mpu401, 1); /* Come back later */
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RESTORE_INTR (flags);
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}
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static int
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mpu401_open (int dev, int mode,
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void (*input) (int dev, unsigned char data),
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void (*output) (int dev)
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)
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{
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if (mpu401_opened)
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{
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printk ("MPU-401: Midi busy\n");
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return RET_ERROR (EBUSY);
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}
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mpu401_input_loop ();
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midi_input_intr = input;
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mpu401_opened = mode;
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poll_mpu401 (0); /* Enable input polling */
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return 0;
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}
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static void
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mpu401_close (int dev)
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{
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mpu401_opened = 0;
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}
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static int
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mpu401_out (int dev, unsigned char midi_byte)
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{
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int timeout;
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unsigned long flags;
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/*
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* Test for input since pending input seems to block the output.
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*/
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DISABLE_INTR (flags);
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if (input_avail ())
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mpu401_input_loop ();
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RESTORE_INTR (flags);
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/*
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* Sometimes it takes about 13000 loops before the output becomes ready
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* (After reset). Normally it takes just about 10 loops.
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*/
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for (timeout = 30000; timeout > 0 && !output_ready (); timeout--); /* Wait */
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if (!output_ready ())
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{
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printk ("MPU-401: Timeout\n");
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return 0;
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}
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mpu401_write (midi_byte);
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return 1;
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}
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static int
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mpu401_command (int dev, unsigned char midi_byte)
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{
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return 1;
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}
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static int
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mpu401_start_read (int dev)
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{
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return 0;
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}
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static int
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mpu401_end_read (int dev)
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{
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return 0;
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}
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static int
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mpu401_ioctl (int dev, unsigned cmd, unsigned arg)
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{
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return RET_ERROR (EINVAL);
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}
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static void
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mpu401_kick (int dev)
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{
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}
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static int
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mpu401_buffer_status (int dev)
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{
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return 0; /* No data in buffers */
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}
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static struct midi_operations mpu401_operations =
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{
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{"MPU-401", 0, 0, SNDCARD_MPU401},
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mpu401_open,
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mpu401_close,
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mpu401_ioctl,
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mpu401_out,
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mpu401_start_read,
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mpu401_end_read,
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mpu401_kick,
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mpu401_command,
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mpu401_buffer_status
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};
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long
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attach_mpu401 (long mem_start, struct address_info *hw_config)
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{
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int ok, timeout;
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unsigned long flags;
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mpu401_base = hw_config->io_base;
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mpu401_irq = hw_config->irq;
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if (!mpu401_detected)
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return RET_ERROR (EIO);
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DISABLE_INTR (flags);
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for (timeout = 30000; timeout < 0 && !output_ready (); timeout--); /* Wait */
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mpu401_cmd (UART_MODE_ON);
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ok = 0;
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for (timeout = 50000; timeout > 0 && !ok; timeout--)
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if (input_avail ())
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if (mpu401_read () == MPU_ACK)
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ok = 1;
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RESTORE_INTR (flags);
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printk ("snd5: <Roland MPU-401>");
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my_dev = num_midis;
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mpu401_dev = num_midis;
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midi_devs[num_midis++] = &mpu401_operations;
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return mem_start;
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}
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static int
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reset_mpu401 (void)
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{
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unsigned long flags;
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int ok, timeout, n;
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/*
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* Send the RESET command. Try again if no success at the first time.
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*/
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ok = 0;
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DISABLE_INTR (flags);
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for (n = 0; n < 2 && !ok; n++)
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{
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for (timeout = 30000; timeout < 0 && !output_ready (); timeout--); /* Wait */
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mpu401_cmd (MPU_RESET); /* Send MPU-401 RESET Command */
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/*
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* Wait at least 25 msec. This method is not accurate so let's make the
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* loop bit longer. Cannot sleep since this is called during boot.
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*/
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for (timeout = 50000; timeout > 0 && !ok; timeout--)
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if (input_avail ())
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if (mpu401_read () == MPU_ACK)
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ok = 1;
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}
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mpu401_opened = 0;
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if (ok)
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mpu401_input_loop (); /* Flush input before enabling interrupts */
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RESTORE_INTR (flags);
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return ok;
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}
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int
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probe_mpu401 (struct address_info *hw_config)
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{
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int ok = 0;
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mpu401_base = hw_config->io_base;
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mpu401_irq = hw_config->irq;
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if (snd_set_irq_handler (mpu401_irq, mpuintr) < 0)
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return 0;
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ok = reset_mpu401 ();
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mpu401_detected = ok;
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return ok;
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}
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#endif
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#endif
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