325 lines
6.8 KiB
C
325 lines
6.8 KiB
C
/*
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* sound/uart6850.c
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*
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* Copyright by Hannu Savolainen 1993
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*
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* Mon Nov 22 22:38:35 MET 1993 marco@driq.home.usn.nl:
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* added 6850 support, used with COVOX SoundMaster II and custom cards.
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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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* $Id: uart6850.c,v 1.7 1994/09/27 17:58:24 davidg Exp $
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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_UART6850) && !defined(EXCLUDE_MIDI)
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#define DATAPORT (uart6850_base) /*
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* * * Midi6850 Data I/O Port on IBM
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* */
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#define COMDPORT (uart6850_base+1) /*
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* * * Midi6850 Command Port on IBM */
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#define STATPORT (uart6850_base+1) /*
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* * * Midi6850 Status Port on IBM */
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#define uart6850_status() INB(STATPORT)
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#define input_avail() ((uart6850_status()&INPUT_AVAIL))
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#define output_ready() ((uart6850_status()&OUTPUT_READY))
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#define uart6850_cmd(cmd) OUTB(cmd, COMDPORT)
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#define uart6850_read() INB(DATAPORT)
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#define uart6850_write(byte) OUTB(byte, DATAPORT)
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#define OUTPUT_READY 0x02 /*
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* * * Mask for Data Read Ready Bit */
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#define INPUT_AVAIL 0x01 /*
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* * * Mask for Data Send Ready Bit */
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#define UART_RESET 0x95 /*
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* * * 6850 Total Reset Command */
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#define UART_MODE_ON 0x03 /*
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* * * 6850 Send/Receive UART Mode */
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static int uart6850_opened = 0;
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static int uart6850_base = 0x330;
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static int uart6850_irq;
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static int uart6850_detected = 0;
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static int my_dev;
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static int reset_uart6850 (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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uart6850_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) /*
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* Not timed out
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*/
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if (input_avail ())
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{
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unsigned char c = uart6850_read ();
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count = 100;
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if (uart6850_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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m6850intr (int unit)
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{
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printk ("M");
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if (input_avail ())
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uart6850_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_uart6850 (unsigned long dummy)
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{
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unsigned long flags;
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DEFINE_TIMER (uart6850_timer, poll_uart6850);
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if (!(uart6850_opened & OPEN_READ))
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return; /*
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* No longer required
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*/
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DISABLE_INTR (flags);
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if (input_avail ())
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uart6850_input_loop ();
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ACTIVATE_TIMER (uart6850_timer, poll_uart6850, 1); /*
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* Come back later
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*/
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RESTORE_INTR (flags);
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}
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static int
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uart6850_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 (uart6850_opened)
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{
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printk ("Midi6850: Midi busy\n");
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return RET_ERROR (EBUSY);
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}
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uart6850_cmd (UART_RESET);
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uart6850_input_loop ();
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midi_input_intr = input;
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uart6850_opened = mode;
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poll_uart6850 (0); /*
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* Enable input polling
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*/
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return 0;
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}
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static void
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uart6850_close (int dev)
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{
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uart6850_cmd (UART_MODE_ON);
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uart6850_opened = 0;
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}
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static int
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uart6850_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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uart6850_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--); /*
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* Wait
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*/
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if (!output_ready ())
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{
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printk ("Midi6850: Timeout\n");
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return 0;
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}
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uart6850_write (midi_byte);
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return 1;
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}
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static int
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uart6850_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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uart6850_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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uart6850_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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uart6850_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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uart6850_kick (int dev)
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{
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}
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static int
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uart6850_buffer_status (int dev)
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{
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return 0; /*
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* No data in buffers
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*/
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}
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#define MIDI_SYNTH_NAME "6850 UART Midi"
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#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
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#include "midi_synth.h"
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static struct midi_operations uart6850_operations =
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{
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{"6850 UART", 0, 0, SNDCARD_UART6850},
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&std_midi_synth,
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uart6850_open,
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uart6850_close,
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uart6850_ioctl,
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uart6850_out,
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uart6850_start_read,
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uart6850_end_read,
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uart6850_kick,
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uart6850_command,
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uart6850_buffer_status
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};
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long
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attach_uart6850 (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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if (num_midis >= MAX_MIDI_DEV)
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{
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printk ("Sound: Too many midi devices detected\n");
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return mem_start;
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}
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uart6850_base = hw_config->io_base;
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uart6850_irq = hw_config->irq;
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if (!uart6850_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--); /*
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* Wait
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*/
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uart6850_cmd (UART_MODE_ON);
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ok = 1;
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RESTORE_INTR (flags);
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printk (" <6850 Midi Interface>");
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std_midi_synth.midi_dev = my_dev = num_midis;
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midi_devs[num_midis++] = &uart6850_operations;
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return mem_start;
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}
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static int
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reset_uart6850 (void)
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{
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uart6850_read ();
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return 1; /*
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* OK
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*/
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}
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int
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probe_uart6850 (struct address_info *hw_config)
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{
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int ok = 0;
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uart6850_base = hw_config->io_base;
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uart6850_irq = hw_config->irq;
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if (snd_set_irq_handler (uart6850_irq, m6850intr) < 0)
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return 0;
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ok = reset_uart6850 ();
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uart6850_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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