/* * 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. * * sb16_midi.c,v 1.4 1994/10/01 02:17:03 swallace Exp */ #include "sound_config.h" #ifdef CONFIGURE_SOUNDCARD #if !defined(EXCLUDE_SB) && !defined(EXCLUDE_SB16MIDI) && !defined(EXCLUDE_MIDI) #include "sb.h" #define DATAPORT (sb16midi_base) #define COMDPORT (sb16midi_base+1) #define STATPORT (sb16midi_base+1) #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 #define INPUT_AVAIL 0x80 #define MPU_ACK 0xFE #define MPU_RESET 0xFF #define UART_MODE_ON 0x3F static int sb16midi_opened = 0; static int sb16midi_base = 0x330; static int sb16midi_detected = 0; static int my_dev; extern int sbc_base; static int reset_sb16midi (void); static void (*midi_input_intr) (int dev, unsigned char data); static void sb16midi_input_loop (void) { while (input_avail ()) { unsigned char c = sb16midi_read (); if (sb16midi_opened & OPEN_READ) midi_input_intr (my_dev, c); } } void sb16midiintr (int unit) { if (input_avail ()) sb16midi_input_loop (); } 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; 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_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 */ } #define MIDI_SYNTH_NAME "SoundBlaster 16 Midi" #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT #include "midi_synth.h" static struct midi_operations sb16midi_operations = { {"SoundBlaster 16 Midi", 0, 0, SNDCARD_SB16MIDI}, &std_midi_synth, sb16midi_open, sb16midi_close, sb16midi_ioctl, sb16midi_out, sb16midi_start_read, sb16midi_end_read, sb16midi_kick, NULL, sb16midi_buffer_status, NULL }; 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); if (num_midis >= MAX_MIDI_DEV) { printk ("Sound: Too many midi devices detected\n"); return mem_start; } #ifdef __FreeBSD__ printk ("sbmidi: "); #else printk (" "); #endif std_midi_synth.midi_dev = 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; extern int sbc_major; if (sbc_major < 4) return 0; /* Not a SB16 */ sb16midi_base = hw_config->io_base; if (sb_get_irq () < 0) return 0; ok = reset_sb16midi (); sb16midi_detected = ok; return ok; } #endif #endif