sound/pci/au88x0/au88x0_mpu401.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   3  *  Routines for control of MPU-401 in UART mode
   4  *
   5  *   Modified for the Aureal Vortex based Soundcards
   6  *   by Manuel Jander (mjande@embedded.cl).
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  *
  22  */
  23
  24 #include <sound/driver.h>
  25 #include <linux/time.h>
  26 #include <linux/init.h>
  27 #include <sound/core.h>
  28 #include <sound/mpu401.h>
  29 #include "au88x0.h"
  30
  31 /* Check for mpu401 mmio support. */
  32 /* MPU401 legacy support is only provided as a emergency fallback *
  33  * for older versions of ALSA. Its usage is strongly discouraged. */
  34 #ifndef MPU401_HW_AUREAL
  35 #define VORTEX_MPU401_LEGACY
  36 #endif
  37
  38 /* Vortex MPU401 defines. */
  39 #define MIDI_CLOCK_DIV      0x61
  40 /* Standart MPU401 defines. */
  41 #define MPU401_RESET            0xff
  42 #define MPU401_ENTER_UART       0x3f
  43 #define MPU401_ACK                  0xfe
  44
  45 static int __devinit snd_vortex_midi(vortex_t * vortex)
  46 {
  47         struct snd_rawmidi *rmidi;
  48         int temp, mode;
  49         struct snd_mpu401 *mpu;
  50         int port;
  51
  52 #ifdef VORTEX_MPU401_LEGACY
  53         /* EnableHardCodedMPU401Port() */
  54         /* Enable Legacy MIDI Interface port. */
  55         port = (0x03 << 5);     /* FIXME: static address. 0x330 */
  56         temp =
  57             (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) |
  58             CTRL_MIDI_EN | port;
  59         hwwrite(vortex->mmio, VORTEX_CTRL, temp);
  60 #else
  61         /* Disable Legacy MIDI Interface port. */
  62         temp =
  63             (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) &
  64             ~CTRL_MIDI_EN;
  65         hwwrite(vortex->mmio, VORTEX_CTRL, temp);
  66 #endif
  67         /* Mpu401UartInit() */
  68         mode = 1;
  69         temp = hwread(vortex->mmio, VORTEX_CTRL2) & 0xffff00cf;
  70         temp |= (MIDI_CLOCK_DIV << 8) | ((mode >> 24) & 0xff) << 4;
  71         hwwrite(vortex->mmio, VORTEX_CTRL2, temp);
  72         hwwrite(vortex->mmio, VORTEX_MIDI_CMD, MPU401_RESET);
  73         /* Set some kind of mode */
  74         if (mode)
  75                 hwwrite(vortex->mmio, VORTEX_MIDI_CMD, MPU401_ENTER_UART);
  76
  77         /* Check if anything is OK. */
  78         temp = hwread(vortex->mmio, VORTEX_MIDI_DATA);
  79         if (temp != MPU401_ACK /*0xfe */ ) {
  80                 printk(KERN_ERR "midi port doesn't acknowledge!\n");
  81                 return -ENODEV;
  82         }
  83         /* Enable MPU401 interrupts. */
  84         hwwrite(vortex->mmio, VORTEX_IRQ_CTRL,
  85                 hwread(vortex->mmio, VORTEX_IRQ_CTRL) | IRQ_MIDI);
  86
  87         /* Create MPU401 instance. */
  88 #ifdef VORTEX_MPU401_LEGACY
  89         if ((temp =
  90              snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_MPU401, 0x330,
  91                                  0, 0, 0, &rmidi)) != 0) {
  92                 hwwrite(vortex->mmio, VORTEX_CTRL,
  93                         (hwread(vortex->mmio, VORTEX_CTRL) &
  94                          ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
  95                 return temp;
  96         }
  97 #else
  98         port = (unsigned long)(vortex->mmio + (VORTEX_MIDI_DATA >> 2));
  99         if ((temp =
 100              snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_AUREAL, port,
 101                                  1, 0, 0, &rmidi)) != 0) {
 102                 hwwrite(vortex->mmio, VORTEX_CTRL,
 103                         (hwread(vortex->mmio, VORTEX_CTRL) &
 104                          ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
 105                 return temp;
 106         }
 107         mpu = rmidi->private_data;
 108         mpu->cport = (unsigned long)(vortex->mmio + (VORTEX_MIDI_CMD >> 2));
 109 #endif
 110         vortex->rmidi = rmidi;
 111         return 0;
 112 }