sound/pci/au88x0/au88x0_mpu401.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/time.h>
  25 #include <linux/init.h>
  26 #include <sound/core.h>
  27 #include <sound/mpu401.h>
  28 #include "au88x0.h"
  29
  30 /* Check for mpu401 mmio support. */
  31 /* MPU401 legacy support is only provided as a emergency fallback *
  32  * for older versions of ALSA. Its usage is strongly discouraged. */
  33 #ifndef MPU401_HW_AUREAL
  34 #define VORTEX_MPU401_LEGACY
  35 #endif
  36
  37 /* Vortex MPU401 defines. */
  38 #define MIDI_CLOCK_DIV      0x61
  39 /* Standart MPU401 defines. */
  40 #define MPU401_RESET            0xff
  41 #define MPU401_ENTER_UART       0x3f
  42 #define MPU401_ACK                  0xfe
  43
  44 static int snd_vortex_midi(vortex_t *vortex)
  45 {
  46         struct snd_rawmidi *rmidi;
  47         int temp, mode;
  48         struct snd_mpu401 *mpu;
  49         unsigned long port;
  50
  51 #ifdef VORTEX_MPU401_LEGACY
  52         /* EnableHardCodedMPU401Port() */
  53         /* Enable Legacy MIDI Interface port. */
  54         port = (0x03 << 5);     /* FIXME: static address. 0x330 */
  55         temp =
  56             (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) |
  57             CTRL_MIDI_EN | port;
  58         hwwrite(vortex->mmio, VORTEX_CTRL, temp);
  59 #else
  60         /* Disable Legacy MIDI Interface port. */
  61         temp =
  62             (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) &
  63             ~CTRL_MIDI_EN;
  64         hwwrite(vortex->mmio, VORTEX_CTRL, temp);
  65 #endif
  66         /* Mpu401UartInit() */
  67         mode = 1;
  68         temp = hwread(vortex->mmio, VORTEX_CTRL2) & 0xffff00cf;
  69         temp |= (MIDI_CLOCK_DIV << 8) | ((mode >> 24) & 0xff) << 4;
  70         hwwrite(vortex->mmio, VORTEX_CTRL2, temp);
  71         hwwrite(vortex->mmio, VORTEX_MIDI_CMD, MPU401_RESET);
  72
  73         /* Check if anything is OK. */
  74         temp = hwread(vortex->mmio, VORTEX_MIDI_DATA);
  75         if (temp != MPU401_ACK /*0xfe */ ) {
  76                 printk(KERN_ERR "midi port doesn't acknowledge!\n");
  77                 return -ENODEV;
  78         }
  79         /* Enable MPU401 interrupts. */
  80         hwwrite(vortex->mmio, VORTEX_IRQ_CTRL,
  81                 hwread(vortex->mmio, VORTEX_IRQ_CTRL) | IRQ_MIDI);
  82
  83         /* Create MPU401 instance. */
  84 #ifdef VORTEX_MPU401_LEGACY
  85         if ((temp =
  86              snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_MPU401, 0x330,
  87                                  MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
  88                 hwwrite(vortex->mmio, VORTEX_CTRL,
  89                         (hwread(vortex->mmio, VORTEX_CTRL) &
  90                          ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
  91                 return temp;
  92         }
  93 #else
  94         port = (unsigned long)(vortex->mmio + VORTEX_MIDI_DATA);
  95         if ((temp =
  96              snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_AUREAL, port,
  97                                  MPU401_INFO_INTEGRATED | MPU401_INFO_MMIO |
  98                                  MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
  99                 hwwrite(vortex->mmio, VORTEX_CTRL,
 100                         (hwread(vortex->mmio, VORTEX_CTRL) &
 101                          ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
 102                 return temp;
 103         }
 104         mpu = rmidi->private_data;
 105         mpu->cport = (unsigned long)(vortex->mmio + VORTEX_MIDI_CMD);
 106 #endif
 107         /* Overwrite MIDI name */
 108         snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI %d", CARD_NAME_SHORT , vortex->card->number);
 109
 110         vortex->rmidi = rmidi;
 111         return 0;
 112 }