au88x0_mpu401.c

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/*
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 *  Routines for control of MPU-401 in UART mode
 *
 *   Modified for the Aureal Vortex based Soundcards
 *   by Manuel Jander ([email protected]).
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/time.h>
#include <linux/init.h>
#include <sound/core.h>
#include <sound/mpu401.h>
#include "au88x0.h"

/* Check for mpu401 mmio support. */
/* MPU401 legacy support is only provided as a emergency fallback *
 * for older versions of ALSA. Its usage is strongly discouraged. */
#ifndef MPU401_HW_AUREAL
#define VORTEX_MPU401_LEGACY
#endif

/* Vortex MPU401 defines. */
#define MIDI_CLOCK_DIV      0x61
/* Standart MPU401 defines. */
#define MPU401_RESET        0xff
#define MPU401_ENTER_UART   0x3f
#define MPU401_ACK          0xfe

static int __devinit snd_vortex_midi(vortex_t * vortex)
{
    struct snd_rawmidi *rmidi;
    int temp, mode;
    struct snd_mpu401 *mpu;
    unsigned long port;

#ifdef VORTEX_MPU401_LEGACY
    /* EnableHardCodedMPU401Port() */
    /* Enable Legacy MIDI Interface port. */
    port = (0x03 << 5); /* FIXME: static address. 0x330 */
    temp =
        (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) |
        CTRL_MIDI_EN | port;
    hwwrite(vortex->mmio, VORTEX_CTRL, temp);
#else
    /* Disable Legacy MIDI Interface port. */
    temp =
        (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) &
        ~CTRL_MIDI_EN;
    hwwrite(vortex->mmio, VORTEX_CTRL, temp);
#endif
    /* Mpu401UartInit() */
    mode = 1;
    temp = hwread(vortex->mmio, VORTEX_CTRL2) & 0xffff00cf;
    temp |= (MIDI_CLOCK_DIV << 8) | ((mode >> 24) & 0xff) << 4;
    hwwrite(vortex->mmio, VORTEX_CTRL2, temp);
    hwwrite(vortex->mmio, VORTEX_MIDI_CMD, MPU401_RESET);

    /* Check if anything is OK. */
    temp = hwread(vortex->mmio, VORTEX_MIDI_DATA);
    if (temp != MPU401_ACK /*0xfe */ ) {
        printk(KERN_ERR "midi port doesn't acknowledge!\n");
        return -ENODEV;
    }
    /* Enable MPU401 interrupts. */
    hwwrite(vortex->mmio, VORTEX_IRQ_CTRL,
        hwread(vortex->mmio, VORTEX_IRQ_CTRL) | IRQ_MIDI);

    /* Create MPU401 instance. */
#ifdef VORTEX_MPU401_LEGACY
    if ((temp =
         snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_MPU401, 0x330,
                 MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
        hwwrite(vortex->mmio, VORTEX_CTRL,
            (hwread(vortex->mmio, VORTEX_CTRL) &
             ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
        return temp;
    }
#else
    port = (unsigned long)(vortex->mmio + VORTEX_MIDI_DATA);
    if ((temp =
         snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_AUREAL, port,
                 MPU401_INFO_INTEGRATED | MPU401_INFO_MMIO |
                 MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
        hwwrite(vortex->mmio, VORTEX_CTRL,
            (hwread(vortex->mmio, VORTEX_CTRL) &
             ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
        return temp;
    }
    mpu = rmidi->private_data;
    mpu->cport = (unsigned long)(vortex->mmio + VORTEX_MIDI_CMD);
#endif
    /* Overwrite MIDI name */
    snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI %d", CARD_NAME_SHORT , vortex->card->number);

    vortex->rmidi = rmidi;
    return 0;
}