99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Routines for control of MPU-401 in UART mode
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*
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* Modified for the Aureal Vortex based Soundcards
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* by Manuel Jander (mjande@embedded.cl).
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*/
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#include <linux/time.h>
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#include <linux/init.h>
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#include <sound/core.h>
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#include <sound/mpu401.h>
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#include "au88x0.h"
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/* Check for mpu401 mmio support. */
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/* MPU401 legacy support is only provided as a emergency fallback *
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* for older versions of ALSA. Its usage is strongly discouraged. */
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#ifndef MPU401_HW_AUREAL
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#define VORTEX_MPU401_LEGACY
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#endif
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/* Vortex MPU401 defines. */
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#define MIDI_CLOCK_DIV 0x61
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/* Standart MPU401 defines. */
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#define MPU401_RESET 0xff
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#define MPU401_ENTER_UART 0x3f
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#define MPU401_ACK 0xfe
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static int snd_vortex_midi(vortex_t *vortex)
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{
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struct snd_rawmidi *rmidi;
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int temp, mode;
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struct snd_mpu401 *mpu;
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unsigned long port;
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#ifdef VORTEX_MPU401_LEGACY
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/* EnableHardCodedMPU401Port() */
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/* Enable Legacy MIDI Interface port. */
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port = (0x03 << 5); /* FIXME: static address. 0x330 */
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temp =
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(hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) |
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CTRL_MIDI_EN | port;
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hwwrite(vortex->mmio, VORTEX_CTRL, temp);
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#else
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/* Disable Legacy MIDI Interface port. */
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temp =
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(hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) &
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~CTRL_MIDI_EN;
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hwwrite(vortex->mmio, VORTEX_CTRL, temp);
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#endif
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/* Mpu401UartInit() */
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mode = 1;
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temp = hwread(vortex->mmio, VORTEX_CTRL2) & 0xffff00cf;
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temp |= (MIDI_CLOCK_DIV << 8) | ((mode >> 24) & 0xff) << 4;
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hwwrite(vortex->mmio, VORTEX_CTRL2, temp);
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hwwrite(vortex->mmio, VORTEX_MIDI_CMD, MPU401_RESET);
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/* Check if anything is OK. */
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temp = hwread(vortex->mmio, VORTEX_MIDI_DATA);
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if (temp != MPU401_ACK /*0xfe */ ) {
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dev_err(vortex->card->dev, "midi port doesn't acknowledge!\n");
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return -ENODEV;
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}
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/* Enable MPU401 interrupts. */
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hwwrite(vortex->mmio, VORTEX_IRQ_CTRL,
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hwread(vortex->mmio, VORTEX_IRQ_CTRL) | IRQ_MIDI);
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/* Create MPU401 instance. */
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#ifdef VORTEX_MPU401_LEGACY
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temp = snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_MPU401, 0x330,
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MPU401_INFO_IRQ_HOOK, -1, &rmidi);
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if (temp) {
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hwwrite(vortex->mmio, VORTEX_CTRL,
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(hwread(vortex->mmio, VORTEX_CTRL) &
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~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
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return temp;
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}
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#else
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port = (unsigned long)(vortex->mmio + VORTEX_MIDI_DATA);
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temp = snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_AUREAL, port,
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MPU401_INFO_INTEGRATED | MPU401_INFO_MMIO |
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MPU401_INFO_IRQ_HOOK, -1, &rmidi);
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if (temp) {
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hwwrite(vortex->mmio, VORTEX_CTRL,
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(hwread(vortex->mmio, VORTEX_CTRL) &
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~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
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return temp;
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}
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mpu = rmidi->private_data;
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mpu->cport = (unsigned long)(vortex->mmio + VORTEX_MIDI_CMD);
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#endif
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/* Overwrite MIDI name */
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snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI %d", CARD_NAME_SHORT , vortex->card->number);
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vortex->rmidi = rmidi;
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return 0;
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}
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