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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/pci/au88x0/au88x0_mpu401.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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 *  Copyright (c) by Jaroslav Kysela <[email protected]>

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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 ([email protected]).

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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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