cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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au88x0_mpu401.c (2956B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
      4 *  Routines for control of MPU-401 in UART mode
      5 *
      6 *   Modified for the Aureal Vortex based Soundcards
      7 *   by Manuel Jander (mjande@embedded.cl).
      8 */
      9
     10#include <linux/time.h>
     11#include <linux/init.h>
     12#include <sound/core.h>
     13#include <sound/mpu401.h>
     14#include "au88x0.h"
     15
     16/* Check for mpu401 mmio support. */
     17/* MPU401 legacy support is only provided as a emergency fallback *
     18 * for older versions of ALSA. Its usage is strongly discouraged. */
     19#ifndef MPU401_HW_AUREAL
     20#define VORTEX_MPU401_LEGACY
     21#endif
     22
     23/* Vortex MPU401 defines. */
     24#define MIDI_CLOCK_DIV      0x61
     25/* Standart MPU401 defines. */
     26#define MPU401_RESET		0xff
     27#define MPU401_ENTER_UART	0x3f
     28#define MPU401_ACK		    0xfe
     29
     30static int snd_vortex_midi(vortex_t *vortex)
     31{
     32	struct snd_rawmidi *rmidi;
     33	int temp, mode;
     34	struct snd_mpu401 *mpu;
     35	unsigned long port;
     36
     37#ifdef VORTEX_MPU401_LEGACY
     38	/* EnableHardCodedMPU401Port() */
     39	/* Enable Legacy MIDI Interface port. */
     40	port = (0x03 << 5);	/* FIXME: static address. 0x330 */
     41	temp =
     42	    (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) |
     43	    CTRL_MIDI_EN | port;
     44	hwwrite(vortex->mmio, VORTEX_CTRL, temp);
     45#else
     46	/* Disable Legacy MIDI Interface port. */
     47	temp =
     48	    (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) &
     49	    ~CTRL_MIDI_EN;
     50	hwwrite(vortex->mmio, VORTEX_CTRL, temp);
     51#endif
     52	/* Mpu401UartInit() */
     53	mode = 1;
     54	temp = hwread(vortex->mmio, VORTEX_CTRL2) & 0xffff00cf;
     55	temp |= (MIDI_CLOCK_DIV << 8) | ((mode >> 24) & 0xff) << 4;
     56	hwwrite(vortex->mmio, VORTEX_CTRL2, temp);
     57	hwwrite(vortex->mmio, VORTEX_MIDI_CMD, MPU401_RESET);
     58
     59	/* Check if anything is OK. */
     60	temp = hwread(vortex->mmio, VORTEX_MIDI_DATA);
     61	if (temp != MPU401_ACK /*0xfe */ ) {
     62		dev_err(vortex->card->dev, "midi port doesn't acknowledge!\n");
     63		return -ENODEV;
     64	}
     65	/* Enable MPU401 interrupts. */
     66	hwwrite(vortex->mmio, VORTEX_IRQ_CTRL,
     67		hwread(vortex->mmio, VORTEX_IRQ_CTRL) | IRQ_MIDI);
     68
     69	/* Create MPU401 instance. */
     70#ifdef VORTEX_MPU401_LEGACY
     71	temp = snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_MPU401, 0x330,
     72				   MPU401_INFO_IRQ_HOOK, -1, &rmidi);
     73	if (temp) {
     74		hwwrite(vortex->mmio, VORTEX_CTRL,
     75			(hwread(vortex->mmio, VORTEX_CTRL) &
     76			 ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
     77		return temp;
     78	}
     79#else
     80	port = (unsigned long)(vortex->mmio + VORTEX_MIDI_DATA);
     81	temp = snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_AUREAL, port,
     82				   MPU401_INFO_INTEGRATED | MPU401_INFO_MMIO |
     83				   MPU401_INFO_IRQ_HOOK, -1, &rmidi);
     84	if (temp) {
     85		hwwrite(vortex->mmio, VORTEX_CTRL,
     86			(hwread(vortex->mmio, VORTEX_CTRL) &
     87			 ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
     88		return temp;
     89	}
     90	mpu = rmidi->private_data;
     91	mpu->cport = (unsigned long)(vortex->mmio + VORTEX_MIDI_CMD);
     92#endif
     93	/* Overwrite MIDI name */
     94	snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI %d", CARD_NAME_SHORT , vortex->card->number);
     95
     96	vortex->rmidi = rmidi;
     97	return 0;
     98}