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(card: vortex->card, device: 0, MPU401_HW_AUREAL, port,
82 MPU401_INFO_INTEGRATED | MPU401_INFO_MMIO |
83 MPU401_INFO_IRQ_HOOK, irq: -1, rrawmidi: &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(buf: rmidi->name, size: sizeof(rmidi->name), fmt: "%s MIDI %d", CARD_NAME_SHORT , vortex->card->number);
95
96 vortex->rmidi = rmidi;
97 return 0;
98}
99

source code of linux/sound/pci/au88x0/au88x0_mpu401.c