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}
99