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
snd_vortex_midi(vortex_t * vortex)30 static 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 if ((temp =
72 snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_MPU401, 0x330,
73 MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
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 if ((temp =
82 snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_AUREAL, port,
83 MPU401_INFO_INTEGRATED | MPU401_INFO_MMIO |
84 MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
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
