xref: /openbmc/linux/sound/pci/au88x0/au88x0_mpu401.c (revision c2b0718f)
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 	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