sound/pci/au88x0/au88x0_mpu401.c

   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
  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 }