dba8b46992
The semantics of snd_mpu401_uart_new()'s interrupt parameters are somewhat counterintuitive: To prevent the function from allocating its own interrupt, either the irq number must be invalid, or the irq_flags parameter must be zero. At the same time, the irq parameter being invalid specifies that the mpu401 code has to work without an interrupt allocated by the caller. This implies that, if there is an interrupt and it is allocated by the caller, the irq parameter must be set to a valid-looking number which then isn't actually used. With the removal of IRQF_DISABLED, zero becomes a valid irq_flags value, which forces us to handle the parameters differently. This patch introduces a new flag MPU401_INFO_IRQ_HOOK for when the device interrupt is handled by the caller, and makes the allocation of the interrupt to depend only on the irq parameter. As suggested by Takashi, the irq_flags parameter was dropped because, when used, it had the constant value IRQF_DISABLED. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Routines for control of MPU-401 in UART mode
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*
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* Modified for the Aureal Vortex based Soundcards
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* by Manuel Jander (mjande@embedded.cl).
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/time.h>
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#include <linux/init.h>
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#include <sound/core.h>
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#include <sound/mpu401.h>
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#include "au88x0.h"
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/* Check for mpu401 mmio support. */
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/* MPU401 legacy support is only provided as a emergency fallback *
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* for older versions of ALSA. Its usage is strongly discouraged. */
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#ifndef MPU401_HW_AUREAL
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#define VORTEX_MPU401_LEGACY
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#endif
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/* Vortex MPU401 defines. */
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#define MIDI_CLOCK_DIV 0x61
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/* Standart MPU401 defines. */
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#define MPU401_RESET 0xff
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#define MPU401_ENTER_UART 0x3f
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#define MPU401_ACK 0xfe
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static int __devinit snd_vortex_midi(vortex_t * vortex)
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{
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struct snd_rawmidi *rmidi;
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int temp, mode;
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struct snd_mpu401 *mpu;
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unsigned long port;
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#ifdef VORTEX_MPU401_LEGACY
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/* EnableHardCodedMPU401Port() */
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/* Enable Legacy MIDI Interface port. */
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port = (0x03 << 5); /* FIXME: static address. 0x330 */
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temp =
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(hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) |
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CTRL_MIDI_EN | port;
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hwwrite(vortex->mmio, VORTEX_CTRL, temp);
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#else
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/* Disable Legacy MIDI Interface port. */
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temp =
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(hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) &
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~CTRL_MIDI_EN;
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hwwrite(vortex->mmio, VORTEX_CTRL, temp);
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#endif
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/* Mpu401UartInit() */
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mode = 1;
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temp = hwread(vortex->mmio, VORTEX_CTRL2) & 0xffff00cf;
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temp |= (MIDI_CLOCK_DIV << 8) | ((mode >> 24) & 0xff) << 4;
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hwwrite(vortex->mmio, VORTEX_CTRL2, temp);
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hwwrite(vortex->mmio, VORTEX_MIDI_CMD, MPU401_RESET);
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/* Check if anything is OK. */
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temp = hwread(vortex->mmio, VORTEX_MIDI_DATA);
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if (temp != MPU401_ACK /*0xfe */ ) {
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printk(KERN_ERR "midi port doesn't acknowledge!\n");
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return -ENODEV;
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}
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/* Enable MPU401 interrupts. */
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hwwrite(vortex->mmio, VORTEX_IRQ_CTRL,
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hwread(vortex->mmio, VORTEX_IRQ_CTRL) | IRQ_MIDI);
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/* Create MPU401 instance. */
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#ifdef VORTEX_MPU401_LEGACY
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if ((temp =
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snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_MPU401, 0x330,
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MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
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hwwrite(vortex->mmio, VORTEX_CTRL,
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(hwread(vortex->mmio, VORTEX_CTRL) &
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~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
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return temp;
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}
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#else
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port = (unsigned long)(vortex->mmio + VORTEX_MIDI_DATA);
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if ((temp =
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snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_AUREAL, port,
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MPU401_INFO_INTEGRATED | MPU401_INFO_MMIO |
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MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
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hwwrite(vortex->mmio, VORTEX_CTRL,
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(hwread(vortex->mmio, VORTEX_CTRL) &
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~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
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return temp;
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}
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mpu = rmidi->private_data;
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mpu->cport = (unsigned long)(vortex->mmio + VORTEX_MIDI_CMD);
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#endif
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/* Overwrite MIDI name */
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snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI %d", CARD_NAME_SHORT , vortex->card->number);
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vortex->rmidi = rmidi;
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return 0;
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}
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