605 lines
16 KiB
C
605 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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* MPU-401 supports UART mode which is not capable generate transmit
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* interrupts thus output is done via polling. Without interrupt,
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* input is done also via polling. Do not expect good performance.
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*
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* 13-03-2003:
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* Added support for different kind of hardware I/O. Build in choices
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* are port and mmio. For other kind of I/O, set mpu->read and
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* mpu->write to your own I/O functions.
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*/
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/errno.h>
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#include <sound/core.h>
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#include <sound/mpu401.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
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MODULE_LICENSE("GPL");
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static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
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static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
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/*
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*/
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#define snd_mpu401_input_avail(mpu) \
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(!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY))
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#define snd_mpu401_output_ready(mpu) \
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(!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL))
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/* Build in lowlevel io */
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static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
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unsigned long addr)
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{
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outb(data, addr);
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}
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static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
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unsigned long addr)
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{
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return inb(addr);
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}
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static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
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unsigned long addr)
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{
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writeb(data, (void __iomem *)addr);
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}
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static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
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unsigned long addr)
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{
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return readb((void __iomem *)addr);
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}
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/* */
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static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
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{
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int timeout = 100000;
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for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
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mpu->read(mpu, MPU401D(mpu));
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#ifdef CONFIG_SND_DEBUG
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if (timeout <= 0)
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snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
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mpu->read(mpu, MPU401C(mpu)));
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#endif
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}
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static void uart_interrupt_tx(struct snd_mpu401 *mpu)
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{
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unsigned long flags;
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if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
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test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
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spin_lock_irqsave(&mpu->output_lock, flags);
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snd_mpu401_uart_output_write(mpu);
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spin_unlock_irqrestore(&mpu->output_lock, flags);
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}
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}
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static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
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{
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unsigned long flags;
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if (mpu->info_flags & MPU401_INFO_INPUT) {
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spin_lock_irqsave(&mpu->input_lock, flags);
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if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
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snd_mpu401_uart_input_read(mpu);
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else
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snd_mpu401_uart_clear_rx(mpu);
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spin_unlock_irqrestore(&mpu->input_lock, flags);
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}
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if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
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/* ok. for better Tx performance try do some output
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when input is done */
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uart_interrupt_tx(mpu);
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}
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/**
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* snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
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* @irq: the irq number
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* @dev_id: mpu401 instance
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*
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* Processes the interrupt for MPU401-UART i/o.
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*
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* Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
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*/
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irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
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{
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struct snd_mpu401 *mpu = dev_id;
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if (!mpu)
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return IRQ_NONE;
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_snd_mpu401_uart_interrupt(mpu);
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return IRQ_HANDLED;
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}
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EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
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/**
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* snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
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* @irq: the irq number
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* @dev_id: mpu401 instance
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*
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* Processes the interrupt for MPU401-UART output.
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*
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* Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
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*/
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irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
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{
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struct snd_mpu401 *mpu = dev_id;
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if (!mpu)
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return IRQ_NONE;
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uart_interrupt_tx(mpu);
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return IRQ_HANDLED;
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}
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EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
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/*
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* timer callback
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* reprogram the timer and call the interrupt job
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*/
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static void snd_mpu401_uart_timer(struct timer_list *t)
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{
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struct snd_mpu401 *mpu = from_timer(mpu, t, timer);
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unsigned long flags;
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spin_lock_irqsave(&mpu->timer_lock, flags);
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/*mpu->mode |= MPU401_MODE_TIMER;*/
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mod_timer(&mpu->timer, 1 + jiffies);
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spin_unlock_irqrestore(&mpu->timer_lock, flags);
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if (mpu->rmidi)
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_snd_mpu401_uart_interrupt(mpu);
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}
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/*
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* initialize the timer callback if not programmed yet
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*/
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static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
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{
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unsigned long flags;
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spin_lock_irqsave (&mpu->timer_lock, flags);
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if (mpu->timer_invoked == 0) {
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timer_setup(&mpu->timer, snd_mpu401_uart_timer, 0);
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mod_timer(&mpu->timer, 1 + jiffies);
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}
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mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
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MPU401_MODE_OUTPUT_TIMER;
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spin_unlock_irqrestore (&mpu->timer_lock, flags);
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}
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/*
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* remove the timer callback if still active
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*/
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static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
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{
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unsigned long flags;
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spin_lock_irqsave (&mpu->timer_lock, flags);
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if (mpu->timer_invoked) {
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mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
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~MPU401_MODE_OUTPUT_TIMER;
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if (! mpu->timer_invoked)
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del_timer(&mpu->timer);
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}
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spin_unlock_irqrestore (&mpu->timer_lock, flags);
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}
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/*
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* send a UART command
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* return zero if successful, non-zero for some errors
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*/
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static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
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int ack)
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{
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unsigned long flags;
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int timeout, ok;
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spin_lock_irqsave(&mpu->input_lock, flags);
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if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
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mpu->write(mpu, 0x00, MPU401D(mpu));
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/*snd_mpu401_uart_clear_rx(mpu);*/
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}
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/* ok. standard MPU-401 initialization */
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if (mpu->hardware != MPU401_HW_SB) {
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for (timeout = 1000; timeout > 0 &&
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!snd_mpu401_output_ready(mpu); timeout--)
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udelay(10);
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#ifdef CONFIG_SND_DEBUG
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if (!timeout)
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snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
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mpu->read(mpu, MPU401C(mpu)));
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#endif
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}
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mpu->write(mpu, cmd, MPU401C(mpu));
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if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
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ok = 0;
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timeout = 10000;
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while (!ok && timeout-- > 0) {
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if (snd_mpu401_input_avail(mpu)) {
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if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
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ok = 1;
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}
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}
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if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
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ok = 1;
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} else
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ok = 1;
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spin_unlock_irqrestore(&mpu->input_lock, flags);
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if (!ok) {
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snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
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"(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
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mpu->read(mpu, MPU401C(mpu)),
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mpu->read(mpu, MPU401D(mpu)));
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return 1;
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}
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return 0;
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}
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static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
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{
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if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
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return -EIO;
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if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
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return -EIO;
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return 0;
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}
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/*
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* input/output open/close - protected by open_mutex in rawmidi.c
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*/
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static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
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{
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struct snd_mpu401 *mpu;
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int err;
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mpu = substream->rmidi->private_data;
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if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
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return err;
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if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
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if (snd_mpu401_do_reset(mpu) < 0)
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goto error_out;
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}
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mpu->substream_input = substream;
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set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
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return 0;
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error_out:
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if (mpu->open_input && mpu->close_input)
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mpu->close_input(mpu);
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return -EIO;
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}
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static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
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{
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struct snd_mpu401 *mpu;
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int err;
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mpu = substream->rmidi->private_data;
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if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
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return err;
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if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
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if (snd_mpu401_do_reset(mpu) < 0)
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goto error_out;
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}
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mpu->substream_output = substream;
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set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
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return 0;
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error_out:
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if (mpu->open_output && mpu->close_output)
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mpu->close_output(mpu);
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return -EIO;
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}
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static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
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{
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struct snd_mpu401 *mpu;
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int err = 0;
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mpu = substream->rmidi->private_data;
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clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
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mpu->substream_input = NULL;
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if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
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err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
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if (mpu->close_input)
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mpu->close_input(mpu);
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if (err)
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return -EIO;
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return 0;
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}
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static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
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{
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struct snd_mpu401 *mpu;
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int err = 0;
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mpu = substream->rmidi->private_data;
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clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
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mpu->substream_output = NULL;
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if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
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err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
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if (mpu->close_output)
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mpu->close_output(mpu);
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if (err)
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return -EIO;
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return 0;
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}
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/*
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* trigger input callback
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*/
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static void
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snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
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{
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unsigned long flags;
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struct snd_mpu401 *mpu;
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int max = 64;
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mpu = substream->rmidi->private_data;
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if (up) {
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if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
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&mpu->mode)) {
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/* first time - flush FIFO */
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while (max-- > 0)
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mpu->read(mpu, MPU401D(mpu));
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if (mpu->info_flags & MPU401_INFO_USE_TIMER)
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snd_mpu401_uart_add_timer(mpu, 1);
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}
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/* read data in advance */
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spin_lock_irqsave(&mpu->input_lock, flags);
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snd_mpu401_uart_input_read(mpu);
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spin_unlock_irqrestore(&mpu->input_lock, flags);
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} else {
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if (mpu->info_flags & MPU401_INFO_USE_TIMER)
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snd_mpu401_uart_remove_timer(mpu, 1);
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clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
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}
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}
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/*
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* transfer input pending data
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* call with input_lock spinlock held
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*/
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static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
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{
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int max = 128;
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unsigned char byte;
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while (max-- > 0) {
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if (! snd_mpu401_input_avail(mpu))
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break; /* input not available */
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byte = mpu->read(mpu, MPU401D(mpu));
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if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
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snd_rawmidi_receive(mpu->substream_input, &byte, 1);
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}
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}
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/*
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* Tx FIFO sizes:
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* CS4237B - 16 bytes
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* AudioDrive ES1688 - 12 bytes
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* S3 SonicVibes - 8 bytes
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* SoundBlaster AWE 64 - 2 bytes (ugly hardware)
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*/
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/*
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* write output pending bytes
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* call with output_lock spinlock held
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*/
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static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
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{
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unsigned char byte;
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int max = 256;
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do {
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if (snd_rawmidi_transmit_peek(mpu->substream_output,
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&byte, 1) == 1) {
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/*
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* Try twice because there is hardware that insists on
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* setting the output busy bit after each write.
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*/
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if (!snd_mpu401_output_ready(mpu) &&
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!snd_mpu401_output_ready(mpu))
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break; /* Tx FIFO full - try again later */
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mpu->write(mpu, byte, MPU401D(mpu));
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snd_rawmidi_transmit_ack(mpu->substream_output, 1);
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} else {
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snd_mpu401_uart_remove_timer (mpu, 0);
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break; /* no other data - leave the tx loop */
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}
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} while (--max > 0);
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}
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/*
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* output trigger callback
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*/
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static void
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snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
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{
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unsigned long flags;
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struct snd_mpu401 *mpu;
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mpu = substream->rmidi->private_data;
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if (up) {
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set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
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/* try to add the timer at each output trigger,
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* since the output timer might have been removed in
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* snd_mpu401_uart_output_write().
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*/
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if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
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snd_mpu401_uart_add_timer(mpu, 0);
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/* output pending data */
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spin_lock_irqsave(&mpu->output_lock, flags);
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snd_mpu401_uart_output_write(mpu);
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spin_unlock_irqrestore(&mpu->output_lock, flags);
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} else {
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if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
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snd_mpu401_uart_remove_timer(mpu, 0);
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clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
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}
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}
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/*
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*/
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static const struct snd_rawmidi_ops snd_mpu401_uart_output =
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{
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.open = snd_mpu401_uart_output_open,
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.close = snd_mpu401_uart_output_close,
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.trigger = snd_mpu401_uart_output_trigger,
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};
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static const struct snd_rawmidi_ops snd_mpu401_uart_input =
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{
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.open = snd_mpu401_uart_input_open,
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.close = snd_mpu401_uart_input_close,
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.trigger = snd_mpu401_uart_input_trigger,
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};
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static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
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{
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struct snd_mpu401 *mpu = rmidi->private_data;
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if (mpu->irq >= 0)
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free_irq(mpu->irq, (void *) mpu);
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release_and_free_resource(mpu->res);
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kfree(mpu);
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}
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/**
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* snd_mpu401_uart_new - create an MPU401-UART instance
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* @card: the card instance
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* @device: the device index, zero-based
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* @hardware: the hardware type, MPU401_HW_XXXX
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* @port: the base address of MPU401 port
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|
* @info_flags: bitflags MPU401_INFO_XXX
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* @irq: the ISA irq number, -1 if not to be allocated
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* @rrawmidi: the pointer to store the new rawmidi instance
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*
|
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* Creates a new MPU-401 instance.
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|
*
|
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* Note that the rawmidi instance is returned on the rrawmidi argument,
|
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* not the mpu401 instance itself. To access to the mpu401 instance,
|
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* cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
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*
|
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* Return: Zero if successful, or a negative error code.
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*/
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|
int snd_mpu401_uart_new(struct snd_card *card, int device,
|
|
unsigned short hardware,
|
|
unsigned long port,
|
|
unsigned int info_flags,
|
|
int irq,
|
|
struct snd_rawmidi ** rrawmidi)
|
|
{
|
|
struct snd_mpu401 *mpu;
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|
struct snd_rawmidi *rmidi;
|
|
int in_enable, out_enable;
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|
int err;
|
|
|
|
if (rrawmidi)
|
|
*rrawmidi = NULL;
|
|
if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
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|
info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
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|
in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
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|
out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
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|
if ((err = snd_rawmidi_new(card, "MPU-401U", device,
|
|
out_enable, in_enable, &rmidi)) < 0)
|
|
return err;
|
|
mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
|
|
if (!mpu) {
|
|
err = -ENOMEM;
|
|
goto free_device;
|
|
}
|
|
rmidi->private_data = mpu;
|
|
rmidi->private_free = snd_mpu401_uart_free;
|
|
spin_lock_init(&mpu->input_lock);
|
|
spin_lock_init(&mpu->output_lock);
|
|
spin_lock_init(&mpu->timer_lock);
|
|
mpu->hardware = hardware;
|
|
mpu->irq = -1;
|
|
if (! (info_flags & MPU401_INFO_INTEGRATED)) {
|
|
int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
|
|
mpu->res = request_region(port, res_size, "MPU401 UART");
|
|
if (!mpu->res) {
|
|
snd_printk(KERN_ERR "mpu401_uart: "
|
|
"unable to grab port 0x%lx size %d\n",
|
|
port, res_size);
|
|
err = -EBUSY;
|
|
goto free_device;
|
|
}
|
|
}
|
|
if (info_flags & MPU401_INFO_MMIO) {
|
|
mpu->write = mpu401_write_mmio;
|
|
mpu->read = mpu401_read_mmio;
|
|
} else {
|
|
mpu->write = mpu401_write_port;
|
|
mpu->read = mpu401_read_port;
|
|
}
|
|
mpu->port = port;
|
|
if (hardware == MPU401_HW_PC98II)
|
|
mpu->cport = port + 2;
|
|
else
|
|
mpu->cport = port + 1;
|
|
if (irq >= 0) {
|
|
if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
|
|
"MPU401 UART", (void *) mpu)) {
|
|
snd_printk(KERN_ERR "mpu401_uart: "
|
|
"unable to grab IRQ %d\n", irq);
|
|
err = -EBUSY;
|
|
goto free_device;
|
|
}
|
|
}
|
|
if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
|
|
info_flags |= MPU401_INFO_USE_TIMER;
|
|
mpu->info_flags = info_flags;
|
|
mpu->irq = irq;
|
|
if (card->shortname[0])
|
|
snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
|
|
card->shortname);
|
|
else
|
|
sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
|
|
if (out_enable) {
|
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
|
|
&snd_mpu401_uart_output);
|
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
|
|
}
|
|
if (in_enable) {
|
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
|
|
&snd_mpu401_uart_input);
|
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
|
|
if (out_enable)
|
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
|
|
}
|
|
mpu->rmidi = rmidi;
|
|
if (rrawmidi)
|
|
*rrawmidi = rmidi;
|
|
return 0;
|
|
free_device:
|
|
snd_device_free(card, rmidi);
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_mpu401_uart_new);
|