362 lines
7.1 KiB
C
362 lines
7.1 KiB
C
/*
|
|
* sound/oss/uart6850.c
|
|
*
|
|
*
|
|
* Copyright (C) by Hannu Savolainen 1993-1997
|
|
*
|
|
* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
|
|
* Version 2 (June 1991). See the "COPYING" file distributed with this software
|
|
* for more info.
|
|
* Extended by Alan Cox for Red Hat Software. Now a loadable MIDI driver.
|
|
* 28/4/97 - (C) Copyright Alan Cox. Released under the GPL version 2.
|
|
*
|
|
* Alan Cox: Updated for new modular code. Removed snd_* irq handling. Now
|
|
* uses native linux resources
|
|
* Christoph Hellwig: Adapted to module_init/module_exit
|
|
* Jeff Garzik: Made it work again, in theory
|
|
* FIXME: If the request_irq() succeeds, the probe succeeds. Ug.
|
|
*
|
|
* Status: Testing required (no shit -jgarzik)
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/spinlock.h>
|
|
/* Mon Nov 22 22:38:35 MET 1993 marco@driq.home.usn.nl:
|
|
* added 6850 support, used with COVOX SoundMaster II and custom cards.
|
|
*/
|
|
|
|
#include "sound_config.h"
|
|
|
|
static int uart6850_base = 0x330;
|
|
|
|
static int *uart6850_osp;
|
|
|
|
#define DATAPORT (uart6850_base)
|
|
#define COMDPORT (uart6850_base+1)
|
|
#define STATPORT (uart6850_base+1)
|
|
|
|
static int uart6850_status(void)
|
|
{
|
|
return inb(STATPORT);
|
|
}
|
|
|
|
#define input_avail() (uart6850_status()&INPUT_AVAIL)
|
|
#define output_ready() (uart6850_status()&OUTPUT_READY)
|
|
|
|
static void uart6850_cmd(unsigned char cmd)
|
|
{
|
|
outb(cmd, COMDPORT);
|
|
}
|
|
|
|
static int uart6850_read(void)
|
|
{
|
|
return inb(DATAPORT);
|
|
}
|
|
|
|
static void uart6850_write(unsigned char byte)
|
|
{
|
|
outb(byte, DATAPORT);
|
|
}
|
|
|
|
#define OUTPUT_READY 0x02 /* Mask for data ready Bit */
|
|
#define INPUT_AVAIL 0x01 /* Mask for Data Send Ready Bit */
|
|
|
|
#define UART_RESET 0x95
|
|
#define UART_MODE_ON 0x03
|
|
|
|
static int uart6850_opened;
|
|
static int uart6850_irq;
|
|
static int uart6850_detected;
|
|
static int my_dev;
|
|
static DEFINE_SPINLOCK(lock);
|
|
|
|
static void (*midi_input_intr) (int dev, unsigned char data);
|
|
static void poll_uart6850(unsigned long dummy);
|
|
|
|
|
|
static DEFINE_TIMER(uart6850_timer, poll_uart6850, 0, 0);
|
|
|
|
static void uart6850_input_loop(void)
|
|
{
|
|
int count = 10;
|
|
|
|
while (count)
|
|
{
|
|
/*
|
|
* Not timed out
|
|
*/
|
|
if (input_avail())
|
|
{
|
|
unsigned char c = uart6850_read();
|
|
count = 100;
|
|
if (uart6850_opened & OPEN_READ)
|
|
midi_input_intr(my_dev, c);
|
|
}
|
|
else
|
|
{
|
|
while (!input_avail() && count)
|
|
count--;
|
|
}
|
|
}
|
|
}
|
|
|
|
static irqreturn_t m6850intr(int irq, void *dev_id)
|
|
{
|
|
if (input_avail())
|
|
uart6850_input_loop();
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* It looks like there is no input interrupts in the UART mode. Let's try
|
|
* polling.
|
|
*/
|
|
|
|
static void poll_uart6850(unsigned long dummy)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!(uart6850_opened & OPEN_READ))
|
|
return; /* Device has been closed */
|
|
|
|
spin_lock_irqsave(&lock,flags);
|
|
if (input_avail())
|
|
uart6850_input_loop();
|
|
|
|
uart6850_timer.expires = 1 + jiffies;
|
|
add_timer(&uart6850_timer);
|
|
|
|
/*
|
|
* Come back later
|
|
*/
|
|
|
|
spin_unlock_irqrestore(&lock,flags);
|
|
}
|
|
|
|
static int uart6850_open(int dev, int mode,
|
|
void (*input) (int dev, unsigned char data),
|
|
void (*output) (int dev)
|
|
)
|
|
{
|
|
if (uart6850_opened)
|
|
{
|
|
/* printk("Midi6850: Midi busy\n");*/
|
|
return -EBUSY;
|
|
}
|
|
|
|
uart6850_cmd(UART_RESET);
|
|
uart6850_input_loop();
|
|
midi_input_intr = input;
|
|
uart6850_opened = mode;
|
|
poll_uart6850(0); /*
|
|
* Enable input polling
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void uart6850_close(int dev)
|
|
{
|
|
uart6850_cmd(UART_MODE_ON);
|
|
del_timer(&uart6850_timer);
|
|
uart6850_opened = 0;
|
|
}
|
|
|
|
static int uart6850_out(int dev, unsigned char midi_byte)
|
|
{
|
|
int timeout;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* Test for input since pending input seems to block the output.
|
|
*/
|
|
|
|
spin_lock_irqsave(&lock,flags);
|
|
|
|
if (input_avail())
|
|
uart6850_input_loop();
|
|
|
|
spin_unlock_irqrestore(&lock,flags);
|
|
|
|
/*
|
|
* Sometimes it takes about 13000 loops before the output becomes ready
|
|
* (After reset). Normally it takes just about 10 loops.
|
|
*/
|
|
|
|
for (timeout = 30000; timeout > 0 && !output_ready(); timeout--); /*
|
|
* Wait
|
|
*/
|
|
if (!output_ready())
|
|
{
|
|
printk(KERN_WARNING "Midi6850: Timeout\n");
|
|
return 0;
|
|
}
|
|
uart6850_write(midi_byte);
|
|
return 1;
|
|
}
|
|
|
|
static inline int uart6850_command(int dev, unsigned char *midi_byte)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline int uart6850_start_read(int dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int uart6850_end_read(int dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void uart6850_kick(int dev)
|
|
{
|
|
}
|
|
|
|
static inline int uart6850_buffer_status(int dev)
|
|
{
|
|
return 0; /*
|
|
* No data in buffers
|
|
*/
|
|
}
|
|
|
|
#define MIDI_SYNTH_NAME "6850 UART Midi"
|
|
#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
|
|
#include "midi_synth.h"
|
|
|
|
static struct midi_operations uart6850_operations =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.info = {"6850 UART", 0, 0, SNDCARD_UART6850},
|
|
.converter = &std_midi_synth,
|
|
.in_info = {0},
|
|
.open = uart6850_open,
|
|
.close = uart6850_close,
|
|
.outputc = uart6850_out,
|
|
.start_read = uart6850_start_read,
|
|
.end_read = uart6850_end_read,
|
|
.kick = uart6850_kick,
|
|
.command = uart6850_command,
|
|
.buffer_status = uart6850_buffer_status
|
|
};
|
|
|
|
|
|
static void __init attach_uart6850(struct address_info *hw_config)
|
|
{
|
|
int ok, timeout;
|
|
unsigned long flags;
|
|
|
|
if (!uart6850_detected)
|
|
return;
|
|
|
|
if ((my_dev = sound_alloc_mididev()) == -1)
|
|
{
|
|
printk(KERN_INFO "uart6850: Too many midi devices detected\n");
|
|
return;
|
|
}
|
|
uart6850_base = hw_config->io_base;
|
|
uart6850_osp = hw_config->osp;
|
|
uart6850_irq = hw_config->irq;
|
|
|
|
spin_lock_irqsave(&lock,flags);
|
|
|
|
for (timeout = 30000; timeout > 0 && !output_ready(); timeout--); /*
|
|
* Wait
|
|
*/
|
|
uart6850_cmd(UART_MODE_ON);
|
|
ok = 1;
|
|
spin_unlock_irqrestore(&lock,flags);
|
|
|
|
conf_printf("6850 Midi Interface", hw_config);
|
|
|
|
std_midi_synth.midi_dev = my_dev;
|
|
hw_config->slots[4] = my_dev;
|
|
midi_devs[my_dev] = &uart6850_operations;
|
|
sequencer_init();
|
|
}
|
|
|
|
static inline int reset_uart6850(void)
|
|
{
|
|
uart6850_read();
|
|
return 1; /*
|
|
* OK
|
|
*/
|
|
}
|
|
|
|
static int __init probe_uart6850(struct address_info *hw_config)
|
|
{
|
|
int ok;
|
|
|
|
uart6850_osp = hw_config->osp;
|
|
uart6850_base = hw_config->io_base;
|
|
uart6850_irq = hw_config->irq;
|
|
|
|
if (request_irq(uart6850_irq, m6850intr, 0, "MIDI6850", NULL) < 0)
|
|
return 0;
|
|
|
|
ok = reset_uart6850();
|
|
uart6850_detected = ok;
|
|
return ok;
|
|
}
|
|
|
|
static void __exit unload_uart6850(struct address_info *hw_config)
|
|
{
|
|
free_irq(hw_config->irq, NULL);
|
|
sound_unload_mididev(hw_config->slots[4]);
|
|
}
|
|
|
|
static struct address_info cfg_mpu;
|
|
|
|
static int __initdata io = -1;
|
|
static int __initdata irq = -1;
|
|
|
|
module_param(io, int, 0);
|
|
module_param(irq, int, 0);
|
|
|
|
static int __init init_uart6850(void)
|
|
{
|
|
cfg_mpu.io_base = io;
|
|
cfg_mpu.irq = irq;
|
|
|
|
if (cfg_mpu.io_base == -1 || cfg_mpu.irq == -1) {
|
|
printk(KERN_INFO "uart6850: irq and io must be set.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (probe_uart6850(&cfg_mpu))
|
|
return -ENODEV;
|
|
attach_uart6850(&cfg_mpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit cleanup_uart6850(void)
|
|
{
|
|
unload_uart6850(&cfg_mpu);
|
|
}
|
|
|
|
module_init(init_uart6850);
|
|
module_exit(cleanup_uart6850);
|
|
|
|
#ifndef MODULE
|
|
static int __init setup_uart6850(char *str)
|
|
{
|
|
/* io, irq */
|
|
int ints[3];
|
|
|
|
str = get_options(str, ARRAY_SIZE(ints), ints);
|
|
|
|
io = ints[1];
|
|
irq = ints[2];
|
|
|
|
return 1;
|
|
}
|
|
__setup("uart6850=", setup_uart6850);
|
|
#endif
|
|
MODULE_LICENSE("GPL");
|