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