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/*

 * sound/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/module.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 void (*midi_input_intr) (int dev, unsigned char data);

static void poll_uart6850(unsigned long dummy);

static struct timer_list uart6850_timer = {

        function: poll_uart6850

};

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--;

                }

        }

}

void m6850intr(int irq, void *dev_id, struct pt_regs *dummy)

{

        if (input_avail())

                uart6850_input_loop();

}

/*

 *      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 */

        save_flags(flags);

        cli();

        if (input_avail())

                uart6850_input_loop();

        uart6850_timer.expires = 1 + jiffies;

        add_timer(&uart6850_timer);

        /*

         *      Come back later

         */

        restore_flags(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.

         */

        save_flags(flags);

        cli();

        if (input_avail())

                uart6850_input_loop();

        restore_flags(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;

        save_flags(flags);

        cli();

        for (timeout = 30000; timeout > 0 && !output_ready(); timeout--);        /*

                                                                                 * Wait

                                                                                 */

        uart6850_cmd(UART_MODE_ON);

        ok = 1;

        restore_flags(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_PARM(io,"i");

MODULE_PARM(irq,"i");

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");