/*
 * sound/oss/pas2_card.c
 *
 * Detection routine for the Pro Audio Spectrum cards.
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include "sound_config.h"

#include "pas2.h"
#include "sb.h"

static unsigned char dma_bits[] = {
        4, 1, 2, 3, 0, 5, 6, 7
};

static unsigned char irq_bits[] = {
        0, 0, 1, 2, 3, 4, 5, 6, 0, 1, 7, 8, 9, 0, 10, 11
};

static unsigned char sb_irq_bits[] = {
        0x00, 0x00, 0x08, 0x10, 0x00, 0x18, 0x00, 0x20, 
        0x00, 0x08, 0x28, 0x30, 0x38, 0, 0
};

static unsigned char sb_dma_bits[] = {
        0x00, 0x40, 0x80, 0xC0, 0, 0, 0, 0
};

/*
 * The Address Translation code is used to convert I/O register addresses to
 * be relative to the given base -register
 */

int             pas_translate_code = 0;
static int      pas_intr_mask;
static int      pas_irq;
static int      pas_sb_base;
DEFINE_SPINLOCK(pas_lock);
#ifndef CONFIG_PAS_JOYSTICK
static bool     joystick;
#else
static bool     joystick = 1;
#endif
#ifdef SYMPHONY_PAS
static bool     symphony = 1;
#else
static bool     symphony;
#endif
#ifdef BROKEN_BUS_CLOCK
static bool     broken_bus_clock = 1;
#else
static bool     broken_bus_clock;
#endif

static struct address_info cfg;
static struct address_info cfg2;

char            pas_model = 0;
static char    *pas_model_names[] = {
        "", 
        "Pro AudioSpectrum+", 
        "CDPC", 
        "Pro AudioSpectrum 16", 
        "Pro AudioSpectrum 16D"
};

/*
 * pas_read() and pas_write() are equivalents of inb and outb 
 * These routines perform the I/O address translation required
 * to support other than the default base address
 */

unsigned char pas_read(int ioaddr)
{
        return inb(ioaddr + pas_translate_code);
}

void pas_write(unsigned char data, int ioaddr)
{
        outb((data), ioaddr + pas_translate_code);
}

/******************* Begin of the Interrupt Handler ********************/

static irqreturn_t pasintr(int irq, void *dev_id)
{
        int             status;

        status = pas_read(0x0B89);
        pas_write(status, 0x0B89);      /* Clear interrupt */

        if (status & 0x08)
        {
                  pas_pcm_interrupt(status, 1);
                  status &= ~0x08;
        }
        if (status & 0x10)
        {
                  pas_midi_interrupt();
                  status &= ~0x10;
        }
        return IRQ_HANDLED;
}

int pas_set_intr(int mask)
{
        if (!mask)
                return 0;

        pas_intr_mask |= mask;

        pas_write(pas_intr_mask, 0x0B8B);
        return 0;
}

int pas_remove_intr(int mask)
{
        if (!mask)
                return 0;

        pas_intr_mask &= ~mask;
        pas_write(pas_intr_mask, 0x0B8B);

        return 0;
}

/******************* End of the Interrupt handler **********************/

/******************* Begin of the Initialization Code ******************/

static int __init config_pas_hw(struct address_info *hw_config)
{
        char            ok = 1;
        unsigned        int_ptrs;       /* scsi/sound interrupt pointers */

        pas_irq = hw_config->irq;

        pas_write(0x00, 0x0B8B);
        pas_write(0x36, 0x138B);
        pas_write(0x36, 0x1388);
        pas_write(0, 0x1388);
        pas_write(0x74, 0x138B);
        pas_write(0x74, 0x1389);
        pas_write(0, 0x1389);

        pas_write(0x80 | 0x40 | 0x20 | 1, 0x0B8A);
        pas_write(0x80 | 0x20 | 0x10 | 0x08 | 0x01, 0xF8A);
        pas_write(0x01 | 0x02 | 0x04 | 0x10     /*
                                                 * |
                                                 * 0x80
                                                 */ , 0xB88);

        pas_write(0x80 | (joystick ? 0x40 : 0), 0xF388);

        if (pas_irq < 0 || pas_irq > 15)
        {
                printk(KERN_ERR "PAS16: Invalid IRQ %d", pas_irq);
                hw_config->irq=-1;
                ok = 0;
        }
        else
        {
                int_ptrs = pas_read(0xF38A);
                int_ptrs = (int_ptrs & 0xf0) | irq_bits[pas_irq];
                pas_write(int_ptrs, 0xF38A);
                if (!irq_bits[pas_irq])
                {
                        printk(KERN_ERR "PAS16: Invalid IRQ %d", pas_irq);
                        hw_config->irq=-1;
                        ok = 0;
                }
                else
                {
                        if (request_irq(pas_irq, pasintr, 0, "PAS16",hw_config) < 0) {
                                printk(KERN_ERR "PAS16: Cannot allocate IRQ %d\n",pas_irq);
                                hw_config->irq=-1;
                                ok = 0;
                        }
                }
        }

        if (hw_config->dma < 0 || hw_config->dma > 7)
        {
                printk(KERN_ERR "PAS16: Invalid DMA selection %d", hw_config->dma);
                hw_config->dma=-1;
                ok = 0;
        }
        else
        {
                pas_write(dma_bits[hw_config->dma], 0xF389);
                if (!dma_bits[hw_config->dma])
                {
                        printk(KERN_ERR "PAS16: Invalid DMA selection %d", hw_config->dma);
                        hw_config->dma=-1;
                        ok = 0;
                }
                else
                {
                        if (sound_alloc_dma(hw_config->dma, "PAS16"))
                        {
                                printk(KERN_ERR "pas2_card.c: Can't allocate DMA channel\n");
                                hw_config->dma=-1;
                                ok = 0;
                        }
                }
        }

        /*
         * This fixes the timing problems of the PAS due to the Symphony chipset
         * as per Media Vision.  Only define this if your PAS doesn't work correctly.
         */

        if(symphony)
        {
                outb((0x05), 0xa8);
                outb((0x60), 0xa9);
        }

        if(broken_bus_clock)
                pas_write(0x01 | 0x10 | 0x20 | 0x04, 0x8388);
        else
                /*
                 * pas_write(0x01, 0x8388);
                 */
                pas_write(0x01 | 0x10 | 0x20, 0x8388);

        pas_write(0x18, 0x838A);        /* ??? */
        pas_write(0x20 | 0x01, 0x0B8A);         /* Mute off, filter = 17.897 kHz */
        pas_write(8, 0xBF8A);

        mix_write(0x80 | 5, 0x078B);
        mix_write(5, 0x078B);

        {
                struct address_info *sb_config;

                sb_config = &cfg2;
                if (sb_config->io_base)
                {
                        unsigned char   irq_dma;

                        /*
                         * Turn on Sound Blaster compatibility
                         * bit 1 = SB emulation
                         * bit 0 = MPU401 emulation (CDPC only :-( )
                         */
                        
                        pas_write(0x02, 0xF788);

                        /*
                         * "Emulation address"
                         */
                        
                        pas_write((sb_config->io_base >> 4) & 0x0f, 0xF789);
                        pas_sb_base = sb_config->io_base;

                        if (!sb_dma_bits[sb_config->dma])
                                printk(KERN_ERR "PAS16 Warning: Invalid SB DMA %d\n\n", sb_config->dma);

                        if (!sb_irq_bits[sb_config->irq])
                                printk(KERN_ERR "PAS16 Warning: Invalid SB IRQ %d\n\n", sb_config->irq);

                        irq_dma = sb_dma_bits[sb_config->dma] |
                                sb_irq_bits[sb_config->irq];

                        pas_write(irq_dma, 0xFB8A);
                }
                else
                        pas_write(0x00, 0xF788);
        }

        if (!ok)
                printk(KERN_WARNING "PAS16: Driver not enabled\n");

        return ok;
}

static int __init detect_pas_hw(struct address_info *hw_config)
{
        unsigned char   board_id, foo;

        /*
         * WARNING: Setting an option like W:1 or so that disables warm boot reset
         * of the card will screw up this detect code something fierce. Adding code
         * to handle this means possibly interfering with other cards on the bus if
         * you have something on base port 0x388. SO be forewarned.
         */

        outb((0xBC), 0x9A01);   /* Activate first board */
        outb((hw_config->io_base >> 2), 0x9A01);        /* Set base address */
        pas_translate_code = hw_config->io_base - 0x388;
        pas_write(1, 0xBF88);   /* Select one wait states */

        board_id = pas_read(0x0B8B);

        if (board_id == 0xff)
                return 0;

        /*
         * We probably have a PAS-series board, now check for a PAS16-series board
         * by trying to change the board revision bits. PAS16-series hardware won't
         * let you do this - the bits are read-only.
         */

        foo = board_id ^ 0xe0;

        pas_write(foo, 0x0B8B);
        foo = pas_read(0x0B8B);
        pas_write(board_id, 0x0B8B);

        if (board_id != foo)
                return 0;

        pas_model = pas_read(0xFF88);

        return pas_model;
}

static void __init attach_pas_card(struct address_info *hw_config)
{
        pas_irq = hw_config->irq;

        if (detect_pas_hw(hw_config))
        {

                if ((pas_model = pas_read(0xFF88)))
                {
                        char            temp[100];

                        if (pas_model < 0 ||
                            pas_model >= ARRAY_SIZE(pas_model_names)) {
                                printk(KERN_ERR "pas2 unrecognized model.\n");
                                return;
                        }
                        sprintf(temp,
                            "%s rev %d", pas_model_names[(int) pas_model],
                                    pas_read(0x2789));
                        conf_printf(temp, hw_config);
                }
                if (config_pas_hw(hw_config))
                {
                        pas_pcm_init(hw_config);
                        pas_midi_init();
                        pas_init_mixer();
                }
        }
}

static inline int __init probe_pas(struct address_info *hw_config)
{
        return detect_pas_hw(hw_config);
}

static void __exit unload_pas(struct address_info *hw_config)
{
        extern int pas_audiodev;
        extern int pas2_mididev;

        if (hw_config->dma>0)
                sound_free_dma(hw_config->dma);
        if (hw_config->irq>0)
                free_irq(hw_config->irq, hw_config);

        if(pas_audiodev!=-1)
                sound_unload_mixerdev(audio_devs[pas_audiodev]->mixer_dev);
        if(pas2_mididev!=-1)
                sound_unload_mididev(pas2_mididev);
        if(pas_audiodev!=-1)
                sound_unload_audiodev(pas_audiodev);
}

static int __initdata io        = -1;
static int __initdata irq       = -1;
static int __initdata dma       = -1;
static int __initdata dma16     = -1;   /* Set this for modules that need it */

static int __initdata sb_io     = 0;
static int __initdata sb_irq    = -1;
static int __initdata sb_dma    = -1;
static int __initdata sb_dma16  = -1;

module_param_hw(io, int, ioport, 0);
module_param_hw(irq, int, irq, 0);
module_param_hw(dma, int, dma, 0);
module_param_hw(dma16, int, dma, 0);

module_param_hw(sb_io, int, ioport, 0);
module_param_hw(sb_irq, int, irq, 0);
module_param_hw(sb_dma, int, dma, 0);
module_param_hw(sb_dma16, int, dma, 0);

module_param(joystick, bool, 0);
module_param(symphony, bool, 0);
module_param(broken_bus_clock, bool, 0);

MODULE_LICENSE("GPL");

static int __init init_pas2(void)
{
        printk(KERN_INFO "Pro Audio Spectrum driver Copyright (C) by Hannu Savolainen 1993-1996\n");

        cfg.io_base = io;
        cfg.irq = irq;
        cfg.dma = dma;
        cfg.dma2 = dma16;

        cfg2.io_base = sb_io;
        cfg2.irq = sb_irq;
        cfg2.dma = sb_dma;
        cfg2.dma2 = sb_dma16;

        if (cfg.io_base == -1 || cfg.dma == -1 || cfg.irq == -1) {
                printk(KERN_INFO "I/O, IRQ, DMA and type are mandatory\n");
                return -EINVAL;
        }

        if (!probe_pas(&cfg))
                return -ENODEV;
        attach_pas_card(&cfg);

        return 0;
}

static void __exit cleanup_pas2(void)
{
        unload_pas(&cfg);
}

module_init(init_pas2);
module_exit(cleanup_pas2);

#ifndef MODULE
static int __init setup_pas2(char *str)
{
        /* io, irq, dma, dma2, sb_io, sb_irq, sb_dma, sb_dma2 */
        int ints[9];
        
        str = get_options(str, ARRAY_SIZE(ints), ints);

        io      = ints[1];
        irq     = ints[2];
        dma     = ints[3];
        dma16   = ints[4];

        sb_io   = ints[5];
        sb_irq  = ints[6];
        sb_dma  = ints[7];
        sb_dma16 = ints[8];

        return 1;
}

__setup("pas2=", setup_pas2);
#endif