/*
 * sound/sscape.c
 *
 * Low level driver for Ensoniq SoundScape
 *
 *
 * 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.
 *
 *
 * Thomas Sailer        : ioctl code reworked (vmalloc/vfree removed)
 * Sergey Smitienko     : ensoniq p'n'p support
 * Christoph Hellwig    : adapted to module_init/module_exit
 * Bartlomiej Zolnierkiewicz : added __init to attach_sscape()
 * Chris Rankin         : Specify that this module owns the coprocessor
 * Arnaldo C. de Melo   : added missing restore_flags in sscape_pnp_upload_file
 */

#include <linux/init.h>
#include <linux/module.h>

#include "sound_config.h"
#include "sound_firmware.h"

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/fcntl.h>
#include <linux/ctype.h>
#include <linux/stddef.h>
#include <linux/kmod.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/segment.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/wrapper.h>

#include "coproc.h"

#include "ad1848.h"
#include "mpu401.h"

/*
 *    I/O ports
 */
#define MIDI_DATA       0
#define MIDI_CTRL       1
#define HOST_CTRL       2
#define TX_READY        0x02
#define RX_READY        0x01
#define HOST_DATA       3
#define ODIE_ADDR       4
#define ODIE_DATA       5

/*
 *    Indirect registers
 */

#define GA_INTSTAT_REG  0
#define GA_INTENA_REG   1
#define GA_DMAA_REG     2
#define GA_DMAB_REG     3
#define GA_INTCFG_REG   4
#define GA_DMACFG_REG   5
#define GA_CDCFG_REG    6
#define GA_SMCFGA_REG   7
#define GA_SMCFGB_REG   8
#define GA_HMCTL_REG    9

/*
 * DMA channel identifiers (A and B)
 */

#define SSCAPE_DMA_A    0
#define SSCAPE_DMA_B    1

#define PORT(name)      (devc->base+name)

/*
 * Host commands recognized by the OBP microcode
 */
 
#define CMD_GEN_HOST_ACK        0x80
#define CMD_GEN_MPU_ACK         0x81
#define CMD_GET_BOARD_TYPE      0x82
#define CMD_SET_CONTROL         0x88    /* Old firmware only */
#define CMD_GET_CONTROL         0x89    /* Old firmware only */
#define CTL_MASTER_VOL          0
#define CTL_MIC_MODE            2
#define CTL_SYNTH_VOL           4
#define CTL_WAVE_VOL            7
#define CMD_SET_EXTMIDI         0x8a
#define CMD_GET_EXTMIDI         0x8b
#define CMD_SET_MT32            0x8c
#define CMD_GET_MT32            0x8d

#define CMD_ACK                 0x80

#define IC_ODIE                 1
#define IC_OPUS                 2

typedef struct sscape_info
{
        int     base, irq, dma;
        
        int     codec, codec_irq;       /* required to setup pnp cards*/
        int     codec_type;
        int     ic_type;
        char*   raw_buf;
        unsigned long   raw_buf_phys;
        int     buffsize;               /* -------------------------- */
        
        int     ok;     /* Properly detected */
        int     failed;
        int     dma_allocated;
        int     codec_audiodev;
        int     opened;
        int     *osp;
        int     my_audiodev;
} sscape_info;

static struct sscape_info adev_info = {
        0
};

static struct sscape_info *devc = &adev_info;
static int sscape_mididev = -1;

/* Some older cards have assigned interrupt bits differently than new ones */
static char valid_interrupts_old[] = {
        9, 7, 5, 15
};

static char valid_interrupts_new[] = {
        9, 5, 7, 10
};

static char *valid_interrupts = valid_interrupts_new;

/*
 *      See the bottom of the driver. This can be set by spea =0/1.
 */
 
#ifdef REVEAL_SPEA
static char old_hardware = 1;
#else
static char old_hardware = 0;
#endif

static void sleep(unsigned howlong)
{
        current->state = TASK_INTERRUPTIBLE;
        schedule_timeout(howlong);
}

static unsigned char sscape_read(struct sscape_info *devc, int reg)
{
        unsigned long flags;
        unsigned char val;

        save_flags(flags);
        cli();
        outb(reg, PORT(ODIE_ADDR));
        val = inb(PORT(ODIE_DATA));
        restore_flags(flags);
        return val;
}

static void sscape_write(struct sscape_info *devc, int reg, int data)
{
        unsigned long flags;

        save_flags(flags);
        cli();
        outb(reg, PORT(ODIE_ADDR));
        outb(data, PORT(ODIE_DATA));
        restore_flags(flags);
}

static unsigned char sscape_pnp_read_codec(sscape_info* devc, unsigned char reg)
{
        unsigned char res;
        unsigned long flags;

        save_flags(flags);
        cli();  
        outb( reg, devc -> codec);
        res = inb (devc -> codec + 1);
        restore_flags(flags);
        return res;

}

static void sscape_pnp_write_codec(sscape_info* devc, unsigned char reg, unsigned char data)
{
        unsigned long flags;
        
        save_flags(flags);
        cli();
        outb( reg, devc -> codec);
        outb( data, devc -> codec + 1);
        restore_flags(flags);
}

static void host_open(struct sscape_info *devc)
{
        outb((0x00), PORT(HOST_CTRL));  /* Put the board to the host mode */
}

static void host_close(struct sscape_info *devc)
{
        outb((0x03), PORT(HOST_CTRL));  /* Put the board to the MIDI mode */
}

static int host_write(struct sscape_info *devc, unsigned char *data, int count)
{
        unsigned long flags;
        int i, timeout_val;

        save_flags(flags);
        cli();

        /*
         * Send the command and data bytes
         */

        for (i = 0; i < count; i++)
        {
                for (timeout_val = 10000; timeout_val > 0; timeout_val--)
                        if (inb(PORT(HOST_CTRL)) & TX_READY)
                                break;

                if (timeout_val <= 0)
                {
                            restore_flags(flags);
                            return 0;
                }
                outb(data[i], PORT(HOST_DATA));
        }
        restore_flags(flags);
        return 1;
}

static int host_read(struct sscape_info *devc)
{
        unsigned long flags;
        int timeout_val;
        unsigned char data;

        save_flags(flags);
        cli();

        /*
         * Read a byte
         */

        for (timeout_val = 10000; timeout_val > 0; timeout_val--)
                if (inb(PORT(HOST_CTRL)) & RX_READY)
                        break;

        if (timeout_val <= 0)
        {
                restore_flags(flags);
                return -1;
        }
        data = inb(PORT(HOST_DATA));
        restore_flags(flags);
        return data;
}

#if 0 /* unused */
static int host_command1(struct sscape_info *devc, int cmd)
{
        unsigned char buf[10];
        buf[0] = (unsigned char) (cmd & 0xff);
        return host_write(devc, buf, 1);
}
#endif /* unused */


static int host_command2(struct sscape_info *devc, int cmd, int parm1)
{
        unsigned char buf[10];

        buf[0] = (unsigned char) (cmd & 0xff);
        buf[1] = (unsigned char) (parm1 & 0xff);

        return host_write(devc, buf, 2);
}

static int host_command3(struct sscape_info *devc, int cmd, int parm1, int parm2)
{
        unsigned char buf[10];

        buf[0] = (unsigned char) (cmd & 0xff);
        buf[1] = (unsigned char) (parm1 & 0xff);
        buf[2] = (unsigned char) (parm2 & 0xff);
        return host_write(devc, buf, 3);
}

static void set_mt32(struct sscape_info *devc, int value)
{
        host_open(devc);
        host_command2(devc, CMD_SET_MT32, value ? 1 : 0);
        if (host_read(devc) != CMD_ACK)
        {
                /* printk( "SNDSCAPE: Setting MT32 mode failed\n"); */
        }
        host_close(devc);
}

static void set_control(struct sscape_info *devc, int ctrl, int value)
{
        host_open(devc);
        host_command3(devc, CMD_SET_CONTROL, ctrl, value);
        if (host_read(devc) != CMD_ACK)
        {
                /* printk( "SNDSCAPE: Setting control (%d) failed\n",  ctrl); */
        }
        host_close(devc);
}

static void do_dma(struct sscape_info *devc, int dma_chan, unsigned long buf, int blk_size, int mode)
{
        unsigned char temp;

        if (dma_chan != SSCAPE_DMA_A)
        {
                printk(KERN_WARNING "soundscape: Tried to use DMA channel  != A. Why?\n");
                return;
        }
        audio_devs[devc->codec_audiodev]->flags &= ~DMA_AUTOMODE;
        DMAbuf_start_dma(devc->codec_audiodev, buf, blk_size, mode);
        audio_devs[devc->codec_audiodev]->flags |= DMA_AUTOMODE;

        temp = devc->dma << 4;  /* Setup DMA channel select bits */
        if (devc->dma <= 3)
                temp |= 0x80;   /* 8 bit DMA channel */

        temp |= 1;              /* Trigger DMA */
        sscape_write(devc, GA_DMAA_REG, temp);
        temp &= 0xfe;           /* Clear DMA trigger */
        sscape_write(devc, GA_DMAA_REG, temp);
}

static int verify_mpu(struct sscape_info *devc)
{
        /*
         * The SoundScape board could be in three modes (MPU, 8250 and host).
         * If the card is not in the MPU mode, enabling the MPU driver will
         * cause infinite loop (the driver believes that there is always some
         * received data in the buffer.
         *
         * Detect this by looking if there are more than 10 received MIDI bytes
         * (0x00) in the buffer.
         */

        int i;

        for (i = 0; i < 10; i++)
        {
                if (inb(devc->base + HOST_CTRL) & 0x80)
                        return 1;

                if (inb(devc->base) != 0x00)
                        return 1;
        }
        printk(KERN_WARNING "SoundScape: The device is not in the MPU-401 mode\n");
        return 0;
}

static int sscape_coproc_open(void *dev_info, int sub_device)
{
        if (sub_device == COPR_MIDI)
        {
                set_mt32(devc, 0);
                if (!verify_mpu(devc))
                        return -EIO;
        }
        return 0;
}

static void sscape_coproc_close(void *dev_info, int sub_device)
{
        struct sscape_info *devc = dev_info;
        unsigned long   flags;

        save_flags(flags);
        cli();
        if (devc->dma_allocated)
        {
                sscape_write(devc, GA_DMAA_REG, 0x20);  /* DMA channel disabled */
                devc->dma_allocated = 0;
        }
        restore_flags(flags);
        return;
}

static void sscape_coproc_reset(void *dev_info)
{
}

static int sscape_download_boot(struct sscape_info *devc, unsigned char *block, int size, int flag)
{
        unsigned long flags;
        unsigned char temp;
        volatile int done, timeout_val;
        static unsigned char codec_dma_bits = 0;

        if (flag & CPF_FIRST)
        {
                /*
                 * First block. Have to allocate DMA and to reset the board
                 * before continuing.
                 */

                save_flags(flags);
                cli();
                codec_dma_bits = sscape_read(devc, GA_CDCFG_REG);

                if (devc->dma_allocated == 0)
                        devc->dma_allocated = 1;

                restore_flags(flags);

                sscape_write(devc, GA_HMCTL_REG, 
                        (temp = sscape_read(devc, GA_HMCTL_REG)) & 0x3f);       /*Reset */

                for (timeout_val = 10000; timeout_val > 0; timeout_val--)
                        sscape_read(devc, GA_HMCTL_REG);        /* Delay */

                /* Take board out of reset */
                sscape_write(devc, GA_HMCTL_REG,
                        (temp = sscape_read(devc, GA_HMCTL_REG)) | 0x80);
        }
        /*
         * Transfer one code block using DMA
         */
        if (audio_devs[devc->codec_audiodev]->dmap_out->raw_buf == NULL)
        {
                printk(KERN_WARNING "soundscape: DMA buffer not available\n");
                return 0;
        }
        memcpy(audio_devs[devc->codec_audiodev]->dmap_out->raw_buf, block, size);

        save_flags(flags);
        cli();
        
        /******** INTERRUPTS DISABLED NOW ********/
        
        do_dma(devc, SSCAPE_DMA_A,
               audio_devs[devc->codec_audiodev]->dmap_out->raw_buf_phys,
               size, DMA_MODE_WRITE);

        /*
         * Wait until transfer completes.
         */
        
        done = 0;
        timeout_val = 30;
        while (!done && timeout_val-- > 0)
        {
                int resid;

                if (HZ / 50)
                        sleep(HZ / 50);
                clear_dma_ff(devc->dma);
                if ((resid = get_dma_residue(devc->dma)) == 0)
                        done = 1;
        }

        restore_flags(flags);
        if (!done)
                return 0;

        if (flag & CPF_LAST)
        {
                /*
                 * Take the board out of reset
                 */
                outb((0x00), PORT(HOST_CTRL));
                outb((0x00), PORT(MIDI_CTRL));

                temp = sscape_read(devc, GA_HMCTL_REG);
                temp |= 0x40;
                sscape_write(devc, GA_HMCTL_REG, temp); /* Kickstart the board */

                /*
                 * Wait until the ODB wakes up
                 */

                save_flags(flags);
                cli();
                done = 0;
                timeout_val = 5 * HZ;
                while (!done && timeout_val-- > 0)
                {
                        unsigned char x;
                        
                        sleep(1);
                        x = inb(PORT(HOST_DATA));
                        if (x == 0xff || x == 0xfe)             /* OBP startup acknowledge */
                        {
                                DDB(printk("Soundscape: Acknowledge = %x\n", x));
                                done = 1;
                        }
                }
                sscape_write(devc, GA_CDCFG_REG, codec_dma_bits);

                restore_flags(flags);
                if (!done)
                {
                        printk(KERN_ERR "soundscape: The OBP didn't respond after code download\n");
                        return 0;
                }
                save_flags(flags);
                cli();
                done = 0;
                timeout_val = 5 * HZ;
                while (!done && timeout_val-- > 0)
                {
                        sleep(1);
                        if (inb(PORT(HOST_DATA)) == 0xfe)       /* Host startup acknowledge */
                                done = 1;
                }
                restore_flags(flags);
                if (!done)
                {
                        printk(KERN_ERR "soundscape: OBP Initialization failed.\n");
                        return 0;
                }
                printk(KERN_INFO "SoundScape board initialized OK\n");
                set_control(devc, CTL_MASTER_VOL, 100);
                set_control(devc, CTL_SYNTH_VOL, 100);

#ifdef SSCAPE_DEBUG3
                /*
                 * Temporary debugging aid. Print contents of the registers after
                 * downloading the code.
                 */
                {
                        int i;

                        for (i = 0; i < 13; i++)
                                printk("I%d = %02x (new value)\n", i, sscape_read(devc, i));
                }
#endif

        }
        return 1;
}

static int download_boot_block(void *dev_info, copr_buffer * buf)
{
        if (buf->len <= 0 || buf->len > sizeof(buf->data))
                return -EINVAL;

        if (!sscape_download_boot(devc, buf->data, buf->len, buf->flags))
        {
                printk(KERN_ERR "soundscape: Unable to load microcode block to the OBP.\n");
                return -EIO;
        }
        return 0;
}

static int sscape_coproc_ioctl(void *dev_info, unsigned int cmd, caddr_t arg, int local)
{
        copr_buffer *buf;
        int err;

        switch (cmd) 
        {
                case SNDCTL_COPR_RESET:
                        sscape_coproc_reset(dev_info);
                        return 0;

                case SNDCTL_COPR_LOAD:
                        buf = (copr_buffer *) vmalloc(sizeof(copr_buffer));
                        if (buf == NULL)
                                return -ENOSPC;
                        if (copy_from_user(buf, arg, sizeof(copr_buffer))) 
                        {
                                vfree(buf);
                                return -EFAULT;
                        }
                        err = download_boot_block(dev_info, buf);
                        vfree(buf);
                        return err;
                
                default:
                        return -EINVAL;
        }
}

static coproc_operations sscape_coproc_operations =
{
        "SoundScape M68K",
        THIS_MODULE,
        sscape_coproc_open,
        sscape_coproc_close,
        sscape_coproc_ioctl,
        sscape_coproc_reset,
        &adev_info
};

static int sscape_detected = 0;
static int sscape_is_pnp   = 0;

void __init attach_sscape(struct address_info *hw_config)
{
#ifndef SSCAPE_REGS
        /*
         * Config register values for Spea/V7 Media FX and Ensoniq S-2000.
         * These values are card
         * dependent. If you have another SoundScape based card, you have to
         * find the correct values. Do the following:
         *  - Compile this driver with SSCAPE_DEBUG1 defined.
         *  - Shut down and power off your machine.
         *  - Boot with DOS so that the SSINIT.EXE program is run.
         *  - Warm boot to {Linux|SYSV|BSD} and write down the lines displayed
         *    when detecting the SoundScape.
         *  - Modify the following list to use the values printed during boot.
         *    Undefine the SSCAPE_DEBUG1
         */
#define SSCAPE_REGS { \
/* I0 */        0x00, \
/* I1 */        0xf0, /* Note! Ignored. Set always to 0xf0 */ \
/* I2 */        0x20, /* Note! Ignored. Set always to 0x20 */ \
/* I3 */        0x20, /* Note! Ignored. Set always to 0x20 */ \
/* I4 */        0xf5, /* Ignored */ \
/* I5 */        0x10, \
/* I6 */        0x00, \
/* I7 */        0x2e, /* I7 MEM config A. Likely to vary between models */ \
/* I8 */        0x00, /* I8 MEM config B. Likely to vary between models */ \
/* I9 */        0x40 /* Ignored */ \
        }
#endif

        unsigned long   flags;
        static unsigned char regs[10] = SSCAPE_REGS;

        int i, irq_bits = 0xff;

        if (sscape_detected != hw_config->io_base)
                return;

        request_region(devc->base + 2, 6, "SoundScape");
        if (old_hardware)
        {
                valid_interrupts = valid_interrupts_old;
                conf_printf("Ensoniq SoundScape (old)", hw_config);
        }
        else
                conf_printf("Ensoniq SoundScape", hw_config);

        for (i = 0; i < sizeof(valid_interrupts); i++)
        {
                if (hw_config->irq == valid_interrupts[i])
                {
                        irq_bits = i;
                        break;
                }
        }
        if (hw_config->irq > 15 || ((regs[4] = irq_bits) == 0xff))
        {
                printk(KERN_ERR "Invalid IRQ%d\n", hw_config->irq);
                return;
        }
        
        if (!sscape_is_pnp) {
        
            save_flags(flags);
            cli();
            for (i = 1; i < 10; i++)
            {
                switch (i)
                {
                        case 1: /* Host interrupt enable */
                                sscape_write(devc, i, 0xf0);    /* All interrupts enabled */
                                break;

                        case 2: /* DMA A status/trigger register */
                        case 3: /* DMA B status/trigger register */
                                sscape_write(devc, i, 0x20);    /* DMA channel disabled */
                                break;

                        case 4: /* Host interrupt config reg */
                                sscape_write(devc, i, 0xf0 | (irq_bits << 2) | irq_bits);
                                break;

                        case 5: /* Don't destroy CD-ROM DMA config bits (0xc0) */
                                sscape_write(devc, i, (regs[i] & 0x3f) | (sscape_read(devc, i) & 0xc0));
                                break;

                        case 6: /* CD-ROM config (WSS codec actually) */
                                sscape_write(devc, i, regs[i]);
                                break;

                        case 9: /* Master control reg. Don't modify CR-ROM bits. Disable SB emul */
                                sscape_write(devc, i, (sscape_read(devc, i) & 0xf0) | 0x08);
                                break;

                        default:
                                sscape_write(devc, i, regs[i]);
                }
            }
            restore_flags(flags);
        }
#ifdef SSCAPE_DEBUG2
        /*
         * Temporary debugging aid. Print contents of the registers after
         * changing them.
         */
        {
                int i;

                for (i = 0; i < 13; i++)
                        printk("I%d = %02x (new value)\n", i, sscape_read(devc, i));
        }
#endif

        if (probe_mpu401(hw_config))
                hw_config->always_detect = 1;
        hw_config->name = "SoundScape";

        hw_config->irq *= -1;   /* Negative value signals IRQ sharing */
        attach_mpu401(hw_config, THIS_MODULE);
        hw_config->irq *= -1;   /* Restore it */

        if (hw_config->slots[1] != -1)  /* The MPU driver installed itself */
        {
                sscape_mididev = hw_config->slots[1];
                midi_devs[hw_config->slots[1]]->coproc = &sscape_coproc_operations;
        }
        sscape_write(devc, GA_INTENA_REG, 0x80);        /* Master IRQ enable */
        devc->ok = 1;
        devc->failed = 0;
}

static int detect_ga(sscape_info * devc)
{
        unsigned char save;

        DDB(printk("Entered Soundscape detect_ga(%x)\n", devc->base));

        if (check_region(devc->base, 8))
                return 0;

        /*
         * First check that the address register of "ODIE" is
         * there and that it has exactly 4 writable bits.
         * First 4 bits
         */
        
        if ((save = inb(PORT(ODIE_ADDR))) & 0xf0)
        {
                DDB(printk("soundscape: Detect error A\n"));
                return 0;
        }
        outb((0x00), PORT(ODIE_ADDR));
        if (inb(PORT(ODIE_ADDR)) != 0x00)
        {
                DDB(printk("soundscape: Detect error B\n"));
                return 0;
        }
        outb((0xff), PORT(ODIE_ADDR));
        if (inb(PORT(ODIE_ADDR)) != 0x0f)
        {
                DDB(printk("soundscape: Detect error C\n"));
                return 0;
        }
        outb((save), PORT(ODIE_ADDR));

        /*
         * Now verify that some indirect registers return zero on some bits.
         * This may break the driver with some future revisions of "ODIE" but...
         */

        if (sscape_read(devc, 0) & 0x0c)
        {
                DDB(printk("soundscape: Detect error D (%x)\n", sscape_read(devc, 0)));
                return 0;
        }
        if (sscape_read(devc, 1) & 0x0f)
        {
                DDB(printk("soundscape: Detect error E\n"));
                return 0;
        }
        if (sscape_read(devc, 5) & 0x0f)
        {
                DDB(printk("soundscape: Detect error F\n"));
                return 0;
        }
        return 1;
}

static  int sscape_read_host_ctrl(sscape_info* devc)
{
        return host_read(devc);
}

static  void sscape_write_host_ctrl2(sscape_info *devc, int a, int b)
{
        host_command2(devc, a, b);
}

static int sscape_alloc_dma(sscape_info *devc)
{
        char *start_addr, *end_addr;
        int dma_pagesize;
        int sz, size;
        struct page *page;

        if (devc->raw_buf != NULL) return 0;    /* Already done */
        dma_pagesize = (devc->dma < 4) ? (64 * 1024) : (128 * 1024);
        devc->raw_buf = NULL;
        devc->buffsize = 8192*4;
        if (devc->buffsize > dma_pagesize) devc->buffsize = dma_pagesize;
        start_addr = NULL;
        /*
         * Now loop until we get a free buffer. Try to get smaller buffer if
         * it fails. Don't accept smaller than 8k buffer for performance
         * reasons.
         */
        while (start_addr == NULL && devc->buffsize > PAGE_SIZE) {
                for (sz = 0, size = PAGE_SIZE; size < devc->buffsize; sz++, size <<= 1);
                devc->buffsize = PAGE_SIZE * (1 << sz);
                start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA, sz);
                if (start_addr == NULL) devc->buffsize /= 2;
        }

        if (start_addr == NULL) {
                printk(KERN_ERR "sscape pnp init error: Couldn't allocate DMA buffer\n");
                return 0;
        } else {
                /* make some checks */
                end_addr = start_addr + devc->buffsize - 1;             
                /* now check if it fits into the same dma-pagesize */

                if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1))
                    || end_addr >= (char *) (MAX_DMA_ADDRESS)) {
                        printk(KERN_ERR "sscape pnp: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, devc->buffsize);
                        return 0;
                }
        }
        devc->raw_buf = start_addr;
        devc->raw_buf_phys = virt_to_bus(start_addr);

        for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
                mem_map_reserve(page);
        return 1;
}

static void sscape_free_dma(sscape_info *devc)
{
        int sz, size;
        unsigned long start_addr, end_addr;
        struct page *page;

        if (devc->raw_buf == NULL) return;
        for (sz = 0, size = PAGE_SIZE; size < devc->buffsize; sz++, size <<= 1);
        start_addr = (unsigned long) devc->raw_buf;
        end_addr = start_addr + devc->buffsize;

        for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
                mem_map_unreserve(page);

        free_pages((unsigned long) devc->raw_buf, sz);
        devc->raw_buf = NULL;
}

/* Intel version !!!!!!!!! */

static int sscape_start_dma(int chan, unsigned long physaddr, int count, int dma_mode)
{
        unsigned long flags;

        flags = claim_dma_lock();
        disable_dma(chan);
        clear_dma_ff(chan);
        set_dma_mode(chan, dma_mode);
        set_dma_addr(chan, physaddr);
        set_dma_count(chan, count);
        enable_dma(chan);
        release_dma_lock(flags);
        return 0;
}

static void sscape_pnp_start_dma(sscape_info* devc, int arg )
{
        int reg;
        if (arg == 0) reg = 2;
        else reg = 3;

        sscape_write(devc, reg, sscape_read( devc, reg) | 0x01);
        sscape_write(devc, reg, sscape_read( devc, reg) & 0xFE);
}

static int sscape_pnp_wait_dma (sscape_info* devc, int arg )
{
        int             reg;
        unsigned long   i;
        unsigned char   d;

        if (arg == 0) reg = 2;
        else reg = 3;

        sleep ( 1 );
        i = 0;
        do {
                d = sscape_read(devc, reg) & 1;
                if ( d == 1)  break;
                i++;
        } while (i < 500000);
        d = sscape_read(devc, reg) & 1; 
        return d;
}

static  int     sscape_pnp_alloc_dma(sscape_info* devc)
{
        /* printk(KERN_INFO "sscape: requesting dma\n"); */
        if (request_dma(devc -> dma, "sscape")) return 0;
        /* printk(KERN_INFO "sscape: dma channel allocated\n"); */
        if (!sscape_alloc_dma(devc)) {
                free_dma(devc -> dma);
                return 0;
        };
        return 1;
}

static  void    sscape_pnp_free_dma(sscape_info* devc)
{
        sscape_free_dma( devc);
        free_dma(devc -> dma ); 
        /* printk(KERN_INFO "sscape: dma released\n"); */
}

static  int     sscape_pnp_upload_file(sscape_info* devc, char* fn)
{       
        int             done = 0;
        int             timeout_val;
        char*           data,*dt;
        int             len,l;
        unsigned long   flags;

        sscape_write( devc, 9, sscape_read(devc, 9 )  & 0x3F );
        sscape_write( devc, 2, (devc -> dma << 4) | 0x80 );
        sscape_write( devc, 3, 0x20 );
        sscape_write( devc, 9, sscape_read( devc, 9 )  | 0x80 );
        
        len = mod_firmware_load(fn, &data);
        if (len == 0) {
                    printk(KERN_ERR "sscape: file not found: %s\n", fn);
                    return 0;
        }
        dt = data;
        save_flags(flags);
        cli();
        while ( len > 0 ) {
                if (len > devc -> buffsize) l = devc->buffsize;
                else l = len;
                len -= l;               
                memcpy(devc->raw_buf, dt, l); dt += l;
                sscape_start_dma(devc->dma, devc->raw_buf_phys, l, 0x48);
                sscape_pnp_start_dma ( devc, 0 );
                if (sscape_pnp_wait_dma ( devc, 0 ) == 0) {
                        restore_flags(flags);       
                        return 0;
                }
        }
        
        restore_flags(flags);       
        vfree(data);
        
        outb(0, devc -> base + 2);
        outb(0, devc -> base);

        sscape_write ( devc, 9, sscape_read( devc, 9 ) | 0x40);

        timeout_val = 5 * HZ; 
        while (!done && timeout_val-- > 0)
        {
                unsigned char x;
                sleep(1);
                x = inb( devc -> base + 3);
                if (x == 0xff || x == 0xfe)             /* OBP startup acknowledge */
                {
                        //printk(KERN_ERR "Soundscape: Acknowledge = %x\n", x);
                        done = 1;
                }
        }
        timeout_val = 5 * HZ;
        done = 0;

        while (!done && timeout_val-- > 0)
        {
                unsigned char x;
                sleep(1);
                x = inb( devc -> base + 3);
                if (x == 0xfe)          /* OBP startup acknowledge */
                {
                        //printk(KERN_ERR "Soundscape: Acknowledge = %x\n", x);
                        done = 1;
                }
        }

        if ( !done ) printk(KERN_ERR "soundscape: OBP Initialization failed.\n");

        sscape_write( devc, 2, devc->ic_type == IC_ODIE ? 0x70 : 0x40);
        sscape_write( devc, 3, (devc -> dma << 4) + 0x80);
        return 1;
}

static void __init sscape_pnp_init_hw(sscape_info* devc)
{       
        unsigned char midi_irq = 0, sb_irq = 0;
        unsigned i;
        static  char code_file_name[23] = "/sndscape/sndscape.cox";
        
        int sscape_sb_enable            = 0;
        int sscape_joystic_enable       = 0x7f;
        int sscape_mic_enable           = 0;
        int sscape_ext_midi             = 0;            

        if ( !sscape_pnp_alloc_dma(devc) ) {
                printk(KERN_ERR "sscape: faild to allocate dma\n");
                return;
        }

        for (i = 0; i < 4; i++) {
                if ( devc -> irq   == valid_interrupts[i] ) 
                        midi_irq = i;
                if ( devc -> codec_irq == valid_interrupts[i] ) 
                        sb_irq = i;
        }

        sscape_write( devc, 5, 0x50);
        sscape_write( devc, 7, 0x2e);
        sscape_write( devc, 8, 0x00);

        sscape_write( devc, 2, devc->ic_type == IC_ODIE ? 0x70 : 0x40);
        sscape_write( devc, 3, ( devc -> dma << 4) | 0x80);

        if ( sscape_sb_enable )
                sscape_write (devc, 4, 0xF0 | (sb_irq << 2) | midi_irq);
        else    
                sscape_write (devc, 4, 0xF0 | (midi_irq<<2) | midi_irq);

        i = 0x10; //sscape_read(devc, 9) & (devc->ic_type == IC_ODIE ? 0xf0 : 0xc0);
        if ( sscape_sb_enable )
                i |= devc->ic_type == IC_ODIE ? 0x05 : 0x07;        
        if (sscape_joystic_enable) i |= 8;
        
        sscape_write (devc, 9, i);
        sscape_write (devc, 6, 0x80);
        sscape_write (devc, 1, 0x80);

        if (devc -> codec_type == 2) {
                sscape_pnp_write_codec( devc, 0x0C, 0x50);
                sscape_pnp_write_codec( devc, 0x10, sscape_pnp_read_codec( devc, 0x10) & 0x3F);
                sscape_pnp_write_codec( devc, 0x11, sscape_pnp_read_codec( devc, 0x11) | 0xC0);
                sscape_pnp_write_codec( devc, 29, 0x20);
        }

        if (sscape_pnp_upload_file(devc, "/sndscape/scope.cod") == 0 ) {
                printk(KERN_ERR "sscape: faild to upload file /sndscape/scope.cod\n");
                sscape_pnp_free_dma(devc);
                return;
        }

        i = sscape_read_host_ctrl( devc );
        
        if ( (i & 0x0F) >  7 ) {
                printk(KERN_ERR "sscape: scope.cod faild\n");
                sscape_pnp_free_dma(devc);
                return;
        }
        if ( i & 0x10 ) sscape_write( devc, 7, 0x2F);
        code_file_name[21] = (char) ( i & 0x0F) + 0x30;
        if (sscape_pnp_upload_file( devc, code_file_name) == 0) {
                printk(KERN_ERR "sscape: faild to upload file %s\n", code_file_name);
                sscape_pnp_free_dma(devc);
                return;
        }
        
        if (devc->ic_type != IC_ODIE) {
                sscape_pnp_write_codec( devc, 10, (sscape_pnp_read_codec(devc, 10) & 0x7f) |
                 ( sscape_mic_enable == 0 ? 0x00 : 0x80) );
        }
        sscape_write_host_ctrl2( devc, 0x84, 0x64 );  /* MIDI volume */
        sscape_write_host_ctrl2( devc, 0x86, 0x64 );  /* MIDI volume?? */
        sscape_write_host_ctrl2( devc, 0x8A, sscape_ext_midi);

        sscape_pnp_write_codec ( devc, 6, 0x3f ); //WAV_VOL
        sscape_pnp_write_codec ( devc, 7, 0x3f ); //WAV_VOL
        sscape_pnp_write_codec ( devc, 2, 0x1F ); //WD_CDXVOLL
        sscape_pnp_write_codec ( devc, 3, 0x1F ); //WD_CDXVOLR

        if (devc -> codec_type == 1) {
                sscape_pnp_write_codec ( devc, 4, 0x1F );
                sscape_pnp_write_codec ( devc, 5, 0x1F );
                sscape_write_host_ctrl2( devc, 0x88, sscape_mic_enable);
        } else {
                int t;
                sscape_pnp_write_codec ( devc, 0x10, 0x1F << 1);
                sscape_pnp_write_codec ( devc, 0x11, 0xC0 | (0x1F << 1));

                t = sscape_pnp_read_codec( devc, 0x00) & 0xDF;
                if ( (sscape_mic_enable == 0)) t |= 0;
                else t |= 0x20;
                sscape_pnp_write_codec ( devc, 0x00, t);
                t = sscape_pnp_read_codec( devc, 0x01) & 0xDF;
                if ( (sscape_mic_enable == 0) ) t |= 0;
                else t |= 0x20;
                sscape_pnp_write_codec ( devc, 0x01, t);
                sscape_pnp_write_codec ( devc, 0x40 | 29 , 0x20);
                outb(0, devc -> codec);
        }
        if (devc -> ic_type == IC_OPUS ) {
                int i = sscape_read( devc, 9 );
                sscape_write( devc, 9, i | 3 );
                sscape_write( devc, 3, 0x40);

                if (check_region(0x228, 1)) {
                            outb(0, 0x228);
                            release_region(0x228,1);
                }
                sscape_write( devc, 3, (devc -> dma << 4) | 0x80);
                sscape_write( devc, 9, i );
        }
        
        host_close ( devc );
        sscape_pnp_free_dma(devc);
}

static int __init detect_sscape_pnp(sscape_info* devc)
{
        long     i, irq_bits = 0xff;
        unsigned int d;

        DDB(printk("Entered detect_sscape_pnp(%x)\n", devc->base));

        if (check_region(devc->base, 8)) {
                printk(KERN_ERR "detect_sscape_pnp: port %x is not free\n", devc->base);        
                return 0;
        }
                
        if (check_region(devc->codec, 2)) {
                printk(KERN_ERR "detect_sscape_pnp: port %x is not free\n", devc->codec);       
                return 0;
        }

        if ( (inb( devc -> base + 2) & 0x78) != 0) return 0;

        d = inb ( devc -> base + 4) & 0xF0;
        if (  (d & 0x80) != 0)  return 0;
        
        if (d == 0) {
                        devc->codec_type = 1;
                        devc->ic_type = IC_ODIE;
        }
        else if ( (d & 0x60) != 0) {
                        devc->codec_type = 2;
                        devc->ic_type = IC_OPUS;
        }
        else if ( (d & 0x40) != 0) {
                        devc->codec_type = 2;
                        devc->ic_type = IC_ODIE;
        } 
        else return 0;
        
        sscape_is_pnp = 1;
                
        outb(0xFA, devc -> base+4);
        if  ((inb( devc -> base+4) & 0x9F) != 0x0A)
                return 0;
        outb(0xFE, devc -> base+4);
        if  ( (inb(devc -> base+4) & 0x9F) != 0x0E)
                return 0;
        if  ( (inb(devc -> base+5) & 0x9F) != 0x0E)
                return 0;

        if (devc->codec_type == 2) {
                if (devc -> codec != devc -> base + 8)
                        printk("soundscape warning: incorrect codec port specified\n");
                devc -> codec = devc -> base + 8;
                d = 0x10 | (sscape_read(devc, 9)  & 0xCF);
                sscape_write(devc, 9, d);
                sscape_write(devc, 6, 0x80);
        } else {
                //todo: check codec is not base + 8
        }

        d  = (sscape_read(devc, 9) & 0x3F) | 0xC0;
        sscape_write(devc, 9, d);

        for (i = 0; i < 550000; i++)
                if ( !(inb(devc -> codec) & 0x80) ) break;

        d = inb(devc -> codec);
        if (d & 0x80)
                return 0;
        if ( inb(devc -> codec + 2) == 0xFF)
                return 0;

        sscape_write(devc, 9, sscape_read(devc, 9)  & 0x3F );

        d  = inb(devc -> codec) & 0x80;
        if ( d == 0) {
                printk(KERN_INFO "soundscape: hardware detected\n");
                valid_interrupts = valid_interrupts_new;
        } else  {
                printk(KERN_INFO "soundscape: board looks like media fx\n");
                valid_interrupts = valid_interrupts_old;
                old_hardware = 1;
        }

        sscape_write( devc, 9, 0xC0 | (sscape_read(devc, 9)  & 0x3F) );

        for (i = 0; i < 550000; i++)
                if ( !(inb(devc -> codec) & 0x80)) 
                        break;
                
        sscape_pnp_init_hw(devc);

        for (i = 0; i < sizeof(valid_interrupts); i++)
        {
                if (devc->codec_irq == valid_interrupts[i]) {
                        irq_bits = i;
                        break;
                }
        }       
        sscape_write(devc, GA_INTENA_REG, 0x00);
        sscape_write(devc, GA_DMACFG_REG, 0x50);
        sscape_write(devc, GA_DMAA_REG, 0x70);
        sscape_write(devc, GA_DMAB_REG, 0x20);
        sscape_write(devc, GA_INTCFG_REG, 0xf0);
        sscape_write(devc, GA_CDCFG_REG, 0x89 | (devc->dma << 4) | (irq_bits << 1));

        sscape_pnp_write_codec( devc, 0, sscape_pnp_read_codec( devc, 0) | 0x20);
        sscape_pnp_write_codec( devc, 0, sscape_pnp_read_codec( devc, 1) | 0x20);

        return 1;       
}

static int __init probe_sscape(struct address_info *hw_config)
{

        if (sscape_detected != 0 && sscape_detected != hw_config->io_base)
                return 0;

        devc->base = hw_config->io_base;
        devc->irq = hw_config->irq;
        devc->dma = hw_config->dma;
        devc->osp = hw_config->osp;

#ifdef SSCAPE_DEBUG1
        /*
         * Temporary debugging aid. Print contents of the registers before
         * changing them.
         */
        {
                int i;

                for (i = 0; i < 13; i++)
                        printk("I%d = %02x (old value)\n", i, sscape_read(devc, i));
        }
#endif
        devc->failed = 1;

        if (!detect_ga(devc)) {
                if (detect_sscape_pnp(devc)) {                  
                        sscape_detected = hw_config->io_base;
                        return 1;
                } 
                else return 0;
        }

        if (old_hardware)       /* Check that it's really an old Spea/Reveal card. */
        {
                unsigned char   tmp;
                int             cc;

                if (!((tmp = sscape_read(devc, GA_HMCTL_REG)) & 0xc0))
                {
                        sscape_write(devc, GA_HMCTL_REG, tmp | 0x80);
                        for (cc = 0; cc < 200000; ++cc)
                                inb(devc->base + ODIE_ADDR);
                }
        }
        sscape_detected = hw_config->io_base;
        return 1;
}

static int __init probe_ss_ms_sound(struct address_info *hw_config)
{
        int i, irq_bits = 0xff;
        int ad_flags = 0;
        
        if (devc->failed)
        {
                printk(KERN_ERR "soundscape: Card not detected\n");
                return 0;
        }
        if (devc->ok == 0)
        {
                printk(KERN_ERR "soundscape: Invalid initialization order.\n");
                return 0;
        }
        for (i = 0; i < sizeof(valid_interrupts); i++)
        {
                if (hw_config->irq == valid_interrupts[i])
                {
                        irq_bits = i;
                        break;
                }
        }
        if (hw_config->irq > 15 || irq_bits == 0xff)
        {
                printk(KERN_ERR "soundscape: Invalid MSS IRQ%d\n", hw_config->irq);
                return 0;
        }
        
        if (!sscape_is_pnp) {
                if (old_hardware)
                        ad_flags = 0x12345677;  /* Tell that we may have a CS4248 chip (Spea-V7 Media FX) */
                return ad1848_detect(hw_config->io_base, &ad_flags, hw_config->osp);
        } 
        else {
                if (old_hardware)
                        ad_flags = 0x12345677;  /* Tell that we may have a CS4248 chip (Spea-V7 Media FX) */
                else
                        ad_flags = 0x87654321;  /* Tell that we have a soundscape pnp with 1845 chip */
                return ad1848_detect(hw_config->io_base, &ad_flags, hw_config->osp);
        }
}

static void __init attach_ss_ms_sound(struct address_info *hw_config)
{
        /*
         * This routine configures the SoundScape card for use with the
         * Win Sound System driver. The AD1848 codec interface uses the CD-ROM
         * config registers of the "ODIE".
         */

        int i, irq_bits = 0xff;

                
        if (!sscape_is_pnp)  /*pnp is already setup*/
        {
                /*
                 * Setup the DMA polarity.
                 */
                sscape_write(devc, GA_DMACFG_REG, 0x50);
        
                /*
                 * Take the gate-array off of the DMA channel.
                 */
                sscape_write(devc, GA_DMAB_REG, 0x20);
        
                /*
                 * Init the AD1848 (CD-ROM) config reg.
                 */
                for (i = 0; i < sizeof(valid_interrupts); i++)
                {
                        if (hw_config->irq == valid_interrupts[i])
                        {
                                irq_bits = i;
                                break;
                        }
                }       
                sscape_write(devc, GA_CDCFG_REG, 0x89 | (hw_config->dma << 4) | (irq_bits << 1));
        }
        
        if (hw_config->irq == devc->irq)
                printk(KERN_WARNING "soundscape: Warning! The WSS mode can't share IRQ with MIDI\n");
                                
        hw_config->slots[0] = ad1848_init(
                        sscape_is_pnp ? "SoundScape" : "SoundScape PNP",
                        hw_config->io_base,
                        hw_config->irq,
                        hw_config->dma,
                        hw_config->dma,
                        0,
                        devc->osp,
                        THIS_MODULE);

                                          
        if (hw_config->slots[0] != -1)  /* The AD1848 driver installed itself */
        {
                audio_devs[hw_config->slots[0]]->coproc = &sscape_coproc_operations;
                devc->codec_audiodev = hw_config->slots[0];
                devc->my_audiodev = hw_config->slots[0];

                /* Set proper routings here (what are they) */
                AD1848_REROUTE(SOUND_MIXER_LINE1, SOUND_MIXER_LINE);
        }
                
#ifdef SSCAPE_DEBUG5
        /*
         * Temporary debugging aid. Print contents of the registers
         * after the AD1848 device has been initialized.
         */
        {
                int i;

                for (i = 0; i < 13; i++)
                        printk("I%d = %02x\n", i, sscape_read(devc, i));
        }
#endif

}

static void __exit unload_sscape(struct address_info *hw_config)
{
        release_region(devc->base + 2, 6);
        unload_mpu401(hw_config);
}

static void __exit unload_ss_ms_sound(struct address_info *hw_config)
{
        ad1848_unload(hw_config->io_base,
                      hw_config->irq,
                      devc->dma,
                      devc->dma,
                      0);
        sound_unload_audiodev(hw_config->slots[0]);
}

static struct address_info cfg;
static struct address_info cfg_mpu;

static int __initdata spea = -1;
static int __initdata mss = 0;
static int __initdata dma = -1;
static int __initdata irq = -1;
static int __initdata io = -1;
static int __initdata mpu_irq = -1;
static int __initdata mpu_io = -1;

MODULE_PARM(dma, "i");
MODULE_PARM(irq, "i");
MODULE_PARM(io, "i");
MODULE_PARM(spea, "i");         /* spea=0/1 set the old_hardware */
MODULE_PARM(mpu_irq, "i");
MODULE_PARM(mpu_io, "i");
MODULE_PARM(mss, "i");

static int __init init_sscape(void)
{
        printk(KERN_INFO "Soundscape driver Copyright (C) by Hannu Savolainen 1993-1996\n");
        
        cfg.irq = irq;
        cfg.dma = dma;
        cfg.io_base = io;

        cfg_mpu.irq = mpu_irq;
        cfg_mpu.io_base = mpu_io;
        /* WEH - Try to get right dma channel */
        cfg_mpu.dma = dma;
        
        devc->codec = cfg.io_base;
        devc->codec_irq = cfg.irq;
        devc->codec_type = 0;
        devc->ic_type = 0;
        devc->raw_buf = NULL;

        if (cfg.dma == -1 || cfg.irq == -1 || cfg.io_base == -1) {
                printk(KERN_ERR "DMA, IRQ, and IO port must be specified.\n");
                return -EINVAL;
        }
        
        if (cfg_mpu.irq == -1 && cfg_mpu.io_base != -1) {
                printk(KERN_ERR "MPU_IRQ must be specified if MPU_IO is set.\n");
                return -EINVAL;
        }
        
        if(spea != -1) {
                old_hardware = spea;
                printk(KERN_INFO "Forcing %s hardware support.\n",
                        spea?"new":"old");
        }       
        if (probe_sscape(&cfg_mpu) == 0)
                return -ENODEV;

        attach_sscape(&cfg_mpu);
        
        mss = probe_ss_ms_sound(&cfg);

        if (mss)
                attach_ss_ms_sound(&cfg);

        return 0;
}

static void __exit cleanup_sscape(void)
{
        if (mss)
                unload_ss_ms_sound(&cfg);
        unload_sscape(&cfg_mpu);
}

module_init(init_sscape);
module_exit(cleanup_sscape);

#ifndef MODULE
static int __init setup_sscape(char *str)
{
        /* io, irq, dma, mpu_io, mpu_irq */
        int ints[6];
        
        str = get_options(str, ARRAY_SIZE(ints), ints);
        
        io      = ints[1];
        irq     = ints[2];
        dma     = ints[3];
        mpu_io  = ints[4];
        mpu_irq = ints[5];

        return 1;
}

__setup("sscape=", setup_sscape);
#endif
MODULE_LICENSE("GPL");