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#include <linux/types.h>

#include <linux/mm.h>

#include <linux/blk.h>

#include <linux/sched.h>

#include <linux/version.h>

#include <linux/init.h>

#include <asm/setup.h>

#include <asm/page.h>

#include <asm/pgtable.h>

#include <asm/amigaints.h>

#include <asm/amigahw.h>

#include <linux/zorro.h>

#include <asm/irq.h>

#include <linux/spinlock.h>

#include "scsi.h"

#include "hosts.h"

#include "wd33c93.h"

#include "a2091.h"

#include<linux/stat.h>

#define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))

#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))

static struct Scsi_Host *first_instance = NULL;

static Scsi_Host_Template *a2091_template;

static void a2091_intr (int irq, void *dummy, struct pt_regs *fp)

{

    unsigned long flags;

    unsigned int status;

    struct Scsi_Host *instance;

    for (instance = first_instance; instance &&

         instance->hostt == a2091_template; instance = instance->next)

    {

        status = DMA(instance)->ISTR;

        if (!(status & (ISTR_INT_F|ISTR_INT_P)))

                continue;

        if (status & ISTR_INTS) {

                spin_lock_irqsave(&io_request_lock, flags);

                wd33c93_intr (instance);

                spin_unlock_irqrestore(&io_request_lock, flags);

        }

    }

}

static int dma_setup (Scsi_Cmnd *cmd, int dir_in)

{

    unsigned short cntr = CNTR_PDMD | CNTR_INTEN;

    unsigned long addr = virt_to_bus(cmd->SCp.ptr);

    struct Scsi_Host *instance = cmd->host;

    /* don't allow DMA if the physical address is bad */

    if (addr & A2091_XFER_MASK ||

        (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))

    {

        HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511)

            & ~0x1ff;

        HDATA(instance)->dma_bounce_buffer =

            scsi_malloc (HDATA(instance)->dma_bounce_len);

        /* can't allocate memory; use PIO */

        if (!HDATA(instance)->dma_bounce_buffer) {

            HDATA(instance)->dma_bounce_len = 0;

            return 1;

        }

        /* get the physical address of the bounce buffer */

        addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);

        /* the bounce buffer may not be in the first 16M of physmem */

        if (addr & A2091_XFER_MASK) {

            /* we could use chipmem... maybe later */

            scsi_free (HDATA(instance)->dma_bounce_buffer,

                       HDATA(instance)->dma_bounce_len);

            HDATA(instance)->dma_bounce_buffer = NULL;

            HDATA(instance)->dma_bounce_len = 0;

            return 1;

        }

        if (!dir_in) {

            /* copy to bounce buffer for a write */

            if (cmd->use_sg)

#if 0

                panic ("scsi%ddma: incomplete s/g support",

                       instance->host_no);

#else

                memcpy (HDATA(instance)->dma_bounce_buffer,

                        cmd->SCp.ptr, cmd->SCp.this_residual);

#endif

            else

                memcpy (HDATA(instance)->dma_bounce_buffer,

                        cmd->request_buffer, cmd->request_bufflen);

        }

    }

    /* setup dma direction */

    if (!dir_in)

        cntr |= CNTR_DDIR;

    /* remember direction */

    HDATA(cmd->host)->dma_dir = dir_in;

    DMA(cmd->host)->CNTR = cntr;

    /* setup DMA *physical* address */

    DMA(cmd->host)->ACR = addr;

    if (dir_in){

        /* invalidate any cache */

        cache_clear (addr, cmd->SCp.this_residual);

    }else{

        /* push any dirty cache */

        cache_push (addr, cmd->SCp.this_residual);

      }

    /* start DMA */

    DMA(cmd->host)->ST_DMA = 1;

    /* return success */

    return 0;

}

static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,

                      int status)

{

    /* disable SCSI interrupts */

    unsigned short cntr = CNTR_PDMD;

    if (!HDATA(instance)->dma_dir)

            cntr |= CNTR_DDIR;

    /* disable SCSI interrupts */

    DMA(instance)->CNTR = cntr;

    /* flush if we were reading */

    if (HDATA(instance)->dma_dir) {

        DMA(instance)->FLUSH = 1;

        while (!(DMA(instance)->ISTR & ISTR_FE_FLG))

            ;

    }

    /* clear a possible interrupt */

    DMA(instance)->CINT = 1;

    /* stop DMA */

    DMA(instance)->SP_DMA = 1;

    /* restore the CONTROL bits (minus the direction flag) */

    DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;

    /* copy from a bounce buffer, if necessary */

    if (status && HDATA(instance)->dma_bounce_buffer) {

        if (SCpnt && SCpnt->use_sg) {

#if 0

            panic ("scsi%d: incomplete s/g support",

                   instance->host_no);

#else

            if( HDATA(instance)->dma_dir )

                memcpy (SCpnt->SCp.ptr,

                        HDATA(instance)->dma_bounce_buffer,

                        SCpnt->SCp.this_residual);

            scsi_free (HDATA(instance)->dma_bounce_buffer,

                       HDATA(instance)->dma_bounce_len);

            HDATA(instance)->dma_bounce_buffer = NULL;

            HDATA(instance)->dma_bounce_len = 0;

#endif

        } else {

            if (HDATA(instance)->dma_dir && SCpnt)

                memcpy (SCpnt->request_buffer,

                        HDATA(instance)->dma_bounce_buffer,

                        SCpnt->request_bufflen);

            scsi_free (HDATA(instance)->dma_bounce_buffer,

                       HDATA(instance)->dma_bounce_len);

            HDATA(instance)->dma_bounce_buffer = NULL;

            HDATA(instance)->dma_bounce_len = 0;

        }

    }

}

static int num_a2091 = 0;

int __init a2091_detect(Scsi_Host_Template *tpnt)

{

    static unsigned char called = 0;

    struct Scsi_Host *instance;

    unsigned long address;

    struct zorro_dev *z = NULL;

    wd33c93_regs regs;

    if (!MACH_IS_AMIGA || called)

        return 0;

    called = 1;

    tpnt->proc_name = "A2091";

    tpnt->proc_info = &wd33c93_proc_info;

    while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {

        if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&

            z->id != ZORRO_PROD_CBM_A590_A2091_2)

            continue;

        address = z->resource.start;

        if (!request_mem_region(address, 256, "wd33c93"))

            continue;

        instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));

        if (instance == NULL) {

            release_mem_region(address, 256);

            continue;

        }

        instance->base = ZTWO_VADDR(address);

        instance->irq = IRQ_AMIGA_PORTS;

        instance->unique_id = z->slotaddr;

        DMA(instance)->DAWR = DAWR_A2091;

        regs.SASR = &(DMA(instance)->SASR);

        regs.SCMD = &(DMA(instance)->SCMD);

        wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);

        if (num_a2091++ == 0) {

            first_instance = instance;

            a2091_template = instance->hostt;

            request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI",

                        a2091_intr);

        }

        DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;

    }

    return num_a2091;

}

#define HOSTS_C

static Scsi_Host_Template driver_template = A2091_SCSI;

#include "scsi_module.c"

int a2091_release(struct Scsi_Host *instance)

{

#ifdef MODULE

        DMA(instance)->CNTR = 0;

        release_mem_region(ZTWO_PADDR(instance->base), 256);

        if (--num_a2091 == 0)

                free_irq(IRQ_AMIGA_PORTS, a2091_intr);

        wd33c93_release();

#endif

        return 1;

}

MODULE_LICENSE("GPL");