#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blk.h>
#include <linux/version.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <asm/irq.h>

#include "scsi.h"
#include "hosts.h"
#include "wd33c93.h"
#include "a3000.h"

#include<linux/stat.h>

struct proc_dir_entry proc_scsi_a3000 = {
    PROC_SCSI_A3000, 5, "A3000",
    S_IFDIR | S_IRUGO | S_IXUGO, 2
};

#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))

static struct Scsi_Host *a3000_host = NULL;

static void a3000_intr (int irq, struct pt_regs *fp, void *dummy)
{
    unsigned int status = DMA(a3000_host)->ISTR;

    if (!(status & ISTR_INT_P))
	return;

    if (status & ISTR_INTS)
    {
	/* disable PORTS interrupt */
	custom.intena = IF_PORTS;
	wd33c93_intr (a3000_host);
	/* enable PORTS interrupt */
	custom.intena = IF_SETCLR | IF_PORTS;
    } else {
      printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
    }
}

static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
{
    unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
    unsigned long addr = VTOP(cmd->SCp.ptr);

    /*
     * if the physical address has the wrong alignment, or if
     * physical address is bad, or if it is a write and at the
     * end of a physical memory chunk, then allocate a bounce
     * buffer
     */
    if (addr & A3000_XFER_MASK ||
	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
    {
	HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
	    & ~0x1ff;
	HDATA(a3000_host)->dma_bounce_buffer =
	    scsi_malloc (HDATA(a3000_host)->dma_bounce_len);
	
	/* can't allocate memory; use PIO */
	if (!HDATA(a3000_host)->dma_bounce_buffer) {
	    HDATA(a3000_host)->dma_bounce_len = 0;
	    return 1;
	}

	if (!dir_in) {
	    /* copy to bounce buffer for a write */
	    if (cmd->use_sg) {
		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
			cmd->SCp.ptr, cmd->SCp.this_residual);
	    } else
		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
			cmd->request_buffer, cmd->request_bufflen);
	}

	addr = VTOP(HDATA(a3000_host)->dma_bounce_buffer);
    }

    /* setup dma direction */
    if (!dir_in)
	cntr |= CNTR_DDIR;

    /* remember direction */
    HDATA(a3000_host)->dma_dir = dir_in;

    DMA(a3000_host)->CNTR = cntr;

    /* setup DMA *physical* address */
    DMA(a3000_host)->ACR = addr;


    if (dir_in)
      {
  	/* invalidate any cache */
        /*
         * On the 68040 it's not ok to use cache_clear, as it just invalidates
         * cache-lines, and thereby trashing them. We need to use cache_push
         * to avoid problems/crashes.
         * This was a real bitch to catch :-( -Jes
         */

        if (boot_info.cputype & CPU_68040)
	  cache_push (addr, cmd->SCp.this_residual);
	else
	  cache_clear (addr, cmd->SCp.this_residual);
      }
    else
      /* push any dirty cache */
      cache_push (addr, cmd->SCp.this_residual);
      

    /* start DMA */
    DMA(a3000_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;

    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 */
    /* I think that this CINT is only necessary if you are
     * using the terminal count features.   HM 7 Mar 1994
     */
    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 (HDATA(instance)->dma_dir && SCpnt)
		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;
	} 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;
	}
    }
}

int a3000_detect(Scsi_Host_Template *tpnt)
{
    static unsigned char called = 0;

    if (called)
	return 0;

    if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
	return 0;

    tpnt->proc_dir = &proc_scsi_a3000;

    a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
    a3000_host->base = (unsigned char *)ZTWO_VADDR(0xDD0000);
    DMA(a3000_host)->DAWR = DAWR_A3000;
    wd33c93_init(a3000_host, (wd33c93_regs *)&(DMA(a3000_host)->SASR),
		 dma_setup, dma_stop, WD33C93_FS_12_15);
    add_isr(IRQ_AMIGA_PORTS, a3000_intr, 0, NULL, "A3000 SCSI");
    DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
    called = 1;

    return 1;
}