#include <linux/types.h>
  #include <linux/mm.h>
  #include <linux/blkdev.h>

  #include <linux/interrupt.h>
  
  #include <asm/page.h>
  #include <asm/pgtable.h>
  #include <asm/mvme147hw.h>
  #include <asm/irq.h>
  
  #include "scsi.h"
  #include <scsi/scsi_host.h>
  #include "wd33c93.h"
  #include "mvme147.h"

  #include <linux/stat.h>

  static irqreturn_t mvme147_intr(int irq, void *data)

  {

  	struct Scsi_Host *instance = data;

  	if (irq == MVME147_IRQ_SCSI_PORT)

  		wd33c93_intr(instance);

  	else
  		m147_pcc->dma_intr = 0x89;	/* Ack and enable ints */
  	return IRQ_HANDLED;

  }

  static int dma_setup(struct scsi_cmnd *cmd, int dir_in)

  {

  	struct Scsi_Host *instance = cmd->device->host;
  	struct WD33C93_hostdata *hdata = shost_priv(instance);

  	unsigned char flags = 0x01;
  	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  
  	/* setup dma direction */
  	if (!dir_in)
  		flags |= 0x04;
  
  	/* remember direction */

  	hdata->dma_dir = dir_in;

  
  	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 */
  	m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24);
  	m147_pcc->dma_dadr = addr;
  	m147_pcc->dma_cntrl = flags;
  
  	/* return success */
  	return 0;

  }

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

  		     int status)

  {

  	m147_pcc->dma_cntrl = 0;

  }

  int mvme147_detect(struct scsi_host_template *tpnt)

  {

  	static unsigned char called = 0;

  	struct Scsi_Host *instance;

  	wd33c93_regs regs;

  	struct WD33C93_hostdata *hdata;

  
  	if (!MACH_IS_MVME147 || called)
  		return 0;
  	called++;
  
  	tpnt->proc_name = "MVME147";

  	tpnt->show_info = wd33c93_show_info,
  	tpnt->write_info = wd33c93_write_info,

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

  		goto err_out;

  	instance->base = 0xfffe4000;
  	instance->irq = MVME147_IRQ_SCSI_PORT;

  	regs.SASR = (volatile unsigned char *)0xfffe4000;
  	regs.SCMD = (volatile unsigned char *)0xfffe4001;

  	hdata = shost_priv(instance);

  	hdata->no_sync = 0xff;
  	hdata->fast = 0;
  	hdata->dma_mode = CTRL_DMA;

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

  
  	if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,

  			"MVME147 SCSI PORT", instance))

  		goto err_unregister;
  	if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,

  			"MVME147 SCSI DMA", instance))

  		goto err_free_irq;

  #if 0	/* Disabled; causes problems booting */

  	m147_pcc->scsi_interrupt = 0x10;	/* Assert SCSI bus reset */
  	udelay(100);
  	m147_pcc->scsi_interrupt = 0x00;	/* Negate SCSI bus reset */
  	udelay(2000);
  	m147_pcc->scsi_interrupt = 0x40;	/* Clear bus reset interrupt */

  #endif

  	m147_pcc->scsi_interrupt = 0x09;	/* Enable interrupt */

  	m147_pcc->dma_cntrl = 0x00;	/* ensure DMA is stopped */
  	m147_pcc->dma_intr = 0x89;	/* Ack and enable ints */

  	return 1;

  err_free_irq:
  	free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
  err_unregister:

  	scsi_unregister(instance);

  err_out:
  	return 0;

  }

  static int mvme147_bus_reset(struct scsi_cmnd *cmd)

  {
  	/* FIXME perform bus-specific reset */

  	/* FIXME 2: kill this function, and let midlayer fallback to

  	   the same result, calling wd33c93_host_reset() */

  	spin_lock_irq(cmd->device->host->host_lock);

  	wd33c93_host_reset(cmd);

  	spin_unlock_irq(cmd->device->host->host_lock);

  	return SUCCESS;
  }

  static struct scsi_host_template driver_template = {

  	.proc_name		= "MVME147",
  	.name			= "MVME147 built-in SCSI",
  	.detect			= mvme147_detect,
  	.release		= mvme147_release,
  	.queuecommand		= wd33c93_queuecommand,
  	.eh_abort_handler	= wd33c93_abort,
  	.eh_bus_reset_handler	= mvme147_bus_reset,
  	.eh_host_reset_handler	= wd33c93_host_reset,
  	.can_queue		= CAN_QUEUE,
  	.this_id		= 7,
  	.sg_tablesize		= SG_ALL,
  	.cmd_per_lun		= CMD_PER_LUN,
  	.use_clustering		= ENABLE_CLUSTERING
  };
  
  
  #include "scsi_module.c"
  
  int mvme147_release(struct Scsi_Host *instance)
  {
  #ifdef MODULE

  	/* XXX Make sure DMA is stopped! */
  	free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
  	free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);

  #endif

  	return 1;

  }