Free Electrons

Embedded Linux Experts

/*
 * Generic Generic NCR5380 driver
 *
 * Copyright 1995-2002, Russell King
 */
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <linux/init.h>

#include <asm/ecard.h>
#include <asm/io.h>

#include <scsi/scsi_host.h>

#include <scsi/scsicam.h>

#define PSEUDO_DMA

#define priv(host)			((struct NCR5380_hostdata *)(host)->hostdata)
#define NCR5380_local_declare()		struct Scsi_Host *_instance
#define NCR5380_setup(instance)		_instance = instance
#define NCR5380_read(reg)		cumanascsi_read(_instance, reg)
#define NCR5380_write(reg, value)	cumanascsi_write(_instance, reg, value)
#define NCR5380_intr			cumanascsi_intr
#define NCR5380_queue_command		cumanascsi_queue_command
#define NCR5380_info			cumanascsi_info

#define NCR5380_implementation_fields	\
	unsigned ctrl;			\
	void __iomem *base;		\
	void __iomem *dma

#include "../NCR5380.h"

void cumanascsi_setup(char *str, int *ints)
{
}

#define CTRL	0x16fc
#define STAT	0x2004
#define L(v)	(((v)<<16)|((v) & 0x0000ffff))
#define H(v)	(((v)>>16)|((v) & 0xffff0000))

static inline int
NCR5380_pwrite(struct Scsi_Host *host, unsigned char *addr, int len)
{
  unsigned long *laddr;
  void __iomem *dma = priv(host)->dma + 0x2000;

  if(!len) return 0;

  writeb(0x02, priv(host)->base + CTRL);
  laddr = (unsigned long *)addr;
  while(len >= 32)
  {
    unsigned int status;
    unsigned long v;
    status = readb(priv(host)->base + STAT);
    if(status & 0x80)
      goto end;
    if(!(status & 0x40))
      continue;
    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
    len -= 32;
    if(len == 0)
      break;
  }

  addr = (unsigned char *)laddr;
  writeb(0x12, priv(host)->base + CTRL);

  while(len > 0)
  {
    unsigned int status;
    status = readb(priv(host)->base + STAT);
    if(status & 0x80)
      goto end;
    if(status & 0x40)
    {
      writeb(*addr++, dma);
      if(--len == 0)
        break;
    }

    status = readb(priv(host)->base + STAT);
    if(status & 0x80)
      goto end;
    if(status & 0x40)
    {
      writeb(*addr++, dma);
      if(--len == 0)
        break;
    }
  }
end:
  writeb(priv(host)->ctrl | 0x40, priv(host)->base + CTRL);
  return len;
}

static inline int
NCR5380_pread(struct Scsi_Host *host, unsigned char *addr, int len)
{
  unsigned long *laddr;
  void __iomem *dma = priv(host)->dma + 0x2000;

  if(!len) return 0;

  writeb(0x00, priv(host)->base + CTRL);
  laddr = (unsigned long *)addr;
  while(len >= 32)
  {
    unsigned int status;
    status = readb(priv(host)->base + STAT);
    if(status & 0x80)
      goto end;
    if(!(status & 0x40))
      continue;
    *laddr++ = readw(dma) | (readw(dma) << 16);
    *laddr++ = readw(dma) | (readw(dma) << 16);
    *laddr++ = readw(dma) | (readw(dma) << 16);
    *laddr++ = readw(dma) | (readw(dma) << 16);
    *laddr++ = readw(dma) | (readw(dma) << 16);
    *laddr++ = readw(dma) | (readw(dma) << 16);
    *laddr++ = readw(dma) | (readw(dma) << 16);
    *laddr++ = readw(dma) | (readw(dma) << 16);
    len -= 32;
    if(len == 0)
      break;
  }

  addr = (unsigned char *)laddr;
  writeb(0x10, priv(host)->base + CTRL);

  while(len > 0)
  {
    unsigned int status;
    status = readb(priv(host)->base + STAT);
    if(status & 0x80)
      goto end;
    if(status & 0x40)
    {
      *addr++ = readb(dma);
      if(--len == 0)
        break;
    }

    status = readb(priv(host)->base + STAT);
    if(status & 0x80)
      goto end;
    if(status & 0x40)
    {
      *addr++ = readb(dma);
      if(--len == 0)
        break;
    }
  }
end:
  writeb(priv(host)->ctrl | 0x40, priv(host)->base + CTRL);
  return len;
}

static unsigned char cumanascsi_read(struct Scsi_Host *host, unsigned int reg)
{
	void __iomem *base = priv(host)->base;
	unsigned char val;

	writeb(0, base + CTRL);

	val = readb(base + 0x2100 + (reg << 2));

	priv(host)->ctrl = 0x40;
	writeb(0x40, base + CTRL);

	return val;
}

static void cumanascsi_write(struct Scsi_Host *host, unsigned int reg, unsigned int value)
{
	void __iomem *base = priv(host)->base;

	writeb(0, base + CTRL);

	writeb(value, base + 0x2100 + (reg << 2));

	priv(host)->ctrl = 0x40;
	writeb(0x40, base + CTRL);
}

#include "../NCR5380.c"

static struct scsi_host_template cumanascsi_template = {
	.module			= THIS_MODULE,
	.name			= "Cumana 16-bit SCSI",
	.info			= cumanascsi_info,
	.queuecommand		= cumanascsi_queue_command,
	.eh_abort_handler	= NCR5380_abort,
	.eh_bus_reset_handler	= NCR5380_bus_reset,
	.can_queue		= 16,
	.this_id		= 7,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= 2,
	.use_clustering		= DISABLE_CLUSTERING,
	.proc_name		= "CumanaSCSI-1",
};

static int cumanascsi1_probe(struct expansion_card *ec,
			     const struct ecard_id *id)
{
	struct Scsi_Host *host;
	int ret;

	ret = ecard_request_resources(ec);
	if (ret)
		goto out;

	host = scsi_host_alloc(&cumanascsi_template, sizeof(struct NCR5380_hostdata));
	if (!host) {
		ret = -ENOMEM;
		goto out_release;
	}

	priv(host)->base = ioremap(ecard_resource_start(ec, ECARD_RES_IOCSLOW),
				   ecard_resource_len(ec, ECARD_RES_IOCSLOW));
	priv(host)->dma = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
				  ecard_resource_len(ec, ECARD_RES_MEMC));
	if (!priv(host)->base || !priv(host)->dma) {
		ret = -ENOMEM;
		goto out_unmap;
	}

	host->irq = ec->irq;

	NCR5380_init(host, 0);

        priv(host)->ctrl = 0;
        writeb(0, priv(host)->base + CTRL);

	host->n_io_port = 255;
	if (!(request_region(host->io_port, host->n_io_port, "CumanaSCSI-1"))) {
		ret = -EBUSY;
		goto out_unmap;
	}

	ret = request_irq(host->irq, cumanascsi_intr, 0,
			  "CumanaSCSI-1", host);
	if (ret) {
		printk("scsi%d: IRQ%d not free: %d\n",
		    host->host_no, host->irq, ret);
		goto out_unmap;
	}

	ret = scsi_add_host(host, &ec->dev);
	if (ret)
		goto out_free_irq;

	scsi_scan_host(host);
	goto out;

 out_free_irq:
	free_irq(host->irq, host);
 out_unmap:
	iounmap(priv(host)->base);
	iounmap(priv(host)->dma);
	scsi_host_put(host);
 out_release:
	ecard_release_resources(ec);
 out:
	return ret;
}

static void cumanascsi1_remove(struct expansion_card *ec)
{
	struct Scsi_Host *host = ecard_get_drvdata(ec);

	ecard_set_drvdata(ec, NULL);

	scsi_remove_host(host);
	free_irq(host->irq, host);
	NCR5380_exit(host);
	iounmap(priv(host)->base);
	iounmap(priv(host)->dma);
	scsi_host_put(host);
	ecard_release_resources(ec);
}

static const struct ecard_id cumanascsi1_cids[] = {
	{ MANU_CUMANA, PROD_CUMANA_SCSI_1 },
	{ 0xffff, 0xffff }
};

static struct ecard_driver cumanascsi1_driver = {
	.probe		= cumanascsi1_probe,
	.remove		= cumanascsi1_remove,
	.id_table	= cumanascsi1_cids,
	.drv = {
		.name		= "cumanascsi1",
	},
};

static int __init cumanascsi_init(void)
{
	return ecard_register_driver(&cumanascsi1_driver);
}

static void __exit cumanascsi_exit(void)
{
	ecard_remove_driver(&cumanascsi1_driver);
}

module_init(cumanascsi_init);
module_exit(cumanascsi_exit);

MODULE_DESCRIPTION("Cumana SCSI-1 driver for Acorn machines");
MODULE_LICENSE("GPL");