/*
   * sim710.c - Copyright (C) 1999 Richard Hirst <richard@sleepie.demon.co.uk>
   *
   *----------------------------------------------------------------------------
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by 
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   *----------------------------------------------------------------------------
   *

   * MCA card detection code by Trent McNair. (now deleted)

   * Fixes to not explicitly nul bss data from Xavier Bestel.
   * Some multiboard fixes from Rolf Eike Beer.
   * Auto probing of EISA config space from Trevor Hemsley.
   *
   * Rewritten to use 53c700.c by James.Bottomley@SteelEye.com
   *
   */

  #include <linux/module.h>

  #include <linux/slab.h>

  
  #include <linux/blkdev.h>
  #include <linux/device.h>
  #include <linux/init.h>

  #include <linux/eisa.h>
  #include <linux/interrupt.h>
  #include <scsi/scsi_host.h>
  #include <scsi/scsi_device.h>
  #include <scsi/scsi_transport.h>
  #include <scsi/scsi_transport_spi.h>
  
  #include "53c700.h"

  /* Must be enough for EISA */

  #define MAX_SLOTS 8
  static __u8 __initdata id_array[MAX_SLOTS] = { [0 ... MAX_SLOTS-1] = 7 };
  
  static char *sim710;		/* command line passed by insmod */
  
  MODULE_AUTHOR("Richard Hirst");
  MODULE_DESCRIPTION("Simple NCR53C710 driver");
  MODULE_LICENSE("GPL");
  
  module_param(sim710, charp, 0);
  
  #ifdef MODULE
  #define ARG_SEP ' '
  #else
  #define ARG_SEP ','
  #endif
  
  static __init int
  param_setup(char *str)
  {
  	char *pos = str, *next;
  	int slot = -1;
  
  	while(pos != NULL && (next = strchr(pos, ':')) != NULL) {
  		int val = (int)simple_strtoul(++next, NULL, 0);
  
  		if(!strncmp(pos, "slot:", 5))
  			slot = val;
  		else if(!strncmp(pos, "id:", 3)) {
  			if(slot == -1) {
  				printk(KERN_WARNING "sim710: Must specify slot for id parameter
  ");

  			} else if(slot >= MAX_SLOTS) {

  				printk(KERN_WARNING "sim710: Illegal slot %d for id %d
  ", slot, val);
  			} else {
  				id_array[slot] = val;
  			}
  		}
  		if((pos = strchr(pos, ARG_SEP)) != NULL)
  			pos++;
  	}
  	return 1;
  }
  __setup("sim710=", param_setup);
  
  static struct scsi_host_template sim710_driver_template = {

  	.name			= "LSI (Symbios) 710 EISA",

  	.proc_name		= "sim710",
  	.this_id		= 7,
  	.module			= THIS_MODULE,
  };

  static int sim710_probe_common(struct device *dev, unsigned long base_addr,
  			       int irq, int clock, int differential,
  			       int scsi_id)

  {
  	struct Scsi_Host * host = NULL;
  	struct NCR_700_Host_Parameters *hostdata =

  		kzalloc(sizeof(struct NCR_700_Host_Parameters),	GFP_KERNEL);

  	printk(KERN_NOTICE "sim710: %s
  ", dev_name(dev));

  	printk(KERN_NOTICE "sim710: irq = %d, clock = %d, base = 0x%lx, scsi_id = %d
  ",
  	       irq, clock, base_addr, scsi_id);
  
  	if(hostdata == NULL) {
  		printk(KERN_ERR "sim710: Failed to allocate host data
  ");
  		goto out;
  	}

  
  	if(request_region(base_addr, 64, "sim710") == NULL) {
  		printk(KERN_ERR "sim710: Failed to reserve IO region 0x%lx
  ",
  		       base_addr);
  		goto out_free;
  	}
  
  	/* Fill in the three required pieces of hostdata */

  	hostdata->base = ioport_map(base_addr, 64);

  	hostdata->differential = differential;
  	hostdata->clock = clock;
  	hostdata->chip710 = 1;

  	hostdata->burst_length = 8;

  
  	/* and register the chip */
  	if((host = NCR_700_detect(&sim710_driver_template, hostdata, dev))
  	   == NULL) {
  		printk(KERN_ERR "sim710: No host detected; card configuration problem?
  ");
  		goto out_release;
  	}
  	host->this_id = scsi_id;

  	host->base = base_addr;

  	host->irq = irq;

  	if (request_irq(irq, NCR_700_intr, IRQF_SHARED, "sim710", host)) {

  		printk(KERN_ERR "sim710: request_irq failed
  ");
  		goto out_put_host;
  	}

  	dev_set_drvdata(dev, host);

  	scsi_scan_host(host);
  
  	return 0;
  
   out_put_host:
  	scsi_host_put(host);
   out_release:

  	release_region(base_addr, 64);

   out_free:
  	kfree(hostdata);
   out:
  	return -ENODEV;
  }

  static int sim710_device_remove(struct device *dev)

  {

  	struct Scsi_Host *host = dev_get_drvdata(dev);

  	struct NCR_700_Host_Parameters *hostdata =
  		(struct NCR_700_Host_Parameters *)host->hostdata[0];
  
  	scsi_remove_host(host);
  	NCR_700_release(host);
  	kfree(hostdata);
  	free_irq(host->irq, host);

  	release_region(host->base, 64);

  	return 0;
  }

  #ifdef CONFIG_EISA
  static struct eisa_device_id sim710_eisa_ids[] = {
  	{ "CPQ4410" },
  	{ "CPQ4411" },
  	{ "HWP0C80" },
  	{ "" }
  };

  MODULE_DEVICE_TABLE(eisa, sim710_eisa_ids);

  
  static __init int
  sim710_eisa_probe(struct device *dev)
  {
  	struct eisa_device *edev = to_eisa_device(dev);
  	unsigned long io_addr = edev->base_addr;
  	char eisa_cpq_irqs[] = { 11, 14, 15, 10, 9, 0 };
  	char eisa_hwp_irqs[] = { 3, 4, 5, 7, 12, 10, 11, 0};
  	char *eisa_irqs;
  	unsigned char irq_index;
  	unsigned char irq, differential = 0, scsi_id = 7;
  
  	if(strcmp(edev->id.sig, "HWP0C80") == 0) {
  		__u8 val;
  		eisa_irqs =  eisa_hwp_irqs;
  		irq_index = (inb(io_addr + 0xc85) & 0x7) - 1;
  
  		val = inb(io_addr + 0x4);
  		scsi_id = ffs(val) - 1;
  
  		if(scsi_id > 7 || (val & ~(1<<scsi_id)) != 0) {

  			printk(KERN_ERR "sim710.c, EISA card %s has incorrect scsi_id, setting to 7
  ", dev_name(dev));

  			scsi_id = 7;
  		}
  	} else {
  		eisa_irqs = eisa_cpq_irqs;
  		irq_index = inb(io_addr + 0xc88) & 0x07;
  	}
  
  	if(irq_index >= strlen(eisa_irqs)) {
  		printk("sim710.c: irq nasty
  ");
  		return -ENODEV;
  	}
  
  	irq = eisa_irqs[irq_index];
  		
  	return sim710_probe_common(dev, io_addr, irq, 50,
  				   differential, scsi_id);
  }
  
  static struct eisa_driver sim710_eisa_driver = {
  	.id_table		= sim710_eisa_ids,
  	.driver = {
  		.name		= "sim710",
  		.probe		= sim710_eisa_probe,

  		.remove		= sim710_device_remove,

  	},
  };
  #endif /* CONFIG_EISA */
  
  static int __init sim710_init(void)
  {
  	int err = -ENODEV;
  
  #ifdef MODULE
  	if (sim710)
  		param_setup(sim710);
  #endif

  #ifdef CONFIG_EISA
  	err = eisa_driver_register(&sim710_eisa_driver);
  #endif
  	/* FIXME: what we'd really like to return here is -ENODEV if
  	 * no devices have actually been found.  Instead, the err
  	 * above actually only reports problems with kobject_register,
  	 * so for the moment return success */
  
  	return 0;
  }
  
  static void __exit sim710_exit(void)
  {

  #ifdef CONFIG_EISA
  	eisa_driver_unregister(&sim710_eisa_driver);
  #endif
  }
  
  module_init(sim710_init);
  module_exit(sim710_exit);