path: root/drivers/scsi/eata_pio.c

/************************************************************
 *                                                          *
 *               Linux EATA SCSI PIO driver                 *
 *                                                          *
 *  based on the CAM document CAM/89-004 rev. 2.0c,         *
 *  DPT's driver kit, some internal documents and source,   *
 *  and several other Linux scsi drivers and kernel docs.   *
 *                                                          *
 *  The driver currently:                                   *
 *      -supports all EATA-PIO boards                       *
 *      -only supports DASD devices                         *
 *                                                          *
 *  (c)1993-96 Michael Neuffer, Alfred Arnold               *
 *             neuffer@goofy.zdv.uni-mainz.de               *
 *             a.arnold@kfa-juelich.de                      * 
 *                                                          *
 *  Updated 2002 by Alan Cox <alan@lxorguk.ukuu.org.uk> for *
 *   Linux 2.5.x and the newer locking and error handling   *
 *                                                          *
 *  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 kernel; if not, write to *
 *  the Free Software Foundation, Inc., 675 Mass Ave,       *
 *  Cambridge, MA 02139, USA.                               *
 *							    *
 *  For the avoidance of doubt the "preferred form" of this *
 *  code is one which is in an open non patent encumbered   *
 *  format. Where cryptographic key signing forms part of   *
 *  the process of creating an executable the information   *
 *  including keys needed to generate an equivalently       *
 *  functional executable are deemed to be part of the 	    *
 *  source code are deemed to be part of the source code.   *
 *                                                          *
 ************************************************************
 *  last change: 2002/11/02               OS: Linux 2.5.45  *
 ************************************************************/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/delay.h>

#include <asm/io.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>

#include "eata_generic.h"
#include "eata_pio.h"


static unsigned int ISAbases[MAXISA] =	{
	 0x1F0, 0x170, 0x330, 0x230
};

static unsigned int ISAirqs[MAXISA] = {
	14, 12, 15, 11
};

static unsigned char EISAbases[] = { 
	1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1 
};

static unsigned int registered_HBAs;
static struct Scsi_Host *last_HBA;
static struct Scsi_Host *first_HBA;
static unsigned char reg_IRQ[16];
static unsigned char reg_IRQL[16];
static unsigned long int_counter;
static unsigned long queue_counter;

static struct scsi_host_template driver_template;

static int eata_pio_show_info(struct seq_file *m, struct Scsi_Host *shost)
{
	seq_printf(m, "EATA (Extended Attachment) PIO driver version: "
		   "%d.%d%s\n",VER_MAJOR, VER_MINOR, VER_SUB);
	seq_printf(m, "queued commands:     %10ld\n"
		   "processed interrupts:%10ld\n", queue_counter, int_counter);
	seq_printf(m, "\nscsi%-2d: HBA %.10s\n",
		   shost->host_no, SD(shost)->name);
	seq_printf(m, "Firmware revision: v%s\n",
		   SD(shost)->revision);
	seq_printf(m, "IO: PIO\n");
	seq_printf(m, "Base IO : %#.4x\n", (u32) shost->base);
	seq_printf(m, "Host Bus: %s\n",
		   (SD(shost)->bustype == 'P')?"PCI ":
		   (SD(shost)->bustype == 'E')?"EISA":"ISA ");
	return 0;
}

static int eata_pio_release(struct Scsi_Host *sh)
{
	hostdata *hd = SD(sh);
	if (sh->irq && reg_IRQ[sh->irq] == 1)
		free_irq(sh->irq, NULL);
	else
		reg_IRQ[sh->irq]--;
	if (SD(sh)->channel == 0) {
		if (sh->io_port && sh->n_io_port)
			release_region(sh->io_port, sh->n_io_port);
	}
	/* At this point the PCI reference can go */
	if (hd->pdev)
		pci_dev_put(hd->pdev);
	return 1;
}

static void IncStat(struct scsi_pointer *SCp, unsigned int Increment)
{
	SCp->ptr += Increment;
	if ((SCp->this_residual -= Increment) == 0) {
		if ((--SCp->buffers_residual) == 0)
			SCp->Status = 0;
		else {
			SCp->buffer++;
			SCp->ptr = sg_virt(SCp->buffer);
			SCp->this_residual = SCp->buffer->length;
		}
	}
}

static irqreturn_t eata_pio_int_handler(int irq, void *dev_id);

static irqreturn_t do_eata_pio_int_handler(int irq, void *dev_id)
{
	unsigned long flags;
	struct Scsi_Host *dev = dev_id;
	irqreturn_t ret;

	spin_lock_irqsave(dev->host_lock, flags);
	ret = eata_pio_int_handler(irq, dev_id);
	spin_unlock_irqrestore(dev->host_lock