path: root/drivers/scsi/aacraid/commsup.c

/*
 *	Adaptec AAC series RAID controller driver
 *	(c) Copyright 2001 Red Hat Inc.	<alan@redhat.com>
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
 *
 * 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, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Module Name:
 *  commsup.c
 *
 * Abstract: Contain all routines that are required for FSA host/adapter
 *    communication.
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/blkdev.h>
#include <scsi/scsi_host.h>
#include <asm/semaphore.h>

#include "aacraid.h"

/**
 *	fib_map_alloc		-	allocate the fib objects
 *	@dev: Adapter to allocate for
 *
 *	Allocate and map the shared PCI space for the FIB blocks used to
 *	talk to the Adaptec firmware.
 */
 
static int fib_map_alloc(struct aac_dev *dev)
{
	dprintk((KERN_INFO
	  "allocate hardware fibs pci_alloc_consistent(%p, %d * (%d + %d), %p)\n",
	  dev->pdev, dev->max_fib_size, dev->scsi_host_ptr->can_queue,
	  AAC_NUM_MGT_FIB, &dev->hw_fib_pa));
	if((dev->hw_fib_va = pci_alloc_consistent(dev->pdev, dev->max_fib_size
	  * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB),
	  &dev->hw_fib_pa))==NULL)
		return -ENOMEM;
	return 0;
}

/**
 *	fib_map_free		-	free the fib objects
 *	@dev: Adapter to free
 *
 *	Free the PCI mappings and the memory allocated for FIB blocks
 *	on this adapter.
 */

void fib_map_free(struct aac_dev *dev)
{
	pci_free_consistent(dev->pdev, dev->max_fib_size * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB), dev->hw_fib_va, dev->hw_fib_pa);
}

/**
 *	fib_setup	-	setup the fibs
 *	@dev: Adapter to set up
 *
 *	Allocate the PCI space for the fibs, map it and then intialise the
 *	fib area, the unmapped fib data and also the free list
 */

int fib_setup(struct aac_dev * dev)
{
	struct fib *fibptr;
	struct hw_fib *hw_fib_va;
	dma_addr_t hw_fib_pa;
	int i;

	while (((i = fib_map_alloc(dev)) == -ENOMEM)
	 && (dev->scsi_host_ptr->can_queue > (64 - AAC_NUM_MGT_FIB))) {
		dev->init->MaxIoCommands = cpu_to_le32((dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB) >> 1);
		dev->scsi_host_ptr->can_queue = le32_to_cpu(dev->init->MaxIoCommands) - AAC_NUM_MGT_FIB;
	}
	if (i<0)
		return -ENOMEM;
		
	hw_fib_va = dev->hw_fib_va;
	hw_fib_pa = dev->hw_fib_pa;
	memset(hw_fib_va, 0, dev->max_fib_size * (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB));
	/*
	 *	Initialise the fibs
	 */
	for (i = 0, fibptr = &dev->fibs[i]; i < (dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB); i++, fibptr++) 
	{
		fibptr->dev = dev;
		fibptr->hw_fib = hw_fib_va;
		fibptr->data = (void *) fibptr->hw_fib->data;
		fibptr->next = fibptr+1;	/* Forward chain the fibs */
		init_MUTEX_LOCKED(&fibptr->event_wait);
		spin_lock_init(&fibptr->event_lock);
		hw_fib_va->header.XferState = cpu_to_le32(0xffffffff);
		hw_fib_va->header.SenderSize = cpu_to_le16(dev->max_fib_size);
		fibptr->hw_fib_pa = hw_fib_pa;
		hw_fib_va = (struct hw_fib *)((unsigned char *)hw_fib_va + dev->max_fib_size);
		hw_fib_pa = hw_fib_pa + dev->max_fib_size;
	}
	/*
	 *	Add the fib chain to the free list
	 */
	dev->fibs[dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB - 1].next = NULL;
	/*
	 *	Enable this to debug out of queue space
	 */
	dev->free_fib = &dev->fibs[0];
	return 0;
}

/**
 *	fib_alloc	-	allocate a fib
 *	@dev: Adapter to allocate the fib for
 *
 *	Allocate a fib from the adapter fib pool. If the pool is empty we
 *	return NULL.
 */
 
struct fib * fib_alloc(struct aac_dev *dev)
{
	struct fib * fibptr;
	unsigned long flags;
	spin_lock_irqsave(&dev->fib_lock, flags);
	fibptr = dev->free_fib;	
	if(!fibptr){
		spin_unlock_irqrestore(&dev->fib_lock, flags);
		return fibptr;
	}
	dev->free_fib = fibptr->next;
	spin_unlock_irqrestore(&dev->fib_lock, flags);
	/*
	 *	Set the proper node type code and node byte size
	 */
	fibptr->type = FSAFS_NTC_FIB_CONTEXT;
	fibptr->size = sizeof(struct fib);
	/*
	 *	Null out fields that depend on being zero at the start of
	 *	each I/O
	 */
	fibptr->hw_fib->header