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

/*
 *	Adaptec AAC series RAID controller driver
 *	(c) Copyright 2001 Red Hat Inc.
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000-2010 Adaptec, Inc.
 *               2010 PMC-Sierra, Inc. (aacraid@pmc-sierra.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:
 *  src.c
 *
 * Abstract: Hardware Device Interface for PMC SRC based controllers
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <linux/time.h>
#include <linux/interrupt.h>
#include <scsi/scsi_host.h>

#include "aacraid.h"

static int aac_src_get_sync_status(struct aac_dev *dev);

static irqreturn_t aac_src_intr_message(int irq, void *dev_id)
{
	struct aac_msix_ctx *ctx;
	struct aac_dev *dev;
	unsigned long bellbits, bellbits_shifted;
	int vector_no;
	int isFastResponse, mode;
	u32 index, handle;

	ctx = (struct aac_msix_ctx *)dev_id;
	dev = ctx->dev;
	vector_no = ctx->vector_no;

	if (dev->msi_enabled) {
		mode = AAC_INT_MODE_MSI;
		if (vector_no == 0) {
			bellbits = src_readl(dev, MUnit.ODR_MSI);
			if (bellbits & 0x40000)
				mode |= AAC_INT_MODE_AIF;
			if (bellbits & 0x1000)
				mode |= AAC_INT_MODE_SYNC;
		}
	} else {
		mode = AAC_INT_MODE_INTX;
		bellbits = src_readl(dev, MUnit.ODR_R);
		if (bellbits & PmDoorBellResponseSent) {
			bellbits = PmDoorBellResponseSent;
			src_writel(dev, MUnit.ODR_C, bellbits);
			src_readl(dev, MUnit.ODR_C);
		} else {
			bellbits_shifted = (bellbits >> SRC_ODR_SHIFT);
			src_writel(dev, MUnit.ODR_C, bellbits);
			src_readl(dev, MUnit.ODR_C);

			if (bellbits_shifted & DoorBellAifPending)
				mode |= AAC_INT_MODE_AIF;
			else if (bellbits_shifted & OUTBOUNDDOORBELL_0)
				mode |= AAC_INT_MODE_SYNC;
		}
	}

	if (mode & AAC_INT_MODE_SYNC) {
		unsigned long sflags;
		struct list_head *entry;
		int send_it = 0;
		extern int aac_sync_mode;

		if (!aac_sync_mode && !dev->msi_enabled) {
			src_writel(dev, MUnit.ODR_C, bellbits);
			src_readl(dev, MUnit.ODR_C);
		}

		if (dev->sync_fib) {
			if (dev->sync_fib->callback)
				dev->sync_fib->callback(dev->sync_fib->callback_data,
					dev->sync_fib);
			spin_lock_irqsave(&dev->sync_fib->event_lock, sflags);
			if (dev->sync_fib->flags & FIB_CONTEXT_FLAG_WAIT) {
				dev->management_fib_count--;
				up(&dev->sync_fib->event_wait);
			}
			spin_unlock_irqrestore(&dev->sync_fib->event_lock,
						sflags);
			spin_lock_irqsave(&dev->sync_lock, sflags);
			if (!list_empty(&dev->sync_fib_list)) {
				entry = dev->sync_fib_list.next;
				dev->sync_fib = list_entry(entry,
							   struct fib,
							   fiblink);
				list_del(entry);
				send_it = 1;
			} else {
				dev->sync_fib = NULL;
			}
			spin_unlock_irqrestore(&dev->sync_lock, sflags);
			if (send_it) {
				aac_adapter_sync_cmd(dev, SEND_SYNCHRONOUS_FIB,
					(u32)dev->sync_fib->hw_fib_pa,
					0, 0, 0, 0, 0,
					NULL, NULL, NULL, NULL, NULL);
			}
		}
		if (!dev->msi_enabled)
			mode = 0;

	}

	if (mode & AAC_INT_MODE_AIF) {
		/* handle AIF */
		if (dev->aif_thread && dev->fsa_dev)
			aac_intr_normal(dev, 0, 2, 0, NULL);
		if (dev->msi_enabled)
			aac_src_access_devreg(dev, AAC_CLEAR_AIF_BIT);
		mode = 0;
	}

	if (mode) {
		index = dev->host_rrq_idx[vector_no];

		for (;;) {
			isFastResponse = 0;
			/* remove toggle bit (31) */
			handle = (dev->host_rrq[index] & 0x7fffffff);
			/* check fast response bit (30) */
			if (handle & 0x40000000)
				isFastResponse = 1;
			handle &= 0x0000ffff;
			if (handle == 0)
				break;
			if (dev->msi_enabled && dev->max_msix > 1)
				atomic_dec(&dev->rrq_outstanding[vector_no]);
			dev->host_rrq[index++] = 0;
			aac_intr_normal(dev, handle-1, 0, isFastResponse, NULL);
			if (index == (vector_no + 1) * dev->vector_cap)
				index = vector_no * dev->vector_cap;
			dev->host_rrq_idx[vector_no] = index;
		}
		mode = 0;