rx.c

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/*
 *	Adaptec AAC series RAID controller driver
 *	(c) Copyright 2001 Red Hat Inc.	<[e-mail]>
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000-2007 Adaptec, Inc. ([e-mail])
 *
 * 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:
 *  rx.c
 *
 * Abstract: Hardware miniport for Drawbridge specific hardware functions.
 *
 */

#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 <asm/semaphore.h>

#include <scsi/scsi_host.h>

#include "aacraid.h"

static irqreturn_t aac_rx_intr_producer(int irq, void *dev_id)
{
	struct aac_dev *dev = dev_id;
	unsigned long bellbits;
	u8 intstat = rx_readb(dev, MUnit.OISR);

	/*
	 *	Read mask and invert because drawbridge is reversed.
	 *	This allows us to only service interrupts that have
	 *	been enabled.
	 *	Check to see if this is our interrupt.  If it isn't just return
	 */
	if (likely(intstat & ~(dev->OIMR))) {
		bellbits = rx_readl(dev, OutboundDoorbellReg);
		if (unlikely(bellbits & DoorBellPrintfReady)) {
			aac_printf(dev, readl (&dev->IndexRegs->Mailbox[5]));
			rx_writel(dev, MUnit.ODR,DoorBellPrintfReady);
			rx_writel(dev, InboundDoorbellReg,DoorBellPrintfDone);
		}
		else if (unlikely(bellbits & DoorBellAdapterNormCmdReady)) {
			rx_writel(dev, MUnit.ODR, DoorBellAdapterNormCmdReady);
			aac_command_normal(&dev->queues->queue[HostNormCmdQueue]);
		}
		else if (likely(bellbits & DoorBellAdapterNormRespReady)) {
			rx_writel(dev, MUnit.ODR,DoorBellAdapterNormRespReady);
			aac_response_normal(&dev->queues->queue[HostNormRespQueue]);
		}
		else if (unlikely(bellbits & DoorBellAdapterNormCmdNotFull)) {
			rx_writel(dev, MUnit.ODR, DoorBellAdapterNormCmdNotFull);
		}
		else if (unlikely(bellbits & DoorBellAdapterNormRespNotFull)) {
			rx_writel(dev, MUnit.ODR, DoorBellAdapterNormCmdNotFull);
			rx_writel(dev, MUnit.ODR, DoorBellAdapterNormRespNotFull);
		}
		return IRQ_HANDLED;
	}
	return IRQ_NONE;
}

static irqreturn_t aac_rx_intr_message(int irq, void *dev_id)
{
	struct aac_dev *dev = dev_id;
	u32 Index = rx_readl(dev, MUnit.OutboundQueue);
	if (unlikely(Index == 0xFFFFFFFFL))
		Index = rx_readl(dev, MUnit.OutboundQueue);
	if (likely(Index != 0xFFFFFFFFL)) {
		do {
			if (unlikely(aac_intr_normal(dev, Index))) {
				rx_writel(dev, MUnit.OutboundQueue, Index);
				rx_writel(dev, MUnit.ODR, DoorBellAdapterNormRespReady);
			}
			Index = rx_readl(dev, MUnit.OutboundQueue);
		} while (Index != 0xFFFFFFFFL);
		return IRQ_HANDLED;
	}
	return IRQ_NONE;
}

/**
 *	aac_rx_disable_interrupt	-	Disable interrupts
 *	@dev: Adapter
 */

static void aac_rx_disable_interrupt(struct aac_dev *dev)
{
	rx_writeb(dev, MUnit.OIMR, dev->OIMR = 0xff);
}

/**
 *	aac_rx_enable_interrupt_producer	-	Enable interrupts
 *	@dev: Adapter
 */

static void aac_rx_enable_interrupt_producer(struct aac_dev *dev)
{
	rx_writeb(dev, MUnit.OIMR, dev->OIMR = 0xfb);
}

/**
 *	aac_rx_enable_interrupt_message	-	Enable interrupts
 *	@dev: Adapter
 */

static void aac_rx_enable_interrupt_message(struct aac_dev *dev)
{
	rx_writeb(dev, MUnit.OIMR, dev->OIMR = 0xf7);
}

/**
 *	rx_sync_cmd	-	send a command and wait
 *	@dev: Adapter
 *	@command: Command to execute
 *	@p1: first parameter
 *	@ret: adapter status
 *
 *	This routine will send a synchronous command to the adapter and wait 
 *	for its	completion.
 */

static int rx_sync_cmd(struct aac_dev *dev, u32 command,
	u32 p1, u32 p2, u32 p3, u32 p4, u32 p5, u32 p6,
	u32 *status, u32 * r1, u32 * r2, u32 * r3, u32 * r4)
{
	unsigned long start;
	int ok;
	/*
	 *	Write the command into Mailbox 0
	 */
	writel(command, &dev->IndexRegs->Mailbox[0]);
	/*
	 *	Write the parameters into Mailboxes 1 - 6
	 */
	writel(p1, &dev->IndexRegs->Mailbox[1]);
	writel(p2, &dev->IndexRegs->Mailbox[2]);
	writel(p3, &dev->IndexRegs->Mailbox[3]);
	writel(p4, &dev->IndexRegs->Mailbox[4]);
	/*
	 *	Clear the synch command doorbell to start on a clean slate.
	 */
	rx_writel(dev, OutboundDoorbellReg, OUTBOUNDDOORBELL_0);
	/*
	 *	Disable doorbell interrupts
	 */
	rx_writeb(dev, MUnit.OIMR, dev->OIMR = 0xff);
	/*
	 *	Force the completion of the mask register write before issuing
	 *	the interrupt.
	 */
	rx_readb (dev, MUnit.OIMR);
	/*
	 *	Signal that there is a new synch command
	 */
	rx_writel(dev, InboundDoorbellReg, INBOUNDDOORBELL_0);

	ok = 0;
	start = jiffies;

	/*
	 *	Wait up to 30 seconds
	 */
	while (time_before(jiffies, start+30*HZ)) 
	{
		udelay(5);	/* Delay 5 microseconds to let Mon960 get info. */
		/*
		 *	Mon960 will set doorbell0 bit when it has completed the command.
		 */
		if (rx_readl(dev, OutboundDoorbellReg) & OUTBOUNDDOORBELL_0) {
			/*
			 *	Clear the doorbell.
			 */
			rx_writel(dev, OutboundDoorbellReg, OUTBOUNDDOORBELL_0);
			ok = 1;
			break;
		}
		/*
		 *	Yield the processor in case we are slow 
		 */
		msleep(1);
	}
	if (unlikely(ok != 1)) {
		/*
		 *	Restore interrupt mask even though we timed out
		 */
		aac_adapter_enable_int(dev);
		return -ETIMEDOUT;
	}
	/*
	 *	Pull the synch status from Mailbox 0.
	 */
	if (status)
		*status = readl(&dev->IndexRegs->Mailbox[0]);
	if (r1)
		*r1 = readl(&dev->IndexRegs->Mailbox[1]);
	if (r2)
		*r2 = readl(&dev->IndexRegs->Mailbox[2]);
	if (r3)
		*r3 = readl(&dev->IndexRegs->Mailbox[3]);
	if (r4)
		*r4 = readl(&dev->IndexRegs->Mailbox[4]);
	/*
	 *	Clear the synch command doorbell.
	 */
	rx_writel(dev, OutboundDoorbellReg, OUTBOUNDDOORBELL_0);
	/*
	 *	Restore interrupt mask
	 */
	aac_adapter_enable_int(dev);
	return 0;

}

/**
 *	aac_rx_interrupt_adapter	-	interrupt adapter
 *	@dev: Adapter
 *
 *	Send an interrupt to the i960 and breakpoint it.
 */

static void aac_rx_interrupt_adapter(struct aac_dev *dev)
{
	rx_sync_cmd(dev, BREAKPOINT_REQUEST, 0, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL);
}

/**
 *	aac_rx_notify_adapter		-	send an event to the adapter
 *	@dev: Adapter
 *	@event: Event to send
 *
 *	Notify the i960 that something it probably cares about has
 *	happened.
 */

static void aac_rx_notify_adapter(struct aac_dev *dev, u32 event)
{
	switch (event) {

	case AdapNormCmdQue:
		rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_1);
		break;
	case HostNormRespNotFull:
		rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_4);
		break;
	case AdapNormRespQue:
		rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_2);
		break;
	case HostNormCmdNotFull:
		rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_3);
		break;
	case HostShutdown:
		break;
	case FastIo:
		rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_6);
		break;
	case AdapPrintfDone:
		rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_5);
		break;
	default:
		BUG();
		break;
	}
}

/**
 *	aac_rx_start_adapter		-	activate adapter
 *	@dev:	Adapter
 *
 *	Start up processing on an i960 based AAC adapter
 */

static void aac_rx_start_adapter(struct aac_dev *dev)
{
	struct aac_init *init;

	init = dev->init;
	init->HostElapsedSeconds = cpu_to_le32(get_seconds());
	// We can only use a 32 bit address here
	rx_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS, (u32)(ulong)dev->init_pa,
	  0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL);
}

/**
 *	aac_rx_check_health
 *	@dev: device to check if healthy
 *
 *	Will attempt to determine if the specified adapter is alive and
 *	capable of handling requests, returning 0 if alive.
 */
static int aac_rx_check_health(struct aac_dev *dev)
{
	u32 status = rx_readl(dev, MUnit.OMRx[0]);

	/*
	 *	Check to see if the board failed any self tests.
	 */
	if (unlikely(status & SELF_TEST_FAILED))
		return -1;
	/*
	 *	Check to see if the board panic'd.
	 */
	if (unlikely(status & KERNEL_PANIC)) {
		char * buffer;