/*
 *	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 irqreturn_t aac_src_intr_message(int irq, void *dev_id)
{
	struct aac_dev *dev = dev_id;
	unsigned long bellbits, bellbits_shifted;
	int our_interrupt = 0;
	int isFastResponse;
	u32 index, handle;

	bellbits = src_readl(dev, MUnit.ODR_R);
	if (bellbits & PmDoorBellResponseSent) {
		bellbits = PmDoorBellResponseSent;
		/* handle async. status */
		our_interrupt = 1;
		index = dev->host_rrq_idx;
		if (dev->host_rrq[index] == 0) {
			u32 old_index = index;
			/* adjust index */
			do {
				index++;
				if (index == dev->scsi_host_ptr->can_queue +
							AAC_NUM_MGT_FIB)
					index = 0;
				if (dev->host_rrq[index] != 0)
					break;
			} while (index != old_index);
			dev->host_rrq_idx = index;
		}
		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;

			aac_intr_normal(dev, handle-1, 0, isFastResponse, NULL);

			dev->host_rrq[index++] = 0;
			if (index == dev->scsi_host_ptr->can_queue +
						AAC_NUM_MGT_FIB)
				index = 0;
			dev->host_rrq_idx = index;
		}
	} else {
		bellbits_shifted = (bellbits >> SRC_ODR_SHIFT);
		if (bellbits_shifted & DoorBellAifPending) {
			our_interrupt = 1;
			/* handle AIF */
			aac_intr_normal(dev, 0, 2, 0, NULL);
		}
	}

	if (our_interrupt) {
		src_writel(dev, MUnit.ODR_C, bellbits);
		return IRQ_HANDLED;
	}
	return IRQ_NONE;
}

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

static void aac_src_disable_interrupt(struct aac_dev *dev)
{
	src_writel(dev, MUnit.OIMR, dev->OIMR = 0xffffffff);
}

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

static void aac_src_enable_interrupt_message(struct aac_dev *dev)
{
	src_writel(dev, MUnit.OIMR, dev->OIMR = 0xfffffff8);
}

/**
 *	src_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 src_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.
	 */
	src_writel(dev, MUnit.ODR_C, OUTBOUNDDOORBELL_0 << SRC_ODR_SHIFT);

	/*
	 *	Disable doorbell interrupts
	 */
	src_writel(dev, MUnit.OIMR, dev->OIMR = 0xffffffff);

	/*
	 *	Force the completion of the mask register write before issuing
	 *	the interrupt.
	 */
	src_readl(dev, MUnit.OIMR);

	/*
	 *	Signal that there is a new synch command
	 */
	src_writel(dev, MUnit.IDR, INBOUNDDOORBELL_0 << SRC_IDR_SHIFT);

	ok = 0;
	start = jiffies;

	/*
	 *	Wait up to 30 seconds
	 */
	while (time_before(jiffies, start+30*HZ)) {
		/* Delay 5 microseconds to let Mon960 get info. */
		udelay(5);

		/* Mon960 will set doorbell0 bit
		 * when it has completed the command
		 */
		if ((src_readl(dev, MUnit.ODR_R) >> SRC_ODR_SHIFT) & OUTBOUNDDOORBELL_0) {
			/* Clear the doorbell */
			src_writel(dev,
				MUnit.ODR_C,
				OUTBOUNDDOORBELL_0 << SRC_ODR_SHIFT);
			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 */
	src_writel(dev, MUnit.ODR_C, OUTBOUNDDOORBELL_0 << SRC_ODR_SHIFT);

	 /* Restore interrupt mask */
	aac_adapter_enable_int(dev);
	return 0;

}

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

static void aac_src_interrupt_adapter(struct aac_dev *dev)
{
	src_sync_cmd(dev, BREAKPOINT_REQUEST,
		0, 0, 0, 0, 0, 0,
		NULL, NULL, NULL, NULL, NULL);
}

/**
 *	aac_src_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_src_notify_adapter(struct aac_dev *dev, u32 event)
{
	switch (event) {

	case AdapNormCmdQue:
		src_writel(dev, MUnit.ODR_C,
			INBOUNDDOORBELL_1 << SRC_ODR_SHIFT);
		break;
	case HostNormRespNotFull:
		src_writel(dev, MUnit.ODR_C,
			INBOUNDDOORBELL_4 << SRC_ODR_SHIFT);
		break;
	case AdapNormRespQue:
		src_writel(dev, MUnit.ODR_C,
			INBOUNDDOORBELL_2 << SRC_ODR_SHIFT);
		break;
	case HostNormCmdNotFull:
		src_writel(dev, MUnit.ODR_C,
			INBOUNDDOORBELL_3 << SRC_ODR_SHIFT);
		break;
	case FastIo:
		src_writel(dev, MUnit.ODR_C,
			INBOUNDDOORBELL_6 << SRC_ODR_SHIFT);
		break;
	case AdapPrintfDone:
		src_writel(dev, MUnit.ODR_C,
			INBOUNDDOORBELL_5 << SRC_ODR_SHIFT);
		break;
	default:
		BUG();
		break;
	}
}

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

static void aac_src_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 */
	src_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS, (u32)(ulong)dev->init_pa,
	  0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL);
}

/**
 *	aac_src_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_src_check_health(struct aac_dev *dev)
{
	u32 status = src_readl(dev, MUnit.OMR);

	/*
	 *	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))
		return (status >> 16) & 0xFF;
	/*
	 *	Wait for the adapter to be up and running.
	 */
	if (unlikely(!(status & KERNEL_UP_AND_RUNNING)))
		return -3;
	/*
	 *	Everything is OK
	 */
	return 0;
}

/**
 *	aac_src_deliver_message
 *	@fib: fib to issue
 *
 *	Will send a fib, returning 0 if successful.
 */
static int aac_src_deliver_message(struct fib *fib)
{
	struct aac_dev *dev = fib->dev;
	struct aac_queue *q = &dev->queues->queue[AdapNormCmdQueue];
	unsigned long qflags;
	u32 fibsize;
	u64 address;
	struct aac_fib_xporthdr *pFibX;

	spin_lock_irqsave(q->lock, qflags);
	q->numpending++;
	spin_unlock_irqrestore(q->lock, qflags);

	/* Calculate the amount to the fibsize bits */
	fibsize = (sizeof(struct aac_fib_xporthdr) +
		fib->hw_fib_va->header.Size + 127) / 128 - 1;
	if (fibsize > (ALIGN32 - 1))
		fibsize = ALIGN32 - 1;

    /* Fill XPORT header */
	pFibX = (struct aac_fib_xporthdr *)
		((unsigned char *)fib->hw_fib_va -
		sizeof(struct aac_fib_xporthdr));
	pFibX->Handle = fib->hw_fib_va->header.SenderData + 1;
	pFibX->HostAddress = fib->hw_fib_pa;
	pFibX->Size = fib->hw_fib_va->header.Size;
	address = fib->hw_fib_pa - (u64)sizeof(struct aac_fib_xporthdr);

	src_writel(dev, MUnit.IQ_H, (u32)(address >> 32));
	src_writel(dev, MUnit.IQ_L, (u32)(address & 0xffffffff) + fibsize);
	return 0;
}

/**
 *	aac_src_ioremap
 *	@size: mapping resize request
 *
 */
static int aac_src_ioremap(struct aac_dev *dev, u32 size)
{
	if (!size) {
		iounmap(dev->regs.src.bar0);
		dev->regs.src.bar0 = NULL;
		iounmap(dev->base);
		dev->base = NULL;
		return 0;
	}
	dev->regs.src.bar1 = ioremap(pci_resource_start(dev->pdev, 2),
		AAC_MIN_SRC_BAR1_SIZE);
	dev->base = NULL;
	if (dev->regs.src.bar1 == NULL)
		return -1;
	dev->base = dev->regs.src.bar0 = ioremap(dev->scsi_host_ptr->base,
				size);
	if (dev->base == NULL) {
		iounmap(dev->regs.src.bar1);
		dev->regs.src.bar1 = NULL;
		return -1;
	}
	dev->IndexRegs = &((struct src_registers __iomem *)
		dev->base)->IndexRegs;
	return 0;
}

static int aac_src_restart_adapter(struct aac_dev *dev, int bled)
{
	u32 var, reset_mask;

	if (bled >= 0) {
		if (bled)
			printk(KERN_ERR "%s%d: adapter kernel panic'd %x.\n",
				dev->name, dev->id, bled);
		bled = aac_adapter_sync_cmd(dev, IOP_RESET_ALWAYS,
			0, 0, 0, 0, 0, 0, &var, &reset_mask, NULL, NULL, NULL);
			if (bled || (var != 0x00000001))
				bled = -EINVAL;
		if (dev->supplement_adapter_info.SupportedOptions2 &
			AAC_OPTION_DOORBELL_RESET) {
			src_writel(dev, MUnit.IDR, reset_mask);
			msleep(5000); /* Delay 5 seconds */
		}
	}

	if (src_readl(dev, MUnit.OMR) & KERNEL_PANIC)
		return -ENODEV;

	if (startup_timeout < 300)
		startup_timeout = 300;

	return 0;
}

/**
 *	aac_src_select_comm	-	Select communications method
 *	@dev: Adapter
 *	@comm: communications method
 */
int aac_src_select_comm(struct aac_dev *dev, int comm)
{
	switch (comm) {
	case AAC_COMM_MESSAGE:
		dev->a_ops.adapter_enable_int = aac_src_enable_interrupt_message;
		dev->a_ops.adapter_intr = aac_src_intr_message;
		dev->a_ops.adapter_deliver = aac_src_deliver_message;
		break;
	default:
		return 1;
	}
	return 0;
}

/**
 *  aac_src_init	-	initialize an Cardinal Frey Bar card
 *  @dev: device to configure
 *
 */

int aac_src_init(struct aac_dev *dev)
{
	unsigned long start;
	unsigned long status;
	int restart = 0;
	int instance = dev->id;
	const char *name = dev->name;

	dev->a_ops.adapter_ioremap = aac_src_ioremap;
	dev->a_ops.adapter_comm = aac_src_select_comm;

	dev->base_size = AAC_MIN_SRC_BAR0_SIZE;
	if (aac_adapter_ioremap(dev, dev->base_size)) {
		printk(KERN_WARNING "%s: unable to map adapter.\n", name);
		goto error_iounmap;
	}

	/* Failure to reset here is an option ... */
	dev->a_ops.adapter_sync_cmd = src_sync_cmd;
	dev->a_ops.adapter_enable_int = aac_src_disable_interrupt;
	if ((aac_reset_devices || reset_devices) &&
		!aac_src_restart_adapter(dev, 0))
		++restart;
	/*
	 *	Check to see if the board panic'd while booting.
	 */
	status = src_readl(dev, MUnit.OMR);
	if (status & KERNEL_PANIC) {
		if (aac_src_restart_adapter(dev, aac_src_check_health(dev)))
			goto error_iounmap;
		++restart;
	}
	/*
	 *	Check to see if the board failed any self tests.
	 */
	status = src_readl(dev, MUnit.OMR);
	if (status & SELF_TEST_FAILED) {
		printk(KERN_ERR "%s%d: adapter self-test failed.\n",
			dev->name, instance);
		goto error_iounmap;
	}
	/*
	 *	Check to see if the monitor panic'd while booting.
	 */
	if (status & MONITOR_PANIC) {
		printk(KERN_ERR "%s%d: adapter monitor panic.\n",
			dev->name, instance);
		goto error_iounmap;
	}
	start = jiffies;
	/*
	 *	Wait for the adapter to be up and running. Wait up to 3 minutes
	 */
	while (!((status = src_readl(dev, MUnit.OMR)) &
		KERNEL_UP_AND_RUNNING)) {
		if ((restart &&
		  (status & (KERNEL_PANIC|SELF_TEST_FAILED|MONITOR_PANIC))) ||
		  time_after(jiffies, start+HZ*startup_timeout)) {
			printk(KERN_ERR "%s%d: adapter kernel failed to start, init status = %lx.\n",
					dev->name, instance, status);
			goto error_iounmap;
		}
		if (!restart &&
		  ((status & (KERNEL_PANIC|SELF_TEST_FAILED|MONITOR_PANIC)) ||
		  time_after(jiffies, start + HZ *
		  ((startup_timeout > 60)
		    ? (startup_timeout - 60)
		    : (startup_timeout / 2))))) {
			if (likely(!aac_src_restart_adapter(dev,
			    aac_src_check_health(dev))))
				start = jiffies;
			++restart;
		}
		msleep(1);
	}
	if (restart && aac_commit)
		aac_commit = 1;
	/*
	 *	Fill in the common function dispatch table.
	 */
	dev->a_ops.adapter_interrupt = aac_src_interrupt_adapter;
	dev->a_ops.adapter_disable_int = aac_src_disable_interrupt;
	dev->a_ops.adapter_notify = aac_src_notify_adapter;
	dev->a_ops.adapter_sync_cmd = src_sync_cmd;
	dev->a_ops.adapter_check_health = aac_src_check_health;
	dev->a_ops.adapter_restart = aac_src_restart_adapter;

	/*
	 *	First clear out all interrupts.  Then enable the one's that we
	 *	can handle.
	 */
	aac_adapter_comm(dev, AAC_COMM_MESSAGE);
	aac_adapter_disable_int(dev);
	src_writel(dev, MUnit.ODR_C, 0xffffffff);
	aac_adapter_enable_int(dev);

	if (aac_init_adapter(dev) == NULL)
		goto error_iounmap;
	if (dev->comm_interface != AAC_COMM_MESSAGE_TYPE1)
		goto error_iounmap;

	dev->msi = aac_msi && !pci_enable_msi(dev->pdev);

	if (request_irq(dev->pdev->irq, dev->a_ops.adapter_intr,
			IRQF_SHARED|IRQF_DISABLED, "aacraid", dev) < 0) {

		if (dev->msi)
			pci_disable_msi(dev->pdev);

		printk(KERN_ERR "%s%d: Interrupt unavailable.\n",
			name, instance);
		goto error_iounmap;
	}
	dev->dbg_base = pci_resource_start(dev->pdev, 2);
	dev->dbg_base_mapped = dev->regs.src.bar1;
	dev->dbg_size = AAC_MIN_SRC_BAR1_SIZE;

	aac_adapter_enable_int(dev);
	/*
	 *	Tell the adapter that all is configured, and it can
	 * start accepting requests
	 */
	aac_src_start_adapter(dev);

	return 0;

error_iounmap:

	return -1;
}