/*
 *      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.
 *               2010-2015 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
 *               2016-2017 Microsemi Corp. (aacraid@microsemi.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:
 *  sa.c
 *
 * Abstract: Drawbridge specific support functions
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/spinlock.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_sa_intr(int irq, void *dev_id)
{
        struct aac_dev *dev = dev_id;
        unsigned short intstat, mask;

        intstat = sa_readw(dev, DoorbellReg_p);
        /*
         *      Read mask and invert because drawbridge is reversed.
         *      This allows us to only service interrupts that have been enabled.
         */
        mask = ~(sa_readw(dev, SaDbCSR.PRISETIRQMASK));

        /* Check to see if this is our interrupt.  If it isn't just return */

        if (intstat & mask) {
                if (intstat & PrintfReady) {
                        aac_printf(dev, sa_readl(dev, Mailbox5));
                        sa_writew(dev, DoorbellClrReg_p, PrintfReady); /* clear PrintfReady */
                        sa_writew(dev, DoorbellReg_s, PrintfDone);
                } else if (intstat & DOORBELL_1) {      // dev -> Host Normal Command Ready
                        sa_writew(dev, DoorbellClrReg_p, DOORBELL_1);
                        aac_command_normal(&dev->queues->queue[HostNormCmdQueue]);
                } else if (intstat & DOORBELL_2) {      // dev -> Host Normal Response Ready
                        sa_writew(dev, DoorbellClrReg_p, DOORBELL_2);
                        aac_response_normal(&dev->queues->queue[HostNormRespQueue]);
                } else if (intstat & DOORBELL_3) {      // dev -> Host Normal Command Not Full
                        sa_writew(dev, DoorbellClrReg_p, DOORBELL_3);
                } else if (intstat & DOORBELL_4) {      // dev -> Host Normal Response Not Full
                        sa_writew(dev, DoorbellClrReg_p, DOORBELL_4);
                }
                return IRQ_HANDLED;
        }
        return IRQ_NONE;
}

/**
 *      aac_sa_disable_interrupt        -       disable interrupt
 *      @dev: Which adapter to enable.
 */

static void aac_sa_disable_interrupt (struct aac_dev *dev)
{
        sa_writew(dev, SaDbCSR.PRISETIRQMASK, 0xffff);
}

/**
 *      aac_sa_enable_interrupt -       enable interrupt
 *      @dev: Which adapter to enable.
 */

static void aac_sa_enable_interrupt (struct aac_dev *dev)
{
        sa_writew(dev, SaDbCSR.PRICLEARIRQMASK, (PrintfReady | DOORBELL_1 |
                                DOORBELL_2 | DOORBELL_3 | DOORBELL_4));
}

/**
 *      aac_sa_notify_adapter           -       handle adapter notification
 *      @dev:   Adapter that notification is for
 *      @event: Event to notidy
 *
 *      Notify the adapter of an event
 */
 
static void aac_sa_notify_adapter(struct aac_dev *dev, u32 event)
{
        switch (event) {

        case AdapNormCmdQue:
                sa_writew(dev, DoorbellReg_s,DOORBELL_1);
                break;
        case HostNormRespNotFull:
                sa_writew(dev, DoorbellReg_s,DOORBELL_4);
                break;
        case AdapNormRespQue:
                sa_writew(dev, DoorbellReg_s,DOORBELL_2);
                break;
        case HostNormCmdNotFull:
                sa_writew(dev, DoorbellReg_s,DOORBELL_3);
                break;
        case HostShutdown:
                /*
                sa_sync_cmd(dev, HOST_CRASHING, 0, 0, 0, 0, 0, 0,
                NULL, NULL, NULL, NULL, NULL);
                */
                break;
        case FastIo:
                sa_writew(dev, DoorbellReg_s,DOORBELL_6);
                break;
        case AdapPrintfDone:
                sa_writew(dev, DoorbellReg_s,DOORBELL_5);
                break;
        default:
                BUG();
                break;
        }
}


/**
 *      sa_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 sa_sync_cmd(struct aac_dev *dev, u32 command, 
                u32 p1, u32 p2, u32 p3, u32 p4, u32 p5, u32 p6,
                u32 *ret, u32 *r1, u32 *r2, u32 *r3, u32 *r4)
{
        unsigned long start;
        int ok;
        /*
         *      Write the Command into Mailbox 0
         */
        sa_writel(dev, Mailbox0, command);
        /*
         *      Write the parameters into Mailboxes 1 - 4
         */
        sa_writel(dev, Mailbox1, p1);
        sa_writel(dev, Mailbox2, p2);
        sa_writel(dev, Mailbox3, p3);
        sa_writel(dev, Mailbox4, p4);

        /*
         *      Clear the synch command doorbell to start on a clean slate.
         */
        sa_writew(dev, DoorbellClrReg_p, DOORBELL_0);
        /*
         *      Signal that there is a new synch command
         */
        sa_writew(dev, DoorbellReg_s, DOORBELL_0);

        ok = 0;
        start = jiffies;

        while(time_before(jiffies, start+30*HZ))
        {
                /*
                 *      Delay 5uS so that the monitor gets access
                 */
                udelay(5);
                /*
                 *      Mon110 will set doorbell0 bit when it has 
                 *      completed the command.
                 */
                if(sa_readw(dev, DoorbellReg_p) & DOORBELL_0)  {
                        ok = 1;
                        break;
                }
                msleep(1);
        }

        if (ok != 1)
                return -ETIMEDOUT;
        /*
         *      Clear the synch command doorbell.
         */
        sa_writew(dev, DoorbellClrReg_p, DOORBELL_0);
        /*
         *      Pull the synch status from Mailbox 0.
         */
        if (ret)
                *ret = sa_readl(dev, Mailbox0);
        if (r1)
                *r1 = sa_readl(dev, Mailbox1);
        if (r2)
                *r2 = sa_readl(dev, Mailbox2);
        if (r3)
                *r3 = sa_readl(dev, Mailbox3);
        if (r4)
                *r4 = sa_readl(dev, Mailbox4);
        return 0;
}

/**
 *      aac_sa_interrupt_adapter        -       interrupt an adapter
 *      @dev: Which adapter to enable.
 *
 *      Breakpoint an adapter.
 */
 
static void aac_sa_interrupt_adapter (struct aac_dev *dev)
{
        sa_sync_cmd(dev, BREAKPOINT_REQUEST, 0, 0, 0, 0, 0, 0,
                        NULL, NULL, NULL, NULL, NULL);
}

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

static void aac_sa_start_adapter(struct aac_dev *dev)
{
        union aac_init *init;
        /*
         * Fill in the remaining pieces of the init.
         */
        init = dev->init;
        init->r7.host_elapsed_seconds = cpu_to_le32(get_seconds());
        /* We can only use a 32 bit address here */
        sa_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS, 
                        (u32)(ulong)dev->init_pa, 0, 0, 0, 0, 0,
                        NULL, NULL, NULL, NULL, NULL);
}

static int aac_sa_restart_adapter(struct aac_dev *dev, int bled, u8 reset_type)
{
        return -EINVAL;
}

/**
 *      aac_sa_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_sa_check_health(struct aac_dev *dev)
{
        long status = sa_readl(dev, Mailbox7);

        /*
         *      Check to see if the board failed any self tests.
         */
        if (status & SELF_TEST_FAILED)
                return -1;
        /*
         *      Check to see if the board panic'd while booting.
         */
        if (status & KERNEL_PANIC)
                return -2;
        /*
         *      Wait for the adapter to be up and running. Wait up to 3 minutes
         */
        if (!(status & KERNEL_UP_AND_RUNNING))
                return -3;
        /*
         *      Everything is OK
         */
        return 0;
}

/**
 *      aac_sa_ioremap
 *      @size: mapping resize request
 *
 */
static int aac_sa_ioremap(struct aac_dev * dev, u32 size)
{
        if (!size) {
                iounmap(dev->regs.sa);
                return 0;
        }
        dev->base = dev->regs.sa = ioremap(dev->base_start, size);
        return (dev->base == NULL) ? -1 : 0;
}

/**
 *      aac_sa_init     -       initialize an ARM based AAC card
 *      @dev: device to configure
 *
 *      Allocate and set up resources for the ARM based AAC variants. The 
 *      device_interface in the commregion will be allocated and linked 
 *      to the comm region.
 */

int aac_sa_init(struct aac_dev *dev)
{
        unsigned long start;
        unsigned long status;
        int instance;
        const char *name;

        instance = dev->id;
        name     = dev->name;

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

        /*
         *      Check to see if the board failed any self tests.
         */
        if (sa_readl(dev, Mailbox7) & SELF_TEST_FAILED) {
                printk(KERN_WARNING "%s%d: adapter self-test failed.\n", name, instance);
                goto error_iounmap;
        }
        /*
         *      Check to see if the board panic'd while booting.
         */
        if (sa_readl(dev, Mailbox7) & KERNEL_PANIC) {
                printk(KERN_WARNING "%s%d: adapter kernel panic'd.\n", name, instance);
                goto error_iounmap;
        }
        start = jiffies;
        /*
         *      Wait for the adapter to be up and running. Wait up to 3 minutes.
         */
        while (!(sa_readl(dev, Mailbox7) & KERNEL_UP_AND_RUNNING)) {
                if (time_after(jiffies, start+startup_timeout*HZ)) {
                        status = sa_readl(dev, Mailbox7);
                        printk(KERN_WARNING "%s%d: adapter kernel failed to start, init status = %lx.\n", 
                                        name, instance, status);
                        goto error_iounmap;
                }
                msleep(1);
        }

        /*
         *      Fill in the function dispatch table.
         */

        dev->a_ops.adapter_interrupt = aac_sa_interrupt_adapter;
        dev->a_ops.adapter_disable_int = aac_sa_disable_interrupt;
        dev->a_ops.adapter_enable_int = aac_sa_enable_interrupt;
        dev->a_ops.adapter_notify = aac_sa_notify_adapter;
        dev->a_ops.adapter_sync_cmd = sa_sync_cmd;
        dev->a_ops.adapter_check_health = aac_sa_check_health;
        dev->a_ops.adapter_restart = aac_sa_restart_adapter;
        dev->a_ops.adapter_start = aac_sa_start_adapter;
        dev->a_ops.adapter_intr = aac_sa_intr;
        dev->a_ops.adapter_deliver = aac_rx_deliver_producer;
        dev->a_ops.adapter_ioremap = aac_sa_ioremap;

        /*
         *      First clear out all interrupts.  Then enable the one's that 
         *      we can handle.
         */
        aac_adapter_disable_int(dev);
        aac_adapter_enable_int(dev);

        if(aac_init_adapter(dev) == NULL)
                goto error_irq;
        dev->sync_mode = 0;     /* sync. mode not supported */
        if (request_irq(dev->pdev->irq, dev->a_ops.adapter_intr,
                        IRQF_SHARED, "aacraid", (void *)dev) < 0) {
                printk(KERN_WARNING "%s%d: Interrupt unavailable.\n",
                        name, instance);
                goto error_iounmap;
        }
        dev->dbg_base = dev->base_start;
        dev->dbg_base_mapped = dev->base;
        dev->dbg_size = dev->base_size;

        aac_adapter_enable_int(dev);

        /*
         *      Tell the adapter that all is configure, and it can start 
         *      accepting requests
         */
        aac_sa_start_adapter(dev);
        return 0;

error_irq:
        aac_sa_disable_interrupt(dev);
        free_irq(dev->pdev->irq, (void *)dev);

error_iounmap:

        return -1;
}