hptiop.c

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/*
 * HighPoint RR3xxx/4xxx controller driver for Linux
 * Copyright (C) 2006-2009 HighPoint Technologies, Inc. All Rights Reserved.
 *
 * 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; version 2 of the License.
 *
 * 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.
 *
 * Please report bugs/comments/suggestions to [email protected]
 *
 * For more information, visit http://www.highpoint-tech.com
 */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <linux/gfp.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/div64.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_host.h>

#include "hptiop.h"

MODULE_AUTHOR("HighPoint Technologies, Inc.");
MODULE_DESCRIPTION("HighPoint RocketRAID 3xxx/4xxx Controller Driver");

static char driver_name[] = "hptiop";
static const char driver_name_long[] = "RocketRAID 3xxx/4xxx Controller driver";
static const char driver_ver[] = "v1.6 (091225)";

static int iop_send_sync_msg(struct hptiop_hba *hba, u32 msg, u32 millisec);
static void hptiop_finish_scsi_req(struct hptiop_hba *hba, u32 tag,
                struct hpt_iop_request_scsi_command *req);
static void hptiop_host_request_callback_itl(struct hptiop_hba *hba, u32 tag);
static void hptiop_iop_request_callback_itl(struct hptiop_hba *hba, u32 tag);
static void hptiop_message_callback(struct hptiop_hba *hba, u32 msg);

static int iop_wait_ready_itl(struct hptiop_hba *hba, u32 millisec)
{
    u32 req = 0;
    int i;

    for (i = 0; i < millisec; i++) {
        req = readl(&hba->u.itl.iop->inbound_queue);
        if (req != IOPMU_QUEUE_EMPTY)
            break;
        msleep(1);
    }

    if (req != IOPMU_QUEUE_EMPTY) {
        writel(req, &hba->u.itl.iop->outbound_queue);
        readl(&hba->u.itl.iop->outbound_intstatus);
        return 0;
    }

    return -1;
}

static int iop_wait_ready_mv(struct hptiop_hba *hba, u32 millisec)
{
    return iop_send_sync_msg(hba, IOPMU_INBOUND_MSG0_NOP, millisec);
}

static void hptiop_request_callback_itl(struct hptiop_hba *hba, u32 tag)
{
    if (tag & IOPMU_QUEUE_ADDR_HOST_BIT)
        hptiop_host_request_callback_itl(hba,
                tag & ~IOPMU_QUEUE_ADDR_HOST_BIT);
    else
        hptiop_iop_request_callback_itl(hba, tag);
}

static void hptiop_drain_outbound_queue_itl(struct hptiop_hba *hba)
{
    u32 req;

    while ((req = readl(&hba->u.itl.iop->outbound_queue)) !=
                        IOPMU_QUEUE_EMPTY) {

        if (req & IOPMU_QUEUE_MASK_HOST_BITS)
            hptiop_request_callback_itl(hba, req);
        else {
            struct hpt_iop_request_header __iomem * p;

            p = (struct hpt_iop_request_header __iomem *)
                ((char __iomem *)hba->u.itl.iop + req);

            if (readl(&p->flags) & IOP_REQUEST_FLAG_SYNC_REQUEST) {
                if (readl(&p->context))
                    hptiop_request_callback_itl(hba, req);
                else
                    writel(1, &p->context);
            }
            else
                hptiop_request_callback_itl(hba, req);
        }
    }
}

static int iop_intr_itl(struct hptiop_hba *hba)
{
    struct hpt_iopmu_itl __iomem *iop = hba->u.itl.iop;
    void __iomem *plx = hba->u.itl.plx;
    u32 status;
    int ret = 0;

    if (plx && readl(plx + 0x11C5C) & 0xf)
        writel(1, plx + 0x11C60);

    status = readl(&iop->outbound_intstatus);

    if (status & IOPMU_OUTBOUND_INT_MSG0) {
        u32 msg = readl(&iop->outbound_msgaddr0);

        dprintk("received outbound msg %x\n", msg);
        writel(IOPMU_OUTBOUND_INT_MSG0, &iop->outbound_intstatus);
        hptiop_message_callback(hba, msg);
        ret = 1;
    }

    if (status & IOPMU_OUTBOUND_INT_POSTQUEUE) {
        hptiop_drain_outbound_queue_itl(hba);
        ret = 1;
    }

    return ret;
}

static u64 mv_outbound_read(struct hpt_iopmu_mv __iomem *mu)
{
    u32 outbound_tail = readl(&mu->outbound_tail);
    u32 outbound_head = readl(&mu->outbound_head);

    if (outbound_tail != outbound_head) {
        u64 p;

        memcpy_fromio(&p, &mu->outbound_q[mu->outbound_tail], 8);
        outbound_tail++;

        if (outbound_tail == MVIOP_QUEUE_LEN)
            outbound_tail = 0;
        writel(outbound_tail, &mu->outbound_tail);
        return p;
    } else
        return 0;
}

static void mv_inbound_write(u64 p, struct hptiop_hba *hba)
{
    u32 inbound_head = readl(&hba->u.mv.mu->inbound_head);
    u32 head = inbound_head + 1;

    if (head == MVIOP_QUEUE_LEN)
        head = 0;

    memcpy_toio(&hba->u.mv.mu->inbound_q[inbound_head], &p, 8);
    writel(head, &hba->u.mv.mu->inbound_head);
    writel(MVIOP_MU_INBOUND_INT_POSTQUEUE,
            &hba->u.mv.regs->inbound_doorbell);
}

static void hptiop_request_callback_mv(struct hptiop_hba *hba, u64 tag)
{
    u32 req_type = (tag >> 5) & 0x7;
    struct hpt_iop_request_scsi_command *req;

    dprintk("hptiop_request_callback_mv: tag=%llx\n", tag);

    BUG_ON((tag & MVIOP_MU_QUEUE_REQUEST_RETURN_CONTEXT) == 0);

    switch (req_type) {
    case IOP_REQUEST_TYPE_GET_CONFIG:
    case IOP_REQUEST_TYPE_SET_CONFIG:
        hba->msg_done = 1;
        break;

    case IOP_REQUEST_TYPE_SCSI_COMMAND:
        req = hba->reqs[tag >> 8].req_virt;
        if (likely(tag & MVIOP_MU_QUEUE_REQUEST_RESULT_BIT))
            req->header.result = cpu_to_le32(IOP_RESULT_SUCCESS);

        hptiop_finish_scsi_req(hba, tag>>8, req);
        break;

    default:
        break;
    }
}

static int iop_intr_mv(struct hptiop_hba *hba)
{
    u32 status;
    int ret = 0;

    status = readl(&hba->u.mv.regs->outbound_doorbell);
    writel(~status, &hba->u.mv.regs->outbound_doorbell);

    if (status & MVIOP_MU_OUTBOUND_INT_MSG) {
        u32 msg;
        msg = readl(&hba->u.mv.mu->outbound_msg);
        dprintk("received outbound msg %x\n", msg);
        hptiop_message_callback(hba, msg);
        ret = 1;
    }

    if (status & MVIOP_MU_OUTBOUND_INT_POSTQUEUE) {
        u64 tag;

        while ((tag = mv_outbound_read(hba->u.mv.mu)))
            hptiop_request_callback_mv(hba, tag);
        ret = 1;
    }

    return ret;
}

static int iop_send_sync_request_itl(struct hptiop_hba *hba,
                    void __iomem *_req, u32 millisec)
{
    struct hpt_iop_request_header __iomem *req = _req;
    u32 i;

    writel(readl(&req->flags) | IOP_REQUEST_FLAG_SYNC_REQUEST, &req->flags);
    writel(0, &req->context);
    writel((unsigned long)req - (unsigned long)hba->u.itl.iop,
            &hba->u.itl.iop->inbound_queue);
    readl(&hba->u.itl.iop->outbound_intstatus);

    for (i = 0; i < millisec; i++) {
        iop_intr_itl(hba);
        if (readl(&req->context))
            return 0;
        msleep(1);
    }

    return -1;
}

static int iop_send_sync_request_mv(struct hptiop_hba *hba,
                    u32 size_bits, u32 millisec)
{
    struct hpt_iop_request_header *reqhdr = hba->u.mv.internal_req;
    u32 i;

    hba->msg_done = 0;
    reqhdr->flags |= cpu_to_le32(IOP_REQUEST_FLAG_SYNC_REQUEST);
    mv_inbound_write(hba->u.mv.internal_req_phy |
            MVIOP_MU_QUEUE_ADDR_HOST_BIT | size_bits, hba);

    for (i = 0; i < millisec; i++) {
        iop_intr_mv(hba);
        if (hba->msg_done)
            return 0;
        msleep(1);
    }
    return -1;
}

static void hptiop_post_msg_itl(struct hptiop_hba *hba, u32 msg)
{
    writel(msg, &hba->u.itl.iop->inbound_msgaddr0);
    readl(&hba->u.itl.iop->outbound_intstatus);
}

static void hptiop_post_msg_mv(struct hptiop_hba *hba, u32 msg)
{
    writel(msg, &hba->u.mv.mu->inbound_msg);
    writel(MVIOP_MU_INBOUND_INT_MSG, &hba->u.mv.regs->inbound_doorbell);
    readl(&hba->u.mv.regs->inbound_doorbell);
}

static int iop_send_sync_msg(struct hptiop_hba *hba, u32 msg, u32 millisec)
{
    u32 i;

    hba->msg_done = 0;
    hba->ops->post_msg(hba, msg);

    for (i = 0; i < millisec; i++) {
        spin_lock_irq(hba->host->host_lock);
        hba->ops->iop_intr(hba);
        spin_unlock_irq(hba->host->host_lock);
        if (hba->msg_done)
            break;
        msleep(1);
    }

    return hba->msg_done? 0 : -1;
}

static int iop_get_config_itl(struct hptiop_hba *hba,
                struct hpt_iop_request_get_config *config)
{
    u32 req32;
    struct hpt_iop_request_get_config __iomem *req;

    req32 = readl(&hba->u.itl.iop->inbound_queue);
    if (req32 == IOPMU_QUEUE_EMPTY)
        return -1;

    req = (struct hpt_iop_request_get_config __iomem *)
            ((unsigned long)hba->u.itl.iop + req32);

    writel(0, &req->header.flags);
    writel(IOP_REQUEST_TYPE_GET_CONFIG, &req->header.type);
    writel(sizeof(struct hpt_iop_request_get_config), &req->header.size);
    writel(IOP_RESULT_PENDING, &req->header.result);

    if (iop_send_sync_request_itl(hba, req, 20000)) {
        dprintk("Get config send cmd failed\n");
        return -1;
    }

    memcpy_fromio(config, req, sizeof(*config));
    writel(req32, &hba->u.itl.iop->outbound_queue);
    return 0;
}

static int iop_get_config_mv(struct hptiop_hba *hba,
                struct hpt_iop_request_get_config *config)
{
    struct hpt_iop_request_get_config *req = hba->u.mv.internal_req;

    req->header.flags = cpu_to_le32(IOP_REQUEST_FLAG_OUTPUT_CONTEXT);
    req->header.type = cpu_to_le32(IOP_REQUEST_TYPE_GET_CONFIG);
    req->header.size =
        cpu_to_le32(sizeof(struct hpt_iop_request_get_config));
    req->header.result = cpu_to_le32(IOP_RESULT_PENDING);
    req->header.context = cpu_to_le32(IOP_REQUEST_TYPE_GET_CONFIG<<5);
    req->header.context_hi32 = 0;

    if (iop_send_sync_request_mv(hba, 0, 20000)) {
        dprintk("Get config send cmd failed\n");
        return -1;
    }

    memcpy(config, req, sizeof(struct hpt_iop_request_get_config));
    return 0;
}

static int iop_set_config_itl(struct hptiop_hba *hba,
                struct hpt_iop_request_set_config *config)
{
    u32 req32;
    struct hpt_iop_request_set_config __iomem *req;

    req32 = readl(&hba->u.itl.iop->inbound_queue);
    if (req32 == IOPMU_QUEUE_EMPTY)
        return -1;

    req = (struct hpt_iop_request_set_config __iomem *)
            ((unsigned long)hba->u.itl.iop + req32);

    memcpy_toio((u8 __iomem *)req + sizeof(struct hpt_iop_request_header),
        (u8 *)config + sizeof(struct hpt_iop_request_header),
        sizeof(struct hpt_iop_request_set_config) -
            sizeof(struct hpt_iop_request_header));

    writel(0, &req->header.flags);
    writel(IOP_REQUEST_TYPE_SET_CONFIG, &req->header.type);
    writel(sizeof(struct hpt_iop_request_set_config), &req->header.size);
    writel(IOP_RESULT_PENDING, &req->header.result);

    if (iop_send_sync_request_itl(hba, req, 20000)) {
        dprintk("Set config send cmd failed\n");
        return -1;
    }

    writel(req32, &hba->u.itl.iop->outbound_queue);
    return 0;
}

static int iop_set_config_mv(struct hptiop_hba *hba,
                struct hpt_iop_request_set_config *config)
{
    struct hpt_iop_request_set_config *req = hba->u.mv.internal_req;

    memcpy(req, config, sizeof(struct hpt_iop_request_set_config));
    req->header.flags = cpu_to_le32(IOP_REQUEST_FLAG_OUTPUT_CONTEXT);
    req->header.type = cpu_to_le32(IOP_REQUEST_TYPE_SET_CONFIG);
    req->header.size =
        cpu_to_le32(sizeof(struct hpt_iop_request_set_config));
    req->header.result = cpu_to_le32(IOP_RESULT_PENDING);
    req->header.context = cpu_to_le32(IOP_REQUEST_TYPE_SET_CONFIG<<5);
    req->header.context_hi32 = 0;

    if (iop_send_sync_request_mv(hba, 0, 20000)) {
        dprintk("Set config send cmd failed\n");
        return -1;
    }

    return 0;
}

static void hptiop_enable_intr_itl(struct hptiop_hba *hba)
{
    writel(~(IOPMU_OUTBOUND_INT_POSTQUEUE | IOPMU_OUTBOUND_INT_MSG0),
        &hba->u.itl.iop->outbound_intmask);
}

static void hptiop_enable_intr_mv(struct hptiop_hba *hba)
{
    writel(MVIOP_MU_OUTBOUND_INT_POSTQUEUE | MVIOP_MU_OUTBOUND_INT_MSG,
        &hba->u.mv.regs->outbound_intmask);
}

static int hptiop_initialize_iop(struct hptiop_hba *hba)
{
    /* enable interrupts */
    hba->ops->enable_intr(hba);

    hba->initialized = 1;

    /* start background tasks */
    if (iop_send_sync_msg(hba,
            IOPMU_INBOUND_MSG0_START_BACKGROUND_TASK, 5000)) {
        printk(KERN_ERR "scsi%d: fail to start background task\n",
            hba->host->host_no);
        return -1;
    }
    return 0;
}

static void __iomem *hptiop_map_pci_bar(struct hptiop_hba *hba, int index)
{
    u32 mem_base_phy, length;
    void __iomem *mem_base_virt;

    struct pci_dev *pcidev = hba->pcidev;


    if (!(pci_resource_flags(pcidev, index) & IORESOURCE_MEM)) {
        printk(KERN_ERR "scsi%d: pci resource invalid\n",
                hba->host->host_no);
        return NULL;
    }

    mem_base_phy = pci_resource_start(pcidev, index);
    length = pci_resource_len(pcidev, index);
    mem_base_virt = ioremap(mem_base_phy, length);

    if (!mem_base_virt) {
        printk(KERN_ERR "scsi%d: Fail to ioremap memory space\n",
                hba->host->host_no);
        return NULL;
    }
    return mem_base_virt;
}

static int hptiop_map_pci_bar_itl(struct hptiop_hba *hba)
{
    struct pci_dev *pcidev = hba->pcidev;
    hba->u.itl.iop = hptiop_map_pci_bar(hba, 0);
    if (hba->u.itl.iop == NULL)
        return -1;
    if ((pcidev->device & 0xff00) == 0x4400) {
        hba->u.itl.plx = hba->u.itl.iop;
        hba->u.itl.iop = hptiop_map_pci_bar(hba, 2);
        if (hba->u.itl.iop == NULL) {
            iounmap(hba->u.itl.plx);
            return -1;
        }
    }
    return 0;
}

static void hptiop_unmap_pci_bar_itl(struct hptiop_hba *hba)
{
    if (hba->u.itl.plx)
        iounmap(hba->u.itl.plx);
    iounmap(hba->u.itl.iop);
}

static int hptiop_map_pci_bar_mv(struct hptiop_hba *hba)
{
    hba->u.mv.regs = hptiop_map_pci_bar(hba, 0);
    if (hba->u.mv.regs == NULL)
        return -1;

    hba->u.mv.mu = hptiop_map_pci_bar(hba, 2);
    if (hba->u.mv.mu == NULL) {
        iounmap(hba->u.mv.regs);
        return -1;
    }

    return 0;
}

static void hptiop_unmap_pci_bar_mv(struct hptiop_hba *hba)
{
    iounmap(hba->u.mv.regs);
    iounmap(hba->u.mv.mu);
}

static void hptiop_message_callback(struct hptiop_hba *hba, u32 msg)
{
    dprintk("iop message 0x%x\n", msg);

    if (msg == IOPMU_INBOUND_MSG0_NOP)
        hba->msg_done = 1;

    if (!hba->initialized)
        return;

    if (msg == IOPMU_INBOUND_MSG0_RESET) {
        atomic_set(&hba->resetting, 0);
        wake_up(&hba->reset_wq);
    }
    else if (msg <= IOPMU_INBOUND_MSG0_MAX)
        hba->msg_done = 1;
}

static struct hptiop_request *get_req(struct hptiop_hba *hba)
{
    struct hptiop_request *ret;

    dprintk("get_req : req=%p\n", hba->req_list);

    ret = hba->req_list;
    if (ret)
        hba->req_list = ret->next;

    return ret;
}

static void free_req(struct hptiop_hba *hba, struct hptiop_request *req)
{
    dprintk("free_req(%d, %p)\n", req->index, req);
    req->next = hba->req_list;
    hba->req_list = req;
}

static void hptiop_finish_scsi_req(struct hptiop_hba *hba, u32 tag,
                struct hpt_iop_request_scsi_command *req)
{
    struct scsi_cmnd *scp;

    dprintk("hptiop_finish_scsi_req: req=%p, type=%d, "
            "result=%d, context=0x%x tag=%d\n",
            req, req->header.type, req->header.result,
            req->header.context, tag);

    BUG_ON(!req->header.result);
    BUG_ON(req->header.type != cpu_to_le32(IOP_REQUEST_TYPE_SCSI_COMMAND));

    scp = hba->reqs[tag].scp;

    if (HPT_SCP(scp)->mapped)
        scsi_dma_unmap(scp);

    switch (le32_to_cpu(req->header.result)) {
    case IOP_RESULT_SUCCESS:
        scsi_set_resid(scp,
            scsi_bufflen(scp) - le32_to_cpu(req->dataxfer_length));
        scp->result = (DID_OK<<16);
        break;
    case IOP_RESULT_BAD_TARGET:
        scp->result = (DID_BAD_TARGET<<16);
        break;
    case IOP_RESULT_BUSY:
        scp->result = (DID_BUS_BUSY<<16);
        break;
    case IOP_RESULT_RESET:
        scp->result = (DID_RESET<<16);
        break;
    case IOP_RESULT_FAIL:
        scp->result = (DID_ERROR<<16);
        break;
    case IOP_RESULT_INVALID_REQUEST:
        scp->result = (DID_ABORT<<16);
        break;
    case IOP_RESULT_CHECK_CONDITION:
        scsi_set_resid(scp,
            scsi_bufflen(scp) - le32_to_cpu(req->dataxfer_length));
        scp->result = SAM_STAT_CHECK_CONDITION;
        memcpy(scp->sense_buffer, &req->sg_list,
                min_t(size_t, SCSI_SENSE_BUFFERSIZE,
                    le32_to_cpu(req->dataxfer_length)));
        break;

    default:
        scp->result = DRIVER_INVALID << 24 | DID_ABORT << 16;
        break;
    }

    dprintk("scsi_done(%p)\n", scp);
    scp->scsi_done(scp);
    free_req(hba, &hba->reqs[tag]);
}

static void hptiop_host_request_callback_itl(struct hptiop_hba *hba, u32 _tag)
{
    struct hpt_iop_request_scsi_command *req;
    u32 tag;

    if (hba->iopintf_v2) {
        tag = _tag & ~IOPMU_QUEUE_REQUEST_RESULT_BIT;
        req = hba->reqs[tag].req_virt;
        if (likely(_tag & IOPMU_QUEUE_REQUEST_RESULT_BIT))
            req->header.result = cpu_to_le32(IOP_RESULT_SUCCESS);
    } else {
        tag = _tag;
        req = hba->reqs[tag].req_virt;
    }

    hptiop_finish_scsi_req(hba, tag, req);
}

void hptiop_iop_request_callback_itl(struct hptiop_hba *hba, u32 tag)
{
    struct hpt_iop_request_header __iomem *req;
    struct hpt_iop_request_ioctl_command __iomem *p;
    struct hpt_ioctl_k *arg;

    req = (struct hpt_iop_request_header __iomem *)
            ((unsigned long)hba->u.itl.iop + tag);
    dprintk("hptiop_iop_request_callback_itl: req=%p, type=%d, "
            "result=%d, context=0x%x tag=%d\n",
            req, readl(&req->type), readl(&req->result),
            readl(&req->context), tag);

    BUG_ON(!readl(&req->result));
    BUG_ON(readl(&req->type) != IOP_REQUEST_TYPE_IOCTL_COMMAND);

    p = (struct hpt_iop_request_ioctl_command __iomem *)req;
    arg = (struct hpt_ioctl_k *)(unsigned long)
        (readl(&req->context) |
            ((u64)readl(&req->context_hi32)<<32));

    if (readl(&req->result) == IOP_RESULT_SUCCESS) {
        arg->result = HPT_IOCTL_RESULT_OK;

        if (arg->outbuf_size)
            memcpy_fromio(arg->outbuf,
                &p->buf[(readl(&p->inbuf_size) + 3)& ~3],
                arg->outbuf_size);

        if (arg->bytes_returned)
            *arg->bytes_returned = arg->outbuf_size;
    }
    else
        arg->result = HPT_IOCTL_RESULT_FAILED;

    arg->done(arg);
    writel(tag, &hba->u.itl.iop->outbound_queue);
}

static irqreturn_t hptiop_intr(int irq, void *dev_id)
{
    struct hptiop_hba  *hba = dev_id;
    int  handled;
    unsigned long flags;

    spin_lock_irqsave(hba->host->host_lock, flags);
    handled = hba->ops->iop_intr(hba);
    spin_unlock_irqrestore(hba->host->host_lock, flags);

    return handled;
}

static int hptiop_buildsgl(struct scsi_cmnd *scp, struct hpt_iopsg *psg)
{
    struct Scsi_Host *host = scp->device->host;
    struct hptiop_hba *hba = (struct hptiop_hba *)host->hostdata;
    struct scatterlist *sg;
    int idx, nseg;

    nseg = scsi_dma_map(scp);
    BUG_ON(nseg < 0);
    if (!nseg)
        return 0;

    HPT_SCP(scp)->sgcnt = nseg;
    HPT_SCP(scp)->mapped = 1;

    BUG_ON(HPT_SCP(scp)->sgcnt > hba->max_sg_descriptors);

    scsi_for_each_sg(scp, sg, HPT_SCP(scp)->sgcnt, idx) {
        psg[idx].pci_address = cpu_to_le64(sg_dma_address(sg));
        psg[idx].size = cpu_to_le32(sg_dma_len(sg));
        psg[idx].eot = (idx == HPT_SCP(scp)->sgcnt - 1) ?
            cpu_to_le32(1) : 0;
    }
    return HPT_SCP(scp)->sgcnt;
}

static void hptiop_post_req_itl(struct hptiop_hba *hba,
                    struct hptiop_request *_req)
{
    struct hpt_iop_request_header *reqhdr = _req->req_virt;

    reqhdr->context = cpu_to_le32(IOPMU_QUEUE_ADDR_HOST_BIT |
                            (u32)_req->index);
    reqhdr->context_hi32 = 0;

    if (hba->iopintf_v2) {
        u32 size, size_bits;

        size = le32_to_cpu(reqhdr->size);
        if (size < 256)
            size_bits = IOPMU_QUEUE_REQUEST_SIZE_BIT;
        else if (size < 512)
            size_bits = IOPMU_QUEUE_ADDR_HOST_BIT;
        else
            size_bits = IOPMU_QUEUE_REQUEST_SIZE_BIT |
                        IOPMU_QUEUE_ADDR_HOST_BIT;
        writel(_req->req_shifted_phy | size_bits,
            &hba->u.itl.iop->inbound_queue);
    } else
        writel(_req->req_shifted_phy | IOPMU_QUEUE_ADDR_HOST_BIT,
                    &hba->u.itl.iop->inbound_queue);
}

static void hptiop_post_req_mv(struct hptiop_hba *hba,
                    struct hptiop_request *_req)
{
    struct hpt_iop_request_header *reqhdr = _req->req_virt;
    u32 size, size_bit;

    reqhdr->context = cpu_to_le32(_req->index<<8 |
                    IOP_REQUEST_TYPE_SCSI_COMMAND<<5);
    reqhdr->context_hi32 = 0;
    size = le32_to_cpu(reqhdr->size);

    if (size <= 256)
        size_bit = 0;
    else if (size <= 256*2)
        size_bit = 1;
    else if (size <= 256*3)
        size_bit = 2;
    else
        size_bit = 3;

    mv_inbound_write((_req->req_shifted_phy << 5) |
        MVIOP_MU_QUEUE_ADDR_HOST_BIT | size_bit, hba);
}

static int hptiop_queuecommand_lck(struct scsi_cmnd *scp,
                void (*done)(struct scsi_cmnd *))
{
    struct Scsi_Host *host = scp->device->host;
    struct hptiop_hba *hba = (struct hptiop_hba *)host->hostdata;
    struct hpt_iop_request_scsi_command *req;
    int sg_count = 0;
    struct hptiop_request *_req;

    BUG_ON(!done);
    scp->scsi_done = done;

    _req = get_req(hba);
    if (_req == NULL) {
        dprintk("hptiop_queuecmd : no free req\n");
        return SCSI_MLQUEUE_HOST_BUSY;
    }

    _req->scp = scp;

    dprintk("hptiop_queuecmd(scp=%p) %d/%d/%d/%d cdb=(%x-%x-%x) "
            "req_index=%d, req=%p\n",
            scp,
            host->host_no, scp->device->channel,
            scp->device->id, scp->device->lun,
            ((u32 *)scp->cmnd)[0],
            ((u32 *)scp->cmnd)[1],
            ((u32 *)scp->cmnd)[2],
            _req->index, _req->req_virt);

    scp->result = 0;

    if (scp->device->channel || scp->device->lun ||
            scp->device->id > hba->max_devices) {
        scp->result = DID_BAD_TARGET << 16;
        free_req(hba, _req);
        goto cmd_done;
    }

    req = _req->req_virt;

    /* build S/G table */
    sg_count = hptiop_buildsgl(scp, req->sg_list);
    if (!sg_count)
        HPT_SCP(scp)->mapped = 0;

    req->header.flags = cpu_to_le32(IOP_REQUEST_FLAG_OUTPUT_CONTEXT);
    req->header.type = cpu_to_le32(IOP_REQUEST_TYPE_SCSI_COMMAND);
    req->header.result = cpu_to_le32(IOP_RESULT_PENDING);
    req->dataxfer_length = cpu_to_le32(scsi_bufflen(scp));
    req->channel = scp->device->channel;
    req->target = scp->device->id;
    req->lun = scp->device->lun;
    req->header.size = cpu_to_le32(
                sizeof(struct hpt_iop_request_scsi_command)
                 - sizeof(struct hpt_iopsg)
                 + sg_count * sizeof(struct hpt_iopsg));

    memcpy(req->cdb, scp->cmnd, sizeof(req->cdb));
    hba->ops->post_req(hba, _req);
    return 0;

cmd_done:
    dprintk("scsi_done(scp=%p)\n", scp);
    scp->scsi_done(scp);
    return 0;
}

static DEF_SCSI_QCMD(hptiop_queuecommand)

static const char *hptiop_info(struct Scsi_Host *host)
{
    return driver_name_long;
}

static int hptiop_reset_hba(struct hptiop_hba *hba)
{
    if (atomic_xchg(&hba->resetting, 1) == 0) {
        atomic_inc(&hba->reset_count);
        hba->ops->post_msg(hba, IOPMU_INBOUND_MSG0_RESET);
    }

    wait_event_timeout(hba->reset_wq,
            atomic_read(&hba->resetting) == 0, 60 * HZ);

    if (atomic_read(&hba->resetting)) {
        /* IOP is in unknown state, abort reset */
        printk(KERN_ERR "scsi%d: reset failed\n", hba->host->host_no);
        return -1;
    }

    if (iop_send_sync_msg(hba,
        IOPMU_INBOUND_MSG0_START_BACKGROUND_TASK, 5000)) {
        dprintk("scsi%d: fail to start background task\n",
                hba->host->host_no);
    }

    return 0;
}

static int hptiop_reset(struct scsi_cmnd *scp)
{
    struct Scsi_Host * host = scp->device->host;
    struct hptiop_hba * hba = (struct hptiop_hba *)host->hostdata;

    printk(KERN_WARNING "hptiop_reset(%d/%d/%d) scp=%p\n",
            scp->device->host->host_no, scp->device->channel,
            scp->device->id, scp);

    return hptiop_reset_hba(hba)? FAILED : SUCCESS;
}

static int hptiop_adjust_disk_queue_depth(struct scsi_device *sdev,
                      int queue_depth, int reason)
{
    struct hptiop_hba *hba = (struct hptiop_hba *)sdev->host->hostdata;

    if (reason != SCSI_QDEPTH_DEFAULT)
        return -EOPNOTSUPP;

    if (queue_depth > hba->max_requests)
        queue_depth = hba->max_requests;
    scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, queue_depth);
    return queue_depth;
}

static ssize_t hptiop_show_version(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
    return snprintf(buf, PAGE_SIZE, "%s\n", driver_ver);
}

static ssize_t hptiop_show_fw_version(struct device *dev,
                      struct device_attribute *attr, char *buf)
{
    struct Scsi_Host *host = class_to_shost(dev);
    struct hptiop_hba *hba = (struct hptiop_hba *)host->hostdata;

    return snprintf(buf, PAGE_SIZE, "%d.%d.%d.%d\n",
                hba->firmware_version >> 24,
                (hba->firmware_version >> 16) & 0xff,
                (hba->firmware_version >> 8) & 0xff,
                hba->firmware_version & 0xff);
}

static struct device_attribute hptiop_attr_version = {
    .attr = {
        .name = "driver-version",
        .mode = S_IRUGO,
    },
    .show = hptiop_show_version,
};

static struct device_attribute hptiop_attr_fw_version = {
    .attr = {
        .name = "firmware-version",
        .mode = S_IRUGO,
    },
    .show = hptiop_show_fw_version,
};

static struct device_attribute *hptiop_attrs[] = {
    &hptiop_attr_version,
    &hptiop_attr_fw_version,
    NULL
};

static struct scsi_host_template driver_template = {
    .module                     = THIS_MODULE,
    .name                       = driver_name,
    .queuecommand               = hptiop_queuecommand,
    .eh_device_reset_handler    = hptiop_reset,
    .eh_bus_reset_handler       = hptiop_reset,
    .info                       = hptiop_info,
    .emulated                   = 0,
    .use_clustering             = ENABLE_CLUSTERING,
    .proc_name                  = driver_name,
    .shost_attrs                = hptiop_attrs,
    .this_id                    = -1,
    .change_queue_depth         = hptiop_adjust_disk_queue_depth,
};

static int hptiop_internal_memalloc_mv(struct hptiop_hba *hba)
{
    hba->u.mv.internal_req = dma_alloc_coherent(&hba->pcidev->dev,
            0x800, &hba->u.mv.internal_req_phy, GFP_KERNEL);
    if (hba->u.mv.internal_req)
        return 0;
    else
        return -1;
}

static int hptiop_internal_memfree_mv(struct hptiop_hba *hba)
{
    if (hba->u.mv.internal_req) {
        dma_free_coherent(&hba->pcidev->dev, 0x800,
            hba->u.mv.internal_req, hba->u.mv.internal_req_phy);
        return 0;
    } else
        return -1;
}

static int __devinit hptiop_probe(struct pci_dev *pcidev,
                    const struct pci_device_id *id)
{
    struct Scsi_Host *host = NULL;
    struct hptiop_hba *hba;
    struct hptiop_adapter_ops *iop_ops;
    struct hpt_iop_request_get_config iop_config;
    struct hpt_iop_request_set_config set_config;
    dma_addr_t start_phy;
    void *start_virt;
    u32 offset, i, req_size;

    dprintk("hptiop_probe(%p)\n", pcidev);

    if (pci_enable_device(pcidev)) {
        printk(KERN_ERR "hptiop: fail to enable pci device\n");
        return -ENODEV;
    }

    printk(KERN_INFO "adapter at PCI %d:%d:%d, IRQ %d\n",
        pcidev->bus->number, pcidev->devfn >> 3, pcidev->devfn & 7,
        pcidev->irq);

    pci_set_master(pcidev);

    /* Enable 64bit DMA if possible */
    iop_ops = (struct hptiop_adapter_ops *)id->driver_data;
    if (pci_set_dma_mask(pcidev, DMA_BIT_MASK(iop_ops->hw_dma_bit_mask))) {
        if (pci_set_dma_mask(pcidev, DMA_BIT_MASK(32))) {
            printk(KERN_ERR "hptiop: fail to set dma_mask\n");
            goto disable_pci_device;
        }
    }

    if (pci_request_regions(pcidev, driver_name)) {
        printk(KERN_ERR "hptiop: pci_request_regions failed\n");
        goto disable_pci_device;
    }

    host = scsi_host_alloc(&driver_template, sizeof(struct hptiop_hba));
    if (!host) {
        printk(KERN_ERR "hptiop: fail to alloc scsi host\n");
        goto free_pci_regions;
    }

    hba = (struct hptiop_hba *)host->hostdata;

    hba->ops = iop_ops;
    hba->pcidev = pcidev;
    hba->host = host;
    hba->initialized = 0;
    hba->iopintf_v2 = 0;

    atomic_set(&hba->resetting, 0);
    atomic_set(&hba->reset_count, 0);

    init_waitqueue_head(&hba->reset_wq);
    init_waitqueue_head(&hba->ioctl_wq);

    host->max_lun = 1;
    host->max_channel = 0;
    host->io_port = 0;
    host->n_io_port = 0;
    host->irq = pcidev->irq;

    if (hba->ops->map_pci_bar(hba))
        goto free_scsi_host;

    if (hba->ops->iop_wait_ready(hba, 20000)) {
        printk(KERN_ERR "scsi%d: firmware not ready\n",
                hba->host->host_no);
        goto unmap_pci_bar;
    }

    if (hba->ops->internal_memalloc) {
        if (hba->ops->internal_memalloc(hba)) {
            printk(KERN_ERR "scsi%d: internal_memalloc failed\n",
                hba->host->host_no);
            goto unmap_pci_bar;
        }
    }

    if (hba->ops->get_config(hba, &iop_config)) {
        printk(KERN_ERR "scsi%d: get config failed\n",
                hba->host->host_no);
        goto unmap_pci_bar;
    }

    hba->max_requests = min(le32_to_cpu(iop_config.max_requests),
                HPTIOP_MAX_REQUESTS);
    hba->max_devices = le32_to_cpu(iop_config.max_devices);
    hba->max_request_size = le32_to_cpu(iop_config.request_size);
    hba->max_sg_descriptors = le32_to_cpu(iop_config.max_sg_count);
    hba->firmware_version = le32_to_cpu(iop_config.firmware_version);
    hba->interface_version = le32_to_cpu(iop_config.interface_version);
    hba->sdram_size = le32_to_cpu(iop_config.sdram_size);

    if (hba->firmware_version > 0x01020000 ||
            hba->interface_version > 0x01020000)
        hba->iopintf_v2 = 1;

    host->max_sectors = le32_to_cpu(iop_config.data_transfer_length) >> 9;
    host->max_id = le32_to_cpu(iop_config.max_devices);
    host->sg_tablesize = le32_to_cpu(iop_config.max_sg_count);
    host->can_queue = le32_to_cpu(iop_config.max_requests);
    host->cmd_per_lun = le32_to_cpu(iop_config.max_requests);
    host->max_cmd_len = 16;

    req_size = sizeof(struct hpt_iop_request_scsi_command)
        + sizeof(struct hpt_iopsg) * (hba->max_sg_descriptors - 1);
    if ((req_size & 0x1f) != 0)
        req_size = (req_size + 0x1f) & ~0x1f;

    memset(&set_config, 0, sizeof(struct hpt_iop_request_set_config));
    set_config.iop_id = cpu_to_le32(host->host_no);
    set_config.vbus_id = cpu_to_le16(host->host_no);
    set_config.max_host_request_size = cpu_to_le16(req_size);

    if (hba->ops->set_config(hba, &set_config)) {
        printk(KERN_ERR "scsi%d: set config failed\n",
                hba->host->host_no);
        goto unmap_pci_bar;
    }

    pci_set_drvdata(pcidev, host);

    if (request_irq(pcidev->irq, hptiop_intr, IRQF_SHARED,
                    driver_name, hba)) {
        printk(KERN_ERR "scsi%d: request irq %d failed\n",
                    hba->host->host_no, pcidev->irq);
        goto unmap_pci_bar;
    }

    /* Allocate request mem */

    dprintk("req_size=%d, max_requests=%d\n", req_size, hba->max_requests);

    hba->req_size = req_size;
    start_virt = dma_alloc_coherent(&pcidev->dev,
                hba->req_size*hba->max_requests + 0x20,
                &start_phy, GFP_KERNEL);

    if (!start_virt) {
        printk(KERN_ERR "scsi%d: fail to alloc request mem\n",
                    hba->host->host_no);
        goto free_request_irq;
    }

    hba->dma_coherent = start_virt;
    hba->dma_coherent_handle = start_phy;

    if ((start_phy & 0x1f) != 0)
    {
        offset = ((start_phy + 0x1f) & ~0x1f) - start_phy;
        start_phy += offset;
        start_virt += offset;
    }

    hba->req_list = start_virt;
    for (i = 0; i < hba->max_requests; i++) {
        hba->reqs[i].next = NULL;
        hba->reqs[i].req_virt = start_virt;
        hba->reqs[i].req_shifted_phy = start_phy >> 5;
        hba->reqs[i].index = i;
        free_req(hba, &hba->reqs[i]);
        start_virt = (char *)start_virt + hba->req_size;
        start_phy = start_phy + hba->req_size;
    }

    /* Enable Interrupt and start background task */
    if (hptiop_initialize_iop(hba))
        goto free_request_mem;

    if (scsi_add_host(host, &pcidev->dev)) {
        printk(KERN_ERR "scsi%d: scsi_add_host failed\n",
                    hba->host->host_no);
        goto free_request_mem;
    }


    scsi_scan_host(host);

    dprintk("scsi%d: hptiop_probe successfully\n", hba->host->host_no);
    return 0;

free_request_mem:
    dma_free_coherent(&hba->pcidev->dev,
            hba->req_size * hba->max_requests + 0x20,
            hba->dma_coherent, hba->dma_coherent_handle);

free_request_irq:
    free_irq(hba->pcidev->irq, hba);

unmap_pci_bar:
    if (hba->ops->internal_memfree)
        hba->ops->internal_memfree(hba);

    hba->ops->unmap_pci_bar(hba);

free_scsi_host:
    scsi_host_put(host);

free_pci_regions:
    pci_release_regions(pcidev);

disable_pci_device:
    pci_disable_device(pcidev);

    dprintk("scsi%d: hptiop_probe fail\n", host ? host->host_no : 0);
    return -ENODEV;
}

static void hptiop_shutdown(struct pci_dev *pcidev)
{
    struct Scsi_Host *host = pci_get_drvdata(pcidev);
    struct hptiop_hba *hba = (struct hptiop_hba *)host->hostdata;

    dprintk("hptiop_shutdown(%p)\n", hba);

    /* stop the iop */
    if (iop_send_sync_msg(hba, IOPMU_INBOUND_MSG0_SHUTDOWN, 60000))
        printk(KERN_ERR "scsi%d: shutdown the iop timeout\n",
                    hba->host->host_no);

    /* disable all outbound interrupts */
    hba->ops->disable_intr(hba);
}

static void hptiop_disable_intr_itl(struct hptiop_hba *hba)
{
    u32 int_mask;

    int_mask = readl(&hba->u.itl.iop->outbound_intmask);
    writel(int_mask |
        IOPMU_OUTBOUND_INT_MSG0 | IOPMU_OUTBOUND_INT_POSTQUEUE,
        &hba->u.itl.iop->outbound_intmask);
    readl(&hba->u.itl.iop->outbound_intmask);
}

static void hptiop_disable_intr_mv(struct hptiop_hba *hba)
{
    writel(0, &hba->u.mv.regs->outbound_intmask);
    readl(&hba->u.mv.regs->outbound_intmask);
}

static void hptiop_remove(struct pci_dev *pcidev)
{
    struct Scsi_Host *host = pci_get_drvdata(pcidev);
    struct hptiop_hba *hba = (struct hptiop_hba *)host->hostdata;

    dprintk("scsi%d: hptiop_remove\n", hba->host->host_no);

    scsi_remove_host(host);

    hptiop_shutdown(pcidev);

    free_irq(hba->pcidev->irq, hba);

    dma_free_coherent(&hba->pcidev->dev,
            hba->req_size * hba->max_requests + 0x20,
            hba->dma_coherent,
            hba->dma_coherent_handle);

    if (hba->ops->internal_memfree)
        hba->ops->internal_memfree(hba);

    hba->ops->unmap_pci_bar(hba);

    pci_release_regions(hba->pcidev);
    pci_set_drvdata(hba->pcidev, NULL);
    pci_disable_device(hba->pcidev);

    scsi_host_put(host);
}

static struct hptiop_adapter_ops hptiop_itl_ops = {
    .iop_wait_ready    = iop_wait_ready_itl,
    .internal_memalloc = NULL,
    .internal_memfree  = NULL,
    .map_pci_bar       = hptiop_map_pci_bar_itl,
    .unmap_pci_bar     = hptiop_unmap_pci_bar_itl,
    .enable_intr       = hptiop_enable_intr_itl,
    .disable_intr      = hptiop_disable_intr_itl,
    .get_config        = iop_get_config_itl,
    .set_config        = iop_set_config_itl,
    .iop_intr          = iop_intr_itl,
    .post_msg          = hptiop_post_msg_itl,
    .post_req          = hptiop_post_req_itl,
    .hw_dma_bit_mask   = 64,
};

static struct hptiop_adapter_ops hptiop_mv_ops = {
    .iop_wait_ready    = iop_wait_ready_mv,
    .internal_memalloc = hptiop_internal_memalloc_mv,
    .internal_memfree  = hptiop_internal_memfree_mv,
    .map_pci_bar       = hptiop_map_pci_bar_mv,
    .unmap_pci_bar     = hptiop_unmap_pci_bar_mv,
    .enable_intr       = hptiop_enable_intr_mv,
    .disable_intr      = hptiop_disable_intr_mv,
    .get_config        = iop_get_config_mv,
    .set_config        = iop_set_config_mv,
    .iop_intr          = iop_intr_mv,
    .post_msg          = hptiop_post_msg_mv,
    .post_req          = hptiop_post_req_mv,
    .hw_dma_bit_mask   = 33,
};

static struct pci_device_id hptiop_id_table[] = {
    { PCI_VDEVICE(TTI, 0x3220), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3320), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3410), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3510), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3511), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3520), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3521), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3522), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3530), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3540), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3560), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x4210), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x4211), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x4310), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x4311), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x4320), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x4321), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x4322), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x4400), (kernel_ulong_t)&hptiop_itl_ops },
    { PCI_VDEVICE(TTI, 0x3120), (kernel_ulong_t)&hptiop_mv_ops },
    { PCI_VDEVICE(TTI, 0x3122), (kernel_ulong_t)&hptiop_mv_ops },
    { PCI_VDEVICE(TTI, 0x3020), (kernel_ulong_t)&hptiop_mv_ops },
    {},
};

MODULE_DEVICE_TABLE(pci, hptiop_id_table);

static struct pci_driver hptiop_pci_driver = {
    .name       = driver_name,
    .id_table   = hptiop_id_table,
    .probe      = hptiop_probe,
    .remove     = hptiop_remove,
    .shutdown   = hptiop_shutdown,
};

static int __init hptiop_module_init(void)
{
    printk(KERN_INFO "%s %s\n", driver_name_long, driver_ver);
    return pci_register_driver(&hptiop_pci_driver);
}

static void __exit hptiop_module_exit(void)
{
    pci_unregister_driver(&hptiop_pci_driver);
}


module_init(hptiop_module_init);
module_exit(hptiop_module_exit);

MODULE_LICENSE("GPL");