path: root/drivers/scsi/hptiop.c

/*
 * HighPoint RR3xxx controller driver for Linux
 * Copyright (C) 2006 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 linux@highpoint-tech.com
 *
 * 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/hdreg.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 SATA Controller Driver");

static char driver_name[] = "hptiop";
static const char driver_name_long[] = "RocketRAID 3xxx SATA Controller driver";
static const char driver_ver[] = "v1.0 (060426)";

static void hptiop_host_request_callback(struct hptiop_hba *hba, u32 tag);
static void hptiop_iop_request_callback(struct hptiop_hba *hba, u32 tag);
static void hptiop_message_callback(struct hptiop_hba *hba, u32 msg);

static inline void hptiop_pci_posting_flush(struct hpt_iopmu __iomem *iop)
{
	readl(&iop->outbound_intstatus);
}

static int iop_wait_ready(struct hpt_iopmu __iomem *iop, u32 millisec)
{
	u32 req = 0;
	int i;

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

	if (req != IOPMU_QUEUE_EMPTY) {
		writel(req, &iop->outbound_queue);
		hptiop_pci_posting_flush(iop);
		return 0;
	}

	return -1;
}

static void hptiop_request_callback(struct hptiop_hba *hba, u32 tag)
{
	if ((tag & IOPMU_QUEUE_MASK_HOST_BITS) == IOPMU_QUEUE_ADDR_HOST_BIT)
		return hptiop_host_request_callback(hba,
				tag & ~IOPMU_QUEUE_ADDR_HOST_BIT);
	else
		return hptiop_iop_request_callback(hba, tag);
}

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

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

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

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

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

static int __iop_intr(struct hptiop_hba *hba)
{
	struct hpt_iopmu __iomem *iop = hba->iop;
	u32 status;
	int ret = 0;

	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(hba);
		ret = 1;
	}

	return ret;
}

static int iop_send_sync_request(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->iop,
			&hba->iop->inbound_queue);

	hptiop_pci_posting_flush(hba->iop);

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

	return -1;
}

static int