1/*
2 *	Adaptec AAC series RAID controller driver
3 *	(c) Copyright 2001 Red Hat Inc.	<alan@redhat.com>
4 *
5 * based on the old aacraid driver that is..
6 * Adaptec aacraid device driver for Linux.
7 *
8 * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2, or (at your option)
13 * any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; see the file COPYING.  If not, write to
22 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23 *
24 * Module Name:
25 *  rkt.c
26 *
27 * Abstract: Hardware miniport for Drawbridge specific hardware functions.
28 *
29 */
30
31#include <linux/blkdev.h>
32
33#include <scsi/scsi_host.h>
34
35#include "aacraid.h"
36
37#define AAC_NUM_IO_FIB_RKT      (246 - AAC_NUM_MGT_FIB)
38
39/**
40 *	aac_rkt_select_comm	-	Select communications method
41 *	@dev: Adapter
42 *	@comm: communications method
43 */
44
45static int aac_rkt_select_comm(struct aac_dev *dev, int comm)
46{
47	int retval;
48	retval = aac_rx_select_comm(dev, comm);
49	if (comm == AAC_COMM_MESSAGE) {
50		/*
51		 * FIB Setup has already been done, but we can minimize the
52		 * damage by at least ensuring the OS never issues more
53		 * commands than we can handle. The Rocket adapters currently
54		 * can only handle 246 commands and 8 AIFs at the same time,
55		 * and in fact do notify us accordingly if we negotiate the
56		 * FIB size. The problem that causes us to add this check is
57		 * to ensure that we do not overdo it with the adapter when a
58		 * hard coded FIB override is being utilized. This special
59		 * case warrants this half baked, but convenient, check here.
60		 */
61		if (dev->scsi_host_ptr->can_queue > AAC_NUM_IO_FIB_RKT) {
62			dev->init->MaxIoCommands =
63				cpu_to_le32(AAC_NUM_IO_FIB_RKT + AAC_NUM_MGT_FIB);
64			dev->scsi_host_ptr->can_queue = AAC_NUM_IO_FIB_RKT;
65		}
66	}
67	return retval;
68}
69
70/**
71 *	aac_rkt_ioremap
72 *	@size: mapping resize request
73 *
74 */
75static int aac_rkt_ioremap(struct aac_dev * dev, u32 size)
76{
77	if (!size) {
78		iounmap(dev->regs.rkt);
79		return 0;
80	}
81	dev->base = dev->regs.rkt = ioremap(dev->scsi_host_ptr->base, size);
82	if (dev->base == NULL)
83		return -1;
84	dev->IndexRegs = &dev->regs.rkt->IndexRegs;
85	return 0;
86}
87
88/**
89 *	aac_rkt_init	-	initialize an i960 based AAC card
90 *	@dev: device to configure
91 *
92 *	Allocate and set up resources for the i960 based AAC variants. The
93 *	device_interface in the commregion will be allocated and linked
94 *	to the comm region.
95 */
96
97int aac_rkt_init(struct aac_dev *dev)
98{
99	/*
100	 *	Fill in the function dispatch table.
101	 */
102	dev->a_ops.adapter_ioremap = aac_rkt_ioremap;
103	dev->a_ops.adapter_comm = aac_rkt_select_comm;
104
105	return _aac_rx_init(dev);
106}
107