1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *	Adaptec AAC series RAID controller driver
4 *	(c) Copyright 2001 Red Hat Inc.
5 *
6 * based on the old aacraid driver that is..
7 * Adaptec aacraid device driver for Linux.
8 *
9 * Copyright (c) 2000-2010 Adaptec, Inc.
10 *               2010-2015 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
11 *		 2016-2017 Microsemi Corp. (aacraid@microsemi.com)
12 *
13 * Module Name:
14 *  rkt.c
15 *
16 * Abstract: Hardware miniport for Drawbridge specific hardware functions.
17 */
18
19#include <linux/blkdev.h>
20
21#include <scsi/scsi_host.h>
22
23#include "aacraid.h"
24
25#define AAC_NUM_IO_FIB_RKT      (246 - AAC_NUM_MGT_FIB)
26
27/**
28 *	aac_rkt_select_comm	-	Select communications method
29 *	@dev: Adapter
30 *	@comm: communications method
31 */
32
33static int aac_rkt_select_comm(struct aac_dev *dev, int comm)
34{
35	int retval;
36	retval = aac_rx_select_comm(dev, comm);
37	if (comm == AAC_COMM_MESSAGE) {
38		/*
39		 * FIB Setup has already been done, but we can minimize the
40		 * damage by at least ensuring the OS never issues more
41		 * commands than we can handle. The Rocket adapters currently
42		 * can only handle 246 commands and 8 AIFs at the same time,
43		 * and in fact do notify us accordingly if we negotiate the
44		 * FIB size. The problem that causes us to add this check is
45		 * to ensure that we do not overdo it with the adapter when a
46		 * hard coded FIB override is being utilized. This special
47		 * case warrants this half baked, but convenient, check here.
48		 */
49		if (dev->scsi_host_ptr->can_queue > AAC_NUM_IO_FIB_RKT) {
50			dev->init->r7.max_io_commands =
51				cpu_to_le32(AAC_NUM_IO_FIB_RKT + AAC_NUM_MGT_FIB);
52			dev->scsi_host_ptr->can_queue = AAC_NUM_IO_FIB_RKT;
53		}
54	}
55	return retval;
56}
57
58/**
59 *	aac_rkt_ioremap
60 *	@dev: device to ioremap
61 *	@size: mapping resize request
62 *
63 */
64static int aac_rkt_ioremap(struct aac_dev * dev, u32 size)
65{
66	if (!size) {
67		iounmap(dev->regs.rkt);
68		return 0;
69	}
70	dev->base = dev->regs.rkt = ioremap(dev->base_start, size);
71	if (dev->base == NULL)
72		return -1;
73	dev->IndexRegs = &dev->regs.rkt->IndexRegs;
74	return 0;
75}
76
77/**
78 *	aac_rkt_init	-	initialize an i960 based AAC card
79 *	@dev: device to configure
80 *
81 *	Allocate and set up resources for the i960 based AAC variants. The
82 *	device_interface in the commregion will be allocated and linked
83 *	to the comm region.
84 */
85
86int aac_rkt_init(struct aac_dev *dev)
87{
88	/*
89	 *	Fill in the function dispatch table.
90	 */
91	dev->a_ops.adapter_ioremap = aac_rkt_ioremap;
92	dev->a_ops.adapter_comm = aac_rkt_select_comm;
93
94	return _aac_rx_init(dev);
95}
96