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
33 static 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 * @size: mapping resize request
61 *
62 */
63 static int aac_rkt_ioremap(struct aac_dev * dev, u32 size)
64 {
65 if (!size) {
66 iounmap(dev->regs.rkt);
67 return 0;
68 }
69 dev->base = dev->regs.rkt = ioremap(dev->base_start, size);
70 if (dev->base == NULL)
71 return -1;
72 dev->IndexRegs = &dev->regs.rkt->IndexRegs;
73 return 0;
74 }
75
76 /**
77 * aac_rkt_init - initialize an i960 based AAC card
78 * @dev: device to configure
79 *
80 * Allocate and set up resources for the i960 based AAC variants. The
81 * device_interface in the commregion will be allocated and linked
82 * to the comm region.
83 */
84
85 int aac_rkt_init(struct aac_dev *dev)
86 {
87 /*
88 * Fill in the function dispatch table.
89 */
90 dev->a_ops.adapter_ioremap = aac_rkt_ioremap;
91 dev->a_ops.adapter_comm = aac_rkt_select_comm;
92
93 return _aac_rx_init(dev);
94 }