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 | * @dev: device to ioremap |
61 | * @size: mapping resize request |
62 | * |
63 | */ |
64 | static int aac_rkt_ioremap(struct aac_dev * dev, u32 size) |
65 | { |
66 | if (!size) { |
67 | iounmap(addr: dev->regs.rkt); |
68 | return 0; |
69 | } |
70 | dev->base = dev->regs.rkt = ioremap(offset: 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 | |
86 | int 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 | |