xref: /openbmc/linux/drivers/scsi/aacraid/rkt.c (revision 3c4538f8)
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 
aac_rkt_select_comm(struct aac_dev * dev,int comm)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  */
aac_rkt_ioremap(struct aac_dev * dev,u32 size)64 static 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 
aac_rkt_init(struct aac_dev * dev)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