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(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 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