drivers/scsi/sym53c8xx_2/sym53c8xx.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family
   4  * of PCI-SCSI IO processors.
   5  *
   6  * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
   7  *
   8  * This driver is derived from the Linux sym53c8xx driver.
   9  * Copyright (C) 1998-2000  Gerard Roudier
  10  *
  11  * The sym53c8xx driver is derived from the ncr53c8xx driver that had been
  12  * a port of the FreeBSD ncr driver to Linux-1.2.13.
  13  *
  14  * The original ncr driver has been written for 386bsd and FreeBSD by
  15  *         Wolfgang Stanglmeier        <wolf@cologne.de>
  16  *         Stefan Esser                <se@mi.Uni-Koeln.de>
  17  * Copyright (C) 1994  Wolfgang Stanglmeier
  18  *
  19  * Other major contributions:
  20  *
  21  * NVRAM detection and reading.
  22  * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
  23  *
  24  *-----------------------------------------------------------------------------
  25  */
  26
  27 #ifndef SYM53C8XX_H
  28 #define SYM53C8XX_H
  29
  30
  31 /*
  32  *  DMA addressing mode.
  33  *
  34  *  0 : 32 bit addressing for all chips.
  35  *  1 : 40 bit addressing when supported by chip.
  36  *  2 : 64 bit addressing when supported by chip,
  37  *      limited to 16 segments of 4 GB -> 64 GB max.
  38  */
  39 #define SYM_CONF_DMA_ADDRESSING_MODE CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE
  40
  41 /*
  42  *  NVRAM support.
  43  */
  44 #if 1
  45 #define SYM_CONF_NVRAM_SUPPORT          (1)
  46 #endif
  47
  48 /*
  49  *  These options are not tunable from 'make config'
  50  */
  51 #if 1
  52 #define SYM_LINUX_PROC_INFO_SUPPORT
  53 #define SYM_LINUX_USER_COMMAND_SUPPORT
  54 #define SYM_LINUX_USER_INFO_SUPPORT
  55 #define SYM_LINUX_DEBUG_CONTROL_SUPPORT
  56 #endif
  57
  58 /*
  59  *  Also handle old NCR chips if not (0).
  60  */
  61 #define SYM_CONF_GENERIC_SUPPORT        (1)
  62
  63 /*
  64  *  Allow tags from 2 to 256, default 8
  65  */
  66 #ifndef CONFIG_SCSI_SYM53C8XX_MAX_TAGS
  67 #define CONFIG_SCSI_SYM53C8XX_MAX_TAGS  (8)
  68 #endif
  69
  70 #if     CONFIG_SCSI_SYM53C8XX_MAX_TAGS < 2
  71 #define SYM_CONF_MAX_TAG        (2)
  72 #elif   CONFIG_SCSI_SYM53C8XX_MAX_TAGS > 256
  73 #define SYM_CONF_MAX_TAG        (256)
  74 #else
  75 #define SYM_CONF_MAX_TAG        CONFIG_SCSI_SYM53C8XX_MAX_TAGS
  76 #endif
  77
  78 #ifndef CONFIG_SCSI_SYM53C8XX_DEFAULT_TAGS
  79 #define CONFIG_SCSI_SYM53C8XX_DEFAULT_TAGS      SYM_CONF_MAX_TAG
  80 #endif
  81
  82 /*
  83  *  Anyway, we configure the driver for at least 64 tags per LUN. :)
  84  */
  85 #if     SYM_CONF_MAX_TAG <= 64
  86 #define SYM_CONF_MAX_TAG_ORDER  (6)
  87 #elif   SYM_CONF_MAX_TAG <= 128
  88 #define SYM_CONF_MAX_TAG_ORDER  (7)
  89 #else
  90 #define SYM_CONF_MAX_TAG_ORDER  (8)
  91 #endif
  92
  93 /*
  94  *  Max number of SG entries.
  95  */
  96 #define SYM_CONF_MAX_SG         (96)
  97
  98 /*
  99  *  Driver setup structure.
 100  *
 101  *  This structure is initialized from linux config options.
 102  *  It can be overridden at boot-up by the boot command line.
 103  */
 104 struct sym_driver_setup {
 105         u_short max_tag;
 106         u_char  burst_order;
 107         u_char  scsi_led;
 108         u_char  scsi_diff;
 109         u_char  irq_mode;
 110         u_char  scsi_bus_check;
 111         u_char  host_id;
 112
 113         u_char  verbose;
 114         u_char  settle_delay;
 115         u_char  use_nvram;
 116         u_long  excludes[8];
 117 };
 118
 119 #define SYM_SETUP_MAX_TAG               sym_driver_setup.max_tag
 120 #define SYM_SETUP_BURST_ORDER           sym_driver_setup.burst_order
 121 #define SYM_SETUP_SCSI_LED              sym_driver_setup.scsi_led
 122 #define SYM_SETUP_SCSI_DIFF             sym_driver_setup.scsi_diff
 123 #define SYM_SETUP_IRQ_MODE              sym_driver_setup.irq_mode
 124 #define SYM_SETUP_SCSI_BUS_CHECK        sym_driver_setup.scsi_bus_check
 125 #define SYM_SETUP_HOST_ID               sym_driver_setup.host_id
 126 #define boot_verbose                    sym_driver_setup.verbose
 127
 128 /*
 129  *  Initial setup.
 130  *
 131  *  Can be overriden at startup by a command line.
 132  */
 133 #define SYM_LINUX_DRIVER_SETUP  {                               \
 134         .max_tag        = CONFIG_SCSI_SYM53C8XX_DEFAULT_TAGS,   \
 135         .burst_order    = 7,                                    \
 136         .scsi_led       = 1,                                    \
 137         .scsi_diff      = 1,                                    \
 138         .irq_mode       = 0,                                    \
 139         .scsi_bus_check = 1,                                    \
 140         .host_id        = 7,                                    \
 141         .verbose        = 0,                                    \
 142         .settle_delay   = 3,                                    \
 143         .use_nvram      = 1,                                    \
 144 }
 145
 146 extern struct sym_driver_setup sym_driver_setup;
 147 extern unsigned int sym_debug_flags;
 148 #define DEBUG_FLAGS     sym_debug_flags
 149
 150 /*
 151  *  Max number of targets.
 152  *  Maximum is 16 and you are advised not to change this value.
 153  */
 154 #ifndef SYM_CONF_MAX_TARGET
 155 #define SYM_CONF_MAX_TARGET     (16)
 156 #endif
 157
 158 /*
 159  *  Max number of logical units.
 160  *  SPI-2 allows up to 64 logical units, but in real life, target
 161  *  that implements more that 7 logical units are pretty rare.
 162  *  Anyway, the cost of accepting up to 64 logical unit is low in
 163  *  this driver, thus going with the maximum is acceptable.
 164  */
 165 #ifndef SYM_CONF_MAX_LUN
 166 #define SYM_CONF_MAX_LUN        (64)
 167 #endif
 168
 169 /*
 170  *  Max number of IO control blocks queued to the controller.
 171  *  Each entry needs 8 bytes and the queues are allocated contiguously.
 172  *  Since we donnot want to allocate more than a page, the theorical
 173  *  maximum is PAGE_SIZE/8. For safety, we announce a bit less to the
 174  *  access method. :)
 175  *  When not supplied, as it is suggested, the driver compute some
 176  *  good value for this parameter.
 177  */
 178 /* #define SYM_CONF_MAX_START   (PAGE_SIZE/8 - 16) */
 179
 180 /*
 181  *  Support for Immediate Arbitration.
 182  *  Not advised.
 183  */
 184 /* #define SYM_CONF_IARB_SUPPORT */
 185
 186 /*
 187  *  Only relevant if IARB support configured.
 188  *  - Max number of successive settings of IARB hints.
 189  *  - Set IARB on arbitration lost.
 190  */
 191 #define SYM_CONF_IARB_MAX 3
 192 #define SYM_CONF_SET_IARB_ON_ARB_LOST 1
 193
 194 /*
 195  *  Returning wrong residuals may make problems.
 196  *  When zero, this define tells the driver to
 197  *  always return 0 as transfer residual.
 198  *  Btw, all my testings of residuals have succeeded.
 199  */
 200 #define SYM_SETUP_RESIDUAL_SUPPORT 1
 201
 202 #endif /* SYM53C8XX_H */