xref: /linux/drivers/scsi/sym53c8xx_2/sym53c8xx.h (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)
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 */
203