1 /*
2 * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family
3 * of PCI-SCSI IO processors.
4 *
5 * Copyright (C) 1999-2001 Gerard Roudier <groudier@free.fr>
6 *
7 * This driver is derived from the Linux sym53c8xx driver.
8 * Copyright (C) 1998-2000 Gerard Roudier
9 *
10 * The sym53c8xx driver is derived from the ncr53c8xx driver that had been
11 * a port of the FreeBSD ncr driver to Linux-1.2.13.
12 *
13 * The original ncr driver has been written for 386bsd and FreeBSD by
14 * Wolfgang Stanglmeier <wolf@cologne.de>
15 * Stefan Esser <se@mi.Uni-Koeln.de>
16 * Copyright (C) 1994 Wolfgang Stanglmeier
17 *
18 * Other major contributions:
19 *
20 * NVRAM detection and reading.
21 * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
22 *
23 *-----------------------------------------------------------------------------
24 *
25 * This program is free software; you can redistribute it and/or modify
26 * it under the terms of the GNU General Public License as published by
27 * the Free Software Foundation; either version 2 of the License, or
28 * (at your option) any later version.
29 *
30 * This program is distributed in the hope that it will be useful,
31 * but WITHOUT ANY WARRANTY; without even the implied warranty of
32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
33 * GNU General Public License for more details.
34 *
35 * You should have received a copy of the GNU General Public License
36 * along with this program; if not, write to the Free Software
37 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
38 */
39
40 #ifndef SYM_MISC_H
41 #define SYM_MISC_H
42
43 /*
44 * A la VMS/CAM-3 queue management.
45 */
46 typedef struct sym_quehead {
47 struct sym_quehead *flink; /* Forward pointer */
48 struct sym_quehead *blink; /* Backward pointer */
49 } SYM_QUEHEAD;
50
51 #define sym_que_init(ptr) do { \
52 (ptr)->flink = (ptr); (ptr)->blink = (ptr); \
53 } while (0)
54
55 static inline struct sym_quehead *sym_que_first(struct sym_quehead *head)
56 {
57 return (head->flink == head) ? 0 : head->flink;
58 }
59
60 static inline struct sym_quehead *sym_que_last(struct sym_quehead *head)
61 {
62 return (head->blink == head) ? 0 : head->blink;
63 }
64
65 static inline void __sym_que_add(struct sym_quehead * new,
66 struct sym_quehead * blink,
67 struct sym_quehead * flink)
68 {
69 flink->blink = new;
70 new->flink = flink;
71 new->blink = blink;
72 blink->flink = new;
73 }
74
75 static inline void __sym_que_del(struct sym_quehead * blink,
76 struct sym_quehead * flink)
77 {
78 flink->blink = blink;
79 blink->flink = flink;
80 }
81
82 static inline int sym_que_empty(struct sym_quehead *head)
83 {
84 return head->flink == head;
85 }
86
87 static inline void sym_que_splice(struct sym_quehead *list,
88 struct sym_quehead *head)
89 {
90 struct sym_quehead *first = list->flink;
91
92 if (first != list) {
93 struct sym_quehead *last = list->blink;
94 struct sym_quehead *at = head->flink;
95
96 first->blink = head;
97 head->flink = first;
98
99 last->flink = at;
100 at->blink = last;
101 }
102 }
103
104 static inline void sym_que_move(struct sym_quehead *orig,
105 struct sym_quehead *dest)
106 {
107 struct sym_quehead *first, *last;
108
109 first = orig->flink;
110 if (first != orig) {
111 first->blink = dest;
112 dest->flink = first;
113 last = orig->blink;
114 last->flink = dest;
115 dest->blink = last;
116 orig->flink = orig;
117 orig->blink = orig;
118 } else {
119 dest->flink = dest;
120 dest->blink = dest;
121 }
122 }
123
124 #define sym_que_entry(ptr, type, member) container_of(ptr, type, member)
125
126 #define sym_insque(new, pos) __sym_que_add(new, pos, (pos)->flink)
127
128 #define sym_remque(el) __sym_que_del((el)->blink, (el)->flink)
129
130 #define sym_insque_head(new, head) __sym_que_add(new, head, (head)->flink)
131
132 static inline struct sym_quehead *sym_remque_head(struct sym_quehead *head)
133 {
134 struct sym_quehead *elem = head->flink;
135
136 if (elem != head)
137 __sym_que_del(head, elem->flink);
138 else
139 elem = NULL;
140 return elem;
141 }
142
143 #define sym_insque_tail(new, head) __sym_que_add(new, (head)->blink, head)
144
145 static inline struct sym_quehead *sym_remque_tail(struct sym_quehead *head)
146 {
147 struct sym_quehead *elem = head->blink;
148
149 if (elem != head)
150 __sym_que_del(elem->blink, head);
151 else
152 elem = 0;
153 return elem;
154 }
155
156 /*
157 * This one may be useful.
158 */
159 #define FOR_EACH_QUEUED_ELEMENT(head, qp) \
160 for (qp = (head)->flink; qp != (head); qp = qp->flink)
161 /*
162 * FreeBSD does not offer our kind of queue in the CAM CCB.
163 * So, we have to cast.
164 */
165 #define sym_qptr(p) ((struct sym_quehead *) (p))
166
167 /*
168 * Simple bitmap operations.
169 */
170 #define sym_set_bit(p, n) (((u32 *)(p))[(n)>>5] |= (1<<((n)&0x1f)))
171 #define sym_clr_bit(p, n) (((u32 *)(p))[(n)>>5] &= ~(1<<((n)&0x1f)))
172 #define sym_is_bit(p, n) (((u32 *)(p))[(n)>>5] & (1<<((n)&0x1f)))
173
174 /*
175 * The below round up/down macros are to be used with a constant
176 * as argument (sizeof(...) for example), for the compiler to
177 * optimize the whole thing.
178 */
179 #define _U_(a,m) (a)<=(1<<m)?m:
180
181 /*
182 * Round up logarithm to base 2 of a 16 bit constant.
183 */
184 #define _LGRU16_(a) \
185 ( \
186 _U_(a, 0)_U_(a, 1)_U_(a, 2)_U_(a, 3)_U_(a, 4)_U_(a, 5)_U_(a, 6)_U_(a, 7) \
187 _U_(a, 8)_U_(a, 9)_U_(a,10)_U_(a,11)_U_(a,12)_U_(a,13)_U_(a,14)_U_(a,15) \
188 16)
189
190 #endif /* SYM_MISC_H */
191
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