1 /*
2 * This is part of the Driver for Video Capture Cards (Frame grabbers)
3 * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
4 * chipset.
5 * Copyright Roger Hardiman.
6 *
7 * bktr_mem : This kernel module allows us to keep our allocated
8 * contiguous memory for the video buffer, DMA programs and VBI data
9 * while the main bktr driver is unloaded and reloaded.
10 * This avoids the problem of trying to allocate contiguous each
11 * time the bktr driver is loaded.
12 */
13
14 /*-
15 * 1. Redistributions of source code must retain the
16 * Copyright (c) 2000 Roger Hardiman
17 * All rights reserved.
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
27 * 3. All advertising materials mentioning features or use of this software
28 * must display the following acknowledgement:
29 * This product includes software developed by Roger Hardiman
30 * 4. The name of the author may not be used to endorse or promote products
31 * derived from this software without specific prior written permission.
32 *
33 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
34 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
35 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
36 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
42 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
43 * POSSIBILITY OF SUCH DAMAGE.
44 */
45
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD: releng/8.4/sys/dev/bktr/bktr_mem.c 140883 2005-01-27 01:40:12Z imp $");
48
49 #include <sys/param.h>
50 #include <sys/kernel.h>
51 #include <sys/module.h>
52 #include <sys/systm.h>
53 #include <dev/bktr/bktr_mem.h>
54
55 struct memory_pointers {
56 int addresses_stored;
57 vm_offset_t dma_prog;
58 vm_offset_t odd_dma_prog;
59 vm_offset_t vbidata;
60 vm_offset_t vbibuffer;
61 vm_offset_t buf;
62 } memory_pointers;
63
64 static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES];
65
66 /*************************************************************/
67
68 static int
69 bktr_mem_modevent(module_t mod, int type, void *unused){
70
71 switch (type) {
72 case MOD_LOAD:
73 printf("bktr_mem: memory holder loaded\n");
74 /*
75 * bzero((caddr_t)memory_list, sizeof(memory_list));
76 * causes a panic. So use a simple for loop for now.
77 */
78 {
79 int x;
80 unsigned char *d;
81
82 d = (unsigned char *)memory_list;
83 for (x = 0; x < sizeof(memory_list); x++)
84 d[x] = 0;
85 }
86 return 0;
87 case MOD_UNLOAD:
88 printf("bktr_mem: memory holder cannot be unloaded\n");
89 return EBUSY;
90 default:
91 return EOPNOTSUPP;
92 break;
93 }
94 return (0);
95 }
96
97 /*************************************************************/
98
99 int
100 bktr_has_stored_addresses(int unit)
101 {
102
103 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) {
104 printf("bktr_mem: Unit number %d invalid\n", unit);
105 return 0;
106 }
107
108 return memory_list[unit].addresses_stored;
109 }
110
111 /*************************************************************/
112
113 void
114 bktr_store_address(int unit, int type, vm_offset_t addr)
115 {
116
117 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) {
118 printf("bktr_mem: Unit number %d invalid for memory type %d, address %p\n",
119 unit, type, (void *) addr);
120 return;
121 }
122
123 switch (type) {
124 case BKTR_MEM_DMA_PROG:
125 memory_list[unit].dma_prog = addr;
126 memory_list[unit].addresses_stored = 1;
127 break;
128 case BKTR_MEM_ODD_DMA_PROG:
129 memory_list[unit].odd_dma_prog = addr;
130 memory_list[unit].addresses_stored = 1;
131 break;
132 case BKTR_MEM_VBIDATA:
133 memory_list[unit].vbidata = addr;
134 memory_list[unit].addresses_stored = 1;
135 break;
136 case BKTR_MEM_VBIBUFFER:
137 memory_list[unit].vbibuffer = addr;
138 memory_list[unit].addresses_stored = 1;
139 break;
140 case BKTR_MEM_BUF:
141 memory_list[unit].buf = addr;
142 memory_list[unit].addresses_stored = 1;
143 break;
144 default:
145 printf("bktr_mem: Invalid memory type %d for bktr%d, address %p\n",
146 type, unit, (void *)addr);
147 break;
148 }
149 }
150
151 /*************************************************************/
152
153 vm_offset_t
154 bktr_retrieve_address(int unit, int type)
155 {
156
157 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) {
158 printf("bktr_mem: Unit number %d too large for memory type %d\n",
159 unit, type);
160 return (0);
161 }
162 switch (type) {
163 case BKTR_MEM_DMA_PROG:
164 return memory_list[unit].dma_prog;
165 case BKTR_MEM_ODD_DMA_PROG:
166 return memory_list[unit].odd_dma_prog;
167 case BKTR_MEM_VBIDATA:
168 return memory_list[unit].vbidata;
169 case BKTR_MEM_VBIBUFFER:
170 return memory_list[unit].vbibuffer;
171 case BKTR_MEM_BUF:
172 return memory_list[unit].buf;
173 default:
174 printf("bktr_mem: Invalid memory type %d for bktr%d",
175 type, unit);
176 return (0);
177 }
178 }
179
180 /*************************************************************/
181
182 static moduledata_t bktr_mem_mod = {
183 "bktr_mem",
184 bktr_mem_modevent,
185 0
186 };
187
188 /*
189 * The load order is First and module type is Driver to make sure bktr_mem
190 * loads (and initialises) before bktr when both are loaded together.
191 */
192 DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
193 MODULE_VERSION(bktr_mem, 1);
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