Update the bktr driver to match the current state of FreeBSD-current,
[dragonfly.git] / sys / dev / video / bktr / bktr_mem.c
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1/* $FreeBSD: src/sys/dev/bktr/bktr_mem.c,v 1.13 2005/01/27 01:40:12 imp Exp */
2/* $DragonFly: src/sys/dev/video/bktr/bktr_mem.c,v 1.6 2005/03/12 11:35:27 corecode Exp $ */
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3
4/*
5 * This is prt of the Driver for Video Capture Cards (Frame grabbers)
6 * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
7 * chipset.
8 * Copyright Roger Hardiman.
9 *
10 * bktr_mem : This kernel module allows us to keep our allocated
11 * contiguous memory for the video buffer, DMA programs and VBI data
12 * while the main bktr driver is unloaded and reloaded.
13 * This avoids the problem of trying to allocate contiguous each
14 * time the bktr driver is loaded.
15 */
16
17/*
18 * 1. Redistributions of source code must retain the
19 * Copyright (c) 2000 Roger Hardiman
20 * All rights reserved.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * This product includes software developed by Roger Hardiman
33 * 4. The name of the author may not be used to endorse or promote products
34 * derived from this software without specific prior written permission.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
37 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
38 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
40 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
41 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
42 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
45 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
46 * POSSIBILITY OF SUCH DAMAGE.
47 */
48
49
50#include <sys/param.h>
51#include <sys/kernel.h>
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52#include <sys/systm.h>
53#include <dev/video/bktr/bktr_mem.h>
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54
55struct 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
64static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES];
65
66/*************************************************************/
67
68static int
69bktr_mem_modevent(module_t mod, int type, void *unused){
70
71 switch (type) {
72 case MOD_LOAD:
73 {
74 printf("bktr_mem: memory holder loaded\n");
a35cc233 75 bzero(memory_list, sizeof(memory_list));
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76 return 0;
77 }
78 case MOD_UNLOAD:
79 {
80 printf("bktr_mem: memory holder cannot be unloaded\n");
81 return EBUSY;
82 }
83 default:
84 break;
85 }
86 return 0;
87};
88
89/*************************************************************/
90
91int
92bktr_has_stored_addresses(int unit) {
93
94 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
95 printf("bktr_mem: Unit number %d invalid\n",unit);
96 return 0;
97 }
98
99 return memory_list[unit].addresses_stored;
100}
101
102/*************************************************************/
103
104void
105bktr_store_address(int unit, int type, vm_offset_t addr) {
106
107 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
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108 printf("bktr_mem: Unit number %d invalid for memory type %d, address %p\n"
109 ,unit,type,(void *)addr);
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110 return;
111 }
112
113 switch (type) {
114 case BKTR_MEM_DMA_PROG: memory_list[unit].dma_prog = addr;
115 memory_list[unit].addresses_stored = 1;
116 break;
117 case BKTR_MEM_ODD_DMA_PROG: memory_list[unit].odd_dma_prog = addr;
118 memory_list[unit].addresses_stored = 1;
119 break;
120 case BKTR_MEM_VBIDATA: memory_list[unit].vbidata = addr;
121 memory_list[unit].addresses_stored = 1;
122 break;
123 case BKTR_MEM_VBIBUFFER: memory_list[unit].vbibuffer = addr;
124 memory_list[unit].addresses_stored = 1;
125 break;
126 case BKTR_MEM_BUF: memory_list[unit].buf = addr;
127 memory_list[unit].addresses_stored = 1;
128 break;
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129 default: printf("bktr_mem: Invalid memory type %d for bktr%d, address %p\n",
130 type,unit,(void *)addr);
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131 break;
132 }
133}
134
135/*************************************************************/
136
137vm_offset_t
138bktr_retrieve_address(int unit, int type) {
139
140 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
141 printf("bktr_mem: Unit number %d too large for memory type %d\n",unit,type);
142 return NULL;
143 }
144 switch (type) {
145 case BKTR_MEM_DMA_PROG: return memory_list[unit].dma_prog;
146 case BKTR_MEM_ODD_DMA_PROG: return memory_list[unit].odd_dma_prog;
147 case BKTR_MEM_VBIDATA: return memory_list[unit].vbidata;
148 case BKTR_MEM_VBIBUFFER: return memory_list[unit].vbibuffer;
149 case BKTR_MEM_BUF: return memory_list[unit].buf;
150 default: printf("bktr_mem: Invalid memory type %d for bktr%d",type,unit);
151 return NULL;
152 }
153}
154
155/*************************************************************/
156
157static moduledata_t bktr_mem_mod = {
158 "bktr_mem",
159 bktr_mem_modevent,
160 0
161};
162/* The load order is First and module type is Driver to make sure bktr_mem
163 loads (and initialises) before bktr when both are loaded together */
164DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
165MODULE_VERSION(bktr_mem, 1);