1 /*
2 * OpenBIOS - free your system!
3 * ( firmware/flash device driver for Linux )
4 *
5 * bios_core.c - core skeleton
6 *
7 * This program is part of a free implementation of the IEEE 1275-1994
8 * Standard for Boot (Initialization Configuration) Firmware.
9 *
10 * Copyright (C) 1998-2004 Stefan Reinauer
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; version 2 of the License.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
24 *
25 */
26
27 #include <linux/config.h>
28 #include <linux/version.h>
29 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
30 #ifdef MODULE
31 #ifdef MODVERSIONS
32 #include <linux/modversions.h>
33 #endif
34 #endif
35 #include <linux/module.h>
36 #endif
37 #include <linux/pci.h>
38 #include <linux/errno.h>
39 #include <linux/vmalloc.h>
40 #include <linux/init.h>
41
42 #include <asm/io.h>
43
44 #include "bios.h"
45 #include "pcisets.h"
46 #include "flashchips.h"
47 #include "programming.h"
48
49 extern struct file_operations bios_fops;
50 int bios_proc_register(void);
51 int bios_proc_unregister(void);
52
53 int write = 0;
54
55 spinlock_t bios_lock = SPIN_LOCK_UNLOCKED;
56
57 /*
58 * ******************************************
59 *
60 * Cleanup
61 *
62 * ******************************************
63 */
64
free_iomaps(void)65 static void free_iomaps(void)
66 {
67 unsigned long lastmapped=0;
68 unsigned int i;
69
70 /* We remember the last mapped area to be sure that we only iounmap
71 * every mapped area once. If two flash devices are in the same
72 * area but do not occur sequentially during probing you have a
73 * seriously strange hardware
74 */
75 for (i=0; i<flashcount; i++) {
76 if (lastmapped==flashdevices[i].mapped)
77 continue;
78 iounmap((void *)flashdevices[i].mapped);
79 lastmapped=flashdevices[i].mapped;
80 }
81 }
82
83 /*
84 * ******************************************
85 *
86 * Initialization
87 *
88 * ******************************************
89 */
90
probe_system(void)91 void probe_system(void)
92 {
93 #ifdef __alpha__
94 probe_alphafw();
95 #endif
96 /* This function checks all flash media attached to
97 * PCI devices in the system. This means NON-PCI systems
98 * don't work. This causes machine checks on my LX164 test
99 * machine, so leave it away until it's fixed. This is
100 * needed for Ruffians, so we check the machine type
101 * in probe_alphafw() and call probe_pcibus from there.
102 * This could use some cleanup
103 */
104 #ifndef __alpha__
105 probe_pcibus();
106 #endif
107 }
108
bios_init(void)109 static __init int bios_init(void)
110 {
111 printk(KERN_INFO "BIOS driver v" BIOS_VERSION " (writing %s) for "
112 UTS_RELEASE "\n", write?"enabled":"disabled");
113
114 #if !defined(UTC_BIOS) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
115 if (!pci_present()) {
116 printk(KERN_WARNING "BIOS: No PCI system.");
117 return -EBUSY;
118 }
119 #endif
120
121 /* Probe for flash devices */
122 probe_system();
123
124 if (flashcount==0) {
125 printk(KERN_WARNING "BIOS: No flash devices found.\n");
126 return -EBUSY;
127 }
128
129 if (register_chrdev(BIOS_MAJOR, "bios", &bios_fops) == -EBUSY) {
130 printk(KERN_WARNING "BIOS: Could not register bios device.\n");
131 free_iomaps();
132 return -EBUSY;
133 }
134
135 #ifdef CONFIG_PROC_FS
136 bios_proc_register();
137 #endif
138 return 0;
139 }
140
141 /*
142 * ******************************************
143 *
144 * module handling
145 *
146 * ******************************************
147 */
148
149 #ifdef MODULE
150 MODULE_PARM(write,"i");
151 MODULE_AUTHOR("Stefan Reinauer <stefan.reinauer@coreboot.org>");
152 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,4,10)
153 MODULE_LICENSE("GPL");
154 #endif
155
cleanup_bios_module(void)156 static __exit void cleanup_bios_module (void)
157 {
158 #ifdef CONFIG_PROC_FS
159 bios_proc_unregister();
160 #endif
161 free_iomaps();
162
163 unregister_chrdev(BIOS_MAJOR, "bios");
164 printk(KERN_INFO "BIOS driver removed.\n");
165 }
166
167 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
init_module(void)168 int init_module(void)
169 {
170 return bios_init();
171 }
172
cleanup_module(void)173 void cleanup_module(void)
174 {
175 cleanup_bios_module();
176 }
177 #endif
178
179 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,74)
180 module_init(bios_init);
181 module_exit(cleanup_bios_module);
182 #endif
183
inc_mod(void)184 void inc_mod(void)
185 {
186 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
187 MOD_INC_USE_COUNT;
188 #endif
189 }
190
dec_mod(void)191 void dec_mod(void)
192 {
193 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
194 MOD_DEC_USE_COUNT;
195 #endif
196 }
197
198 #endif
199