blob: 4c880e1de6103c9a45ccdb142855a29e1aa0bbd3 [file] [log] [blame]
/*
* OpenBIOS - free your system!
* ( firmware/flash device driver for Linux )
*
* bios_core.c - core skeleton
*
* This program is part of a free implementation of the IEEE 1275-1994
* Standard for Boot (Initialization Configuration) Firmware.
*
* Copyright (C) 1998-2004 Stefan Reinauer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*
*/
#include <linux/config.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
#ifdef MODULE
#ifdef MODVERSIONS
#include <linux/modversions.h>
#endif
#endif
#include <linux/module.h>
#endif
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <asm/io.h>
#include "bios.h"
#include "pcisets.h"
#include "flashchips.h"
#include "programming.h"
extern struct file_operations bios_fops;
int bios_proc_register(void);
int bios_proc_unregister(void);
int write = 0;
spinlock_t bios_lock = SPIN_LOCK_UNLOCKED;
/*
* ******************************************
*
* Cleanup
*
* ******************************************
*/
static void free_iomaps(void)
{
unsigned long lastmapped=0;
unsigned int i;
/* We remember the last mapped area to be sure that we only iounmap
* every mapped area once. If two flash devices are in the same
* area but do not occur sequentially during probing you have a
* seriously strange hardware
*/
for (i=0; i<flashcount; i++) {
if (lastmapped==flashdevices[i].mapped)
continue;
iounmap((void *)flashdevices[i].mapped);
lastmapped=flashdevices[i].mapped;
}
}
/*
* ******************************************
*
* Initialization
*
* ******************************************
*/
void probe_system(void)
{
#ifdef __alpha__
probe_alphafw();
#endif
/* This function checks all flash media attached to
* PCI devices in the system. This means NON-PCI systems
* don't work. This causes machine checks on my LX164 test
* machine, so leave it away until it's fixed. This is
* needed for Ruffians, so we check the machine type
* in probe_alphafw() and call probe_pcibus from there.
* This could use some cleanup
*/
#ifndef __alpha__
probe_pcibus();
#endif
}
static __init int bios_init(void)
{
printk(KERN_INFO "BIOS driver v" BIOS_VERSION " (writing %s) for "
UTS_RELEASE "\n", write?"enabled":"disabled");
#if !defined(UTC_BIOS) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
if (!pci_present()) {
printk(KERN_WARNING "BIOS: No PCI system.");
return -EBUSY;
}
#endif
/* Probe for flash devices */
probe_system();
if (flashcount==0) {
printk(KERN_WARNING "BIOS: No flash devices found.\n");
return -EBUSY;
}
if (register_chrdev(BIOS_MAJOR, "bios", &bios_fops) == -EBUSY) {
printk(KERN_WARNING "BIOS: Could not register bios device.\n");
free_iomaps();
return -EBUSY;
}
#ifdef CONFIG_PROC_FS
bios_proc_register();
#endif
return 0;
}
/*
* ******************************************
*
* module handling
*
* ******************************************
*/
#ifdef MODULE
MODULE_PARM(write,"i");
MODULE_AUTHOR("Stefan Reinauer <stefan.reinauer@coreboot.org>");
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,4,10)
MODULE_LICENSE("GPL");
#endif
static __exit void cleanup_bios_module (void)
{
#ifdef CONFIG_PROC_FS
bios_proc_unregister();
#endif
free_iomaps();
unregister_chrdev(BIOS_MAJOR, "bios");
printk(KERN_INFO "BIOS driver removed.\n");
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
int init_module(void)
{
return bios_init();
}
void cleanup_module(void)
{
cleanup_bios_module();
}
#endif
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,74)
module_init(bios_init);
module_exit(cleanup_bios_module);
#endif
void inc_mod(void)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
MOD_INC_USE_COUNT;
#endif
}
void dec_mod(void)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
MOD_DEC_USE_COUNT;
#endif
}
#endif