/*
* OpenBIOS - free your system!
* ( firmware/flash device driver for Linux )
*
* filesystem.c - vfs character device interface
*
* 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, <stepan@openbios.org>
*
* 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) && defined(MODVERSIONS)
#include <linux/modversions.h>
#endif
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/vmalloc.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include "bios.h"
#include "flashchips.h"
#include "pcisets.h"
#include "programming.h"
#ifdef MODULE
void inc_mod(void);
void dec_mod(void);
#endif
/*
* ******************************************
*
* /dev/bios filesystem operations
*
* ******************************************
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
#define FDEV (MINOR(file->f_dentry->d_inode->i_rdev))
#else
#define FDEV (iminor(file->f_dentry->d_inode))
#endif
#define CFLASH flashdevices[FDEV]
// #define BIOS_SIZE ((flashchips[CFLASH.flashnum].size)*1024)
#define BIOS_SIZE (CFLASH.size)
static loff_t bios_llseek(struct file *file, loff_t offset, int origin )
{
currflash=FDEV;
switch(origin) {
case 0:
break;
case 1:
offset += file->f_pos;
break;
case 2:
offset += BIOS_SIZE;
break;
}
return((offset >= 0)?(file->f_pos = offset):-EINVAL);
}
static ssize_t bios_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
{
signed int size=((BIOS_SIZE-*ppos>count) ? count : BIOS_SIZE-*ppos);
unsigned char *addr = (unsigned char*)CFLASH.mapped + CFLASH.offset;
int i;
currflash = FDEV;
devices[flashdevices[currflash].idx].activate();
for (i=0;i<size;i++)
buffer[i]=flash_readb(addr,*ppos+i);
devices[flashdevices[currflash].idx].deactivate();
*ppos+=size;
return size;
}
static ssize_t bios_write(struct file *file, const char *buffer, size_t count, loff_t *ppos)
{
unsigned long flags;
unsigned int offset=0, startsec=0, endsec=0;
unsigned int secnum=0, size=0, writeoffs=0;
unsigned int i, fn;
unsigned char *clipboard;
unsigned char *addr = (unsigned char*)CFLASH.mapped + CFLASH.offset;
currflash=FDEV;
fn=CFLASH.flashnum;
/* Some security checks. */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
if (!suser())
return -EACCES;
#endif
if (!write) {
printk (KERN_WARNING "Writing is disabled for security reasons. RTFM.\n");
return -EACCES;
}
if (!flashchips[fn].supported) {
printk (KERN_ERR "BIOS: Flash device not supported.\n");
return -EMEDIUMTYPE;
}
if ( count > BIOS_SIZE-*ppos )
return -EFBIG;
/* FIXME: Autoselect(AMD) BC-90
* -> 00/MID;
* 01/PID;
* 02/Protected (1=yes/0=no)
*/
/* Determine size of data to be written */
if (!(flashchips[fn].flags & f_needs_erase) ) {
offset=(unsigned int)*ppos&~(flashchips[fn].pagesize-1);
size=(((unsigned int)*ppos+count+(flashchips[fn].pagesize-1))&
~(flashchips[CFLASH.flashnum].pagesize-1))-offset;
} else {
while (flashchips[fn].sectors[secnum] <= flashchips[fn].size ) {
if ((unsigned int)*ppos >= flashchips[fn].sectors[secnum]*1024) {
offset=flashchips[fn].sectors[secnum]*1024;
startsec=secnum;
}
if ((unsigned int)*ppos+count-1 <= flashchips[fn].sectors[secnum]*1024) {
size=(flashchips[fn].sectors[secnum]*1024)-offset;
endsec=secnum-1;
break;
}
secnum++;
}
}
#ifdef DEBUG
printk (KERN_DEBUG "BIOS: Write [0x%06x..0x%06x] [0x%06x..0x%06x]\n",
(unsigned int)(*ppos),(unsigned int)(*ppos+count-1),offset,offset+size-1);
#endif
/* prepare data for writing */
clipboard=vmalloc(size);
spin_lock_irqsave(&bios_lock, flags);
devices[flashdevices[currflash].idx].activate();
for (i=0; i < size; i++)
clipboard[i] = flash_readb(addr,offset+i);
copy_from_user(clipboard+(*ppos-offset), buffer, count);
/* start write access */
if (flashchips[fn].flags & f_intel_compl) {
iflash_erase_sectors(addr,fn,startsec,endsec);
for (i=0;i<size;i++)
iflash_program_byte(addr, offset+i, clipboard[i]);
flash_command(addr, 0xff);
} else {
if (flashchips[fn].flags & f_needs_erase) {
if (size == flashchips[fn].size*1024) { /* whole chip erase */
printk (KERN_DEBUG "BIOS: Erasing via whole chip method\n");
flash_erase(addr, fn);
} else {
printk (KERN_DEBUG "BIOS: Erasing via sector method\n");
flash_erase_sectors(addr, fn,startsec,endsec);
}
}
while (size>0) {
if ((flashchips[fn].flags & f_manuf_compl) != f_atmel_compl) {
flash_program(addr);
} else {
flash_program_atmel(addr);
}
for (i=0;i<flashchips[fn].pagesize;i++) {
flash_writeb(addr,offset+writeoffs+i,clipboard[writeoffs+i]);
}
if ((flashchips[fn].flags & f_manuf_compl) == f_atmel_compl) {
udelay(750);
} else {
if (flashchips[fn].pagesize==1)
udelay(30);
else
udelay(300);
}
if (flash_ready_poll(addr,offset+writeoffs+flashchips[fn].pagesize-1,
clipboard[writeoffs+flashchips[fn].pagesize-1])) {
printk (KERN_ERR "BIOS: Error occured, please repeat write operation.\n");
}
flash_command(addr, 0xf0);
writeoffs += flashchips[fn].pagesize;
size -= flashchips[fn].pagesize;
}
}
devices[flashdevices[currflash].idx].deactivate();
spin_unlock_irqrestore(&bios_lock, flags);
vfree(clipboard);
*ppos+=count;
return count;
}
static int bios_open(struct inode *inode, struct file *file)
{
currflash=FDEV;
if (flashcount<=FDEV) {
printk (KERN_ERR "BIOS: There is no device (%d).\n",FDEV);
return -ENODEV;
}
#ifdef DEBUG
printk(KERN_DEBUG "BIOS: Opening device %d\n",FDEV);
#endif
/* Only one shall open for writing */
if ((CFLASH.open_cnt && (file->f_flags & O_EXCL)) ||
(CFLASH.open_mode & O_EXCL) ||
((file->f_mode & 2) && (CFLASH.open_mode & O_RDWR)))
return -EBUSY;
if (file->f_flags & O_EXCL)
CFLASH.open_mode |= O_EXCL;
if (file->f_mode & 2)
CFLASH.open_mode |= O_RDWR;
CFLASH.open_cnt++;
#ifdef MODULE
inc_mod();
#endif
return 0;
}
static int bios_release(struct inode *inode, struct file *file)
{
currflash=FDEV;
if (file->f_flags & O_EXCL)
CFLASH.open_mode &= ~O_EXCL;
if (file->f_mode & 2)
CFLASH.open_mode &= ~O_RDWR;
CFLASH.open_cnt--;
#ifdef MODULE
dec_mod();
#endif
return 0;
}
struct file_operations bios_fops = {
.owner = THIS_MODULE,
.llseek = bios_llseek,
.read = bios_read,
.write = bios_write,
.open = bios_open,
.release = bios_release,
};