From af1a266670d040d2f4083ff309d732d648afba2a Mon Sep 17 00:00:00 2001
From: Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com>
Date: Tue, 10 Oct 2023 14:33:42 +0000
Subject: Add submodule dependency files

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
---
 roms/openbios/utils/devbios/filesystem.c | 300 +++++++++++++++++++++++++++++++
 1 file changed, 300 insertions(+)
 create mode 100644 roms/openbios/utils/devbios/filesystem.c

(limited to 'roms/openbios/utils/devbios/filesystem.c')

diff --git a/roms/openbios/utils/devbios/filesystem.c b/roms/openbios/utils/devbios/filesystem.c
new file mode 100644
index 000000000..d76b182fe
--- /dev/null
+++ b/roms/openbios/utils/devbios/filesystem.c
@@ -0,0 +1,300 @@
+/*
+ *                     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
+ *
+ *  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 occurred, 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,
+};
+
-- 
cgit 1.2.3-korg