patch-2.1.66 linux/drivers/char/ftape/kernel-interface.c

• Lines: 359
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.1.65/linux/drivers/char/ftape/kernel-interface.c
• Orig date: Tue May 13 22:41:07 1997

diff -u --recursive --new-file v2.1.65/linux/drivers/char/ftape/kernel-interface.c linux/drivers/char/ftape/kernel-interface.c
@@ -1,358 +0,0 @@
-/*
- *      Copyright (C) 1993-1995 Bas Laarhoven.
-
- 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; either version 2, or (at your option)
- any later version.
-
- 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; see the file COPYING.  If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- *
- *      This file contains the code that interfaces the kernel
- *      for the QIC-40/80 floppy-tape driver for Linux.
- */
-
-#include <linux/module.h>
-#include <linux/version.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <asm/uaccess.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/major.h>
-#include <linux/malloc.h>
-#include <linux/init.h>
-#include <linux/ftape.h>
-#include <asm/dma.h>
-
-#include "tracing.h"
-#include "kernel-interface.h"
-#include "ftape-read.h"
-#include "ftape-write.h"
-#include "ftape-io.h"
-#include "ftape-ctl.h"
-#include "ftape-rw.h"
-#include "fdc-io.h"
-
-
-/*      Global vars.
- */
-
-/* Allocating a 96Kb DMAable buffer in one chunk won't work due to
- * memory fragmentation.  To avoid this, it is broken up into
- * NR_BUFFERS chunks of 32Kbyte. --khp
- */
-
-byte *tape_buffer[NR_BUFFERS] = {NULL};
-
-/*      Local vars.
- */
-static int busy_flag = 0;
-static int old_sigmask;
-
-static int ftape_open(struct inode *ino, struct file *filep);
-static int ftape_close(struct inode *ino, struct file *filep);
-static int ftape_ioctl(struct inode *ino, struct file *filep,
-		       unsigned int command, unsigned long arg);
-static long ftape_read(struct inode *ino, struct file *fp,
-		       char *buff, unsigned long req_len);
-static long ftape_write(struct inode *ino, struct file *fp,
-			const char *buff, unsigned long req_len);
-
-static struct file_operations ftape_cdev =
-{
-	NULL,			/* lseek */
-	ftape_read,		/* read */
-	ftape_write,		/* write */
-	NULL,			/* readdir */
-	NULL,			/* poll */
-	ftape_ioctl,		/* ioctl */
-	NULL,			/* mmap */
-	ftape_open,		/* open */
-	ftape_close,		/* release */
-	NULL,			/* fsync */
-};
-
-/*
- * DMA'able memory allocation stuff.
- */
-
-/* Pure 2^n version of get_order */
-static inline int __get_order(unsigned long size)
-{
-	int order;
-
-	size = (size-1) >> (PAGE_SHIFT-1);
-	order = -1;
-	do {
-		size >>= 1;
-		order++;
-	} while (size);
-	return order;
-}
-
-static inline
-void *dmaalloc(int order)
-{
-	return (void *) __get_dma_pages(GFP_KERNEL, order);
-}
-
-static inline
-void dmafree(void *addr, int order)
-{
-	free_pages((unsigned long) addr, order);
-}
-
-/*
- * Called by modules package when installing the driver
- * or by kernel during the initialization phase
- */
-
-#ifdef MODULE
-EXPORT_NO_SYMBOLS;
-#define ftape_init init_module
-#endif
-
-__initfunc(int ftape_init(void))
-{
-	int n;
-	int order;
-	TRACE_FUN(5, "ftape_init");
-#ifdef MODULE
-	printk(KERN_INFO "ftape-2.08 960314\n"
-	       KERN_INFO " (c) 1993-1995 Bas Laarhoven (bas@vimec.nl)\n"
-	       KERN_INFO " (c) 1995-1996 Kai Harrekilde-Petersen (khp@dolphinics.no)\n"
-	       KERN_INFO " QIC-117 driver for QIC-40/80/3010/3020 tape drives\n"
-	       KERN_INFO " Compiled for kernel version " UTS_RELEASE
-#ifdef MODVERSIONS
-	       " with versioned symbols"
-#endif
-	       "\n");
-#else /* !MODULE */
-	/* print a short no-nonsense boot message */
-	printk("ftape-2.08 960314 for Linux 1.3.70\n");
-#endif /* MODULE */
-	TRACE(3, "installing QIC-117 ftape driver...");
-	if (register_chrdev(QIC117_TAPE_MAJOR, "ft", &ftape_cdev)) {
-		TRACE(1, "register_chrdev failed");
-		TRACE_EXIT;
-		return -EIO;
-	}
-	TRACEx1(3, "ftape_init @ 0x%p", ftape_init);
-	/*
-	 * Allocate the DMA buffers. They are deallocated at cleanup() time.
-	 */
-	order = __get_order(BUFF_SIZE);
-	for (n = 0; n < NR_BUFFERS; n++) {
-		tape_buffer[n] = (byte *) dmaalloc(order);
-		if (!tape_buffer[n]) {
-			TRACE(1, "dmaalloc() failed");
-			for (n = 0; n < NR_BUFFERS; n++) {
-				if (tape_buffer[n]) {
-					dmafree(tape_buffer[n], order);
-					tape_buffer[n] = NULL;
-				}
-			}
-			current->blocked = old_sigmask;		/* restore mask */
-			if (unregister_chrdev(QIC117_TAPE_MAJOR, "ft") != 0) {
-				TRACE(3, "unregister_chrdev failed");
-			}
-			TRACE_EXIT;
-			return -ENOMEM;
-		} else {
-			TRACEx2(3, "dma-buffer #%d @ %p", n, tape_buffer[n]);
-		}
-	}
-	busy_flag = 0;
-	ftape_unit = -1;
-	ftape_failure = 1;	/* inhibit any operation but open */
-	udelay_calibrate();	/* must be before fdc_wait_calibrate ! */
-	fdc_wait_calibrate();
-	TRACE_EXIT;
-
-	return 0;
-}
-
-
-#ifdef MODULE
-/*      Called by modules package when removing the driver
- */
-void cleanup_module(void)
-{
-	int n;
-	int order;
-	TRACE_FUN(5, "cleanup_module");
-
-	if (unregister_chrdev(QIC117_TAPE_MAJOR, "ft") != 0) {
-		TRACE(3, "failed");
-	} else {
-		TRACE(3, "successful");
-	}
-	order = __get_order(BUFF_SIZE);
-	for (n = 0; n < NR_BUFFERS; n++) {
-		if (tape_buffer[n]) {
-			dmafree(tape_buffer[n], order);
-			tape_buffer[n] = NULL;
-			TRACEx1(3, "removed dma-buffer #%d", n);
-		} else {
-			TRACEx1(1, "dma-buffer #%d == NULL (bug?)", n);
-		}
-	}
-	TRACE_EXIT;
-}
-#endif				/* MODULE */
-
-/*      Open ftape device
- */
-static int ftape_open(struct inode *ino, struct file *filep)
-{
-	TRACE_FUN(4, "ftape_open");
-	int result;
-	MOD_INC_USE_COUNT;	/* lock module in memory */
-
-	TRACEi(5, "called for minor", MINOR(ino->i_rdev));
-	if (busy_flag) {
-		TRACE(1, "failed: already busy");
-		MOD_DEC_USE_COUNT;	/* unlock module in memory */
-		TRACE_EXIT;
-		return -EBUSY;
-	}
-	if ((MINOR(ino->i_rdev) & ~FTAPE_NO_REWIND) > 3) {
-		TRACE(1, "failed: illegal unit nr");
-		MOD_DEC_USE_COUNT;	/* unlock module in memory */
-		TRACE_EXIT;
-		return -ENXIO;
-	}
-	if (ftape_unit == -1 || FTAPE_UNIT != (MINOR(ino->i_rdev) & 3)) {
-		/*  Other selection than last time
-		 */
-		ftape_init_driver();
-	}
-	ftape_unit = MINOR(ino->i_rdev);
-	ftape_failure = 0;	/* allow tape operations */
-	old_sigmask = current->blocked;
-	current->blocked = _BLOCK_ALL;
-	fdc_save_drive_specs();	/* save Drive Specification regs on i82078-1's */
-	result = _ftape_open();
-	if (result < 0) {
-		TRACE(1, "_ftape_open failed");
-		current->blocked = old_sigmask;		/* restore mask */
-		MOD_DEC_USE_COUNT;	/* unlock module in memory */
-		TRACE_EXIT;
-		return result;
-	} else {
-		busy_flag = 1;
-		/*  Mask signals that will disturb proper operation of the
-		 *  program that is calling.
-		 */
-		current->blocked = old_sigmask | _DO_BLOCK;
-		TRACE_EXIT;
-		return 0;
-	}
-}
-
-/*      Close ftape device
- */
-static int ftape_close(struct inode *ino, struct file *filep)
-{
-	TRACE_FUN(4, "ftape_close");
-	int result;
-
-	if (!busy_flag || MINOR(ino->i_rdev) != ftape_unit) {
-		TRACE(1, "failed: not busy or wrong unit");
-		TRACE_EXIT;
-		return 0;		/* keep busy_flag !(?) */
-	}
-	current->blocked = _BLOCK_ALL;
-	result = _ftape_close();
-	if (result < 0) {
-		TRACE(1, "_ftape_close failed");
-	}
-	fdc_restore_drive_specs();	/* restore original values */
-	ftape_failure = 1;	/* inhibit any operation but open */
-	busy_flag = 0;
-	current->blocked = old_sigmask;		/* restore before open state */
-	TRACE_EXIT;
-	MOD_DEC_USE_COUNT;	/* unlock module in memory */
-	return 0;
-}
-
-/*      Ioctl for ftape device
- */
-static int ftape_ioctl(struct inode *ino, struct file *filep,
-		       unsigned int command, unsigned long arg)
-{
-	TRACE_FUN(4, "ftape_ioctl");
-	int result = -EIO;
-	int old_sigmask;
-
-	if (!busy_flag || MINOR(ino->i_rdev) != ftape_unit || ftape_failure) {
-		TRACE(1, "failed: not busy, failure or wrong unit");
-		TRACE_EXIT;
-		return -EIO;
-	}
-	old_sigmask = current->blocked;		/* save mask */
-	current->blocked = _BLOCK_ALL;
-	/* This will work as long as sizeof( void*) == sizeof( long)
-	 */
-	result = _ftape_ioctl(command, (void *) arg);
-	current->blocked = old_sigmask;		/* restore mask */
-	TRACE_EXIT;
-	return result;
-}
-
-/*      Read from tape device
- */
-static long ftape_read(struct inode *ino, struct file *fp,
-	char *buff, unsigned long req_len)
-{
-	TRACE_FUN(5, "ftape_read");
-	int result = -EIO;
-	int old_sigmask;
-
-	TRACEi(5, "called with count:", (int) req_len);
-	if (!busy_flag || MINOR(ino->i_rdev) != ftape_unit || ftape_failure) {
-		TRACE(1, "failed: not busy, failure or wrong unit");
-		TRACE_EXIT;
-		return -EIO;
-	}
-	old_sigmask = current->blocked;		/* save mask */
-	current->blocked = _BLOCK_ALL;
-	result = _ftape_read(buff, req_len);
-	TRACEi(7, "return with count:", result);
-	current->blocked = old_sigmask;		/* restore mask */
-	TRACE_EXIT;
-	return result;
-}
-
-/*      Write to tape device
- */
-static long ftape_write(struct inode *ino, struct file *fp,
-	const char *buff, unsigned long req_len)
-{
-	TRACE_FUN(8, "ftape_write");
-	int result = -EIO;
-	int old_sigmask;
-
-	TRACEi(5, "called with count:", (int) req_len);
-	if (!busy_flag || MINOR(ino->i_rdev) != ftape_unit || ftape_failure) {
-		TRACE(1, "failed: not busy, failure or wrong unit");
-		TRACE_EXIT;
-		return -EIO;
-	}
-	old_sigmask = current->blocked;		/* save mask */
-	current->blocked = _BLOCK_ALL;
-	result = _ftape_write(buff, req_len);
-	TRACEi(7, "return with count:", result);
-	current->blocked = old_sigmask;		/* restore mask */
-	TRACE_EXIT;
-	return result;
-}