![Ingo Molnar](/assets/img/avatar_default.png)
Clean up timer initialization by introducing DEFINE_TIMER a'la DEFINE_SPINLOCK. Build and boot-tested on x86. A similar patch has been been in the -RT tree for some time. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1605 lines
44 KiB
C
1605 lines
44 KiB
C
/*
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* linux/kernel/arch/arm/drivers/block/fd1772.c
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* Based on ataflop.c in the m68k Linux
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* Copyright (C) 1993 Greg Harp
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* Atari Support by Bjoern Brauel, Roman Hodek
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* Archimedes Support by Dave Gilbert (linux@treblig.org)
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*
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* Big cleanup Sep 11..14 1994 Roman Hodek:
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* - Driver now works interrupt driven
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* - Support for two drives; should work, but I cannot test that :-(
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* - Reading is done in whole tracks and buffered to speed up things
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* - Disk change detection and drive deselecting after motor-off
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* similar to TOS
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* - Autodetection of disk format (DD/HD); untested yet, because I
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* don't have an HD drive :-(
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*
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* Fixes Nov 13 1994 Martin Schaller:
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* - Autodetection works now
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* - Support for 5 1/4" disks
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* - Removed drive type (unknown on atari)
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* - Do seeks with 8 Mhz
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*
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* Changes by Andreas Schwab:
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* - After errors in multiple read mode try again reading single sectors
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* (Feb 1995):
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* - Clean up error handling
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* - Set blk_size for proper size checking
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* - Initialize track register when testing presence of floppy
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* - Implement some ioctl's
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*
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* Changes by Torsten Lang:
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* - When probing the floppies we should add the FDC1772CMDADD_H flag since
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* the FDC1772 will otherwise wait forever when no disk is inserted...
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*
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* Things left to do:
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* - Formatting
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* - Maybe a better strategy for disk change detection (does anyone
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* know one?)
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* - There are some strange problems left: The strangest one is
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* that, at least on my TT (4+4MB), the first 2 Bytes of the last
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* page of the TT-Ram (!) change their contents (some bits get
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* set) while a floppy DMA is going on. But there are no accesses
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* to these memory locations from the kernel... (I tested that by
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* making the page read-only). I cannot explain what's going on...
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* - Sometimes the drive-change-detection stops to work. The
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* function is still called, but the WP bit always reads as 0...
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* Maybe a problem with the status reg mode or a timing problem.
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* Note 10/12/94: The change detection now seems to work reliably.
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* There is no proof, but I've seen no hang for a long time...
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*
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* ARCHIMEDES changes: (gilbertd@cs.man.ac.uk)
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* 26/12/95 - Changed all names starting with FDC to FDC1772
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* Removed all references to clock speed of FDC - we're stuck with 8MHz
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* Modified disk_type structure to remove HD formats
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*
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* 7/ 1/96 - Wrote FIQ code, removed most remaining atariisms
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*
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* 13/ 1/96 - Well I think its read a single sector; but there is a problem
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* fd_rwsec_done which is called in FIQ mode starts another transfer
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* off (in fd_rwsec) while still in FIQ mode. Because its still in
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* FIQ mode it can't service the DMA and loses data. So need to
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* heavily restructure.
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* 14/ 1/96 - Found that the definitions of the register numbers of the
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* FDC were multiplied by 2 in the header for the 16bit words
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* of the atari so half the writes were going in the wrong place.
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* Also realised that the FIQ entry didn't make any attempt to
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* preserve registers or return correctly; now in assembler.
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*
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* 11/ 2/96 - Hmm - doesn't work on real machine. Auto detect doesn't
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* and hacking that past seems to wait forever - check motor
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* being turned on.
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*
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* 17/ 2/96 - still having problems - forcing track to -1 when selecting
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* new drives seems to allow it to read first few sectors
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* but then we get solid hangs at apparently random places
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* which change depending what is happening.
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*
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* 9/ 3/96 - Fiddled a lot of stuff around to move to kernel 1.3.35
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* A lot of fiddling in DMA stuff. Having problems with it
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* constnatly thinking its timeing out. Ah - its timeout
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* was set to (6*HZ) rather than jiffies+(6*HZ). Now giving
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* duff data!
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*
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* 5/ 4/96 - Made it use the new IOC_ macros rather than *ioc
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* Hmm - giving unexpected FIQ and then timeouts
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* 18/ 8/96 - Ran through indent -kr -i8
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* Some changes to disc change detect; don't know how well it
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* works.
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* 24/ 8/96 - Put all the track buffering code back in from the atari
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* code - I wonder if it will still work... No :-)
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* Still works if I turn off track buffering.
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* 25/ 8/96 - Changed the timer expires that I'd added back to be
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* jiffies + ....; and it all sprang to life! Got 2.8K/sec
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* off a cp -r of a 679K disc (showed 94% cpu usage!)
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* (PC gets 14.3K/sec - 0% CPU!) Hmm - hard drive corrupt!
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* Also perhaps that compile was with cache off.
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* changed cli in fd_readtrack_check to cliIF
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* changed vmallocs to kmalloc (whats the difference!!)
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* Removed the busy wait loop in do_fd_request and replaced
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* by a routine on tq_immediate; only 11% cpu on a dd off the
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* raw disc - but the speed is the same.
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* 1/ 9/96 - Idea (failed!) - set the 'disable spin-up sequence'
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* when we read the track if we know the motor is on; didn't
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* help - perhaps we have to do it in stepping as well.
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* Nope. Still doesn't help.
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* Hmm - what seems to be happening is that fd_readtrack_check
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* is never getting called. Its job is to terminate the read
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* just after we think we should have got the data; otherwise
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* the fdc takes 1 second to timeout; which is what's happening
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* Now I can see 'readtrack_timer' being set (which should do the
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* call); but it never seems to be called - hmm!
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* OK - I've moved the check to my tq_immediate code -
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* and it WORKS! 13.95K/second at 19% CPU.
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* I wish I knew why that timer didn't work.....
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*
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* 16/11/96 - Fiddled and frigged for 2.0.18
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*
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* DAG 30/01/99 - Started frobbing for 2.2.1
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* DAG 20/06/99 - A little more frobbing:
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* Included include/asm/uaccess.h for get_user/put_user
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*
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* DAG 1/09/00 - Dusted off for 2.4.0-test7
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* MAX_SECTORS was name clashing so it is now FD1772_...
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* Minor parameter, name layouts for 2.4.x differences
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*/
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/fcntl.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <linux/fd.h>
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#include <linux/fd1772.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <linux/bitops.h>
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#include <asm/arch/oldlatches.h>
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#include <asm/dma.h>
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#include <asm/hardware.h>
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#include <asm/hardware/ioc.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/mach-types.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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/* Note: FD_MAX_UNITS could be redefined to 2 for the Atari (with
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* little additional rework in this file). But I'm not yet sure if
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* some other code depends on the number of floppies... (It is defined
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* in a public header!)
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*/
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#if 0
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#undef FD_MAX_UNITS
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#define FD_MAX_UNITS 2
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#endif
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/* Ditto worries for Arc - DAG */
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#define FD_MAX_UNITS 4
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#define TRACKBUFFER 0
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/*#define DEBUG*/
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#ifdef DEBUG
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#define DPRINT(a) printk a
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#else
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#define DPRINT(a)
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#endif
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static struct request_queue *floppy_queue;
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#define MAJOR_NR FLOPPY_MAJOR
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#define FLOPPY_DMA 0
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#define DEVICE_NAME "floppy"
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#define QUEUE (floppy_queue)
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#define CURRENT elv_next_request(floppy_queue)
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/* Disk types: DD */
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static struct archy_disk_type {
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const char *name;
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unsigned spt; /* sectors per track */
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unsigned blocks; /* total number of blocks */
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unsigned stretch; /* track doubling ? */
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} disk_type[] = {
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{ "d360", 9, 720, 0 }, /* 360kB diskette */
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{ "D360", 9, 720, 1 }, /* 360kb in 720kb drive */
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{ "D720", 9, 1440, 0 }, /* 720kb diskette (DD) */
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/*{ "D820", 10,1640, 0}, *//* DD disk with 82 tracks/10 sectors
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- DAG - can't see how type detect can distinguish this
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from 720K until it reads block 4 by which time its too late! */
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};
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#define NUM_DISK_TYPES (sizeof(disk_type)/sizeof(*disk_type))
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/*
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* Maximum disk size (in kilobytes). This default is used whenever the
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* current disk size is unknown.
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*/
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#define MAX_DISK_SIZE 720
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static struct gendisk *disks[FD_MAX_UNIT];
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/* current info on each unit */
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static struct archy_floppy_struct {
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int connected; /* !=0 : drive is connected */
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int autoprobe; /* !=0 : do autoprobe */
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struct archy_disk_type *disktype; /* current type of disk */
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int track; /* current head position or -1
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* if unknown */
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unsigned int steprate; /* steprate setting */
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unsigned int wpstat; /* current state of WP signal
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* (for disk change detection) */
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} unit[FD_MAX_UNITS];
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/* DAG: On Arc we spin on a flag being cleared by fdc1772_comendhandler which
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is an assembler routine */
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extern void fdc1772_comendhandler(void); /* Actually doens't have these parameters - see fd1772.S */
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extern volatile int fdc1772_comendstatus;
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extern volatile int fdc1772_fdc_int_done;
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#define FDC1772BASE ((0x210000>>2)|0x80000000)
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#define FDC1772_READ(reg) inb(FDC1772BASE+(reg/2))
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/* DAG: You wouldn't be silly to ask why FDC1772_WRITE is a function rather
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than the #def below - well simple - the #def won't compile - and I
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don't understand why (__outwc not defined) */
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/* NOTE: Reg is 0,2,4,6 as opposed to 0,1,2,3 or 0,4,8,12 to keep compatibility
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with the ST version of fd1772.h */
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/*#define FDC1772_WRITE(reg,val) outw(val,(reg+FDC1772BASE)); */
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void FDC1772_WRITE(int reg, unsigned char val)
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{
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if (reg == FDC1772REG_CMD) {
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DPRINT(("FDC1772_WRITE new command 0x%x @ %d\n", val,jiffies));
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if (fdc1772_fdc_int_done) {
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DPRINT(("FDC1772_WRITE: Hmm fdc1772_fdc_int_done true - resetting\n"));
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fdc1772_fdc_int_done = 0;
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};
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};
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outb(val, (reg / 2) + FDC1772BASE);
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};
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#define FD1772_MAX_SECTORS 22
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unsigned char *DMABuffer; /* buffer for writes */
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/*static unsigned long PhysDMABuffer; *//* physical address */
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/* DAG: On Arc we just go straight for the DMA buffer */
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#define PhysDMABuffer DMABuffer
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#ifdef TRACKBUFFER
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unsigned char *TrackBuffer; /* buffer for reads */
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#define PhysTrackBuffer TrackBuffer /* physical address */
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static int BufferDrive, BufferSide, BufferTrack;
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static int read_track; /* non-zero if we are reading whole tracks */
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#define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512)
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#define IS_BUFFERED(drive,side,track) \
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(BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))
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#endif
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/*
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* These are global variables, as that's the easiest way to give
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* information to interrupts. They are the data used for the current
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* request.
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*/
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static int SelectedDrive = 0;
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static int ReqCmd, ReqBlock;
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static int ReqSide, ReqTrack, ReqSector, ReqCnt;
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static int HeadSettleFlag = 0;
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static unsigned char *ReqData, *ReqBuffer;
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static int MotorOn = 0, MotorOffTrys;
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/* Synchronization of FDC1772 access. */
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static volatile int fdc_busy = 0;
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static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
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/* long req'd for set_bit --RR */
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static unsigned long changed_floppies = 0xff, fake_change = 0;
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#define CHECK_CHANGE_DELAY HZ/2
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/* DAG - increased to 30*HZ - not sure if this is the correct thing to do */
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#define FD_MOTOR_OFF_DELAY (10*HZ)
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#define FD_MOTOR_OFF_MAXTRY (10*20)
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#define FLOPPY_TIMEOUT (6*HZ)
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#define RECALIBRATE_ERRORS 4 /* After this many errors the drive
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* will be recalibrated. */
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#define MAX_ERRORS 8 /* After this many errors the driver
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* will give up. */
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#define START_MOTOR_OFF_TIMER(delay) \
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do { \
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motor_off_timer.expires = jiffies + (delay); \
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add_timer( &motor_off_timer ); \
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MotorOffTrys = 0; \
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} while(0)
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#define START_CHECK_CHANGE_TIMER(delay) \
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do { \
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mod_timer(&fd_timer, jiffies + (delay)); \
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} while(0)
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#define START_TIMEOUT() \
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do { \
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mod_timer(&timeout_timer, jiffies+FLOPPY_TIMEOUT); \
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} while(0)
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#define STOP_TIMEOUT() \
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do { \
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del_timer( &timeout_timer ); \
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} while(0)
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#define ENABLE_IRQ() enable_irq(FIQ_FD1772+64);
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#define DISABLE_IRQ() disable_irq(FIQ_FD1772+64);
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static void fd1772_checkint(void);
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DECLARE_WORK(fd1772_tq, (void *)fd1772_checkint, NULL);
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/*
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* The driver is trying to determine the correct media format
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* while Probing is set. fd_rwsec_done() clears it after a
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* successful access.
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*/
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static int Probing = 0;
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/* This flag is set when a dummy seek is necessary to make the WP
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* status bit accessible.
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*/
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static int NeedSeek = 0;
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/***************************** Prototypes *****************************/
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static void fd_select_side(int side);
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static void fd_select_drive(int drive);
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static void fd_deselect(void);
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static void fd_motor_off_timer(unsigned long dummy);
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static void check_change(unsigned long dummy);
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static void floppy_irqconsequencehandler(void);
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static void fd_error(void);
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static void do_fd_action(int drive);
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static void fd_calibrate(void);
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static void fd_calibrate_done(int status);
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static void fd_seek(void);
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static void fd_seek_done(int status);
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static void fd_rwsec(void);
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#ifdef TRACKBUFFER
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static void fd_readtrack_check( unsigned long dummy );
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#endif
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static void fd_rwsec_done(int status);
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static void fd_times_out(unsigned long dummy);
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static void finish_fdc(void);
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static void finish_fdc_done(int dummy);
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static void floppy_off(unsigned int nr);
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static void setup_req_params(int drive);
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static void redo_fd_request(void);
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static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int
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cmd, unsigned long param);
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static void fd_probe(int drive);
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static int fd_test_drive_present(int drive);
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static void config_types(void);
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static int floppy_open(struct inode *inode, struct file *filp);
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static int floppy_release(struct inode *inode, struct file *filp);
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static void do_fd_request(request_queue_t *);
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/************************* End of Prototypes **************************/
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static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer, 0, 0);
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#ifdef TRACKBUFFER
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static DEFINE_TIMER(readtrack_timer, fd_readtrack_check, 0, 0);
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#endif
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static DEFINE_TIMER(timeout_timer, fd_times_out, 0, 0);
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static DEFINE_TIMER(fd_timer, check_change, 0, 0);
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/* DAG: Haven't got a clue what this is? */
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int stdma_islocked(void)
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{
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return 0;
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};
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/* Select the side to use. */
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static void fd_select_side(int side)
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{
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oldlatch_aupdate(LATCHA_SIDESEL, side ? 0 : LATCHA_SIDESEL);
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}
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/* Select a drive, update the FDC1772's track register
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*/
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static void fd_select_drive(int drive)
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{
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#ifdef DEBUG
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printk("fd_select_drive:%d\n", drive);
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#endif
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/* Hmm - nowhere do we seem to turn the motor on - I'm going to do it here! */
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oldlatch_aupdate(LATCHA_MOTOR | LATCHA_INUSE, 0);
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if (drive == SelectedDrive)
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return;
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oldlatch_aupdate(LATCHA_FDSELALL, 0xf - (1 << drive));
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/* restore track register to saved value */
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FDC1772_WRITE(FDC1772REG_TRACK, unit[drive].track);
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udelay(25);
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SelectedDrive = drive;
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}
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/* Deselect both drives. */
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static void fd_deselect(void)
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{
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unsigned long flags;
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DPRINT(("fd_deselect\n"));
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oldlatch_aupdate(LATCHA_FDSELALL | LATCHA_MOTOR | LATCHA_INUSE, 0xf | LATCHA_MOTOR | LATCHA_INUSE);
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SelectedDrive = -1;
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}
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/* This timer function deselects the drives when the FDC1772 switched the
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* motor off. The deselection cannot happen earlier because the FDC1772
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* counts the index signals, which arrive only if one drive is selected.
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*/
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static void fd_motor_off_timer(unsigned long dummy)
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{
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unsigned long flags;
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unsigned char status;
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int delay;
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del_timer(&motor_off_timer);
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if (SelectedDrive < 0)
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/* no drive selected, needn't deselect anyone */
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return;
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save_flags(flags);
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cli();
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if (fdc_busy) /* was stdma_islocked */
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goto retry;
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status = FDC1772_READ(FDC1772REG_STATUS);
|
|
|
|
if (!(status & 0x80)) {
|
|
/*
|
|
* motor already turned off by FDC1772 -> deselect drives
|
|
* In actual fact its this deselection which turns the motor
|
|
* off on the Arc, since the motor control is actually on
|
|
* Latch A
|
|
*/
|
|
DPRINT(("fdc1772: deselecting in fd_motor_off_timer\n"));
|
|
fd_deselect();
|
|
MotorOn = 0;
|
|
restore_flags(flags);
|
|
return;
|
|
}
|
|
/* not yet off, try again */
|
|
|
|
retry:
|
|
restore_flags(flags);
|
|
/* Test again later; if tested too often, it seems there is no disk
|
|
* in the drive and the FDC1772 will leave the motor on forever (or,
|
|
* at least until a disk is inserted). So we'll test only twice
|
|
* per second from then on...
|
|
*/
|
|
delay = (MotorOffTrys < FD_MOTOR_OFF_MAXTRY) ?
|
|
(++MotorOffTrys, HZ / 20) : HZ / 2;
|
|
START_MOTOR_OFF_TIMER(delay);
|
|
}
|
|
|
|
|
|
/* This function is repeatedly called to detect disk changes (as good
|
|
* as possible) and keep track of the current state of the write protection.
|
|
*/
|
|
|
|
static void check_change(unsigned long dummy)
|
|
{
|
|
static int drive = 0;
|
|
|
|
unsigned long flags;
|
|
int stat;
|
|
|
|
if (fdc_busy)
|
|
return; /* Don't start poking about if the fdc is busy */
|
|
|
|
return; /* let's just forget it for the mo DAG */
|
|
|
|
if (++drive > 1 || !unit[drive].connected)
|
|
drive = 0;
|
|
|
|
save_flags(flags);
|
|
cli();
|
|
|
|
if (!stdma_islocked()) {
|
|
stat = !!(FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_WPROT);
|
|
|
|
/* The idea here is that if the write protect line has changed then
|
|
the disc must have changed */
|
|
if (stat != unit[drive].wpstat) {
|
|
DPRINT(("wpstat[%d] = %d\n", drive, stat));
|
|
unit[drive].wpstat = stat;
|
|
set_bit(drive, &changed_floppies);
|
|
}
|
|
}
|
|
restore_flags(flags);
|
|
|
|
START_CHECK_CHANGE_TIMER(CHECK_CHANGE_DELAY);
|
|
}
|
|
|
|
|
|
/* Handling of the Head Settling Flag: This flag should be set after each
|
|
* seek operation, because we don't use seeks with verify.
|
|
*/
|
|
|
|
static inline void set_head_settle_flag(void)
|
|
{
|
|
HeadSettleFlag = FDC1772CMDADD_E;
|
|
}
|
|
|
|
static inline int get_head_settle_flag(void)
|
|
{
|
|
int tmp = HeadSettleFlag;
|
|
HeadSettleFlag = 0;
|
|
return (tmp);
|
|
}
|
|
|
|
|
|
|
|
|
|
/* General Interrupt Handling */
|
|
|
|
static inline void copy_buffer(void *from, void *to)
|
|
{
|
|
ulong *p1 = (ulong *) from, *p2 = (ulong *) to;
|
|
int cnt;
|
|
|
|
for (cnt = 512 / 4; cnt; cnt--)
|
|
*p2++ = *p1++;
|
|
}
|
|
|
|
static void (*FloppyIRQHandler) (int status) = NULL;
|
|
|
|
static void floppy_irqconsequencehandler(void)
|
|
{
|
|
unsigned char status;
|
|
void (*handler) (int);
|
|
|
|
fdc1772_fdc_int_done = 0;
|
|
|
|
handler = FloppyIRQHandler;
|
|
FloppyIRQHandler = NULL;
|
|
|
|
if (handler) {
|
|
nop();
|
|
status = (unsigned char) fdc1772_comendstatus;
|
|
DPRINT(("FDC1772 irq, status = %02x handler = %08lx\n", (unsigned int) status, (unsigned long) handler));
|
|
handler(status);
|
|
} else {
|
|
DPRINT(("FDC1772 irq, no handler status=%02x\n", fdc1772_comendstatus));
|
|
}
|
|
DPRINT(("FDC1772 irq: end of floppy_irq\n"));
|
|
}
|
|
|
|
|
|
/* Error handling: If some error happened, retry some times, then
|
|
* recalibrate, then try again, and fail after MAX_ERRORS.
|
|
*/
|
|
|
|
static void fd_error(void)
|
|
{
|
|
printk("FDC1772: fd_error\n");
|
|
/*panic("fd1772: fd_error"); *//* DAG tmp */
|
|
if (!CURRENT)
|
|
return;
|
|
CURRENT->errors++;
|
|
if (CURRENT->errors >= MAX_ERRORS) {
|
|
printk("fd%d: too many errors.\n", SelectedDrive);
|
|
end_request(CURRENT, 0);
|
|
} else if (CURRENT->errors == RECALIBRATE_ERRORS) {
|
|
printk("fd%d: recalibrating\n", SelectedDrive);
|
|
if (SelectedDrive != -1)
|
|
unit[SelectedDrive].track = -1;
|
|
}
|
|
redo_fd_request();
|
|
}
|
|
|
|
|
|
|
|
#define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)
|
|
|
|
|
|
/* do_fd_action() is the general procedure for a fd request: All
|
|
* required parameter settings (drive select, side select, track
|
|
* position) are checked and set if needed. For each of these
|
|
* parameters and the actual reading or writing exist two functions:
|
|
* one that starts the setting (or skips it if possible) and one
|
|
* callback for the "done" interrupt. Each done func calls the next
|
|
* set function to propagate the request down to fd_rwsec_done().
|
|
*/
|
|
|
|
static void do_fd_action(int drive)
|
|
{
|
|
struct request *req;
|
|
DPRINT(("do_fd_action unit[drive].track=%d\n", unit[drive].track));
|
|
|
|
#ifdef TRACKBUFFER
|
|
repeat:
|
|
|
|
if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
|
|
req = CURRENT;
|
|
if (ReqCmd == READ) {
|
|
copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
|
|
if (++ReqCnt < req->current_nr_sectors) {
|
|
/* read next sector */
|
|
setup_req_params( drive );
|
|
goto repeat;
|
|
} else {
|
|
/* all sectors finished */
|
|
req->nr_sectors -= req->current_nr_sectors;
|
|
req->sector += req->current_nr_sectors;
|
|
end_request(req, 1);
|
|
redo_fd_request();
|
|
return;
|
|
}
|
|
} else {
|
|
/* cmd == WRITE, pay attention to track buffer
|
|
* consistency! */
|
|
copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (SelectedDrive != drive) {
|
|
/*unit[drive].track = -1; DAG */
|
|
fd_select_drive(drive);
|
|
};
|
|
|
|
|
|
if (unit[drive].track == -1)
|
|
fd_calibrate();
|
|
else if (unit[drive].track != ReqTrack << unit[drive].disktype->stretch)
|
|
fd_seek();
|
|
else
|
|
fd_rwsec();
|
|
}
|
|
|
|
|
|
/* Seek to track 0 if the current track is unknown */
|
|
|
|
static void fd_calibrate(void)
|
|
{
|
|
DPRINT(("fd_calibrate\n"));
|
|
if (unit[SelectedDrive].track >= 0) {
|
|
fd_calibrate_done(0);
|
|
return;
|
|
}
|
|
DPRINT(("fd_calibrate (after track compare)\n"));
|
|
SET_IRQ_HANDLER(fd_calibrate_done);
|
|
/* we can't verify, since the speed may be incorrect */
|
|
FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | unit[SelectedDrive].steprate);
|
|
|
|
NeedSeek = 1;
|
|
MotorOn = 1;
|
|
START_TIMEOUT();
|
|
/* wait for IRQ */
|
|
}
|
|
|
|
|
|
static void fd_calibrate_done(int status)
|
|
{
|
|
DPRINT(("fd_calibrate_done()\n"));
|
|
STOP_TIMEOUT();
|
|
|
|
/* set the correct speed now */
|
|
if (status & FDC1772STAT_RECNF) {
|
|
printk("fd%d: restore failed\n", SelectedDrive);
|
|
fd_error();
|
|
} else {
|
|
unit[SelectedDrive].track = 0;
|
|
fd_seek();
|
|
}
|
|
}
|
|
|
|
|
|
/* Seek the drive to the requested track. The drive must have been
|
|
* calibrated at some point before this.
|
|
*/
|
|
|
|
static void fd_seek(void)
|
|
{
|
|
unsigned long flags;
|
|
DPRINT(("fd_seek() to track %d (unit[SelectedDrive].track=%d)\n", ReqTrack,
|
|
unit[SelectedDrive].track));
|
|
if (unit[SelectedDrive].track == ReqTrack <<
|
|
unit[SelectedDrive].disktype->stretch) {
|
|
fd_seek_done(0);
|
|
return;
|
|
}
|
|
FDC1772_WRITE(FDC1772REG_DATA, ReqTrack <<
|
|
unit[SelectedDrive].disktype->stretch);
|
|
udelay(25);
|
|
save_flags(flags);
|
|
clf();
|
|
SET_IRQ_HANDLER(fd_seek_done);
|
|
FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK | unit[SelectedDrive].steprate |
|
|
/* DAG */
|
|
(MotorOn?FDC1772CMDADD_H:0));
|
|
|
|
restore_flags(flags);
|
|
MotorOn = 1;
|
|
set_head_settle_flag();
|
|
START_TIMEOUT();
|
|
/* wait for IRQ */
|
|
}
|
|
|
|
|
|
static void fd_seek_done(int status)
|
|
{
|
|
DPRINT(("fd_seek_done()\n"));
|
|
STOP_TIMEOUT();
|
|
|
|
/* set the correct speed */
|
|
if (status & FDC1772STAT_RECNF) {
|
|
printk("fd%d: seek error (to track %d)\n",
|
|
SelectedDrive, ReqTrack);
|
|
/* we don't know exactly which track we are on now! */
|
|
unit[SelectedDrive].track = -1;
|
|
fd_error();
|
|
} else {
|
|
unit[SelectedDrive].track = ReqTrack <<
|
|
unit[SelectedDrive].disktype->stretch;
|
|
NeedSeek = 0;
|
|
fd_rwsec();
|
|
}
|
|
}
|
|
|
|
|
|
/* This does the actual reading/writing after positioning the head
|
|
* over the correct track.
|
|
*/
|
|
|
|
#ifdef TRACKBUFFER
|
|
static int MultReadInProgress = 0;
|
|
#endif
|
|
|
|
|
|
static void fd_rwsec(void)
|
|
{
|
|
unsigned long paddr, flags;
|
|
unsigned int rwflag, old_motoron;
|
|
unsigned int track;
|
|
|
|
DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n", ReqSector, ReqCmd == WRITE ? 'w' : 'r'));
|
|
if (ReqCmd == WRITE) {
|
|
/*cache_push( (unsigned long)ReqData, 512 ); */
|
|
paddr = (unsigned long) ReqData;
|
|
rwflag = 0x100;
|
|
} else {
|
|
paddr = (unsigned long) PhysDMABuffer;
|
|
#ifdef TRACKBUFFER
|
|
if (read_track)
|
|
paddr = (unsigned long)PhysTrackBuffer;
|
|
#endif
|
|
rwflag = 0;
|
|
}
|
|
|
|
DPRINT(("fd_rwsec() before sidesel rwflag=%d sec=%d trk=%d\n", rwflag,
|
|
ReqSector, FDC1772_READ(FDC1772REG_TRACK)));
|
|
fd_select_side(ReqSide);
|
|
|
|
/*DPRINT(("fd_rwsec() before start sector \n")); */
|
|
/* Start sector of this operation */
|
|
#ifdef TRACKBUFFER
|
|
FDC1772_WRITE( FDC1772REG_SECTOR, !read_track ? ReqSector : 1 );
|
|
#else
|
|
FDC1772_WRITE( FDC1772REG_SECTOR, ReqSector );
|
|
#endif
|
|
|
|
/* Cheat for track if stretch != 0 */
|
|
if (unit[SelectedDrive].disktype->stretch) {
|
|
track = FDC1772_READ(FDC1772REG_TRACK);
|
|
FDC1772_WRITE(FDC1772REG_TRACK, track >>
|
|
unit[SelectedDrive].disktype->stretch);
|
|
}
|
|
udelay(25);
|
|
|
|
DPRINT(("fd_rwsec() before setup DMA \n"));
|
|
/* Setup DMA - Heavily modified by DAG */
|
|
save_flags(flags);
|
|
clf();
|
|
disable_dma(FLOPPY_DMA);
|
|
set_dma_mode(FLOPPY_DMA, rwflag ? DMA_MODE_WRITE : DMA_MODE_READ);
|
|
set_dma_addr(FLOPPY_DMA, (long) paddr); /* DAG - changed from Atari specific */
|
|
#ifdef TRACKBUFFER
|
|
set_dma_count(FLOPPY_DMA,(!read_track ? 1 : unit[SelectedDrive].disktype->spt)*512);
|
|
#else
|
|
set_dma_count(FLOPPY_DMA, 512); /* Block/sector size - going to have to change */
|
|
#endif
|
|
SET_IRQ_HANDLER(fd_rwsec_done);
|
|
/* Turn on dma int */
|
|
enable_dma(FLOPPY_DMA);
|
|
/* Now give it something to do */
|
|
FDC1772_WRITE(FDC1772REG_CMD, (rwflag ? (FDC1772CMD_WRSEC | FDC1772CMDADD_P) :
|
|
#ifdef TRACKBUFFER
|
|
(FDC1772CMD_RDSEC | (read_track ? FDC1772CMDADD_M : 0) |
|
|
/* Hmm - the idea here is to stop the FDC spinning the disc
|
|
up when we know that we already still have it spinning */
|
|
(MotorOn?FDC1772CMDADD_H:0))
|
|
#else
|
|
FDC1772CMD_RDSEC
|
|
#endif
|
|
));
|
|
|
|
restore_flags(flags);
|
|
DPRINT(("fd_rwsec() after DMA setup flags=0x%08x\n", flags));
|
|
/*sti(); *//* DAG - Hmm */
|
|
/* Hmm - should do something DAG */
|
|
old_motoron = MotorOn;
|
|
MotorOn = 1;
|
|
NeedSeek = 1;
|
|
|
|
/* wait for interrupt */
|
|
|
|
#ifdef TRACKBUFFER
|
|
if (read_track) {
|
|
/*
|
|
* If reading a whole track, wait about one disk rotation and
|
|
* then check if all sectors are read. The FDC will even
|
|
* search for the first non-existant sector and need 1 sec to
|
|
* recognise that it isn't present :-(
|
|
*/
|
|
/* 1 rot. + 5 rot.s if motor was off */
|
|
mod_timer(&readtrack_timer, jiffies + HZ/5 + (old_motoron ? 0 : HZ));
|
|
DPRINT(("Setting readtrack_timer to %d @ %d\n",
|
|
readtrack_timer.expires,jiffies));
|
|
MultReadInProgress = 1;
|
|
}
|
|
#endif
|
|
|
|
/*DPRINT(("fd_rwsec() before START_TIMEOUT \n")); */
|
|
START_TIMEOUT();
|
|
/*DPRINT(("fd_rwsec() after START_TIMEOUT \n")); */
|
|
}
|
|
|
|
|
|
#ifdef TRACKBUFFER
|
|
|
|
static void fd_readtrack_check(unsigned long dummy)
|
|
{
|
|
unsigned long flags, addr;
|
|
extern unsigned char *fdc1772_dataaddr;
|
|
|
|
DPRINT(("fd_readtrack_check @ %d\n",jiffies));
|
|
|
|
save_flags(flags);
|
|
clf();
|
|
|
|
del_timer( &readtrack_timer );
|
|
|
|
if (!MultReadInProgress) {
|
|
/* This prevents a race condition that could arise if the
|
|
* interrupt is triggered while the calling of this timer
|
|
* callback function takes place. The IRQ function then has
|
|
* already cleared 'MultReadInProgress' when control flow
|
|
* gets here.
|
|
*/
|
|
restore_flags(flags);
|
|
return;
|
|
}
|
|
|
|
/* get the current DMA address */
|
|
addr=(unsigned long)fdc1772_dataaddr; /* DAG - ? */
|
|
DPRINT(("fd_readtrack_check: addr=%x PhysTrackBuffer=%x\n",addr,PhysTrackBuffer));
|
|
|
|
if (addr >= (unsigned int)PhysTrackBuffer + unit[SelectedDrive].disktype->spt*512) {
|
|
/* already read enough data, force an FDC interrupt to stop
|
|
* the read operation
|
|
*/
|
|
SET_IRQ_HANDLER( NULL );
|
|
restore_flags(flags);
|
|
DPRINT(("fd_readtrack_check(): done\n"));
|
|
FDC1772_WRITE( FDC1772REG_CMD, FDC1772CMD_FORCI );
|
|
udelay(25);
|
|
|
|
/* No error until now -- the FDC would have interrupted
|
|
* otherwise!
|
|
*/
|
|
fd_rwsec_done( 0 );
|
|
} else {
|
|
/* not yet finished, wait another tenth rotation */
|
|
restore_flags(flags);
|
|
DPRINT(("fd_readtrack_check(): not yet finished\n"));
|
|
readtrack_timer.expires = jiffies + HZ/5/10;
|
|
add_timer( &readtrack_timer );
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
static void fd_rwsec_done(int status)
|
|
{
|
|
unsigned int track;
|
|
|
|
DPRINT(("fd_rwsec_done() status=%d @ %d\n", status,jiffies));
|
|
|
|
#ifdef TRACKBUFFER
|
|
if (read_track && !MultReadInProgress)
|
|
return;
|
|
|
|
MultReadInProgress = 0;
|
|
|
|
STOP_TIMEOUT();
|
|
|
|
if (read_track)
|
|
del_timer( &readtrack_timer );
|
|
#endif
|
|
|
|
|
|
/* Correct the track if stretch != 0 */
|
|
if (unit[SelectedDrive].disktype->stretch) {
|
|
track = FDC1772_READ(FDC1772REG_TRACK);
|
|
FDC1772_WRITE(FDC1772REG_TRACK, track <<
|
|
unit[SelectedDrive].disktype->stretch);
|
|
}
|
|
if (ReqCmd == WRITE && (status & FDC1772STAT_WPROT)) {
|
|
printk("fd%d: is write protected\n", SelectedDrive);
|
|
goto err_end;
|
|
}
|
|
if ((status & FDC1772STAT_RECNF)
|
|
#ifdef TRACKBUFFER
|
|
/* RECNF is no error after a multiple read when the FDC
|
|
* searched for a non-existant sector!
|
|
*/
|
|
&& !(read_track &&
|
|
FDC1772_READ(FDC1772REG_SECTOR) > unit[SelectedDrive].disktype->spt)
|
|
#endif
|
|
) {
|
|
if (Probing) {
|
|
if (unit[SelectedDrive].disktype > disk_type) {
|
|
/* try another disk type */
|
|
unit[SelectedDrive].disktype--;
|
|
set_capacity(disks[SelectedDrive],
|
|
unit[SelectedDrive].disktype->blocks);
|
|
} else
|
|
Probing = 0;
|
|
} else {
|
|
/* record not found, but not probing. Maybe stretch wrong ? Restart probing */
|
|
if (unit[SelectedDrive].autoprobe) {
|
|
unit[SelectedDrive].disktype = disk_type + NUM_DISK_TYPES - 1;
|
|
set_capacity(disks[SelectedDrive],
|
|
unit[SelectedDrive].disktype->blocks);
|
|
Probing = 1;
|
|
}
|
|
}
|
|
if (Probing) {
|
|
setup_req_params(SelectedDrive);
|
|
#ifdef TRACKBUFFER
|
|
BufferDrive = -1;
|
|
#endif
|
|
do_fd_action(SelectedDrive);
|
|
return;
|
|
}
|
|
printk("fd%d: sector %d not found (side %d, track %d)\n",
|
|
SelectedDrive, FDC1772_READ(FDC1772REG_SECTOR), ReqSide, ReqTrack);
|
|
goto err_end;
|
|
}
|
|
if (status & FDC1772STAT_CRC) {
|
|
printk("fd%d: CRC error (side %d, track %d, sector %d)\n",
|
|
SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR));
|
|
goto err_end;
|
|
}
|
|
if (status & FDC1772STAT_LOST) {
|
|
printk("fd%d: lost data (side %d, track %d, sector %d)\n",
|
|
SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR));
|
|
goto err_end;
|
|
}
|
|
Probing = 0;
|
|
|
|
if (ReqCmd == READ) {
|
|
#ifdef TRACKBUFFER
|
|
if (!read_track) {
|
|
/*cache_clear (PhysDMABuffer, 512);*/
|
|
copy_buffer (DMABuffer, ReqData);
|
|
} else {
|
|
/*cache_clear (PhysTrackBuffer, FD1772_MAX_SECTORS * 512);*/
|
|
BufferDrive = SelectedDrive;
|
|
BufferSide = ReqSide;
|
|
BufferTrack = ReqTrack;
|
|
copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
|
|
}
|
|
#else
|
|
/*cache_clear( PhysDMABuffer, 512 ); */
|
|
copy_buffer(DMABuffer, ReqData);
|
|
#endif
|
|
}
|
|
if (++ReqCnt < CURRENT->current_nr_sectors) {
|
|
/* read next sector */
|
|
setup_req_params(SelectedDrive);
|
|
do_fd_action(SelectedDrive);
|
|
} else {
|
|
/* all sectors finished */
|
|
CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
|
|
CURRENT->sector += CURRENT->current_nr_sectors;
|
|
end_request(CURRENT, 1);
|
|
redo_fd_request();
|
|
}
|
|
return;
|
|
|
|
err_end:
|
|
#ifdef TRACKBUFFER
|
|
BufferDrive = -1;
|
|
#endif
|
|
|
|
fd_error();
|
|
}
|
|
|
|
|
|
static void fd_times_out(unsigned long dummy)
|
|
{
|
|
SET_IRQ_HANDLER(NULL);
|
|
/* If the timeout occurred while the readtrack_check timer was
|
|
* active, we need to cancel it, else bad things will happen */
|
|
del_timer( &readtrack_timer );
|
|
FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI);
|
|
udelay(25);
|
|
|
|
printk("floppy timeout\n");
|
|
STOP_TIMEOUT(); /* hmm - should we do this ? */
|
|
fd_error();
|
|
}
|
|
|
|
|
|
/* The (noop) seek operation here is needed to make the WP bit in the
|
|
* FDC1772 status register accessible for check_change. If the last disk
|
|
* operation would have been a RDSEC, this bit would always read as 0
|
|
* no matter what :-( To save time, the seek goes to the track we're
|
|
* already on.
|
|
*/
|
|
|
|
static void finish_fdc(void)
|
|
{
|
|
/* DAG - just try without this dummy seek! */
|
|
finish_fdc_done(0);
|
|
return;
|
|
|
|
if (!NeedSeek) {
|
|
finish_fdc_done(0);
|
|
} else {
|
|
DPRINT(("finish_fdc: dummy seek started\n"));
|
|
FDC1772_WRITE(FDC1772REG_DATA, unit[SelectedDrive].track);
|
|
SET_IRQ_HANDLER(finish_fdc_done);
|
|
FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK);
|
|
MotorOn = 1;
|
|
START_TIMEOUT();
|
|
/* we must wait for the IRQ here, because the ST-DMA is
|
|
* released immediately afterwards and the interrupt may be
|
|
* delivered to the wrong driver.
|
|
*/
|
|
}
|
|
}
|
|
|
|
|
|
static void finish_fdc_done(int dummy)
|
|
{
|
|
unsigned long flags;
|
|
|
|
DPRINT(("finish_fdc_done entered\n"));
|
|
STOP_TIMEOUT();
|
|
NeedSeek = 0;
|
|
|
|
if (timer_pending(&fd_timer) &&
|
|
time_after(jiffies + 5, fd_timer.expires))
|
|
/* If the check for a disk change is done too early after this
|
|
* last seek command, the WP bit still reads wrong :-((
|
|
*/
|
|
mod_timer(&fd_timer, jiffies + 5);
|
|
else {
|
|
/* START_CHECK_CHANGE_TIMER( CHECK_CHANGE_DELAY ); */
|
|
};
|
|
del_timer(&motor_off_timer);
|
|
START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY);
|
|
|
|
save_flags(flags);
|
|
cli();
|
|
/* stdma_release(); - not sure if I should do something DAG */
|
|
fdc_busy = 0;
|
|
wake_up(&fdc_wait);
|
|
restore_flags(flags);
|
|
|
|
DPRINT(("finish_fdc() finished\n"));
|
|
}
|
|
|
|
|
|
/* Prevent "aliased" accesses. */
|
|
static int fd_ref[4];
|
|
static int fd_device[4];
|
|
|
|
/* dummy for blk.h */
|
|
static void floppy_off(unsigned int nr)
|
|
{
|
|
}
|
|
|
|
|
|
/* On the old arcs write protect depends on the particular model
|
|
of machine. On the A310, R140, and A440 there is a disc changed
|
|
detect, however on the A4x0/1 range there is not. There
|
|
is nothing to tell you which machine your on.
|
|
At the moment I'm just marking changed always. I've
|
|
left the Atari's 'change on write protect change' code in this
|
|
part (but nothing sets it).
|
|
RiscOS apparently checks the disc serial number etc. to detect changes
|
|
- but if it sees a disc change line go high (?) it flips to using
|
|
it. Well maybe I'll add that in the future (!?)
|
|
*/
|
|
static int check_floppy_change(struct gendisk *disk)
|
|
{
|
|
struct archy_floppy_struct *p = disk->private_data;
|
|
unsigned int drive = p - unit;
|
|
|
|
if (test_bit(drive, &fake_change)) {
|
|
/* simulated change (e.g. after formatting) */
|
|
return 1;
|
|
}
|
|
if (test_bit(drive, &changed_floppies)) {
|
|
/* surely changed (the WP signal changed at least once) */
|
|
return 1;
|
|
}
|
|
if (p->wpstat) {
|
|
/* WP is on -> could be changed: to be sure, buffers should be
|
|
* invalidated...
|
|
*/
|
|
return 1;
|
|
}
|
|
return 1; /* DAG - was 0 */
|
|
}
|
|
|
|
static int floppy_revalidate(struct gendisk *disk)
|
|
{
|
|
struct archy_floppy_struct *p = disk->private_data;
|
|
unsigned int drive = p - unit;
|
|
|
|
if (test_bit(drive, &changed_floppies) || test_bit(drive, &fake_change)
|
|
|| unit[drive].disktype == 0) {
|
|
#ifdef TRACKBUFFER
|
|
BufferDrive = -1;
|
|
#endif
|
|
clear_bit(drive, &fake_change);
|
|
clear_bit(drive, &changed_floppies);
|
|
p->disktype = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* This sets up the global variables describing the current request. */
|
|
|
|
static void setup_req_params(int drive)
|
|
{
|
|
int block = ReqBlock + ReqCnt;
|
|
|
|
ReqTrack = block / unit[drive].disktype->spt;
|
|
ReqSector = block - ReqTrack * unit[drive].disktype->spt + 1;
|
|
ReqSide = ReqTrack & 1;
|
|
ReqTrack >>= 1;
|
|
ReqData = ReqBuffer + 512 * ReqCnt;
|
|
|
|
#ifdef TRACKBUFFER
|
|
read_track = (ReqCmd == READ && CURRENT->errors == 0);
|
|
#endif
|
|
|
|
DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n", ReqSide,
|
|
ReqTrack, ReqSector, (unsigned long) ReqData));
|
|
}
|
|
|
|
|
|
static void redo_fd_request(void)
|
|
{
|
|
int drive, type;
|
|
struct archy_floppy_struct *floppy;
|
|
|
|
DPRINT(("redo_fd_request: CURRENT=%p dev=%s CURRENT->sector=%ld\n",
|
|
CURRENT, CURRENT ? CURRENT->rq_disk->disk_name : "",
|
|
CURRENT ? CURRENT->sector : 0));
|
|
|
|
repeat:
|
|
|
|
if (!CURRENT)
|
|
goto the_end;
|
|
|
|
floppy = CURRENT->rq_disk->private_data;
|
|
drive = floppy - unit;
|
|
type = fd_device[drive];
|
|
|
|
if (!floppy->connected) {
|
|
/* drive not connected */
|
|
printk("Unknown Device: fd%d\n", drive);
|
|
end_request(CURRENT, 0);
|
|
goto repeat;
|
|
}
|
|
if (type == 0) {
|
|
if (!floppy->disktype) {
|
|
Probing = 1;
|
|
floppy->disktype = disk_type + NUM_DISK_TYPES - 1;
|
|
set_capacity(disks[drive], floppy->disktype->blocks);
|
|
floppy->autoprobe = 1;
|
|
}
|
|
} else {
|
|
/* user supplied disk type */
|
|
--type;
|
|
if (type >= NUM_DISK_TYPES) {
|
|
printk("fd%d: invalid disk format", drive);
|
|
end_request(CURRENT, 0);
|
|
goto repeat;
|
|
}
|
|
floppy->disktype = &disk_type[type];
|
|
set_capacity(disks[drive], floppy->disktype->blocks);
|
|
floppy->autoprobe = 0;
|
|
}
|
|
|
|
if (CURRENT->sector + 1 > floppy->disktype->blocks) {
|
|
end_request(CURRENT, 0);
|
|
goto repeat;
|
|
}
|
|
/* stop deselect timer */
|
|
del_timer(&motor_off_timer);
|
|
|
|
ReqCnt = 0;
|
|
ReqCmd = CURRENT->cmd;
|
|
ReqBlock = CURRENT->sector;
|
|
ReqBuffer = CURRENT->buffer;
|
|
setup_req_params(drive);
|
|
do_fd_action(drive);
|
|
|
|
return;
|
|
|
|
the_end:
|
|
finish_fdc();
|
|
}
|
|
|
|
static void fd1772_checkint(void)
|
|
{
|
|
extern int fdc1772_bytestogo;
|
|
|
|
/*printk("fd1772_checkint %d\n",fdc1772_fdc_int_done);*/
|
|
if (fdc1772_fdc_int_done)
|
|
floppy_irqconsequencehandler();
|
|
if ((MultReadInProgress) && (fdc1772_bytestogo==0)) fd_readtrack_check(0);
|
|
if (fdc_busy) {
|
|
schedule_work(&fd1772_tq);
|
|
}
|
|
}
|
|
|
|
static void do_fd_request(request_queue_t* q)
|
|
{
|
|
unsigned long flags;
|
|
|
|
DPRINT(("do_fd_request for pid %d\n", current->pid));
|
|
if (fdc_busy) return;
|
|
save_flags(flags);
|
|
cli();
|
|
wait_event(fdc_wait, !fdc_busy);
|
|
fdc_busy = 1;
|
|
ENABLE_IRQ();
|
|
restore_flags(flags);
|
|
|
|
fdc1772_fdc_int_done = 0;
|
|
|
|
redo_fd_request();
|
|
|
|
schedule_work(&fd1772_tq);
|
|
}
|
|
|
|
|
|
static int invalidate_drive(struct block_device *bdev)
|
|
{
|
|
struct archy_floppy_struct *p = bdev->bd_disk->private_data;
|
|
/* invalidate the buffer track to force a reread */
|
|
#ifdef TRACKBUFFER
|
|
BufferDrive = -1;
|
|
#endif
|
|
|
|
set_bit(p - unit, &fake_change);
|
|
return 0;
|
|
}
|
|
|
|
static int fd_ioctl(struct inode *inode, struct file *filp,
|
|
unsigned int cmd, unsigned long param)
|
|
{
|
|
struct block_device *bdev = inode->i_bdev;
|
|
|
|
switch (cmd) {
|
|
case FDFMTEND:
|
|
case FDFLUSH:
|
|
invalidate_drive(bdev);
|
|
check_disk_change(bdev);
|
|
case FDFMTBEG:
|
|
return 0;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
|
|
/* Initialize the 'unit' variable for drive 'drive' */
|
|
|
|
static void fd_probe(int drive)
|
|
{
|
|
unit[drive].connected = 0;
|
|
unit[drive].disktype = NULL;
|
|
|
|
if (!fd_test_drive_present(drive))
|
|
return;
|
|
|
|
unit[drive].connected = 1;
|
|
unit[drive].track = -1; /* If we put the auto detect back in this can go to 0 */
|
|
unit[drive].steprate = FDC1772STEP_6;
|
|
MotorOn = 1; /* from probe restore operation! */
|
|
}
|
|
|
|
|
|
/* This function tests the physical presence of a floppy drive (not
|
|
* whether a disk is inserted). This is done by issuing a restore
|
|
* command, waiting max. 2 seconds (that should be enough to move the
|
|
* head across the whole disk) and looking at the state of the "TR00"
|
|
* signal. This should now be raised if there is a drive connected
|
|
* (and there is no hardware failure :-) Otherwise, the drive is
|
|
* declared absent.
|
|
*/
|
|
|
|
static int fd_test_drive_present(int drive)
|
|
{
|
|
unsigned long timeout;
|
|
unsigned char status;
|
|
int ok;
|
|
|
|
printk("fd_test_drive_present %d\n", drive);
|
|
if (drive > 1)
|
|
return (0);
|
|
return (1); /* Simple hack for the moment - the autodetect doesn't seem to work on arc */
|
|
fd_select_drive(drive);
|
|
|
|
/* disable interrupt temporarily */
|
|
DISABLE_IRQ();
|
|
FDC1772_WRITE(FDC1772REG_TRACK, 0x00); /* was ff00 why? */
|
|
FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | FDC1772CMDADD_H | FDC1772STEP_6);
|
|
|
|
/*printk("fd_test_drive_present: Going into timeout loop\n"); */
|
|
for (ok = 0, timeout = jiffies + 2 * HZ + HZ / 2; time_before(jiffies, timeout);) {
|
|
/* What does this piece of atariism do? - query for an interrupt? */
|
|
/* if (!(mfp.par_dt_reg & 0x20))
|
|
break; */
|
|
/* Well this is my nearest guess - quit when we get an FDC interrupt */
|
|
if (ioc_readb(IOC_FIQSTAT) & 2)
|
|
break;
|
|
}
|
|
|
|
/*printk("fd_test_drive_present: Coming out of timeout loop\n"); */
|
|
status = FDC1772_READ(FDC1772REG_STATUS);
|
|
ok = (status & FDC1772STAT_TR00) != 0;
|
|
|
|
/*printk("fd_test_drive_present: ok=%d\n",ok); */
|
|
/* force interrupt to abort restore operation (FDC1772 would try
|
|
* about 50 seconds!) */
|
|
FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI);
|
|
udelay(500);
|
|
status = FDC1772_READ(FDC1772REG_STATUS);
|
|
udelay(20);
|
|
/*printk("fd_test_drive_present: just before OK code %d\n",ok); */
|
|
|
|
if (ok) {
|
|
/* dummy seek command to make WP bit accessible */
|
|
FDC1772_WRITE(FDC1772REG_DATA, 0);
|
|
FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK);
|
|
printk("fd_test_drive_present: just before wait for int\n");
|
|
/* DAG: Guess means wait for interrupt */
|
|
while (!(ioc_readb(IOC_FIQSTAT) & 2));
|
|
printk("fd_test_drive_present: just after wait for int\n");
|
|
status = FDC1772_READ(FDC1772REG_STATUS);
|
|
}
|
|
printk("fd_test_drive_present: just before ENABLE_IRQ\n");
|
|
ENABLE_IRQ();
|
|
printk("fd_test_drive_present: about to return\n");
|
|
return (ok);
|
|
}
|
|
|
|
|
|
/* Look how many and which kind of drives are connected. If there are
|
|
* floppies, additionally start the disk-change and motor-off timers.
|
|
*/
|
|
|
|
static void config_types(void)
|
|
{
|
|
int drive, cnt = 0;
|
|
|
|
printk("Probing floppy drive(s):\n");
|
|
for (drive = 0; drive < FD_MAX_UNITS; drive++) {
|
|
fd_probe(drive);
|
|
if (unit[drive].connected) {
|
|
printk("fd%d\n", drive);
|
|
++cnt;
|
|
}
|
|
}
|
|
|
|
if (FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_BUSY) {
|
|
/* If FDC1772 is still busy from probing, give it another FORCI
|
|
* command to abort the operation. If this isn't done, the FDC1772
|
|
* will interrupt later and its IRQ line stays low, because
|
|
* the status register isn't read. And this will block any
|
|
* interrupts on this IRQ line :-(
|
|
*/
|
|
FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI);
|
|
udelay(500);
|
|
FDC1772_READ(FDC1772REG_STATUS);
|
|
udelay(20);
|
|
}
|
|
if (cnt > 0) {
|
|
START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY);
|
|
if (cnt == 1)
|
|
fd_select_drive(0);
|
|
/*START_CHECK_CHANGE_TIMER( CHECK_CHANGE_DELAY ); */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* floppy_open check for aliasing (/dev/fd0 can be the same as
|
|
* /dev/PS0 etc), and disallows simultaneous access to the same
|
|
* drive with different device numbers.
|
|
*/
|
|
|
|
static int floppy_open(struct inode *inode, struct file *filp)
|
|
{
|
|
int drive = iminor(inode) & 3;
|
|
int type = iminor(inode) >> 2;
|
|
int old_dev = fd_device[drive];
|
|
|
|
if (fd_ref[drive] && old_dev != type)
|
|
return -EBUSY;
|
|
|
|
if (fd_ref[drive] == -1 || (fd_ref[drive] && filp->f_flags & O_EXCL))
|
|
return -EBUSY;
|
|
|
|
if (filp->f_flags & O_EXCL)
|
|
fd_ref[drive] = -1;
|
|
else
|
|
fd_ref[drive]++;
|
|
|
|
fd_device[drive] = type;
|
|
|
|
if (filp->f_flags & O_NDELAY)
|
|
return 0;
|
|
|
|
if (filp->f_mode & 3) {
|
|
check_disk_change(inode->i_bdev);
|
|
if (filp->f_mode & 2) {
|
|
if (unit[drive].wpstat) {
|
|
floppy_release(inode, filp);
|
|
return -EROFS;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int floppy_release(struct inode *inode, struct file *filp)
|
|
{
|
|
int drive = iminor(inode) & 3;
|
|
|
|
if (fd_ref[drive] < 0)
|
|
fd_ref[drive] = 0;
|
|
else if (!fd_ref[drive]--) {
|
|
printk("floppy_release with fd_ref == 0");
|
|
fd_ref[drive] = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct block_device_operations floppy_fops =
|
|
{
|
|
.open = floppy_open,
|
|
.release = floppy_release,
|
|
.ioctl = fd_ioctl,
|
|
.media_changed = check_floppy_change,
|
|
.revalidate_disk= floppy_revalidate,
|
|
};
|
|
|
|
static struct kobject *floppy_find(dev_t dev, int *part, void *data)
|
|
{
|
|
int drive = *part & 3;
|
|
if ((*part >> 2) > NUM_DISK_TYPES || drive >= FD_MAX_UNITS)
|
|
return NULL;
|
|
*part = 0;
|
|
return get_disk(disks[drive]);
|
|
}
|
|
|
|
int fd1772_init(void)
|
|
{
|
|
static DEFINE_SPINLOCK(lock);
|
|
int i, err = -ENOMEM;
|
|
|
|
if (!machine_is_archimedes())
|
|
return 0;
|
|
|
|
for (i = 0; i < FD_MAX_UNITS; i++) {
|
|
disks[i] = alloc_disk(1);
|
|
if (!disks[i])
|
|
goto err_disk;
|
|
}
|
|
|
|
err = register_blkdev(MAJOR_NR, "fd");
|
|
if (err)
|
|
goto err_disk;
|
|
|
|
err = -EBUSY;
|
|
if (request_dma(FLOPPY_DMA, "fd1772")) {
|
|
printk("Unable to grab DMA%d for the floppy (1772) driver\n", FLOPPY_DMA);
|
|
goto err_blkdev;
|
|
};
|
|
|
|
if (request_dma(FIQ_FD1772, "fd1772 end")) {
|
|
printk("Unable to grab DMA%d for the floppy (1772) driver\n", FIQ_FD1772);
|
|
goto err_dma1;
|
|
};
|
|
|
|
/* initialize variables */
|
|
SelectedDrive = -1;
|
|
#ifdef TRACKBUFFER
|
|
BufferDrive = BufferSide = BufferTrack = -1;
|
|
/* Atari uses 512 - I want to eventually cope with 1K sectors */
|
|
DMABuffer = (char *)kmalloc((FD1772_MAX_SECTORS+1)*512,GFP_KERNEL);
|
|
TrackBuffer = DMABuffer + 512;
|
|
#else
|
|
/* Allocate memory for the DMAbuffer - on the Atari this takes it
|
|
out of some special memory... */
|
|
DMABuffer = (char *) kmalloc(2048); /* Copes with pretty large sectors */
|
|
#endif
|
|
err = -ENOMEM;
|
|
if (!DMAbuffer)
|
|
goto err_dma2;
|
|
|
|
enable_dma(FIQ_FD1772); /* This inserts a call to our command end routine */
|
|
|
|
floppy_queue = blk_init_queue(do_fd_request, &lock);
|
|
if (!floppy_queue)
|
|
goto err_queue;
|
|
|
|
for (i = 0; i < FD_MAX_UNITS; i++) {
|
|
unit[i].track = -1;
|
|
disks[i]->major = MAJOR_NR;
|
|
disks[i]->first_minor = 0;
|
|
disks[i]->fops = &floppy_fops;
|
|
sprintf(disks[i]->disk_name, "fd%d", i);
|
|
disks[i]->private_data = &unit[i];
|
|
disks[i]->queue = floppy_queue;
|
|
set_capacity(disks[i], MAX_DISK_SIZE * 2);
|
|
}
|
|
blk_register_region(MKDEV(MAJOR_NR, 0), 256, THIS_MODULE,
|
|
floppy_find, NULL, NULL);
|
|
|
|
for (i = 0; i < FD_MAX_UNITS; i++)
|
|
add_disk(disks[i]);
|
|
|
|
config_types();
|
|
|
|
return 0;
|
|
|
|
err_queue:
|
|
kfree(DMAbuffer);
|
|
err_dma2:
|
|
free_dma(FIQ_FD1772);
|
|
|
|
err_dma1:
|
|
free_dma(FLOPPY_DMA);
|
|
|
|
err_blkdev:
|
|
unregister_blkdev(MAJOR_NR, "fd");
|
|
|
|
err_disk:
|
|
while (i--)
|
|
put_disk(disks[i]);
|
|
return err;
|
|
}
|