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floppy.c
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floppy.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/drivers/block/floppy.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 1993, 1994 Alain Knaff
* Copyright (C) 1998 Alan Cox
*/
/*
* 02.12.91 - Changed to static variables to indicate need for reset
* and recalibrate. This makes some things easier (output_byte reset
* checking etc), and means less interrupt jumping in case of errors,
* so the code is hopefully easier to understand.
*/
/*
* This file is certainly a mess. I've tried my best to get it working,
* but I don't like programming floppies, and I have only one anyway.
* Urgel. I should check for more errors, and do more graceful error
* recovery. Seems there are problems with several drives. I've tried to
* correct them. No promises.
*/
/*
* As with hd.c, all routines within this file can (and will) be called
* by interrupts, so extreme caution is needed. A hardware interrupt
* handler may not sleep, or a kernel panic will happen. Thus I cannot
* call "floppy-on" directly, but have to set a special timer interrupt
* etc.
*/
/*
* 28.02.92 - made track-buffering routines, based on the routines written
* by [email protected] (Lawrence Foard). Linus.
*/
/*
* Automatic floppy-detection and formatting written by Werner Almesberger
* ([email protected]), who also corrected some problems with
* the floppy-change signal detection.
*/
/*
* 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
* FDC data overrun bug, added some preliminary stuff for vertical
* recording support.
*
* 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
*
* TODO: Errors are still not counted properly.
*/
/* 1992/9/20
* Modifications for ``Sector Shifting'' by Rob Hooft ([email protected])
* modeled after the freeware MS-DOS program fdformat/88 V1.8 by
* Christoph H. Hochst\"atter.
* I have fixed the shift values to the ones I always use. Maybe a new
* ioctl() should be created to be able to modify them.
* There is a bug in the driver that makes it impossible to format a
* floppy as the first thing after bootup.
*/
/*
* 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
* this helped the floppy driver as well. Much cleaner, and still seems to
* work.
*/
/* 1994/6/24 --bbroad-- added the floppy table entries and made
* minor modifications to allow 2.88 floppies to be run.
*/
/* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
* disk types.
*/
/*
* 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
* format bug fixes, but unfortunately some new bugs too...
*/
/* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
* errors to allow safe writing by specialized programs.
*/
/* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
* by defining bit 1 of the "stretch" parameter to mean put sectors on the
* opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
* drives are "upside-down").
*/
/*
* 1995/8/26 -- Andreas Busse -- added Mips support.
*/
/*
* 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
* features to asm/floppy.h.
*/
/*
* 1998/1/21 -- Richard Gooch <[email protected]> -- devfs support
*/
/*
* 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
* interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
* use of '0' for NULL.
*/
/*
* 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
* failures.
*/
/*
* 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
*/
/*
* 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
* days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
* being used to store jiffies, which are unsigned longs).
*/
/*
* 2000/08/28 -- Arnaldo Carvalho de Melo <[email protected]>
* - get rid of check_region
* - s/suser/capable/
*/
/*
* 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
* floppy controller (lingering task on list after module is gone... boom.)
*/
/*
* 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
* (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
* requires many non-obvious changes in arch dependent code.
*/
/* 2003/07/28 -- Daniele Bellucci <[email protected]>.
* Better audit of register_blkdev.
*/
#define REALLY_SLOW_IO
#define DEBUGT 2
#define DPRINT(format, args...) \
pr_info("floppy%d: " format, current_drive, ##args)
#define DCL_DEBUG /* debug disk change line */
#ifdef DCL_DEBUG
#define debug_dcl(test, fmt, args...) \
do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
#else
#define debug_dcl(test, fmt, args...) \
do { if (0) DPRINT(fmt, ##args); } while (0)
#endif
/* do print messages for unexpected interrupts */
static int print_unex = 1;
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/fdreg.h>
#include <linux/fd.h>
#include <linux/hdreg.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/bio.h>
#include <linux/string.h>
#include <linux/jiffies.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/mc146818rtc.h> /* CMOS defines */
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/major.h>
#include <linux/platform_device.h>
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/async.h>
#include <linux/compat.h>
/*
* PS/2 floppies have much slower step rates than regular floppies.
* It's been recommended that take about 1/4 of the default speed
* in some more extreme cases.
*/
static DEFINE_MUTEX(floppy_mutex);
static int slow_floppy;
#include <asm/dma.h>
#include <asm/irq.h>
static int FLOPPY_IRQ = 6;
static int FLOPPY_DMA = 2;
static int can_use_virtual_dma = 2;
/* =======
* can use virtual DMA:
* 0 = use of virtual DMA disallowed by config
* 1 = use of virtual DMA prescribed by config
* 2 = no virtual DMA preference configured. By default try hard DMA,
* but fall back on virtual DMA when not enough memory available
*/
static int use_virtual_dma;
/* =======
* use virtual DMA
* 0 using hard DMA
* 1 using virtual DMA
* This variable is set to virtual when a DMA mem problem arises, and
* reset back in floppy_grab_irq_and_dma.
* It is not safe to reset it in other circumstances, because the floppy
* driver may have several buffers in use at once, and we do currently not
* record each buffers capabilities
*/
static DEFINE_SPINLOCK(floppy_lock);
static unsigned short virtual_dma_port = 0x3f0;
irqreturn_t floppy_interrupt(int irq, void *dev_id);
static int set_dor(int fdc, char mask, char data);
#define K_64 0x10000 /* 64KB */
/* the following is the mask of allowed drives. By default units 2 and
* 3 of both floppy controllers are disabled, because switching on the
* motor of these drives causes system hangs on some PCI computers. drive
* 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
* a drive is allowed.
*
* NOTE: This must come before we include the arch floppy header because
* some ports reference this variable from there. -DaveM
*/
static int allowed_drive_mask = 0x33;
#include <asm/floppy.h>
static int irqdma_allocated;
#include <linux/blk-mq.h>
#include <linux/blkpg.h>
#include <linux/cdrom.h> /* for the compatibility eject ioctl */
#include <linux/completion.h>
static LIST_HEAD(floppy_reqs);
static struct request *current_req;
static int set_next_request(void);
#ifndef fd_get_dma_residue
#define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
#endif
/* Dma Memory related stuff */
#ifndef fd_dma_mem_free
#define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
#endif
#ifndef fd_dma_mem_alloc
#define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
#endif
#ifndef fd_cacheflush
#define fd_cacheflush(addr, size) /* nothing... */
#endif
static inline void fallback_on_nodma_alloc(char **addr, size_t l)
{
#ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
if (*addr)
return; /* we have the memory */
if (can_use_virtual_dma != 2)
return; /* no fallback allowed */
pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
*addr = (char *)nodma_mem_alloc(l);
#else
return;
#endif
}
/* End dma memory related stuff */
static unsigned long fake_change;
static bool initialized;
#define ITYPE(x) (((x) >> 2) & 0x1f)
#define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
#define UNIT(x) ((x) & 0x03) /* drive on fdc */
#define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
/* reverse mapping from unit and fdc to drive */
#define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
#define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
#define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
/* read/write commands */
#define COMMAND 0
#define DR_SELECT 1
#define TRACK 2
#define HEAD 3
#define SECTOR 4
#define SIZECODE 5
#define SECT_PER_TRACK 6
#define GAP 7
#define SIZECODE2 8
#define NR_RW 9
/* format commands */
#define F_SIZECODE 2
#define F_SECT_PER_TRACK 3
#define F_GAP 4
#define F_FILL 5
#define NR_F 6
/*
* Maximum disk size (in kilobytes).
* This default is used whenever the current disk size is unknown.
* [Now it is rather a minimum]
*/
#define MAX_DISK_SIZE 4 /* 3984 */
/*
* globals used by 'result()'
*/
static unsigned char reply_buffer[FD_RAW_REPLY_SIZE];
static int inr; /* size of reply buffer, when called from interrupt */
#define ST0 0
#define ST1 1
#define ST2 2
#define ST3 0 /* result of GETSTATUS */
#define R_TRACK 3
#define R_HEAD 4
#define R_SECTOR 5
#define R_SIZECODE 6
#define SEL_DLY (2 * HZ / 100)
/*
* this struct defines the different floppy drive types.
*/
static struct {
struct floppy_drive_params params;
const char *name; /* name printed while booting */
} default_drive_params[] = {
/* NOTE: the time values in jiffies should be in msec!
CMOS drive type
| Maximum data rate supported by drive type
| | Head load time, msec
| | | Head unload time, msec (not used)
| | | | Step rate interval, usec
| | | | | Time needed for spinup time (jiffies)
| | | | | | Timeout for spinning down (jiffies)
| | | | | | | Spindown offset (where disk stops)
| | | | | | | | Select delay
| | | | | | | | | RPS
| | | | | | | | | | Max number of tracks
| | | | | | | | | | | Interrupt timeout
| | | | | | | | | | | | Max nonintlv. sectors
| | | | | | | | | | | | | -Max Errors- flags */
{{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
{{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
{{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
{{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
{{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
{{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
{{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
/* | --autodetected formats--- | | |
* read_track | | Name printed when booting
* | Native format
* Frequency of disk change checks */
};
static struct floppy_drive_params drive_params[N_DRIVE];
static struct floppy_drive_struct drive_state[N_DRIVE];
static struct floppy_write_errors write_errors[N_DRIVE];
static struct timer_list motor_off_timer[N_DRIVE];
static struct blk_mq_tag_set tag_sets[N_DRIVE];
static struct block_device *opened_bdev[N_DRIVE];
static DEFINE_MUTEX(open_lock);
static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
/*
* This struct defines the different floppy types.
*
* Bit 0 of 'stretch' tells if the tracks need to be doubled for some
* types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
* tells if the disk is in Commodore 1581 format, which means side 0 sectors
* are located on side 1 of the disk but with a side 0 ID, and vice-versa.
* This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
* 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
* side 0 is on physical side 0 (but with the misnamed sector IDs).
* 'stretch' should probably be renamed to something more general, like
* 'options'.
*
* Bits 2 through 9 of 'stretch' tell the number of the first sector.
* The LSB (bit 2) is flipped. For most disks, the first sector
* is 1 (represented by 0x00<<2). For some CP/M and music sampler
* disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
* For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
*
* Other parameters should be self-explanatory (see also setfdprm(8)).
*/
/*
Size
| Sectors per track
| | Head
| | | Tracks
| | | | Stretch
| | | | | Gap 1 size
| | | | | | Data rate, | 0x40 for perp
| | | | | | | Spec1 (stepping rate, head unload
| | | | | | | | /fmt gap (gap2) */
static struct floppy_struct floppy_type[32] = {
{ 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
{ 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
{ 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
{ 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
{ 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
{ 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
{ 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
{ 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
{ 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
{ 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
{ 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
{ 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
{ 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
{ 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
{ 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
{ 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
{ 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
{ 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
{ 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
{ 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
{ 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
{ 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
{ 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
{ 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
{ 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
{ 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
{ 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
{ 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
{ 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
{ 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
{ 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
};
static struct gendisk *disks[N_DRIVE][ARRAY_SIZE(floppy_type)];
#define SECTSIZE (_FD_SECTSIZE(*floppy))
/* Auto-detection: Disk type used until the next media change occurs. */
static struct floppy_struct *current_type[N_DRIVE];
/*
* User-provided type information. current_type points to
* the respective entry of this array.
*/
static struct floppy_struct user_params[N_DRIVE];
static sector_t floppy_sizes[256];
static char floppy_device_name[] = "floppy";
/*
* The driver is trying to determine the correct media format
* while probing is set. rw_interrupt() clears it after a
* successful access.
*/
static int probing;
/* Synchronization of FDC access. */
#define FD_COMMAND_NONE -1
#define FD_COMMAND_ERROR 2
#define FD_COMMAND_OKAY 3
static volatile int command_status = FD_COMMAND_NONE;
static unsigned long fdc_busy;
static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
static DECLARE_WAIT_QUEUE_HEAD(command_done);
/* errors encountered on the current (or last) request */
static int floppy_errors;
/* Format request descriptor. */
static struct format_descr format_req;
/*
* Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
* Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
* H is head unload time (1=16ms, 2=32ms, etc)
*/
/*
* Track buffer
* Because these are written to by the DMA controller, they must
* not contain a 64k byte boundary crossing, or data will be
* corrupted/lost.
*/
static char *floppy_track_buffer;
static int max_buffer_sectors;
typedef void (*done_f)(int);
static const struct cont_t {
void (*interrupt)(void);
/* this is called after the interrupt of the
* main command */
void (*redo)(void); /* this is called to retry the operation */
void (*error)(void); /* this is called to tally an error */
done_f done; /* this is called to say if the operation has
* succeeded/failed */
} *cont;
static void floppy_ready(void);
static void floppy_start(void);
static void process_fd_request(void);
static void recalibrate_floppy(void);
static void floppy_shutdown(struct work_struct *);
static int floppy_request_regions(int);
static void floppy_release_regions(int);
static int floppy_grab_irq_and_dma(void);
static void floppy_release_irq_and_dma(void);
/*
* The "reset" variable should be tested whenever an interrupt is scheduled,
* after the commands have been sent. This is to ensure that the driver doesn't
* get wedged when the interrupt doesn't come because of a failed command.
* reset doesn't need to be tested before sending commands, because
* output_byte is automatically disabled when reset is set.
*/
static void reset_fdc(void);
static int floppy_revalidate(struct gendisk *disk);
/*
* These are global variables, as that's the easiest way to give
* information to interrupts. They are the data used for the current
* request.
*/
#define NO_TRACK -1
#define NEED_1_RECAL -2
#define NEED_2_RECAL -3
static atomic_t usage_count = ATOMIC_INIT(0);
/* buffer related variables */
static int buffer_track = -1;
static int buffer_drive = -1;
static int buffer_min = -1;
static int buffer_max = -1;
/* fdc related variables, should end up in a struct */
static struct floppy_fdc_state fdc_state[N_FDC];
static int current_fdc; /* current fdc */
static struct workqueue_struct *floppy_wq;
static struct floppy_struct *_floppy = floppy_type;
static unsigned char current_drive;
static long current_count_sectors;
static unsigned char fsector_t; /* sector in track */
static unsigned char in_sector_offset; /* offset within physical sector,
* expressed in units of 512 bytes */
static inline unsigned char fdc_inb(int fdc, int reg)
{
return fd_inb(fdc_state[fdc].address, reg);
}
static inline void fdc_outb(unsigned char value, int fdc, int reg)
{
fd_outb(value, fdc_state[fdc].address, reg);
}
static inline bool drive_no_geom(int drive)
{
return !current_type[drive] && !ITYPE(drive_state[drive].fd_device);
}
#ifndef fd_eject
static inline int fd_eject(int drive)
{
return -EINVAL;
}
#endif
/*
* Debugging
* =========
*/
#ifdef DEBUGT
static long unsigned debugtimer;
static inline void set_debugt(void)
{
debugtimer = jiffies;
}
static inline void debugt(const char *func, const char *msg)
{
if (drive_params[current_drive].flags & DEBUGT)
pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
}
#else
static inline void set_debugt(void) { }
static inline void debugt(const char *func, const char *msg) { }
#endif /* DEBUGT */
static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
static const char *timeout_message;
static void is_alive(const char *func, const char *message)
{
/* this routine checks whether the floppy driver is "alive" */
if (test_bit(0, &fdc_busy) && command_status < 2 &&
!delayed_work_pending(&fd_timeout)) {
DPRINT("%s: timeout handler died. %s\n", func, message);
}
}
static void (*do_floppy)(void) = NULL;
#define OLOGSIZE 20
static void (*lasthandler)(void);
static unsigned long interruptjiffies;
static unsigned long resultjiffies;
static int resultsize;
static unsigned long lastredo;
static struct output_log {
unsigned char data;
unsigned char status;
unsigned long jiffies;
} output_log[OLOGSIZE];
static int output_log_pos;
#define MAXTIMEOUT -2
static void __reschedule_timeout(int drive, const char *message)
{
unsigned long delay;
if (drive < 0 || drive >= N_DRIVE) {
delay = 20UL * HZ;
drive = 0;
} else
delay = drive_params[drive].timeout;
mod_delayed_work(floppy_wq, &fd_timeout, delay);
if (drive_params[drive].flags & FD_DEBUG)
DPRINT("reschedule timeout %s\n", message);
timeout_message = message;
}
static void reschedule_timeout(int drive, const char *message)
{
unsigned long flags;
spin_lock_irqsave(&floppy_lock, flags);
__reschedule_timeout(drive, message);
spin_unlock_irqrestore(&floppy_lock, flags);
}
#define INFBOUND(a, b) (a) = max_t(int, a, b)
#define SUPBOUND(a, b) (a) = min_t(int, a, b)
/*
* Bottom half floppy driver.
* ==========================
*
* This part of the file contains the code talking directly to the hardware,
* and also the main service loop (seek-configure-spinup-command)
*/
/*
* disk change.
* This routine is responsible for maintaining the FD_DISK_CHANGE flag,
* and the last_checked date.
*
* last_checked is the date of the last check which showed 'no disk change'
* FD_DISK_CHANGE is set under two conditions:
* 1. The floppy has been changed after some i/o to that floppy already
* took place.
* 2. No floppy disk is in the drive. This is done in order to ensure that
* requests are quickly flushed in case there is no disk in the drive. It
* follows that FD_DISK_CHANGE can only be cleared if there is a disk in
* the drive.
*
* For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
* For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
* each seek. If a disk is present, the disk change line should also be
* cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
* change line is set, this means either that no disk is in the drive, or
* that it has been removed since the last seek.
*
* This means that we really have a third possibility too:
* The floppy has been changed after the last seek.
*/
static int disk_change(int drive)
{
int fdc = FDC(drive);
if (time_before(jiffies, drive_state[drive].select_date + drive_params[drive].select_delay))
DPRINT("WARNING disk change called early\n");
if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))) ||
(fdc_state[fdc].dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
DPRINT("probing disk change on unselected drive\n");
DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
(unsigned int)fdc_state[fdc].dor);
}
debug_dcl(drive_params[drive].flags,
"checking disk change line for drive %d\n", drive);
debug_dcl(drive_params[drive].flags, "jiffies=%lu\n", jiffies);
debug_dcl(drive_params[drive].flags, "disk change line=%x\n",
fdc_inb(fdc, FD_DIR) & 0x80);
debug_dcl(drive_params[drive].flags, "flags=%lx\n",
drive_state[drive].flags);
if (drive_params[drive].flags & FD_BROKEN_DCL)
return test_bit(FD_DISK_CHANGED_BIT,
&drive_state[drive].flags);
if ((fdc_inb(fdc, FD_DIR) ^ drive_params[drive].flags) & 0x80) {
set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
/* verify write protection */
if (drive_state[drive].maxblock) /* mark it changed */
set_bit(FD_DISK_CHANGED_BIT,
&drive_state[drive].flags);
/* invalidate its geometry */
if (drive_state[drive].keep_data >= 0) {
if ((drive_params[drive].flags & FTD_MSG) &&
current_type[drive] != NULL)
DPRINT("Disk type is undefined after disk change\n");
current_type[drive] = NULL;
floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
}
return 1;
} else {
drive_state[drive].last_checked = jiffies;
clear_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags);
}
return 0;
}
static inline int is_selected(int dor, int unit)
{
return ((dor & (0x10 << unit)) && (dor & 3) == unit);
}
static bool is_ready_state(int status)
{
int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
return state == STATUS_READY;
}
static int set_dor(int fdc, char mask, char data)
{
unsigned char unit;
unsigned char drive;
unsigned char newdor;
unsigned char olddor;
if (fdc_state[fdc].address == -1)
return -1;
olddor = fdc_state[fdc].dor;
newdor = (olddor & mask) | data;
if (newdor != olddor) {
unit = olddor & 0x3;
if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
drive = REVDRIVE(fdc, unit);
debug_dcl(drive_params[drive].flags,
"calling disk change from set_dor\n");
disk_change(drive);
}
fdc_state[fdc].dor = newdor;
fdc_outb(newdor, fdc, FD_DOR);
unit = newdor & 0x3;
if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
drive = REVDRIVE(fdc, unit);
drive_state[drive].select_date = jiffies;
}
}
return olddor;
}
static void twaddle(int fdc, int drive)
{
if (drive_params[drive].select_delay)
return;
fdc_outb(fdc_state[fdc].dor & ~(0x10 << UNIT(drive)),
fdc, FD_DOR);
fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
drive_state[drive].select_date = jiffies;
}
/*
* Reset all driver information about the specified fdc.
* This is needed after a reset, and after a raw command.
*/
static void reset_fdc_info(int fdc, int mode)
{
int drive;
fdc_state[fdc].spec1 = fdc_state[fdc].spec2 = -1;
fdc_state[fdc].need_configure = 1;
fdc_state[fdc].perp_mode = 1;
fdc_state[fdc].rawcmd = 0;
for (drive = 0; drive < N_DRIVE; drive++)
if (FDC(drive) == fdc &&
(mode || drive_state[drive].track != NEED_1_RECAL))
drive_state[drive].track = NEED_2_RECAL;
}
/*
* selects the fdc and drive, and enables the fdc's input/dma.
* Both current_drive and current_fdc are changed to match the new drive.
*/
static void set_fdc(int drive)
{
unsigned int fdc;
if (drive < 0 || drive >= N_DRIVE) {
pr_info("bad drive value %d\n", drive);
return;
}
fdc = FDC(drive);
if (fdc >= N_FDC) {
pr_info("bad fdc value\n");
return;
}
set_dor(fdc, ~0, 8);
#if N_FDC > 1
set_dor(1 - fdc, ~8, 0);
#endif
if (fdc_state[fdc].rawcmd == 2)
reset_fdc_info(fdc, 1);
if (fdc_inb(fdc, FD_STATUS) != STATUS_READY)
fdc_state[fdc].reset = 1;
current_drive = drive;
current_fdc = fdc;
}
/*
* locks the driver.
* Both current_drive and current_fdc are changed to match the new drive.
*/
static int lock_fdc(int drive)
{
if (WARN(atomic_read(&usage_count) == 0,
"Trying to lock fdc while usage count=0\n"))
return -1;
if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
return -EINTR;
command_status = FD_COMMAND_NONE;
reschedule_timeout(drive, "lock fdc");
set_fdc(drive);
return 0;
}
/* unlocks the driver */
static void unlock_fdc(void)
{
if (!test_bit(0, &fdc_busy))
DPRINT("FDC access conflict!\n");
raw_cmd = NULL;
command_status = FD_COMMAND_NONE;
cancel_delayed_work(&fd_timeout);
do_floppy = NULL;
cont = NULL;
clear_bit(0, &fdc_busy);
wake_up(&fdc_wait);
}
/* switches the motor off after a given timeout */
static void motor_off_callback(struct timer_list *t)
{
unsigned long nr = t - motor_off_timer;
unsigned char mask = ~(0x10 << UNIT(nr));
if (WARN_ON_ONCE(nr >= N_DRIVE))
return;
set_dor(FDC(nr), mask, 0);
}
/* schedules motor off */
static void floppy_off(unsigned int drive)
{
unsigned long volatile delta;
int fdc = FDC(drive);
if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))))
return;
del_timer(motor_off_timer + drive);
/* make spindle stop in a position which minimizes spinup time
* next time */
if (drive_params[drive].rps) {
delta = jiffies - drive_state[drive].first_read_date + HZ -
drive_params[drive].spindown_offset;
delta = ((delta * drive_params[drive].rps) % HZ) / drive_params[drive].rps;
motor_off_timer[drive].expires =
jiffies + drive_params[drive].spindown - delta;
}
add_timer(motor_off_timer + drive);
}
/*
* cycle through all N_DRIVE floppy drives, for disk change testing.
* stopping at current drive. This is done before any long operation, to
* be sure to have up to date disk change information.
*/
static void scandrives(void)
{
int i;
int drive;
int saved_drive;
if (drive_params[current_drive].select_delay)
return;
saved_drive = current_drive;
for (i = 0; i < N_DRIVE; i++) {
drive = (saved_drive + i + 1) % N_DRIVE;
if (drive_state[drive].fd_ref == 0 || drive_params[drive].select_delay != 0)
continue; /* skip closed drives */
set_fdc(drive);
if (!(set_dor(current_fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
(0x10 << UNIT(drive))))
/* switch the motor off again, if it was off to
* begin with */
set_dor(current_fdc, ~(0x10 << UNIT(drive)), 0);
}
set_fdc(saved_drive);
}
static void empty(void)
{
}
static void (*floppy_work_fn)(void);
static void floppy_work_workfn(struct work_struct *work)
{
floppy_work_fn();
}
static DECLARE_WORK(floppy_work, floppy_work_workfn);
static void schedule_bh(void (*handler)(void))
{
WARN_ON(work_pending(&floppy_work));