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Diffstat (limited to 'drivers/block/floppy.c')
| -rw-r--r-- | drivers/block/floppy.c | 5027 |
1 files changed, 5027 insertions, 0 deletions
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c new file mode 100644 index 000000000..487840e35 --- /dev/null +++ b/drivers/block/floppy.c @@ -0,0 +1,5027 @@ +// 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 entropy@wintermute.wpi.edu (Lawrence Foard). Linus. + */ + +/* + * Automatic floppy-detection and formatting written by Werner Almesberger + * (almesber@nessie.cs.id.ethz.ch), 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 (hooft@chem.ruu.nl) + * 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 <rgooch@atnf.csiro.au> -- 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 <acme@conectiva.com.br> + * - 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 <bellucda@tiscali.it>. + * 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)); + + floppy_work_fn = handler; + queue_work(floppy_wq, &floppy_work); +} + +static void (*fd_timer_fn)(void) = NULL; + +static void fd_timer_workfn(struct work_struct *work) +{ + fd_timer_fn(); +} + +static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn); + +static void cancel_activity(void) +{ + do_floppy = NULL; + cancel_delayed_work(&fd_timer); + cancel_work_sync(&floppy_work); +} + +/* this function makes sure that the disk stays in the drive during the + * transfer */ +static void fd_watchdog(void) +{ + debug_dcl(drive_params[current_drive].flags, + "calling disk change from watchdog\n"); + + if (disk_change(current_drive)) { + DPRINT("disk removed during i/o\n"); + cancel_activity(); + cont->done(0); + reset_fdc(); + } else { + cancel_delayed_work(&fd_timer); + fd_timer_fn = fd_watchdog; + queue_delayed_work(floppy_wq, &fd_timer, HZ / 10); + } +} + +static void main_command_interrupt(void) +{ + cancel_delayed_work(&fd_timer); + cont->interrupt(); +} + +/* waits for a delay (spinup or select) to pass */ +static int fd_wait_for_completion(unsigned long expires, + void (*function)(void)) +{ + if (fdc_state[current_fdc].reset) { + reset_fdc(); /* do the reset during sleep to win time + * if we don't need to sleep, it's a good + * occasion anyways */ + return 1; + } + + if (time_before(jiffies, expires)) { + cancel_delayed_work(&fd_timer); + fd_timer_fn = function; + queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies); + return 1; + } + return 0; +} + +static void setup_DMA(void) +{ + unsigned long f; + + if (raw_cmd->length == 0) { + print_hex_dump(KERN_INFO, "zero dma transfer size: ", + DUMP_PREFIX_NONE, 16, 1, + raw_cmd->fullcmd, raw_cmd->cmd_count, false); + cont->done(0); + fdc_state[current_fdc].reset = 1; + return; + } + if (((unsigned long)raw_cmd->kernel_data) % 512) { + pr_info("non aligned address: %p\n", raw_cmd->kernel_data); + cont->done(0); + fdc_state[current_fdc].reset = 1; + return; + } + f = claim_dma_lock(); + fd_disable_dma(); +#ifdef fd_dma_setup + if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length, + (raw_cmd->flags & FD_RAW_READ) ? + DMA_MODE_READ : DMA_MODE_WRITE, + fdc_state[current_fdc].address) < 0) { + release_dma_lock(f); + cont->done(0); + fdc_state[current_fdc].reset = 1; + return; + } + release_dma_lock(f); +#else + fd_clear_dma_ff(); + fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length); + fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ? + DMA_MODE_READ : DMA_MODE_WRITE); + fd_set_dma_addr(raw_cmd->kernel_data); + fd_set_dma_count(raw_cmd->length); + virtual_dma_port = fdc_state[current_fdc].address; + fd_enable_dma(); + release_dma_lock(f); +#endif +} + +static void show_floppy(int fdc); + +/* waits until the fdc becomes ready */ +static int wait_til_ready(int fdc) +{ + int status; + int counter; + + if (fdc_state[fdc].reset) + return -1; + for (counter = 0; counter < 10000; counter++) { + status = fdc_inb(fdc, FD_STATUS); + if (status & STATUS_READY) + return status; + } + if (initialized) { + DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc); + show_floppy(fdc); + } + fdc_state[fdc].reset = 1; + return -1; +} + +/* sends a command byte to the fdc */ +static int output_byte(int fdc, char byte) +{ + int status = wait_til_ready(fdc); + + if (status < 0) + return -1; + + if (is_ready_state(status)) { + fdc_outb(byte, fdc, FD_DATA); + output_log[output_log_pos].data = byte; + output_log[output_log_pos].status = status; + output_log[output_log_pos].jiffies = jiffies; + output_log_pos = (output_log_pos + 1) % OLOGSIZE; + return 0; + } + fdc_state[fdc].reset = 1; + if (initialized) { + DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n", + byte, fdc, status); + show_floppy(fdc); + } + return -1; +} + +/* gets the response from the fdc */ +static int result(int fdc) +{ + int i; + int status = 0; + + for (i = 0; i < FD_RAW_REPLY_SIZE; i++) { + status = wait_til_ready(fdc); + if (status < 0) + break; + status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA; + if ((status & ~STATUS_BUSY) == STATUS_READY) { + resultjiffies = jiffies; + resultsize = i; + return i; + } + if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY)) + reply_buffer[i] = fdc_inb(fdc, FD_DATA); + else + break; + } + if (initialized) { + DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n", + fdc, status, i); + show_floppy(fdc); + } + fdc_state[fdc].reset = 1; + return -1; +} + +#define MORE_OUTPUT -2 +/* does the fdc need more output? */ +static int need_more_output(int fdc) +{ + int status = wait_til_ready(fdc); + + if (status < 0) + return -1; + + if (is_ready_state(status)) + return MORE_OUTPUT; + + return result(fdc); +} + +/* Set perpendicular mode as required, based on data rate, if supported. + * 82077 Now tested. 1Mbps data rate only possible with 82077-1. + */ +static void perpendicular_mode(int fdc) +{ + unsigned char perp_mode; + + if (raw_cmd->rate & 0x40) { + switch (raw_cmd->rate & 3) { + case 0: + perp_mode = 2; + break; + case 3: + perp_mode = 3; + break; + default: + DPRINT("Invalid data rate for perpendicular mode!\n"); + cont->done(0); + fdc_state[fdc].reset = 1; + /* + * convenient way to return to + * redo without too much hassle + * (deep stack et al.) + */ + return; + } + } else + perp_mode = 0; + + if (fdc_state[fdc].perp_mode == perp_mode) + return; + if (fdc_state[fdc].version >= FDC_82077_ORIG) { + output_byte(fdc, FD_PERPENDICULAR); + output_byte(fdc, perp_mode); + fdc_state[fdc].perp_mode = perp_mode; + } else if (perp_mode) { + DPRINT("perpendicular mode not supported by this FDC.\n"); + } +} /* perpendicular_mode */ + +static int fifo_depth = 0xa; +static int no_fifo; + +static int fdc_configure(int fdc) +{ + /* Turn on FIFO */ + output_byte(fdc, FD_CONFIGURE); + if (need_more_output(fdc) != MORE_OUTPUT) + return 0; + output_byte(fdc, 0); + output_byte(fdc, 0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf)); + output_byte(fdc, 0); /* pre-compensation from track 0 upwards */ + return 1; +} + +#define NOMINAL_DTR 500 + +/* Issue a "SPECIFY" command to set the step rate time, head unload time, + * head load time, and DMA disable flag to values needed by floppy. + * + * The value "dtr" is the data transfer rate in Kbps. It is needed + * to account for the data rate-based scaling done by the 82072 and 82077 + * FDC types. This parameter is ignored for other types of FDCs (i.e. + * 8272a). + * + * Note that changing the data transfer rate has a (probably deleterious) + * effect on the parameters subject to scaling for 82072/82077 FDCs, so + * fdc_specify is called again after each data transfer rate + * change. + * + * srt: 1000 to 16000 in microseconds + * hut: 16 to 240 milliseconds + * hlt: 2 to 254 milliseconds + * + * These values are rounded up to the next highest available delay time. + */ +static void fdc_specify(int fdc, int drive) +{ + unsigned char spec1; + unsigned char spec2; + unsigned long srt; + unsigned long hlt; + unsigned long hut; + unsigned long dtr = NOMINAL_DTR; + unsigned long scale_dtr = NOMINAL_DTR; + int hlt_max_code = 0x7f; + int hut_max_code = 0xf; + + if (fdc_state[fdc].need_configure && + fdc_state[fdc].version >= FDC_82072A) { + fdc_configure(fdc); + fdc_state[fdc].need_configure = 0; + } + + switch (raw_cmd->rate & 0x03) { + case 3: + dtr = 1000; + break; + case 1: + dtr = 300; + if (fdc_state[fdc].version >= FDC_82078) { + /* chose the default rate table, not the one + * where 1 = 2 Mbps */ + output_byte(fdc, FD_DRIVESPEC); + if (need_more_output(fdc) == MORE_OUTPUT) { + output_byte(fdc, UNIT(drive)); + output_byte(fdc, 0xc0); + } + } + break; + case 2: + dtr = 250; + break; + } + + if (fdc_state[fdc].version >= FDC_82072) { + scale_dtr = dtr; + hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */ + hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */ + } + + /* Convert step rate from microseconds to milliseconds and 4 bits */ + srt = 16 - DIV_ROUND_UP(drive_params[drive].srt * scale_dtr / 1000, + NOMINAL_DTR); + if (slow_floppy) + srt = srt / 4; + + SUPBOUND(srt, 0xf); + INFBOUND(srt, 0); + + hlt = DIV_ROUND_UP(drive_params[drive].hlt * scale_dtr / 2, + NOMINAL_DTR); + if (hlt < 0x01) + hlt = 0x01; + else if (hlt > 0x7f) + hlt = hlt_max_code; + + hut = DIV_ROUND_UP(drive_params[drive].hut * scale_dtr / 16, + NOMINAL_DTR); + if (hut < 0x1) + hut = 0x1; + else if (hut > 0xf) + hut = hut_max_code; + + spec1 = (srt << 4) | hut; + spec2 = (hlt << 1) | (use_virtual_dma & 1); + + /* If these parameters did not change, just return with success */ + if (fdc_state[fdc].spec1 != spec1 || + fdc_state[fdc].spec2 != spec2) { + /* Go ahead and set spec1 and spec2 */ + output_byte(fdc, FD_SPECIFY); + output_byte(fdc, fdc_state[fdc].spec1 = spec1); + output_byte(fdc, fdc_state[fdc].spec2 = spec2); + } +} /* fdc_specify */ + +/* Set the FDC's data transfer rate on behalf of the specified drive. + * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue + * of the specify command (i.e. using the fdc_specify function). + */ +static int fdc_dtr(void) +{ + /* If data rate not already set to desired value, set it. */ + if ((raw_cmd->rate & 3) == fdc_state[current_fdc].dtr) + return 0; + + /* Set dtr */ + fdc_outb(raw_cmd->rate & 3, current_fdc, FD_DCR); + + /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB) + * need a stabilization period of several milliseconds to be + * enforced after data rate changes before R/W operations. + * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies) + */ + fdc_state[current_fdc].dtr = raw_cmd->rate & 3; + return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready); +} /* fdc_dtr */ + +static void tell_sector(void) +{ + pr_cont(": track %d, head %d, sector %d, size %d", + reply_buffer[R_TRACK], reply_buffer[R_HEAD], + reply_buffer[R_SECTOR], + reply_buffer[R_SIZECODE]); +} /* tell_sector */ + +static void print_errors(void) +{ + DPRINT(""); + if (reply_buffer[ST0] & ST0_ECE) { + pr_cont("Recalibrate failed!"); + } else if (reply_buffer[ST2] & ST2_CRC) { + pr_cont("data CRC error"); + tell_sector(); + } else if (reply_buffer[ST1] & ST1_CRC) { + pr_cont("CRC error"); + tell_sector(); + } else if ((reply_buffer[ST1] & (ST1_MAM | ST1_ND)) || + (reply_buffer[ST2] & ST2_MAM)) { + if (!probing) { + pr_cont("sector not found"); + tell_sector(); + } else + pr_cont("probe failed..."); + } else if (reply_buffer[ST2] & ST2_WC) { /* seek error */ + pr_cont("wrong cylinder"); + } else if (reply_buffer[ST2] & ST2_BC) { /* cylinder marked as bad */ + pr_cont("bad cylinder"); + } else { + pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", + reply_buffer[ST0], reply_buffer[ST1], + reply_buffer[ST2]); + tell_sector(); + } + pr_cont("\n"); +} + +/* + * OK, this error interpreting routine is called after a + * DMA read/write has succeeded + * or failed, so we check the results, and copy any buffers. + * hhb: Added better error reporting. + * ak: Made this into a separate routine. + */ +static int interpret_errors(void) +{ + char bad; + + if (inr != 7) { + DPRINT("-- FDC reply error\n"); + fdc_state[current_fdc].reset = 1; + return 1; + } + + /* check IC to find cause of interrupt */ + switch (reply_buffer[ST0] & ST0_INTR) { + case 0x40: /* error occurred during command execution */ + if (reply_buffer[ST1] & ST1_EOC) + return 0; /* occurs with pseudo-DMA */ + bad = 1; + if (reply_buffer[ST1] & ST1_WP) { + DPRINT("Drive is write protected\n"); + clear_bit(FD_DISK_WRITABLE_BIT, + &drive_state[current_drive].flags); + cont->done(0); + bad = 2; + } else if (reply_buffer[ST1] & ST1_ND) { + set_bit(FD_NEED_TWADDLE_BIT, + &drive_state[current_drive].flags); + } else if (reply_buffer[ST1] & ST1_OR) { + if (drive_params[current_drive].flags & FTD_MSG) + DPRINT("Over/Underrun - retrying\n"); + bad = 0; + } else if (floppy_errors >= drive_params[current_drive].max_errors.reporting) { + print_errors(); + } + if (reply_buffer[ST2] & ST2_WC || reply_buffer[ST2] & ST2_BC) + /* wrong cylinder => recal */ + drive_state[current_drive].track = NEED_2_RECAL; + return bad; + case 0x80: /* invalid command given */ + DPRINT("Invalid FDC command given!\n"); + cont->done(0); + return 2; + case 0xc0: + DPRINT("Abnormal termination caused by polling\n"); + cont->error(); + return 2; + default: /* (0) Normal command termination */ + return 0; + } +} + +/* + * This routine is called when everything should be correctly set up + * for the transfer (i.e. floppy motor is on, the correct floppy is + * selected, and the head is sitting on the right track). + */ +static void setup_rw_floppy(void) +{ + int i; + int r; + int flags; + unsigned long ready_date; + void (*function)(void); + + flags = raw_cmd->flags; + if (flags & (FD_RAW_READ | FD_RAW_WRITE)) + flags |= FD_RAW_INTR; + + if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) { + ready_date = drive_state[current_drive].spinup_date + drive_params[current_drive].spinup; + /* If spinup will take a long time, rerun scandrives + * again just before spinup completion. Beware that + * after scandrives, we must again wait for selection. + */ + if (time_after(ready_date, jiffies + drive_params[current_drive].select_delay)) { + ready_date -= drive_params[current_drive].select_delay; + function = floppy_start; + } else + function = setup_rw_floppy; + + /* wait until the floppy is spinning fast enough */ + if (fd_wait_for_completion(ready_date, function)) + return; + } + if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE)) + setup_DMA(); + + if (flags & FD_RAW_INTR) + do_floppy = main_command_interrupt; + + r = 0; + for (i = 0; i < raw_cmd->cmd_count; i++) + r |= output_byte(current_fdc, raw_cmd->fullcmd[i]); + + debugt(__func__, "rw_command"); + + if (r) { + cont->error(); + reset_fdc(); + return; + } + + if (!(flags & FD_RAW_INTR)) { + inr = result(current_fdc); + cont->interrupt(); + } else if (flags & FD_RAW_NEED_DISK) + fd_watchdog(); +} + +static int blind_seek; + +/* + * This is the routine called after every seek (or recalibrate) interrupt + * from the floppy controller. + */ +static void seek_interrupt(void) +{ + debugt(__func__, ""); + if (inr != 2 || (reply_buffer[ST0] & 0xF8) != 0x20) { + DPRINT("seek failed\n"); + drive_state[current_drive].track = NEED_2_RECAL; + cont->error(); + cont->redo(); + return; + } + if (drive_state[current_drive].track >= 0 && + drive_state[current_drive].track != reply_buffer[ST1] && + !blind_seek) { + debug_dcl(drive_params[current_drive].flags, + "clearing NEWCHANGE flag because of effective seek\n"); + debug_dcl(drive_params[current_drive].flags, "jiffies=%lu\n", + jiffies); + clear_bit(FD_DISK_NEWCHANGE_BIT, + &drive_state[current_drive].flags); + /* effective seek */ + drive_state[current_drive].select_date = jiffies; + } + drive_state[current_drive].track = reply_buffer[ST1]; + floppy_ready(); +} + +static void check_wp(int fdc, int drive) +{ + if (test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) { + /* check write protection */ + output_byte(fdc, FD_GETSTATUS); + output_byte(fdc, UNIT(drive)); + if (result(fdc) != 1) { + fdc_state[fdc].reset = 1; + return; + } + clear_bit(FD_VERIFY_BIT, &drive_state[drive].flags); + clear_bit(FD_NEED_TWADDLE_BIT, + &drive_state[drive].flags); + debug_dcl(drive_params[drive].flags, + "checking whether disk is write protected\n"); + debug_dcl(drive_params[drive].flags, "wp=%x\n", + reply_buffer[ST3] & 0x40); + if (!(reply_buffer[ST3] & 0x40)) + set_bit(FD_DISK_WRITABLE_BIT, + &drive_state[drive].flags); + else + clear_bit(FD_DISK_WRITABLE_BIT, + &drive_state[drive].flags); + } +} + +static void seek_floppy(void) +{ + int track; + + blind_seek = 0; + + debug_dcl(drive_params[current_drive].flags, + "calling disk change from %s\n", __func__); + + if (!test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) && + disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) { + /* the media changed flag should be cleared after the seek. + * If it isn't, this means that there is really no disk in + * the drive. + */ + set_bit(FD_DISK_CHANGED_BIT, + &drive_state[current_drive].flags); + cont->done(0); + cont->redo(); + return; + } + if (drive_state[current_drive].track <= NEED_1_RECAL) { + recalibrate_floppy(); + return; + } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) && + (raw_cmd->flags & FD_RAW_NEED_DISK) && + (drive_state[current_drive].track <= NO_TRACK || drive_state[current_drive].track == raw_cmd->track)) { + /* we seek to clear the media-changed condition. Does anybody + * know a more elegant way, which works on all drives? */ + if (raw_cmd->track) + track = raw_cmd->track - 1; + else { + if (drive_params[current_drive].flags & FD_SILENT_DCL_CLEAR) { + set_dor(current_fdc, ~(0x10 << UNIT(current_drive)), 0); + blind_seek = 1; + raw_cmd->flags |= FD_RAW_NEED_SEEK; + } + track = 1; + } + } else { + check_wp(current_fdc, current_drive); + if (raw_cmd->track != drive_state[current_drive].track && + (raw_cmd->flags & FD_RAW_NEED_SEEK)) + track = raw_cmd->track; + else { + setup_rw_floppy(); + return; + } + } + + do_floppy = seek_interrupt; + output_byte(current_fdc, FD_SEEK); + output_byte(current_fdc, UNIT(current_drive)); + if (output_byte(current_fdc, track) < 0) { + reset_fdc(); + return; + } + debugt(__func__, ""); +} + +static void recal_interrupt(void) +{ + debugt(__func__, ""); + if (inr != 2) + fdc_state[current_fdc].reset = 1; + else if (reply_buffer[ST0] & ST0_ECE) { + switch (drive_state[current_drive].track) { + case NEED_1_RECAL: + debugt(__func__, "need 1 recal"); + /* after a second recalibrate, we still haven't + * reached track 0. Probably no drive. Raise an + * error, as failing immediately might upset + * computers possessed by the Devil :-) */ + cont->error(); + cont->redo(); + return; + case NEED_2_RECAL: + debugt(__func__, "need 2 recal"); + /* If we already did a recalibrate, + * and we are not at track 0, this + * means we have moved. (The only way + * not to move at recalibration is to + * be already at track 0.) Clear the + * new change flag */ + debug_dcl(drive_params[current_drive].flags, + "clearing NEWCHANGE flag because of second recalibrate\n"); + + clear_bit(FD_DISK_NEWCHANGE_BIT, + &drive_state[current_drive].flags); + drive_state[current_drive].select_date = jiffies; + fallthrough; + default: + debugt(__func__, "default"); + /* Recalibrate moves the head by at + * most 80 steps. If after one + * recalibrate we don't have reached + * track 0, this might mean that we + * started beyond track 80. Try + * again. */ + drive_state[current_drive].track = NEED_1_RECAL; + break; + } + } else + drive_state[current_drive].track = reply_buffer[ST1]; + floppy_ready(); +} + +static void print_result(char *message, int inr) +{ + int i; + + DPRINT("%s ", message); + if (inr >= 0) + for (i = 0; i < inr; i++) + pr_cont("repl[%d]=%x ", i, reply_buffer[i]); + pr_cont("\n"); +} + +/* interrupt handler. Note that this can be called externally on the Sparc */ +irqreturn_t floppy_interrupt(int irq, void *dev_id) +{ + int do_print; + unsigned long f; + void (*handler)(void) = do_floppy; + + lasthandler = handler; + interruptjiffies = jiffies; + + f = claim_dma_lock(); + fd_disable_dma(); + release_dma_lock(f); + + do_floppy = NULL; + if (current_fdc >= N_FDC || fdc_state[current_fdc].address == -1) { + /* we don't even know which FDC is the culprit */ + pr_info("DOR0=%x\n", fdc_state[0].dor); + pr_info("floppy interrupt on bizarre fdc %d\n", current_fdc); + pr_info("handler=%ps\n", handler); + is_alive(__func__, "bizarre fdc"); + return IRQ_NONE; + } + + fdc_state[current_fdc].reset = 0; + /* We have to clear the reset flag here, because apparently on boxes + * with level triggered interrupts (PS/2, Sparc, ...), it is needed to + * emit SENSEI's to clear the interrupt line. And fdc_state[fdc].reset + * blocks the emission of the SENSEI's. + * It is OK to emit floppy commands because we are in an interrupt + * handler here, and thus we have to fear no interference of other + * activity. + */ + + do_print = !handler && print_unex && initialized; + + inr = result(current_fdc); + if (do_print) + print_result("unexpected interrupt", inr); + if (inr == 0) { + int max_sensei = 4; + do { + output_byte(current_fdc, FD_SENSEI); + inr = result(current_fdc); + if (do_print) + print_result("sensei", inr); + max_sensei--; + } while ((reply_buffer[ST0] & 0x83) != UNIT(current_drive) && + inr == 2 && max_sensei); + } + if (!handler) { + fdc_state[current_fdc].reset = 1; + return IRQ_NONE; + } + schedule_bh(handler); + is_alive(__func__, "normal interrupt end"); + + /* FIXME! Was it really for us? */ + return IRQ_HANDLED; +} + +static void recalibrate_floppy(void) +{ + debugt(__func__, ""); + do_floppy = recal_interrupt; + output_byte(current_fdc, FD_RECALIBRATE); + if (output_byte(current_fdc, UNIT(current_drive)) < 0) + reset_fdc(); +} + +/* + * Must do 4 FD_SENSEIs after reset because of ``drive polling''. + */ +static void reset_interrupt(void) +{ + debugt(__func__, ""); + result(current_fdc); /* get the status ready for set_fdc */ + if (fdc_state[current_fdc].reset) { + pr_info("reset set in interrupt, calling %ps\n", cont->error); + cont->error(); /* a reset just after a reset. BAD! */ + } + cont->redo(); +} + +/* + * reset is done by pulling bit 2 of DOR low for a while (old FDCs), + * or by setting the self clearing bit 7 of STATUS (newer FDCs). + * This WILL trigger an interrupt, causing the handlers in the current + * cont's ->redo() to be called via reset_interrupt(). + */ +static void reset_fdc(void) +{ + unsigned long flags; + + do_floppy = reset_interrupt; + fdc_state[current_fdc].reset = 0; + reset_fdc_info(current_fdc, 0); + + /* Pseudo-DMA may intercept 'reset finished' interrupt. */ + /* Irrelevant for systems with true DMA (i386). */ + + flags = claim_dma_lock(); + fd_disable_dma(); + release_dma_lock(flags); + + if (fdc_state[current_fdc].version >= FDC_82072A) + fdc_outb(0x80 | (fdc_state[current_fdc].dtr & 3), + current_fdc, FD_STATUS); + else { + fdc_outb(fdc_state[current_fdc].dor & ~0x04, current_fdc, FD_DOR); + udelay(FD_RESET_DELAY); + fdc_outb(fdc_state[current_fdc].dor, current_fdc, FD_DOR); + } +} + +static void show_floppy(int fdc) +{ + int i; + + pr_info("\n"); + pr_info("floppy driver state\n"); + pr_info("-------------------\n"); + pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%ps\n", + jiffies, interruptjiffies, jiffies - interruptjiffies, + lasthandler); + + pr_info("timeout_message=%s\n", timeout_message); + pr_info("last output bytes:\n"); + for (i = 0; i < OLOGSIZE; i++) + pr_info("%2x %2x %lu\n", + output_log[(i + output_log_pos) % OLOGSIZE].data, + output_log[(i + output_log_pos) % OLOGSIZE].status, + output_log[(i + output_log_pos) % OLOGSIZE].jiffies); + pr_info("last result at %lu\n", resultjiffies); + pr_info("last redo_fd_request at %lu\n", lastredo); + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, + reply_buffer, resultsize, true); + + pr_info("status=%x\n", fdc_inb(fdc, FD_STATUS)); + pr_info("fdc_busy=%lu\n", fdc_busy); + if (do_floppy) + pr_info("do_floppy=%ps\n", do_floppy); + if (work_pending(&floppy_work)) + pr_info("floppy_work.func=%ps\n", floppy_work.func); + if (delayed_work_pending(&fd_timer)) + pr_info("delayed work.function=%p expires=%ld\n", + fd_timer.work.func, + fd_timer.timer.expires - jiffies); + if (delayed_work_pending(&fd_timeout)) + pr_info("timer_function=%p expires=%ld\n", + fd_timeout.work.func, + fd_timeout.timer.expires - jiffies); + + pr_info("cont=%p\n", cont); + pr_info("current_req=%p\n", current_req); + pr_info("command_status=%d\n", command_status); + pr_info("\n"); +} + +static void floppy_shutdown(struct work_struct *arg) +{ + unsigned long flags; + + if (initialized) + show_floppy(current_fdc); + cancel_activity(); + + flags = claim_dma_lock(); + fd_disable_dma(); + release_dma_lock(flags); + + /* avoid dma going to a random drive after shutdown */ + + if (initialized) + DPRINT("floppy timeout called\n"); + fdc_state[current_fdc].reset = 1; + if (cont) { + cont->done(0); + cont->redo(); /* this will recall reset when needed */ + } else { + pr_info("no cont in shutdown!\n"); + process_fd_request(); + } + is_alive(__func__, ""); +} + +/* start motor, check media-changed condition and write protection */ +static int start_motor(void (*function)(void)) +{ + int mask; + int data; + + mask = 0xfc; + data = UNIT(current_drive); + if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) { + if (!(fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))) { + set_debugt(); + /* no read since this drive is running */ + drive_state[current_drive].first_read_date = 0; + /* note motor start time if motor is not yet running */ + drive_state[current_drive].spinup_date = jiffies; + data |= (0x10 << UNIT(current_drive)); + } + } else if (fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive))) + mask &= ~(0x10 << UNIT(current_drive)); + + /* starts motor and selects floppy */ + del_timer(motor_off_timer + current_drive); + set_dor(current_fdc, mask, data); + + /* wait_for_completion also schedules reset if needed. */ + return fd_wait_for_completion(drive_state[current_drive].select_date + drive_params[current_drive].select_delay, + function); +} + +static void floppy_ready(void) +{ + if (fdc_state[current_fdc].reset) { + reset_fdc(); + return; + } + if (start_motor(floppy_ready)) + return; + if (fdc_dtr()) + return; + + debug_dcl(drive_params[current_drive].flags, + "calling disk change from floppy_ready\n"); + if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) && + disk_change(current_drive) && !drive_params[current_drive].select_delay) + twaddle(current_fdc, current_drive); /* this clears the dcl on certain + * drive/controller combinations */ + +#ifdef fd_chose_dma_mode + if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) { + unsigned long flags = claim_dma_lock(); + fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length); + release_dma_lock(flags); + } +#endif + + if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) { + perpendicular_mode(current_fdc); + fdc_specify(current_fdc, current_drive); /* must be done here because of hut, hlt ... */ + seek_floppy(); + } else { + if ((raw_cmd->flags & FD_RAW_READ) || + (raw_cmd->flags & FD_RAW_WRITE)) + fdc_specify(current_fdc, current_drive); + setup_rw_floppy(); + } +} + +static void floppy_start(void) +{ + reschedule_timeout(current_drive, "floppy start"); + + scandrives(); + debug_dcl(drive_params[current_drive].flags, + "setting NEWCHANGE in floppy_start\n"); + set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags); + floppy_ready(); +} + +/* + * ======================================================================== + * here ends the bottom half. Exported routines are: + * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc, + * start_motor, reset_fdc, reset_fdc_info, interpret_errors. + * Initialization also uses output_byte, result, set_dor, floppy_interrupt + * and set_dor. + * ======================================================================== + */ +/* + * General purpose continuations. + * ============================== + */ + +static void do_wakeup(void) +{ + reschedule_timeout(MAXTIMEOUT, "do wakeup"); + cont = NULL; + command_status += 2; + wake_up(&command_done); +} + +static const struct cont_t wakeup_cont = { + .interrupt = empty, + .redo = do_wakeup, + .error = empty, + .done = (done_f)empty +}; + +static const struct cont_t intr_cont = { + .interrupt = empty, + .redo = process_fd_request, + .error = empty, + .done = (done_f)empty +}; + +/* schedules handler, waiting for completion. May be interrupted, will then + * return -EINTR, in which case the driver will automatically be unlocked. + */ +static int wait_til_done(void (*handler)(void), bool interruptible) +{ + int ret; + + schedule_bh(handler); + + if (interruptible) + wait_event_interruptible(command_done, command_status >= 2); + else + wait_event(command_done, command_status >= 2); + + if (command_status < 2) { + cancel_activity(); + cont = &intr_cont; + reset_fdc(); + return -EINTR; + } + + if (fdc_state[current_fdc].reset) + command_status = FD_COMMAND_ERROR; + if (command_status == FD_COMMAND_OKAY) + ret = 0; + else + ret = -EIO; + command_status = FD_COMMAND_NONE; + return ret; +} + +static void generic_done(int result) +{ + command_status = result; + cont = &wakeup_cont; +} + +static void generic_success(void) +{ + cont->done(1); +} + +static void generic_failure(void) +{ + cont->done(0); +} + +static void success_and_wakeup(void) +{ + generic_success(); + cont->redo(); +} + +/* + * formatting and rw support. + * ========================== + */ + +static int next_valid_format(int drive) +{ + int probed_format; + + probed_format = drive_state[drive].probed_format; + while (1) { + if (probed_format >= FD_AUTODETECT_SIZE || + !drive_params[drive].autodetect[probed_format]) { + drive_state[drive].probed_format = 0; + return 1; + } + if (floppy_type[drive_params[drive].autodetect[probed_format]].sect) { + drive_state[drive].probed_format = probed_format; + return 0; + } + probed_format++; + } +} + +static void bad_flp_intr(void) +{ + int err_count; + + if (probing) { + drive_state[current_drive].probed_format++; + if (!next_valid_format(current_drive)) + return; + } + err_count = ++floppy_errors; + INFBOUND(write_errors[current_drive].badness, err_count); + if (err_count > drive_params[current_drive].max_errors.abort) + cont->done(0); + if (err_count > drive_params[current_drive].max_errors.reset) + fdc_state[current_fdc].reset = 1; + else if (err_count > drive_params[current_drive].max_errors.recal) + drive_state[current_drive].track = NEED_2_RECAL; +} + +static void set_floppy(int drive) +{ + int type = ITYPE(drive_state[drive].fd_device); + + if (type) + _floppy = floppy_type + type; + else + _floppy = current_type[drive]; +} + +/* + * formatting support. + * =================== + */ +static void format_interrupt(void) +{ + switch (interpret_errors()) { + case 1: + cont->error(); + break; + case 2: + break; + case 0: + cont->done(1); + } + cont->redo(); +} + +#define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1)) +#define CT(x) ((x) | 0xc0) + +static void setup_format_params(int track) +{ + int n; + int il; + int count; + int head_shift; + int track_shift; + struct fparm { + unsigned char track, head, sect, size; + } *here = (struct fparm *)floppy_track_buffer; + + raw_cmd = &default_raw_cmd; + raw_cmd->track = track; + + raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN | + FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK); + raw_cmd->rate = _floppy->rate & 0x43; + raw_cmd->cmd_count = NR_F; + raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_FORMAT); + raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head); + raw_cmd->cmd[F_SIZECODE] = FD_SIZECODE(_floppy); + raw_cmd->cmd[F_SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[F_SIZECODE]; + raw_cmd->cmd[F_GAP] = _floppy->fmt_gap; + raw_cmd->cmd[F_FILL] = FD_FILL_BYTE; + + raw_cmd->kernel_data = floppy_track_buffer; + raw_cmd->length = 4 * raw_cmd->cmd[F_SECT_PER_TRACK]; + + if (!raw_cmd->cmd[F_SECT_PER_TRACK]) + return; + + /* allow for about 30ms for data transport per track */ + head_shift = (raw_cmd->cmd[F_SECT_PER_TRACK] + 5) / 6; + + /* a ``cylinder'' is two tracks plus a little stepping time */ + track_shift = 2 * head_shift + 3; + + /* position of logical sector 1 on this track */ + n = (track_shift * format_req.track + head_shift * format_req.head) + % raw_cmd->cmd[F_SECT_PER_TRACK]; + + /* determine interleave */ + il = 1; + if (_floppy->fmt_gap < 0x22) + il++; + + /* initialize field */ + for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) { + here[count].track = format_req.track; + here[count].head = format_req.head; + here[count].sect = 0; + here[count].size = raw_cmd->cmd[F_SIZECODE]; + } + /* place logical sectors */ + for (count = 1; count <= raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) { + here[n].sect = count; + n = (n + il) % raw_cmd->cmd[F_SECT_PER_TRACK]; + if (here[n].sect) { /* sector busy, find next free sector */ + ++n; + if (n >= raw_cmd->cmd[F_SECT_PER_TRACK]) { + n -= raw_cmd->cmd[F_SECT_PER_TRACK]; + while (here[n].sect) + ++n; + } + } + } + if (_floppy->stretch & FD_SECTBASEMASK) { + for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; count++) + here[count].sect += FD_SECTBASE(_floppy) - 1; + } +} + +static void redo_format(void) +{ + buffer_track = -1; + setup_format_params(format_req.track << STRETCH(_floppy)); + floppy_start(); + debugt(__func__, "queue format request"); +} + +static const struct cont_t format_cont = { + .interrupt = format_interrupt, + .redo = redo_format, + .error = bad_flp_intr, + .done = generic_done +}; + +static int do_format(int drive, struct format_descr *tmp_format_req) +{ + int ret; + + if (lock_fdc(drive)) + return -EINTR; + + set_floppy(drive); + if (!_floppy || + _floppy->track > drive_params[current_drive].tracks || + tmp_format_req->track >= _floppy->track || + tmp_format_req->head >= _floppy->head || + (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) || + !_floppy->fmt_gap) { + process_fd_request(); + return -EINVAL; + } + format_req = *tmp_format_req; + cont = &format_cont; + floppy_errors = 0; + ret = wait_til_done(redo_format, true); + if (ret == -EINTR) + return -EINTR; + process_fd_request(); + return ret; +} + +/* + * Buffer read/write and support + * ============================= + */ + +static void floppy_end_request(struct request *req, blk_status_t error) +{ + unsigned int nr_sectors = current_count_sectors; + unsigned int drive = (unsigned long)req->q->disk->private_data; + + /* current_count_sectors can be zero if transfer failed */ + if (error) + nr_sectors = blk_rq_cur_sectors(req); + if (blk_update_request(req, error, nr_sectors << 9)) + return; + __blk_mq_end_request(req, error); + + /* We're done with the request */ + floppy_off(drive); + current_req = NULL; +} + +/* new request_done. Can handle physical sectors which are smaller than a + * logical buffer */ +static void request_done(int uptodate) +{ + struct request *req = current_req; + int block; + char msg[sizeof("request done ") + sizeof(int) * 3]; + + probing = 0; + snprintf(msg, sizeof(msg), "request done %d", uptodate); + reschedule_timeout(MAXTIMEOUT, msg); + + if (!req) { + pr_info("floppy.c: no request in request_done\n"); + return; + } + + if (uptodate) { + /* maintain values for invalidation on geometry + * change */ + block = current_count_sectors + blk_rq_pos(req); + INFBOUND(drive_state[current_drive].maxblock, block); + if (block > _floppy->sect) + drive_state[current_drive].maxtrack = 1; + + floppy_end_request(req, 0); + } else { + if (rq_data_dir(req) == WRITE) { + /* record write error information */ + write_errors[current_drive].write_errors++; + if (write_errors[current_drive].write_errors == 1) { + write_errors[current_drive].first_error_sector = blk_rq_pos(req); + write_errors[current_drive].first_error_generation = drive_state[current_drive].generation; + } + write_errors[current_drive].last_error_sector = blk_rq_pos(req); + write_errors[current_drive].last_error_generation = drive_state[current_drive].generation; + } + floppy_end_request(req, BLK_STS_IOERR); + } +} + +/* Interrupt handler evaluating the result of the r/w operation */ +static void rw_interrupt(void) +{ + int eoc; + int ssize; + int heads; + int nr_sectors; + + if (reply_buffer[R_HEAD] >= 2) { + /* some Toshiba floppy controllers occasionnally seem to + * return bogus interrupts after read/write operations, which + * can be recognized by a bad head number (>= 2) */ + return; + } + + if (!drive_state[current_drive].first_read_date) + drive_state[current_drive].first_read_date = jiffies; + + ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4); + + if (reply_buffer[ST1] & ST1_EOC) + eoc = 1; + else + eoc = 0; + + if (raw_cmd->cmd[COMMAND] & 0x80) + heads = 2; + else + heads = 1; + + nr_sectors = (((reply_buffer[R_TRACK] - raw_cmd->cmd[TRACK]) * heads + + reply_buffer[R_HEAD] - raw_cmd->cmd[HEAD]) * raw_cmd->cmd[SECT_PER_TRACK] + + reply_buffer[R_SECTOR] - raw_cmd->cmd[SECTOR] + eoc) << raw_cmd->cmd[SIZECODE] >> 2; + + if (nr_sectors / ssize > + DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) { + DPRINT("long rw: %x instead of %lx\n", + nr_sectors, current_count_sectors); + pr_info("rs=%d s=%d\n", reply_buffer[R_SECTOR], + raw_cmd->cmd[SECTOR]); + pr_info("rh=%d h=%d\n", reply_buffer[R_HEAD], + raw_cmd->cmd[HEAD]); + pr_info("rt=%d t=%d\n", reply_buffer[R_TRACK], + raw_cmd->cmd[TRACK]); + pr_info("heads=%d eoc=%d\n", heads, eoc); + pr_info("spt=%d st=%d ss=%d\n", + raw_cmd->cmd[SECT_PER_TRACK], fsector_t, ssize); + pr_info("in_sector_offset=%d\n", in_sector_offset); + } + + nr_sectors -= in_sector_offset; + INFBOUND(nr_sectors, 0); + SUPBOUND(current_count_sectors, nr_sectors); + + switch (interpret_errors()) { + case 2: + cont->redo(); + return; + case 1: + if (!current_count_sectors) { + cont->error(); + cont->redo(); + return; + } + break; + case 0: + if (!current_count_sectors) { + cont->redo(); + return; + } + current_type[current_drive] = _floppy; + floppy_sizes[TOMINOR(current_drive)] = _floppy->size; + break; + } + + if (probing) { + if (drive_params[current_drive].flags & FTD_MSG) + DPRINT("Auto-detected floppy type %s in fd%d\n", + _floppy->name, current_drive); + current_type[current_drive] = _floppy; + floppy_sizes[TOMINOR(current_drive)] = _floppy->size; + probing = 0; + } + + if (CT(raw_cmd->cmd[COMMAND]) != FD_READ) { + /* transfer directly from buffer */ + cont->done(1); + } else { + buffer_track = raw_cmd->track; + buffer_drive = current_drive; + INFBOUND(buffer_max, nr_sectors + fsector_t); + } + cont->redo(); +} + +/* Compute the maximal transfer size */ +static int transfer_size(int ssize, int max_sector, int max_size) +{ + SUPBOUND(max_sector, fsector_t + max_size); + + /* alignment */ + max_sector -= (max_sector % _floppy->sect) % ssize; + + /* transfer size, beginning not aligned */ + current_count_sectors = max_sector - fsector_t; + + return max_sector; +} + +/* + * Move data from/to the track buffer to/from the buffer cache. + */ +static void copy_buffer(int ssize, int max_sector, int max_sector_2) +{ + int remaining; /* number of transferred 512-byte sectors */ + struct bio_vec bv; + char *dma_buffer; + int size; + struct req_iterator iter; + + max_sector = transfer_size(ssize, + min(max_sector, max_sector_2), + blk_rq_sectors(current_req)); + + if (current_count_sectors <= 0 && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE && + buffer_max > fsector_t + blk_rq_sectors(current_req)) + current_count_sectors = min_t(int, buffer_max - fsector_t, + blk_rq_sectors(current_req)); + + remaining = current_count_sectors << 9; + if (remaining > blk_rq_bytes(current_req) && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { + DPRINT("in copy buffer\n"); + pr_info("current_count_sectors=%ld\n", current_count_sectors); + pr_info("remaining=%d\n", remaining >> 9); + pr_info("current_req->nr_sectors=%u\n", + blk_rq_sectors(current_req)); + pr_info("current_req->current_nr_sectors=%u\n", + blk_rq_cur_sectors(current_req)); + pr_info("max_sector=%d\n", max_sector); + pr_info("ssize=%d\n", ssize); + } + + buffer_max = max(max_sector, buffer_max); + + dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9); + + size = blk_rq_cur_bytes(current_req); + + rq_for_each_segment(bv, current_req, iter) { + if (!remaining) + break; + + size = bv.bv_len; + SUPBOUND(size, remaining); + if (dma_buffer + size > + floppy_track_buffer + (max_buffer_sectors << 10) || + dma_buffer < floppy_track_buffer) { + DPRINT("buffer overrun in copy buffer %d\n", + (int)((floppy_track_buffer - dma_buffer) >> 9)); + pr_info("fsector_t=%d buffer_min=%d\n", + fsector_t, buffer_min); + pr_info("current_count_sectors=%ld\n", + current_count_sectors); + if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) + pr_info("read\n"); + if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) + pr_info("write\n"); + break; + } + + if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) + memcpy_to_bvec(&bv, dma_buffer); + else + memcpy_from_bvec(dma_buffer, &bv); + + remaining -= size; + dma_buffer += size; + } + if (remaining) { + if (remaining > 0) + max_sector -= remaining >> 9; + DPRINT("weirdness: remaining %d\n", remaining >> 9); + } +} + +/* work around a bug in pseudo DMA + * (on some FDCs) pseudo DMA does not stop when the CPU stops + * sending data. Hence we need a different way to signal the + * transfer length: We use raw_cmd->cmd[SECT_PER_TRACK]. Unfortunately, this + * does not work with MT, hence we can only transfer one head at + * a time + */ +static void virtualdmabug_workaround(void) +{ + int hard_sectors; + int end_sector; + + if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { + raw_cmd->cmd[COMMAND] &= ~0x80; /* switch off multiple track mode */ + + hard_sectors = raw_cmd->length >> (7 + raw_cmd->cmd[SIZECODE]); + end_sector = raw_cmd->cmd[SECTOR] + hard_sectors - 1; + if (end_sector > raw_cmd->cmd[SECT_PER_TRACK]) { + pr_info("too many sectors %d > %d\n", + end_sector, raw_cmd->cmd[SECT_PER_TRACK]); + return; + } + raw_cmd->cmd[SECT_PER_TRACK] = end_sector; + /* make sure raw_cmd->cmd[SECT_PER_TRACK] + * points to end of transfer */ + } +} + +/* + * Formulate a read/write request. + * this routine decides where to load the data (directly to buffer, or to + * tmp floppy area), how much data to load (the size of the buffer, the whole + * track, or a single sector) + * All floppy_track_buffer handling goes in here. If we ever add track buffer + * allocation on the fly, it should be done here. No other part should need + * modification. + */ + +static int make_raw_rw_request(void) +{ + int aligned_sector_t; + int max_sector; + int max_size; + int tracksize; + int ssize; + + if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n")) + return 0; + + set_fdc((long)current_req->q->disk->private_data); + + raw_cmd = &default_raw_cmd; + raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK; + raw_cmd->cmd_count = NR_RW; + if (rq_data_dir(current_req) == READ) { + raw_cmd->flags |= FD_RAW_READ; + raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ); + } else if (rq_data_dir(current_req) == WRITE) { + raw_cmd->flags |= FD_RAW_WRITE; + raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_WRITE); + } else { + DPRINT("%s: unknown command\n", __func__); + return 0; + } + + max_sector = _floppy->sect * _floppy->head; + + raw_cmd->cmd[TRACK] = (int)blk_rq_pos(current_req) / max_sector; + fsector_t = (int)blk_rq_pos(current_req) % max_sector; + if (_floppy->track && raw_cmd->cmd[TRACK] >= _floppy->track) { + if (blk_rq_cur_sectors(current_req) & 1) { + current_count_sectors = 1; + return 1; + } else + return 0; + } + raw_cmd->cmd[HEAD] = fsector_t / _floppy->sect; + + if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) || + test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) && + fsector_t < _floppy->sect) + max_sector = _floppy->sect; + + /* 2M disks have phantom sectors on the first track */ + if ((_floppy->rate & FD_2M) && (!raw_cmd->cmd[TRACK]) && (!raw_cmd->cmd[HEAD])) { + max_sector = 2 * _floppy->sect / 3; + if (fsector_t >= max_sector) { + current_count_sectors = + min_t(int, _floppy->sect - fsector_t, + blk_rq_sectors(current_req)); + return 1; + } + raw_cmd->cmd[SIZECODE] = 2; + } else + raw_cmd->cmd[SIZECODE] = FD_SIZECODE(_floppy); + raw_cmd->rate = _floppy->rate & 0x43; + if ((_floppy->rate & FD_2M) && + (raw_cmd->cmd[TRACK] || raw_cmd->cmd[HEAD]) && raw_cmd->rate == 2) + raw_cmd->rate = 1; + + if (raw_cmd->cmd[SIZECODE]) + raw_cmd->cmd[SIZECODE2] = 0xff; + else + raw_cmd->cmd[SIZECODE2] = 0x80; + raw_cmd->track = raw_cmd->cmd[TRACK] << STRETCH(_floppy); + raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, raw_cmd->cmd[HEAD]); + raw_cmd->cmd[GAP] = _floppy->gap; + ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4); + raw_cmd->cmd[SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[SIZECODE]; + raw_cmd->cmd[SECTOR] = ((fsector_t % _floppy->sect) << 2 >> raw_cmd->cmd[SIZECODE]) + + FD_SECTBASE(_floppy); + + /* tracksize describes the size which can be filled up with sectors + * of size ssize. + */ + tracksize = _floppy->sect - _floppy->sect % ssize; + if (tracksize < _floppy->sect) { + raw_cmd->cmd[SECT_PER_TRACK]++; + if (tracksize <= fsector_t % _floppy->sect) + raw_cmd->cmd[SECTOR]--; + + /* if we are beyond tracksize, fill up using smaller sectors */ + while (tracksize <= fsector_t % _floppy->sect) { + while (tracksize + ssize > _floppy->sect) { + raw_cmd->cmd[SIZECODE]--; + ssize >>= 1; + } + raw_cmd->cmd[SECTOR]++; + raw_cmd->cmd[SECT_PER_TRACK]++; + tracksize += ssize; + } + max_sector = raw_cmd->cmd[HEAD] * _floppy->sect + tracksize; + } else if (!raw_cmd->cmd[TRACK] && !raw_cmd->cmd[HEAD] && !(_floppy->rate & FD_2M) && probing) { + max_sector = _floppy->sect; + } else if (!raw_cmd->cmd[HEAD] && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { + /* for virtual DMA bug workaround */ + max_sector = _floppy->sect; + } + + in_sector_offset = (fsector_t % _floppy->sect) % ssize; + aligned_sector_t = fsector_t - in_sector_offset; + max_size = blk_rq_sectors(current_req); + if ((raw_cmd->track == buffer_track) && + (current_drive == buffer_drive) && + (fsector_t >= buffer_min) && (fsector_t < buffer_max)) { + /* data already in track buffer */ + if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) { + copy_buffer(1, max_sector, buffer_max); + return 1; + } + } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) { + if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { + unsigned int sectors; + + sectors = fsector_t + blk_rq_sectors(current_req); + if (sectors > ssize && sectors < ssize + ssize) + max_size = ssize + ssize; + else + max_size = ssize; + } + raw_cmd->flags &= ~FD_RAW_WRITE; + raw_cmd->flags |= FD_RAW_READ; + raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ); + } + + if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) + max_size = max_sector; /* unbounded */ + + /* claim buffer track if needed */ + if (buffer_track != raw_cmd->track || /* bad track */ + buffer_drive != current_drive || /* bad drive */ + fsector_t > buffer_max || + fsector_t < buffer_min || + ((CT(raw_cmd->cmd[COMMAND]) == FD_READ || + (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) && + max_sector > 2 * max_buffer_sectors + buffer_min && + max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) { + /* not enough space */ + buffer_track = -1; + buffer_drive = current_drive; + buffer_max = buffer_min = aligned_sector_t; + } + raw_cmd->kernel_data = floppy_track_buffer + + ((aligned_sector_t - buffer_min) << 9); + + if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { + /* copy write buffer to track buffer. + * if we get here, we know that the write + * is either aligned or the data already in the buffer + * (buffer will be overwritten) */ + if (in_sector_offset && buffer_track == -1) + DPRINT("internal error offset !=0 on write\n"); + buffer_track = raw_cmd->track; + buffer_drive = current_drive; + copy_buffer(ssize, max_sector, + 2 * max_buffer_sectors + buffer_min); + } else + transfer_size(ssize, max_sector, + 2 * max_buffer_sectors + buffer_min - + aligned_sector_t); + + /* round up current_count_sectors to get dma xfer size */ + raw_cmd->length = in_sector_offset + current_count_sectors; + raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1; + raw_cmd->length <<= 9; + if ((raw_cmd->length < current_count_sectors << 9) || + (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE && + (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max || + aligned_sector_t < buffer_min)) || + raw_cmd->length % (128 << raw_cmd->cmd[SIZECODE]) || + raw_cmd->length <= 0 || current_count_sectors <= 0) { + DPRINT("fractionary current count b=%lx s=%lx\n", + raw_cmd->length, current_count_sectors); + pr_info("addr=%d, length=%ld\n", + (int)((raw_cmd->kernel_data - + floppy_track_buffer) >> 9), + current_count_sectors); + pr_info("st=%d ast=%d mse=%d msi=%d\n", + fsector_t, aligned_sector_t, max_sector, max_size); + pr_info("ssize=%x SIZECODE=%d\n", ssize, raw_cmd->cmd[SIZECODE]); + pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n", + raw_cmd->cmd[COMMAND], raw_cmd->cmd[SECTOR], + raw_cmd->cmd[HEAD], raw_cmd->cmd[TRACK]); + pr_info("buffer drive=%d\n", buffer_drive); + pr_info("buffer track=%d\n", buffer_track); + pr_info("buffer_min=%d\n", buffer_min); + pr_info("buffer_max=%d\n", buffer_max); + return 0; + } + + if (raw_cmd->kernel_data < floppy_track_buffer || + current_count_sectors < 0 || + raw_cmd->length < 0 || + raw_cmd->kernel_data + raw_cmd->length > + floppy_track_buffer + (max_buffer_sectors << 10)) { + DPRINT("buffer overrun in schedule dma\n"); + pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n", + fsector_t, buffer_min, raw_cmd->length >> 9); + pr_info("current_count_sectors=%ld\n", + current_count_sectors); + if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) + pr_info("read\n"); + if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) + pr_info("write\n"); + return 0; + } + if (raw_cmd->length == 0) { + DPRINT("zero dma transfer attempted from make_raw_request\n"); + return 0; + } + + virtualdmabug_workaround(); + return 2; +} + +static int set_next_request(void) +{ + current_req = list_first_entry_or_null(&floppy_reqs, struct request, + queuelist); + if (current_req) { + floppy_errors = 0; + list_del_init(¤t_req->queuelist); + return 1; + } + return 0; +} + +/* Starts or continues processing request. Will automatically unlock the + * driver at end of request. + */ +static void redo_fd_request(void) +{ + int drive; + int tmp; + + lastredo = jiffies; + if (current_drive < N_DRIVE) + floppy_off(current_drive); + +do_request: + if (!current_req) { + int pending; + + spin_lock_irq(&floppy_lock); + pending = set_next_request(); + spin_unlock_irq(&floppy_lock); + if (!pending) { + do_floppy = NULL; + unlock_fdc(); + return; + } + } + drive = (long)current_req->q->disk->private_data; + set_fdc(drive); + reschedule_timeout(current_drive, "redo fd request"); + + set_floppy(drive); + raw_cmd = &default_raw_cmd; + raw_cmd->flags = 0; + if (start_motor(redo_fd_request)) + return; + + disk_change(current_drive); + if (test_bit(current_drive, &fake_change) || + test_bit(FD_DISK_CHANGED_BIT, &drive_state[current_drive].flags)) { + DPRINT("disk absent or changed during operation\n"); + request_done(0); + goto do_request; + } + if (!_floppy) { /* Autodetection */ + if (!probing) { + drive_state[current_drive].probed_format = 0; + if (next_valid_format(current_drive)) { + DPRINT("no autodetectable formats\n"); + _floppy = NULL; + request_done(0); + goto do_request; + } + } + probing = 1; + _floppy = floppy_type + drive_params[current_drive].autodetect[drive_state[current_drive].probed_format]; + } else + probing = 0; + tmp = make_raw_rw_request(); + if (tmp < 2) { + request_done(tmp); + goto do_request; + } + + if (test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) + twaddle(current_fdc, current_drive); + schedule_bh(floppy_start); + debugt(__func__, "queue fd request"); + return; +} + +static const struct cont_t rw_cont = { + .interrupt = rw_interrupt, + .redo = redo_fd_request, + .error = bad_flp_intr, + .done = request_done +}; + +/* schedule the request and automatically unlock the driver on completion */ +static void process_fd_request(void) +{ + cont = &rw_cont; + schedule_bh(redo_fd_request); +} + +static blk_status_t floppy_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + blk_mq_start_request(bd->rq); + + if (WARN(max_buffer_sectors == 0, + "VFS: %s called on non-open device\n", __func__)) + return BLK_STS_IOERR; + + if (WARN(atomic_read(&usage_count) == 0, + "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n", + current_req, (long)blk_rq_pos(current_req), + (__force unsigned long long) current_req->cmd_flags)) + return BLK_STS_IOERR; + + if (test_and_set_bit(0, &fdc_busy)) { + /* fdc busy, this new request will be treated when the + current one is done */ + is_alive(__func__, "old request running"); + return BLK_STS_RESOURCE; + } + + spin_lock_irq(&floppy_lock); + list_add_tail(&bd->rq->queuelist, &floppy_reqs); + spin_unlock_irq(&floppy_lock); + + command_status = FD_COMMAND_NONE; + __reschedule_timeout(MAXTIMEOUT, "fd_request"); + set_fdc(0); + process_fd_request(); + is_alive(__func__, ""); + return BLK_STS_OK; +} + +static const struct cont_t poll_cont = { + .interrupt = success_and_wakeup, + .redo = floppy_ready, + .error = generic_failure, + .done = generic_done +}; + +static int poll_drive(bool interruptible, int flag) +{ + /* no auto-sense, just clear dcl */ + raw_cmd = &default_raw_cmd; + raw_cmd->flags = flag; + raw_cmd->track = 0; + raw_cmd->cmd_count = 0; + cont = &poll_cont; + debug_dcl(drive_params[current_drive].flags, + "setting NEWCHANGE in poll_drive\n"); + set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags); + + return wait_til_done(floppy_ready, interruptible); +} + +/* + * User triggered reset + * ==================== + */ + +static void reset_intr(void) +{ + pr_info("weird, reset interrupt called\n"); +} + +static const struct cont_t reset_cont = { + .interrupt = reset_intr, + .redo = success_and_wakeup, + .error = generic_failure, + .done = generic_done +}; + +/* + * Resets the FDC connected to drive <drive>. + * Both current_drive and current_fdc are changed to match the new drive. + */ +static int user_reset_fdc(int drive, int arg, bool interruptible) +{ + int ret; + + if (lock_fdc(drive)) + return -EINTR; + + if (arg == FD_RESET_ALWAYS) + fdc_state[current_fdc].reset = 1; + if (fdc_state[current_fdc].reset) { + /* note: reset_fdc will take care of unlocking the driver + * on completion. + */ + cont = &reset_cont; + ret = wait_til_done(reset_fdc, interruptible); + if (ret == -EINTR) + return -EINTR; + } + process_fd_request(); + return 0; +} + +/* + * Misc Ioctl's and support + * ======================== + */ +static inline int fd_copyout(void __user *param, const void *address, + unsigned long size) +{ + return copy_to_user(param, address, size) ? -EFAULT : 0; +} + +static inline int fd_copyin(void __user *param, void *address, + unsigned long size) +{ + return copy_from_user(address, param, size) ? -EFAULT : 0; +} + +static const char *drive_name(int type, int drive) +{ + struct floppy_struct *floppy; + + if (type) + floppy = floppy_type + type; + else { + if (drive_params[drive].native_format) + floppy = floppy_type + drive_params[drive].native_format; + else + return "(null)"; + } + if (floppy->name) + return floppy->name; + else + return "(null)"; +} + +#ifdef CONFIG_BLK_DEV_FD_RAWCMD + +/* raw commands */ +static void raw_cmd_done(int flag) +{ + if (!flag) { + raw_cmd->flags |= FD_RAW_FAILURE; + raw_cmd->flags |= FD_RAW_HARDFAILURE; + } else { + raw_cmd->reply_count = inr; + if (raw_cmd->reply_count > FD_RAW_REPLY_SIZE) + raw_cmd->reply_count = 0; + memcpy(raw_cmd->reply, reply_buffer, raw_cmd->reply_count); + + if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) { + unsigned long flags; + flags = claim_dma_lock(); + raw_cmd->length = fd_get_dma_residue(); + release_dma_lock(flags); + } + + if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) && + (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0))) + raw_cmd->flags |= FD_RAW_FAILURE; + + if (disk_change(current_drive)) + raw_cmd->flags |= FD_RAW_DISK_CHANGE; + else + raw_cmd->flags &= ~FD_RAW_DISK_CHANGE; + if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER) + motor_off_callback(&motor_off_timer[current_drive]); + + if (raw_cmd->next && + (!(raw_cmd->flags & FD_RAW_FAILURE) || + !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) && + ((raw_cmd->flags & FD_RAW_FAILURE) || + !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) { + raw_cmd = raw_cmd->next; + return; + } + } + generic_done(flag); +} + +static const struct cont_t raw_cmd_cont = { + .interrupt = success_and_wakeup, + .redo = floppy_start, + .error = generic_failure, + .done = raw_cmd_done +}; + +static int raw_cmd_copyout(int cmd, void __user *param, + struct floppy_raw_cmd *ptr) +{ + int ret; + + while (ptr) { + struct floppy_raw_cmd cmd = *ptr; + cmd.next = NULL; + cmd.kernel_data = NULL; + ret = copy_to_user(param, &cmd, sizeof(cmd)); + if (ret) + return -EFAULT; + param += sizeof(struct floppy_raw_cmd); + if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) { + if (ptr->length >= 0 && + ptr->length <= ptr->buffer_length) { + long length = ptr->buffer_length - ptr->length; + ret = fd_copyout(ptr->data, ptr->kernel_data, + length); + if (ret) + return ret; + } + } + ptr = ptr->next; + } + + return 0; +} + +static void raw_cmd_free(struct floppy_raw_cmd **ptr) +{ + struct floppy_raw_cmd *next; + struct floppy_raw_cmd *this; + + this = *ptr; + *ptr = NULL; + while (this) { + if (this->buffer_length) { + fd_dma_mem_free((unsigned long)this->kernel_data, + this->buffer_length); + this->buffer_length = 0; + } + next = this->next; + kfree(this); + this = next; + } +} + +#define MAX_LEN (1UL << MAX_ORDER << PAGE_SHIFT) + +static int raw_cmd_copyin(int cmd, void __user *param, + struct floppy_raw_cmd **rcmd) +{ + struct floppy_raw_cmd *ptr; + int ret; + + *rcmd = NULL; + +loop: + ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + *rcmd = ptr; + ret = copy_from_user(ptr, param, sizeof(*ptr)); + ptr->next = NULL; + ptr->buffer_length = 0; + ptr->kernel_data = NULL; + if (ret) + return -EFAULT; + param += sizeof(struct floppy_raw_cmd); + if (ptr->cmd_count > FD_RAW_CMD_FULLSIZE) + return -EINVAL; + + memset(ptr->reply, 0, FD_RAW_REPLY_SIZE); + ptr->resultcode = 0; + + if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) { + if (ptr->length <= 0 || ptr->length >= MAX_LEN) + return -EINVAL; + ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length); + fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length); + if (!ptr->kernel_data) + return -ENOMEM; + ptr->buffer_length = ptr->length; + } + if (ptr->flags & FD_RAW_WRITE) { + ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length); + if (ret) + return ret; + } + + if (ptr->flags & FD_RAW_MORE) { + rcmd = &(ptr->next); + ptr->rate &= 0x43; + goto loop; + } + + return 0; +} + +static int raw_cmd_ioctl(int cmd, void __user *param) +{ + struct floppy_raw_cmd *my_raw_cmd; + int drive; + int ret2; + int ret; + + if (fdc_state[current_fdc].rawcmd <= 1) + fdc_state[current_fdc].rawcmd = 1; + for (drive = 0; drive < N_DRIVE; drive++) { + if (FDC(drive) != current_fdc) + continue; + if (drive == current_drive) { + if (drive_state[drive].fd_ref > 1) { + fdc_state[current_fdc].rawcmd = 2; + break; + } + } else if (drive_state[drive].fd_ref) { + fdc_state[current_fdc].rawcmd = 2; + break; + } + } + + if (fdc_state[current_fdc].reset) + return -EIO; + + ret = raw_cmd_copyin(cmd, param, &my_raw_cmd); + if (ret) { + raw_cmd_free(&my_raw_cmd); + return ret; + } + + raw_cmd = my_raw_cmd; + cont = &raw_cmd_cont; + ret = wait_til_done(floppy_start, true); + debug_dcl(drive_params[current_drive].flags, + "calling disk change from raw_cmd ioctl\n"); + + if (ret != -EINTR && fdc_state[current_fdc].reset) + ret = -EIO; + + drive_state[current_drive].track = NO_TRACK; + + ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd); + if (!ret) + ret = ret2; + raw_cmd_free(&my_raw_cmd); + return ret; +} + +static int floppy_raw_cmd_ioctl(int type, int drive, int cmd, + void __user *param) +{ + int ret; + + pr_warn_once("Note: FDRAWCMD is deprecated and will be removed from the kernel in the near future.\n"); + + if (type) + return -EINVAL; + if (lock_fdc(drive)) + return -EINTR; + set_floppy(drive); + ret = raw_cmd_ioctl(cmd, param); + if (ret == -EINTR) + return -EINTR; + process_fd_request(); + return ret; +} + +#else /* CONFIG_BLK_DEV_FD_RAWCMD */ + +static int floppy_raw_cmd_ioctl(int type, int drive, int cmd, + void __user *param) +{ + return -EOPNOTSUPP; +} + +#endif + +static int invalidate_drive(struct block_device *bdev) +{ + /* invalidate the buffer track to force a reread */ + set_bit((long)bdev->bd_disk->private_data, &fake_change); + process_fd_request(); + if (bdev_check_media_change(bdev)) + floppy_revalidate(bdev->bd_disk); + return 0; +} + +static int set_geometry(unsigned int cmd, struct floppy_struct *g, + int drive, int type, struct block_device *bdev) +{ + int cnt; + + /* sanity checking for parameters. */ + if ((int)g->sect <= 0 || + (int)g->head <= 0 || + /* check for overflow in max_sector */ + (int)(g->sect * g->head) <= 0 || + /* check for zero in raw_cmd->cmd[F_SECT_PER_TRACK] */ + (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 || + g->track <= 0 || g->track > drive_params[drive].tracks >> STRETCH(g) || + /* check if reserved bits are set */ + (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0) + return -EINVAL; + if (type) { + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + mutex_lock(&open_lock); + if (lock_fdc(drive)) { + mutex_unlock(&open_lock); + return -EINTR; + } + floppy_type[type] = *g; + floppy_type[type].name = "user format"; + for (cnt = type << 2; cnt < (type << 2) + 4; cnt++) + floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] = + floppy_type[type].size + 1; + process_fd_request(); + for (cnt = 0; cnt < N_DRIVE; cnt++) { + struct block_device *bdev = opened_bdev[cnt]; + if (!bdev || ITYPE(drive_state[cnt].fd_device) != type) + continue; + __invalidate_device(bdev, true); + } + mutex_unlock(&open_lock); + } else { + int oldStretch; + + if (lock_fdc(drive)) + return -EINTR; + if (cmd != FDDEFPRM) { + /* notice a disk change immediately, else + * we lose our settings immediately*/ + if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) + return -EINTR; + } + oldStretch = g->stretch; + user_params[drive] = *g; + if (buffer_drive == drive) + SUPBOUND(buffer_max, user_params[drive].sect); + current_type[drive] = &user_params[drive]; + floppy_sizes[drive] = user_params[drive].size; + if (cmd == FDDEFPRM) + drive_state[current_drive].keep_data = -1; + else + drive_state[current_drive].keep_data = 1; + /* invalidation. Invalidate only when needed, i.e. + * when there are already sectors in the buffer cache + * whose number will change. This is useful, because + * mtools often changes the geometry of the disk after + * looking at the boot block */ + if (drive_state[current_drive].maxblock > user_params[drive].sect || + drive_state[current_drive].maxtrack || + ((user_params[drive].sect ^ oldStretch) & + (FD_SWAPSIDES | FD_SECTBASEMASK))) + invalidate_drive(bdev); + else + process_fd_request(); + } + return 0; +} + +/* handle obsolete ioctl's */ +static unsigned int ioctl_table[] = { + FDCLRPRM, + FDSETPRM, + FDDEFPRM, + FDGETPRM, + FDMSGON, + FDMSGOFF, + FDFMTBEG, + FDFMTTRK, + FDFMTEND, + FDSETEMSGTRESH, + FDFLUSH, + FDSETMAXERRS, + FDGETMAXERRS, + FDGETDRVTYP, + FDSETDRVPRM, + FDGETDRVPRM, + FDGETDRVSTAT, + FDPOLLDRVSTAT, + FDRESET, + FDGETFDCSTAT, + FDWERRORCLR, + FDWERRORGET, + FDRAWCMD, + FDEJECT, + FDTWADDLE +}; + +static int normalize_ioctl(unsigned int *cmd, int *size) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) { + if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) { + *size = _IOC_SIZE(*cmd); + *cmd = ioctl_table[i]; + if (*size > _IOC_SIZE(*cmd)) { + pr_info("ioctl not yet supported\n"); + return -EFAULT; + } + return 0; + } + } + return -EINVAL; +} + +static int get_floppy_geometry(int drive, int type, struct floppy_struct **g) +{ + if (type) + *g = &floppy_type[type]; + else { + if (lock_fdc(drive)) + return -EINTR; + if (poll_drive(false, 0) == -EINTR) + return -EINTR; + process_fd_request(); + *g = current_type[drive]; + } + if (!*g) + return -ENODEV; + return 0; +} + +static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + int drive = (long)bdev->bd_disk->private_data; + int type = ITYPE(drive_state[drive].fd_device); + struct floppy_struct *g; + int ret; + + ret = get_floppy_geometry(drive, type, &g); + if (ret) + return ret; + + geo->heads = g->head; + geo->sectors = g->sect; + geo->cylinders = g->track; + return 0; +} + +static bool valid_floppy_drive_params(const short autodetect[FD_AUTODETECT_SIZE], + int native_format) +{ + size_t floppy_type_size = ARRAY_SIZE(floppy_type); + size_t i = 0; + + for (i = 0; i < FD_AUTODETECT_SIZE; ++i) { + if (autodetect[i] < 0 || + autodetect[i] >= floppy_type_size) + return false; + } + + if (native_format < 0 || native_format >= floppy_type_size) + return false; + + return true; +} + +static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, + unsigned long param) +{ + int drive = (long)bdev->bd_disk->private_data; + int type = ITYPE(drive_state[drive].fd_device); + int ret; + int size; + union inparam { + struct floppy_struct g; /* geometry */ + struct format_descr f; + struct floppy_max_errors max_errors; + struct floppy_drive_params dp; + } inparam; /* parameters coming from user space */ + const void *outparam; /* parameters passed back to user space */ + + /* convert compatibility eject ioctls into floppy eject ioctl. + * We do this in order to provide a means to eject floppy disks before + * installing the new fdutils package */ + if (cmd == CDROMEJECT || /* CD-ROM eject */ + cmd == 0x6470) { /* SunOS floppy eject */ + DPRINT("obsolete eject ioctl\n"); + DPRINT("please use floppycontrol --eject\n"); + cmd = FDEJECT; + } + + if (!((cmd & 0xff00) == 0x0200)) + return -EINVAL; + + /* convert the old style command into a new style command */ + ret = normalize_ioctl(&cmd, &size); + if (ret) + return ret; + + /* permission checks */ + if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) || + ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))) + return -EPERM; + + if (WARN_ON(size < 0 || size > sizeof(inparam))) + return -EINVAL; + + /* copyin */ + memset(&inparam, 0, sizeof(inparam)); + if (_IOC_DIR(cmd) & _IOC_WRITE) { + ret = fd_copyin((void __user *)param, &inparam, size); + if (ret) + return ret; + } + + switch (cmd) { + case FDEJECT: + if (drive_state[drive].fd_ref != 1) + /* somebody else has this drive open */ + return -EBUSY; + if (lock_fdc(drive)) + return -EINTR; + + /* do the actual eject. Fails on + * non-Sparc architectures */ + ret = fd_eject(UNIT(drive)); + + set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); + set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); + process_fd_request(); + return ret; + case FDCLRPRM: + if (lock_fdc(drive)) + return -EINTR; + current_type[drive] = NULL; + floppy_sizes[drive] = MAX_DISK_SIZE << 1; + drive_state[drive].keep_data = 0; + return invalidate_drive(bdev); + case FDSETPRM: + case FDDEFPRM: + return set_geometry(cmd, &inparam.g, drive, type, bdev); + case FDGETPRM: + ret = get_floppy_geometry(drive, type, + (struct floppy_struct **)&outparam); + if (ret) + return ret; + memcpy(&inparam.g, outparam, + offsetof(struct floppy_struct, name)); + outparam = &inparam.g; + break; + case FDMSGON: + drive_params[drive].flags |= FTD_MSG; + return 0; + case FDMSGOFF: + drive_params[drive].flags &= ~FTD_MSG; + return 0; + case FDFMTBEG: + if (lock_fdc(drive)) + return -EINTR; + if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) + return -EINTR; + ret = drive_state[drive].flags; + process_fd_request(); + if (ret & FD_VERIFY) + return -ENODEV; + if (!(ret & FD_DISK_WRITABLE)) + return -EROFS; + return 0; + case FDFMTTRK: + if (drive_state[drive].fd_ref != 1) + return -EBUSY; + return do_format(drive, &inparam.f); + case FDFMTEND: + case FDFLUSH: + if (lock_fdc(drive)) + return -EINTR; + return invalidate_drive(bdev); + case FDSETEMSGTRESH: + drive_params[drive].max_errors.reporting = (unsigned short)(param & 0x0f); + return 0; + case FDGETMAXERRS: + outparam = &drive_params[drive].max_errors; + break; + case FDSETMAXERRS: + drive_params[drive].max_errors = inparam.max_errors; + break; + case FDGETDRVTYP: + outparam = drive_name(type, drive); + SUPBOUND(size, strlen((const char *)outparam) + 1); + break; + case FDSETDRVPRM: + if (!valid_floppy_drive_params(inparam.dp.autodetect, + inparam.dp.native_format)) + return -EINVAL; + drive_params[drive] = inparam.dp; + break; + case FDGETDRVPRM: + outparam = &drive_params[drive]; + break; + case FDPOLLDRVSTAT: + if (lock_fdc(drive)) + return -EINTR; + if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) + return -EINTR; + process_fd_request(); + fallthrough; + case FDGETDRVSTAT: + outparam = &drive_state[drive]; + break; + case FDRESET: + return user_reset_fdc(drive, (int)param, true); + case FDGETFDCSTAT: + outparam = &fdc_state[FDC(drive)]; + break; + case FDWERRORCLR: + memset(&write_errors[drive], 0, sizeof(write_errors[drive])); + return 0; + case FDWERRORGET: + outparam = &write_errors[drive]; + break; + case FDRAWCMD: + return floppy_raw_cmd_ioctl(type, drive, cmd, (void __user *)param); + case FDTWADDLE: + if (lock_fdc(drive)) + return -EINTR; + twaddle(current_fdc, current_drive); + process_fd_request(); + return 0; + default: + return -EINVAL; + } + + if (_IOC_DIR(cmd) & _IOC_READ) + return fd_copyout((void __user *)param, outparam, size); + + return 0; +} + +static int fd_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long param) +{ + int ret; + + mutex_lock(&floppy_mutex); + ret = fd_locked_ioctl(bdev, mode, cmd, param); + mutex_unlock(&floppy_mutex); + + return ret; +} + +#ifdef CONFIG_COMPAT + +struct compat_floppy_drive_params { + char cmos; + compat_ulong_t max_dtr; + compat_ulong_t hlt; + compat_ulong_t hut; + compat_ulong_t srt; + compat_ulong_t spinup; + compat_ulong_t spindown; + unsigned char spindown_offset; + unsigned char select_delay; + unsigned char rps; + unsigned char tracks; + compat_ulong_t timeout; + unsigned char interleave_sect; + struct floppy_max_errors max_errors; + char flags; + char read_track; + short autodetect[FD_AUTODETECT_SIZE]; + compat_int_t checkfreq; + compat_int_t native_format; +}; + +struct compat_floppy_drive_struct { + signed char flags; + compat_ulong_t spinup_date; + compat_ulong_t select_date; + compat_ulong_t first_read_date; + short probed_format; + short track; + short maxblock; + short maxtrack; + compat_int_t generation; + compat_int_t keep_data; + compat_int_t fd_ref; + compat_int_t fd_device; + compat_int_t last_checked; + compat_caddr_t dmabuf; + compat_int_t bufblocks; +}; + +struct compat_floppy_fdc_state { + compat_int_t spec1; + compat_int_t spec2; + compat_int_t dtr; + unsigned char version; + unsigned char dor; + compat_ulong_t address; + unsigned int rawcmd:2; + unsigned int reset:1; + unsigned int need_configure:1; + unsigned int perp_mode:2; + unsigned int has_fifo:1; + unsigned int driver_version; + unsigned char track[4]; +}; + +struct compat_floppy_write_errors { + unsigned int write_errors; + compat_ulong_t first_error_sector; + compat_int_t first_error_generation; + compat_ulong_t last_error_sector; + compat_int_t last_error_generation; + compat_uint_t badness; +}; + +#define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct) +#define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct) +#define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params) +#define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params) +#define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct) +#define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct) +#define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state) +#define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors) + +static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd, + struct compat_floppy_struct __user *arg) +{ + struct floppy_struct v; + int drive, type; + int err; + + BUILD_BUG_ON(offsetof(struct floppy_struct, name) != + offsetof(struct compat_floppy_struct, name)); + + if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) + return -EPERM; + + memset(&v, 0, sizeof(struct floppy_struct)); + if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name))) + return -EFAULT; + + mutex_lock(&floppy_mutex); + drive = (long)bdev->bd_disk->private_data; + type = ITYPE(drive_state[drive].fd_device); + err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM, + &v, drive, type, bdev); + mutex_unlock(&floppy_mutex); + return err; +} + +static int compat_get_prm(int drive, + struct compat_floppy_struct __user *arg) +{ + struct compat_floppy_struct v; + struct floppy_struct *p; + int err; + + memset(&v, 0, sizeof(v)); + mutex_lock(&floppy_mutex); + err = get_floppy_geometry(drive, ITYPE(drive_state[drive].fd_device), + &p); + if (err) { + mutex_unlock(&floppy_mutex); + return err; + } + memcpy(&v, p, offsetof(struct floppy_struct, name)); + mutex_unlock(&floppy_mutex); + if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct))) + return -EFAULT; + return 0; +} + +static int compat_setdrvprm(int drive, + struct compat_floppy_drive_params __user *arg) +{ + struct compat_floppy_drive_params v; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params))) + return -EFAULT; + if (!valid_floppy_drive_params(v.autodetect, v.native_format)) + return -EINVAL; + mutex_lock(&floppy_mutex); + drive_params[drive].cmos = v.cmos; + drive_params[drive].max_dtr = v.max_dtr; + drive_params[drive].hlt = v.hlt; + drive_params[drive].hut = v.hut; + drive_params[drive].srt = v.srt; + drive_params[drive].spinup = v.spinup; + drive_params[drive].spindown = v.spindown; + drive_params[drive].spindown_offset = v.spindown_offset; + drive_params[drive].select_delay = v.select_delay; + drive_params[drive].rps = v.rps; + drive_params[drive].tracks = v.tracks; + drive_params[drive].timeout = v.timeout; + drive_params[drive].interleave_sect = v.interleave_sect; + drive_params[drive].max_errors = v.max_errors; + drive_params[drive].flags = v.flags; + drive_params[drive].read_track = v.read_track; + memcpy(drive_params[drive].autodetect, v.autodetect, + sizeof(v.autodetect)); + drive_params[drive].checkfreq = v.checkfreq; + drive_params[drive].native_format = v.native_format; + mutex_unlock(&floppy_mutex); + return 0; +} + +static int compat_getdrvprm(int drive, + struct compat_floppy_drive_params __user *arg) +{ + struct compat_floppy_drive_params v; + + memset(&v, 0, sizeof(struct compat_floppy_drive_params)); + mutex_lock(&floppy_mutex); + v.cmos = drive_params[drive].cmos; + v.max_dtr = drive_params[drive].max_dtr; + v.hlt = drive_params[drive].hlt; + v.hut = drive_params[drive].hut; + v.srt = drive_params[drive].srt; + v.spinup = drive_params[drive].spinup; + v.spindown = drive_params[drive].spindown; + v.spindown_offset = drive_params[drive].spindown_offset; + v.select_delay = drive_params[drive].select_delay; + v.rps = drive_params[drive].rps; + v.tracks = drive_params[drive].tracks; + v.timeout = drive_params[drive].timeout; + v.interleave_sect = drive_params[drive].interleave_sect; + v.max_errors = drive_params[drive].max_errors; + v.flags = drive_params[drive].flags; + v.read_track = drive_params[drive].read_track; + memcpy(v.autodetect, drive_params[drive].autodetect, + sizeof(v.autodetect)); + v.checkfreq = drive_params[drive].checkfreq; + v.native_format = drive_params[drive].native_format; + mutex_unlock(&floppy_mutex); + + if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params))) + return -EFAULT; + return 0; +} + +static int compat_getdrvstat(int drive, bool poll, + struct compat_floppy_drive_struct __user *arg) +{ + struct compat_floppy_drive_struct v; + + memset(&v, 0, sizeof(struct compat_floppy_drive_struct)); + mutex_lock(&floppy_mutex); + + if (poll) { + if (lock_fdc(drive)) + goto Eintr; + if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) + goto Eintr; + process_fd_request(); + } + v.spinup_date = drive_state[drive].spinup_date; + v.select_date = drive_state[drive].select_date; + v.first_read_date = drive_state[drive].first_read_date; + v.probed_format = drive_state[drive].probed_format; + v.track = drive_state[drive].track; + v.maxblock = drive_state[drive].maxblock; + v.maxtrack = drive_state[drive].maxtrack; + v.generation = drive_state[drive].generation; + v.keep_data = drive_state[drive].keep_data; + v.fd_ref = drive_state[drive].fd_ref; + v.fd_device = drive_state[drive].fd_device; + v.last_checked = drive_state[drive].last_checked; + v.dmabuf = (uintptr_t) drive_state[drive].dmabuf; + v.bufblocks = drive_state[drive].bufblocks; + mutex_unlock(&floppy_mutex); + + if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct))) + return -EFAULT; + return 0; +Eintr: + mutex_unlock(&floppy_mutex); + return -EINTR; +} + +static int compat_getfdcstat(int drive, + struct compat_floppy_fdc_state __user *arg) +{ + struct compat_floppy_fdc_state v32; + struct floppy_fdc_state v; + + mutex_lock(&floppy_mutex); + v = fdc_state[FDC(drive)]; + mutex_unlock(&floppy_mutex); + + memset(&v32, 0, sizeof(struct compat_floppy_fdc_state)); + v32.spec1 = v.spec1; + v32.spec2 = v.spec2; + v32.dtr = v.dtr; + v32.version = v.version; + v32.dor = v.dor; + v32.address = v.address; + v32.rawcmd = v.rawcmd; + v32.reset = v.reset; + v32.need_configure = v.need_configure; + v32.perp_mode = v.perp_mode; + v32.has_fifo = v.has_fifo; + v32.driver_version = v.driver_version; + memcpy(v32.track, v.track, 4); + if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state))) + return -EFAULT; + return 0; +} + +static int compat_werrorget(int drive, + struct compat_floppy_write_errors __user *arg) +{ + struct compat_floppy_write_errors v32; + struct floppy_write_errors v; + + memset(&v32, 0, sizeof(struct compat_floppy_write_errors)); + mutex_lock(&floppy_mutex); + v = write_errors[drive]; + mutex_unlock(&floppy_mutex); + v32.write_errors = v.write_errors; + v32.first_error_sector = v.first_error_sector; + v32.first_error_generation = v.first_error_generation; + v32.last_error_sector = v.last_error_sector; + v32.last_error_generation = v.last_error_generation; + v32.badness = v.badness; + if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors))) + return -EFAULT; + return 0; +} + +static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, + unsigned long param) +{ + int drive = (long)bdev->bd_disk->private_data; + switch (cmd) { + case CDROMEJECT: /* CD-ROM eject */ + case 0x6470: /* SunOS floppy eject */ + + case FDMSGON: + case FDMSGOFF: + case FDSETEMSGTRESH: + case FDFLUSH: + case FDWERRORCLR: + case FDEJECT: + case FDCLRPRM: + case FDFMTBEG: + case FDRESET: + case FDTWADDLE: + return fd_ioctl(bdev, mode, cmd, param); + case FDSETMAXERRS: + case FDGETMAXERRS: + case FDGETDRVTYP: + case FDFMTEND: + case FDFMTTRK: + case FDRAWCMD: + return fd_ioctl(bdev, mode, cmd, + (unsigned long)compat_ptr(param)); + case FDSETPRM32: + case FDDEFPRM32: + return compat_set_geometry(bdev, mode, cmd, compat_ptr(param)); + case FDGETPRM32: + return compat_get_prm(drive, compat_ptr(param)); + case FDSETDRVPRM32: + return compat_setdrvprm(drive, compat_ptr(param)); + case FDGETDRVPRM32: + return compat_getdrvprm(drive, compat_ptr(param)); + case FDPOLLDRVSTAT32: + return compat_getdrvstat(drive, true, compat_ptr(param)); + case FDGETDRVSTAT32: + return compat_getdrvstat(drive, false, compat_ptr(param)); + case FDGETFDCSTAT32: + return compat_getfdcstat(drive, compat_ptr(param)); + case FDWERRORGET32: + return compat_werrorget(drive, compat_ptr(param)); + } + return -EINVAL; +} +#endif + +static void __init config_types(void) +{ + bool has_drive = false; + int drive; + + /* read drive info out of physical CMOS */ + drive = 0; + if (!drive_params[drive].cmos) + drive_params[drive].cmos = FLOPPY0_TYPE; + drive = 1; + if (!drive_params[drive].cmos) + drive_params[drive].cmos = FLOPPY1_TYPE; + + /* FIXME: additional physical CMOS drive detection should go here */ + + for (drive = 0; drive < N_DRIVE; drive++) { + unsigned int type = drive_params[drive].cmos; + struct floppy_drive_params *params; + const char *name = NULL; + char temparea[32]; + + if (type < ARRAY_SIZE(default_drive_params)) { + params = &default_drive_params[type].params; + if (type) { + name = default_drive_params[type].name; + allowed_drive_mask |= 1 << drive; + } else + allowed_drive_mask &= ~(1 << drive); + } else { + params = &default_drive_params[0].params; + snprintf(temparea, sizeof(temparea), + "unknown type %d (usb?)", type); + name = temparea; + } + if (name) { + const char *prepend; + if (!has_drive) { + prepend = ""; + has_drive = true; + pr_info("Floppy drive(s):"); + } else { + prepend = ","; + } + + pr_cont("%s fd%d is %s", prepend, drive, name); + } + drive_params[drive] = *params; + } + + if (has_drive) + pr_cont("\n"); +} + +static void floppy_release(struct gendisk *disk, fmode_t mode) +{ + int drive = (long)disk->private_data; + + mutex_lock(&floppy_mutex); + mutex_lock(&open_lock); + if (!drive_state[drive].fd_ref--) { + DPRINT("floppy_release with fd_ref == 0"); + drive_state[drive].fd_ref = 0; + } + if (!drive_state[drive].fd_ref) + opened_bdev[drive] = NULL; + mutex_unlock(&open_lock); + mutex_unlock(&floppy_mutex); +} + +/* + * 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 block_device *bdev, fmode_t mode) +{ + int drive = (long)bdev->bd_disk->private_data; + int old_dev, new_dev; + int try; + int res = -EBUSY; + char *tmp; + + mutex_lock(&floppy_mutex); + mutex_lock(&open_lock); + old_dev = drive_state[drive].fd_device; + if (opened_bdev[drive] && opened_bdev[drive] != bdev) + goto out2; + + if (!drive_state[drive].fd_ref && (drive_params[drive].flags & FD_BROKEN_DCL)) { + set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); + set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); + } + + drive_state[drive].fd_ref++; + + opened_bdev[drive] = bdev; + + res = -ENXIO; + + if (!floppy_track_buffer) { + /* if opening an ED drive, reserve a big buffer, + * else reserve a small one */ + if ((drive_params[drive].cmos == 6) || (drive_params[drive].cmos == 5)) + try = 64; /* Only 48 actually useful */ + else + try = 32; /* Only 24 actually useful */ + + tmp = (char *)fd_dma_mem_alloc(1024 * try); + if (!tmp && !floppy_track_buffer) { + try >>= 1; /* buffer only one side */ + INFBOUND(try, 16); + tmp = (char *)fd_dma_mem_alloc(1024 * try); + } + if (!tmp && !floppy_track_buffer) + fallback_on_nodma_alloc(&tmp, 2048 * try); + if (!tmp && !floppy_track_buffer) { + DPRINT("Unable to allocate DMA memory\n"); + goto out; + } + if (floppy_track_buffer) { + if (tmp) + fd_dma_mem_free((unsigned long)tmp, try * 1024); + } else { + buffer_min = buffer_max = -1; + floppy_track_buffer = tmp; + max_buffer_sectors = try; + } + } + + new_dev = MINOR(bdev->bd_dev); + drive_state[drive].fd_device = new_dev; + set_capacity(disks[drive][ITYPE(new_dev)], floppy_sizes[new_dev]); + if (old_dev != -1 && old_dev != new_dev) { + if (buffer_drive == drive) + buffer_track = -1; + } + + if (fdc_state[FDC(drive)].rawcmd == 1) + fdc_state[FDC(drive)].rawcmd = 2; + + if (!(mode & FMODE_NDELAY)) { + if (mode & (FMODE_READ|FMODE_WRITE)) { + drive_state[drive].last_checked = 0; + clear_bit(FD_OPEN_SHOULD_FAIL_BIT, + &drive_state[drive].flags); + if (bdev_check_media_change(bdev)) + floppy_revalidate(bdev->bd_disk); + if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags)) + goto out; + if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags)) + goto out; + } + res = -EROFS; + if ((mode & FMODE_WRITE) && + !test_bit(FD_DISK_WRITABLE_BIT, &drive_state[drive].flags)) + goto out; + } + mutex_unlock(&open_lock); + mutex_unlock(&floppy_mutex); + return 0; +out: + drive_state[drive].fd_ref--; + + if (!drive_state[drive].fd_ref) + opened_bdev[drive] = NULL; +out2: + mutex_unlock(&open_lock); + mutex_unlock(&floppy_mutex); + return res; +} + +/* + * Check if the disk has been changed or if a change has been faked. + */ +static unsigned int floppy_check_events(struct gendisk *disk, + unsigned int clearing) +{ + int drive = (long)disk->private_data; + + if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || + test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) + return DISK_EVENT_MEDIA_CHANGE; + + if (time_after(jiffies, drive_state[drive].last_checked + drive_params[drive].checkfreq)) { + if (lock_fdc(drive)) + return 0; + poll_drive(false, 0); + process_fd_request(); + } + + if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || + test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) || + test_bit(drive, &fake_change) || + drive_no_geom(drive)) + return DISK_EVENT_MEDIA_CHANGE; + return 0; +} + +/* + * This implements "read block 0" for floppy_revalidate(). + * Needed for format autodetection, checking whether there is + * a disk in the drive, and whether that disk is writable. + */ + +struct rb0_cbdata { + int drive; + struct completion complete; +}; + +static void floppy_rb0_cb(struct bio *bio) +{ + struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private; + int drive = cbdata->drive; + + if (bio->bi_status) { + pr_info("floppy: error %d while reading block 0\n", + bio->bi_status); + set_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags); + } + complete(&cbdata->complete); +} + +static int __floppy_read_block_0(struct block_device *bdev, int drive) +{ + struct bio bio; + struct bio_vec bio_vec; + struct page *page; + struct rb0_cbdata cbdata; + + page = alloc_page(GFP_NOIO); + if (!page) { + process_fd_request(); + return -ENOMEM; + } + + cbdata.drive = drive; + + bio_init(&bio, bdev, &bio_vec, 1, REQ_OP_READ); + bio_add_page(&bio, page, block_size(bdev), 0); + + bio.bi_iter.bi_sector = 0; + bio.bi_flags |= (1 << BIO_QUIET); + bio.bi_private = &cbdata; + bio.bi_end_io = floppy_rb0_cb; + + init_completion(&cbdata.complete); + + submit_bio(&bio); + process_fd_request(); + + wait_for_completion(&cbdata.complete); + + __free_page(page); + + return 0; +} + +/* revalidate the floppy disk, i.e. trigger format autodetection by reading + * the bootblock (block 0). "Autodetection" is also needed to check whether + * there is a disk in the drive at all... Thus we also do it for fixed + * geometry formats */ +static int floppy_revalidate(struct gendisk *disk) +{ + int drive = (long)disk->private_data; + int cf; + int res = 0; + + if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || + test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) || + test_bit(drive, &fake_change) || + drive_no_geom(drive)) { + if (WARN(atomic_read(&usage_count) == 0, + "VFS: revalidate called on non-open device.\n")) + return -EFAULT; + + res = lock_fdc(drive); + if (res) + return res; + cf = (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || + test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)); + if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) { + process_fd_request(); /*already done by another thread */ + return 0; + } + drive_state[drive].maxblock = 0; + drive_state[drive].maxtrack = 0; + if (buffer_drive == drive) + buffer_track = -1; + clear_bit(drive, &fake_change); + clear_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); + if (cf) + drive_state[drive].generation++; + if (drive_no_geom(drive)) { + /* auto-sensing */ + res = __floppy_read_block_0(opened_bdev[drive], drive); + } else { + if (cf) + poll_drive(false, FD_RAW_NEED_DISK); + process_fd_request(); + } + } + set_capacity(disk, floppy_sizes[drive_state[drive].fd_device]); + return res; +} + +static const struct block_device_operations floppy_fops = { + .owner = THIS_MODULE, + .open = floppy_open, + .release = floppy_release, + .ioctl = fd_ioctl, + .getgeo = fd_getgeo, + .check_events = floppy_check_events, +#ifdef CONFIG_COMPAT + .compat_ioctl = fd_compat_ioctl, +#endif +}; + +/* + * Floppy Driver initialization + * ============================= + */ + +/* Determine the floppy disk controller type */ +/* This routine was written by David C. Niemi */ +static char __init get_fdc_version(int fdc) +{ + int r; + + output_byte(fdc, FD_DUMPREGS); /* 82072 and better know DUMPREGS */ + if (fdc_state[fdc].reset) + return FDC_NONE; + r = result(fdc); + if (r <= 0x00) + return FDC_NONE; /* No FDC present ??? */ + if ((r == 1) && (reply_buffer[ST0] == 0x80)) { + pr_info("FDC %d is an 8272A\n", fdc); + return FDC_8272A; /* 8272a/765 don't know DUMPREGS */ + } + if (r != 10) { + pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n", + fdc, r); + return FDC_UNKNOWN; + } + + if (!fdc_configure(fdc)) { + pr_info("FDC %d is an 82072\n", fdc); + return FDC_82072; /* 82072 doesn't know CONFIGURE */ + } + + output_byte(fdc, FD_PERPENDICULAR); + if (need_more_output(fdc) == MORE_OUTPUT) { + output_byte(fdc, 0); + } else { + pr_info("FDC %d is an 82072A\n", fdc); + return FDC_82072A; /* 82072A as found on Sparcs. */ + } + + output_byte(fdc, FD_UNLOCK); + r = result(fdc); + if ((r == 1) && (reply_buffer[ST0] == 0x80)) { + pr_info("FDC %d is a pre-1991 82077\n", fdc); + return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know + * LOCK/UNLOCK */ + } + if ((r != 1) || (reply_buffer[ST0] != 0x00)) { + pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n", + fdc, r); + return FDC_UNKNOWN; + } + output_byte(fdc, FD_PARTID); + r = result(fdc); + if (r != 1) { + pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n", + fdc, r); + return FDC_UNKNOWN; + } + if (reply_buffer[ST0] == 0x80) { + pr_info("FDC %d is a post-1991 82077\n", fdc); + return FDC_82077; /* Revised 82077AA passes all the tests */ + } + switch (reply_buffer[ST0] >> 5) { + case 0x0: + /* Either a 82078-1 or a 82078SL running at 5Volt */ + pr_info("FDC %d is an 82078.\n", fdc); + return FDC_82078; + case 0x1: + pr_info("FDC %d is a 44pin 82078\n", fdc); + return FDC_82078; + case 0x2: + pr_info("FDC %d is a S82078B\n", fdc); + return FDC_S82078B; + case 0x3: + pr_info("FDC %d is a National Semiconductor PC87306\n", fdc); + return FDC_87306; + default: + pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n", + fdc, reply_buffer[ST0] >> 5); + return FDC_82078_UNKN; + } +} /* get_fdc_version */ + +/* lilo configuration */ + +static void __init floppy_set_flags(int *ints, int param, int param2) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { + if (param) + default_drive_params[i].params.flags |= param2; + else + default_drive_params[i].params.flags &= ~param2; + } + DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param); +} + +static void __init daring(int *ints, int param, int param2) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { + if (param) { + default_drive_params[i].params.select_delay = 0; + default_drive_params[i].params.flags |= + FD_SILENT_DCL_CLEAR; + } else { + default_drive_params[i].params.select_delay = + 2 * HZ / 100; + default_drive_params[i].params.flags &= + ~FD_SILENT_DCL_CLEAR; + } + } + DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken"); +} + +static void __init set_cmos(int *ints, int dummy, int dummy2) +{ + int current_drive = 0; + + if (ints[0] != 2) { + DPRINT("wrong number of parameters for CMOS\n"); + return; + } + current_drive = ints[1]; + if (current_drive < 0 || current_drive >= 8) { + DPRINT("bad drive for set_cmos\n"); + return; + } +#if N_FDC > 1 + if (current_drive >= 4 && !FDC2) + FDC2 = 0x370; +#endif + drive_params[current_drive].cmos = ints[2]; + DPRINT("setting CMOS code to %d\n", ints[2]); +} + +static struct param_table { + const char *name; + void (*fn) (int *ints, int param, int param2); + int *var; + int def_param; + int param2; +} config_params[] __initdata = { + {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ + {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ + {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0}, + {"irq", NULL, &FLOPPY_IRQ, 6, 0}, + {"dma", NULL, &FLOPPY_DMA, 2, 0}, + {"daring", daring, NULL, 1, 0}, +#if N_FDC > 1 + {"two_fdc", NULL, &FDC2, 0x370, 0}, + {"one_fdc", NULL, &FDC2, 0, 0}, +#endif + {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL}, + {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL}, + {"messages", floppy_set_flags, NULL, 1, FTD_MSG}, + {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR}, + {"debug", floppy_set_flags, NULL, 1, FD_DEBUG}, + {"nodma", NULL, &can_use_virtual_dma, 1, 0}, + {"omnibook", NULL, &can_use_virtual_dma, 1, 0}, + {"yesdma", NULL, &can_use_virtual_dma, 0, 0}, + {"fifo_depth", NULL, &fifo_depth, 0xa, 0}, + {"nofifo", NULL, &no_fifo, 0x20, 0}, + {"usefifo", NULL, &no_fifo, 0, 0}, + {"cmos", set_cmos, NULL, 0, 0}, + {"slow", NULL, &slow_floppy, 1, 0}, + {"unexpected_interrupts", NULL, &print_unex, 1, 0}, + {"no_unexpected_interrupts", NULL, &print_unex, 0, 0}, + {"L40SX", NULL, &print_unex, 0, 0} + + EXTRA_FLOPPY_PARAMS +}; + +static int __init floppy_setup(char *str) +{ + int i; + int param; + int ints[11]; + + str = get_options(str, ARRAY_SIZE(ints), ints); + if (str) { + for (i = 0; i < ARRAY_SIZE(config_params); i++) { + if (strcmp(str, config_params[i].name) == 0) { + if (ints[0]) + param = ints[1]; + else + param = config_params[i].def_param; + if (config_params[i].fn) + config_params[i].fn(ints, param, + config_params[i]. + param2); + if (config_params[i].var) { + DPRINT("%s=%d\n", str, param); + *config_params[i].var = param; + } + return 1; + } + } + } + if (str) { + DPRINT("unknown floppy option [%s]\n", str); + + DPRINT("allowed options are:"); + for (i = 0; i < ARRAY_SIZE(config_params); i++) + pr_cont(" %s", config_params[i].name); + pr_cont("\n"); + } else + DPRINT("botched floppy option\n"); + DPRINT("Read Documentation/admin-guide/blockdev/floppy.rst\n"); + return 0; +} + +static int have_no_fdc = -ENODEV; + +static ssize_t floppy_cmos_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct platform_device *p = to_platform_device(dev); + int drive; + + drive = p->id; + return sprintf(buf, "%X\n", drive_params[drive].cmos); +} + +static DEVICE_ATTR(cmos, 0444, floppy_cmos_show, NULL); + +static struct attribute *floppy_dev_attrs[] = { + &dev_attr_cmos.attr, + NULL +}; + +ATTRIBUTE_GROUPS(floppy_dev); + +static void floppy_device_release(struct device *dev) +{ +} + +static int floppy_resume(struct device *dev) +{ + int fdc; + int saved_drive; + + saved_drive = current_drive; + for (fdc = 0; fdc < N_FDC; fdc++) + if (fdc_state[fdc].address != -1) + user_reset_fdc(REVDRIVE(fdc, 0), FD_RESET_ALWAYS, false); + set_fdc(saved_drive); + return 0; +} + +static const struct dev_pm_ops floppy_pm_ops = { + .resume = floppy_resume, + .restore = floppy_resume, +}; + +static struct platform_driver floppy_driver = { + .driver = { + .name = "floppy", + .pm = &floppy_pm_ops, + }, +}; + +static const struct blk_mq_ops floppy_mq_ops = { + .queue_rq = floppy_queue_rq, +}; + +static struct platform_device floppy_device[N_DRIVE]; +static bool registered[N_DRIVE]; + +static bool floppy_available(int drive) +{ + if (!(allowed_drive_mask & (1 << drive))) + return false; + if (fdc_state[FDC(drive)].version == FDC_NONE) + return false; + return true; +} + +static int floppy_alloc_disk(unsigned int drive, unsigned int type) +{ + struct gendisk *disk; + + disk = blk_mq_alloc_disk(&tag_sets[drive], NULL); + if (IS_ERR(disk)) + return PTR_ERR(disk); + + blk_queue_max_hw_sectors(disk->queue, 64); + disk->major = FLOPPY_MAJOR; + disk->first_minor = TOMINOR(drive) | (type << 2); + disk->minors = 1; + disk->fops = &floppy_fops; + disk->flags |= GENHD_FL_NO_PART; + disk->events = DISK_EVENT_MEDIA_CHANGE; + if (type) + sprintf(disk->disk_name, "fd%d_type%d", drive, type); + else + sprintf(disk->disk_name, "fd%d", drive); + /* to be cleaned up... */ + disk->private_data = (void *)(long)drive; + disk->flags |= GENHD_FL_REMOVABLE; + + disks[drive][type] = disk; + return 0; +} + +static DEFINE_MUTEX(floppy_probe_lock); + +static void floppy_probe(dev_t dev) +{ + unsigned int drive = (MINOR(dev) & 3) | ((MINOR(dev) & 0x80) >> 5); + unsigned int type = (MINOR(dev) >> 2) & 0x1f; + + if (drive >= N_DRIVE || !floppy_available(drive) || + type >= ARRAY_SIZE(floppy_type)) + return; + + mutex_lock(&floppy_probe_lock); + if (disks[drive][type]) + goto out; + if (floppy_alloc_disk(drive, type)) + goto out; + if (add_disk(disks[drive][type])) + goto cleanup_disk; +out: + mutex_unlock(&floppy_probe_lock); + return; + +cleanup_disk: + put_disk(disks[drive][type]); + disks[drive][type] = NULL; + mutex_unlock(&floppy_probe_lock); +} + +static int __init do_floppy_init(void) +{ + int i, unit, drive, err; + + set_debugt(); + interruptjiffies = resultjiffies = jiffies; + +#if defined(CONFIG_PPC) + if (check_legacy_ioport(FDC1)) + return -ENODEV; +#endif + + raw_cmd = NULL; + + floppy_wq = alloc_ordered_workqueue("floppy", 0); + if (!floppy_wq) + return -ENOMEM; + + for (drive = 0; drive < N_DRIVE; drive++) { + memset(&tag_sets[drive], 0, sizeof(tag_sets[drive])); + tag_sets[drive].ops = &floppy_mq_ops; + tag_sets[drive].nr_hw_queues = 1; + tag_sets[drive].nr_maps = 1; + tag_sets[drive].queue_depth = 2; + tag_sets[drive].numa_node = NUMA_NO_NODE; + tag_sets[drive].flags = BLK_MQ_F_SHOULD_MERGE; + err = blk_mq_alloc_tag_set(&tag_sets[drive]); + if (err) + goto out_put_disk; + + err = floppy_alloc_disk(drive, 0); + if (err) { + blk_mq_free_tag_set(&tag_sets[drive]); + goto out_put_disk; + } + + timer_setup(&motor_off_timer[drive], motor_off_callback, 0); + } + + err = __register_blkdev(FLOPPY_MAJOR, "fd", floppy_probe); + if (err) + goto out_put_disk; + + err = platform_driver_register(&floppy_driver); + if (err) + goto out_unreg_blkdev; + + for (i = 0; i < 256; i++) + if (ITYPE(i)) + floppy_sizes[i] = floppy_type[ITYPE(i)].size; + else + floppy_sizes[i] = MAX_DISK_SIZE << 1; + + reschedule_timeout(MAXTIMEOUT, "floppy init"); + config_types(); + + for (i = 0; i < N_FDC; i++) { + memset(&fdc_state[i], 0, sizeof(*fdc_state)); + fdc_state[i].dtr = -1; + fdc_state[i].dor = 0x4; +#if defined(__sparc__) || defined(__mc68000__) + /*sparcs/sun3x don't have a DOR reset which we can fall back on to */ +#ifdef __mc68000__ + if (MACH_IS_SUN3X) +#endif + fdc_state[i].version = FDC_82072A; +#endif + } + + use_virtual_dma = can_use_virtual_dma & 1; + fdc_state[0].address = FDC1; + if (fdc_state[0].address == -1) { + cancel_delayed_work(&fd_timeout); + err = -ENODEV; + goto out_unreg_driver; + } +#if N_FDC > 1 + fdc_state[1].address = FDC2; +#endif + + current_fdc = 0; /* reset fdc in case of unexpected interrupt */ + err = floppy_grab_irq_and_dma(); + if (err) { + cancel_delayed_work(&fd_timeout); + err = -EBUSY; + goto out_unreg_driver; + } + + /* initialise drive state */ + for (drive = 0; drive < N_DRIVE; drive++) { + memset(&drive_state[drive], 0, sizeof(drive_state[drive])); + memset(&write_errors[drive], 0, sizeof(write_errors[drive])); + set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags); + set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); + set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); + drive_state[drive].fd_device = -1; + floppy_track_buffer = NULL; + max_buffer_sectors = 0; + } + /* + * Small 10 msec delay to let through any interrupt that + * initialization might have triggered, to not + * confuse detection: + */ + msleep(10); + + for (i = 0; i < N_FDC; i++) { + fdc_state[i].driver_version = FD_DRIVER_VERSION; + for (unit = 0; unit < 4; unit++) + fdc_state[i].track[unit] = 0; + if (fdc_state[i].address == -1) + continue; + fdc_state[i].rawcmd = 2; + if (user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false)) { + /* free ioports reserved by floppy_grab_irq_and_dma() */ + floppy_release_regions(i); + fdc_state[i].address = -1; + fdc_state[i].version = FDC_NONE; + continue; + } + /* Try to determine the floppy controller type */ + fdc_state[i].version = get_fdc_version(i); + if (fdc_state[i].version == FDC_NONE) { + /* free ioports reserved by floppy_grab_irq_and_dma() */ + floppy_release_regions(i); + fdc_state[i].address = -1; + continue; + } + if (can_use_virtual_dma == 2 && + fdc_state[i].version < FDC_82072A) + can_use_virtual_dma = 0; + + have_no_fdc = 0; + /* Not all FDCs seem to be able to handle the version command + * properly, so force a reset for the standard FDC clones, + * to avoid interrupt garbage. + */ + user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false); + } + current_fdc = 0; + cancel_delayed_work(&fd_timeout); + current_drive = 0; + initialized = true; + if (have_no_fdc) { + DPRINT("no floppy controllers found\n"); + err = have_no_fdc; + goto out_release_dma; + } + + for (drive = 0; drive < N_DRIVE; drive++) { + if (!floppy_available(drive)) + continue; + + floppy_device[drive].name = floppy_device_name; + floppy_device[drive].id = drive; + floppy_device[drive].dev.release = floppy_device_release; + floppy_device[drive].dev.groups = floppy_dev_groups; + + err = platform_device_register(&floppy_device[drive]); + if (err) + goto out_remove_drives; + + registered[drive] = true; + + err = device_add_disk(&floppy_device[drive].dev, + disks[drive][0], NULL); + if (err) + goto out_remove_drives; + } + + return 0; + +out_remove_drives: + while (drive--) { + if (floppy_available(drive)) { + del_gendisk(disks[drive][0]); + if (registered[drive]) + platform_device_unregister(&floppy_device[drive]); + } + } +out_release_dma: + if (atomic_read(&usage_count)) + floppy_release_irq_and_dma(); +out_unreg_driver: + platform_driver_unregister(&floppy_driver); +out_unreg_blkdev: + unregister_blkdev(FLOPPY_MAJOR, "fd"); +out_put_disk: + destroy_workqueue(floppy_wq); + for (drive = 0; drive < N_DRIVE; drive++) { + if (!disks[drive][0]) + break; + del_timer_sync(&motor_off_timer[drive]); + put_disk(disks[drive][0]); + blk_mq_free_tag_set(&tag_sets[drive]); + } + return err; +} + +#ifndef MODULE +static __init void floppy_async_init(void *data, async_cookie_t cookie) +{ + do_floppy_init(); +} +#endif + +static int __init floppy_init(void) +{ +#ifdef MODULE + return do_floppy_init(); +#else + /* Don't hold up the bootup by the floppy initialization */ + async_schedule(floppy_async_init, NULL); + return 0; +#endif +} + +static const struct io_region { + int offset; + int size; +} io_regions[] = { + { 2, 1 }, + /* address + 3 is sometimes reserved by pnp bios for motherboard */ + { 4, 2 }, + /* address + 6 is reserved, and may be taken by IDE. + * Unfortunately, Adaptec doesn't know this :-(, */ + { 7, 1 }, +}; + +static void floppy_release_allocated_regions(int fdc, const struct io_region *p) +{ + while (p != io_regions) { + p--; + release_region(fdc_state[fdc].address + p->offset, p->size); + } +} + +#define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)])) + +static int floppy_request_regions(int fdc) +{ + const struct io_region *p; + + for (p = io_regions; p < ARRAY_END(io_regions); p++) { + if (!request_region(fdc_state[fdc].address + p->offset, + p->size, "floppy")) { + DPRINT("Floppy io-port 0x%04lx in use\n", + fdc_state[fdc].address + p->offset); + floppy_release_allocated_regions(fdc, p); + return -EBUSY; + } + } + return 0; +} + +static void floppy_release_regions(int fdc) +{ + floppy_release_allocated_regions(fdc, ARRAY_END(io_regions)); +} + +static int floppy_grab_irq_and_dma(void) +{ + int fdc; + + if (atomic_inc_return(&usage_count) > 1) + return 0; + + /* + * We might have scheduled a free_irq(), wait it to + * drain first: + */ + flush_workqueue(floppy_wq); + + if (fd_request_irq()) { + DPRINT("Unable to grab IRQ%d for the floppy driver\n", + FLOPPY_IRQ); + atomic_dec(&usage_count); + return -1; + } + if (fd_request_dma()) { + DPRINT("Unable to grab DMA%d for the floppy driver\n", + FLOPPY_DMA); + if (can_use_virtual_dma & 2) + use_virtual_dma = can_use_virtual_dma = 1; + if (!(can_use_virtual_dma & 1)) { + fd_free_irq(); + atomic_dec(&usage_count); + return -1; + } + } + + for (fdc = 0; fdc < N_FDC; fdc++) { + if (fdc_state[fdc].address != -1) { + if (floppy_request_regions(fdc)) + goto cleanup; + } + } + for (fdc = 0; fdc < N_FDC; fdc++) { + if (fdc_state[fdc].address != -1) { + reset_fdc_info(fdc, 1); + fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR); + } + } + + set_dor(0, ~0, 8); /* avoid immediate interrupt */ + + for (fdc = 0; fdc < N_FDC; fdc++) + if (fdc_state[fdc].address != -1) + fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR); + /* + * The driver will try and free resources and relies on us + * to know if they were allocated or not. + */ + current_fdc = 0; + irqdma_allocated = 1; + return 0; +cleanup: + fd_free_irq(); + fd_free_dma(); + while (--fdc >= 0) + floppy_release_regions(fdc); + current_fdc = 0; + atomic_dec(&usage_count); + return -1; +} + +static void floppy_release_irq_and_dma(void) +{ + int fdc; +#ifndef __sparc__ + int drive; +#endif + long tmpsize; + unsigned long tmpaddr; + + if (!atomic_dec_and_test(&usage_count)) + return; + + if (irqdma_allocated) { + fd_disable_dma(); + fd_free_dma(); + fd_free_irq(); + irqdma_allocated = 0; + } + set_dor(0, ~0, 8); +#if N_FDC > 1 + set_dor(1, ~8, 0); +#endif + + if (floppy_track_buffer && max_buffer_sectors) { + tmpsize = max_buffer_sectors * 1024; + tmpaddr = (unsigned long)floppy_track_buffer; + floppy_track_buffer = NULL; + max_buffer_sectors = 0; + buffer_min = buffer_max = -1; + fd_dma_mem_free(tmpaddr, tmpsize); + } +#ifndef __sparc__ + for (drive = 0; drive < N_FDC * 4; drive++) + if (timer_pending(motor_off_timer + drive)) + pr_info("motor off timer %d still active\n", drive); +#endif + + if (delayed_work_pending(&fd_timeout)) + pr_info("floppy timer still active:%s\n", timeout_message); + if (delayed_work_pending(&fd_timer)) + pr_info("auxiliary floppy timer still active\n"); + if (work_pending(&floppy_work)) + pr_info("work still pending\n"); + for (fdc = 0; fdc < N_FDC; fdc++) + if (fdc_state[fdc].address != -1) + floppy_release_regions(fdc); +} + +#ifdef MODULE + +static char *floppy; + +static void __init parse_floppy_cfg_string(char *cfg) +{ + char *ptr; + + while (*cfg) { + ptr = cfg; + while (*cfg && *cfg != ' ' && *cfg != '\t') + cfg++; + if (*cfg) { + *cfg = '\0'; + cfg++; + } + if (*ptr) + floppy_setup(ptr); + } +} + +static int __init floppy_module_init(void) +{ + if (floppy) + parse_floppy_cfg_string(floppy); + return floppy_init(); +} +module_init(floppy_module_init); + +static void __exit floppy_module_exit(void) +{ + int drive, i; + + unregister_blkdev(FLOPPY_MAJOR, "fd"); + platform_driver_unregister(&floppy_driver); + + destroy_workqueue(floppy_wq); + + for (drive = 0; drive < N_DRIVE; drive++) { + del_timer_sync(&motor_off_timer[drive]); + + if (floppy_available(drive)) { + for (i = 0; i < ARRAY_SIZE(floppy_type); i++) { + if (disks[drive][i]) + del_gendisk(disks[drive][i]); + } + if (registered[drive]) + platform_device_unregister(&floppy_device[drive]); + } + for (i = 0; i < ARRAY_SIZE(floppy_type); i++) { + if (disks[drive][i]) + put_disk(disks[drive][i]); + } + blk_mq_free_tag_set(&tag_sets[drive]); + } + + cancel_delayed_work_sync(&fd_timeout); + cancel_delayed_work_sync(&fd_timer); + + if (atomic_read(&usage_count)) + floppy_release_irq_and_dma(); + + /* eject disk, if any */ + fd_eject(0); +} + +module_exit(floppy_module_exit); + +module_param(floppy, charp, 0); +module_param(FLOPPY_IRQ, int, 0); +module_param(FLOPPY_DMA, int, 0); +MODULE_AUTHOR("Alain L. Knaff"); +MODULE_LICENSE("GPL"); + +/* This doesn't actually get used other than for module information */ +static const struct pnp_device_id floppy_pnpids[] = { + {"PNP0700", 0}, + {} +}; + +MODULE_DEVICE_TABLE(pnp, floppy_pnpids); + +#else + +__setup("floppy=", floppy_setup); +module_init(floppy_init) +#endif + +MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); |