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Diffstat (limited to 'drivers/block/ataflop.c')
| -rw-r--r-- | drivers/block/ataflop.c | 2198 |
1 files changed, 2198 insertions, 0 deletions
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c new file mode 100644 index 0000000000..cd738cab72 --- /dev/null +++ b/drivers/block/ataflop.c @@ -0,0 +1,2198 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * drivers/block/ataflop.c + * + * Copyright (C) 1993 Greg Harp + * Atari Support by Bjoern Brauel, Roman Hodek + * + * Big cleanup Sep 11..14 1994 Roman Hodek: + * - Driver now works interrupt driven + * - Support for two drives; should work, but I cannot test that :-( + * - Reading is done in whole tracks and buffered to speed up things + * - Disk change detection and drive deselecting after motor-off + * similar to TOS + * - Autodetection of disk format (DD/HD); untested yet, because I + * don't have an HD drive :-( + * + * Fixes Nov 13 1994 Martin Schaller: + * - Autodetection works now + * - Support for 5 1/4'' disks + * - Removed drive type (unknown on atari) + * - Do seeks with 8 Mhz + * + * Changes by Andreas Schwab: + * - After errors in multiple read mode try again reading single sectors + * (Feb 1995): + * - Clean up error handling + * - Set blk_size for proper size checking + * - Initialize track register when testing presence of floppy + * - Implement some ioctl's + * + * Changes by Torsten Lang: + * - When probing the floppies we should add the FDCCMDADD_H flag since + * the FDC will otherwise wait forever when no disk is inserted... + * + * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa: + * - MFPDELAY() after each FDC access -> atari + * - more/other disk formats + * - DMA to the block buffer directly if we have a 32bit DMA + * - for medusa, the step rate is always 3ms + * - on medusa, use only cache_push() + * Roman: + * - Make disk format numbering independent from minors + * - Let user set max. supported drive type (speeds up format + * detection, saves buffer space) + * + * Roman 10/15/95: + * - implement some more ioctls + * - disk formatting + * + * Andreas 95/12/12: + * - increase gap size at start of track for HD/ED disks + * + * Michael (MSch) 11/07/96: + * - implemented FDSETPRM and FDDEFPRM ioctl + * + * Andreas (97/03/19): + * - implemented missing BLK* ioctls + * + * Things left to do: + * - Formatting + * - Maybe a better strategy for disk change detection (does anyone + * know one?) + */ + +#include <linux/module.h> + +#include <linux/fd.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/blk-mq.h> +#include <linux/major.h> +#include <linux/mutex.h> +#include <linux/completion.h> +#include <linux/wait.h> + +#include <asm/atariints.h> +#include <asm/atari_stdma.h> +#include <asm/atari_stram.h> + +#define FD_MAX_UNITS 2 + +#undef DEBUG + +static DEFINE_MUTEX(ataflop_mutex); +static struct request *fd_request; + +/* + * WD1772 stuff + */ + +/* register codes */ + +#define FDCSELREG_STP (0x80) /* command/status register */ +#define FDCSELREG_TRA (0x82) /* track register */ +#define FDCSELREG_SEC (0x84) /* sector register */ +#define FDCSELREG_DTA (0x86) /* data register */ + +/* register names for FDC_READ/WRITE macros */ + +#define FDCREG_CMD 0 +#define FDCREG_STATUS 0 +#define FDCREG_TRACK 2 +#define FDCREG_SECTOR 4 +#define FDCREG_DATA 6 + +/* command opcodes */ + +#define FDCCMD_RESTORE (0x00) /* - */ +#define FDCCMD_SEEK (0x10) /* | */ +#define FDCCMD_STEP (0x20) /* | TYP 1 Commands */ +#define FDCCMD_STIN (0x40) /* | */ +#define FDCCMD_STOT (0x60) /* - */ +#define FDCCMD_RDSEC (0x80) /* - TYP 2 Commands */ +#define FDCCMD_WRSEC (0xa0) /* - " */ +#define FDCCMD_RDADR (0xc0) /* - */ +#define FDCCMD_RDTRA (0xe0) /* | TYP 3 Commands */ +#define FDCCMD_WRTRA (0xf0) /* - */ +#define FDCCMD_FORCI (0xd0) /* - TYP 4 Command */ + +/* command modifier bits */ + +#define FDCCMDADD_SR6 (0x00) /* step rate settings */ +#define FDCCMDADD_SR12 (0x01) +#define FDCCMDADD_SR2 (0x02) +#define FDCCMDADD_SR3 (0x03) +#define FDCCMDADD_V (0x04) /* verify */ +#define FDCCMDADD_H (0x08) /* wait for spin-up */ +#define FDCCMDADD_U (0x10) /* update track register */ +#define FDCCMDADD_M (0x10) /* multiple sector access */ +#define FDCCMDADD_E (0x04) /* head settling flag */ +#define FDCCMDADD_P (0x02) /* precompensation off */ +#define FDCCMDADD_A0 (0x01) /* DAM flag */ + +/* status register bits */ + +#define FDCSTAT_MOTORON (0x80) /* motor on */ +#define FDCSTAT_WPROT (0x40) /* write protected (FDCCMD_WR*) */ +#define FDCSTAT_SPINUP (0x20) /* motor speed stable (Type I) */ +#define FDCSTAT_DELDAM (0x20) /* sector has deleted DAM (Type II+III) */ +#define FDCSTAT_RECNF (0x10) /* record not found */ +#define FDCSTAT_CRC (0x08) /* CRC error */ +#define FDCSTAT_TR00 (0x04) /* Track 00 flag (Type I) */ +#define FDCSTAT_LOST (0x04) /* Lost Data (Type II+III) */ +#define FDCSTAT_IDX (0x02) /* Index status (Type I) */ +#define FDCSTAT_DRQ (0x02) /* DRQ status (Type II+III) */ +#define FDCSTAT_BUSY (0x01) /* FDC is busy */ + + +/* PSG Port A Bit Nr 0 .. Side Sel .. 0 -> Side 1 1 -> Side 2 */ +#define DSKSIDE (0x01) + +#define DSKDRVNONE (0x06) +#define DSKDRV0 (0x02) +#define DSKDRV1 (0x04) + +/* step rates */ +#define FDCSTEP_6 0x00 +#define FDCSTEP_12 0x01 +#define FDCSTEP_2 0x02 +#define FDCSTEP_3 0x03 + +struct atari_format_descr { + int track; /* to be formatted */ + int head; /* "" "" */ + int sect_offset; /* offset of first sector */ +}; + +/* Disk types: DD, HD, ED */ +static struct atari_disk_type { + const char *name; + unsigned spt; /* sectors per track */ + unsigned blocks; /* total number of blocks */ + unsigned fdc_speed; /* fdc_speed setting */ + unsigned stretch; /* track doubling ? */ +} atari_disk_type[] = { + { "d360", 9, 720, 0, 0}, /* 0: 360kB diskette */ + { "D360", 9, 720, 0, 1}, /* 1: 360kb in 720k or 1.2MB drive */ + { "D720", 9,1440, 0, 0}, /* 2: 720kb in 720k or 1.2MB drive */ + { "D820", 10,1640, 0, 0}, /* 3: DD disk with 82 tracks/10 sectors */ +/* formats above are probed for type DD */ +#define MAX_TYPE_DD 3 + { "h1200",15,2400, 3, 0}, /* 4: 1.2MB diskette */ + { "H1440",18,2880, 3, 0}, /* 5: 1.4 MB diskette (HD) */ + { "H1640",20,3280, 3, 0}, /* 6: 1.64MB diskette (fat HD) 82 tr 20 sec */ +/* formats above are probed for types DD and HD */ +#define MAX_TYPE_HD 6 + { "E2880",36,5760, 3, 0}, /* 7: 2.8 MB diskette (ED) */ + { "E3280",40,6560, 3, 0}, /* 8: 3.2 MB diskette (fat ED) 82 tr 40 sec */ +/* formats above are probed for types DD, HD and ED */ +#define MAX_TYPE_ED 8 +/* types below are never autoprobed */ + { "H1680",21,3360, 3, 0}, /* 9: 1.68MB diskette (fat HD) 80 tr 21 sec */ + { "h410",10,820, 0, 1}, /* 10: 410k diskette 41 tr 10 sec, stretch */ + { "h1476",18,2952, 3, 0}, /* 11: 1.48MB diskette 82 tr 18 sec */ + { "H1722",21,3444, 3, 0}, /* 12: 1.72MB diskette 82 tr 21 sec */ + { "h420",10,840, 0, 1}, /* 13: 420k diskette 42 tr 10 sec, stretch */ + { "H830",10,1660, 0, 0}, /* 14: 820k diskette 83 tr 10 sec */ + { "h1494",18,2952, 3, 0}, /* 15: 1.49MB diskette 83 tr 18 sec */ + { "H1743",21,3486, 3, 0}, /* 16: 1.74MB diskette 83 tr 21 sec */ + { "h880",11,1760, 0, 0}, /* 17: 880k diskette 80 tr 11 sec */ + { "D1040",13,2080, 0, 0}, /* 18: 1.04MB diskette 80 tr 13 sec */ + { "D1120",14,2240, 0, 0}, /* 19: 1.12MB diskette 80 tr 14 sec */ + { "h1600",20,3200, 3, 0}, /* 20: 1.60MB diskette 80 tr 20 sec */ + { "H1760",22,3520, 3, 0}, /* 21: 1.76MB diskette 80 tr 22 sec */ + { "H1920",24,3840, 3, 0}, /* 22: 1.92MB diskette 80 tr 24 sec */ + { "E3200",40,6400, 3, 0}, /* 23: 3.2MB diskette 80 tr 40 sec */ + { "E3520",44,7040, 3, 0}, /* 24: 3.52MB diskette 80 tr 44 sec */ + { "E3840",48,7680, 3, 0}, /* 25: 3.84MB diskette 80 tr 48 sec */ + { "H1840",23,3680, 3, 0}, /* 26: 1.84MB diskette 80 tr 23 sec */ + { "D800",10,1600, 0, 0}, /* 27: 800k diskette 80 tr 10 sec */ +}; + +static int StartDiskType[] = { + MAX_TYPE_DD, + MAX_TYPE_HD, + MAX_TYPE_ED +}; + +#define TYPE_DD 0 +#define TYPE_HD 1 +#define TYPE_ED 2 + +static int DriveType = TYPE_HD; + +static DEFINE_SPINLOCK(ataflop_lock); + +/* Array for translating minors into disk formats */ +static struct { + int index; + unsigned drive_types; +} minor2disktype[] = { + { 0, TYPE_DD }, /* 1: d360 */ + { 4, TYPE_HD }, /* 2: h1200 */ + { 1, TYPE_DD }, /* 3: D360 */ + { 2, TYPE_DD }, /* 4: D720 */ + { 1, TYPE_DD }, /* 5: h360 = D360 */ + { 2, TYPE_DD }, /* 6: h720 = D720 */ + { 5, TYPE_HD }, /* 7: H1440 */ + { 7, TYPE_ED }, /* 8: E2880 */ +/* some PC formats :-) */ + { 8, TYPE_ED }, /* 9: E3280 <- was "CompaQ" == E2880 for PC */ + { 5, TYPE_HD }, /* 10: h1440 = H1440 */ + { 9, TYPE_HD }, /* 11: H1680 */ + { 10, TYPE_DD }, /* 12: h410 */ + { 3, TYPE_DD }, /* 13: H820 <- == D820, 82x10 */ + { 11, TYPE_HD }, /* 14: h1476 */ + { 12, TYPE_HD }, /* 15: H1722 */ + { 13, TYPE_DD }, /* 16: h420 */ + { 14, TYPE_DD }, /* 17: H830 */ + { 15, TYPE_HD }, /* 18: h1494 */ + { 16, TYPE_HD }, /* 19: H1743 */ + { 17, TYPE_DD }, /* 20: h880 */ + { 18, TYPE_DD }, /* 21: D1040 */ + { 19, TYPE_DD }, /* 22: D1120 */ + { 20, TYPE_HD }, /* 23: h1600 */ + { 21, TYPE_HD }, /* 24: H1760 */ + { 22, TYPE_HD }, /* 25: H1920 */ + { 23, TYPE_ED }, /* 26: E3200 */ + { 24, TYPE_ED }, /* 27: E3520 */ + { 25, TYPE_ED }, /* 28: E3840 */ + { 26, TYPE_HD }, /* 29: H1840 */ + { 27, TYPE_DD }, /* 30: D800 */ + { 6, TYPE_HD }, /* 31: H1640 <- was H1600 == h1600 for PC */ +}; + +#define NUM_DISK_MINORS ARRAY_SIZE(minor2disktype) + +/* + * Maximum disk size (in kilobytes). This default is used whenever the + * current disk size is unknown. + */ +#define MAX_DISK_SIZE 3280 + +/* + * MSch: User-provided type information. 'drive' points to + * the respective entry of this array. Set by FDSETPRM ioctls. + */ +static struct atari_disk_type user_params[FD_MAX_UNITS]; + +/* + * User-provided permanent type information. 'drive' points to + * the respective entry of this array. Set by FDDEFPRM ioctls, + * restored upon disk change by floppy_revalidate() if valid (as seen by + * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?) + */ +static struct atari_disk_type default_params[FD_MAX_UNITS]; + +/* current info on each unit */ +static struct atari_floppy_struct { + int connected; /* !=0 : drive is connected */ + int autoprobe; /* !=0 : do autoprobe */ + + struct atari_disk_type *disktype; /* current type of disk */ + + int track; /* current head position or -1 if + unknown */ + unsigned int steprate; /* steprate setting */ + unsigned int wpstat; /* current state of WP signal (for + disk change detection) */ + int flags; /* flags */ + struct gendisk *disk[NUM_DISK_MINORS]; + bool registered[NUM_DISK_MINORS]; + int ref; + int type; + struct blk_mq_tag_set tag_set; + int error_count; +} unit[FD_MAX_UNITS]; + +#define UD unit[drive] +#define UDT unit[drive].disktype +#define SUD unit[SelectedDrive] +#define SUDT unit[SelectedDrive].disktype + + +#define FDC_READ(reg) ({ \ + /* unsigned long __flags; */ \ + unsigned short __val; \ + /* local_irq_save(__flags); */ \ + dma_wd.dma_mode_status = 0x80 | (reg); \ + udelay(25); \ + __val = dma_wd.fdc_acces_seccount; \ + MFPDELAY(); \ + /* local_irq_restore(__flags); */ \ + __val & 0xff; \ +}) + +#define FDC_WRITE(reg,val) \ + do { \ + /* unsigned long __flags; */ \ + /* local_irq_save(__flags); */ \ + dma_wd.dma_mode_status = 0x80 | (reg); \ + udelay(25); \ + dma_wd.fdc_acces_seccount = (val); \ + MFPDELAY(); \ + /* local_irq_restore(__flags); */ \ + } while(0) + + +/* Buffering variables: + * First, there is a DMA buffer in ST-RAM that is used for floppy DMA + * operations. Second, a track buffer is used to cache a whole track + * of the disk to save read operations. These are two separate buffers + * because that allows write operations without clearing the track buffer. + */ + +static int MaxSectors[] = { + 11, 22, 44 +}; +static int BufferSize[] = { + 15*512, 30*512, 60*512 +}; + +#define BUFFER_SIZE (BufferSize[DriveType]) + +unsigned char *DMABuffer; /* buffer for writes */ +static unsigned long PhysDMABuffer; /* physical address */ + +static int UseTrackbuffer = -1; /* Do track buffering? */ +module_param(UseTrackbuffer, int, 0); + +unsigned char *TrackBuffer; /* buffer for reads */ +static unsigned long PhysTrackBuffer; /* physical address */ +static int BufferDrive, BufferSide, BufferTrack; +static int read_track; /* non-zero if we are reading whole tracks */ + +#define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512) +#define IS_BUFFERED(drive,side,track) \ + (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track)) + +/* + * These are global variables, as that's the easiest way to give + * information to interrupts. They are the data used for the current + * request. + */ +static int SelectedDrive = 0; +static int ReqCmd, ReqBlock; +static int ReqSide, ReqTrack, ReqSector, ReqCnt; +static int HeadSettleFlag = 0; +static unsigned char *ReqData, *ReqBuffer; +static int MotorOn = 0, MotorOffTrys; +static int IsFormatting = 0, FormatError; + +static int UserSteprate[FD_MAX_UNITS] = { -1, -1 }; +module_param_array(UserSteprate, int, NULL, 0); + +static DECLARE_COMPLETION(format_wait); + +static unsigned long changed_floppies = 0xff, fake_change = 0; +#define CHECK_CHANGE_DELAY HZ/2 + +#define FD_MOTOR_OFF_DELAY (3*HZ) +#define FD_MOTOR_OFF_MAXTRY (10*20) + +#define FLOPPY_TIMEOUT (6*HZ) +#define RECALIBRATE_ERRORS 4 /* After this many errors the drive + * will be recalibrated. */ +#define MAX_ERRORS 8 /* After this many errors the driver + * will give up. */ + + +/* + * The driver is trying to determine the correct media format + * while Probing is set. fd_rwsec_done() clears it after a + * successful access. + */ +static int Probing = 0; + +/* This flag is set when a dummy seek is necessary to make the WP + * status bit accessible. + */ +static int NeedSeek = 0; + + +#ifdef DEBUG +#define DPRINT(a) printk a +#else +#define DPRINT(a) +#endif + +/***************************** Prototypes *****************************/ + +static void fd_select_side( int side ); +static void fd_select_drive( int drive ); +static void fd_deselect( void ); +static void fd_motor_off_timer(struct timer_list *unused); +static void check_change(struct timer_list *unused); +static irqreturn_t floppy_irq (int irq, void *dummy); +static void fd_error( void ); +static int do_format(int drive, int type, struct atari_format_descr *desc); +static void do_fd_action( int drive ); +static void fd_calibrate( void ); +static void fd_calibrate_done( int status ); +static void fd_seek( void ); +static void fd_seek_done( int status ); +static void fd_rwsec( void ); +static void fd_readtrack_check(struct timer_list *unused); +static void fd_rwsec_done( int status ); +static void fd_rwsec_done1(int status); +static void fd_writetrack( void ); +static void fd_writetrack_done( int status ); +static void fd_times_out(struct timer_list *unused); +static void finish_fdc( void ); +static void finish_fdc_done( int dummy ); +static void setup_req_params( int drive ); +static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long param); +static void fd_probe( int drive ); +static int fd_test_drive_present( int drive ); +static void config_types( void ); +static int floppy_open(struct gendisk *disk, blk_mode_t mode); +static void floppy_release(struct gendisk *disk); + +/************************* End of Prototypes **************************/ + +static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer); +static DEFINE_TIMER(readtrack_timer, fd_readtrack_check); +static DEFINE_TIMER(timeout_timer, fd_times_out); +static DEFINE_TIMER(fd_timer, check_change); + +static void fd_end_request_cur(blk_status_t err) +{ + DPRINT(("fd_end_request_cur(), bytes %d of %d\n", + blk_rq_cur_bytes(fd_request), + blk_rq_bytes(fd_request))); + + if (!blk_update_request(fd_request, err, + blk_rq_cur_bytes(fd_request))) { + DPRINT(("calling __blk_mq_end_request()\n")); + __blk_mq_end_request(fd_request, err); + fd_request = NULL; + } else { + /* requeue rest of request */ + DPRINT(("calling blk_mq_requeue_request()\n")); + blk_mq_requeue_request(fd_request, true); + fd_request = NULL; + } +} + +static inline void start_motor_off_timer(void) +{ + mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY); + MotorOffTrys = 0; +} + +static inline void start_check_change_timer( void ) +{ + mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY); +} + +static inline void start_timeout(void) +{ + mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT); +} + +static inline void stop_timeout(void) +{ + del_timer(&timeout_timer); +} + +/* Select the side to use. */ + +static void fd_select_side( int side ) +{ + unsigned long flags; + + /* protect against various other ints mucking around with the PSG */ + local_irq_save(flags); + + sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */ + sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 : + sound_ym.rd_data_reg_sel & 0xfe; + + local_irq_restore(flags); +} + + +/* Select a drive, update the FDC's track register and set the correct + * clock speed for this disk's type. + */ + +static void fd_select_drive( int drive ) +{ + unsigned long flags; + unsigned char tmp; + + if (drive == SelectedDrive) + return; + + /* protect against various other ints mucking around with the PSG */ + local_irq_save(flags); + sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */ + tmp = sound_ym.rd_data_reg_sel; + sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1); + atari_dont_touch_floppy_select = 1; + local_irq_restore(flags); + + /* restore track register to saved value */ + FDC_WRITE( FDCREG_TRACK, UD.track ); + udelay(25); + + /* select 8/16 MHz */ + if (UDT) + if (ATARIHW_PRESENT(FDCSPEED)) + dma_wd.fdc_speed = UDT->fdc_speed; + + SelectedDrive = drive; +} + + +/* Deselect both drives. */ + +static void fd_deselect( void ) +{ + unsigned long flags; + + /* protect against various other ints mucking around with the PSG */ + local_irq_save(flags); + atari_dont_touch_floppy_select = 0; + sound_ym.rd_data_reg_sel=14; /* Select PSG Port A */ + sound_ym.wd_data = (sound_ym.rd_data_reg_sel | + (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */ + /* On Falcon, the drive B select line is used on the printer port, so + * leave it alone... */ + SelectedDrive = -1; + local_irq_restore(flags); +} + + +/* This timer function deselects the drives when the FDC switched the + * motor off. The deselection cannot happen earlier because the FDC + * counts the index signals, which arrive only if one drive is selected. + */ + +static void fd_motor_off_timer(struct timer_list *unused) +{ + unsigned char status; + + if (SelectedDrive < 0) + /* no drive selected, needn't deselect anyone */ + return; + + if (stdma_islocked()) + goto retry; + + status = FDC_READ( FDCREG_STATUS ); + + if (!(status & 0x80)) { + /* motor already turned off by FDC -> deselect drives */ + MotorOn = 0; + fd_deselect(); + return; + } + /* not yet off, try again */ + + retry: + /* Test again later; if tested too often, it seems there is no disk + * in the drive and the FDC will leave the motor on forever (or, + * at least until a disk is inserted). So we'll test only twice + * per second from then on... + */ + mod_timer(&motor_off_timer, + jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2)); +} + + +/* This function is repeatedly called to detect disk changes (as good + * as possible) and keep track of the current state of the write protection. + */ + +static void check_change(struct timer_list *unused) +{ + static int drive = 0; + + unsigned long flags; + unsigned char old_porta; + int stat; + + if (++drive > 1 || !UD.connected) + drive = 0; + + /* protect against various other ints mucking around with the PSG */ + local_irq_save(flags); + + if (!stdma_islocked()) { + sound_ym.rd_data_reg_sel = 14; + old_porta = sound_ym.rd_data_reg_sel; + sound_ym.wd_data = (old_porta | DSKDRVNONE) & + ~(drive == 0 ? DSKDRV0 : DSKDRV1); + stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT); + sound_ym.wd_data = old_porta; + + if (stat != UD.wpstat) { + DPRINT(( "wpstat[%d] = %d\n", drive, stat )); + UD.wpstat = stat; + set_bit (drive, &changed_floppies); + } + } + local_irq_restore(flags); + + start_check_change_timer(); +} + + +/* Handling of the Head Settling Flag: This flag should be set after each + * seek operation, because we don't use seeks with verify. + */ + +static inline void set_head_settle_flag(void) +{ + HeadSettleFlag = FDCCMDADD_E; +} + +static inline int get_head_settle_flag(void) +{ + int tmp = HeadSettleFlag; + HeadSettleFlag = 0; + return( tmp ); +} + +static inline void copy_buffer(void *from, void *to) +{ + ulong *p1 = (ulong *)from, *p2 = (ulong *)to; + int cnt; + + for (cnt = 512/4; cnt; cnt--) + *p2++ = *p1++; +} + +/* General Interrupt Handling */ + +static void (*FloppyIRQHandler)( int status ) = NULL; + +static irqreturn_t floppy_irq (int irq, void *dummy) +{ + unsigned char status; + void (*handler)( int ); + + handler = xchg(&FloppyIRQHandler, NULL); + + if (handler) { + nop(); + status = FDC_READ( FDCREG_STATUS ); + DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler)); + handler( status ); + } + else { + DPRINT(("FDC irq, no handler\n")); + } + return IRQ_HANDLED; +} + + +/* Error handling: If some error happened, retry some times, then + * recalibrate, then try again, and fail after MAX_ERRORS. + */ + +static void fd_error( void ) +{ + if (IsFormatting) { + IsFormatting = 0; + FormatError = 1; + complete(&format_wait); + return; + } + + if (!fd_request) + return; + + unit[SelectedDrive].error_count++; + if (unit[SelectedDrive].error_count >= MAX_ERRORS) { + printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive ); + fd_end_request_cur(BLK_STS_IOERR); + finish_fdc(); + return; + } + else if (unit[SelectedDrive].error_count == RECALIBRATE_ERRORS) { + printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive ); + if (SelectedDrive != -1) + SUD.track = -1; + } + /* need to re-run request to recalibrate */ + atari_disable_irq( IRQ_MFP_FDC ); + + setup_req_params( SelectedDrive ); + do_fd_action( SelectedDrive ); + + atari_enable_irq( IRQ_MFP_FDC ); +} + + + +#define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0) + + +/* ---------- Formatting ---------- */ + +#define FILL(n,val) \ + do { \ + memset( p, val, n ); \ + p += n; \ + } while(0) + +static int do_format(int drive, int type, struct atari_format_descr *desc) +{ + struct request_queue *q; + unsigned char *p; + int sect, nsect; + unsigned long flags; + int ret; + + if (type) { + type--; + if (type >= NUM_DISK_MINORS || + minor2disktype[type].drive_types > DriveType) { + finish_fdc(); + return -EINVAL; + } + } + + q = unit[drive].disk[type]->queue; + blk_mq_freeze_queue(q); + blk_mq_quiesce_queue(q); + + local_irq_save(flags); + stdma_lock(floppy_irq, NULL); + atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */ + local_irq_restore(flags); + + if (type) { + type = minor2disktype[type].index; + UDT = &atari_disk_type[type]; + } + + if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) { + finish_fdc(); + ret = -EINVAL; + goto out; + } + + nsect = UDT->spt; + p = TrackBuffer; + /* The track buffer is used for the raw track data, so its + contents become invalid! */ + BufferDrive = -1; + /* stop deselect timer */ + del_timer( &motor_off_timer ); + + FILL( 60 * (nsect / 9), 0x4e ); + for( sect = 0; sect < nsect; ++sect ) { + FILL( 12, 0 ); + FILL( 3, 0xf5 ); + *p++ = 0xfe; + *p++ = desc->track; + *p++ = desc->head; + *p++ = (nsect + sect - desc->sect_offset) % nsect + 1; + *p++ = 2; + *p++ = 0xf7; + FILL( 22, 0x4e ); + FILL( 12, 0 ); + FILL( 3, 0xf5 ); + *p++ = 0xfb; + FILL( 512, 0xe5 ); + *p++ = 0xf7; + FILL( 40, 0x4e ); + } + FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e ); + + IsFormatting = 1; + FormatError = 0; + ReqTrack = desc->track; + ReqSide = desc->head; + do_fd_action( drive ); + + wait_for_completion(&format_wait); + + finish_fdc(); + ret = FormatError ? -EIO : 0; +out: + blk_mq_unquiesce_queue(q); + blk_mq_unfreeze_queue(q); + return ret; +} + + +/* do_fd_action() is the general procedure for a fd request: All + * required parameter settings (drive select, side select, track + * position) are checked and set if needed. For each of these + * parameters and the actual reading or writing exist two functions: + * one that starts the setting (or skips it if possible) and one + * callback for the "done" interrupt. Each done func calls the next + * set function to propagate the request down to fd_rwsec_done(). + */ + +static void do_fd_action( int drive ) +{ + DPRINT(("do_fd_action\n")); + + if (UseTrackbuffer && !IsFormatting) { + repeat: + if (IS_BUFFERED( drive, ReqSide, ReqTrack )) { + if (ReqCmd == READ) { + copy_buffer( SECTOR_BUFFER(ReqSector), ReqData ); + if (++ReqCnt < blk_rq_cur_sectors(fd_request)) { + /* read next sector */ + setup_req_params( drive ); + goto repeat; + } + else { + /* all sectors finished */ + fd_end_request_cur(BLK_STS_OK); + finish_fdc(); + return; + } + } + else { + /* cmd == WRITE, pay attention to track buffer + * consistency! */ + copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) ); + } + } + } + + if (SelectedDrive != drive) + fd_select_drive( drive ); + + if (UD.track == -1) + fd_calibrate(); + else if (UD.track != ReqTrack << UDT->stretch) + fd_seek(); + else if (IsFormatting) + fd_writetrack(); + else + fd_rwsec(); +} + + +/* Seek to track 0 if the current track is unknown */ + +static void fd_calibrate( void ) +{ + if (SUD.track >= 0) { + fd_calibrate_done( 0 ); + return; + } + + if (ATARIHW_PRESENT(FDCSPEED)) + dma_wd.fdc_speed = 0; /* always seek with 8 Mhz */ + DPRINT(("fd_calibrate\n")); + SET_IRQ_HANDLER( fd_calibrate_done ); + /* we can't verify, since the speed may be incorrect */ + FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate ); + + NeedSeek = 1; + MotorOn = 1; + start_timeout(); + /* wait for IRQ */ +} + + +static void fd_calibrate_done( int status ) +{ + DPRINT(("fd_calibrate_done()\n")); + stop_timeout(); + + /* set the correct speed now */ + if (ATARIHW_PRESENT(FDCSPEED)) + dma_wd.fdc_speed = SUDT->fdc_speed; + if (status & FDCSTAT_RECNF) { + printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive ); + fd_error(); + } + else { + SUD.track = 0; + fd_seek(); + } +} + + +/* Seek the drive to the requested track. The drive must have been + * calibrated at some point before this. + */ + +static void fd_seek( void ) +{ + if (SUD.track == ReqTrack << SUDT->stretch) { + fd_seek_done( 0 ); + return; + } + + if (ATARIHW_PRESENT(FDCSPEED)) { + dma_wd.fdc_speed = 0; /* always seek witch 8 Mhz */ + MFPDELAY(); + } + + DPRINT(("fd_seek() to track %d\n",ReqTrack)); + FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch); + udelay(25); + SET_IRQ_HANDLER( fd_seek_done ); + FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate ); + + MotorOn = 1; + set_head_settle_flag(); + start_timeout(); + /* wait for IRQ */ +} + + +static void fd_seek_done( int status ) +{ + DPRINT(("fd_seek_done()\n")); + stop_timeout(); + + /* set the correct speed */ + if (ATARIHW_PRESENT(FDCSPEED)) + dma_wd.fdc_speed = SUDT->fdc_speed; + if (status & FDCSTAT_RECNF) { + printk(KERN_ERR "fd%d: seek error (to track %d)\n", + SelectedDrive, ReqTrack ); + /* we don't know exactly which track we are on now! */ + SUD.track = -1; + fd_error(); + } + else { + SUD.track = ReqTrack << SUDT->stretch; + NeedSeek = 0; + if (IsFormatting) + fd_writetrack(); + else + fd_rwsec(); + } +} + + +/* This does the actual reading/writing after positioning the head + * over the correct track. + */ + +static int MultReadInProgress = 0; + + +static void fd_rwsec( void ) +{ + unsigned long paddr, flags; + unsigned int rwflag, old_motoron; + unsigned int track; + + DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' )); + if (ReqCmd == WRITE) { + if (ATARIHW_PRESENT(EXTD_DMA)) { + paddr = virt_to_phys(ReqData); + } + else { + copy_buffer( ReqData, DMABuffer ); + paddr = PhysDMABuffer; + } + dma_cache_maintenance( paddr, 512, 1 ); + rwflag = 0x100; + } + else { + if (read_track) + paddr = PhysTrackBuffer; + else + paddr = ATARIHW_PRESENT(EXTD_DMA) ? + virt_to_phys(ReqData) : PhysDMABuffer; + rwflag = 0; + } + + fd_select_side( ReqSide ); + + /* Start sector of this operation */ + FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector ); + MFPDELAY(); + /* Cheat for track if stretch != 0 */ + if (SUDT->stretch) { + track = FDC_READ( FDCREG_TRACK); + MFPDELAY(); + FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch); + } + udelay(25); + + /* Setup DMA */ + local_irq_save(flags); + dma_wd.dma_lo = (unsigned char)paddr; + MFPDELAY(); + paddr >>= 8; + dma_wd.dma_md = (unsigned char)paddr; + MFPDELAY(); + paddr >>= 8; + if (ATARIHW_PRESENT(EXTD_DMA)) + st_dma_ext_dmahi = (unsigned short)paddr; + else + dma_wd.dma_hi = (unsigned char)paddr; + MFPDELAY(); + local_irq_restore(flags); + + /* Clear FIFO and switch DMA to correct mode */ + dma_wd.dma_mode_status = 0x90 | rwflag; + MFPDELAY(); + dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100); + MFPDELAY(); + dma_wd.dma_mode_status = 0x90 | rwflag; + MFPDELAY(); + + /* How many sectors for DMA */ + dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1; + + udelay(25); + + /* Start operation */ + dma_wd.dma_mode_status = FDCSELREG_STP | rwflag; + udelay(25); + SET_IRQ_HANDLER( fd_rwsec_done ); + dma_wd.fdc_acces_seccount = + (get_head_settle_flag() | + (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0)))); + + old_motoron = MotorOn; + MotorOn = 1; + NeedSeek = 1; + /* wait for interrupt */ + + if (read_track) { + /* If reading a whole track, wait about one disk rotation and + * then check if all sectors are read. The FDC will even + * search for the first non-existent sector and need 1 sec to + * recognise that it isn't present :-( + */ + MultReadInProgress = 1; + mod_timer(&readtrack_timer, + /* 1 rot. + 5 rot.s if motor was off */ + jiffies + HZ/5 + (old_motoron ? 0 : HZ)); + } + start_timeout(); +} + + +static void fd_readtrack_check(struct timer_list *unused) +{ + unsigned long flags, addr, addr2; + + local_irq_save(flags); + + if (!MultReadInProgress) { + /* This prevents a race condition that could arise if the + * interrupt is triggered while the calling of this timer + * callback function takes place. The IRQ function then has + * already cleared 'MultReadInProgress' when flow of control + * gets here. + */ + local_irq_restore(flags); + return; + } + + /* get the current DMA address */ + /* ++ f.a. read twice to avoid being fooled by switcher */ + addr = 0; + do { + addr2 = addr; + addr = dma_wd.dma_lo & 0xff; + MFPDELAY(); + addr |= (dma_wd.dma_md & 0xff) << 8; + MFPDELAY(); + if (ATARIHW_PRESENT( EXTD_DMA )) + addr |= (st_dma_ext_dmahi & 0xffff) << 16; + else + addr |= (dma_wd.dma_hi & 0xff) << 16; + MFPDELAY(); + } while(addr != addr2); + + if (addr >= PhysTrackBuffer + SUDT->spt*512) { + /* already read enough data, force an FDC interrupt to stop + * the read operation + */ + SET_IRQ_HANDLER( NULL ); + MultReadInProgress = 0; + local_irq_restore(flags); + DPRINT(("fd_readtrack_check(): done\n")); + FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); + udelay(25); + + /* No error until now -- the FDC would have interrupted + * otherwise! + */ + fd_rwsec_done1(0); + } + else { + /* not yet finished, wait another tenth rotation */ + local_irq_restore(flags); + DPRINT(("fd_readtrack_check(): not yet finished\n")); + mod_timer(&readtrack_timer, jiffies + HZ/5/10); + } +} + + +static void fd_rwsec_done( int status ) +{ + DPRINT(("fd_rwsec_done()\n")); + + if (read_track) { + del_timer(&readtrack_timer); + if (!MultReadInProgress) + return; + MultReadInProgress = 0; + } + fd_rwsec_done1(status); +} + +static void fd_rwsec_done1(int status) +{ + unsigned int track; + + stop_timeout(); + + /* Correct the track if stretch != 0 */ + if (SUDT->stretch) { + track = FDC_READ( FDCREG_TRACK); + MFPDELAY(); + FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch); + } + + if (!UseTrackbuffer) { + dma_wd.dma_mode_status = 0x90; + MFPDELAY(); + if (!(dma_wd.dma_mode_status & 0x01)) { + printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive ); + goto err_end; + } + } + MFPDELAY(); + + if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) { + printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive ); + goto err_end; + } + if ((status & FDCSTAT_RECNF) && + /* RECNF is no error after a multiple read when the FDC + searched for a non-existent sector! */ + !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) { + if (Probing) { + if (SUDT > atari_disk_type) { + if (SUDT[-1].blocks > ReqBlock) { + /* try another disk type */ + SUDT--; + set_capacity(unit[SelectedDrive].disk[0], + SUDT->blocks); + } else + Probing = 0; + } + else { + if (SUD.flags & FTD_MSG) + printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n", + SelectedDrive, SUDT->name ); + Probing=0; + } + } else { +/* record not found, but not probing. Maybe stretch wrong ? Restart probing */ + if (SUD.autoprobe) { + SUDT = atari_disk_type + StartDiskType[DriveType]; + set_capacity(unit[SelectedDrive].disk[0], + SUDT->blocks); + Probing = 1; + } + } + if (Probing) { + if (ATARIHW_PRESENT(FDCSPEED)) { + dma_wd.fdc_speed = SUDT->fdc_speed; + MFPDELAY(); + } + setup_req_params( SelectedDrive ); + BufferDrive = -1; + do_fd_action( SelectedDrive ); + return; + } + + printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n", + SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack ); + goto err_end; + } + if (status & FDCSTAT_CRC) { + printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n", + SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) ); + goto err_end; + } + if (status & FDCSTAT_LOST) { + printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n", + SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) ); + goto err_end; + } + + Probing = 0; + + if (ReqCmd == READ) { + if (!read_track) { + void *addr; + addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer; + dma_cache_maintenance( virt_to_phys(addr), 512, 0 ); + if (!ATARIHW_PRESENT( EXTD_DMA )) + copy_buffer (addr, ReqData); + } else { + dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 ); + BufferDrive = SelectedDrive; + BufferSide = ReqSide; + BufferTrack = ReqTrack; + copy_buffer (SECTOR_BUFFER (ReqSector), ReqData); + } + } + + if (++ReqCnt < blk_rq_cur_sectors(fd_request)) { + /* read next sector */ + setup_req_params( SelectedDrive ); + do_fd_action( SelectedDrive ); + } + else { + /* all sectors finished */ + fd_end_request_cur(BLK_STS_OK); + finish_fdc(); + } + return; + + err_end: + BufferDrive = -1; + fd_error(); +} + + +static void fd_writetrack( void ) +{ + unsigned long paddr, flags; + unsigned int track; + + DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide )); + + paddr = PhysTrackBuffer; + dma_cache_maintenance( paddr, BUFFER_SIZE, 1 ); + + fd_select_side( ReqSide ); + + /* Cheat for track if stretch != 0 */ + if (SUDT->stretch) { + track = FDC_READ( FDCREG_TRACK); + MFPDELAY(); + FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch); + } + udelay(40); + + /* Setup DMA */ + local_irq_save(flags); + dma_wd.dma_lo = (unsigned char)paddr; + MFPDELAY(); + paddr >>= 8; + dma_wd.dma_md = (unsigned char)paddr; + MFPDELAY(); + paddr >>= 8; + if (ATARIHW_PRESENT( EXTD_DMA )) + st_dma_ext_dmahi = (unsigned short)paddr; + else + dma_wd.dma_hi = (unsigned char)paddr; + MFPDELAY(); + local_irq_restore(flags); + + /* Clear FIFO and switch DMA to correct mode */ + dma_wd.dma_mode_status = 0x190; + MFPDELAY(); + dma_wd.dma_mode_status = 0x90; + MFPDELAY(); + dma_wd.dma_mode_status = 0x190; + MFPDELAY(); + + /* How many sectors for DMA */ + dma_wd.fdc_acces_seccount = BUFFER_SIZE/512; + udelay(40); + + /* Start operation */ + dma_wd.dma_mode_status = FDCSELREG_STP | 0x100; + udelay(40); + SET_IRQ_HANDLER( fd_writetrack_done ); + dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag(); + + MotorOn = 1; + start_timeout(); + /* wait for interrupt */ +} + + +static void fd_writetrack_done( int status ) +{ + DPRINT(("fd_writetrack_done()\n")); + + stop_timeout(); + + if (status & FDCSTAT_WPROT) { + printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive ); + goto err_end; + } + if (status & FDCSTAT_LOST) { + printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n", + SelectedDrive, ReqSide, ReqTrack ); + goto err_end; + } + + complete(&format_wait); + return; + + err_end: + fd_error(); +} + +static void fd_times_out(struct timer_list *unused) +{ + atari_disable_irq( IRQ_MFP_FDC ); + if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but + * before we came here... */ + + SET_IRQ_HANDLER( NULL ); + /* If the timeout occurred while the readtrack_check timer was + * active, we need to cancel it, else bad things will happen */ + if (UseTrackbuffer) + del_timer( &readtrack_timer ); + FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); + udelay( 25 ); + + printk(KERN_ERR "floppy timeout\n" ); + fd_error(); + end: + atari_enable_irq( IRQ_MFP_FDC ); +} + + +/* The (noop) seek operation here is needed to make the WP bit in the + * FDC status register accessible for check_change. If the last disk + * operation would have been a RDSEC, this bit would always read as 0 + * no matter what :-( To save time, the seek goes to the track we're + * already on. + */ + +static void finish_fdc( void ) +{ + if (!NeedSeek || !stdma_is_locked_by(floppy_irq)) { + finish_fdc_done( 0 ); + } + else { + DPRINT(("finish_fdc: dummy seek started\n")); + FDC_WRITE (FDCREG_DATA, SUD.track); + SET_IRQ_HANDLER( finish_fdc_done ); + FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK); + MotorOn = 1; + start_timeout(); + /* we must wait for the IRQ here, because the ST-DMA + is released immediately afterwards and the interrupt + may be delivered to the wrong driver. */ + } +} + + +static void finish_fdc_done( int dummy ) +{ + unsigned long flags; + + DPRINT(("finish_fdc_done entered\n")); + stop_timeout(); + NeedSeek = 0; + + if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5)) + /* If the check for a disk change is done too early after this + * last seek command, the WP bit still reads wrong :-(( + */ + mod_timer(&fd_timer, jiffies + 5); + else + start_check_change_timer(); + start_motor_off_timer(); + + local_irq_save(flags); + if (stdma_is_locked_by(floppy_irq)) + stdma_release(); + local_irq_restore(flags); + + DPRINT(("finish_fdc() finished\n")); +} + +/* The detection of disk changes is a dark chapter in Atari history :-( + * Because the "Drive ready" signal isn't present in the Atari + * hardware, one has to rely on the "Write Protect". This works fine, + * as long as no write protected disks are used. TOS solves this + * problem by introducing tri-state logic ("maybe changed") and + * looking at the serial number in block 0. This isn't possible for + * Linux, since the floppy driver can't make assumptions about the + * filesystem used on the disk and thus the contents of block 0. I've + * chosen the method to always say "The disk was changed" if it is + * unsure whether it was. This implies that every open or mount + * invalidates the disk buffers if you work with write protected + * disks. But at least this is better than working with incorrect data + * due to unrecognised disk changes. + */ + +static unsigned int floppy_check_events(struct gendisk *disk, + unsigned int clearing) +{ + struct atari_floppy_struct *p = disk->private_data; + unsigned int drive = p - unit; + if (test_bit (drive, &fake_change)) { + /* simulated change (e.g. after formatting) */ + return DISK_EVENT_MEDIA_CHANGE; + } + if (test_bit (drive, &changed_floppies)) { + /* surely changed (the WP signal changed at least once) */ + return DISK_EVENT_MEDIA_CHANGE; + } + if (UD.wpstat) { + /* WP is on -> could be changed: to be sure, buffers should be + * invalidated... + */ + return DISK_EVENT_MEDIA_CHANGE; + } + + return 0; +} + +static int floppy_revalidate(struct gendisk *disk) +{ + struct atari_floppy_struct *p = disk->private_data; + unsigned int drive = p - unit; + + if (test_bit(drive, &changed_floppies) || + test_bit(drive, &fake_change) || !p->disktype) { + if (UD.flags & FTD_MSG) + printk(KERN_ERR "floppy: clear format %p!\n", UDT); + BufferDrive = -1; + clear_bit(drive, &fake_change); + clear_bit(drive, &changed_floppies); + /* MSch: clearing geometry makes sense only for autoprobe + formats, for 'permanent user-defined' parameter: + restore default_params[] here if flagged valid! */ + if (default_params[drive].blocks == 0) + UDT = NULL; + else + UDT = &default_params[drive]; + } + return 0; +} + + +/* This sets up the global variables describing the current request. */ + +static void setup_req_params( int drive ) +{ + int block = ReqBlock + ReqCnt; + + ReqTrack = block / UDT->spt; + ReqSector = block - ReqTrack * UDT->spt + 1; + ReqSide = ReqTrack & 1; + ReqTrack >>= 1; + ReqData = ReqBuffer + 512 * ReqCnt; + + if (UseTrackbuffer) + read_track = (ReqCmd == READ && unit[drive].error_count == 0); + else + read_track = 0; + + DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide, + ReqTrack, ReqSector, (unsigned long)ReqData )); +} + +static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct atari_floppy_struct *floppy = bd->rq->q->disk->private_data; + int drive = floppy - unit; + int type = floppy->type; + + DPRINT(("Queue request: drive %d type %d sectors %d of %d last %d\n", + drive, type, blk_rq_cur_sectors(bd->rq), + blk_rq_sectors(bd->rq), bd->last)); + + spin_lock_irq(&ataflop_lock); + if (fd_request) { + spin_unlock_irq(&ataflop_lock); + return BLK_STS_DEV_RESOURCE; + } + if (!stdma_try_lock(floppy_irq, NULL)) { + spin_unlock_irq(&ataflop_lock); + return BLK_STS_RESOURCE; + } + fd_request = bd->rq; + unit[drive].error_count = 0; + blk_mq_start_request(fd_request); + + atari_disable_irq( IRQ_MFP_FDC ); + + IsFormatting = 0; + + if (!UD.connected) { + /* drive not connected */ + printk(KERN_ERR "Unknown Device: fd%d\n", drive ); + fd_end_request_cur(BLK_STS_IOERR); + stdma_release(); + goto out; + } + + if (type == 0) { + if (!UDT) { + Probing = 1; + UDT = atari_disk_type + StartDiskType[DriveType]; + set_capacity(bd->rq->q->disk, UDT->blocks); + UD.autoprobe = 1; + } + } + else { + /* user supplied disk type */ + if (--type >= NUM_DISK_MINORS) { + printk(KERN_WARNING "fd%d: invalid disk format", drive ); + fd_end_request_cur(BLK_STS_IOERR); + stdma_release(); + goto out; + } + if (minor2disktype[type].drive_types > DriveType) { + printk(KERN_WARNING "fd%d: unsupported disk format", drive ); + fd_end_request_cur(BLK_STS_IOERR); + stdma_release(); + goto out; + } + type = minor2disktype[type].index; + UDT = &atari_disk_type[type]; + set_capacity(bd->rq->q->disk, UDT->blocks); + UD.autoprobe = 0; + } + + /* stop deselect timer */ + del_timer( &motor_off_timer ); + + ReqCnt = 0; + ReqCmd = rq_data_dir(fd_request); + ReqBlock = blk_rq_pos(fd_request); + ReqBuffer = bio_data(fd_request->bio); + setup_req_params( drive ); + do_fd_action( drive ); + + atari_enable_irq( IRQ_MFP_FDC ); + +out: + spin_unlock_irq(&ataflop_lock); + return BLK_STS_OK; +} + +static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long param) +{ + struct gendisk *disk = bdev->bd_disk; + struct atari_floppy_struct *floppy = disk->private_data; + int drive = floppy - unit; + int type = floppy->type; + struct atari_format_descr fmt_desc; + struct atari_disk_type *dtp; + struct floppy_struct getprm; + int settype; + struct floppy_struct setprm; + void __user *argp = (void __user *)param; + + switch (cmd) { + case FDGETPRM: + if (type) { + if (--type >= NUM_DISK_MINORS) + return -ENODEV; + if (minor2disktype[type].drive_types > DriveType) + return -ENODEV; + type = minor2disktype[type].index; + dtp = &atari_disk_type[type]; + if (UD.flags & FTD_MSG) + printk (KERN_ERR "floppy%d: found dtp %p name %s!\n", + drive, dtp, dtp->name); + } + else { + if (!UDT) + return -ENXIO; + else + dtp = UDT; + } + memset((void *)&getprm, 0, sizeof(getprm)); + getprm.size = dtp->blocks; + getprm.sect = dtp->spt; + getprm.head = 2; + getprm.track = dtp->blocks/dtp->spt/2; + getprm.stretch = dtp->stretch; + if (copy_to_user(argp, &getprm, sizeof(getprm))) + return -EFAULT; + return 0; + } + switch (cmd) { + case FDSETPRM: + case FDDEFPRM: + /* + * MSch 7/96: simple 'set geometry' case: just set the + * 'default' device params (minor == 0). + * Currently, the drive geometry is cleared after each + * disk change and subsequent revalidate()! simple + * implementation of FDDEFPRM: save geometry from a + * FDDEFPRM call and restore it in floppy_revalidate() ! + */ + + /* get the parameters from user space */ + if (floppy->ref != 1 && floppy->ref != -1) + return -EBUSY; + if (copy_from_user(&setprm, argp, sizeof(setprm))) + return -EFAULT; + /* + * first of all: check for floppy change and revalidate, + * or the next access will revalidate - and clear UDT :-( + */ + + if (floppy_check_events(disk, 0)) + floppy_revalidate(disk); + + if (UD.flags & FTD_MSG) + printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n", + drive, setprm.size, setprm.sect, setprm.stretch); + + /* what if type > 0 here? Overwrite specified entry ? */ + if (type) { + /* refuse to re-set a predefined type for now */ + finish_fdc(); + return -EINVAL; + } + + /* + * type == 0: first look for a matching entry in the type list, + * and set the UD.disktype field to use the perdefined entry. + * TODO: add user-defined format to head of autoprobe list ? + * Useful to include the user-type for future autodetection! + */ + + for (settype = 0; settype < NUM_DISK_MINORS; settype++) { + int setidx = 0; + if (minor2disktype[settype].drive_types > DriveType) { + /* skip this one, invalid for drive ... */ + continue; + } + setidx = minor2disktype[settype].index; + dtp = &atari_disk_type[setidx]; + + /* found matching entry ?? */ + if ( dtp->blocks == setprm.size + && dtp->spt == setprm.sect + && dtp->stretch == setprm.stretch ) { + if (UD.flags & FTD_MSG) + printk (KERN_INFO "floppy%d: setting %s %p!\n", + drive, dtp->name, dtp); + UDT = dtp; + set_capacity(disk, UDT->blocks); + + if (cmd == FDDEFPRM) { + /* save settings as permanent default type */ + default_params[drive].name = dtp->name; + default_params[drive].spt = dtp->spt; + default_params[drive].blocks = dtp->blocks; + default_params[drive].fdc_speed = dtp->fdc_speed; + default_params[drive].stretch = dtp->stretch; + } + + return 0; + } + + } + + /* no matching disk type found above - setting user_params */ + + if (cmd == FDDEFPRM) { + /* set permanent type */ + dtp = &default_params[drive]; + } else + /* set user type (reset by disk change!) */ + dtp = &user_params[drive]; + + dtp->name = "user format"; + dtp->blocks = setprm.size; + dtp->spt = setprm.sect; + if (setprm.sect > 14) + dtp->fdc_speed = 3; + else + dtp->fdc_speed = 0; + dtp->stretch = setprm.stretch; + + if (UD.flags & FTD_MSG) + printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n", + drive, dtp->blocks, dtp->spt, dtp->stretch); + + /* sanity check */ + if (setprm.track != dtp->blocks/dtp->spt/2 || + setprm.head != 2) { + finish_fdc(); + return -EINVAL; + } + + UDT = dtp; + set_capacity(disk, UDT->blocks); + + return 0; + case FDMSGON: + UD.flags |= FTD_MSG; + return 0; + case FDMSGOFF: + UD.flags &= ~FTD_MSG; + return 0; + case FDSETEMSGTRESH: + return -EINVAL; + case FDFMTBEG: + return 0; + case FDFMTTRK: + if (floppy->ref != 1 && floppy->ref != -1) + return -EBUSY; + if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc))) + return -EFAULT; + return do_format(drive, type, &fmt_desc); + case FDCLRPRM: + UDT = NULL; + /* MSch: invalidate default_params */ + default_params[drive].blocks = 0; + set_capacity(disk, MAX_DISK_SIZE * 2); + fallthrough; + case FDFMTEND: + case FDFLUSH: + /* invalidate the buffer track to force a reread */ + BufferDrive = -1; + set_bit(drive, &fake_change); + if (disk_check_media_change(disk)) + floppy_revalidate(disk); + return 0; + default: + return -EINVAL; + } +} + +static int fd_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long arg) +{ + int ret; + + mutex_lock(&ataflop_mutex); + ret = fd_locked_ioctl(bdev, mode, cmd, arg); + mutex_unlock(&ataflop_mutex); + + return ret; +} + +/* Initialize the 'unit' variable for drive 'drive' */ + +static void __init fd_probe( int drive ) +{ + UD.connected = 0; + UDT = NULL; + + if (!fd_test_drive_present( drive )) + return; + + UD.connected = 1; + UD.track = 0; + switch( UserSteprate[drive] ) { + case 2: + UD.steprate = FDCSTEP_2; + break; + case 3: + UD.steprate = FDCSTEP_3; + break; + case 6: + UD.steprate = FDCSTEP_6; + break; + case 12: + UD.steprate = FDCSTEP_12; + break; + default: /* should be -1 for "not set by user" */ + if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA) + UD.steprate = FDCSTEP_3; + else + UD.steprate = FDCSTEP_6; + break; + } + MotorOn = 1; /* from probe restore operation! */ +} + + +/* This function tests the physical presence of a floppy drive (not + * whether a disk is inserted). This is done by issuing a restore + * command, waiting max. 2 seconds (that should be enough to move the + * head across the whole disk) and looking at the state of the "TR00" + * signal. This should now be raised if there is a drive connected + * (and there is no hardware failure :-) Otherwise, the drive is + * declared absent. + */ + +static int __init fd_test_drive_present( int drive ) +{ + unsigned long timeout; + unsigned char status; + int ok; + + if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 ); + fd_select_drive( drive ); + + /* disable interrupt temporarily */ + atari_turnoff_irq( IRQ_MFP_FDC ); + FDC_WRITE (FDCREG_TRACK, 0xff00); + FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 ); + + timeout = jiffies + 2*HZ+HZ/2; + while (time_before(jiffies, timeout)) + if (!(st_mfp.par_dt_reg & 0x20)) + break; + + status = FDC_READ( FDCREG_STATUS ); + ok = (status & FDCSTAT_TR00) != 0; + + /* force interrupt to abort restore operation (FDC would try + * about 50 seconds!) */ + FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); + udelay(500); + status = FDC_READ( FDCREG_STATUS ); + udelay(20); + + if (ok) { + /* dummy seek command to make WP bit accessible */ + FDC_WRITE( FDCREG_DATA, 0 ); + FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK ); + while( st_mfp.par_dt_reg & 0x20 ) + ; + status = FDC_READ( FDCREG_STATUS ); + } + + atari_turnon_irq( IRQ_MFP_FDC ); + return( ok ); +} + + +/* Look how many and which kind of drives are connected. If there are + * floppies, additionally start the disk-change and motor-off timers. + */ + +static void __init config_types( void ) +{ + int drive, cnt = 0; + + /* for probing drives, set the FDC speed to 8 MHz */ + if (ATARIHW_PRESENT(FDCSPEED)) + dma_wd.fdc_speed = 0; + + printk(KERN_INFO "Probing floppy drive(s):\n"); + for( drive = 0; drive < FD_MAX_UNITS; drive++ ) { + fd_probe( drive ); + if (UD.connected) { + printk(KERN_INFO "fd%d\n", drive); + ++cnt; + } + } + + if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) { + /* If FDC is still busy from probing, give it another FORCI + * command to abort the operation. If this isn't done, the FDC + * will interrupt later and its IRQ line stays low, because + * the status register isn't read. And this will block any + * interrupts on this IRQ line :-( + */ + FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); + udelay(500); + FDC_READ( FDCREG_STATUS ); + udelay(20); + } + + if (cnt > 0) { + start_motor_off_timer(); + if (cnt == 1) fd_select_drive( 0 ); + start_check_change_timer(); + } +} + +/* + * 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 gendisk *disk, blk_mode_t mode) +{ + struct atari_floppy_struct *p = disk->private_data; + int type = disk->first_minor >> 2; + + DPRINT(("fd_open: type=%d\n",type)); + if (p->ref && p->type != type) + return -EBUSY; + + if (p->ref == -1 || (p->ref && mode & BLK_OPEN_EXCL)) + return -EBUSY; + if (mode & BLK_OPEN_EXCL) + p->ref = -1; + else + p->ref++; + + p->type = type; + + if (mode & BLK_OPEN_NDELAY) + return 0; + + if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) { + if (disk_check_media_change(disk)) + floppy_revalidate(disk); + if (mode & BLK_OPEN_WRITE) { + if (p->wpstat) { + if (p->ref < 0) + p->ref = 0; + else + p->ref--; + return -EROFS; + } + } + } + return 0; +} + +static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode) +{ + int ret; + + mutex_lock(&ataflop_mutex); + ret = floppy_open(disk, mode); + mutex_unlock(&ataflop_mutex); + + return ret; +} + +static void floppy_release(struct gendisk *disk) +{ + struct atari_floppy_struct *p = disk->private_data; + mutex_lock(&ataflop_mutex); + if (p->ref < 0) + p->ref = 0; + else if (!p->ref--) { + printk(KERN_ERR "floppy_release with fd_ref == 0"); + p->ref = 0; + } + mutex_unlock(&ataflop_mutex); +} + +static const struct block_device_operations floppy_fops = { + .owner = THIS_MODULE, + .open = floppy_unlocked_open, + .release = floppy_release, + .ioctl = fd_ioctl, + .check_events = floppy_check_events, +}; + +static const struct blk_mq_ops ataflop_mq_ops = { + .queue_rq = ataflop_queue_rq, +}; + +static int ataflop_alloc_disk(unsigned int drive, unsigned int type) +{ + struct gendisk *disk; + + disk = blk_mq_alloc_disk(&unit[drive].tag_set, NULL); + if (IS_ERR(disk)) + return PTR_ERR(disk); + + disk->major = FLOPPY_MAJOR; + disk->first_minor = drive + (type << 2); + disk->minors = 1; + sprintf(disk->disk_name, "fd%d", drive); + disk->fops = &floppy_fops; + disk->flags |= GENHD_FL_NO_PART; + disk->events = DISK_EVENT_MEDIA_CHANGE; + disk->private_data = &unit[drive]; + set_capacity(disk, MAX_DISK_SIZE * 2); + + unit[drive].disk[type] = disk; + return 0; +} + +static void ataflop_probe(dev_t dev) +{ + int drive = MINOR(dev) & 3; + int type = MINOR(dev) >> 2; + + if (type) + type--; + + if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS) + return; + if (unit[drive].disk[type]) + return; + if (ataflop_alloc_disk(drive, type)) + return; + if (add_disk(unit[drive].disk[type])) + goto cleanup_disk; + unit[drive].registered[type] = true; + return; + +cleanup_disk: + put_disk(unit[drive].disk[type]); + unit[drive].disk[type] = NULL; +} + +static void atari_floppy_cleanup(void) +{ + int i; + int type; + + for (i = 0; i < FD_MAX_UNITS; i++) { + for (type = 0; type < NUM_DISK_MINORS; type++) { + if (!unit[i].disk[type]) + continue; + del_gendisk(unit[i].disk[type]); + put_disk(unit[i].disk[type]); + } + blk_mq_free_tag_set(&unit[i].tag_set); + } + + del_timer_sync(&fd_timer); + atari_stram_free(DMABuffer); +} + +static void atari_cleanup_floppy_disk(struct atari_floppy_struct *fs) +{ + int type; + + for (type = 0; type < NUM_DISK_MINORS; type++) { + if (!fs->disk[type]) + continue; + if (fs->registered[type]) + del_gendisk(fs->disk[type]); + put_disk(fs->disk[type]); + } + blk_mq_free_tag_set(&fs->tag_set); +} + +static int __init atari_floppy_init (void) +{ + int i; + int ret; + + if (!MACH_IS_ATARI) + /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */ + return -ENODEV; + + for (i = 0; i < FD_MAX_UNITS; i++) { + memset(&unit[i].tag_set, 0, sizeof(unit[i].tag_set)); + unit[i].tag_set.ops = &ataflop_mq_ops; + unit[i].tag_set.nr_hw_queues = 1; + unit[i].tag_set.nr_maps = 1; + unit[i].tag_set.queue_depth = 2; + unit[i].tag_set.numa_node = NUMA_NO_NODE; + unit[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE; + ret = blk_mq_alloc_tag_set(&unit[i].tag_set); + if (ret) + goto err; + + ret = ataflop_alloc_disk(i, 0); + if (ret) { + blk_mq_free_tag_set(&unit[i].tag_set); + goto err; + } + } + + if (UseTrackbuffer < 0) + /* not set by user -> use default: for now, we turn + track buffering off for all Medusas, though it + could be used with ones that have a counter + card. But the test is too hard :-( */ + UseTrackbuffer = !MACH_IS_MEDUSA; + + /* initialize variables */ + SelectedDrive = -1; + BufferDrive = -1; + + DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop"); + if (!DMABuffer) { + printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n"); + ret = -ENOMEM; + goto err; + } + TrackBuffer = DMABuffer + 512; + PhysDMABuffer = atari_stram_to_phys(DMABuffer); + PhysTrackBuffer = virt_to_phys(TrackBuffer); + BufferDrive = BufferSide = BufferTrack = -1; + + for (i = 0; i < FD_MAX_UNITS; i++) { + unit[i].track = -1; + unit[i].flags = 0; + ret = add_disk(unit[i].disk[0]); + if (ret) + goto err_out_dma; + unit[i].registered[0] = true; + } + + printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n", + DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E', + UseTrackbuffer ? "" : "no "); + config_types(); + + ret = __register_blkdev(FLOPPY_MAJOR, "fd", ataflop_probe); + if (ret) { + printk(KERN_ERR "atari_floppy_init: cannot register block device\n"); + atari_floppy_cleanup(); + } + return ret; + +err_out_dma: + atari_stram_free(DMABuffer); +err: + while (--i >= 0) + atari_cleanup_floppy_disk(&unit[i]); + + return ret; +} + +#ifndef MODULE +static int __init atari_floppy_setup(char *str) +{ + int ints[3 + FD_MAX_UNITS]; + int i; + + if (!MACH_IS_ATARI) + return 0; + + str = get_options(str, 3 + FD_MAX_UNITS, ints); + + if (ints[0] < 1) { + printk(KERN_ERR "ataflop_setup: no arguments!\n" ); + return 0; + } + else if (ints[0] > 2+FD_MAX_UNITS) { + printk(KERN_ERR "ataflop_setup: too many arguments\n" ); + } + + if (ints[1] < 0 || ints[1] > 2) + printk(KERN_ERR "ataflop_setup: bad drive type\n" ); + else + DriveType = ints[1]; + + if (ints[0] >= 2) + UseTrackbuffer = (ints[2] > 0); + + for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) { + if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12) + printk(KERN_ERR "ataflop_setup: bad steprate\n" ); + else + UserSteprate[i-3] = ints[i]; + } + return 1; +} + +__setup("floppy=", atari_floppy_setup); +#endif + +static void __exit atari_floppy_exit(void) +{ + unregister_blkdev(FLOPPY_MAJOR, "fd"); + atari_floppy_cleanup(); +} + +module_init(atari_floppy_init) +module_exit(atari_floppy_exit) + +MODULE_LICENSE("GPL"); |