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    SubjectRe: [PATCH 3/6] m68k: mac - Add SWIM floppy support
    On Wed, Mar 25 2009, Geert Uytterhoeven wrote:
    > Hi Jens,
    >
    > Is this OK for you to go in through the m68k tree?

    Sure!

    >
    > Thanks!
    >
    > On Sun, Mar 1, 2009 at 10:21, Geert Uytterhoeven <geert@linux-m68k.org> wrote:
    > > From: Laurent Vivier <laurent@lvivier.info>
    > >
    > > It allows to read data from a floppy, but not to write to, and to eject the
    > > floppy (useful on our Mac without eject button).
    > >
    > > Signed-off-by: Laurent Vivier <Laurent@lvivier.info>
    > > Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
    > > Cc: Jens Axboe <axboe@kernel.dk>
    > > ---
    > >  arch/m68k/mac/config.c   |   44 ++
    > >  arch/m68k/mac/via.c      |    9 +
    > >  drivers/block/Kconfig    |    7 +
    > >  drivers/block/Makefile   |    3 +
    > >  drivers/block/swim.c     |  995 ++++++++++++++++++++++++++++++++++++++++++++++
    > >  drivers/block/swim_asm.S |  247 ++++++++++++
    > >  6 files changed, 1305 insertions(+), 0 deletions(-)
    > >  create mode 100644 drivers/block/swim.c
    > >  create mode 100644 drivers/block/swim_asm.S
    > >
    > > diff --git a/arch/m68k/mac/config.c b/arch/m68k/mac/config.c
    > > index 3a1c0b2..be01798 100644
    > > --- a/arch/m68k/mac/config.c
    > > +++ b/arch/m68k/mac/config.c
    > > @@ -22,6 +22,7 @@
    > >  /* keyb */
    > >  #include <linux/init.h>
    > >  #include <linux/vt_kern.h>
    > > +#include <linux/platform_device.h>
    > >
    > >  #define BOOTINFO_COMPAT_1_0
    > >  #include <asm/setup.h>
    > > @@ -43,6 +44,10 @@
    > >  #include <asm/mac_oss.h>
    > >  #include <asm/mac_psc.h>
    > >
    > > +/* platform device info */
    > > +
    > > +#define SWIM_IO_SIZE 0x2000    /* SWIM IO resource size */
    > > +
    > >  /* Mac bootinfo struct */
    > >
    > >  struct mac_booter_data mac_bi_data;
    > > @@ -870,3 +875,42 @@ static void mac_get_model(char *str)
    > >        strcpy(str, "Macintosh ");
    > >        strcat(str, macintosh_config->name);
    > >  }
    > > +
    > > +static struct resource swim_resources[1];
    > > +
    > > +static struct platform_device swim_device = {
    > > +       .name           = "swim",
    > > +       .id             = -1,
    > > +       .num_resources  = ARRAY_SIZE(swim_resources),
    > > +       .resource       = swim_resources,
    > > +};
    > > +
    > > +static struct platform_device *mac_platform_devices[] __initdata = {
    > > +       &swim_device
    > > +};
    > > +
    > > +int __init mac_platform_init(void)
    > > +{
    > > +       u8 *swim_base;
    > > +
    > > +       switch (macintosh_config->floppy_type) {
    > > +       case MAC_FLOPPY_SWIM_ADDR1:
    > > +               swim_base = (u8 *)(VIA1_BASE + 0x1E000);
    > > +               break;
    > > +       case MAC_FLOPPY_SWIM_ADDR2:
    > > +               swim_base = (u8 *)(VIA1_BASE + 0x16000);
    > > +               break;
    > > +       default:
    > > +               return 0;
    > > +       }
    > > +
    > > +       swim_resources[0].name = "swim-regs";
    > > +       swim_resources[0].start = (resource_size_t)swim_base;
    > > +       swim_resources[0].end = (resource_size_t)(swim_base + SWIM_IO_SIZE);
    > > +       swim_resources[0].flags = IORESOURCE_MEM;
    > > +
    > > +       return platform_add_devices(mac_platform_devices,
    > > +                                   ARRAY_SIZE(mac_platform_devices));
    > > +}
    > > +
    > > +arch_initcall(mac_platform_init);
    > > diff --git a/arch/m68k/mac/via.c b/arch/m68k/mac/via.c
    > > index 7d97ba5..11bce3c 100644
    > > --- a/arch/m68k/mac/via.c
    > > +++ b/arch/m68k/mac/via.c
    > > @@ -645,3 +645,12 @@ int via_irq_pending(int irq)
    > >        }
    > >        return 0;
    > >  }
    > > +
    > > +void via1_set_head(int head)
    > > +{
    > > +       if (head == 0)
    > > +               via1[vBufA] &= ~VIA1A_vHeadSel;
    > > +       else
    > > +               via1[vBufA] |= VIA1A_vHeadSel;
    > > +}
    > > +EXPORT_SYMBOL(via1_set_head);
    > > diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
    > > index 0344a8a..e7b8aa0 100644
    > > --- a/drivers/block/Kconfig
    > > +++ b/drivers/block/Kconfig
    > > @@ -45,6 +45,13 @@ config MAC_FLOPPY
    > >          If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
    > >          floppy controller, say Y here. Most commonly found in PowerMacs.
    > >
    > > +config BLK_DEV_SWIM
    > > +       tristate "Support for SWIM Macintosh floppy"
    > > +       depends on M68K && MAC
    > > +       help
    > > +         You should select this option if you want floppy support
    > > +         and you don't have a II, IIfx, Q900, Q950 or AV series.
    > > +
    > >  config AMIGA_Z2RAM
    > >        tristate "Amiga Zorro II ramdisk support"
    > >        depends on ZORRO
    > > diff --git a/drivers/block/Makefile b/drivers/block/Makefile
    > > index 204332b..b32b7f9 100644
    > > --- a/drivers/block/Makefile
    > > +++ b/drivers/block/Makefile
    > > @@ -6,6 +6,7 @@
    > >  #
    > >
    > >  obj-$(CONFIG_MAC_FLOPPY)       += swim3.o
    > > +obj-$(CONFIG_BLK_DEV_SWIM)     += swim_mod.o
    > >  obj-$(CONFIG_BLK_DEV_FD)       += floppy.o
    > >  obj-$(CONFIG_AMIGA_FLOPPY)     += amiflop.o
    > >  obj-$(CONFIG_PS3_DISK)         += ps3disk.o
    > > @@ -32,3 +33,5 @@ obj-$(CONFIG_BLK_DEV_UB)      += ub.o
    > >  obj-$(CONFIG_BLK_DEV_HD)       += hd.o
    > >
    > >  obj-$(CONFIG_XEN_BLKDEV_FRONTEND)      += xen-blkfront.o
    > > +
    > > +swim_mod-objs  := swim.o swim_asm.o
    > > diff --git a/drivers/block/swim.c b/drivers/block/swim.c
    > > new file mode 100644
    > > index 0000000..d22cc38
    > > --- /dev/null
    > > +++ b/drivers/block/swim.c
    > > @@ -0,0 +1,995 @@
    > > +/*
    > > + * Driver for SWIM (Sander Woz Integrated Machine) floppy controller
    > > + *
    > > + * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
    > > + *
    > > + * based on Alastair Bridgewater SWIM analysis, 2001
    > > + * based on SWIM3 driver (c) Paul Mackerras, 1996
    > > + * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
    > > + *
    > > + * This program is free software; you can redistribute it and/or
    > > + * modify it under the terms of the GNU General Public License
    > > + * as published by the Free Software Foundation; either version
    > > + * 2 of the License, or (at your option) any later version.
    > > + *
    > > + * 2004-08-21 (lv) - Initial implementation
    > > + * 2008-10-30 (lv) - Port to 2.6
    > > + */
    > > +
    > > +#include <linux/module.h>
    > > +#include <linux/fd.h>
    > > +#include <linux/blkdev.h>
    > > +#include <linux/hdreg.h>
    > > +#include <linux/kernel.h>
    > > +#include <linux/delay.h>
    > > +#include <linux/platform_device.h>
    > > +
    > > +#include <asm/macintosh.h>
    > > +#include <asm/mac_via.h>
    > > +
    > > +#define CARDNAME "swim"
    > > +
    > > +struct sector_header {
    > > +       unsigned char side;
    > > +       unsigned char track;
    > > +       unsigned char sector;
    > > +       unsigned char size;
    > > +       unsigned char crc0;
    > > +       unsigned char crc1;
    > > +} __attribute__((packed));
    > > +
    > > +#define DRIVER_VERSION "Version 0.2 (2008-10-30)"
    > > +
    > > +#define REG(x) unsigned char x, x ## _pad[0x200 - 1];
    > > +
    > > +struct swim {
    > > +       REG(write_data)
    > > +       REG(write_mark)
    > > +       REG(write_CRC)
    > > +       REG(write_parameter)
    > > +       REG(write_phase)
    > > +       REG(write_setup)
    > > +       REG(write_mode0)
    > > +       REG(write_mode1)
    > > +
    > > +       REG(read_data)
    > > +       REG(read_mark)
    > > +       REG(read_error)
    > > +       REG(read_parameter)
    > > +       REG(read_phase)
    > > +       REG(read_setup)
    > > +       REG(read_status)
    > > +       REG(read_handshake)
    > > +} __attribute__((packed));
    > > +
    > > +#define swim_write(base, reg, v)       out_8(&(base)->write_##reg, (v))
    > > +#define swim_read(base, reg)           in_8(&(base)->read_##reg)
    > > +
    > > +/* IWM registers */
    > > +
    > > +struct iwm {
    > > +       REG(ph0L)
    > > +       REG(ph0H)
    > > +       REG(ph1L)
    > > +       REG(ph1H)
    > > +       REG(ph2L)
    > > +       REG(ph2H)
    > > +       REG(ph3L)
    > > +       REG(ph3H)
    > > +       REG(mtrOff)
    > > +       REG(mtrOn)
    > > +       REG(intDrive)
    > > +       REG(extDrive)
    > > +       REG(q6L)
    > > +       REG(q6H)
    > > +       REG(q7L)
    > > +       REG(q7H)
    > > +} __attribute__((packed));
    > > +
    > > +#define iwm_write(base, reg, v)        out_8(&(base)->reg, (v))
    > > +#define iwm_read(base, reg)            in_8(&(base)->reg)
    > > +
    > > +/* bits in phase register */
    > > +
    > > +#define SEEK_POSITIVE  0x070
    > > +#define SEEK_NEGATIVE  0x074
    > > +#define STEP           0x071
    > > +#define MOTOR_ON       0x072
    > > +#define MOTOR_OFF      0x076
    > > +#define INDEX          0x073
    > > +#define EJECT          0x077
    > > +#define SETMFM         0x171
    > > +#define SETGCR         0x175
    > > +
    > > +#define RELAX          0x033
    > > +#define LSTRB          0x008
    > > +
    > > +#define CA_MASK                0x077
    > > +
    > > +/* Select values for swim_select and swim_readbit */
    > > +
    > > +#define READ_DATA_0    0x074
    > > +#define TWOMEG_DRIVE   0x075
    > > +#define SINGLE_SIDED   0x076
    > > +#define DRIVE_PRESENT  0x077
    > > +#define DISK_IN                0x170
    > > +#define WRITE_PROT     0x171
    > > +#define TRACK_ZERO     0x172
    > > +#define TACHO          0x173
    > > +#define READ_DATA_1    0x174
    > > +#define MFM_MODE       0x175
    > > +#define SEEK_COMPLETE  0x176
    > > +#define ONEMEG_MEDIA   0x177
    > > +
    > > +/* Bits in handshake register */
    > > +
    > > +#define MARK_BYTE      0x01
    > > +#define CRC_ZERO       0x02
    > > +#define RDDATA         0x04
    > > +#define SENSE          0x08
    > > +#define MOTEN          0x10
    > > +#define ERROR          0x20
    > > +#define DAT2BYTE       0x40
    > > +#define DAT1BYTE       0x80
    > > +
    > > +/* bits in setup register */
    > > +
    > > +#define S_INV_WDATA    0x01
    > > +#define S_3_5_SELECT   0x02
    > > +#define S_GCR          0x04
    > > +#define S_FCLK_DIV2    0x08
    > > +#define S_ERROR_CORR   0x10
    > > +#define S_IBM_DRIVE    0x20
    > > +#define S_GCR_WRITE    0x40
    > > +#define S_TIMEOUT      0x80
    > > +
    > > +/* bits in mode register */
    > > +
    > > +#define CLFIFO         0x01
    > > +#define ENBL1          0x02
    > > +#define ENBL2          0x04
    > > +#define ACTION         0x08
    > > +#define WRITE_MODE     0x10
    > > +#define HEDSEL         0x20
    > > +#define MOTON          0x80
    > > +
    > > +/*----------------------------------------------------------------------------*/
    > > +
    > > +enum drive_location {
    > > +       INTERNAL_DRIVE = 0x02,
    > > +       EXTERNAL_DRIVE = 0x04,
    > > +};
    > > +
    > > +enum media_type {
    > > +       DD_MEDIA,
    > > +       HD_MEDIA,
    > > +};
    > > +
    > > +struct floppy_state {
    > > +
    > > +       /* physical properties */
    > > +
    > > +       enum drive_location location;   /* internal or external drive */
    > > +       int              head_number;   /* single- or double-sided drive */
    > > +
    > > +       /* media */
    > > +
    > > +       int              disk_in;
    > > +       int              ejected;
    > > +       enum media_type  type;
    > > +       int              write_protected;
    > > +
    > > +       int              total_secs;
    > > +       int              secpercyl;
    > > +       int              secpertrack;
    > > +
    > > +       /* in-use information */
    > > +
    > > +       int             track;
    > > +       int             ref_count;
    > > +
    > > +       struct gendisk *disk;
    > > +
    > > +       /* parent controller */
    > > +
    > > +       struct swim_priv *swd;
    > > +};
    > > +
    > > +enum motor_action {
    > > +       OFF,
    > > +       ON,
    > > +};
    > > +
    > > +enum head {
    > > +       LOWER_HEAD = 0,
    > > +       UPPER_HEAD = 1,
    > > +};
    > > +
    > > +#define FD_MAX_UNIT    2
    > > +
    > > +struct swim_priv {
    > > +       struct swim __iomem *base;
    > > +       spinlock_t lock;
    > > +       struct request_queue *queue;
    > > +       int floppy_count;
    > > +       struct floppy_state unit[FD_MAX_UNIT];
    > > +};
    > > +
    > > +extern int swim_read_sector_header(struct swim __iomem *base,
    > > +                                  struct sector_header *header);
    > > +extern int swim_read_sector_data(struct swim __iomem *base,
    > > +                                unsigned char *data);
    > > +
    > > +static inline void set_swim_mode(struct swim __iomem *base, int enable)
    > > +{
    > > +       struct iwm __iomem *iwm_base;
    > > +       unsigned long flags;
    > > +
    > > +       if (!enable) {
    > > +               swim_write(base, mode0, 0xf8);
    > > +               return;
    > > +       }
    > > +
    > > +       iwm_base = (struct iwm __iomem *)base;
    > > +       local_irq_save(flags);
    > > +
    > > +       iwm_read(iwm_base, q7L);
    > > +       iwm_read(iwm_base, mtrOff);
    > > +       iwm_read(iwm_base, q6H);
    > > +
    > > +       iwm_write(iwm_base, q7H, 0x57);
    > > +       iwm_write(iwm_base, q7H, 0x17);
    > > +       iwm_write(iwm_base, q7H, 0x57);
    > > +       iwm_write(iwm_base, q7H, 0x57);
    > > +
    > > +       local_irq_restore(flags);
    > > +}
    > > +
    > > +static inline int get_swim_mode(struct swim __iomem *base)
    > > +{
    > > +       unsigned long flags;
    > > +
    > > +       local_irq_save(flags);
    > > +
    > > +       swim_write(base, phase, 0xf5);
    > > +       if (swim_read(base, phase) != 0xf5)
    > > +               goto is_iwm;
    > > +       swim_write(base, phase, 0xf6);
    > > +       if (swim_read(base, phase) != 0xf6)
    > > +               goto is_iwm;
    > > +       swim_write(base, phase, 0xf7);
    > > +       if (swim_read(base, phase) != 0xf7)
    > > +               goto is_iwm;
    > > +       local_irq_restore(flags);
    > > +       return 1;
    > > +is_iwm:
    > > +       local_irq_restore(flags);
    > > +       return 0;
    > > +}
    > > +
    > > +static inline void swim_select(struct swim __iomem *base, int sel)
    > > +{
    > > +       swim_write(base, phase, RELAX);
    > > +
    > > +       via1_set_head(sel & 0x100);
    > > +
    > > +       swim_write(base, phase, sel & CA_MASK);
    > > +}
    > > +
    > > +static inline void swim_action(struct swim __iomem *base, int action)
    > > +{
    > > +       unsigned long flags;
    > > +
    > > +       local_irq_save(flags);
    > > +
    > > +       swim_select(base, action);
    > > +       udelay(1);
    > > +       swim_write(base, phase, (LSTRB<<4) | LSTRB);
    > > +       udelay(1);
    > > +       swim_write(base, phase, (LSTRB<<4) | ((~LSTRB) & 0x0F));
    > > +       udelay(1);
    > > +
    > > +       local_irq_restore(flags);
    > > +}
    > > +
    > > +static inline int swim_readbit(struct swim __iomem *base, int bit)
    > > +{
    > > +       int stat;
    > > +
    > > +       swim_select(base, bit);
    > > +
    > > +       udelay(10);
    > > +
    > > +       stat = swim_read(base, handshake);
    > > +
    > > +       return (stat & SENSE) == 0;
    > > +}
    > > +
    > > +static inline void swim_drive(struct swim __iomem *base,
    > > +                             enum drive_location location)
    > > +{
    > > +       if (location == INTERNAL_DRIVE) {
    > > +               swim_write(base, mode0, EXTERNAL_DRIVE); /* clear drive 1 bit */
    > > +               swim_write(base, mode1, INTERNAL_DRIVE); /* set drive 0 bit */
    > > +       } else if (location == EXTERNAL_DRIVE) {
    > > +               swim_write(base, mode0, INTERNAL_DRIVE); /* clear drive 0 bit */
    > > +               swim_write(base, mode1, EXTERNAL_DRIVE); /* set drive 1 bit */
    > > +       }
    > > +}
    > > +
    > > +static inline void swim_motor(struct swim __iomem *base,
    > > +                             enum motor_action action)
    > > +{
    > > +       if (action == ON) {
    > > +               int i;
    > > +
    > > +               swim_action(base, MOTOR_ON);
    > > +
    > > +               for (i = 0; i < 2*HZ; i++) {
    > > +                       swim_select(base, RELAX);
    > > +                       if (swim_readbit(base, MOTOR_ON))
    > > +                               break;
    > > +                       current->state = TASK_INTERRUPTIBLE;
    > > +                       schedule_timeout(1);
    > > +               }
    > > +       } else if (action == OFF) {
    > > +               swim_action(base, MOTOR_OFF);
    > > +               swim_select(base, RELAX);
    > > +       }
    > > +}
    > > +
    > > +static inline void swim_eject(struct swim __iomem *base)
    > > +{
    > > +       int i;
    > > +
    > > +       swim_action(base, EJECT);
    > > +
    > > +       for (i = 0; i < 2*HZ; i++) {
    > > +               swim_select(base, RELAX);
    > > +               if (!swim_readbit(base, DISK_IN))
    > > +                       break;
    > > +               current->state = TASK_INTERRUPTIBLE;
    > > +               schedule_timeout(1);
    > > +       }
    > > +       swim_select(base, RELAX);
    > > +}
    > > +
    > > +static inline void swim_head(struct swim __iomem *base, enum head head)
    > > +{
    > > +       /* wait drive is ready */
    > > +
    > > +       if (head == UPPER_HEAD)
    > > +               swim_select(base, READ_DATA_1);
    > > +       else if (head == LOWER_HEAD)
    > > +               swim_select(base, READ_DATA_0);
    > > +}
    > > +
    > > +static inline int swim_step(struct swim __iomem *base)
    > > +{
    > > +       int wait;
    > > +
    > > +       swim_action(base, STEP);
    > > +
    > > +       for (wait = 0; wait < HZ; wait++) {
    > > +
    > > +               current->state = TASK_INTERRUPTIBLE;
    > > +               schedule_timeout(1);
    > > +
    > > +               swim_select(base, RELAX);
    > > +               if (!swim_readbit(base, STEP))
    > > +                       return 0;
    > > +       }
    > > +       return -1;
    > > +}
    > > +
    > > +static inline int swim_track00(struct swim __iomem *base)
    > > +{
    > > +       int try;
    > > +
    > > +       swim_action(base, SEEK_NEGATIVE);
    > > +
    > > +       for (try = 0; try < 100; try++) {
    > > +
    > > +               swim_select(base, RELAX);
    > > +               if (swim_readbit(base, TRACK_ZERO))
    > > +                       break;
    > > +
    > > +               if (swim_step(base))
    > > +                       return -1;
    > > +       }
    > > +
    > > +       if (swim_readbit(base, TRACK_ZERO))
    > > +               return 0;
    > > +
    > > +       return -1;
    > > +}
    > > +
    > > +static inline int swim_seek(struct swim __iomem *base, int step)
    > > +{
    > > +       if (step == 0)
    > > +               return 0;
    > > +
    > > +       if (step < 0) {
    > > +               swim_action(base, SEEK_NEGATIVE);
    > > +               step = -step;
    > > +       } else
    > > +               swim_action(base, SEEK_POSITIVE);
    > > +
    > > +       for ( ; step > 0; step--) {
    > > +               if (swim_step(base))
    > > +                       return -1;
    > > +       }
    > > +
    > > +       return 0;
    > > +}
    > > +
    > > +static inline int swim_track(struct floppy_state *fs,  int track)
    > > +{
    > > +       struct swim __iomem *base = fs->swd->base;
    > > +       int ret;
    > > +
    > > +       ret = swim_seek(base, track - fs->track);
    > > +
    > > +       if (ret == 0)
    > > +               fs->track = track;
    > > +       else {
    > > +               swim_track00(base);
    > > +               fs->track = 0;
    > > +       }
    > > +
    > > +       return ret;
    > > +}
    > > +
    > > +static int floppy_eject(struct floppy_state *fs)
    > > +{
    > > +       struct swim __iomem *base = fs->swd->base;
    > > +
    > > +       swim_drive(base, fs->location);
    > > +       swim_motor(base, OFF);
    > > +       swim_eject(base);
    > > +
    > > +       fs->disk_in = 0;
    > > +       fs->ejected = 1;
    > > +
    > > +       return 0;
    > > +}
    > > +
    > > +static inline int swim_read_sector(struct floppy_state *fs,
    > > +                                  int side, int track,
    > > +                                  int sector, unsigned char *buffer)
    > > +{
    > > +       struct swim __iomem *base = fs->swd->base;
    > > +       unsigned long flags;
    > > +       struct sector_header header;
    > > +       int ret = -1;
    > > +       short i;
    > > +
    > > +       swim_track(fs, track);
    > > +
    > > +       swim_write(base, mode1, MOTON);
    > > +       swim_head(base, side);
    > > +       swim_write(base, mode0, side);
    > > +
    > > +       local_irq_save(flags);
    > > +       for (i = 0; i < 36; i++) {
    > > +               ret = swim_read_sector_header(base, &header);
    > > +               if (!ret && (header.sector == sector)) {
    > > +                       /* found */
    > > +
    > > +                       ret = swim_read_sector_data(base, buffer);
    > > +                       break;
    > > +               }
    > > +       }
    > > +       local_irq_restore(flags);
    > > +
    > > +       swim_write(base, mode0, MOTON);
    > > +
    > > +       if ((header.side != side)  || (header.track != track) ||
    > > +            (header.sector != sector))
    > > +               return 0;
    > > +
    > > +       return ret;
    > > +}
    > > +
    > > +static int floppy_read_sectors(struct floppy_state *fs,
    > > +                              int req_sector, int sectors_nb,
    > > +                              unsigned char *buffer)
    > > +{
    > > +       struct swim __iomem *base = fs->swd->base;
    > > +       int ret;
    > > +       int side, track, sector;
    > > +       int i, try;
    > > +
    > > +
    > > +       swim_drive(base, fs->location);
    > > +       for (i = req_sector; i < req_sector + sectors_nb; i++) {
    > > +               int x;
    > > +               track = i / fs->secpercyl;
    > > +               x = i % fs->secpercyl;
    > > +               side = x / fs->secpertrack;
    > > +               sector = x % fs->secpertrack + 1;
    > > +
    > > +               try = 5;
    > > +               do {
    > > +                       ret = swim_read_sector(fs, side, track, sector,
    > > +                                               buffer);
    > > +                       if (try-- == 0)
    > > +                               return -1;
    > > +               } while (ret != 512);
    > > +
    > > +               buffer += ret;
    > > +       }
    > > +
    > > +       return 0;
    > > +}
    > > +
    > > +static void redo_fd_request(struct request_queue *q)
    > > +{
    > > +       struct request *req;
    > > +       struct floppy_state *fs;
    > > +
    > > +       while ((req = elv_next_request(q))) {
    > > +
    > > +               fs = req->rq_disk->private_data;
    > > +               if (req->sector < 0 || req->sector >= fs->total_secs) {
    > > +                       end_request(req, 0);
    > > +                       continue;
    > > +               }
    > > +               if (req->current_nr_sectors == 0) {
    > > +                       end_request(req, 1);
    > > +                       continue;
    > > +               }
    > > +               if (!fs->disk_in) {
    > > +                       end_request(req, 0);
    > > +                       continue;
    > > +               }
    > > +               if (rq_data_dir(req) == WRITE) {
    > > +                       if (fs->write_protected) {
    > > +                               end_request(req, 0);
    > > +                               continue;
    > > +                       }
    > > +               }
    > > +               switch (rq_data_dir(req)) {
    > > +               case WRITE:
    > > +                       /* NOT IMPLEMENTED */
    > > +                       end_request(req, 0);
    > > +                       break;
    > > +               case READ:
    > > +                       if (floppy_read_sectors(fs, req->sector,
    > > +                                               req->current_nr_sectors,
    > > +                                               req->buffer)) {
    > > +                               end_request(req, 0);
    > > +                               continue;
    > > +                       }
    > > +                       req->nr_sectors -= req->current_nr_sectors;
    > > +                       req->sector += req->current_nr_sectors;
    > > +                       req->buffer += req->current_nr_sectors * 512;
    > > +                       end_request(req, 1);
    > > +                       break;
    > > +               }
    > > +       }
    > > +}
    > > +
    > > +static void do_fd_request(struct request_queue *q)
    > > +{
    > > +       redo_fd_request(q);
    > > +}
    > > +
    > > +static struct floppy_struct floppy_type[4] = {
    > > +       {    0,  0, 0,  0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing   */
    > > +       {  720,  9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
    > > +       { 1440,  9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5"   */
    > > +       { 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5"  */
    > > +};
    > > +
    > > +static int get_floppy_geometry(struct floppy_state *fs, int type,
    > > +                              struct floppy_struct **g)
    > > +{
    > > +       if (type >= ARRAY_SIZE(floppy_type))
    > > +               return -EINVAL;
    > > +
    > > +       if (type)
    > > +               *g = &floppy_type[type];
    > > +       else if (fs->type == HD_MEDIA) /* High-Density media */
    > > +               *g = &floppy_type[3];
    > > +       else if (fs->head_number == 2) /* double-sided */
    > > +               *g = &floppy_type[2];
    > > +       else
    > > +               *g = &floppy_type[1];
    > > +
    > > +       return 0;
    > > +}
    > > +
    > > +static void setup_medium(struct floppy_state *fs)
    > > +{
    > > +       struct swim __iomem *base = fs->swd->base;
    > > +
    > > +       if (swim_readbit(base, DISK_IN)) {
    > > +               struct floppy_struct *g;
    > > +               fs->disk_in = 1;
    > > +               fs->write_protected = swim_readbit(base, WRITE_PROT);
    > > +               fs->type = swim_readbit(base, ONEMEG_MEDIA);
    > > +
    > > +               if (swim_track00(base))
    > > +                       printk(KERN_ERR
    > > +                               "SWIM: cannot move floppy head to track 0\n");
    > > +
    > > +               swim_track00(base);
    > > +
    > > +               get_floppy_geometry(fs, 0, &g);
    > > +               fs->total_secs = g->size;
    > > +               fs->secpercyl = g->head * g->sect;
    > > +               fs->secpertrack = g->sect;
    > > +               fs->track = 0;
    > > +       } else {
    > > +               fs->disk_in = 0;
    > > +       }
    > > +}
    > > +
    > > +static int floppy_open(struct block_device *bdev, fmode_t mode)
    > > +{
    > > +       struct floppy_state *fs = bdev->bd_disk->private_data;
    > > +       struct swim __iomem *base = fs->swd->base;
    > > +       int err;
    > > +
    > > +       if (fs->ref_count == -1 || (fs->ref_count && mode & FMODE_EXCL))
    > > +               return -EBUSY;
    > > +
    > > +       if (mode & FMODE_EXCL)
    > > +               fs->ref_count = -1;
    > > +       else
    > > +               fs->ref_count++;
    > > +
    > > +       swim_write(base, setup, S_IBM_DRIVE  | S_FCLK_DIV2);
    > > +       udelay(10);
    > > +       swim_drive(base, INTERNAL_DRIVE);
    > > +       swim_motor(base, ON);
    > > +       swim_action(base, SETMFM);
    > > +       if (fs->ejected)
    > > +               setup_medium(fs);
    > > +       if (!fs->disk_in) {
    > > +               err = -ENXIO;
    > > +               goto out;
    > > +       }
    > > +
    > > +       if (mode & FMODE_NDELAY)
    > > +               return 0;
    > > +
    > > +       if (mode & (FMODE_READ|FMODE_WRITE)) {
    > > +               check_disk_change(bdev);
    > > +               if ((mode & FMODE_WRITE) && fs->write_protected) {
    > > +                       err = -EROFS;
    > > +                       goto out;
    > > +               }
    > > +       }
    > > +       return 0;
    > > +out:
    > > +       if (fs->ref_count < 0)
    > > +               fs->ref_count = 0;
    > > +       else if (fs->ref_count > 0)
    > > +               --fs->ref_count;
    > > +
    > > +       if (fs->ref_count == 0)
    > > +               swim_motor(base, OFF);
    > > +       return err;
    > > +}
    > > +
    > > +static int floppy_release(struct gendisk *disk, fmode_t mode)
    > > +{
    > > +       struct floppy_state *fs = disk->private_data;
    > > +       struct swim __iomem *base = fs->swd->base;
    > > +
    > > +       if (fs->ref_count < 0)
    > > +               fs->ref_count = 0;
    > > +       else if (fs->ref_count > 0)
    > > +               --fs->ref_count;
    > > +
    > > +       if (fs->ref_count == 0)
    > > +               swim_motor(base, OFF);
    > > +
    > > +       return 0;
    > > +}
    > > +
    > > +static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
    > > +                       unsigned int cmd, unsigned long param)
    > > +{
    > > +       struct floppy_state *fs = bdev->bd_disk->private_data;
    > > +       int err;
    > > +
    > > +       if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
    > > +                       return -EPERM;
    > > +
    > > +       switch (cmd) {
    > > +       case FDEJECT:
    > > +               if (fs->ref_count != 1)
    > > +                       return -EBUSY;
    > > +               err = floppy_eject(fs);
    > > +               return err;
    > > +
    > > +       case FDGETPRM:
    > > +               if (copy_to_user((void __user *) param, (void *) &floppy_type,
    > > +                                sizeof(struct floppy_struct)))
    > > +                       return -EFAULT;
    > > +               break;
    > > +
    > > +       default:
    > > +               printk(KERN_DEBUG "SWIM floppy_ioctl: unknown cmd %d\n",
    > > +                      cmd);
    > > +               return -ENOSYS;
    > > +       }
    > > +       return 0;
    > > +}
    > > +
    > > +static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
    > > +{
    > > +       struct floppy_state *fs = bdev->bd_disk->private_data;
    > > +       struct floppy_struct *g;
    > > +       int ret;
    > > +
    > > +       ret = get_floppy_geometry(fs, 0, &g);
    > > +       if (ret)
    > > +               return ret;
    > > +
    > > +       geo->heads = g->head;
    > > +       geo->sectors = g->sect;
    > > +       geo->cylinders = g->track;
    > > +
    > > +       return 0;
    > > +}
    > > +
    > > +static int floppy_check_change(struct gendisk *disk)
    > > +{
    > > +       struct floppy_state *fs = disk->private_data;
    > > +
    > > +       return fs->ejected;
    > > +}
    > > +
    > > +static int floppy_revalidate(struct gendisk *disk)
    > > +{
    > > +       struct floppy_state *fs = disk->private_data;
    > > +       struct swim __iomem *base = fs->swd->base;
    > > +
    > > +       swim_drive(base, fs->location);
    > > +
    > > +       if (fs->ejected)
    > > +               setup_medium(fs);
    > > +
    > > +       if (!fs->disk_in)
    > > +               swim_motor(base, OFF);
    > > +       else
    > > +               fs->ejected = 0;
    > > +
    > > +       return !fs->disk_in;
    > > +}
    > > +
    > > +static struct block_device_operations floppy_fops = {
    > > +       .owner           = THIS_MODULE,
    > > +       .open            = floppy_open,
    > > +       .release         = floppy_release,
    > > +       .locked_ioctl    = floppy_ioctl,
    > > +       .getgeo          = floppy_getgeo,
    > > +       .media_changed   = floppy_check_change,
    > > +       .revalidate_disk = floppy_revalidate,
    > > +};
    > > +
    > > +static struct kobject *floppy_find(dev_t dev, int *part, void *data)
    > > +{
    > > +       struct swim_priv *swd = data;
    > > +       int drive = (*part & 3);
    > > +
    > > +       if (drive > swd->floppy_count)
    > > +               return NULL;
    > > +
    > > +       *part = 0;
    > > +       return get_disk(swd->unit[drive].disk);
    > > +}
    > > +
    > > +static int __devinit swim_add_floppy(struct swim_priv *swd,
    > > +                                    enum drive_location location)
    > > +{
    > > +       struct floppy_state *fs = &swd->unit[swd->floppy_count];
    > > +       struct swim __iomem *base = swd->base;
    > > +
    > > +       fs->location = location;
    > > +
    > > +       swim_drive(base, location);
    > > +
    > > +       swim_motor(base, OFF);
    > > +
    > > +       if (swim_readbit(base, SINGLE_SIDED))
    > > +               fs->head_number = 1;
    > > +       else
    > > +               fs->head_number = 2;
    > > +       fs->ref_count = 0;
    > > +       fs->ejected = 1;
    > > +
    > > +       swd->floppy_count++;
    > > +
    > > +       return 0;
    > > +}
    > > +
    > > +static int __devinit swim_floppy_init(struct swim_priv *swd)
    > > +{
    > > +       int err;
    > > +       int drive;
    > > +       struct swim __iomem *base = swd->base;
    > > +
    > > +       /* scan floppy drives */
    > > +
    > > +       swim_drive(base, INTERNAL_DRIVE);
    > > +       if (swim_readbit(base, DRIVE_PRESENT))
    > > +               swim_add_floppy(swd, INTERNAL_DRIVE);
    > > +       swim_drive(base, EXTERNAL_DRIVE);
    > > +       if (swim_readbit(base, DRIVE_PRESENT))
    > > +               swim_add_floppy(swd, EXTERNAL_DRIVE);
    > > +
    > > +       /* register floppy drives */
    > > +
    > > +       err = register_blkdev(FLOPPY_MAJOR, "fd");
    > > +       if (err) {
    > > +               printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
    > > +                      FLOPPY_MAJOR);
    > > +               return -EBUSY;
    > > +       }
    > > +
    > > +       for (drive = 0; drive < swd->floppy_count; drive++) {
    > > +               swd->unit[drive].disk = alloc_disk(1);
    > > +               if (swd->unit[drive].disk == NULL) {
    > > +                       err = -ENOMEM;
    > > +                       goto exit_put_disks;
    > > +               }
    > > +               swd->unit[drive].swd = swd;
    > > +       }
    > > +
    > > +       swd->queue = blk_init_queue(do_fd_request, &swd->lock);
    > > +       if (!swd->queue) {
    > > +               err = -ENOMEM;
    > > +               goto exit_put_disks;
    > > +       }
    > > +
    > > +       for (drive = 0; drive < swd->floppy_count; drive++) {
    > > +               swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
    > > +               swd->unit[drive].disk->major = FLOPPY_MAJOR;
    > > +               swd->unit[drive].disk->first_minor = drive;
    > > +               sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
    > > +               swd->unit[drive].disk->fops = &floppy_fops;
    > > +               swd->unit[drive].disk->private_data = &swd->unit[drive];
    > > +               swd->unit[drive].disk->queue = swd->queue;
    > > +               set_capacity(swd->unit[drive].disk, 2880);
    > > +               add_disk(swd->unit[drive].disk);
    > > +       }
    > > +
    > > +       blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
    > > +                           floppy_find, NULL, swd);
    > > +
    > > +       return 0;
    > > +
    > > +exit_put_disks:
    > > +       unregister_blkdev(FLOPPY_MAJOR, "fd");
    > > +       while (drive--)
    > > +               put_disk(swd->unit[drive].disk);
    > > +       return err;
    > > +}
    > > +
    > > +static int __devinit swim_probe(struct platform_device *dev)
    > > +{
    > > +       struct resource *res;
    > > +       struct swim __iomem *swim_base;
    > > +       struct swim_priv *swd;
    > > +       int ret;
    > > +
    > > +       res = platform_get_resource_byname(dev, IORESOURCE_MEM, "swim-regs");
    > > +       if (!res) {
    > > +               ret = -ENODEV;
    > > +               goto out;
    > > +       }
    > > +
    > > +       if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
    > > +               ret = -EBUSY;
    > > +               goto out;
    > > +       }
    > > +
    > > +       swim_base = ioremap(res->start, resource_size(res));
    > > +       if (!swim_base) {
    > > +               return -ENOMEM;
    > > +               goto out_release_io;
    > > +       }
    > > +
    > > +       /* probe device */
    > > +
    > > +       set_swim_mode(swim_base, 1);
    > > +       if (!get_swim_mode(swim_base)) {
    > > +               printk(KERN_INFO "SWIM device not found !\n");
    > > +               ret = -ENODEV;
    > > +               goto out_iounmap;
    > > +       }
    > > +
    > > +       /* set platform driver data */
    > > +
    > > +       swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
    > > +       if (!swd) {
    > > +               ret = -ENOMEM;
    > > +               goto out_iounmap;
    > > +       }
    > > +       platform_set_drvdata(dev, swd);
    > > +
    > > +       swd->base = swim_base;
    > > +
    > > +       ret = swim_floppy_init(swd);
    > > +       if (ret)
    > > +               goto out_kfree;
    > > +
    > > +       return 0;
    > > +
    > > +out_kfree:
    > > +       platform_set_drvdata(dev, NULL);
    > > +       kfree(swd);
    > > +out_iounmap:
    > > +       iounmap(swim_base);
    > > +out_release_io:
    > > +       release_mem_region(res->start, resource_size(res));
    > > +out:
    > > +       return ret;
    > > +}
    > > +
    > > +static int __devexit swim_remove(struct platform_device *dev)
    > > +{
    > > +       struct swim_priv *swd = platform_get_drvdata(dev);
    > > +       int drive;
    > > +       struct resource *res;
    > > +
    > > +       blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
    > > +
    > > +       for (drive = 0; drive < swd->floppy_count; drive++) {
    > > +               del_gendisk(swd->unit[drive].disk);
    > > +               put_disk(swd->unit[drive].disk);
    > > +       }
    > > +
    > > +       unregister_blkdev(FLOPPY_MAJOR, "fd");
    > > +
    > > +       blk_cleanup_queue(swd->queue);
    > > +
    > > +       /* eject floppies */
    > > +
    > > +       for (drive = 0; drive < swd->floppy_count; drive++)
    > > +               floppy_eject(&swd->unit[drive]);
    > > +
    > > +       iounmap(swd->base);
    > > +
    > > +       res = platform_get_resource_byname(dev, IORESOURCE_MEM, "swim-regs");
    > > +       if (res)
    > > +               release_mem_region(res->start, resource_size(res));
    > > +
    > > +       platform_set_drvdata(dev, NULL);
    > > +       kfree(swd);
    > > +
    > > +       return 0;
    > > +}
    > > +
    > > +static struct platform_driver swim_driver = {
    > > +       .probe  = swim_probe,
    > > +       .remove = __devexit_p(swim_remove),
    > > +       .driver   = {
    > > +               .name   = CARDNAME,
    > > +               .owner  = THIS_MODULE,
    > > +       },
    > > +};
    > > +
    > > +static int __init swim_init(void)
    > > +{
    > > +       printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);
    > > +
    > > +       return platform_driver_register(&swim_driver);
    > > +}
    > > +module_init(swim_init);
    > > +
    > > +static void __exit swim_exit(void)
    > > +{
    > > +       platform_driver_unregister(&swim_driver);
    > > +}
    > > +module_exit(swim_exit);
    > > +
    > > +MODULE_DESCRIPTION("Driver for SWIM floppy controller");
    > > +MODULE_LICENSE("GPL");
    > > +MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
    > > +MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
    > > diff --git a/drivers/block/swim_asm.S b/drivers/block/swim_asm.S
    > > new file mode 100644
    > > index 0000000..c966820
    > > --- /dev/null
    > > +++ b/drivers/block/swim_asm.S
    > > @@ -0,0 +1,247 @@
    > > +/*
    > > + * low-level functions for the SWIM floppy controller
    > > + *
    > > + * needs assembly language because is very timing dependent
    > > + * this controller exists only on macintosh 680x0 based
    > > + *
    > > + * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
    > > + *
    > > + * based on Alastair Bridgewater SWIM analysis, 2001
    > > + * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
    > > + *
    > > + * This program is free software; you can redistribute it and/or
    > > + * modify it under the terms of the GNU General Public License
    > > + * as published by the Free Software Foundation; either version
    > > + * 2 of the License, or (at your option) any later version.
    > > + *
    > > + * 2004-08-21 (lv) - Initial implementation
    > > + * 2008-11-05 (lv) - add get_swim_mode
    > > + */
    > > +
    > > +       .equ    write_data,     0x0000
    > > +       .equ    write_mark,     0x0200
    > > +       .equ    write_CRC,      0x0400
    > > +       .equ    write_parameter,0x0600
    > > +       .equ    write_phase,    0x0800
    > > +       .equ    write_setup,    0x0a00
    > > +       .equ    write_mode0,    0x0c00
    > > +       .equ    write_mode1,    0x0e00
    > > +       .equ    read_data,      0x1000
    > > +       .equ    read_mark,      0x1200
    > > +       .equ    read_error,     0x1400
    > > +       .equ    read_parameter, 0x1600
    > > +       .equ    read_phase,     0x1800
    > > +       .equ    read_setup,     0x1a00
    > > +       .equ    read_status,    0x1c00
    > > +       .equ    read_handshake, 0x1e00
    > > +
    > > +       .equ    o_side, 0
    > > +       .equ    o_track, 1
    > > +       .equ    o_sector, 2
    > > +       .equ    o_size, 3
    > > +       .equ    o_crc0, 4
    > > +       .equ    o_crc1, 5
    > > +
    > > +       .equ    seek_time, 30000
    > > +       .equ    max_retry, 40
    > > +       .equ    sector_size, 512
    > > +
    > > +       .global swim_read_sector_header
    > > +swim_read_sector_header:
    > > +       link    %a6, #0
    > > +       moveml  %d1-%d5/%a0-%a4,%sp@-
    > > +       movel   %a6@(0x0c), %a4
    > > +       bsr     mfm_read_addrmark
    > > +       moveml  %sp@+, %d1-%d5/%a0-%a4
    > > +       unlk    %a6
    > > +       rts
    > > +
    > > +sector_address_mark:
    > > +       .byte   0xa1, 0xa1, 0xa1, 0xfe
    > > +sector_data_mark:
    > > +       .byte   0xa1, 0xa1, 0xa1, 0xfb
    > > +
    > > +mfm_read_addrmark:
    > > +       movel   %a6@(0x08), %a3
    > > +       lea     %a3@(read_handshake), %a2
    > > +       lea     %a3@(read_mark), %a3
    > > +       moveq   #-1, %d0
    > > +       movew   #seek_time, %d2
    > > +
    > > +wait_header_init:
    > > +       tstb    %a3@(read_error - read_mark)
    > > +       moveb   #0x18, %a3@(write_mode0 - read_mark)
    > > +       moveb   #0x01, %a3@(write_mode1 - read_mark)
    > > +       moveb   #0x01, %a3@(write_mode0 - read_mark)
    > > +       tstb    %a3@(read_error - read_mark)
    > > +       moveb   #0x08, %a3@(write_mode1 - read_mark)
    > > +
    > > +       lea     sector_address_mark, %a0
    > > +       moveq   #3, %d1
    > > +
    > > +wait_addr_mark_byte:
    > > +
    > > +       tstb    %a2@
    > > +       dbmi    %d2, wait_addr_mark_byte
    > > +       bpl     header_exit
    > > +
    > > +       moveb   %a3@, %d3
    > > +       cmpb    %a0@+, %d3
    > > +       dbne    %d1, wait_addr_mark_byte
    > > +       bne     wait_header_init
    > > +
    > > +       moveq   #max_retry, %d2
    > > +
    > > +amark0:        tstb    %a2@
    > > +       dbmi    %d2, amark0
    > > +       bpl     signal_nonyb
    > > +
    > > +       moveb   %a3@, %a4@(o_track)
    > > +
    > > +       moveq   #max_retry, %d2
    > > +
    > > +amark1:        tstb    %a2@
    > > +       dbmi    %d2, amark1
    > > +       bpl     signal_nonyb
    > > +
    > > +       moveb   %a3@, %a4@(o_side)
    > > +
    > > +       moveq   #max_retry, %d2
    > > +
    > > +amark2:        tstb    %a2@
    > > +       dbmi    %d2, amark2
    > > +       bpl     signal_nonyb
    > > +
    > > +       moveb   %a3@, %a4@(o_sector)
    > > +
    > > +       moveq   #max_retry, %d2
    > > +
    > > +amark3:        tstb    %a2@
    > > +       dbmi    %d2, amark3
    > > +       bpl     signal_nonyb
    > > +
    > > +       moveb   %a3@, %a4@(o_size)
    > > +
    > > +       moveq   #max_retry, %d2
    > > +
    > > +crc0:  tstb    %a2@
    > > +       dbmi    %d2, crc0
    > > +       bpl     signal_nonyb
    > > +
    > > +       moveb   %a3@, %a4@(o_crc0)
    > > +
    > > +       moveq   #max_retry, %d2
    > > +
    > > +crc1:  tstb    %a2@
    > > +       dbmi    %d2, crc1
    > > +       bpl     signal_nonyb
    > > +
    > > +       moveb   %a3@, %a4@(o_crc1)
    > > +
    > > +       tstb    %a3@(read_error - read_mark)
    > > +
    > > +header_exit:
    > > +       moveq   #0, %d0
    > > +       moveb   #0x18, %a3@(write_mode0 - read_mark)
    > > +       rts
    > > +signal_nonyb:
    > > +       moveq   #-1, %d0
    > > +       moveb   #0x18, %a3@(write_mode0 - read_mark)
    > > +       rts
    > > +
    > > +       .global swim_read_sector_data
    > > +swim_read_sector_data:
    > > +       link    %a6, #0
    > > +       moveml  %d1-%d5/%a0-%a5,%sp@-
    > > +       movel   %a6@(0x0c), %a4
    > > +       bsr     mfm_read_data
    > > +       moveml  %sp@+, %d1-%d5/%a0-%a5
    > > +       unlk    %a6
    > > +       rts
    > > +
    > > +mfm_read_data:
    > > +       movel   %a6@(0x08), %a3
    > > +       lea     %a3@(read_handshake), %a2
    > > +       lea     %a3@(read_data), %a5
    > > +       lea     %a3@(read_mark), %a3
    > > +       movew   #seek_time, %d2
    > > +
    > > +wait_data_init:
    > > +       tstb    %a3@(read_error - read_mark)
    > > +       moveb   #0x18, %a3@(write_mode0 - read_mark)
    > > +       moveb   #0x01, %a3@(write_mode1 - read_mark)
    > > +       moveb   #0x01, %a3@(write_mode0 - read_mark)
    > > +       tstb    %a3@(read_error - read_mark)
    > > +       moveb   #0x08, %a3@(write_mode1 - read_mark)
    > > +
    > > +       lea     sector_data_mark, %a0
    > > +       moveq   #3, %d1
    > > +
    > > +       /* wait data address mark */
    > > +
    > > +wait_data_mark_byte:
    > > +
    > > +       tstb    %a2@
    > > +       dbmi    %d2, wait_data_mark_byte
    > > +       bpl     data_exit
    > > +
    > > +       moveb   %a3@, %d3
    > > +       cmpb    %a0@+, %d3
    > > +       dbne    %d1, wait_data_mark_byte
    > > +       bne     wait_data_init
    > > +
    > > +       /* read data */
    > > +
    > > +       tstb    %a3@(read_error - read_mark)
    > > +
    > > +       movel   #sector_size-1, %d4             /* sector size */
    > > +read_new_data:
    > > +       movew   #max_retry, %d2
    > > +read_data_loop:
    > > +       moveb   %a2@, %d5
    > > +       andb    #0xc0, %d5
    > > +       dbne    %d2, read_data_loop
    > > +       beq     data_exit
    > > +       moveb   %a5@, %a4@+
    > > +       andb    #0x40, %d5
    > > +       dbne    %d4, read_new_data
    > > +       beq     exit_loop
    > > +       moveb   %a5@, %a4@+
    > > +       dbra    %d4, read_new_data
    > > +exit_loop:
    > > +
    > > +       /* read CRC */
    > > +
    > > +       movew   #max_retry, %d2
    > > +data_crc0:
    > > +
    > > +       tstb    %a2@
    > > +       dbmi    %d2, data_crc0
    > > +       bpl     data_exit
    > > +
    > > +       moveb   %a3@, %d5
    > > +
    > > +       moveq   #max_retry, %d2
    > > +
    > > +data_crc1:
    > > +
    > > +       tstb    %a2@
    > > +       dbmi    %d2, data_crc1
    > > +       bpl     data_exit
    > > +
    > > +       moveb   %a3@, %d5
    > > +
    > > +       tstb    %a3@(read_error - read_mark)
    > > +
    > > +       moveb   #0x18, %a3@(write_mode0 - read_mark)
    > > +
    > > +       /* return number of bytes read */
    > > +
    > > +       movel   #sector_size, %d0
    > > +       addw    #1, %d4
    > > +       subl    %d4, %d0
    > > +       rts
    > > +data_exit:
    > > +       moveb   #0x18, %a3@(write_mode0 - read_mark)
    > > +       moveq   #-1, %d0
    > > +       rts
    > > --
    > > 1.6.1.3
    > >
    > >
    >
    >
    >
    > --
    > Gr{oetje,eeting}s,
    >
    > Geert
    >
    > --
    > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
    >
    > In personal conversations with technical people, I call myself a hacker. But
    > when I'm talking to journalists I just say "programmer" or something like that.
    > -- Linus Torvalds

    --
    Jens Axboe

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