--- /dev/null
+/*
+ * 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);
--- /dev/null
+/*
+ * 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
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff