patch-2.1.51 linux/drivers/block/swim3.c

• Lines: 1012
• Date: Sat Aug 16 09:53:08 1997
• Orig file: v2.1.50/linux/drivers/block/swim3.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.50/linux/drivers/block/swim3.c linux/drivers/block/swim3.c
@@ -0,0 +1,1011 @@
+/*
+ * Driver for the SWIM3 (Super Woz Integrated Machine 3)
+ * floppy controller found on Power Macintoshes.
+ *
+ * Copyright (C) 1996 Paul Mackerras.
+ *
+ * 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.
+ */
+
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/fd.h>
+#include <linux/ioctl.h>
+#include <asm/io.h>
+#include <asm/dbdma.h>
+#include <asm/prom.h>
+#include <asm/uaccess.h>
+
+#define MAJOR_NR	FLOPPY_MAJOR
+#include <linux/blk.h>
+
+static int floppy_blocksizes[2] = {512};
+static int floppy_sizes[2] = {2880};
+
+enum swim_state {
+	idle,
+	locating,
+	seeking,
+	settling,
+	do_transfer,
+	jogging,
+	available,
+	revalidating,
+	ejecting
+};
+
+#define REG(x)	unsigned char x; char x ## _pad[15];
+
+/*
+ * The names for these registers mostly represent speculation on my part.
+ * It will be interesting to see how close they are to the names Apple uses.
+ */
+struct swim3 {
+	REG(data);
+	REG(usecs);		/* counts down at 1MHz */
+	REG(error);
+	REG(mode);
+	REG(select);		/* controls CA0, CA1, CA2 and LSTRB signals */
+	REG(reg5);
+	REG(control);		/* writing bits clears them */
+	REG(status);		/* writing bits sets them in control */
+	REG(intr);
+	REG(nseek);		/* # tracks to seek */
+	REG(ctrack);		/* current track number */
+	REG(csect);		/* current sector number */
+	REG(ssize);		/* sector size code?? */
+	REG(sector);		/* sector # to read or write */
+	REG(nsect);		/* # sectors to read or write */
+	REG(intr_enable);
+};
+
+#define control_bic	control
+#define control_bis	status
+
+/* Bits in select register */
+#define CA_MASK		7
+#define LSTRB		8
+
+/* Bits in control register */
+#define DO_SEEK		0x80
+#define SELECT		0x20
+#define WRITE_SECTORS	0x10
+#define SCAN_TRACK	0x08
+#define DRIVE_ENABLE	0x02
+#define INTR_ENABLE	0x01
+
+/* Bits in status register */
+#define DATA		0x08
+
+/* Bits in intr and intr_enable registers */
+#define ERROR		0x20
+#define DATA_CHANGED	0x10
+#define TRANSFER_DONE	0x08
+#define SEEN_SECTOR	0x04
+#define SEEK_DONE	0x02
+
+/* Select values for swim3_action */
+#define SEEK_POSITIVE	0
+#define SEEK_NEGATIVE	4
+#define STEP		1
+#define MOTOR_ON	2
+#define MOTOR_OFF	6
+#define EJECT		7
+
+/* Select values for swim3_select and swim3_readbit */
+#define STEP_DIR	0
+#define STEPPING	1
+#define MOTOR_ON	2
+#define RELAX		3
+#define READ_DATA_0	4
+#define SINGLE_SIDED	6
+#define DRIVE_PRESENT	7
+#define DISK_IN		8
+#define WRITE_PROT	9
+#define TRACK_ZERO	10
+#define TACHO		11
+#define READ_DATA_1	12
+#define SEEK_COMPLETE	14
+
+struct floppy_state {
+	enum swim_state	state;
+	volatile struct swim3 *swim3;	/* hardware registers */
+	struct dbdma_regs *dma;	/* DMA controller registers */
+	int	swim3_intr;	/* interrupt number for SWIM3 */
+	int	dma_intr;	/* interrupt number for DMA channel */
+	int	cur_cyl;	/* cylinder head is on, or -1 */
+	int	cur_sector;	/* last sector we saw go past */
+	int	req_cyl;	/* the cylinder for the current r/w request */
+	int	head;		/* head number ditto */
+	int	req_sector;	/* sector number ditto */
+	int	scount;		/* # sectors we're transferring at present */
+	int	retries;
+	int	secpercyl;	/* disk geometry information */
+	int	secpertrack;
+	int	total_secs;
+	int	write_prot;	/* 1 if write-protected, 0 if not, -1 dunno */
+	struct dbdma_cmd *dma_cmd;
+	int	ref_count;
+	int	expect_cyl;
+	struct timer_list timeout;
+	int	ejected;
+	struct wait_queue *wait;
+	int	wanted;
+	char	dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
+};
+
+static struct floppy_state floppy_states[1];
+
+static unsigned short write_preamble[] = {
+	0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e,	/* gap field */
+	0, 0, 0, 0, 0, 0,			/* sync field */
+	0x99a1, 0x99a1, 0x99a1, 0x99fb,		/* data address mark */
+	0x990f					/* init CRC generator */
+};
+
+static unsigned short write_postamble[] = {
+	0x9904,					/* insert CRC */
+	0x4e4e, 0x4e4e,
+	0x9908,					/* stop writing */
+	0, 0, 0, 0, 0, 0
+};
+
+static void swim3_select(struct floppy_state *fs, int sel);
+static void swim3_action(struct floppy_state *fs, int action);
+static int swim3_readbit(struct floppy_state *fs, int bit);
+static void do_fd_request(void);
+static void start_request(struct floppy_state *fs);
+static void scan_track(struct floppy_state *fs);
+static void seek_track(struct floppy_state *fs, int n);
+static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
+static void setup_transfer(struct floppy_state *fs);
+static void act(struct floppy_state *fs);
+static void scan_timeout(unsigned long data);
+static void seek_timeout(unsigned long data);
+static void xfer_timeout(unsigned long data);
+static void swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int grab_drive(struct floppy_state *fs, enum swim_state state,
+		      int interruptible);
+static void release_drive(struct floppy_state *fs);
+static int fd_eject(struct floppy_state *fs);
+static int floppy_ioctl(struct inode *inode, struct file *filp,
+			unsigned int cmd, unsigned long param);
+static int floppy_open(struct inode *inode, struct file *filp);
+static int floppy_release(struct inode *inode, struct file *filp);
+static long floppy_read(struct inode *inode, struct file *filp,
+			char *buf, unsigned long count);
+static long floppy_write(struct inode *inode, struct file *filp,
+			 const char *buf, unsigned long count);
+static int floppy_check_change(kdev_t dev);
+static int floppy_revalidate(kdev_t dev);
+int swim3_init(void);
+
+#define IOCTL_MODE_BIT	8
+#define OPEN_WRITE_BIT	16
+
+static void swim3_select(struct floppy_state *fs, int sel)
+{
+	volatile struct swim3 *sw = fs->swim3;
+
+	out_8(&sw->select, RELAX);
+	if (sel & 8)
+		out_8(&sw->control_bis, SELECT);
+	else
+		out_8(&sw->control_bic, SELECT);
+	out_8(&sw->select, sel & CA_MASK);
+}
+
+static void swim3_action(struct floppy_state *fs, int action)
+{
+	volatile struct swim3 *sw = fs->swim3;
+
+	swim3_select(fs, action);
+	udelay(1);
+	sw->select |= LSTRB; eieio();
+	udelay(2);
+	sw->select &= ~LSTRB; eieio();
+	udelay(1);
+	out_8(&sw->select, RELAX);
+}
+
+static int swim3_readbit(struct floppy_state *fs, int bit)
+{
+	volatile struct swim3 *sw = fs->swim3;
+	int stat;
+
+	swim3_select(fs, bit);
+	udelay(1);
+	stat = in_8(&sw->status);
+	out_8(&sw->select, RELAX);
+	return (stat & DATA) == 0;
+}
+
+static void do_fd_request(void)
+{
+	start_request(&floppy_states[0]);
+	sti();
+}
+
+static void start_request(struct floppy_state *fs)
+{
+	int drive;
+	unsigned long x;
+
+	if (fs->state == idle && fs->wanted) {
+		fs->state = available;
+		wake_up(&fs->wait);
+		return;
+	}
+	while (CURRENT && fs->state == idle) {
+		if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
+			panic(DEVICE_NAME ": request list destroyed");
+		if (CURRENT->bh && !buffer_locked(CURRENT->bh))
+			panic(DEVICE_NAME ": block not locked");
+#if 0
+		printk("do_fd_req: dev=%x cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
+		       kdev_t_to_nr(CURRENT->rq_dev), CURRENT->cmd,
+		       CURRENT->sector, CURRENT->nr_sectors, CURRENT->buffer);
+		printk("           rq_status=%d errors=%d current_nr_sectors=%ld\n",
+		       CURRENT->rq_status, CURRENT->errors, CURRENT->current_nr_sectors);
+#endif
+
+		drive = MINOR(CURRENT->rq_dev);
+		if (drive != 0) {
+			end_request(0);
+			continue;
+		}
+		if (CURRENT->sector < 0 || CURRENT->sector >= fs->total_secs) {
+			end_request(0);
+			continue;
+		}
+		if (CURRENT->current_nr_sectors == 0) {
+			end_request(1);
+			continue;
+		}
+		if (fs->ejected) {
+			end_request(0);
+			continue;
+		}
+
+		if (CURRENT->cmd == WRITE) {
+			if (fs->write_prot < 0)
+				fs->write_prot = swim3_readbit(fs, WRITE_PROT);
+			if (fs->write_prot) {
+				end_request(0);
+				continue;
+			}
+		}
+
+		fs->req_cyl = CURRENT->sector / fs->secpercyl;
+		x = CURRENT->sector % fs->secpercyl;
+		fs->head = x / fs->secpertrack;
+		fs->req_sector = x % fs->secpertrack + 1;
+		fs->state = do_transfer;
+		fs->retries = 0;
+
+		act(fs);
+	}
+}
+
+static inline void scan_track(struct floppy_state *fs)
+{
+	volatile struct swim3 *sw = fs->swim3;
+	int xx;
+
+	swim3_select(fs, READ_DATA_0);
+	xx = sw->intr;		/* clear SEEN_SECTOR bit */
+	out_8(&sw->control_bis, SCAN_TRACK);
+	/* enable intr when track found */
+	out_8(&sw->intr_enable, ERROR | SEEN_SECTOR);
+	/* enable timeout */
+	fs->timeout.expires = jiffies + HZ;
+	fs->timeout.function = scan_timeout;
+	fs->timeout.data = (unsigned long) fs;
+	add_timer(&fs->timeout);
+}
+
+static inline void seek_track(struct floppy_state *fs, int n)
+{
+	volatile struct swim3 *sw = fs->swim3;
+
+	if (n >= 0) {
+		swim3_action(fs, SEEK_POSITIVE);
+		sw->nseek = n;
+	} else {
+		swim3_action(fs, SEEK_NEGATIVE);
+		sw->nseek = -n;
+	}
+	fs->expect_cyl = (fs->cur_cyl > 0)? fs->cur_cyl + n: -1;
+	swim3_select(fs, STEP);
+	out_8(&sw->control_bis, DO_SEEK);
+	/* enable intr when seek finished */
+	out_8(&sw->intr_enable, ERROR | SEEK_DONE);
+	/* enable timeout */
+	fs->timeout.expires = jiffies + HZ/2;
+	fs->timeout.function = seek_timeout;
+	fs->timeout.data = (unsigned long) fs;
+	add_timer(&fs->timeout);
+}
+
+static inline void init_dma(struct dbdma_cmd *cp, int cmd,
+			    void *buf, int count)
+{
+	st_le16(&cp->req_count, count);
+	st_le16(&cp->command, cmd);
+	st_le32(&cp->phy_addr, virt_to_bus(buf));
+	cp->xfer_status = 0;
+}
+
+static inline void setup_transfer(struct floppy_state *fs)
+{
+	int n;
+	volatile struct swim3 *sw = fs->swim3;
+	struct dbdma_cmd *cp = fs->dma_cmd;
+	struct dbdma_regs *dr = fs->dma;
+
+	if (CURRENT->current_nr_sectors <= 0) {
+		printk(KERN_ERR "swim3: transfer 0 sectors?\n");
+		return;
+	}
+	if (CURRENT->cmd == WRITE)
+		n = 1;
+	else {
+		n = fs->secpertrack - fs->req_sector + 1;
+		if (n > CURRENT->current_nr_sectors)
+			n = CURRENT->current_nr_sectors;
+	}
+	fs->scount = n;
+	swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
+	out_8(&sw->sector, fs->req_sector);
+	out_8(&sw->nsect, n);
+	out_8(&sw->ssize, 0);
+	st_le32(&dr->cmdptr, virt_to_bus(cp));
+	if (CURRENT->cmd == WRITE) {
+		/* Set up 3 dma commands: write preamble, data, postamble */
+		init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
+		++cp;
+		init_dma(cp, OUTPUT_MORE, CURRENT->buffer, 512);
+		++cp;
+		init_dma(cp, OUTPUT_MORE, write_postamble, sizeof(write_postamble));
+	} else {
+		init_dma(cp, INPUT_MORE, CURRENT->buffer, n * 512);
+	}
+	++cp;
+	out_le16(&cp->command, DBDMA_STOP);
+	out_le32(&dr->control, (RUN << 16) | RUN);
+	out_8(&sw->control_bis,
+	      (CURRENT->cmd == WRITE? WRITE_SECTORS: 0) | SCAN_TRACK);
+	/* enable intr when transfer complete */
+	out_8(&sw->intr_enable, ERROR | TRANSFER_DONE);
+	/* enable timeout */
+	fs->timeout.expires = jiffies + 2*HZ;
+	fs->timeout.function = xfer_timeout;
+	fs->timeout.data = (unsigned long) fs;
+	add_timer(&fs->timeout);
+}
+
+static void act(struct floppy_state *fs)
+{
+	volatile struct swim3 *sw = fs->swim3;
+
+	for (;;) {
+		switch (fs->state) {
+		case idle:
+			return;		/* XXX shouldn't get here */
+
+		case locating:
+			if (swim3_readbit(fs, TRACK_ZERO)) {
+				fs->cur_cyl = 0;
+				if (fs->req_cyl == 0)
+					fs->state = do_transfer;
+				else
+					fs->state = seeking;
+				break;
+			}
+			scan_track(fs);
+			return;
+
+		case seeking:
+			if (fs->cur_cyl < 0) {
+				fs->expect_cyl = -1;
+				fs->state = locating;
+				break;
+			}
+			if (fs->req_cyl == fs->cur_cyl) {
+				printk("whoops, seeking 0\n");
+				fs->state = do_transfer;
+				break;
+			}
+			seek_track(fs, fs->req_cyl - fs->cur_cyl);
+			return;
+
+		case settling:
+			/* wait for SEEK_COMPLETE to become true */
+			swim3_select(fs, SEEK_COMPLETE);
+			udelay(1);
+			out_8(&sw->intr_enable, ERROR | DATA_CHANGED);
+			in_8(&sw->intr);	/* clear DATA_CHANGED */
+			if (in_8(&sw->status) & DATA) {
+				/* seek_complete is not yet true */
+				fs->timeout.expires = jiffies + HZ/2;
+				fs->timeout.function = seek_timeout;
+				fs->timeout.data = (unsigned long) fs;
+				add_timer(&fs->timeout);
+				return;
+			}
+			out_8(&sw->intr_enable, 0);
+			in_8(&sw->intr);
+			fs->state = locating;
+			break;
+
+		case do_transfer:
+			if (fs->cur_cyl != fs->req_cyl) {
+				if (fs->retries > 5) {
+					end_request(0);
+					fs->state = idle;
+					return;
+				}
+				fs->state = seeking;
+				break;
+			}
+			setup_transfer(fs);
+			return;
+
+		case jogging:
+			seek_track(fs, -5);
+			return;
+
+		default:
+			printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
+			return;
+		}
+	}
+}
+
+static void scan_timeout(unsigned long data)
+{
+	struct floppy_state *fs = (struct floppy_state *) data;
+	volatile struct swim3 *sw = fs->swim3;
+
+	out_8(&sw->control_bic, SCAN_TRACK);
+	out_8(&sw->select, RELAX);
+	out_8(&sw->intr_enable, 0);
+	fs->cur_cyl = -1;
+	if (fs->retries > 5) {
+		end_request(0);
+		fs->state = idle;
+		start_request(fs);
+	} else {
+		fs->state = jogging;
+		act(fs);
+	}
+}
+
+static void seek_timeout(unsigned long data)
+{
+	struct floppy_state *fs = (struct floppy_state *) data;
+	volatile struct swim3 *sw = fs->swim3;
+
+	if (fs->state == settling) {
+		printk(KERN_ERR "swim3: MSI sel=%x ctrl=%x stat=%x intr=%x ie=%x\n",
+		       sw->select, sw->control, sw->status, sw->intr, sw->intr_enable);
+	}
+	out_8(&sw->control_bic, DO_SEEK);
+	out_8(&sw->select, RELAX);
+	out_8(&sw->intr_enable, 0);
+	if (fs->state == settling && swim3_readbit(fs, SEEK_COMPLETE)) {
+		/* printk(KERN_DEBUG "swim3: missed settling interrupt\n"); */
+		fs->state = locating;
+		act(fs);
+		return;
+	}
+	printk(KERN_ERR "swim3: seek timeout\n");
+	end_request(0);
+	fs->state = idle;
+	start_request(fs);
+}
+
+static void xfer_timeout(unsigned long data)
+{
+	struct floppy_state *fs = (struct floppy_state *) data;
+	volatile struct swim3 *sw = fs->swim3;
+	struct dbdma_regs *dr = fs->dma;
+	struct dbdma_cmd *cp = fs->dma_cmd;
+	unsigned long s;
+
+	st_le32(&dr->control, RUN << 16);
+	out_8(&sw->intr_enable, 0);
+	out_8(&sw->control_bic, WRITE_SECTORS | SCAN_TRACK);
+	out_8(&sw->select, RELAX);
+	if (CURRENT->cmd == WRITE)
+		++cp;
+	if (ld_le16(&cp->xfer_status) != 0)
+		s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
+	else
+		s = 0;
+	CURRENT->sector += s;
+	CURRENT->current_nr_sectors -= s;
+	printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
+	       (CURRENT->cmd==WRITE? "writ": "read"), CURRENT->sector);
+	end_request(0);
+	fs->state = idle;
+	start_request(fs);
+}
+
+static void swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct floppy_state *fs = (struct floppy_state *) dev_id;
+	volatile struct swim3 *sw = fs->swim3;
+	int intr, err, n;
+	int stat, resid;
+	struct dbdma_regs *dr;
+	struct dbdma_cmd *cp;
+
+	err = in_8(&sw->error);
+	intr = in_8(&sw->intr);
+	if ((intr & ERROR) && fs->state != do_transfer)
+		printk(KERN_ERR "swim3_interrupt, state=%d, cmd=%x, intr=%x, err=%x\n",
+		       fs->state, CURRENT->cmd, intr, err);
+	switch (fs->state) {
+	case locating:
+		if (intr & SEEN_SECTOR) {
+			out_8(&sw->control_bic, SCAN_TRACK);
+			out_8(&sw->select, RELAX);
+			out_8(&sw->intr_enable, 0);
+			del_timer(&fs->timeout);
+			if (sw->ctrack == 0xff) {
+				printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
+				fs->cur_cyl = -1;
+				if (fs->retries > 5) {
+					end_request(0);
+					fs->state = idle;
+					start_request(fs);
+				} else {
+					fs->state = jogging;
+					act(fs);
+				}
+				break;
+			}
+			fs->cur_cyl = sw->ctrack;
+			fs->cur_sector = sw->csect;
+			if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
+				printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
+				       fs->expect_cyl, fs->cur_cyl);
+			fs->state = do_transfer;
+			act(fs);
+		}
+		break;
+	case seeking:
+	case jogging:
+		if (sw->nseek == 0) {
+			out_8(&sw->control_bic, DO_SEEK);
+			out_8(&sw->select, RELAX);
+			out_8(&sw->intr_enable, 0);
+			del_timer(&fs->timeout);
+			if (fs->state == seeking)
+				++fs->retries;
+			fs->state = settling;
+			act(fs);
+		}
+		break;
+	case settling:
+		out_8(&sw->intr_enable, 0);
+		del_timer(&fs->timeout);
+		act(fs);
+		break;
+	case do_transfer:
+		if ((intr & (ERROR | TRANSFER_DONE)) == 0)
+			break;
+		dr = fs->dma;
+		cp = fs->dma_cmd;
+		st_le32(&dr->control, RUN << 16);
+		out_8(&sw->intr_enable, 0);
+		out_8(&sw->control_bic, WRITE_SECTORS | SCAN_TRACK);
+		out_8(&sw->select, RELAX);
+		del_timer(&fs->timeout);
+		if (CURRENT->cmd == WRITE)
+			++cp;
+		stat = ld_le16(&cp->xfer_status);
+		resid = ld_le16(&cp->res_count);
+		if (intr & ERROR) {
+			n = fs->scount - 1 - resid / 512;
+			if (n > 0) {
+				CURRENT->sector += n;
+				CURRENT->current_nr_sectors -= n;
+				CURRENT->buffer += n * 512;
+				fs->req_sector += n;
+			}
+			if (fs->retries < 5) {
+				++fs->retries;
+				act(fs);
+			} else {
+				printk("swim3: error %sing block %ld (err=%x)\n",
+				       CURRENT->cmd == WRITE? "writ": "read",
+				       CURRENT->sector, err);
+				end_request(0);
+				fs->state = idle;
+			}
+		} else {
+			if ((stat & ACTIVE) == 0 || resid != 0) {
+				/* musta been an error */
+				printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
+				printk(KERN_ERR "  state=%d, cmd=%x, intr=%x, err=%x\n",
+				       fs->state, CURRENT->cmd, intr, err);
+				end_request(0);
+				fs->state = idle;
+				start_request(fs);
+				break;
+			}
+			CURRENT->sector += fs->scount;
+			CURRENT->current_nr_sectors -= fs->scount;
+			CURRENT->buffer += fs->scount * 512;
+			if (CURRENT->current_nr_sectors <= 0) {
+				end_request(1);
+				fs->state = idle;
+			} else {
+				fs->req_sector += fs->scount;
+				if (fs->req_sector > fs->secpertrack) {
+					fs->req_sector -= fs->secpertrack;
+					if (++fs->head > 1) {
+						fs->head = 0;
+						++fs->req_cyl;
+					}
+				}
+				act(fs);
+			}
+		}
+		if (fs->state == idle)
+			start_request(fs);
+		break;
+	default:
+		printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
+	}
+}
+
+static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+}
+
+static int grab_drive(struct floppy_state *fs, enum swim_state state,
+		      int interruptible)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	if (fs->state != idle) {
+		++fs->wanted;
+		while (fs->state != available) {
+			if (interruptible
+			    && (current->signal & ~current->blocked)) {
+				--fs->wanted;
+				restore_flags(flags);
+				return -EINTR;
+			}
+			interruptible_sleep_on(&fs->wait);
+		}
+		--fs->wanted;
+	}
+	fs->state = state;
+	restore_flags(flags);
+	return 0;
+}
+
+static void release_drive(struct floppy_state *fs)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	fs->state = idle;
+	start_request(fs);
+	restore_flags(flags);
+}
+
+static int fd_eject(struct floppy_state *fs)
+{
+	int err, n;
+
+	err = grab_drive(fs, ejecting, 1);
+	if (err)
+		return err;
+	swim3_action(fs, EJECT);
+	for (n = 2*HZ; n > 0; --n) {
+		if (swim3_readbit(fs, RELAX))
+			break;
+		if ((current->signal & ~current->blocked) != 0) {
+			err = -EINTR;
+			break;
+		}
+		current->state = TASK_INTERRUPTIBLE;
+		current->timeout = jiffies + 1;
+		schedule();
+	}
+	fs->ejected = 1;
+	release_drive(fs);
+	return err;
+}
+
+static struct floppy_struct floppy_type =
+	{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };	/*  7 1.44MB 3.5"   */
+
+static int floppy_ioctl(struct inode *inode, struct file *filp,
+			unsigned int cmd, unsigned long param)
+{
+	struct floppy_state *fs;
+	int err;
+
+	if (((cmd & 0x80) && !suser())
+	    || ((cmd & 0x40) && !(filp && (filp->f_mode & IOCTL_MODE_BIT))))
+		return -EPERM;
+
+	fs = &floppy_states[0];
+	switch (cmd) {
+	case FDEJECT:
+		if (fs->ref_count != 1)
+			return -EBUSY;
+		err = fd_eject(fs);
+		return err;
+	case FDGETPRM:
+	        err = copy_to_user((void *) param, (void *) &floppy_type,
+				   sizeof(struct floppy_struct));
+		return err;
+	}
+	return -ENOIOCTLCMD;
+}
+
+static int floppy_open(struct inode *inode, struct file *filp)
+{
+	struct floppy_state *fs;
+	volatile struct swim3 *sw;
+	int n, err;
+
+	if (MINOR(inode->i_rdev) != 0)
+		return -ENODEV;
+	fs = &floppy_states[0];
+	sw = fs->swim3;
+	err = 0;
+	if (fs->ref_count == 0) {
+		out_8(&sw->intr_enable, 0);
+		out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
+		swim3_action(fs, MOTOR_ON);
+		fs->write_prot = -1;
+		fs->cur_cyl = -1;
+		for (n = HZ; n > 0; --n) {
+			if (swim3_readbit(fs, SEEK_COMPLETE))
+				break;
+			if ((current->signal & ~current->blocked) != 0) {
+				err = -EINTR;
+				break;
+			}
+			current->state = TASK_INTERRUPTIBLE;
+			current->timeout = jiffies + 1;
+			schedule();
+		}
+		if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
+				 || swim3_readbit(fs, DISK_IN) == 0))
+			err = -ENXIO;
+		swim3_action(fs, 9);
+
+	} else if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
+		return -EBUSY;
+
+	if (err == 0 && filp && (filp->f_flags & O_NDELAY) == 0
+	    && (filp->f_mode & 3)) {
+		check_disk_change(inode->i_rdev);
+		if (fs->ejected)
+			err = -ENXIO;
+	}
+
+	if (err == 0 && filp && (filp->f_flags & (O_WRONLY | O_RDWR))) {
+		if (fs->write_prot < 0)
+			fs->write_prot = swim3_readbit(fs, WRITE_PROT);
+		if (fs->write_prot)
+			err = -EROFS;
+	}
+
+	if (err) {
+		if (fs->ref_count == 0) {
+			swim3_action(fs, MOTOR_OFF);
+			out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
+		}
+		return err;
+	}
+
+	if (filp->f_flags & O_EXCL)
+		fs->ref_count = -1;
+	else
+		++fs->ref_count;
+
+	/* Allow ioctls if we have write-permissions even if read-only open */
+	if ((filp->f_mode & 2) || (permission(inode, 2) == 0))
+		filp->f_mode |= IOCTL_MODE_BIT;
+	if (filp->f_mode & 2)
+		filp->f_mode |= OPEN_WRITE_BIT;
+
+	return 0;
+}
+
+static int floppy_release(struct inode *inode, struct file *filp)
+{
+	struct floppy_state *fs;
+	volatile struct swim3 *sw;
+
+	if (MINOR(inode->i_rdev) != 0)
+		return -ENXIO;
+	fs = &floppy_states[0];
+	if (filp == 0 || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
+		block_fsync(inode, filp);
+	sw = fs->swim3;
+	if (fs->ref_count > 0 && --fs->ref_count == 0) {
+		swim3_action(fs, MOTOR_OFF);
+		out_8(&sw->control_bic, 0xff);
+	}
+	return 0;
+}
+
+static int floppy_check_change(kdev_t dev)
+{
+	struct floppy_state *fs;
+
+	if (MAJOR(dev) != MAJOR_NR || MINOR(dev) != 0)
+		return 0;
+	fs = &floppy_states[0];
+	return fs->ejected;
+}
+
+static int floppy_revalidate(kdev_t dev)
+{
+	struct floppy_state *fs;
+	volatile struct swim3 *sw;
+	int ret, n;
+
+	if (MAJOR(dev) != MAJOR_NR || MINOR(dev) != 0)
+		return 0;
+	fs = &floppy_states[0];
+	sw = fs->swim3;
+	grab_drive(fs, revalidating, 0);
+	out_8(&sw->intr_enable, 0);
+	out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
+	swim3_action(fs, MOTOR_ON);
+	fs->write_prot = -1;
+	fs->cur_cyl = -1;
+	for (n = HZ; n > 0; --n) {
+		if (swim3_readbit(fs, SEEK_COMPLETE))
+			break;
+		if ((current->signal & ~current->blocked) != 0)
+			break;
+		current->state = TASK_INTERRUPTIBLE;
+		current->timeout = jiffies + 1;
+		schedule();
+	}
+	ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
+		|| swim3_readbit(fs, DISK_IN) == 0;
+	if (ret)
+		swim3_action(fs, MOTOR_OFF);
+	else {
+		fs->ejected = 0;
+		swim3_action(fs, 9);
+	}
+
+	release_drive(fs);
+	return ret;
+}
+
+static long floppy_read(struct inode *inode, struct file *filp,
+			char *buf, unsigned long count)
+{
+	struct floppy_state *fs;
+
+	if (MINOR(inode->i_rdev) != 0)
+		return -ENODEV;
+	fs = &floppy_states[0];
+	if (fs->ejected)
+		return -ENXIO;
+	return block_read(inode, filp, buf, count);
+}
+
+static long floppy_write(struct inode *inode, struct file *filp,
+			 const char *buf, unsigned long count)
+{
+	struct floppy_state *fs;
+
+	if (MINOR(inode->i_rdev) != 0)
+		return -ENODEV;
+	fs = &floppy_states[0];
+	if (fs->ejected)
+		return -ENXIO;
+	return block_write(inode, filp, buf, count);
+}
+
+static void floppy_off(unsigned int nr)
+{
+}
+
+static struct file_operations floppy_fops = {
+	NULL,			/* lseek */
+	floppy_read,		/* read */
+	floppy_write,		/* write */
+	NULL,			/* readdir */
+	NULL,			/* poll */
+	floppy_ioctl,		/* ioctl */
+	NULL,			/* mmap */
+	floppy_open,		/* open */
+	floppy_release,		/* release */
+	block_fsync,		/* fsync */
+	NULL,			/* fasync */
+	floppy_check_change,	/* check_media_change */
+	floppy_revalidate,	/* revalidate */
+};
+
+int swim3_init(void)
+{
+	struct device_node *swims;
+	struct floppy_state *fs = &floppy_states[0];
+	volatile struct swim3 *sw;
+
+	swims = find_devices("swim3");
+	if (swims == NULL)
+		return 0;
+
+	if (swims->next != NULL)
+		printk(KERN_ERR "Warning: only using first SWIM3 floppy controller\n");
+	if (swims->n_addrs != 2 || swims->n_intrs != 2) {
+		printk(KERN_ERR "swim3: expecting 2 addrs and 2 intrs! (%d, %d)\n",
+		       swims->n_addrs, swims->n_intrs);
+		return -EINVAL;
+	}
+
+	if (register_blkdev(MAJOR_NR, "fd", &floppy_fops)) {
+		printk(KERN_ERR "Unable to get major %d for floppy\n",
+		       MAJOR_NR);
+		return -EBUSY;
+	}
+	blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
+	blksize_size[MAJOR_NR] = floppy_blocksizes;
+	blk_size[MAJOR_NR] = floppy_sizes;
+
+	memset(fs, 0, sizeof(*fs));
+	fs->state = idle;
+	fs->swim3 = (volatile struct swim3 *) swims->addrs[0].address;
+	fs->dma = (struct dbdma_regs *) swims->addrs[1].address;
+	fs->swim3_intr = swims->intrs[0];
+	fs->dma_intr = swims->intrs[1];
+	fs->cur_cyl = -1;
+	fs->cur_sector = -1;
+	fs->secpercyl = 36;
+	fs->secpertrack = 18;
+	fs->total_secs = 2880;
+
+	fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
+	memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
+	st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
+
+	if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
+		printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr);
+		return -EBUSY;
+	}
+	if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
+		printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
+		       fs->dma_intr);
+		return -EBUSY;
+	}
+
+	sw = fs->swim3;
+	out_8(&sw->mode, 0x95);
+	out_8(&sw->control_bic, 0xff);
+	out_8(&sw->reg5, 0x28);
+
+	do_floppy = NULL;
+
+	printk(KERN_INFO "fd0: SWIM3 floppy controller\n");
+
+	return 0;
+}