Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1154 insertions, 0 deletions

diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
new file mode 100644
index 000000000000..5b09cf154ac7
--- /dev/null
+++ b/drivers/block/swim3.c
@@ -0,0 +1,1154 @@
+/*
+ * 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.
+ */
+
+/*
+ * TODO:
+ * handle 2 drives
+ * handle GCR disks
+ */
+
+#include <linux/config.h>
+#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 <linux/blkdev.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <asm/io.h>
+#include <asm/dbdma.h>
+#include <asm/prom.h>
+#include <asm/uaccess.h>
+#include <asm/mediabay.h>
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+
+static struct request_queue *swim3_queue;
+static struct gendisk *disks[2];
+static struct request *fd_req;
+
+#define MAX_FLOPPIES	2
+
+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(timer);		/* counts down at 1MHz */
+	REG(error);
+	REG(mode);
+	REG(select);		/* controls CA0, CA1, CA2 and LSTRB signals */
+	REG(setup);
+	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(gap3);		/* size of gap 3 in track format */
+	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 FORMAT		0x40
+#define SELECT		0x20
+#define WRITE_SECTORS	0x10
+#define DO_ACTION	0x08
+#define DRIVE2_ENABLE	0x04
+#define DRIVE_ENABLE	0x02
+#define INTR_ENABLE	0x01
+
+/* Bits in status register */
+#define FIFO_1BYTE	0x80
+#define FIFO_2BYTE	0x40
+#define ERROR		0x20
+#define DATA		0x08
+#define RDDATA		0x04
+#define INTR_PENDING	0x02
+#define MARK_BYTE	0x01
+
+/* Bits in intr and intr_enable registers */
+#define ERROR_INTR	0x20
+#define DATA_CHANGED	0x10
+#define TRANSFER_DONE	0x08
+#define SEEN_SECTOR	0x04
+#define SEEK_DONE	0x02
+#define TIMER_DONE	0x01
+
+/* Bits in error register */
+#define ERR_DATA_CRC	0x80
+#define ERR_ADDR_CRC	0x40
+#define ERR_OVERRUN	0x04
+#define ERR_UNDERRUN	0x01
+
+/* Bits in setup register */
+#define S_SW_RESET	0x80
+#define S_GCR_WRITE	0x40
+#define S_IBM_DRIVE	0x20
+#define S_TEST_MODE	0x10
+#define S_FCLK_DIV2	0x08
+#define S_GCR		0x04
+#define S_COPY_PROT	0x02
+#define S_INV_WDATA	0x01
+
+/* 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 INDEX		3
+#define EJECT		7
+#define SETMFM		9
+#define SETGCR		13
+
+/* Select values for swim3_select and swim3_readbit */
+#define STEP_DIR	0
+#define STEPPING	1
+#define MOTOR_ON	2
+#define RELAX		3	/* also eject in progress */
+#define READ_DATA_0	4
+#define TWOMEG_DRIVE	5
+#define SINGLE_SIDED	6	/* drive or diskette is 4MB type? */
+#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 MFM_MODE	13
+#define SEEK_COMPLETE	14
+#define ONEMEG_MEDIA	15
+
+/* Definitions of values used in writing and formatting */
+#define DATA_ESCAPE	0x99
+#define GCR_SYNC_EXC	0x3f
+#define GCR_SYNC_CONV	0x80
+#define GCR_FIRST_MARK	0xd5
+#define GCR_SECOND_MARK	0xaa
+#define GCR_ADDR_MARK	"\xd5\xaa\x00"
+#define GCR_DATA_MARK	"\xd5\xaa\x0b"
+#define GCR_SLIP_BYTE	"\x27\xaa"
+#define GCR_SELF_SYNC	"\x3f\xbf\x1e\x34\x3c\x3f"
+
+#define DATA_99		"\x99\x99"
+#define MFM_ADDR_MARK	"\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
+#define MFM_INDEX_MARK	"\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
+#define MFM_GAP_LEN	12
+
+struct floppy_state {
+	enum swim_state	state;
+	struct swim3 __iomem *swim3;	/* hardware registers */
+	struct dbdma_regs __iomem *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	settle_time;
+	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	timeout_pending;
+	int	ejected;
+	wait_queue_head_t wait;
+	int	wanted;
+	struct device_node*	media_bay; /* NULL when not in bay */
+	char	dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
+};
+
+static struct floppy_state floppy_states[MAX_FLOPPIES];
+static int floppy_count = 0;
+static DEFINE_SPINLOCK(swim3_lock);
+
+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					/* no escape for 512 bytes */
+};
+
+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(request_queue_t * q);
+static void start_request(struct floppy_state *fs);
+static void set_timeout(struct floppy_state *fs, int nticks,
+			void (*proc)(unsigned long));
+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 settle_timeout(unsigned long data);
+static void xfer_timeout(unsigned long data);
+static irqreturn_t 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 int floppy_check_change(struct gendisk *disk);
+static int floppy_revalidate(struct gendisk *disk);
+static int swim3_add_device(struct device_node *swims);
+int swim3_init(void);
+
+#ifndef CONFIG_PMAC_PBOOK
+#define check_media_bay(which, what)	1
+#endif
+
+static void swim3_select(struct floppy_state *fs, int sel)
+{
+	struct swim3 __iomem *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)
+{
+	struct swim3 __iomem *sw = fs->swim3;
+
+	swim3_select(fs, action);
+	udelay(1);
+	out_8(&sw->select, sw->select | LSTRB);
+	udelay(2);
+	out_8(&sw->select, sw->select & ~LSTRB);
+	udelay(1);
+}
+
+static int swim3_readbit(struct floppy_state *fs, int bit)
+{
+	struct swim3 __iomem *sw = fs->swim3;
+	int stat;
+
+	swim3_select(fs, bit);
+	udelay(1);
+	stat = in_8(&sw->status);
+	return (stat & DATA) == 0;
+}
+
+static void do_fd_request(request_queue_t * q)
+{
+	int i;
+	for(i=0;i<floppy_count;i++)
+	{
+		if (floppy_states[i].media_bay &&
+			check_media_bay(floppy_states[i].media_bay, MB_FD))
+			continue;
+		start_request(&floppy_states[i]);
+	}
+	sti();
+}
+
+static void start_request(struct floppy_state *fs)
+{
+	struct request *req;
+	unsigned long x;
+
+	if (fs->state == idle && fs->wanted) {
+		fs->state = available;
+		wake_up(&fs->wait);
+		return;
+	}
+	while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
+#if 0
+		printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
+		       req->rq_disk->disk_name, req->cmd,
+		       (long)req->sector, req->nr_sectors, req->buffer);
+		printk("           rq_status=%d errors=%d current_nr_sectors=%ld\n",
+		       req->rq_status, req->errors, req->current_nr_sectors);
+#endif
+
+		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->ejected) {
+			end_request(req, 0);
+			continue;
+		}
+
+		if (rq_data_dir(req) == WRITE) {
+			if (fs->write_prot < 0)
+				fs->write_prot = swim3_readbit(fs, WRITE_PROT);
+			if (fs->write_prot) {
+				end_request(req, 0);
+				continue;
+			}
+		}
+
+		/* Do not remove the cast. req->sector is now a sector_t and
+		 * can be 64 bits, but it will never go past 32 bits for this
+		 * driver anyway, so we can safely cast it down and not have
+		 * to do a 64/32 division
+		 */
+		fs->req_cyl = ((long)req->sector) / fs->secpercyl;
+		x = ((long)req->sector) % fs->secpercyl;
+		fs->head = x / fs->secpertrack;
+		fs->req_sector = x % fs->secpertrack + 1;
+		fd_req = req;
+		fs->state = do_transfer;
+		fs->retries = 0;
+
+		act(fs);
+	}
+}
+
+static void set_timeout(struct floppy_state *fs, int nticks,
+			void (*proc)(unsigned long))
+{
+	unsigned long flags;
+
+	save_flags(flags); cli();
+	if (fs->timeout_pending)
+		del_timer(&fs->timeout);
+	fs->timeout.expires = jiffies + nticks;
+	fs->timeout.function = proc;
+	fs->timeout.data = (unsigned long) fs;
+	add_timer(&fs->timeout);
+	fs->timeout_pending = 1;
+	restore_flags(flags);
+}
+
+static inline void scan_track(struct floppy_state *fs)
+{
+	struct swim3 __iomem *sw = fs->swim3;
+
+	swim3_select(fs, READ_DATA_0);
+	in_8(&sw->intr);		/* clear SEEN_SECTOR bit */
+	in_8(&sw->error);
+	out_8(&sw->intr_enable, SEEN_SECTOR);
+	out_8(&sw->control_bis, DO_ACTION);
+	/* enable intr when track found */
+	set_timeout(fs, HZ, scan_timeout);	/* enable timeout */
+}
+
+static inline void seek_track(struct floppy_state *fs, int n)
+{
+	struct swim3 __iomem *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);
+	in_8(&sw->error);
+	/* enable intr when seek finished */
+	out_8(&sw->intr_enable, SEEK_DONE);
+	out_8(&sw->control_bis, DO_SEEK);
+	set_timeout(fs, 3*HZ, seek_timeout);	/* enable timeout */
+	fs->settle_time = 0;
+}
+
+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;
+	struct swim3 __iomem *sw = fs->swim3;
+	struct dbdma_cmd *cp = fs->dma_cmd;
+	struct dbdma_regs __iomem *dr = fs->dma;
+
+	if (fd_req->current_nr_sectors <= 0) {
+		printk(KERN_ERR "swim3: transfer 0 sectors?\n");
+		return;
+	}
+	if (rq_data_dir(fd_req) == WRITE)
+		n = 1;
+	else {
+		n = fs->secpertrack - fs->req_sector + 1;
+		if (n > fd_req->current_nr_sectors)
+			n = fd_req->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->gap3, 0);
+	out_le32(&dr->cmdptr, virt_to_bus(cp));
+	if (rq_data_dir(fd_req) == 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, fd_req->buffer, 512);
+		++cp;
+		init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
+	} else {
+		init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
+	}
+	++cp;
+	out_le16(&cp->command, DBDMA_STOP);
+	out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
+	in_8(&sw->error);
+	out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
+	if (rq_data_dir(fd_req) == WRITE)
+		out_8(&sw->control_bis, WRITE_SECTORS);
+	in_8(&sw->intr);
+	out_le32(&dr->control, (RUN << 16) | RUN);
+	/* enable intr when transfer complete */
+	out_8(&sw->intr_enable, TRANSFER_DONE);
+	out_8(&sw->control_bis, DO_ACTION);
+	set_timeout(fs, 2*HZ, xfer_timeout);	/* enable timeout */
+}
+
+static void act(struct floppy_state *fs)
+{
+	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:
+			/* check for SEEK_COMPLETE after 30ms */
+			fs->settle_time = (HZ + 32) / 33;
+			set_timeout(fs, fs->settle_time, settle_timeout);
+			return;
+
+		case do_transfer:
+			if (fs->cur_cyl != fs->req_cyl) {
+				if (fs->retries > 5) {
+					end_request(fd_req, 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;
+	struct swim3 __iomem *sw = fs->swim3;
+
+	fs->timeout_pending = 0;
+	out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
+	out_8(&sw->select, RELAX);
+	out_8(&sw->intr_enable, 0);
+	fs->cur_cyl = -1;
+	if (fs->retries > 5) {
+		end_request(fd_req, 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;
+	struct swim3 __iomem *sw = fs->swim3;
+
+	fs->timeout_pending = 0;
+	out_8(&sw->control_bic, DO_SEEK);
+	out_8(&sw->select, RELAX);
+	out_8(&sw->intr_enable, 0);
+	printk(KERN_ERR "swim3: seek timeout\n");
+	end_request(fd_req, 0);
+	fs->state = idle;
+	start_request(fs);
+}
+
+static void settle_timeout(unsigned long data)
+{
+	struct floppy_state *fs = (struct floppy_state *) data;
+	struct swim3 __iomem *sw = fs->swim3;
+
+	fs->timeout_pending = 0;
+	if (swim3_readbit(fs, SEEK_COMPLETE)) {
+		out_8(&sw->select, RELAX);
+		fs->state = locating;
+		act(fs);
+		return;
+	}
+	out_8(&sw->select, RELAX);
+	if (fs->settle_time < 2*HZ) {
+		++fs->settle_time;
+		set_timeout(fs, 1, settle_timeout);
+		return;
+	}
+	printk(KERN_ERR "swim3: seek settle timeout\n");
+	end_request(fd_req, 0);
+	fs->state = idle;
+	start_request(fs);
+}
+
+static void xfer_timeout(unsigned long data)
+{
+	struct floppy_state *fs = (struct floppy_state *) data;
+	struct swim3 __iomem *sw = fs->swim3;
+	struct dbdma_regs __iomem *dr = fs->dma;
+	struct dbdma_cmd *cp = fs->dma_cmd;
+	unsigned long s;
+	int n;
+
+	fs->timeout_pending = 0;
+	out_le32(&dr->control, RUN << 16);
+	/* We must wait a bit for dbdma to stop */
+	for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
+		udelay(1);
+	out_8(&sw->intr_enable, 0);
+	out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
+	out_8(&sw->select, RELAX);
+	if (rq_data_dir(fd_req) == WRITE)
+		++cp;
+	if (ld_le16(&cp->xfer_status) != 0)
+		s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
+	else
+		s = 0;
+	fd_req->sector += s;
+	fd_req->current_nr_sectors -= s;
+	printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
+	       (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
+	end_request(fd_req, 0);
+	fs->state = idle;
+	start_request(fs);
+}
+
+static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct floppy_state *fs = (struct floppy_state *) dev_id;
+	struct swim3 __iomem *sw = fs->swim3;
+	int intr, err, n;
+	int stat, resid;
+	struct dbdma_regs __iomem *dr;
+	struct dbdma_cmd *cp;
+
+	intr = in_8(&sw->intr);
+	err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
+	if ((intr & ERROR_INTR) && fs->state != do_transfer)
+		printk(KERN_ERR "swim3_interrupt, state=%d, dir=%lx, intr=%x, err=%x\n",
+		       fs->state, rq_data_dir(fd_req), intr, err);
+	switch (fs->state) {
+	case locating:
+		if (intr & SEEN_SECTOR) {
+			out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
+			out_8(&sw->select, RELAX);
+			out_8(&sw->intr_enable, 0);
+			del_timer(&fs->timeout);
+			fs->timeout_pending = 0;
+			if (sw->ctrack == 0xff) {
+				printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
+				fs->cur_cyl = -1;
+				if (fs->retries > 5) {
+					end_request(fd_req, 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);
+			fs->timeout_pending = 0;
+			if (fs->state == seeking)
+				++fs->retries;
+			fs->state = settling;
+			act(fs);
+		}
+		break;
+	case settling:
+		out_8(&sw->intr_enable, 0);
+		del_timer(&fs->timeout);
+		fs->timeout_pending = 0;
+		act(fs);
+		break;
+	case do_transfer:
+		if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
+			break;
+		out_8(&sw->intr_enable, 0);
+		out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
+		out_8(&sw->select, RELAX);
+		del_timer(&fs->timeout);
+		fs->timeout_pending = 0;
+		dr = fs->dma;
+		cp = fs->dma_cmd;
+		if (rq_data_dir(fd_req) == WRITE)
+			++cp;
+		/*
+		 * Check that the main data transfer has finished.
+		 * On writing, the swim3 sometimes doesn't use
+		 * up all the bytes of the postamble, so we can still
+		 * see DMA active here.  That doesn't matter as long
+		 * as all the sector data has been transferred.
+		 */
+		if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
+			/* wait a little while for DMA to complete */
+			for (n = 0; n < 100; ++n) {
+				if (cp->xfer_status != 0)
+					break;
+				udelay(1);
+				barrier();
+			}
+		}
+		/* turn off DMA */
+		out_le32(&dr->control, (RUN | PAUSE) << 16);
+		stat = ld_le16(&cp->xfer_status);
+		resid = ld_le16(&cp->res_count);
+		if (intr & ERROR_INTR) {
+			n = fs->scount - 1 - resid / 512;
+			if (n > 0) {
+				fd_req->sector += n;
+				fd_req->current_nr_sectors -= n;
+				fd_req->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",
+				       rq_data_dir(fd_req) == WRITE? "writ": "read",
+				       (long)fd_req->sector, err);
+				end_request(fd_req, 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, dir=%lx, intr=%x, err=%x\n",
+				       fs->state, rq_data_dir(fd_req), intr, err);
+				end_request(fd_req, 0);
+				fs->state = idle;
+				start_request(fs);
+				break;
+			}
+			fd_req->sector += fs->scount;
+			fd_req->current_nr_sectors -= fs->scount;
+			fd_req->buffer += fs->scount * 512;
+			if (fd_req->current_nr_sectors <= 0) {
+				end_request(fd_req, 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);
+	}
+	return IRQ_HANDLED;
+}
+
+/*
+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 && signal_pending(current)) {
+				--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 = 20; n > 0; --n) {
+		if (signal_pending(current)) {
+			err = -EINTR;
+			break;
+		}
+		swim3_select(fs, RELAX);
+		current->state = TASK_INTERRUPTIBLE;
+		schedule_timeout(1);
+		if (swim3_readbit(fs, DISK_IN) == 0)
+			break;
+	}
+	swim3_select(fs, RELAX);
+	udelay(150);
+	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 = inode->i_bdev->bd_disk->private_data;
+	int err;
+		
+	if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
+		return -ENXIO;
+
+	switch (cmd) {
+	case FDEJECT:
+		if (fs->ref_count != 1)
+			return -EBUSY;
+		err = fd_eject(fs);
+		return err;
+	case FDGETPRM:
+	        if (copy_to_user((void __user *) param, &floppy_type,
+				 sizeof(struct floppy_struct)))
+			return -EFAULT;
+		return 0;
+	}
+	return -ENOTTY;
+}
+
+static int floppy_open(struct inode *inode, struct file *filp)
+{
+	struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
+	struct swim3 __iomem *sw = fs->swim3;
+	int n, err = 0;
+
+	if (fs->ref_count == 0) {
+		if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
+			return -ENXIO;
+		out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
+		out_8(&sw->control_bic, 0xff);
+		out_8(&sw->mode, 0x95);
+		udelay(10);
+		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 = 0; n < 2 * HZ; ++n) {
+			if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
+				break;
+			if (signal_pending(current)) {
+				err = -EINTR;
+				break;
+			}
+			swim3_select(fs, RELAX);
+			current->state = TASK_INTERRUPTIBLE;
+			schedule_timeout(1);
+		}
+		if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
+				 || swim3_readbit(fs, DISK_IN) == 0))
+			err = -ENXIO;
+		swim3_action(fs, SETMFM);
+		swim3_select(fs, RELAX);
+
+	} else if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
+		return -EBUSY;
+
+	if (err == 0 && (filp->f_flags & O_NDELAY) == 0
+	    && (filp->f_mode & 3)) {
+		check_disk_change(inode->i_bdev);
+		if (fs->ejected)
+			err = -ENXIO;
+	}
+
+	if (err == 0 && (filp->f_mode & 2)) {
+		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);
+			swim3_select(fs, RELAX);
+		}
+		return err;
+	}
+
+	if (filp->f_flags & O_EXCL)
+		fs->ref_count = -1;
+	else
+		++fs->ref_count;
+
+	return 0;
+}
+
+static int floppy_release(struct inode *inode, struct file *filp)
+{
+	struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
+	struct swim3 __iomem *sw = fs->swim3;
+	if (fs->ref_count > 0 && --fs->ref_count == 0) {
+		swim3_action(fs, MOTOR_OFF);
+		out_8(&sw->control_bic, 0xff);
+		swim3_select(fs, RELAX);
+	}
+	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 swim3 __iomem *sw;
+	int ret, n;
+
+	if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
+		return -ENXIO;
+
+	sw = fs->swim3;
+	grab_drive(fs, revalidating, 0);
+	out_8(&sw->intr_enable, 0);
+	out_8(&sw->control_bis, DRIVE_ENABLE);
+	swim3_action(fs, MOTOR_ON);	/* necessary? */
+	fs->write_prot = -1;
+	fs->cur_cyl = -1;
+	mdelay(1);
+	for (n = HZ; n > 0; --n) {
+		if (swim3_readbit(fs, SEEK_COMPLETE))
+			break;
+		if (signal_pending(current))
+			break;
+		swim3_select(fs, RELAX);
+		current->state = TASK_INTERRUPTIBLE;
+		schedule_timeout(1);
+	}
+	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, SETMFM);
+	}
+	swim3_select(fs, RELAX);
+
+	release_drive(fs);
+	return ret;
+}
+
+static struct block_device_operations floppy_fops = {
+	.open		= floppy_open,
+	.release	= floppy_release,
+	.ioctl		= floppy_ioctl,
+	.media_changed	= floppy_check_change,
+	.revalidate_disk= floppy_revalidate,
+};
+
+int swim3_init(void)
+{
+	struct device_node *swim;
+	int err = -ENOMEM;
+	int i;
+
+	devfs_mk_dir("floppy");
+
+	swim = find_devices("floppy");
+	while (swim && (floppy_count < MAX_FLOPPIES))
+	{
+		swim3_add_device(swim);
+		swim = swim->next;
+	}
+
+	swim = find_devices("swim3");
+	while (swim && (floppy_count < MAX_FLOPPIES))
+	{
+		swim3_add_device(swim);
+		swim = swim->next;
+	}
+
+	if (!floppy_count)
+		return -ENODEV;
+
+	for (i = 0; i < floppy_count; i++) {
+		disks[i] = alloc_disk(1);
+		if (!disks[i])
+			goto out;
+	}
+
+	if (register_blkdev(FLOPPY_MAJOR, "fd")) {
+		err = -EBUSY;
+		goto out;
+	}
+
+	swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
+	if (!swim3_queue) {
+		err = -ENOMEM;
+		goto out_queue;
+	}
+
+	for (i = 0; i < floppy_count; i++) {
+		struct gendisk *disk = disks[i];
+		disk->major = FLOPPY_MAJOR;
+		disk->first_minor = i;
+		disk->fops = &floppy_fops;
+		disk->private_data = &floppy_states[i];
+		disk->queue = swim3_queue;
+		disk->flags |= GENHD_FL_REMOVABLE;
+		sprintf(disk->disk_name, "fd%d", i);
+		sprintf(disk->devfs_name, "floppy/%d", i);
+		set_capacity(disk, 2880);
+		add_disk(disk);
+	}
+	return 0;
+
+out_queue:
+	unregister_blkdev(FLOPPY_MAJOR, "fd");
+out:
+	while (i--)
+		put_disk(disks[i]);
+	/* shouldn't we do something with results of swim_add_device()? */
+	return err;
+}
+
+static int swim3_add_device(struct device_node *swim)
+{
+	struct device_node *mediabay;
+	struct floppy_state *fs = &floppy_states[floppy_count];
+
+	if (swim->n_addrs < 2)
+	{
+		printk(KERN_INFO "swim3: expecting 2 addrs (n_addrs:%d, n_intrs:%d)\n",
+		       swim->n_addrs, swim->n_intrs);
+		return -EINVAL;
+	}
+
+	if (swim->n_intrs < 2)
+	{
+		printk(KERN_INFO "swim3: expecting 2 intrs (n_addrs:%d, n_intrs:%d)\n",
+		       swim->n_addrs, swim->n_intrs);
+		return -EINVAL;
+	}
+
+	if (!request_OF_resource(swim, 0, NULL)) {
+		printk(KERN_INFO "swim3: can't request IO resource !\n");
+		return -EINVAL;
+	}
+
+	mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL;
+	if (mediabay == NULL)
+		pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
+	
+	memset(fs, 0, sizeof(*fs));
+	fs->state = idle;
+	fs->swim3 = (struct swim3 __iomem *)
+		ioremap(swim->addrs[0].address, 0x200);
+	fs->dma = (struct dbdma_regs __iomem *)
+		ioremap(swim->addrs[1].address, 0x200);
+	fs->swim3_intr = swim->intrs[0].line;
+	fs->dma_intr = swim->intrs[1].line;
+	fs->cur_cyl = -1;
+	fs->cur_sector = -1;
+	fs->secpercyl = 36;
+	fs->secpertrack = 18;
+	fs->total_secs = 2880;
+	fs->media_bay = mediabay;
+	init_waitqueue_head(&fs->wait);
+
+	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);
+		pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
+		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);
+		pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
+		return -EBUSY;
+	}
+*/
+
+	init_timer(&fs->timeout);
+
+	printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
+		mediabay ? "in media bay" : "");
+
+	floppy_count++;
+	
+	return 0;
+}
+
+module_init(swim3_init)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Paul Mackerras");
+MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);