Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1218 insertions, 0 deletions

diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
new file mode 100644
index 000000000..8c9d412b6
--- /dev/null
+++ b/drivers/s390/char/con3215.c
@@ -0,0 +1,1218 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 3215 line mode terminal driver.
+ *
+ * Copyright IBM Corp. 1999, 2009
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ *
+ * Updated:
+ *  Aug-2000: Added tab support
+ *	      Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
+ */
+
+#include <linux/types.h>
+#include <linux/kdev_t.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/vt_kern.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/reboot.h>
+#include <linux/serial.h> /* ASYNC_* flags */
+#include <linux/slab.h>
+#include <asm/ccwdev.h>
+#include <asm/cio.h>
+#include <asm/io.h>
+#include <asm/ebcdic.h>
+#include <linux/uaccess.h>
+#include <asm/delay.h>
+#include <asm/cpcmd.h>
+#include <asm/setup.h>
+
+#include "ctrlchar.h"
+
+#define NR_3215		    1
+#define NR_3215_REQ	    (4*NR_3215)
+#define RAW3215_BUFFER_SIZE 65536     /* output buffer size */
+#define RAW3215_INBUF_SIZE  256	      /* input buffer size */
+#define RAW3215_MIN_SPACE   128	      /* minimum free space for wakeup */
+#define RAW3215_MIN_WRITE   1024      /* min. length for immediate output */
+#define RAW3215_MAX_BYTES   3968      /* max. bytes to write with one ssch */
+#define RAW3215_MAX_NEWLINE 50	      /* max. lines to write with one ssch */
+#define RAW3215_NR_CCWS	    3
+#define RAW3215_TIMEOUT	    HZ/10     /* time for delayed output */
+
+#define RAW3215_FIXED	    1	      /* 3215 console device is not be freed */
+#define RAW3215_WORKING	    4	      /* set if a request is being worked on */
+#define RAW3215_THROTTLED   8	      /* set if reading is disabled */
+#define RAW3215_STOPPED	    16	      /* set if writing is disabled */
+#define RAW3215_TIMER_RUNS  64	      /* set if the output delay timer is on */
+#define RAW3215_FLUSHING    128	      /* set to flush buffer (no delay) */
+
+#define TAB_STOP_SIZE	    8	      /* tab stop size */
+
+/*
+ * Request types for a 3215 device
+ */
+enum raw3215_type {
+	RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
+};
+
+/*
+ * Request structure for a 3215 device
+ */
+struct raw3215_req {
+	enum raw3215_type type;	      /* type of the request */
+	int start, len;		      /* start index & len in output buffer */
+	int delayable;		      /* indication to wait for more data */
+	int residual;		      /* residual count for read request */
+	struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
+	struct raw3215_info *info;    /* pointer to main structure */
+	struct raw3215_req *next;     /* pointer to next request */
+} __attribute__ ((aligned(8)));
+
+struct raw3215_info {
+	struct tty_port port;
+	struct ccw_device *cdev;      /* device for tty driver */
+	spinlock_t *lock;	      /* pointer to irq lock */
+	int flags;		      /* state flags */
+	char *buffer;		      /* pointer to output buffer */
+	char *inbuf;		      /* pointer to input buffer */
+	int head;		      /* first free byte in output buffer */
+	int count;		      /* number of bytes in output buffer */
+	int written;		      /* number of bytes in write requests */
+	struct raw3215_req *queued_read; /* pointer to queued read requests */
+	struct raw3215_req *queued_write;/* pointer to queued write requests */
+	struct tasklet_struct tlet;   /* tasklet to invoke tty_wakeup */
+	wait_queue_head_t empty_wait; /* wait queue for flushing */
+	struct timer_list timer;      /* timer for delayed output */
+	int line_pos;		      /* position on the line (for tabs) */
+	char ubuffer[80];	      /* copy_from_user buffer */
+};
+
+/* array of 3215 devices structures */
+static struct raw3215_info *raw3215[NR_3215];
+/* spinlock to protect the raw3215 array */
+static DEFINE_SPINLOCK(raw3215_device_lock);
+/* list of free request structures */
+static struct raw3215_req *raw3215_freelist;
+/* spinlock to protect free list */
+static spinlock_t raw3215_freelist_lock;
+
+static struct tty_driver *tty3215_driver;
+
+/*
+ * Get a request structure from the free list
+ */
+static inline struct raw3215_req *raw3215_alloc_req(void)
+{
+	struct raw3215_req *req;
+	unsigned long flags;
+
+	spin_lock_irqsave(&raw3215_freelist_lock, flags);
+	req = raw3215_freelist;
+	raw3215_freelist = req->next;
+	spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
+	return req;
+}
+
+/*
+ * Put a request structure back to the free list
+ */
+static inline void raw3215_free_req(struct raw3215_req *req)
+{
+	unsigned long flags;
+
+	if (req->type == RAW3215_FREE)
+		return;		/* don't free a free request */
+	req->type = RAW3215_FREE;
+	spin_lock_irqsave(&raw3215_freelist_lock, flags);
+	req->next = raw3215_freelist;
+	raw3215_freelist = req;
+	spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
+}
+
+/*
+ * Set up a read request that reads up to 160 byte from the 3215 device.
+ * If there is a queued read request it is used, but that shouldn't happen
+ * because a 3215 terminal won't accept a new read before the old one is
+ * completed.
+ */
+static void raw3215_mk_read_req(struct raw3215_info *raw)
+{
+	struct raw3215_req *req;
+	struct ccw1 *ccw;
+
+	/* there can only be ONE read request at a time */
+	req = raw->queued_read;
+	if (req == NULL) {
+		/* no queued read request, use new req structure */
+		req = raw3215_alloc_req();
+		req->type = RAW3215_READ;
+		req->info = raw;
+		raw->queued_read = req;
+	}
+
+	ccw = req->ccws;
+	ccw->cmd_code = 0x0A; /* read inquiry */
+	ccw->flags = 0x20;    /* ignore incorrect length */
+	ccw->count = 160;
+	ccw->cda = (__u32) __pa(raw->inbuf);
+}
+
+/*
+ * Set up a write request with the information from the main structure.
+ * A ccw chain is created that writes as much as possible from the output
+ * buffer to the 3215 device. If a queued write exists it is replaced by
+ * the new, probably lengthened request.
+ */
+static void raw3215_mk_write_req(struct raw3215_info *raw)
+{
+	struct raw3215_req *req;
+	struct ccw1 *ccw;
+	int len, count, ix, lines;
+
+	if (raw->count <= raw->written)
+		return;
+	/* check if there is a queued write request */
+	req = raw->queued_write;
+	if (req == NULL) {
+		/* no queued write request, use new req structure */
+		req = raw3215_alloc_req();
+		req->type = RAW3215_WRITE;
+		req->info = raw;
+		raw->queued_write = req;
+	} else {
+		raw->written -= req->len;
+	}
+
+	ccw = req->ccws;
+	req->start = (raw->head - raw->count + raw->written) &
+		     (RAW3215_BUFFER_SIZE - 1);
+	/*
+	 * now we have to count newlines. We can at max accept
+	 * RAW3215_MAX_NEWLINE newlines in a single ssch due to
+	 * a restriction in VM
+	 */
+	lines = 0;
+	ix = req->start;
+	while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
+		if (raw->buffer[ix] == 0x15)
+			lines++;
+		ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
+	}
+	len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
+	if (len > RAW3215_MAX_BYTES)
+		len = RAW3215_MAX_BYTES;
+	req->len = len;
+	raw->written += len;
+
+	/* set the indication if we should try to enlarge this request */
+	req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
+
+	ix = req->start;
+	while (len > 0) {
+		if (ccw > req->ccws)
+			ccw[-1].flags |= 0x40; /* use command chaining */
+		ccw->cmd_code = 0x01; /* write, auto carrier return */
+		ccw->flags = 0x20;    /* ignore incorrect length ind.  */
+		ccw->cda =
+			(__u32) __pa(raw->buffer + ix);
+		count = len;
+		if (ix + count > RAW3215_BUFFER_SIZE)
+			count = RAW3215_BUFFER_SIZE - ix;
+		ccw->count = count;
+		len -= count;
+		ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
+		ccw++;
+	}
+	/*
+	 * Add a NOP to the channel program. 3215 devices are purely
+	 * emulated and its much better to avoid the channel end
+	 * interrupt in this case.
+	 */
+	if (ccw > req->ccws)
+		ccw[-1].flags |= 0x40; /* use command chaining */
+	ccw->cmd_code = 0x03; /* NOP */
+	ccw->flags = 0;
+	ccw->cda = 0;
+	ccw->count = 1;
+}
+
+/*
+ * Start a read or a write request
+ */
+static void raw3215_start_io(struct raw3215_info *raw)
+{
+	struct raw3215_req *req;
+	int res;
+
+	req = raw->queued_read;
+	if (req != NULL &&
+	    !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
+		/* dequeue request */
+		raw->queued_read = NULL;
+		res = ccw_device_start(raw->cdev, req->ccws,
+				       (unsigned long) req, 0, 0);
+		if (res != 0) {
+			/* do_IO failed, put request back to queue */
+			raw->queued_read = req;
+		} else {
+			raw->flags |= RAW3215_WORKING;
+		}
+	}
+	req = raw->queued_write;
+	if (req != NULL &&
+	    !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
+		/* dequeue request */
+		raw->queued_write = NULL;
+		res = ccw_device_start(raw->cdev, req->ccws,
+				       (unsigned long) req, 0, 0);
+		if (res != 0) {
+			/* do_IO failed, put request back to queue */
+			raw->queued_write = req;
+		} else {
+			raw->flags |= RAW3215_WORKING;
+		}
+	}
+}
+
+/*
+ * Function to start a delayed output after RAW3215_TIMEOUT seconds
+ */
+static void raw3215_timeout(struct timer_list *t)
+{
+	struct raw3215_info *raw = from_timer(raw, t, timer);
+	unsigned long flags;
+
+	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+	raw->flags &= ~RAW3215_TIMER_RUNS;
+	if (!tty_port_suspended(&raw->port)) {
+		raw3215_mk_write_req(raw);
+		raw3215_start_io(raw);
+		if ((raw->queued_read || raw->queued_write) &&
+		    !(raw->flags & RAW3215_WORKING) &&
+		    !(raw->flags & RAW3215_TIMER_RUNS)) {
+			raw->timer.expires = RAW3215_TIMEOUT + jiffies;
+			add_timer(&raw->timer);
+			raw->flags |= RAW3215_TIMER_RUNS;
+		}
+	}
+	spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+}
+
+/*
+ * Function to conditionally start an IO. A read is started immediately,
+ * a write is only started immediately if the flush flag is on or the
+ * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
+ * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
+ */
+static inline void raw3215_try_io(struct raw3215_info *raw)
+{
+	if (!tty_port_initialized(&raw->port) || tty_port_suspended(&raw->port))
+		return;
+	if (raw->queued_read != NULL)
+		raw3215_start_io(raw);
+	else if (raw->queued_write != NULL) {
+		if ((raw->queued_write->delayable == 0) ||
+		    (raw->flags & RAW3215_FLUSHING)) {
+			/* execute write requests bigger than minimum size */
+			raw3215_start_io(raw);
+		}
+	}
+	if ((raw->queued_read || raw->queued_write) &&
+	    !(raw->flags & RAW3215_WORKING) &&
+	    !(raw->flags & RAW3215_TIMER_RUNS)) {
+		raw->timer.expires = RAW3215_TIMEOUT + jiffies;
+		add_timer(&raw->timer);
+		raw->flags |= RAW3215_TIMER_RUNS;
+	}
+}
+
+/*
+ * Call tty_wakeup from tasklet context
+ */
+static void raw3215_wakeup(unsigned long data)
+{
+	struct raw3215_info *raw = (struct raw3215_info *) data;
+	struct tty_struct *tty;
+
+	tty = tty_port_tty_get(&raw->port);
+	if (tty) {
+		tty_wakeup(tty);
+		tty_kref_put(tty);
+	}
+}
+
+/*
+ * Try to start the next IO and wake up processes waiting on the tty.
+ */
+static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
+{
+	raw3215_mk_write_req(raw);
+	raw3215_try_io(raw);
+	if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
+		tasklet_schedule(&raw->tlet);
+}
+
+/*
+ * Interrupt routine, called from common io layer
+ */
+static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
+			struct irb *irb)
+{
+	struct raw3215_info *raw;
+	struct raw3215_req *req;
+	struct tty_struct *tty;
+	int cstat, dstat;
+	int count;
+
+	raw = dev_get_drvdata(&cdev->dev);
+	req = (struct raw3215_req *) intparm;
+	tty = tty_port_tty_get(&raw->port);
+	cstat = irb->scsw.cmd.cstat;
+	dstat = irb->scsw.cmd.dstat;
+	if (cstat != 0)
+		raw3215_next_io(raw, tty);
+	if (dstat & 0x01) { /* we got a unit exception */
+		dstat &= ~0x01;	 /* we can ignore it */
+	}
+	switch (dstat) {
+	case 0x80:
+		if (cstat != 0)
+			break;
+		/* Attention interrupt, someone hit the enter key */
+		raw3215_mk_read_req(raw);
+		raw3215_next_io(raw, tty);
+		break;
+	case 0x08:
+	case 0x0C:
+		/* Channel end interrupt. */
+		if ((raw = req->info) == NULL)
+			goto put_tty;	     /* That shouldn't happen ... */
+		if (req->type == RAW3215_READ) {
+			/* store residual count, then wait for device end */
+			req->residual = irb->scsw.cmd.count;
+		}
+		if (dstat == 0x08)
+			break;
+	case 0x04:
+		/* Device end interrupt. */
+		if ((raw = req->info) == NULL)
+			goto put_tty;	     /* That shouldn't happen ... */
+		if (req->type == RAW3215_READ && tty != NULL) {
+			unsigned int cchar;
+
+			count = 160 - req->residual;
+			EBCASC(raw->inbuf, count);
+			cchar = ctrlchar_handle(raw->inbuf, count, tty);
+			switch (cchar & CTRLCHAR_MASK) {
+			case CTRLCHAR_SYSRQ:
+				break;
+
+			case CTRLCHAR_CTRL:
+				tty_insert_flip_char(&raw->port, cchar,
+						TTY_NORMAL);
+				tty_flip_buffer_push(&raw->port);
+				break;
+
+			case CTRLCHAR_NONE:
+				if (count < 2 ||
+				    (strncmp(raw->inbuf+count-2, "\252n", 2) &&
+				     strncmp(raw->inbuf+count-2, "^n", 2)) ) {
+					/* add the auto \n */
+					raw->inbuf[count] = '\n';
+					count++;
+				} else
+					count -= 2;
+				tty_insert_flip_string(&raw->port, raw->inbuf,
+						count);
+				tty_flip_buffer_push(&raw->port);
+				break;
+			}
+		} else if (req->type == RAW3215_WRITE) {
+			raw->count -= req->len;
+			raw->written -= req->len;
+		}
+		raw->flags &= ~RAW3215_WORKING;
+		raw3215_free_req(req);
+		/* check for empty wait */
+		if (waitqueue_active(&raw->empty_wait) &&
+		    raw->queued_write == NULL &&
+		    raw->queued_read == NULL) {
+			wake_up_interruptible(&raw->empty_wait);
+		}
+		raw3215_next_io(raw, tty);
+		break;
+	default:
+		/* Strange interrupt, I'll do my best to clean up */
+		if (req != NULL && req->type != RAW3215_FREE) {
+			if (req->type == RAW3215_WRITE) {
+				raw->count -= req->len;
+				raw->written -= req->len;
+			}
+			raw->flags &= ~RAW3215_WORKING;
+			raw3215_free_req(req);
+		}
+		raw3215_next_io(raw, tty);
+	}
+put_tty:
+	tty_kref_put(tty);
+}
+
+/*
+ * Drop the oldest line from the output buffer.
+ */
+static void raw3215_drop_line(struct raw3215_info *raw)
+{
+	int ix;
+	char ch;
+
+	BUG_ON(raw->written != 0);
+	ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
+	while (raw->count > 0) {
+		ch = raw->buffer[ix];
+		ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
+		raw->count--;
+		if (ch == 0x15)
+			break;
+	}
+	raw->head = ix;
+}
+
+/*
+ * Wait until length bytes are available int the output buffer.
+ * Has to be called with the s390irq lock held. Can be called
+ * disabled.
+ */
+static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
+{
+	while (RAW3215_BUFFER_SIZE - raw->count < length) {
+		/* While console is frozen for suspend we have no other
+		 * choice but to drop message from the buffer to make
+		 * room for even more messages. */
+		if (tty_port_suspended(&raw->port)) {
+			raw3215_drop_line(raw);
+			continue;
+		}
+		/* there might be a request pending */
+		raw->flags |= RAW3215_FLUSHING;
+		raw3215_mk_write_req(raw);
+		raw3215_try_io(raw);
+		raw->flags &= ~RAW3215_FLUSHING;
+#ifdef CONFIG_TN3215_CONSOLE
+		ccw_device_wait_idle(raw->cdev);
+#endif
+		/* Enough room freed up ? */
+		if (RAW3215_BUFFER_SIZE - raw->count >= length)
+			break;
+		/* there might be another cpu waiting for the lock */
+		spin_unlock(get_ccwdev_lock(raw->cdev));
+		udelay(100);
+		spin_lock(get_ccwdev_lock(raw->cdev));
+	}
+}
+
+/*
+ * String write routine for 3215 devices
+ */
+static void raw3215_write(struct raw3215_info *raw, const char *str,
+			  unsigned int length)
+{
+	unsigned long flags;
+	int c, count;
+
+	while (length > 0) {
+		spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+		count = (length > RAW3215_BUFFER_SIZE) ?
+					     RAW3215_BUFFER_SIZE : length;
+		length -= count;
+
+		raw3215_make_room(raw, count);
+
+		/* copy string to output buffer and convert it to EBCDIC */
+		while (1) {
+			c = min_t(int, count,
+				  min(RAW3215_BUFFER_SIZE - raw->count,
+				      RAW3215_BUFFER_SIZE - raw->head));
+			if (c <= 0)
+				break;
+			memcpy(raw->buffer + raw->head, str, c);
+			ASCEBC(raw->buffer + raw->head, c);
+			raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
+			raw->count += c;
+			raw->line_pos += c;
+			str += c;
+			count -= c;
+		}
+		if (!(raw->flags & RAW3215_WORKING)) {
+			raw3215_mk_write_req(raw);
+			/* start or queue request */
+			raw3215_try_io(raw);
+		}
+		spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+	}
+}
+
+/*
+ * Put character routine for 3215 devices
+ */
+static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
+{
+	unsigned long flags;
+	unsigned int length, i;
+
+	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+	if (ch == '\t') {
+		length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
+		raw->line_pos += length;
+		ch = ' ';
+	} else if (ch == '\n') {
+		length = 1;
+		raw->line_pos = 0;
+	} else {
+		length = 1;
+		raw->line_pos++;
+	}
+	raw3215_make_room(raw, length);
+
+	for (i = 0; i < length; i++) {
+		raw->buffer[raw->head] = (char) _ascebc[(int) ch];
+		raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
+		raw->count++;
+	}
+	if (!(raw->flags & RAW3215_WORKING)) {
+		raw3215_mk_write_req(raw);
+		/* start or queue request */
+		raw3215_try_io(raw);
+	}
+	spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+}
+
+/*
+ * Flush routine, it simply sets the flush flag and tries to start
+ * pending IO.
+ */
+static void raw3215_flush_buffer(struct raw3215_info *raw)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+	if (raw->count > 0) {
+		raw->flags |= RAW3215_FLUSHING;
+		raw3215_try_io(raw);
+		raw->flags &= ~RAW3215_FLUSHING;
+	}
+	spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+}
+
+/*
+ * Fire up a 3215 device.
+ */
+static int raw3215_startup(struct raw3215_info *raw)
+{
+	unsigned long flags;
+
+	if (tty_port_initialized(&raw->port))
+		return 0;
+	raw->line_pos = 0;
+	tty_port_set_initialized(&raw->port, 1);
+	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+	raw3215_try_io(raw);
+	spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+
+	return 0;
+}
+
+/*
+ * Shutdown a 3215 device.
+ */
+static void raw3215_shutdown(struct raw3215_info *raw)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	unsigned long flags;
+
+	if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED))
+		return;
+	/* Wait for outstanding requests, then free irq */
+	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+	if ((raw->flags & RAW3215_WORKING) ||
+	    raw->queued_write != NULL ||
+	    raw->queued_read != NULL) {
+		add_wait_queue(&raw->empty_wait, &wait);
+		set_current_state(TASK_INTERRUPTIBLE);
+		spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+		schedule();
+		spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+		remove_wait_queue(&raw->empty_wait, &wait);
+		set_current_state(TASK_RUNNING);
+		tty_port_set_initialized(&raw->port, 1);
+	}
+	spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+}
+
+static struct raw3215_info *raw3215_alloc_info(void)
+{
+	struct raw3215_info *info;
+
+	info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
+	if (!info)
+		return NULL;
+
+	info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
+	info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
+	if (!info->buffer || !info->inbuf) {
+		kfree(info->inbuf);
+		kfree(info->buffer);
+		kfree(info);
+		return NULL;
+	}
+
+	timer_setup(&info->timer, raw3215_timeout, 0);
+	init_waitqueue_head(&info->empty_wait);
+	tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
+	tty_port_init(&info->port);
+
+	return info;
+}
+
+static void raw3215_free_info(struct raw3215_info *raw)
+{
+	kfree(raw->inbuf);
+	kfree(raw->buffer);
+	tty_port_destroy(&raw->port);
+	kfree(raw);
+}
+
+static int raw3215_probe (struct ccw_device *cdev)
+{
+	struct raw3215_info *raw;
+	int line;
+
+	/* Console is special. */
+	if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
+		return 0;
+
+	raw = raw3215_alloc_info();
+	if (raw == NULL)
+		return -ENOMEM;
+
+	raw->cdev = cdev;
+	dev_set_drvdata(&cdev->dev, raw);
+	cdev->handler = raw3215_irq;
+
+	spin_lock(&raw3215_device_lock);
+	for (line = 0; line < NR_3215; line++) {
+		if (!raw3215[line]) {
+			raw3215[line] = raw;
+			break;
+		}
+	}
+	spin_unlock(&raw3215_device_lock);
+	if (line == NR_3215) {
+		raw3215_free_info(raw);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void raw3215_remove (struct ccw_device *cdev)
+{
+	struct raw3215_info *raw;
+	unsigned int line;
+
+	ccw_device_set_offline(cdev);
+	raw = dev_get_drvdata(&cdev->dev);
+	if (raw) {
+		spin_lock(&raw3215_device_lock);
+		for (line = 0; line < NR_3215; line++)
+			if (raw3215[line] == raw)
+				break;
+		raw3215[line] = NULL;
+		spin_unlock(&raw3215_device_lock);
+		dev_set_drvdata(&cdev->dev, NULL);
+		raw3215_free_info(raw);
+	}
+}
+
+static int raw3215_set_online (struct ccw_device *cdev)
+{
+	struct raw3215_info *raw;
+
+	raw = dev_get_drvdata(&cdev->dev);
+	if (!raw)
+		return -ENODEV;
+
+	return raw3215_startup(raw);
+}
+
+static int raw3215_set_offline (struct ccw_device *cdev)
+{
+	struct raw3215_info *raw;
+
+	raw = dev_get_drvdata(&cdev->dev);
+	if (!raw)
+		return -ENODEV;
+
+	raw3215_shutdown(raw);
+
+	return 0;
+}
+
+static int raw3215_pm_stop(struct ccw_device *cdev)
+{
+	struct raw3215_info *raw;
+	unsigned long flags;
+
+	/* Empty the output buffer, then prevent new I/O. */
+	raw = dev_get_drvdata(&cdev->dev);
+	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+	raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
+	tty_port_set_suspended(&raw->port, 1);
+	spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+	return 0;
+}
+
+static int raw3215_pm_start(struct ccw_device *cdev)
+{
+	struct raw3215_info *raw;
+	unsigned long flags;
+
+	/* Allow I/O again and flush output buffer. */
+	raw = dev_get_drvdata(&cdev->dev);
+	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+	tty_port_set_suspended(&raw->port, 0);
+	raw->flags |= RAW3215_FLUSHING;
+	raw3215_try_io(raw);
+	raw->flags &= ~RAW3215_FLUSHING;
+	spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+	return 0;
+}
+
+static struct ccw_device_id raw3215_id[] = {
+	{ CCW_DEVICE(0x3215, 0) },
+	{ /* end of list */ },
+};
+
+static struct ccw_driver raw3215_ccw_driver = {
+	.driver = {
+		.name	= "3215",
+		.owner	= THIS_MODULE,
+	},
+	.ids		= raw3215_id,
+	.probe		= &raw3215_probe,
+	.remove		= &raw3215_remove,
+	.set_online	= &raw3215_set_online,
+	.set_offline	= &raw3215_set_offline,
+	.freeze		= &raw3215_pm_stop,
+	.thaw		= &raw3215_pm_start,
+	.restore	= &raw3215_pm_start,
+	.int_class	= IRQIO_C15,
+};
+
+#ifdef CONFIG_TN3215_CONSOLE
+/*
+ * Write a string to the 3215 console
+ */
+static void con3215_write(struct console *co, const char *str,
+			  unsigned int count)
+{
+	struct raw3215_info *raw;
+	int i;
+
+	if (count <= 0)
+		return;
+	raw = raw3215[0];	/* console 3215 is the first one */
+	while (count > 0) {
+		for (i = 0; i < count; i++)
+			if (str[i] == '\t' || str[i] == '\n')
+				break;
+		raw3215_write(raw, str, i);
+		count -= i;
+		str += i;
+		if (count > 0) {
+			raw3215_putchar(raw, *str);
+			count--;
+			str++;
+		}
+	}
+}
+
+static struct tty_driver *con3215_device(struct console *c, int *index)
+{
+	*index = c->index;
+	return tty3215_driver;
+}
+
+/*
+ * panic() calls con3215_flush through a panic_notifier
+ * before the system enters a disabled, endless loop.
+ */
+static void con3215_flush(void)
+{
+	struct raw3215_info *raw;
+	unsigned long flags;
+
+	raw = raw3215[0];  /* console 3215 is the first one */
+	if (tty_port_suspended(&raw->port))
+		/* The console is still frozen for suspend. */
+		if (ccw_device_force_console(raw->cdev))
+			/* Forcing didn't work, no panic message .. */
+			return;
+	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+	raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
+	spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+}
+
+static int con3215_notify(struct notifier_block *self,
+			  unsigned long event, void *data)
+{
+	con3215_flush();
+	return NOTIFY_OK;
+}
+
+static struct notifier_block on_panic_nb = {
+	.notifier_call = con3215_notify,
+	.priority = 0,
+};
+
+static struct notifier_block on_reboot_nb = {
+	.notifier_call = con3215_notify,
+	.priority = 0,
+};
+
+/*
+ *  The console structure for the 3215 console
+ */
+static struct console con3215 = {
+	.name	 = "ttyS",
+	.write	 = con3215_write,
+	.device	 = con3215_device,
+	.flags	 = CON_PRINTBUFFER,
+};
+
+/*
+ * 3215 console initialization code called from console_init().
+ */
+static int __init con3215_init(void)
+{
+	struct ccw_device *cdev;
+	struct raw3215_info *raw;
+	struct raw3215_req *req;
+	int i;
+
+	/* Check if 3215 is to be the console */
+	if (!CONSOLE_IS_3215)
+		return -ENODEV;
+
+	/* Set the console mode for VM */
+	if (MACHINE_IS_VM) {
+		cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
+		cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
+	}
+
+	/* allocate 3215 request structures */
+	raw3215_freelist = NULL;
+	spin_lock_init(&raw3215_freelist_lock);
+	for (i = 0; i < NR_3215_REQ; i++) {
+		req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
+		if (!req)
+			return -ENOMEM;
+		req->next = raw3215_freelist;
+		raw3215_freelist = req;
+	}
+
+	cdev = ccw_device_create_console(&raw3215_ccw_driver);
+	if (IS_ERR(cdev))
+		return -ENODEV;
+
+	raw3215[0] = raw = raw3215_alloc_info();
+	raw->cdev = cdev;
+	dev_set_drvdata(&cdev->dev, raw);
+	cdev->handler = raw3215_irq;
+
+	raw->flags |= RAW3215_FIXED;
+	if (ccw_device_enable_console(cdev)) {
+		ccw_device_destroy_console(cdev);
+		raw3215_free_info(raw);
+		raw3215[0] = NULL;
+		return -ENODEV;
+	}
+
+	/* Request the console irq */
+	if (raw3215_startup(raw) != 0) {
+		raw3215_free_info(raw);
+		raw3215[0] = NULL;
+		return -ENODEV;
+	}
+	atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
+	register_reboot_notifier(&on_reboot_nb);
+	register_console(&con3215);
+	return 0;
+}
+console_initcall(con3215_init);
+#endif
+
+static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+	struct raw3215_info *raw;
+
+	raw = raw3215[tty->index];
+	if (raw == NULL)
+		return -ENODEV;
+
+	tty->driver_data = raw;
+
+	return tty_port_install(&raw->port, driver, tty);
+}
+
+/*
+ * tty3215_open
+ *
+ * This routine is called whenever a 3215 tty is opened.
+ */
+static int tty3215_open(struct tty_struct *tty, struct file * filp)
+{
+	struct raw3215_info *raw = tty->driver_data;
+	int retval;
+
+	tty_port_tty_set(&raw->port, tty);
+
+	raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
+	/*
+	 * Start up 3215 device
+	 */
+	retval = raw3215_startup(raw);
+	if (retval)
+		return retval;
+
+	return 0;
+}
+
+/*
+ * tty3215_close()
+ *
+ * This routine is called when the 3215 tty is closed. We wait
+ * for the remaining request to be completed. Then we clean up.
+ */
+static void tty3215_close(struct tty_struct *tty, struct file * filp)
+{
+	struct raw3215_info *raw;
+
+	raw = (struct raw3215_info *) tty->driver_data;
+	if (raw == NULL || tty->count > 1)
+		return;
+	tty->closing = 1;
+	/* Shutdown the terminal */
+	raw3215_shutdown(raw);
+	tasklet_kill(&raw->tlet);
+	tty->closing = 0;
+	tty_port_tty_set(&raw->port, NULL);
+}
+
+/*
+ * Returns the amount of free space in the output buffer.
+ */
+static int tty3215_write_room(struct tty_struct *tty)
+{
+	struct raw3215_info *raw;
+
+	raw = (struct raw3215_info *) tty->driver_data;
+
+	/* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
+	if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
+		return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
+	else
+		return 0;
+}
+
+/*
+ * String write routine for 3215 ttys
+ */
+static int tty3215_write(struct tty_struct * tty,
+			 const unsigned char *buf, int count)
+{
+	struct raw3215_info *raw;
+	int i, written;
+
+	if (!tty)
+		return 0;
+	raw = (struct raw3215_info *) tty->driver_data;
+	written = count;
+	while (count > 0) {
+		for (i = 0; i < count; i++)
+			if (buf[i] == '\t' || buf[i] == '\n')
+				break;
+		raw3215_write(raw, buf, i);
+		count -= i;
+		buf += i;
+		if (count > 0) {
+			raw3215_putchar(raw, *buf);
+			count--;
+			buf++;
+		}
+	}
+	return written;
+}
+
+/*
+ * Put character routine for 3215 ttys
+ */
+static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	struct raw3215_info *raw;
+
+	if (!tty)
+		return 0;
+	raw = (struct raw3215_info *) tty->driver_data;
+	raw3215_putchar(raw, ch);
+	return 1;
+}
+
+static void tty3215_flush_chars(struct tty_struct *tty)
+{
+}
+
+/*
+ * Returns the number of characters in the output buffer
+ */
+static int tty3215_chars_in_buffer(struct tty_struct *tty)
+{
+	struct raw3215_info *raw;
+
+	raw = (struct raw3215_info *) tty->driver_data;
+	return raw->count;
+}
+
+static void tty3215_flush_buffer(struct tty_struct *tty)
+{
+	struct raw3215_info *raw;
+
+	raw = (struct raw3215_info *) tty->driver_data;
+	raw3215_flush_buffer(raw);
+	tty_wakeup(tty);
+}
+
+/*
+ * Disable reading from a 3215 tty
+ */
+static void tty3215_throttle(struct tty_struct * tty)
+{
+	struct raw3215_info *raw;
+
+	raw = (struct raw3215_info *) tty->driver_data;
+	raw->flags |= RAW3215_THROTTLED;
+}
+
+/*
+ * Enable reading from a 3215 tty
+ */
+static void tty3215_unthrottle(struct tty_struct * tty)
+{
+	struct raw3215_info *raw;
+	unsigned long flags;
+
+	raw = (struct raw3215_info *) tty->driver_data;
+	if (raw->flags & RAW3215_THROTTLED) {
+		spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+		raw->flags &= ~RAW3215_THROTTLED;
+		raw3215_try_io(raw);
+		spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+	}
+}
+
+/*
+ * Disable writing to a 3215 tty
+ */
+static void tty3215_stop(struct tty_struct *tty)
+{
+	struct raw3215_info *raw;
+
+	raw = (struct raw3215_info *) tty->driver_data;
+	raw->flags |= RAW3215_STOPPED;
+}
+
+/*
+ * Enable writing to a 3215 tty
+ */
+static void tty3215_start(struct tty_struct *tty)
+{
+	struct raw3215_info *raw;
+	unsigned long flags;
+
+	raw = (struct raw3215_info *) tty->driver_data;
+	if (raw->flags & RAW3215_STOPPED) {
+		spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+		raw->flags &= ~RAW3215_STOPPED;
+		raw3215_try_io(raw);
+		spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+	}
+}
+
+static const struct tty_operations tty3215_ops = {
+	.install = tty3215_install,
+	.open = tty3215_open,
+	.close = tty3215_close,
+	.write = tty3215_write,
+	.put_char = tty3215_put_char,
+	.flush_chars = tty3215_flush_chars,
+	.write_room = tty3215_write_room,
+	.chars_in_buffer = tty3215_chars_in_buffer,
+	.flush_buffer = tty3215_flush_buffer,
+	.throttle = tty3215_throttle,
+	.unthrottle = tty3215_unthrottle,
+	.stop = tty3215_stop,
+	.start = tty3215_start,
+};
+
+/*
+ * 3215 tty registration code called from tty_init().
+ * Most kernel services (incl. kmalloc) are available at this poimt.
+ */
+static int __init tty3215_init(void)
+{
+	struct tty_driver *driver;
+	int ret;
+
+	if (!CONSOLE_IS_3215)
+		return 0;
+
+	driver = alloc_tty_driver(NR_3215);
+	if (!driver)
+		return -ENOMEM;
+
+	ret = ccw_driver_register(&raw3215_ccw_driver);
+	if (ret) {
+		put_tty_driver(driver);
+		return ret;
+	}
+	/*
+	 * Initialize the tty_driver structure
+	 * Entries in tty3215_driver that are NOT initialized:
+	 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
+	 */
+
+	driver->driver_name = "tty3215";
+	driver->name = "ttyS";
+	driver->major = TTY_MAJOR;
+	driver->minor_start = 64;
+	driver->type = TTY_DRIVER_TYPE_SYSTEM;
+	driver->subtype = SYSTEM_TYPE_TTY;
+	driver->init_termios = tty_std_termios;
+	driver->init_termios.c_iflag = IGNBRK | IGNPAR;
+	driver->init_termios.c_oflag = ONLCR;
+	driver->init_termios.c_lflag = ISIG;
+	driver->flags = TTY_DRIVER_REAL_RAW;
+	tty_set_operations(driver, &tty3215_ops);
+	ret = tty_register_driver(driver);
+	if (ret) {
+		put_tty_driver(driver);
+		return ret;
+	}
+	tty3215_driver = driver;
+	return 0;
+}
+device_initcall(tty3215_init);