1 files changed, 1936 insertions, 395 deletions

diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index 10f6a37fb153..d9983550062d 100644
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -1,518 +1,2075 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * IBM/3270 Driver - console view.
+ *    IBM/3270 Driver - tty functions.
  *
- * Author(s):
- *   Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
- *   Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
- *     Copyright IBM Corp. 2003, 2009
+ *  Author(s):
+ *    Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
+ *    Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
+ *	-- Copyright IBM Corp. 2003
  */
 
 #include <linux/module.h>
-#include <linux/console.h>
+#include <linux/types.h>
+#include <linux/kdev_t.h>
+#include <linux/tty.h>
+#include <linux/vt_kern.h>
 #include <linux/init.h>
+#include <linux/console.h>
 #include <linux/interrupt.h>
-#include <linux/list.h>
+#include <linux/workqueue.h>
 #include <linux/panic_notifier.h>
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/err.h>
 #include <linux/reboot.h>
+#include <linux/slab.h>
+#include <linux/memblock.h>
+#include <linux/compat.h>
 
 #include <asm/ccwdev.h>
 #include <asm/cio.h>
-#include <asm/cpcmd.h>
 #include <asm/ebcdic.h>
+#include <asm/cpcmd.h>
+#include <linux/uaccess.h>
 
 #include "raw3270.h"
-#include "tty3270.h"
-#include "ctrlchar.h"
+#include "keyboard.h"
+
+#define TTY3270_CHAR_BUF_SIZE 256
+#define TTY3270_OUTPUT_BUFFER_SIZE 4096
+#define TTY3270_SCREEN_PAGES 8 /* has to be power-of-two */
+#define TTY3270_RECALL_SIZE 16 /* has to be power-of-two */
+#define TTY3270_STATUS_AREA_SIZE 40
+
+static struct tty_driver *tty3270_driver;
+static int tty3270_max_index;
+static struct raw3270_fn tty3270_fn;
+
+#define TTY3270_HIGHLIGHT_BLINK		1
+#define TTY3270_HIGHLIGHT_REVERSE	2
+#define TTY3270_HIGHLIGHT_UNDERSCORE	4
+
+struct tty3270_attribute {
+	unsigned char alternate_charset:1;	/* Graphics charset */
+	unsigned char highlight:3;		/* Blink/reverse/underscore */
+	unsigned char f_color:4;		/* Foreground color */
+	unsigned char b_color:4;		/* Background color */
+};
 
-#define CON3270_OUTPUT_BUFFER_SIZE 1024
-#define CON3270_STRING_PAGES 4
+struct tty3270_cell {
+	unsigned char character;
+	struct tty3270_attribute attributes;
+};
 
-static struct raw3270_fn con3270_fn;
+struct tty3270_line {
+	struct tty3270_cell *cells;
+	int len;
+	int dirty;
+};
 
-static bool auto_update = true;
-module_param(auto_update, bool, 0);
+static const unsigned char sfq_read_partition[] = {
+	0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81
+};
+
+#define ESCAPE_NPAR 8
 
 /*
- * Main 3270 console view data structure.
+ * The main tty view data structure.
+ * FIXME:
+ * 1) describe line orientation & lines list concept against screen
+ * 2) describe conversion of screen to lines
+ * 3) describe line format.
  */
-struct con3270 {
+struct tty3270 {
 	struct raw3270_view view;
-	struct list_head freemem;	/* list of free memory for strings. */
+	struct tty_port port;
 
 	/* Output stuff. */
-	struct list_head lines;		/* list of lines. */
-	struct list_head update;	/* list of lines to update. */
-	int line_nr;			/* line number for next update. */
-	int nr_lines;			/* # lines in list. */
+	unsigned char wcc;		/* Write control character. */
 	int nr_up;			/* # lines up in history. */
 	unsigned long update_flags;	/* Update indication bits. */
-	struct string *cline;		/* current output line. */
-	struct string *status;		/* last line of display. */
-	struct raw3270_request *write;	/* single write request. */
-	struct timer_list timer;
+	struct raw3270_request *write;	/* Single write request. */
+	struct timer_list timer;	/* Output delay timer. */
+	char *converted_line;		/* RAW 3270 data stream */
+	unsigned int line_view_start;	/* Start of visible area */
+	unsigned int line_write_start;	/* current write position */
+	unsigned int oops_line;		/* line counter used when print oops */
+
+	/* Current tty screen. */
+	unsigned int cx, cy;		/* Current output position. */
+	struct tty3270_attribute attributes;
+	struct tty3270_attribute saved_attributes;
+	int allocated_lines;
+	struct tty3270_line *screen;
 
 	/* Input stuff. */
-	struct string *input;		/* input string for read request. */
-	struct raw3270_request *read;	/* single read request. */
-	struct raw3270_request *kreset;	/* single keyboard reset request. */
-	struct tasklet_struct readlet;	/* tasklet to issue read request. */
+	char *prompt;			/* Output string for input area. */
+	char *input;			/* Input string for read request. */
+	struct raw3270_request *read;	/* Single read request. */
+	struct raw3270_request *kreset;	/* Single keyboard reset request. */
+	struct raw3270_request *readpartreq;
+	unsigned char inattr;		/* Visible/invisible input. */
+	int throttle, attn;		/* tty throttle/unthrottle. */
+	struct tasklet_struct readlet;	/* Tasklet to issue read request. */
+	struct tasklet_struct hanglet;	/* Tasklet to hang up the tty. */
+	struct kbd_data *kbd;		/* key_maps stuff. */
+
+	/* Escape sequence parsing. */
+	int esc_state, esc_ques, esc_npar;
+	int esc_par[ESCAPE_NPAR];
+	unsigned int saved_cx, saved_cy;
+
+	/* Command recalling. */
+	char **rcl_lines;		/* Array of recallable lines */
+	int rcl_write_index;		/* Write index of recallable items */
+	int rcl_read_index;		/* Read index of recallable items */
+
+	/* Character array for put_char/flush_chars. */
+	unsigned int char_count;
+	char char_buf[TTY3270_CHAR_BUF_SIZE];
 };
 
-static struct con3270 *condev;
-
-/* con3270->update_flags. See con3270_update for details. */
-#define CON_UPDATE_ERASE	1	/* Use EWRITEA instead of WRITE. */
-#define CON_UPDATE_LIST		2	/* Update lines in tty3270->update. */
-#define CON_UPDATE_STATUS	4	/* Update status line. */
-#define CON_UPDATE_ALL		8	/* Recreate screen. */
+/* tty3270->update_flags. See tty3270_update for details. */
+#define TTY_UPDATE_INPUT	0x1	/* Update input line. */
+#define TTY_UPDATE_STATUS	0x2	/* Update status line. */
+#define TTY_UPDATE_LINES	0x4	/* Update visible screen lines */
+#define TTY_UPDATE_ALL		0x7	/* Recreate screen. */
 
-static void con3270_update(struct timer_list *);
+#define TTY3270_INPUT_AREA_ROWS 2
 
 /*
  * Setup timeout for a device. On timeout trigger an update.
  */
-static void con3270_set_timer(struct con3270 *cp, int expires)
+static void tty3270_set_timer(struct tty3270 *tp, int expires)
 {
-	if (expires == 0)
-		del_timer(&cp->timer);
-	else
-		mod_timer(&cp->timer, jiffies + expires);
+	mod_timer(&tp->timer, jiffies + expires);
 }
 
-/*
- * The status line is the last line of the screen. It shows the string
- * "console view" in the lower left corner and "Running"/"More..."/"Holding"
- * in the lower right corner of the screen.
- */
-static void
-con3270_update_status(struct con3270 *cp)
+static int tty3270_tty_rows(struct tty3270 *tp)
 {
-	char *str;
+	return tp->view.rows - TTY3270_INPUT_AREA_ROWS;
+}
 
-	str = (cp->nr_up != 0) ? "History" : "Running";
-	memcpy(cp->status->string + 24, str, 7);
-	codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
-	cp->update_flags |= CON_UPDATE_STATUS;
+static char *tty3270_add_ba(struct tty3270 *tp, char *cp, char order, int x, int y)
+{
+	*cp++ = order;
+	raw3270_buffer_address(tp->view.dev, cp, x, y);
+	return cp + 2;
 }
 
-static void
-con3270_create_status(struct con3270 *cp)
+static char *tty3270_add_ra(struct tty3270 *tp, char *cp, int x, int y, char c)
+{
+	cp = tty3270_add_ba(tp, cp, TO_RA, x, y);
+	*cp++ = c;
+	return cp;
+}
+
+static char *tty3270_add_sa(struct tty3270 *tp, char *cp, char attr, char value)
+{
+	*cp++ = TO_SA;
+	*cp++ = attr;
+	*cp++ = value;
+	return cp;
+}
+
+static char *tty3270_add_ge(struct tty3270 *tp, char *cp, char c)
+{
+	*cp++ = TO_GE;
+	*cp++ = c;
+	return cp;
+}
+
+static char *tty3270_add_sf(struct tty3270 *tp, char *cp, char type)
+{
+	*cp++ = TO_SF;
+	*cp++ = type;
+	return cp;
+}
+
+static int tty3270_line_increment(struct tty3270 *tp, unsigned int line, unsigned int incr)
+{
+	return (line + incr) & (tp->allocated_lines - 1);
+}
+
+static struct tty3270_line *tty3270_get_write_line(struct tty3270 *tp, unsigned int num)
 {
-	static const unsigned char blueprint[] =
-		{ TO_SBA, 0, 0, TO_SF,TF_LOG,TO_SA,TAT_COLOR, TAC_GREEN,
-		  'c','o','n','s','o','l','e',' ','v','i','e','w',
-		  TO_RA,0,0,0,'R','u','n','n','i','n','g',TO_SF,TF_LOG };
+	return tp->screen + tty3270_line_increment(tp, tp->line_write_start, num);
+}
+
+static struct tty3270_line *tty3270_get_view_line(struct tty3270 *tp, unsigned int num)
+{
+	return tp->screen + tty3270_line_increment(tp, tp->line_view_start, num - tp->nr_up);
+}
 
-	cp->status = alloc_string(&cp->freemem, sizeof(blueprint));
-	/* Copy blueprint to status line */
-	memcpy(cp->status->string, blueprint, sizeof(blueprint));
-	/* Set TO_RA addresses. */
-	raw3270_buffer_address(cp->view.dev, cp->status->string + 1,
-			       cp->view.cols * (cp->view.rows - 1));
-	raw3270_buffer_address(cp->view.dev, cp->status->string + 21,
-			       cp->view.cols * cp->view.rows - 8);
-	/* Convert strings to ebcdic. */
-	codepage_convert(cp->view.ascebc, cp->status->string + 8, 12);
-	codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
+static int tty3270_input_size(int cols)
+{
+	return cols * 2 - 11;
+}
+
+static void tty3270_update_prompt(struct tty3270 *tp, char *input)
+{
+	strcpy(tp->prompt, input);
+	tp->update_flags |= TTY_UPDATE_INPUT;
+	tty3270_set_timer(tp, 1);
 }
 
 /*
- * Set output offsets to 3270 datastream fragment of a console string.
+ * The input line are the two last lines of the screen.
  */
-static void
-con3270_update_string(struct con3270 *cp, struct string *s, int nr)
+static int tty3270_add_prompt(struct tty3270 *tp)
 {
-	if (s->len < 4) {
-		/* This indicates a bug, but printing a warning would
-		 * cause a deadlock. */
-		return;
+	int count = 0;
+	char *cp;
+
+	cp = tp->converted_line;
+	cp = tty3270_add_ba(tp, cp, TO_SBA, 0, -2);
+	*cp++ = tp->view.ascebc['>'];
+
+	if (*tp->prompt) {
+		cp = tty3270_add_sf(tp, cp, TF_INMDT);
+		count = min_t(int, strlen(tp->prompt),
+			      tp->view.cols * 2 - TTY3270_STATUS_AREA_SIZE - 2);
+		memcpy(cp, tp->prompt, count);
+		cp += count;
+	} else {
+		cp = tty3270_add_sf(tp, cp, tp->inattr);
 	}
-	if (s->string[s->len - 4] != TO_RA)
-		return;
-	raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
-			       cp->view.cols * (nr + 1));
+	*cp++ = TO_IC;
+	/* Clear to end of input line. */
+	if (count < tp->view.cols * 2 - 11)
+		cp = tty3270_add_ra(tp, cp, -TTY3270_STATUS_AREA_SIZE, -1, 0);
+	return cp - tp->converted_line;
+}
+
+static char *tty3270_ebcdic_convert(struct tty3270 *tp, char *d, char *s)
+{
+	while (*s)
+		*d++ = tp->view.ascebc[(int)*s++];
+	return d;
 }
 
 /*
- * Rebuild update list to print all lines.
+ * The status line is the last line of the screen. It shows the string
+ * "Running"/"History X" in the lower right corner of the screen.
  */
-static void
-con3270_rebuild_update(struct con3270 *cp)
+static int tty3270_add_status(struct tty3270 *tp)
 {
-	struct string *s, *n;
-	int nr;
+	char *cp = tp->converted_line;
+	int len;
+
+	cp = tty3270_add_ba(tp, cp, TO_SBA, -TTY3270_STATUS_AREA_SIZE, -1);
+	cp = tty3270_add_sf(tp, cp, TF_LOG);
+	cp = tty3270_add_sa(tp, cp, TAT_FGCOLOR, TAC_GREEN);
+	cp = tty3270_ebcdic_convert(tp, cp, " 7");
+	cp = tty3270_add_sa(tp, cp, TAT_EXTHI, TAX_REVER);
+	cp = tty3270_ebcdic_convert(tp, cp, "PrevPg");
+	cp = tty3270_add_sa(tp, cp, TAT_EXTHI, TAX_RESET);
+	cp = tty3270_ebcdic_convert(tp, cp, " 8");
+	cp = tty3270_add_sa(tp, cp, TAT_EXTHI, TAX_REVER);
+	cp = tty3270_ebcdic_convert(tp, cp, "NextPg");
+	cp = tty3270_add_sa(tp, cp, TAT_EXTHI, TAX_RESET);
+	cp = tty3270_ebcdic_convert(tp, cp, " 12");
+	cp = tty3270_add_sa(tp, cp, TAT_EXTHI, TAX_REVER);
+	cp = tty3270_ebcdic_convert(tp, cp, "Recall");
+	cp = tty3270_add_sa(tp, cp, TAT_EXTHI, TAX_RESET);
+	cp = tty3270_ebcdic_convert(tp, cp, "  ");
+	if (tp->nr_up) {
+		len = sprintf(cp, "History %d", -tp->nr_up);
+		codepage_convert(tp->view.ascebc, cp, len);
+		cp += len;
+	} else {
+		cp = tty3270_ebcdic_convert(tp, cp, oops_in_progress ? "Crashed" : "Running");
+	}
+	cp = tty3270_add_sf(tp, cp, TF_LOG);
+	cp = tty3270_add_sa(tp, cp, TAT_FGCOLOR, TAC_RESET);
+	return cp - (char *)tp->converted_line;
+}
 
-	/* 
-	 * Throw away update list and create a new one,
-	 * containing all lines that will fit on the screen.
-	 */
-	list_for_each_entry_safe(s, n, &cp->update, update)
-		list_del_init(&s->update);
-	nr = cp->view.rows - 2 + cp->nr_up;
-	list_for_each_entry_reverse(s, &cp->lines, list) {
-		if (nr < cp->view.rows - 1)
-			list_add(&s->update, &cp->update);
-		if (--nr < 0)
-			break;
+static void tty3270_blank_screen(struct tty3270 *tp)
+{
+	struct tty3270_line *line;
+	int i;
+
+	for (i = 0; i < tty3270_tty_rows(tp); i++) {
+		line = tty3270_get_write_line(tp, i);
+		line->len = 0;
+		line->dirty = 1;
 	}
-	cp->line_nr = 0;
-	cp->update_flags |= CON_UPDATE_LIST;
+	tp->nr_up = 0;
 }
 
 /*
- * Alloc string for size bytes. Free strings from history if necessary.
+ * Write request completion callback.
  */
-static struct string *
-con3270_alloc_string(struct con3270 *cp, size_t size)
+static void tty3270_write_callback(struct raw3270_request *rq, void *data)
 {
-	struct string *s, *n;
+	struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
 
-	s = alloc_string(&cp->freemem, size);
-	if (s)
-		return s;
-	list_for_each_entry_safe(s, n, &cp->lines, list) {
-		list_del(&s->list);
-		if (!list_empty(&s->update))
-			list_del(&s->update);
-		cp->nr_lines--;
-		if (free_string(&cp->freemem, s) >= size)
-			break;
+	if (rq->rc != 0) {
+		/* Write wasn't successful. Refresh all. */
+		tp->update_flags = TTY_UPDATE_ALL;
+		tty3270_set_timer(tp, 1);
 	}
-	s = alloc_string(&cp->freemem, size);
-	BUG_ON(!s);
-	if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) {
-		cp->nr_up = cp->nr_lines - cp->view.rows + 1;
-		con3270_rebuild_update(cp);
-		con3270_update_status(cp);
+	raw3270_request_reset(rq);
+	xchg(&tp->write, rq);
+}
+
+static int tty3270_required_length(struct tty3270 *tp, struct tty3270_line *line)
+{
+	unsigned char f_color, b_color, highlight;
+	struct tty3270_cell *cell;
+	int i, flen = 3;		/* Prefix (TO_SBA). */
+
+	flen += line->len;
+	highlight = 0;
+	f_color = TAC_RESET;
+	b_color = TAC_RESET;
+
+	for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
+		if (cell->attributes.highlight != highlight) {
+			flen += 3;	/* TO_SA to switch highlight. */
+			highlight = cell->attributes.highlight;
+		}
+		if (cell->attributes.f_color != f_color) {
+			flen += 3;	/* TO_SA to switch color. */
+			f_color = cell->attributes.f_color;
+		}
+		if (cell->attributes.b_color != b_color) {
+			flen += 3;	/* TO_SA to switch color. */
+			b_color = cell->attributes.b_color;
+		}
+		if (cell->attributes.alternate_charset)
+			flen += 1;	/* TO_GE to switch to graphics extensions */
 	}
-	return s;
+	if (highlight)
+		flen += 3;	/* TO_SA to reset hightlight. */
+	if (f_color != TAC_RESET)
+		flen += 3;	/* TO_SA to reset color. */
+	if (b_color != TAC_RESET)
+		flen += 3;	/* TO_SA to reset color. */
+	if (line->len < tp->view.cols)
+		flen += 4;	/* Postfix (TO_RA). */
+
+	return flen;
+}
+
+static char *tty3270_add_reset_attributes(struct tty3270 *tp, struct tty3270_line *line,
+					  char *cp, struct tty3270_attribute *attr, int lineno)
+{
+	if (attr->highlight)
+		cp = tty3270_add_sa(tp, cp, TAT_EXTHI, TAX_RESET);
+	if (attr->f_color != TAC_RESET)
+		cp = tty3270_add_sa(tp, cp, TAT_FGCOLOR, TAX_RESET);
+	if (attr->b_color != TAC_RESET)
+		cp = tty3270_add_sa(tp, cp, TAT_BGCOLOR, TAX_RESET);
+	if (line->len < tp->view.cols)
+		cp = tty3270_add_ra(tp, cp, 0, lineno + 1, 0);
+	return cp;
+}
+
+static char tty3270_graphics_translate(struct tty3270 *tp, char ch)
+{
+	switch (ch) {
+	case 'q': /* - */
+		return 0xa2;
+	case 'x': /* '|' */
+		return 0x85;
+	case 'l': /* |- */
+		return 0xc5;
+	case 't': /* |_ */
+		return 0xc6;
+	case 'u': /* _| */
+		return 0xd6;
+	case 'k': /* -| */
+		return 0xd5;
+	case 'j':
+		return 0xd4;
+	case 'm':
+		return 0xc4;
+	case 'n': /* + */
+		return 0xd3;
+	case 'v':
+		return 0xc7;
+	case 'w':
+		return 0xd7;
+	default:
+		return ch;
+	}
+}
+
+static char *tty3270_add_attributes(struct tty3270 *tp, struct tty3270_line *line,
+				    struct tty3270_attribute *attr, char *cp, int lineno)
+{
+	const unsigned char colors[16] = {
+		[0] = TAC_DEFAULT,
+		[1] = TAC_RED,
+		[2] = TAC_GREEN,
+		[3] = TAC_YELLOW,
+		[4] = TAC_BLUE,
+		[5] = TAC_PINK,
+		[6] = TAC_TURQ,
+		[7] = TAC_WHITE,
+		[9] = TAC_DEFAULT
+	};
+
+	const unsigned char highlights[8] = {
+		[TTY3270_HIGHLIGHT_BLINK] = TAX_BLINK,
+		[TTY3270_HIGHLIGHT_REVERSE] = TAX_REVER,
+		[TTY3270_HIGHLIGHT_UNDERSCORE] = TAX_UNDER,
+	};
+
+	struct tty3270_cell *cell;
+	int c, i;
+
+	cp = tty3270_add_ba(tp, cp, TO_SBA, 0, lineno);
+
+	for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
+		if (cell->attributes.highlight != attr->highlight) {
+			attr->highlight = cell->attributes.highlight;
+			cp = tty3270_add_sa(tp, cp, TAT_EXTHI, highlights[attr->highlight]);
+		}
+		if (cell->attributes.f_color != attr->f_color) {
+			attr->f_color = cell->attributes.f_color;
+			cp = tty3270_add_sa(tp, cp, TAT_FGCOLOR, colors[attr->f_color]);
+		}
+		if (cell->attributes.b_color != attr->b_color) {
+			attr->b_color = cell->attributes.b_color;
+			cp = tty3270_add_sa(tp, cp, TAT_BGCOLOR, colors[attr->b_color]);
+		}
+		c = cell->character;
+		if (cell->attributes.alternate_charset)
+			cp = tty3270_add_ge(tp, cp, tty3270_graphics_translate(tp, c));
+		else
+			*cp++ = tp->view.ascebc[c];
+	}
+	return cp;
+}
+
+static void tty3270_reset_attributes(struct tty3270_attribute *attr)
+{
+	attr->highlight = TAX_RESET;
+	attr->f_color = TAC_RESET;
+	attr->b_color = TAC_RESET;
 }
 
 /*
- * Write completion callback.
+ * Convert a tty3270_line to a 3270 data fragment usable for output.
  */
-static void
-con3270_write_callback(struct raw3270_request *rq, void *data)
+static unsigned int tty3270_convert_line(struct tty3270 *tp, struct tty3270_line *line, int lineno)
 {
-	raw3270_request_reset(rq);
-	xchg(&((struct con3270 *) rq->view)->write, rq);
+	struct tty3270_attribute attr;
+	int flen;
+	char *cp;
+
+	/* Determine how long the fragment will be. */
+	flen = tty3270_required_length(tp, line);
+	if (flen > PAGE_SIZE)
+		return 0;
+	/* Write 3270 data fragment. */
+	tty3270_reset_attributes(&attr);
+	cp = tty3270_add_attributes(tp, line, &attr, tp->converted_line, lineno);
+	cp = tty3270_add_reset_attributes(tp, line, cp, &attr, lineno);
+	return cp - (char *)tp->converted_line;
+}
+
+static void tty3270_update_lines_visible(struct tty3270 *tp, struct raw3270_request *rq)
+{
+	struct tty3270_line *line;
+	int len, i;
+
+	for (i = 0; i < tty3270_tty_rows(tp); i++) {
+		line = tty3270_get_view_line(tp, i);
+		if (!line->dirty)
+			continue;
+		len = tty3270_convert_line(tp, line, i);
+		if (raw3270_request_add_data(rq, tp->converted_line, len))
+			break;
+		line->dirty = 0;
+	}
+	if (i == tty3270_tty_rows(tp)) {
+		for (i = 0; i < tp->allocated_lines; i++)
+			tp->screen[i].dirty = 0;
+		tp->update_flags &= ~TTY_UPDATE_LINES;
+	}
+}
+
+static void tty3270_update_lines_all(struct tty3270 *tp, struct raw3270_request *rq)
+{
+	struct tty3270_line *line;
+	char buf[4];
+	int len, i;
+
+	for (i = 0; i < tp->allocated_lines; i++) {
+		line = tty3270_get_write_line(tp, i + tp->cy + 1);
+		if (!line->dirty)
+			continue;
+		len = tty3270_convert_line(tp, line, tp->oops_line);
+		if (raw3270_request_add_data(rq, tp->converted_line, len))
+			break;
+		line->dirty = 0;
+		if (++tp->oops_line >= tty3270_tty_rows(tp))
+			tp->oops_line = 0;
+	}
+
+	if (i == tp->allocated_lines) {
+		if (tp->oops_line < tty3270_tty_rows(tp)) {
+			tty3270_add_ra(tp, buf, 0, tty3270_tty_rows(tp), 0);
+			if (raw3270_request_add_data(rq, buf, sizeof(buf)))
+				return;
+		}
+		tp->update_flags &= ~TTY_UPDATE_LINES;
+	}
 }
 
 /*
- * Update console display.
+ * Update 3270 display.
  */
-static void
-con3270_update(struct timer_list *t)
+static void tty3270_update(struct timer_list *t)
 {
-	struct con3270 *cp = from_timer(cp, t, timer);
+	struct tty3270 *tp = from_timer(tp, t, timer);
 	struct raw3270_request *wrq;
-	char wcc, prolog[6];
-	unsigned long flags;
-	unsigned long updated;
-	struct string *s, *n;
-	int rc;
+	u8 cmd = TC_WRITE;
+	int rc, len;
 
-	if (!auto_update && !raw3270_view_active(&cp->view))
-		return;
-	if (cp->view.dev)
-		raw3270_activate_view(&cp->view);
-
-	wrq = xchg(&cp->write, 0);
+	wrq = xchg(&tp->write, 0);
 	if (!wrq) {
-		con3270_set_timer(cp, 1);
+		tty3270_set_timer(tp, 1);
 		return;
 	}
 
-	spin_lock_irqsave(&cp->view.lock, flags);
-	updated = 0;
-	if (cp->update_flags & CON_UPDATE_ALL) {
-		con3270_rebuild_update(cp);
-		con3270_update_status(cp);
-		cp->update_flags = CON_UPDATE_ERASE | CON_UPDATE_LIST |
-			CON_UPDATE_STATUS;
-	}
-	if (cp->update_flags & CON_UPDATE_ERASE) {
-		/* Use erase write alternate to initialize display. */
-		raw3270_request_set_cmd(wrq, TC_EWRITEA);
-		updated |= CON_UPDATE_ERASE;
-	} else
-		raw3270_request_set_cmd(wrq, TC_WRITE);
+	spin_lock_irq(&tp->view.lock);
+	if (tp->update_flags == TTY_UPDATE_ALL)
+		cmd = TC_EWRITEA;
 
-	wcc = TW_NONE;
-	raw3270_request_add_data(wrq, &wcc, 1);
+	raw3270_request_set_cmd(wrq, cmd);
+	raw3270_request_add_data(wrq, &tp->wcc, 1);
+	tp->wcc = TW_NONE;
 
 	/*
 	 * Update status line.
 	 */
-	if (cp->update_flags & CON_UPDATE_STATUS)
-		if (raw3270_request_add_data(wrq, cp->status->string,
-					     cp->status->len) == 0)
-			updated |= CON_UPDATE_STATUS;
-
-	if (cp->update_flags & CON_UPDATE_LIST) {
-		prolog[0] = TO_SBA;
-		prolog[3] = TO_SA;
-		prolog[4] = TAT_COLOR;
-		prolog[5] = TAC_TURQ;
-		raw3270_buffer_address(cp->view.dev, prolog + 1,
-				       cp->view.cols * cp->line_nr);
-		raw3270_request_add_data(wrq, prolog, 6);
-		/* Write strings in the update list to the screen. */
-		list_for_each_entry_safe(s, n, &cp->update, update) {
-			if (s != cp->cline)
-				con3270_update_string(cp, s, cp->line_nr);
-			if (raw3270_request_add_data(wrq, s->string,
-						     s->len) != 0)
-				break;
-			list_del_init(&s->update);
-			if (s != cp->cline)
-				cp->line_nr++;
-		}
-		if (list_empty(&cp->update))
-			updated |= CON_UPDATE_LIST;
+	if (tp->update_flags & TTY_UPDATE_STATUS) {
+		len = tty3270_add_status(tp);
+		if (raw3270_request_add_data(wrq, tp->converted_line, len) == 0)
+			tp->update_flags &= ~TTY_UPDATE_STATUS;
+	}
+
+	/*
+	 * Write input line.
+	 */
+	if (tp->update_flags & TTY_UPDATE_INPUT) {
+		len = tty3270_add_prompt(tp);
+		if (raw3270_request_add_data(wrq, tp->converted_line, len) == 0)
+			tp->update_flags &= ~TTY_UPDATE_INPUT;
+	}
+
+	if (tp->update_flags & TTY_UPDATE_LINES) {
+		if (oops_in_progress)
+			tty3270_update_lines_all(tp, wrq);
+		else
+			tty3270_update_lines_visible(tp, wrq);
 	}
-	wrq->callback = con3270_write_callback;
-	rc = raw3270_start(&cp->view, wrq);
+
+	wrq->callback = tty3270_write_callback;
+	rc = raw3270_start(&tp->view, wrq);
 	if (rc == 0) {
-		cp->update_flags &= ~updated;
-		if (cp->update_flags)
-			con3270_set_timer(cp, 1);
+		if (tp->update_flags)
+			tty3270_set_timer(tp, 1);
 	} else {
 		raw3270_request_reset(wrq);
-		xchg(&cp->write, wrq);
+		xchg(&tp->write, wrq);
 	}
-	spin_unlock_irqrestore(&cp->view.lock, flags);
+	spin_unlock_irq(&tp->view.lock);
 }
 
 /*
- * Read tasklet.
+ * Command recalling.
  */
-static void
-con3270_read_tasklet(unsigned long data)
+static void tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
+{
+	char *p;
+
+	if (len <= 0)
+		return;
+	p = tp->rcl_lines[tp->rcl_write_index++];
+	tp->rcl_write_index &= TTY3270_RECALL_SIZE - 1;
+	memcpy(p, input, len);
+	p[len] = '\0';
+	tp->rcl_read_index = tp->rcl_write_index;
+}
+
+static void tty3270_rcl_backward(struct kbd_data *kbd)
+{
+	struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
+	int i = 0;
+
+	spin_lock_irq(&tp->view.lock);
+	if (tp->inattr == TF_INPUT) {
+		do {
+			tp->rcl_read_index--;
+			tp->rcl_read_index &= TTY3270_RECALL_SIZE - 1;
+		} while (!*tp->rcl_lines[tp->rcl_read_index] &&
+			 i++ < TTY3270_RECALL_SIZE - 1);
+		tty3270_update_prompt(tp, tp->rcl_lines[tp->rcl_read_index]);
+	}
+	spin_unlock_irq(&tp->view.lock);
+}
+
+/*
+ * Deactivate tty view.
+ */
+static void tty3270_exit_tty(struct kbd_data *kbd)
+{
+	struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
+
+	raw3270_deactivate_view(&tp->view);
+}
+
+static void tty3270_redraw(struct tty3270 *tp)
+{
+	int i;
+
+	for (i = 0; i < tty3270_tty_rows(tp); i++)
+		tty3270_get_view_line(tp, i)->dirty = 1;
+	tp->update_flags = TTY_UPDATE_ALL;
+	tty3270_set_timer(tp, 1);
+}
+
+/*
+ * Scroll forward in history.
+ */
+static void tty3270_scroll_forward(struct kbd_data *kbd)
+{
+	struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
+
+	spin_lock_irq(&tp->view.lock);
+
+	if (tp->nr_up >= tty3270_tty_rows(tp))
+		tp->nr_up -= tty3270_tty_rows(tp) / 2;
+	else
+		tp->nr_up = 0;
+	tty3270_redraw(tp);
+	spin_unlock_irq(&tp->view.lock);
+}
+
+/*
+ * Scroll backward in history.
+ */
+static void tty3270_scroll_backward(struct kbd_data *kbd)
+{
+	struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
+
+	spin_lock_irq(&tp->view.lock);
+	tp->nr_up += tty3270_tty_rows(tp) / 2;
+	if (tp->nr_up > tp->allocated_lines - tty3270_tty_rows(tp))
+		tp->nr_up = tp->allocated_lines - tty3270_tty_rows(tp);
+	tty3270_redraw(tp);
+	spin_unlock_irq(&tp->view.lock);
+}
+
+/*
+ * Pass input line to tty.
+ */
+static void tty3270_read_tasklet(unsigned long data)
 {
+	struct raw3270_request *rrq = (struct raw3270_request *)data;
 	static char kreset_data = TW_KR;
-	struct raw3270_request *rrq;
-	struct con3270 *cp;
-	unsigned long flags;
-	int nr_up, deactivate;
-
-	rrq = (struct raw3270_request *)data;
-	cp = (struct con3270 *) rrq->view;
-	spin_lock_irqsave(&cp->view.lock, flags);
-	nr_up = cp->nr_up;
-	deactivate = 0;
-	/* Check aid byte. */
-	switch (cp->input->string[0]) {
-	case 0x7d:	/* enter: jump to bottom. */
-		nr_up = 0;
-		break;
-	case 0xf3:	/* PF3: deactivate the console view. */
-		deactivate = 1;
+	struct tty3270 *tp = container_of(rrq->view, struct tty3270, view);
+	char *input;
+	int len;
+
+	spin_lock_irq(&tp->view.lock);
+	/*
+	 * Two AID keys are special: For 0x7d (enter) the input line
+	 * has to be emitted to the tty and for 0x6d the screen
+	 * needs to be redrawn.
+	 */
+	input = NULL;
+	len = 0;
+	switch (tp->input[0]) {
+	case AID_ENTER:
+		/* Enter: write input to tty. */
+		input = tp->input + 6;
+		len = tty3270_input_size(tp->view.cols) - 6 - rrq->rescnt;
+		if (tp->inattr != TF_INPUTN)
+			tty3270_rcl_add(tp, input, len);
+		if (tp->nr_up > 0)
+			tp->nr_up = 0;
+		/* Clear input area. */
+		tty3270_update_prompt(tp, "");
+		tty3270_set_timer(tp, 1);
 		break;
-	case 0x6d:	/* clear: start from scratch. */
-		cp->update_flags = CON_UPDATE_ALL;
-		con3270_set_timer(cp, 1);
+	case AID_CLEAR:
+		/* Display has been cleared. Redraw. */
+		tp->update_flags = TTY_UPDATE_ALL;
+		tty3270_set_timer(tp, 1);
+		if (!list_empty(&tp->readpartreq->list))
+			break;
+		raw3270_start_request(&tp->view, tp->readpartreq, TC_WRITESF,
+				      (char *)sfq_read_partition, sizeof(sfq_read_partition));
 		break;
-	case 0xf7:	/* PF7: do a page up in the console log. */
-		nr_up += cp->view.rows - 2;
-		if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
-			nr_up = cp->nr_lines - cp->view.rows + 1;
-			if (nr_up < 0)
-				nr_up = 0;
-		}
+	case AID_READ_PARTITION:
+		raw3270_read_modified_cb(tp->readpartreq, tp->input);
 		break;
-	case 0xf8:	/* PF8: do a page down in the console log. */
-		nr_up -= cp->view.rows - 2;
-		if (nr_up < 0)
-			nr_up = 0;
+	default:
 		break;
 	}
-	if (nr_up != cp->nr_up) {
-		cp->nr_up = nr_up;
-		con3270_rebuild_update(cp);
-		con3270_update_status(cp);
-		con3270_set_timer(cp, 1);
-	}
-	spin_unlock_irqrestore(&cp->view.lock, flags);
+	spin_unlock_irq(&tp->view.lock);
 
 	/* Start keyboard reset command. */
-	raw3270_request_reset(cp->kreset);
-	raw3270_request_set_cmd(cp->kreset, TC_WRITE);
-	raw3270_request_add_data(cp->kreset, &kreset_data, 1);
-	raw3270_start(&cp->view, cp->kreset);
+	raw3270_start_request(&tp->view, tp->kreset, TC_WRITE, &kreset_data, 1);
 
-	if (deactivate)
-		raw3270_deactivate_view(&cp->view);
+	while (len-- > 0)
+		kbd_keycode(tp->kbd, *input++);
+	/* Emit keycode for AID byte. */
+	kbd_keycode(tp->kbd, 256 + tp->input[0]);
 
 	raw3270_request_reset(rrq);
-	xchg(&cp->read, rrq);
-	raw3270_put_view(&cp->view);
+	xchg(&tp->read, rrq);
+	raw3270_put_view(&tp->view);
 }
 
 /*
  * Read request completion callback.
  */
-static void
-con3270_read_callback(struct raw3270_request *rq, void *data)
+static void tty3270_read_callback(struct raw3270_request *rq, void *data)
 {
+	struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
+
 	raw3270_get_view(rq->view);
 	/* Schedule tasklet to pass input to tty. */
-	tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
+	tasklet_schedule(&tp->readlet);
 }
 
 /*
- * Issue a read request. Called only from interrupt function.
+ * Issue a read request. Call with device lock.
  */
-static void
-con3270_issue_read(struct con3270 *cp)
+static void tty3270_issue_read(struct tty3270 *tp, int lock)
 {
 	struct raw3270_request *rrq;
 	int rc;
 
-	rrq = xchg(&cp->read, 0);
+	rrq = xchg(&tp->read, 0);
 	if (!rrq)
 		/* Read already scheduled. */
 		return;
-	rrq->callback = con3270_read_callback;
-	rrq->callback_data = cp;
+	rrq->callback = tty3270_read_callback;
+	rrq->callback_data = tp;
 	raw3270_request_set_cmd(rrq, TC_READMOD);
-	raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
+	raw3270_request_set_data(rrq, tp->input, tty3270_input_size(tp->view.cols));
 	/* Issue the read modified request. */
-	rc = raw3270_start_irq(&cp->view, rrq);
-	if (rc)
+	if (lock)
+		rc = raw3270_start(&tp->view, rrq);
+	else
+		rc = raw3270_start_irq(&tp->view, rrq);
+	if (rc) {
 		raw3270_request_reset(rrq);
+		xchg(&tp->read, rrq);
+	}
 }
 
 /*
- * Switch to the console view.
+ * Hang up the tty
  */
-static int
-con3270_activate(struct raw3270_view *view)
+static void tty3270_hangup_tasklet(unsigned long data)
 {
-	struct con3270 *cp;
+	struct tty3270 *tp = (struct tty3270 *)data;
+
+	tty_port_tty_hangup(&tp->port, true);
+	raw3270_put_view(&tp->view);
+}
 
-	cp = (struct con3270 *) view;
-	cp->update_flags = CON_UPDATE_ALL;
-	con3270_set_timer(cp, 1);
+/*
+ * Switch to the tty view.
+ */
+static int tty3270_activate(struct raw3270_view *view)
+{
+	struct tty3270 *tp = container_of(view, struct tty3270, view);
+
+	tp->update_flags = TTY_UPDATE_ALL;
+	tty3270_set_timer(tp, 1);
 	return 0;
 }
 
-static void
-con3270_deactivate(struct raw3270_view *view)
+static void tty3270_deactivate(struct raw3270_view *view)
 {
-	struct con3270 *cp;
+	struct tty3270 *tp = container_of(view, struct tty3270, view);
 
-	cp = (struct con3270 *) view;
-	del_timer(&cp->timer);
+	del_timer(&tp->timer);
 }
 
-static void
-con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
+static void tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
 {
 	/* Handle ATTN. Schedule tasklet to read aid. */
-	if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
-		con3270_issue_read(cp);
+	if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
+		if (!tp->throttle)
+			tty3270_issue_read(tp, 0);
+		else
+			tp->attn = 1;
+	}
 
 	if (rq) {
-		if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
+		if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 			rq->rc = -EIO;
-		else
+			raw3270_get_view(&tp->view);
+			tasklet_schedule(&tp->hanglet);
+		} else {
 			/* Normal end. Copy residual count. */
 			rq->rescnt = irb->scsw.cmd.count;
+		}
 	} else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
 		/* Interrupt without an outstanding request -> update all */
-		cp->update_flags = CON_UPDATE_ALL;
-		con3270_set_timer(cp, 1);
+		tp->update_flags = TTY_UPDATE_ALL;
+		tty3270_set_timer(tp, 1);
+	}
+}
+
+/*
+ * Allocate tty3270 structure.
+ */
+static struct tty3270 *tty3270_alloc_view(void)
+{
+	struct tty3270 *tp;
+
+	tp = kzalloc(sizeof(*tp), GFP_KERNEL);
+	if (!tp)
+		goto out_err;
+
+	tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
+	if (IS_ERR(tp->write))
+		goto out_tp;
+	tp->read = raw3270_request_alloc(0);
+	if (IS_ERR(tp->read))
+		goto out_write;
+	tp->kreset = raw3270_request_alloc(1);
+	if (IS_ERR(tp->kreset))
+		goto out_read;
+	tp->readpartreq = raw3270_request_alloc(sizeof(sfq_read_partition));
+	if (IS_ERR(tp->readpartreq))
+		goto out_reset;
+	tp->kbd = kbd_alloc();
+	if (!tp->kbd)
+		goto out_readpartreq;
+
+	tty_port_init(&tp->port);
+	timer_setup(&tp->timer, tty3270_update, 0);
+	tasklet_init(&tp->readlet, tty3270_read_tasklet,
+		     (unsigned long)tp->read);
+	tasklet_init(&tp->hanglet, tty3270_hangup_tasklet,
+		     (unsigned long)tp);
+	return tp;
+
+out_readpartreq:
+	raw3270_request_free(tp->readpartreq);
+out_reset:
+	raw3270_request_free(tp->kreset);
+out_read:
+	raw3270_request_free(tp->read);
+out_write:
+	raw3270_request_free(tp->write);
+out_tp:
+	kfree(tp);
+out_err:
+	return ERR_PTR(-ENOMEM);
+}
+
+/*
+ * Free tty3270 structure.
+ */
+static void tty3270_free_view(struct tty3270 *tp)
+{
+	kbd_free(tp->kbd);
+	raw3270_request_free(tp->kreset);
+	raw3270_request_free(tp->read);
+	raw3270_request_free(tp->write);
+	free_page((unsigned long)tp->converted_line);
+	tty_port_destroy(&tp->port);
+	kfree(tp);
+}
+
+/*
+ * Allocate tty3270 screen.
+ */
+static struct tty3270_line *tty3270_alloc_screen(struct tty3270 *tp, unsigned int rows,
+						 unsigned int cols, int *allocated_out)
+{
+	struct tty3270_line *screen;
+	int allocated, lines;
+
+	allocated = __roundup_pow_of_two(rows) * TTY3270_SCREEN_PAGES;
+	screen = kcalloc(allocated, sizeof(struct tty3270_line), GFP_KERNEL);
+	if (!screen)
+		goto out_err;
+	for (lines = 0; lines < allocated; lines++) {
+		screen[lines].cells = kcalloc(cols, sizeof(struct tty3270_cell), GFP_KERNEL);
+		if (!screen[lines].cells)
+			goto out_screen;
+	}
+	*allocated_out = allocated;
+	return screen;
+out_screen:
+	while (lines--)
+		kfree(screen[lines].cells);
+	kfree(screen);
+out_err:
+	return ERR_PTR(-ENOMEM);
+}
+
+static char **tty3270_alloc_recall(int cols)
+{
+	char **lines;
+	int i;
+
+	lines = kmalloc_array(TTY3270_RECALL_SIZE, sizeof(char *), GFP_KERNEL);
+	if (!lines)
+		return NULL;
+	for (i = 0; i < TTY3270_RECALL_SIZE; i++) {
+		lines[i] = kcalloc(1, tty3270_input_size(cols) + 1, GFP_KERNEL);
+		if (!lines[i])
+			break;
 	}
+
+	if (i == TTY3270_RECALL_SIZE)
+		return lines;
+
+	while (i--)
+		kfree(lines[i]);
+	kfree(lines);
+	return NULL;
 }
 
-/* Console view to a 3270 device. */
-static struct raw3270_fn con3270_fn = {
-	.activate = con3270_activate,
-	.deactivate = con3270_deactivate,
-	.intv = (void *) con3270_irq
+static void tty3270_free_recall(char **lines)
+{
+	int i;
+
+	for (i = 0; i < TTY3270_RECALL_SIZE; i++)
+		kfree(lines[i]);
+	kfree(lines);
+}
+
+/*
+ * Free tty3270 screen.
+ */
+static void tty3270_free_screen(struct tty3270_line *screen, int old_lines)
+{
+	int lines;
+
+	for (lines = 0; lines < old_lines; lines++)
+		kfree(screen[lines].cells);
+	kfree(screen);
+}
+
+/*
+ * Resize tty3270 screen
+ */
+static void tty3270_resize(struct raw3270_view *view,
+			   int new_model, int new_rows, int new_cols,
+			   int old_model, int old_rows, int old_cols)
+{
+	struct tty3270 *tp = container_of(view, struct tty3270, view);
+	struct tty3270_line *screen, *oscreen;
+	char **old_rcl_lines, **new_rcl_lines;
+	char *old_prompt, *new_prompt;
+	char *old_input, *new_input;
+	struct tty_struct *tty;
+	struct winsize ws;
+	int new_allocated, old_allocated = tp->allocated_lines;
+
+	if (old_model == new_model &&
+	    old_cols == new_cols &&
+	    old_rows == new_rows) {
+		spin_lock_irq(&tp->view.lock);
+		tty3270_redraw(tp);
+		spin_unlock_irq(&tp->view.lock);
+		return;
+	}
+
+	new_input = kzalloc(tty3270_input_size(new_cols), GFP_KERNEL | GFP_DMA);
+	if (!new_input)
+		return;
+	new_prompt = kzalloc(tty3270_input_size(new_cols), GFP_KERNEL);
+	if (!new_prompt)
+		goto out_input;
+	screen = tty3270_alloc_screen(tp, new_rows, new_cols, &new_allocated);
+	if (IS_ERR(screen))
+		goto out_prompt;
+	new_rcl_lines = tty3270_alloc_recall(new_cols);
+	if (!new_rcl_lines)
+		goto out_screen;
+
+	/* Switch to new output size */
+	spin_lock_irq(&tp->view.lock);
+	tty3270_blank_screen(tp);
+	oscreen = tp->screen;
+	tp->screen = screen;
+	tp->allocated_lines = new_allocated;
+	tp->view.rows = new_rows;
+	tp->view.cols = new_cols;
+	tp->view.model = new_model;
+	tp->update_flags = TTY_UPDATE_ALL;
+	old_input = tp->input;
+	old_prompt = tp->prompt;
+	old_rcl_lines = tp->rcl_lines;
+	tp->input = new_input;
+	tp->prompt = new_prompt;
+	tp->rcl_lines = new_rcl_lines;
+	tp->rcl_read_index = 0;
+	tp->rcl_write_index = 0;
+	spin_unlock_irq(&tp->view.lock);
+	tty3270_free_screen(oscreen, old_allocated);
+	kfree(old_input);
+	kfree(old_prompt);
+	tty3270_free_recall(old_rcl_lines);
+	tty3270_set_timer(tp, 1);
+	/* Informat tty layer about new size */
+	tty = tty_port_tty_get(&tp->port);
+	if (!tty)
+		return;
+	ws.ws_row = tty3270_tty_rows(tp);
+	ws.ws_col = tp->view.cols;
+	tty_do_resize(tty, &ws);
+	tty_kref_put(tty);
+	return;
+out_screen:
+	tty3270_free_screen(screen, new_rows);
+out_prompt:
+	kfree(new_prompt);
+out_input:
+	kfree(new_input);
+}
+
+/*
+ * Unlink tty3270 data structure from tty.
+ */
+static void tty3270_release(struct raw3270_view *view)
+{
+	struct tty3270 *tp = container_of(view, struct tty3270, view);
+	struct tty_struct *tty = tty_port_tty_get(&tp->port);
+
+	if (tty) {
+		tty->driver_data = NULL;
+		tty_port_tty_set(&tp->port, NULL);
+		tty_hangup(tty);
+		raw3270_put_view(&tp->view);
+		tty_kref_put(tty);
+	}
+}
+
+/*
+ * Free tty3270 data structure
+ */
+static void tty3270_free(struct raw3270_view *view)
+{
+	struct tty3270 *tp = container_of(view, struct tty3270, view);
+
+	del_timer_sync(&tp->timer);
+	tty3270_free_screen(tp->screen, tp->allocated_lines);
+	free_page((unsigned long)tp->converted_line);
+	kfree(tp->input);
+	kfree(tp->prompt);
+	tty3270_free_view(tp);
+}
+
+/*
+ * Delayed freeing of tty3270 views.
+ */
+static void tty3270_del_views(void)
+{
+	int i;
+
+	for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) {
+		struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i);
+
+		if (!IS_ERR(view))
+			raw3270_del_view(view);
+	}
+}
+
+static struct raw3270_fn tty3270_fn = {
+	.activate = tty3270_activate,
+	.deactivate = tty3270_deactivate,
+	.intv = (void *)tty3270_irq,
+	.release = tty3270_release,
+	.free = tty3270_free,
+	.resize = tty3270_resize
 };
 
-static inline void
-con3270_cline_add(struct con3270 *cp)
+static int
+tty3270_create_view(int index, struct tty3270 **newtp)
+{
+	struct tty3270 *tp;
+	int rc;
+
+	if (tty3270_max_index < index + 1)
+		tty3270_max_index = index + 1;
+
+	/* Allocate tty3270 structure on first open. */
+	tp = tty3270_alloc_view();
+	if (IS_ERR(tp))
+		return PTR_ERR(tp);
+
+	rc = raw3270_add_view(&tp->view, &tty3270_fn,
+			      index + RAW3270_FIRSTMINOR,
+			      RAW3270_VIEW_LOCK_IRQ);
+	if (rc)
+		goto out_free_view;
+
+	tp->screen = tty3270_alloc_screen(tp, tp->view.rows, tp->view.cols,
+					  &tp->allocated_lines);
+	if (IS_ERR(tp->screen)) {
+		rc = PTR_ERR(tp->screen);
+		goto out_put_view;
+	}
+
+	tp->converted_line = (void *)__get_free_page(GFP_KERNEL);
+	if (!tp->converted_line) {
+		rc = -ENOMEM;
+		goto out_free_screen;
+	}
+
+	tp->input = kzalloc(tty3270_input_size(tp->view.cols), GFP_KERNEL | GFP_DMA);
+	if (!tp->input) {
+		rc = -ENOMEM;
+		goto out_free_converted_line;
+	}
+
+	tp->prompt = kzalloc(tty3270_input_size(tp->view.cols), GFP_KERNEL);
+	if (!tp->prompt) {
+		rc = -ENOMEM;
+		goto out_free_input;
+	}
+
+	tp->rcl_lines = tty3270_alloc_recall(tp->view.cols);
+	if (!tp->rcl_lines) {
+		rc = -ENOMEM;
+		goto out_free_prompt;
+	}
+
+	/* Create blank line for every line in the tty output area. */
+	tty3270_blank_screen(tp);
+
+	tp->kbd->port = &tp->port;
+	tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
+	tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
+	tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
+	tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
+	kbd_ascebc(tp->kbd, tp->view.ascebc);
+
+	raw3270_activate_view(&tp->view);
+	raw3270_put_view(&tp->view);
+	*newtp = tp;
+	return 0;
+
+out_free_prompt:
+	kfree(tp->prompt);
+out_free_input:
+	kfree(tp->input);
+out_free_converted_line:
+	free_page((unsigned long)tp->converted_line);
+out_free_screen:
+	tty3270_free_screen(tp->screen, tp->view.rows);
+out_put_view:
+	raw3270_put_view(&tp->view);
+	raw3270_del_view(&tp->view);
+out_free_view:
+	tty3270_free_view(tp);
+	return rc;
+}
+
+/*
+ * This routine is called whenever a 3270 tty is opened first time.
+ */
+static int
+tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+	struct raw3270_view *view;
+	struct tty3270 *tp;
+	int rc;
+
+	/* Check if the tty3270 is already there. */
+	view = raw3270_find_view(&tty3270_fn, tty->index + RAW3270_FIRSTMINOR);
+	if (IS_ERR(view)) {
+		rc = tty3270_create_view(tty->index, &tp);
+		if (rc)
+			return rc;
+	} else {
+		tp = container_of(view, struct tty3270, view);
+		tty->driver_data = tp;
+		tp->inattr = TF_INPUT;
+	}
+
+	tty->winsize.ws_row = tty3270_tty_rows(tp);
+	tty->winsize.ws_col = tp->view.cols;
+	rc = tty_port_install(&tp->port, driver, tty);
+	if (rc) {
+		raw3270_put_view(&tp->view);
+		return rc;
+	}
+	tty->driver_data = tp;
+	return 0;
+}
+
+/*
+ * This routine is called whenever a 3270 tty is opened.
+ */
+static int tty3270_open(struct tty_struct *tty, struct file *filp)
+{
+	struct tty3270 *tp = tty->driver_data;
+	struct tty_port *port = &tp->port;
+
+	port->count++;
+	tty_port_tty_set(port, tty);
+	return 0;
+}
+
+/*
+ * This routine is called when the 3270 tty is closed. We wait
+ * for the remaining request to be completed. Then we clean up.
+ */
+static void tty3270_close(struct tty_struct *tty, struct file *filp)
 {
-	if (!list_empty(&cp->cline->list))
-		/* Already added. */
+	struct tty3270 *tp = tty->driver_data;
+
+	if (tty->count > 1)
 		return;
-	list_add_tail(&cp->cline->list, &cp->lines);
-	cp->nr_lines++;
-	con3270_rebuild_update(cp);
+	if (tp)
+		tty_port_tty_set(&tp->port, NULL);
+}
+
+static void tty3270_cleanup(struct tty_struct *tty)
+{
+	struct tty3270 *tp = tty->driver_data;
+
+	if (tp) {
+		tty->driver_data = NULL;
+		raw3270_put_view(&tp->view);
+	}
+}
+
+/*
+ * We always have room.
+ */
+static unsigned int tty3270_write_room(struct tty_struct *tty)
+{
+	return INT_MAX;
 }
 
-static inline void
-con3270_cline_insert(struct con3270 *cp, unsigned char c)
+/*
+ * Insert character into the screen at the current position with the
+ * current color and highlight. This function does NOT do cursor movement.
+ */
+static void tty3270_put_character(struct tty3270 *tp, char ch)
 {
-	cp->cline->string[cp->cline->len++] = 
-		cp->view.ascebc[(c < ' ') ? ' ' : c];
-	if (list_empty(&cp->cline->update)) {
-		list_add_tail(&cp->cline->update, &cp->update);
-		cp->update_flags |= CON_UPDATE_LIST;
+	struct tty3270_line *line;
+	struct tty3270_cell *cell;
+
+	line = tty3270_get_write_line(tp, tp->cy);
+	if (line->len <= tp->cx) {
+		while (line->len < tp->cx) {
+			cell = line->cells + line->len;
+			cell->character = ' ';
+			cell->attributes = tp->attributes;
+			line->len++;
+		}
+		line->len++;
 	}
+	cell = line->cells + tp->cx;
+	cell->character = ch;
+	cell->attributes = tp->attributes;
+	line->dirty = 1;
+}
+
+/*
+ * Do carriage return.
+ */
+static void tty3270_cr(struct tty3270 *tp)
+{
+	tp->cx = 0;
 }
 
-static inline void
-con3270_cline_end(struct con3270 *cp)
+/*
+ * Do line feed.
+ */
+static void tty3270_lf(struct tty3270 *tp)
 {
-	struct string *s;
-	unsigned int size;
+	struct tty3270_line *line;
+	int i;
 
-	/* Copy cline. */
-	size = (cp->cline->len < cp->view.cols - 5) ?
-		cp->cline->len + 4 : cp->view.cols;
-	s = con3270_alloc_string(cp, size);
-	memcpy(s->string, cp->cline->string, cp->cline->len);
-	if (cp->cline->len < cp->view.cols - 5) {
-		s->string[s->len - 4] = TO_RA;
-		s->string[s->len - 1] = 0;
+	if (tp->cy < tty3270_tty_rows(tp) - 1) {
+		tp->cy++;
 	} else {
-		while (--size >= cp->cline->len)
-			s->string[size] = cp->view.ascebc[' '];
+		tp->line_view_start = tty3270_line_increment(tp, tp->line_view_start, 1);
+		tp->line_write_start = tty3270_line_increment(tp, tp->line_write_start, 1);
+		for (i = 0; i < tty3270_tty_rows(tp); i++)
+			tty3270_get_view_line(tp, i)->dirty = 1;
+	}
+
+	line = tty3270_get_write_line(tp, tp->cy);
+	line->len = 0;
+	line->dirty = 1;
+}
+
+static void tty3270_ri(struct tty3270 *tp)
+{
+	if (tp->cy > 0)
+		tp->cy--;
+}
+
+static void tty3270_reset_cell(struct tty3270 *tp, struct tty3270_cell *cell)
+{
+	cell->character = ' ';
+	tty3270_reset_attributes(&cell->attributes);
+}
+
+/*
+ * Insert characters at current position.
+ */
+static void tty3270_insert_characters(struct tty3270 *tp, int n)
+{
+	struct tty3270_line *line;
+	int k;
+
+	line = tty3270_get_write_line(tp, tp->cy);
+	while (line->len < tp->cx)
+		tty3270_reset_cell(tp, &line->cells[line->len++]);
+	if (n > tp->view.cols - tp->cx)
+		n = tp->view.cols - tp->cx;
+	k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
+	while (k--)
+		line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
+	line->len += n;
+	if (line->len > tp->view.cols)
+		line->len = tp->view.cols;
+	while (n-- > 0) {
+		line->cells[tp->cx + n].character = ' ';
+		line->cells[tp->cx + n].attributes = tp->attributes;
+	}
+}
+
+/*
+ * Delete characters at current position.
+ */
+static void tty3270_delete_characters(struct tty3270 *tp, int n)
+{
+	struct tty3270_line *line;
+	int i;
+
+	line = tty3270_get_write_line(tp, tp->cy);
+	if (line->len <= tp->cx)
+		return;
+	if (line->len - tp->cx <= n) {
+		line->len = tp->cx;
+		return;
+	}
+	for (i = tp->cx; i + n < line->len; i++)
+		line->cells[i] = line->cells[i + n];
+	line->len -= n;
+}
+
+/*
+ * Erase characters at current position.
+ */
+static void tty3270_erase_characters(struct tty3270 *tp, int n)
+{
+	struct tty3270_line *line;
+	struct tty3270_cell *cell;
+
+	line = tty3270_get_write_line(tp, tp->cy);
+	while (line->len > tp->cx && n-- > 0) {
+		cell = line->cells + tp->cx++;
+		tty3270_reset_cell(tp, cell);
+	}
+	tp->cx += n;
+	tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
+}
+
+/*
+ * Erase line, 3 different cases:
+ *  Esc [ 0 K	Erase from current position to end of line inclusive
+ *  Esc [ 1 K	Erase from beginning of line to current position inclusive
+ *  Esc [ 2 K	Erase entire line (without moving cursor)
+ */
+static void tty3270_erase_line(struct tty3270 *tp, int mode)
+{
+	struct tty3270_line *line;
+	struct tty3270_cell *cell;
+	int i, start, end;
+
+	line = tty3270_get_write_line(tp, tp->cy);
+
+	switch (mode) {
+	case 0:
+		start = tp->cx;
+		end = tp->view.cols;
+		break;
+	case 1:
+		start = 0;
+		end = tp->cx;
+		break;
+	case 2:
+		start = 0;
+		end = tp->view.cols;
+		break;
+	default:
+		return;
+	}
+
+	for (i = start; i < end; i++) {
+		cell = line->cells + i;
+		tty3270_reset_cell(tp, cell);
+		cell->attributes.b_color = tp->attributes.b_color;
+	}
+
+	if (line->len <= end)
+		line->len = end;
+}
+
+/*
+ * Erase display, 3 different cases:
+ *  Esc [ 0 J	Erase from current position to bottom of screen inclusive
+ *  Esc [ 1 J	Erase from top of screen to current position inclusive
+ *  Esc [ 2 J	Erase entire screen (without moving the cursor)
+ */
+static void tty3270_erase_display(struct tty3270 *tp, int mode)
+{
+	struct tty3270_line *line;
+	int i, start, end;
+
+	switch (mode) {
+	case 0:
+		tty3270_erase_line(tp, 0);
+		start = tp->cy + 1;
+		end = tty3270_tty_rows(tp);
+		break;
+	case 1:
+		start = 0;
+		end = tp->cy;
+		tty3270_erase_line(tp, 1);
+		break;
+	case 2:
+		start = 0;
+		end = tty3270_tty_rows(tp);
+		break;
+	default:
+		return;
+	}
+	for (i = start; i < end; i++) {
+		line = tty3270_get_write_line(tp, i);
+		line->len = 0;
+		line->dirty = 1;
+	}
+}
+
+/*
+ * Set attributes found in an escape sequence.
+ *  Esc [ <attr> ; <attr> ; ... m
+ */
+static void tty3270_set_attributes(struct tty3270 *tp)
+{
+	int i, attr;
+
+	for (i = 0; i <= tp->esc_npar; i++) {
+		attr = tp->esc_par[i];
+		switch (attr) {
+		case 0:		/* Reset */
+			tty3270_reset_attributes(&tp->attributes);
+			break;
+		/* Highlight. */
+		case 4:		/* Start underlining. */
+			tp->attributes.highlight = TTY3270_HIGHLIGHT_UNDERSCORE;
+			break;
+		case 5:		/* Start blink. */
+			tp->attributes.highlight = TTY3270_HIGHLIGHT_BLINK;
+			break;
+		case 7:		/* Start reverse. */
+			tp->attributes.highlight = TTY3270_HIGHLIGHT_REVERSE;
+			break;
+		case 24:	/* End underlining */
+			tp->attributes.highlight &= ~TTY3270_HIGHLIGHT_UNDERSCORE;
+			break;
+		case 25:	/* End blink. */
+			tp->attributes.highlight &= ~TTY3270_HIGHLIGHT_BLINK;
+			break;
+		case 27:	/* End reverse. */
+			tp->attributes.highlight &= ~TTY3270_HIGHLIGHT_REVERSE;
+			break;
+		/* Foreground color. */
+		case 30:	/* Black */
+		case 31:	/* Red */
+		case 32:	/* Green */
+		case 33:	/* Yellow */
+		case 34:	/* Blue */
+		case 35:	/* Magenta */
+		case 36:	/* Cyan */
+		case 37:	/* White */
+		case 39:	/* Black */
+			tp->attributes.f_color = attr - 30;
+			break;
+		/* Background color. */
+		case 40:	/* Black */
+		case 41:	/* Red */
+		case 42:	/* Green */
+		case 43:	/* Yellow */
+		case 44:	/* Blue */
+		case 45:	/* Magenta */
+		case 46:	/* Cyan */
+		case 47:	/* White */
+		case 49:	/* Black */
+			tp->attributes.b_color = attr - 40;
+			break;
+		}
+	}
+}
+
+static inline int tty3270_getpar(struct tty3270 *tp, int ix)
+{
+	return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
+}
+
+static void tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
+{
+	struct tty3270_line *line;
+	struct tty3270_cell *cell;
+	int max_cx = max(0, cx);
+	int max_cy = max(0, cy);
+
+	tp->cx = min_t(int, tp->view.cols - 1, max_cx);
+	line = tty3270_get_write_line(tp, tp->cy);
+	while (line->len < tp->cx) {
+		cell = line->cells + line->len;
+		cell->character = ' ';
+		cell->attributes = tp->attributes;
+		line->len++;
+	}
+	tp->cy = min_t(int, tty3270_tty_rows(tp) - 1, max_cy);
+}
+
+/*
+ * Process escape sequences. Known sequences:
+ *  Esc 7			Save Cursor Position
+ *  Esc 8			Restore Cursor Position
+ *  Esc [ Pn ; Pn ; .. m	Set attributes
+ *  Esc [ Pn ; Pn H		Cursor Position
+ *  Esc [ Pn ; Pn f		Cursor Position
+ *  Esc [ Pn A			Cursor Up
+ *  Esc [ Pn B			Cursor Down
+ *  Esc [ Pn C			Cursor Forward
+ *  Esc [ Pn D			Cursor Backward
+ *  Esc [ Pn G			Cursor Horizontal Absolute
+ *  Esc [ Pn X			Erase Characters
+ *  Esc [ Ps J			Erase in Display
+ *  Esc [ Ps K			Erase in Line
+ * // FIXME: add all the new ones.
+ *
+ *  Pn is a numeric parameter, a string of zero or more decimal digits.
+ *  Ps is a selective parameter.
+ */
+static void tty3270_escape_sequence(struct tty3270 *tp, char ch)
+{
+	enum { ES_NORMAL, ES_ESC, ES_SQUARE, ES_PAREN, ES_GETPARS };
+
+	if (tp->esc_state == ES_NORMAL) {
+		if (ch == 0x1b)
+			/* Starting new escape sequence. */
+			tp->esc_state = ES_ESC;
+		return;
+	}
+	if (tp->esc_state == ES_ESC) {
+		tp->esc_state = ES_NORMAL;
+		switch (ch) {
+		case '[':
+			tp->esc_state = ES_SQUARE;
+			break;
+		case '(':
+			tp->esc_state = ES_PAREN;
+			break;
+		case 'E':
+			tty3270_cr(tp);
+			tty3270_lf(tp);
+			break;
+		case 'M':
+			tty3270_ri(tp);
+			break;
+		case 'D':
+			tty3270_lf(tp);
+			break;
+		case 'Z':		/* Respond ID. */
+			kbd_puts_queue(&tp->port, "\033[?6c");
+			break;
+		case '7':		/* Save cursor position. */
+			tp->saved_cx = tp->cx;
+			tp->saved_cy = tp->cy;
+			tp->saved_attributes = tp->attributes;
+			break;
+		case '8':		/* Restore cursor position. */
+			tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
+			tp->attributes = tp->saved_attributes;
+			break;
+		case 'c':		/* Reset terminal. */
+			tp->cx = 0;
+			tp->cy = 0;
+			tp->saved_cx = 0;
+			tp->saved_cy = 0;
+			tty3270_reset_attributes(&tp->attributes);
+			tty3270_reset_attributes(&tp->saved_attributes);
+			tty3270_erase_display(tp, 2);
+			break;
+		}
+		return;
+	}
+
+	switch (tp->esc_state) {
+	case ES_PAREN:
+		tp->esc_state = ES_NORMAL;
+		switch (ch) {
+		case 'B':
+			tp->attributes.alternate_charset = 0;
+			break;
+		case '0':
+			tp->attributes.alternate_charset = 1;
+			break;
+		}
+		return;
+	case ES_SQUARE:
+		tp->esc_state = ES_GETPARS;
+		memset(tp->esc_par, 0, sizeof(tp->esc_par));
+		tp->esc_npar = 0;
+		tp->esc_ques = (ch == '?');
+		if (tp->esc_ques)
+			return;
+		fallthrough;
+	case ES_GETPARS:
+		if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
+			tp->esc_npar++;
+			return;
+		}
+		if (ch >= '0' && ch <= '9') {
+			tp->esc_par[tp->esc_npar] *= 10;
+			tp->esc_par[tp->esc_npar] += ch - '0';
+			return;
+		}
+		break;
+	default:
+		break;
+	}
+	tp->esc_state = ES_NORMAL;
+	if (ch == 'n' && !tp->esc_ques) {
+		if (tp->esc_par[0] == 5)		/* Status report. */
+			kbd_puts_queue(&tp->port, "\033[0n");
+		else if (tp->esc_par[0] == 6) {	/* Cursor report. */
+			char buf[40];
+
+			sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
+			kbd_puts_queue(&tp->port, buf);
+		}
+		return;
+	}
+	if (tp->esc_ques)
+		return;
+	switch (ch) {
+	case 'm':
+		tty3270_set_attributes(tp);
+		break;
+	case 'H':	/* Set cursor position. */
+	case 'f':
+		tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
+				tty3270_getpar(tp, 0) - 1);
+		break;
+	case 'd':	/* Set y position. */
+		tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
+		break;
+	case 'A':	/* Cursor up. */
+	case 'F':
+		tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
+		break;
+	case 'B':	/* Cursor down. */
+	case 'e':
+	case 'E':
+		tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
+		break;
+	case 'C':	/* Cursor forward. */
+	case 'a':
+		tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
+		break;
+	case 'D':	/* Cursor backward. */
+		tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
+		break;
+	case 'G':	/* Set x position. */
+	case '`':
+		tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
+		break;
+	case 'X':	/* Erase Characters. */
+		tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
+		break;
+	case 'J':	/* Erase display. */
+		tty3270_erase_display(tp, tp->esc_par[0]);
+		break;
+	case 'K':	/* Erase line. */
+		tty3270_erase_line(tp, tp->esc_par[0]);
+		break;
+	case 'P':	/* Delete characters. */
+		tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
+		break;
+	case '@':	/* Insert characters. */
+		tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
+		break;
+	case 's':	/* Save cursor position. */
+		tp->saved_cx = tp->cx;
+		tp->saved_cy = tp->cy;
+		tp->saved_attributes = tp->attributes;
+		break;
+	case 'u':	/* Restore cursor position. */
+		tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
+		tp->attributes = tp->saved_attributes;
+		break;
+	}
+}
+
+/*
+ * String write routine for 3270 ttys
+ */
+static void tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
+			     const unsigned char *buf, int count)
+{
+	int i_msg, i;
+
+	spin_lock_irq(&tp->view.lock);
+	for (i_msg = 0; !tty->flow.stopped && i_msg < count; i_msg++) {
+		if (tp->esc_state != 0) {
+			/* Continue escape sequence. */
+			tty3270_escape_sequence(tp, buf[i_msg]);
+			continue;
+		}
+
+		switch (buf[i_msg]) {
+		case 0x00:
+			break;
+		case 0x07:		/* '\a' -- Alarm */
+			tp->wcc |= TW_PLUSALARM;
+			break;
+		case 0x08:		/* Backspace. */
+			if (tp->cx > 0) {
+				tp->cx--;
+				tty3270_put_character(tp, ' ');
+			}
+			break;
+		case 0x09:		/* '\t' -- Tabulate */
+			for (i = tp->cx % 8; i < 8; i++) {
+				if (tp->cx >= tp->view.cols) {
+					tty3270_cr(tp);
+					tty3270_lf(tp);
+					break;
+				}
+				tty3270_put_character(tp, ' ');
+				tp->cx++;
+			}
+			break;
+		case 0x0a:		/* '\n' -- New Line */
+			tty3270_cr(tp);
+			tty3270_lf(tp);
+			break;
+		case 0x0c:		/* '\f' -- Form Feed */
+			tty3270_erase_display(tp, 2);
+			tp->cx = 0;
+			tp->cy = 0;
+			break;
+		case 0x0d:		/* '\r' -- Carriage Return */
+			tp->cx = 0;
+			break;
+		case 0x0e:
+			tp->attributes.alternate_charset = 1;
+			break;
+		case 0x0f:		/* SuSE "exit alternate mode" */
+			tp->attributes.alternate_charset = 0;
+			break;
+		case 0x1b:		/* Start escape sequence. */
+			tty3270_escape_sequence(tp, buf[i_msg]);
+			break;
+		default:		/* Insert normal character. */
+			if (tp->cx >= tp->view.cols) {
+				tty3270_cr(tp);
+				tty3270_lf(tp);
+			}
+			tty3270_put_character(tp, buf[i_msg]);
+			tp->cx++;
+			break;
+		}
+	}
+	/* Setup timer to update display after 1/10 second */
+	tp->update_flags |= TTY_UPDATE_LINES;
+	if (!timer_pending(&tp->timer))
+		tty3270_set_timer(tp, msecs_to_jiffies(100));
+
+	spin_unlock_irq(&tp->view.lock);
+}
+
+/*
+ * String write routine for 3270 ttys
+ */
+static int tty3270_write(struct tty_struct *tty,
+			 const unsigned char *buf, int count)
+{
+	struct tty3270 *tp;
+
+	tp = tty->driver_data;
+	if (!tp)
+		return 0;
+	if (tp->char_count > 0) {
+		tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
+		tp->char_count = 0;
+	}
+	tty3270_do_write(tp, tty, buf, count);
+	return count;
+}
+
+/*
+ * Put single characters to the ttys character buffer
+ */
+static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	struct tty3270 *tp;
+
+	tp = tty->driver_data;
+	if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
+		return 0;
+	tp->char_buf[tp->char_count++] = ch;
+	return 1;
+}
+
+/*
+ * Flush all characters from the ttys characeter buffer put there
+ * by tty3270_put_char.
+ */
+static void tty3270_flush_chars(struct tty_struct *tty)
+{
+	struct tty3270 *tp;
+
+	tp = tty->driver_data;
+	if (!tp)
+		return;
+	if (tp->char_count > 0) {
+		tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
+		tp->char_count = 0;
 	}
-	/* Replace cline with allocated line s and reset cline. */
-	list_add(&s->list, &cp->cline->list);
-	list_del_init(&cp->cline->list);
-	if (!list_empty(&cp->cline->update)) {
-		list_add(&s->update, &cp->cline->update);
-		list_del_init(&cp->cline->update);
+}
+
+/*
+ * Check for visible/invisible input switches
+ */
+static void tty3270_set_termios(struct tty_struct *tty, const struct ktermios *old)
+{
+	struct tty3270 *tp;
+	int new;
+
+	tp = tty->driver_data;
+	if (!tp)
+		return;
+	spin_lock_irq(&tp->view.lock);
+	if (L_ICANON(tty)) {
+		new = L_ECHO(tty) ? TF_INPUT : TF_INPUTN;
+		if (new != tp->inattr) {
+			tp->inattr = new;
+			tty3270_update_prompt(tp, "");
+			tty3270_set_timer(tp, 1);
+		}
 	}
-	cp->cline->len = 0;
+	spin_unlock_irq(&tp->view.lock);
 }
 
 /*
- * Write a string to the 3270 console
+ * Disable reading from a 3270 tty
  */
+static void tty3270_throttle(struct tty_struct *tty)
+{
+	struct tty3270 *tp;
+
+	tp = tty->driver_data;
+	if (!tp)
+		return;
+	tp->throttle = 1;
+}
+
+/*
+ * Enable reading from a 3270 tty
+ */
+static void tty3270_unthrottle(struct tty_struct *tty)
+{
+	struct tty3270 *tp;
+
+	tp = tty->driver_data;
+	if (!tp)
+		return;
+	tp->throttle = 0;
+	if (tp->attn)
+		tty3270_issue_read(tp, 1);
+}
+
+/*
+ * Hang up the tty device.
+ */
+static void tty3270_hangup(struct tty_struct *tty)
+{
+	struct tty3270 *tp;
+
+	tp = tty->driver_data;
+	if (!tp)
+		return;
+	spin_lock_irq(&tp->view.lock);
+	tp->cx = 0;
+	tp->cy = 0;
+	tp->saved_cx = 0;
+	tp->saved_cy = 0;
+	tty3270_reset_attributes(&tp->attributes);
+	tty3270_reset_attributes(&tp->saved_attributes);
+	tty3270_blank_screen(tp);
+	tp->update_flags = TTY_UPDATE_ALL;
+	spin_unlock_irq(&tp->view.lock);
+	tty3270_set_timer(tp, 1);
+}
+
+static void tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+}
+
+static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
+			 unsigned long arg)
+{
+	struct tty3270 *tp;
+
+	tp = tty->driver_data;
+	if (!tp)
+		return -ENODEV;
+	if (tty_io_error(tty))
+		return -EIO;
+	return kbd_ioctl(tp->kbd, cmd, arg);
+}
+
+#ifdef CONFIG_COMPAT
+static long tty3270_compat_ioctl(struct tty_struct *tty,
+				 unsigned int cmd, unsigned long arg)
+{
+	struct tty3270 *tp;
+
+	tp = tty->driver_data;
+	if (!tp)
+		return -ENODEV;
+	if (tty_io_error(tty))
+		return -EIO;
+	return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static const struct tty_operations tty3270_ops = {
+	.install = tty3270_install,
+	.cleanup = tty3270_cleanup,
+	.open = tty3270_open,
+	.close = tty3270_close,
+	.write = tty3270_write,
+	.put_char = tty3270_put_char,
+	.flush_chars = tty3270_flush_chars,
+	.write_room = tty3270_write_room,
+	.throttle = tty3270_throttle,
+	.unthrottle = tty3270_unthrottle,
+	.hangup = tty3270_hangup,
+	.wait_until_sent = tty3270_wait_until_sent,
+	.ioctl = tty3270_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = tty3270_compat_ioctl,
+#endif
+	.set_termios = tty3270_set_termios
+};
+
+static void tty3270_create_cb(int minor)
+{
+	tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
+}
+
+static void tty3270_destroy_cb(int minor)
+{
+	tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
+}
+
+static struct raw3270_notifier tty3270_notifier = {
+	.create = tty3270_create_cb,
+	.destroy = tty3270_destroy_cb,
+};
+
+/*
+ * 3270 tty registration code called from tty_init().
+ * Most kernel services (incl. kmalloc) are available at this poimt.
+ */
+static int __init tty3270_init(void)
+{
+	struct tty_driver *driver;
+	int ret;
+
+	driver = tty_alloc_driver(RAW3270_MAXDEVS,
+				  TTY_DRIVER_REAL_RAW |
+				  TTY_DRIVER_DYNAMIC_DEV |
+				  TTY_DRIVER_RESET_TERMIOS);
+	if (IS_ERR(driver))
+		return PTR_ERR(driver);
+
+	/*
+	 * Initialize the tty_driver structure
+	 * Entries in tty3270_driver that are NOT initialized:
+	 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
+	 */
+	driver->driver_name = "tty3270";
+	driver->name = "3270/tty";
+	driver->major = IBM_TTY3270_MAJOR;
+	driver->minor_start = RAW3270_FIRSTMINOR;
+	driver->name_base = RAW3270_FIRSTMINOR;
+	driver->type = TTY_DRIVER_TYPE_SYSTEM;
+	driver->subtype = SYSTEM_TYPE_TTY;
+	driver->init_termios = tty_std_termios;
+	tty_set_operations(driver, &tty3270_ops);
+	ret = tty_register_driver(driver);
+	if (ret) {
+		tty_driver_kref_put(driver);
+		return ret;
+	}
+	tty3270_driver = driver;
+	raw3270_register_notifier(&tty3270_notifier);
+	return 0;
+}
+
+static void __exit tty3270_exit(void)
+{
+	struct tty_driver *driver;
+
+	raw3270_unregister_notifier(&tty3270_notifier);
+	driver = tty3270_driver;
+	tty3270_driver = NULL;
+	tty_unregister_driver(driver);
+	tty_driver_kref_put(driver);
+	tty3270_del_views();
+}
+
+#if IS_ENABLED(CONFIG_TN3270_CONSOLE)
+
+static struct tty3270 *condev;
+
 static void
 con3270_write(struct console *co, const char *str, unsigned int count)
 {
-	struct con3270 *cp;
+	struct tty3270 *tp = co->data;
 	unsigned long flags;
-	unsigned char c;
+	char c;
 
-	cp = condev;
-	spin_lock_irqsave(&cp->view.lock, flags);
-	while (count-- > 0) {
+	spin_lock_irqsave(&tp->view.lock, flags);
+	while (count--) {
 		c = *str++;
-		if (cp->cline->len == 0)
-			con3270_cline_add(cp);
-		if (c != '\n')
-			con3270_cline_insert(cp, c);
-		if (c == '\n' || cp->cline->len >= cp->view.cols)
-			con3270_cline_end(cp);
+		if (c == 0x0a) {
+			tty3270_cr(tp);
+			tty3270_lf(tp);
+		} else {
+			if (tp->cx >= tp->view.cols) {
+				tty3270_cr(tp);
+				tty3270_lf(tp);
+			}
+			tty3270_put_character(tp, c);
+			tp->cx++;
+		}
 	}
-	/* Setup timer to output current console buffer after 1/10 second */
-	cp->nr_up = 0;
-	if (cp->view.dev && !timer_pending(&cp->timer))
-		con3270_set_timer(cp, HZ/10);
-	spin_unlock_irqrestore(&cp->view.lock,flags);
+	spin_unlock_irqrestore(&tp->view.lock, flags);
 }
 
 static struct tty_driver *
@@ -522,14 +2079,11 @@ con3270_device(struct console *c, int *index)
 	return tty3270_driver;
 }
 
-/*
- * Wait for end of write request.
- */
 static void
-con3270_wait_write(struct con3270 *cp)
+con3270_wait_write(struct tty3270 *tp)
 {
-	while (!cp->write) {
-		raw3270_wait_cons_dev(cp->view.dev);
+	while (!tp->write) {
+		raw3270_wait_cons_dev(tp->view.dev);
 		barrier();
 	}
 }
@@ -545,28 +2099,30 @@ con3270_wait_write(struct con3270 *cp)
 static int con3270_notify(struct notifier_block *self,
 			  unsigned long event, void *data)
 {
-	struct con3270 *cp;
+	struct tty3270 *tp;
 	unsigned long flags;
+	int rc;
 
-	cp = condev;
-	if (!cp->view.dev)
+	tp = condev;
+	if (!tp->view.dev)
 		return NOTIFY_DONE;
-	if (!raw3270_view_lock_unavailable(&cp->view))
-		raw3270_activate_view(&cp->view);
-	if (!spin_trylock_irqsave(&cp->view.lock, flags))
+	if (!raw3270_view_lock_unavailable(&tp->view)) {
+		rc = raw3270_activate_view(&tp->view);
+		if (rc)
+			return NOTIFY_DONE;
+	}
+	if (!spin_trylock_irqsave(&tp->view.lock, flags))
 		return NOTIFY_DONE;
-	con3270_wait_write(cp);
-	cp->nr_up = 0;
-	con3270_rebuild_update(cp);
-	con3270_update_status(cp);
-	while (cp->update_flags != 0) {
-		spin_unlock_irqrestore(&cp->view.lock, flags);
-		con3270_update(&cp->timer);
-		spin_lock_irqsave(&cp->view.lock, flags);
-		con3270_wait_write(cp);
-	}
-	spin_unlock_irqrestore(&cp->view.lock, flags);
-
+	con3270_wait_write(tp);
+	tp->nr_up = 0;
+	tp->update_flags = TTY_UPDATE_ALL;
+	while (tp->update_flags != 0) {
+		spin_unlock_irqrestore(&tp->view.lock, flags);
+		tty3270_update(&tp->timer);
+		spin_lock_irqsave(&tp->view.lock, flags);
+		con3270_wait_write(tp);
+	}
+	spin_unlock_irqrestore(&tp->view.lock, flags);
 	return NOTIFY_DONE;
 }
 
@@ -580,9 +2136,6 @@ static struct notifier_block on_reboot_nb = {
 	.priority = INT_MIN + 1, /* run the callback late */
 };
 
-/*
- *  The console structure for the 3270 console
- */
 static struct console con3270 = {
 	.name	 = "tty3270",
 	.write	 = con3270_write,
@@ -590,15 +2143,13 @@ static struct console con3270 = {
 	.flags	 = CON_PRINTBUFFER,
 };
 
-/*
- * 3270 console initialization code called from console_init().
- */
 static int __init
 con3270_init(void)
 {
+	struct raw3270_view *view;
 	struct raw3270 *rp;
-	void *cbuf;
-	int i;
+	struct tty3270 *tp;
+	int rc;
 
 	/* Check if 3270 is to be the console */
 	if (!CONSOLE_IS_3270)
@@ -614,38 +2165,28 @@ con3270_init(void)
 	if (IS_ERR(rp))
 		return PTR_ERR(rp);
 
-	condev = kzalloc(sizeof(struct con3270), GFP_KERNEL | GFP_DMA);
-	if (!condev)
-		return -ENOMEM;
-	condev->view.dev = rp;
-
-	condev->read = raw3270_request_alloc(0);
-	condev->read->callback = con3270_read_callback;
-	condev->read->callback_data = condev;
-	condev->write = raw3270_request_alloc(CON3270_OUTPUT_BUFFER_SIZE);
-	condev->kreset = raw3270_request_alloc(1);
-
-	INIT_LIST_HEAD(&condev->lines);
-	INIT_LIST_HEAD(&condev->update);
-	timer_setup(&condev->timer, con3270_update, 0);
-	tasklet_init(&condev->readlet, con3270_read_tasklet,
-		     (unsigned long) condev->read);
-
-	raw3270_add_view(&condev->view, &con3270_fn, 1, RAW3270_VIEW_LOCK_IRQ);
-
-	INIT_LIST_HEAD(&condev->freemem);
-	for (i = 0; i < CON3270_STRING_PAGES; i++) {
-		cbuf = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
-		add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
-	}
-	condev->cline = alloc_string(&condev->freemem, condev->view.cols);
-	condev->cline->len = 0;
-	con3270_create_status(condev);
-	condev->input = alloc_string(&condev->freemem, 80);
+	/* Check if the tty3270 is already there. */
+	view = raw3270_find_view(&tty3270_fn, RAW3270_FIRSTMINOR);
+	if (IS_ERR(view)) {
+		rc = tty3270_create_view(0, &tp);
+		if (rc)
+			return rc;
+	} else {
+		tp = container_of(view, struct tty3270, view);
+		tp->inattr = TF_INPUT;
+	}
+	con3270.data = tp;
+	condev = tp;
 	atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 	register_reboot_notifier(&on_reboot_nb);
 	register_console(&con3270);
 	return 0;
 }
-
 console_initcall(con3270_init);
+#endif
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
+
+module_init(tty3270_init);
+module_exit(tty3270_exit);