[PATCH] fbcon: Console Rotation - Prepare fbcon for console rotation

This patch series implements generic code to rotate the console at 90, 180,
and 270 degrees. The implementation is completely done in the framebuffer
console level, thus no changes to the framebuffer layer or to the drivers
are needed.

Console rotation is required by some Sharp-based devices where the natural
orientation of the display is not at 0 degrees. Also, users that have
displays that can pivot will benefit by having a console in portrait mode
if they so desire.

The choice to implement the code in the console layer rather than in the
framebuffer layer is due to the following reasons:

- it's fast
- it does not require driver changes
- it can coexist with devices that can rotate the display at the hardware level
- it complements graphics applications that can do display rotation

The changes to core fbcon are minimal-- recognition of the console
rotation angle so it can swap directions, origins and axes (xres vs yres,
xpanstep vs ypanstep, xoffset vs yoffset, etc) and storage of the rotation
angle per display. The bulk of the code that does the actual drawing to the
screen are placed in separate files. Each angle of rotation has separate
methods (bmove, clear, putcs, cursor, update_start which is derived from
update_var, and clear_margins).  To mimimize processing time, the fontdata
are pre-rotated at each console switch (only if the font or the angle has
changed).

The option can be compiled out (CONFIG_FRAMEBUFFER_CONSOLE_ROTATION = n) if
rotation is not needed.

Choosing the rotation angle can be done in several ways:

1. boot option fbcon=rotate:n, where
     n = 0 - normal
     n = 1 - 90 degrees (clockwise)
     n = 2 - 180 degrees (upside down)
     n = 3 - 270 degrees (counterclockwise)

2. echo n > /sys/class/graphics/fb[num]/con_rotate

     where n is the same as described above. It sets the angle of rotation
of the current console

3 echo n > /sys/class/graphics/fb[num]/con_rotate_all

     where n is the same as described above. Globally sets the angle of
rotation.

GOTCHAS:

	The option, especially at angles of 90 and 270 degrees, will exercise
the least used code of drivers.  Namely, at these angles, panning is done
in the x-axis, so it can reveal bugs in the driver if xpanstep is set
incorrectly. A workaround is to set xpanstep = 0.

	Secondly, at these angles, the framebuffer memory access can be
unaligned if (fontheight * bpp) % 32 ~= 0 which can reveal bugs in the drivers
imageblit, fillrect and copyarea functions.  (I think cfbfillrect may have
this buglet). A workaround is to use a standard 8x16 font.

Speed:

	The scrolling speed difference between 0 and 180 degrees is minimal,
somewhere areound 1-2%.  At 90 or 270 degress, speed drops down to a vicinity
of 30-40%. This is understandable because the blit direction is across the
framebuffer "direction." Scrolling will be helped at these angles if xpanstep
is not equal to zero, use of 8x16 fonts, and setting xres_virtual >= xres * 2.

Note: The code is tested on little-endian only, so I don't know if it will
work in big-endian. Please let me know, it will take only less than a minute
of your time.

This patch prepares fbcon for console rotation and contains the following
changes:

- add rotate field in struct fbcon_ops to keep fbcon's current rotation
  angle

- add con_rotate field in struct display to store per-display rotation angle

- create a private copy of the current var to fbcon.  This will prevent
  fbcon from directly manipulating info->var, especially the fields xoffset,
  yoffset and vmode.

- add ability to swap pertinent axes (xres, yres; xpanstep, ypanstep; etc)
  depending on the rotation angle

- change global update_var() (function that sets the screen start address)
  as an fbcon method update_start.  This is required because the axes, start
  offset, and/or direction can be reversed depending on the rotation angle.

- add fbcon method rotate_font() which will rotate each character bitmap to
  the correct angle of rotation.

- add fbcon boot option 'rotate' to select the angle of rotation at bootime.
   Currently does nothing until all patches are applied.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

6 files changed, 286 insertions, 138 deletions

diff --git a/drivers/video/console/Kconfig b/drivers/video/console/Kconfig
index fadf7c5..94c5f13 100644
--- a/drivers/video/console/Kconfig
+++ b/drivers/video/console/Kconfig
@@ -101,6 +101,16 @@ config FRAMEBUFFER_CONSOLE
 	help
 	  Low-level framebuffer-based console driver.
 
+config FRAMEBUFFER_CONSOLE_ROTATION
+       bool "Framebuffer Console Rotation"
+       depends on FRAMEBUFFER_CONSOLE
+       help
+         Enable display rotation for the framebuffer console.  This is done
+         in software and may be significantly slower than a normally oriented
+         display.  Note that the rotation is done at the console level only
+         such that other users of the framebuffer will remain normally
+         oriented.
+
 config STI_CONSOLE
         tristate "STI text console" 
         depends on PARISC
diff --git a/drivers/video/console/bitblit.c b/drivers/video/console/bitblit.c
index 67857b3..e65fc3e 100644
--- a/drivers/video/console/bitblit.c
+++ b/drivers/video/console/bitblit.c
@@ -22,35 +22,6 @@
 /*
  * Accelerated handlers.
  */
-#define FBCON_ATTRIBUTE_UNDERLINE 1
-#define FBCON_ATTRIBUTE_REVERSE   2
-#define FBCON_ATTRIBUTE_BOLD      4
-
-static inline int real_y(struct display *p, int ypos)
-{
-	int rows = p->vrows;
-
-	ypos += p->yscroll;
-	return ypos < rows ? ypos : ypos - rows;
-}
-
-
-static inline int get_attribute(struct fb_info *info, u16 c)
-{
-	int attribute = 0;
-
-	if (fb_get_color_depth(&info->var, &info->fix) == 1) {
-		if (attr_underline(c))
-			attribute |= FBCON_ATTRIBUTE_UNDERLINE;
-		if (attr_reverse(c))
-			attribute |= FBCON_ATTRIBUTE_REVERSE;
-		if (attr_bold(c))
-			attribute |= FBCON_ATTRIBUTE_BOLD;
-	}
-
-	return attribute;
-}
-
 static inline void update_attr(u8 *dst, u8 *src, int attribute,
 			       struct vc_data *vc)
 {
@@ -418,6 +389,18 @@ static void bit_cursor(struct vc_data *vc, struct fb_info *info,
 	ops->cursor_reset = 0;
 }
 
+static int bit_update_start(struct fb_info *info)
+{
+	struct fbcon_ops *ops = info->fbcon_par;
+	int err;
+
+	err = fb_pan_display(info, &ops->var);
+	ops->var.xoffset = info->var.xoffset;
+	ops->var.yoffset = info->var.yoffset;
+	ops->var.vmode = info->var.vmode;
+	return err;
+}
+
 void fbcon_set_bitops(struct fbcon_ops *ops)
 {
 	ops->bmove = bit_bmove;
@@ -425,6 +408,11 @@ void fbcon_set_bitops(struct fbcon_ops *ops)
 	ops->putcs = bit_putcs;
 	ops->clear_margins = bit_clear_margins;
 	ops->cursor = bit_cursor;
+	ops->update_start = bit_update_start;
+	ops->rotate_font = NULL;
+
+	if (ops->rotate)
+		fbcon_set_rotate(ops);
 }
 
 EXPORT_SYMBOL(fbcon_set_bitops);
diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index 3cf1b61..b5d678c7 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -107,6 +107,8 @@ enum {
 };
 
 struct display fb_display[MAX_NR_CONSOLES];
+EXPORT_SYMBOL(fb_display);
+
 static signed char con2fb_map[MAX_NR_CONSOLES];
 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
 static int logo_height;
@@ -130,6 +132,9 @@ static char fontname[40];
 /* current fb_info */
 static int info_idx = -1;
 
+/* console rotation */
+static int rotate;
+
 static const struct consw fb_con;
 
 #define CM_SOFTBACK	(8)
@@ -176,7 +181,6 @@ static int fbcon_scrolldelta(struct vc_data *vc, int lines);
 /*
  *  Internal routines
  */
-static __inline__ int real_y(struct display *p, int ypos);
 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 static __inline__ void ypan_up(struct vc_data *vc, int count);
@@ -203,6 +207,13 @@ static irqreturn_t fb_vbl_detect(int irq, void *dummy, struct pt_regs *fp)
 }
 #endif
 
+static inline void fbcon_set_rotation(struct fb_info *info, struct display *p)
+{
+	struct fbcon_ops *ops = info->fbcon_par;
+
+	ops->rotate = FB_ROTATE_UR;
+}
+
 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 {
 	struct fbcon_ops *ops = info->fbcon_par;
@@ -422,6 +433,14 @@ static int __init fb_console_setup(char *this_opt)
 				last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 			fbcon_is_default = 0; 
 		}	
+
+		if (!strncmp(options, "rotate:", 7)) {
+			options += 7;
+			if (*options)
+				rotate = simple_strtoul(options, &options, 0);
+			if (rotate > 3)
+				rotate = 0;
+		}
 	}
 	return 0;
 }
@@ -558,16 +577,24 @@ static void set_blitting_type(struct vc_data *vc, struct fb_info *info,
 
 	if ((info->flags & FBINFO_MISC_TILEBLITTING))
 		fbcon_set_tileops(vc, info, p, ops);
-	else
+	else {
+		struct display *disp;
+
+		disp = (p) ? p : &fb_display[vc->vc_num];
+		fbcon_set_rotation(info, disp);
 		fbcon_set_bitops(ops);
+	}
 }
 #else
 static void set_blitting_type(struct vc_data *vc, struct fb_info *info,
 			      struct display *p)
 {
 	struct fbcon_ops *ops = info->fbcon_par;
+	struct display *disp;
 
 	info->flags &= ~FBINFO_MISC_TILEBLITTING;
+	disp = (p) ? p : &fb_display[vc->vc_num];
+	fbcon_set_rotation(info, disp);
 	fbcon_set_bitops(ops);
 }
 #endif /* CONFIG_MISC_TILEBLITTING */
@@ -627,6 +654,7 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 		fbcon_del_cursor_timer(oldinfo);
 		kfree(ops->cursor_state.mask);
 		kfree(ops->cursor_data);
+		kfree(ops->fontbuffer);
 		kfree(oldinfo->fbcon_par);
 		oldinfo->fbcon_par = NULL;
 		module_put(oldinfo->fbops->owner);
@@ -827,7 +855,9 @@ static const char *fbcon_startup(void)
 	memset(ops, 0, sizeof(struct fbcon_ops));
 	ops->currcon = -1;
 	ops->graphics = 1;
+	ops->cur_rotate = -1;
 	info->fbcon_par = ops;
+	p->con_rotate = rotate;
 	set_blitting_type(vc, info, NULL);
 
 	if (info->fix.type != FB_TYPE_TEXT) {
@@ -866,8 +896,10 @@ static const char *fbcon_startup(void)
 		vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
 	}
 
-	cols = info->var.xres / vc->vc_font.width;
-	rows = info->var.yres / vc->vc_font.height;
+	cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
+	rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
+	cols /= vc->vc_font.width;
+	rows /= vc->vc_font.height;
 	vc_resize(vc, cols, rows);
 
 	DPRINTK("mode:   %s\n", info->fix.id);
@@ -953,8 +985,6 @@ static void fbcon_init(struct vc_data *vc, int init)
 	    (info->fix.type == FB_TYPE_TEXT))
 		logo = 0;
 
-	info->var.xoffset = info->var.yoffset = p->yscroll = 0;	/* reset wrap/pan */
-
 	if (var_to_display(p, &info->var, info))
 		return;
 
@@ -986,13 +1016,18 @@ static void fbcon_init(struct vc_data *vc, int init)
 	if (!*vc->vc_uni_pagedir_loc)
 		con_copy_unimap(vc, svc);
 
+	ops = info->fbcon_par;
+	p->con_rotate = rotate;
+	set_blitting_type(vc, info, NULL);
+
 	cols = vc->vc_cols;
 	rows = vc->vc_rows;
-	new_cols = info->var.xres / vc->vc_font.width;
-	new_rows = info->var.yres / vc->vc_font.height;
+	new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
+	new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
+	new_cols /= vc->vc_font.width;
+	new_rows /= vc->vc_font.height;
 	vc_resize(vc, new_cols, new_rows);
 
-	ops = info->fbcon_par;
 	/*
 	 * We must always set the mode. The mode of the previous console
 	 * driver could be in the same resolution but we are using different
@@ -1030,6 +1065,12 @@ static void fbcon_init(struct vc_data *vc, int init)
 
 	if (vc == svc && softback_buf)
 		fbcon_update_softback(vc);
+
+	if (ops->rotate_font && ops->rotate_font(info, vc, p)) {
+		ops->rotate = FB_ROTATE_UR;
+		set_blitting_type(vc, info, p);
+	}
+
 }
 
 static void fbcon_deinit(struct vc_data *vc)
@@ -1066,15 +1107,6 @@ static void fbcon_deinit(struct vc_data *vc)
  *  restriction is simplicity & efficiency at the moment.
  */
 
-static __inline__ int real_y(struct display *p, int ypos)
-{
-	int rows = p->vrows;
-
-	ypos += p->yscroll;
-	return ypos < rows ? ypos : ypos - rows;
-}
-
-
 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 			int width)
 {
@@ -1162,13 +1194,6 @@ static int scrollback_phys_max = 0;
 static int scrollback_max = 0;
 static int scrollback_current = 0;
 
-static int update_var(int con, struct fb_info *info)
-{
-	if (con == ((struct fbcon_ops *)info->fbcon_par)->currcon)
-		return fb_pan_display(info, &info->var);
-	return 0;
-}
-
 /*
  * If no vc is existent yet, just set struct display
  */
@@ -1178,7 +1203,6 @@ static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *va
 	struct display *p = &fb_display[unit];
 	struct display *t = &fb_display[fg_console];
 
-	var->xoffset = var->yoffset = p->yscroll = 0;
 	if (var_to_display(p, var, info))
 		return;
 
@@ -1194,9 +1218,9 @@ static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 	struct display *p = &fb_display[vc->vc_num], *t;
 	struct vc_data **default_mode = vc->vc_display_fg;
 	struct vc_data *svc = *default_mode;
+	struct fbcon_ops *ops = info->fbcon_par;
 	int rows, cols, charcnt = 256;
 
-	var->xoffset = var->yoffset = p->yscroll = 0;
 	if (var_to_display(p, var, info))
 		return;
 	t = &fb_display[svc->vc_num];
@@ -1213,9 +1237,10 @@ static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 
 	var->activate = FB_ACTIVATE_NOW;
 	info->var.activate = var->activate;
-	info->var.yoffset = info->var.xoffset = 0;
+	var->yoffset = info->var.yoffset;
+	var->xoffset = info->var.xoffset;
 	fb_set_var(info, var);
-
+	ops->var = info->var;
 	vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
 	vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 	if (charcnt == 256) {
@@ -1231,9 +1256,12 @@ static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 	if (!*vc->vc_uni_pagedir_loc)
 		con_copy_unimap(vc, svc);
 
-	cols = var->xres / vc->vc_font.width;
-	rows = var->yres / vc->vc_font.height;
+	cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
+	rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
+	cols /= vc->vc_font.width;
+	rows /= vc->vc_font.height;
 	vc_resize(vc, cols, rows);
+
 	if (CON_IS_VISIBLE(vc)) {
 		update_screen(vc);
 		if (softback_buf)
@@ -1244,15 +1272,16 @@ static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 static __inline__ void ywrap_up(struct vc_data *vc, int count)
 {
 	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
+	struct fbcon_ops *ops = info->fbcon_par;
 	struct display *p = &fb_display[vc->vc_num];
 	
 	p->yscroll += count;
 	if (p->yscroll >= p->vrows)	/* Deal with wrap */
 		p->yscroll -= p->vrows;
-	info->var.xoffset = 0;
-	info->var.yoffset = p->yscroll * vc->vc_font.height;
-	info->var.vmode |= FB_VMODE_YWRAP;
-	update_var(vc->vc_num, info);
+	ops->var.xoffset = 0;
+	ops->var.yoffset = p->yscroll * vc->vc_font.height;
+	ops->var.vmode |= FB_VMODE_YWRAP;
+	ops->update_start(info);
 	scrollback_max += count;
 	if (scrollback_max > scrollback_phys_max)
 		scrollback_max = scrollback_phys_max;
@@ -1262,15 +1291,16 @@ static __inline__ void ywrap_up(struct vc_data *vc, int count)
 static __inline__ void ywrap_down(struct vc_data *vc, int count)
 {
 	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
+	struct fbcon_ops *ops = info->fbcon_par;
 	struct display *p = &fb_display[vc->vc_num];
 	
 	p->yscroll -= count;
 	if (p->yscroll < 0)	/* Deal with wrap */
 		p->yscroll += p->vrows;
-	info->var.xoffset = 0;
-	info->var.yoffset = p->yscroll * vc->vc_font.height;
-	info->var.vmode |= FB_VMODE_YWRAP;
-	update_var(vc->vc_num, info);
+	ops->var.xoffset = 0;
+	ops->var.yoffset = p->yscroll * vc->vc_font.height;
+	ops->var.vmode |= FB_VMODE_YWRAP;
+	ops->update_start(info);
 	scrollback_max -= count;
 	if (scrollback_max < 0)
 		scrollback_max = 0;
@@ -1289,10 +1319,11 @@ static __inline__ void ypan_up(struct vc_data *vc, int count)
 			    0, 0, 0, vc->vc_rows, vc->vc_cols);
 		p->yscroll -= p->vrows - vc->vc_rows;
 	}
-	info->var.xoffset = 0;
-	info->var.yoffset = p->yscroll * vc->vc_font.height;
-	info->var.vmode &= ~FB_VMODE_YWRAP;
-	update_var(vc->vc_num, info);
+
+	ops->var.xoffset = 0;
+	ops->var.yoffset = p->yscroll * vc->vc_font.height;
+	ops->var.vmode &= ~FB_VMODE_YWRAP;
+	ops->update_start(info);
 	fbcon_clear_margins(vc, 1);
 	scrollback_max += count;
 	if (scrollback_max > scrollback_phys_max)
@@ -1303,6 +1334,7 @@ static __inline__ void ypan_up(struct vc_data *vc, int count)
 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
 {
 	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
+	struct fbcon_ops *ops = info->fbcon_par;
 	struct display *p = &fb_display[vc->vc_num];
 	int redraw = 0;
 
@@ -1312,12 +1344,13 @@ static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
 		redraw = 1;
 	}
 
-	info->var.xoffset = 0;
-	info->var.yoffset = p->yscroll * vc->vc_font.height;
-	info->var.vmode &= ~FB_VMODE_YWRAP;
 	if (redraw)
 		fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
-	update_var(vc->vc_num, info);
+
+	ops->var.xoffset = 0;
+	ops->var.yoffset = p->yscroll * vc->vc_font.height;
+	ops->var.vmode &= ~FB_VMODE_YWRAP;
+	ops->update_start(info);
 	fbcon_clear_margins(vc, 1);
 	scrollback_max += count;
 	if (scrollback_max > scrollback_phys_max)
@@ -1337,10 +1370,11 @@ static __inline__ void ypan_down(struct vc_data *vc, int count)
 			    0, vc->vc_rows, vc->vc_cols);
 		p->yscroll += p->vrows - vc->vc_rows;
 	}
-	info->var.xoffset = 0;
-	info->var.yoffset = p->yscroll * vc->vc_font.height;
-	info->var.vmode &= ~FB_VMODE_YWRAP;
-	update_var(vc->vc_num, info);
+
+	ops->var.xoffset = 0;
+	ops->var.yoffset = p->yscroll * vc->vc_font.height;
+	ops->var.vmode &= ~FB_VMODE_YWRAP;
+	ops->update_start(info);
 	fbcon_clear_margins(vc, 1);
 	scrollback_max -= count;
 	if (scrollback_max < 0)
@@ -1351,6 +1385,7 @@ static __inline__ void ypan_down(struct vc_data *vc, int count)
 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
 {
 	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
+	struct fbcon_ops *ops = info->fbcon_par;
 	struct display *p = &fb_display[vc->vc_num];
 	int redraw = 0;
 
@@ -1359,12 +1394,14 @@ static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
 		p->yscroll += p->vrows - vc->vc_rows;
 		redraw = 1;
 	}
-	info->var.xoffset = 0;
-	info->var.yoffset = p->yscroll * vc->vc_font.height;
-	info->var.vmode &= ~FB_VMODE_YWRAP;
+
 	if (redraw)
 		fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
-	update_var(vc->vc_num, info);
+
+	ops->var.xoffset = 0;
+	ops->var.yoffset = p->yscroll * vc->vc_font.height;
+	ops->var.vmode &= ~FB_VMODE_YWRAP;
+	ops->update_start(info);
 	fbcon_clear_margins(vc, 1);
 	scrollback_max -= count;
 	if (scrollback_max < 0)
@@ -1838,31 +1875,41 @@ static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int s
 		   height, width);
 }
 
-static __inline__ void updatescrollmode(struct display *p, struct fb_info *info,
+static __inline__ void updatescrollmode(struct display *p,
+					struct fb_info *info,
 					struct vc_data *vc)
 {
+	struct fbcon_ops *ops = info->fbcon_par;
 	int fh = vc->vc_font.height;
 	int cap = info->flags;
-	int good_pan = (cap & FBINFO_HWACCEL_YPAN)
-		 && divides(info->fix.ypanstep, vc->vc_font.height)
-		 && info->var.yres_virtual > info->var.yres;
-	int good_wrap = (cap & FBINFO_HWACCEL_YWRAP)
-		 && divides(info->fix.ywrapstep, vc->vc_font.height)
-		 && divides(vc->vc_font.height, info->var.yres_virtual);
+	u16 t = 0;
+	int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
+				  info->fix.xpanstep);
+	int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
+	int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
+	int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
+				   info->var.xres_virtual);
+	int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
+		divides(ypan, vc->vc_font.height) && vyres > yres;
+	int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
+		divides(ywrap, vc->vc_font.height) &&
+		divides(vc->vc_font.height, vyres);
 	int reading_fast = cap & FBINFO_READS_FAST;
-	int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) && !(cap & FBINFO_HWACCEL_DISABLED);
-	int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) && !(cap & FBINFO_HWACCEL_DISABLED);
-
-	p->vrows = info->var.yres_virtual/fh;
-	if (info->var.yres > (fh * (vc->vc_rows + 1)))
-		p->vrows -= (info->var.yres - (fh * vc->vc_rows)) / fh;
-	if ((info->var.yres % fh) && (info->var.yres_virtual % fh <
-				      info->var.yres % fh))
+	int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
+		!(cap & FBINFO_HWACCEL_DISABLED);
+	int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
+		!(cap & FBINFO_HWACCEL_DISABLED);
+
+	p->vrows = vyres/fh;
+	if (yres > (fh * (vc->vc_rows + 1)))
+		p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
+	if ((yres % fh) && (vyres % fh < yres % fh))
 		p->vrows--;
 
 	if (good_wrap || good_pan) {
 		if (reading_fast || fast_copyarea)
-			p->scrollmode = good_wrap ? SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
+			p->scrollmode = good_wrap ?
+				SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
 		else
 			p->scrollmode = good_wrap ? SCROLL_REDRAW :
 				SCROLL_PAN_REDRAW;
@@ -1878,17 +1925,23 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
 			unsigned int height)
 {
 	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
+	struct fbcon_ops *ops = info->fbcon_par;
 	struct display *p = &fb_display[vc->vc_num];
 	struct fb_var_screeninfo var = info->var;
-	int x_diff, y_diff;
-	int fw = vc->vc_font.width;
-	int fh = vc->vc_font.height;
-
-	var.xres = width * fw;
-	var.yres = height * fh;
+	int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
+
+	virt_w = FBCON_SWAP(ops->rotate, width, height);
+	virt_h = FBCON_SWAP(ops->rotate, height, width);
+	virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
+				 vc->vc_font.height);
+	virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
+				 vc->vc_font.width);
+	var.xres = virt_w * virt_fw;
+	var.yres = virt_h * virt_fh;
 	x_diff = info->var.xres - var.xres;
 	y_diff = info->var.yres - var.yres;
-	if (x_diff < 0 || x_diff > fw || (y_diff < 0 || y_diff > fh)) {
+	if (x_diff < 0 || x_diff > virt_fw ||
+	    y_diff < 0 || y_diff > virt_fh) {
 		struct fb_videomode *mode;
 
 		DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
@@ -1898,7 +1951,7 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
 		display_to_var(&var, p);
 		fb_videomode_to_var(&var, mode);
 
-		if (width > var.xres/fw || height > var.yres/fh)
+		if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
 			return -EINVAL;
 
 		DPRINTK("resize now %ix%i\n", var.xres, var.yres);
@@ -1908,6 +1961,7 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
 			fb_set_var(info, &var);
 		}
 		var_to_display(p, &info->var, info);
+		ops->var = info->var;
 	}
 	updatescrollmode(p, info, vc);
 	return 0;
@@ -1916,11 +1970,13 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
 static int fbcon_switch(struct vc_data *vc)
 {
 	struct fb_info *info, *old_info = NULL;
+	struct fbcon_ops *ops;
 	struct display *p = &fb_display[vc->vc_num];
 	struct fb_var_screeninfo var;
 	int i, prev_console;
 
 	info = registered_fb[con2fb_map[vc->vc_num]];
+	ops = info->fbcon_par;
 
 	if (softback_top) {
 		if (softback_lines)
@@ -1939,7 +1995,7 @@ static int fbcon_switch(struct vc_data *vc)
 		logo_shown = FBCON_LOGO_CANSHOW;
 	}
 
-	prev_console = ((struct fbcon_ops *)info->fbcon_par)->currcon;
+	prev_console = ops->currcon;
 	if (prev_console != -1)
 		old_info = registered_fb[con2fb_map[prev_console]];
 	/*
@@ -1952,9 +2008,9 @@ static int fbcon_switch(struct vc_data *vc)
 	 */
 	for (i = 0; i < FB_MAX; i++) {
 		if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
-			struct fbcon_ops *ops = registered_fb[i]->fbcon_par;
+			struct fbcon_ops *o = registered_fb[i]->fbcon_par;
 
-			ops->currcon = vc->vc_num;
+			o->currcon = vc->vc_num;
 		}
 	}
 	memset(&var, 0, sizeof(struct fb_var_screeninfo));
@@ -1966,8 +2022,11 @@ static int fbcon_switch(struct vc_data *vc)
 	 * in fb_set_var()
 	 */
 	info->var.activate = var.activate;
-	info->var.yoffset = info->var.xoffset = p->yscroll = 0;
+	var.yoffset = info->var.yoffset;
+	var.xoffset = info->var.xoffset;
+	var.vmode = info->var.vmode;
 	fb_set_var(info, &var);
+	ops->var = info->var;
 
 	if (old_info != NULL && old_info != info) {
 		if (info->fbops->fb_set_par)
@@ -1977,7 +2036,12 @@ static int fbcon_switch(struct vc_data *vc)
 	}
 
 	set_blitting_type(vc, info, p);
-	((struct fbcon_ops *)info->fbcon_par)->cursor_reset = 1;
+	ops->cursor_reset = 1;
+
+	if (ops->rotate_font && ops->rotate_font(info, vc, p)) {
+		ops->rotate = FB_ROTATE_UR;
+		set_blitting_type(vc, info, p);
+	}
 
 	vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
 	vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
@@ -1997,10 +2061,11 @@ static int fbcon_switch(struct vc_data *vc)
 		scrollback_phys_max = 0;
 		break;
 	}
+
 	scrollback_max = 0;
 	scrollback_current = 0;
-
-	update_var(vc->vc_num, info);
+	ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
+	ops->update_start(info);
 	fbcon_set_palette(vc, color_table); 	
 	fbcon_clear_margins(vc, 0);
 
@@ -2047,6 +2112,7 @@ static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
 			var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
 			fb_set_var(info, &var);
 			ops->graphics = 0;
+			ops->var = info->var;
 		}
 	}
 
@@ -2135,6 +2201,7 @@ static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
 			     const u8 * data, int userfont)
 {
 	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
+	struct fbcon_ops *ops = info->fbcon_par;
 	struct display *p = &fb_display[vc->vc_num];
 	int resize;
 	int cnt;
@@ -2214,9 +2281,13 @@ static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
 	}
 
 	if (resize) {
-		/* reset wrap/pan */
-		info->var.xoffset = info->var.yoffset = p->yscroll = 0;
-		vc_resize(vc, info->var.xres / w, info->var.yres / h);
+		int cols, rows;
+
+		cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
+		rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
+		cols /= w;
+		rows /= h;
+		vc_resize(vc, cols, rows);
 		if (CON_IS_VISIBLE(vc) && softback_buf)
 			fbcon_update_softback(vc);
 	} else if (CON_IS_VISIBLE(vc)
@@ -2444,6 +2515,7 @@ static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
 {
 	struct fb_info *info = registered_fb[con2fb_map[fg_console]];
+	struct fbcon_ops *ops = info->fbcon_par;
 	struct display *p = &fb_display[fg_console];
 	int offset, limit, scrollback_old;
 
@@ -2520,9 +2592,11 @@ static int fbcon_scrolldelta(struct vc_data *vc, int lines)
 		offset += limit;
 	else if (offset >= limit)
 		offset -= limit;
-	info->var.xoffset = 0;
-	info->var.yoffset = offset * vc->vc_font.height;
-	update_var(vc->vc_num, info);
+
+	ops->var.xoffset = 0;
+	ops->var.yoffset = offset * vc->vc_font.height;
+	ops->update_start(info);
+
 	if (!scrollback_current)
 		fbcon_cursor(vc, CM_DRAW);
 	return 0;
@@ -2570,22 +2644,25 @@ static void fbcon_modechanged(struct fb_info *info)
 	if (!ops || ops->currcon < 0)
 		return;
 	vc = vc_cons[ops->currcon].d;
-	if (vc->vc_mode != KD_TEXT || registered_fb[con2fb_map[ops->currcon]] != info)
+	if (vc->vc_mode != KD_TEXT ||
+	    registered_fb[con2fb_map[ops->currcon]] != info)
 		return;
 
 	p = &fb_display[vc->vc_num];
-
-	info->var.xoffset = info->var.yoffset = p->yscroll = 0;
+	set_blitting_type(vc, info, p);
 
 	if (CON_IS_VISIBLE(vc)) {
 		var_to_display(p, &info->var, info);
-		cols = info->var.xres / vc->vc_font.width;
-		rows = info->var.yres / vc->vc_font.height;
+		cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
+		rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
+		cols /= vc->vc_font.width;
+		rows /= vc->vc_font.height;
 		vc_resize(vc, cols, rows);
 		updatescrollmode(p, info, vc);
 		scrollback_max = 0;
 		scrollback_current = 0;
-		update_var(vc->vc_num, info);
+		ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
+		ops->update_start(info);
 		fbcon_set_palette(vc, color_table);
 		update_screen(vc);
 		if (softback_buf)
@@ -2610,18 +2687,20 @@ static void fbcon_set_all_vcs(struct fb_info *info)
 			continue;
 
 		p = &fb_display[vc->vc_num];
-
-		info->var.xoffset = info->var.yoffset = p->yscroll = 0;
+		set_blitting_type(vc, info, p);
 		var_to_display(p, &info->var, info);
-		cols = info->var.xres / vc->vc_font.width;
-		rows = info->var.yres / vc->vc_font.height;
+		cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
+		rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
+		cols /= vc->vc_font.width;
+		rows /= vc->vc_font.height;
 		vc_resize(vc, cols, rows);
 
 		if (CON_IS_VISIBLE(vc)) {
 			updatescrollmode(p, info, vc);
 			scrollback_max = 0;
 			scrollback_current = 0;
-			update_var(vc->vc_num, info);
+			ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
+			ops->update_start(info);
 			fbcon_set_palette(vc, color_table);
 			update_screen(vc);
 			if (softback_buf)
diff --git a/drivers/video/console/fbcon.h b/drivers/video/console/fbcon.h
index b68e0e2..846a5a4 100644
--- a/drivers/video/console/fbcon.h
+++ b/drivers/video/console/fbcon.h
@@ -27,15 +27,15 @@
     */
 
 struct display {
-    /* Filled in by the frame buffer device */
-    u_short inverse;                /* != 0 text black on white as default */
     /* Filled in by the low-level console driver */
     const u_char *fontdata;
     int userfont;                   /* != 0 if fontdata kmalloc()ed */
     u_short scrollmode;             /* Scroll Method */
+    u_short inverse;                /* != 0 text black on white as default */
     short yscroll;                  /* Hardware scrolling */
     int vrows;                      /* number of virtual rows */
     int cursor_shape;
+    int con_rotate;
     u32 xres_virtual;
     u32 yres_virtual;
     u32 height;
@@ -52,6 +52,8 @@ struct display {
     struct fb_videomode *mode;
 };
 
+extern struct display fb_display[];
+
 struct fbcon_ops {
 	void (*bmove)(struct vc_data *vc, struct fb_info *info, int sy,
 		      int sx, int dy, int dx, int height, int width);
@@ -63,8 +65,12 @@ struct fbcon_ops {
 	void (*clear_margins)(struct vc_data *vc, struct fb_info *info,
 			      int bottom_only);
 	void (*cursor)(struct vc_data *vc, struct fb_info *info,
-		       struct display *p, int mode, int softback_lines, int fg, int bg);
-
+		       struct display *p, int mode, int softback_lines,
+		       int fg, int bg);
+	int  (*update_start)(struct fb_info *info);
+	int  (*rotate_font)(struct fb_info *info, struct vc_data *vc,
+			    struct display *p);
+	struct fb_var_screeninfo var;  /* copy of the current fb_var_screeninfo */
 	struct timer_list cursor_timer; /* Cursor timer */
 	struct fb_cursor cursor_state;
         int    currcon;	                /* Current VC. */
@@ -73,7 +79,12 @@ struct fbcon_ops {
 	int    blank_state;
 	int    graphics;
 	int    flags;
+	int    rotate;
+	int    cur_rotate;
 	char  *cursor_data;
+	u8    *fontbuffer;
+	u8    *fontdata;
+	u32    fd_size;
 };
     /*
      *  Attribute Decoding
@@ -168,4 +179,43 @@ extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info,
 #endif
 extern void fbcon_set_bitops(struct fbcon_ops *ops);
 extern int  soft_cursor(struct fb_info *info, struct fb_cursor *cursor);
+
+#define FBCON_ATTRIBUTE_UNDERLINE 1
+#define FBCON_ATTRIBUTE_REVERSE   2
+#define FBCON_ATTRIBUTE_BOLD      4
+
+static inline int real_y(struct display *p, int ypos)
+{
+	int rows = p->vrows;
+
+	ypos += p->yscroll;
+	return ypos < rows ? ypos : ypos - rows;
+}
+
+
+static inline int get_attribute(struct fb_info *info, u16 c)
+{
+	int attribute = 0;
+
+	if (fb_get_color_depth(&info->var, &info->fix) == 1) {
+		if (attr_underline(c))
+			attribute |= FBCON_ATTRIBUTE_UNDERLINE;
+		if (attr_reverse(c))
+			attribute |= FBCON_ATTRIBUTE_REVERSE;
+		if (attr_bold(c))
+			attribute |= FBCON_ATTRIBUTE_BOLD;
+	}
+
+	return attribute;
+}
+
+#define FBCON_SWAP(i,r,v) ({ \
+        typeof(r) _r = (r);  \
+        typeof(v) _v = (v);  \
+        (void) (&_r == &_v); \
+        (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })
+
+#define fbcon_set_rotate(x) do {} while(0)
+
 #endif /* _VIDEO_FBCON_H */
+
diff --git a/drivers/video/console/tileblit.c b/drivers/video/console/tileblit.c
index 7f76e2c..cb25324 100644
--- a/drivers/video/console/tileblit.c
+++ b/drivers/video/console/tileblit.c
@@ -118,6 +118,18 @@ static void tile_cursor(struct vc_data *vc, struct fb_info *info,
 	info->tileops->fb_tilecursor(info, &cursor);
 }
 
+static int tile_update_start(struct fb_info *info)
+{
+	struct fbcon_ops *ops = info->fbcon_par;
+	int err;
+
+	err = fb_pan_display(info, &ops->var);
+	ops->var.xoffset = info->var.xoffset;
+	ops->var.yoffset = info->var.yoffset;
+	ops->var.vmode = info->var.vmode;
+	return err;
+}
+
 void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info,
 		       struct display *p, struct fbcon_ops *ops)
 {
@@ -128,6 +140,7 @@ void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info,
 	ops->putcs = tile_putcs;
 	ops->clear_margins = tile_clear_margins;
 	ops->cursor = tile_cursor;
+	ops->update_start = tile_update_start;
 
 	if (p) {
 		map.width = vc->vc_font.width;
diff --git a/include/linux/fb.h b/include/linux/fb.h
index e7ff98e..51791dc 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -201,6 +201,14 @@ struct fb_bitfield {
 #define FB_VMODE_SMOOTH_XPAN	512	/* smooth xpan possible (internally used) */
 #define FB_VMODE_CONUPDATE	512	/* don't update x/yoffset	*/
 
+/*
+ * Display rotation support
+ */
+#define FB_ROTATE_UR      0
+#define FB_ROTATE_CW      1
+#define FB_ROTATE_UD      2
+#define FB_ROTATE_CCW     3
+
 #define PICOS2KHZ(a) (1000000000UL/(a))
 #define KHZ2PICOS(a) (1000000000UL/(a))
 
@@ -489,9 +497,9 @@ struct fb_cursor_user {
 #define FB_EVENT_MODE_DELETE            0x04
 /*      A driver registered itself */
 #define FB_EVENT_FB_REGISTERED          0x05
-/*      get console to framebuffer mapping */
+/*      CONSOLE-SPECIFIC: get console to framebuffer mapping */
 #define FB_EVENT_GET_CONSOLE_MAP        0x06
-/*      set console to framebuffer mapping */
+/*      CONSOLE-SPECIFIC: set console to framebuffer mapping */
 #define FB_EVENT_SET_CONSOLE_MAP        0x07
 /*      A display blank is requested       */
 #define FB_EVENT_BLANK                  0x08