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1/*
2 *  linux/drivers/video/console/fbcon_ud.c -- Software Rotation - 180 degrees
3 *
4 *      Copyright (C) 2005 Antonino Daplas <adaplas @pol.net>
5 *
6 *  This file is subject to the terms and conditions of the GNU General Public
7 *  License.  See the file COPYING in the main directory of this archive for
8 *  more details.
9 */
10
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/string.h>
14#include <linux/fb.h>
15#include <linux/vt_kern.h>
16#include <linux/console.h>
17#include <asm/types.h>
18#include "fbcon.h"
19#include "fbcon_rotate.h"
20
21/*
22 * Rotation 180 degrees
23 */
24
25static void ud_update_attr(u8 *dst, u8 *src, int attribute,
26				  struct vc_data *vc)
27{
28	int i, offset = (vc->vc_font.height < 10) ? 1 : 2;
29	int width = (vc->vc_font.width + 7) >> 3;
30	unsigned int cellsize = vc->vc_font.height * width;
31	u8 c;
32
33	offset = offset * width;
34
35	for (i = 0; i < cellsize; i++) {
36		c = src[i];
37		if (attribute & FBCON_ATTRIBUTE_UNDERLINE && i < offset)
38			c = 0xff;
39		if (attribute & FBCON_ATTRIBUTE_BOLD)
40			c |= c << 1;
41		if (attribute & FBCON_ATTRIBUTE_REVERSE)
42			c = ~c;
43		dst[i] = c;
44	}
45}
46
47
48static void ud_bmove(struct vc_data *vc, struct fb_info *info, int sy,
49		     int sx, int dy, int dx, int height, int width)
50{
51	struct fbcon_ops *ops = info->fbcon_par;
52	struct fb_copyarea area;
53	u32 vyres = GETVYRES(ops->p->scrollmode, info);
54	u32 vxres = GETVXRES(ops->p->scrollmode, info);
55
56	area.sy = vyres - ((sy + height) * vc->vc_font.height);
57	area.sx = vxres - ((sx + width) * vc->vc_font.width);
58	area.dy = vyres - ((dy + height) * vc->vc_font.height);
59	area.dx = vxres - ((dx + width) * vc->vc_font.width);
60	area.height = height * vc->vc_font.height;
61	area.width  = width * vc->vc_font.width;
62
63	info->fbops->fb_copyarea(info, &area);
64}
65
66static void ud_clear(struct vc_data *vc, struct fb_info *info, int sy,
67		     int sx, int height, int width)
68{
69	struct fbcon_ops *ops = info->fbcon_par;
70	struct fb_fillrect region;
71	int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
72	u32 vyres = GETVYRES(ops->p->scrollmode, info);
73	u32 vxres = GETVXRES(ops->p->scrollmode, info);
74
75	region.color = attr_bgcol_ec(bgshift,vc,info);
76	region.dy = vyres - ((sy + height) * vc->vc_font.height);
77	region.dx = vxres - ((sx + width) *  vc->vc_font.width);
78	region.width = width * vc->vc_font.width;
79	region.height = height * vc->vc_font.height;
80	region.rop = ROP_COPY;
81
82	info->fbops->fb_fillrect(info, &region);
83}
84
85static inline void ud_putcs_aligned(struct vc_data *vc, struct fb_info *info,
86				    const u16 *s, u32 attr, u32 cnt,
87				    u32 d_pitch, u32 s_pitch, u32 cellsize,
88				    struct fb_image *image, u8 *buf, u8 *dst)
89{
90	struct fbcon_ops *ops = info->fbcon_par;
91	u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
92	u32 idx = vc->vc_font.width >> 3;
93	u8 *src;
94
95	while (cnt--) {
96		src = ops->fontbuffer + (scr_readw(s--) & charmask)*cellsize;
97
98		if (attr) {
99			ud_update_attr(buf, src, attr, vc);
100			src = buf;
101		}
102
103		if (likely(idx == 1))
104			__fb_pad_aligned_buffer(dst, d_pitch, src, idx,
105						image->height);
106		else
107			fb_pad_aligned_buffer(dst, d_pitch, src, idx,
108					      image->height);
109
110		dst += s_pitch;
111	}
112
113	info->fbops->fb_imageblit(info, image);
114}
115
116static inline void ud_putcs_unaligned(struct vc_data *vc,
117				      struct fb_info *info, const u16 *s,
118				      u32 attr, u32 cnt, u32 d_pitch,
119				      u32 s_pitch, u32 cellsize,
120				      struct fb_image *image, u8 *buf,
121				      u8 *dst)
122{
123	struct fbcon_ops *ops = info->fbcon_par;
124	u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
125	u32 shift_low = 0, mod = vc->vc_font.width % 8;
126	u32 shift_high = 8;
127	u32 idx = vc->vc_font.width >> 3;
128	u8 *src;
129
130	while (cnt--) {
131		src = ops->fontbuffer + (scr_readw(s--) & charmask)*cellsize;
132
133		if (attr) {
134			ud_update_attr(buf, src, attr, vc);
135			src = buf;
136		}
137
138		fb_pad_unaligned_buffer(dst, d_pitch, src, idx,
139					image->height, shift_high,
140					shift_low, mod);
141		shift_low += mod;
142		dst += (shift_low >= 8) ? s_pitch : s_pitch - 1;
143		shift_low &= 7;
144		shift_high = 8 - shift_low;
145	}
146
147	info->fbops->fb_imageblit(info, image);
148
149}
150
151static void ud_putcs(struct vc_data *vc, struct fb_info *info,
152		      const unsigned short *s, int count, int yy, int xx,
153		      int fg, int bg)
154{
155	struct fb_image image;
156	struct fbcon_ops *ops = info->fbcon_par;
157	u32 width = (vc->vc_font.width + 7)/8;
158	u32 cellsize = width * vc->vc_font.height;
159	u32 maxcnt = info->pixmap.size/cellsize;
160	u32 scan_align = info->pixmap.scan_align - 1;
161	u32 buf_align = info->pixmap.buf_align - 1;
162	u32 mod = vc->vc_font.width % 8, cnt, pitch, size;
163	u32 attribute = get_attribute(info, scr_readw(s));
164	u8 *dst, *buf = NULL;
165	u32 vyres = GETVYRES(ops->p->scrollmode, info);
166	u32 vxres = GETVXRES(ops->p->scrollmode, info);
167
168	if (!ops->fontbuffer)
169		return;
170
171	image.fg_color = fg;
172	image.bg_color = bg;
173	image.dy = vyres - ((yy * vc->vc_font.height) + vc->vc_font.height);
174	image.dx = vxres - ((xx + count) * vc->vc_font.width);
175	image.height = vc->vc_font.height;
176	image.depth = 1;
177
178	if (attribute) {
179		buf = kmalloc(cellsize, GFP_KERNEL);
180		if (!buf)
181			return;
182	}
183
184	s += count - 1;
185
186	while (count) {
187		if (count > maxcnt)
188			cnt = maxcnt;
189		else
190			cnt = count;
191
192		image.width = vc->vc_font.width * cnt;
193		pitch = ((image.width + 7) >> 3) + scan_align;
194		pitch &= ~scan_align;
195		size = pitch * image.height + buf_align;
196		size &= ~buf_align;
197		dst = fb_get_buffer_offset(info, &info->pixmap, size);
198		image.data = dst;
199
200		if (!mod)
201			ud_putcs_aligned(vc, info, s, attribute, cnt, pitch,
202					 width, cellsize, &image, buf, dst);
203		else
204			ud_putcs_unaligned(vc, info, s, attribute, cnt, pitch,
205					   width, cellsize, &image,
206					   buf, dst);
207
208		image.dx += image.width;
209		count -= cnt;
210		s -= cnt;
211		xx += cnt;
212	}
213
214	/* buf is always NULL except when in monochrome mode, so in this case
215	   it's a gain to check buf against NULL even though kfree() handles
216	   NULL pointers just fine */
217	if (unlikely(buf))
218		kfree(buf);
219
220}
221
222static void ud_clear_margins(struct vc_data *vc, struct fb_info *info,
223			     int bottom_only)
224{
225	unsigned int cw = vc->vc_font.width;
226	unsigned int ch = vc->vc_font.height;
227	unsigned int rw = info->var.xres - (vc->vc_cols*cw);
228	unsigned int bh = info->var.yres - (vc->vc_rows*ch);
229	struct fb_fillrect region;
230
231	region.color = 0;
232	region.rop = ROP_COPY;
233
234	if (rw && !bottom_only) {
235		region.dy = 0;
236		region.dx = info->var.xoffset;
237		region.width  = rw;
238		region.height = info->var.yres_virtual;
239		info->fbops->fb_fillrect(info, &region);
240	}
241
242	if (bh) {
243		region.dy = info->var.yoffset;
244		region.dx = info->var.xoffset;
245                region.height  = bh;
246                region.width = info->var.xres;
247		info->fbops->fb_fillrect(info, &region);
248	}
249}
250
251static void ud_cursor(struct vc_data *vc, struct fb_info *info, int mode,
252		      int softback_lines, int fg, int bg)
253{
254	struct fb_cursor cursor;
255	struct fbcon_ops *ops = info->fbcon_par;
256	unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
257	int w = (vc->vc_font.width + 7) >> 3, c;
258	int y = real_y(ops->p, vc->vc_y);
259	int attribute, use_sw = (vc->vc_cursor_type & 0x10);
260	int err = 1, dx, dy;
261	char *src;
262	u32 vyres = GETVYRES(ops->p->scrollmode, info);
263	u32 vxres = GETVXRES(ops->p->scrollmode, info);
264
265	if (!ops->fontbuffer)
266		return;
267
268	cursor.set = 0;
269
270	if (softback_lines) {
271		if (y + softback_lines >= vc->vc_rows) {
272			mode = CM_ERASE;
273			ops->cursor_flash = 0;
274			return;
275		} else
276			y += softback_lines;
277	}
278
279 	c = scr_readw((u16 *) vc->vc_pos);
280	attribute = get_attribute(info, c);
281	src = ops->fontbuffer + ((c & charmask) * (w * vc->vc_font.height));
282
283	if (ops->cursor_state.image.data != src ||
284	    ops->cursor_reset) {
285	    ops->cursor_state.image.data = src;
286	    cursor.set |= FB_CUR_SETIMAGE;
287	}
288
289	if (attribute) {
290		u8 *dst;
291
292		dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);
293		if (!dst)
294			return;
295		kfree(ops->cursor_data);
296		ops->cursor_data = dst;
297		ud_update_attr(dst, src, attribute, vc);
298		src = dst;
299	}
300
301	if (ops->cursor_state.image.fg_color != fg ||
302	    ops->cursor_state.image.bg_color != bg ||
303	    ops->cursor_reset) {
304		ops->cursor_state.image.fg_color = fg;
305		ops->cursor_state.image.bg_color = bg;
306		cursor.set |= FB_CUR_SETCMAP;
307	}
308
309	if (ops->cursor_state.image.height != vc->vc_font.height ||
310	    ops->cursor_state.image.width != vc->vc_font.width ||
311	    ops->cursor_reset) {
312		ops->cursor_state.image.height = vc->vc_font.height;
313		ops->cursor_state.image.width = vc->vc_font.width;
314		cursor.set |= FB_CUR_SETSIZE;
315	}
316
317	dy = vyres - ((y * vc->vc_font.height) + vc->vc_font.height);
318	dx = vxres - ((vc->vc_x * vc->vc_font.width) + vc->vc_font.width);
319
320	if (ops->cursor_state.image.dx != dx ||
321	    ops->cursor_state.image.dy != dy ||
322	    ops->cursor_reset) {
323		ops->cursor_state.image.dx = dx;
324		ops->cursor_state.image.dy = dy;
325		cursor.set |= FB_CUR_SETPOS;
326	}
327
328	if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
329	    ops->cursor_reset) {
330		ops->cursor_state.hot.x = cursor.hot.y = 0;
331		cursor.set |= FB_CUR_SETHOT;
332	}
333
334	if (cursor.set & FB_CUR_SETSIZE ||
335	    vc->vc_cursor_type != ops->p->cursor_shape ||
336	    ops->cursor_state.mask == NULL ||
337	    ops->cursor_reset) {
338		char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);
339		int cur_height, size, i = 0;
340		u8 msk = 0xff;
341
342		if (!mask)
343			return;
344
345		kfree(ops->cursor_state.mask);
346		ops->cursor_state.mask = mask;
347
348		ops->p->cursor_shape = vc->vc_cursor_type;
349		cursor.set |= FB_CUR_SETSHAPE;
350
351		switch (ops->p->cursor_shape & CUR_HWMASK) {
352		case CUR_NONE:
353			cur_height = 0;
354			break;
355		case CUR_UNDERLINE:
356			cur_height = (vc->vc_font.height < 10) ? 1 : 2;
357			break;
358		case CUR_LOWER_THIRD:
359			cur_height = vc->vc_font.height/3;
360			break;
361		case CUR_LOWER_HALF:
362			cur_height = vc->vc_font.height >> 1;
363			break;
364		case CUR_TWO_THIRDS:
365			cur_height = (vc->vc_font.height << 1)/3;
366			break;
367		case CUR_BLOCK:
368		default:
369			cur_height = vc->vc_font.height;
370			break;
371		}
372
373		size = cur_height * w;
374
375		while (size--)
376			mask[i++] = msk;
377
378		size = (vc->vc_font.height - cur_height) * w;
379
380		while (size--)
381			mask[i++] = ~msk;
382	}
383
384	switch (mode) {
385	case CM_ERASE:
386		ops->cursor_state.enable = 0;
387		break;
388	case CM_DRAW:
389	case CM_MOVE:
390	default:
391		ops->cursor_state.enable = (use_sw) ? 0 : 1;
392		break;
393	}
394
395	cursor.image.data = src;
396	cursor.image.fg_color = ops->cursor_state.image.fg_color;
397	cursor.image.bg_color = ops->cursor_state.image.bg_color;
398	cursor.image.dx = ops->cursor_state.image.dx;
399	cursor.image.dy = ops->cursor_state.image.dy;
400	cursor.image.height = ops->cursor_state.image.height;
401	cursor.image.width = ops->cursor_state.image.width;
402	cursor.hot.x = ops->cursor_state.hot.x;
403	cursor.hot.y = ops->cursor_state.hot.y;
404	cursor.mask = ops->cursor_state.mask;
405	cursor.enable = ops->cursor_state.enable;
406	cursor.image.depth = 1;
407	cursor.rop = ROP_XOR;
408
409	if (info->fbops->fb_cursor)
410		err = info->fbops->fb_cursor(info, &cursor);
411
412	if (err)
413		soft_cursor(info, &cursor);
414
415	ops->cursor_reset = 0;
416}
417
418static int ud_update_start(struct fb_info *info)
419{
420	struct fbcon_ops *ops = info->fbcon_par;
421	int xoffset, yoffset;
422	u32 vyres = GETVYRES(ops->p->scrollmode, info);
423	u32 vxres = GETVXRES(ops->p->scrollmode, info);
424	int err;
425
426	xoffset = vxres - info->var.xres - ops->var.xoffset;
427	yoffset = vyres - info->var.yres - ops->var.yoffset;
428	if (yoffset < 0)
429		yoffset += vyres;
430	ops->var.xoffset = xoffset;
431	ops->var.yoffset = yoffset;
432	err = fb_pan_display(info, &ops->var);
433	ops->var.xoffset = info->var.xoffset;
434	ops->var.yoffset = info->var.yoffset;
435	ops->var.vmode = info->var.vmode;
436	return err;
437}
438
439void fbcon_rotate_ud(struct fbcon_ops *ops)
440{
441	ops->bmove = ud_bmove;
442	ops->clear = ud_clear;
443	ops->putcs = ud_putcs;
444	ops->clear_margins = ud_clear_margins;
445	ops->cursor = ud_cursor;
446	ops->update_start = ud_update_start;
447}
448EXPORT_SYMBOL(fbcon_rotate_ud);
449
450MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
451MODULE_DESCRIPTION("Console Rotation (180 degrees) Support");
452MODULE_LICENSE("GPL");
453