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1/*
2 *  linux/drivers/video/console/fbcon_ccw.c -- Software Rotation - 270 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 270 degrees
23 */
24
25static void ccw_update_attr(u8 *dst, u8 *src, int attribute,
26				  struct vc_data *vc)
27{
28	int i, j, offset = (vc->vc_font.height < 10) ? 1 : 2;
29	int width = (vc->vc_font.height + 7) >> 3;
30	int mod = vc->vc_font.height % 8;
31	u8 c, msk = ~(0xff << offset), msk1 = 0;
32
33	if (mod)
34		msk <<= (8 - mod);
35
36	if (offset > mod)
37		msk1 |= 0x01;
38
39	for (i = 0; i < vc->vc_font.width; i++) {
40		for (j = 0; j < width; j++) {
41			c = *src;
42
43			if (attribute & FBCON_ATTRIBUTE_UNDERLINE) {
44				if (j == width - 1)
45					c |= msk;
46
47				if (msk1 && j == width - 2)
48					c |= msk1;
49			}
50
51			if (attribute & FBCON_ATTRIBUTE_BOLD && i)
52				*(dst - width) |= c;
53
54			if (attribute & FBCON_ATTRIBUTE_REVERSE)
55				c = ~c;
56			src++;
57			*dst++ = c;
58		}
59	}
60}
61
62
63static void ccw_bmove(struct vc_data *vc, struct fb_info *info, int sy,
64		     int sx, int dy, int dx, int height, int width)
65{
66	struct fbcon_ops *ops = info->fbcon_par;
67	struct fb_copyarea area;
68	u32 vyres = GETVYRES(ops->p->scrollmode, info);
69
70	area.sx = sy * vc->vc_font.height;
71	area.sy = vyres - ((sx + width) * vc->vc_font.width);
72	area.dx = dy * vc->vc_font.height;
73	area.dy = vyres - ((dx + width) * vc->vc_font.width);
74	area.width = height * vc->vc_font.height;
75	area.height  = width * vc->vc_font.width;
76
77	info->fbops->fb_copyarea(info, &area);
78}
79
80static void ccw_clear(struct vc_data *vc, struct fb_info *info, int sy,
81		     int sx, int height, int width)
82{
83	struct fbcon_ops *ops = info->fbcon_par;
84	struct fb_fillrect region;
85	int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
86	u32 vyres = GETVYRES(ops->p->scrollmode, info);
87
88	region.color = attr_bgcol_ec(bgshift,vc,info);
89	region.dx = sy * vc->vc_font.height;
90	region.dy = vyres - ((sx + width) * vc->vc_font.width);
91	region.height = width * vc->vc_font.width;
92	region.width = height * vc->vc_font.height;
93	region.rop = ROP_COPY;
94
95	info->fbops->fb_fillrect(info, &region);
96}
97
98static inline void ccw_putcs_aligned(struct vc_data *vc, struct fb_info *info,
99				    const u16 *s, u32 attr, u32 cnt,
100				    u32 d_pitch, u32 s_pitch, u32 cellsize,
101				    struct fb_image *image, u8 *buf, u8 *dst)
102{
103	struct fbcon_ops *ops = info->fbcon_par;
104	u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
105	u32 idx = (vc->vc_font.height + 7) >> 3;
106	u8 *src;
107
108	while (cnt--) {
109		src = ops->fontbuffer + (scr_readw(s--) & charmask)*cellsize;
110
111		if (attr) {
112			ccw_update_attr(buf, src, attr, vc);
113			src = buf;
114		}
115
116		if (likely(idx == 1))
117			__fb_pad_aligned_buffer(dst, d_pitch, src, idx,
118						vc->vc_font.width);
119		else
120			fb_pad_aligned_buffer(dst, d_pitch, src, idx,
121					      vc->vc_font.width);
122
123		dst += d_pitch * vc->vc_font.width;
124	}
125
126	info->fbops->fb_imageblit(info, image);
127}
128
129static void ccw_putcs(struct vc_data *vc, struct fb_info *info,
130		      const unsigned short *s, int count, int yy, int xx,
131		      int fg, int bg)
132{
133	struct fb_image image;
134	struct fbcon_ops *ops = info->fbcon_par;
135	u32 width = (vc->vc_font.height + 7)/8;
136	u32 cellsize = width * vc->vc_font.width;
137	u32 maxcnt = info->pixmap.size/cellsize;
138	u32 scan_align = info->pixmap.scan_align - 1;
139	u32 buf_align = info->pixmap.buf_align - 1;
140	u32 cnt, pitch, size;
141	u32 attribute = get_attribute(info, scr_readw(s));
142	u8 *dst, *buf = NULL;
143	u32 vyres = GETVYRES(ops->p->scrollmode, info);
144
145	if (!ops->fontbuffer)
146		return;
147
148	image.fg_color = fg;
149	image.bg_color = bg;
150	image.dx = yy * vc->vc_font.height;
151	image.dy = vyres - ((xx + count) * vc->vc_font.width);
152	image.width = vc->vc_font.height;
153	image.depth = 1;
154
155	if (attribute) {
156		buf = kmalloc(cellsize, GFP_KERNEL);
157		if (!buf)
158			return;
159	}
160
161	s += count - 1;
162
163	while (count) {
164		if (count > maxcnt)
165			cnt = maxcnt;
166		else
167			cnt = count;
168
169		image.height = vc->vc_font.width * cnt;
170		pitch = ((image.width + 7) >> 3) + scan_align;
171		pitch &= ~scan_align;
172		size = pitch * image.height + buf_align;
173		size &= ~buf_align;
174		dst = fb_get_buffer_offset(info, &info->pixmap, size);
175		image.data = dst;
176		ccw_putcs_aligned(vc, info, s, attribute, cnt, pitch,
177				 width, cellsize, &image, buf, dst);
178		image.dy += image.height;
179		count -= cnt;
180		s -= cnt;
181	}
182
183	/* buf is always NULL except when in monochrome mode, so in this case
184	   it's a gain to check buf against NULL even though kfree() handles
185	   NULL pointers just fine */
186	if (unlikely(buf))
187		kfree(buf);
188
189}
190
191static void ccw_clear_margins(struct vc_data *vc, struct fb_info *info,
192			     int bottom_only)
193{
194	unsigned int cw = vc->vc_font.width;
195	unsigned int ch = vc->vc_font.height;
196	unsigned int rw = info->var.yres - (vc->vc_cols*cw);
197	unsigned int bh = info->var.xres - (vc->vc_rows*ch);
198	unsigned int bs = vc->vc_rows*ch;
199	struct fb_fillrect region;
200
201	region.color = 0;
202	region.rop = ROP_COPY;
203
204	if (rw && !bottom_only) {
205		region.dx = 0;
206		region.dy = info->var.yoffset;
207		region.height = rw;
208		region.width = info->var.xres_virtual;
209		info->fbops->fb_fillrect(info, &region);
210	}
211
212	if (bh) {
213		region.dx = info->var.xoffset + bs;
214		region.dy = 0;
215                region.height = info->var.yres_virtual;
216                region.width = bh;
217		info->fbops->fb_fillrect(info, &region);
218	}
219}
220
221static void ccw_cursor(struct vc_data *vc, struct fb_info *info, int mode,
222		       int softback_lines, int fg, int bg)
223{
224	struct fb_cursor cursor;
225	struct fbcon_ops *ops = info->fbcon_par;
226	unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
227	int w = (vc->vc_font.height + 7) >> 3, c;
228	int y = real_y(ops->p, vc->vc_y);
229	int attribute, use_sw = (vc->vc_cursor_type & 0x10);
230	int err = 1, dx, dy;
231	char *src;
232	u32 vyres = GETVYRES(ops->p->scrollmode, info);
233
234	if (!ops->fontbuffer)
235		return;
236
237	cursor.set = 0;
238
239	if (softback_lines) {
240		if (y + softback_lines >= vc->vc_rows) {
241			mode = CM_ERASE;
242			ops->cursor_flash = 0;
243			return;
244		} else
245			y += softback_lines;
246	}
247
248 	c = scr_readw((u16 *) vc->vc_pos);
249	attribute = get_attribute(info, c);
250	src = ops->fontbuffer + ((c & charmask) * (w * vc->vc_font.width));
251
252	if (ops->cursor_state.image.data != src ||
253	    ops->cursor_reset) {
254	    ops->cursor_state.image.data = src;
255	    cursor.set |= FB_CUR_SETIMAGE;
256	}
257
258	if (attribute) {
259		u8 *dst;
260
261		dst = kmalloc(w * vc->vc_font.width, GFP_ATOMIC);
262		if (!dst)
263			return;
264		kfree(ops->cursor_data);
265		ops->cursor_data = dst;
266		ccw_update_attr(dst, src, attribute, vc);
267		src = dst;
268	}
269
270	if (ops->cursor_state.image.fg_color != fg ||
271	    ops->cursor_state.image.bg_color != bg ||
272	    ops->cursor_reset) {
273		ops->cursor_state.image.fg_color = fg;
274		ops->cursor_state.image.bg_color = bg;
275		cursor.set |= FB_CUR_SETCMAP;
276	}
277
278	if (ops->cursor_state.image.height != vc->vc_font.width ||
279	    ops->cursor_state.image.width != vc->vc_font.height ||
280	    ops->cursor_reset) {
281		ops->cursor_state.image.height = vc->vc_font.width;
282		ops->cursor_state.image.width = vc->vc_font.height;
283		cursor.set |= FB_CUR_SETSIZE;
284	}
285
286	dx = y * vc->vc_font.height;
287	dy = vyres - ((vc->vc_x + 1) * vc->vc_font.width);
288
289	if (ops->cursor_state.image.dx != dx ||
290	    ops->cursor_state.image.dy != dy ||
291	    ops->cursor_reset) {
292		ops->cursor_state.image.dx = dx;
293		ops->cursor_state.image.dy = dy;
294		cursor.set |= FB_CUR_SETPOS;
295	}
296
297	if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
298	    ops->cursor_reset) {
299		ops->cursor_state.hot.x = cursor.hot.y = 0;
300		cursor.set |= FB_CUR_SETHOT;
301	}
302
303	if (cursor.set & FB_CUR_SETSIZE ||
304	    vc->vc_cursor_type != ops->p->cursor_shape ||
305	    ops->cursor_state.mask == NULL ||
306	    ops->cursor_reset) {
307		char *tmp, *mask = kmalloc(w*vc->vc_font.width, GFP_ATOMIC);
308		int cur_height, size, i = 0;
309		int width = (vc->vc_font.width + 7)/8;
310
311		if (!mask)
312			return;
313
314		tmp = kmalloc(width * vc->vc_font.height, GFP_ATOMIC);
315
316		if (!tmp) {
317			kfree(mask);
318			return;
319		}
320
321		kfree(ops->cursor_state.mask);
322		ops->cursor_state.mask = mask;
323
324		ops->p->cursor_shape = vc->vc_cursor_type;
325		cursor.set |= FB_CUR_SETSHAPE;
326
327		switch (ops->p->cursor_shape & CUR_HWMASK) {
328		case CUR_NONE:
329			cur_height = 0;
330			break;
331		case CUR_UNDERLINE:
332			cur_height = (vc->vc_font.height < 10) ? 1 : 2;
333			break;
334		case CUR_LOWER_THIRD:
335			cur_height = vc->vc_font.height/3;
336			break;
337		case CUR_LOWER_HALF:
338			cur_height = vc->vc_font.height >> 1;
339			break;
340		case CUR_TWO_THIRDS:
341			cur_height = (vc->vc_font.height << 1)/3;
342			break;
343		case CUR_BLOCK:
344		default:
345			cur_height = vc->vc_font.height;
346			break;
347		}
348
349		size = (vc->vc_font.height - cur_height) * width;
350		while (size--)
351			tmp[i++] = 0;
352		size = cur_height * width;
353		while (size--)
354			tmp[i++] = 0xff;
355		memset(mask, 0, w * vc->vc_font.width);
356		rotate_ccw(tmp, mask, vc->vc_font.width, vc->vc_font.height);
357		kfree(tmp);
358	}
359
360	switch (mode) {
361	case CM_ERASE:
362		ops->cursor_state.enable = 0;
363		break;
364	case CM_DRAW:
365	case CM_MOVE:
366	default:
367		ops->cursor_state.enable = (use_sw) ? 0 : 1;
368		break;
369	}
370
371	cursor.image.data = src;
372	cursor.image.fg_color = ops->cursor_state.image.fg_color;
373	cursor.image.bg_color = ops->cursor_state.image.bg_color;
374	cursor.image.dx = ops->cursor_state.image.dx;
375	cursor.image.dy = ops->cursor_state.image.dy;
376	cursor.image.height = ops->cursor_state.image.height;
377	cursor.image.width = ops->cursor_state.image.width;
378	cursor.hot.x = ops->cursor_state.hot.x;
379	cursor.hot.y = ops->cursor_state.hot.y;
380	cursor.mask = ops->cursor_state.mask;
381	cursor.enable = ops->cursor_state.enable;
382	cursor.image.depth = 1;
383	cursor.rop = ROP_XOR;
384
385	if (info->fbops->fb_cursor)
386		err = info->fbops->fb_cursor(info, &cursor);
387
388	if (err)
389		soft_cursor(info, &cursor);
390
391	ops->cursor_reset = 0;
392}
393
394static int ccw_update_start(struct fb_info *info)
395{
396	struct fbcon_ops *ops = info->fbcon_par;
397	u32 yoffset;
398	u32 vyres = GETVYRES(ops->p->scrollmode, info);
399	int err;
400
401	yoffset = (vyres - info->var.yres) - ops->var.xoffset;
402	ops->var.xoffset = ops->var.yoffset;
403	ops->var.yoffset = yoffset;
404	err = fb_pan_display(info, &ops->var);
405	ops->var.xoffset = info->var.xoffset;
406	ops->var.yoffset = info->var.yoffset;
407	ops->var.vmode = info->var.vmode;
408	return err;
409}
410
411void fbcon_rotate_ccw(struct fbcon_ops *ops)
412{
413	ops->bmove = ccw_bmove;
414	ops->clear = ccw_clear;
415	ops->putcs = ccw_putcs;
416	ops->clear_margins = ccw_clear_margins;
417	ops->cursor = ccw_cursor;
418	ops->update_start = ccw_update_start;
419}
420EXPORT_SYMBOL(fbcon_rotate_ccw);
421
422MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
423MODULE_DESCRIPTION("Console Rotation (270 degrees) Support");
424MODULE_LICENSE("GPL");
425