[ARM] Fix arch-realview/system.h to use __io_address()
[linux-2.6/linux-loongson.git] / drivers / video / cfbimgblt.c
bloba7770c4f17d08f980c9e8724dc9e1d07ddd27ac5
1 /*
2 * Generic BitBLT function for frame buffer with packed pixels of any depth.
4 * Copyright (C) June 1999 James Simmons
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.
10 * NOTES:
12 * This function copys a image from system memory to video memory. The
13 * image can be a bitmap where each 0 represents the background color and
14 * each 1 represents the foreground color. Great for font handling. It can
15 * also be a color image. This is determined by image_depth. The color image
16 * must be laid out exactly in the same format as the framebuffer. Yes I know
17 * their are cards with hardware that coverts images of various depths to the
18 * framebuffer depth. But not every card has this. All images must be rounded
19 * up to the nearest byte. For example a bitmap 12 bits wide must be two
20 * bytes width.
22 * Tony:
23 * Incorporate mask tables similar to fbcon-cfb*.c in 2.4 API. This speeds
24 * up the code significantly.
26 * Code for depths not multiples of BITS_PER_LONG is still kludgy, which is
27 * still processed a bit at a time.
29 * Also need to add code to deal with cards endians that are different than
30 * the native cpu endians. I also need to deal with MSB position in the word.
32 #include <linux/config.h>
33 #include <linux/module.h>
34 #include <linux/string.h>
35 #include <linux/fb.h>
36 #include <asm/types.h>
38 #define DEBUG
40 #ifdef DEBUG
41 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__FUNCTION__,## args)
42 #else
43 #define DPRINTK(fmt, args...)
44 #endif
46 static u32 cfb_tab8[] = {
47 #if defined(__BIG_ENDIAN)
48 0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
49 0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
50 0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
51 0xffff0000,0xffff00ff,0xffffff00,0xffffffff
52 #elif defined(__LITTLE_ENDIAN)
53 0x00000000,0xff000000,0x00ff0000,0xffff0000,
54 0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
55 0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
56 0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
57 #else
58 #error FIXME: No endianness??
59 #endif
62 static u32 cfb_tab16[] = {
63 #if defined(__BIG_ENDIAN)
64 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
65 #elif defined(__LITTLE_ENDIAN)
66 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
67 #else
68 #error FIXME: No endianness??
69 #endif
72 static u32 cfb_tab32[] = {
73 0x00000000, 0xffffffff
76 #define FB_WRITEL fb_writel
77 #define FB_READL fb_readl
79 #if defined (__BIG_ENDIAN)
80 #define LEFT_POS(bpp) (32 - bpp)
81 #define SHIFT_HIGH(val, bits) ((val) >> (bits))
82 #define SHIFT_LOW(val, bits) ((val) << (bits))
83 #define BIT_NR(b) (7 - (b))
84 #else
85 #define LEFT_POS(bpp) (0)
86 #define SHIFT_HIGH(val, bits) ((val) << (bits))
87 #define SHIFT_LOW(val, bits) ((val) >> (bits))
88 #define BIT_NR(b) (b)
89 #endif
91 static inline void color_imageblit(const struct fb_image *image,
92 struct fb_info *p, u8 __iomem *dst1,
93 u32 start_index,
94 u32 pitch_index)
96 /* Draw the penguin */
97 u32 __iomem *dst, *dst2;
98 u32 color = 0, val, shift;
99 int i, n, bpp = p->var.bits_per_pixel;
100 u32 null_bits = 32 - bpp;
101 u32 *palette = (u32 *) p->pseudo_palette;
102 const u8 *src = image->data;
104 dst2 = (u32 __iomem *) dst1;
105 for (i = image->height; i--; ) {
106 n = image->width;
107 dst = (u32 __iomem *) dst1;
108 shift = 0;
109 val = 0;
111 if (start_index) {
112 u32 start_mask = ~(SHIFT_HIGH(~(u32)0, start_index));
113 val = FB_READL(dst) & start_mask;
114 shift = start_index;
116 while (n--) {
117 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
118 p->fix.visual == FB_VISUAL_DIRECTCOLOR )
119 color = palette[*src];
120 else
121 color = *src;
122 color <<= LEFT_POS(bpp);
123 val |= SHIFT_HIGH(color, shift);
124 if (shift >= null_bits) {
125 FB_WRITEL(val, dst++);
127 val = (shift == null_bits) ? 0 :
128 SHIFT_LOW(color, 32 - shift);
130 shift += bpp;
131 shift &= (32 - 1);
132 src++;
134 if (shift) {
135 u32 end_mask = SHIFT_HIGH(~(u32)0, shift);
137 FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
139 dst1 += p->fix.line_length;
140 if (pitch_index) {
141 dst2 += p->fix.line_length;
142 dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
144 start_index += pitch_index;
145 start_index &= 32 - 1;
150 static inline void slow_imageblit(const struct fb_image *image, struct fb_info *p,
151 u8 __iomem *dst1, u32 fgcolor,
152 u32 bgcolor,
153 u32 start_index,
154 u32 pitch_index)
156 u32 shift, color = 0, bpp = p->var.bits_per_pixel;
157 u32 __iomem *dst, *dst2;
158 u32 val, pitch = p->fix.line_length;
159 u32 null_bits = 32 - bpp;
160 u32 spitch = (image->width+7)/8;
161 const u8 *src = image->data, *s;
162 u32 i, j, l;
164 dst2 = (u32 __iomem *) dst1;
166 for (i = image->height; i--; ) {
167 shift = val = 0;
168 l = 8;
169 j = image->width;
170 dst = (u32 __iomem *) dst1;
171 s = src;
173 /* write leading bits */
174 if (start_index) {
175 u32 start_mask = ~(SHIFT_HIGH(~(u32)0, start_index));
176 val = FB_READL(dst) & start_mask;
177 shift = start_index;
180 while (j--) {
181 l--;
182 color = (*s & 1 << (BIT_NR(l))) ? fgcolor : bgcolor;
183 color <<= LEFT_POS(bpp);
184 val |= SHIFT_HIGH(color, shift);
186 /* Did the bitshift spill bits to the next long? */
187 if (shift >= null_bits) {
188 FB_WRITEL(val, dst++);
189 val = (shift == null_bits) ? 0 :
190 SHIFT_LOW(color,32 - shift);
192 shift += bpp;
193 shift &= (32 - 1);
194 if (!l) { l = 8; s++; };
197 /* write trailing bits */
198 if (shift) {
199 u32 end_mask = SHIFT_HIGH(~(u32)0, shift);
201 FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
204 dst1 += pitch;
205 src += spitch;
206 if (pitch_index) {
207 dst2 += pitch;
208 dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
209 start_index += pitch_index;
210 start_index &= 32 - 1;
217 * fast_imageblit - optimized monochrome color expansion
219 * Only if: bits_per_pixel == 8, 16, or 32
220 * image->width is divisible by pixel/dword (ppw);
221 * fix->line_legth is divisible by 4;
222 * beginning and end of a scanline is dword aligned
224 static inline void fast_imageblit(const struct fb_image *image, struct fb_info *p,
225 u8 __iomem *dst1, u32 fgcolor,
226 u32 bgcolor)
228 u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
229 u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
230 u32 bit_mask, end_mask, eorx, shift;
231 const char *s = image->data, *src;
232 u32 __iomem *dst;
233 u32 *tab = NULL;
234 int i, j, k;
236 switch (bpp) {
237 case 8:
238 tab = cfb_tab8;
239 break;
240 case 16:
241 tab = cfb_tab16;
242 break;
243 case 32:
244 tab = cfb_tab32;
245 break;
248 for (i = ppw-1; i--; ) {
249 fgx <<= bpp;
250 bgx <<= bpp;
251 fgx |= fgcolor;
252 bgx |= bgcolor;
255 bit_mask = (1 << ppw) - 1;
256 eorx = fgx ^ bgx;
257 k = image->width/ppw;
259 for (i = image->height; i--; ) {
260 dst = (u32 __iomem *) dst1, shift = 8; src = s;
262 for (j = k; j--; ) {
263 shift -= ppw;
264 end_mask = tab[(*src >> shift) & bit_mask];
265 FB_WRITEL((end_mask & eorx)^bgx, dst++);
266 if (!shift) { shift = 8; src++; }
268 dst1 += p->fix.line_length;
269 s += spitch;
273 void cfb_imageblit(struct fb_info *p, const struct fb_image *image)
275 u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
276 u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
277 u32 width = image->width;
278 u32 dx = image->dx, dy = image->dy;
279 u8 __iomem *dst1;
281 if (p->state != FBINFO_STATE_RUNNING)
282 return;
284 bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
285 start_index = bitstart & (32 - 1);
286 pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
288 bitstart /= 8;
289 bitstart &= ~(bpl - 1);
290 dst1 = p->screen_base + bitstart;
292 if (p->fbops->fb_sync)
293 p->fbops->fb_sync(p);
295 if (image->depth == 1) {
296 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
297 p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
298 fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
299 bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
300 } else {
301 fgcolor = image->fg_color;
302 bgcolor = image->bg_color;
305 if (32 % bpp == 0 && !start_index && !pitch_index &&
306 ((width & (32/bpp-1)) == 0) &&
307 bpp >= 8 && bpp <= 32)
308 fast_imageblit(image, p, dst1, fgcolor, bgcolor);
309 else
310 slow_imageblit(image, p, dst1, fgcolor, bgcolor,
311 start_index, pitch_index);
312 } else
313 color_imageblit(image, p, dst1, start_index, pitch_index);
316 EXPORT_SYMBOL(cfb_imageblit);
318 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
319 MODULE_DESCRIPTION("Generic software accelerated imaging drawing");
320 MODULE_LICENSE("GPL");