ssb: Add support for block-I/O
[linux-2.6] / drivers / video / fb_draw.h
1 #ifndef _FB_DRAW_H
2 #define _FB_DRAW_H
3
4 #include <asm/types.h>
5 #include <linux/fb.h>
6
7     /*
8      *  Compose two values, using a bitmask as decision value
9      *  This is equivalent to (a & mask) | (b & ~mask)
10      */
11
12 static inline unsigned long
13 comp(unsigned long a, unsigned long b, unsigned long mask)
14 {
15     return ((a ^ b) & mask) ^ b;
16 }
17
18     /*
19      *  Create a pattern with the given pixel's color
20      */
21
22 #if BITS_PER_LONG == 64
23 static inline unsigned long
24 pixel_to_pat( u32 bpp, u32 pixel)
25 {
26         switch (bpp) {
27         case 1:
28                 return 0xfffffffffffffffful*pixel;
29         case 2:
30                 return 0x5555555555555555ul*pixel;
31         case 4:
32                 return 0x1111111111111111ul*pixel;
33         case 8:
34                 return 0x0101010101010101ul*pixel;
35         case 12:
36                 return 0x0001001001001001ul*pixel;
37         case 16:
38                 return 0x0001000100010001ul*pixel;
39         case 24:
40                 return 0x0000000001000001ul*pixel;
41         case 32:
42                 return 0x0000000100000001ul*pixel;
43         default:
44                 panic("pixel_to_pat(): unsupported pixelformat\n");
45     }
46 }
47 #else
48 static inline unsigned long
49 pixel_to_pat( u32 bpp, u32 pixel)
50 {
51         switch (bpp) {
52         case 1:
53                 return 0xfffffffful*pixel;
54         case 2:
55                 return 0x55555555ul*pixel;
56         case 4:
57                 return 0x11111111ul*pixel;
58         case 8:
59                 return 0x01010101ul*pixel;
60         case 12:
61                 return 0x00001001ul*pixel;
62         case 16:
63                 return 0x00010001ul*pixel;
64         case 24:
65                 return 0x00000001ul*pixel;
66         case 32:
67                 return 0x00000001ul*pixel;
68         default:
69                 panic("pixel_to_pat(): unsupported pixelformat\n");
70     }
71 }
72 #endif
73
74 #ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
75 #if BITS_PER_LONG == 64
76 #define REV_PIXELS_MASK1 0x5555555555555555ul
77 #define REV_PIXELS_MASK2 0x3333333333333333ul
78 #define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
79 #else
80 #define REV_PIXELS_MASK1 0x55555555ul
81 #define REV_PIXELS_MASK2 0x33333333ul
82 #define REV_PIXELS_MASK4 0x0f0f0f0ful
83 #endif
84
85 static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
86                                                   u32 bswapmask)
87 {
88         if (bswapmask & 1)
89                 val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
90         if (bswapmask & 2)
91                 val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
92         if (bswapmask & 3)
93                 val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
94         return val;
95 }
96
97 static inline u32 fb_shifted_pixels_mask_u32(u32 index, u32 bswapmask)
98 {
99         u32 mask;
100
101         if (!bswapmask) {
102                 mask = FB_SHIFT_HIGH(~(u32)0, index);
103         } else {
104                 mask = 0xff << FB_LEFT_POS(8);
105                 mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
106                 mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
107 #if defined(__i386__) || defined(__x86_64__)
108                 /* Shift argument is limited to 0 - 31 on x86 based CPU's */
109                 if(index + bswapmask < 32)
110 #endif
111                         mask |= FB_SHIFT_HIGH(~(u32)0,
112                                         (index + bswapmask) & ~(bswapmask));
113         }
114         return mask;
115 }
116
117 static inline unsigned long fb_shifted_pixels_mask_long(u32 index, u32 bswapmask)
118 {
119         unsigned long mask;
120
121         if (!bswapmask) {
122                 mask = FB_SHIFT_HIGH(~0UL, index);
123         } else {
124                 mask = 0xff << FB_LEFT_POS(8);
125                 mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
126                 mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
127 #if defined(__i386__) || defined(__x86_64__)
128                 /* Shift argument is limited to 0 - 31 on x86 based CPU's */
129                 if(index + bswapmask < BITS_PER_LONG)
130 #endif
131                         mask |= FB_SHIFT_HIGH(~0UL,
132                                         (index + bswapmask) & ~(bswapmask));
133         }
134         return mask;
135 }
136
137
138 static inline u32 fb_compute_bswapmask(struct fb_info *info)
139 {
140         u32 bswapmask = 0;
141         unsigned bpp = info->var.bits_per_pixel;
142
143         if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
144                 /*
145                  * Reversed order of pixel layout in bytes
146                  * works only for 1, 2 and 4 bpp
147                  */
148                 bswapmask = 7 - bpp + 1;
149         }
150         return bswapmask;
151 }
152
153 #else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
154
155 static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
156                                                   u32 bswapmask)
157 {
158         return val;
159 }
160
161 #define fb_shifted_pixels_mask_u32(i, b) FB_SHIFT_HIGH(~(u32)0, (i))
162 #define fb_shifted_pixels_mask_long(i, b) FB_SHIFT_HIGH(~0UL, (i))
163 #define fb_compute_bswapmask(...) 0
164
165 #endif  /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
166
167 #endif /* FB_DRAW_H */