1#ifndef _FB_DRAW_H
2#define _FB_DRAW_H
3
4#include <asm/types.h>
5#include <linux/fb.h>
6#include <linux/bug.h>
7
8    /*
9     *  Compose two values, using a bitmask as decision value
10     *  This is equivalent to (a & mask) | (b & ~mask)
11     */
12
13static inline unsigned long
14comp(unsigned long a, unsigned long b, unsigned long mask)
15{
16    return ((a ^ b) & mask) ^ b;
17}
18
19    /*
20     *  Create a pattern with the given pixel's color
21     */
22
23#if BITS_PER_LONG == 64
24static inline unsigned long
25pixel_to_pat( u32 bpp, u32 pixel)
26{
27	switch (bpp) {
28	case 1:
29		return 0xfffffffffffffffful*pixel;
30	case 2:
31		return 0x5555555555555555ul*pixel;
32	case 4:
33		return 0x1111111111111111ul*pixel;
34	case 8:
35		return 0x0101010101010101ul*pixel;
36	case 12:
37		return 0x1001001001001001ul*pixel;
38	case 16:
39		return 0x0001000100010001ul*pixel;
40	case 24:
41		return 0x0001000001000001ul*pixel;
42	case 32:
43		return 0x0000000100000001ul*pixel;
44	default:
45		WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
46		return 0;
47    }
48}
49#else
50static inline unsigned long
51pixel_to_pat( u32 bpp, u32 pixel)
52{
53	switch (bpp) {
54	case 1:
55		return 0xfffffffful*pixel;
56	case 2:
57		return 0x55555555ul*pixel;
58	case 4:
59		return 0x11111111ul*pixel;
60	case 8:
61		return 0x01010101ul*pixel;
62	case 12:
63		return 0x01001001ul*pixel;
64	case 16:
65		return 0x00010001ul*pixel;
66	case 24:
67		return 0x01000001ul*pixel;
68	case 32:
69		return 0x00000001ul*pixel;
70	default:
71		WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
72		return 0;
73    }
74}
75#endif
76
77#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
78#if BITS_PER_LONG == 64
79#define REV_PIXELS_MASK1 0x5555555555555555ul
80#define REV_PIXELS_MASK2 0x3333333333333333ul
81#define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
82#else
83#define REV_PIXELS_MASK1 0x55555555ul
84#define REV_PIXELS_MASK2 0x33333333ul
85#define REV_PIXELS_MASK4 0x0f0f0f0ful
86#endif
87
88static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
89						  u32 bswapmask)
90{
91	if (bswapmask & 1)
92		val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
93	if (bswapmask & 2)
94		val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
95	if (bswapmask & 3)
96		val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
97	return val;
98}
99
100static inline u32 fb_shifted_pixels_mask_u32(struct fb_info *p, u32 index,
101					     u32 bswapmask)
102{
103	u32 mask;
104
105	if (!bswapmask) {
106		mask = FB_SHIFT_HIGH(p, ~(u32)0, index);
107	} else {
108		mask = 0xff << FB_LEFT_POS(p, 8);
109		mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
110		mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
111#if defined(__i386__) || defined(__x86_64__)
112		/* Shift argument is limited to 0 - 31 on x86 based CPU's */
113		if(index + bswapmask < 32)
114#endif
115			mask |= FB_SHIFT_HIGH(p, ~(u32)0,
116					(index + bswapmask) & ~(bswapmask));
117	}
118	return mask;
119}
120
121static inline unsigned long fb_shifted_pixels_mask_long(struct fb_info *p,
122							u32 index,
123							u32 bswapmask)
124{
125	unsigned long mask;
126
127	if (!bswapmask) {
128		mask = FB_SHIFT_HIGH(p, ~0UL, index);
129	} else {
130		mask = 0xff << FB_LEFT_POS(p, 8);
131		mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
132		mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
133#if defined(__i386__) || defined(__x86_64__)
134		/* Shift argument is limited to 0 - 31 on x86 based CPU's */
135		if(index + bswapmask < BITS_PER_LONG)
136#endif
137			mask |= FB_SHIFT_HIGH(p, ~0UL,
138					(index + bswapmask) & ~(bswapmask));
139	}
140	return mask;
141}
142
143
144static inline u32 fb_compute_bswapmask(struct fb_info *info)
145{
146	u32 bswapmask = 0;
147	unsigned bpp = info->var.bits_per_pixel;
148
149	if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
150		/*
151		 * Reversed order of pixel layout in bytes
152		 * works only for 1, 2 and 4 bpp
153		 */
154		bswapmask = 7 - bpp + 1;
155	}
156	return bswapmask;
157}
158
159#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
160
161static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
162						  u32 bswapmask)
163{
164	return val;
165}
166
167#define fb_shifted_pixels_mask_u32(p, i, b) FB_SHIFT_HIGH((p), ~(u32)0, (i))
168#define fb_shifted_pixels_mask_long(p, i, b) FB_SHIFT_HIGH((p), ~0UL, (i))
169#define fb_compute_bswapmask(...) 0
170
171#endif  /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
172
173#define cpu_to_le_long _cpu_to_le_long(BITS_PER_LONG)
174#define _cpu_to_le_long(x) __cpu_to_le_long(x)
175#define __cpu_to_le_long(x) cpu_to_le##x
176
177#define le_long_to_cpu _le_long_to_cpu(BITS_PER_LONG)
178#define _le_long_to_cpu(x) __le_long_to_cpu(x)
179#define __le_long_to_cpu(x) le##x##_to_cpu
180
181static inline unsigned long rolx(unsigned long word, unsigned int shift, unsigned int x)
182{
183	return (word << shift) | (word >> (x - shift));
184}
185
186#endif /* FB_DRAW_H */
187