1 /*
2 * ATI Mach64 CT/VT/GT/LT Cursor Support
3 */
4
5 #include <linux/slab.h>
6 #include <linux/fb.h>
7 #include <linux/init.h>
8 #include <linux/string.h>
9
10 #include <asm/io.h>
11 #include <asm/uaccess.h>
12
13 #ifdef __sparc__
14 #include <asm/pbm.h>
15 #include <asm/fbio.h>
16 #endif
17
18 #include <video/mach64.h>
19 #include "atyfb.h"
20
21 /*
22 * The hardware cursor definition requires 2 bits per pixel. The
23 * Cursor size reguardless of the visible cursor size is 64 pixels
24 * by 64 lines. The total memory required to define the cursor is
25 * 16 bytes / line for 64 lines or 1024 bytes of data. The data
26 * must be in a contigiuos format. The 2 bit cursor code values are
27 * as follows:
28 *
29 * 00 - pixel colour = CURSOR_CLR_0
30 * 01 - pixel colour = CURSOR_CLR_1
31 * 10 - pixel colour = transparent (current display pixel)
32 * 11 - pixel colour = 1's complement of current display pixel
33 *
34 * Cursor Offset 64 pixels Actual Displayed Area
35 * \_________________________/
36 * | | | |
37 * |<--------------->| | |
38 * | CURS_HORZ_OFFSET| | |
39 * | |_______| | 64 Lines
40 * | ^ | |
41 * | | | |
42 * | CURS_VERT_OFFSET| |
43 * | | | |
44 * |____________________|____| |
45 *
46 *
47 * The Screen position of the top left corner of the displayed
48 * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
49 * when the cursor hot spot is not the top left corner and the
50 * physical cursor position becomes negative. It will be be displayed
51 * if either the horizontal or vertical cursor position is negative
52 *
53 * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
54 * to a larger number and saturate CUR_HORZ_POSN to zero.
55 *
56 * if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
57 * CUR_OFFSET must be adjusted to a point to the appropraite line in the cursor
58 * definitation and CUR_VERT_POSN must be saturated to zero.
59 */
60
61 /*
62 * Hardware Cursor support.
63 */
64 static const u8 cursor_bits_lookup[16] = {
65 0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
66 0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
67 };
68
69 static const u8 cursor_mask_lookup[16] = {
70 0xaa, 0x2a, 0x8a, 0x0a, 0xa2, 0x22, 0x82, 0x02,
71 0xa8, 0x28, 0x88, 0x08, 0xa0, 0x20, 0x80, 0x00
72 };
73
74 int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
75 {
76 struct atyfb_par *par = (struct atyfb_par *) info->par;
77 u16 xoff, yoff;
78 int x, y, h;
79
80 #ifdef __sparc__
81 if (par->mmaped)
82 return -EPERM;
83 #endif
84 if (par->asleep)
85 return -EPERM;
86
87 /* Hide cursor */
88 wait_for_fifo(1, par);
89 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) & ~HWCURSOR_ENABLE, par);
90
91 /* set position */
92 if (cursor->set & FB_CUR_SETPOS) {
93 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
94 if (x < 0) {
95 xoff = -x;
96 x = 0;
97 } else {
98 xoff = 0;
99 }
100
101 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
102 if (y < 0) {
103 yoff = -y;
104 y = 0;
105 } else {
106 yoff = 0;
107 }
108
109 h = cursor->image.height;
110
111 /*
112 * In doublescan mode, the cursor location
113 * and heigh also needs to be doubled.
114 */
115 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
116 y<<=1;
117 h<<=1;
118 }
119 wait_for_fifo(4, par);
120 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
121 aty_st_le32(CUR_HORZ_VERT_OFF,
122 ((u32) (64 - h + yoff) << 16) | xoff, par);
123 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
124 }
125
126 /* Set color map */
127 if (cursor->set & FB_CUR_SETCMAP) {
128 u32 fg_idx, bg_idx, fg, bg;
129
130 fg_idx = cursor->image.fg_color;
131 bg_idx = cursor->image.bg_color;
132
133 fg = (info->cmap.red[fg_idx] << 24) |
134 (info->cmap.green[fg_idx] << 16) |
135 (info->cmap.blue[fg_idx] << 8) | 15;
136
137 bg = (info->cmap.red[bg_idx] << 24) |
138 (info->cmap.green[bg_idx] << 16) |
139 (info->cmap.blue[bg_idx] << 8);
140
141 wait_for_fifo(2, par);
142 aty_st_le32(CUR_CLR0, bg, par);
143 aty_st_le32(CUR_CLR1, fg, par);
144 }
145
146 if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
147 u8 *src = (u8 *)cursor->image.data;
148 u8 *msk = (u8 *)cursor->mask;
149 u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
150 unsigned int width = (cursor->image.width + 7) >> 3;
151 unsigned int height = cursor->image.height;
152 unsigned int align = info->sprite.scan_align;
153
154 unsigned int i, j, offset;
155 u8 m, b;
156
157 // Clear cursor image with 1010101010...
158 fb_memset(dst, 0xaa, 1024);
159
160 offset = align - width*2;
161
162 for (i = 0; i < height; i++) {
163 for (j = 0; j < width; j++) {
164 b = *src++;
165 m = *msk++;
166 switch (cursor->rop) {
167 case ROP_XOR:
168 // Upper 4 bits of mask data
169 fb_writeb(cursor_mask_lookup[m >> 4 ] |
170 cursor_bits_lookup[(b ^ m) >> 4], dst++);
171 // Lower 4 bits of mask
172 fb_writeb(cursor_mask_lookup[m & 0x0f ] |
173 cursor_bits_lookup[(b ^ m) & 0x0f], dst++);
174 break;
175 case ROP_COPY:
176 // Upper 4 bits of mask data
177 fb_writeb(cursor_mask_lookup[m >> 4 ] |
178 cursor_bits_lookup[(b & m) >> 4], dst++);
179 // Lower 4 bits of mask
180 fb_writeb(cursor_mask_lookup[m & 0x0f ] |
181 cursor_bits_lookup[(b & m) & 0x0f], dst++);
182 break;
183 }
184 }
185 dst += offset;
186 }
187 }
188
189 if (cursor->enable) {
190 wait_for_fifo(1, par);
191 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
192 | HWCURSOR_ENABLE, par);
193 }
194 return 0;
195 }
196
197 int __init aty_init_cursor(struct fb_info *info)
198 {
199 unsigned long addr;
200
201 info->fix.smem_len -= PAGE_SIZE;
202
203 #ifdef __sparc__
204 addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
205 info->sprite.addr = (u8 *) addr;
206 #else
207 #ifdef __BIG_ENDIAN
208 addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
209 info->sprite.addr = (u8 *) ioremap(addr, 1024);
210 #else
211 addr = (unsigned long) info->screen_base + info->fix.smem_len;
212 info->sprite.addr = (u8 *) addr;
213 #endif
214 #endif
215 if (!info->sprite.addr)
216 return -ENXIO;
217 info->sprite.size = PAGE_SIZE;
218 info->sprite.scan_align = 16; /* Scratch pad 64 bytes wide */
219 info->sprite.buf_align = 16; /* and 64 lines tall. */
220 info->sprite.flags = FB_PIXMAP_IO;
221
222 info->fbops->fb_cursor = atyfb_cursor;
223
224 return 0;
225 }
226
227
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