1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ATI Mach64 CT/VT/GT/LT Cursor Support
4 */
5
6 #include <linux/fb.h>
7 #include <linux/init.h>
8 #include <linux/string.h>
9 #include "../core/fb_draw.h"
10
11 #include <asm/io.h>
12
13 #ifdef __sparc__
14 #include <asm/fbio.h>
15 #endif
16
17 #include <video/mach64.h>
18 #include "atyfb.h"
19
20 /*
21 * The hardware cursor definition requires 2 bits per pixel. The
22 * Cursor size reguardless of the visible cursor size is 64 pixels
23 * by 64 lines. The total memory required to define the cursor is
24 * 16 bytes / line for 64 lines or 1024 bytes of data. The data
25 * must be in a contigiuos format. The 2 bit cursor code values are
26 * as follows:
27 *
28 * 00 - pixel colour = CURSOR_CLR_0
29 * 01 - pixel colour = CURSOR_CLR_1
30 * 10 - pixel colour = transparent (current display pixel)
31 * 11 - pixel colour = 1's complement of current display pixel
32 *
33 * Cursor Offset 64 pixels Actual Displayed Area
34 * \_________________________/
35 * | | | |
36 * |<--------------->| | |
37 * | CURS_HORZ_OFFSET| | |
38 * | |_______| | 64 Lines
39 * | ^ | |
40 * | | | |
41 * | CURS_VERT_OFFSET| |
42 * | | | |
43 * |____________________|____| |
44 *
45 *
46 * The Screen position of the top left corner of the displayed
47 * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
48 * when the cursor hot spot is not the top left corner and the
49 * physical cursor position becomes negative. It will be be displayed
50 * if either the horizontal or vertical cursor position is negative
51 *
52 * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
53 * to a larger number and saturate CUR_HORZ_POSN to zero.
54 *
55 * if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
56 * CUR_OFFSET must be adjusted to a point to the appropriate line in the cursor
57 * definitation and CUR_VERT_POSN must be saturated to zero.
58 */
59
60 /*
61 * Hardware Cursor support.
62 */
63 static const u8 cursor_bits_lookup[16] = {
64 0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
65 0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
66 };
67
68 static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
69 {
70 struct atyfb_par *par = (struct atyfb_par *) info->par;
71 u16 xoff, yoff;
72 int x, y, h;
73
74 #ifdef __sparc__
75 if (par->mmaped)
76 return -EPERM;
77 #endif
78 if (par->asleep)
79 return -EPERM;
80
81 wait_for_fifo(1, par);
82 if (cursor->enable)
83 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
84 | HWCURSOR_ENABLE, par);
85 else
86 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
87 & ~HWCURSOR_ENABLE, par);
88
89 /* set position */
90 if (cursor->set & FB_CUR_SETPOS) {
91 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
92 if (x < 0) {
93 xoff = -x;
94 x = 0;
95 } else {
96 xoff = 0;
97 }
98
99 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
100 if (y < 0) {
101 yoff = -y;
102 y = 0;
103 } else {
104 yoff = 0;
105 }
106
107 h = cursor->image.height;
108
109 /*
110 * In doublescan mode, the cursor location
111 * and heigh also needs to be doubled.
112 */
113 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
114 y<<=1;
115 h<<=1;
116 }
117 wait_for_fifo(3, par);
118 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
119 aty_st_le32(CUR_HORZ_VERT_OFF,
120 ((u32) (64 - h + yoff) << 16) | xoff, par);
121 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
122 }
123
124 /* Set color map */
125 if (cursor->set & FB_CUR_SETCMAP) {
126 u32 fg_idx, bg_idx, fg, bg;
127
128 fg_idx = cursor->image.fg_color;
129 bg_idx = cursor->image.bg_color;
130
131 fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
132 ((info->cmap.green[fg_idx] & 0xff) << 16) |
133 ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
134
135 bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
136 ((info->cmap.green[bg_idx] & 0xff) << 16) |
137 ((info->cmap.blue[bg_idx] & 0xff) << 8);
138
139 wait_for_fifo(2, par);
140 aty_st_le32(CUR_CLR0, bg, par);
141 aty_st_le32(CUR_CLR1, fg, par);
142 }
143
144 if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
145 u8 *src = (u8 *)cursor->image.data;
146 u8 *msk = (u8 *)cursor->mask;
147 u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
148 unsigned int width = (cursor->image.width + 7) >> 3;
149 unsigned int height = cursor->image.height;
150 unsigned int align = info->sprite.scan_align;
151
152 unsigned int i, j, offset;
153 u8 m, b;
154
155 // Clear cursor image with 1010101010...
156 fb_memset(dst, 0xaa, 1024);
157
158 offset = align - width*2;
159
160 for (i = 0; i < height; i++) {
161 for (j = 0; j < width; j++) {
162 u16 l = 0xaaaa;
163 b = *src++;
164 m = *msk++;
165 switch (cursor->rop) {
166 case ROP_XOR:
167 // Upper 4 bits of mask data
168 l = cursor_bits_lookup[(b ^ m) >> 4] |
169 // Lower 4 bits of mask
170 (cursor_bits_lookup[(b ^ m) & 0x0f] << 8);
171 break;
172 case ROP_COPY:
173 // Upper 4 bits of mask data
174 l = cursor_bits_lookup[(b & m) >> 4] |
175 // Lower 4 bits of mask
176 (cursor_bits_lookup[(b & m) & 0x0f] << 8);
177 break;
178 }
179 /*
180 * If cursor size is not a multiple of 8 characters
181 * we must pad it with transparent pattern (0xaaaa).
182 */
183 if ((j + 1) * 8 > cursor->image.width) {
184 l = comp(l, 0xaaaa,
185 (1 << ((cursor->image.width & 7) * 2)) - 1);
186 }
187 fb_writeb(l & 0xff, dst++);
188 fb_writeb(l >> 8, dst++);
189 }
190 dst += offset;
191 }
192 }
193
194 return 0;
195 }
196
197 int 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