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 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(entries: 1, par); |
82 | if (cursor->enable) |
83 | aty_st_le32(GEN_TEST_CNTL, val: aty_ld_le32(GEN_TEST_CNTL, par) |
84 | | HWCURSOR_ENABLE, par); |
85 | else |
86 | aty_st_le32(GEN_TEST_CNTL, val: 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(entries: 3, par); |
118 | aty_st_le32(CUR_OFFSET, val: (info->fix.smem_len >> 3) + (yoff << 1), par); |
119 | aty_st_le32(CUR_HORZ_VERT_OFF, |
120 | val: ((u32) (64 - h + yoff) << 16) | xoff, par); |
121 | aty_st_le32(CUR_HORZ_VERT_POSN, val: ((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(entries: 2, par); |
140 | aty_st_le32(CUR_CLR0, val: bg, par); |
141 | aty_st_le32(CUR_CLR1, val: 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_io(addr: dst, c: 0xaa, n: 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(a: l, b: 0xaaaa, |
185 | mask: (1 << ((cursor->image.width & 7) * 2)) - 1); |
186 | } |
187 | fb_writeb(b: l & 0xff, addr: dst++); |
188 | fb_writeb(b: l >> 8, addr: dst++); |
189 | } |
190 | dst += offset; |
191 | } |
192 | } |
193 | |
194 | return 0; |
195 | } |
196 | |
197 | int aty_init_cursor(struct fb_info *info, struct fb_ops *atyfb_ops) |
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 | atyfb_ops->fb_cursor = atyfb_cursor; |
223 | |
224 | return 0; |
225 | } |
226 | |
227 | |