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
10 #include <asm/io.h>
11
12 #ifdef __sparc__
13 #include <asm/fbio.h>
14 #endif
15
16 #include <video/mach64.h>
17 #include "atyfb.h"
18
19 /*
20 * The hardware cursor definition requires 2 bits per pixel. The
21 * Cursor size reguardless of the visible cursor size is 64 pixels
22 * by 64 lines. The total memory required to define the cursor is
23 * 16 bytes / line for 64 lines or 1024 bytes of data. The data
24 * must be in a contigiuos format. The 2 bit cursor code values are
25 * as follows:
26 *
27 * 00 - pixel colour = CURSOR_CLR_0
28 * 01 - pixel colour = CURSOR_CLR_1
29 * 10 - pixel colour = transparent (current display pixel)
30 * 11 - pixel colour = 1's complement of current display pixel
31 *
32 * Cursor Offset 64 pixels Actual Displayed Area
33 * \_________________________/
34 * | | | |
35 * |<--------------->| | |
36 * | CURS_HORZ_OFFSET| | |
37 * | |_______| | 64 Lines
38 * | ^ | |
39 * | | | |
40 * | CURS_VERT_OFFSET| |
41 * | | | |
42 * |____________________|____| |
43 *
44 *
45 * The Screen position of the top left corner of the displayed
46 * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
47 * when the cursor hot spot is not the top left corner and the
48 * physical cursor position becomes negative. It will be displayed
49 * if either the horizontal or vertical cursor position is negative
50 *
51 * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
52 * to a larger number and saturate CUR_HORZ_POSN to zero.
53 *
54 * if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
55 * CUR_OFFSET must be adjusted to a point to the appropriate line in the cursor
56 * definitation and CUR_VERT_POSN must be saturated to zero.
57 */
58
59 /* compose pixels based on mask */
comp(unsigned long set,unsigned long unset,unsigned long mask)60 static inline unsigned long comp(unsigned long set, unsigned long unset, unsigned long mask)
61 {
62 return ((set ^ unset) & mask) ^ unset;
63 }
64
65 /*
66 * Hardware Cursor support.
67 */
68 static const u8 cursor_bits_lookup[16] = {
69 0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
70 0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
71 };
72
atyfb_cursor(struct fb_info * info,struct fb_cursor * cursor)73 static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
74 {
75 struct atyfb_par *par = (struct atyfb_par *) info->par;
76 u16 xoff, yoff;
77 int x, y, h;
78
79 #ifdef __sparc__
80 if (par->mmaped)
81 return -EPERM;
82 #endif
83 if (par->asleep)
84 return -EPERM;
85
86 wait_for_fifo(1, par);
87 if (cursor->enable)
88 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
89 | HWCURSOR_ENABLE, par);
90 else
91 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
92 & ~HWCURSOR_ENABLE, par);
93
94 /* set position */
95 if (cursor->set & FB_CUR_SETPOS) {
96 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
97 if (x < 0) {
98 xoff = -x;
99 x = 0;
100 } else {
101 xoff = 0;
102 }
103
104 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
105 if (y < 0) {
106 yoff = -y;
107 y = 0;
108 } else {
109 yoff = 0;
110 }
111
112 h = cursor->image.height;
113
114 /*
115 * In doublescan mode, the cursor location
116 * and heigh also needs to be doubled.
117 */
118 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
119 y<<=1;
120 h<<=1;
121 }
122 wait_for_fifo(3, par);
123 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
124 aty_st_le32(CUR_HORZ_VERT_OFF,
125 ((u32) (64 - h + yoff) << 16) | xoff, par);
126 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
127 }
128
129 /* Set color map */
130 if (cursor->set & FB_CUR_SETCMAP) {
131 u32 fg_idx, bg_idx, fg, bg;
132
133 fg_idx = cursor->image.fg_color;
134 bg_idx = cursor->image.bg_color;
135
136 fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
137 ((info->cmap.green[fg_idx] & 0xff) << 16) |
138 ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
139
140 bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
141 ((info->cmap.green[bg_idx] & 0xff) << 16) |
142 ((info->cmap.blue[bg_idx] & 0xff) << 8);
143
144 wait_for_fifo(2, par);
145 aty_st_le32(CUR_CLR0, bg, par);
146 aty_st_le32(CUR_CLR1, fg, par);
147 }
148
149 if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
150 u8 *src = (u8 *)cursor->image.data;
151 u8 *msk = (u8 *)cursor->mask;
152 u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
153 unsigned int width = (cursor->image.width + 7) >> 3;
154 unsigned int height = cursor->image.height;
155 unsigned int align = info->sprite.scan_align;
156
157 unsigned int i, j, offset;
158 u8 m, b;
159
160 // Clear cursor image with 1010101010...
161 fb_memset_io(dst, 0xaa, 1024);
162
163 offset = align - width*2;
164
165 for (i = 0; i < height; i++) {
166 for (j = 0; j < width; j++) {
167 u16 l = 0xaaaa;
168 b = *src++;
169 m = *msk++;
170 switch (cursor->rop) {
171 case ROP_XOR:
172 // Upper 4 bits of mask data
173 l = cursor_bits_lookup[(b ^ m) >> 4] |
174 // Lower 4 bits of mask
175 (cursor_bits_lookup[(b ^ m) & 0x0f] << 8);
176 break;
177 case ROP_COPY:
178 // Upper 4 bits of mask data
179 l = cursor_bits_lookup[(b & m) >> 4] |
180 // Lower 4 bits of mask
181 (cursor_bits_lookup[(b & m) & 0x0f] << 8);
182 break;
183 }
184 /*
185 * If cursor size is not a multiple of 8 characters
186 * we must pad it with transparent pattern (0xaaaa).
187 */
188 if ((j + 1) * 8 > cursor->image.width) {
189 l = comp(l, 0xaaaa,
190 (1 << ((cursor->image.width & 7) * 2)) - 1);
191 }
192 fb_writeb(l & 0xff, dst++);
193 fb_writeb(l >> 8, dst++);
194 }
195 dst += offset;
196 }
197 }
198
199 return 0;
200 }
201
aty_init_cursor(struct fb_info * info,struct fb_ops * atyfb_ops)202 int aty_init_cursor(struct fb_info *info, struct fb_ops *atyfb_ops)
203 {
204 unsigned long addr;
205
206 info->fix.smem_len -= PAGE_SIZE;
207
208 #ifdef __sparc__
209 addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
210 info->sprite.addr = (u8 *) addr;
211 #else
212 #ifdef __BIG_ENDIAN
213 addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
214 info->sprite.addr = (u8 *) ioremap(addr, 1024);
215 #else
216 addr = (unsigned long) info->screen_base + info->fix.smem_len;
217 info->sprite.addr = (u8 *) addr;
218 #endif
219 #endif
220 if (!info->sprite.addr)
221 return -ENXIO;
222 info->sprite.size = PAGE_SIZE;
223 info->sprite.scan_align = 16; /* Scratch pad 64 bytes wide */
224 info->sprite.buf_align = 16; /* and 64 lines tall. */
225 info->sprite.flags = FB_PIXMAP_IO;
226
227 atyfb_ops->fb_cursor = atyfb_cursor;
228
229 return 0;
230 }
231
232