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 
227