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 */ 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 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 } 201 202 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