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(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_io(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, 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