1/* 2 * ATI Mach64 CT/VT/GT/LT Cursor Support 3 */ 4 5#include <linux/slab.h> 6#include <linux/fb.h> 7#include <linux/init.h> 8#include <linux/string.h> 9 10#include <asm/io.h> 11#include <asm/uaccess.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 appropraite line in the cursor 57 * definitation and CUR_VERT_POSN must be saturated to zero. 58 */ 59 60 /* 61 * Hardware Cursor support. 62 */ 63static 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 68static 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 /* Hide cursor */ 82 wait_for_fifo(1, par); 83 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) & ~HWCURSOR_ENABLE, par); 84 85 /* set position */ 86 if (cursor->set & FB_CUR_SETPOS) { 87 x = cursor->image.dx - cursor->hot.x - info->var.xoffset; 88 if (x < 0) { 89 xoff = -x; 90 x = 0; 91 } else { 92 xoff = 0; 93 } 94 95 y = cursor->image.dy - cursor->hot.y - info->var.yoffset; 96 if (y < 0) { 97 yoff = -y; 98 y = 0; 99 } else { 100 yoff = 0; 101 } 102 103 h = cursor->image.height; 104 105 /* 106 * In doublescan mode, the cursor location 107 * and heigh also needs to be doubled. 108 */ 109 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) { 110 y<<=1; 111 h<<=1; 112 } 113 wait_for_fifo(4, par); 114 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par); 115 aty_st_le32(CUR_HORZ_VERT_OFF, 116 ((u32) (64 - h + yoff) << 16) | xoff, par); 117 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par); 118 } 119 120 /* Set color map */ 121 if (cursor->set & FB_CUR_SETCMAP) { 122 u32 fg_idx, bg_idx, fg, bg; 123 124 fg_idx = cursor->image.fg_color; 125 bg_idx = cursor->image.bg_color; 126 127 fg = ((info->cmap.red[fg_idx] & 0xff) << 24) | 128 ((info->cmap.green[fg_idx] & 0xff) << 16) | 129 ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff; 130 131 bg = ((info->cmap.red[bg_idx] & 0xff) << 24) | 132 ((info->cmap.green[bg_idx] & 0xff) << 16) | 133 ((info->cmap.blue[bg_idx] & 0xff) << 8); 134 135 wait_for_fifo(2, par); 136 aty_st_le32(CUR_CLR0, bg, par); 137 aty_st_le32(CUR_CLR1, fg, par); 138 } 139 140 if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) { 141 u8 *src = (u8 *)cursor->image.data; 142 u8 *msk = (u8 *)cursor->mask; 143 u8 __iomem *dst = (u8 __iomem *)info->sprite.addr; 144 unsigned int width = (cursor->image.width + 7) >> 3; 145 unsigned int height = cursor->image.height; 146 unsigned int align = info->sprite.scan_align; 147 148 unsigned int i, j, offset; 149 u8 m, b; 150 151 // Clear cursor image with 1010101010... 152 fb_memset(dst, 0xaa, 1024); 153 154 offset = align - width*2; 155 156 for (i = 0; i < height; i++) { 157 for (j = 0; j < width; j++) { 158 b = *src++; 159 m = *msk++; 160 switch (cursor->rop) { 161 case ROP_XOR: 162 // Upper 4 bits of mask data 163 fb_writeb(cursor_bits_lookup[(b ^ m) >> 4], dst++); 164 // Lower 4 bits of mask 165 fb_writeb(cursor_bits_lookup[(b ^ m) & 0x0f], 166 dst++); 167 break; 168 case ROP_COPY: 169 // Upper 4 bits of mask data 170 fb_writeb(cursor_bits_lookup[(b & m) >> 4], dst++); 171 // Lower 4 bits of mask 172 fb_writeb(cursor_bits_lookup[(b & m) & 0x0f], 173 dst++); 174 break; 175 } 176 } 177 dst += offset; 178 } 179 } 180 181 if (cursor->enable) { 182 wait_for_fifo(1, par); 183 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) 184 | HWCURSOR_ENABLE, par); 185 } 186 return 0; 187} 188 189int __devinit aty_init_cursor(struct fb_info *info) 190{ 191 unsigned long addr; 192 193 info->fix.smem_len -= PAGE_SIZE; 194 195#ifdef __sparc__ 196 addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len; 197 info->sprite.addr = (u8 *) addr; 198#else 199#ifdef __BIG_ENDIAN 200 addr = info->fix.smem_start - 0x800000 + info->fix.smem_len; 201 info->sprite.addr = (u8 *) ioremap(addr, 1024); 202#else 203 addr = (unsigned long) info->screen_base + info->fix.smem_len; 204 info->sprite.addr = (u8 *) addr; 205#endif 206#endif 207 if (!info->sprite.addr) 208 return -ENXIO; 209 info->sprite.size = PAGE_SIZE; 210 info->sprite.scan_align = 16; /* Scratch pad 64 bytes wide */ 211 info->sprite.buf_align = 16; /* and 64 lines tall. */ 212 info->sprite.flags = FB_PIXMAP_IO; 213 214 info->fbops->fb_cursor = atyfb_cursor; 215 216 return 0; 217} 218