227 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * ATI Mach64 CT/VT/GT/LT Cursor Support4 */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#endif16 17#include <video/mach64.h>18#include "atyfb.h"19 20/*21 * The hardware cursor definition requires 2 bits per pixel. The22 * Cursor size reguardless of the visible cursor size is 64 pixels23 * by 64 lines. The total memory required to define the cursor is24 * 16 bytes / line for 64 lines or 1024 bytes of data. The data25 * must be in a contigiuos format. The 2 bit cursor code values are26 * as follows:27 *28 * 00 - pixel colour = CURSOR_CLR_029 * 01 - pixel colour = CURSOR_CLR_130 * 10 - pixel colour = transparent (current display pixel)31 * 11 - pixel colour = 1's complement of current display pixel32 *33 * Cursor Offset 64 pixels Actual Displayed Area34 * \_________________________/35 * | | | |36 * |<--------------->| | |37 * | CURS_HORZ_OFFSET| | |38 * | |_______| | 64 Lines39 * | ^ | |40 * | | | |41 * | CURS_VERT_OFFSET| |42 * | | | |43 * |____________________|____| |44 *45 *46 * The Screen position of the top left corner of the displayed47 * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken48 * when the cursor hot spot is not the top left corner and the49 * physical cursor position becomes negative. It will be displayed50 * if either the horizontal or vertical cursor position is negative51 *52 * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET53 * 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 cursor57 * 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, 0x5566};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#endif78 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 else86 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 location111 * 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 data168 l = cursor_bits_lookup[(b ^ m) >> 4] |169 // Lower 4 bits of mask170 (cursor_bits_lookup[(b ^ m) & 0x0f] << 8);171 break;172 case ROP_COPY:173 // Upper 4 bits of mask data174 l = cursor_bits_lookup[(b & m) >> 4] |175 // Lower 4 bits of mask176 (cursor_bits_lookup[(b & m) & 0x0f] << 8);177 break;178 }179 /*180 * If cursor size is not a multiple of 8 characters181 * 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 197int 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#else207#ifdef __BIG_ENDIAN208 addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;209 info->sprite.addr = (u8 *) ioremap(addr, 1024);210#else211 addr = (unsigned long) info->screen_base + info->fix.smem_len;212 info->sprite.addr = (u8 *) addr;213#endif214#endif215 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