diff options
Diffstat (limited to 'drivers/video/fbdev/aty/mach64_cursor.c')
| -rw-r--r-- | drivers/video/fbdev/aty/mach64_cursor.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/drivers/video/fbdev/aty/mach64_cursor.c b/drivers/video/fbdev/aty/mach64_cursor.c new file mode 100644 index 000000000..4ad0331a8 --- /dev/null +++ b/drivers/video/fbdev/aty/mach64_cursor.c @@ -0,0 +1,226 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ATI Mach64 CT/VT/GT/LT Cursor Support + */ + +#include <linux/fb.h> +#include <linux/init.h> +#include <linux/string.h> +#include "../core/fb_draw.h" + +#include <asm/io.h> + +#ifdef __sparc__ +#include <asm/fbio.h> +#endif + +#include <video/mach64.h> +#include "atyfb.h" + +/* + * The hardware cursor definition requires 2 bits per pixel. The + * Cursor size reguardless of the visible cursor size is 64 pixels + * by 64 lines. The total memory required to define the cursor is + * 16 bytes / line for 64 lines or 1024 bytes of data. The data + * must be in a contigiuos format. The 2 bit cursor code values are + * as follows: + * + * 00 - pixel colour = CURSOR_CLR_0 + * 01 - pixel colour = CURSOR_CLR_1 + * 10 - pixel colour = transparent (current display pixel) + * 11 - pixel colour = 1's complement of current display pixel + * + * Cursor Offset 64 pixels Actual Displayed Area + * \_________________________/ + * | | | | + * |<--------------->| | | + * | CURS_HORZ_OFFSET| | | + * | |_______| | 64 Lines + * | ^ | | + * | | | | + * | CURS_VERT_OFFSET| | + * | | | | + * |____________________|____| | + * + * + * The Screen position of the top left corner of the displayed + * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken + * when the cursor hot spot is not the top left corner and the + * physical cursor position becomes negative. It will be displayed + * if either the horizontal or vertical cursor position is negative + * + * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET + * to a larger number and saturate CUR_HORZ_POSN to zero. + * + * if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number, + * CUR_OFFSET must be adjusted to a point to the appropriate line in the cursor + * definitation and CUR_VERT_POSN must be saturated to zero. + */ + + /* + * Hardware Cursor support. + */ +static const u8 cursor_bits_lookup[16] = { + 0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54, + 0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55 +}; + +static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor) +{ + struct atyfb_par *par = (struct atyfb_par *) info->par; + u16 xoff, yoff; + int x, y, h; + +#ifdef __sparc__ + if (par->mmaped) + return -EPERM; +#endif + if (par->asleep) + return -EPERM; + + wait_for_fifo(1, par); + if (cursor->enable) + aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) + | HWCURSOR_ENABLE, par); + else + aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) + & ~HWCURSOR_ENABLE, par); + + /* set position */ + if (cursor->set & FB_CUR_SETPOS) { + x = cursor->image.dx - cursor->hot.x - info->var.xoffset; + if (x < 0) { + xoff = -x; + x = 0; + } else { + xoff = 0; + } + + y = cursor->image.dy - cursor->hot.y - info->var.yoffset; + if (y < 0) { + yoff = -y; + y = 0; + } else { + yoff = 0; + } + + h = cursor->image.height; + + /* + * In doublescan mode, the cursor location + * and heigh also needs to be doubled. + */ + if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) { + y<<=1; + h<<=1; + } + wait_for_fifo(3, par); + aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par); + aty_st_le32(CUR_HORZ_VERT_OFF, + ((u32) (64 - h + yoff) << 16) | xoff, par); + aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par); + } + + /* Set color map */ + if (cursor->set & FB_CUR_SETCMAP) { + u32 fg_idx, bg_idx, fg, bg; + + fg_idx = cursor->image.fg_color; + bg_idx = cursor->image.bg_color; + + fg = ((info->cmap.red[fg_idx] & 0xff) << 24) | + ((info->cmap.green[fg_idx] & 0xff) << 16) | + ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff; + + bg = ((info->cmap.red[bg_idx] & 0xff) << 24) | + ((info->cmap.green[bg_idx] & 0xff) << 16) | + ((info->cmap.blue[bg_idx] & 0xff) << 8); + + wait_for_fifo(2, par); + aty_st_le32(CUR_CLR0, bg, par); + aty_st_le32(CUR_CLR1, fg, par); + } + + if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) { + u8 *src = (u8 *)cursor->image.data; + u8 *msk = (u8 *)cursor->mask; + u8 __iomem *dst = (u8 __iomem *)info->sprite.addr; + unsigned int width = (cursor->image.width + 7) >> 3; + unsigned int height = cursor->image.height; + unsigned int align = info->sprite.scan_align; + + unsigned int i, j, offset; + u8 m, b; + + // Clear cursor image with 1010101010... + fb_memset(dst, 0xaa, 1024); + + offset = align - width*2; + + for (i = 0; i < height; i++) { + for (j = 0; j < width; j++) { + u16 l = 0xaaaa; + b = *src++; + m = *msk++; + switch (cursor->rop) { + case ROP_XOR: + // Upper 4 bits of mask data + l = cursor_bits_lookup[(b ^ m) >> 4] | + // Lower 4 bits of mask + (cursor_bits_lookup[(b ^ m) & 0x0f] << 8); + break; + case ROP_COPY: + // Upper 4 bits of mask data + l = cursor_bits_lookup[(b & m) >> 4] | + // Lower 4 bits of mask + (cursor_bits_lookup[(b & m) & 0x0f] << 8); + break; + } + /* + * If cursor size is not a multiple of 8 characters + * we must pad it with transparent pattern (0xaaaa). + */ + if ((j + 1) * 8 > cursor->image.width) { + l = comp(l, 0xaaaa, + (1 << ((cursor->image.width & 7) * 2)) - 1); + } + fb_writeb(l & 0xff, dst++); + fb_writeb(l >> 8, dst++); + } + dst += offset; + } + } + + return 0; +} + +int aty_init_cursor(struct fb_info *info, struct fb_ops *atyfb_ops) +{ + unsigned long addr; + + info->fix.smem_len -= PAGE_SIZE; + +#ifdef __sparc__ + addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len; + info->sprite.addr = (u8 *) addr; +#else +#ifdef __BIG_ENDIAN + addr = info->fix.smem_start - 0x800000 + info->fix.smem_len; + info->sprite.addr = (u8 *) ioremap(addr, 1024); +#else + addr = (unsigned long) info->screen_base + info->fix.smem_len; + info->sprite.addr = (u8 *) addr; +#endif +#endif + if (!info->sprite.addr) + return -ENXIO; + info->sprite.size = PAGE_SIZE; + info->sprite.scan_align = 16; /* Scratch pad 64 bytes wide */ + info->sprite.buf_align = 16; /* and 64 lines tall. */ + info->sprite.flags = FB_PIXMAP_IO; + + atyfb_ops->fb_cursor = atyfb_cursor; + + return 0; +} + |