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226 lines
6.0 KiB
226 lines
6.0 KiB
/*
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* ATI Mach64 CT/VT/GT/LT Cursor Support
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*/
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#include <linux/slab.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#ifdef __sparc__
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#include <asm/pbm.h>
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#include <asm/fbio.h>
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#endif
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#include <video/mach64.h>
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#include "atyfb.h"
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/*
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* The hardware cursor definition requires 2 bits per pixel. The
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* Cursor size reguardless of the visible cursor size is 64 pixels
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* by 64 lines. The total memory required to define the cursor is
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* 16 bytes / line for 64 lines or 1024 bytes of data. The data
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* must be in a contigiuos format. The 2 bit cursor code values are
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* as follows:
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*
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* 00 - pixel colour = CURSOR_CLR_0
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* 01 - pixel colour = CURSOR_CLR_1
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* 10 - pixel colour = transparent (current display pixel)
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* 11 - pixel colour = 1's complement of current display pixel
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*
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* Cursor Offset 64 pixels Actual Displayed Area
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* \_________________________/
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* | | | |
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* |<--------------->| | |
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* | CURS_HORZ_OFFSET| | |
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* | |_______| | 64 Lines
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* | ^ | |
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* | | | |
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* | CURS_VERT_OFFSET| |
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* | | | |
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* |____________________|____| |
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*
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*
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* The Screen position of the top left corner of the displayed
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* cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
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* when the cursor hot spot is not the top left corner and the
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* physical cursor position becomes negative. It will be be displayed
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* if either the horizontal or vertical cursor position is negative
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*
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* If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
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* to a larger number and saturate CUR_HORZ_POSN to zero.
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*
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* if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
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* CUR_OFFSET must be adjusted to a point to the appropraite line in the cursor
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* definitation and CUR_VERT_POSN must be saturated to zero.
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*/
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/*
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* Hardware Cursor support.
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*/
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static const u8 cursor_bits_lookup[16] = {
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0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
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0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
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};
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static const u8 cursor_mask_lookup[16] = {
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0xaa, 0x2a, 0x8a, 0x0a, 0xa2, 0x22, 0x82, 0x02,
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0xa8, 0x28, 0x88, 0x08, 0xa0, 0x20, 0x80, 0x00
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};
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static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
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{
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struct atyfb_par *par = (struct atyfb_par *) info->par;
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u16 xoff, yoff;
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int x, y, h;
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#ifdef __sparc__
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if (par->mmaped)
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return -EPERM;
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#endif
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if (par->asleep)
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return -EPERM;
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/* Hide cursor */
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wait_for_fifo(1, par);
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aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) & ~HWCURSOR_ENABLE, par);
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/* set position */
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if (cursor->set & FB_CUR_SETPOS) {
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x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
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if (x < 0) {
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xoff = -x;
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x = 0;
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} else {
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xoff = 0;
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}
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y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
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if (y < 0) {
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yoff = -y;
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y = 0;
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} else {
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yoff = 0;
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}
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h = cursor->image.height;
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/*
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* In doublescan mode, the cursor location
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* and heigh also needs to be doubled.
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*/
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if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
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y<<=1;
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h<<=1;
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}
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wait_for_fifo(4, par);
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aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
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aty_st_le32(CUR_HORZ_VERT_OFF,
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((u32) (64 - h + yoff) << 16) | xoff, par);
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aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
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}
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/* Set color map */
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if (cursor->set & FB_CUR_SETCMAP) {
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u32 fg_idx, bg_idx, fg, bg;
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fg_idx = cursor->image.fg_color;
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bg_idx = cursor->image.bg_color;
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fg = (info->cmap.red[fg_idx] << 24) |
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(info->cmap.green[fg_idx] << 16) |
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(info->cmap.blue[fg_idx] << 8) | 15;
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bg = (info->cmap.red[bg_idx] << 24) |
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(info->cmap.green[bg_idx] << 16) |
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(info->cmap.blue[bg_idx] << 8);
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wait_for_fifo(2, par);
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aty_st_le32(CUR_CLR0, bg, par);
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aty_st_le32(CUR_CLR1, fg, par);
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}
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if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
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u8 *src = (u8 *)cursor->image.data;
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u8 *msk = (u8 *)cursor->mask;
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u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
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unsigned int width = (cursor->image.width + 7) >> 3;
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unsigned int height = cursor->image.height;
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unsigned int align = info->sprite.scan_align;
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unsigned int i, j, offset;
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u8 m, b;
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// Clear cursor image with 1010101010...
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fb_memset(dst, 0xaa, 1024);
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offset = align - width*2;
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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b = *src++;
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m = *msk++;
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switch (cursor->rop) {
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case ROP_XOR:
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// Upper 4 bits of mask data
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fb_writeb(cursor_mask_lookup[m >> 4 ] |
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cursor_bits_lookup[(b ^ m) >> 4], dst++);
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// Lower 4 bits of mask
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fb_writeb(cursor_mask_lookup[m & 0x0f ] |
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cursor_bits_lookup[(b ^ m) & 0x0f], dst++);
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break;
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case ROP_COPY:
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// Upper 4 bits of mask data
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fb_writeb(cursor_mask_lookup[m >> 4 ] |
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cursor_bits_lookup[(b & m) >> 4], dst++);
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// Lower 4 bits of mask
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fb_writeb(cursor_mask_lookup[m & 0x0f ] |
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cursor_bits_lookup[(b & m) & 0x0f], dst++);
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break;
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}
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}
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dst += offset;
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}
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}
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if (cursor->enable) {
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wait_for_fifo(1, par);
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aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
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| HWCURSOR_ENABLE, par);
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}
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return 0;
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}
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int __init aty_init_cursor(struct fb_info *info)
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{
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unsigned long addr;
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info->fix.smem_len -= PAGE_SIZE;
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#ifdef __sparc__
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addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
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info->sprite.addr = (u8 *) addr;
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#else
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#ifdef __BIG_ENDIAN
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addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
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info->sprite.addr = (u8 *) ioremap(addr, 1024);
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#else
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addr = (unsigned long) info->screen_base + info->fix.smem_len;
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info->sprite.addr = (u8 *) addr;
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#endif
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#endif
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if (!info->sprite.addr)
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return -ENXIO;
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info->sprite.size = PAGE_SIZE;
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info->sprite.scan_align = 16; /* Scratch pad 64 bytes wide */
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info->sprite.buf_align = 16; /* and 64 lines tall. */
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info->sprite.flags = FB_PIXMAP_IO;
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info->fbops->fb_cursor = atyfb_cursor;
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return 0;
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}
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