--- /dev/null
+/*
+ * 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 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)
+{
+ 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;
+
+ info->fbops->fb_cursor = atyfb_cursor;
+
+ return 0;
+}
+
Code Review / kvmfornfv.git / blobdiff