--- /dev/null
+/*
+ * linux/drivers/video/bt431.h
+ *
+ * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file COPYING in the main directory of this
+ * archive for more details.
+ */
+#include <linux/types.h>
+
+/*
+ * Bt431 cursor generator registers, 32-bit aligned.
+ * Two twin Bt431 are used on the DECstation's PMAG-AA.
+ */
+struct bt431_regs {
+ volatile u16 addr_lo;
+ u16 pad0;
+ volatile u16 addr_hi;
+ u16 pad1;
+ volatile u16 addr_cmap;
+ u16 pad2;
+ volatile u16 addr_reg;
+ u16 pad3;
+};
+
+static inline u16 bt431_set_value(u8 val)
+{
+ return ((val << 8) | (val & 0xff)) & 0xffff;
+}
+
+static inline u8 bt431_get_value(u16 val)
+{
+ return val & 0xff;
+}
+
+/*
+ * Additional registers addressed indirectly.
+ */
+#define BT431_REG_CMD 0x0000
+#define BT431_REG_CXLO 0x0001
+#define BT431_REG_CXHI 0x0002
+#define BT431_REG_CYLO 0x0003
+#define BT431_REG_CYHI 0x0004
+#define BT431_REG_WXLO 0x0005
+#define BT431_REG_WXHI 0x0006
+#define BT431_REG_WYLO 0x0007
+#define BT431_REG_WYHI 0x0008
+#define BT431_REG_WWLO 0x0009
+#define BT431_REG_WWHI 0x000a
+#define BT431_REG_WHLO 0x000b
+#define BT431_REG_WHHI 0x000c
+
+#define BT431_REG_CRAM_BASE 0x0000
+#define BT431_REG_CRAM_END 0x01ff
+
+/*
+ * Command register.
+ */
+#define BT431_CMD_CURS_ENABLE 0x40
+#define BT431_CMD_XHAIR_ENABLE 0x20
+#define BT431_CMD_OR_CURSORS 0x10
+#define BT431_CMD_AND_CURSORS 0x00
+#define BT431_CMD_1_1_MUX 0x00
+#define BT431_CMD_4_1_MUX 0x04
+#define BT431_CMD_5_1_MUX 0x08
+#define BT431_CMD_xxx_MUX 0x0c
+#define BT431_CMD_THICK_1 0x00
+#define BT431_CMD_THICK_3 0x01
+#define BT431_CMD_THICK_5 0x02
+#define BT431_CMD_THICK_7 0x03
+
+static inline void bt431_select_reg(struct bt431_regs *regs, int ir)
+{
+ /*
+ * The compiler splits the write in two bytes without these
+ * helper variables.
+ */
+ volatile u16 *lo = &(regs->addr_lo);
+ volatile u16 *hi = &(regs->addr_hi);
+
+ mb();
+ *lo = bt431_set_value(ir & 0xff);
+ wmb();
+ *hi = bt431_set_value((ir >> 8) & 0xff);
+}
+
+/* Autoincrement read/write. */
+static inline u8 bt431_read_reg_inc(struct bt431_regs *regs)
+{
+ /*
+ * The compiler splits the write in two bytes without the
+ * helper variable.
+ */
+ volatile u16 *r = &(regs->addr_reg);
+
+ mb();
+ return bt431_get_value(*r);
+}
+
+static inline void bt431_write_reg_inc(struct bt431_regs *regs, u8 value)
+{
+ /*
+ * The compiler splits the write in two bytes without the
+ * helper variable.
+ */
+ volatile u16 *r = &(regs->addr_reg);
+
+ mb();
+ *r = bt431_set_value(value);
+}
+
+static inline u8 bt431_read_reg(struct bt431_regs *regs, int ir)
+{
+ bt431_select_reg(regs, ir);
+ return bt431_read_reg_inc(regs);
+}
+
+static inline void bt431_write_reg(struct bt431_regs *regs, int ir, u8 value)
+{
+ bt431_select_reg(regs, ir);
+ bt431_write_reg_inc(regs, value);
+}
+
+/* Autoincremented read/write for the cursor map. */
+static inline u16 bt431_read_cmap_inc(struct bt431_regs *regs)
+{
+ /*
+ * The compiler splits the write in two bytes without the
+ * helper variable.
+ */
+ volatile u16 *r = &(regs->addr_cmap);
+
+ mb();
+ return *r;
+}
+
+static inline void bt431_write_cmap_inc(struct bt431_regs *regs, u16 value)
+{
+ /*
+ * The compiler splits the write in two bytes without the
+ * helper variable.
+ */
+ volatile u16 *r = &(regs->addr_cmap);
+
+ mb();
+ *r = value;
+}
+
+static inline u16 bt431_read_cmap(struct bt431_regs *regs, int cr)
+{
+ bt431_select_reg(regs, cr);
+ return bt431_read_cmap_inc(regs);
+}
+
+static inline void bt431_write_cmap(struct bt431_regs *regs, int cr, u16 value)
+{
+ bt431_select_reg(regs, cr);
+ bt431_write_cmap_inc(regs, value);
+}
+
+static inline void bt431_enable_cursor(struct bt431_regs *regs)
+{
+ bt431_write_reg(regs, BT431_REG_CMD,
+ BT431_CMD_CURS_ENABLE | BT431_CMD_OR_CURSORS
+ | BT431_CMD_4_1_MUX | BT431_CMD_THICK_1);
+}
+
+static inline void bt431_erase_cursor(struct bt431_regs *regs)
+{
+ bt431_write_reg(regs, BT431_REG_CMD, BT431_CMD_4_1_MUX);
+}
+
+static inline void bt431_position_cursor(struct bt431_regs *regs, u16 x, u16 y)
+{
+ /*
+ * Magic from the MACH sources.
+ *
+ * Cx = x + D + H - P
+ * P = 37 if 1:1, 52 if 4:1, 57 if 5:1
+ * D = pixel skew between outdata and external data
+ * H = pixels between HSYNCH falling and active video
+ *
+ * Cy = y + V - 32
+ * V = scanlines between HSYNCH falling, two or more
+ * clocks after VSYNCH falling, and active video
+ */
+ x += 412 - 52;
+ y += 68 - 32;
+
+ /* Use autoincrement. */
+ bt431_select_reg(regs, BT431_REG_CXLO);
+ bt431_write_reg_inc(regs, x & 0xff); /* BT431_REG_CXLO */
+ bt431_write_reg_inc(regs, (x >> 8) & 0x0f); /* BT431_REG_CXHI */
+ bt431_write_reg_inc(regs, y & 0xff); /* BT431_REG_CYLO */
+ bt431_write_reg_inc(regs, (y >> 8) & 0x0f); /* BT431_REG_CYHI */
+}
+
+static inline void bt431_set_font(struct bt431_regs *regs, u8 fgc,
+ u16 width, u16 height)
+{
+ int i;
+ u16 fgp = fgc ? 0xffff : 0x0000;
+ u16 bgp = fgc ? 0x0000 : 0xffff;
+
+ bt431_select_reg(regs, BT431_REG_CRAM_BASE);
+ for (i = BT431_REG_CRAM_BASE; i <= BT431_REG_CRAM_END; i++) {
+ u16 value;
+
+ if (height << 6 <= i << 3)
+ value = bgp;
+ else if (width <= i % 8 << 3)
+ value = bgp;
+ else if (((width >> 3) & 0xffff) > i % 8)
+ value = fgp;
+ else
+ value = fgp & ~(bgp << (width % 8 << 1));
+
+ bt431_write_cmap_inc(regs, value);
+ }
+}
+
+static inline void bt431_init_cursor(struct bt431_regs *regs)
+{
+ /* no crosshair window */
+ bt431_select_reg(regs, BT431_REG_WXLO);
+ bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXLO */
+ bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXHI */
+ bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYLO */
+ bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYHI */
+ bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWLO */
+ bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWHI */
+ bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHLO */
+ bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHHI */
+}
Code Review / kvmfornfv.git / blobdiff