/* *	linux/drivers/video/bt431.h * *	Copyright 2003  Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de> *	Copyright 2016  Maciej W. Rozycki <macro@linux-mips.org> * *	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> #define BT431_CURSOR_SIZE	64 /* * 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_XOR_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_cursor(struct bt431_regs *regs,				    const char *data, const char *mask,				    u16 rop, u16 width, u16 height){	u16 x, y;	int i; 	i = 0;	width = DIV_ROUND_UP(width, 8);	bt431_select_reg(regs, BT431_REG_CRAM_BASE);	for (y = 0; y < BT431_CURSOR_SIZE; y++)		for (x = 0; x < BT431_CURSOR_SIZE / 8; x++) {			u16 val = 0; 			if (y < height && x < width) {				val = mask[i];				if (rop == ROP_XOR)					val = (val << 8) | (val ^ data[i]);				else					val = (val << 8) | (val & data[i]);				i++;			}			bt431_write_cmap_inc(regs, val);		}} 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 */}