Release 4.11 drivers/video/fbdev/bt431.h

/*
 *      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;
}

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static inline u8 bt431_get_value(u16 val)
{
	return val & 0xff;
}

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/*
 * 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);
}

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/* 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);
}

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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);
}

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static inline u8 bt431_read_reg(struct bt431_regs *regs, int ir)
{
	bt431_select_reg(regs, ir);
	return bt431_read_reg_inc(regs);
}

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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);
}

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/* 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;
}

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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;
}

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static inline u16 bt431_read_cmap(struct bt431_regs *regs, int cr)
{
	bt431_select_reg(regs, cr);
	return bt431_read_cmap_inc(regs);
}

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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);
}

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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);
}

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static inline void bt431_erase_cursor(struct bt431_regs *regs)
{
	bt431_write_reg(regs, BT431_REG_CMD, BT431_CMD_4_1_MUX);
}

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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 */
}

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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);
		}
}

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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 */
}
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Directory: drivers/video/fbdev

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