linux/drivers/gpu/drm/nouveau/nouveau_hwsq.h

/*
 * Copyright 2010 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#ifndef __NOUVEAU_HWSQ_H__
#define __NOUVEAU_HWSQ_H__

struct hwsq_ucode {
	u8 data[0x200];
	union {
		u8  *u08;
		u16 *u16;
		u32 *u32;
	} ptr;
	u16 len;

	u32 reg;
	u32 val;
};

static inline void
hwsq_init(struct hwsq_ucode *hwsq)
{
	hwsq->ptr.u08 = hwsq->data;
	hwsq->reg = 0xffffffff;
	hwsq->val = 0xffffffff;
}

static inline void
hwsq_fini(struct hwsq_ucode *hwsq)
{
	do {
		*hwsq->ptr.u08++ = 0x7f;
		hwsq->len = hwsq->ptr.u08 - hwsq->data;
	} while (hwsq->len & 3);
	hwsq->ptr.u08 = hwsq->data;
}

static inline void
hwsq_usec(struct hwsq_ucode *hwsq, u8 usec)
{
	u32 shift = 0;
	while (usec & ~3) {
		usec >>= 2;
		shift++;
	}

	*hwsq->ptr.u08++ = (shift << 2) | usec;
}

static inline void
hwsq_setf(struct hwsq_ucode *hwsq, u8 flag, int val)
{
	flag += 0x80;
	if (val >= 0)
		flag += 0x20;
	if (val >= 1)
		flag += 0x20;
	*hwsq->ptr.u08++ = flag;
}

static inline void
hwsq_op5f(struct hwsq_ucode *hwsq, u8 v0, u8 v1)
{
	*hwsq->ptr.u08++ = 0x5f;
	*hwsq->ptr.u08++ = v0;
	*hwsq->ptr.u08++ = v1;
}

static inline void
hwsq_wr32(struct hwsq_ucode *hwsq, u32 reg, u32 val)
{
	if (val != hwsq->val) {
		if ((val & 0xffff0000) == (hwsq->val & 0xffff0000)) {
			*hwsq->ptr.u08++ = 0x42;
			*hwsq->ptr.u16++ = (val & 0x0000ffff);
		} else {
			*hwsq->ptr.u08++ = 0xe2;
			*hwsq->ptr.u32++ = val;
		}

		hwsq->val = val;
	}

	if ((reg & 0xffff0000) == (hwsq->reg & 0xffff0000)) {
		*hwsq->ptr.u08++ = 0x40;
		*hwsq->ptr.u16++ = (reg & 0x0000ffff);
	} else {
		*hwsq->ptr.u08++ = 0xe0;
		*hwsq->ptr.u32++ = reg;
	}
	hwsq->reg = reg;
}

#endif