#ifndef __NVKM_BUS_HWSQ_H__
#define __NVKM_BUS_HWSQ_H__

#include <subdev/bus.h>

struct hwsq {
	struct nouveau_subdev *subdev;
	struct nouveau_hwsq *hwsq;
	int sequence;
};

struct hwsq_reg {
	int sequence;
	bool force;
	u32 addr[2];
	u32 data;
};

static inline struct hwsq_reg
hwsq_reg2(u32 addr1, u32 addr2)
{
	return (struct hwsq_reg) {
		.sequence = 0,
		.force = 0,
		.addr = { addr1, addr2 },
		.data = 0xdeadbeef,
	};
}

static inline struct hwsq_reg
hwsq_reg(u32 addr)
{
	return hwsq_reg2(addr, addr);
}

static inline int
hwsq_init(struct hwsq *ram, struct nouveau_subdev *subdev)
{
	struct nouveau_bus *pbus = nouveau_bus(subdev);
	int ret;

	ret = nouveau_hwsq_init(pbus, &ram->hwsq);
	if (ret)
		return ret;

	ram->sequence++;
	ram->subdev = subdev;
	return 0;
}

static inline int
hwsq_exec(struct hwsq *ram, bool exec)
{
	int ret = 0;
	if (ram->subdev) {
		ret = nouveau_hwsq_fini(&ram->hwsq, exec);
		ram->subdev = NULL;
	}
	return ret;
}

static inline u32
hwsq_rd32(struct hwsq *ram, struct hwsq_reg *reg)
{
	if (reg->sequence != ram->sequence)
		reg->data = nv_rd32(ram->subdev, reg->addr[0]);
	return reg->data;
}

static inline void
hwsq_wr32(struct hwsq *ram, struct hwsq_reg *reg, u32 data)
{
	reg->sequence = ram->sequence;
	reg->data = data;
	if (reg->addr[0] != reg->addr[1])
		nouveau_hwsq_wr32(ram->hwsq, reg->addr[1], reg->data);
	nouveau_hwsq_wr32(ram->hwsq, reg->addr[0], reg->data);
}

static inline void
hwsq_nuke(struct hwsq *ram, struct hwsq_reg *reg)
{
	reg->force = true;
}

static inline u32
hwsq_mask(struct hwsq *ram, struct hwsq_reg *reg, u32 mask, u32 data)
{
	u32 temp = hwsq_rd32(ram, reg);
	if (temp != ((temp & ~mask) | data) || reg->force)
		hwsq_wr32(ram, reg, (temp & ~mask) | data);
	return temp;
}

static inline void
hwsq_setf(struct hwsq *ram, u8 flag, int data)
{
	nouveau_hwsq_setf(ram->hwsq, flag, data);
}

static inline void
hwsq_wait(struct hwsq *ram, u8 flag, u8 data)
{
	nouveau_hwsq_wait(ram->hwsq, flag, data);
}

static inline void
hwsq_nsec(struct hwsq *ram, u32 nsec)
{
	nouveau_hwsq_nsec(ram->hwsq, nsec);
}

#endif