/*
 * Copyright 2013 Ilia Mirkin
 *
 * 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.
 */

#include <engine/xtensa.h>

u32
_nouveau_xtensa_rd32(struct nouveau_object *object, u64 addr)
{
	struct nouveau_xtensa *xtensa = (void *)object;
	return nv_rd32(xtensa, xtensa->addr + addr);
}

void
_nouveau_xtensa_wr32(struct nouveau_object *object, u64 addr, u32 data)
{
	struct nouveau_xtensa *xtensa = (void *)object;
	nv_wr32(xtensa, xtensa->addr + addr, data);
}

int
_nouveau_xtensa_engctx_ctor(struct nouveau_object *parent,
			    struct nouveau_object *engine,
			    struct nouveau_oclass *oclass, void *data, u32 size,
			    struct nouveau_object **pobject)
{
	struct nouveau_engctx *engctx;
	int ret;

	ret = nouveau_engctx_create(parent, engine, oclass, NULL,
				    0x10000, 0x1000,
				    NVOBJ_FLAG_ZERO_ALLOC, &engctx);
	*pobject = nv_object(engctx);
	return ret;
}

void
_nouveau_xtensa_intr(struct nouveau_subdev *subdev)
{
	struct nouveau_xtensa *xtensa = (void *)subdev;
	u32 unk104 = nv_ro32(xtensa, 0xd04);
	u32 intr = nv_ro32(xtensa, 0xc20);
	u32 chan = nv_ro32(xtensa, 0xc28);
	u32 unk10c = nv_ro32(xtensa, 0xd0c);

	if (intr & 0x10)
		nv_warn(xtensa, "Watchdog interrupt, engine hung.\n");
	nv_wo32(xtensa, 0xc20, intr);
	intr = nv_ro32(xtensa, 0xc20);
	if (unk104 == 0x10001 && unk10c == 0x200 && chan && !intr) {
		nv_debug(xtensa, "Enabling FIFO_CTRL\n");
		nv_mask(xtensa, xtensa->addr + 0xd94, 0, xtensa->fifo_val);
	}
}

int
nouveau_xtensa_create_(struct nouveau_object *parent,
		       struct nouveau_object *engine,
		       struct nouveau_oclass *oclass, u32 addr, bool enable,
		       const char *iname, const char *fname,
		       int length, void **pobject)
{
	struct nouveau_xtensa *xtensa;
	int ret;

	ret = nouveau_engine_create_(parent, engine, oclass, enable, iname,
				     fname, length, pobject);
	xtensa = *pobject;
	if (ret)
		return ret;

	nv_subdev(xtensa)->intr = _nouveau_xtensa_intr;

	xtensa->addr = addr;

	return 0;
}

int
_nouveau_xtensa_init(struct nouveau_object *object)
{
	struct nouveau_device *device = nv_device(object);
	struct nouveau_xtensa *xtensa = (void *)object;
	const struct firmware *fw;
	char name[32];
	int i, ret;
	u32 tmp;

	ret = nouveau_engine_init(&xtensa->base);
	if (ret)
		return ret;

	if (!xtensa->gpu_fw) {
		snprintf(name, sizeof(name), "nouveau/nv84_xuc%03x",
			 xtensa->addr >> 12);

		ret = request_firmware(&fw, name, nv_device_base(device));
		if (ret) {
			nv_warn(xtensa, "unable to load firmware %s\n", name);
			return ret;
		}

		if (fw->size > 0x40000) {
			nv_warn(xtensa, "firmware %s too large\n", name);
			release_firmware(fw);
			return -EINVAL;
		}

		ret = nouveau_gpuobj_new(object, NULL, 0x40000, 0x1000, 0,
					 &xtensa->gpu_fw);
		if (ret) {
			release_firmware(fw);
			return ret;
		}

		nv_debug(xtensa, "Loading firmware to address: 0x%llx\n",
			 xtensa->gpu_fw->addr);

		for (i = 0; i < fw->size / 4; i++)
			nv_wo32(xtensa->gpu_fw, i * 4, *((u32 *)fw->data + i));
		release_firmware(fw);
	}

	nv_wo32(xtensa, 0xd10, 0x1fffffff); /* ?? */
	nv_wo32(xtensa, 0xd08, 0x0fffffff); /* ?? */

	nv_wo32(xtensa, 0xd28, xtensa->unkd28); /* ?? */
	nv_wo32(xtensa, 0xc20, 0x3f); /* INTR */
	nv_wo32(xtensa, 0xd84, 0x3f); /* INTR_EN */

	nv_wo32(xtensa, 0xcc0, xtensa->gpu_fw->addr >> 8); /* XT_REGION_BASE */
	nv_wo32(xtensa, 0xcc4, 0x1c); /* XT_REGION_SETUP */
	nv_wo32(xtensa, 0xcc8, xtensa->gpu_fw->size >> 8); /* XT_REGION_LIMIT */

	tmp = nv_rd32(xtensa, 0x0);
	nv_wo32(xtensa, 0xde0, tmp); /* SCRATCH_H2X */

	nv_wo32(xtensa, 0xce8, 0xf); /* XT_REGION_SETUP */

	nv_wo32(xtensa, 0xc20, 0x3f); /* INTR */
	nv_wo32(xtensa, 0xd84, 0x3f); /* INTR_EN */

	return 0;
}

int
_nouveau_xtensa_fini(struct nouveau_object *object, bool suspend)
{
	struct nouveau_xtensa *xtensa = (void *)object;

	nv_wo32(xtensa, 0xd84, 0); /* INTR_EN */
	nv_wo32(xtensa, 0xd94, 0); /* FIFO_CTRL */

	if (!suspend)
		nouveau_gpuobj_ref(NULL, &xtensa->gpu_fw);

	return nouveau_engine_fini(&xtensa->base, suspend);
}