/*
 * Copyright 2012 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.
 */

#include <engine/falcon.h>
#include <subdev/timer.h>

void
nouveau_falcon_intr(struct nouveau_subdev *subdev)
{
	struct nouveau_falcon *falcon = (void *)subdev;
	u32 dispatch = nv_ro32(falcon, 0x01c);
	u32 intr = nv_ro32(falcon, 0x008) & dispatch & ~(dispatch >> 16);

	if (intr & 0x00000010) {
		nv_debug(falcon, "ucode halted\n");
		nv_wo32(falcon, 0x004, 0x00000010);
		intr &= ~0x00000010;
	}

	if (intr)  {
		nv_error(falcon, "unhandled intr 0x%08x\n", intr);
		nv_wo32(falcon, 0x004, intr);
	}
}

u32
_nouveau_falcon_rd32(struct nouveau_object *object, u64 addr)
{
	struct nouveau_falcon *falcon = (void *)object;
	return nv_rd32(falcon, falcon->addr + addr);
}

void
_nouveau_falcon_wr32(struct nouveau_object *object, u64 addr, u32 data)
{
	struct nouveau_falcon *falcon = (void *)object;
	nv_wr32(falcon, falcon->addr + addr, data);
}

int
_nouveau_falcon_init(struct nouveau_object *object)
{
	struct nouveau_device *device = nv_device(object);
	struct nouveau_falcon *falcon = (void *)object;
	const struct firmware *fw;
	char name[32] = "internal";
	int ret, i;
	u32 caps;

	/* enable engine, and determine its capabilities */
	ret = nouveau_engine_init(&falcon->base);
	if (ret)
		return ret;

	if (device->chipset <  0xa3 ||
	    device->chipset == 0xaa || device->chipset == 0xac) {
		falcon->version = 0;
		falcon->secret  = (falcon->addr == 0x087000) ? 1 : 0;
	} else {
		caps = nv_ro32(falcon, 0x12c);
		falcon->version = (caps & 0x0000000f);
		falcon->secret  = (caps & 0x00000030) >> 4;
	}

	caps = nv_ro32(falcon, 0x108);
	falcon->code.limit = (caps & 0x000001ff) << 8;
	falcon->data.limit = (caps & 0x0003fe00) >> 1;

	nv_debug(falcon, "falcon version: %d\n", falcon->version);
	nv_debug(falcon, "secret level: %d\n", falcon->secret);
	nv_debug(falcon, "code limit: %d\n", falcon->code.limit);
	nv_debug(falcon, "data limit: %d\n", falcon->data.limit);

	/* wait for 'uc halted' to be signalled before continuing */
	if (falcon->secret && falcon->version < 4) {
		if (!falcon->version)
			nv_wait(falcon, 0x008, 0x00000010, 0x00000010);
		else
			nv_wait(falcon, 0x180, 0x80000000, 0);
		nv_wo32(falcon, 0x004, 0x00000010);
	}

	/* disable all interrupts */
	nv_wo32(falcon, 0x014, 0xffffffff);

	/* no default ucode provided by the engine implementation, try and
	 * locate a "self-bootstrapping" firmware image for the engine
	 */
	if (!falcon->code.data) {
		snprintf(name, sizeof(name), "nouveau/nv%02x_fuc%03x",
			 device->chipset, falcon->addr >> 12);

		ret = request_firmware(&fw, name, &device->pdev->dev);
		if (ret == 0) {
			falcon->code.data = kmemdup(fw->data, fw->size, GFP_KERNEL);
			falcon->code.size = fw->size;
			falcon->data.data = NULL;
			falcon->data.size = 0;
			release_firmware(fw);
		}

		falcon->external = true;
	}

	/* next step is to try and load "static code/data segment" firmware
	 * images for the engine
	 */
	if (!falcon->code.data) {
		snprintf(name, sizeof(name), "nouveau/nv%02x_fuc%03xd",
			 device->chipset, falcon->addr >> 12);

		ret = request_firmware(&fw, name, &device->pdev->dev);
		if (ret) {
			nv_error(falcon, "unable to load firmware data\n");
			return ret;
		}

		falcon->data.data = kmemdup(fw->data, fw->size, GFP_KERNEL);
		falcon->data.size = fw->size;
		release_firmware(fw);
		if (!falcon->data.data)
			return -ENOMEM;

		snprintf(name, sizeof(name), "nouveau/nv%02x_fuc%03xc",
			 device->chipset, falcon->addr >> 12);

		ret = request_firmware(&fw, name, &device->pdev->dev);
		if (ret) {
			nv_error(falcon, "unable to load firmware code\n");
			return ret;
		}

		falcon->code.data = kmemdup(fw->data, fw->size, GFP_KERNEL);
		falcon->code.size = fw->size;
		release_firmware(fw);
		if (!falcon->code.data)
			return -ENOMEM;
	}

	nv_debug(falcon, "firmware: %s (%s)\n", name, falcon->data.data ?
		 "static code/data segments" : "self-bootstrapping");

	/* ensure any "self-bootstrapping" firmware image is in vram */
	if (!falcon->data.data && !falcon->core) {
		ret = nouveau_gpuobj_new(object->parent, NULL,
					 falcon->code.size, 256, 0,
					&falcon->core);
		if (ret) {
			nv_error(falcon, "core allocation failed, %d\n", ret);
			return ret;
		}

		for (i = 0; i < falcon->code.size; i += 4)
			nv_wo32(falcon->core, i, falcon->code.data[i / 4]);
	}

	/* upload firmware bootloader (or the full code segments) */
	if (falcon->core) {
		if (device->card_type < NV_C0)
			nv_wo32(falcon, 0x618, 0x04000000);
		else
			nv_wo32(falcon, 0x618, 0x00000114);
		nv_wo32(falcon, 0x11c, 0);
		nv_wo32(falcon, 0x110, falcon->core->addr >> 8);
		nv_wo32(falcon, 0x114, 0);
		nv_wo32(falcon, 0x118, 0x00006610);
	} else {
		if (falcon->code.size > falcon->code.limit ||
		    falcon->data.size > falcon->data.limit) {
			nv_error(falcon, "ucode exceeds falcon limit(s)\n");
			return -EINVAL;
		}

		if (falcon->version < 3) {
			nv_wo32(falcon, 0xff8, 0x00100000);
			for (i = 0; i < falcon->code.size / 4; i++)
				nv_wo32(falcon, 0xff4, falcon->code.data[i]);
		} else {
			nv_wo32(falcon, 0x180, 0x01000000);
			for (i = 0; i < falcon->code.size / 4; i++) {
				if ((i & 0x3f) == 0)
					nv_wo32(falcon, 0x188, i >> 6);
				nv_wo32(falcon, 0x184, falcon->code.data[i]);
			}
		}
	}

	/* upload data segment (if necessary), zeroing the remainder */
	if (falcon->version < 3) {
		nv_wo32(falcon, 0xff8, 0x00000000);
		for (i = 0; !falcon->core && i < falcon->data.size / 4; i++)
			nv_wo32(falcon, 0xff4, falcon->data.data[i]);
		for (; i < falcon->data.limit; i += 4)
			nv_wo32(falcon, 0xff4, 0x00000000);
	} else {
		nv_wo32(falcon, 0x1c0, 0x01000000);
		for (i = 0; !falcon->core && i < falcon->data.size / 4; i++)
			nv_wo32(falcon, 0x1c4, falcon->data.data[i]);
		for (; i < falcon->data.limit / 4; i++)
			nv_wo32(falcon, 0x1c4, 0x00000000);
	}

	/* start it running */
	nv_wo32(falcon, 0x10c, 0x00000001); /* BLOCK_ON_FIFO */
	nv_wo32(falcon, 0x104, 0x00000000); /* ENTRY */
	nv_wo32(falcon, 0x100, 0x00000002); /* TRIGGER */
	nv_wo32(falcon, 0x048, 0x00000003); /* FIFO | CHSW */
	return 0;
}

int
_nouveau_falcon_fini(struct nouveau_object *object, bool suspend)
{
	struct nouveau_falcon *falcon = (void *)object;

	if (!suspend) {
		nouveau_gpuobj_ref(NULL, &falcon->core);
		if (falcon->external) {
			kfree(falcon->data.data);
			kfree(falcon->code.data);
			falcon->code.data = NULL;
		}
	}

	nv_mo32(falcon, 0x048, 0x00000003, 0x00000000);
	nv_wo32(falcon, 0x014, 0xffffffff);

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

int
nouveau_falcon_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_falcon *falcon;
	int ret;

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

	falcon->addr = addr;
	return 0;
}