/*
 * Copyright 2011 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
 */

#include "drmP.h"

#include "nouveau_drv.h"
#include "nouveau_util.h"
#include "nouveau_vm.h"
#include "nouveau_ramht.h"

#include "nv98_crypt.fuc.h"

struct nv98_crypt_priv {
	struct nouveau_exec_engine base;
};

struct nv98_crypt_chan {
	struct nouveau_gpuobj *mem;
};

static int
nv98_crypt_context_new(struct nouveau_channel *chan, int engine)
{
	struct drm_device *dev = chan->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nv98_crypt_priv *priv = nv_engine(dev, engine);
	struct nv98_crypt_chan *cctx;
	int ret;

	cctx = chan->engctx[engine] = kzalloc(sizeof(*cctx), GFP_KERNEL);
	if (!cctx)
		return -ENOMEM;

	atomic_inc(&chan->vm->engref[engine]);

	ret = nouveau_gpuobj_new(dev, chan, 256, 0, NVOBJ_FLAG_ZERO_ALLOC |
				 NVOBJ_FLAG_ZERO_FREE, &cctx->mem);
	if (ret)
		goto error;

	nv_wo32(chan->ramin, 0xa0, 0x00190000);
	nv_wo32(chan->ramin, 0xa4, cctx->mem->vinst + cctx->mem->size - 1);
	nv_wo32(chan->ramin, 0xa8, cctx->mem->vinst);
	nv_wo32(chan->ramin, 0xac, 0x00000000);
	nv_wo32(chan->ramin, 0xb0, 0x00000000);
	nv_wo32(chan->ramin, 0xb4, 0x00000000);
	dev_priv->engine.instmem.flush(dev);

error:
	if (ret)
		priv->base.context_del(chan, engine);
	return ret;
}

static void
nv98_crypt_context_del(struct nouveau_channel *chan, int engine)
{
	struct nv98_crypt_chan *cctx = chan->engctx[engine];
	int i;

	for (i = 0xa0; i < 0xb4; i += 4)
		nv_wo32(chan->ramin, i, 0x00000000);

	nouveau_gpuobj_ref(NULL, &cctx->mem);

	atomic_dec(&chan->vm->engref[engine]);
	chan->engctx[engine] = NULL;
	kfree(cctx);
}

static int
nv98_crypt_object_new(struct nouveau_channel *chan, int engine,
		     u32 handle, u16 class)
{
	struct nv98_crypt_chan *cctx = chan->engctx[engine];

	/* fuc engine doesn't need an object, our ramht code does.. */
	cctx->mem->engine = 5;
	cctx->mem->class  = class;
	return nouveau_ramht_insert(chan, handle, cctx->mem);
}

static void
nv98_crypt_tlb_flush(struct drm_device *dev, int engine)
{
	nv50_vm_flush_engine(dev, 0x0a);
}

static int
nv98_crypt_fini(struct drm_device *dev, int engine, bool suspend)
{
	nv_mask(dev, 0x000200, 0x00004000, 0x00000000);
	return 0;
}

static int
nv98_crypt_init(struct drm_device *dev, int engine)
{
	int i;

	/* reset! */
	nv_mask(dev, 0x000200, 0x00004000, 0x00000000);
	nv_mask(dev, 0x000200, 0x00004000, 0x00004000);

	/* wait for exit interrupt to signal */
	nv_wait(dev, 0x087008, 0x00000010, 0x00000010);
	nv_wr32(dev, 0x087004, 0x00000010);

	/* upload microcode code and data segments */
	nv_wr32(dev, 0x087ff8, 0x00100000);
	for (i = 0; i < ARRAY_SIZE(nv98_pcrypt_code); i++)
		nv_wr32(dev, 0x087ff4, nv98_pcrypt_code[i]);

	nv_wr32(dev, 0x087ff8, 0x00000000);
	for (i = 0; i < ARRAY_SIZE(nv98_pcrypt_data); i++)
		nv_wr32(dev, 0x087ff4, nv98_pcrypt_data[i]);

	/* start it running */
	nv_wr32(dev, 0x08710c, 0x00000000);
	nv_wr32(dev, 0x087104, 0x00000000); /* ENTRY */
	nv_wr32(dev, 0x087100, 0x00000002); /* TRIGGER */
	return 0;
}

static struct nouveau_enum nv98_crypt_isr_error_name[] = {
	{ 0x0000, "ILLEGAL_MTHD" },
	{ 0x0001, "INVALID_BITFIELD" },
	{ 0x0002, "INVALID_ENUM" },
	{ 0x0003, "QUERY" },
	{}
};

static void
nv98_crypt_isr(struct drm_device *dev)
{
	u32 disp = nv_rd32(dev, 0x08701c);
	u32 stat = nv_rd32(dev, 0x087008) & disp & ~(disp >> 16);
	u32 inst = nv_rd32(dev, 0x087050) & 0x3fffffff;
	u32 ssta = nv_rd32(dev, 0x087040) & 0x0000ffff;
	u32 addr = nv_rd32(dev, 0x087040) >> 16;
	u32 mthd = (addr & 0x07ff) << 2;
	u32 subc = (addr & 0x3800) >> 11;
	u32 data = nv_rd32(dev, 0x087044);
	int chid = nv50_graph_isr_chid(dev, inst);

	if (stat & 0x00000040) {
		NV_INFO(dev, "PCRYPT: DISPATCH_ERROR [");
		nouveau_enum_print(nv98_crypt_isr_error_name, ssta);
		printk("] ch %d [0x%08x] subc %d mthd 0x%04x data 0x%08x\n",
			chid, inst, subc, mthd, data);
		nv_wr32(dev, 0x087004, 0x00000040);
		stat &= ~0x00000040;
	}

	if (stat) {
		NV_INFO(dev, "PCRYPT: unhandled intr 0x%08x\n", stat);
		nv_wr32(dev, 0x087004, stat);
	}

	nv50_fb_vm_trap(dev, 1);
}

static void
nv98_crypt_destroy(struct drm_device *dev, int engine)
{
	struct nv98_crypt_priv *priv = nv_engine(dev, engine);

	nouveau_irq_unregister(dev, 14);
	NVOBJ_ENGINE_DEL(dev, CRYPT);
	kfree(priv);
}

int
nv98_crypt_create(struct drm_device *dev)
{
	struct nv98_crypt_priv *priv;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->base.destroy = nv98_crypt_destroy;
	priv->base.init = nv98_crypt_init;
	priv->base.fini = nv98_crypt_fini;
	priv->base.context_new = nv98_crypt_context_new;
	priv->base.context_del = nv98_crypt_context_del;
	priv->base.object_new = nv98_crypt_object_new;
	priv->base.tlb_flush = nv98_crypt_tlb_flush;

	nouveau_irq_register(dev, 14, nv98_crypt_isr);

	NVOBJ_ENGINE_ADD(dev, CRYPT, &priv->base);
	NVOBJ_CLASS(dev, 0x88b4, CRYPT);
	return 0;
}