/*
 * 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
 */

#include "drmP.h"

#include "nouveau_drv.h"
#include "nouveau_vm.h"

struct nvc0_instmem_priv {
	struct nouveau_gpuobj  *bar1_pgd;
	struct nouveau_channel *bar1;
	struct nouveau_gpuobj  *bar3_pgd;
	struct nouveau_channel *bar3;
	struct nouveau_gpuobj  *chan_pgd;
};

int
nvc0_instmem_suspend(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	dev_priv->ramin_available = false;
	return 0;
}

void
nvc0_instmem_resume(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nvc0_instmem_priv *priv = dev_priv->engine.instmem.priv;

	nv_mask(dev, 0x100c80, 0x00000001, 0x00000000);
	nv_wr32(dev, 0x001704, 0x80000000 | priv->bar1->ramin->vinst >> 12);
	nv_wr32(dev, 0x001714, 0xc0000000 | priv->bar3->ramin->vinst >> 12);
	dev_priv->ramin_available = true;
}

static void
nvc0_channel_del(struct nouveau_channel **pchan)
{
	struct nouveau_channel *chan;

	chan = *pchan;
	*pchan = NULL;
	if (!chan)
		return;

	nouveau_vm_ref(NULL, &chan->vm, NULL);
	if (drm_mm_initialized(&chan->ramin_heap))
		drm_mm_takedown(&chan->ramin_heap);
	nouveau_gpuobj_ref(NULL, &chan->ramin);
	kfree(chan);
}

static int
nvc0_channel_new(struct drm_device *dev, u32 size, struct nouveau_vm *vm,
		 struct nouveau_channel **pchan,
		 struct nouveau_gpuobj *pgd, u64 vm_size)
{
	struct nouveau_channel *chan;
	int ret;

	chan = kzalloc(sizeof(*chan), GFP_KERNEL);
	if (!chan)
		return -ENOMEM;
	chan->dev = dev;

	ret = nouveau_gpuobj_new(dev, NULL, size, 0x1000, 0, &chan->ramin);
	if (ret) {
		nvc0_channel_del(&chan);
		return ret;
	}

	ret = drm_mm_init(&chan->ramin_heap, 0x1000, size - 0x1000);
	if (ret) {
		nvc0_channel_del(&chan);
		return ret;
	}

	ret = nouveau_vm_ref(vm, &chan->vm, NULL);
	if (ret) {
		nvc0_channel_del(&chan);
		return ret;
	}

	nv_wo32(chan->ramin, 0x0200, lower_32_bits(pgd->vinst));
	nv_wo32(chan->ramin, 0x0204, upper_32_bits(pgd->vinst));
	nv_wo32(chan->ramin, 0x0208, lower_32_bits(vm_size - 1));
	nv_wo32(chan->ramin, 0x020c, upper_32_bits(vm_size - 1));

	*pchan = chan;
	return 0;
}

int
nvc0_instmem_init(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_instmem_engine *pinstmem = &dev_priv->engine.instmem;
	struct pci_dev *pdev = dev->pdev;
	struct nvc0_instmem_priv *priv;
	struct nouveau_vm *vm = NULL;
	int ret;

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

	/* BAR3 VM */
	ret = nouveau_vm_new(dev, 0, pci_resource_len(pdev, 3), 0,
			     &dev_priv->bar3_vm);
	if (ret)
		goto error;

	ret = nouveau_gpuobj_new(dev, NULL,
				 (pci_resource_len(pdev, 3) >> 12) * 8, 0,
				 NVOBJ_FLAG_DONT_MAP |
				 NVOBJ_FLAG_ZERO_ALLOC,
				 &dev_priv->bar3_vm->pgt[0].obj[0]);
	if (ret)
		goto error;
	dev_priv->bar3_vm->pgt[0].refcount[0] = 1;

	nv50_instmem_map(dev_priv->bar3_vm->pgt[0].obj[0]);

	ret = nouveau_gpuobj_new(dev, NULL, 0x8000, 4096,
				 NVOBJ_FLAG_ZERO_ALLOC, &priv->bar3_pgd);
	if (ret)
		goto error;

	ret = nouveau_vm_ref(dev_priv->bar3_vm, &vm, priv->bar3_pgd);
	if (ret)
		goto error;
	nouveau_vm_ref(NULL, &vm, NULL);

	ret = nvc0_channel_new(dev, 8192, dev_priv->bar3_vm, &priv->bar3,
			       priv->bar3_pgd, pci_resource_len(dev->pdev, 3));
	if (ret)
		goto error;

	/* BAR1 VM */
	ret = nouveau_vm_new(dev, 0, pci_resource_len(pdev, 1), 0, &vm);
	if (ret)
		goto error;

	ret = nouveau_gpuobj_new(dev, NULL, 0x8000, 4096,
				 NVOBJ_FLAG_ZERO_ALLOC, &priv->bar1_pgd);
	if (ret)
		goto error;

	ret = nouveau_vm_ref(vm, &dev_priv->bar1_vm, priv->bar1_pgd);
	if (ret)
		goto error;
	nouveau_vm_ref(NULL, &vm, NULL);

	ret = nvc0_channel_new(dev, 8192, dev_priv->bar1_vm, &priv->bar1,
			       priv->bar1_pgd, pci_resource_len(dev->pdev, 1));
	if (ret)
		goto error;

	/* channel vm */
	ret = nouveau_vm_new(dev, 0, (1ULL << 40), 0x0008000000ULL, &vm);
	if (ret)
		goto error;

	ret = nouveau_gpuobj_new(dev, NULL, 0x8000, 4096, 0, &priv->chan_pgd);
	if (ret)
		goto error;

	nouveau_vm_ref(vm, &dev_priv->chan_vm, priv->chan_pgd);
	nouveau_vm_ref(NULL, &vm, NULL);

	nvc0_instmem_resume(dev);
	return 0;
error:
	nvc0_instmem_takedown(dev);
	return ret;
}

void
nvc0_instmem_takedown(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nvc0_instmem_priv *priv = dev_priv->engine.instmem.priv;
	struct nouveau_vm *vm = NULL;

	nvc0_instmem_suspend(dev);

	nv_wr32(dev, 0x1704, 0x00000000);
	nv_wr32(dev, 0x1714, 0x00000000);

	nouveau_vm_ref(NULL, &dev_priv->chan_vm, priv->chan_pgd);
	nouveau_gpuobj_ref(NULL, &priv->chan_pgd);

	nvc0_channel_del(&priv->bar1);
	nouveau_vm_ref(NULL, &dev_priv->bar1_vm, priv->bar1_pgd);
	nouveau_gpuobj_ref(NULL, &priv->bar1_pgd);

	nvc0_channel_del(&priv->bar3);
	nouveau_vm_ref(dev_priv->bar3_vm, &vm, NULL);
	nouveau_vm_ref(NULL, &vm, priv->bar3_pgd);
	nouveau_gpuobj_ref(NULL, &priv->bar3_pgd);
	nouveau_gpuobj_ref(NULL, &dev_priv->bar3_vm->pgt[0].obj[0]);
	nouveau_vm_ref(NULL, &dev_priv->bar3_vm, NULL);

	dev_priv->engine.instmem.priv = NULL;
	kfree(priv);
}