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/*
* Copyright (C) 2007 Ben Skeggs.
* All Rights Reserved.
*
* 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 (including the
* next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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 "drmP.h"
#include "drm.h"
#include "nouveau_drv.h"
#include "nouveau_dma.h"
#define SKIPS 8
int
nouveau_dma_channel_init(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_drm_channel *dchan = &dev_priv->channel;
struct nouveau_gpuobj *gpuobj = NULL;
struct mem_block *pushbuf;
int grclass, ret, i;
DRM_DEBUG("\n");
pushbuf = nouveau_mem_alloc(dev, 0, 0x8000,
NOUVEAU_MEM_FB | NOUVEAU_MEM_MAPPED,
(struct drm_file *)-2);
if (!pushbuf) {
DRM_ERROR("Failed to allocate DMA push buffer\n");
return -ENOMEM;
}
/* Allocate channel */
ret = nouveau_fifo_alloc(dev, &dchan->chan, (struct drm_file *)-2,
pushbuf, NvDmaFB, NvDmaTT);
if (ret) {
DRM_ERROR("Error allocating GPU channel: %d\n", ret);
return ret;
}
DRM_DEBUG("Using FIFO channel %d\n", dchan->chan->id);
/* Map push buffer */
drm_core_ioremap(dchan->chan->pushbuf_mem->map, dev);
if (!dchan->chan->pushbuf_mem->map->handle) {
DRM_ERROR("Failed to ioremap push buffer\n");
return -EINVAL;
}
dchan->pushbuf = (void*)dchan->chan->pushbuf_mem->map->handle;
/* Initialise DMA vars */
dchan->max = (dchan->chan->pushbuf_mem->size >> 2) - 2;
dchan->put = dchan->chan->pushbuf_base >> 2;
dchan->cur = dchan->put;
dchan->free = dchan->max - dchan->cur;
/* Insert NOPS for SKIPS */
dchan->free -= SKIPS;
dchan->push_free = SKIPS;
for (i=0; i<SKIPS; i++)
OUT_RING(0);
/* NV_MEMORY_TO_MEMORY_FORMAT requires a notifier */
if ((ret = nouveau_notifier_alloc(dchan->chan, NvNotify0, 1,
&dchan->notify0_offset))) {
DRM_ERROR("Error allocating NvNotify0: %d\n", ret);
return ret;
}
/* We use NV_MEMORY_TO_MEMORY_FORMAT for buffer moves */
if (dev_priv->card_type < NV_50) grclass = NV_MEMORY_TO_MEMORY_FORMAT;
else grclass = NV50_MEMORY_TO_MEMORY_FORMAT;
if ((ret = nouveau_gpuobj_gr_new(dchan->chan, grclass, &gpuobj))) {
DRM_ERROR("Error creating NvM2MF: %d\n", ret);
return ret;
}
if ((ret = nouveau_gpuobj_ref_add(dev, dchan->chan, NvM2MF,
gpuobj, NULL))) {
DRM_ERROR("Error referencing NvM2MF: %d\n", ret);
return ret;
}
dchan->m2mf_dma_source = NvDmaFB;
dchan->m2mf_dma_destin = NvDmaFB;
BEGIN_RING(NvSubM2MF, NV_MEMORY_TO_MEMORY_FORMAT_NAME, 1);
OUT_RING (NvM2MF);
BEGIN_RING(NvSubM2MF, NV_MEMORY_TO_MEMORY_FORMAT_SET_DMA_NOTIFY, 1);
OUT_RING (NvNotify0);
BEGIN_RING(NvSubM2MF, NV_MEMORY_TO_MEMORY_FORMAT_SET_DMA_SOURCE, 2);
OUT_RING (dchan->m2mf_dma_source);
OUT_RING (dchan->m2mf_dma_destin);
FIRE_RING();
return 0;
}
void
nouveau_dma_channel_takedown(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_drm_channel *dchan = &dev_priv->channel;
DRM_DEBUG("\n");
if (dchan->chan) {
nouveau_fifo_free(dchan->chan);
dchan->chan = NULL;
}
}
#define RING_SKIPS 8
#define READ_GET() ((NV_READ(NV03_FIFO_REGS_DMAGET(dchan->chan->id)) - \
dchan->chan->pushbuf_base) >> 2)
#define WRITE_PUT(val) do { \
NV_WRITE(NV03_FIFO_REGS_DMAPUT(dchan->chan->id), \
((val) << 2) + dchan->chan->pushbuf_base); \
} while(0)
int
nouveau_dma_wait(struct drm_device *dev, int size)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_drm_channel *dchan = &dev_priv->channel;
uint32_t get;
while (dchan->free < size) {
get = READ_GET();
if (dchan->put >= get) {
dchan->free = dchan->max - dchan->cur;
if (dchan->free < size) {
dchan->push_free = 1;
OUT_RING(0x20000000|dchan->chan->pushbuf_base);
if (get <= RING_SKIPS) {
/*corner case - will be idle*/
if (dchan->put <= RING_SKIPS)
WRITE_PUT(RING_SKIPS + 1);
do {
get = READ_GET();
} while (get <= RING_SKIPS);
}
WRITE_PUT(RING_SKIPS);
dchan->cur = dchan->put = RING_SKIPS;
dchan->free = get - (RING_SKIPS + 1);
}
} else {
dchan->free = get - dchan->cur - 1;
}
}
return 0;
}
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