diff options
Diffstat (limited to 'shared-core/nouveau_dma.c')
| -rw-r--r-- | shared-core/nouveau_dma.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/shared-core/nouveau_dma.c b/shared-core/nouveau_dma.c new file mode 100644 index 00000000..ab502e6a --- /dev/null +++ b/shared-core/nouveau_dma.c @@ -0,0 +1,177 @@ +/* + * 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; +} + |