diff options
Diffstat (limited to 'drivers/gpu/drm/openchrome/via_sgdma.c')
| -rw-r--r-- | drivers/gpu/drm/openchrome/via_sgdma.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/gpu/drm/openchrome/via_sgdma.c b/drivers/gpu/drm/openchrome/via_sgdma.c new file mode 100644 index 000000000000..e0401096435a --- /dev/null +++ b/drivers/gpu/drm/openchrome/via_sgdma.c @@ -0,0 +1,118 @@ +/************************************************************************** + * + * Copyright (c) 2012 James Simmons <jsimmons@infradead.org> + * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS 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 "via_drv.h" + +static int +via_pcie_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem) +{ + struct sgdma_tt *dma_tt = (struct sgdma_tt *) ttm; + struct ttm_bo_device *bdev = dma_tt->sgdma.ttm.bdev; + struct via_device *dev_priv = + container_of(bdev, struct via_device, bdev); + int i; + + /* Disable gart table HW protect */ + svga_wseq_mask(VGABASE, 0x6C, 0x00, BIT(7)); + + /* Update the relevant entries */ + dma_tt->offset = mem->start << PAGE_SHIFT; + for (i = 0; i < ttm->num_pages; i++) { + writel(page_to_pfn(ttm->pages[i]) & 0x3FFFFFFF, + dev_priv->gart.virtual + dma_tt->offset + i); + } + + /* Invalided GTI cache */ + svga_wseq_mask(VGABASE, 0x6F, BIT(7), BIT(7)); + + /* Enable gart table HW protect */ + svga_wseq_mask(VGABASE, 0x6C, BIT(7), BIT(7)); + return 1; +} + +static int +via_pcie_sgdma_unbind(struct ttm_tt *ttm) +{ + struct sgdma_tt *dma_tt = (struct sgdma_tt *) ttm; + struct ttm_bo_device *bdev = dma_tt->sgdma.ttm.bdev; + struct via_device *dev_priv = + container_of(bdev, struct via_device, bdev); + int i; + + if (ttm->state != tt_bound) + return 0; + + /* Disable gart table HW protect */ + svga_wseq_mask(VGABASE, 0x6C, 0x00, BIT(7)); + + /* Update the relevant entries */ + for (i = 0; i < ttm->num_pages; i++) + writel(0x80000000, dev_priv->gart.virtual + dma_tt->offset + i); + dma_tt->offset = 0; + + /* Invalided GTI cache */ + svga_wseq_mask(VGABASE, 0x6F, BIT(7), BIT(7)); + + /* Enable gart table HW protect */ + svga_wseq_mask(VGABASE, 0x6C, BIT(7), BIT(7)); + return 0; +} + +static void +via_sgdma_destroy(struct ttm_tt *ttm) +{ + struct sgdma_tt *dma_tt = (struct sgdma_tt *) ttm; + + if (ttm) { + ttm_dma_tt_fini(&dma_tt->sgdma); + kfree(dma_tt); + } +} + +static struct ttm_backend_func ttm_sgdma_func = { + .bind = via_pcie_sgdma_bind, + .unbind = via_pcie_sgdma_unbind, + .destroy = via_sgdma_destroy, +}; + +struct ttm_tt * +via_sgdma_backend_init(struct ttm_bo_device *bdev, unsigned long size, + uint32_t page_flags, struct page *dummy_read_page) +{ + struct sgdma_tt *dma_tt; + + dma_tt = kzalloc(sizeof(*dma_tt), GFP_KERNEL); + if (!dma_tt) + return NULL; + + dma_tt->sgdma.ttm.func = &ttm_sgdma_func; + + if (ttm_dma_tt_init(&dma_tt->sgdma, bdev, size, page_flags, dummy_read_page)) { + kfree(dma_tt); + return NULL; + } + return &dma_tt->sgdma.ttm; +} +EXPORT_SYMBOL(via_sgdma_backend_init); |