From patchwork Sat Jun 8 16:46:21 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Simmons X-Patchwork-Id: 2692741 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by patchwork1.kernel.org (Postfix) with ESMTP id 2BCF53FC23 for ; Sat, 8 Jun 2013 16:46:52 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2E636E613B for ; Sat, 8 Jun 2013 09:46:52 -0700 (PDT) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) by gabe.freedesktop.org (Postfix) with ESMTP id 79EA2E612C; Sat, 8 Jun 2013 09:46:23 -0700 (PDT) Received: from jsimmons (helo=localhost) by casper.infradead.org with local-esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UlMHV-0005TH-Dq; Sat, 08 Jun 2013 16:46:22 +0000 Date: Sat, 8 Jun 2013 17:46:21 +0100 (BST) From: James Simmons To: DRI development list Subject: [RFC 4/21] DRM: Add VIA DRM driver Message-ID: User-Agent: Alpine 2.03 (LFD 1266 2009-07-14) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130608_174621_563280_861CDB2C X-CRM114-Status: GOOD ( 13.79 ) X-Spam-Score: -1.9 (-) X-Spam-Report: SpamAssassin version 3.3.2 on casper.infradead.org summary: Content analysis details: (-1.9 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 NO_RELAYS Informational: message was not relayed via SMTP -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: OpenChrome Development X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+patchwork-dri-devel=patchwork.kernel.org@lists.freedesktop.org Errors-To: dri-devel-bounces+patchwork-dri-devel=patchwork.kernel.org@lists.freedesktop.org commit 6e79030fb92d3461b4a962630245d93944d5d349 Author: James Simmons Date: Fri Jun 7 20:17:06 2013 -0400 via: ttm pcie dma bo_driver handling Newer VIA hardware has moved from AGP to more modern PCIe based hardware. The TTM layer provides support for AGP but drm drivers need to handle PCIe support themselves. The code in via_sgdma.c provides the TTM backend so one can allows the graphics card direct access to the host system memory. Signed-Off-by: James Simmons diff --git a/drivers/gpu/drm/via/via_sgdma.c b/drivers/gpu/drm/via/via_sgdma.c new file mode 100644 index 0000000..0dfd1a6 --- /dev/null +++ b/drivers/gpu/drm/via/via_sgdma.c @@ -0,0 +1,118 @@ +/************************************************************************** + * + * Copyright (c) 2012 James Simmons + * 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 drm_via_private *dev_priv = + container_of(bdev, struct drm_via_private, 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 drm_via_private *dev_priv = + container_of(bdev, struct drm_via_private, 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);