From patchwork Wed Apr 8 13:14:47 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 6179541 Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 1F8ABBF4A6 for ; Wed, 8 Apr 2015 13:18:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E49F42037F for ; Wed, 8 Apr 2015 13:18:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AE9B72037A for ; Wed, 8 Apr 2015 13:18:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932070AbbDHNSS (ORCPT ); Wed, 8 Apr 2015 09:18:18 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:56962 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754104AbbDHNPu (ORCPT ); Wed, 8 Apr 2015 09:15:50 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id t38DFA6H003486; Wed, 8 Apr 2015 08:15:10 -0500 Received: from DLEE71.ent.ti.com (dlee71.ent.ti.com [157.170.170.114]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id t38DF9LJ016380; Wed, 8 Apr 2015 08:15:09 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DLEE71.ent.ti.com (157.170.170.114) with Microsoft SMTP Server id 14.3.224.2; Wed, 8 Apr 2015 08:15:08 -0500 Received: from dflp33.itg.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id t38DErxO006522; Wed, 8 Apr 2015 08:15:05 -0500 From: Peter Ujfalusi To: , , CC: , , , , , , , , Subject: [PATCH v4 3/8] dmaengine: Add driver for TI DMA crossbar on DRA7x Date: Wed, 8 Apr 2015 16:14:47 +0300 Message-ID: <1428498892-28471-4-git-send-email-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.3.5 In-Reply-To: <1428498892-28471-1-git-send-email-peter.ujfalusi@ti.com> References: <1428498892-28471-1-git-send-email-peter.ujfalusi@ti.com> MIME-Version: 1.0 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The DRA7x has more peripherals with DMA requests than the sDMA can handle: 205 vs 127. All DMA requests are routed through the DMA crossbar, which can be configured to route selected incoming DMA requests to specific sDMA request. Signed-off-by: Peter Ujfalusi --- drivers/dma/Kconfig | 4 + drivers/dma/Makefile | 1 + drivers/dma/ti-dma-crossbar.c | 185 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 190 insertions(+) create mode 100644 drivers/dma/ti-dma-crossbar.c diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 91eced044321..33a7401597be 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -234,6 +234,9 @@ config TI_EDMA Enable support for the TI EDMA controller. This DMA engine is found on TI DaVinci and AM33xx parts. +config TI_DMA_CROSSBAR + bool + config ARCH_HAS_ASYNC_TX_FIND_CHANNEL bool @@ -319,6 +322,7 @@ config DMA_OMAP depends on ARCH_OMAP select DMA_ENGINE select DMA_VIRTUAL_CHANNELS + select TI_DMA_CROSSBAR if SOC_DRA7XX config DMA_BCM2835 tristate "BCM2835 DMA engine support" diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index 7e8301cb489d..19ac70b8af0a 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o obj-$(CONFIG_DMA_OMAP) += omap-dma.o +obj-$(CONFIG_TI_DMA_CROSSBAR) += ti-dma-crossbar.o obj-$(CONFIG_DMA_BCM2835) += bcm2835-dma.o obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c new file mode 100644 index 000000000000..5cb1eb7e86d2 --- /dev/null +++ b/drivers/dma/ti-dma-crossbar.c @@ -0,0 +1,185 @@ +/* + * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com + * Author: Peter Ujfalusi + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define TI_XBAR_OUTPUTS 127 +#define TI_XBAR_INPUTS 256 + +static DEFINE_IDR(map_idr); + +struct ti_dma_xbar_data { + void __iomem *iomem; + + struct dma_router dmarouter; + + uint safe_val; /* Value to rest the crossbar lines */ + uint xbar_requests; /* number of DMA requests connected to XBAR */ + uint dma_requests; /* number of DMA requests forwarded to DMA */ +}; + +struct ti_dma_xbar_map { + int xbar_in; + int xbar_out; +}; + +static inline void ti_dma_xbar_write(void __iomem *iomem, int xbar, int val) +{ + writew_relaxed(val, iomem + (xbar * 2)); +} + +static void ti_dma_xbar_free(struct device *dev, void *route_data) +{ + struct ti_dma_xbar_data *xbar = dev_get_drvdata(dev); + struct ti_dma_xbar_map *map = route_data; + + dev_dbg(dev, "Unmapping XBAR%d (was routed to %d)\n", + map->xbar_in, map->xbar_out); + + ti_dma_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val); + idr_remove(&map_idr, map->xbar_out); + kfree(map); +} + +static void *ti_dma_xbar_route_allocate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct platform_device *pdev = of_find_device_by_node(ofdma->of_node); + struct ti_dma_xbar_data *xbar = platform_get_drvdata(pdev); + struct ti_dma_xbar_map *map; + + if (dma_spec->args[0] >= xbar->xbar_requests) { + dev_err(&pdev->dev, "Invalid XBAR request number: %d\n", + dma_spec->args[0]); + return NULL; + } + + dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0); + if (!dma_spec->np) { + dev_err(&pdev->dev, "Can't get DMA master\n"); + return NULL; + } + + map = kzalloc(sizeof(*map), GFP_KERNEL); + if (!map) + return NULL; + + map->xbar_out = idr_alloc(&map_idr, NULL, 0, xbar->dma_requests, + GFP_KERNEL); + map->xbar_in = dma_spec->args[0]; + + /* The DMA request is 1 based in sDMA */ + dma_spec->args[0] = map->xbar_out + 1; + + dev_dbg(&pdev->dev, "Mapping XBAR%d to DMA%d\n", + map->xbar_in, map->xbar_out); + + ti_dma_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in); + + return map; +} + +static int ti_dma_xbar_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct device_node *dma_node; + struct ti_dma_xbar_data *xbar; + struct resource *res; + void __iomem *iomem; + int i, ret; + + if (!node) + return -ENODEV; + + dma_node = of_parse_phandle(node, "dma-masters", 0); + if (!dma_node) { + dev_err(&pdev->dev, "Can't get DMA master node\n"); + return -ENODEV; + } + + xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL); + if (!xbar) + return -ENOMEM; + + if (of_property_read_u32(dma_node, "dma-requests", + &xbar->dma_requests)) { + dev_info(&pdev->dev, + "Missing XBAR output information, using %u.\n", + TI_XBAR_OUTPUTS); + xbar->dma_requests = TI_XBAR_OUTPUTS; + } + of_node_put(dma_node); + + if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) { + dev_info(&pdev->dev, + "Missing XBAR input information, using %u.\n", + TI_XBAR_INPUTS); + xbar->xbar_requests = TI_XBAR_INPUTS; + } + + if (of_property_read_u32(node, "ti,dma-safe-map", &xbar->safe_val)) + xbar->safe_val = 0; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res), + dev_name(&pdev->dev))) + return -ENODEV; + + iomem = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + if (!iomem) + return -ENOMEM; + + xbar->iomem = iomem; + + xbar->dmarouter.dev = &pdev->dev; + xbar->dmarouter.route_free = ti_dma_xbar_free; + + platform_set_drvdata(pdev, xbar); + + ret = of_dma_router_register(node, ti_dma_xbar_route_allocate, + &xbar->dmarouter); + if (ret) + return -ENODEV; + + /* Reset the crossbar */ + for (i = 0; i < xbar->dma_requests; i++) + ti_dma_xbar_write(xbar->iomem, i, xbar->safe_val); + + return 0; +} + +static const struct of_device_id ti_dma_xbar_match[] = { + { .compatible = "ti,dra7-dma-crossbar" }, + {}, +}; + +static struct platform_driver ti_dma_xbar_driver = { + .driver = { + .name = "ti-dma-crossbar", + .of_match_table = of_match_ptr(ti_dma_xbar_match), + }, + .probe = ti_dma_xbar_probe, +}; + +int omap_dmaxbar_init(void) +{ + return platform_driver_register(&ti_dma_xbar_driver); +} +arch_initcall(omap_dmaxbar_init);