From patchwork Fri Aug 8 18:19:43 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Santosh Shilimkar X-Patchwork-Id: 4697621 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 9250CC0338 for ; Fri, 8 Aug 2014 18:23:06 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 688ED2017A for ; Fri, 8 Aug 2014 18:23:02 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5E09E20160 for ; Fri, 8 Aug 2014 18:23:01 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XFomw-0007K8-76; Fri, 08 Aug 2014 18:21:14 +0000 Received: from comal.ext.ti.com ([198.47.26.152]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XFomT-0006yS-9F for linux-arm-kernel@lists.infradead.org; Fri, 08 Aug 2014 18:20:46 +0000 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id s78IKBZw022094; Fri, 8 Aug 2014 13:20:11 -0500 Received: from DLEE70.ent.ti.com (dlemailx.itg.ti.com [157.170.170.113]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id s78IKBfj017305; Fri, 8 Aug 2014 13:20:11 -0500 Received: from dlep33.itg.ti.com (157.170.170.75) by DLEE70.ent.ti.com (157.170.170.113) with Microsoft SMTP Server id 14.3.174.1; Fri, 8 Aug 2014 13:20:11 -0500 Received: from ula0393909.am.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id s78IK4U8008140; Fri, 8 Aug 2014 13:20:10 -0500 From: Santosh Shilimkar To: , Subject: [Patch v3 4/6] Documentation: dt: soc: add Keystone Navigator DMA bindings Date: Fri, 8 Aug 2014 14:19:43 -0400 Message-ID: <1407521985-22574-5-git-send-email-santosh.shilimkar@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1407521985-22574-1-git-send-email-santosh.shilimkar@ti.com> References: <1407521985-22574-1-git-send-email-santosh.shilimkar@ti.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140808_112045_422240_9CA0B603 X-CRM114-Status: GOOD ( 13.74 ) X-Spam-Score: -5.7 (-----) Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, arnd@arndb.de, gregkh@linuxfoundation.org, sandeep_n@ti.com, olof@lixom.net, Santosh Shilimkar , galak@codeaurora.org, grant.likely@linaro.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,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 Keystone Navigator DMA driver sets up the dma channels and flows for the QMSS(Queue Manager SubSystem) who triggers the actual data movements across clients using destination queues. Every client modules like NETCP(Network Coprocessor), SRIO(Serial Rapid IO) and CRYPTO Engines has its own instance of packet dma hardware. QMSS has also an internal packet DMA module which is used as an infrastructure DMA with zero copy. Initially this driver was proposed as DMA engine driver but since the hardware is not typical DMA engine and hence doesn't comply with typical DMA engine driver needs, that approach was naked. Link to that discussion - https://lkml.org/lkml/2014/3/18/340 As aligned, now we pair the Navigator DMA with its companion Navigator QMSS subsystem driver. Cc: Greg Kroah-Hartman Cc: Kumar Gala Cc: Olof Johansson Cc: Arnd Bergmann Cc: Grant Likely Cc: Rob Herring Cc: Mark Rutland Signed-off-by: Sandeep Nair Signed-off-by: Santosh Shilimkar --- .../bindings/soc/ti/keystone-navigator-dma.txt | 111 ++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/ti/keystone-navigator-dma.txt diff --git a/Documentation/devicetree/bindings/soc/ti/keystone-navigator-dma.txt b/Documentation/devicetree/bindings/soc/ti/keystone-navigator-dma.txt new file mode 100644 index 0000000..337c4ea --- /dev/null +++ b/Documentation/devicetree/bindings/soc/ti/keystone-navigator-dma.txt @@ -0,0 +1,111 @@ +Keystone Navigator DMA Controller + +This document explains the device tree bindings for the packet dma +on keystone devices. The Keystone Navigator DMA driver sets up the dma +channels and flows for the QMSS(Queue Manager SubSystem) who triggers +the actual data movements across clients using destination queues. Every +client modules like NETCP(Network Coprocessor), SRIO(Serial Rapid IO), +CRYPTO Engines etc has its own instance of dma hardware. QMSS has also +an internal packet DMA module which is used as an infrastructure DMA +with zero copy. + +Navigator DMA cloud layout: + ------------------ + | Navigator DMAs | + ------------------ + | + |-> DMA instance #0 + | + |-> DMA instance #1 + . + . + | + |-> DMA instance #n + +Navigator DMA properties: +Required properties: + - compatible: Should be "ti,keystone-navigator-dma" + - clocks: phandle to dma instances clocks. The clock handles can be as + many as the dma instances. The order should be maintained as per + the dma instances. + - ti,navigator-cloud-address: Should contain base address for the multi-core + navigator cloud and number of addresses depends on SOC integration + configuration.. Navigator cloud global address needs to be programmed + into DMA and the DMA uses it as the physical addresses to reach queue + managers. Note that these addresses though points to queue managers, + they are relevant only from DMA perspective. The QMSS may not choose to + use them since it has a different address space view to reach all + its components. + +DMA instance properties: +Required properties: + - reg: Should contain register location and length of the following dma + register regions. Register regions should be specified in the following + order. + - Global control register region (global). + - Tx DMA channel configuration register region (txchan). + - Rx DMA channel configuration register region (rxchan). + - Tx DMA channel Scheduler configuration register region (txsched). + - Rx DMA flow configuration register region (rxflow). + +Optional properties: + - reg-names: Names for the register regions. + - ti,enable-all: Enable all DMA channels vs clients opening specific channels + what they need. This property is useful for the userspace fast path + case where the linux drivers enables the channels used by userland + stack. + - ti,loop-back: To loopback Tx streaming I/F to Rx streaming I/F. Used for + infrastructure transfers. + - ti,rx-retry-timeout: Number of dma cycles to wait before retry on buffer + starvation. + +Example: + + knav_dmas: knav_dmas@0 { + compatible = "ti,keystone-navigator-dma"; + clocks = <&papllclk>, <&clkxge>; + #address-cells = <1>; + #size-cells = <1>; + ranges; + ti,navigator-cloud-address = <0x23a80000 0x23a90000 + 0x23aa0000 0x23ab0000>; + + dma_gbe: dma_gbe@0 { + reg = <0x2004000 0x100>, + <0x2004400 0x120>, + <0x2004800 0x300>, + <0x2004c00 0x120>, + <0x2005000 0x400>; + reg-names = "global", "txchan", "rxchan", + "txsched", "rxflow"; + }; + + dma_xgbe: dma_xgbe@0 { + reg = <0x2fa1000 0x100>, + <0x2fa1400 0x200>, + <0x2fa1800 0x200>, + <0x2fa1c00 0x200>, + <0x2fa2000 0x400>; + reg-names = "global", "txchan", "rxchan", + "txsched", "rxflow"; + }; + }; + +Navigator DMA client: +Required properties: + - ti,navigator-dmas: List of one or more DMA specifiers, each consisting of + - A phandle pointing to DMA instance node + - A DMA channel number as a phandle arg. + - ti,navigator-dma-names: Contains dma channel name for each DMA specifier in + the 'ti,navigator-dmas' property. + +Example: + + netcp: netcp@2090000 { + .. + ti,navigator-dmas = <&dma_gbe 22>, + <&dma_gbe 23>, + <&dma_gbe 8>; + ti,navigator-dma-names = "netrx0", "netrx1", "nettx"; + .. + };