From patchwork Fri May 24 18:26:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Stevenson X-Patchwork-Id: 13673519 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AB9F1C25B7D for ; Fri, 24 May 2024 18:28:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=6sWX9gpDdUK0D+mjJg/WpbL/lAd/1vaL3ZpK2bpLeQc=; b=titz0VbJvLHRuI yVtL12ajhSNth3ssyJAzcPIpRr7iqmqGumW33ac5wJ71ks/1x6oyeAUF5ff5MBqVj/VDmtvErHIzX iRQWCQFUxUmbktAtICW5WoNK0hfcBVWWzcEe1tRQ2eRw+pS66tpktsFcgMmx6frNdGdiVVHVazQ8E +p9J3vG4hx2yCUGQgHYeKRU6BXu3omXwIRoL7DkKi3XJCSH3i91gE8Hg/ujRFRI2UNUlhrb0SzGJ4 0J/oq9s1UV0haXGD6vEY7EH6HvOwiZmpbLT/ps85aKkfzb6LCd5P7LLi8qMuZkkmRJgNB4UNQW60A n1iwULEPMaIIKP3ttk8A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sAZeJ-00000009ZOV-3gsO; Fri, 24 May 2024 18:28:15 +0000 Received: from mail-wm1-x361.google.com ([2a00:1450:4864:20::361]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sAZe2-00000009Z8P-3440 for linux-arm-kernel@lists.infradead.org; Fri, 24 May 2024 18:28:01 +0000 Received: by mail-wm1-x361.google.com with SMTP id 5b1f17b1804b1-4200ee78f34so32624885e9.3 for ; Fri, 24 May 2024 11:27:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raspberrypi.com; s=google; t=1716575273; x=1717180073; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=TKd9X1LOVt1ChaX4vRXT/Yfb21vDTf36hviq/MF6+cg=; b=Wo47nshlTkznIu8lrMDh+8rF0YLZ+2+4mTVytqotAk2gvAK2sxB5PYmOYSyi4lNF/C dx9bmRUepfuHfTnzm0cTndT0IVTxyUCo3zO8RjxlJJi1OJqMNSbV9/MER7KP/o3GKRxh 3MbU6YCcXnDEYh2K+KddFaIA1uEJ9JngV1RejFq4mme9IAxQv2FcllLJ6fIVJQ+ptMcu 3yWbx36d1xPZfuxqzb1fmJtoNQgb9CRSAnzDAqlRX6b3hAzONFrh4IKSzy0By7vxYpyQ sGHm9dnLyEPyF+JR45+VbfBFppO0dXogtOgMGXJBpbMBLuShaJxOtFi+PFMgk3X/fDkM ituw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716575273; x=1717180073; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=TKd9X1LOVt1ChaX4vRXT/Yfb21vDTf36hviq/MF6+cg=; b=wU17lHXYLnFcC9f0u/gIXYOJIcUQ9OpUj2W5DNBy0UErrgz+16NtmJ2AhnJqVr80I9 /+6C5U4ALziHc33AgotZaH6uoS2aLIaI+ipG6Mo5dU3520cDDvWc3Ipo4oJVR3c/EjLT JrQ3IOZflmbItAzJudBRWRNJ92nlAnQ6mG5K0MRwuqw7AdCuqvnGKXKjio7avBtHxjm7 Q3am7as4zjK9B0vEN2PbFFX20qGOOjE9hOTLWFtuaxc+kG8DgXzUe94uXlPUlgIKzgfE lmiXeTd2W5ky3fIncK8UbMdfqwbeA61W2VLU4sIke8D78VilgM9thW4RXqBsCuYcmi6o Vj3w== X-Forwarded-Encrypted: i=1; AJvYcCXjdaNQMV6Wa4+N7f6LAWcY9Ai/28NPNspSAb5NgNc8K34mDC3IgnGBobo4X/GOXMWyb0TFRz6FmgZO2gsg3670EPtEsLq37QqG/d33vxYjelcPU2A= X-Gm-Message-State: AOJu0YzjsUNZNjXI0yXX3naWp0h9624bFxaB8psF18FP2781T/RmuiNz qPgYy2wVbdk43vZUXNpy931n6TRQ75pi8DZX52EpnPgwKhoYH1D4lDskEQguK9N5iVcoa7YqFgc 44OlVIHkgzsGpge//MbBnykGJ7R5wBfFV X-Google-Smtp-Source: AGHT+IE1vodFu4VYv4ismPyHD4+ricu2iZqmWOTNKtTorabHI/piuhSxGYfbWmThDOKYJ4k1kIH/5D1hvWp9 X-Received: by 2002:a7b:c305:0:b0:41c:2313:d966 with SMTP id 5b1f17b1804b1-421089d3943mr28029795e9.1.1716575273524; Fri, 24 May 2024 11:27:53 -0700 (PDT) Received: from raspberrypi.com ([188.39.149.98]) by smtp-relay.gmail.com with ESMTPS id 5b1f17b1804b1-42100fb4c8fsm5347505e9.49.2024.05.24.11.27.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 May 2024 11:27:53 -0700 (PDT) X-Relaying-Domain: raspberrypi.com From: Dave Stevenson To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Broadcom internal kernel review list , Ray Jui , Scott Branden , Vinod Koul , Maxime Ripard , Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Ulf Hansson , Mark Brown , Christoph Hellwig , Marek Szyprowski , Robin Murphy , Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Vladimir Murzin , Phil Elwell , Stefan Wahren , Serge Semin Cc: devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mmc@vger.kernel.org, linux-spi@vger.kernel.org, iommu@lists.linux.dev, linux-sound@vger.kernel.org, Stefan Wahren , Dave Stevenson Subject: [PATCH 04/18] dmaengine: bcm2835: move CB info generation into separate function Date: Fri, 24 May 2024 19:26:48 +0100 Message-Id: <20240524182702.1317935-5-dave.stevenson@raspberrypi.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240524182702.1317935-1-dave.stevenson@raspberrypi.com> References: <20240524182702.1317935-1-dave.stevenson@raspberrypi.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240524_112759_005716_D310465E X-CRM114-Status: GOOD ( 17.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Stefan Wahren Actually the generation of the Control Block info follows some simple rules. So handle this with a separate function to avoid open coding for every DMA operation. Another advantage is that we can easier introduce other platforms with different info bits. Signed-off-by: Stefan Wahren Signed-off-by: Dave Stevenson --- drivers/dma/bcm2835-dma.c | 50 +++++++++++++++++++++++++-------------- 1 file changed, 32 insertions(+), 18 deletions(-) diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index 528c4593b45a..7cef7ff89575 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -201,6 +201,34 @@ static inline struct bcm2835_desc *to_bcm2835_dma_desc( return container_of(t, struct bcm2835_desc, vd.tx); } +static u32 bcm2835_dma_prepare_cb_info(struct bcm2835_chan *c, + enum dma_transfer_direction direction, + bool zero_page) +{ + u32 result; + + if (direction == DMA_MEM_TO_MEM) + return BCM2835_DMA_D_INC | BCM2835_DMA_S_INC; + + result = BCM2835_DMA_WAIT_RESP; + + /* Setup DREQ channel */ + if (c->dreq != 0) + result |= BCM2835_DMA_PER_MAP(c->dreq); + + if (direction == DMA_DEV_TO_MEM) { + result |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC; + } else { + result |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC; + + /* non-lite channels can write zeroes w/o accessing memory */ + if (zero_page && !c->is_lite_channel) + result |= BCM2835_DMA_S_IGNORE; + } + + return result; +} + static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc) { size_t i; @@ -615,7 +643,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_memcpy( { struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); struct bcm2835_desc *d; - u32 info = BCM2835_DMA_D_INC | BCM2835_DMA_S_INC; + u32 info = bcm2835_dma_prepare_cb_info(c, DMA_MEM_TO_MEM, false); u32 extra = BCM2835_DMA_INT_EN | BCM2835_DMA_WAIT_RESP; size_t max_len = bcm2835_dma_max_frame_length(c); size_t frames; @@ -646,7 +674,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg( struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); struct bcm2835_desc *d; dma_addr_t src = 0, dst = 0; - u32 info = BCM2835_DMA_WAIT_RESP; + u32 info = bcm2835_dma_prepare_cb_info(c, direction, false); u32 extra = BCM2835_DMA_INT_EN; size_t frames; @@ -656,19 +684,14 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg( return NULL; } - if (c->dreq != 0) - info |= BCM2835_DMA_PER_MAP(c->dreq); - if (direction == DMA_DEV_TO_MEM) { if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) return NULL; src = c->cfg.src_addr; - info |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC; } else { if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) return NULL; dst = c->cfg.dst_addr; - info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC; } /* count frames in sg list */ @@ -698,7 +721,8 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); struct bcm2835_desc *d; dma_addr_t src, dst; - u32 info = BCM2835_DMA_WAIT_RESP; + u32 info = bcm2835_dma_prepare_cb_info(c, direction, + buf_addr == od->zero_page); u32 extra = 0; size_t max_len = bcm2835_dma_max_frame_length(c); size_t frames; @@ -729,26 +753,16 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( "%s: buffer_length (%zd) is not a multiple of period_len (%zd)\n", __func__, buf_len, period_len); - /* Setup DREQ channel */ - if (c->dreq != 0) - info |= BCM2835_DMA_PER_MAP(c->dreq); - if (direction == DMA_DEV_TO_MEM) { if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) return NULL; src = c->cfg.src_addr; dst = buf_addr; - info |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC; } else { if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) return NULL; dst = c->cfg.dst_addr; src = buf_addr; - info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC; - - /* non-lite channels can write zeroes w/o accessing memory */ - if (buf_addr == od->zero_page && !c->is_lite_channel) - info |= BCM2835_DMA_S_IGNORE; } /* calculate number of frames */