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Fri, 24 May 2024 11:27:56 -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, Dave Stevenson Subject: [PATCH 09/18] dmaengine: bcm2835: Add function to handle DMA mapping Date: Fri, 24 May 2024 19:26:53 +0100 Message-Id: <20240524182702.1317935-10-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-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The code handling DMA mapping is currently incorrect and needs a sequence of fixups. Move the mapping out into a separate function and structure to allow for those fixes to be applied more cleanly. Signed-off-by: Dave Stevenson --- drivers/dma/bcm2835-dma.c | 46 ++++++++++++++++++++++++++++++++------- 1 file changed, 38 insertions(+), 8 deletions(-) diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index aefaa1f01d7f..ef1d95bae84e 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -65,6 +65,10 @@ struct bcm2835_cb_entry { dma_addr_t paddr; }; +struct bcm2835_dma_chan_map { + dma_addr_t addr; +}; + struct bcm2835_chan { struct virt_dma_chan vc; @@ -74,6 +78,7 @@ struct bcm2835_chan { int ch; struct bcm2835_desc *desc; struct dma_pool *cb_pool; + struct bcm2835_dma_chan_map map; void __iomem *chan_base; int irq_number; @@ -268,6 +273,19 @@ static inline bool need_dst_incr(enum dma_transfer_direction direction) } return false; +}; + +static int bcm2835_dma_map_slave_addr(struct dma_chan *chan, + phys_addr_t dev_addr, + size_t dev_size, + enum dma_data_direction dev_dir) +{ + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + struct bcm2835_dma_chan_map *map = &c->map; + + map->addr = dev_addr; + + return 0; } static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc) @@ -734,13 +752,19 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg( } if (direction == DMA_DEV_TO_MEM) { - if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) + if (bcm2835_dma_map_slave_addr(chan, c->cfg.src_addr, + c->cfg.src_addr_width, + DMA_TO_DEVICE)) return NULL; - src = c->cfg.src_addr; + + src = c->map.addr; } else { - if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) + if (bcm2835_dma_map_slave_addr(chan, c->cfg.dst_addr, + c->cfg.dst_addr_width, + DMA_FROM_DEVICE)) return NULL; - dst = c->cfg.dst_addr; + + dst = c->map.addr; } /* count frames in sg list */ @@ -795,14 +819,20 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( __func__, buf_len, period_len); if (direction == DMA_DEV_TO_MEM) { - if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) + if (bcm2835_dma_map_slave_addr(chan, c->cfg.src_addr, + c->cfg.src_addr_width, + DMA_TO_DEVICE)) return NULL; - src = c->cfg.src_addr; + + src = c->map.addr; dst = buf_addr; } else { - if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) + if (bcm2835_dma_map_slave_addr(chan, c->cfg.dst_addr, + c->cfg.dst_addr_width, + DMA_FROM_DEVICE)) return NULL; - dst = c->cfg.dst_addr; + + dst = c->map.addr; src = buf_addr; }