linux-kernel - [PATCH v2 2/2] spi: sh-msiof: Use correct device for DMA mapping with IOMMU

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Date:	Fri, 11 Jul 2014 17:56:22 +0200
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	Mark Brown <broonie@...nel.org>, Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>
Cc:	dmaengine@...r.kernel.org, linux-spi@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2 2/2] spi: sh-msiof: Use correct device for DMA mapping with IOMMU

To function correctly in the presence of an IOMMU, the DMA buffers must be
mapped using the DMA channel's device instead of the MSIOF platform
device's device.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
v2:
  - Use "dma_chan.device->dev" instead of "dma_chan.dev->device",
  - Also fix calls to dma_unmap_single(), dma_mapping_error(), and
    dma_sync_single_for_*()".
---
 drivers/spi/spi-sh-msiof.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 9922ed3a4441..6f449b24704a 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -644,8 +644,8 @@ static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx,
 
 	if (tx) {
 		ier_bits |= IER_TDREQE | IER_TDMAE;
-		dma_sync_single_for_device(&p->pdev->dev, p->tx_dma_addr, len,
-					   DMA_TO_DEVICE);
+		dma_sync_single_for_device(p->master->dma_tx->device->dev,
+					   p->tx_dma_addr, len, DMA_TO_DEVICE);
 		desc_tx = dmaengine_prep_slave_single(p->master->dma_tx,
 					p->tx_dma_addr, len, DMA_TO_DEVICE,
 					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
@@ -716,7 +716,8 @@ static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx,
 	}
 
 	if (rx)
-		dma_sync_single_for_cpu(&p->pdev->dev, p->rx_dma_addr, len,
+		dma_sync_single_for_cpu(p->master->dma_rx->device->dev,
+					p->rx_dma_addr, len,
 					DMA_FROM_DEVICE);
 
 	return 0;
@@ -996,6 +997,7 @@ static int sh_msiof_request_dma(struct sh_msiof_spi_priv *p)
 	const struct sh_msiof_spi_info *info = dev_get_platdata(dev);
 	const struct resource *res;
 	struct spi_master *master;
+	struct device *tx_dev, *rx_dev;
 
 	if (!info || !info->dma_tx_id || !info->dma_rx_id)
 		return 0;	/* The driver assumes no error */
@@ -1026,21 +1028,23 @@ static int sh_msiof_request_dma(struct sh_msiof_spi_priv *p)
 	if (!p->rx_dma_page)
 		goto free_tx_page;
 
-	p->tx_dma_addr = dma_map_single(dev, p->tx_dma_page, PAGE_SIZE,
+	tx_dev = master->dma_tx->device->dev;
+	p->tx_dma_addr = dma_map_single(tx_dev, p->tx_dma_page, PAGE_SIZE,
 					DMA_TO_DEVICE);
-	if (dma_mapping_error(dev, p->tx_dma_addr))
+	if (dma_mapping_error(tx_dev, p->tx_dma_addr))
 		goto free_rx_page;
 
-	p->rx_dma_addr = dma_map_single(dev, p->rx_dma_page, PAGE_SIZE,
+	rx_dev = master->dma_rx->device->dev;
+	p->rx_dma_addr = dma_map_single(rx_dev, p->rx_dma_page, PAGE_SIZE,
 					DMA_FROM_DEVICE);
-	if (dma_mapping_error(dev, p->rx_dma_addr))
+	if (dma_mapping_error(rx_dev, p->rx_dma_addr))
 		goto unmap_tx_page;
 
 	dev_info(dev, "DMA available");
 	return 0;
 
 unmap_tx_page:
-	dma_unmap_single(dev, p->tx_dma_addr, PAGE_SIZE, DMA_TO_DEVICE);
+	dma_unmap_single(tx_dev, p->tx_dma_addr, PAGE_SIZE, DMA_TO_DEVICE);
 free_rx_page:
 	free_page((unsigned long)p->rx_dma_page);
 free_tx_page:
@@ -1062,8 +1066,10 @@ static void sh_msiof_release_dma(struct sh_msiof_spi_priv *p)
 		return;
 
 	dev = &p->pdev->dev;
-	dma_unmap_single(dev, p->rx_dma_addr, PAGE_SIZE, DMA_FROM_DEVICE);
-	dma_unmap_single(dev, p->tx_dma_addr, PAGE_SIZE, DMA_TO_DEVICE);
+	dma_unmap_single(master->dma_rx->device->dev, p->rx_dma_addr,
+			 PAGE_SIZE, DMA_FROM_DEVICE);
+	dma_unmap_single(master->dma_tx->device->dev, p->tx_dma_addr,
+			 PAGE_SIZE, DMA_TO_DEVICE);
 	free_page((unsigned long)p->rx_dma_page);
 	free_page((unsigned long)p->tx_dma_page);
 	dma_release_channel(master->dma_rx);
-- 
1.9.1

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