patches.renesas/0752-spi-sh-msiof-Use-correct-device-for-DMA-mapping-with.patch

From b1f44af2ea1ec518755b47779bf3bec50e75ff1e Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Fri, 11 Jul 2014 17:56:22 +0200
Subject: 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@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
(cherry picked from commit 5dabcf2f27ded864cf79204c4a3cca1516b66026)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 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 373de70baf08..2a4354dcd661 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -638,8 +638,8 @@ 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);
@@ -717,7 +717,8 @@ 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;
@@ -1003,6 +1004,7 @@ 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 */
@@ -1033,21 +1035,23 @@ 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:
@@ -1069,8 +1073,10 @@ 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);
-- 
2.1.2