[PATCH v4 05/09] iommu/ipmmu-vmsa: IPMMU device is 40-bit bus master

From	Magnus Damm <magnus.damm@gmail.com>
Newsgroups	linux.kernel
Subject	[PATCH v4 05/09] iommu/ipmmu-vmsa: IPMMU device is 40-bit bus master
Date	2017-06-19 11:20 +0200
Message-ID	<tU10J-Jx-5@gated-at.bofh.it> (permalink)
References	<tU10J-Jx-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

From: Magnus Damm <damm+renesas@opensource.se>

The r8a7795 IPMMU supports 40-bit bus mastering. Both
the coherent DMA mask and the streaming DMA mask are
set to unlock the 40-bit address space for coherent
allocations and streaming operations.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
---

 Changes since V3:
 - None

 Changes since V2:
 - Updated the code and commit message to use 40 bits instead of 64 bits

 Changes since V1:
 - Updated the commit message

 drivers/iommu/ipmmu-vmsa.c |    1 +
 1 file changed, 1 insertion(+)

--- 0021/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c	2017-06-19 14:05:33.720607110 +0900
@@ -1004,6 +1004,7 @@ static int ipmmu_probe(struct platform_d
 	spin_lock_init(&mmu->lock);
 	bitmap_zero(mmu->ctx, IPMMU_CTX_MAX);
 	mmu->features = of_device_get_match_data(&pdev->dev);
+	dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40));
 
 	/* Map I/O memory and request IRQ. */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

[PATCH v4 05/09] iommu/ipmmu-vmsa: IPMMU device is 40-bit bus master Magnus Damm <magnus.damm@gmail.com> - 2017-06-19 11:20 +0200

csiph-web