linux-kernel - [PATCH v2 3/4] dmaengine: xilinx_dma: Introduce helper macro for preparing dma address

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Date:   Sat, 29 Sep 2018 11:17:59 -0600
From:   Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
To:     <vkoul@...nel.org>, <dan.j.williams@...el.com>,
        <michal.simek@...inx.com>, <appana.durga.rao@...inx.com>,
        <radhey.shyam.pandey@...inx.com>
CC:     <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 3/4] dmaengine: xilinx_dma: Introduce helper macro for preparing dma address

This patch introduces the xilinx_prep_dma_addr_t macro which prepares
dma_addr_t from hardware buffer descriptor LSB and MSB fields. It will
be used in simple dma 64-bit programming sequence.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
---
Changes for v2:
New patch- Preparatory change for 4/4 fix.
---
 drivers/dma/xilinx/xilinx_dma.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index a37871e..c27ab64 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -190,6 +190,8 @@
 /* AXI CDMA Specific Masks */
 #define XILINX_CDMA_CR_SGMODE          BIT(3)
 
+#define xilinx_prep_dma_addr_t(addr)	\
+	((dma_addr_t)((u64)addr##_##msb << 32 | (addr)))
 /**
  * struct xilinx_vdma_desc_hw - Hardware Descriptor
  * @next_desc: Next Descriptor Pointer @0x00
-- 
1.7.1