From: Vinod Koul <vinod.koul@intel.com>
To: Baolin Wang <baolin.wang@linaro.org>
Cc: Dan Williams <dan.j.williams@intel.com>,
Eric Long <eric.long@spreadtrum.com>,
Mark Brown <broonie@kernel.org>,
dmaengine@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: [4/5] dmaengine: sprd: Add Spreadtrum DMA configuration
Date: Fri, 13 Apr 2018 09:09:18 +0530 [thread overview]
Message-ID: <20180413033917.GH6014@localhost> (raw)
On Thu, Apr 12, 2018 at 07:30:01PM +0800, Baolin Wang wrote:
> >> > what does block and transaction len refer to here
> >>
> >> Our DMA has 3 transfer mode: transaction transfer, block transfer and
> >> fragment transfer. One transaction transfer can contain several blocks
> >> transfer, and each block can be set proper block step. One block can
> >> contain several fragments transfer with proper fragment step. It can
> >> generate interrupts when one transaction transfer or block transfer or
> >> fragment transfer is completed if user set the interrupt type. So here
> >> we should set the length for transaction transfer, block transfer and
> >> fragment transfer.
> >
> > what are the max size these types support?
>
> These types max size definition:
>
> #define SPRD_DMA_FRG_LEN_MASK GENMASK(16, 0)
>
> #define SPRD_DMA_BLK_LEN_MASK GENMASK(16, 0)
>
> #define SPRD_DMA_TRSC_LEN_MASK GENMASK(27, 0)
They are register defines. How many items or bytes do each type of txn
support?
next reply other threads:[~2018-04-13 3:39 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-13 3:39 Vinod Koul [this message]
-- strict thread matches above, loose matches on Subject: below --
2018-04-17 6:06 [4/5] dmaengine: sprd: Add Spreadtrum DMA configuration Baolin Wang
2018-04-16 15:35 Vinod Koul
2018-04-16 6:32 Baolin Wang
2018-04-16 3:58 Vinod Koul
2018-04-13 10:48 Baolin Wang
2018-04-13 10:11 Vinod Koul
2018-04-13 6:41 Baolin Wang
2018-04-13 6:36 Vinod Koul
2018-04-13 6:17 Baolin Wang
2018-04-13 5:44 Baolin Wang
2018-04-13 3:43 Vinod Koul
2018-04-12 11:36 Baolin Wang
2018-04-12 11:30 Baolin Wang
2018-04-12 9:37 Vinod Koul
2018-04-11 12:13 Baolin Wang
2018-04-11 9:36 Vinod Koul
2018-04-10 7:46 Baolin Wang
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