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Message-ID: <ea134688ce580e1159a22a9c5666b3e568f23963.1383907685.git.b42378@freescale.com>
Date: Fri, 8 Nov 2013 18:49:34 +0800
From: Nicolin Chen <b42378@...escale.com>
To: <vinod.koul@...el.com>, <dan.j.williams@...el.com>,
<s.hauer@...gutronix.de>, <timur@...i.org>, <shawn.guo@...aro.org>,
<broonie@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>,
<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <dmaengine@...r.kernel.org>,
<linuxppc-dev@...ts.ozlabs.org>, <alsa-devel@...a-project.org>,
<rob.herring@...xeda.com>, <mark.rutland@....com>,
<swarren@...dotorg.org>, <pawel.moll@....com>,
<ijc+devicetree@...lion.org.uk>
Subject: [PATCH v4 2/4] dma: imx-sdma: Add new dma type for ssi dual fifo script
This patch adds a new DMA_TYPE for SSI dual FIFO script, included
in SDMA firmware version 2. This script would allow SSI use dual
fifo mode to transimit/receive data without occasional hardware
underrun/overrun.
Signed-off-by: Nicolin Chen <b42378@...escale.com>
---
Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt | 1 +
drivers/dma/imx-sdma.c | 4 ++++
include/linux/platform_data/dma-imx.h | 1 +
3 files changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
index 4fa814d..68b83ec 100644
--- a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
+++ b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
@@ -42,6 +42,7 @@ The full ID of peripheral types can be found below.
19 IPU Memory
20 ASRC
21 ESAI
+ 22 SSI Dual FIFO (needs firmware ver >= 2)
The third cell specifies the transfer priority as below.
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index c7ece8d..efaa9a9 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -725,6 +725,10 @@ static void sdma_get_pc(struct sdma_channel *sdmac,
per_2_emi = sdma->script_addrs->app_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_app_addr;
break;
+ case IMX_DMATYPE_SSI_DUAL:
+ per_2_emi = sdma->script_addrs->ssish_2_mcu_addr;
+ emi_2_per = sdma->script_addrs->mcu_2_ssish_addr;
+ break;
case IMX_DMATYPE_SSI_SP:
case IMX_DMATYPE_MMC:
case IMX_DMATYPE_SDHC:
diff --git a/include/linux/platform_data/dma-imx.h b/include/linux/platform_data/dma-imx.h
index beac6b8..bcbc6c3 100644
--- a/include/linux/platform_data/dma-imx.h
+++ b/include/linux/platform_data/dma-imx.h
@@ -39,6 +39,7 @@ enum sdma_peripheral_type {
IMX_DMATYPE_IPU_MEMORY, /* IPU Memory */
IMX_DMATYPE_ASRC, /* ASRC */
IMX_DMATYPE_ESAI, /* ESAI */
+ IMX_DMATYPE_SSI_DUAL, /* SSI Dual FIFO */
};
enum imx_dma_prio {
--
1.8.4
--
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