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dma: imx-sdma: Add new dma type for ssi dual fifo script

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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@freescale.com>
Acked-by: Kumar Gala <galak@codeaurora.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Nicolin Chen 2013-11-13 22:55:25 +08:00 • committed by Vinod Koul
parent cd72b8462a
commit 1a895578d4
3 changed files with 6 additions and 0 deletions
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1
Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
View file

@ -42,6 +42,7 @@ The full ID of peripheral types can be found below.
19 IPU Memory 19 IPU Memory
20 ASRC 20 ASRC
21 ESAI 21 ESAI
22 SSI Dual FIFO (needs firmware ver >= 2)
The third cell specifies the transfer priority as below. The third cell specifies the transfer priority as below.

4
drivers/dma/imx-sdma.c
View file

@ -725,6 +725,10 @@ static void sdma_get_pc(struct sdma_channel *sdmac,
per_2_emi = sdma->script_addrs->app_2_mcu_addr; per_2_emi = sdma->script_addrs->app_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_app_addr; emi_2_per = sdma->script_addrs->mcu_2_app_addr;
break; 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_SSI_SP:
case IMX_DMATYPE_MMC: case IMX_DMATYPE_MMC:
case IMX_DMATYPE_SDHC: case IMX_DMATYPE_SDHC:

1
include/linux/platform_data/dma-imx.h
View file

@ -39,6 +39,7 @@ enum sdma_peripheral_type {
IMX_DMATYPE_IPU_MEMORY, /* IPU Memory */ IMX_DMATYPE_IPU_MEMORY, /* IPU Memory */
IMX_DMATYPE_ASRC, /* ASRC */ IMX_DMATYPE_ASRC, /* ASRC */
IMX_DMATYPE_ESAI, /* ESAI */ IMX_DMATYPE_ESAI, /* ESAI */
IMX_DMATYPE_SSI_DUAL, /* SSI Dual FIFO */
}; };
enum imx_dma_prio { enum imx_dma_prio {