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MLK-9986-4 dma: imx-sdma: add new ecspi tx script

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Current ecspi rom script didn't take care of rxfifo overflow risk. Add new
ecspi tx script to check the rxfifo status, if it is near to full(>=48 bytes),
do not copy data to txfifo which will trigger data push into rxfifo. Because
rx script may not read rxfifo in time, we have to consider it.

Signed-off-by: Robin Gong <b38343@freescale.com>
(cherry picked from commit 17f472aa698aba0af5da4566df447e23306f4289)
(cherry picked from commit 90c929d7d1a3f8e196641b5ed7a33d2ee03bd63c)
(cherry picked from commit 6d76bdcf2097e4198217edf27363cf6ba2e6542a)
This commit is contained in:
Robin Gong
2014-12-18 12:41:16 +08:00
committed by Jason Liu
parent d33664d975
commit 2a44d6fd2d
1 changed files with 4 additions and 1 deletions
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5
drivers/dma/imx-sdma.c
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@ -7,7 +7,7 @@
*
* Based on code from Freescale:
*
* Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2004-2015 Freescale Semiconductor, Inc. All Rights Reserved.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
@ -865,6 +865,9 @@ static void sdma_get_pc(struct sdma_channel *sdmac,
emi_2_per = sdma->script_addrs->mcu_2_ata_addr;
break;
case IMX_DMATYPE_CSPI:
per_2_emi = sdma->script_addrs->app_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_ecspi_addr;
break;
case IMX_DMATYPE_EXT:
case IMX_DMATYPE_SSI:
case IMX_DMATYPE_SAI: