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

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)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 7197498..7d0c7be 100644 (file)
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -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: