From c3dfe7077630aa5f81d499c08964005d204c2b3b Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Thu, 15 Mar 2012 18:33:18 +0000
Subject: [PATCH] i.MX28: Add cache support into the APBH DMA driver
The desc_append() now flushes descriptors into RAM.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
---
drivers/dma/apbh_dma.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/apbh_dma.c b/drivers/dma/apbh_dma.c
index e85f5fe6d2..c086629b0a 100644
--- a/drivers/dma/apbh_dma.c
+++ b/drivers/dma/apbh_dma.c
@@ -93,6 +93,21 @@ static int mxs_dma_read_semaphore(int channel)
return tmp;
}
+#ifndef CONFIG_SYS_DCACHE_OFF
+void mxs_dma_flush_desc(struct mxs_dma_desc *desc)
+{
+ uint32_t addr;
+ uint32_t size;
+
+ addr = (uint32_t)desc;
+ size = roundup(sizeof(struct mxs_dma_desc), MXS_DMA_ALIGNMENT);
+
+ flush_dcache_range(addr, addr + size);
+}
+#else
+inline void mxs_dma_flush_desc(struct mxs_dma_desc *desc) {}
+#endif
+
/*
* Enable a DMA channel.
*
@@ -329,8 +344,10 @@ static int mxs_dma_release(int channel)
struct mxs_dma_desc *mxs_dma_desc_alloc(void)
{
struct mxs_dma_desc *pdesc;
+ uint32_t size;
- pdesc = memalign(MXS_DMA_ALIGNMENT, sizeof(struct mxs_dma_desc));
+ size = roundup(sizeof(struct mxs_dma_desc), MXS_DMA_ALIGNMENT);
+ pdesc = memalign(MXS_DMA_ALIGNMENT, size);
if (pdesc == NULL)
return NULL;
@@ -415,12 +432,16 @@ int mxs_dma_desc_append(int channel, struct mxs_dma_desc *pdesc)
last->cmd.next = mxs_dma_cmd_address(pdesc);
last->cmd.data |= MXS_DMA_DESC_CHAIN;
+
+ mxs_dma_flush_desc(last);
}
pdesc->flags |= MXS_DMA_DESC_READY;
if (pdesc->flags & MXS_DMA_DESC_FIRST)
pchan->pending_num++;
list_add_tail(&pdesc->node, &pchan->active);
+ mxs_dma_flush_desc(pdesc);
+
return ret;
}
--
2.39.5