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-rw-r--r--drivers/dma/apbh_dma.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/dma/apbh_dma.c b/drivers/dma/apbh_dma.c
index 96d4c9b..22defcd 100644
--- a/drivers/dma/apbh_dma.c
+++ b/drivers/dma/apbh_dma.c
@@ -545,6 +545,28 @@ int mxs_dma_go(int chan)
}
/*
+ * Execute a continuously running circular DMA descriptor.
+ * NOTE: This is not intended for general use, but rather
+ * for the LCD driver in Smart-LCD mode. It allows
+ * continuous triggering of the RUN bit there.
+ */
+void mxs_dma_circ_start(int chan, struct mxs_dma_desc *pdesc)
+{
+ struct mxs_apbh_regs *apbh_regs =
+ (struct mxs_apbh_regs *)MXS_APBH_BASE;
+
+ mxs_dma_flush_desc(pdesc);
+
+ mxs_dma_enable_irq(chan, 1);
+
+ writel(mxs_dma_cmd_address(pdesc),
+ &apbh_regs->ch[chan].hw_apbh_ch_nxtcmdar);
+ writel(1, &apbh_regs->ch[chan].hw_apbh_ch_sema);
+ writel(1 << (chan + APBH_CTRL0_CLKGATE_CHANNEL_OFFSET),
+ &apbh_regs->hw_apbh_ctrl0_clr);
+}
+
+/*
* Initialize the DMA hardware
*/
void mxs_dma_init(void)