karo: merge with Ka-Ro specific tree for secure boot support

[karo-tx-uboot.git] / drivers / dma / apbh_dma.c

diff --git a/drivers/dma/apbh_dma.c b/drivers/dma/apbh_dma.c
index eab87bc9f4d6fe381684510787386a9e81c6ead8..983111ad29e8a18b360322ba09b908cc4785eb8a 100644 (file)
--- a/drivers/dma/apbh_dma.c
+++ b/drivers/dma/apbh_dma.c
@@ -584,6 +584,28 @@ int mxs_dma_go(int chan)
        return ret;
 }
 
+/*
+ * 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
  */