diff options
| -rw-r--r-- | arch/arm/include/asm/imx-common/dma.h | 2 | ||||
| -rw-r--r-- | drivers/dma/apbh_dma.c | 22 |
2 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/include/asm/imx-common/dma.h b/arch/arm/include/asm/imx-common/dma.h index 5f516ef6e0..d5c1f7f255 100644 --- a/arch/arm/include/asm/imx-common/dma.h +++ b/arch/arm/include/asm/imx-common/dma.h @@ -161,4 +161,6 @@ void mxs_dma_init(void); int mxs_dma_init_channel(int chan); int mxs_dma_release(int chan); +void mxs_dma_circ_start(int chan, struct mxs_dma_desc *pdesc); + #endif /* __DMA_H__ */ diff --git a/drivers/dma/apbh_dma.c b/drivers/dma/apbh_dma.c index 96d4c9bb19..22defcd7d9 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) |