diff options
Diffstat (limited to 'drivers/dma/apbh_dma.c')
| -rw-r--r-- | drivers/dma/apbh_dma.c | 22 |
1 files changed, 22 insertions, 0 deletions
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) |