From d087f15786021a9605b20f4c678312510be4cac1 Mon Sep 17 00:00:00 2001 From: Vignesh R Date: Tue, 19 Dec 2017 12:51:16 +0200 Subject: [PATCH] dmaengine: ti-dma-crossbar: Fix event mapping for TPCC_EVT_MUX_60_63 Register layout of a typical TPCC_EVT_MUX_M_N register is such that the lowest numbered event is at the lowest byte address and highest numbered event at highest byte address. But TPCC_EVT_MUX_60_63 register layout is different, in that the lowest numbered event is at the highest address and highest numbered event is at the lowest address. Therefore, modify ti_am335x_xbar_write() to handle TPCC_EVT_MUX_60_63 register accordingly. Signed-off-by: Vignesh R Signed-off-by: Peter Ujfalusi Signed-off-by: Vinod Koul --- drivers/dma/ti-dma-crossbar.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c index 7df910e..9272b17 100644 --- a/drivers/dma/ti-dma-crossbar.c +++ b/drivers/dma/ti-dma-crossbar.c @@ -54,7 +54,15 @@ struct ti_am335x_xbar_map { static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u8 val) { - writeb_relaxed(val, iomem + event); + /* + * TPCC_EVT_MUX_60_63 register layout is different than the + * rest, in the sense, that event 63 is mapped to lowest byte + * and event 60 is mapped to highest, handle it separately. + */ + if (event >= 60 && event <= 63) + writeb_relaxed(val, iomem + (63 - event % 4)); + else + writeb_relaxed(val, iomem + event); } static void ti_am335x_xbar_free(struct device *dev, void *route_data) -- 2.7.4