dmaengine: ti-dma-crossbar: Fix event mapping for TPCC_EVT_MUX_60_63

[ Upstream commit d087f15786021a9605b20f4c678312510be4cac1 ]

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 <vigneshr@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c
index 7df910e..9272b17 100644 (file)
--- 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)