ARC: [plat-axs103] Add temporary quirk to reset ethernet IP

DW ethernet controller on AXS10x hangs sometimes after SW reset, so
add temporary quirk to reset DW ethernet controller IP core.
This quirk can be removed after axs10x reset driver
(see http://patchwork.ozlabs.org/patch/800273/)
or simple reset driver
(see https://patchwork.kernel.org/patch/9903375/)
will be available in upstream.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/plat-axs10x/axs10x.c b/arch/arc/plat-axs10x/axs10x.c
index f1ac6790da5fe64782b59b720bf3ea80d999bff1..cf14ebc36916a2a0eca39728c0cc0f315d58bbeb 100644 (file)
--- a/arch/arc/plat-axs10x/axs10x.c
+++ b/arch/arc/plat-axs10x/axs10x.c
@@ -111,6 +111,13 @@ static void __init axs10x_early_init(void)
 
        axs10x_enable_gpio_intc_wire();
 
+       /*
+        * Reset ethernet IP core.
+        * TODO: get rid of this quirk after axs10x reset driver (or simple
+        * reset driver) will be available in upstream.
+        */
+       iowrite32((1 << 5), (void __iomem *) CREG_MB_SW_RESET);
+
        scnprintf(mb, 32, "MainBoard v%d", mb_rev);
        axs10x_print_board_ver(CREG_MB_VER, mb);
 }