ARM: tegra: add function to enable input clamping on tristate

[karo-tx-uboot.git] / arch / arm / cpu / tegra-common / pinmux-common.c

diff --git a/arch/arm/cpu/tegra-common/pinmux-common.c b/arch/arm/cpu/tegra-common/pinmux-common.c
index d62618cd0f618230fd01a85766e949e6a61a1554..6e3ab0c14ca2b477451d1b8b0bd7004938daff00 100644 (file)
--- a/arch/arm/cpu/tegra-common/pinmux-common.c
+++ b/arch/arm/cpu/tegra-common/pinmux-common.c
@@ -86,12 +86,31 @@
 #define IO_RESET_SHIFT 8
 #define RCV_SEL_SHIFT  9
 
+#if !defined(CONFIG_TEGRA20) && !defined(CONFIG_TEGRA30)
+/* This register/field only exists on Tegra114 and later */
+#define APB_MISC_PP_PINMUX_GLOBAL_0 0x40
+#define CLAMP_INPUTS_WHEN_TRISTATED 1
+
+void pinmux_set_tristate_input_clamping(void)
+{
+       u32 *reg = _R(APB_MISC_PP_PINMUX_GLOBAL_0);
+       u32 val;
+
+       val = readl(reg);
+       val |= CLAMP_INPUTS_WHEN_TRISTATED;
+       writel(val, reg);
+}
+#endif
+
 void pinmux_set_func(enum pmux_pingrp pin, enum pmux_func func)
 {
        u32 *reg = MUX_REG(pin);
        int i, mux = -1;
        u32 val;
 
+       if (func == PMUX_FUNC_DEFAULT)
+               return;
+
        /* Error check on pin and func */
        assert(pmux_pingrp_isvalid(pin));
        assert(pmux_func_isvalid(func));