ARM: tegra: add APIs the clock uclass driver will need

[u-boot] / arch / arm / mach-tegra / clock.c

diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
index 597f6286d6c1c50f0a566da29cdfd913ccb63bf3..cf8bc38925d200cbcd49416a926e4481e73aa4d1 100644 (file)
--- a/arch/arm/mach-tegra/clock.c
+++ b/arch/arm/mach-tegra/clock.c
@@ -206,6 +206,29 @@ int clock_ll_set_source_bits(enum periph_id periph_id, int mux_bits,
        return 0;
 }
 
+static int clock_ll_get_source_bits(enum periph_id periph_id, int mux_bits)
+{
+       u32 *reg = get_periph_source_reg(periph_id);
+       u32 val = readl(reg);
+
+       switch (mux_bits) {
+       case MASK_BITS_31_30:
+               val >>= OUT_CLK_SOURCE_31_30_SHIFT;
+               val &= OUT_CLK_SOURCE_31_30_MASK;
+               return val;
+       case MASK_BITS_31_29:
+               val >>= OUT_CLK_SOURCE_31_29_SHIFT;
+               val &= OUT_CLK_SOURCE_31_29_MASK;
+               return val;
+       case MASK_BITS_31_28:
+               val >>= OUT_CLK_SOURCE_31_28_SHIFT;
+               val &= OUT_CLK_SOURCE_31_28_MASK;
+               return val;
+       default:
+               return -1;
+       }
+}
+
 void clock_ll_set_source(enum periph_id periph_id, unsigned source)
 {
        clock_ll_set_source_bits(periph_id, MASK_BITS_31_30, source);
@@ -363,6 +386,20 @@ static int adjust_periph_pll(enum periph_id periph_id, int source,
        return 0;
 }
 
+enum clock_id clock_get_periph_parent(enum periph_id periph_id)
+{
+       int err, mux_bits, divider_bits, type;
+       int source;
+
+       err = get_periph_clock_info(periph_id, &mux_bits, &divider_bits, &type);
+       if (err)
+               return CLOCK_ID_NONE;
+
+       source = clock_ll_get_source_bits(periph_id, mux_bits);
+
+       return get_periph_clock_id(periph_id, source);
+}
+
 unsigned clock_adjust_periph_pll_div(enum periph_id periph_id,
                enum clock_id parent, unsigned rate, int *extra_div)
 {