diff options
Diffstat (limited to 'arch/arm/mach-tegra/clock.c')
| -rw-r--r-- | arch/arm/mach-tegra/clock.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c index 597f6286d6..cf8bc38925 100644 --- 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, ÷r_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) { |