// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved. */ #include <asm/div64.h> #include "clk.h" #define div_mask(w) ((1 << (w)) - 1) int div_frac_get(unsigned long rate, unsigned parent_rate, u8 width, u8 frac_width, u8 flags) { u64 divider_ux1 = parent_rate; int mul; if (!rate) return 0; mul = 1 << frac_width; if (!(flags & TEGRA_DIVIDER_INT)) divider_ux1 *= mul; if (flags & TEGRA_DIVIDER_ROUND_UP) divider_ux1 += rate - 1; do_div(divider_ux1, rate); if (flags & TEGRA_DIVIDER_INT) divider_ux1 *= mul; if (divider_ux1 < mul) return 0; divider_ux1 -= mul; if (divider_ux1 > div_mask(width)) return div_mask(width); return divider_ux1; }