Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
44 lines
733 B
C
44 lines
733 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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*/
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#include <asm/div64.h>
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#include "clk.h"
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#define div_mask(w) ((1 << (w)) - 1)
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int div_frac_get(unsigned long rate, unsigned parent_rate, u8 width,
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u8 frac_width, u8 flags)
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{
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u64 divider_ux1 = parent_rate;
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int mul;
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if (!rate)
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return 0;
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mul = 1 << frac_width;
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if (!(flags & TEGRA_DIVIDER_INT))
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divider_ux1 *= mul;
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if (flags & TEGRA_DIVIDER_ROUND_UP)
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divider_ux1 += rate - 1;
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do_div(divider_ux1, rate);
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if (flags & TEGRA_DIVIDER_INT)
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divider_ux1 *= mul;
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if (divider_ux1 < mul)
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return 0;
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divider_ux1 -= mul;
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if (divider_ux1 > div_mask(width))
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return div_mask(width);
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return divider_ux1;
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}
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