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43 lines
733 B
43 lines
733 B
// 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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