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41 lines
853 B
41 lines
853 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* SH-Mobile Timer |
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* |
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* Copyright (C) 2010 Magnus Damm |
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* Copyright (C) 2002 - 2009 Paul Mundt |
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*/ |
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#include <linux/platform_device.h> |
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#include <linux/clocksource.h> |
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#include <linux/delay.h> |
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#include <linux/of_address.h> |
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#include "common.h" |
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void __init shmobile_init_delay(void) |
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{ |
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struct device_node *np; |
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u32 max_freq = 0; |
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for_each_of_cpu_node(np) { |
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u32 freq; |
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if (!of_property_read_u32(np, "clock-frequency", &freq)) |
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max_freq = max(max_freq, freq); |
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} |
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if (!max_freq) |
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return; |
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/* |
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* Calculate a worst-case loops-per-jiffy value |
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* based on maximum cpu core hz setting and the |
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* __delay() implementation in arch/arm/lib/delay.S. |
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* |
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* This will result in a longer delay than expected |
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* when the cpu core runs on lower frequencies. |
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*/ |
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if (!preset_lpj) |
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preset_lpj = max_freq / HZ; |
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}
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