6ccce69955
Exynos5-bus device devfreq driver monitors PPMU counters and adjusts operating frequencies and voltages with OPP. ASV should be used to provide appropriate voltages as per the speed group of the SoC rather than using a constant 1.025V. Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com> [myungjoo.ham@samsung.com: minor style update] Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Cc: Jonghwan Choi <jhbird.choi@samsung.com> Cc: Kukjin Kim <kgene.kim@samsung.com>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* EXYNOS - PPMU support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/io.h>
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#include "exynos_ppmu.h"
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void exynos_ppmu_reset(void __iomem *ppmu_base)
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{
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__raw_writel(PPMU_CYCLE_RESET | PPMU_COUNTER_RESET, ppmu_base);
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__raw_writel(PPMU_ENABLE_CYCLE |
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PPMU_ENABLE_COUNT0 |
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PPMU_ENABLE_COUNT1 |
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PPMU_ENABLE_COUNT2 |
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PPMU_ENABLE_COUNT3,
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ppmu_base + PPMU_CNTENS);
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}
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void exynos_ppmu_setevent(void __iomem *ppmu_base, unsigned int ch,
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unsigned int evt)
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{
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__raw_writel(evt, ppmu_base + PPMU_BEVTSEL(ch));
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}
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void exynos_ppmu_start(void __iomem *ppmu_base)
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{
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__raw_writel(PPMU_ENABLE, ppmu_base);
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}
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void exynos_ppmu_stop(void __iomem *ppmu_base)
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{
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__raw_writel(PPMU_DISABLE, ppmu_base);
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}
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unsigned int exynos_ppmu_read(void __iomem *ppmu_base, unsigned int ch)
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{
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unsigned int total;
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if (ch == PPMU_PMNCNT3)
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total = ((__raw_readl(ppmu_base + PMCNT_OFFSET(ch)) << 8) |
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__raw_readl(ppmu_base + PMCNT_OFFSET(ch + 1)));
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else
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total = __raw_readl(ppmu_base + PMCNT_OFFSET(ch));
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return total;
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}
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