1/*
  2 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  3 *		http://www.samsung.com/
  4 *
  5 * EXYNOS - PPMU support
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 */
 11
 12#include <linux/kernel.h>
 13#include <linux/types.h>
 14#include <linux/io.h>
 15
 16#include "exynos_ppmu.h"
 17
 18void exynos_ppmu_reset(void __iomem *ppmu_base)
 19{
 20	__raw_writel(PPMU_CYCLE_RESET | PPMU_COUNTER_RESET, ppmu_base);
 21	__raw_writel(PPMU_ENABLE_CYCLE  |
 22		     PPMU_ENABLE_COUNT0 |
 23		     PPMU_ENABLE_COUNT1 |
 24		     PPMU_ENABLE_COUNT2 |
 25		     PPMU_ENABLE_COUNT3,
 26		     ppmu_base + PPMU_CNTENS);
 27}
 28
 29void exynos_ppmu_setevent(void __iomem *ppmu_base, unsigned int ch,
 30			unsigned int evt)
 31{
 32	__raw_writel(evt, ppmu_base + PPMU_BEVTSEL(ch));
 33}
 34
 35void exynos_ppmu_start(void __iomem *ppmu_base)
 36{
 37	__raw_writel(PPMU_ENABLE, ppmu_base);
 38}
 39
 40void exynos_ppmu_stop(void __iomem *ppmu_base)
 41{
 42	__raw_writel(PPMU_DISABLE, ppmu_base);
 43}
 44
 45unsigned int exynos_ppmu_read(void __iomem *ppmu_base, unsigned int ch)
 46{
 47	unsigned int total;
 48
 49	if (ch == PPMU_PMNCNT3)
 50		total = ((__raw_readl(ppmu_base + PMCNT_OFFSET(ch)) << 8) |
 51			  __raw_readl(ppmu_base + PMCNT_OFFSET(ch + 1)));
 52	else
 53		total = __raw_readl(ppmu_base + PMCNT_OFFSET(ch));
 54
 55	return total;
 56}
 57
 58void busfreq_mon_reset(struct busfreq_ppmu_data *ppmu_data)
 59{
 60	unsigned int i;
 61
 62	for (i = 0; i < ppmu_data->ppmu_end; i++) {
 63		void __iomem *ppmu_base = ppmu_data->ppmu[i].hw_base;
 64
 65		/* Reset the performance and cycle counters */
 66		exynos_ppmu_reset(ppmu_base);
 67
 68		/* Setup count registers to monitor read/write transactions */
 69		ppmu_data->ppmu[i].event[PPMU_PMNCNT3] = RDWR_DATA_COUNT;
 70		exynos_ppmu_setevent(ppmu_base, PPMU_PMNCNT3,
 71					ppmu_data->ppmu[i].event[PPMU_PMNCNT3]);
 72
 73		exynos_ppmu_start(ppmu_base);
 74	}
 75}
 76EXPORT_SYMBOL(busfreq_mon_reset);
 77
 78void exynos_read_ppmu(struct busfreq_ppmu_data *ppmu_data)
 79{
 80	int i, j;
 81
 82	for (i = 0; i < ppmu_data->ppmu_end; i++) {
 83		void __iomem *ppmu_base = ppmu_data->ppmu[i].hw_base;
 84
 85		exynos_ppmu_stop(ppmu_base);
 86
 87		/* Update local data from PPMU */
 88		ppmu_data->ppmu[i].ccnt = __raw_readl(ppmu_base + PPMU_CCNT);
 89
 90		for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
 91			if (ppmu_data->ppmu[i].event[j] == 0)
 92				ppmu_data->ppmu[i].count[j] = 0;
 93			else
 94				ppmu_data->ppmu[i].count[j] =
 95					exynos_ppmu_read(ppmu_base, j);
 96		}
 97	}
 98
 99	busfreq_mon_reset(ppmu_data);
100}
101EXPORT_SYMBOL(exynos_read_ppmu);
102
103int exynos_get_busier_ppmu(struct busfreq_ppmu_data *ppmu_data)
104{
105	unsigned int count = 0;
106	int i, j, busy = 0;
107
108	for (i = 0; i < ppmu_data->ppmu_end; i++) {
109		for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
110			if (ppmu_data->ppmu[i].count[j] > count) {
111				count = ppmu_data->ppmu[i].count[j];
112				busy = i;
113			}
114		}
115	}
116
117	return busy;
118}
119EXPORT_SYMBOL(exynos_get_busier_ppmu);