2 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com/
5 * EXYNOS - PPMU support
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.
12 #include <linux/kernel.h>
13 #include <linux/types.h>
16 #include "exynos_ppmu.h"
18 void exynos_ppmu_reset(void __iomem *ppmu_base)
20 __raw_writel(PPMU_CYCLE_RESET | PPMU_COUNTER_RESET, ppmu_base);
21 __raw_writel(PPMU_ENABLE_CYCLE |
26 ppmu_base + PPMU_CNTENS);
29 void exynos_ppmu_setevent(void __iomem *ppmu_base, unsigned int ch,
32 __raw_writel(evt, ppmu_base + PPMU_BEVTSEL(ch));
35 void exynos_ppmu_start(void __iomem *ppmu_base)
37 __raw_writel(PPMU_ENABLE, ppmu_base);
40 void exynos_ppmu_stop(void __iomem *ppmu_base)
42 __raw_writel(PPMU_DISABLE, ppmu_base);
45 unsigned int exynos_ppmu_read(void __iomem *ppmu_base, unsigned int ch)
49 if (ch == PPMU_PMNCNT3)
50 total = ((__raw_readl(ppmu_base + PMCNT_OFFSET(ch)) << 8) |
51 __raw_readl(ppmu_base + PMCNT_OFFSET(ch + 1)));
53 total = __raw_readl(ppmu_base + PMCNT_OFFSET(ch));
58 void busfreq_mon_reset(struct busfreq_ppmu_data *ppmu_data)
62 for (i = 0; i < ppmu_data->ppmu_end; i++) {
63 void __iomem *ppmu_base = ppmu_data->ppmu[i].hw_base;
65 /* Reset the performance and cycle counters */
66 exynos_ppmu_reset(ppmu_base);
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]);
73 exynos_ppmu_start(ppmu_base);
77 void exynos_read_ppmu(struct busfreq_ppmu_data *ppmu_data)
81 for (i = 0; i < ppmu_data->ppmu_end; i++) {
82 void __iomem *ppmu_base = ppmu_data->ppmu[i].hw_base;
84 exynos_ppmu_stop(ppmu_base);
86 /* Update local data from PPMU */
87 ppmu_data->ppmu[i].ccnt = __raw_readl(ppmu_base + PPMU_CCNT);
89 for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
90 if (ppmu_data->ppmu[i].event[j] == 0)
91 ppmu_data->ppmu[i].count[j] = 0;
93 ppmu_data->ppmu[i].count[j] =
94 exynos_ppmu_read(ppmu_base, j);
98 busfreq_mon_reset(ppmu_data);
101 int exynos_get_busier_ppmu(struct busfreq_ppmu_data *ppmu_data)
103 unsigned int count = 0;
106 for (i = 0; i < ppmu_data->ppmu_end; i++) {
107 for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
108 if (ppmu_data->ppmu[i].count[j] > count) {
109 count = ppmu_data->ppmu[i].count[j];