tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}
76
77void exynos_read_ppmu(struct busfreq_ppmu_data *ppmu_data)
78{
79 int i, j;
80
81 for (i = 0; i < ppmu_data->ppmu_end; i++) {
82 void __iomem *ppmu_base = ppmu_data->ppmu[i].hw_base;
83
84 exynos_ppmu_stop(ppmu_base);
85
86 /* Update local data from PPMU */
87 ppmu_data->ppmu[i].ccnt = __raw_readl(ppmu_base + PPMU_CCNT);
88
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;
92 else
93 ppmu_data->ppmu[i].count[j] =
94 exynos_ppmu_read(ppmu_base, j);
95 }
96 }
97
98 busfreq_mon_reset(ppmu_data);
99}
100
101int exynos_get_busier_ppmu(struct busfreq_ppmu_data *ppmu_data)
102{
103 unsigned int count = 0;
104 int i, j, busy = 0;
105
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];
110 busy = i;
111 }
112 }
113 }
114
115 return busy;
116}