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
exynos_ppmu_reset(void __iomem * ppmu_base)18 void 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
exynos_ppmu_setevent(void __iomem * ppmu_base,unsigned int ch,unsigned int evt)29 void 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
exynos_ppmu_start(void __iomem * ppmu_base)35 void exynos_ppmu_start(void __iomem *ppmu_base)
36 {
37 __raw_writel(PPMU_ENABLE, ppmu_base);
38 }
39
exynos_ppmu_stop(void __iomem * ppmu_base)40 void exynos_ppmu_stop(void __iomem *ppmu_base)
41 {
42 __raw_writel(PPMU_DISABLE, ppmu_base);
43 }
44
exynos_ppmu_read(void __iomem * ppmu_base,unsigned int ch)45 unsigned 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
busfreq_mon_reset(struct busfreq_ppmu_data * ppmu_data)58 void 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 EXPORT_SYMBOL(busfreq_mon_reset);
77
exynos_read_ppmu(struct busfreq_ppmu_data * ppmu_data)78 void 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 }
101 EXPORT_SYMBOL(exynos_read_ppmu);
102
exynos_get_busier_ppmu(struct busfreq_ppmu_data * ppmu_data)103 int 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 }
119 EXPORT_SYMBOL(exynos_get_busier_ppmu);
120