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1 | /* |
2 | * File: arch/blackfin/oprofile/common.c | |
3 | * Based on: arch/alpha/oprofile/common.c | |
4 | * Author: Anton Blanchard <anton@au.ibm.com> | |
5 | * | |
6 | * Created: | |
7 | * Description: | |
8 | * | |
9 | * Modified: | |
10 | * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM | |
11 | * Copyright 2004-2006 Analog Devices Inc. | |
12 | * | |
13 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, | |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23 | * GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, see the file COPYING, or write | |
27 | * to the Free Software Foundation, Inc., | |
28 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
29 | */ | |
30 | ||
31 | #include <linux/oprofile.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/smp.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/mutex.h> | |
1f83b8f1 MF |
36 | #include <linux/ptrace.h> |
37 | #include <linux/irq.h> | |
38 | #include <linux/io.h> | |
1394f032 | 39 | |
1394f032 BW |
40 | #include <asm/system.h> |
41 | #include <asm/blackfin.h> | |
1394f032 BW |
42 | |
43 | #include "op_blackfin.h" | |
44 | ||
45 | #define BFIN_533_ID 0xE5040003 | |
46 | #define BFIN_537_ID 0xE5040002 | |
47 | ||
48 | static int pfmon_enabled; | |
49 | static struct mutex pfmon_lock; | |
50 | ||
51 | struct op_bfin533_model *model; | |
52 | ||
53 | struct op_counter_config ctr[OP_MAX_COUNTER]; | |
54 | ||
55 | static int op_bfin_setup(void) | |
56 | { | |
57 | int ret; | |
58 | ||
59 | /* Pre-compute the values to stuff in the hardware registers. */ | |
60 | spin_lock(&oprofilefs_lock); | |
61 | ret = model->reg_setup(ctr); | |
62 | spin_unlock(&oprofilefs_lock); | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
67 | static void op_bfin_shutdown(void) | |
68 | { | |
69 | #if 0 | |
70 | /* what is the difference between shutdown and stop? */ | |
71 | #endif | |
72 | } | |
73 | ||
74 | static int op_bfin_start(void) | |
75 | { | |
76 | int ret = -EBUSY; | |
77 | ||
78 | printk(KERN_INFO "KSDBG:in %s\n", __FUNCTION__); | |
79 | mutex_lock(&pfmon_lock); | |
80 | if (!pfmon_enabled) { | |
81 | ret = model->start(ctr); | |
82 | pfmon_enabled = !ret; | |
83 | } | |
84 | mutex_unlock(&pfmon_lock); | |
85 | ||
86 | return ret; | |
87 | } | |
88 | ||
89 | static void op_bfin_stop(void) | |
90 | { | |
91 | mutex_lock(&pfmon_lock); | |
92 | if (pfmon_enabled) { | |
93 | model->stop(); | |
94 | pfmon_enabled = 0; | |
95 | } | |
96 | mutex_unlock(&pfmon_lock); | |
97 | } | |
98 | ||
99 | static int op_bfin_create_files(struct super_block *sb, struct dentry *root) | |
100 | { | |
101 | int i; | |
102 | ||
103 | for (i = 0; i < model->num_counters; ++i) { | |
104 | struct dentry *dir; | |
105 | char buf[3]; | |
106 | printk(KERN_INFO "Oprofile: creating files... \n"); | |
107 | ||
108 | snprintf(buf, sizeof buf, "%d", i); | |
109 | dir = oprofilefs_mkdir(sb, root, buf); | |
110 | ||
111 | oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled); | |
112 | oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event); | |
113 | oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count); | |
114 | /* | |
115 | * We dont support per counter user/kernel selection, but | |
116 | * we leave the entries because userspace expects them | |
117 | */ | |
118 | oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel); | |
119 | oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user); | |
120 | oprofilefs_create_ulong(sb, dir, "unit_mask", | |
121 | &ctr[i].unit_mask); | |
122 | } | |
123 | ||
124 | return 0; | |
125 | } | |
126 | int __init oprofile_arch_init(struct oprofile_operations *ops) | |
127 | { | |
128 | #ifdef CONFIG_HARDWARE_PM | |
129 | unsigned int dspid; | |
130 | ||
131 | mutex_init(&pfmon_lock); | |
132 | ||
133 | dspid = bfin_read_DSPID(); | |
134 | ||
135 | printk(KERN_INFO "Oprofile got the cpu id is 0x%x. \n", dspid); | |
136 | ||
137 | switch (dspid) { | |
138 | case BFIN_533_ID: | |
139 | model = &op_model_bfin533; | |
140 | model->num_counters = 2; | |
141 | break; | |
142 | case BFIN_537_ID: | |
143 | model = &op_model_bfin533; | |
144 | model->num_counters = 2; | |
145 | break; | |
146 | default: | |
147 | return -ENODEV; | |
148 | } | |
149 | ||
150 | ops->cpu_type = model->name; | |
151 | ops->create_files = op_bfin_create_files; | |
152 | ops->setup = op_bfin_setup; | |
153 | ops->shutdown = op_bfin_shutdown; | |
154 | ops->start = op_bfin_start; | |
155 | ops->stop = op_bfin_stop; | |
156 | ||
157 | printk(KERN_INFO "oprofile: using %s performance monitoring.\n", | |
158 | ops->cpu_type); | |
159 | ||
160 | return 0; | |
161 | #else | |
162 | return -1; | |
163 | #endif | |
164 | } | |
165 | ||
166 | void oprofile_arch_exit(void) | |
167 | { | |
168 | } |