summaryrefslogtreecommitdiffstats
path: root/arch/blackfin/oprofile/op_model_bf533.c
blob: 872dffe3362360f6eb1e46e4d9d53961d04c359e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
/*
 * File:         arch/blackfin/oprofile/op_model_bf533.c
 * Based on:
 * Author:       Anton Blanchard <anton@au.ibm.com>
 *
 * Created:
 * Description:
 *
 * Modified:
 *               Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/oprofile.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/blackfin.h>

#include "op_blackfin.h"

#define PM_ENABLE 0x01;
#define PM_CTL1_ENABLE  0x18
#define PM_CTL0_ENABLE  0xC000
#define COUNT_EDGE_ONLY 0x3000000

static int oprofile_running;

static unsigned curr_pfctl, curr_count[2];

static int bfin533_reg_setup(struct op_counter_config *ctr)
{
	unsigned int pfctl = ctr_read();
	unsigned int count[2];

	/* set Blackfin perf monitor regs with ctr */
	if (ctr[0].enabled) {
		pfctl |= (PM_CTL0_ENABLE | ((char)ctr[0].event << 5));
		count[0] = 0xFFFFFFFF - ctr[0].count;
		curr_count[0] = count[0];
	}
	if (ctr[1].enabled) {
		pfctl |= (PM_CTL1_ENABLE | ((char)ctr[1].event << 16));
		count[1] = 0xFFFFFFFF - ctr[1].count;
		curr_count[1] = count[1];
	}

	pr_debug("ctr[0].enabled=%d,ctr[1].enabled=%d,ctr[0].event<<5=0x%x,ctr[1].event<<16=0x%x\n", ctr[0].enabled, ctr[1].enabled, ctr[0].event << 5, ctr[1].event << 16);
	pfctl |= COUNT_EDGE_ONLY;
	curr_pfctl = pfctl;

	pr_debug("write 0x%x to pfctl\n", pfctl);
	ctr_write(pfctl);
	count_write(count);

	return 0;
}

static int bfin533_start(struct op_counter_config *ctr)
{
	unsigned int pfctl = ctr_read();

	pfctl |= PM_ENABLE;
	curr_pfctl = pfctl;

	ctr_write(pfctl);

	oprofile_running = 1;
	pr_debug("start oprofile counter \n");

	return 0;
}

static void bfin533_stop(void)
{
	int pfctl;

	pfctl = ctr_read();
	pfctl &= ~PM_ENABLE;
	/* freeze counters */
	ctr_write(pfctl);

	oprofile_running = 0;
	pr_debug("stop oprofile counter \n");
}

static int get_kernel(void)
{
	int ipend, is_kernel;

	ipend = bfin_read_IPEND();

	/* test bit 15 */
	is_kernel = ((ipend & 0x8000) != 0);

	return is_kernel;
}

int pm_overflow_handler(int irq, struct pt_regs *regs)
{
	int is_kernel;
	int i, cpu;
	unsigned int pc, pfctl;
	unsigned int count[2];

	pr_debug("get interrupt in %s\n", __FUNCTION__);
	if (oprofile_running == 0) {
		pr_debug("error: entering interrupt when oprofile is stopped.\n\r");
		return -1;
	}

	is_kernel = get_kernel();
	cpu = smp_processor_id();
	pc = regs->pc;
	pfctl = ctr_read();

	/* read the two event counter regs */
	count_read(count);

	/* if the counter overflows, add sample to oprofile buffer */
	for (i = 0; i < 2; ++i) {
		if (oprofile_running) {
			oprofile_add_sample(regs, i);
		}
	}

	/* reset the perfmon counter */
	ctr_write(curr_pfctl);
	count_write(curr_count);
	return 0;
}

struct op_bfin533_model op_model_bfin533 = {
	.reg_setup = bfin533_reg_setup,
	.start = bfin533_start,
	.stop = bfin533_stop,
	.num_counters = 2,
	.name = "blackfin/bf533"
};