arch/blackfin/oprofile/op_model_bf533.c

   1 /*
   2  * File:         arch/blackfin/oprofile/op_model_bf533.c
   3  * Based on:
   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/interrupt.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/irq.h>
  37 #include <linux/io.h>
  38 #include <asm/system.h>
  39 #include <asm/processor.h>
  40 #include <asm/blackfin.h>
  41
  42 #include "op_blackfin.h"
  43
  44 #define PM_ENABLE 0x01;
  45 #define PM_CTL1_ENABLE  0x18
  46 #define PM_CTL0_ENABLE  0xC000
  47 #define COUNT_EDGE_ONLY 0x3000000
  48
  49 static int oprofile_running;
  50
  51 static unsigned curr_pfctl, curr_count[2];
  52
  53 static int bfin533_reg_setup(struct op_counter_config *ctr)
  54 {
  55         unsigned int pfctl = ctr_read();
  56         unsigned int count[2];
  57
  58         /* set Blackfin perf monitor regs with ctr */
  59         if (ctr[0].enabled) {
  60                 pfctl |= (PM_CTL0_ENABLE | ((char)ctr[0].event << 5));
  61                 count[0] = 0xFFFFFFFF - ctr[0].count;
  62                 curr_count[0] = count[0];
  63         }
  64         if (ctr[1].enabled) {
  65                 pfctl |= (PM_CTL1_ENABLE | ((char)ctr[1].event << 16));
  66                 count[1] = 0xFFFFFFFF - ctr[1].count;
  67                 curr_count[1] = count[1];
  68         }
  69
  70         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);
  71         pfctl |= COUNT_EDGE_ONLY;
  72         curr_pfctl = pfctl;
  73
  74         pr_debug("write 0x%x to pfctl\n", pfctl);
  75         ctr_write(pfctl);
  76         count_write(count);
  77
  78         return 0;
  79 }
  80
  81 static int bfin533_start(struct op_counter_config *ctr)
  82 {
  83         unsigned int pfctl = ctr_read();
  84
  85         pfctl |= PM_ENABLE;
  86         curr_pfctl = pfctl;
  87
  88         ctr_write(pfctl);
  89
  90         oprofile_running = 1;
  91         pr_debug("start oprofile counter \n");
  92
  93         return 0;
  94 }
  95
  96 static void bfin533_stop(void)
  97 {
  98         int pfctl;
  99
 100         pfctl = ctr_read();
 101         pfctl &= ~PM_ENABLE;
 102         /* freeze counters */
 103         ctr_write(pfctl);
 104
 105         oprofile_running = 0;
 106         pr_debug("stop oprofile counter \n");
 107 }
 108
 109 static int get_kernel(void)
 110 {
 111         int ipend, is_kernel;
 112
 113         ipend = bfin_read_IPEND();
 114
 115         /* test bit 15 */
 116         is_kernel = ((ipend & 0x8000) != 0);
 117
 118         return is_kernel;
 119 }
 120
 121 int pm_overflow_handler(int irq, struct pt_regs *regs)
 122 {
 123         int is_kernel;
 124         int i, cpu;
 125         unsigned int pc, pfctl;
 126         unsigned int count[2];
 127
 128         pr_debug("get interrupt in %s\n", __func__);
 129         if (oprofile_running == 0) {
 130                 pr_debug("error: entering interrupt when oprofile is stopped.\n\r");
 131                 return -1;
 132         }
 133
 134         is_kernel = get_kernel();
 135         cpu = smp_processor_id();
 136         pc = regs->pc;
 137         pfctl = ctr_read();
 138
 139         /* read the two event counter regs */
 140         count_read(count);
 141
 142         /* if the counter overflows, add sample to oprofile buffer */
 143         for (i = 0; i < 2; ++i) {
 144                 if (oprofile_running) {
 145                         oprofile_add_sample(regs, i);
 146                 }
 147         }
 148
 149         /* reset the perfmon counter */
 150         ctr_write(curr_pfctl);
 151         count_write(curr_count);
 152         return 0;
 153 }
 154
 155 struct op_bfin533_model op_model_bfin533 = {
 156         .reg_setup = bfin533_reg_setup,
 157         .start = bfin533_start,
 158         .stop = bfin533_stop,
 159         .num_counters = 2,
 160         .name = "blackfin/bf533"
 161 };