arch/arm/oprofile/op_model_v6.c

   1 /**
   2  * @file op_model_v6.c
   3  * ARM11 Performance Monitor Driver
   4  *
   5  * Based on op_model_xscale.c
   6  *
   7  * @remark Copyright 2000-2004 Deepak Saxena <dsaxena@mvista.com>
   8  * @remark Copyright 2000-2004 MontaVista Software Inc
   9  * @remark Copyright 2004 Dave Jiang <dave.jiang@intel.com>
  10  * @remark Copyright 2004 Intel Corporation
  11  * @remark Copyright 2004 Zwane Mwaikambo <zwane@arm.linux.org.uk>
  12  * @remark Copyright 2004 OProfile Authors
  13  *
  14  * @remark Read the file COPYING
  15  *
  16  * @author Tony Lindgren <tony@atomide.com>
  17  */
  18
  19 /* #define DEBUG */
  20 #include <linux/types.h>
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/sched.h>
  24 #include <linux/oprofile.h>
  25 #include <linux/interrupt.h>
  26 #include <asm/irq.h>
  27 #include <asm/system.h>
  28 #include <asm/pmu.h>
  29
  30 #include "op_counter.h"
  31 #include "op_arm_model.h"
  32 #include "op_model_arm11_core.h"
  33
  34 static const struct pmu_irqs *pmu_irqs;
  35
  36 static void armv6_pmu_stop(void)
  37 {
  38         arm11_stop_pmu();
  39         arm11_release_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
  40         release_pmu(pmu_irqs);
  41         pmu_irqs = NULL;
  42 }
  43
  44 static int armv6_pmu_start(void)
  45 {
  46         int ret;
  47
  48         pmu_irqs = reserve_pmu();
  49         if (IS_ERR(pmu_irqs)) {
  50                 ret = PTR_ERR(pmu_irqs);
  51                 goto out;
  52         }
  53
  54         ret = arm11_request_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
  55         if (ret >= 0) {
  56                 ret = arm11_start_pmu();
  57         } else {
  58                 release_pmu(pmu_irqs);
  59                 pmu_irqs = NULL;
  60         }
  61
  62 out:
  63         return ret;
  64 }
  65
  66 static int armv6_detect_pmu(void)
  67 {
  68         return 0;
  69 }
  70
  71 struct op_arm_model_spec op_armv6_spec = {
  72         .init           = armv6_detect_pmu,
  73         .num_counters   = 3,
  74         .setup_ctrs     = arm11_setup_pmu,
  75         .start          = armv6_pmu_start,
  76         .stop           = armv6_pmu_stop,
  77         .name           = "arm/armv6",
  78 };