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/*
* oprofile/op_model_e500.c
*
* Freescale Book-E oprofile support, based on ppc64 oprofile support
* Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
*
* Copyright (c) 2004 Freescale Semiconductor, Inc
*
* Author: Andy Fleming
* Maintainer: Kumar Gala <Kumar.Gala@freescale.com>
*
* 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.
*/
#include <linux/oprofile.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/reg_booke.h>
#include <asm/page.h>
#include <asm/perfmon.h>
#include <asm/oprofile_impl.h>
static unsigned long reset_value[OP_MAX_COUNTER];
static int num_counters;
static int oprofile_running;
static inline unsigned int ctr_read(unsigned int i)
{
switch(i) {
case 0:
return mfpmr(PMRN_PMC0);
case 1:
return mfpmr(PMRN_PMC1);
case 2:
return mfpmr(PMRN_PMC2);
case 3:
return mfpmr(PMRN_PMC3);
default:
return 0;
}
}
static inline void ctr_write(unsigned int i, unsigned int val)
{
switch(i) {
case 0:
mtpmr(PMRN_PMC0, val);
break;
case 1:
mtpmr(PMRN_PMC1, val);
break;
case 2:
mtpmr(PMRN_PMC2, val);
break;
case 3:
mtpmr(PMRN_PMC3, val);
break;
default:
break;
}
}
static void fsl_booke_reg_setup(struct op_counter_config *ctr,
struct op_system_config *sys,
int num_ctrs)
{
int i;
num_counters = num_ctrs;
/* freeze all counters */
pmc_stop_ctrs();
/* Our counters count up, and "count" refers to
* how much before the next interrupt, and we interrupt
* on overflow. So we calculate the starting value
* which will give us "count" until overflow.
* Then we set the events on the enabled counters */
for (i = 0; i < num_counters; ++i) {
reset_value[i] = 0x80000000UL - ctr[i].count;
init_pmc_stop(i);
set_pmc_event(i, ctr[i].event);
set_pmc_user_kernel(i, ctr[i].user, ctr[i].kernel);
}
}
static void fsl_booke_start(struct op_counter_config *ctr)
{
int i;
mtmsr(mfmsr() | MSR_PMM);
for (i = 0; i < num_counters; ++i) {
if (ctr[i].enabled) {
ctr_write(i, reset_value[i]);
/* Set Each enabled counterd to only
* count when the Mark bit is not set */
set_pmc_marked(i, 1, 0);
pmc_start_ctr(i, 1);
} else {
ctr_write(i, 0);
/* Set the ctr to be stopped */
pmc_start_ctr(i, 0);
}
}
/* Clear the freeze bit, and enable the interrupt.
* The counters won't actually start until the rfi clears
* the PMM bit */
pmc_start_ctrs(1);
oprofile_running = 1;
pr_debug("start on cpu %d, pmgc0 %x\n", smp_processor_id(),
mfpmr(PMRN_PMGC0));
}
static void fsl_booke_stop(void)
{
/* freeze counters */
pmc_stop_ctrs();
oprofile_running = 0;
pr_debug("stop on cpu %d, pmgc0 %x\n", smp_processor_id(),
mfpmr(PMRN_PMGC0));
mb();
}
static void fsl_booke_handle_interrupt(struct pt_regs *regs,
struct op_counter_config *ctr)
{
unsigned long pc;
int is_kernel;
int val;
int i;
/* set the PMM bit (see comment below) */
mtmsr(mfmsr() | MSR_PMM);
pc = regs->nip;
is_kernel = (pc >= KERNELBASE);
for (i = 0; i < num_counters; ++i) {
val = ctr_read(i);
if (val < 0) {
if (oprofile_running && ctr[i].enabled) {
oprofile_add_pc(pc, is_kernel, i);
ctr_write(i, reset_value[i]);
} else {
ctr_write(i, 0);
}
}
}
/* The freeze bit was set by the interrupt. */
/* Clear the freeze bit, and reenable the interrupt.
* The counters won't actually start until the rfi clears
* the PMM bit */
pmc_start_ctrs(1);
}
struct op_powerpc_model op_model_fsl_booke = {
.reg_setup = fsl_booke_reg_setup,
.start = fsl_booke_start,
.stop = fsl_booke_stop,
.handle_interrupt = fsl_booke_handle_interrupt,
};
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