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bsp/powerpc: Move libcpu timer to bsps

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Use only one timer driver variant based on the standard PowerPC time
base.

This patch is a part of the BSP source reorganization.

Update #3285.
This commit is contained in:
Sebastian Huber
2018-03-21 06:27:24 +01:00
parent f3a51d62e9
commit bb22a3f3af
29 changed files with 28 additions and 524 deletions
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88
bsps/powerpc/shared/ppc-dec-timer.c Normal file
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/**
* @file
* @brief
*
* This file implements a benchmark timer using the PPC Timebase Register.
*/
/*
* COPYRIGHT (c) 1989-2014.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may in
* the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp.h>
#include <rtems.h>
#include <rtems/system.h>
#include <rtems/btimer.h>
#include <assert.h>
#include <libcpu/powerpc-utility.h>
#ifndef BSP_Convert_decrementer
#define BSP_Convert_decrementer(value) (value)
#endif
uint64_t Timer_driver_Start_time;
bool benchmark_timer_find_average_overhead = false;
unsigned clicks_overhead = 0;
/*
* Timer Get overhead
*/
static int Timer_get_clicks_overhead(void)
{
uint64_t clicks;
PPC_Set_timebase_register((uint64_t) 0);
clicks = PPC_Get_timebase_register();
assert(clicks <= 0xffffffff);
clicks_overhead = (unsigned) clicks;
return clicks_overhead;
}
/*
* benchmark_timer_initialize
*/
void benchmark_timer_initialize(void)
{
/*
* Timer runs long and accurate enough not to require an interrupt.
*/
if (clicks_overhead == 0) clicks_overhead = Timer_get_clicks_overhead();
PPC_Set_timebase_register((uint64_t) 0);
}
/*
* benchmark_timer_read
*/
benchmark_timer_t benchmark_timer_read(void)
{
uint64_t total64;
uint32_t total;
/* approximately CLOCK_SPEED clicks per microsecond */
total64 = PPC_Get_timebase_register();
assert( total64 <= 0xffffffff ); /* fits into a uint32_t */
total = (uint32_t) total64;
if ( benchmark_timer_find_average_overhead == true )
return total; /* in "clicks" of the decrementer units */
return (int) BSP_Convert_decrementer(total - clicks_overhead);
}
void benchmark_timer_disable_subtracting_average_overhead(bool find_flag)
{
benchmark_timer_find_average_overhead = find_flag;
}

104
bsps/powerpc/ss555/dev/timer.c
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@@ -1,104 +0,0 @@
/**
* @file
* @brief Timer Driver for the PowerPC MPC5xx.
*
* This file manages the interval timer on the PowerPC MPC5xx.
* @noe This is not the PIT, but rather the RTEMS interval timer.
* We shall use the bottom 32 bits of the timebase register,
*/
/*
* MPC5xx port sponsored by Defence Research and Development Canada - Suffield
* Copyright (C) 2004, Real-Time Systems Inc. (querbach@realtime.bc.ca)
*
* Derived from c/src/lib/libcpu/powerpc/mpc8xx/timer/timer.c:
*
* Author: Jay Monkman (jmonkman@frasca.com)
* Copywright (C) 1998 by Frasca International, Inc.
*
* Derived from c/src/lib/libcpu/ppc/ppc403/timer/timer.c:
*
* Author: Andrew Bray <andy@i-cubed.co.uk>
*
* COPYRIGHT (c) 1995 by i-cubed ltd.
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
* permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies, and that the name of i-cubed limited not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* i-cubed limited makes no representations about the suitability
* of this software for any purpose.
*
* Derived from c/src/lib/libcpu/hppa1_1/timer/timer.c:
*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <rtems.h>
#include <rtems/btimer.h>
#include <mpc5xx.h>
static volatile uint32_t Timer_starting;
static bool benchmark_timer_find_average_overhead;
extern uint32_t bsp_timer_least_valid;
extern uint32_t bsp_timer_average_overhead;
/*
* This is so small that this code will be reproduced where needed.
*/
static inline uint32_t get_itimer(void)
{
uint32_t ret;
__asm__ volatile ("mftb %0" : "=r" ((ret))); /* TBLO */
return ret;
}
void benchmark_timer_initialize(void)
{
/* set interrupt level and enable timebase. This should never */
/* generate an interrupt however. */
usiu.tbscrk = USIU_UNLOCK_KEY;
usiu.tbscr |= USIU_TBSCR_TBIRQ(4) /* interrupt priority level */
| USIU_TBSCR_TBF /* freeze timebase during debug */
| USIU_TBSCR_TBE; /* enable timebase */
usiu.tbscrk = 0;
Timer_starting = get_itimer();
}
benchmark_timer_t benchmark_timer_read(void)
{
uint32_t clicks;
uint32_t total;
clicks = get_itimer();
total = clicks - Timer_starting;
if ( benchmark_timer_find_average_overhead == 1 )
return total; /* in XXX microsecond units */
else {
if ( total < bsp_timer_least_valid ) {
return 0; /* below timer resolution */
}
return (total - bsp_timer_average_overhead);
}
}
void benchmark_timer_disable_subtracting_average_overhead(bool find_flag)
{
benchmark_timer_find_average_overhead = find_flag;
}