mirror of
https://github.com/brain-hackers/linux-brain.git
synced 2024-06-09 23:36:23 +09:00
c942fddf87
Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (C) 2000, 2001 Broadcom Corporation
|
|
*/
|
|
#include <linux/clocksource.h>
|
|
#include <linux/sched_clock.h>
|
|
|
|
#include <asm/addrspace.h>
|
|
#include <asm/io.h>
|
|
#include <asm/time.h>
|
|
|
|
#include <asm/sibyte/sb1250.h>
|
|
#include <asm/sibyte/sb1250_regs.h>
|
|
#include <asm/sibyte/sb1250_int.h>
|
|
#include <asm/sibyte/sb1250_scd.h>
|
|
|
|
#define SB1250_HPT_NUM 3
|
|
#define SB1250_HPT_VALUE M_SCD_TIMER_CNT /* max value */
|
|
|
|
/*
|
|
* The HPT is free running from SB1250_HPT_VALUE down to 0 then starts over
|
|
* again.
|
|
*/
|
|
static inline u64 sb1250_hpt_get_cycles(void)
|
|
{
|
|
unsigned int count;
|
|
void __iomem *addr;
|
|
|
|
addr = IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM, R_SCD_TIMER_CNT));
|
|
count = G_SCD_TIMER_CNT(__raw_readq(addr));
|
|
|
|
return SB1250_HPT_VALUE - count;
|
|
}
|
|
|
|
static u64 sb1250_hpt_read(struct clocksource *cs)
|
|
{
|
|
return sb1250_hpt_get_cycles();
|
|
}
|
|
|
|
struct clocksource bcm1250_clocksource = {
|
|
.name = "bcm1250-counter-3",
|
|
.rating = 200,
|
|
.read = sb1250_hpt_read,
|
|
.mask = CLOCKSOURCE_MASK(23),
|
|
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
|
|
};
|
|
|
|
static u64 notrace sb1250_read_sched_clock(void)
|
|
{
|
|
return sb1250_hpt_get_cycles();
|
|
}
|
|
|
|
void __init sb1250_clocksource_init(void)
|
|
{
|
|
struct clocksource *cs = &bcm1250_clocksource;
|
|
|
|
/* Setup hpt using timer #3 but do not enable irq for it */
|
|
__raw_writeq(0,
|
|
IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM,
|
|
R_SCD_TIMER_CFG)));
|
|
__raw_writeq(SB1250_HPT_VALUE,
|
|
IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM,
|
|
R_SCD_TIMER_INIT)));
|
|
__raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS,
|
|
IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM,
|
|
R_SCD_TIMER_CFG)));
|
|
|
|
clocksource_register_hz(cs, V_SCD_TIMER_FREQ);
|
|
|
|
sched_clock_register(sb1250_read_sched_clock, 23, V_SCD_TIMER_FREQ);
|
|
}
|