linux/arch/mips/kernel/csrc-bcm1480.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (C) 2000,2001,2004 Broadcom Corporation
   4 */
   5#include <linux/clocksource.h>
   6#include <linux/sched_clock.h>
   7
   8#include <asm/addrspace.h>
   9#include <asm/io.h>
  10#include <asm/time.h>
  11
  12#include <asm/sibyte/bcm1480_regs.h>
  13#include <asm/sibyte/sb1250_regs.h>
  14#include <asm/sibyte/bcm1480_int.h>
  15#include <asm/sibyte/bcm1480_scd.h>
  16
  17#include <asm/sibyte/sb1250.h>
  18
  19static u64 bcm1480_hpt_read(struct clocksource *cs)
  20{
  21        return (u64) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
  22}
  23
  24struct clocksource bcm1480_clocksource = {
  25        .name   = "zbbus-cycles",
  26        .rating = 200,
  27        .read   = bcm1480_hpt_read,
  28        .mask   = CLOCKSOURCE_MASK(64),
  29        .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
  30};
  31
  32static u64 notrace sb1480_read_sched_clock(void)
  33{
  34        return __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
  35}
  36
  37void __init sb1480_clocksource_init(void)
  38{
  39        struct clocksource *cs = &bcm1480_clocksource;
  40        unsigned int plldiv;
  41        unsigned long zbbus;
  42
  43        plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
  44        zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000);
  45        clocksource_register_hz(cs, zbbus);
  46
  47        sched_clock_register(sb1480_read_sched_clock, 64, zbbus);
  48}
  49