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Linux/arch/mips/kernel/csrc-bcm1480.c

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  1 /*
  2  * Copyright (C) 2000,2001,2004 Broadcom Corporation
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public License
  6  * as published by the Free Software Foundation; either version 2
  7  * of the License, or (at your option) any later version.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  */
 14 #include <linux/clocksource.h>
 15 #include <linux/sched_clock.h>
 16 
 17 #include <asm/addrspace.h>
 18 #include <asm/io.h>
 19 #include <asm/time.h>
 20 
 21 #include <asm/sibyte/bcm1480_regs.h>
 22 #include <asm/sibyte/sb1250_regs.h>
 23 #include <asm/sibyte/bcm1480_int.h>
 24 #include <asm/sibyte/bcm1480_scd.h>
 25 
 26 #include <asm/sibyte/sb1250.h>
 27 
 28 static u64 bcm1480_hpt_read(struct clocksource *cs)
 29 {
 30         return (u64) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
 31 }
 32 
 33 struct clocksource bcm1480_clocksource = {
 34         .name   = "zbbus-cycles",
 35         .rating = 200,
 36         .read   = bcm1480_hpt_read,
 37         .mask   = CLOCKSOURCE_MASK(64),
 38         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 39 };
 40 
 41 static u64 notrace sb1480_read_sched_clock(void)
 42 {
 43         return __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
 44 }
 45 
 46 void __init sb1480_clocksource_init(void)
 47 {
 48         struct clocksource *cs = &bcm1480_clocksource;
 49         unsigned int plldiv;
 50         unsigned long zbbus;
 51 
 52         plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
 53         zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000);
 54         clocksource_register_hz(cs, zbbus);
 55 
 56         sched_clock_register(sb1480_read_sched_clock, 64, zbbus);
 57 }
 58 

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