mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 09:02:00 +00:00
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2000,2001,2004 Broadcom Corporation
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
#include <linux/clocksource.h>
|
|
|
|
#include <asm/addrspace.h>
|
|
#include <asm/io.h>
|
|
#include <asm/time.h>
|
|
|
|
#include <asm/sibyte/bcm1480_regs.h>
|
|
#include <asm/sibyte/sb1250_regs.h>
|
|
#include <asm/sibyte/bcm1480_int.h>
|
|
#include <asm/sibyte/bcm1480_scd.h>
|
|
|
|
#include <asm/sibyte/sb1250.h>
|
|
|
|
static cycle_t bcm1480_hpt_read(void)
|
|
{
|
|
return (cycle_t) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
|
|
}
|
|
|
|
struct clocksource bcm1480_clocksource = {
|
|
.name = "zbbus-cycles",
|
|
.rating = 200,
|
|
.read = bcm1480_hpt_read,
|
|
.mask = CLOCKSOURCE_MASK(64),
|
|
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
|
|
};
|
|
|
|
void __init sb1480_clocksource_init(void)
|
|
{
|
|
struct clocksource *cs = &bcm1480_clocksource;
|
|
unsigned int plldiv;
|
|
unsigned long zbbus;
|
|
|
|
plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
|
|
zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000);
|
|
clocksource_set_clock(cs, zbbus);
|
|
clocksource_register(cs);
|
|
}
|