a904f74785
From Dave Johnson <djohnson+linuxmips@sw.starentnetworks.com>:
sb1250_gettimeoffset() simply reads the current cpu 0 timer remaining
value, however once this counter reaches 0 and the interrupt is raised,
it immediately resets and begins to count down again.
If sb1250_gettimeoffset() is called on cpu 1 via do_gettimeofday() after
the timer has reset but prior to cpu 0 processing the interrupt and
taking write_seqlock() in timer_interrupt() it will return a full value
(or close to it) causing time to jump backwards 1ms. Once cpu 0 handles
the interrupt and timer_interrupt() gets far enough along it will jump
forward 1ms.
Fix this problem by implementing mips_hpt_*() on sb1250 using a spare
timer unrelated to the existing periodic interrupt timers. It runs at
1Mhz with a full 23bit counter. This eliminated the custom
do_gettimeoffset() for sb1250 and allowed use of the generic
fixed_rate_gettimeoffset() using mips_hpt_*() and timerhi/timerlo.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*
|
|
* Copyright (C) 2000, 2001, 2002, 2003 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.
|
|
*/
|
|
|
|
#ifndef _ASM_SIBYTE_SB1250_H
|
|
#define _ASM_SIBYTE_SB1250_H
|
|
|
|
/*
|
|
* yymmddpp: year, month, day, patch.
|
|
* should sync with Makefile EXTRAVERSION
|
|
*/
|
|
#define SIBYTE_RELEASE 0x02111403
|
|
|
|
#define SB1250_NR_IRQS 64
|
|
|
|
#define BCM1480_NR_IRQS 128
|
|
#define BCM1480_NR_IRQS_HALF 64
|
|
|
|
#define SB1250_DUART_MINOR_BASE 64
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <asm/addrspace.h>
|
|
|
|
/* For revision/pass information */
|
|
#include <asm/sibyte/sb1250_scd.h>
|
|
#include <asm/sibyte/bcm1480_scd.h>
|
|
extern unsigned int sb1_pass;
|
|
extern unsigned int soc_pass;
|
|
extern unsigned int soc_type;
|
|
extern unsigned int periph_rev;
|
|
extern unsigned int zbbus_mhz;
|
|
|
|
extern void sb1250_hpt_setup(void);
|
|
extern void sb1250_time_init(void);
|
|
extern void sb1250_mask_irq(int cpu, int irq);
|
|
extern void sb1250_unmask_irq(int cpu, int irq);
|
|
extern void sb1250_smp_finish(void);
|
|
|
|
extern void bcm1480_time_init(void);
|
|
extern unsigned long bcm1480_gettimeoffset(void);
|
|
extern void bcm1480_mask_irq(int cpu, int irq);
|
|
extern void bcm1480_unmask_irq(int cpu, int irq);
|
|
extern void bcm1480_smp_finish(void);
|
|
|
|
extern void prom_printf(char *fmt, ...);
|
|
|
|
#define AT_spin \
|
|
__asm__ __volatile__ ( \
|
|
".set noat\n" \
|
|
"li $at, 0\n" \
|
|
"1: beqz $at, 1b\n" \
|
|
".set at\n" \
|
|
)
|
|
|
|
#endif
|
|
|
|
#define IOADDR(a) ((volatile void __iomem *)(IO_BASE + (a)))
|
|
|
|
#endif
|