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[ARM] 3822/1: iop3xx: rewrite time handling 

Merge and rewrite the iop32x/iop33x time code to do lost jiffy
tracking properly, and put the result in plat-iop/time.c.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Lennert Buytenhek 2006-09-18 23:18:16 +01:00 committed by Russell King
parent 7e9740b115
commit 48388b2a56
5 changed files with 127 additions and 1 deletions
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2
arch/arm/plat-iop/Makefile
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@ -2,7 +2,7 @@
# Makefile for the linux kernel.
#
obj-y := i2c.o pci.o setup.o
obj-y := i2c.o pci.o setup.o time.o
obj-m :=
obj-n :=
obj- :=

94
arch/arm/plat-iop/time.c Normal file
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@ -0,0 +1,94 @@
/*
* arch/arm/plat-iop/time.c
*
* Timer code for IOP32x and IOP33x based systems
*
* Author: Deepak Saxena <dsaxena@mvista.com>
*
* Copyright 2002-2003 MontaVista Software Inc.
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/init.h>
#include <linux/timex.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#ifdef CONFIG_ARCH_IOP32X
#define IRQ_IOP3XX_TIMER0 IRQ_IOP321_TIMER0
#else
#ifdef CONFIG_ARCH_IOP33X
#define IRQ_IOP3XX_TIMER0 IRQ_IOP331_TIMER0
#endif
#endif
static unsigned long ticks_per_jiffy;
static unsigned long ticks_per_usec;
static unsigned long next_jiffy_time;
unsigned long iop3xx_gettimeoffset(void)
{
unsigned long offset;
offset = next_jiffy_time - *IOP3XX_TU_TCR1;
return offset / ticks_per_usec;
}
static irqreturn_t
iop3xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
write_seqlock(&xtime_lock);
asm volatile("mcr p6, 0, %0, c6, c1, 0" : : "r" (1));
while ((signed long)(next_jiffy_time - *IOP3XX_TU_TCR1)
>= ticks_per_jiffy) {
timer_tick(regs);
next_jiffy_time -= ticks_per_jiffy;
}
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}
static struct irqaction iop3xx_timer_irq = {
.name = "IOP3XX Timer Tick",
.handler = iop3xx_timer_interrupt,
.flags = IRQF_DISABLED | IRQF_TIMER,
};
void __init iop3xx_init_time(unsigned long tick_rate)
{
u32 timer_ctl;
ticks_per_jiffy = (tick_rate + HZ/2) / HZ;
ticks_per_usec = tick_rate / 1000000;
next_jiffy_time = 0xffffffff;
timer_ctl = IOP3XX_TMR_EN | IOP3XX_TMR_PRIVILEGED |
IOP3XX_TMR_RELOAD | IOP3XX_TMR_RATIO_1_1;
/*
* We use timer 0 for our timer interrupt, and timer 1 as
* monotonic counter for tracking missed jiffies.
*/
asm volatile("mcr p6, 0, %0, c4, c1, 0" : : "r" (ticks_per_jiffy - 1));
asm volatile("mcr p6, 0, %0, c0, c1, 0" : : "r" (timer_ctl));
asm volatile("mcr p6, 0, %0, c5, c1, 0" : : "r" (0xffffffff));
asm volatile("mcr p6, 0, %0, c1, c1, 0" : : "r" (timer_ctl));
setup_irq(IRQ_IOP3XX_TIMER0, &iop3xx_timer_irq);
}

6
include/asm-arm/arch-iop32x/iop321.h
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@ -233,6 +233,12 @@
/* for I2C bit defs see drivers/i2c/i2c-iop3xx.h */
/*
* Peripherals that are shared between the iop32x and iop33x but
* located at different addresses.
*/
#define IOP3XX_TIMER_REG(reg) (IOP3XX_PERIPHERAL_VIRT_BASE + 0x07e0 + (reg))
#include <asm/hardware/iop3xx.h>

6
include/asm-arm/arch-iop33x/iop331.h
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@ -238,6 +238,12 @@
/* Reserved 0x0000178c through 0x000019ff */
/*
* Peripherals that are shared between the iop32x and iop33x but
* located at different addresses.
*/
#define IOP3XX_TIMER_REG(reg) (IOP3XX_PERIPHERAL_VIRT_BASE + 0x07d0 + (reg))
#include <asm/hardware/iop3xx.h>

20
include/asm-arm/hardware/iop3xx.h
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@ -81,6 +81,24 @@
#define IOP3XX_PCIXSR (volatile u32 *)IOP3XX_REG_ADDR(0x01e4)
#define IOP3XX_PCIIRSR (volatile u32 *)IOP3XX_REG_ADDR(0x01ec)
/* Timers */
#define IOP3XX_TU_TMR0 (volatile u32 *)IOP3XX_TIMER_REG(0x0000)
#define IOP3XX_TU_TMR1 (volatile u32 *)IOP3XX_TIMER_REG(0x0004)
#define IOP3XX_TU_TCR0 (volatile u32 *)IOP3XX_TIMER_REG(0x0008)
#define IOP3XX_TU_TCR1 (volatile u32 *)IOP3XX_TIMER_REG(0x000c)
#define IOP3XX_TU_TRR0 (volatile u32 *)IOP3XX_TIMER_REG(0x0010)
#define IOP3XX_TU_TRR1 (volatile u32 *)IOP3XX_TIMER_REG(0x0014)
#define IOP3XX_TU_TISR (volatile u32 *)IOP3XX_TIMER_REG(0x0018)
#define IOP3XX_TU_WDTCR (volatile u32 *)IOP3XX_TIMER_REG(0x001c)
#define IOP3XX_TMR_TC 0x01
#define IOP3XX_TMR_EN 0x02
#define IOP3XX_TMR_RELOAD 0x04
#define IOP3XX_TMR_PRIVILEGED 0x09
#define IOP3XX_TMR_RATIO_1_1 0x00
#define IOP3XX_TMR_RATIO_4_1 0x10
#define IOP3XX_TMR_RATIO_8_1 0x20
#define IOP3XX_TMR_RATIO_16_1 0x30
/* I2C bus interface unit */
#define IOP3XX_ICR0 (volatile u32 *)IOP3XX_REG_ADDR(0x1680)
#define IOP3XX_ISR0 (volatile u32 *)IOP3XX_REG_ADDR(0x1684)
@ -109,6 +127,8 @@
#ifndef __ASSEMBLY__
void iop3xx_map_io(void);
void iop3xx_init_time(unsigned long);
unsigned long iop3xx_gettimeoffset(void);
extern struct platform_device iop3xx_i2c0_device;
extern struct platform_device iop3xx_i2c1_device;