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ARM: at91: define CLOCK_TICK_RATE to bogus value except A91X40 

We have a clocksource which renders CLOCK_TICK_RATE useless. Define
it to a bogus value to get rid of some ifdeffery.

use local LATCH for at91rm9200 timer

but keep it for A91X40 as we do not use a clocksource

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2011-10-16 18:17:09 +08:00
parent caca6a03d3
commit 2f5893cf42
2 changed files with 11 additions and 64 deletions
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8
arch/arm/mach-at91/at91rm9200_time.c
View File

@ -32,6 +32,8 @@ static unsigned long last_crtr;
static u32 irqmask;
static struct clock_event_device clkevt;
#define RM9200_TIMER_LATCH ((AT91_SLOW_CLOCK + HZ/2) / HZ)
/*
* The ST_CRTR is updated asynchronously to the master clock ... but
* the updates as seen by the CPU don't seem to be strictly monotonic.
@ -74,8 +76,8 @@ static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id)
if (sr & AT91_ST_PITS) {
u32 crtr = read_CRTR();
while (((crtr - last_crtr) & AT91_ST_CRTV) >= LATCH) {
last_crtr += LATCH;
while (((crtr - last_crtr) & AT91_ST_CRTV) >= RM9200_TIMER_LATCH) {
last_crtr += RM9200_TIMER_LATCH;
clkevt.event_handler(&clkevt);
}
return IRQ_HANDLED;
@ -116,7 +118,7 @@ clkevt32k_mode(enum clock_event_mode mode, struct clock_event_device *dev)
case CLOCK_EVT_MODE_PERIODIC:
/* PIT for periodic irqs; fixed rate of 1/HZ */
irqmask = AT91_ST_PITS;
at91_sys_write(AT91_ST_PIMR, LATCH);
at91_sys_write(AT91_ST_PIMR, RM9200_TIMER_LATCH);
break;
case CLOCK_EVT_MODE_ONESHOT:
/* ALM for oneshot irqs, set by next_event()

67
arch/arm/mach-at91/include/mach/timex.h
View File

@ -23,70 +23,15 @@
#include <mach/hardware.h>
#if defined(CONFIG_ARCH_AT91RM9200)
#define CLOCK_TICK_RATE (AT91_SLOW_CLOCK)
#elif defined(CONFIG_ARCH_AT91SAM9260)
#if defined(CONFIG_MACH_USB_A9260) || defined(CONFIG_MACH_QIL_A9260)
#define AT91SAM9_MASTER_CLOCK 90000000
#else
#define AT91SAM9_MASTER_CLOCK 99300000
#endif
#define CLOCK_TICK_RATE (AT91SAM9_MASTER_CLOCK/16)
#elif defined(CONFIG_ARCH_AT91SAM9261)
#define AT91SAM9_MASTER_CLOCK 99300000
#define CLOCK_TICK_RATE (AT91SAM9_MASTER_CLOCK/16)
#elif defined(CONFIG_ARCH_AT91SAM9G10)
#define AT91SAM9_MASTER_CLOCK 133000000
#define CLOCK_TICK_RATE (AT91SAM9_MASTER_CLOCK/16)
#elif defined(CONFIG_ARCH_AT91SAM9263)
#if defined(CONFIG_MACH_USB_A9263)
#define AT91SAM9_MASTER_CLOCK 90000000
#else
#define AT91SAM9_MASTER_CLOCK 99959500
#endif
#define CLOCK_TICK_RATE (AT91SAM9_MASTER_CLOCK/16)
#elif defined(CONFIG_ARCH_AT91SAM9RL)
#define AT91SAM9_MASTER_CLOCK 100000000
#define CLOCK_TICK_RATE (AT91SAM9_MASTER_CLOCK/16)
#elif defined(CONFIG_ARCH_AT91SAM9G20)
#if defined(CONFIG_MACH_USB_A9G20)
#define AT91SAM9_MASTER_CLOCK 133000000
#else
#define AT91SAM9_MASTER_CLOCK 132096000
#endif
#define CLOCK_TICK_RATE (AT91SAM9_MASTER_CLOCK/16)
#elif defined(CONFIG_ARCH_AT91SAM9G45)
#define AT91SAM9_MASTER_CLOCK 133333333
#define CLOCK_TICK_RATE (AT91SAM9_MASTER_CLOCK/16)
#elif defined(CONFIG_ARCH_AT91CAP9)
#define AT91CAP9_MASTER_CLOCK 100000000
#define CLOCK_TICK_RATE (AT91CAP9_MASTER_CLOCK/16)
#elif defined(CONFIG_ARCH_AT91X40)
#ifdef CONFIG_ARCH_AT91X40
#define AT91X40_MASTER_CLOCK 40000000
#define CLOCK_TICK_RATE (AT91X40_MASTER_CLOCK)
#endif
#else
#define CLOCK_TICK_RATE 12345678
#endif
#endif /* __ASM_ARCH_TIMEX_H */