From: Thomas Langer thomas.langer@lantiq.com
The common code just needs the C0_COUNT as free running counter, without the need of writing and checking C0_COMPARE.
The function get_tbclk() is still implemented here instead of changing all places of CONFIG_SYS_MIPS_TIMER_FREQ to CONFIG_SYS_TIMER_RATE.
The change was tested on a MIPS32 system, but as the MIPS64 code was/is the same, this should be no problem.
Signed-off-by: Thomas Langer thomas.langer@lantiq.com --- arch/mips/cpu/mips32/time.c | 59 +++---------------------------------------- arch/mips/cpu/mips64/time.c | 59 +++---------------------------------------- 2 files changed, 8 insertions(+), 110 deletions(-)
diff --git a/arch/mips/cpu/mips32/time.c b/arch/mips/cpu/mips32/time.c index 386f45a..553da5f 100644 --- a/arch/mips/cpu/mips32/time.c +++ b/arch/mips/cpu/mips32/time.c @@ -8,63 +8,12 @@ #include <common.h> #include <asm/mipsregs.h>
-static unsigned long timestamp; - -/* how many counter cycles in a jiffy */ -#define CYCLES_PER_JIFFY \ - (CONFIG_SYS_MIPS_TIMER_FREQ + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ - -/* - * timer without interrupts - */ - -int timer_init(void) -{ - /* Set up the timer for the first expiration. */ - write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY); - - return 0; -} - -ulong get_timer(ulong base) -{ - unsigned int count; - unsigned int expirelo = read_c0_compare(); - - /* Check to see if we have missed any timestamps. */ - count = read_c0_count(); - while ((count - expirelo) < 0x7fffffff) { - expirelo += CYCLES_PER_JIFFY; - timestamp++; - } - write_c0_compare(expirelo); - - return timestamp - base; -} - -void __udelay(unsigned long usec) +unsigned long notrace timer_read_counter(void) { - unsigned int tmo; - - tmo = read_c0_count() + (usec * (CONFIG_SYS_MIPS_TIMER_FREQ / 1000000)); - while ((tmo - read_c0_count()) < 0x7fffffff) - /*NOP*/; + return read_c0_count(); }
-/* - * This function is derived from PowerPC code (read timebase as long long). - * On MIPS it just returns the timer value. - */ -unsigned long long get_ticks(void) -{ - return get_timer(0); -} - -/* - * This function is derived from PowerPC code (timebase clock frequency). - * On MIPS it returns the number of timer ticks per second. - */ -ulong get_tbclk(void) +ulong notrace get_tbclk(void) { - return CONFIG_SYS_HZ; + return CONFIG_SYS_MIPS_TIMER_FREQ; } diff --git a/arch/mips/cpu/mips64/time.c b/arch/mips/cpu/mips64/time.c index 0497acf..553da5f 100644 --- a/arch/mips/cpu/mips64/time.c +++ b/arch/mips/cpu/mips64/time.c @@ -8,63 +8,12 @@ #include <common.h> #include <asm/mipsregs.h>
-static unsigned long timestamp; - -/* how many counter cycles in a jiffy */ -#define CYCLES_PER_JIFFY \ - (CONFIG_SYS_MIPS_TIMER_FREQ + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ - -/* - * timer without interrupts - */ - -int timer_init(void) -{ - /* Set up the timer for the first expiration. */ - write_c0_compare(read_c0_count() + CYCLES_PER_JIFFY); - - return 0; -} - -ulong get_timer(ulong base) -{ - unsigned int count; - unsigned int expirelo = read_c0_compare(); - - /* Check to see if we have missed any timestamps. */ - count = read_c0_count(); - while ((count - expirelo) < 0x7fffffff) { - expirelo += CYCLES_PER_JIFFY; - timestamp++; - } - write_c0_compare(expirelo); - - return timestamp - base; -} - -void __udelay(unsigned long usec) +unsigned long notrace timer_read_counter(void) { - unsigned int tmo; - - tmo = read_c0_count() + (usec * (CONFIG_SYS_MIPS_TIMER_FREQ / 1000000)); - while ((tmo - read_c0_count()) < 0x7fffffff) - /*NOP*/; + return read_c0_count(); }
-/* - * This function is derived from PowerPC code (read timebase as long long). - * On MIPS it just returns the timer value. - */ -unsigned long long get_ticks(void) -{ - return get_timer(0); -} - -/* - * This function is derived from PowerPC code (timebase clock frequency). - * On MIPS it returns the number of timer ticks per second. - */ -ulong get_tbclk(void) +ulong notrace get_tbclk(void) { - return CONFIG_SYS_HZ; + return CONFIG_SYS_MIPS_TIMER_FREQ; }