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ARCv2: clocksource: Introduce 64bit local RTC counter
Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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b3210d141f
commit
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3 changed files with 62 additions and 2 deletions
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@ -372,6 +372,11 @@ config ARC_HAS_LL64
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dest operands with 2 possible source operands.
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dest operands with 2 possible source operands.
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default y
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default y
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config ARC_HAS_RTC
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bool "Local 64-bit r/o cycle counter"
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default n
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depends on !SMP
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config ARC_NUMBER_OF_INTERRUPTS
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config ARC_NUMBER_OF_INTERRUPTS
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int "Number of interrupts"
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int "Number of interrupts"
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range 8 240
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range 8 240
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@ -200,9 +200,11 @@ static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
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(unsigned int)(arc_get_core_freq() / 1000000),
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(unsigned int)(arc_get_core_freq() / 1000000),
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(unsigned int)(arc_get_core_freq() / 10000) % 100);
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(unsigned int)(arc_get_core_freq() / 10000) % 100);
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n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s\nISA Extn\t: ",
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n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
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IS_AVAIL1(cpu->timers.t0, "Timer0 "),
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IS_AVAIL1(cpu->timers.t0, "Timer0 "),
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IS_AVAIL1(cpu->timers.t1, "Timer1 "));
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IS_AVAIL1(cpu->timers.t1, "Timer1 "),
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IS_AVAIL2(cpu->timers.rtc, "64-bit RTC ",
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CONFIG_ARC_HAS_RTC));
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n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
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n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
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IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
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IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
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@ -290,6 +292,9 @@ static void arc_chk_core_config(void)
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if (!cpu->timers.t1)
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if (!cpu->timers.t1)
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panic("Timer1 is not present!\n");
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panic("Timer1 is not present!\n");
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if (IS_ENABLED(CONFIG_ARC_HAS_RTC) && !cpu->timers.rtc)
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panic("RTC is not present\n");
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#ifdef CONFIG_ARC_HAS_DCCM
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#ifdef CONFIG_ARC_HAS_DCCM
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/*
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/*
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* DCCM can be arbit placed in hardware.
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* DCCM can be arbit placed in hardware.
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@ -60,6 +60,54 @@
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/********** Clock Source Device *********/
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/********** Clock Source Device *********/
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#ifdef CONFIG_ARC_HAS_RTC
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#define AUX_RTC_CTRL 0x103
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#define AUX_RTC_LOW 0x104
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#define AUX_RTC_HIGH 0x105
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int arc_counter_setup(void)
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{
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write_aux_reg(AUX_RTC_CTRL, 1);
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/* Not usable in SMP */
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return !IS_ENABLED(CONFIG_SMP);
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}
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static cycle_t arc_counter_read(struct clocksource *cs)
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{
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unsigned long status;
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union {
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#ifdef CONFIG_CPU_BIG_ENDIAN
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struct { u32 high, low; };
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#else
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struct { u32 low, high; };
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#endif
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cycle_t full;
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} stamp;
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__asm__ __volatile(
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"1: \n"
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" lr %0, [AUX_RTC_LOW] \n"
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" lr %1, [AUX_RTC_HIGH] \n"
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" lr %2, [AUX_RTC_CTRL] \n"
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" bbit0.nt %2, 31, 1b \n"
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: "=r" (stamp.low), "=r" (stamp.high), "=r" (status));
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return stamp.full;
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}
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static struct clocksource arc_counter = {
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.name = "ARCv2 RTC",
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.rating = 350,
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.read = arc_counter_read,
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.mask = CLOCKSOURCE_MASK(64),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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#else /* !CONFIG_ARC_HAS_RTC */
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/*
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/*
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* set 32bit TIMER1 to keep counting monotonically and wraparound
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* set 32bit TIMER1 to keep counting monotonically and wraparound
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*/
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*/
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@ -86,6 +134,8 @@ static struct clocksource arc_counter = {
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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};
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#endif
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/********** Clock Event Device *********/
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/********** Clock Event Device *********/
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/*
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/*
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