* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
+#include <linux/bug.h>
#include <linux/clockchips.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <irq.h>
-/*
- * The integer part of the number of usecs per jiffy is taken from tick,
- * but the fractional part is not recorded, so we calculate it using the
- * initial value of HZ. This aids systems where tick isn't really an
- * integer (e.g. for HZ = 128).
- */
-#define USECS_PER_JIFFY TICK_SIZE
-#define USECS_PER_JIFFY_FRAC ((unsigned long)(u32)((1000000ULL << 32) / HZ))
-
-#define TICK_SIZE (tick_nsec / 1000)
-
/*
* forward reference
*/
return rtc_mips_set_mmss(now.tv_sec);
}
-/* how many counter cycles in a jiffy */
-static unsigned long cycles_per_jiffy __read_mostly;
-
-/*
- * Null timer ack for systems not needing one (e.g. i8254).
- */
-static void null_timer_ack(void) { /* nothing */ }
-
/*
* Null high precision timer functions for systems lacking one.
*/
return 0;
}
-/*
- * Timer ack for an R4k-compatible timer of a known frequency.
- */
-static void c0_timer_ack(void)
-{
- write_c0_compare(read_c0_compare());
-}
-
/*
* High precision timer functions for a R4k-compatible timer.
*/
}
int (*mips_timer_state)(void);
-void (*mips_timer_ack)(void);
-
-/*
- * local_timer_interrupt() does profiling and process accounting
- * on a per-CPU basis.
- *
- * In UP mode, it is invoked from the (global) timer_interrupt.
- *
- * In SMP mode, it might invoked by per-CPU timer interrupt, or
- * a broadcasted inter-processor interrupt which itself is triggered
- * by the global timer interrupt.
- */
-void local_timer_interrupt(int irq, void *dev_id)
-{
- profile_tick(CPU_PROFILING);
- update_process_times(user_mode(get_irq_regs()));
-}
int null_perf_irq(void)
{
EXPORT_SYMBOL(perf_irq);
-/*
- * Timer interrupt
- */
-int cp0_compare_irq;
-
-/*
- * Performance counter IRQ or -1 if shared with timer
- */
-int cp0_perfcount_irq;
-EXPORT_SYMBOL_GPL(cp0_perfcount_irq);
-
-/*
- * Possibly handle a performance counter interrupt.
- * Return true if the timer interrupt should not be checked
- */
-static inline int handle_perf_irq(int r2)
-{
- /*
- * The performance counter overflow interrupt may be shared with the
- * timer interrupt (cp0_perfcount_irq < 0). If it is and a
- * performance counter has overflowed (perf_irq() == IRQ_HANDLED)
- * and we can't reliably determine if a counter interrupt has also
- * happened (!r2) then don't check for a timer interrupt.
- */
- return (cp0_perfcount_irq < 0) &&
- perf_irq() == IRQ_HANDLED &&
- !r2;
-}
-
/*
* time_init() - it does the following things.
*
* (only needed if you intended to use cpu counter as timer interrupt
* source)
* 2) calculate a couple of cached variables for later usage
- * 3) plat_timer_setup() -
- * a) (optional) over-write any choices made above by time_init().
- * b) machine specific code should setup the timer irqaction.
- * c) enable the timer interrupt
*/
unsigned int mips_hpt_frequency;
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
-static int mips_next_event(unsigned long delta,
- struct clock_event_device *evt)
-{
- unsigned int cnt;
- int res;
-
-#ifdef CONFIG_MIPS_MT_SMTC
- {
- unsigned long flags, vpflags;
- local_irq_save(flags);
- vpflags = dvpe();
-#endif
- cnt = read_c0_count();
- cnt += delta;
- write_c0_compare(cnt);
- res = ((long)(read_c0_count() - cnt ) > 0) ? -ETIME : 0;
-#ifdef CONFIG_MIPS_MT_SMTC
- evpe(vpflags);
- local_irq_restore(flags);
- }
-#endif
- return res;
-}
-
-static void mips_set_mode(enum clock_event_mode mode,
- struct clock_event_device *evt)
-{
- /* Nothing to do ... */
-}
-
-static DEFINE_PER_CPU(struct clock_event_device, mips_clockevent_device);
-static int cp0_timer_irq_installed;
-
-static irqreturn_t timer_interrupt(int irq, void *dev_id)
-{
- const int r2 = cpu_has_mips_r2;
- struct clock_event_device *cd;
- int cpu = smp_processor_id();
-
- /*
- * Suckage alert:
- * Before R2 of the architecture there was no way to see if a
- * performance counter interrupt was pending, so we have to run
- * the performance counter interrupt handler anyway.
- */
- if (handle_perf_irq(r2))
- goto out;
-
- /*
- * The same applies to performance counter interrupts. But with the
- * above we now know that the reason we got here must be a timer
- * interrupt. Being the paranoiacs we are we check anyway.
- */
- if (!r2 || (read_c0_cause() & (1 << 30))) {
- c0_timer_ack();
-#ifdef CONFIG_MIPS_MT_SMTC
- if (cpu_data[cpu].vpe_id)
- goto out;
- cpu = 0;
-#endif
- cd = &per_cpu(mips_clockevent_device, cpu);
- cd->event_handler(cd);
- }
-
-out:
- return IRQ_HANDLED;
-}
-
-static struct irqaction timer_irqaction = {
- .handler = timer_interrupt,
-#ifdef CONFIG_MIPS_MT_SMTC
- .flags = IRQF_DISABLED,
-#else
- .flags = IRQF_DISABLED | IRQF_PERCPU,
-#endif
- .name = "timer",
-};
-
-static void __init init_mips_clocksource(void)
+void __init clocksource_set_clock(struct clocksource *cs, unsigned int clock)
{
u64 temp;
u32 shift;
- if (!mips_hpt_frequency || clocksource_mips.read == null_hpt_read)
- return;
-
- /* Calclate a somewhat reasonable rating value */
- clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000;
/* Find a shift value */
for (shift = 32; shift > 0; shift--) {
temp = (u64) NSEC_PER_SEC << shift;
- do_div(temp, mips_hpt_frequency);
+ do_div(temp, clock);
if ((temp >> 32) == 0)
break;
}
- clocksource_mips.shift = shift;
- clocksource_mips.mult = (u32)temp;
-
- clocksource_register(&clocksource_mips);
+ cs->shift = shift;
+ cs->mult = (u32) temp;
}
-void __init __weak plat_time_init(void)
+void __cpuinit clockevent_set_clock(struct clock_event_device *cd,
+ unsigned int clock)
{
-}
-
-void __init __weak plat_timer_setup(struct irqaction *irq)
-{
-}
-
-#ifdef CONFIG_MIPS_MT_SMTC
-DEFINE_PER_CPU(struct clock_event_device, smtc_dummy_clockevent_device);
-
-static void smtc_set_mode(enum clock_event_mode mode,
- struct clock_event_device *evt)
-{
-}
-
-int dummycnt[NR_CPUS];
-
-static void mips_broadcast(cpumask_t mask)
-{
- unsigned int cpu;
+ u64 temp;
+ u32 shift;
- for_each_cpu_mask(cpu, mask)
- smtc_send_ipi(cpu, SMTC_CLOCK_TICK, 0);
+ /* Find a shift value */
+ for (shift = 32; shift > 0; shift--) {
+ temp = (u64) clock << shift;
+ do_div(temp, NSEC_PER_SEC);
+ if ((temp >> 32) == 0)
+ break;
+ }
+ cd->shift = shift;
+ cd->mult = (u32) temp;
}
-static void setup_smtc_dummy_clockevent_device(void)
+static void __init init_mips_clocksource(void)
{
- //uint64_t mips_freq = mips_hpt_^frequency;
- unsigned int cpu = smp_processor_id();
- struct clock_event_device *cd;
-
- cd = &per_cpu(smtc_dummy_clockevent_device, cpu);
-
- cd->name = "SMTC";
- cd->features = CLOCK_EVT_FEAT_DUMMY;
-
- /* Calculate the min / max delta */
- cd->mult = 0; //div_sc((unsigned long) mips_freq, NSEC_PER_SEC, 32);
- cd->shift = 0; //32;
- cd->max_delta_ns = 0; //clockevent_delta2ns(0x7fffffff, cd);
- cd->min_delta_ns = 0; //clockevent_delta2ns(0x30, cd);
-
- cd->rating = 200;
- cd->irq = 17; //-1;
-// if (cpu)
-// cd->cpumask = CPU_MASK_ALL; // cpumask_of_cpu(cpu);
-// else
- cd->cpumask = cpumask_of_cpu(cpu);
+ if (!mips_hpt_frequency || clocksource_mips.read == null_hpt_read)
+ return;
- cd->set_mode = smtc_set_mode;
+ /* Calclate a somewhat reasonable rating value */
+ clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000;
- cd->broadcast = mips_broadcast;
+ clocksource_set_clock(&clocksource_mips, mips_hpt_frequency);
- clockevents_register_device(cd);
+ clocksource_register(&clocksource_mips);
}
-#endif
-static void mips_event_handler(struct clock_event_device *dev)
+void __init __weak plat_time_init(void)
{
}
-void __cpuinit mips_clockevent_init(void)
+/*
+ * This function exists in order to cause an error due to a duplicate
+ * definition if platform code should have its own implementation. The hook
+ * to use instead is plat_time_init. plat_time_init does not receive the
+ * irqaction pointer argument anymore. This is because any function which
+ * initializes an interrupt timer now takes care of its own request_irq rsp.
+ * setup_irq calls and each clock_event_device should use its own
+ * struct irqrequest.
+ */
+void __init plat_timer_setup(struct irqaction *irq)
{
- uint64_t mips_freq = mips_hpt_frequency;
- unsigned int cpu = smp_processor_id();
- struct clock_event_device *cd;
- unsigned int irq = MIPS_CPU_IRQ_BASE + 7;
-
- if (!cpu_has_counter)
- return;
-
-#ifdef CONFIG_MIPS_MT_SMTC
- setup_smtc_dummy_clockevent_device();
-
- /*
- * On SMTC we only register VPE0's compare interrupt as clockevent
- * device.
- */
- if (cpu)
- return;
-#endif
-
- cd = &per_cpu(mips_clockevent_device, cpu);
-
- cd->name = "MIPS";
- cd->features = CLOCK_EVT_FEAT_ONESHOT;
-
- /* Calculate the min / max delta */
- cd->mult = div_sc((unsigned long) mips_freq, NSEC_PER_SEC, 32);
- cd->shift = 32;
- cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
- cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
-
- cd->rating = 300;
- cd->irq = irq;
-#ifdef CONFIG_MIPS_MT_SMTC
- cd->cpumask = CPU_MASK_ALL;
-#else
- cd->cpumask = cpumask_of_cpu(cpu);
-#endif
- cd->set_next_event = mips_next_event;
- cd->set_mode = mips_set_mode;
- cd->event_handler = mips_event_handler;
-
- clockevents_register_device(cd);
-
- if (!cp0_timer_irq_installed) {
-#ifdef CONFIG_MIPS_MT_SMTC
-#define CPUCTR_IMASKBIT (0x100 << cp0_compare_irq)
- setup_irq_smtc(irq, &timer_irqaction, CPUCTR_IMASKBIT);
-#else
- setup_irq(irq, &timer_irqaction);
-#endif /* CONFIG_MIPS_MT_SMTC */
- cp0_timer_irq_installed = 1;
- }
+ BUG();
}
void __init time_init(void)
if (!clocksource_mips.read) {
/* No external high precision timer -- use R4k. */
clocksource_mips.read = c0_hpt_read;
-
- if (!mips_timer_state) {
- /* No external timer interrupt -- use R4k. */
- mips_timer_ack = c0_timer_ack;
- /* Calculate cache parameters. */
- cycles_per_jiffy =
- (mips_hpt_frequency + HZ / 2) / HZ;
- }
}
if (!mips_hpt_frequency)
mips_hpt_frequency = calibrate_hpt();
printk("Using %u.%03u MHz high precision timer.\n",
((mips_hpt_frequency + 500) / 1000) / 1000,
((mips_hpt_frequency + 500) / 1000) % 1000);
-
-#ifdef CONFIG_IRQ_CPU
- setup_irq(MIPS_CPU_IRQ_BASE + 7, &timer_irqaction);
-#endif
}
- if (!mips_timer_ack)
- /* No timer interrupt ack (e.g. i8254). */
- mips_timer_ack = null_timer_ack;
-
- /*
- * Call board specific timer interrupt setup.
- *
- * this pointer must be setup in machine setup routine.
- *
- * Even if a machine chooses to use a low-level timer interrupt,
- * it still needs to setup the timer_irqaction.
- * In that case, it might be better to set timer_irqaction.handler
- * to be NULL function so that we are sure the high-level code
- * is not invoked accidentally.
- */
- plat_timer_setup(&timer_irqaction);
-
init_mips_clocksource();
mips_clockevent_init();
}
Code Review / linux-3.10.git / blobdiff