diff options
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/cevt-r4k.c | 272 | ||||
| -rw-r--r-- | arch/mips/kernel/time.c | 241 | ||||
| -rw-r--r-- | arch/mips/kernel/traps.c | 11 |
4 files changed, 285 insertions, 241 deletions
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index 95a356ef391..a3afa39faae 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -8,6 +8,8 @@ obj-y += cpu-probe.o branch.o entry.o genex.o irq.o process.o \ ptrace.o reset.o semaphore.o setup.o signal.o syscall.o \ time.o topology.o traps.o unaligned.o +obj-$(CONFIG_CEVT_R4K) += cevt-r4k.o + binfmt_irix-objs := irixelf.o irixinv.o irixioctl.o irixsig.o \ irix5sys.o sysirix.o diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c new file mode 100644 index 00000000000..08b84d476c8 --- /dev/null +++ b/arch/mips/kernel/cevt-r4k.c @@ -0,0 +1,272 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2007 MIPS Technologies, Inc. + * Copyright (C) 2007 Ralf Baechle <ralf@linux-mips.org> + */ +#include <linux/clockchips.h> +#include <linux/interrupt.h> +#include <linux/percpu.h> + +#include <asm/time.h> + +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; + +/* + * Timer ack for an R4k-compatible timer of a known frequency. + */ +static void c0_timer_ack(void) +{ + write_c0_compare(read_c0_compare()); +} + +/* + * 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; +} + +static irqreturn_t c0_compare_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 c0_compare_irqaction = { + .handler = c0_compare_interrupt, +#ifdef CONFIG_MIPS_MT_SMTC + .flags = IRQF_DISABLED, +#else + .flags = IRQF_DISABLED | IRQF_PERCPU, +#endif + .name = "timer", +}; + +#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) +{ +} + +static void mips_broadcast(cpumask_t mask) +{ + unsigned int cpu; + + for_each_cpu_mask(cpu, mask) + smtc_send_ipi(cpu, SMTC_CLOCK_TICK, 0); +} + +static void setup_smtc_dummy_clockevent_device(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); + + cd->set_mode = smtc_set_mode; + + cd->broadcast = mips_broadcast; + + clockevents_register_device(cd); +} +#endif + +static void mips_event_handler(struct clock_event_device *dev) +{ +} + +/* + * FIXME: This doesn't hold for the relocated E9000 compare interrupt. + */ +static int c0_compare_int_pending(void) +{ + return (read_c0_cause() >> cp0_compare_irq) & 0x100; +} + +static int c0_compare_int_usable(void) +{ + const unsigned int delta = 0x300000; + unsigned int cnt; + + /* + * IP7 already pending? Try to clear it by acking the timer. + */ + if (c0_compare_int_pending()) { + write_c0_compare(read_c0_compare()); + irq_disable_hazard(); + if (c0_compare_int_pending()) + return 0; + } + + cnt = read_c0_count(); + cnt += delta; + write_c0_compare(cnt); + + while ((long)(read_c0_count() - cnt) <= 0) + ; /* Wait for expiry */ + + if (!c0_compare_int_pending()) + return 0; + + write_c0_compare(read_c0_compare()); + irq_disable_hazard(); + if (c0_compare_int_pending()) + return 0; + + /* + * Feels like a real count / compare timer. + */ + return 1; +} + +void __cpuinit mips_clockevent_init(void) +{ + 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 + + if (!c0_compare_int_usable()) + return; + + 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, &c0_compare_irqaction, CPUCTR_IMASKBIT); +#else + setup_irq(irq, &c0_compare_irqaction); +#endif /* CONFIG_MIPS_MT_SMTC */ + cp0_timer_irq_installed = 1; + } +} diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c index abadb8cb77c..ea7cfe766a8 100644 --- a/arch/mips/kernel/time.c +++ b/arch/mips/kernel/time.c @@ -81,14 +81,6 @@ static cycle_t null_hpt_read(void) } /* - * 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. */ static cycle_t c0_hpt_read(void) @@ -126,35 +118,6 @@ int (*perf_irq)(void) = null_perf_irq; 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. * * 1) plat_time_init() - @@ -219,84 +182,6 @@ struct clocksource clocksource_mips = { .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) { u64 temp; @@ -336,8 +221,6 @@ static void smtc_set_mode(enum clock_event_mode mode, { } -int dummycnt[NR_CPUS]; - static void mips_broadcast(cpumask_t mask) { unsigned int cpu; @@ -378,113 +261,6 @@ static void setup_smtc_dummy_clockevent_device(void) } #endif -static void mips_event_handler(struct clock_event_device *dev) -{ -} - -/* - * FIXME: This doesn't hold for the relocated E9000 compare interrupt. - */ -static int c0_compare_int_pending(void) -{ - return (read_c0_cause() >> cp0_compare_irq) & 0x100; -} - -static int c0_compare_int_usable(void) -{ - const unsigned int delta = 0x300000; - unsigned int cnt; - - /* - * IP7 already pending? Try to clear it by acking the timer. - */ - if (c0_compare_int_pending()) { - write_c0_compare(read_c0_compare()); - irq_disable_hazard(); - if (c0_compare_int_pending()) - return 0; - } - - cnt = read_c0_count(); - cnt += delta; - write_c0_compare(cnt); - - while ((long)(read_c0_count() - cnt) <= 0) - ; /* Wait for expiry */ - - if (!c0_compare_int_pending()) - return 0; - - write_c0_compare(read_c0_compare()); - irq_disable_hazard(); - if (c0_compare_int_pending()) - return 0; - - /* - * Feels like a real count / compare timer. - */ - return 1; -} - -void __cpuinit mips_clockevent_init(void) -{ - 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 - - if (!c0_compare_int_usable()) - return; - - 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; - } -} - void __init time_init(void) { plat_time_init(); @@ -511,25 +287,8 @@ void __init time_init(void) 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 } - /* - * 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(); } diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index bbf01b81a4f..7b78d137259 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -1336,6 +1336,17 @@ extern void cpu_cache_init(void); extern void tlb_init(void); extern void flush_tlb_handlers(void); +/* + * 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); + void __init per_cpu_trap_init(void) { unsigned int cpu = smp_processor_id(); |