| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org) |
| * Copytight (C) 1999, 2000 Silicon Graphics, Inc. |
| */ |
| #include <linux/bcd.h> |
| #include <linux/clockchips.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/sched_clock.h> |
| #include <linux/interrupt.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/param.h> |
| #include <linux/smp.h> |
| #include <linux/time.h> |
| #include <linux/timex.h> |
| #include <linux/mm.h> |
| #include <linux/platform_device.h> |
| |
| #include <asm/time.h> |
| #include <asm/pgtable.h> |
| #include <asm/sgialib.h> |
| #include <asm/sn/ioc3.h> |
| #include <asm/sn/klconfig.h> |
| #include <asm/sn/arch.h> |
| #include <asm/sn/addrs.h> |
| #include <asm/sn/sn_private.h> |
| #include <asm/sn/sn0/ip27.h> |
| #include <asm/sn/sn0/hub.h> |
| |
| #define TICK_SIZE (tick_nsec / 1000) |
| |
| /* Includes for ioc3_init(). */ |
| #include <asm/sn/types.h> |
| #include <asm/sn/sn0/addrs.h> |
| #include <asm/sn/sn0/hubni.h> |
| #include <asm/sn/sn0/hubio.h> |
| #include <asm/pci/bridge.h> |
| |
| static void enable_rt_irq(struct irq_data *d) |
| { |
| } |
| |
| static void disable_rt_irq(struct irq_data *d) |
| { |
| } |
| |
| static struct irq_chip rt_irq_type = { |
| .name = "SN HUB RT timer", |
| .irq_mask = disable_rt_irq, |
| .irq_unmask = enable_rt_irq, |
| }; |
| |
| static int rt_next_event(unsigned long delta, struct clock_event_device *evt) |
| { |
| unsigned int cpu = smp_processor_id(); |
| int slice = cputoslice(cpu); |
| unsigned long cnt; |
| |
| cnt = LOCAL_HUB_L(PI_RT_COUNT); |
| cnt += delta; |
| LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt); |
| |
| return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0; |
| } |
| |
| unsigned int rt_timer_irq; |
| |
| static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent); |
| static DEFINE_PER_CPU(char [11], hub_rt_name); |
| |
| static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id) |
| { |
| unsigned int cpu = smp_processor_id(); |
| struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
| int slice = cputoslice(cpu); |
| |
| /* |
| * Ack |
| */ |
| LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0); |
| cd->event_handler(cd); |
| |
| return IRQ_HANDLED; |
| } |
| |
| struct irqaction hub_rt_irqaction = { |
| .handler = hub_rt_counter_handler, |
| .flags = IRQF_PERCPU | IRQF_TIMER, |
| .name = "hub-rt", |
| }; |
| |
| /* |
| * This is a hack; we really need to figure these values out dynamically |
| * |
| * Since 800 ns works very well with various HUB frequencies, such as |
| * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time. |
| * |
| * Ralf: which clock rate is used to feed the counter? |
| */ |
| #define NSEC_PER_CYCLE 800 |
| #define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE) |
| |
| void hub_rt_clock_event_init(void) |
| { |
| unsigned int cpu = smp_processor_id(); |
| struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
| unsigned char *name = per_cpu(hub_rt_name, cpu); |
| int irq = rt_timer_irq; |
| |
| sprintf(name, "hub-rt %d", cpu); |
| cd->name = name; |
| cd->features = CLOCK_EVT_FEAT_ONESHOT; |
| clockevent_set_clock(cd, CYCLES_PER_SEC); |
| cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd); |
| cd->max_delta_ticks = 0xfffffffffffff; |
| cd->min_delta_ns = clockevent_delta2ns(0x300, cd); |
| cd->min_delta_ticks = 0x300; |
| cd->rating = 200; |
| cd->irq = irq; |
| cd->cpumask = cpumask_of(cpu); |
| cd->set_next_event = rt_next_event; |
| clockevents_register_device(cd); |
| } |
| |
| static void __init hub_rt_clock_event_global_init(void) |
| { |
| int irq; |
| |
| do { |
| smp_wmb(); |
| irq = rt_timer_irq; |
| if (irq) |
| break; |
| |
| irq = allocate_irqno(); |
| if (irq < 0) |
| panic("Allocation of irq number for timer failed"); |
| } while (xchg(&rt_timer_irq, irq)); |
| |
| irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq); |
| setup_irq(irq, &hub_rt_irqaction); |
| } |
| |
| static u64 hub_rt_read(struct clocksource *cs) |
| { |
| return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); |
| } |
| |
| struct clocksource hub_rt_clocksource = { |
| .name = "HUB-RT", |
| .rating = 200, |
| .read = hub_rt_read, |
| .mask = CLOCKSOURCE_MASK(52), |
| .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| }; |
| |
| static u64 notrace hub_rt_read_sched_clock(void) |
| { |
| return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); |
| } |
| |
| static void __init hub_rt_clocksource_init(void) |
| { |
| struct clocksource *cs = &hub_rt_clocksource; |
| |
| clocksource_register_hz(cs, CYCLES_PER_SEC); |
| |
| sched_clock_register(hub_rt_read_sched_clock, 52, CYCLES_PER_SEC); |
| } |
| |
| void __init plat_time_init(void) |
| { |
| hub_rt_clocksource_init(); |
| hub_rt_clock_event_global_init(); |
| hub_rt_clock_event_init(); |
| } |
| |
| void cpu_time_init(void) |
| { |
| lboard_t *board; |
| klcpu_t *cpu; |
| int cpuid; |
| |
| /* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */ |
| board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27); |
| if (!board) |
| panic("Can't find board info for myself."); |
| |
| cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX; |
| cpu = (klcpu_t *) KLCF_COMP(board, cpuid); |
| if (!cpu) |
| panic("No information about myself?"); |
| |
| printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed); |
| |
| set_c0_status(SRB_TIMOCLK); |
| } |
| |
| void hub_rtc_init(cnodeid_t cnode) |
| { |
| |
| /* |
| * We only need to initialize the current node. |
| * If this is not the current node then it is a cpuless |
| * node and timeouts will not happen there. |
| */ |
| if (get_compact_nodeid() == cnode) { |
| LOCAL_HUB_S(PI_RT_EN_A, 1); |
| LOCAL_HUB_S(PI_RT_EN_B, 1); |
| LOCAL_HUB_S(PI_PROF_EN_A, 0); |
| LOCAL_HUB_S(PI_PROF_EN_B, 0); |
| LOCAL_HUB_S(PI_RT_COUNT, 0); |
| LOCAL_HUB_S(PI_RT_PEND_A, 0); |
| LOCAL_HUB_S(PI_RT_PEND_B, 0); |
| } |
| } |
| |
| static int __init sgi_ip27_rtc_devinit(void) |
| { |
| struct resource res; |
| |
| memset(&res, 0, sizeof(res)); |
| res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base + |
| IOC3_BYTEBUS_DEV0); |
| res.end = res.start + 32767; |
| res.flags = IORESOURCE_MEM; |
| |
| return IS_ERR(platform_device_register_simple("rtc-m48t35", -1, |
| &res, 1)); |
| } |
| |
| /* |
| * kludge make this a device_initcall after ioc3 resource conflicts |
| * are resolved |
| */ |
| late_initcall(sgi_ip27_rtc_devinit); |