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drivers/clocksource/timer-mp-csky.c
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// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/init.h> #include <linux/interrupt.h> #include <linux/sched_clock.h> #include <linux/cpu.h> #include <linux/of_irq.h> #include <asm/reg_ops.h> #include "timer-of.h" #define PTIM_CCVR "cr<3, 14>" #define PTIM_CTLR "cr<0, 14>" #define PTIM_LVR "cr<6, 14>" #define PTIM_TSR "cr<1, 14>" static int csky_mptimer_irq; static int csky_mptimer_set_next_event(unsigned long delta, struct clock_event_device *ce) { mtcr(PTIM_LVR, delta); return 0; } static int csky_mptimer_shutdown(struct clock_event_device *ce) { mtcr(PTIM_CTLR, 0); return 0; } static int csky_mptimer_oneshot(struct clock_event_device *ce) { mtcr(PTIM_CTLR, 1); return 0; } static int csky_mptimer_oneshot_stopped(struct clock_event_device *ce) { mtcr(PTIM_CTLR, 0); return 0; } static DEFINE_PER_CPU(struct timer_of, csky_to) = { .flags = TIMER_OF_CLOCK, .clkevt = { .rating = 300, .features = CLOCK_EVT_FEAT_PERCPU | CLOCK_EVT_FEAT_ONESHOT, .set_state_shutdown = csky_mptimer_shutdown, .set_state_oneshot = csky_mptimer_oneshot, .set_state_oneshot_stopped = csky_mptimer_oneshot_stopped, .set_next_event = csky_mptimer_set_next_event, }, }; static irqreturn_t csky_timer_interrupt(int irq, void *dev) { struct timer_of *to = this_cpu_ptr(&csky_to); mtcr(PTIM_TSR, 0); to->clkevt.event_handler(&to->clkevt); return IRQ_HANDLED; } /* * clock event for percpu */ static int csky_mptimer_starting_cpu(unsigned int cpu) { struct timer_of *to = per_cpu_ptr(&csky_to, cpu); to->clkevt.cpumask = cpumask_of(cpu); |
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enable_percpu_irq(csky_mptimer_irq, 0); |
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clockevents_config_and_register(&to->clkevt, timer_of_rate(to), 2, ULONG_MAX); |
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return 0; } static int csky_mptimer_dying_cpu(unsigned int cpu) { disable_percpu_irq(csky_mptimer_irq); return 0; } /* * clock source */ |
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static u64 notrace sched_clock_read(void) |
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{ return (u64)mfcr(PTIM_CCVR); } static u64 clksrc_read(struct clocksource *c) { return (u64)mfcr(PTIM_CCVR); } struct clocksource csky_clocksource = { .name = "csky", .rating = 400, .mask = CLOCKSOURCE_MASK(32), .flags = CLOCK_SOURCE_IS_CONTINUOUS, .read = clksrc_read, }; static int __init csky_mptimer_init(struct device_node *np) { int ret, cpu, cpu_rollback; struct timer_of *to = NULL; /* * Csky_mptimer is designed for C-SKY SMP multi-processors and * every core has it's own private irq and regs for clkevt and * clksrc. * * The regs is accessed by cpu instruction: mfcr/mtcr instead of * mmio map style. So we needn't mmio-address in dts, but we still * need to give clk and irq number. * * We use private irq for the mptimer and irq number is the same * for every core. So we use request_percpu_irq() in timer_of_init. */ csky_mptimer_irq = irq_of_parse_and_map(np, 0); if (csky_mptimer_irq <= 0) return -EINVAL; ret = request_percpu_irq(csky_mptimer_irq, csky_timer_interrupt, "csky_mp_timer", &csky_to); if (ret) return -EINVAL; for_each_possible_cpu(cpu) { to = per_cpu_ptr(&csky_to, cpu); ret = timer_of_init(np, to); if (ret) goto rollback; } clocksource_register_hz(&csky_clocksource, timer_of_rate(to)); sched_clock_register(sched_clock_read, 32, timer_of_rate(to)); ret = cpuhp_setup_state(CPUHP_AP_CSKY_TIMER_STARTING, "clockevents/csky/timer:starting", csky_mptimer_starting_cpu, csky_mptimer_dying_cpu); if (ret) return -EINVAL; return 0; rollback: for_each_possible_cpu(cpu_rollback) { if (cpu_rollback == cpu) break; to = per_cpu_ptr(&csky_to, cpu_rollback); timer_of_cleanup(to); } return -EINVAL; } TIMER_OF_DECLARE(csky_mptimer, "csky,mptimer", csky_mptimer_init); |