diff options
Diffstat (limited to 'drivers/clocksource/numachip.c')
-rw-r--r-- | drivers/clocksource/numachip.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/clocksource/numachip.c b/drivers/clocksource/numachip.c new file mode 100644 index 0000000..4e0f11f --- /dev/null +++ b/drivers/clocksource/numachip.c @@ -0,0 +1,95 @@ +/* + * + * Copyright (C) 2015 Numascale AS. All rights reserved. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/clockchips.h> + +#include <asm/irq.h> +#include <asm/numachip/numachip.h> +#include <asm/numachip/numachip_csr.h> + +static DEFINE_PER_CPU(struct clock_event_device, numachip2_ced); + +static cycles_t numachip2_timer_read(struct clocksource *cs) +{ + return numachip2_read64_lcsr(NUMACHIP2_TIMER_NOW); +} + +static struct clocksource numachip2_clocksource = { + .name = "numachip2", + .rating = 295, + .read = numachip2_timer_read, + .mask = CLOCKSOURCE_MASK(64), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, + .mult = 1, + .shift = 0, +}; + +static int numachip2_set_next_event(unsigned long delta, struct clock_event_device *ced) +{ + numachip2_write64_lcsr(NUMACHIP2_TIMER_DEADLINE + numachip2_timer(), + delta); + return 0; +} + +static struct clock_event_device numachip2_clockevent = { + .name = "numachip2", + .rating = 400, + .set_next_event = numachip2_set_next_event, + .features = CLOCK_EVT_FEAT_ONESHOT, + .mult = 1, + .shift = 0, + .min_delta_ns = 1250, + .max_delta_ns = LONG_MAX, +}; + +static void numachip_timer_interrupt(void) +{ + struct clock_event_device *ced = this_cpu_ptr(&numachip2_ced); + + ced->event_handler(ced); +} + +static __init void numachip_timer_each(struct work_struct *work) +{ + unsigned local_apicid = __this_cpu_read(x86_cpu_to_apicid) & 0xff; + struct clock_event_device *ced = this_cpu_ptr(&numachip2_ced); + + /* Setup IPI vector to local core and relative timing mode */ + numachip2_write64_lcsr(NUMACHIP2_TIMER_INT + numachip2_timer(), + (3 << 22) | (X86_PLATFORM_IPI_VECTOR << 14) | + (local_apicid << 6)); + + *ced = numachip2_clockevent; + ced->cpumask = cpumask_of(smp_processor_id()); + clockevents_register_device(ced); +} + +static int __init numachip_timer_init(void) +{ + if (numachip_system != 2) + return -ENODEV; + + /* Reset timer */ + numachip2_write64_lcsr(NUMACHIP2_TIMER_RESET, 0); + clocksource_register_hz(&numachip2_clocksource, NSEC_PER_SEC); + + /* Setup per-cpu clockevents */ + x86_platform_ipi_callback = numachip_timer_interrupt; + schedule_on_each_cpu(&numachip_timer_each); + + return 0; +} + +arch_initcall(numachip_timer_init); |