Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org) |
| 4 | * Copytight (C) 1999, 2000 Silicon Graphics, Inc. |
| 5 | */ |
| 6 | #include <linux/bcd.h> |
| 7 | #include <linux/clockchips.h> |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/sched_clock.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | #include <linux/kernel_stat.h> |
| 14 | #include <linux/param.h> |
| 15 | #include <linux/smp.h> |
| 16 | #include <linux/time.h> |
| 17 | #include <linux/timex.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | |
| 21 | #include <asm/time.h> |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 22 | #include <asm/sgialib.h> |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 23 | #include <asm/sn/klconfig.h> |
| 24 | #include <asm/sn/arch.h> |
| 25 | #include <asm/sn/addrs.h> |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 26 | #include <asm/sn/agent.h> |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 27 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 28 | #include "ip27-common.h" |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 29 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 30 | static int rt_next_event(unsigned long delta, struct clock_event_device *evt) |
| 31 | { |
| 32 | unsigned int cpu = smp_processor_id(); |
| 33 | int slice = cputoslice(cpu); |
| 34 | unsigned long cnt; |
| 35 | |
| 36 | cnt = LOCAL_HUB_L(PI_RT_COUNT); |
| 37 | cnt += delta; |
| 38 | LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt); |
| 39 | |
| 40 | return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0; |
| 41 | } |
| 42 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 43 | static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent); |
| 44 | static DEFINE_PER_CPU(char [11], hub_rt_name); |
| 45 | |
| 46 | static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id) |
| 47 | { |
| 48 | unsigned int cpu = smp_processor_id(); |
| 49 | struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
| 50 | int slice = cputoslice(cpu); |
| 51 | |
| 52 | /* |
| 53 | * Ack |
| 54 | */ |
| 55 | LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0); |
| 56 | cd->event_handler(cd); |
| 57 | |
| 58 | return IRQ_HANDLED; |
| 59 | } |
| 60 | |
| 61 | struct irqaction hub_rt_irqaction = { |
| 62 | .handler = hub_rt_counter_handler, |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 63 | .percpu_dev_id = &hub_rt_clockevent, |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 64 | .flags = IRQF_PERCPU | IRQF_TIMER, |
| 65 | .name = "hub-rt", |
| 66 | }; |
| 67 | |
| 68 | /* |
| 69 | * This is a hack; we really need to figure these values out dynamically |
| 70 | * |
| 71 | * Since 800 ns works very well with various HUB frequencies, such as |
| 72 | * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time. |
| 73 | * |
| 74 | * Ralf: which clock rate is used to feed the counter? |
| 75 | */ |
| 76 | #define NSEC_PER_CYCLE 800 |
| 77 | #define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE) |
| 78 | |
| 79 | void hub_rt_clock_event_init(void) |
| 80 | { |
| 81 | unsigned int cpu = smp_processor_id(); |
| 82 | struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
| 83 | unsigned char *name = per_cpu(hub_rt_name, cpu); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 84 | |
| 85 | sprintf(name, "hub-rt %d", cpu); |
| 86 | cd->name = name; |
| 87 | cd->features = CLOCK_EVT_FEAT_ONESHOT; |
| 88 | clockevent_set_clock(cd, CYCLES_PER_SEC); |
| 89 | cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd); |
| 90 | cd->max_delta_ticks = 0xfffffffffffff; |
| 91 | cd->min_delta_ns = clockevent_delta2ns(0x300, cd); |
| 92 | cd->min_delta_ticks = 0x300; |
| 93 | cd->rating = 200; |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 94 | cd->irq = IP27_RT_TIMER_IRQ; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 95 | cd->cpumask = cpumask_of(cpu); |
| 96 | cd->set_next_event = rt_next_event; |
| 97 | clockevents_register_device(cd); |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 98 | |
| 99 | enable_percpu_irq(IP27_RT_TIMER_IRQ, IRQ_TYPE_NONE); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | static void __init hub_rt_clock_event_global_init(void) |
| 103 | { |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 104 | irq_set_handler(IP27_RT_TIMER_IRQ, handle_percpu_devid_irq); |
| 105 | irq_set_percpu_devid(IP27_RT_TIMER_IRQ); |
| 106 | setup_percpu_irq(IP27_RT_TIMER_IRQ, &hub_rt_irqaction); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | static u64 hub_rt_read(struct clocksource *cs) |
| 110 | { |
| 111 | return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); |
| 112 | } |
| 113 | |
| 114 | struct clocksource hub_rt_clocksource = { |
| 115 | .name = "HUB-RT", |
| 116 | .rating = 200, |
| 117 | .read = hub_rt_read, |
| 118 | .mask = CLOCKSOURCE_MASK(52), |
| 119 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| 120 | }; |
| 121 | |
| 122 | static u64 notrace hub_rt_read_sched_clock(void) |
| 123 | { |
| 124 | return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); |
| 125 | } |
| 126 | |
| 127 | static void __init hub_rt_clocksource_init(void) |
| 128 | { |
| 129 | struct clocksource *cs = &hub_rt_clocksource; |
| 130 | |
| 131 | clocksource_register_hz(cs, CYCLES_PER_SEC); |
| 132 | |
| 133 | sched_clock_register(hub_rt_read_sched_clock, 52, CYCLES_PER_SEC); |
| 134 | } |
| 135 | |
| 136 | void __init plat_time_init(void) |
| 137 | { |
| 138 | hub_rt_clocksource_init(); |
| 139 | hub_rt_clock_event_global_init(); |
| 140 | hub_rt_clock_event_init(); |
| 141 | } |
| 142 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 143 | void hub_rtc_init(nasid_t nasid) |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 144 | { |
| 145 | |
| 146 | /* |
| 147 | * We only need to initialize the current node. |
| 148 | * If this is not the current node then it is a cpuless |
| 149 | * node and timeouts will not happen there. |
| 150 | */ |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 151 | if (get_nasid() == nasid) { |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 152 | LOCAL_HUB_S(PI_RT_EN_A, 1); |
| 153 | LOCAL_HUB_S(PI_RT_EN_B, 1); |
| 154 | LOCAL_HUB_S(PI_PROF_EN_A, 0); |
| 155 | LOCAL_HUB_S(PI_PROF_EN_B, 0); |
| 156 | LOCAL_HUB_S(PI_RT_COUNT, 0); |
| 157 | LOCAL_HUB_S(PI_RT_PEND_A, 0); |
| 158 | LOCAL_HUB_S(PI_RT_PEND_B, 0); |
| 159 | } |
| 160 | } |