Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
ee5e12e7 LB |
3 | * Copyright (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org) |
4 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
1da177e4 LT |
5 | */ |
6 | #include <linux/bcd.h> | |
e887b245 | 7 | #include <linux/clockchips.h> |
1da177e4 LT |
8 | #include <linux/init.h> |
9 | #include <linux/kernel.h> | |
10 | #include <linux/sched.h> | |
c41cef36 | 11 | #include <linux/sched_clock.h> |
1da177e4 LT |
12 | #include <linux/interrupt.h> |
13 | #include <linux/kernel_stat.h> | |
14 | #include <linux/param.h> | |
631330f5 | 15 | #include <linux/smp.h> |
1da177e4 LT |
16 | #include <linux/time.h> |
17 | #include <linux/timex.h> | |
18 | #include <linux/mm.h> | |
3ec066cd | 19 | #include <linux/platform_device.h> |
1da177e4 LT |
20 | |
21 | #include <asm/time.h> | |
1da177e4 | 22 | #include <asm/sgialib.h> |
1da177e4 LT |
23 | #include <asm/sn/klconfig.h> |
24 | #include <asm/sn/arch.h> | |
25 | #include <asm/sn/addrs.h> | |
b78e9d63 | 26 | #include <asm/sn/agent.h> |
9d0aaf98 TB |
27 | |
28 | #include "ip27-common.h" | |
1da177e4 | 29 | |
06d428d7 | 30 | static int rt_next_event(unsigned long delta, struct clock_event_device *evt) |
e887b245 RB |
31 | { |
32 | unsigned int cpu = smp_processor_id(); | |
c8925297 | 33 | int slice = cputoslice(cpu); |
e887b245 RB |
34 | unsigned long cnt; |
35 | ||
36 | cnt = LOCAL_HUB_L(PI_RT_COUNT); | |
37 | cnt += delta; | |
725d7b36 | 38 | LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt); |
e887b245 RB |
39 | |
40 | return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0; | |
41 | } | |
42 | ||
b32bb803 TB |
43 | static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent); |
44 | static DEFINE_PER_CPU(char [11], hub_rt_name); | |
45 | ||
06d428d7 | 46 | static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id) |
e887b245 | 47 | { |
e887b245 | 48 | unsigned int cpu = smp_processor_id(); |
b32bb803 | 49 | struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
725d7b36 | 50 | int slice = cputoslice(cpu); |
e887b245 | 51 | |
725d7b36 RB |
52 | /* |
53 | * Ack | |
54 | */ | |
c8925297 | 55 | LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0); |
e887b245 RB |
56 | cd->event_handler(cd); |
57 | ||
58 | return IRQ_HANDLED; | |
59 | } | |
60 | ||
06d428d7 RB |
61 | struct irqaction hub_rt_irqaction = { |
62 | .handler = hub_rt_counter_handler, | |
69a07a41 | 63 | .percpu_dev_id = &hub_rt_clockevent, |
8b5690f8 | 64 | .flags = IRQF_PERCPU | IRQF_TIMER, |
06d428d7 | 65 | .name = "hub-rt", |
3c009442 RB |
66 | }; |
67 | ||
e887b245 RB |
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 | ||
078a55fc | 79 | void hub_rt_clock_event_init(void) |
1da177e4 | 80 | { |
e887b245 | 81 | unsigned int cpu = smp_processor_id(); |
06d428d7 RB |
82 | struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
83 | unsigned char *name = per_cpu(hub_rt_name, cpu); | |
06d428d7 RB |
84 | |
85 | sprintf(name, "hub-rt %d", cpu); | |
b32bb803 TB |
86 | cd->name = name; |
87 | cd->features = CLOCK_EVT_FEAT_ONESHOT; | |
06d428d7 | 88 | clockevent_set_clock(cd, CYCLES_PER_SEC); |
70342287 | 89 | cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd); |
e4db9253 | 90 | cd->max_delta_ticks = 0xfffffffffffff; |
70342287 | 91 | cd->min_delta_ns = clockevent_delta2ns(0x300, cd); |
e4db9253 | 92 | cd->min_delta_ticks = 0x300; |
b32bb803 | 93 | cd->rating = 200; |
69a07a41 | 94 | cd->irq = IP27_RT_TIMER_IRQ; |
320ab2b0 | 95 | cd->cpumask = cpumask_of(cpu); |
b32bb803 | 96 | cd->set_next_event = rt_next_event; |
e887b245 | 97 | clockevents_register_device(cd); |
69a07a41 TB |
98 | |
99 | enable_percpu_irq(IP27_RT_TIMER_IRQ, IRQ_TYPE_NONE); | |
06d428d7 RB |
100 | } |
101 | ||
102 | static void __init hub_rt_clock_event_global_init(void) | |
103 | { | |
69a07a41 TB |
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); | |
1da177e4 LT |
107 | } |
108 | ||
a5a1d1c2 | 109 | static u64 hub_rt_read(struct clocksource *cs) |
16b7b2ac AN |
110 | { |
111 | return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); | |
112 | } | |
113 | ||
06d428d7 | 114 | struct clocksource hub_rt_clocksource = { |
e887b245 | 115 | .name = "HUB-RT", |
70342287 | 116 | .rating = 200, |
87b2335d RB |
117 | .read = hub_rt_read, |
118 | .mask = CLOCKSOURCE_MASK(52), | |
87b2335d RB |
119 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
120 | }; | |
121 | ||
c41cef36 DCZ |
122 | static u64 notrace hub_rt_read_sched_clock(void) |
123 | { | |
124 | return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); | |
125 | } | |
126 | ||
06d428d7 | 127 | static void __init hub_rt_clocksource_init(void) |
1da177e4 | 128 | { |
06d428d7 RB |
129 | struct clocksource *cs = &hub_rt_clocksource; |
130 | ||
75c4fd8c | 131 | clocksource_register_hz(cs, CYCLES_PER_SEC); |
c41cef36 DCZ |
132 | |
133 | sched_clock_register(hub_rt_read_sched_clock, 52, CYCLES_PER_SEC); | |
1da177e4 LT |
134 | } |
135 | ||
e887b245 RB |
136 | void __init plat_time_init(void) |
137 | { | |
06d428d7 RB |
138 | hub_rt_clocksource_init(); |
139 | hub_rt_clock_event_global_init(); | |
b32bb803 | 140 | hub_rt_clock_event_init(); |
e887b245 RB |
141 | } |
142 | ||
4bf841eb | 143 | void hub_rtc_init(nasid_t nasid) |
1da177e4 | 144 | { |
3ec066cd | 145 | |
1da177e4 LT |
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 | */ | |
4bf841eb | 151 | if (get_nasid() == nasid) { |
1da177e4 LT |
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); | |
1da177e4 LT |
156 | LOCAL_HUB_S(PI_RT_COUNT, 0); |
157 | LOCAL_HUB_S(PI_RT_PEND_A, 0); | |
1da177e4 LT |
158 | LOCAL_HUB_S(PI_RT_PEND_B, 0); |
159 | } | |
160 | } |