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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
4 * Copyright (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>
22#include <asm/sgialib.h>
23#include <asm/sn/klconfig.h>
24#include <asm/sn/arch.h>
25#include <asm/sn/addrs.h>
26#include <asm/sn/agent.h>
27
28#include "ip27-common.h"
29
30static 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
43static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
44static DEFINE_PER_CPU(char [11], hub_rt_name);
45
46static 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
61struct irqaction hub_rt_irqaction = {
62 .handler = hub_rt_counter_handler,
63 .percpu_dev_id = &hub_rt_clockevent,
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
79void 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);
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;
94 cd->irq = IP27_RT_TIMER_IRQ;
95 cd->cpumask = cpumask_of(cpu);
96 cd->set_next_event = rt_next_event;
97 clockevents_register_device(cd);
98
99 enable_percpu_irq(IP27_RT_TIMER_IRQ, IRQ_TYPE_NONE);
100}
101
102static void __init hub_rt_clock_event_global_init(void)
103{
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);
107}
108
109static u64 hub_rt_read(struct clocksource *cs)
110{
111 return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
112}
113
114struct 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
122static u64 notrace hub_rt_read_sched_clock(void)
123{
124 return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
125}
126
127static 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
136void __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
143void hub_rtc_init(nasid_t nasid)
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 */
151 if (get_nasid() == nasid) {
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}
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>
22#include <asm/pgtable.h>
23#include <asm/sgialib.h>
24#include <asm/sn/ioc3.h>
25#include <asm/sn/klconfig.h>
26#include <asm/sn/arch.h>
27#include <asm/sn/addrs.h>
28#include <asm/sn/sn_private.h>
29#include <asm/sn/sn0/ip27.h>
30#include <asm/sn/sn0/hub.h>
31
32#define TICK_SIZE (tick_nsec / 1000)
33
34/* Includes for ioc3_init(). */
35#include <asm/sn/types.h>
36#include <asm/sn/sn0/addrs.h>
37#include <asm/sn/sn0/hubni.h>
38#include <asm/sn/sn0/hubio.h>
39#include <asm/pci/bridge.h>
40
41static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
42{
43 unsigned int cpu = smp_processor_id();
44 int slice = cputoslice(cpu);
45 unsigned long cnt;
46
47 cnt = LOCAL_HUB_L(PI_RT_COUNT);
48 cnt += delta;
49 LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
50
51 return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
52}
53
54static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
55static DEFINE_PER_CPU(char [11], hub_rt_name);
56
57static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
58{
59 unsigned int cpu = smp_processor_id();
60 struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
61 int slice = cputoslice(cpu);
62
63 /*
64 * Ack
65 */
66 LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
67 cd->event_handler(cd);
68
69 return IRQ_HANDLED;
70}
71
72struct irqaction hub_rt_irqaction = {
73 .handler = hub_rt_counter_handler,
74 .percpu_dev_id = &hub_rt_clockevent,
75 .flags = IRQF_PERCPU | IRQF_TIMER,
76 .name = "hub-rt",
77};
78
79/*
80 * This is a hack; we really need to figure these values out dynamically
81 *
82 * Since 800 ns works very well with various HUB frequencies, such as
83 * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
84 *
85 * Ralf: which clock rate is used to feed the counter?
86 */
87#define NSEC_PER_CYCLE 800
88#define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
89
90void hub_rt_clock_event_init(void)
91{
92 unsigned int cpu = smp_processor_id();
93 struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
94 unsigned char *name = per_cpu(hub_rt_name, cpu);
95
96 sprintf(name, "hub-rt %d", cpu);
97 cd->name = name;
98 cd->features = CLOCK_EVT_FEAT_ONESHOT;
99 clockevent_set_clock(cd, CYCLES_PER_SEC);
100 cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd);
101 cd->max_delta_ticks = 0xfffffffffffff;
102 cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
103 cd->min_delta_ticks = 0x300;
104 cd->rating = 200;
105 cd->irq = IP27_RT_TIMER_IRQ;
106 cd->cpumask = cpumask_of(cpu);
107 cd->set_next_event = rt_next_event;
108 clockevents_register_device(cd);
109
110 enable_percpu_irq(IP27_RT_TIMER_IRQ, IRQ_TYPE_NONE);
111}
112
113static void __init hub_rt_clock_event_global_init(void)
114{
115 irq_set_handler(IP27_RT_TIMER_IRQ, handle_percpu_devid_irq);
116 irq_set_percpu_devid(IP27_RT_TIMER_IRQ);
117 setup_percpu_irq(IP27_RT_TIMER_IRQ, &hub_rt_irqaction);
118}
119
120static u64 hub_rt_read(struct clocksource *cs)
121{
122 return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
123}
124
125struct clocksource hub_rt_clocksource = {
126 .name = "HUB-RT",
127 .rating = 200,
128 .read = hub_rt_read,
129 .mask = CLOCKSOURCE_MASK(52),
130 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
131};
132
133static u64 notrace hub_rt_read_sched_clock(void)
134{
135 return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
136}
137
138static void __init hub_rt_clocksource_init(void)
139{
140 struct clocksource *cs = &hub_rt_clocksource;
141
142 clocksource_register_hz(cs, CYCLES_PER_SEC);
143
144 sched_clock_register(hub_rt_read_sched_clock, 52, CYCLES_PER_SEC);
145}
146
147void __init plat_time_init(void)
148{
149 hub_rt_clocksource_init();
150 hub_rt_clock_event_global_init();
151 hub_rt_clock_event_init();
152}
153
154void cpu_time_init(void)
155{
156 lboard_t *board;
157 klcpu_t *cpu;
158 int cpuid;
159
160 /* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */
161 board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
162 if (!board)
163 panic("Can't find board info for myself.");
164
165 cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
166 cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
167 if (!cpu)
168 panic("No information about myself?");
169
170 printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
171}
172
173void hub_rtc_init(cnodeid_t cnode)
174{
175
176 /*
177 * We only need to initialize the current node.
178 * If this is not the current node then it is a cpuless
179 * node and timeouts will not happen there.
180 */
181 if (get_compact_nodeid() == cnode) {
182 LOCAL_HUB_S(PI_RT_EN_A, 1);
183 LOCAL_HUB_S(PI_RT_EN_B, 1);
184 LOCAL_HUB_S(PI_PROF_EN_A, 0);
185 LOCAL_HUB_S(PI_PROF_EN_B, 0);
186 LOCAL_HUB_S(PI_RT_COUNT, 0);
187 LOCAL_HUB_S(PI_RT_PEND_A, 0);
188 LOCAL_HUB_S(PI_RT_PEND_B, 0);
189 }
190}
191
192static int __init sgi_ip27_rtc_devinit(void)
193{
194 struct resource res;
195
196 memset(&res, 0, sizeof(res));
197 res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base +
198 IOC3_BYTEBUS_DEV0);
199 res.end = res.start + 32767;
200 res.flags = IORESOURCE_MEM;
201
202 return IS_ERR(platform_device_register_simple("rtc-m48t35", -1,
203 &res, 1));
204}
205
206/*
207 * kludge make this a device_initcall after ioc3 resource conflicts
208 * are resolved
209 */
210late_initcall(sgi_ip27_rtc_devinit);