This source file includes following definitions.
- rt_next_event
- hub_rt_counter_handler
- hub_rt_clock_event_init
- hub_rt_clock_event_global_init
- hub_rt_read
- hub_rt_read_sched_clock
- hub_rt_clocksource_init
- plat_time_init
- cpu_time_init
- hub_rtc_init
- sgi_ip27_rtc_devinit
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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
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
41 static 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
54 static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
55 static DEFINE_PER_CPU(char [11], hub_rt_name);
56
57 static 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
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
72 struct 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 };
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79
80
81
82
83
84
85
86
87 #define NSEC_PER_CYCLE 800
88 #define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
89
90 void 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
113 static 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
120 static u64 hub_rt_read(struct clocksource *cs)
121 {
122 return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
123 }
124
125 struct 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
133 static u64 notrace hub_rt_read_sched_clock(void)
134 {
135 return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
136 }
137
138 static 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
147 void __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
154 void cpu_time_init(void)
155 {
156 lboard_t *board;
157 klcpu_t *cpu;
158 int cpuid;
159
160
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
173 void hub_rtc_init(cnodeid_t cnode)
174 {
175
176
177
178
179
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
192 static 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
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209
210 late_initcall(sgi_ip27_rtc_devinit);