1
2
3
4
5#include <linux/bcd.h>
6#include <linux/clockchips.h>
7#include <linux/init.h>
8#include <linux/kernel.h>
9#include <linux/sched.h>
10#include <linux/interrupt.h>
11#include <linux/kernel_stat.h>
12#include <linux/param.h>
13#include <linux/smp.h>
14#include <linux/time.h>
15#include <linux/timex.h>
16#include <linux/mm.h>
17#include <linux/platform_device.h>
18
19#include <asm/time.h>
20#include <asm/pgtable.h>
21#include <asm/sgialib.h>
22#include <asm/sn/ioc3.h>
23#include <asm/sn/klconfig.h>
24#include <asm/sn/arch.h>
25#include <asm/sn/addrs.h>
26#include <asm/sn/sn_private.h>
27#include <asm/sn/sn0/ip27.h>
28#include <asm/sn/sn0/hub.h>
29
30#define TICK_SIZE (tick_nsec / 1000)
31
32
33#include <asm/sn/types.h>
34#include <asm/sn/sn0/addrs.h>
35#include <asm/sn/sn0/hubni.h>
36#include <asm/sn/sn0/hubio.h>
37#include <asm/pci/bridge.h>
38
39static void enable_rt_irq(unsigned int irq)
40{
41}
42
43static void disable_rt_irq(unsigned int irq)
44{
45}
46
47static struct irq_chip rt_irq_type = {
48 .name = "SN HUB RT timer",
49 .ack = disable_rt_irq,
50 .mask = disable_rt_irq,
51 .mask_ack = disable_rt_irq,
52 .unmask = enable_rt_irq,
53 .eoi = enable_rt_irq,
54};
55
56static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
57{
58 unsigned int cpu = smp_processor_id();
59 int slice = cputoslice(cpu);
60 unsigned long cnt;
61
62 cnt = LOCAL_HUB_L(PI_RT_COUNT);
63 cnt += delta;
64 LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
65
66 return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
67}
68
69static void rt_set_mode(enum clock_event_mode mode,
70 struct clock_event_device *evt)
71{
72 switch (mode) {
73 case CLOCK_EVT_MODE_ONESHOT:
74
75 break;
76
77 case CLOCK_EVT_MODE_PERIODIC:
78 case CLOCK_EVT_MODE_UNUSED:
79 case CLOCK_EVT_MODE_SHUTDOWN:
80 case CLOCK_EVT_MODE_RESUME:
81
82 break;
83 }
84}
85
86int rt_timer_irq;
87
88static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
89static DEFINE_PER_CPU(char [11], hub_rt_name);
90
91static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
92{
93 unsigned int cpu = smp_processor_id();
94 struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
95 int slice = cputoslice(cpu);
96
97
98
99
100 LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
101 cd->event_handler(cd);
102
103 return IRQ_HANDLED;
104}
105
106struct irqaction hub_rt_irqaction = {
107 .handler = hub_rt_counter_handler,
108 .flags = IRQF_DISABLED | IRQF_PERCPU | IRQF_TIMER,
109 .name = "hub-rt",
110};
111
112
113
114
115
116
117
118
119
120#define NSEC_PER_CYCLE 800
121#define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
122
123void __cpuinit hub_rt_clock_event_init(void)
124{
125 unsigned int cpu = smp_processor_id();
126 struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
127 unsigned char *name = per_cpu(hub_rt_name, cpu);
128 int irq = rt_timer_irq;
129
130 sprintf(name, "hub-rt %d", cpu);
131 cd->name = name;
132 cd->features = CLOCK_EVT_FEAT_ONESHOT;
133 clockevent_set_clock(cd, CYCLES_PER_SEC);
134 cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd);
135 cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
136 cd->rating = 200;
137 cd->irq = irq;
138 cd->cpumask = cpumask_of(cpu);
139 cd->set_next_event = rt_next_event;
140 cd->set_mode = rt_set_mode;
141 clockevents_register_device(cd);
142}
143
144static void __init hub_rt_clock_event_global_init(void)
145{
146 int irq;
147
148 do {
149 smp_wmb();
150 irq = rt_timer_irq;
151 if (irq)
152 break;
153
154 irq = allocate_irqno();
155 if (irq < 0)
156 panic("Allocation of irq number for timer failed");
157 } while (xchg(&rt_timer_irq, irq));
158
159 set_irq_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
160 setup_irq(irq, &hub_rt_irqaction);
161}
162
163static cycle_t hub_rt_read(struct clocksource *cs)
164{
165 return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
166}
167
168struct clocksource hub_rt_clocksource = {
169 .name = "HUB-RT",
170 .rating = 200,
171 .read = hub_rt_read,
172 .mask = CLOCKSOURCE_MASK(52),
173 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
174};
175
176static void __init hub_rt_clocksource_init(void)
177{
178 struct clocksource *cs = &hub_rt_clocksource;
179
180 clocksource_set_clock(cs, CYCLES_PER_SEC);
181 clocksource_register(cs);
182}
183
184void __init plat_time_init(void)
185{
186 hub_rt_clocksource_init();
187 hub_rt_clock_event_global_init();
188 hub_rt_clock_event_init();
189}
190
191void __cpuinit cpu_time_init(void)
192{
193 lboard_t *board;
194 klcpu_t *cpu;
195 int cpuid;
196
197
198 board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
199 if (!board)
200 panic("Can't find board info for myself.");
201
202 cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
203 cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
204 if (!cpu)
205 panic("No information about myself?");
206
207 printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
208
209 set_c0_status(SRB_TIMOCLK);
210}
211
212void __cpuinit hub_rtc_init(cnodeid_t cnode)
213{
214
215
216
217
218
219
220 if (get_compact_nodeid() == cnode) {
221 LOCAL_HUB_S(PI_RT_EN_A, 1);
222 LOCAL_HUB_S(PI_RT_EN_B, 1);
223 LOCAL_HUB_S(PI_PROF_EN_A, 0);
224 LOCAL_HUB_S(PI_PROF_EN_B, 0);
225 LOCAL_HUB_S(PI_RT_COUNT, 0);
226 LOCAL_HUB_S(PI_RT_PEND_A, 0);
227 LOCAL_HUB_S(PI_RT_PEND_B, 0);
228 }
229}
230
231static int __init sgi_ip27_rtc_devinit(void)
232{
233 struct resource res;
234
235 memset(&res, 0, sizeof(res));
236 res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base +
237 IOC3_BYTEBUS_DEV0);
238 res.end = res.start + 32767;
239 res.flags = IORESOURCE_MEM;
240
241 return IS_ERR(platform_device_register_simple("rtc-m48t35", -1,
242 &res, 1));
243}
244
245
246
247
248
249late_initcall(sgi_ip27_rtc_devinit);
250
