2 * Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
3 * Copytight (C) 1999, 2000 Silicon Graphics, Inc.
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/time.h>
14 #include <linux/timex.h>
18 #include <asm/pgtable.h>
19 #include <asm/sgialib.h>
20 #include <asm/sn/ioc3.h>
21 #include <asm/m48t35.h>
22 #include <asm/sn/klconfig.h>
23 #include <asm/sn/arch.h>
24 #include <asm/sn/addrs.h>
25 #include <asm/sn/sn_private.h>
26 #include <asm/sn/sn0/ip27.h>
27 #include <asm/sn/sn0/hub.h>
29 #define TICK_SIZE (tick_nsec / 1000)
32 static int set_rtc_mmss(unsigned long nowtime)
35 int real_seconds, real_minutes, cmos_minutes;
36 struct m48t35_rtc *rtc;
40 rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base +
43 rtc->control |= M48T35_RTC_READ;
44 cmos_minutes = BCD2BIN(rtc->min);
45 rtc->control &= ~M48T35_RTC_READ;
48 * Since we're only adjusting minutes and seconds, don't interfere with
49 * hour overflow. This avoids messing with unknown time zones but
50 * requires your RTC not to be off by more than 15 minutes
52 real_seconds = nowtime % 60;
53 real_minutes = nowtime / 60;
54 if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
55 real_minutes += 30; /* correct for half hour time zone */
58 if (abs(real_minutes - cmos_minutes) < 30) {
59 real_seconds = BIN2BCD(real_seconds);
60 real_minutes = BIN2BCD(real_minutes);
61 rtc->control |= M48T35_RTC_SET;
62 rtc->sec = real_seconds;
63 rtc->min = real_minutes;
64 rtc->control &= ~M48T35_RTC_SET;
67 "set_rtc_mmss: can't update from %d to %d\n",
68 cmos_minutes, real_minutes);
76 /* Includes for ioc3_init(). */
77 #include <asm/sn/types.h>
78 #include <asm/sn/sn0/addrs.h>
79 #include <asm/sn/sn0/hubni.h>
80 #include <asm/sn/sn0/hubio.h>
81 #include <asm/pci/bridge.h>
83 unsigned long read_persistent_clock(void)
85 unsigned int year, month, date, hour, min, sec;
86 struct m48t35_rtc *rtc;
90 rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base +
93 rtc->control |= M48T35_RTC_READ;
100 rtc->control &= ~M48T35_RTC_READ;
104 hour = BCD2BIN(hour);
105 date = BCD2BIN(date);
106 month = BCD2BIN(month);
107 year = BCD2BIN(year);
111 return mktime(year, month, date, hour, min, sec);
114 static void enable_rt_irq(unsigned int irq)
118 static void disable_rt_irq(unsigned int irq)
122 static struct irq_chip rt_irq_type = {
123 .name = "SN HUB RT timer",
124 .ack = disable_rt_irq,
125 .mask = disable_rt_irq,
126 .mask_ack = disable_rt_irq,
127 .unmask = enable_rt_irq,
128 .eoi = enable_rt_irq,
131 static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
133 unsigned int cpu = smp_processor_id();
134 int slice = cputoslice(cpu) == 0;
137 cnt = LOCAL_HUB_L(PI_RT_COUNT);
139 LOCAL_HUB_S(slice ? PI_RT_COMPARE_A : PI_RT_COMPARE_B, cnt);
141 return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
144 static void rt_set_mode(enum clock_event_mode mode,
145 struct clock_event_device *evt)
148 case CLOCK_EVT_MODE_ONESHOT:
149 /* The only mode supported */
152 case CLOCK_EVT_MODE_PERIODIC:
153 case CLOCK_EVT_MODE_UNUSED:
154 case CLOCK_EVT_MODE_SHUTDOWN:
155 case CLOCK_EVT_MODE_RESUME:
161 unsigned int rt_timer_irq;
163 static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
165 struct clock_event_device *cd = dev_id;
166 unsigned int cpu = smp_processor_id();
167 int slice = cputoslice(cpu) == 0;
169 LOCAL_HUB_S(slice ? PI_RT_PEND_A : PI_RT_PEND_B, 0); /* Ack */
170 cd->event_handler(cd);
175 struct irqaction hub_rt_irqaction = {
176 .handler = hub_rt_counter_handler,
177 .flags = IRQF_DISABLED | IRQF_PERCPU,
182 * This is a hack; we really need to figure these values out dynamically
184 * Since 800 ns works very well with various HUB frequencies, such as
185 * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
187 * Ralf: which clock rate is used to feed the counter?
189 #define NSEC_PER_CYCLE 800
190 #define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
192 static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
193 static DEFINE_PER_CPU(char [11], hub_rt_name);
195 static void __cpuinit hub_rt_clock_event_init(void)
197 unsigned int cpu = smp_processor_id();
198 struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
199 unsigned char *name = per_cpu(hub_rt_name, cpu);
200 int irq = rt_timer_irq;
202 sprintf(name, "hub-rt %d", cpu);
204 cd->features = CLOCK_EVT_FEAT_ONESHOT,
205 clockevent_set_clock(cd, CYCLES_PER_SEC);
206 cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd);
207 cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
210 cd->cpumask = cpumask_of_cpu(cpu),
212 cd->set_next_event = rt_next_event,
213 cd->set_mode = rt_set_mode,
214 clockevents_register_device(cd);
217 static void __init hub_rt_clock_event_global_init(void)
227 irq = allocate_irqno();
229 panic("Allocation of irq number for timer failed");
230 } while (xchg(&rt_timer_irq, irq));
232 set_irq_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
233 setup_irq(irq, &hub_rt_irqaction);
236 static cycle_t hub_rt_read(void)
238 return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
241 struct clocksource hub_rt_clocksource = {
245 .mask = CLOCKSOURCE_MASK(52),
246 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
249 static void __init hub_rt_clocksource_init(void)
251 struct clocksource *cs = &hub_rt_clocksource;
253 clocksource_set_clock(cs, CYCLES_PER_SEC);
254 clocksource_register(cs);
257 void __init plat_time_init(void)
259 hub_rt_clocksource_init();
260 hub_rt_clock_event_global_init();
263 void __cpuinit cpu_time_init(void)
269 /* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */
270 board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
272 panic("Can't find board info for myself.");
274 cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
275 cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
277 panic("No information about myself?");
279 printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
281 hub_rt_clock_event_init();
282 set_c0_status(SRB_TIMOCLK);
285 void __init hub_rtc_init(cnodeid_t cnode)
288 * We only need to initialize the current node.
289 * If this is not the current node then it is a cpuless
290 * node and timeouts will not happen there.
292 if (get_compact_nodeid() == cnode) {
293 LOCAL_HUB_S(PI_RT_EN_A, 1);
294 LOCAL_HUB_S(PI_RT_EN_B, 1);
295 LOCAL_HUB_S(PI_PROF_EN_A, 0);
296 LOCAL_HUB_S(PI_PROF_EN_B, 0);
297 LOCAL_HUB_S(PI_RT_COUNT, 0);
298 LOCAL_HUB_S(PI_RT_PEND_A, 0);
299 LOCAL_HUB_S(PI_RT_PEND_B, 0);