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Linux/arch/mips/sgi-ip27/ip27-timer.c

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  1 /*
  2  * Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
  3  * Copytight (C) 1999, 2000 Silicon Graphics, Inc.
  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 /* Includes for ioc3_init().  */
 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 
 39 static void enable_rt_irq(struct irq_data *d)
 40 {
 41 }
 42 
 43 static void disable_rt_irq(struct irq_data *d)
 44 {
 45 }
 46 
 47 static struct irq_chip rt_irq_type = {
 48         .name           = "SN HUB RT timer",
 49         .irq_mask       = disable_rt_irq,
 50         .irq_unmask     = enable_rt_irq,
 51 };
 52 
 53 static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
 54 {
 55         unsigned int cpu = smp_processor_id();
 56         int slice = cputoslice(cpu);
 57         unsigned long cnt;
 58 
 59         cnt = LOCAL_HUB_L(PI_RT_COUNT);
 60         cnt += delta;
 61         LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
 62 
 63         return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
 64 }
 65 
 66 static void rt_set_mode(enum clock_event_mode mode,
 67                 struct clock_event_device *evt)
 68 {
 69         /* Nothing to do ...  */
 70 }
 71 
 72 unsigned int rt_timer_irq;
 73 
 74 static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
 75 static DEFINE_PER_CPU(char [11], hub_rt_name);
 76 
 77 static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
 78 {
 79         unsigned int cpu = smp_processor_id();
 80         struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
 81         int slice = cputoslice(cpu);
 82 
 83         /*
 84          * Ack
 85          */
 86         LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
 87         cd->event_handler(cd);
 88 
 89         return IRQ_HANDLED;
 90 }
 91 
 92 struct irqaction hub_rt_irqaction = {
 93         .handler        = hub_rt_counter_handler,
 94         .flags          = IRQF_PERCPU | IRQF_TIMER,
 95         .name           = "hub-rt",
 96 };
 97 
 98 /*
 99  * This is a hack; we really need to figure these values out dynamically
100  *
101  * Since 800 ns works very well with various HUB frequencies, such as
102  * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
103  *
104  * Ralf: which clock rate is used to feed the counter?
105  */
106 #define NSEC_PER_CYCLE          800
107 #define CYCLES_PER_SEC          (NSEC_PER_SEC / NSEC_PER_CYCLE)
108 
109 void __cpuinit hub_rt_clock_event_init(void)
110 {
111         unsigned int cpu = smp_processor_id();
112         struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
113         unsigned char *name = per_cpu(hub_rt_name, cpu);
114         int irq = rt_timer_irq;
115 
116         sprintf(name, "hub-rt %d", cpu);
117         cd->name                = name;
118         cd->features            = CLOCK_EVT_FEAT_ONESHOT;
119         clockevent_set_clock(cd, CYCLES_PER_SEC);
120         cd->max_delta_ns        = clockevent_delta2ns(0xfffffffffffff, cd);
121         cd->min_delta_ns        = clockevent_delta2ns(0x300, cd);
122         cd->rating              = 200;
123         cd->irq                 = irq;
124         cd->cpumask             = cpumask_of(cpu);
125         cd->set_next_event      = rt_next_event;
126         cd->set_mode            = rt_set_mode;
127         clockevents_register_device(cd);
128 }
129 
130 static void __init hub_rt_clock_event_global_init(void)
131 {
132         int irq;
133 
134         do {
135                 smp_wmb();
136                 irq = rt_timer_irq;
137                 if (irq)
138                         break;
139 
140                 irq = allocate_irqno();
141                 if (irq < 0)
142                         panic("Allocation of irq number for timer failed");
143         } while (xchg(&rt_timer_irq, irq));
144 
145         irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
146         setup_irq(irq, &hub_rt_irqaction);
147 }
148 
149 static cycle_t hub_rt_read(struct clocksource *cs)
150 {
151         return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
152 }
153 
154 struct clocksource hub_rt_clocksource = {
155         .name   = "HUB-RT",
156         .rating = 200,
157         .read   = hub_rt_read,
158         .mask   = CLOCKSOURCE_MASK(52),
159         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
160 };
161 
162 static void __init hub_rt_clocksource_init(void)
163 {
164         struct clocksource *cs = &hub_rt_clocksource;
165 
166         clocksource_register_hz(cs, CYCLES_PER_SEC);
167 }
168 
169 void __init plat_time_init(void)
170 {
171         hub_rt_clocksource_init();
172         hub_rt_clock_event_global_init();
173         hub_rt_clock_event_init();
174 }
175 
176 void __cpuinit cpu_time_init(void)
177 {
178         lboard_t *board;
179         klcpu_t *cpu;
180         int cpuid;
181 
182         /* Don't use ARCS.  ARCS is fragile.  Klconfig is simple and sane.  */
183         board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
184         if (!board)
185                 panic("Can't find board info for myself.");
186 
187         cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
188         cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
189         if (!cpu)
190                 panic("No information about myself?");
191 
192         printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
193 
194         set_c0_status(SRB_TIMOCLK);
195 }
196 
197 void __cpuinit hub_rtc_init(cnodeid_t cnode)
198 {
199 
200         /*
201          * We only need to initialize the current node.
202          * If this is not the current node then it is a cpuless
203          * node and timeouts will not happen there.
204          */
205         if (get_compact_nodeid() == cnode) {
206                 LOCAL_HUB_S(PI_RT_EN_A, 1);
207                 LOCAL_HUB_S(PI_RT_EN_B, 1);
208                 LOCAL_HUB_S(PI_PROF_EN_A, 0);
209                 LOCAL_HUB_S(PI_PROF_EN_B, 0);
210                 LOCAL_HUB_S(PI_RT_COUNT, 0);
211                 LOCAL_HUB_S(PI_RT_PEND_A, 0);
212                 LOCAL_HUB_S(PI_RT_PEND_B, 0);
213         }
214 }
215 
216 static int __init sgi_ip27_rtc_devinit(void)
217 {
218         struct resource res;
219 
220         memset(&res, 0, sizeof(res));
221         res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base +
222                               IOC3_BYTEBUS_DEV0);
223         res.end = res.start + 32767;
224         res.flags = IORESOURCE_MEM;
225 
226         return IS_ERR(platform_device_register_simple("rtc-m48t35", -1,
227                                                       &res, 1));
228 }
229 
230 /*
231  * kludge make this a device_initcall after ioc3 resource conflicts
232  * are resolved
233  */
234 late_initcall(sgi_ip27_rtc_devinit);
235 

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