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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/sched_clock.h>
 11 #include <linux/interrupt.h>
 12 #include <linux/kernel_stat.h>
 13 #include <linux/param.h>
 14 #include <linux/smp.h>
 15 #include <linux/time.h>
 16 #include <linux/timex.h>
 17 #include <linux/mm.h>
 18 #include <linux/platform_device.h>
 19 
 20 #include <asm/time.h>
 21 #include <asm/pgtable.h>
 22 #include <asm/sgialib.h>
 23 #include <asm/sn/ioc3.h>
 24 #include <asm/sn/klconfig.h>
 25 #include <asm/sn/arch.h>
 26 #include <asm/sn/addrs.h>
 27 #include <asm/sn/sn_private.h>
 28 #include <asm/sn/sn0/ip27.h>
 29 #include <asm/sn/sn0/hub.h>
 30 
 31 #define TICK_SIZE (tick_nsec / 1000)
 32 
 33 /* Includes for ioc3_init().  */
 34 #include <asm/sn/types.h>
 35 #include <asm/sn/sn0/addrs.h>
 36 #include <asm/sn/sn0/hubni.h>
 37 #include <asm/sn/sn0/hubio.h>
 38 #include <asm/pci/bridge.h>
 39 
 40 static void enable_rt_irq(struct irq_data *d)
 41 {
 42 }
 43 
 44 static void disable_rt_irq(struct irq_data *d)
 45 {
 46 }
 47 
 48 static struct irq_chip rt_irq_type = {
 49         .name           = "SN HUB RT timer",
 50         .irq_mask       = disable_rt_irq,
 51         .irq_unmask     = enable_rt_irq,
 52 };
 53 
 54 static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
 55 {
 56         unsigned int cpu = smp_processor_id();
 57         int slice = cputoslice(cpu);
 58         unsigned long cnt;
 59 
 60         cnt = LOCAL_HUB_L(PI_RT_COUNT);
 61         cnt += delta;
 62         LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
 63 
 64         return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
 65 }
 66 
 67 unsigned int rt_timer_irq;
 68 
 69 static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
 70 static DEFINE_PER_CPU(char [11], hub_rt_name);
 71 
 72 static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
 73 {
 74         unsigned int cpu = smp_processor_id();
 75         struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
 76         int slice = cputoslice(cpu);
 77 
 78         /*
 79          * Ack
 80          */
 81         LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
 82         cd->event_handler(cd);
 83 
 84         return IRQ_HANDLED;
 85 }
 86 
 87 struct irqaction hub_rt_irqaction = {
 88         .handler        = hub_rt_counter_handler,
 89         .flags          = IRQF_PERCPU | IRQF_TIMER,
 90         .name           = "hub-rt",
 91 };
 92 
 93 /*
 94  * This is a hack; we really need to figure these values out dynamically
 95  *
 96  * Since 800 ns works very well with various HUB frequencies, such as
 97  * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
 98  *
 99  * Ralf: which clock rate is used to feed the counter?
100  */
101 #define NSEC_PER_CYCLE          800
102 #define CYCLES_PER_SEC          (NSEC_PER_SEC / NSEC_PER_CYCLE)
103 
104 void hub_rt_clock_event_init(void)
105 {
106         unsigned int cpu = smp_processor_id();
107         struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
108         unsigned char *name = per_cpu(hub_rt_name, cpu);
109         int irq = rt_timer_irq;
110 
111         sprintf(name, "hub-rt %d", cpu);
112         cd->name                = name;
113         cd->features            = CLOCK_EVT_FEAT_ONESHOT;
114         clockevent_set_clock(cd, CYCLES_PER_SEC);
115         cd->max_delta_ns        = clockevent_delta2ns(0xfffffffffffff, cd);
116         cd->min_delta_ns        = clockevent_delta2ns(0x300, cd);
117         cd->rating              = 200;
118         cd->irq                 = irq;
119         cd->cpumask             = cpumask_of(cpu);
120         cd->set_next_event      = rt_next_event;
121         clockevents_register_device(cd);
122 }
123 
124 static void __init hub_rt_clock_event_global_init(void)
125 {
126         int irq;
127 
128         do {
129                 smp_wmb();
130                 irq = rt_timer_irq;
131                 if (irq)
132                         break;
133 
134                 irq = allocate_irqno();
135                 if (irq < 0)
136                         panic("Allocation of irq number for timer failed");
137         } while (xchg(&rt_timer_irq, irq));
138 
139         irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
140         setup_irq(irq, &hub_rt_irqaction);
141 }
142 
143 static cycle_t hub_rt_read(struct clocksource *cs)
144 {
145         return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
146 }
147 
148 struct clocksource hub_rt_clocksource = {
149         .name   = "HUB-RT",
150         .rating = 200,
151         .read   = hub_rt_read,
152         .mask   = CLOCKSOURCE_MASK(52),
153         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
154 };
155 
156 static u64 notrace hub_rt_read_sched_clock(void)
157 {
158         return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
159 }
160 
161 static void __init hub_rt_clocksource_init(void)
162 {
163         struct clocksource *cs = &hub_rt_clocksource;
164 
165         clocksource_register_hz(cs, CYCLES_PER_SEC);
166 
167         sched_clock_register(hub_rt_read_sched_clock, 52, CYCLES_PER_SEC);
168 }
169 
170 void __init plat_time_init(void)
171 {
172         hub_rt_clocksource_init();
173         hub_rt_clock_event_global_init();
174         hub_rt_clock_event_init();
175 }
176 
177 void cpu_time_init(void)
178 {
179         lboard_t *board;
180         klcpu_t *cpu;
181         int cpuid;
182 
183         /* Don't use ARCS.  ARCS is fragile.  Klconfig is simple and sane.  */
184         board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
185         if (!board)
186                 panic("Can't find board info for myself.");
187 
188         cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
189         cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
190         if (!cpu)
191                 panic("No information about myself?");
192 
193         printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
194 
195         set_c0_status(SRB_TIMOCLK);
196 }
197 
198 void hub_rtc_init(cnodeid_t cnode)
199 {
200 
201         /*
202          * We only need to initialize the current node.
203          * If this is not the current node then it is a cpuless
204          * node and timeouts will not happen there.
205          */
206         if (get_compact_nodeid() == cnode) {
207                 LOCAL_HUB_S(PI_RT_EN_A, 1);
208                 LOCAL_HUB_S(PI_RT_EN_B, 1);
209                 LOCAL_HUB_S(PI_PROF_EN_A, 0);
210                 LOCAL_HUB_S(PI_PROF_EN_B, 0);
211                 LOCAL_HUB_S(PI_RT_COUNT, 0);
212                 LOCAL_HUB_S(PI_RT_PEND_A, 0);
213                 LOCAL_HUB_S(PI_RT_PEND_B, 0);
214         }
215 }
216 
217 static int __init sgi_ip27_rtc_devinit(void)
218 {
219         struct resource res;
220 
221         memset(&res, 0, sizeof(res));
222         res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base +
223                               IOC3_BYTEBUS_DEV0);
224         res.end = res.start + 32767;
225         res.flags = IORESOURCE_MEM;
226 
227         return IS_ERR(platform_device_register_simple("rtc-m48t35", -1,
228                                                       &res, 1));
229 }
230 
231 /*
232  * kludge make this a device_initcall after ioc3 resource conflicts
233  * are resolved
234  */
235 late_initcall(sgi_ip27_rtc_devinit);
236 

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