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

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
  4  * Copytight (C) 1999, 2000 Silicon Graphics, Inc.
  5  */
  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 /* Includes for ioc3_init().  */
 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          * Ack
 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 };
 78 
 79 /*
 80  * This is a hack; we really need to figure these values out dynamically
 81  *
 82  * Since 800 ns works very well with various HUB frequencies, such as
 83  * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
 84  *
 85  * Ralf: which clock rate is used to feed the counter?
 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         /* Don't use ARCS.  ARCS is fragile.  Klconfig is simple and sane.  */
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          * We only need to initialize the current node.
178          * If this is not the current node then it is a cpuless
179          * node and timeouts will not happen there.
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 
206 /*
207  * kludge make this a device_initcall after ioc3 resource conflicts
208  * are resolved
209  */
210 late_initcall(sgi_ip27_rtc_devinit);
211 

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