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078a55fc82
commit 3747069b25e419f6b51395f48127e9812abc3596 upstream.
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0
("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings. In any case, they are temporary and harmless.
Here, we remove all the MIPS __cpuinit from C code and __CPUINIT
from asm files. MIPS is interesting in this respect, because there
are also uasm users hiding behind their own renamed versions of the
__cpuinit macros.
[1] https://lkml.org/lkml/2013/5/20/589
[ralf@linux-mips.org: Folded in Paul's followup fix.]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5494/
Patchwork: https://patchwork.linux-mips.org/patch/5495/
Patchwork: https://patchwork.linux-mips.org/patch/5509/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
235 lines
5.5 KiB
C
235 lines
5.5 KiB
C
/*
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* Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
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* Copytight (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#include <linux/bcd.h>
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#include <linux/clockchips.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/param.h>
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#include <linux/smp.h>
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#include <linux/time.h>
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#include <linux/timex.h>
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#include <linux/mm.h>
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#include <linux/platform_device.h>
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#include <asm/time.h>
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#include <asm/pgtable.h>
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#include <asm/sgialib.h>
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#include <asm/sn/ioc3.h>
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#include <asm/sn/klconfig.h>
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#include <asm/sn/arch.h>
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#include <asm/sn/addrs.h>
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#include <asm/sn/sn_private.h>
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#include <asm/sn/sn0/ip27.h>
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#include <asm/sn/sn0/hub.h>
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#define TICK_SIZE (tick_nsec / 1000)
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/* Includes for ioc3_init(). */
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#include <asm/sn/types.h>
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#include <asm/sn/sn0/addrs.h>
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#include <asm/sn/sn0/hubni.h>
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#include <asm/sn/sn0/hubio.h>
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#include <asm/pci/bridge.h>
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static void enable_rt_irq(struct irq_data *d)
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{
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}
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static void disable_rt_irq(struct irq_data *d)
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{
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}
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static struct irq_chip rt_irq_type = {
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.name = "SN HUB RT timer",
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.irq_mask = disable_rt_irq,
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.irq_unmask = enable_rt_irq,
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};
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static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
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{
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unsigned int cpu = smp_processor_id();
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int slice = cputoslice(cpu);
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unsigned long cnt;
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cnt = LOCAL_HUB_L(PI_RT_COUNT);
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cnt += delta;
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LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
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return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
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}
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static void rt_set_mode(enum clock_event_mode mode,
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struct clock_event_device *evt)
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{
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/* Nothing to do ... */
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}
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unsigned int rt_timer_irq;
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static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
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static DEFINE_PER_CPU(char [11], hub_rt_name);
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static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
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{
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unsigned int cpu = smp_processor_id();
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struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
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int slice = cputoslice(cpu);
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/*
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* Ack
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*/
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LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
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cd->event_handler(cd);
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return IRQ_HANDLED;
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}
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struct irqaction hub_rt_irqaction = {
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.handler = hub_rt_counter_handler,
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.flags = IRQF_PERCPU | IRQF_TIMER,
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.name = "hub-rt",
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};
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/*
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* This is a hack; we really need to figure these values out dynamically
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*
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* Since 800 ns works very well with various HUB frequencies, such as
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* 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
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*
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* Ralf: which clock rate is used to feed the counter?
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*/
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#define NSEC_PER_CYCLE 800
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#define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
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void hub_rt_clock_event_init(void)
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{
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unsigned int cpu = smp_processor_id();
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struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
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unsigned char *name = per_cpu(hub_rt_name, cpu);
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int irq = rt_timer_irq;
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sprintf(name, "hub-rt %d", cpu);
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cd->name = name;
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cd->features = CLOCK_EVT_FEAT_ONESHOT;
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clockevent_set_clock(cd, CYCLES_PER_SEC);
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cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd);
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cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
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cd->rating = 200;
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cd->irq = irq;
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cd->cpumask = cpumask_of(cpu);
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cd->set_next_event = rt_next_event;
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cd->set_mode = rt_set_mode;
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clockevents_register_device(cd);
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}
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static void __init hub_rt_clock_event_global_init(void)
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{
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int irq;
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do {
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smp_wmb();
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irq = rt_timer_irq;
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if (irq)
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break;
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irq = allocate_irqno();
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if (irq < 0)
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panic("Allocation of irq number for timer failed");
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} while (xchg(&rt_timer_irq, irq));
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irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
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setup_irq(irq, &hub_rt_irqaction);
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}
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static cycle_t hub_rt_read(struct clocksource *cs)
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{
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return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
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}
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struct clocksource hub_rt_clocksource = {
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.name = "HUB-RT",
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.rating = 200,
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.read = hub_rt_read,
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.mask = CLOCKSOURCE_MASK(52),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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static void __init hub_rt_clocksource_init(void)
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{
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struct clocksource *cs = &hub_rt_clocksource;
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clocksource_register_hz(cs, CYCLES_PER_SEC);
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}
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void __init plat_time_init(void)
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{
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hub_rt_clocksource_init();
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hub_rt_clock_event_global_init();
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hub_rt_clock_event_init();
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}
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void cpu_time_init(void)
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{
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lboard_t *board;
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klcpu_t *cpu;
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int cpuid;
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/* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */
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board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
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if (!board)
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panic("Can't find board info for myself.");
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cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
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cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
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if (!cpu)
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panic("No information about myself?");
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printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
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set_c0_status(SRB_TIMOCLK);
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}
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void hub_rtc_init(cnodeid_t cnode)
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{
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/*
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* We only need to initialize the current node.
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* If this is not the current node then it is a cpuless
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* node and timeouts will not happen there.
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*/
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if (get_compact_nodeid() == cnode) {
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LOCAL_HUB_S(PI_RT_EN_A, 1);
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LOCAL_HUB_S(PI_RT_EN_B, 1);
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LOCAL_HUB_S(PI_PROF_EN_A, 0);
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LOCAL_HUB_S(PI_PROF_EN_B, 0);
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LOCAL_HUB_S(PI_RT_COUNT, 0);
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LOCAL_HUB_S(PI_RT_PEND_A, 0);
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LOCAL_HUB_S(PI_RT_PEND_B, 0);
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}
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}
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static int __init sgi_ip27_rtc_devinit(void)
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{
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struct resource res;
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memset(&res, 0, sizeof(res));
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res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base +
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IOC3_BYTEBUS_DEV0);
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res.end = res.start + 32767;
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res.flags = IORESOURCE_MEM;
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return IS_ERR(platform_device_register_simple("rtc-m48t35", -1,
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&res, 1));
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}
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/*
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* kludge make this a device_initcall after ioc3 resource conflicts
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* are resolved
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*/
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late_initcall(sgi_ip27_rtc_devinit);
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