d321796753
Historically a lot of these existed because we did not have a distinction between what was modular code and what was providing support to modules via EXPORT_SYMBOL and friends. That changed when we forked out support for the latter into the export.h file. This means we should be able to reduce the usage of module.h in code that is obj-y Makefile or bool Kconfig. The advantage in doing so is that module.h itself sources about 15 other headers; adding significantly to what we feed cpp, and it can obscure what headers we are effectively using. Since module.h was the source for init.h (for __init) and for export.h (for EXPORT_SYMBOL) we consider each change instance for the presence of either and replace as needed. An instance where module_param was used without moduleparam.h was also fixed, as well as implicit use of ptrace.h and string.h headers. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
129 lines
3 KiB
C
129 lines
3 KiB
C
/*
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* Precise Delay Loops for S390
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*
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* Copyright IBM Corp. 1999, 2008
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
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* Heiko Carstens <heiko.carstens@de.ibm.com>,
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*/
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/timex.h>
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#include <linux/export.h>
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#include <linux/irqflags.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <asm/vtimer.h>
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#include <asm/div64.h>
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#include <asm/idle.h>
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void __delay(unsigned long loops)
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{
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/*
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* To end the bloody studid and useless discussion about the
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* BogoMips number I took the liberty to define the __delay
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* function in a way that that resulting BogoMips number will
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* yield the megahertz number of the cpu. The important function
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* is udelay and that is done using the tod clock. -- martin.
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*/
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asm volatile("0: brct %0,0b" : : "d" ((loops/2) + 1));
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}
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EXPORT_SYMBOL(__delay);
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static void __udelay_disabled(unsigned long long usecs)
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{
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unsigned long cr0, cr0_new, psw_mask;
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struct s390_idle_data idle;
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u64 end;
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end = get_tod_clock() + (usecs << 12);
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__ctl_store(cr0, 0, 0);
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cr0_new = cr0 & ~CR0_IRQ_SUBCLASS_MASK;
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cr0_new |= (1UL << (63 - 52)); /* enable clock comparator irq */
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__ctl_load(cr0_new, 0, 0);
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psw_mask = __extract_psw() | PSW_MASK_EXT | PSW_MASK_WAIT;
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set_clock_comparator(end);
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set_cpu_flag(CIF_IGNORE_IRQ);
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psw_idle(&idle, psw_mask);
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clear_cpu_flag(CIF_IGNORE_IRQ);
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set_clock_comparator(S390_lowcore.clock_comparator);
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__ctl_load(cr0, 0, 0);
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}
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static void __udelay_enabled(unsigned long long usecs)
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{
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u64 clock_saved, end;
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end = get_tod_clock_fast() + (usecs << 12);
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do {
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clock_saved = 0;
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if (end < S390_lowcore.clock_comparator) {
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clock_saved = local_tick_disable();
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set_clock_comparator(end);
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}
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enabled_wait();
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if (clock_saved)
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local_tick_enable(clock_saved);
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} while (get_tod_clock_fast() < end);
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}
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/*
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* Waits for 'usecs' microseconds using the TOD clock comparator.
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*/
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void __udelay(unsigned long long usecs)
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{
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unsigned long flags;
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preempt_disable();
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local_irq_save(flags);
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if (in_irq()) {
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__udelay_disabled(usecs);
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goto out;
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}
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if (in_softirq()) {
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if (raw_irqs_disabled_flags(flags))
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__udelay_disabled(usecs);
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else
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__udelay_enabled(usecs);
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goto out;
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}
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if (raw_irqs_disabled_flags(flags)) {
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local_bh_disable();
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__udelay_disabled(usecs);
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_local_bh_enable();
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goto out;
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}
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__udelay_enabled(usecs);
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out:
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local_irq_restore(flags);
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preempt_enable();
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}
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EXPORT_SYMBOL(__udelay);
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/*
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* Simple udelay variant. To be used on startup and reboot
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* when the interrupt handler isn't working.
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*/
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void udelay_simple(unsigned long long usecs)
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{
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u64 end;
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end = get_tod_clock_fast() + (usecs << 12);
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while (get_tod_clock_fast() < end)
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cpu_relax();
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}
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void __ndelay(unsigned long long nsecs)
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{
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u64 end;
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nsecs <<= 9;
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do_div(nsecs, 125);
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end = get_tod_clock_fast() + nsecs;
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if (nsecs & ~0xfffUL)
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__udelay(nsecs >> 12);
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while (get_tod_clock_fast() < end)
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barrier();
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}
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EXPORT_SYMBOL(__ndelay);
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