290 lines
7.1 KiB
C
290 lines
7.1 KiB
C
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/*
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* interface to Blackfin CEC
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*
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* Copyright 2009 Analog Devices Inc.
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* Licensed under the GPL-2 or later.
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*/
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#ifndef __ASM_BFIN_IRQFLAGS_H__
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#define __ASM_BFIN_IRQFLAGS_H__
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#include <mach/blackfin.h>
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#ifdef CONFIG_SMP
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# include <asm/pda.h>
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# include <asm/processor.h>
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# define bfin_irq_flags cpu_pda[blackfin_core_id()].imask
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#else
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extern unsigned long bfin_irq_flags;
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#endif
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static inline notrace void bfin_sti(unsigned long flags)
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{
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asm volatile("sti %0;" : : "d" (flags));
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}
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static inline notrace unsigned long bfin_cli(void)
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{
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unsigned long flags;
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asm volatile("cli %0;" : "=d" (flags));
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return flags;
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}
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#ifdef CONFIG_DEBUG_HWERR
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# define bfin_no_irqs 0x3f
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#else
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# define bfin_no_irqs 0x1f
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#endif
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/*****************************************************************************/
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/*
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* Hard, untraced CPU interrupt flag manipulation and access.
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*/
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static inline notrace void __hard_local_irq_disable(void)
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{
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bfin_cli();
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}
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static inline notrace void __hard_local_irq_enable(void)
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{
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bfin_sti(bfin_irq_flags);
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}
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static inline notrace unsigned long hard_local_save_flags(void)
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{
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return bfin_read_IMASK();
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}
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static inline notrace unsigned long __hard_local_irq_save(void)
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{
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unsigned long flags;
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flags = bfin_cli();
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#ifdef CONFIG_DEBUG_HWERR
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bfin_sti(0x3f);
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#endif
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return flags;
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}
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static inline notrace int hard_irqs_disabled_flags(unsigned long flags)
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{
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#ifdef CONFIG_BF60x
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return (flags & IMASK_IVG11) == 0;
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#else
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return (flags & ~0x3f) == 0;
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#endif
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}
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static inline notrace int hard_irqs_disabled(void)
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{
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unsigned long flags = hard_local_save_flags();
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return hard_irqs_disabled_flags(flags);
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}
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static inline notrace void __hard_local_irq_restore(unsigned long flags)
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{
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if (!hard_irqs_disabled_flags(flags))
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__hard_local_irq_enable();
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}
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/*****************************************************************************/
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/*
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* Interrupt pipe handling.
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*/
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#ifdef CONFIG_IPIPE
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#include <linux/compiler.h>
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#include <linux/ipipe_trace.h>
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/*
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* Way too many inter-deps between low-level headers in this port, so
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* we redeclare the required bits we cannot pick from
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* <asm/ipipe_base.h> to prevent circular dependencies.
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*/
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void __ipipe_stall_root(void);
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void __ipipe_unstall_root(void);
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unsigned long __ipipe_test_root(void);
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unsigned long __ipipe_test_and_stall_root(void);
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void __ipipe_restore_root(unsigned long flags);
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#ifdef CONFIG_IPIPE_DEBUG_CONTEXT
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struct ipipe_domain;
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extern struct ipipe_domain ipipe_root;
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void ipipe_check_context(struct ipipe_domain *ipd);
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#define __check_irqop_context(ipd) ipipe_check_context(&ipipe_root)
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#else /* !CONFIG_IPIPE_DEBUG_CONTEXT */
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#define __check_irqop_context(ipd) do { } while (0)
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#endif /* !CONFIG_IPIPE_DEBUG_CONTEXT */
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/*
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* Interrupt pipe interface to linux/irqflags.h.
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*/
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static inline notrace void arch_local_irq_disable(void)
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{
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__check_irqop_context();
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__ipipe_stall_root();
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barrier();
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}
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static inline notrace void arch_local_irq_enable(void)
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{
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barrier();
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__check_irqop_context();
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__ipipe_unstall_root();
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}
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static inline notrace unsigned long arch_local_save_flags(void)
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{
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return __ipipe_test_root() ? bfin_no_irqs : bfin_irq_flags;
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}
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static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
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{
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return flags == bfin_no_irqs;
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}
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static inline notrace unsigned long arch_local_irq_save(void)
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{
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unsigned long flags;
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__check_irqop_context();
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flags = __ipipe_test_and_stall_root() ? bfin_no_irqs : bfin_irq_flags;
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barrier();
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return flags;
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}
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static inline notrace void arch_local_irq_restore(unsigned long flags)
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{
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__check_irqop_context();
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__ipipe_restore_root(flags == bfin_no_irqs);
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}
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static inline notrace unsigned long arch_mangle_irq_bits(int virt, unsigned long real)
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{
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/*
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* Merge virtual and real interrupt mask bits into a single
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* 32bit word.
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*/
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return (real & ~(1 << 31)) | ((virt != 0) << 31);
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}
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static inline notrace int arch_demangle_irq_bits(unsigned long *x)
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{
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int virt = (*x & (1 << 31)) != 0;
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*x &= ~(1L << 31);
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return virt;
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}
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/*
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* Interface to various arch routines that may be traced.
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*/
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#ifdef CONFIG_IPIPE_TRACE_IRQSOFF
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static inline notrace void hard_local_irq_disable(void)
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{
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if (!hard_irqs_disabled()) {
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__hard_local_irq_disable();
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ipipe_trace_begin(0x80000000);
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}
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}
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static inline notrace void hard_local_irq_enable(void)
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{
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if (hard_irqs_disabled()) {
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ipipe_trace_end(0x80000000);
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__hard_local_irq_enable();
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}
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}
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static inline notrace unsigned long hard_local_irq_save(void)
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{
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unsigned long flags = hard_local_save_flags();
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if (!hard_irqs_disabled_flags(flags)) {
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__hard_local_irq_disable();
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ipipe_trace_begin(0x80000001);
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}
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return flags;
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}
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static inline notrace void hard_local_irq_restore(unsigned long flags)
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{
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if (!hard_irqs_disabled_flags(flags)) {
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ipipe_trace_end(0x80000001);
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__hard_local_irq_enable();
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}
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}
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#else /* !CONFIG_IPIPE_TRACE_IRQSOFF */
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# define hard_local_irq_disable() __hard_local_irq_disable()
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# define hard_local_irq_enable() __hard_local_irq_enable()
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# define hard_local_irq_save() __hard_local_irq_save()
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# define hard_local_irq_restore(flags) __hard_local_irq_restore(flags)
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#endif /* !CONFIG_IPIPE_TRACE_IRQSOFF */
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#define hard_local_irq_save_cond() hard_local_irq_save()
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#define hard_local_irq_restore_cond(flags) hard_local_irq_restore(flags)
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#else /* !CONFIG_IPIPE */
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/*
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* Direct interface to linux/irqflags.h.
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*/
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#define arch_local_save_flags() hard_local_save_flags()
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#define arch_local_irq_save() __hard_local_irq_save()
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#define arch_local_irq_restore(flags) __hard_local_irq_restore(flags)
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#define arch_local_irq_enable() __hard_local_irq_enable()
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#define arch_local_irq_disable() __hard_local_irq_disable()
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#define arch_irqs_disabled_flags(flags) hard_irqs_disabled_flags(flags)
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#define arch_irqs_disabled() hard_irqs_disabled()
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/*
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* Interface to various arch routines that may be traced.
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*/
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#define hard_local_irq_save() __hard_local_irq_save()
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#define hard_local_irq_restore(flags) __hard_local_irq_restore(flags)
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#define hard_local_irq_enable() __hard_local_irq_enable()
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#define hard_local_irq_disable() __hard_local_irq_disable()
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#define hard_local_irq_save_cond() hard_local_save_flags()
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#define hard_local_irq_restore_cond(flags) do { (void)(flags); } while (0)
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#endif /* !CONFIG_IPIPE */
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#ifdef CONFIG_SMP
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#define hard_local_irq_save_smp() hard_local_irq_save()
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#define hard_local_irq_restore_smp(flags) hard_local_irq_restore(flags)
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#else
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#define hard_local_irq_save_smp() hard_local_save_flags()
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#define hard_local_irq_restore_smp(flags) do { (void)(flags); } while (0)
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#endif
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/*
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* Remap the arch-neutral IRQ state manipulation macros to the
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* blackfin-specific hard_local_irq_* API.
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*/
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#define local_irq_save_hw(flags) \
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do { \
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(flags) = hard_local_irq_save(); \
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} while (0)
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#define local_irq_restore_hw(flags) \
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do { \
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hard_local_irq_restore(flags); \
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} while (0)
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#define local_irq_disable_hw() \
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do { \
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hard_local_irq_disable(); \
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} while (0)
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#define local_irq_enable_hw() \
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do { \
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hard_local_irq_enable(); \
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} while (0)
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#define local_irq_save_hw_notrace(flags) \
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do { \
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(flags) = __hard_local_irq_save(); \
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} while (0)
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#define local_irq_restore_hw_notrace(flags) \
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do { \
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__hard_local_irq_restore(flags); \
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} while (0)
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#define irqs_disabled_hw() hard_irqs_disabled()
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#endif
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