summaryrefslogtreecommitdiff
path: root/arch/blackfin/include/asm/irqflags.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/blackfin/include/asm/irqflags.h')
-rw-r--r--arch/blackfin/include/asm/irqflags.h289
1 files changed, 289 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/irqflags.h b/arch/blackfin/include/asm/irqflags.h
new file mode 100644
index 000000000..07aff230a
--- /dev/null
+++ b/arch/blackfin/include/asm/irqflags.h
@@ -0,0 +1,289 @@
+/*
+ * interface to Blackfin CEC
+ *
+ * Copyright 2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __ASM_BFIN_IRQFLAGS_H__
+#define __ASM_BFIN_IRQFLAGS_H__
+
+#include <mach/blackfin.h>
+
+#ifdef CONFIG_SMP
+# include <asm/pda.h>
+# include <asm/processor.h>
+# define bfin_irq_flags cpu_pda[blackfin_core_id()].imask
+#else
+extern unsigned long bfin_irq_flags;
+#endif
+
+static inline notrace void bfin_sti(unsigned long flags)
+{
+ asm volatile("sti %0;" : : "d" (flags));
+}
+
+static inline notrace unsigned long bfin_cli(void)
+{
+ unsigned long flags;
+ asm volatile("cli %0;" : "=d" (flags));
+ return flags;
+}
+
+#ifdef CONFIG_DEBUG_HWERR
+# define bfin_no_irqs 0x3f
+#else
+# define bfin_no_irqs 0x1f
+#endif
+
+/*****************************************************************************/
+/*
+ * Hard, untraced CPU interrupt flag manipulation and access.
+ */
+static inline notrace void __hard_local_irq_disable(void)
+{
+ bfin_cli();
+}
+
+static inline notrace void __hard_local_irq_enable(void)
+{
+ bfin_sti(bfin_irq_flags);
+}
+
+static inline notrace unsigned long hard_local_save_flags(void)
+{
+ return bfin_read_IMASK();
+}
+
+static inline notrace unsigned long __hard_local_irq_save(void)
+{
+ unsigned long flags;
+ flags = bfin_cli();
+#ifdef CONFIG_DEBUG_HWERR
+ bfin_sti(0x3f);
+#endif
+ return flags;
+}
+
+static inline notrace int hard_irqs_disabled_flags(unsigned long flags)
+{
+#ifdef CONFIG_BF60x
+ return (flags & IMASK_IVG11) == 0;
+#else
+ return (flags & ~0x3f) == 0;
+#endif
+}
+
+static inline notrace int hard_irqs_disabled(void)
+{
+ unsigned long flags = hard_local_save_flags();
+ return hard_irqs_disabled_flags(flags);
+}
+
+static inline notrace void __hard_local_irq_restore(unsigned long flags)
+{
+ if (!hard_irqs_disabled_flags(flags))
+ __hard_local_irq_enable();
+}
+
+/*****************************************************************************/
+/*
+ * Interrupt pipe handling.
+ */
+#ifdef CONFIG_IPIPE
+
+#include <linux/compiler.h>
+#include <linux/ipipe_trace.h>
+/*
+ * Way too many inter-deps between low-level headers in this port, so
+ * we redeclare the required bits we cannot pick from
+ * <asm/ipipe_base.h> to prevent circular dependencies.
+ */
+void __ipipe_stall_root(void);
+void __ipipe_unstall_root(void);
+unsigned long __ipipe_test_root(void);
+unsigned long __ipipe_test_and_stall_root(void);
+void __ipipe_restore_root(unsigned long flags);
+
+#ifdef CONFIG_IPIPE_DEBUG_CONTEXT
+struct ipipe_domain;
+extern struct ipipe_domain ipipe_root;
+void ipipe_check_context(struct ipipe_domain *ipd);
+#define __check_irqop_context(ipd) ipipe_check_context(&ipipe_root)
+#else /* !CONFIG_IPIPE_DEBUG_CONTEXT */
+#define __check_irqop_context(ipd) do { } while (0)
+#endif /* !CONFIG_IPIPE_DEBUG_CONTEXT */
+
+/*
+ * Interrupt pipe interface to linux/irqflags.h.
+ */
+static inline notrace void arch_local_irq_disable(void)
+{
+ __check_irqop_context();
+ __ipipe_stall_root();
+ barrier();
+}
+
+static inline notrace void arch_local_irq_enable(void)
+{
+ barrier();
+ __check_irqop_context();
+ __ipipe_unstall_root();
+}
+
+static inline notrace unsigned long arch_local_save_flags(void)
+{
+ return __ipipe_test_root() ? bfin_no_irqs : bfin_irq_flags;
+}
+
+static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
+{
+ return flags == bfin_no_irqs;
+}
+
+static inline notrace unsigned long arch_local_irq_save(void)
+{
+ unsigned long flags;
+
+ __check_irqop_context();
+ flags = __ipipe_test_and_stall_root() ? bfin_no_irqs : bfin_irq_flags;
+ barrier();
+
+ return flags;
+}
+
+static inline notrace void arch_local_irq_restore(unsigned long flags)
+{
+ __check_irqop_context();
+ __ipipe_restore_root(flags == bfin_no_irqs);
+}
+
+static inline notrace unsigned long arch_mangle_irq_bits(int virt, unsigned long real)
+{
+ /*
+ * Merge virtual and real interrupt mask bits into a single
+ * 32bit word.
+ */
+ return (real & ~(1 << 31)) | ((virt != 0) << 31);
+}
+
+static inline notrace int arch_demangle_irq_bits(unsigned long *x)
+{
+ int virt = (*x & (1 << 31)) != 0;
+ *x &= ~(1L << 31);
+ return virt;
+}
+
+/*
+ * Interface to various arch routines that may be traced.
+ */
+#ifdef CONFIG_IPIPE_TRACE_IRQSOFF
+static inline notrace void hard_local_irq_disable(void)
+{
+ if (!hard_irqs_disabled()) {
+ __hard_local_irq_disable();
+ ipipe_trace_begin(0x80000000);
+ }
+}
+
+static inline notrace void hard_local_irq_enable(void)
+{
+ if (hard_irqs_disabled()) {
+ ipipe_trace_end(0x80000000);
+ __hard_local_irq_enable();
+ }
+}
+
+static inline notrace unsigned long hard_local_irq_save(void)
+{
+ unsigned long flags = hard_local_save_flags();
+ if (!hard_irqs_disabled_flags(flags)) {
+ __hard_local_irq_disable();
+ ipipe_trace_begin(0x80000001);
+ }
+ return flags;
+}
+
+static inline notrace void hard_local_irq_restore(unsigned long flags)
+{
+ if (!hard_irqs_disabled_flags(flags)) {
+ ipipe_trace_end(0x80000001);
+ __hard_local_irq_enable();
+ }
+}
+
+#else /* !CONFIG_IPIPE_TRACE_IRQSOFF */
+# define hard_local_irq_disable() __hard_local_irq_disable()
+# define hard_local_irq_enable() __hard_local_irq_enable()
+# define hard_local_irq_save() __hard_local_irq_save()
+# define hard_local_irq_restore(flags) __hard_local_irq_restore(flags)
+#endif /* !CONFIG_IPIPE_TRACE_IRQSOFF */
+
+#define hard_local_irq_save_cond() hard_local_irq_save()
+#define hard_local_irq_restore_cond(flags) hard_local_irq_restore(flags)
+
+#else /* !CONFIG_IPIPE */
+
+/*
+ * Direct interface to linux/irqflags.h.
+ */
+#define arch_local_save_flags() hard_local_save_flags()
+#define arch_local_irq_save() __hard_local_irq_save()
+#define arch_local_irq_restore(flags) __hard_local_irq_restore(flags)
+#define arch_local_irq_enable() __hard_local_irq_enable()
+#define arch_local_irq_disable() __hard_local_irq_disable()
+#define arch_irqs_disabled_flags(flags) hard_irqs_disabled_flags(flags)
+#define arch_irqs_disabled() hard_irqs_disabled()
+
+/*
+ * Interface to various arch routines that may be traced.
+ */
+#define hard_local_irq_save() __hard_local_irq_save()
+#define hard_local_irq_restore(flags) __hard_local_irq_restore(flags)
+#define hard_local_irq_enable() __hard_local_irq_enable()
+#define hard_local_irq_disable() __hard_local_irq_disable()
+#define hard_local_irq_save_cond() hard_local_save_flags()
+#define hard_local_irq_restore_cond(flags) do { (void)(flags); } while (0)
+
+#endif /* !CONFIG_IPIPE */
+
+#ifdef CONFIG_SMP
+#define hard_local_irq_save_smp() hard_local_irq_save()
+#define hard_local_irq_restore_smp(flags) hard_local_irq_restore(flags)
+#else
+#define hard_local_irq_save_smp() hard_local_save_flags()
+#define hard_local_irq_restore_smp(flags) do { (void)(flags); } while (0)
+#endif
+
+/*
+ * Remap the arch-neutral IRQ state manipulation macros to the
+ * blackfin-specific hard_local_irq_* API.
+ */
+#define local_irq_save_hw(flags) \
+ do { \
+ (flags) = hard_local_irq_save(); \
+ } while (0)
+#define local_irq_restore_hw(flags) \
+ do { \
+ hard_local_irq_restore(flags); \
+ } while (0)
+#define local_irq_disable_hw() \
+ do { \
+ hard_local_irq_disable(); \
+ } while (0)
+#define local_irq_enable_hw() \
+ do { \
+ hard_local_irq_enable(); \
+ } while (0)
+#define local_irq_save_hw_notrace(flags) \
+ do { \
+ (flags) = __hard_local_irq_save(); \
+ } while (0)
+#define local_irq_restore_hw_notrace(flags) \
+ do { \
+ __hard_local_irq_restore(flags); \
+ } while (0)
+
+#define irqs_disabled_hw() hard_irqs_disabled()
+
+#endif