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