From 06ecc190f3928850cb77c498f745fc8e9a7e2fd7 Mon Sep 17 00:00:00 2001
From: Philippe Gerum <rpm@xenomai.org>
Date: Tue, 16 Jun 2009 05:25:37 +0200
Subject: Blackfin: convert interrupt pipeline to irqflags

Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 arch/blackfin/include/asm/irqflags.h | 164 +++++++++++++++++++++++++++++++++--
 1 file changed, 158 insertions(+), 6 deletions(-)

(limited to 'arch/blackfin/include/asm/irqflags.h')

diff --git a/arch/blackfin/include/asm/irqflags.h b/arch/blackfin/include/asm/irqflags.h
index 139cba4651b1..9b19a19d9ae9 100644
--- a/arch/blackfin/include/asm/irqflags.h
+++ b/arch/blackfin/include/asm/irqflags.h
@@ -31,6 +31,150 @@ static inline unsigned long bfin_cli(void)
 	return flags;
 }
 
+#ifdef CONFIG_IPIPE
+
+#include <linux/ipipe_base.h>
+#include <linux/ipipe_trace.h>
+
+#ifdef CONFIG_DEBUG_HWERR
+# define bfin_no_irqs 0x3f
+#else
+# define bfin_no_irqs 0x1f
+#endif
+
+#define raw_local_irq_disable()				\
+	do {						\
+		ipipe_check_context(ipipe_root_domain);	\
+		__ipipe_stall_root();			\
+		barrier();				\
+	} while (0)
+
+static inline void raw_local_irq_enable(void)
+{
+	barrier();
+	ipipe_check_context(ipipe_root_domain);
+	__ipipe_unstall_root();
+}
+
+#define raw_local_save_flags_ptr(x)					\
+	do {								\
+		*(x) = __ipipe_test_root() ? bfin_no_irqs : bfin_irq_flags; \
+	} while (0)
+
+#define raw_local_save_flags(x)		raw_local_save_flags_ptr(&(x))
+
+#define raw_irqs_disabled_flags(x)	((x) == bfin_no_irqs)
+
+#define raw_local_irq_save_ptr(x)					\
+	do {								\
+		*(x) = __ipipe_test_and_stall_root() ? bfin_no_irqs : bfin_irq_flags; \
+		barrier();						\
+	} while (0)
+
+#define raw_local_irq_save(x)				\
+	do {						\
+		ipipe_check_context(ipipe_root_domain);	\
+		raw_local_irq_save_ptr(&(x));		\
+	} while (0)
+
+static inline unsigned long raw_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 int raw_demangle_irq_bits(unsigned long *x)
+{
+	int virt = (*x & (1 << 31)) != 0;
+	*x &= ~(1L << 31);
+	return virt;
+}
+
+static inline void local_irq_disable_hw_notrace(void)
+{
+	bfin_cli();
+}
+
+static inline void local_irq_enable_hw_notrace(void)
+{
+	bfin_sti(bfin_irq_flags);
+}
+
+#define local_save_flags_hw(flags)			\
+	do {						\
+		(flags) = bfin_read_IMASK();		\
+	} while (0)
+
+#define irqs_disabled_flags_hw(flags) (((flags) & ~0x3f) == 0)
+
+#define irqs_disabled_hw()			\
+	({					\
+	unsigned long flags;			\
+	local_save_flags_hw(flags);		\
+	irqs_disabled_flags_hw(flags);		\
+	})
+
+static inline void local_irq_save_ptr_hw(unsigned long *flags)
+{
+	*flags = bfin_cli();
+#ifdef CONFIG_DEBUG_HWERR
+	bfin_sti(0x3f);
+#endif
+}
+
+#define local_irq_save_hw_notrace(flags)		\
+	do {						\
+		local_irq_save_ptr_hw(&(flags));	\
+	} while (0)
+
+static inline void local_irq_restore_hw_notrace(unsigned long flags)
+{
+	if (!irqs_disabled_flags_hw(flags))
+		local_irq_enable_hw_notrace();
+}
+
+#ifdef CONFIG_IPIPE_TRACE_IRQSOFF
+# define local_irq_disable_hw()				\
+	do {						\
+		if (!irqs_disabled_hw()) {		\
+			local_irq_disable_hw_notrace();	\
+			ipipe_trace_begin(0x80000000);	\
+		}					\
+	} while (0)
+# define local_irq_enable_hw()				\
+	do {						\
+		if (irqs_disabled_hw()) {		\
+			ipipe_trace_end(0x80000000);	\
+			local_irq_enable_hw_notrace();	\
+		}					\
+	} while (0)
+# define local_irq_save_hw(flags)			\
+	do {						\
+		local_save_flags_hw(flags);		\
+		if (!irqs_disabled_flags_hw(flags)) {	\
+			local_irq_disable_hw_notrace();	\
+			ipipe_trace_begin(0x80000001);	\
+		}					\
+	} while (0)
+# define local_irq_restore_hw(flags)			\
+	do {						\
+		if (!irqs_disabled_flags_hw(flags)) {	\
+			ipipe_trace_end(0x80000001);	\
+			local_irq_enable_hw_notrace();	\
+		}					\
+	} while (0)
+#else /* !CONFIG_IPIPE_TRACE_IRQSOFF */
+# define local_irq_disable_hw()		local_irq_disable_hw_notrace()
+# define local_irq_enable_hw()		local_irq_enable_hw_notrace()
+# define local_irq_save_hw(flags)	local_irq_save_hw_notrace(flags)
+# define local_irq_restore_hw(flags)	local_irq_restore_hw_notrace(flags)
+#endif /* !CONFIG_IPIPE_TRACE_IRQSOFF */
+
+#else /* CONFIG_IPIPE */
+
 static inline void raw_local_irq_disable(void)
 {
 	bfin_cli();
@@ -44,12 +188,6 @@ static inline void raw_local_irq_enable(void)
 
 #define raw_irqs_disabled_flags(flags) (((flags) & ~0x3f) == 0)
 
-static inline void raw_local_irq_restore(unsigned long flags)
-{
-	if (!raw_irqs_disabled_flags(flags))
-		raw_local_irq_enable();
-}
-
 static inline unsigned long __raw_local_irq_save(void)
 {
 	unsigned long flags = bfin_cli();
@@ -60,4 +198,18 @@ static inline unsigned long __raw_local_irq_save(void)
 }
 #define raw_local_irq_save(flags) do { (flags) = __raw_local_irq_save(); } while (0)
 
+#define local_irq_save_hw(flags)	raw_local_irq_save(flags)
+#define local_irq_restore_hw(flags)	raw_local_irq_restore(flags)
+#define local_irq_enable_hw()		raw_local_irq_enable()
+#define local_irq_disable_hw()		raw_local_irq_disable()
+#define irqs_disabled_hw()		irqs_disabled()
+
+#endif /* !CONFIG_IPIPE */
+
+static inline void raw_local_irq_restore(unsigned long flags)
+{
+	if (!raw_irqs_disabled_flags(flags))
+		raw_local_irq_enable();
+}
+
 #endif
-- 
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