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Subject[PATCH 12/25] Blackfin: convert interrupt pipeline to irqflags
Date
From: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
arch/blackfin/include/asm/ipipe_base.h | 30 +++---
arch/blackfin/include/asm/irq.h | 7 --
arch/blackfin/include/asm/irqflags.h | 164 ++++++++++++++++++++++++++++++-
arch/blackfin/include/asm/system.h | 4 +-
arch/blackfin/kernel/ipipe.c | 2 +-
5 files changed, 177 insertions(+), 30 deletions(-)

diff --git a/arch/blackfin/include/asm/ipipe_base.h b/arch/blackfin/include/asm/ipipe_base.h
index 3e8acbd..490098f 100644
--- a/arch/blackfin/include/asm/ipipe_base.h
+++ b/arch/blackfin/include/asm/ipipe_base.h
@@ -51,23 +51,23 @@

extern unsigned long __ipipe_root_status; /* Alias to ipipe_root_cpudom_var(status) */

-static inline void __ipipe_stall_root(void)
-{
- volatile unsigned long *p = &__ipipe_root_status;
- set_bit(0, p);
-}
+#define __ipipe_stall_root() \
+ do { \
+ volatile unsigned long *p = &__ipipe_root_status; \
+ set_bit(0, p); \
+ } while (0)

-static inline unsigned long __ipipe_test_and_stall_root(void)
-{
- volatile unsigned long *p = &__ipipe_root_status;
- return test_and_set_bit(0, p);
-}
+#define __ipipe_test_and_stall_root() \
+ ({ \
+ volatile unsigned long *p = &__ipipe_root_status; \
+ test_and_set_bit(0, p); \
+ })

-static inline unsigned long __ipipe_test_root(void)
-{
- const unsigned long *p = &__ipipe_root_status;
- return test_bit(0, p);
-}
+#define __ipipe_test_root() \
+ ({ \
+ const unsigned long *p = &__ipipe_root_status; \
+ test_bit(0, p); \
+ })

#endif /* !__ASSEMBLY__ */

diff --git a/arch/blackfin/include/asm/irq.h b/arch/blackfin/include/asm/irq.h
index 9a7f63a..42a15f5 100644
--- a/arch/blackfin/include/asm/irq.h
+++ b/arch/blackfin/include/asm/irq.h
@@ -22,13 +22,6 @@
/* SYS_IRQS and NR_IRQS are defined in <mach-bf5xx/irq.h> */
#include <mach/irq.h>

-/* Xenomai IPIPE helpers */
-#define local_irq_restore_hw(x) local_irq_restore(x)
-#define local_irq_save_hw(x) local_irq_save(x)
-#define local_irq_enable_hw(x) local_irq_enable(x)
-#define local_irq_disable_hw(x) local_irq_disable(x)
-#define irqs_disabled_hw(x) irqs_disabled(x)
-
#if ANOMALY_05000244 && defined(CONFIG_BFIN_ICACHE)
# define NOP_PAD_ANOMALY_05000244 "nop; nop;"
#else
diff --git a/arch/blackfin/include/asm/irqflags.h b/arch/blackfin/include/asm/irqflags.h
index 139cba4..9b19a19 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
diff --git a/arch/blackfin/include/asm/system.h b/arch/blackfin/include/asm/system.h
index 294dbda..85e8f16 100644
--- a/arch/blackfin/include/asm/system.h
+++ b/arch/blackfin/include/asm/system.h
@@ -135,11 +135,13 @@ struct __xchg_dummy {
};
#define __xg(x) ((volatile struct __xchg_dummy *)(x))

+#include <mach/blackfin.h>
+
static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
int size)
{
unsigned long tmp = 0;
- unsigned long flags = 0;
+ unsigned long flags;

local_irq_save_hw(flags);

diff --git a/arch/blackfin/kernel/ipipe.c b/arch/blackfin/kernel/ipipe.c
index d8cde1f..2b979ed 100644
--- a/arch/blackfin/kernel/ipipe.c
+++ b/arch/blackfin/kernel/ipipe.c
@@ -52,7 +52,7 @@ EXPORT_SYMBOL(__ipipe_freq_scale);

atomic_t __ipipe_irq_lvdepth[IVG15 + 1];

-unsigned long __ipipe_irq_lvmask = __all_masked_irq_flags;
+unsigned long __ipipe_irq_lvmask = bfin_no_irqs;
EXPORT_SYMBOL(__ipipe_irq_lvmask);

static void __ipipe_ack_irq(unsigned irq, struct irq_desc *desc)
--
1.6.3.1


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