Disintegrate asm/system.h for Blackfin [ver #2]

Disintegrate asm/system.h for Blackfin.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: uclinux-dist-devel@blackfin.uclinux.org
Signed-off-by: Bob Liu <lliubbo@gmail.com>

arch/blackfin/include/asm/atomic.h

@@ -7,6 +7,8 @@
 #ifndef __ARCH_BLACKFIN_ATOMIC__
 #define __ARCH_BLACKFIN_ATOMIC__
 
+#include <asm/cmpxchg.h>
+
 #ifdef CONFIG_SMP
 
 #include <linux/linkage.h>

arch/blackfin/include/asm/barrier.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2004-2009 Analog Devices Inc.
+ *               Tony Kou (tonyko@lineo.ca)
+ *
+ * Licensed under the GPL-2 or later
+ */
+
+#ifndef _BLACKFIN_BARRIER_H
+#define _BLACKFIN_BARRIER_H
+
+#include <asm/cache.h>
+
+#define nop()  __asm__ __volatile__ ("nop;\n\t" : : )
+
+/*
+ * Force strict CPU ordering.
+ */
+#ifdef CONFIG_SMP
+
+#ifdef __ARCH_SYNC_CORE_DCACHE
+/* Force Core data cache coherence */
+# define mb()	do { barrier(); smp_check_barrier(); smp_mark_barrier(); } while (0)
+# define rmb()	do { barrier(); smp_check_barrier(); } while (0)
+# define wmb()	do { barrier(); smp_mark_barrier(); } while (0)
+# define read_barrier_depends()	do { barrier(); smp_check_barrier(); } while (0)
+#else
+# define mb()	barrier()
+# define rmb()	barrier()
+# define wmb()	barrier()
+# define read_barrier_depends()	do { } while (0)
+#endif
+
+#else /* !CONFIG_SMP */
+
+#define mb()	barrier()
+#define rmb()	barrier()
+#define wmb()	barrier()
+#define read_barrier_depends()	do { } while (0)
+
+#endif /* !CONFIG_SMP */
+
+#define smp_mb()  mb()
+#define smp_rmb() rmb()
+#define smp_wmb() wmb()
+#define set_mb(var, value) do { var = value; mb(); } while (0)
+#define smp_read_barrier_depends()	read_barrier_depends()
+
+#endif /* _BLACKFIN_BARRIER_H */

arch/blackfin/include/asm/cmpxchg.h

@@ -0,0 +1,132 @@
+/*
+ * Copyright 2004-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __ARCH_BLACKFIN_CMPXCHG__
+#define __ARCH_BLACKFIN_CMPXCHG__
+
+#ifdef CONFIG_SMP
+
+#include <linux/linkage.h>
+
+asmlinkage unsigned long __raw_xchg_1_asm(volatile void *ptr, unsigned long value);
+asmlinkage unsigned long __raw_xchg_2_asm(volatile void *ptr, unsigned long value);
+asmlinkage unsigned long __raw_xchg_4_asm(volatile void *ptr, unsigned long value);
+asmlinkage unsigned long __raw_cmpxchg_1_asm(volatile void *ptr,
+					unsigned long new, unsigned long old);
+asmlinkage unsigned long __raw_cmpxchg_2_asm(volatile void *ptr,
+					unsigned long new, unsigned long old);
+asmlinkage unsigned long __raw_cmpxchg_4_asm(volatile void *ptr,
+					unsigned long new, unsigned long old);
+
+static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
+				   int size)
+{
+	unsigned long tmp;
+
+	switch (size) {
+	case 1:
+		tmp = __raw_xchg_1_asm(ptr, x);
+		break;
+	case 2:
+		tmp = __raw_xchg_2_asm(ptr, x);
+		break;
+	case 4:
+		tmp = __raw_xchg_4_asm(ptr, x);
+		break;
+	}
+
+	return tmp;
+}
+
+/*
+ * Atomic compare and exchange.  Compare OLD with MEM, if identical,
+ * store NEW in MEM.  Return the initial value in MEM.  Success is
+ * indicated by comparing RETURN with OLD.
+ */
+static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
+				      unsigned long new, int size)
+{
+	unsigned long tmp;
+
+	switch (size) {
+	case 1:
+		tmp = __raw_cmpxchg_1_asm(ptr, new, old);
+		break;
+	case 2:
+		tmp = __raw_cmpxchg_2_asm(ptr, new, old);
+		break;
+	case 4:
+		tmp = __raw_cmpxchg_4_asm(ptr, new, old);
+		break;
+	}
+
+	return tmp;
+}
+#define cmpxchg(ptr, o, n) \
+	((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
+		(unsigned long)(n), sizeof(*(ptr))))
+
+#else /* !CONFIG_SMP */
+
+#include <mach/blackfin.h>
+#include <asm/irqflags.h>
+
+struct __xchg_dummy {
+	unsigned long a[100];
+};
+#define __xg(x) ((volatile struct __xchg_dummy *)(x))
+
+static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
+				   int size)
+{
+	unsigned long tmp = 0;
+	unsigned long flags;
+
+	flags = hard_local_irq_save();
+
+	switch (size) {
+	case 1:
+		__asm__ __volatile__
+			("%0 = b%2 (z);\n\t"
+			 "b%2 = %1;\n\t"
+			 : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+		break;
+	case 2:
+		__asm__ __volatile__
+			("%0 = w%2 (z);\n\t"
+			 "w%2 = %1;\n\t"
+			 : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+		break;
+	case 4:
+		__asm__ __volatile__
+			("%0 = %2;\n\t"
+			 "%2 = %1;\n\t"
+			 : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+		break;
+	}
+	hard_local_irq_restore(flags);
+	return tmp;
+}
+
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)				  	       \
+	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
+			(unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
+#include <asm-generic/cmpxchg.h>
+
+#endif /* !CONFIG_SMP */
+
+#define xchg(ptr, x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
+#define tas(ptr) ((void)xchg((ptr), 1))
+
+#endif /* __ARCH_BLACKFIN_CMPXCHG__ */

arch/blackfin/include/asm/exec.h

@@ -0,0 +1 @@
+/* define arch_align_stack() here */

arch/blackfin/include/asm/irq_handler.h

@@ -9,6 +9,7 @@
 
 #include <linux/types.h>
 #include <linux/linkage.h>
+#include <mach/irq.h>
 
 /* init functions only */
 extern int __init init_arch_irq(void);

arch/blackfin/include/asm/switch_to.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2004-2009 Analog Devices Inc.
+ *               Tony Kou (tonyko@lineo.ca)
+ *
+ * Licensed under the GPL-2 or later
+ */
+
+#ifndef _BLACKFIN_SWITCH_TO_H
+#define _BLACKFIN_SWITCH_TO_H
+
+#define prepare_to_switch()     do { } while(0)
+
+/*
+ * switch_to(n) should switch tasks to task ptr, first checking that
+ * ptr isn't the current task, in which case it does nothing.
+ */
+
+#include <asm/l1layout.h>
+#include <asm/mem_map.h>
+
+asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next);
+
+#ifndef CONFIG_SMP
+#define switch_to(prev,next,last) \
+do {    \
+	memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \
+		sizeof *L1_SCRATCH_TASK_INFO); \
+	memcpy (L1_SCRATCH_TASK_INFO, &task_thread_info(next)->l1_task_info, \
+		sizeof *L1_SCRATCH_TASK_INFO); \
+	(last) = resume (prev, next);   \
+} while (0)
+#else
+#define switch_to(prev, next, last) \
+do {    \
+	(last) = resume(prev, next);   \
+} while (0)
+#endif
+
+#endif /* _BLACKFIN_SWITCH_TO_H */