diff options
Diffstat (limited to 'arch/blackfin/include/asm/system.h')
| -rw-r--r-- | arch/blackfin/include/asm/system.h | 116 |
1 files changed, 95 insertions, 21 deletions
diff --git a/arch/blackfin/include/asm/system.h b/arch/blackfin/include/asm/system.h index 8f1627d8bf0..6b368faf30c 100644 --- a/arch/blackfin/include/asm/system.h +++ b/arch/blackfin/include/asm/system.h @@ -37,20 +37,16 @@ #include <linux/linkage.h> #include <linux/compiler.h> #include <mach/anomaly.h> +#include <asm/pda.h> +#include <asm/processor.h> + +/* Forward decl needed due to cdef inter dependencies */ +static inline uint32_t __pure bfin_dspid(void); +#define blackfin_core_id() (bfin_dspid() & 0xff) /* * Interrupt configuring macros. */ - -extern unsigned long irq_flags; - -#define local_irq_enable() \ - __asm__ __volatile__( \ - "sti %0;" \ - : \ - : "d" (irq_flags) \ - ) - #define local_irq_disable() \ do { \ int __tmp_dummy; \ @@ -66,6 +62,18 @@ extern unsigned long irq_flags; # define NOP_PAD_ANOMALY_05000244 #endif +#ifdef CONFIG_SMP +# define irq_flags cpu_pda[blackfin_core_id()].imask +#else +extern unsigned long irq_flags; +#endif + +#define local_irq_enable() \ + __asm__ __volatile__( \ + "sti %0;" \ + : \ + : "d" (irq_flags) \ + ) #define idle_with_irq_disabled() \ __asm__ __volatile__( \ NOP_PAD_ANOMALY_05000244 \ @@ -129,22 +137,85 @@ extern unsigned long irq_flags; #define rmb() asm volatile ("" : : :"memory") #define wmb() asm volatile ("" : : :"memory") #define set_mb(var, value) do { (void) xchg(&var, value); } while (0) - #define read_barrier_depends() do { } while(0) #ifdef CONFIG_SMP -#define smp_mb() mb() -#define smp_rmb() rmb() -#define smp_wmb() wmb() -#define smp_read_barrier_depends() read_barrier_depends() +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); + +#ifdef __ARCH_SYNC_CORE_DCACHE +# define smp_mb() do { barrier(); smp_check_barrier(); smp_mark_barrier(); } while (0) +# define smp_rmb() do { barrier(); smp_check_barrier(); } while (0) +# define smp_wmb() do { barrier(); smp_mark_barrier(); } while (0) #else +# define smp_mb() barrier() +# define smp_rmb() barrier() +# define smp_wmb() barrier() +#endif + +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)))) + +#define smp_read_barrier_depends() smp_check_barrier() + +#else /* !CONFIG_SMP */ + #define smp_mb() barrier() #define smp_rmb() barrier() #define smp_wmb() barrier() #define smp_read_barrier_depends() do { } while(0) -#endif - -#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) struct __xchg_dummy { unsigned long a[100]; @@ -194,9 +265,12 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, (unsigned long)(n), sizeof(*(ptr)))) #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) -#ifndef CONFIG_SMP #include <asm-generic/cmpxchg.h> -#endif + +#endif /* !CONFIG_SMP */ + +#define xchg(ptr, x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))) +#define tas(ptr) ((void)xchg((ptr), 1)) #define prepare_to_switch() do { } while(0) @@ -218,4 +292,4 @@ do { \ (last) = resume (prev, next); \ } while (0) -#endif /* _BLACKFIN_SYSTEM_H */ +#endif /* _BLACKFIN_SYSTEM_H */ |