xref: /OK3568_Linux_fs/kernel/arch/c6x/include/asm/irqflags.h (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  *  C6X IRQ flag handling
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  * Copyright (C) 2010 Texas Instruments Incorporated
6*4882a593Smuzhiyun  * Written by Mark Salter (msalter@redhat.com)
7*4882a593Smuzhiyun  */
8*4882a593Smuzhiyun 
9*4882a593Smuzhiyun #ifndef _ASM_IRQFLAGS_H
10*4882a593Smuzhiyun #define _ASM_IRQFLAGS_H
11*4882a593Smuzhiyun 
12*4882a593Smuzhiyun #ifndef __ASSEMBLY__
13*4882a593Smuzhiyun 
14*4882a593Smuzhiyun /* read interrupt enabled status */
arch_local_save_flags(void)15*4882a593Smuzhiyun static inline unsigned long arch_local_save_flags(void)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun 	unsigned long flags;
18*4882a593Smuzhiyun 
19*4882a593Smuzhiyun 	asm volatile (" mvc .s2 CSR,%0\n" : "=b"(flags));
20*4882a593Smuzhiyun 	return flags;
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun 
23*4882a593Smuzhiyun /* set interrupt enabled status */
arch_local_irq_restore(unsigned long flags)24*4882a593Smuzhiyun static inline void arch_local_irq_restore(unsigned long flags)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun 	asm volatile (" mvc .s2 %0,CSR\n" : : "b"(flags) : "memory");
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun 
29*4882a593Smuzhiyun /* unconditionally enable interrupts */
arch_local_irq_enable(void)30*4882a593Smuzhiyun static inline void arch_local_irq_enable(void)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun 	unsigned long flags = arch_local_save_flags();
33*4882a593Smuzhiyun 	flags |= 1;
34*4882a593Smuzhiyun 	arch_local_irq_restore(flags);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun 
37*4882a593Smuzhiyun /* unconditionally disable interrupts */
arch_local_irq_disable(void)38*4882a593Smuzhiyun static inline void arch_local_irq_disable(void)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun 	unsigned long flags = arch_local_save_flags();
41*4882a593Smuzhiyun 	flags &= ~1;
42*4882a593Smuzhiyun 	arch_local_irq_restore(flags);
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun 
45*4882a593Smuzhiyun /* get status and disable interrupts */
arch_local_irq_save(void)46*4882a593Smuzhiyun static inline unsigned long arch_local_irq_save(void)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun 	unsigned long flags;
49*4882a593Smuzhiyun 
50*4882a593Smuzhiyun 	flags = arch_local_save_flags();
51*4882a593Smuzhiyun 	arch_local_irq_restore(flags & ~1);
52*4882a593Smuzhiyun 	return flags;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun 
55*4882a593Smuzhiyun /* test flags */
arch_irqs_disabled_flags(unsigned long flags)56*4882a593Smuzhiyun static inline int arch_irqs_disabled_flags(unsigned long flags)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun 	return (flags & 1) == 0;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun 
61*4882a593Smuzhiyun /* test hardware interrupt enable bit */
arch_irqs_disabled(void)62*4882a593Smuzhiyun static inline int arch_irqs_disabled(void)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun 	return arch_irqs_disabled_flags(arch_local_save_flags());
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun 
67*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */
68*4882a593Smuzhiyun #endif /* __ASM_IRQFLAGS_H */
69