1/*
 2 * Xtensa IRQ flags handling functions
 3 *
 4 * This file is subject to the terms and conditions of the GNU General Public
 5 * License.  See the file "COPYING" in the main directory of this archive
 6 * for more details.
 7 *
 8 * Copyright (C) 2001 - 2005 Tensilica Inc.
 9 * Copyright (C) 2015 Cadence Design Systems Inc.
10 */
11
12#ifndef _XTENSA_IRQFLAGS_H
13#define _XTENSA_IRQFLAGS_H
14
15#include <linux/stringify.h>
16#include <linux/types.h>
17#include <asm/processor.h>
18
19static inline unsigned long arch_local_save_flags(void)
20{
21	unsigned long flags;
22	asm volatile("rsr %0, ps" : "=a" (flags));
23	return flags;
24}
25
26static inline unsigned long arch_local_irq_save(void)
27{
28	unsigned long flags;
29#if XTENSA_FAKE_NMI
30#if defined(CONFIG_DEBUG_MISC) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL
31	unsigned long tmp;
32
33	asm volatile("rsr	%0, ps\t\n"
34		     "extui	%1, %0, 0, 4\t\n"
35		     "bgei	%1, "__stringify(LOCKLEVEL)", 1f\t\n"
36		     "rsil	%0, "__stringify(LOCKLEVEL)"\n"
37		     "1:"
38		     : "=a" (flags), "=a" (tmp) :: "memory");
39#else
40	asm volatile("rsr	%0, ps\t\n"
41		     "or	%0, %0, %1\t\n"
42		     "xsr	%0, ps\t\n"
43		     "rsync"
44		     : "=&a" (flags) : "a" (LOCKLEVEL) : "memory");
45#endif
46#else
47	asm volatile("rsil	%0, "__stringify(LOCKLEVEL)
48		     : "=a" (flags) :: "memory");
49#endif
50	return flags;
51}
52
53static inline void arch_local_irq_disable(void)
54{
55	arch_local_irq_save();
56}
57
58static inline void arch_local_irq_enable(void)
59{
60	unsigned long flags;
61	asm volatile("rsil %0, 0" : "=a" (flags) :: "memory");
62}
63
64static inline void arch_local_irq_restore(unsigned long flags)
65{
66	asm volatile("wsr %0, ps; rsync"
67		     :: "a" (flags) : "memory");
68}
69
70static inline bool arch_irqs_disabled_flags(unsigned long flags)
71{
72#if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL
73#error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL"
74#endif
75	return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL;
76}
77
78static inline bool arch_irqs_disabled(void)
79{
80	return arch_irqs_disabled_flags(arch_local_save_flags());
81}
82
83#endif /* _XTENSA_IRQFLAGS_H */