1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
4 */
5 #ifndef _ASM_POWERPC_HW_IRQ_H
6 #define _ASM_POWERPC_HW_IRQ_H
7
8 #ifdef __KERNEL__
9
10 #include <linux/errno.h>
11 #include <linux/compiler.h>
12 #include <asm/ptrace.h>
13 #include <asm/processor.h>
14
15 #ifdef CONFIG_PPC64
16
17 /*
18 * PACA flags in paca->irq_happened.
19 *
20 * This bits are set when interrupts occur while soft-disabled
21 * and allow a proper replay. Additionally, PACA_IRQ_HARD_DIS
22 * is set whenever we manually hard disable.
23 */
24 #define PACA_IRQ_HARD_DIS 0x01
25 #define PACA_IRQ_DBELL 0x02
26 #define PACA_IRQ_EE 0x04
27 #define PACA_IRQ_DEC 0x08 /* Or FIT */
28 #define PACA_IRQ_EE_EDGE 0x10 /* BookE only */
29 #define PACA_IRQ_HMI 0x20
30
31 #endif /* CONFIG_PPC64 */
32
33 #ifndef __ASSEMBLY__
34
35 extern void __replay_interrupt(unsigned int vector);
36
37 extern void timer_interrupt(struct pt_regs *);
38 extern void performance_monitor_exception(struct pt_regs *regs);
39 extern void WatchdogException(struct pt_regs *regs);
40 extern void unknown_exception(struct pt_regs *regs);
41
42 #ifdef CONFIG_PPC64
43 #include <asm/paca.h>
44
arch_local_save_flags(void)45 static inline unsigned long arch_local_save_flags(void)
46 {
47 unsigned long flags;
48
49 asm volatile(
50 "lbz %0,%1(13)"
51 : "=r" (flags)
52 : "i" (offsetof(struct paca_struct, soft_enabled)));
53
54 return flags;
55 }
56
arch_local_irq_disable(void)57 static inline unsigned long arch_local_irq_disable(void)
58 {
59 unsigned long flags, zero;
60
61 asm volatile(
62 "li %1,0; lbz %0,%2(13); stb %1,%2(13)"
63 : "=r" (flags), "=&r" (zero)
64 : "i" (offsetof(struct paca_struct, soft_enabled))
65 : "memory");
66
67 return flags;
68 }
69
70 extern void arch_local_irq_restore(unsigned long);
71
arch_local_irq_enable(void)72 static inline void arch_local_irq_enable(void)
73 {
74 arch_local_irq_restore(1);
75 }
76
arch_local_irq_save(void)77 static inline unsigned long arch_local_irq_save(void)
78 {
79 return arch_local_irq_disable();
80 }
81
arch_irqs_disabled_flags(unsigned long flags)82 static inline bool arch_irqs_disabled_flags(unsigned long flags)
83 {
84 return flags == 0;
85 }
86
arch_irqs_disabled(void)87 static inline bool arch_irqs_disabled(void)
88 {
89 return arch_irqs_disabled_flags(arch_local_save_flags());
90 }
91
92 #ifdef CONFIG_PPC_BOOK3E
93 #define __hard_irq_enable() asm volatile("wrteei 1" : : : "memory")
94 #define __hard_irq_disable() asm volatile("wrteei 0" : : : "memory")
95 #else
96 #define __hard_irq_enable() __mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
97 #define __hard_irq_disable() __mtmsrd(local_paca->kernel_msr, 1)
98 #endif
99
100 #define hard_irq_disable() do { \
101 u8 _was_enabled; \
102 __hard_irq_disable(); \
103 _was_enabled = local_paca->soft_enabled; \
104 local_paca->soft_enabled = 0; \
105 local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \
106 if (_was_enabled) \
107 trace_hardirqs_off(); \
108 } while(0)
109
lazy_irq_pending(void)110 static inline bool lazy_irq_pending(void)
111 {
112 return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
113 }
114
115 /*
116 * This is called by asynchronous interrupts to conditionally
117 * re-enable hard interrupts when soft-disabled after having
118 * cleared the source of the interrupt
119 */
may_hard_irq_enable(void)120 static inline void may_hard_irq_enable(void)
121 {
122 get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
123 if (!(get_paca()->irq_happened & PACA_IRQ_EE))
124 __hard_irq_enable();
125 }
126
arch_irq_disabled_regs(struct pt_regs * regs)127 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
128 {
129 return !regs->softe;
130 }
131
132 extern bool prep_irq_for_idle(void);
133 extern bool prep_irq_for_idle_irqsoff(void);
134 extern void irq_set_pending_from_srr1(unsigned long srr1);
135
136 #define fini_irq_for_idle_irqsoff() trace_hardirqs_off();
137
138 extern void force_external_irq_replay(void);
139
140 #else /* CONFIG_PPC64 */
141
142 #define SET_MSR_EE(x) mtmsr(x)
143
arch_local_save_flags(void)144 static inline unsigned long arch_local_save_flags(void)
145 {
146 return mfmsr();
147 }
148
arch_local_irq_restore(unsigned long flags)149 static inline void arch_local_irq_restore(unsigned long flags)
150 {
151 #if defined(CONFIG_BOOKE)
152 asm volatile("wrtee %0" : : "r" (flags) : "memory");
153 #else
154 mtmsr(flags);
155 #endif
156 }
157
arch_local_irq_save(void)158 static inline unsigned long arch_local_irq_save(void)
159 {
160 unsigned long flags = arch_local_save_flags();
161 #ifdef CONFIG_BOOKE
162 asm volatile("wrteei 0" : : : "memory");
163 #elif defined(CONFIG_PPC_8xx)
164 wrtspr(SPRN_EID);
165 #else
166 SET_MSR_EE(flags & ~MSR_EE);
167 #endif
168 return flags;
169 }
170
arch_local_irq_disable(void)171 static inline void arch_local_irq_disable(void)
172 {
173 #ifdef CONFIG_BOOKE
174 asm volatile("wrteei 0" : : : "memory");
175 #elif defined(CONFIG_PPC_8xx)
176 wrtspr(SPRN_EID);
177 #else
178 arch_local_irq_save();
179 #endif
180 }
181
arch_local_irq_enable(void)182 static inline void arch_local_irq_enable(void)
183 {
184 #ifdef CONFIG_BOOKE
185 asm volatile("wrteei 1" : : : "memory");
186 #elif defined(CONFIG_PPC_8xx)
187 wrtspr(SPRN_EIE);
188 #else
189 unsigned long msr = mfmsr();
190 SET_MSR_EE(msr | MSR_EE);
191 #endif
192 }
193
arch_irqs_disabled_flags(unsigned long flags)194 static inline bool arch_irqs_disabled_flags(unsigned long flags)
195 {
196 return (flags & MSR_EE) == 0;
197 }
198
arch_irqs_disabled(void)199 static inline bool arch_irqs_disabled(void)
200 {
201 return arch_irqs_disabled_flags(arch_local_save_flags());
202 }
203
204 #define hard_irq_disable() arch_local_irq_disable()
205
arch_irq_disabled_regs(struct pt_regs * regs)206 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
207 {
208 return !(regs->msr & MSR_EE);
209 }
210
may_hard_irq_enable(void)211 static inline void may_hard_irq_enable(void) { }
212
213 #endif /* CONFIG_PPC64 */
214
215 #define ARCH_IRQ_INIT_FLAGS IRQ_NOREQUEST
216
217 /*
218 * interrupt-retrigger: should we handle this via lost interrupts and IPIs
219 * or should we not care like we do now ? --BenH.
220 */
221 struct irq_chip;
222
223 #endif /* __ASSEMBLY__ */
224 #endif /* __KERNEL__ */
225 #endif /* _ASM_POWERPC_HW_IRQ_H */
226