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_system_reset(void); 36 extern void __replay_interrupt(unsigned int vector); 37 38 extern void timer_interrupt(struct pt_regs *); 39 extern void performance_monitor_exception(struct pt_regs *regs); 40 extern void WatchdogException(struct pt_regs *regs); 41 extern void unknown_exception(struct pt_regs *regs); 42 43 #ifdef CONFIG_PPC64 44 #include <asm/paca.h> 45 46 static inline unsigned long arch_local_save_flags(void) 47 { 48 unsigned long flags; 49 50 asm volatile( 51 "lbz %0,%1(13)" 52 : "=r" (flags) 53 : "i" (offsetof(struct paca_struct, soft_enabled))); 54 55 return flags; 56 } 57 58 static inline unsigned long arch_local_irq_disable(void) 59 { 60 unsigned long flags, zero; 61 62 asm volatile( 63 "li %1,0; lbz %0,%2(13); stb %1,%2(13)" 64 : "=r" (flags), "=&r" (zero) 65 : "i" (offsetof(struct paca_struct, soft_enabled)) 66 : "memory"); 67 68 return flags; 69 } 70 71 extern void arch_local_irq_restore(unsigned long); 72 73 static inline void arch_local_irq_enable(void) 74 { 75 arch_local_irq_restore(1); 76 } 77 78 static inline unsigned long arch_local_irq_save(void) 79 { 80 return arch_local_irq_disable(); 81 } 82 83 static inline bool arch_irqs_disabled_flags(unsigned long flags) 84 { 85 return flags == 0; 86 } 87 88 static inline bool arch_irqs_disabled(void) 89 { 90 return arch_irqs_disabled_flags(arch_local_save_flags()); 91 } 92 93 #ifdef CONFIG_PPC_BOOK3E 94 #define __hard_irq_enable() asm volatile("wrteei 1" : : : "memory") 95 #define __hard_irq_disable() asm volatile("wrteei 0" : : : "memory") 96 #else 97 #define __hard_irq_enable() __mtmsrd(local_paca->kernel_msr | MSR_EE, 1) 98 #define __hard_irq_disable() __mtmsrd(local_paca->kernel_msr, 1) 99 #endif 100 101 #define hard_irq_disable() do { \ 102 u8 _was_enabled; \ 103 __hard_irq_disable(); \ 104 _was_enabled = local_paca->soft_enabled; \ 105 local_paca->soft_enabled = 0; \ 106 local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \ 107 if (_was_enabled) \ 108 trace_hardirqs_off(); \ 109 } while(0) 110 111 static inline bool lazy_irq_pending(void) 112 { 113 return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS); 114 } 115 116 /* 117 * This is called by asynchronous interrupts to conditionally 118 * re-enable hard interrupts when soft-disabled after having 119 * cleared the source of the interrupt 120 */ 121 static inline void may_hard_irq_enable(void) 122 { 123 get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS; 124 if (!(get_paca()->irq_happened & PACA_IRQ_EE)) 125 __hard_irq_enable(); 126 } 127 128 static inline bool arch_irq_disabled_regs(struct pt_regs *regs) 129 { 130 return !regs->softe; 131 } 132 133 extern bool prep_irq_for_idle(void); 134 extern bool prep_irq_for_idle_irqsoff(void); 135 extern void irq_set_pending_from_srr1(unsigned long srr1); 136 137 #define fini_irq_for_idle_irqsoff() trace_hardirqs_off(); 138 139 extern void force_external_irq_replay(void); 140 141 #else /* CONFIG_PPC64 */ 142 143 #define SET_MSR_EE(x) mtmsr(x) 144 145 static inline unsigned long arch_local_save_flags(void) 146 { 147 return mfmsr(); 148 } 149 150 static inline void arch_local_irq_restore(unsigned long flags) 151 { 152 #if defined(CONFIG_BOOKE) 153 asm volatile("wrtee %0" : : "r" (flags) : "memory"); 154 #else 155 mtmsr(flags); 156 #endif 157 } 158 159 static inline unsigned long arch_local_irq_save(void) 160 { 161 unsigned long flags = arch_local_save_flags(); 162 #ifdef CONFIG_BOOKE 163 asm volatile("wrteei 0" : : : "memory"); 164 #elif defined(CONFIG_PPC_8xx) 165 wrtspr(SPRN_EID); 166 #else 167 SET_MSR_EE(flags & ~MSR_EE); 168 #endif 169 return flags; 170 } 171 172 static inline void arch_local_irq_disable(void) 173 { 174 #ifdef CONFIG_BOOKE 175 asm volatile("wrteei 0" : : : "memory"); 176 #elif defined(CONFIG_PPC_8xx) 177 wrtspr(SPRN_EID); 178 #else 179 arch_local_irq_save(); 180 #endif 181 } 182 183 static inline void arch_local_irq_enable(void) 184 { 185 #ifdef CONFIG_BOOKE 186 asm volatile("wrteei 1" : : : "memory"); 187 #elif defined(CONFIG_PPC_8xx) 188 wrtspr(SPRN_EIE); 189 #else 190 unsigned long msr = mfmsr(); 191 SET_MSR_EE(msr | MSR_EE); 192 #endif 193 } 194 195 static inline bool arch_irqs_disabled_flags(unsigned long flags) 196 { 197 return (flags & MSR_EE) == 0; 198 } 199 200 static inline bool arch_irqs_disabled(void) 201 { 202 return arch_irqs_disabled_flags(arch_local_save_flags()); 203 } 204 205 #define hard_irq_disable() arch_local_irq_disable() 206 207 static inline bool arch_irq_disabled_regs(struct pt_regs *regs) 208 { 209 return !(regs->msr & MSR_EE); 210 } 211 212 static inline void may_hard_irq_enable(void) { } 213 214 #endif /* CONFIG_PPC64 */ 215 216 #define ARCH_IRQ_INIT_FLAGS IRQ_NOREQUEST 217 218 /* 219 * interrupt-retrigger: should we handle this via lost interrupts and IPIs 220 * or should we not care like we do now ? --BenH. 221 */ 222 struct irq_chip; 223 224 #endif /* __ASSEMBLY__ */ 225 #endif /* __KERNEL__ */ 226 #endif /* _ASM_POWERPC_HW_IRQ_H */ 227