1/* MN10300 IRQ flag handling 2 * 3 * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public Licence 8 * as published by the Free Software Foundation; either version 9 * 2 of the Licence, or (at your option) any later version. 10 */ 11 12#ifndef _ASM_IRQFLAGS_H 13#define _ASM_IRQFLAGS_H 14 15#include <asm/cpu-regs.h> 16/* linux/smp.h <- linux/irqflags.h needs asm/smp.h first */ 17#include <asm/smp.h> 18 19/* 20 * interrupt control 21 * - "disabled": run in IM1/2 22 * - level 0 - kernel debugger 23 * - level 1 - virtual serial DMA (if present) 24 * - level 5 - normal interrupt priority 25 * - level 6 - timer interrupt 26 * - "enabled": run in IM7 27 */ 28#define MN10300_CLI_LEVEL (CONFIG_LINUX_CLI_LEVEL << EPSW_IM_SHIFT) 29 30#ifndef __ASSEMBLY__ 31 32static inline unsigned long arch_local_save_flags(void) 33{ 34 unsigned long flags; 35 36 asm volatile("mov epsw,%0" : "=d"(flags)); 37 return flags; 38} 39 40static inline void arch_local_irq_disable(void) 41{ 42 asm volatile( 43 " and %0,epsw \n" 44 " or %1,epsw \n" 45 " nop \n" 46 " nop \n" 47 " nop \n" 48 : 49 : "i"(~EPSW_IM), "i"(EPSW_IE | MN10300_CLI_LEVEL) 50 : "memory"); 51} 52 53static inline unsigned long arch_local_irq_save(void) 54{ 55 unsigned long flags; 56 57 flags = arch_local_save_flags(); 58 arch_local_irq_disable(); 59 return flags; 60} 61 62/* 63 * we make sure arch_irq_enable() doesn't cause priority inversion 64 */ 65extern unsigned long __mn10300_irq_enabled_epsw[]; 66 67static inline void arch_local_irq_enable(void) 68{ 69 unsigned long tmp; 70 int cpu = raw_smp_processor_id(); 71 72 asm volatile( 73 " mov epsw,%0 \n" 74 " and %1,%0 \n" 75 " or %2,%0 \n" 76 " mov %0,epsw \n" 77 : "=&d"(tmp) 78 : "i"(~EPSW_IM), "r"(__mn10300_irq_enabled_epsw[cpu]) 79 : "memory", "cc"); 80} 81 82static inline void arch_local_irq_restore(unsigned long flags) 83{ 84 asm volatile( 85 " mov %0,epsw \n" 86 " nop \n" 87 " nop \n" 88 " nop \n" 89 : 90 : "d"(flags) 91 : "memory", "cc"); 92} 93 94static inline bool arch_irqs_disabled_flags(unsigned long flags) 95{ 96 return (flags & (EPSW_IE | EPSW_IM)) != (EPSW_IE | EPSW_IM_7); 97} 98 99static inline bool arch_irqs_disabled(void) 100{ 101 return arch_irqs_disabled_flags(arch_local_save_flags()); 102} 103 104/* 105 * Hook to save power by halting the CPU 106 * - called from the idle loop 107 * - must reenable interrupts (which takes three instruction cycles to complete) 108 */ 109static inline void arch_safe_halt(void) 110{ 111#ifdef CONFIG_SMP 112 arch_local_irq_enable(); 113#else 114 asm volatile( 115 " or %0,epsw \n" 116 " nop \n" 117 " nop \n" 118 " bset %2,(%1) \n" 119 : 120 : "i"(EPSW_IE|EPSW_IM), "n"(&CPUM), "i"(CPUM_SLEEP) 121 : "cc"); 122#endif 123} 124 125#define __sleep_cpu() \ 126do { \ 127 asm volatile( \ 128 " bset %1,(%0)\n" \ 129 "1: btst %1,(%0)\n" \ 130 " bne 1b\n" \ 131 : \ 132 : "i"(&CPUM), "i"(CPUM_SLEEP) \ 133 : "cc" \ 134 ); \ 135} while (0) 136 137static inline void arch_local_cli(void) 138{ 139 asm volatile( 140 " and %0,epsw \n" 141 " nop \n" 142 " nop \n" 143 " nop \n" 144 : 145 : "i"(~EPSW_IE) 146 : "memory" 147 ); 148} 149 150static inline unsigned long arch_local_cli_save(void) 151{ 152 unsigned long flags = arch_local_save_flags(); 153 arch_local_cli(); 154 return flags; 155} 156 157static inline void arch_local_sti(void) 158{ 159 asm volatile( 160 " or %0,epsw \n" 161 : 162 : "i"(EPSW_IE) 163 : "memory"); 164} 165 166static inline void arch_local_change_intr_mask_level(unsigned long level) 167{ 168 asm volatile( 169 " and %0,epsw \n" 170 " or %1,epsw \n" 171 : 172 : "i"(~EPSW_IM), "i"(EPSW_IE | level) 173 : "cc", "memory"); 174} 175 176#else /* !__ASSEMBLY__ */ 177 178#define LOCAL_SAVE_FLAGS(reg) \ 179 mov epsw,reg 180 181#define LOCAL_IRQ_DISABLE \ 182 and ~EPSW_IM,epsw; \ 183 or EPSW_IE|MN10300_CLI_LEVEL,epsw; \ 184 nop; \ 185 nop; \ 186 nop 187 188#define LOCAL_IRQ_ENABLE \ 189 or EPSW_IE|EPSW_IM_7,epsw 190 191#define LOCAL_IRQ_RESTORE(reg) \ 192 mov reg,epsw 193 194#define LOCAL_CLI_SAVE(reg) \ 195 mov epsw,reg; \ 196 and ~EPSW_IE,epsw; \ 197 nop; \ 198 nop; \ 199 nop 200 201#define LOCAL_CLI \ 202 and ~EPSW_IE,epsw; \ 203 nop; \ 204 nop; \ 205 nop 206 207#define LOCAL_STI \ 208 or EPSW_IE,epsw 209 210#define LOCAL_CHANGE_INTR_MASK_LEVEL(level) \ 211 and ~EPSW_IM,epsw; \ 212 or EPSW_IE|(level),epsw 213 214#endif /* __ASSEMBLY__ */ 215#endif /* _ASM_IRQFLAGS_H */ 216