1 /* 2 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #ifndef __ASM_IRQFLAGS_ARCV2_H 10 #define __ASM_IRQFLAGS_ARCV2_H 11 12 #include <asm/arcregs.h> 13 14 /* status32 Bits */ 15 #define STATUS_AD_BIT 19 /* Disable Align chk: core supports non-aligned */ 16 #define STATUS_IE_BIT 31 17 18 #define STATUS_AD_MASK (1<<STATUS_AD_BIT) 19 #define STATUS_IE_MASK (1<<STATUS_IE_BIT) 20 21 #define AUX_USER_SP 0x00D 22 #define AUX_IRQ_CTRL 0x00E 23 #define AUX_IRQ_ACT 0x043 /* Active Intr across all levels */ 24 #define AUX_IRQ_LVL_PEND 0x200 /* Pending Intr across all levels */ 25 #define AUX_IRQ_PRIORITY 0x206 26 #define ICAUSE 0x40a 27 #define AUX_IRQ_SELECT 0x40b 28 #define AUX_IRQ_ENABLE 0x40c 29 30 /* Was Intr taken in User Mode */ 31 #define AUX_IRQ_ACT_BIT_U 31 32 33 /* 34 * User space should be interruptable even by lowest prio interrupt 35 * Safe even if actual interrupt priorities is fewer or even one 36 */ 37 #define ARCV2_IRQ_DEF_PRIO 15 38 39 /* seed value for status register */ 40 #define ISA_INIT_STATUS_BITS (STATUS_IE_MASK | STATUS_AD_MASK | \ 41 (ARCV2_IRQ_DEF_PRIO << 1)) 42 43 /* SLEEP needs default irq priority (<=) which can interrupt the doze */ 44 #define ISA_SLEEP_ARG (0x10 | ARCV2_IRQ_DEF_PRIO) 45 46 #ifndef __ASSEMBLY__ 47 48 /* 49 * Save IRQ state and disable IRQs 50 */ 51 static inline long arch_local_irq_save(void) 52 { 53 unsigned long flags; 54 55 __asm__ __volatile__(" clri %0 \n" : "=r" (flags) : : "memory"); 56 57 return flags; 58 } 59 60 /* 61 * restore saved IRQ state 62 */ 63 static inline void arch_local_irq_restore(unsigned long flags) 64 { 65 __asm__ __volatile__(" seti %0 \n" : : "r" (flags) : "memory"); 66 } 67 68 /* 69 * Unconditionally Enable IRQs 70 */ 71 static inline void arch_local_irq_enable(void) 72 { 73 unsigned int irqact = read_aux_reg(AUX_IRQ_ACT); 74 75 if (irqact & 0xffff) 76 write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff); 77 78 __asm__ __volatile__(" seti \n" : : : "memory"); 79 } 80 81 /* 82 * Unconditionally Disable IRQs 83 */ 84 static inline void arch_local_irq_disable(void) 85 { 86 __asm__ __volatile__(" clri \n" : : : "memory"); 87 } 88 89 /* 90 * save IRQ state 91 */ 92 static inline long arch_local_save_flags(void) 93 { 94 unsigned long temp; 95 96 __asm__ __volatile__( 97 " lr %0, [status32] \n" 98 : "=&r"(temp) 99 : 100 : "memory"); 101 102 return temp; 103 } 104 105 /* 106 * Query IRQ state 107 */ 108 static inline int arch_irqs_disabled_flags(unsigned long flags) 109 { 110 return !(flags & (STATUS_IE_MASK)); 111 } 112 113 static inline int arch_irqs_disabled(void) 114 { 115 return arch_irqs_disabled_flags(arch_local_save_flags()); 116 } 117 118 #else 119 120 .macro IRQ_DISABLE scratch 121 clri 122 .endm 123 124 .macro IRQ_ENABLE scratch 125 seti 126 .endm 127 128 #endif /* __ASSEMBLY__ */ 129 130 #endif 131