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 /* 0 is highest level, but taken by FIRQs, if present in design */ 34 #define ARCV2_IRQ_DEF_PRIO 0 35 36 /* seed value for status register */ 37 #define ISA_INIT_STATUS_BITS (STATUS_IE_MASK | STATUS_AD_MASK | \ 38 (ARCV2_IRQ_DEF_PRIO << 1)) 39 40 #ifndef __ASSEMBLY__ 41 42 /* 43 * Save IRQ state and disable IRQs 44 */ 45 static inline long arch_local_irq_save(void) 46 { 47 unsigned long flags; 48 49 __asm__ __volatile__(" clri %0 \n" : "=r" (flags) : : "memory"); 50 51 return flags; 52 } 53 54 /* 55 * restore saved IRQ state 56 */ 57 static inline void arch_local_irq_restore(unsigned long flags) 58 { 59 __asm__ __volatile__(" seti %0 \n" : : "r" (flags) : "memory"); 60 } 61 62 /* 63 * Unconditionally Enable IRQs 64 */ 65 static inline void arch_local_irq_enable(void) 66 { 67 unsigned int irqact = read_aux_reg(AUX_IRQ_ACT); 68 69 if (irqact & 0xffff) 70 write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff); 71 72 __asm__ __volatile__(" seti \n" : : : "memory"); 73 } 74 75 /* 76 * Unconditionally Disable IRQs 77 */ 78 static inline void arch_local_irq_disable(void) 79 { 80 __asm__ __volatile__(" clri \n" : : : "memory"); 81 } 82 83 /* 84 * save IRQ state 85 */ 86 static inline long arch_local_save_flags(void) 87 { 88 unsigned long temp; 89 90 __asm__ __volatile__( 91 " lr %0, [status32] \n" 92 : "=&r"(temp) 93 : 94 : "memory"); 95 96 return temp; 97 } 98 99 /* 100 * Query IRQ state 101 */ 102 static inline int arch_irqs_disabled_flags(unsigned long flags) 103 { 104 return !(flags & (STATUS_IE_MASK)); 105 } 106 107 static inline int arch_irqs_disabled(void) 108 { 109 return arch_irqs_disabled_flags(arch_local_save_flags()); 110 } 111 112 #else 113 114 .macro IRQ_DISABLE scratch 115 clri 116 .endm 117 118 .macro IRQ_ENABLE scratch 119 seti 120 .endm 121 122 #endif /* __ASSEMBLY__ */ 123 124 #endif 125