1 /* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 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_ARC_IRQFLAGS_H 10 #define __ASM_ARC_IRQFLAGS_H 11 12 /* vineetg: March 2010 : local_irq_save( ) optimisation 13 * -Remove explicit mov of current status32 into reg, that is not needed 14 * -Use BIC insn instead of INVERTED + AND 15 * -Conditionally disable interrupts (if they are not enabled, don't disable) 16 */ 17 18 #ifdef __KERNEL__ 19 20 #include <asm/arcregs.h> 21 22 /* status32 Reg bits related to Interrupt Handling */ 23 #define STATUS_E1_BIT 1 /* Int 1 enable */ 24 #define STATUS_E2_BIT 2 /* Int 2 enable */ 25 #define STATUS_A1_BIT 3 /* Int 1 active */ 26 #define STATUS_A2_BIT 4 /* Int 2 active */ 27 28 #define STATUS_E1_MASK (1<<STATUS_E1_BIT) 29 #define STATUS_E2_MASK (1<<STATUS_E2_BIT) 30 #define STATUS_A1_MASK (1<<STATUS_A1_BIT) 31 #define STATUS_A2_MASK (1<<STATUS_A2_BIT) 32 33 /* Other Interrupt Handling related Aux regs */ 34 #define AUX_IRQ_LEV 0x200 /* IRQ Priority: L1 or L2 */ 35 #define AUX_IRQ_HINT 0x201 /* For generating Soft Interrupts */ 36 #define AUX_IRQ_LV12 0x43 /* interrupt level register */ 37 38 #define AUX_IENABLE 0x40c 39 #define AUX_ITRIGGER 0x40d 40 #define AUX_IPULSE 0x415 41 42 #ifndef __ASSEMBLY__ 43 44 /****************************************************************** 45 * IRQ Control Macros 46 ******************************************************************/ 47 48 /* 49 * Save IRQ state and disable IRQs 50 */ 51 static inline long arch_local_irq_save(void) 52 { 53 unsigned long temp, flags; 54 55 __asm__ __volatile__( 56 " lr %1, [status32] \n" 57 " bic %0, %1, %2 \n" 58 " and.f 0, %1, %2 \n" 59 " flag.nz %0 \n" 60 : "=r"(temp), "=r"(flags) 61 : "n"((STATUS_E1_MASK | STATUS_E2_MASK)) 62 : "memory", "cc"); 63 64 return flags; 65 } 66 67 /* 68 * restore saved IRQ state 69 */ 70 static inline void arch_local_irq_restore(unsigned long flags) 71 { 72 73 __asm__ __volatile__( 74 " flag %0 \n" 75 : 76 : "r"(flags) 77 : "memory"); 78 } 79 80 /* 81 * Unconditionally Enable IRQs 82 */ 83 extern void arch_local_irq_enable(void); 84 85 /* 86 * Unconditionally Disable IRQs 87 */ 88 static inline void arch_local_irq_disable(void) 89 { 90 unsigned long temp; 91 92 __asm__ __volatile__( 93 " lr %0, [status32] \n" 94 " and %0, %0, %1 \n" 95 " flag %0 \n" 96 : "=&r"(temp) 97 : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK)) 98 : "memory"); 99 } 100 101 /* 102 * save IRQ state 103 */ 104 static inline long arch_local_save_flags(void) 105 { 106 unsigned long temp; 107 108 __asm__ __volatile__( 109 " lr %0, [status32] \n" 110 : "=&r"(temp) 111 : 112 : "memory"); 113 114 return temp; 115 } 116 117 /* 118 * Query IRQ state 119 */ 120 static inline int arch_irqs_disabled_flags(unsigned long flags) 121 { 122 return !(flags & (STATUS_E1_MASK 123 #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS 124 | STATUS_E2_MASK 125 #endif 126 )); 127 } 128 129 static inline int arch_irqs_disabled(void) 130 { 131 return arch_irqs_disabled_flags(arch_local_save_flags()); 132 } 133 134 static inline void arch_mask_irq(unsigned int irq) 135 { 136 unsigned int ienb; 137 138 ienb = read_aux_reg(AUX_IENABLE); 139 ienb &= ~(1 << irq); 140 write_aux_reg(AUX_IENABLE, ienb); 141 } 142 143 static inline void arch_unmask_irq(unsigned int irq) 144 { 145 unsigned int ienb; 146 147 ienb = read_aux_reg(AUX_IENABLE); 148 ienb |= (1 << irq); 149 write_aux_reg(AUX_IENABLE, ienb); 150 } 151 152 #else 153 154 #ifdef CONFIG_TRACE_IRQFLAGS 155 156 .macro TRACE_ASM_IRQ_DISABLE 157 bl trace_hardirqs_off 158 .endm 159 160 .macro TRACE_ASM_IRQ_ENABLE 161 bl trace_hardirqs_on 162 .endm 163 164 #else 165 166 .macro TRACE_ASM_IRQ_DISABLE 167 .endm 168 169 .macro TRACE_ASM_IRQ_ENABLE 170 .endm 171 172 #endif 173 174 .macro IRQ_DISABLE scratch 175 lr \scratch, [status32] 176 bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) 177 flag \scratch 178 TRACE_ASM_IRQ_DISABLE 179 .endm 180 181 .macro IRQ_ENABLE scratch 182 lr \scratch, [status32] 183 or \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) 184 flag \scratch 185 TRACE_ASM_IRQ_ENABLE 186 .endm 187 188 #endif /* __ASSEMBLY__ */ 189 190 #endif /* KERNEL */ 191 192 #endif 193