| Vineet Gupta | ac4c244 | 2013-01-18 15:12:16 +0530 | [diff] [blame^] | 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 | #ifndef __ASSEMBLY__ |
| 23 | |
| 24 | /****************************************************************** |
| 25 | * IRQ Control Macros |
| 26 | ******************************************************************/ |
| 27 | |
| 28 | /* |
| 29 | * Save IRQ state and disable IRQs |
| 30 | */ |
| 31 | static inline long arch_local_irq_save(void) |
| 32 | { |
| 33 | unsigned long temp, flags; |
| 34 | |
| 35 | __asm__ __volatile__( |
| 36 | " lr %1, [status32] \n" |
| 37 | " bic %0, %1, %2 \n" |
| 38 | " and.f 0, %1, %2 \n" |
| 39 | " flag.nz %0 \n" |
| 40 | : "=r"(temp), "=r"(flags) |
| 41 | : "n"((STATUS_E1_MASK | STATUS_E2_MASK)) |
| 42 | : "cc"); |
| 43 | |
| 44 | return flags; |
| 45 | } |
| 46 | |
| 47 | /* |
| 48 | * restore saved IRQ state |
| 49 | */ |
| 50 | static inline void arch_local_irq_restore(unsigned long flags) |
| 51 | { |
| 52 | |
| 53 | __asm__ __volatile__( |
| 54 | " flag %0 \n" |
| 55 | : |
| 56 | : "r"(flags)); |
| 57 | } |
| 58 | |
| 59 | /* |
| 60 | * Unconditionally Enable IRQs |
| 61 | */ |
| 62 | extern void arch_local_irq_enable(void); |
| 63 | |
| 64 | /* |
| 65 | * Unconditionally Disable IRQs |
| 66 | */ |
| 67 | static inline void arch_local_irq_disable(void) |
| 68 | { |
| 69 | unsigned long temp; |
| 70 | |
| 71 | __asm__ __volatile__( |
| 72 | " lr %0, [status32] \n" |
| 73 | " and %0, %0, %1 \n" |
| 74 | " flag %0 \n" |
| 75 | : "=&r"(temp) |
| 76 | : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK))); |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * save IRQ state |
| 81 | */ |
| 82 | static inline long arch_local_save_flags(void) |
| 83 | { |
| 84 | unsigned long temp; |
| 85 | |
| 86 | __asm__ __volatile__( |
| 87 | " lr %0, [status32] \n" |
| 88 | : "=&r"(temp)); |
| 89 | |
| 90 | return temp; |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Query IRQ state |
| 95 | */ |
| 96 | static inline int arch_irqs_disabled_flags(unsigned long flags) |
| 97 | { |
| 98 | return !(flags & (STATUS_E1_MASK)); |
| 99 | } |
| 100 | |
| 101 | static inline int arch_irqs_disabled(void) |
| 102 | { |
| 103 | return arch_irqs_disabled_flags(arch_local_save_flags()); |
| 104 | } |
| 105 | |
| 106 | static inline void arch_mask_irq(unsigned int irq) |
| 107 | { |
| 108 | unsigned int ienb; |
| 109 | |
| 110 | ienb = read_aux_reg(AUX_IENABLE); |
| 111 | ienb &= ~(1 << irq); |
| 112 | write_aux_reg(AUX_IENABLE, ienb); |
| 113 | } |
| 114 | |
| 115 | static inline void arch_unmask_irq(unsigned int irq) |
| 116 | { |
| 117 | unsigned int ienb; |
| 118 | |
| 119 | ienb = read_aux_reg(AUX_IENABLE); |
| 120 | ienb |= (1 << irq); |
| 121 | write_aux_reg(AUX_IENABLE, ienb); |
| 122 | } |
| 123 | |
| 124 | #else |
| 125 | |
| 126 | .macro IRQ_DISABLE scratch |
| 127 | lr \scratch, [status32] |
| 128 | bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) |
| 129 | flag \scratch |
| 130 | .endm |
| 131 | |
| 132 | .macro IRQ_DISABLE_SAVE scratch, save |
| 133 | lr \scratch, [status32] |
| 134 | mov \save, \scratch /* Make a copy */ |
| 135 | bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) |
| 136 | flag \scratch |
| 137 | .endm |
| 138 | |
| 139 | .macro IRQ_ENABLE scratch |
| 140 | lr \scratch, [status32] |
| 141 | or \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) |
| 142 | flag \scratch |
| 143 | .endm |
| 144 | |
| 145 | #endif /* __ASSEMBLY__ */ |
| 146 | |
| 147 | #endif /* KERNEL */ |
| 148 | |
| 149 | #endif |