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1 #ifndef _LINUX_IRQ_H |
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2 #define _LINUX_IRQ_H |
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3 |
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4 /* |
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5 * Please do not include this file in generic code. There is currently |
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6 * no requirement for any architecture to implement anything held |
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7 * within this file. |
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8 * |
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9 * Thanks. --rmk |
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10 */ |
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11 |
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12 #include <linux/smp.h> |
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13 |
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14 #ifndef CONFIG_S390 |
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15 |
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16 #include <linux/linkage.h> |
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17 #include <linux/cache.h> |
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18 #include <linux/spinlock.h> |
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19 #include <linux/cpumask.h> |
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20 #include <linux/irqreturn.h> |
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21 #include <linux/irqnr.h> |
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22 #include <linux/errno.h> |
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23 |
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24 #include <asm/irq.h> |
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25 #include <asm/ptrace.h> |
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26 #include <asm/irq_regs.h> |
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27 |
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28 struct irq_desc; |
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29 typedef void (*irq_flow_handler_t)(unsigned int irq, |
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30 struct irq_desc *desc); |
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31 |
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32 |
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33 /* |
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34 * IRQ line status. |
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35 * |
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36 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h |
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37 * |
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38 * IRQ types |
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39 */ |
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40 #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */ |
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41 #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */ |
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42 #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */ |
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43 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING) |
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44 #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */ |
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45 #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */ |
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46 #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */ |
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47 #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */ |
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48 |
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49 /* Internal flags */ |
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50 #define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */ |
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51 #define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */ |
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52 #define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */ |
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53 #define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */ |
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54 #define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */ |
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55 #define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */ |
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56 #define IRQ_LEVEL 0x00004000 /* IRQ level triggered */ |
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57 #define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */ |
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58 #define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */ |
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59 #define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */ |
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60 #define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */ |
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61 #define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */ |
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62 #define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */ |
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63 #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */ |
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64 #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */ |
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65 #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */ |
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66 #define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */ |
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67 #define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/ |
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68 |
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69 #ifdef CONFIG_IRQ_PER_CPU |
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70 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) |
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71 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) |
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72 #else |
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73 # define CHECK_IRQ_PER_CPU(var) 0 |
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74 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING |
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75 #endif |
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76 |
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77 struct proc_dir_entry; |
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78 struct msi_desc; |
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79 |
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80 /** |
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81 * struct irq_chip - hardware interrupt chip descriptor |
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82 * |
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83 * @name: name for /proc/interrupts |
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84 * @startup: start up the interrupt (defaults to ->enable if NULL) |
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85 * @shutdown: shut down the interrupt (defaults to ->disable if NULL) |
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86 * @enable: enable the interrupt (defaults to chip->unmask if NULL) |
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87 * @disable: disable the interrupt (defaults to chip->mask if NULL) |
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88 * @ack: start of a new interrupt |
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89 * @mask: mask an interrupt source |
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90 * @mask_ack: ack and mask an interrupt source |
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91 * @unmask: unmask an interrupt source |
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92 * @eoi: end of interrupt - chip level |
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93 * @end: end of interrupt - flow level |
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94 * @set_affinity: set the CPU affinity on SMP machines |
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95 * @retrigger: resend an IRQ to the CPU |
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96 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ |
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97 * @set_wake: enable/disable power-management wake-on of an IRQ |
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98 * |
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99 * @release: release function solely used by UML |
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100 * @typename: obsoleted by name, kept as migration helper |
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101 */ |
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102 struct irq_chip { |
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103 const char *name; |
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104 unsigned int (*startup)(unsigned int irq); |
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105 void (*shutdown)(unsigned int irq); |
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106 void (*enable)(unsigned int irq); |
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107 void (*disable)(unsigned int irq); |
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108 |
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109 void (*ack)(unsigned int irq); |
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110 void (*mask)(unsigned int irq); |
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111 void (*mask_ack)(unsigned int irq); |
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112 void (*unmask)(unsigned int irq); |
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113 void (*eoi)(unsigned int irq); |
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114 |
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115 void (*end)(unsigned int irq); |
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116 void (*set_affinity)(unsigned int irq, cpumask_t dest); |
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117 int (*retrigger)(unsigned int irq); |
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118 int (*set_type)(unsigned int irq, unsigned int flow_type); |
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119 int (*set_wake)(unsigned int irq, unsigned int on); |
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120 |
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121 /* Currently used only by UML, might disappear one day.*/ |
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122 #ifdef CONFIG_IRQ_RELEASE_METHOD |
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123 void (*release)(unsigned int irq, void *dev_id); |
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124 #endif |
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125 /* |
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126 * For compatibility, ->typename is copied into ->name. |
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127 * Will disappear. |
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128 */ |
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129 const char *typename; |
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130 }; |
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131 |
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132 /** |
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133 * struct irq_desc - interrupt descriptor |
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134 * @irq: interrupt number for this descriptor |
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135 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] |
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136 * @chip: low level interrupt hardware access |
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137 * @msi_desc: MSI descriptor |
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138 * @handler_data: per-IRQ data for the irq_chip methods |
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139 * @chip_data: platform-specific per-chip private data for the chip |
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140 * methods, to allow shared chip implementations |
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141 * @action: the irq action chain |
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142 * @status: status information |
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143 * @depth: disable-depth, for nested irq_disable() calls |
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144 * @wake_depth: enable depth, for multiple set_irq_wake() callers |
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145 * @irq_count: stats field to detect stalled irqs |
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146 * @irqs_unhandled: stats field for spurious unhandled interrupts |
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147 * @last_unhandled: aging timer for unhandled count |
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148 * @lock: locking for SMP |
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149 * @affinity: IRQ affinity on SMP |
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150 * @cpu: cpu index useful for balancing |
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151 * @pending_mask: pending rebalanced interrupts |
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152 * @dir: /proc/irq/ procfs entry |
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153 * @name: flow handler name for /proc/interrupts output |
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154 */ |
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155 struct irq_desc { |
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156 unsigned int irq; |
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157 irq_flow_handler_t handle_irq; |
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158 struct irq_chip *chip; |
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159 struct msi_desc *msi_desc; |
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160 void *handler_data; |
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161 void *chip_data; |
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162 struct irqaction *action; /* IRQ action list */ |
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163 unsigned int status; /* IRQ status */ |
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164 |
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165 unsigned int depth; /* nested irq disables */ |
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166 unsigned int wake_depth; /* nested wake enables */ |
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167 unsigned int irq_count; /* For detecting broken IRQs */ |
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168 unsigned int irqs_unhandled; |
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169 unsigned long last_unhandled; /* Aging timer for unhandled count */ |
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170 spinlock_t lock; |
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171 #ifdef CONFIG_SMP |
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172 cpumask_t affinity; |
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173 unsigned int cpu; |
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174 #endif |
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175 #ifdef CONFIG_GENERIC_PENDING_IRQ |
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176 cpumask_t pending_mask; |
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177 #endif |
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178 #ifdef CONFIG_PROC_FS |
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179 struct proc_dir_entry *dir; |
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180 #endif |
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181 const char *name; |
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182 } ____cacheline_internodealigned_in_smp; |
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183 |
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184 |
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185 extern struct irq_desc irq_desc[NR_IRQS]; |
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186 |
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187 static inline struct irq_desc *irq_to_desc(unsigned int irq) |
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188 { |
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189 return (irq < nr_irqs) ? irq_desc + irq : NULL; |
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190 } |
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191 |
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192 /* |
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193 * Migration helpers for obsolete names, they will go away: |
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194 */ |
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195 #define hw_interrupt_type irq_chip |
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196 typedef struct irq_chip hw_irq_controller; |
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197 #define no_irq_type no_irq_chip |
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198 typedef struct irq_desc irq_desc_t; |
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199 |
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200 /* |
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201 * Pick up the arch-dependent methods: |
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202 */ |
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203 #include <asm/hw_irq.h> |
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204 |
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205 extern int setup_irq(unsigned int irq, struct irqaction *new); |
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206 |
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207 #ifdef CONFIG_GENERIC_HARDIRQS |
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208 |
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209 #ifdef CONFIG_SMP |
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210 |
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211 #ifdef CONFIG_GENERIC_PENDING_IRQ |
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212 |
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213 void move_native_irq(int irq); |
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214 void move_masked_irq(int irq); |
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215 |
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216 #else /* CONFIG_GENERIC_PENDING_IRQ */ |
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217 |
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218 static inline void move_irq(int irq) |
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219 { |
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220 } |
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221 |
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222 static inline void move_native_irq(int irq) |
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223 { |
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224 } |
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225 |
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226 static inline void move_masked_irq(int irq) |
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227 { |
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228 } |
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229 |
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230 #endif /* CONFIG_GENERIC_PENDING_IRQ */ |
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231 |
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232 #else /* CONFIG_SMP */ |
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233 |
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234 #define move_native_irq(x) |
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235 #define move_masked_irq(x) |
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236 |
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237 #endif /* CONFIG_SMP */ |
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238 |
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239 extern int no_irq_affinity; |
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240 |
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241 static inline int irq_balancing_disabled(unsigned int irq) |
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242 { |
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243 struct irq_desc *desc; |
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244 |
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245 desc = irq_to_desc(irq); |
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246 return desc->status & IRQ_NO_BALANCING_MASK; |
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247 } |
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248 |
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249 /* Handle irq action chains: */ |
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250 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action); |
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251 |
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252 /* |
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253 * Built-in IRQ handlers for various IRQ types, |
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254 * callable via desc->chip->handle_irq() |
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255 */ |
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256 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc); |
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257 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); |
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258 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc); |
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259 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc); |
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260 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc); |
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261 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc); |
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262 |
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263 /* |
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264 * Monolithic do_IRQ implementation. |
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265 */ |
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266 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
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267 extern unsigned int __do_IRQ(unsigned int irq); |
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268 #endif |
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269 |
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270 /* |
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271 * Architectures call this to let the generic IRQ layer |
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272 * handle an interrupt. If the descriptor is attached to an |
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273 * irqchip-style controller then we call the ->handle_irq() handler, |
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274 * and it calls __do_IRQ() if it's attached to an irqtype-style controller. |
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275 */ |
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276 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) |
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277 { |
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278 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
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279 desc->handle_irq(irq, desc); |
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280 #else |
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281 if (likely(desc->handle_irq)) |
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282 desc->handle_irq(irq, desc); |
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283 else |
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284 __do_IRQ(irq); |
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285 #endif |
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286 } |
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287 |
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288 static inline void generic_handle_irq(unsigned int irq) |
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289 { |
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290 generic_handle_irq_desc(irq, irq_to_desc(irq)); |
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291 } |
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292 |
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293 /* Handling of unhandled and spurious interrupts: */ |
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294 extern void note_interrupt(unsigned int irq, struct irq_desc *desc, |
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295 int action_ret); |
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296 |
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297 /* Resending of interrupts :*/ |
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298 void check_irq_resend(struct irq_desc *desc, unsigned int irq); |
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299 |
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300 /* Enable/disable irq debugging output: */ |
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301 extern int noirqdebug_setup(char *str); |
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302 |
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303 /* Checks whether the interrupt can be requested by request_irq(): */ |
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304 extern int can_request_irq(unsigned int irq, unsigned long irqflags); |
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305 |
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306 /* Dummy irq-chip implementations: */ |
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307 extern struct irq_chip no_irq_chip; |
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308 extern struct irq_chip dummy_irq_chip; |
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309 |
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310 extern void |
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311 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, |
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312 irq_flow_handler_t handle); |
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313 extern void |
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314 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, |
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315 irq_flow_handler_t handle, const char *name); |
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316 |
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317 extern void |
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318 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, |
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319 const char *name); |
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320 |
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321 /* caller has locked the irq_desc and both params are valid */ |
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322 static inline void __set_irq_handler_unlocked(int irq, |
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323 irq_flow_handler_t handler) |
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324 { |
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325 struct irq_desc *desc; |
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326 |
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327 desc = irq_to_desc(irq); |
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328 desc->handle_irq = handler; |
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329 } |
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330 |
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331 /* |
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332 * Set a highlevel flow handler for a given IRQ: |
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333 */ |
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334 static inline void |
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335 set_irq_handler(unsigned int irq, irq_flow_handler_t handle) |
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336 { |
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337 __set_irq_handler(irq, handle, 0, NULL); |
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338 } |
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339 |
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340 /* |
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341 * Set a highlevel chained flow handler for a given IRQ. |
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342 * (a chained handler is automatically enabled and set to |
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343 * IRQ_NOREQUEST and IRQ_NOPROBE) |
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344 */ |
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345 static inline void |
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346 set_irq_chained_handler(unsigned int irq, |
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347 irq_flow_handler_t handle) |
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348 { |
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349 __set_irq_handler(irq, handle, 1, NULL); |
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350 } |
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351 |
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352 extern void set_irq_noprobe(unsigned int irq); |
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353 extern void set_irq_probe(unsigned int irq); |
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354 |
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355 /* Handle dynamic irq creation and destruction */ |
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356 extern unsigned int create_irq_nr(unsigned int irq_want); |
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357 extern int create_irq(void); |
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358 extern void destroy_irq(unsigned int irq); |
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359 |
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360 /* Test to see if a driver has successfully requested an irq */ |
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361 static inline int irq_has_action(unsigned int irq) |
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362 { |
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363 struct irq_desc *desc = irq_to_desc(irq); |
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364 return desc->action != NULL; |
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365 } |
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366 |
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367 /* Dynamic irq helper functions */ |
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368 extern void dynamic_irq_init(unsigned int irq); |
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369 extern void dynamic_irq_cleanup(unsigned int irq); |
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370 |
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371 /* Set/get chip/data for an IRQ: */ |
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372 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); |
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373 extern int set_irq_data(unsigned int irq, void *data); |
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374 extern int set_irq_chip_data(unsigned int irq, void *data); |
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375 extern int set_irq_type(unsigned int irq, unsigned int type); |
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376 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); |
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377 |
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378 #define get_irq_chip(irq) (irq_to_desc(irq)->chip) |
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379 #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data) |
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380 #define get_irq_data(irq) (irq_to_desc(irq)->handler_data) |
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381 #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc) |
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382 |
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383 #endif /* CONFIG_GENERIC_HARDIRQS */ |
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384 |
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385 #endif /* !CONFIG_S390 */ |
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386 |
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387 #endif /* _LINUX_IRQ_H */ |