Cortex-A7中断控制器GIC

Cortex-A7中断控制器GIC

中断号

• 芯片内部的中断都会引起IRQ Interrupt
• GIC将所有的中断源(最多1020个中断ID)分为三类:
  1. SPI(SharedPeripheralInterrupt)共享中断，外部中断都属于SPI中断 [ID32-1019]
  2. PPI(PrivatePeripheralInterrupt)私有中断 [ID16-31]
  3. SGI(Software-generatedInterrupt)软件中断，由软件触发引起的中断[ID0-15]

#define NUMBER_OF_INT_VECTORS 160                /**< Number of interrupts in the Vector table */typedef enum IRQn {/* Auxiliary constants */NotAvail_IRQn                = -128,             /**< Not available device specific interrupt *//* Core interrupts */Software0_IRQn               = 0,                /**< Cortex-A7 Software Generated Interrupt 0 */Software1_IRQn               = 1,                /**< Cortex-A7 Software Generated Interrupt 1 */Software2_IRQn               = 2,                /**< Cortex-A7 Software Generated Interrupt 2 */Software3_IRQn               = 3,                /**< Cortex-A7 Software Generated Interrupt 3 */Software4_IRQn               = 4,                /**< Cortex-A7 Software Generated Interrupt 4 */Software5_IRQn               = 5,                /**< Cortex-A7 Software Generated Interrupt 5 */Software6_IRQn               = 6,                /**< Cortex-A7 Software Generated Interrupt 6 */Software7_IRQn               = 7,                /**< Cortex-A7 Software Generated Interrupt 7 */Software8_IRQn               = 8,                /**< Cortex-A7 Software Generated Interrupt 8 */Software9_IRQn               = 9,                /**< Cortex-A7 Software Generated Interrupt 9 */Software10_IRQn              = 10,               /**< Cortex-A7 Software Generated Interrupt 10 */Software11_IRQn              = 11,               /**< Cortex-A7 Software Generated Interrupt 11 */Software12_IRQn              = 12,               /**< Cortex-A7 Software Generated Interrupt 12 */Software13_IRQn              = 13,               /**< Cortex-A7 Software Generated Interrupt 13 */Software14_IRQn              = 14,               /**< Cortex-A7 Software Generated Interrupt 14 */Software15_IRQn              = 15,               /**< Cortex-A7 Software Generated Interrupt 15 */VirtualMaintenance_IRQn      = 25,               /**< Cortex-A7 Virtual Maintenance Interrupt */HypervisorTimer_IRQn         = 26,               /**< Cortex-A7 Hypervisor Timer Interrupt */VirtualTimer_IRQn            = 27,               /**< Cortex-A7 Virtual Timer Interrupt */LegacyFastInt_IRQn           = 28,               /**< Cortex-A7 Legacy nFIQ signal Interrupt */SecurePhyTimer_IRQn          = 29,               /**< Cortex-A7 Secure Physical Timer Interrupt */NonSecurePhyTimer_IRQn       = 30,               /**< Cortex-A7 Non-secure Physical Timer Interrupt */LegacyIRQ_IRQn               = 31,               /**< Cortex-A7 Legacy nIRQ Interrupt *//* Device specific interrupts */IOMUXC_IRQn                  = 32,               /**< General Purpose Register 1 from IOMUXC. Used to notify cores on exception condition while boot. */DAP_IRQn                     = 33,               /**< Debug Access Port interrupt request. */SDMA_IRQn                    = 34,               /**< SDMA interrupt request from all channels. */TSC_IRQn                     = 35,               /**< TSC interrupt. */SNVS_IRQn                    = 36,               /**< Logic OR of SNVS_LP and SNVS_HP interrupts. */LCDIF_IRQn                   = 37,               /**< LCDIF sync interrupt. */RNGB_IRQn                    = 38,               /**< RNGB interrupt. */CSI_IRQn                     = 39,               /**< CMOS Sensor Interface interrupt request. */PXP_IRQ0_IRQn                = 40,               /**< PXP interrupt pxp_irq_0. */SCTR_IRQ0_IRQn               = 41,               /**< SCTR compare interrupt ipi_int[0]. */SCTR_IRQ1_IRQn               = 42,               /**< SCTR compare interrupt ipi_int[1]. */WDOG3_IRQn                   = 43,               /**< WDOG3 timer reset interrupt request. */Reserved44_IRQn              = 44,               /**< Reserved */APBH_IRQn                    = 45,               /**< DMA Logical OR of APBH DMA channels 0-3 completion and error interrupts. */WEIM_IRQn                    = 46,               /**< WEIM interrupt request. */RAWNAND_BCH_IRQn             = 47,               /**< BCH operation complete interrupt. */RAWNAND_GPMI_IRQn            = 48,               /**< GPMI operation timeout error interrupt. */UART6_IRQn                   = 49,               /**< UART6 interrupt request. */PXP_IRQ1_IRQn                = 50,               /**< PXP interrupt pxp_irq_1. */SNVS_Consolidated_IRQn       = 51,               /**< SNVS consolidated interrupt. */SNVS_Security_IRQn           = 52,               /**< SNVS security interrupt. */CSU_IRQn                     = 53,               /**< CSU interrupt request 1. Indicates to the processor that one or more alarm inputs were asserted. */USDHC1_IRQn                  = 54,               /**< USDHC1 (Enhanced SDHC) interrupt request. */USDHC2_IRQn                  = 55,               /**< USDHC2 (Enhanced SDHC) interrupt request. */SAI3_RX_IRQn                 = 56,               /**< SAI3 interrupt ipi_int_sai_rx. */SAI3_TX_IRQn                 = 57,               /**< SAI3 interrupt ipi_int_sai_tx. */UART1_IRQn                   = 58,               /**< UART1 interrupt request. */UART2_IRQn                   = 59,               /**< UART2 interrupt request. */UART3_IRQn                   = 60,               /**< UART3 interrupt request. */UART4_IRQn                   = 61,               /**< UART4 interrupt request. */UART5_IRQn                   = 62,               /**< UART5 interrupt request. */eCSPI1_IRQn                  = 63,               /**< eCSPI1 interrupt request. */eCSPI2_IRQn                  = 64,               /**< eCSPI2 interrupt request. */eCSPI3_IRQn                  = 65,               /**< eCSPI3 interrupt request. */eCSPI4_IRQn                  = 66,               /**< eCSPI4 interrupt request. */I2C4_IRQn                    = 67,               /**< I2C4 interrupt request. */I2C1_IRQn                    = 68,               /**< I2C1 interrupt request. */I2C2_IRQn                    = 69,               /**< I2C2 interrupt request. */I2C3_IRQn                    = 70,               /**< I2C3 interrupt request. */UART7_IRQn                   = 71,               /**< UART-7 ORed interrupt. */UART8_IRQn                   = 72,               /**< UART-8 ORed interrupt. */Reserved73_IRQn              = 73,               /**< Reserved */USB_OTG2_IRQn                = 74,               /**< USBO2 USB OTG2 */USB_OTG1_IRQn                = 75,               /**< USBO2 USB OTG1 */USB_PHY1_IRQn                = 76,               /**< UTMI0 interrupt request. */USB_PHY2_IRQn                = 77,               /**< UTMI1 interrupt request. */DCP_IRQ_IRQn                 = 78,               /**< DCP interrupt request dcp_irq. */DCP_VMI_IRQ_IRQn             = 79,               /**< DCP interrupt request dcp_vmi_irq. */DCP_SEC_IRQ_IRQn             = 80,               /**< DCP interrupt request secure_irq. */TEMPMON_IRQn                 = 81,               /**< Temperature Monitor Temperature Sensor (temperature greater than threshold) interrupt request. */ASRC_IRQn                    = 82,               /**< ASRC interrupt request. */ESAI_IRQn                    = 83,               /**< ESAI interrupt request. */SPDIF_IRQn                   = 84,               /**< SPDIF interrupt. */Reserved85_IRQn              = 85,               /**< Reserved */PMU_IRQ1_IRQn                = 86,               /**< Brown-out event on either the 1.1, 2.5 or 3.0 regulators. */GPT1_IRQn                    = 87,               /**< Logical OR of GPT1 rollover interrupt line, input capture 1 and 2 lines, output compare 1, 2, and 3 interrupt lines. */EPIT1_IRQn                   = 88,               /**< EPIT1 output compare interrupt. */EPIT2_IRQn                   = 89,               /**< EPIT2 output compare interrupt. */GPIO1_INT7_IRQn              = 90,               /**< INT7 interrupt request. */GPIO1_INT6_IRQn              = 91,               /**< INT6 interrupt request. */GPIO1_INT5_IRQn              = 92,               /**< INT5 interrupt request. */GPIO1_INT4_IRQn              = 93,               /**< INT4 interrupt request. */GPIO1_INT3_IRQn              = 94,               /**< INT3 interrupt request. */GPIO1_INT2_IRQn              = 95,               /**< INT2 interrupt request. */GPIO1_INT1_IRQn              = 96,               /**< INT1 interrupt request. */GPIO1_INT0_IRQn              = 97,               /**< INT0 interrupt request. */GPIO1_Combined_0_15_IRQn     = 98,               /**< Combined interrupt indication for GPIO1 signals 0 - 15. */GPIO1_Combined_16_31_IRQn    = 99,               /**< Combined interrupt indication for GPIO1 signals 16 - 31. */GPIO2_Combined_0_15_IRQn     = 100,              /**< Combined interrupt indication for GPIO2 signals 0 - 15. */GPIO2_Combined_16_31_IRQn    = 101,              /**< Combined interrupt indication for GPIO2 signals 16 - 31. */GPIO3_Combined_0_15_IRQn     = 102,              /**< Combined interrupt indication for GPIO3 signals 0 - 15. */GPIO3_Combined_16_31_IRQn    = 103,              /**< Combined interrupt indication for GPIO3 signals 16 - 31. */GPIO4_Combined_0_15_IRQn     = 104,              /**< Combined interrupt indication for GPIO4 signals 0 - 15. */GPIO4_Combined_16_31_IRQn    = 105,              /**< Combined interrupt indication for GPIO4 signals 16 - 31. */GPIO5_Combined_0_15_IRQn     = 106,              /**< Combined interrupt indication for GPIO5 signals 0 - 15. */GPIO5_Combined_16_31_IRQn    = 107,              /**< Combined interrupt indication for GPIO5 signals 16 - 31. */Reserved108_IRQn             = 108,              /**< Reserved */Reserved109_IRQn             = 109,              /**< Reserved */Reserved110_IRQn             = 110,              /**< Reserved */Reserved111_IRQn             = 111,              /**< Reserved */WDOG1_IRQn                   = 112,              /**< WDOG1 timer reset interrupt request. */WDOG2_IRQn                   = 113,              /**< WDOG2 timer reset interrupt request. */KPP_IRQn                     = 114,              /**< Key Pad interrupt request. */PWM1_IRQn                    = 115,              /**< hasRegInstance(`PWM1`)?`Cumulative interrupt line for PWM1. Logical OR of rollover, compare, and FIFO waterlevel crossing interrupts.`:`Reserved`) */PWM2_IRQn                    = 116,              /**< hasRegInstance(`PWM2`)?`Cumulative interrupt line for PWM2. Logical OR of rollover, compare, and FIFO waterlevel crossing interrupts.`:`Reserved`) */PWM3_IRQn                    = 117,              /**< hasRegInstance(`PWM3`)?`Cumulative interrupt line for PWM3. Logical OR of rollover, compare, and FIFO waterlevel crossing interrupts.`:`Reserved`) */PWM4_IRQn                    = 118,              /**< hasRegInstance(`PWM4`)?`Cumulative interrupt line for PWM4. Logical OR of rollover, compare, and FIFO waterlevel crossing interrupts.`:`Reserved`) */CCM_IRQ1_IRQn                = 119,              /**< CCM interrupt request ipi_int_1. */CCM_IRQ2_IRQn                = 120,              /**< CCM interrupt request ipi_int_2. */GPC_IRQn                     = 121,              /**< GPC interrupt request 1. */Reserved122_IRQn             = 122,              /**< Reserved */SRC_IRQn                     = 123,              /**< SRC interrupt request src_ipi_int_1. */Reserved124_IRQn             = 124,              /**< Reserved */Reserved125_IRQn             = 125,              /**< Reserved */CPU_PerformanceUnit_IRQn     = 126,              /**< Performance Unit interrupt ~ipi_pmu_irq_b. */CPU_CTI_Trigger_IRQn         = 127,              /**< CTI trigger outputs interrupt ~ipi_cti_irq_b. */SRC_Combined_IRQn            = 128,              /**< Combined CPU wdog interrupts (4x) out of SRC. */SAI1_IRQn                    = 129,              /**< SAI1 interrupt request. */SAI2_IRQn                    = 130,              /**< SAI2 interrupt request. */Reserved131_IRQn             = 131,              /**< Reserved */ADC1_IRQn                    = 132,              /**< ADC1 interrupt request. */ADC_5HC_IRQn                 = 133,              /**< ADC_5HC interrupt request. */Reserved134_IRQn             = 134,              /**< Reserved */Reserved135_IRQn             = 135,              /**< Reserved */SJC_IRQn                     = 136,              /**< SJC interrupt from General Purpose register. */CAAM_Job_Ring0_IRQn          = 137,              /**< CAAM job ring 0 interrupt ipi_caam_irq0. */CAAM_Job_Ring1_IRQn          = 138,              /**< CAAM job ring 1 interrupt ipi_caam_irq1. */QSPI_IRQn                    = 139,              /**< QSPI1 interrupt request ipi_int_ored. */TZASC_IRQn                   = 140,              /**< TZASC (PL380) interrupt request. */GPT2_IRQn                    = 141,              /**< Logical OR of GPT2 rollover interrupt line, input capture 1 and 2 lines, output compare 1, 2 and 3 interrupt lines. */CAN1_IRQn                    = 142,              /**< Combined interrupt of ini_int_busoff,ini_int_error,ipi_int_mbor,ipi_int_txwarning and ipi_int_waken */CAN2_IRQn                    = 143,              /**< Combined interrupt of ini_int_busoff,ini_int_error,ipi_int_mbor,ipi_int_txwarning and ipi_int_waken */Reserved144_IRQn             = 144,              /**< Reserved */Reserved145_IRQn             = 145,              /**< Reserved */PWM5_IRQn                    = 146,              /**< Cumulative interrupt line. OR of Rollover Interrupt line, Compare Interrupt line and FIFO Waterlevel crossing interrupt line */PWM6_IRQn                    = 147,              /**< Cumulative interrupt line. OR of Rollover Interrupt line, Compare Interrupt line and FIFO Waterlevel crossing interrupt line */PWM7_IRQn                    = 148,              /**< Cumulative interrupt line. OR of Rollover Interrupt line, Compare Interrupt line and FIFO Waterlevel crossing interrupt line */PWM8_IRQn                    = 149,              /**< Cumulative interrupt line. OR of Rollover Interrupt line, Compare Interrupt line and FIFO Waterlevel crossing interrupt line */ENET1_IRQn                   = 150,              /**< ENET1 interrupt */ENET1_1588_IRQn              = 151,              /**< ENET1 1588 Timer interrupt [synchronous] request. */ENET2_IRQn                   = 152,              /**< ENET2 interrupt */ENET2_1588_IRQn              = 153,              /**< MAC 0 1588 Timer interrupt [synchronous] request. */Reserved154_IRQn             = 154,              /**< Reserved */Reserved155_IRQn             = 155,              /**< Reserved */Reserved156_IRQn             = 156,              /**< Reserved */Reserved157_IRQn             = 157,              /**< Reserved */Reserved158_IRQn             = 158,              /**< Reserved */PMU_IRQ2_IRQn                = 159               /**< Brown-out event on either core, gpu or soc regulators. */
} IRQn_Type;

• 申请中断号request_irq

• 释放中断号free_irq

• 中断处理函数irqreturn_t (*irq_handler_t)(int,void*)

• 管理具体的中断

  enable_irq(int irq)

  disable_irq(int irq)

• 管理全局中断

  local_irq_enabel()

  local_irq_disable()

• 保存中断环境

  local_irq_save(flag)

  local_irq_restore(flag)

上半部

• 处理快，不长时间占用CPU
• 处理的内容不希望被别的中断打断
• 处理的任务对时间敏感
• 处理的任务与硬件有关
• 直接在中断服务函数中处理

下半部

• 中断处理耗时

软中断

1. softirq_action表示软中断

   struct softirq_action{void    (*action)(struct softirq_action *);};
   

2. 软中断类型包括：

    enum{HI_SOFTIRQ=0,TIMER_SOFTIRQ,NET_TX_SOFTIRQ,NET_RX_SOFTIRQ,BLOCK_SOFTIRQ,BLOCK_IOPOLL_SOFTIRQ,TASKLET_SOFTIRQ,SCHED_SOFTIRQ,HRTIMER_SOFTIRQ,RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */NR_SOFTIRQS};

3. 注册软中断对应的中断处理函数

   void open_softirq(int nr, void(*action)(struct softirq_action*))

4. 触发软中断

   raise_softirq(int nr)

tasklet

1. tasklet_struct表示tasklet

2. 初始化一个tasklet

   void tasklet_init(struct tasklet_struct *t,void (*func)(unsigned long),unsigned long data)

   或者

   DECLARE_TASKLET(name,func,data)

3. 开始调度tasklet

   void tasklet_schedule(struct tasklet_struct *t)

struct tasklet_struct testtasklet;//takslet处理函数
void tasklet_handler(unsigned int data)
{}//中断处理函数
irqreturn_t test_handler(int irq,void *dev_id)
{//启动tasklet调度tasklet_schedule(&testtasklet);
}//驱动入口函数
static int __init xxx_init(void)
{//初始化tasklettasklet_init(&testtasklet,tasklet_handler,data);//注册中断处理函数request_irq(xxx_irq,test_handler,0,"xxx",&xx_dev);
} 

工作队列

1. workqueue_struct表示一个工作队列

2. 初始化一个工作队列

   INIT_WORK(_work,_func)

   或者

   DECLARE_WORK(n,f)

3. 开始调度工作队列

   schedule_work(stuct work_struct *work)

struct work_struct testwork;//work处理函数
void work_handler(struct work_struct *work)
{}//中断处理函数
irqreturn_t test_handler(int irq,void *dev_id)
{//启动work调度schedule_work(&testwork);
}//驱动入口函数
static int __init xxx_init(void)
{//初始化workINIT_WORK(&testwork,work_handler)//注册中断处理函数request_irq(xxx_irq,test_handler,0,"xxx",&xx_dev);
}