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INTC中断控制器
模块功能介绍
intc中断控制器控制处理器的中断源。64bit中断源可以独立控制各个中断的打开和屏蔽。
驱动位置
驱动源码所在位置：
module_drives/drivers/irqchip/irq-ingenic-chip.c
module_drivers/drivers/irqchip/irq-ingenic-cpu.c
设备树配置
设备树所在位置：
kernel内核(version <= 5.10)dts文件路径：
module_driver/dts-stage/x2000/x2000.dtsi
kernel内核(version > 5.10)dts文件路径：
module_driver/dts/x2000/x2000.dtsi
INTC中断控制器描述：
cpuintc: interrupt-controller {
……
};
core_intc: core-intc@0x12300000 {
……
};
设备树默认配置
默认编译会产生intc设备
设备树自定义配置
内核编译配置
内核配置IRQ_INGENIC_CPU，配置说明如下：
Symbol: IRQ_INGENIC_CPU [=y]
Type : boolean
Prompt: cpu interrupt driver
Location:
-> Ingenic device-drivers Configurations
-> [Interrupt] Drivers
Defined at module_drivers/drivers/irqchip/Kconfig:6
Depends on: SOC_X2000 [=y] || SOC_X2100 [=n] || SOC_X2500 [=n] || SOC_M300 [=n]
Selects: IRQ_DOMAIN [=y]
Selected
by: SOC_X2000 [=y] && <choice> || SOC_X2100 [=n]
&& <choice> || SOC_M300 [=n] && <choice> ||
SOC_X2500 [=n] && <choice>
Symbol: INGENIC_INTC_CHIP [=y]
Type : boolean
Prompt: intc v2 interrupt driver
Location:
-> Ingenic device-drivers Configurations
-> [Interrupt] Drivers
-> cpu interrupt driver (IRQ_INGENIC_CPU [=y])
Defined at module_drivers/drivers/irqchip/Kconfig:13
Depends on: IRQ_INGENIC_CPU [=y]
Selects: IRQ_DOMAIN [=y]
Selected
by: SOC_X2000 [=y] && <choice> || SOC_X2100 [=n]
&& <choice> || SOC_M300 [=n] && <choice> ||
SOC_X2500 [=n] && <choice>
内核默认编译配置
内核默认配置intc驱动。
内核自定义编译配置
设备节点生成
驱动注册成功后生成设备节点
/sys/devices/platform/apb/10000000.clock-controller/subsystem/devices/12300000.core-intc
应用程序使用说明
查看中断：
# cat /proc/interrupts
CPU0 CPU1
2: 804742 730919 XBurst2 2 xburst2-intc
3: 51396 90444 XBurst2 3 jz-mailbox
4: 158406 343976 XBurst2 4 core_timerevent
8: 0 0 XBurst2-irqchip 0 as-dma
9: 34037 24092 XBurst2-irqchip 1 13500000.otg, 13500000.otg, dwc2_hsotg:usb1
11: 0 0 XBurst2-irqchip 3 pdma
12: 0 0 XBurst2-irqchip 4 pdmad
14: 0 0 XBurst2-irqchip 6 pwm-interrupt
15: 32684 24604 XBurst2-irqchip 7 13440000.sfc
26: 0 0 XBurst2-irqchip 18 13810000.vic
27: 25 136 XBurst2-irqchip 19 13710000.vic
28: 0 0 XBurst2-irqchip 20 13800000.isp
……
ERR: 0
中断绑定
中断绑定即设置中断的CPU Affinity，让中断只在指定CPU核心上进行响应。
利用echo命令将CPU掩码写入/proc/irq /中断ID/smp_affinity文件中，即可实现修改某一中断的CPU亲和性。
例如：
# cat interrupts
CPU0 CPU1
2: 11613 15978 XBurst2 2 xburst2-intc
3: 13054 11075 XBurst2 3 jz-mailbox
4: 11063 8091 XBurst2 4 core_timerevent
8: 0 0 XBurst2-irqchip 0 as-dma
9: 35 42 XBurst2-irqchip 1 13500000.otg, 13500000.otg, dwc2_hsotg:usb1
11: 0 0 XBurst2-irqchip 3 pdma
12: 0 0 XBurst2-irqchip 4 pdmad
13: 1 0 XBurst2-irqchip 5 mcu
14: 0 0 XBurst2-irqchip 6 pwm-interrupt
15: 10231 14732 XBurst2-irqchip 7 13440000.sfc
26: 0 0 XBurst2-irqchip 18 13810000.vic
27: 0 0 XBurst2-irqchip 19 13710000.vic
28: 0 0 XBurst2-irqchip 20 13800000.isp
29: 0 0 XBurst2-irqchip 21 13700000.isp
30: 120 0 XBurst2-irqchip 22 13470000.hash
35: 0 0 XBurst2-irqchip 27 ingenic-tcu-interrupt
40: 0 0 XBurst2-irqchip 32 rtc 1Hz and alarm
44: 1 1204 XBurst2-irqchip 36 mmc1
52: 1204 0 XBurst2-irqchip 44 uart3
56: 0 0 XBurst2-irqchip 48 mmc2
61: 0 0 XBurst2-irqchip 53 134a0000.mac
66: 4 0 XBurst2-irqchip 58 i2c3
69: 15 0 XBurst2-irqchip 61 i2c0
70: 0 0 XBurst2-irqchip 62 13200000.helix
71: 0 0 XBurst2-irqchip 63 13300000.felix
72: 0 0 GPIO 17 vbus_dete
73: 0 0 GPIO 27 id_dete
74: 0 0 ingenic-adc 0 ingenic-aux
75: 0 0 ingenic-adc 1 ingenic-aux
76: 0 0 ingenic-adc 2 ingenic-aux
77: 0 0 ingenic-adc 3 ingenic-aux
78: 0 0 ingenic-adc 4 ingenic-aux
79: 0 0 ingenic-adc 5 ingenic-aux
80: 0 0 GPIO 21 bluetooth bthostwake
81: 0 0 GPIO 12 13490000.msc cd
82: 0 0 GPIO 31 WAKEUP
83: 0 0 GPIO 25 bootsel0
84: 0 0 GPIO 26 bootsel1
85: 2 0 GPIO 9 gt9xx
ERR: 0
例如第52号中断在cpu0上响应，通过以下修改可以实现只在cpu1上响应。
# echo 2 > smp_affinity
再次查看interrupts。
# cat interrupts
CPU0 CPU1
2: 12160 16479 XBurst2 2 xburst2-intc
3: 13128 11240 XBurst2 3 jz-mailbox
4: 11460 8493 XBurst2 4 core_timerevent
8: 0 0 XBurst2-irqchip 0 as-dma
9: 35 42 XBurst2-irqchip 1 13500000.otg, 13500000.otg, dwc2_hsotg:usb1
11: 0 0 XBurst2-irqchip 3 pdma
12: 0 0 XBurst2-irqchip 4 pdmad
13: 1 0 XBurst2-irqchip 5 mcu
14: 0 0 XBurst2-irqchip 6 pwm-interrupt
15: 10249 14732 XBurst2-irqchip 7 13440000.sfc
26: 0 0 XBurst2-irqchip 18 13810000.vic
27: 0 0 XBurst2-irqchip 19 13710000.vic
28: 0 0 XBurst2-irqchip 20 13800000.isp
29: 0 0 XBurst2-irqchip 21 13700000.isp
30: 120 0 XBurst2-irqchip 22 13470000.hash
35: 0 0 XBurst2-irqchip 27 ingenic-tcu-interrupt
40: 0 0 XBurst2-irqchip 32 rtc 1Hz and alarm
44: 1 1204 XBurst2-irqchip 36 mmc1
52: 1733 501 XBurst2-irqchip 44 uart3
56: 0 0 XBurst2-irqchip 48 mmc2
61: 0 0 XBurst2-irqchip 53 134a0000.mac
66: 4 0 XBurst2-irqchip 58 i2c3
69: 15 0 XBurst2-irqchip 61 i2c0
70: 0 0 XBurst2-irqchip 62 13200000.helix
71: 0 0 XBurst2-irqchip 63 13300000.felix
72: 0 0 GPIO 17 vbus_dete
73: 0 0 GPIO 27 id_dete
74: 0 0 ingenic-adc 0 ingenic-aux
75: 0 0 ingenic-adc 1 ingenic-aux
76: 0 0 ingenic-adc 2 ingenic-aux
77: 0 0 ingenic-adc 3 ingenic-aux
78: 0 0 ingenic-adc 4 ingenic-aux
79: 0 0 ingenic-adc 5 ingenic-aux
80: 0 0 GPIO 21 bluetooth bthostwake
81: 0 0 GPIO 12 13490000.msc cd
82: 0 0 GPIO 31 WAKEUP
83: 0 0 GPIO 25 bootsel0
84: 0 0 GPIO 26 bootsel1
85: 2 0 GPIO 9 gt9xx
ERR: 0
连续cat查看发现其只在cpu1上响应。