irq_domain可以理解为一个KV数据库,专门用于在某个IC内部查询hwirq对应的virq。 structirq_domain{// 链表节点,所有的irq_domain会放在一个全局的链表中structlist_headlink;// irq_domain nameconstchar*name;// irq_domain的操作函数集合conststructirq_domain_ops*ops;// `IC`私有数据,不同控制器类型自定义...
通过上述的函数分配virq,也就是softirq,分配一个Irq_data结构,然后将virq设置到irq_data结构中 staticstructirq_data *irq_domain_insert_irq_data(structirq_domain *domain,structirq_data *child) {structirq_data *irq_data; irq_data= kzalloc_node(sizeof(*irq_data), GFP_KERNEL, irq_data_get_node(...
IRQ domain IRQ domain用于将硬件的中断号,转换成Linux系统中的中断号(virtual irq, virq),来张图: 每个中断控制器都对应一个IRQ Domain; 中断控制器驱动通过irq_domain_add_*()接口来创建IRQ Domain; IRQ Domain支持三种映射方式:linearmap(线性映射),tree map(树映射),no map(不映射); linear map:维护固定...
structirq_domain{.../* reverse map data. The linear map gets appended to the irq_domain */irq_hw_number_t hwirq_max;unsignedintrevmap_direct_max_irq;unsignedintrevmap_size;structradix_tree_rootrevmap_tree;unsignedintlinear_revmap[];}; 有个小疑问:irq domain总是把hw no转成virt no,而不做...
irq_domain_add_simple() irq_domain_add_legacy() irq_domain_add_legacy_isa() @@ -115,3 +116,7 @@ The legacy map should only be used if fixed IRQ mappings must be supported. For example, ISA controllers would use the legacy map for mapping Linux IRQs 0-15 so that existing ISA driv...
irq_domain usage === An interrupt controller driver creates and registers an irq_domain by calling one of the irq_domain_add_*() functions (each mapping method has a different allocator function, more on that later). The function @@ -62,15 +66,21 @@ If the driver has the Linux ...
irq_domain interrupt number mapping library The current design of the Linux kernel uses a single large number space where each separate IRQ source is assigned a different number. This is simple when there is only one interrupt controller, but in ...
irq: no irq domain found for /soc/aips-bus@40000000/gpio-controller@4004b000 ! i2c-0 is the bus touchscreen chip is on, 4004b000 is the address of gpio3, where the interrupt pin is. the .dts file: /* I2C-2 (400E_6000): Touch screen */ &i2c2 { cloc...
handle_level_irq() { mask( irq ); ack( irq ); status |=IRQ_INPROGRESS; handle_IRQ_event(); status &=~IRQ_INPROGRESS; unmask( irq ); } 由于irq在整个处理过程中都被屏蔽,所以需要handle_level_irq里的action要尽量简短 handle_edge_irq ...
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