关于LINUX对926X中断的实现(LINUX2.6.24中试用)一,926X中断的描述对于926X有先进中断控制器控制中断具体对应的中断有0~310为FIQ,1为系统,2~31对应设备.见DATASHEET二,926X中断的LINUX实现1,PIO的输入中断问题,手册描述了PIOA 2PIOB 3PIOC 4LINUX中AT91SAM926X.H定义了所有的中断分配号:** Peripheral identifiers/interrupts.*/#define AT91_ID_FIQ 0 /* Advanced Interrupt Controller (FIQ) */#define AT91_ID_SYS 1 /* System Peripherals */#define AT91SAM9260_ID_PIOA 2 /* Parallel IO Controller A */#define AT91SAM9260_ID_PIOB 3 /* Parallel IO Controller B */#define AT91SAM9260_ID_PIOC 4 /* Parallel IO Controller C */#define AT91SAM9260_ID_ADC5 /* Analog-to-Digital Converter */#define AT91SAM9260_ID_US06 /* USART 0 */#define AT91SAM9260_ID_US17 /* USART 1 */#define AT91SAM9260_ID_US28 /* USART 2 */#define AT91SAM9260_ID_MCI9 /* Multimedia Card Interface */#define AT91SAM9260_ID_UDP10/* USB Device Port */#define AT91SAM9260_ID_TWI11/* Two-Wire Interface */#define AT91SAM9260_ID_SPI0 12/* Serial Peripheral Interface 0 */#define AT91SAM9260_ID_SPI1 13/* Serial Peripheral Interface 1 */#define AT91SAM9260_ID_SSC14/* Serial Synchronous Controller */#define AT91SAM9260_ID_TC017/* Timer Counter 0 */#define AT91SAM9260_ID_TC118/* Timer Counter 1 */#define AT91SAM9260_ID_TC219/* Timer Counter 2 */#define AT91SAM9260_ID_UHP20/* USB Host port */#define AT91SAM9260_ID_EMAC 21/* Ethernet */#define AT91SAM9260_ID_ISI22/* Image Sensor Interface */#define AT91SAM9260_ID_US323/* USART 3 */#define AT91SAM9260_ID_US424/* USART 4 */#define AT91SAM9260_ID_US525/* USART 5 */#define AT91SAM9260_ID_TC326/* Timer Counter 3 */#define AT91SAM9260_ID_TC427/* Timer Counter 4 */#define AT91SAM9260_ID_TC528/* Timer Counter 5 */#define AT91SAM9260_ID_IRQ0 29/* Advanced Interrupt Controller (IRQ0) */#define AT91SAM9260_ID_IRQ1 30/* Advanced Interrupt Controller (IRQ1) */LINUX中AT91SAM926X.C分配中断分配号到PIOA,PIOB,PIOC中:static struct at91_gpio_bank at91sam9260_gpio[] = {{.id = AT91SAM9260_ID_PIOA,.offset = AT91_PIOA, .clock= &pioA_clk,},{.id = AT91SAM9260_ID_PIOB, .offset = AT91_PIOB, .clock= &pioB_clk, },{ .id = AT91SAM9260_ID_PIOC, .offset = AT91_PIOC, .clock= &pioC_clk, }};这里调用允许中断函数At91_gpio_irq_setup();他的定义在gpio.c:static struct at91_gpio_bank *gpio;void __init at91_gpio_irq_setup(void){unsignedpioc, pin;for (pioc = 0, pin = PIN_BASE; // #define PIN_BASE NR_AIC_IRQS，include/asm-arm/arch-at91rm9200/gpio.h中定义 pioc < gpio_banks; pioc++) { void __iomem*controller; unsignedid = gpio[pioc].id; unsignedi; clk_enable(gpio[pioc].clock);//处理/* enable PIO controller’s clock */controller = (void __iomem *) AT91_VA_BASE_SYS + gpio[pioc].offset; __raw_writel(~0, controller + PIO_IDR);set_irq_data(id, (void *) pin); set_irq_chip_data(id, controller);for (i = 0; i < 32; i++, pin++) {/** Can use the "simple" and not "edge" handler since it’s* shorter, and the AIC handles interupts sanely.*/ set_irq_chip(pin, &gpio_irqchip); set_irq_handler(pin, handle_simple_irq); set_irq_flags(pin, IRQF_VALID); }set_irq_chained_handler(id, gpio_irq_handler);
}
}
如果使用PIO IO:直接用int at91_get_gpio_value(unsigned pin)int at91_set_gpio_value(unsigned pin, int value)就可以实现读写啦如果使用PIO的中断呢?一 设置为输入.二 设置毛刺(也可以不设置)三 调用 REQUEST_IRQ()at91_set_gpio_input(AT91_PIN_PB5,1);result = request_irq(AT91_PIN_PB5, kirq_interrupt, SA_INTERRUPT,"kirq", &kirq_dev); if (result < 0){ printk("register irq fail.%d\r\n",result);return result; }/************************************************************************************/实验的结果(查看中断是否产生)/teset/irq # cat /proc/interruptsCPU01:72905 AICat91_tick, atmel_serial10:0 AICat91_udc20:0 AICohci_hcd:usb121: 4754 AICeth069:0GPIOkirq101:1GPIOat91_udcat91_set_gpio_input(AT91_PIN_PA5,1);result = request_irq(AT91_PIN_PA5, kirq_interrupt, SA_INTERRUPT,"kirq", &kirq_dev); if (result < 0){ printk("register irq fail.%d\r\n",result);return result; }实验的结果(查看中断是否产生)/teset/irq # cat /proc/interrupts CPU01: 3295 AICat91_tick, atmel_serial10:0 AICat91_udc20:0 AICohci_hcd:usb121: 1801 AICeth037:1GPIOkirq101:1GPIOat91_udcErr:0四 其他设备的调用就直接用request_irq(IRQ_NUMBER,…)不知道来年，会不会开出一地的记忆和忧愁。
