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 2
PIOB 3
PIOC 4
LINUX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_ADC 5 /* Analog-to-Digital Converter */
#define AT91SAM9260_ID_US0 6 /* USART 0 */
#define AT91SAM9260_ID_US1 7 /* USART 1 */
#define AT91SAM9260_ID_US2 8 /* USART 2 */
#define AT91SAM9260_ID_MCI 9 /* Multimedia Card Interface */
#define AT91SAM9260_ID_UDP 10 /* USB Device Port */
#define AT91SAM9260_ID_TWI 11 /* Two-Wire Interface */
#define AT91SAM9260_ID_SPI0 12 /* Serial Peripheral Interface 0 */
#define AT91SAM9260_ID_SPI1 13 /* Serial Peripheral Interface 1 */
#define AT91SAM9260_ID_SSC 14 /* Serial Synchronous Controller */
#define AT91SAM9260_ID_TC0 17 /* Timer Counter 0 */
#define AT91SAM9260_ID_TC1 18 /* Timer Counter 1 */
#define AT91SAM9260_ID_TC2 19 /* Timer Counter 2 */
#define AT91SAM9260_ID_UHP 20 /* USB Host port */
#define AT91SAM9260_ID_EMAC 21 /* Ethernet */
#define AT91SAM9260_ID_ISI 22 /* Image Sensor Interface */
#define AT91SAM9260_ID_US3 23 /* USART 3 */
#define AT91SAM9260_ID_US4 24 /* USART 4 */
#define AT91SAM9260_ID_US5 25 /* USART 5 */
#define AT91SAM9260_ID_TC3 26 /* Timer Counter 3 */
#define AT91SAM9260_ID_TC4 27 /* Timer Counter 4 */
#define AT91SAM9260_ID_TC5 28 /* 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: