at91sam9260ek的板级、irq初始化-小试牛刀

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话不多说，先上代码。

//code path:arch/arm/mach-at91/board-sam9260ek.c

MACHINE_START(AT91SAM9260EK, "Atmel AT91SAM9260-EK")/* Maintainer: Atmel */.phys_io= AT91_BASE_SYS,.io_pg_offst= (AT91_VA_BASE_SYS >> 18) & 0xfffc,.boot_params= AT91_SDRAM_BASE + 0x100,.timer= &at91sam926x_timer,.map_io= ek_map_io,//初始化时钟和7个usart.init_irq= ek_init_irq,<span style="white-space:pre"></span>//macro for interrput definition 各个中断号的优先级定义.init_machine= ek_board_init, //including USB PCI NAND Serial.etc initialization.各个外设初始化MACHINE_END

该结构体的定义，在arch.h定义

#define MACHINE_START(_type,_name)\static const struct machine_desc __mach_desc_##_type\ __used\ __attribute__((__section__(".arch.info.init"))) = {\.nr= MACH_TYPE_##_type,\.name= _name,#define MACHINE_END\};

首先，分析板级初始化的具体步骤:

//platform device register

static void __init ek_board_init(void){/* Serial */at91_add_device_serial(); //9260平台串口设备初始化注册platform device register，还有设备驱动注册driver register，具体在atmel_serial.c/* USB Host */at91_add_device_usbh(&ek_usbh_data);///* USB Device */at91_add_device_udc(&ek_udc_data);///* SPI *///at91_add_device_spi(ek_spi_devices, ARRAY_SIZE(ek_spi_devices));/* NAND */ek_add_device_nand();//nand初始化，定义nand的分区状态，位宽，以及定义nand驱动连接的建立时间、维持时间等，设置nand的总线片选地址范围信息/* Ethernet */at91_add_device_eth(&ek_macb_data);//以太网驱动，设置各个外设管脚功能，具体见下/* MMC *///at91_add_device_mmc(0, &ek_mmc_data);/* I2C *///at91_add_device_i2c(NULL, 0);/* Compact Flash *///at91_add_device_cf(&ek_cf_data);/* SSC (to AT73C213) *///at73c213_set_clk(&at73c213_data);//at91_add_device_ssc(AT91SAM9260_ID_SSC, ATMEL_SSC_TX);/* LEDs *///at91_gpio_leds(ek_leds, ARRAY_SIZE(ek_leds));/* Push Buttons *///ek_add_device_buttons();/* shutdown controller, wakeup button (5 msec low) */at91_sys_write(AT91_SHDW_MR, 0);//给shutdown模式寄存器写0，shutdown主要是用在待机唤醒等需求}

//Ethernet的初始化

void __init at91_add_device_eth(struct at91_eth_data *data){if (!data)return;if (data->phy_irq_pin) {at91_set_gpio_input(data->phy_irq_pin, 0);at91_set_deglitch(data->phy_irq_pin, 1);}/* Pins used for MII and RMII */at91_set_A_periph(AT91_PIN_PA19, 0);/* ETXCK_EREFCK */at91_set_A_periph(AT91_PIN_PA17, 0);/* ERXDV */at91_set_A_periph(AT91_PIN_PA14, 0);/* ERX0 */at91_set_A_periph(AT91_PIN_PA15, 0);/* ERX1 */at91_set_A_periph(AT91_PIN_PA18, 0);/* ERXER */at91_set_A_periph(AT91_PIN_PA16, 0);/* ETXEN */at91_set_A_periph(AT91_PIN_PA12, 0);/* ETX0 */at91_set_A_periph(AT91_PIN_PA13, 0);/* ETX1 */at91_set_A_periph(AT91_PIN_PA21, 0);/* EMDIO */at91_set_A_periph(AT91_PIN_PA20, 0);/* EMDC */if (!data->is_rmii) {at91_set_B_periph(AT91_PIN_PA28, 0);/* ECRS */at91_set_B_periph(AT91_PIN_PA29, 0);/* ECOL */at91_set_B_periph(AT91_PIN_PA25, 0);/* ERX2 */at91_set_B_periph(AT91_PIN_PA26, 0);/* ERX3 */at91_set_B_periph(AT91_PIN_PA27, 0);/* ERXCK */at91_set_B_periph(AT91_PIN_PA23, 0);/* ETX2 */at91_set_B_periph(AT91_PIN_PA24, 0);/* ETX3 */at91_set_B_periph(AT91_PIN_PA22, 0);/* ETXER */}eth_data = *data;platform_device_register(&at91sam9260_eth_device); //设备注册最后都会调用此函数}

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