at91sam9260ek的板級、irq初始化-小試牛刀
阿新 • • 發佈：2019-02-03
話不多說，先上程式碼。
//code path:arch/arm/mach-at91/board-sam9260ek.cMACHINE_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,//初始化時鐘和7個usart .init_irq = ek_init_irq,<span style="white-space:pre"> </span>//macro for interrput definition 各個中斷號的優先順序定義 .init_machine = ek_board_init, //including USB PCI NAND Serial.etc initialization.各個外設初始化 MACHINE_END
該結構體的定義，在arch.h定義
#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，分析板級初始化的具體步驟:
//platform device register
static void __init ek_board_init(void) { /* Serial */ at91_add_device_serial(); //9260平臺串列埠裝置初始化註冊platform device register，還有裝置驅動註冊driver register，具體在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，定義nand的分割槽狀態，位寬，以及定義nand驅動連線的建立時間、維持時間等，設定nand的匯流排片選地址範圍資訊 /* Ethernet */ at91_add_device_eth(&ek_macb_data);//乙太網驅動，設定各個外設管腳功能，具體見下 /* 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);//給shutdown模式暫存器寫0，shutdown主要是用在待機喚醒等需求 }
//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); //設備註冊最後都會呼叫此函式
}