Linux driver interrupt management (for mini2440)

The interrupts of the 2440 processor are organized into two layers: primary interrupts and secondary interrupts, and a total of 60 interrupt sources can be handled.

After the primary interrupt and secondary interrupt are abstracted by the interrupt architecture, we do not need to consider these two layers of interrupts when writing the driver. We can directly use

request_irq registers one of the 60 interrupt sources and you can use the interrupt directly.

    err = request_irq(button_irqs[i].irq, buttons_interrupt, NULL,

                      button_irqs[i].name, (void *)&button_irqs[i]);

    set_irq_type(button_irqs[i].irq, IRQT_BOTHEDGE);

Use interrupts like above.

Below are the main interrupts 0~31, a total of 32 interrupt sources (32bit)

The interrupt number is defined in the irqs.h header file

/* linux/arch/arm/mach-s3c24a0/include/mach/irqs.h

 *

 * Copyright (c) 2003-2005 Simtec Electronics

 * Ben Dooks

 *

 * This program is free software; you can redistribute it and/or modify

 * it is under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

*/

#ifndef __ASM_ARCH_24A0_IRQS_H

#define __ASM_ARCH_24A0_IRQS_H __FILE__

#define IRQ_EINT0t2 S3C2410_IRQ(0) /* 16 */

/* for generic entry-macro.S */

#define IRQ_EINT0 IRQ_EINT0t2

#define IRQ_EINT3t6 S3C2410_IRQ(1)

#define IRQ_EINT7t10 S3C2410_IRQ(2)

#define IRQ_EINT11t14 S3C2410_IRQ(3)

#define IRQ_EINT15t18 S3C2410_IRQ(4) /* 20 */

#define IRQ_TICK S3C2410_IRQ(5)

#define IRQ_DCTQ S3C2410_IRQ(6)

#define IRQ_MC S3C2410_IRQ(7)

#define IRQ_ME S3C2410_IRQ(8) /* 24 */

#define IRQ_KEYPAD S3C2410_IRQ(9)

#define IRQ_TIMER0 S3C2410_IRQ(10)

#define IRQ_TIMER1 S3C2410_IRQ(11)

#define IRQ_TIMER2 S3C2410_IRQ(12)

#define IRQ_TIMER3_4 S3C2410_IRQ(13)

#define IRQ_OS_TIMER IRQ_TIMER3_4

#define IRQ_LCD S3C2410_IRQ(14)

#define IRQ_CAM_C S3C2410_IRQ(15)

#define IRQ_WDT_BATFLT S3C2410_IRQ(16) /* 32 */

#define IRQ_UART0 S3C2410_IRQ(17)

#define IRQ_CAM_P S3C2410_IRQ(18)

#define IRQ_MODEM S3C2410_IRQ(19)

#define IRQ_DMA S3C2410_IRQ(20)

#define IRQ_SDI S3C2410_IRQ(21)

#define IRQ_SPI0 S3C2410_IRQ(22)

#define IRQ_UART1 S3C2410_IRQ(23)

#define IRQ_AC97_NFLASH S3C2410_IRQ(24) /* 40 */

#define IRQ_USBD S3C2410_IRQ(25)

#define IRQ_USBH S3C2410_IRQ(26)

#define IRQ_IIC S3C2410_IRQ(27)

#define IRQ_IRDA_MSTICK S3C2410_IRQ(28) /* 44 */

#define IRQ_VLX_SPI1 S3C2410_IRQ(29)

#define IRQ_RTC S3C2410_IRQ(30) /* 46 */

#define IRQ_ADC_PEN S3C2410_IRQ(31)

/* interrupts generated from the external interrupts sources */

#define IRQ_EINT00 S3C2410_IRQ(32) /* 48 */

#define IRQ_EINT1 S3C2410_IRQ(33)

#define IRQ_EINT2 S3C2410_IRQ(34)

#define IRQ_EINT3 S3C2410_IRQ(35)

#define IRQ_EINT4 S3C2410_IRQ(36)

#define IRQ_EINT5 S3C2410_IRQ(37)

#define IRQ_EINT6 S3C2410_IRQ(38)

#define IRQ_EINT7 S3C2410_IRQ(39)

#define IRQ_EINT8 S3C2410_IRQ(40)

#define IRQ_EINT9 S3C2410_IRQ(41)

#define IRQ_EINT10 S3C2410_IRQ(42)

#define IRQ_EINT11 S3C2410_IRQ(43)

#define IRQ_EINT12 S3C2410_IRQ(44)

#define IRQ_EINT13 S3C2410_IRQ(45)

#define IRQ_EINT14 S3C2410_IRQ(46)

#define IRQ_EINT15 S3C2410_IRQ(47)

#define IRQ_EINT16 S3C2410_IRQ(48)

#define IRQ_EINT17 S3C2410_IRQ(49)

#define IRQ_EINT18 S3C2410_IRQ(50)

#define IRQ_EINT_BIT(x) ((x) - IRQ_EINT00)

/* SUB IRQS */

#define IRQ_S3CUART_RX0 S3C2410_IRQ(51) /* 67 */

#define IRQ_S3CUART_TX0 S3C2410_IRQ(52)

#define IRQ_S3CUART_ERR0 S3C2410_IRQ(53)

#define IRQ_S3CUART_RX1 S3C2410_IRQ(54)

#define IRQ_S3CUART_TX1 S3C2410_IRQ(55)

#define IRQ_S3CUART_ERR1 S3C2410_IRQ(56)

#define IRQ_S3CUART_RX2 (0x0)

#define IRQ_S3CUART_TX2 (0x0)

#define IRQ_S3CUART_ERR2 (0x0)

#define IRQ_IRDA S3C2410_IRQ(57)

#define IRQ_MSTICK S3C2410_IRQ(58)

#define IRQ_RESERVED0 S3C2410_IRQ(59)

#define IRQ_RESERVED1 S3C2410_IRQ(60)

#define IRQ_RESERVED2 S3C2410_IRQ(61)

#define IRQ_TIMER3 S3C2410_IRQ(62)

#define IRQ_TIMER4 S3C2410_IRQ(63)

#define IRQ_WDT S3C2410_IRQ(64)

#define IRQ_BATFLT S3C2410_IRQ(65)

#define IRQ_POST S3C2410_IRQ(66)

#define IRQ_DISP_FIFO S3C2410_IRQ(67)

#define IRQ_PENUP S3C2410_IRQ(68)

#define IRQ_PENDN S3C2410_IRQ(69)

#define IRQ_ADC S3C2410_IRQ(70)

#define IRQ_DISP_FRAME S3C2410_IRQ(71)

#define IRQ_NFLASH S3C2410_IRQ(72)

#define IRQ_AC97 S3C2410_IRQ(73)

#define IRQ_SPI1 S3C2410_IRQ(74)

#define IRQ_VLX S3C2410_IRQ(75)

#define IRQ_DMA0 S3C2410_IRQ(76)

#define IRQ_DMA1 S3C2410_IRQ(77)

#define IRQ_DMA2 S3C2410_IRQ(78)

#define IRQ_DMA3 S3C2410_IRQ(79)

#define IRQ_TC (0x0)

#define NR_IRQS (IRQ_DMA3+1)

#endif /* __ASM_ARCH_24A0_IRQS_H */