#define S3C2410_CPUIRQ_OFFSET (16)#define S3C2410_IRQ(x) ((x) + S3C2410_CPUIRQ_OFFSET)#define IRQ_UART0 S3C2410_IRQ(28) /* 44 */ #define S3C2410_IRQSUB(x)S3C2410_IRQ((x)+54)#define IRQ_S3CUART_RX0S3C2410_IRQSUB(0)/* 70 */ #define IRQ_S3CUART_TX0S3C2410_IRQSUB(1)#define IRQ_S3CUART_ERR0S3C2410_IRQSUB(2)void __init s3c24xx_init_irq(void){set_irq_chained_handler(IRQ_UART0, s3c_irq_demux_uart0); }/* uart demux entry points */static void s3c_irq_demux_uart0(unsigned int irq, struct irq_desc *desc){irq = irq;s3c_irq_demux_uart(IRQ_S3CUART_RX0);}static void s3c_irq_demux_uart(unsigned int start){unsigned int subsrc, submsk;unsigned int offset = start - IRQ_S3CUART_RX0;/* read the current pending interrupts, and the mask * for what it is available */subsrc = __raw_readl(S3C2410_SUBSRCPND);submsk = __raw_readl(S3C2410_INTSUBMSK);irqdbf2("s3c_irq_demux_uart: start=%d (%d), subsrc=0x%08x,0x%08x\n",start, offset, subsrc, submsk);subsrc &= ~submsk;subsrc >>= offset;subsrc &= 7;if (subsrc != 0) {if (subsrc & 1) //重新计算子中断号generic_handle_irq(start); //generic_handle_irq调用注册的回调if (subsrc & 2)generic_handle_irq(start+1);if (subsrc & 4)generic_handle_irq(start+2);}}//下面是驱动函数中的代码//注册两个子中断static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {[0] = {.port = {.lock= __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),.iotype= UPIO_MEM,.irq= IRQ_S3CUART_RX0,.uartclk= 0,.fifosize= 16,.ops= &s3c24xx_serial_ops,.flags= UPF_BOOT_AUTOCONF,.line= 0,}},}/* s3c24xx_serial_init_port * * initialise a single serial port from the platform device given */static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, struct s3c24xx_uart_info *info, struct platform_device *platdev){struct uart_port *port = &ourport->port;struct s3c2410_uartcfg *cfg;struct resource *res;int ret;port->mapbase = res->start;port->membase = S3C_VA_UART + res->start - (S3C_PA_UART & 0xfff00000);ret = platform_get_irq(platdev, 0);if (ret < 0)port->irq = 0;else {port->irq = ret;ourport->rx_irq = ret;ourport->tx_irq = ret + 1;}return 0;}static int s3c24xx_serial_startup(struct uart_port *port){struct s3c24xx_uart_port *ourport = to_ourport(port);int ret;ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0, s3c24xx_serial_portname(port), ourport);ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0, s3c24xx_serial_portname(port), ourport);/* the port reset code should have done the correct * register setup for the port controls */if (port->line == 2) {s3c2410_gpio_cfgpin(S3C2410_GPH(6), S3C2410_GPH6_TXD2);s3c2410_gpio_pullup(S3C2410_GPH(6), 1);s3c2410_gpio_cfgpin(S3C2410_GPH(7), S3C2410_GPH7_RXD2);s3c2410_gpio_pullup(S3C2410_GPH(7), 1);}return ret;}
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