ST16C554驱动程序：
1.在linux-2.6.32.2/driver/serial/下添加驱动程序8250_exar_st16c554.c
源程序如下：
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define PORT(_base,_irq) \
{ \
.iobase = (unsigned long)_base, \
.mapbase = (resource_size_t)_base, \
.irq = _irq, \
.uartclk = 1843200, \
.irqflags = IRQF_TRIGGER_RISING, \
.iotype = UPIO_MEM, \
.flags = (UPF_BOOT_AUTOCONF | UPF_IOREMAP), \
.regshift = 0, \
}
//注意：反斜杠“\”不能丢；
static struct plat_serial8250_port exar_data[] = {
PORT(S3C2410_CS1 + 0x0, IRQ_EINT3),
PORT(S3C2410_CS2 + 0x0, IRQ_EINT17),
PORT(S3C2410_CS3 + 0x0, IRQ_EINT18),
PORT(S3C2410_CS5 + 0x0, IRQ_EINT9),
{ },
};
static struct platform_device exar_device = {
.name = "serial8250",
.id = PLAT8250_DEV_EXAR_ST16C554,
.dev = {
.platform_data = &exar_data,
},
};
static int __init exar_init(void)
{
*((volatile unsigned int *)S3C2410_BWSCON) =
((*((volatile unsigned int *)S3C2410_BWSCON)) & ~(0x30333<<4))
| S3C2410_BWSCON_DW1_8
| S3C2410_BWSCON_DW2_8
| S3C2410_BWSCON_DW3_8
| S3C2410_BWSCON_DW5_8;
//s3c2410_gpio_cfgpin(S3C2410_GPF(3),S3C2410_GPF3_EINT3);
//s3c2410_gpio_cfgpin(S3C2410_GPG(1),S3C2410_GPG1_EINT9);
//s3c2410_gpio_cfgpin(S3C2410_GPG(9),S3C2410_GPG9_EINT17);
//s3c2410_gpio_cfgpin(S3C2410_GPG(10),S3C2410_GPG10_EINT18);
s3c2410_gpio_cfgpin(S3C2410_GPF(6),S3C2410_GPF6_OUTP); //复位STC16C554
s3c2410_gpio_setpin(S3C2410_GPF(6),0);
s3c2410_gpio_setpin(S3C2410_GPF(6),1);
udelay(1000);
s3c2410_gpio_setpin(S3C2410_GPF(6),0);
return platform_device_register(&exar_device);
}
module_init(exar_init);
MODULE_AUTHOR("Paul B Schroeder");
MODULE_DESCRIPTION("8250 serial probe module for Exar cards");
MODULE_LICENSE("GPL");
2.修改Makefile文件
在linux-2.6.32.2/driver/serial/Makefile文件中添加：
obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o
3.添加配置文件
在linux-2.6.32.2/driver/serial/Kconfig文件中添加：
config SERIAL_8250_EXAR_ST16C554
bool "Support Exar ST16C554/554D Quad UART"
#tristate "Support Exar ST16C554/554D Quad UART"
#depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
depends on SERIAL_8250
help
The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
tinkering with your Envoy TU301, or have a machine with this UART,
say Y here.
To compile this driver as a module, choose M here: the module
will be called 8250_exar_st16c554.
4.重新编译内核
# make menucofig
Device Drivers ->
Character Devices ->
Serial Drivers ->
[*] 8250/16c550 and compatible serial support
[*] Support Exar ST16C554/554D Quad UART
保存.config文件
# make zImage
这样驱动就添加好了，如果你的根文件系统使用了mdev，那么不用做任何修改，mdev会自动
地将四个新串口添加在 /dev/serial/tty目录下面，分别为 ttyS0, ttyS1, ttyS2, ttyS3。
5.登陆开发板，查看四个串口的地址
cat /proc/tty/driver/serial 将显示四个串口的物理地址和虚拟地址,显示如下：
#cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:16550A mmio:0x08000000 irq:19 tx:0 rx:0 CTS|DSR|CD|RI
1: uart:16550A mmio:0x10000000 irq:61 tx:0 rx:0 CTS|DSR|CD|RI
2: uart:16550A mmio:0x18000000 irq:62 tx:0 rx:0 DSR|CD|RI
3: uart:16550A mmio:0x28000000 irq:53 tx:0 rx:0 CTS|DSR|CD|RI
STC16C554扩展串口驱动编写完成。