//添加头文件 #include <linux/init.h> #include <linux/module.h> #include <linux/gpio.h> static int led_major; static struct class *led_cls; /* gpio 内存映射地址 */ static unsigned long *gpio_addr = NULL; static unsigned long *iou_slcr = NULL; /* gpio 寄存器物理基地址 */ #define GPIO_BASE_ADDR 0xFF0A0000 #define IOU_SLCR_ADDR 0xFF180000 /* gpio 寄存器所占空间大小 */ #define GPIO_BASE_SIZE 0x368 #define IOU_SLCR_SIZE 0x714 /* gpio 引脚设置GPIO功能*/ #define GPIO_PIN_40 (unsigned int *)((unsigned long)iou_slcr + 0x000000A0) #define GPIO_PIN_42 (unsigned int *)((unsigned long)iou_slcr + 0x000000A8) /* gpio 控制电流0*/ #define IOU_SLCR_BANK1_CTRL0 (unsigned int *)((unsigned long)iou_slcr + 0x00000154) /* gpio 控制电流1*/ #define IOU_SLCR_BANK1_CTRL1 (unsigned int *)((unsigned long)iou_slcr + 0x00000158) /* gpio 输入引脚选择Schmitt或CMOS*/ #define IOU_SLCR_BANK1_CTRL3 (unsigned int *)((unsigned long)iou_slcr + 0x0000015C) /* gpio 设置上下拉*/ #define IOU_SLCR_BANK1_CTRL4 (unsigned int *)((unsigned long)iou_slcr + 0x00000160) /* gpio 使能上下拉*/ #define IOU_SLCR_BANK1_CTRL5 (unsigned int *)((unsigned long)iou_slcr + 0x00000164) /* gpio 引脚速率选择*/ #define IOU_SLCR_BANK1_CTRL6 (unsigned int *)((unsigned long)iou_slcr + 0x00000168) /* gpio 方向寄存器 */ #define GPIO_DIRM_1 (unsigned int *)((unsigned long)gpio_addr + 0x00000244) /* gpio 使能寄存器 */ #define GPIO_OEN_1 (unsigned int *)((unsigned long)gpio_addr + 0x00000248) /* gpio 输出数据寄存器 */ #define GPIO_DATA_1 (unsigned int *)((unsigned long)gpio_addr + 0x00000044) /* gpio 输出数据控制寄存器1 */ #define GPIO_MASK_DATA_1_LSW (unsigned int *)((unsigned long)gpio_addr + 0x00000008) /* gpio 输出数据控制寄存器2 */ #define GPIO_MASK_DATA_1_MSW (unsigned int *)((unsigned long)gpio_addr + 0x0000000C) const struct file_operations led_fops = {}; //实现装载入口函数和卸载入口函数 static __init int led_drv_v1_init(void) { printk("-------^v^-------\n"); printk("-led drv v1 init-\n"); //申请主设备号 led_major = register_chrdev(0, "led_drv_v1", &led_fops); if (led_major < 0) { printk("register chrdev faile!\n"); return led_major; } printk("register chrdev ok!\n"); //创建设备节点 //创建设备的类别 led_cls = class_create(THIS_MODULE, "led_class"); printk("class create ok!\n"); //创建设备 device_create(led_cls, NULL, MKDEV(led_major, 0), NULL, "Myled%d", 0); printk("device create ok!\n"); //1.内存映射 gpio_addr = ioremap(GPIO_BASE_ADDR, GPIO_BASE_SIZE); iou_slcr = ioremap(IOU_SLCR_ADDR, IOU_SLCR_SIZE); printk("gpio_addr init over!\n"); //2.MIO40 MIO42 设置成GPIO，参考手册设置 iowrite32((ioread32(GPIO_PIN_40) & 0x0), GPIO_PIN_40); printk("gpio MIO40 init over!\n"); iowrite32((ioread32(GPIO_PIN_42) & 0x0), GPIO_PIN_42); printk("gpio MIO42 init over!\n"); // //3.MIO40 MIO42设置输出驱动电流大小 // // 将 0x3FFFFFF 和 0x0 转换为二进制。 // // 0011 1111 1111 1111 1111 1111 1111 // // 0000 0000 0000 0000 0000 0000 0000 // // 参考手册，可以知道每一位的地址都是由 CTRL0 和 CTRL1 控制的，在这里都是 10， 查看手册得 8 mA。 iowrite32((ioread32(IOU_SLCR_BANK1_CTRL0) | 0x3FFFFFF), IOU_SLCR_BANK1_CTRL0); iowrite32((ioread32(IOU_SLCR_BANK1_CTRL1) & 0x0), IOU_SLCR_BANK1_CTRL1); //4.选择引脚是Schmitt还是CMOS iowrite32((ioread32(IOU_SLCR_BANK1_CTRL3) & 0x0), IOU_SLCR_BANK1_CTRL3); //5.输出管脚上下拉及使能 iowrite32((ioread32(IOU_SLCR_BANK1_CTRL4) | 0x3FFFFFF), IOU_SLCR_BANK1_CTRL4); iowrite32((ioread32(IOU_SLCR_BANK1_CTRL5) | 0x3FFFFFF), IOU_SLCR_BANK1_CTRL5); //6.MIO速率的选择 iowrite32((ioread32(IOU_SLCR_BANK1_CTRL6) & 0x0), IOU_SLCR_BANK1_CTRL6); //7.MIO40 MIO42 设置成输出 // 40 - 26 = 14, 42 - 26 = 16 // 0000 0000 000|0 0|000 0000 0000 0000 // |16 |14 // 0000 0000 000 1 0 100 0000 0000 0000 // 0000 0000 0001 0100 0000 0000 0000 // 0x00014000 iowrite32((ioread32(GPIO_DIRM_1) | 0x00014000), GPIO_DIRM_1); //MIO40 MIO42 使能 iowrite32((ioread32(GPIO_OEN_1) | 0x00014000), GPIO_OEN_1); /* MASK_DATA方式按灭LED1，LED2，这个需要自己修改相关参数 */ //iowrite32((ioread32(GPIO_MASK_DATA_0_LSW ) & 0xFEFFEFFF), GPIO_MASK_DATA_0_LSW ); //printk("GPIO_MASK_DATA_0_LSW = 0x%x\n", *GPIO_MASK_DATA_0_LSW); //iowrite32((ioread32(GPIO_MASK_DATA_0_MSW ) & 0xFEFFEFFF), GPIO_MASK_DATA_0_MSW ); //printk("GPIO_MASK_DATA_0_MSW = 0x%x\n", *GPIO_MASK_DATA_0_MSW); //8.DATA方式按灭LED1，LED2 // 1111 1111 1111 111|1 1|111 1111 1111 1111 // |0 |0 // 1111 1111 1111 1110 1011 1111 1111 1111 // 0xFFFEBFFF // iowrite32((ioread32(GPIO_DATA_1) & 0xFFFEBFFF), GPIO_DATA_1); iowrite32((ioread32(GPIO_DATA_1) & 0xFFFEFFFF), GPIO_DATA_1); printk("GPIO_DATA_1 = 0x%x\n", *GPIO_DATA_1); return 0; } static __exit void led_drv_v1_exit(void) { iowrite32((ioread32(GPIO_DATA_1) | 0xFFFFFFFF), GPIO_DATA_1); //9.内存释放 iounmap(gpio_addr); iounmap(iou_slcr); //删除设备 device_destroy(led_cls, MKDEV(led_major, 0)); //删除类 class_destroy(led_cls); //注销主设备号 unregister_chrdev(led_major, "led_drv_v1"); printk("-------^v^-------\n"); printk("-led drv v1 exit-\n"); } //申明装载入口函数和卸载入口函数 module_init(led_drv_v1_init); module_exit(led_drv_v1_exit); //添加GPL协议 MODULE_LICENSE("GPL"); MODULE_AUTHOR("msxbo");