海思HI35xx CPU温度监测
海思CPU温度采集单元软件开发分为驱动程序部分和用户态软件开发，其中驱动程序部分主要是与硬件交互，实现底层数据采集转换工作，而用户态则主要是程序应用逻辑控制设计。用户态程序设计流程如下：
1.设置温度采集模式
2.设置温度采集周期
3.设置温度报警上限阈值
4.设置温度报警下线阈值
5.使能启动温度采集
6.读取CPU温度值
7.读取温度报警上限标志
8.读取温度报警下限标志
根据文档，编写驱动。示例
static long HiTsensor_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
Hi_Tsensor_info hitsensor_info;
unsigned int tmp = 0;
u32 reg_data;
//printk("cmd = %04x\n",cmd);
switch(cmd)
{
case SET_MODE:
{
copy_from_user(&hitsensor_info, (Hi_Tsensor_info*)arg, sizeof(Hi_Tsensor_info));
reg_data = readl((volatile void __iomem *)PERI_PMC68);
if(hitsensor_info.value == 1)
{
reg_data |= 1 << 29;
}
else
{
reg_data &= ~(1 << 29);
}
writel(reg_data, (volatile void __iomem *)PERI_PMC68);
}
break;
case SET_PERIOD:
{
copy_from_user(&hitsensor_info, (Hi_Tsensor_info*)arg, sizeof(Hi_Tsensor_info));
tmp = (hitsensor_info.value >> 1) | 0x1;
tmp = tmp & 0xFF;
reg_data = readl((volatile void __iomem *)PERI_PMC68);
reg_data &= 0xFF00FFFF;
reg_data |= tmp << 16;
writel(reg_data, (volatile void __iomem *)PERI_PMC68);
}
break;
case SET_OVERUP:
{
copy_from_user(&hitsensor_info, (Hi_Tsensor_info*)arg, sizeof(Hi_Tsensor_info));
reg_data = (hitsensor_info.value&0x3FF) << 16;
writel(reg_data, (volatile void __iomem *)PERI_PMC69);
}
break;
case SET_OVERDN:
{
copy_from_user(&hitsensor_info, (Hi_Tsensor_info*)arg, sizeof(Hi_Tsensor_info));
reg_data = readl((volatile void __iomem *)PERI_PMC69);
reg_data |= hitsensor_info.value&0x3FF;
writel(reg_data, (volatile void __iomem *)PERI_PMC69);
}
break;
case SET_START:
{
copy_from_user(&hitsensor_info, (Hi_Tsensor_info*)arg, sizeof(Hi_Tsensor_info));
reg_data = readl((volatile void __iomem *)PERI_PMC68);
if(hitsensor_info.value == 1)
{
reg_data |= 1 << 30;
}
else
{
reg_data &= ~(1 << 30);
}
writel(reg_data, (volatile void __iomem *)PERI_PMC68);
}
break;
case GET_TEMPER:
{
copy_from_user(&hitsensor_info, (Hi_Tsensor_info*)arg, sizeof(Hi_Tsensor_info));
tmp = readl((volatile void __iomem *)PERI_PMC70);
hitsensor_info.value = tmp & 0x3FF;
copy_to_user((void __user *)arg, &hitsensor_info, sizeof(Hi_Tsensor_info));
}
break;
case GET_OVERUP:
{
copy_from_user(&hitsensor_info, (Hi_Tsensor_info*)arg, sizeof(Hi_Tsensor_info));
tmp = readl((volatile void __iomem *)PERI_PMC74);
hitsensor_info.value = tmp & 0x1;
copy_to_user((void __user *)arg, &hitsensor_info, sizeof(Hi_Tsensor_info));
}
break;
case GET_OVERDN:
{
copy_from_user(&hitsensor_info, (Hi_Tsensor_info*)arg, sizeof(Hi_Tsensor_info));
tmp = readl((volatile void __iomem *)PERI_PMC74);
hitsensor_info.value = (tmp >> 1) & 0x1;
copy_to_user((void __user *)arg, &hitsensor_info, sizeof(Hi_Tsensor_info));
}
break;
default:
{
printk(KERN_ERR "HiTsensor error Unkown parameter\n");
return -1;
}
break;
}
return 0;
}
static struct file_operations hitsensor_fops = {
owner:THIS_MODULE,
open:HiTsensor_open,
unlocked_ioctl:HiTsensor_ioctl,
release:HiTsensor_release,
};
static struct miscdevice hitsensor_dev = {
MISC_DYNAMIC_MINOR,
"hi_tsensor",
&hitsensor_fops,
};
static int __init hi_tsensor_init(void)
{
signed int ret = 0;
ret = misc_register(&hitsensor_dev);
if (ret)
{
printk(KERN_ERR "register misc dev for /dev/hi_tsensor fail!\n");
return ret;
}
//printk("HiTsensor overup = %d overdown = %d \n",overup,overdown);
return 0;
}
static void __exit hi_tsensor_exit(void)
{
writel(0x0, (volatile void __iomem *)PERI_PMC68);
misc_deregister(&hitsensor_dev);
}
module_init(hi_tsensor_init);
module_exit(hi_tsensor_exit);
MODULE_AUTHOR("Gavin");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Hi_Tsensor interface for HI3521d");
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