MT7688/MT7628-GPIO使用

7688/7628的GPIO一共有47个，GPIO0-GPIO46，这些GPIO有复用的功能，按功能模块进行配置，比如I2C有两根线，将其设置为GPIO模式，则两根就都是GPIO模式了，不可为别的功能。

一般有两种方法配置

1.通过寄存器进行配置

下面的使用前提不要被DTS或者驱动什么占用，如switch芯片的network配置

功能的定义由两个地址寄存器。

GPIO1_MODE = 0x10000060

GPIO2_MODE = 0x10000064

可以看到两个寄存器覆盖了所有的复用引脚，举个例子，如要将GPIO0/1设置成GPIO模式：

先查看GPIO0/1引脚的默认功能如下，为I2S的引脚。

所以需要找到I2S的配置寄存器，以下为部分GPIO1_MODE寄存器的含义：

可看到I2C为GPIO1_MODE的第20:21位。

所以需要做的就是将原本GPIO1_MODE寄存器的值都出来，然后将7:6位设置成01即可。

comnIoctlRegOption(GPIO1_MODE, 0x1 << 6, 0x3 << 6);      //I2S,GPIO0-4000000001
0x1 << 6即 val = 00100000000000011
0x3 << 6即 mask = 011000000reg_val[2] = {0, 0};有两个值，一个是传进去的addr，一个该地址返回的valreg_val[0] = add;
read(fd, reg_val, 8); //reg_val[0]为传入的addr,reg_val[1]为valreg_val[1] &= ~mask; //A &= ~B,将A值的B位清0，即011000000，第6、7位清0
reg_val[1] |= (val & mask); //A |= B,将A值的B位置1，即001000000，第6位置1_INT32 comnIoctlRegOption(_UINT32 add, _UINT32 val, _UINT32 mask)
{int fd = -1;_UINT32 reg_val[2] = {0, 0};fd = open(REG_DEV_NAME , O_RDWR|O_NOCTTY|O_NDELAY);if(fd < 0){printf("comnIoctl(RegOption) Cann't Open %s\r\n", REG_DEV_NAME);return EOS_ERROR;}//set Reset IO Outputreg_val[0] = add;read(fd, reg_val, 8);reg_val[1] &= ~mask;    reg_val[1] |= (val & mask);        write(fd, reg_val, 8);close(fd);return EOS_OK;
}

comnIoctlRegOption(GPIO1_MODE, 0x1 << 10, 0x3 << 10);    //SD,GPIO22-29
comnIoctlRegOption(GPIO1_MODE, 0x1 << 2, 0x3 << 2);      //SPIS,GPIO14-17
comnIoctlRegOption(GPIO1_MODE, 0x1 << 26, 0x3 << 26);    //UART2,GPIO20-21comnIoctlGpioInit(GPIO_SIM_CP, GPIO_DIR_OUT, 1);
comnIoctlGpioInit(GPIO_SIM_PL, GPIO_DIR_OUT, 1);
comnIoctlGpioInit(GPIO_SIM_DET0, GPIO_DIR_IN, 1);
comnIoctlGpioInit(GPIO_SIM_DET1, GPIO_DIR_IN, 1);

#define GPIO1_MODE_ADD  0x10000060
#define GPIO2_MODE_ADD  0x10000064
#define GPIO0_CTRL_ADD  0X10000600
#define GPIO0_DATA_ADD  0X10000620    //read or write data
#define GPIO1_CTRL_ADD  0X10000604
#define GPIO1_DATA_ADD  0X10000624

下面给出几个已经封装好的函数，以前后期直接使用

1、寄存器配置

_INT32 comnIoctlRegOption(_UINT32 add, _UINT32 val, _UINT32 mask)
{int fd = -1;_UINT32 reg_val[2] = {0, 0};fd = open(REG_DEV_NAME , O_RDWR|O_NOCTTY|O_NDELAY);if(fd < 0){printf("comnIoctl(RegOption) Cann't Open %s\r\n", REG_DEV_NAME);return EOS_ERROR;}//set Reset IO Outputreg_val[0] = add;read(fd, reg_val, 8);reg_val[1] &= ~mask;    reg_val[1] |= (val & mask);        write(fd, reg_val, 8);close(fd);return EOS_OK;
}

2、输入输出模式配置

_INT32 comnIoctlGpioInit(_UCHAR8 gpio, _UCHAR8 dir, _UCHAR8 val)
{_INT32 fd = -1;_UINT32 reg_val[2] = {0, 0};_UINT32 gpio_ctrl_reg_add = 0;_UINT32 gpio_data_reg_add = 0;if(gpio < 32){gpio_ctrl_reg_add = REG_GPIO_CTRL0;gpio_data_reg_add = REG_GPIO_DATA0;}else if(gpio >= 32){gpio_ctrl_reg_add = REG_GPIO_CTRL1;gpio_data_reg_add = REG_GPIO_DATA1;gpio -= 32;}fd = open(REG_DEV_NAME , O_RDWR|O_NOCTTY|O_NDELAY);if(fd < 0){printf("comnIoctl(GpioInit) Cann't Open %s\r\n", REG_DEV_NAME);return EOS_ERROR;}//set the io port,out or inreg_val[0] = gpio_ctrl_reg_add;read(fd, reg_val, 8);if(dir == GPIO_DIR_OUT){reg_val[1] |= 1 << gpio;}else if(dir == GPIO_DIR_IN){reg_val[1] &= ~(1 << gpio);}write(fd, reg_val, 8);//set the valreg_val[0] = gpio_data_reg_add;read(fd, reg_val, 8);if(val > 0){reg_val[1] |= 1 << gpio;}else{reg_val[1] &= ~(1 << gpio);}write(fd, reg_val, 8);close(fd);return EOS_OK;
}

3、输出高低

_INT32 comnIoctlGpioSetValue(_UCHAR8 gpio, _UCHAR8 val)
{_INT32 fd = -1;_UINT32 reg_val[2] = {0, 0};_UINT32 gpio_data_reg_add = 0;if((gpio > 63) || (val > 1)){printf("comnIoctl(GpioSetValue) paramer is wrong!\n");return EOS_ERROR;}if(gpio < 32){gpio_data_reg_add = REG_GPIO_DATA0;}else if(gpio >= 32){gpio_data_reg_add = REG_GPIO_DATA1;gpio -= 32;}fd = open(REG_DEV_NAME , O_RDWR|O_NOCTTY|O_NDELAY);if(fd < 0){//printf("comnIoctl(GpioSetValue) Cann't Open %s\r\n", REG_DEV_NAME);return EOS_ERROR;}//输出0/1reg_val[0] = gpio_data_reg_add;read(fd, reg_val, 8);if(val == 0){reg_val[1] &= ~(1 << gpio);}else if(val == 1){reg_val[1] |= 1 << gpio;}write(fd, reg_val, 8);close(fd);return EOS_OK;
}

4、读IO电平

_INT32 comnIoctlGpioGetValue(_UCHAR8 gpio)
{_INT32 fd = -1;_UINT32 reg_val[2] = {0, 0};_UINT32 gpio_data_reg_add = 0;if(gpio > 63){printf("comnIoctl(GpioGetValue) paramer is wrong!\n");return EOS_ERROR;}if(gpio < 32){gpio_data_reg_add = REG_GPIO_DATA0;}else if(gpio >= 32){gpio_data_reg_add = REG_GPIO_DATA1;gpio -= 32;}fd = open(REG_DEV_NAME , O_RDWR|O_NOCTTY|O_NDELAY);if(fd < 0){//printf("comnIoctl(GpioGetValue) Cann't Open %s\r\n", REG_DEV_NAME);return EOS_ERROR;}//输出0/1reg_val[0] = gpio_data_reg_add;read(fd, reg_val, 8);close(fd);return ((reg_val[1] >> gpio) & 1);
}

2.多寄存器控制的GPIO

如上图，SD卡由EPHY_AGPIO_AIO_EN(非EPHY_APGIO_AIO_EN)和SD_MODE两个寄存器控制，都要置1才可以

对于SD_MODE置1比较容易，上面已经给出方法，如下：

comnIoctlRegOption(GPIO1_MODE, 0x1 << 10, 0x3 << 10);    //SD,GPIO22-29

EPHY_AGPIO_AIO_EN即AGPIO_CFG的17-29位置1，为了通用comnIoctlRegOption函数，做如下设置。

comnIoctlRegOption(AGPIO_CFG, 0xF << 17, 0xF << 17);     //EPHY_AGPIO_AIO_EN[4:1],GPIO14-29000001111
0xF << 6即 val = 00001111 00000000 00000000000001111
0xF << 6即 mask = 00001111 00000000 000000000reg_val[2] = {0, 0};有两个值，一个是传进去的addr，一个该地址返回的valreg_val[0] = add;
read(fd, reg_val, 8); //reg_val[0]为传入的addr,reg_val[1]为valreg_val[1] &= ~mask; //A &= ~B,将A值的B位清0，第17-20位清0
reg_val[1] |= (val & mask); //A |= B,将A值的B位置1，第17-20位置1

3.通过DTS进行配置

http://wiki.wrtnode.cc/index.php?title=GPIO资源

DTS格式有点类似Json，一般系统都会有两个dts，一个芯片的dtsi,如：$(TOPDIR)/target/linux/ramips/dts/mt7628an.dts另一个板子的配置dts，如：$(TOPDIR)/target/linux/ramips/dts/WRTNODE2P.dts。板子配置的dts会include芯片的dtsi,如下：

/dts-v1/;/include/ "mt7628an.dtsi"

1、MT7620

mt7620a.dtsi

结合mt7620的datasheet里GPIO pin share schemes以及在mt7620n.dtsi里我们看到有，将GPIO#0到GPIO#72（中间有仅仅做GPO或GPI的）分为四组GPIO0-GPIO3；

对应GPIO0是从GPIO#0开始到GPIO#23，一共有24个；
对应GPIO1是从GPIO#24开始到GPIO#39，一共有16个；
对应GPIO2是从GPIO#40开始到GPIO#71，一共有32个；
对应GPIO3对应的是GPIO#72，仅有一个。

gpio0: gpio@600 {compatible = "ralink,mt7620a-gpio", "ralink,rt2880-gpio";reg = <0x600 0x34>;resets = <&rstctrl 13>;reset-names = "pio";interrupt-parent = <&intc>;interrupts = <6>;gpio-controller;#gpio-cells = <2>;ralink,gpio-base = <0>;ralink,num-gpios = <24>;ralink,register-map = [ 00 04 08 0c20 24 28 2c30 34 ];
};gpio1: gpio@638 {compatible = "ralink,mt7620a-gpio", "ralink,rt2880-gpio";reg = <0x638 0x24>;interrupt-parent = <&intc>;interrupts = <6>;gpio-controller;#gpio-cells = <2>;ralink,gpio-base = <24>;ralink,num-gpios = <16>;ralink,register-map = [ 00 04 08 0c10 14 18 1c20 24 ];status = "disabled";
};gpio2: gpio@660 {compatible = "ralink,mt7620a-gpio", "ralink,rt2880-gpio";reg = <0x660 0x24>;interrupt-parent = <&intc>;interrupts = <6>;gpio-controller;#gpio-cells = <2>;ralink,gpio-base = <40>;ralink,num-gpios = <32>;ralink,register-map = [ 00 04 08 0c10 14 18 1c20 24 ];status = "disabled";
};gpio3: gpio@688 {compatible = "ralink,mt7620a-gpio", "ralink,rt2880-gpio";reg = <0x688 0x24>;interrupt-parent = <&intc>;interrupts = <6>;gpio-controller;#gpio-cells = <2>;ralink,gpio-base = <72>;ralink,num-gpios = <1>;ralink,register-map = [ 00 04 08 0c10 14 18 1c20 24 ];status = "disabled";
};

上面的gpio1/2/3的status = "disabled"，默认是关闭的，如果要使用需要在dts里面打开，如下：

palmbus@10000000 {gpio1: gpio@638 {status = "okay";};gpio2: gpio@660 {status = "okay";};gpio3: gpio@688 {status = "okay";};
}

如果引脚的功能有被复用到的，也需要把复用引脚释放，添加到ralink,group里面，如下：

pinctrl {state_default: pinctrl0 {default {ralink,group = "ephy", "wled", "pa", "i2c", "wdt", "uartf", "spi refclk";ralink,function = "gpio";};};
};

上面的ephy/i2c/spi refclk等名称在build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7628/linux-3.18.29/arch/mips/ralink/mt7620.c里面有定义，如下：

static struct rt2880_pmx_group mt7620a_pinmux_data[] = {GRP("i2c", i2c_grp, 1, MT7620_GPIO_MODE_I2C),GRP("uartf", uartf_grp, MT7620_GPIO_MODE_UART0_MASK,MT7620_GPIO_MODE_UART0_SHIFT),GRP("spi", spi_grp, 1, MT7620_GPIO_MODE_SPI),GRP("uartlite", uartlite_grp, 1, MT7620_GPIO_MODE_UART1),GRP_G("wdt", wdt_grp, MT7620_GPIO_MODE_WDT_MASK,MT7620_GPIO_MODE_WDT_GPIO, MT7620_GPIO_MODE_WDT_SHIFT),GRP("mdio", mdio_grp, 1, MT7620_GPIO_MODE_MDIO),GRP("rgmii1", rgmii1_grp, 1, MT7620_GPIO_MODE_RGMII1),GRP("spi refclk", refclk_grp, 1, MT7620_GPIO_MODE_SPI_REF_CLK),GRP_G("pcie", pcie_rst_grp, MT7620_GPIO_MODE_PCIE_MASK,MT7620_GPIO_MODE_PCIE_GPIO, MT7620_GPIO_MODE_PCIE_SHIFT),GRP_G("nd_sd", nd_sd_grp, MT7620_GPIO_MODE_ND_SD_MASK,MT7620_GPIO_MODE_ND_SD_GPIO, MT7620_GPIO_MODE_ND_SD_SHIFT),GRP("rgmii2", rgmii2_grp, 1, MT7620_GPIO_MODE_RGMII2),GRP("wled", wled_grp, 1, MT7620_GPIO_MODE_WLED),GRP("ephy", ephy_grp, 1, MT7620_GPIO_MODE_EPHY),GRP("pa", pa_grp, 1, MT7620_GPIO_MODE_PA),{ 0 }
};

第一个参数就是名称，第二个参数，对应该组引脚的解析个数，如：

static struct rt2880_pmx_func i2c_grp[] =  { FUNC("i2c", 0, 1, 2) };
static struct rt2880_pmx_func spi_grp[] = { FUNC("spi", 0, 3, 4) };
static struct rt2880_pmx_func uartlite_grp[] = { FUNC("uartlite", 0, 15, 2) };
static struct rt2880_pmx_func mdio_grp[] = { FUNC("mdio", 0, 22, 2) };
static struct rt2880_pmx_func rgmii1_grp[] = { FUNC("rgmii1", 0, 24, 12) };
static struct rt2880_pmx_func refclk_grp[] = { FUNC("spi refclk", 0, 37, 3) };

i2c后面的1，2，代表从gpio1开始，占用2个引脚；spi refclk的37，3，代表从gpio37开始，占用3个引脚；这些跟功能引脚的定义其实是对应的，如下：

gpio-leds {compatible = "gpio-leds";indicator {label = "wrtnode:blue:indicator";gpios = <&gpio1 14 0>;};
};

2、MT7688

mt7628an.dtsi

mt7628an.dtsi里有对gpio的注册,一共将GPIO分为三组，分别为gpio0、gpio1、gpio2
每组gpio包含32个gpio；在WRTnode2R/2P上只用到了gpio0和gpio1两组。

gpio@600 {#address-cells = <1>;#size-cells = <0>;compatible = "mtk,mt7628-gpio", "mtk,mt7621-gpio";reg = <0x600 0x100>;interrupt-parent = <&intc>;interrupts = <6>;gpio0: bank@0 {reg = <0>;compatible = "mtk,mt7621-gpio-bank";gpio-controller;#gpio-cells = <2>;};gpio1: bank@1 {reg = <1>;compatible = "mtk,mt7621-gpio-bank";gpio-controller;#gpio-cells = <2>;};gpio2: bank@2 {reg = <2>;compatible = "mtk,mt7621-gpio-bank";gpio-controller;#gpio-cells = <2>;};
};

与MT7620不同的是，这三组gpio都是开启的，在dts中就不用在操作。

与MT7620相同的是，如果引脚的功能有被复用到的，也需要把复用引脚释放，添加到ralink,group里面，如下：

    pinctrl {state_default: pinctrl0 {gpio {ralink,group = "i2c", "gpio", "jtag";ralink,function = "gpio";};};};

不过MT7620个MT7628的引脚功能分布式不一样的，所以在build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7628/linux-3.18.29/arch/mips/ralink/mt7620.c里定义也是不一样的，如下：

static struct rt2880_pmx_group mt7628an_pinmux_data[] = {GRP_G("pwm1", pwm1_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_PWM1),GRP_G("pwm0", pwm0_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_PWM0),GRP_G("uart2", uart2_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_UART2),GRP_G("uart1", uart1_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_UART1),GRP_G("i2c", i2c_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_I2C),GRP("refclk", refclk_grp_mt7628, 1, MT7628_GPIO_MODE_REFCLK),GRP("perst", perst_grp_mt7628, 1, MT7628_GPIO_MODE_PERST),GRP("wdt", wdt_grp_mt7628, 1, MT7628_GPIO_MODE_WDT),GRP("spi", spi_grp_mt7628, 1, MT7628_GPIO_MODE_SPI),GRP_G("sdmode", sd_mode_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_SDMODE),GRP_G("uart0", uart0_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_UART0),GRP_G("i2s", i2s_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_I2S),GRP_G("spi cs1", spi_cs1_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_CS1),GRP_G("spis", spis_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_SPIS),GRP_G("gpio", gpio_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_GPIO),GRP_G("wled_an", wled_an_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_WLED_AN),GRP_G("wled_kn", wled_kn_grp_mt7628, MT7628_GPIO_MODE_MASK, 1, MT7628_GPIO_MODE_WLED_KN),{ 0 }
};

第二个参数，对应该组引脚的解析个数，如：

static struct rt2880_pmx_func i2c_grp_mt7628[] = {FUNC("-", 3, 4, 2),FUNC("debug", 2, 4, 2),FUNC("gpio", 1, 4, 2),FUNC("i2c", 0, 4, 2),
};

i2c后面的4，2，代表从gpio4开始，占用2个引脚；与MT7620的gpio1-2是不一样的。

gpio_export {compatible = "gpio-export";#size-cells = <0>;lte4power {gpio-export,name = "G4Power";gpio-export,output = <0>;gpios = <&gpio0 29 0>;      //GPIO_ACTIVE_HIGH};lte4reset {gpio-export,name = "G4Reset";gpio-export,output = <0>;gpios = <&gpio0 28 0>;};lte4status {gpio-export,name = "G4Status";gpio-export,input = <0>;gpios = <&gpio0 22 0>;      //GPIO_ACTIVE_HIGH};
}

    gpio-leds {compatible = "gpio-leds";indicator {label = "wrtnode:blue:indicator";gpios = <&gpio1 9 1>;};};gpio-keys-polled {compatible = "gpio-keys-polled";#address-cells = <1>;#size-cells = <0>;poll-interval = <20>;reset {label = "reset";gpios = <&gpio0 5 1>;linux,code = <0x198>;};};root@OpenWrt:/sys/class/leds# ls
wrtnode:blue:indicator