MT7688/MT7628-GPIO使用
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 = 0x10000060image.png
GPIO2_MODE = 0x10000064
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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。
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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：
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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,GPIO0-40000000010x1 << 6即 val = 001000000000000110x3 << 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为传入的addr,reg_val为valreg_val[1] &= ~mask; //A &= ~B,将A值的B位清0，即011000000，第6、7位清0reg_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 Output reg_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,GPIO22-29comnIoctlRegOption(GPIO1_MODE, 0x1 << 2, 0x3 << 2); //SPIS,GPIO14-17comnIoctlRegOption(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_ADD0x10000060#define GPIO2_MODE_ADD0x10000064#define GPIO0_CTRL_ADD0X10000600#define GPIO0_DATA_ADD0X10000620 //read or write data#define GPIO1_CTRL_ADD0X10000604#define GPIO1_DATA_ADD0X10000624
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 Output reg_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 in reg_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 val reg_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0/1 reg_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0/1 reg_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
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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
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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,GPIO14-290000011110xF << 6即 val = 00001111 00000000 000000000000011110xF << 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为传入的addr,reg_val为valreg_val[1] &= ~mask; //A &= ~B,将A值的B位清0，第17-20位清0reg_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%E8%B5%84%E6%BA%90DTS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、MT7620mt7620a.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 0c 20 24 28 2c 30 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 0c 10 14 18 1c 20 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 0c 10 14 18 1c 20 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 0c 10 14 18 1c 20 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：
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gpio-leds { compatible = "gpio-leds"; indicator { label = "wrtnode:blue:indicator"; gpios = <&gpio1 14 0>; };};
2、MT7688mt7628an.dtsimt7628an.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。
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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# lswrtnode:blue:indicator
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