5.1.2. 参数配置¶

5.1.2.1. 内核配置¶

在luban根目录下执行 make kernel-menuconfig，进入kernel的功能配置，按如下选择：

Linux
    Device Drivers
        <*> MMC/SD/SDIO card support
            <*>   MMC block device driver
            <*>   Artinchip Memory Card Interface

5.1.2.2. DTS 参数配置¶

5.1.2.2.1. SDMC 的扩展 DTS 参数¶

SDMC驱动基于Linux内核的MMC子系统，MMC子系统中提供了很多常用的参数，如下表：

参数名称	类型	取值范围	功能说明
max-frequenc	正整数	> 0	控制器可输出的最大频率
bus-width	正整数	1, 4, 8	控制器的数据位宽
sd-uhs-sdr50	boolean	有 - 1，无 - 0	配置SDCard的SDR50模式
no-sd	boolean	有 - 1，无 - 0	关闭SDCard的功能支持
no-sdio	boolean	有 - 1，无 - 0	关闭SDIO的功能支持
no-mmc	boolean	有 - 1，无 - 0	关闭eMMC的功能支持

详见代码 drivers/mmc/core/host.c中的函数 mmc_of_parse()。

SDMC驱动在此基础上扩展了两个关于FIFO设置的参数，如下表：

参数名称	类型	取值范围	功能说明
aic,fifo-depth	正整数	[1, 128]	控制器的FIFO深度
aic,fifo-watermark-aligned	boolean	有 - 1，无 - 0	FIFO水位是按2的整数次幂对齐

5.1.2.2.2. D211 配置¶

SDMC V1.0有三个接口：SDMC0、SDMC1、SDMC2，所以在DTS中体现为三个独立的设备节点。

common/d211.dtsi中的参数配置：

sdmc0: sdmc@10440000 {
    compatible = "artinchip,aic-sdmc-v1.0";
    reg = <0x0 0x10440000 0x0 0x1000>;
    interrupts-extended = <&plic0 46 IRQ_TYPE_LEVEL_HIGH>;
    clocks = <&cmu CLK_SDMMC0>;
    clock-names = "ciu";
    resets = <&rst RESET_SDMMC0>;
    reset-names = "reset";
    #address-cells = <1>;
    #size-cells = <0>;
    max-frequency = <24000000>;
    clock-frequency = <48000000>;
    bus-width = <4>;
    fifo-depth = <128>;
};

sdmc1: sdmc@10450000 {
    compatible = "artinchip,aic-sdmc-v1.0";
    reg = <0x0 0x10450000 0x0 0x1000>;
    interrupts-extended = <&plic0 47 IRQ_TYPE_LEVEL_HIGH>;
    clocks = <&cmu CLK_SDMMC1>;
    clock-names = "ciu";
    resets = <&rst RESET_SDMMC1>;
    reset-names = "reset";
    #address-cells = <1>;
    #size-cells = <0>;
    max-frequency = <24000000>;
    clock-frequency = <48000000>;
    bus-width = <4>;
    fifo-depth = <128>;
};

sdmc2: sdmc@10460000 {
    compatible = "artinchip,aic-sdmc-v1.0";
    reg = <0x0 0x10460000 0x0 0x1000>;
    interrupts-extended = <&plic0 48 IRQ_TYPE_LEVEL_HIGH>;
    clocks = <&cmu CLK_SDMMC2>;
    clock-names = "ciu";
    resets = <&rst RESET_SDMMC2>;
    reset-names = "reset";
    #address-cells = <1>;
    #size-cells = <0>;
};

5.1.2.2.3. Board 中的配置¶

如果按以下功能定义三个控制器：

SDMC0 - eMMC
SDMC1 - SDCard
SDMC2 - SDIO

xxx/board.dts中的配置参数如下：

&sdmc0 {
    pinctrl-names = "default";
    pinctrl-0 = <&sdmc0_pins>;
    no-sd;
    no-sdio;
    status = "okay";
};

&sdmc1 {
    pinctrl-names = "default";
    pinctrl-0 = <&sdmc1_pins>;
    no-mmc;
    no-sdio;
    status = "okay";
};

&sdmc2 {
    pinctrl-names = "default";
    pinctrl-0 = <&sdmc2_pins>;
    no-mmc;
    no-sd;
    status = "disabled";
};