楼主 #1 2019-04-24 22:02:01 分享评论
- 晕哥
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全志芯片主线Linux 启动 eMMC 8-bit 模式测试
https://www.kernel.org/doc/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt
* Allwinner sunxi MMC controller
The highspeed MMC host controller on Allwinner SoCs provides an interface
for MMC, SD and SDIO types of memory cards.
Supported maximum speeds are the ones of the eMMC standard 4.5 as well
as the speed of SD standard 3.0.
Absolute maximum transfer rate is 200MB/s
Required properties:
- compatible : should be one of:
* "allwinner,sun4i-a10-mmc"
* "allwinner,sun5i-a13-mmc"
* "allwinner,sun7i-a20-mmc"
* "allwinner,sun8i-a83t-emmc"
* "allwinner,sun9i-a80-mmc"
* "allwinner,sun50i-a64-emmc"
* "allwinner,sun50i-a64-mmc"
* "allwinner,sun50i-h6-emmc", "allwinner.sun50i-a64-emmc"
* "allwinner,sun50i-h6-mmc", "allwinner.sun50i-a64-mmc"
- reg : mmc controller base registers
- clocks : a list with 4 phandle + clock specifier pairs
- clock-names : must contain "ahb", "mmc", "output" and "sample"
- interrupts : mmc controller interrupt
Optional properties:
- resets : phandle + reset specifier pair
- reset-names : must contain "ahb"
- for cd, bus-width and additional generic mmc parameters
please refer to mmc.txt within this directory
Examples:
- Within .dtsi:
mmc0: mmc@1c0f000 {
compatible = "allwinner,sun5i-a13-mmc";
reg = <0x01c0f000 0x1000>;
clocks = <&ahb_gates 8>, <&mmc0_clk>, <&mmc0_output_clk>, <&mmc0_sample_clk>;
clock-names = "ahb", "mod", "output", "sample";
interrupts = <0 32 4>;
status = "disabled";
};
- Within dts:
mmc0: mmc@1c0f000 {
pinctrl-names = "default", "default";
pinctrl-0 = <&mmc0_pins_a>;
pinctrl-1 = <&mmc0_cd_pin_reference_design>;
bus-width = <4>;
cd-gpios = <&pio 7 1 0>; /* PH1 */
cd-inverted;
status = "okay";
};离线
楼主 #2 2019-04-24 22:04:53 分享评论
- 晕哥
- 管理员
- 注册时间： 2017-09-06
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Re: 全志芯片主线Linux 启动 eMMC 8-bit 模式测试
上面默认是 4bit 模式, 下面试一试把 S3/V3s 的 mmc2 改成 8bit 模式:
sun8i-dtsi 添加:
mmc2_pins: mmc1-pins {
pins = "PC0", "PC1", "PC2", "PC3",
"PC4", "PC5", "PC6", "PC7", "PC8", "PC9", "PC10";
function = "mmc2";
drive-strength = <30>;
bias-pull-up;
};mmc2 改为:
mmc2: mmc@1c11000 {
compatible = "allwinner,sun7i-a20-mmc";
reg = <0x01c11000 0x1000>;
clocks = <&ccu CLK_BUS_MMC2>,
<&ccu CLK_MMC2>,
<&ccu CLK_MMC2_OUTPUT>,
<&ccu CLK_MMC2_SAMPLE>;
clock-names = "ahb",
"mmc",
"output",
"sample";
resets = <&ccu RST_BUS_MMC2>;
reset-names = "ahb";
interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
pinctrl-names = "default", "default";
pinctrl-0 = <&mmc2_pins>;
bus-width = <8>;
status = "disabled";
#address-cells = <1>;
#size-cells = <0>;
};
sun8i-v3s-licheepi-zero.dts 添加:
&mmc2 {
broken-cd;
bus-width = <4>;
vmmc-supply = <®_vcc3v3>;
status = "okay";
};仅有 PC 这组 MMC 可以运行 8bit模式.
驱动程序: https://github.com/torvalds/linux/blob/master/drivers/mmc/host/sunxi-mmc.c
设备树:
https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/sun8i-v3s.dtsi
https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts
离线