【TINY4412】LINUX移植笔记：（6）eMMC驱动
2018-01-14 21:19
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【TINY4412】LINUX移植笔记：（6）eMMC驱动
宿主机 ： 虚拟机 Ubuntu 16.04 LTS / X64目标板[底板]： Tiny4412SDK - 1506
目标板[核心板]： Tiny4412 - 1412
LINUX内核： 4.12.0
交叉编译器： gcc-arm-none-eabi-5_4-2016q3
日期： 2017-7-13 21:09:23
作者： SY
简介
SD卡和
eMMC都属于存储设备。在
Nand Flash的硬件上增加一个控制器与主机通信，减少了与主机大量的连线
SD卡有4条数据总线，
eMMC有8条数据总线，理论上
eMMC具有更快的数据传输速度
参考手册
Exynos 4412 SCP_Users Manual_Ver.0.10.00_Preliminary0.pdf
c 23 Mobile Storage Host 23.5 I/O Description
可知，使用
Xmmc0DATA[0]...Xmmc0DATA[3]、
Xmmc1DATA[0]...Xmmc1DATA[3]接口
物理基地址：
0x12550000
eMMC分区
| 分区 | 分区类型 | 描述 |
|---|---|---|
| Boot Area Partition 1 | Boot Area Partitions | 此分区主要是为了支持从eMMC启动系统而设计的。 |
| Boot Area Partition 2 | Boot Area Partitions | |
| RPMB Partition | RPMB Partition | 它通过HMAC SHA-256 和Write Counter来保证保存在RPMB内部的数据不被非法篡改。在实际应用中，RPMB分区通常用来保存安全相关的数据，例如指纹数据、安全支付相关的密钥等。 |
| General Purpose Partition 1 | General Purpose Partitions | 此区域则主要用于存储系统或者用户数据。 |
| General Purpose Partition 2 | General Purpose Partitions | |
| General Purpose Partition 3 | General Purpose Partitions | |
| General Purpose Partition 4 | General Purpose Partitions | |
| User Data Area | User Data Area | 此区域则主要用于存储系统和用户数据。 |
移植
找到eMMC驱动目录：
drivers\mmc\host\dw_mmc-exynos.c，查看支持的设备列表：
static const struct of_device_id dw_mci_exynos_match[] = {
{ .compatible = "samsung,exynos4412-dw-mshc",
.data = &exynos_drv_data, },
{ .compatible = "samsung,exynos5250-dw-mshc",
.data = &exynos_drv_data, },
{ .compatible = "samsung,exynos5420-dw-mshc",
.data = &exynos_drv_data, },
{ .compatible = "samsung,exynos5420-dw-mshc-smu",
.data = &exynos_drv_data, },
{ .compatible = "samsung,exynos7-dw-mshc",
.data = &exynos_drv_data, },
{ .compatible = "samsung,exynos7-dw-mshc-smu",
.data = &exynos_drv_data, },
{},
};查看
exynos4412的
dtsi设备树
aliases {
pinctrl0 = &pinctrl_0;
pinctrl1 = &pinctrl_1;
pinctrl2 = &pinctrl_2;
pinctrl3 = &pinctrl_3;
fimc-lite0 = &fimc_lite_0;
fimc-lite1 = &fimc_lite_1;
mshc0 = &mshc_0;
};
mshc_0: mmc@12550000 {
compatible = "samsung,exynos4412-dw-mshc";
reg = <0x12550000 0x1000>;
interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>;
#address-cells = <1>;
#size-cells = <0>;
fifo-depth = <0x80>;
clocks = <&clock CLK_SDMMC4>, <&clock CLK_SCLK_MMC4>;
clock-names = "biu", "ciu";
status = "disabled";
};这里默认已经有一份
eMMC的设备树配置，我们需要在此基础上修改
参考其他
dts文件
.\arch\arm\boot\dts\exynos4412-origen.dts
&mshc_0 {
pinctrl-0 = <&sd4_clk &sd4_cmd &sd4_bus4 &sd4_bus8>;
pinctrl-names = "default";
status = "okay";
num-slots = <1>;
broken-cd;
card-detect-delay = <200>;
samsung,dw-mshc-ciu-div = <3>;
samsung,dw-mshc-sdr-timing = <2 3>;
samsung,dw-mshc-ddr-timing = <1 2>;
bus-width = <8>;
cap-mmc-highspeed;
};修改设备树
.\arch\arm\boot\dts\exynos4412-tiny4412.dts
&mshc_0 {
pinctrl-0 = <&sd4_clk &sd4_cmd &sd4_bus4 &sd4_bus8>;
pinctrl-names = "default";
status = "okay";
num-slots = <1>;
broken-cd;
card-detect-delay = <200>;
samsung,dw-mshc-ciu-div = <3>;
samsung,dw-mshc-sdr-timing = <2 3>;
samsung,dw-mshc-ddr-timing = <1 2>;
bus-width = <8>;
cap-mmc-highspeed;
};GIC_SPI
#define GIC_SPI 0 //共享中断 #define GIC_PPI 1 //每个处理器拥有独立中断
IRQ_TYPE_XX
#define IRQ_TYPE_NONE 0 //不触发 #define IRQ_TYPE_EDGE_RISING 1 //上升沿触发 #define IRQ_TYPE_EDGE_FALLING 2 //下降沿触发 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING) #define IRQ_TYPE_LEVEL_HIGH 4 //高电平触发 #define IRQ_TYPE_LEVEL_LOW 8 //低电平触发
中断源
9 Interrupt Controller 9.2 Interrupt Source 9.2.2 GIC Interrupt Table
| SPI Port No | Interrupt Source |
|---|---|
| 77 | 4000SDMMC |
| 76 | HSMMC3 |
| 75 | HSMMC2 |
| 74 | HSMMC1 |
| 73 | HSMMC0 |
eMMC使用
77号中断源
menuconfig
Device Drivers ---> <*> MMC/SD/SDIO card support ---> <*> MMC block device driver (NEW) <*> Synopsys DesignWare Memory Card Interface <*> Exynos specific extensions for Synopsys DW Memory Card Interface
测试
烧录程序... [ 3.185078] mmc_host mmc0: Bus speed (slot 0) = 50000000Hz (slot req 52000000Hz, actual 50000000HZ div = 0) [ 3.191021] of_get_named_gpiod_flags: parsed 'gpios' property of node '/gpio_keys/key1[0]' - status (0) [ 3.191043] gpio-238 (key1): gpiod_set_debounce: missing set() or set_config() operations [ 3.191134] of_get_named_gpiod_flags: parsed 'gpios' property of node '/gpio_keys/key2[0]' - status (0) [ 3.191145] gpio-239 (key2): gpiod_set_debounce: missing set() or set_config() operations [ 3.191193] of_get_named_gpiod_flags: parsed 'gpios' property of node '/gpio_keys/key3[0]' - status (0) [ 3.191203] gpio-240 (key3): gpiod_set_debounce: missing set() or set_config() operations [ 3.191245] of_get_named_gpiod_flags: parsed 'gpios' property of node '/gpio_keys/key4[0]' - status (0) [ 3.191254] gpio-241 (key4): gpiod_set_debounce: missing set() or set_config() operations [ 3.191458] input: gpio_keys as /devices/platform/gpio_keys/input/input3 [ 3.203805] s3c-rtc 10070000.rtc: setting system clock to 2000-01-01 01:37:07 UTC (946690627) [ 3.280062] mmc0: new DDR MMC card at address 0001 [ 3.285333] mmcblk0: mmc0:0001 4YMD3R 3.63 GiB [ 3.289236] mmcblk0boot0: mmc0:0001 4YMD3R partition 1 4.00 MiB [ 3.295151] mmcblk0boot1: mmc0:0001 4YMD3R partition 2 4.00 MiB [ 3.301136] mmcblk0rpmb: mmc0:0001 4YMD3R partition 3 512 KiB [ 3.307227] mmcblk0: p1 p2 p3 p4 Processing /etc/profile... Done
查看磁盘信息
[root@TINY4412:~]# fdisk -l Disk /dev/mmcblk0: 3712 MB, 3892314112 bytes, 7602176 sectors 118784 cylinders, 4 heads, 16 sectors/track Units: cylinders of 64 * 512 = 32768 bytes Device Boot StartCHS EndCHS StartLBA EndLBA Sectors Size Id Type /dev/mmcblk0p1 0,1,1 1023,3,16 16 195391 195376 95.3M b Win95 FAT32 /dev/mmcblk0p2 1023,3,16 1023,3,16 195392 2148607 1953216 953M 83 Linux /dev/mmcblk0p3 1023,3,16 1023,3,16 2148608 4101823 1953216 953M 83 Linux /dev/mmcblk0p4 1023,3,16 1023,3,16 4101824 7602175 3500352 1709M 83 Linux Disk /dev/mmcblk0boot1: 4 MB, 4194304 bytes, 8192 sectors 128 cylinders, 4 heads, 16 sectors/track Units: cylinders of 64 * 512 = 32768 bytes Disk /dev/mmcblk0boot1 doesn't contain a valid partition table Disk /dev/mmcblk0boot0: 4 MB, 4194304 bytes, 8192 sectors 128 cylinders, 4 heads, 16 sectors/track Units: cylinders of 64 * 512 = 32768 bytes Disk /dev/mmcblk0boot0 doesn't contain a valid partition table
查看设备
[root@TINY4412:~]# ls /dev/mmcblk0 mmcblk0 mmcblk0boot1 mmcblk0p2 mmcblk0p4 mmcblk0boot0 mmcblk0p1 mmcblk0p3 mmcblk0rpmb
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