IMX6UL eMMC初始化流程

环境

在uboot中分析emmc初始化流程代码，emmc在uboot中方便添加命令和打印调试，uboot版本：2017.03

开机打印

uboot启动打印

 U-Boot 2017.03-g101318f (Jan 09 2019 - 17:37:10 +0800)CPU:   Freescale i.MX6UL rev1.2 696 MHz (running at 396 MHz)CPU:   Automotive temperature grade (-40C to 125C) at 58CReset cause: WDOGModel: Freescale i.MX6 UltraLite 14x14 EVK BoardBoard: MX6UL 14x14 EVKDRAM:  256 MiBSF: Detected n25q256 with page size 256 Bytes, erase size 4 KiB, total 32 MiBHardware version: 0x0401MMC:   board_mmc_initCONFIG_MX6UL_14X14_EVK_EMMC_REWORKFSL_SDHC: 0Using default environmentSF: Detected n25q256 with page size 256 Bytes, erase size 4 KiB, total 32 MiBIn:    serialOut:   serialErr:   serialSF: Detected n25q256 with page size 256 Bytes, erase size 4 KiB, total 32 MiBNet:   eth1: ethernet@020b4000, eth0: ethernet@02188000 [PRIME]Normal BootHit any key to stop autoboot:  0

内核启动打印

 mmc1: new DDR MMC card at address 0001mmcblk1: mmc1:0001 P1XXXX 7.20 GiB mmcblk1boot0: mmc1:0001 P1XXXX partition 1 16.0 MiBmmcblk1boot1: mmc1:0001 P1XXXX partition 2 16.0 MiBmmcblk1rpmb: mmc1:0001 P1XXXX partition 3 128 KiBmmcblk1: p1 p2

启动参数

 => pribaudrate=115200board_name=EVKboard_rev=14X14boot_fdt=trybootcmd=run kernel_env;if test ${default_image} = system1; then echo Booting from ${default_image}......;sf probe 0; sf read ${itb_addr} 0x90000 0xF30000; bootm ${itb_addr}; fi;if test ${default_image} = system2; then echo Booting from ${default_image}......;sf probe 0; sf read ${itb_addr} 0xFC0000 0xF30000; bootm ${itb_addr}; fi; bootdelay=1console=ttymxc0default_image=system1eth1addr=08:ed:02:37:10:02ethact=ethernet@02188000ethaddr=08:ed:03:37:10:02ethprime=eth0fdt_addr=0x83000000fdt_file=undefinedfdt_high=0xfffffffffdtcontroladdr=8ef58068initrd_high=0xffffffffip_dyn=yesitb_addr=0x86800000kernel_env=setenv bootargs initrd=0x84800000,0x2000000 init=/etc/preinit console=${console},115200 root=/dev/ram0 ro rootfstype=ext4 image=${default_image} cma=64M mtdparts=21e0000.qspi:512k(uboot),64k(boardcfg),15552k(system1),15552k(system2),1024k(rootfs_data),60k(crashlog),4k(flags)loadaddr=0x80800000

EMMC信息

 => mmcinfo Device: FSL_SDHCManufacturer ID: feOEM: 14eName: P1XXX Tran Speed: 52000000Rd Block Len: 512MMC version 4.5High Capacity: YesCapacity: 7.2 GiBBus Width: 8-bitErase Group Size: 512 KiBHC WP Group Size: 8 MiBUser Capacity: 7.2 GiBBoot Capacity: 16 MiB ENHRPMB Capacity: 128 KiB ENH

EMMC初始化代码分析

emmc初始化函数

 struct mmc *mmc;        定义一个结构体指针mmc = init_mmc_device(curr_device, false);struct mmc *mmc;    定义一个结构体指针mmc = find_mmc_device(dev);   返回一个全局静态结构体地址：static struct mmc mmc_static;return &mmc_static;mmc_init(mmc)return mmc;mmc_init(struct mmc *mmc)  mmc_start_init(mmc);mmc_power_init(mmc);mmc->ddr_mode = 0;mmc_set_bus_width(mmc, 1);mmc_set_clock(mmc, 1);/* Reset the Card */err = mmc_go_idle(mmc);struct mmc_cmd cmd;#define MMC_CMD_GO_IDLE_STATE      0cmd.cmdidx = MMC_CMD_GO_IDLE_STATE;cmd.cmdarg = 0;cmd.resp_type = MMC_RSP_NONE;err = mmc_send_cmd(mmc, &cmd, NULL);mmc->cfg->ops->send_cmd(mmc, cmd, data);

probe探测函数，文件fsl_esdhc.c，赋值操作函数指针。

 static const struct mmc_ops esdhc_ops = {.send_cmd = esdhc_send_cmd,.set_ios  = esdhc_set_ios,.init      = esdhc_init,.getcd        = esdhc_getcd,};   static const struct udevice_id fsl_esdhc_ids[] = {{ .compatible = "fsl,imx6ul-usdhc", },    fsl_esdhc_probefsl_esdhc_init(priv);struct mmc *mmc;memset(&priv->cfg, 0, sizeof(priv->cfg));priv->cfg.name = "FSL_SDHC";priv->cfg.ops = &esdhc_ops;【怎么与mmc里面的mmc->cfg->ops对应？见下面】mmc = mmc_create(&priv->cfg, priv);struct mmc *mmc = &mmc_static;mmc->cfg = cfg;    等同于mmc->cfg = priv->cfgmmc->priv = priv;return mmc;              priv->mmc = mmc;

dts表配置

 arch/arm/dts/imx6ul.dtsi    usdhc2: usdhc@02194000 {compatible = "fsl,imx6ul-usdhc", "fsl,imx6sx-usdhc";reg = <0x02194000 0x4000>;interrupts = <GIC_SPI 23 IRQ_TYPE_LEVEL_HIGH>;clocks = <&clks IMX6UL_CLK_USDHC2>,<&clks IMX6UL_CLK_USDHC2>,<&clks IMX6UL_CLK_USDHC2>;clock-names = "ipg", "ahb", "per";bus-width = <4>;status = "disabled";};arch/arm/dts/imx6ul-14x14-evk.dts    &usdhc2 {pinctrl-names = "default";pinctrl-0 = <&pinctrl_usdhc2_8bit>;bus-width = <8>;non-removable;status = "okay";};

uboot启动到emmc初始化流程

common/board_r.c#ifdef CONFIG_GENERIC_MMCstatic int initr_mmc(void){puts("MMC:   ");mmc_initialize(gd->bd);return 0;}#endif drivers/mmc/mmc.cmmc_initializemmc_probe(bis);board_mmc_init(bis)cpu_mmc_init(bis);fsl_esdhc_mmc_init   mmc_do_preinit();struct mmc *m = &mmc_static;mmc_start_init(m);board/freescale/mx6ul_14x14_evk/mx6ul_14x14_evk.cboard_mmc_initprintf("board_mmc_init\n");fsl_esdhc_initialize(bis, &usdhc_cfg[i]);drivers/mmc/fsl_esdhc.c        fsl_esdhc_initialize    fsl_esdhc_init(priv)fsl_esdhc_mmc_init  fsl_esdhc_initialize

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IMX6UL eMMC初始化流程

环境

开机打印

EMMC初始化代码分析

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