目录
SD卡无法识别问题定位
设备树确认mmc1 启用
驱动文件 sdhci-ss524v100.c 寄存器以及值的定义
probe函数匹配
通过函数的层层打印，sd卡寄存器读取出来时没有插上的状态
SD卡无法识别问题定位
硬件平台：ss524处理器，
内核版本:4.19.90
设备树确认mmc1 启用
mmc1: SD@0x10020000 {
compatible = "vendor,sdhci";
reg = <0x10020000 0x1000>;
interrupts = <GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clock SS524V100_MMC0_CLK>;
clock-names = "mmc_clk";
resets = <&clock 0x34c0 16>, <&clock 0x34c4 1>;
reset-names = "crg_reset", "dll_reset";
max-frequency = <50000000>;
crg_regmap = <&clock>;
iocfg_regmap = <&iocfg_ctrl>;
bus-width = <4>;
cap-sd-highspeed;
disable-wp;
no-sdio;
devid = <1>;
status = "disabled";
};
&mmc1 {
status = "okay";
};
驱动文件 sdhci-ss524v100.c 寄存器以及值的定义
#include "sdhci-bsp.h"
#include "mci_proc.h"
#define PERI_CRG_MMC_DRV_DLL 0x34c8
#define CRG_DRV_PHASE_SEL_SHIFT 15
#define CRG_DRV_PHASE_SEL_MASK (0x1F << 15)
#define PERI_CRG_MMC_STAT 0x34d8
#define CRG_SAM_DLL_READY BIT(12)
#define CRG_DS_DLL_READY BIT(10)
#define CRG_P4_DLL_LOCKED BIT(9)
/* MMC IO */
#define REG_MMC_CLK_IO 0xc8
#define REG_MMC_CMD_IO 0xcc
#define REG_MMC_D0_IO 0xd0
#define REG_MMC_D1_IO 0xd4
#define REG_MMC_D2_IO 0xd8
#define REG_MMC_D3_IO 0xdc
#define REG_MMC_D4_IO 0xec
#define REG_MMC_D6_IO 0xf0
#define REG_MMC_D5_IO 0xe0
#define REG_MMC_D7_IO 0xe4
#define REG_MMC_DQS_IO 0xf4
#define REG_MMC_RST_IO 0xc4
#define REG_SD_PWR_EN_IO 0xc4
#define REG_SD_DETECT_IO 0xfc
/* IO CFG */
#define IO_CFG_DRV_STR_MASK (0xf << 4)
#define io_cfg_drv_str_sel(str) ((str) << 4)
#define IO_CFG_PULL_UP BIT(8)
#define IO_CFG_PULL_DOWN BIT(9)
#define IO_CFG_SR BIT(10)
#define IO_CFG_SDIO_MASK (IO_CFG_DRV_STR_MASK | IO_CFG_PULL_UP | \
IO_CFG_PULL_DOWN | IO_CFG_SR)
#define IO_CFG_SDIO_MUX 0x2
#define IO_CFG_EMMC_MUX 0x1
#define IO_CFG_MUX_MASK 0xF
#define MMC_BUS_WIDTH_8_BIT 8
#define MMC_BUS_WIDTH_4_BIT 4
#define REG_SYSSTAT 0x11020018
#define BOOT_MEDIA_NAND BIT(2)
#define EMMC_BOOT_8BIT BIT(11)
#define BOOT_FLAG_MASK (0x3 << 2)
sdhci_bsp_parse_dt
//pin mux set
bsp_mmc_io_mux_config
sdhci_bsp_pltfm_init
sdhci_bsp_set_clock
int sdhci_bsp_parse_dt(struct sdhci_host *host)
{
struct sdhci_bsp_priv *priv = sdhci_get_pltfm_priv(host);
struct device_node *np = host->mmc->parent->of_node;
u32 bus_width;
int ret;
ret = mmc_of_parse(host->mmc);
if (ret)
return ret;
#ifdef CONFIG_MMC_CQHCI
if (of_get_property(np, "mmc-cmd-queue", NULL))
host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
#endif
if (of_get_property(np, "mmc-broken-cmd23", NULL))
host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
if (of_property_read_u32(np, "bus-width", &bus_width) == 0) {
priv->bus_width = bus_width;
} else {
pr_err("%s: \"bus-width\" property is missing, assuming 1 bit.\n",
mmc_hostname(host->mmc));
priv->bus_width = 1;
}
if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
(priv->bus_width == 1)) {
priv->bus_width = 1;
host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
}
return 0;
}
static const struct of_device_id sdhci_bsp_match[] = {
{ .compatible = "vendor,sdhci" },
{},
};
MODULE_DEVICE_TABLE(of, sdhci_bsp_match);
static struct sdhci_ops sdhci_bsp_ops = {
.platform_execute_tuning = sdhci_bsp_execute_tuning,
.reset = sdhci_reset,
.set_clock = sdhci_bsp_set_clock,
.set_bus_width = sdhci_set_bus_width,
.set_uhs_signaling = sdhci_bsp_set_uhs_signaling,
.hw_reset = sdhci_bsp_hw_reset,
#if defined(CONFIG_ARCH_SS318V100) || defined(CONFIG_ARCH_SS919V100) || \
defined(CONFIG_ARCH_SS918V100) || defined(CONFIG_ARCH_SS015V100) || \
defined(CONFIG_ARCH_SS013V100) || defined(CONFIG_ARCH_SS928V100) || \
defined(CONFIG_ARCH_SS000V100)
.start_signal_voltage_switch = sdhci_bsp_start_signal_voltage_switch,
#endif
.init = sdhci_bsp_extra_init,
};
static const struct sdhci_pltfm_data sdhci_bsp_pdata = {
.ops = &sdhci_bsp_ops,
.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
};
probe函数匹配
static int sdhci_bsp_probe(struct platform_device *pdev)
{
struct sdhci_host *host = NULL;
const struct sdhci_pltfm_data *pdata = NULL;
int ret;
#ifdef CONFIG_MMC_CQHCI
if (of_get_property(pdev->dev.of_node, "mmc-cmd-queue", NULL))
pdata = &sdhci_bsp_cqe_pdata;
else
pdata = &sdhci_bsp_pdata;
#else
pdata = &sdhci_bsp_pdata;
#endif
host = sdhci_pltfm_init(pdev, pdata, sizeof(struct sdhci_bsp_priv));
if (IS_ERR(host))
return PTR_ERR(host);
ret = sdhci_bsp_pltfm_init(pdev, host);
if (ret)
goto pltfm_free;
if (bsp_support_runtime_pm(host)) {
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, BSP_MMC_AUTOSUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
}
ret = sdhci_bsp_add_host(host);
if (ret)
goto pm_runtime_disable;
if (bsp_support_runtime_pm(host)) {
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
}
return 0;
pm_runtime_disable:
if (bsp_support_runtime_pm(host)) {
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
}
pltfm_free:
sdhci_pltfm_free(pdev);
return ret;
}
通过函数的层层打印，sd卡寄存器读取出来时没有插上的状态
static int sdhci_get_cd(struct mmc_host *mmc)
{
struct sdhci_host *host = mmc_priv(mmc);
int gpio_cd = mmc_gpio_get_cd(mmc);
if (host->flags & SDHCI_DEVICE_DEAD)
return 0;
/* If nonremovable, assume that the card is always present. */
if (!mmc_card_is_removable(host->mmc))
return 1;
/*
* Try slot gpio detect, if defined it take precedence
* over build in controller functionality
*/
if (gpio_cd >= 0)
return !!gpio_cd;
/* If polling, assume that the card is always present. */
if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
return 1;
/* Host native card detect */
return 1;//!!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
}
最终问题是，SD卡检测引脚硬件的选择与软件的配置不是同一个引脚。
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