drivers/mmc/host/sdhci-tegra.c

Source file repositories/reference/linux-study-clean/drivers/mmc/host/sdhci-tegra.c

File Facts

System
Linux kernel
Corpus path
drivers/mmc/host/sdhci-tegra.c
Extension
.c
Size
57581 bytes
Lines
1934
Domain
Driver Families
Bucket
drivers/mmc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct sdhci_tegra_soc_data {
	const struct sdhci_pltfm_data *pdata;
	u64 dma_mask;
	u32 nvquirks;
	u8 min_tap_delay;
	u8 max_tap_delay;
};

/* Magic pull up and pull down pad calibration offsets */
struct sdhci_tegra_autocal_offsets {
	u32 pull_up_3v3;
	u32 pull_down_3v3;
	u32 pull_up_3v3_timeout;
	u32 pull_down_3v3_timeout;
	u32 pull_up_1v8;
	u32 pull_down_1v8;
	u32 pull_up_1v8_timeout;
	u32 pull_down_1v8_timeout;
	u32 pull_up_sdr104;
	u32 pull_down_sdr104;
	u32 pull_up_hs400;
	u32 pull_down_hs400;
};

struct sdhci_tegra {
	const struct sdhci_tegra_soc_data *soc_data;
	struct gpio_desc *power_gpio;
	struct clk *tmclk;
	bool ddr_signaling;
	bool pad_calib_required;
	bool pad_control_available;

	struct reset_control *rst;
	struct pinctrl *pinctrl_sdmmc;
	struct pinctrl_state *pinctrl_state_3v3;
	struct pinctrl_state *pinctrl_state_1v8;
	struct pinctrl_state *pinctrl_state_3v3_drv;
	struct pinctrl_state *pinctrl_state_1v8_drv;

	struct sdhci_tegra_autocal_offsets autocal_offsets;
	ktime_t last_calib;

	u32 default_tap;
	u32 default_trim;
	u32 dqs_trim;
	bool enable_hwcq;
	unsigned long curr_clk_rate;
	u8 tuned_tap_delay;
	u32 stream_id;
};

static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
	const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;

	if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) &&
			(reg == SDHCI_HOST_VERSION))) {
		/* Erratum: Version register is invalid in HW. */
		return SDHCI_SPEC_200;
	}

	return readw(host->ioaddr + reg);
}

static void tegra_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	switch (reg) {
	case SDHCI_TRANSFER_MODE:
		/*
		 * Postpone this write, we must do it together with a
		 * command write that is down below.
		 */
		pltfm_host->xfer_mode_shadow = val;
		return;
	case SDHCI_COMMAND:
		writel((val << 16) | pltfm_host->xfer_mode_shadow,
			host->ioaddr + SDHCI_TRANSFER_MODE);
		return;
	}

	writew(val, host->ioaddr + reg);
}

static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

Annotation

Implementation Notes