drivers/mmc/host/sdhci-uhs2.c

Source file repositories/reference/linux-study-clean/drivers/mmc/host/sdhci-uhs2.c

File Facts

System
Linux kernel
Corpus path
drivers/mmc/host/sdhci-uhs2.c
Extension
.c
Size
35119 bytes
Lines
1241
Domain
Driver Families
Bucket
drivers/mmc
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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

if (ios->power_mode == MMC_POWER_OFF) {
			mmc_opt_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
			mmc_regulator_set_vqmmc2(mmc, ios);
		}
		return -1;
	}

	sdhci_set_ios_common(mmc, ios);

	__sdhci_uhs2_set_ios(mmc, ios);

	return 0;
}

static int sdhci_uhs2_interface_detect(struct sdhci_host *host)
{
	u32 val;

	if (read_poll_timeout(sdhci_readl, val, (val & SDHCI_UHS2_IF_DETECT),
			      100, UHS2_INTERFACE_DETECT_TIMEOUT_100MS, true,
			      host, SDHCI_PRESENT_STATE)) {
		pr_debug("%s: not detect UHS2 interface in 100ms.\n", mmc_hostname(host->mmc));
		sdhci_dbg_dumpregs(host, "UHS2 interface detect timeout in 100ms");
		return -EIO;
	}

	/* Enable UHS2 error interrupts */
	sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_ALL_MASK, SDHCI_UHS2_INT_ERROR_MASK);

	if (read_poll_timeout(sdhci_readl, val, (val & SDHCI_UHS2_LANE_SYNC),
			      100, UHS2_LANE_SYNC_TIMEOUT_150MS, true, host, SDHCI_PRESENT_STATE)) {
		pr_debug("%s: UHS2 Lane sync fail in 150ms.\n", mmc_hostname(host->mmc));
		sdhci_dbg_dumpregs(host, "UHS2 Lane sync fail in 150ms");
		return -EIO;
	}

	DBG("%s: UHS2 Lane synchronized in UHS2 mode, PHY is initialized.\n",
	    mmc_hostname(host->mmc));
	return 0;
}

static int sdhci_uhs2_init(struct sdhci_host *host)
{
	u16 caps_ptr = 0;
	u32 caps_gen = 0;
	u32 caps_phy = 0;
	u32 caps_tran[2] = {0, 0};
	struct mmc_host *mmc = host->mmc;

	caps_ptr = sdhci_readw(host, SDHCI_UHS2_CAPS_PTR);
	if (caps_ptr < 0x100 || caps_ptr > 0x1FF) {
		pr_err("%s: SDHCI_UHS2_CAPS_PTR(%d) is wrong.\n",
		       mmc_hostname(mmc), caps_ptr);
		return -ENODEV;
	}
	caps_gen = sdhci_readl(host, caps_ptr + SDHCI_UHS2_CAPS_OFFSET);
	caps_phy = sdhci_readl(host, caps_ptr + SDHCI_UHS2_CAPS_PHY_OFFSET);
	caps_tran[0] = sdhci_readl(host, caps_ptr + SDHCI_UHS2_CAPS_TRAN_OFFSET);
	caps_tran[1] = sdhci_readl(host, caps_ptr + SDHCI_UHS2_CAPS_TRAN_1_OFFSET);

	/* General Caps */
	mmc->uhs2_caps.dap = caps_gen & SDHCI_UHS2_CAPS_DAP_MASK;
	mmc->uhs2_caps.gap = FIELD_GET(SDHCI_UHS2_CAPS_GAP_MASK, caps_gen);
	mmc->uhs2_caps.n_lanes = FIELD_GET(SDHCI_UHS2_CAPS_LANE_MASK, caps_gen);
	mmc->uhs2_caps.addr64 =	(caps_gen & SDHCI_UHS2_CAPS_ADDR_64) ? 1 : 0;
	mmc->uhs2_caps.card_type = FIELD_GET(SDHCI_UHS2_CAPS_DEV_TYPE_MASK, caps_gen);

	/* PHY Caps */
	mmc->uhs2_caps.phy_rev = caps_phy & SDHCI_UHS2_CAPS_PHY_REV_MASK;
	mmc->uhs2_caps.speed_range = FIELD_GET(SDHCI_UHS2_CAPS_PHY_RANGE_MASK, caps_phy);
	mmc->uhs2_caps.n_lss_sync = FIELD_GET(SDHCI_UHS2_CAPS_PHY_N_LSS_SYN_MASK, caps_phy);
	mmc->uhs2_caps.n_lss_dir = FIELD_GET(SDHCI_UHS2_CAPS_PHY_N_LSS_DIR_MASK, caps_phy);
	if (mmc->uhs2_caps.n_lss_sync == 0)
		mmc->uhs2_caps.n_lss_sync = 16 << 2;
	else
		mmc->uhs2_caps.n_lss_sync <<= 2;
	if (mmc->uhs2_caps.n_lss_dir == 0)
		mmc->uhs2_caps.n_lss_dir = 16 << 3;
	else
		mmc->uhs2_caps.n_lss_dir <<= 3;

	/* LINK/TRAN Caps */
	mmc->uhs2_caps.link_rev = caps_tran[0] & SDHCI_UHS2_CAPS_TRAN_LINK_REV_MASK;
	mmc->uhs2_caps.n_fcu = FIELD_GET(SDHCI_UHS2_CAPS_TRAN_N_FCU_MASK, caps_tran[0]);
	if (mmc->uhs2_caps.n_fcu == 0)
		mmc->uhs2_caps.n_fcu = 256;
	mmc->uhs2_caps.host_type = FIELD_GET(SDHCI_UHS2_CAPS_TRAN_HOST_TYPE_MASK, caps_tran[0]);
	mmc->uhs2_caps.maxblk_len = FIELD_GET(SDHCI_UHS2_CAPS_TRAN_BLK_LEN_MASK, caps_tran[0]);
	mmc->uhs2_caps.n_data_gap = caps_tran[1] & SDHCI_UHS2_CAPS_TRAN_1_N_DATA_GAP_MASK;

Annotation

Implementation Notes