drivers/usb/chipidea/usbmisc_imx.c

Source file repositories/reference/linux-study-clean/drivers/usb/chipidea/usbmisc_imx.c

File Facts

System
Linux kernel
Corpus path
drivers/usb/chipidea/usbmisc_imx.c
Extension
.c
Size
42322 bytes
Lines
1556
Domain
Driver Families
Bucket
drivers/usb
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

struct usbmisc_ops {
	/* It's called once when probe a usb device */
	int (*init)(struct imx_usbmisc_data *data);
	/* It's called once after adding a usb device */
	int (*post)(struct imx_usbmisc_data *data);
	/* It's called when we need to enable/disable usb wakeup */
	int (*set_wakeup)(struct imx_usbmisc_data *data, bool enabled);
	/* It's called before setting portsc.suspendM */
	int (*hsic_set_connect)(struct imx_usbmisc_data *data);
	/* It's called during suspend/resume */
	int (*hsic_set_clk)(struct imx_usbmisc_data *data, bool enabled);
	/* usb charger detection */
	int (*charger_detection)(struct imx_usbmisc_data *data);
	/* It's called when system resume from usb power lost */
	int (*power_lost_check)(struct imx_usbmisc_data *data);
	/* It's called when device controller changed pullup status */
	void (*pullup)(struct imx_usbmisc_data *data, bool on);
	/* It's called during suspend/resume to save power */
	void (*vbus_comparator_on)(struct imx_usbmisc_data *data, bool on);
};

struct imx_usbmisc {
	void __iomem *base;
	void __iomem *blkctl;
	spinlock_t lock;
	const struct usbmisc_ops *ops;
};

static inline bool is_imx53_usbmisc(struct imx_usbmisc_data *data);

static int usbmisc_imx25_init(struct imx_usbmisc_data *data)
{
	struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
	unsigned long flags;
	u32 val = 0;

	if (data->index > 1)
		return -EINVAL;

	spin_lock_irqsave(&usbmisc->lock, flags);
	switch (data->index) {
	case 0:
		val = readl(usbmisc->base);
		val &= ~(MX25_OTG_SIC_MASK | MX25_OTG_PP_BIT);
		val |= (MX25_EHCI_INTERFACE_DIFF_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_OTG_SIC_SHIFT;
		val |= (MX25_OTG_PM_BIT | MX25_OTG_OCPOL_BIT);

		/*
		 * If the polarity is not configured assume active high for
		 * historical reasons.
		 */
		if (data->oc_pol_configured && data->oc_pol_active_low)
			val &= ~MX25_OTG_OCPOL_BIT;

		writel(val, usbmisc->base);
		break;
	case 1:
		val = readl(usbmisc->base);
		val &= ~(MX25_H1_SIC_MASK | MX25_H1_PP_BIT |  MX25_H1_IPPUE_UP_BIT);
		val |= (MX25_EHCI_INTERFACE_SINGLE_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_H1_SIC_SHIFT;
		val |= (MX25_H1_PM_BIT | MX25_H1_OCPOL_BIT | MX25_H1_TLL_BIT |
			MX25_H1_USBTE_BIT | MX25_H1_IPPUE_DOWN_BIT);

		/*
		 * If the polarity is not configured assume active high for
		 * historical reasons.
		 */
		if (data->oc_pol_configured && data->oc_pol_active_low)
			val &= ~MX25_H1_OCPOL_BIT;

		writel(val, usbmisc->base);

		break;
	}
	spin_unlock_irqrestore(&usbmisc->lock, flags);

	return 0;
}

static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
{
	struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
	void __iomem *reg;
	unsigned long flags;
	u32 val;

	if (data->index > 2)
		return -EINVAL;

	if (data->index)

Annotation

Implementation Notes