drivers/usb/mtu3/mtu3.h

Source file repositories/reference/linux-study-clean/drivers/usb/mtu3/mtu3.h

File Facts

System
Linux kernel
Corpus path
drivers/usb/mtu3/mtu3.h
Extension
.h
Size
13231 bytes
Lines
450
Domain
Driver Families
Bucket
drivers/usb
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 mtu3_fifo_info {
	u32 base;
	u32 limit;
	DECLARE_BITMAP(bitmap, MTU3_FIFO_BIT_SIZE);
};

/**
 * struct qmu_gpd - General Purpose Descriptor (GPD):
 *	The format of TX GPD is a little different from RX one.
 *	And the size of GPD is 16 bytes.
 *
 * @dw0_info:
 *	bit0: Hardware Own (HWO)
 *	bit1: Buffer Descriptor Present (BDP), always 0, BD is not supported
 *	bit2: Bypass (BPS), 1: HW skips this GPD if HWO = 1
 *	bit6: [EL] Zero Length Packet (ZLP), moved from @dw3_info[29]
 *	bit7: Interrupt On Completion (IOC)
 *	bit[31:16]: ([EL] bit[31:12]) allow data buffer length (RX ONLY),
 *		the buffer length of the data to receive
 *	bit[23:16]: ([EL] bit[31:24]) extension address (TX ONLY),
 *		lower 4 bits are extension bits of @buffer,
 *		upper 4 bits are extension bits of @next_gpd
 * @next_gpd: Physical address of the next GPD
 * @buffer: Physical address of the data buffer
 * @dw3_info:
 *	bit[15:0]: ([EL] bit[19:0]) data buffer length,
 *		(TX): the buffer length of the data to transmit
 *		(RX): The total length of data received
 *	bit[23:16]: ([EL] bit[31:24]) extension address (RX ONLY),
 *		lower 4 bits are extension bits of @buffer,
 *		upper 4 bits are extension bits of @next_gpd
 *	bit29: ([EL] abandoned) Zero Length Packet (ZLP) (TX ONLY)
 */
struct qmu_gpd {
	__le32 dw0_info;
	__le32 next_gpd;
	__le32 buffer;
	__le32 dw3_info;
} __packed;

/**
* struct mtu3_gpd_ring - GPD ring descriptor
* @dma: physical base address of GPD segment
* @start: virtual base address of GPD segment
* @end: the last GPD element
* @enqueue: the first empty GPD to use
* @dequeue: the first completed GPD serviced by ISR
*
* NOTE: the size of GPD ring should be >= 2
*/
struct mtu3_gpd_ring {
	dma_addr_t dma;
	struct qmu_gpd *start;
	struct qmu_gpd *end;
	struct qmu_gpd *enqueue;
	struct qmu_gpd *dequeue;
};

/**
* struct otg_switch_mtk - OTG/dual-role switch management
* @vbus: vbus 5V used by host mode
* @edev: external connector used to detect vbus and iddig changes
* @id_nb : notifier for iddig(idpin) detection
* @dr_work : work for drd mode switch, used to avoid sleep in atomic context
* @desired_role : role desired to switch
* @default_role : default mode while usb role is USB_ROLE_NONE
* @role_sw : use USB Role Switch to support dual-role switch, can't use
*		extcon at the same time, and extcon is deprecated.
* @role_sw_used : true when the USB Role Switch is used.
* @is_u3_drd: whether port0 supports usb3.0 dual-role device or not
* @manual_drd_enabled: it's true when supports dual-role device by debugfs
*		to switch host/device modes depending on user input.
*/
struct otg_switch_mtk {
	struct regulator *vbus;
	struct extcon_dev *edev;
	struct notifier_block id_nb;
	struct work_struct dr_work;
	enum usb_role desired_role;
	enum usb_role default_role;
	struct usb_role_switch *role_sw;
	bool role_sw_used;
	bool is_u3_drd;
	bool manual_drd_enabled;
};

/**
 * struct ssusb_mtk - SuperSpeed USB descriptor (MTK)
 * @mac_base: register base address of device MAC, exclude xHCI's
 * @ippc_base: register base address of IP Power and Clock interface (IPPC)

Annotation

Implementation Notes