include/linux/usb/ehci_def.h

Source file repositories/reference/linux-study-clean/include/linux/usb/ehci_def.h

File Facts

System
Linux kernel
Corpus path
include/linux/usb/ehci_def.h
Extension
.h
Size
7577 bytes
Lines
192
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ehci_caps {
	/* these fields are specified as 8 and 16 bit registers,
	 * but some hosts can't perform 8 or 16 bit PCI accesses.
	 * some hosts treat caplength and hciversion as parts of a 32-bit
	 * register, others treat them as two separate registers, this
	 * affects the memory map for big endian controllers.
	 */
	u32		hc_capbase;
#define HC_LENGTH(ehci, p)	(0x00ff&((p) >> /* bits 7:0 / offset 00h */ \
				(ehci_big_endian_capbase(ehci) ? 24 : 0)))
#define HC_VERSION(ehci, p)	(0xffff&((p) >> /* bits 31:16 / offset 02h */ \
				(ehci_big_endian_capbase(ehci) ? 0 : 16)))
	u32		hcs_params;     /* HCSPARAMS - offset 0x4 */
#define HCS_DEBUG_PORT(p)	(((p)>>20)&0xf)	/* bits 23:20, debug port? */
#define HCS_INDICATOR(p)	((p)&(1 << 16))	/* true: has port indicators */
#define HCS_N_CC(p)		(((p)>>12)&0xf)	/* bits 15:12, #companion HCs */
#define HCS_N_PCC(p)		(((p)>>8)&0xf)	/* bits 11:8, ports per CC */
#define HCS_PORTROUTED(p)	((p)&(1 << 7))	/* true: port routing */
#define HCS_PPC(p)		((p)&(1 << 4))	/* true: port power control */
#define HCS_N_PORTS(p)		(((p)>>0)&0xf)	/* bits 3:0, ports on HC */
#define HCS_N_PORTS_MAX		15		/* N_PORTS valid 0x1-0xF */

	u32		hcc_params;      /* HCCPARAMS - offset 0x8 */
/* EHCI 1.1 addendum */
#define HCC_32FRAME_PERIODIC_LIST(p)	((p)&(1 << 19))
#define HCC_PER_PORT_CHANGE_EVENT(p)	((p)&(1 << 18))
#define HCC_LPM(p)			((p)&(1 << 17))
#define HCC_HW_PREFETCH(p)		((p)&(1 << 16))

#define HCC_EXT_CAPS(p)		(((p)>>8)&0xff)	/* for pci extended caps */
#define HCC_ISOC_CACHE(p)       ((p)&(1 << 7))  /* true: can cache isoc frame */
#define HCC_ISOC_THRES(p)       (((p)>>4)&0x7)  /* bits 6:4, uframes cached */
#define HCC_CANPARK(p)		((p)&(1 << 2))  /* true: can park on async qh */
#define HCC_PGM_FRAMELISTLEN(p) ((p)&(1 << 1))  /* true: periodic_size changes*/
#define HCC_64BIT_ADDR(p)       ((p)&(1))       /* true: can use 64-bit addr */
	u8		portroute[8];	 /* nibbles for routing - offset 0xC */
};


/* Section 2.3 Host Controller Operational Registers */
struct ehci_regs {

	/* USBCMD: offset 0x00 */
	u32		command;

/* EHCI 1.1 addendum */
#define CMD_HIRD	(0xf<<24)	/* host initiated resume duration */
#define CMD_PPCEE	(1<<15)		/* per port change event enable */
#define CMD_FSP		(1<<14)		/* fully synchronized prefetch */
#define CMD_ASPE	(1<<13)		/* async schedule prefetch enable */
#define CMD_PSPE	(1<<12)		/* periodic schedule prefetch enable */
/* 23:16 is r/w intr rate, in microframes; default "8" == 1/msec */
#define CMD_PARK	(1<<11)		/* enable "park" on async qh */
#define CMD_PARK_CNT(c)	(((c)>>8)&3)	/* how many transfers to park for */
#define CMD_LRESET	(1<<7)		/* partial reset (no ports, etc) */
#define CMD_IAAD	(1<<6)		/* "doorbell" interrupt async advance */
#define CMD_ASE		(1<<5)		/* async schedule enable */
#define CMD_PSE		(1<<4)		/* periodic schedule enable */
/* 3:2 is periodic frame list size */
#define CMD_RESET	(1<<1)		/* reset HC not bus */
#define CMD_RUN		(1<<0)		/* start/stop HC */

	/* USBSTS: offset 0x04 */
	u32		status;
#define STS_PPCE_MASK	(0xff<<16)	/* Per-Port change event 1-16 */
#define STS_ASS		(1<<15)		/* Async Schedule Status */
#define STS_PSS		(1<<14)		/* Periodic Schedule Status */
#define STS_RECL	(1<<13)		/* Reclamation */
#define STS_HALT	(1<<12)		/* Not running (any reason) */
/* some bits reserved */
	/* these STS_* flags are also intr_enable bits (USBINTR) */
#define STS_IAA		(1<<5)		/* Interrupted on async advance */
#define STS_FATAL	(1<<4)		/* such as some PCI access errors */
#define STS_FLR		(1<<3)		/* frame list rolled over */
#define STS_PCD		(1<<2)		/* port change detect */
#define STS_ERR		(1<<1)		/* "error" completion (overflow, ...) */
#define STS_INT		(1<<0)		/* "normal" completion (short, ...) */

	/* USBINTR: offset 0x08 */
	u32		intr_enable;

	/* FRINDEX: offset 0x0C */
	u32		frame_index;	/* current microframe number */
	/* CTRLDSSEGMENT: offset 0x10 */
	u32		segment;	/* address bits 63:32 if needed */
	/* PERIODICLISTBASE: offset 0x14 */
	u32		frame_list;	/* points to periodic list */
	/* ASYNCLISTADDR: offset 0x18 */
	u32		async_next;	/* address of next async queue head */

Annotation

Implementation Notes