drivers/usb/dwc2/hw.h
Source file repositories/reference/linux-study-clean/drivers/usb/dwc2/hw.h
File Facts
- System
- Linux kernel
- Corpus path
drivers/usb/dwc2/hw.h- Extension
.h- Size
- 30495 bytes
- Lines
- 890
- 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.
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
- No C-style include directives detected by the generator.
Detected Declarations
struct dwc2_dma_desc
Annotated Snippet
struct dwc2_dma_desc {
u32 status;
u32 buf;
} __packed;
/* Host Mode DMA descriptor status quadlet */
#define HOST_DMA_A BIT(31)
#define HOST_DMA_STS_MASK (0x3 << 28)
#define HOST_DMA_STS_SHIFT 28
#define HOST_DMA_STS_PKTERR BIT(28)
#define HOST_DMA_EOL BIT(26)
#define HOST_DMA_IOC BIT(25)
#define HOST_DMA_SUP BIT(24)
#define HOST_DMA_ALT_QTD BIT(23)
#define HOST_DMA_QTD_OFFSET_MASK (0x3f << 17)
#define HOST_DMA_QTD_OFFSET_SHIFT 17
#define HOST_DMA_ISOC_NBYTES_MASK (0xfff << 0)
#define HOST_DMA_ISOC_NBYTES_SHIFT 0
#define HOST_DMA_NBYTES_MASK (0x1ffff << 0)
#define HOST_DMA_NBYTES_SHIFT 0
#define HOST_DMA_NBYTES_LIMIT 131071
/* Device Mode DMA descriptor status quadlet */
#define DEV_DMA_BUFF_STS_MASK (0x3 << 30)
#define DEV_DMA_BUFF_STS_SHIFT 30
#define DEV_DMA_BUFF_STS_HREADY 0
#define DEV_DMA_BUFF_STS_DMABUSY 1
#define DEV_DMA_BUFF_STS_DMADONE 2
#define DEV_DMA_BUFF_STS_HBUSY 3
#define DEV_DMA_STS_MASK (0x3 << 28)
#define DEV_DMA_STS_SHIFT 28
#define DEV_DMA_STS_SUCC 0
#define DEV_DMA_STS_BUFF_FLUSH 1
#define DEV_DMA_STS_BUFF_ERR 3
#define DEV_DMA_L BIT(27)
#define DEV_DMA_SHORT BIT(26)
#define DEV_DMA_IOC BIT(25)
#define DEV_DMA_SR BIT(24)
#define DEV_DMA_MTRF BIT(23)
#define DEV_DMA_ISOC_PID_MASK (0x3 << 23)
#define DEV_DMA_ISOC_PID_SHIFT 23
#define DEV_DMA_ISOC_PID_DATA0 0
#define DEV_DMA_ISOC_PID_DATA2 1
#define DEV_DMA_ISOC_PID_DATA1 2
#define DEV_DMA_ISOC_PID_MDATA 3
#define DEV_DMA_ISOC_FRNUM_MASK (0x7ff << 12)
#define DEV_DMA_ISOC_FRNUM_SHIFT 12
#define DEV_DMA_ISOC_TX_NBYTES_MASK (0xfff << 0)
#define DEV_DMA_ISOC_TX_NBYTES_LIMIT 0xfff
#define DEV_DMA_ISOC_RX_NBYTES_MASK (0x7ff << 0)
#define DEV_DMA_ISOC_RX_NBYTES_LIMIT 0x7ff
#define DEV_DMA_ISOC_NBYTES_SHIFT 0
#define DEV_DMA_NBYTES_MASK (0xffff << 0)
#define DEV_DMA_NBYTES_SHIFT 0
#define DEV_DMA_NBYTES_LIMIT 0xffff
#define MAX_DMA_DESC_NUM_GENERIC 64
#define MAX_DMA_DESC_NUM_HS_ISOC 256
#endif /* __DWC2_HW_H__ */
Annotation
- Detected declarations: `struct dwc2_dma_desc`.
- Atlas domain: Driver Families / drivers/usb.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.