drivers/scsi/lpfc/lpfc_compat.h

Source file repositories/reference/linux-study-clean/drivers/scsi/lpfc/lpfc_compat.h

File Facts

System
Linux kernel
Corpus path
drivers/scsi/lpfc/lpfc_compat.h
Extension
.h
Size
3253 bytes
Lines
99
Domain
Driver Families
Bucket
drivers/scsi
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

Note: HBA's SLI memory contains little-endian LW.
Thus to access it from a little-endian host,
memcpy_toio() and memcpy_fromio() can be used.
However on a big-endian host, copy 4 bytes at a time,
using writel() and readl().
 *******************************************************************/
#include <asm/byteorder.h>

#ifdef __BIG_ENDIAN

static inline void
lpfc_memcpy_to_slim(void __iomem *dest, void *src, unsigned int bytes)
{
	uint32_t __iomem *dest32;
	uint32_t *src32;
	unsigned int four_bytes;


	dest32  = (uint32_t __iomem *) dest;
	src32  = (uint32_t *) src;

	/* write input bytes, 4 bytes at a time */
	for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
		writel( *src32, dest32);
		readl(dest32); /* flush */
		dest32++;
		src32++;
	}

	return;
}

static inline void
lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
{
	uint32_t *dest32;
	uint32_t __iomem *src32;
	unsigned int four_bytes;


	dest32  = (uint32_t *) dest;
	src32  = (uint32_t __iomem *) src;

	/* read input bytes, 4 bytes at a time */
	for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
		*dest32 = readl( src32);
		dest32++;
		src32++;
	}

	return;
}

#else

static inline void
lpfc_memcpy_to_slim( void __iomem *dest, void *src, unsigned int bytes)
{
	/* convert bytes in argument list to word count for copy function */
	__iowrite32_copy(dest, src, bytes / sizeof(uint32_t));
}

static inline void
lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
{
	/* actually returns 1 byte past dest */
	memcpy_fromio( dest, src, bytes);
}

#endif	/* __BIG_ENDIAN */

Annotation

Implementation Notes