129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
/*
|
|
* linux/drivers/acorn/scsi/scsi.h
|
|
*
|
|
* Copyright (C) 2002 Russell King
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Commonly used scsi driver functions.
|
|
*/
|
|
|
|
#include <linux/scatterlist.h>
|
|
|
|
#define BELT_AND_BRACES
|
|
|
|
/*
|
|
* The scatter-gather list handling. This contains all
|
|
* the yucky stuff that needs to be fixed properly.
|
|
*/
|
|
|
|
/*
|
|
* copy_SCp_to_sg() Assumes contiguous allocation at @sg of at-most @max
|
|
* entries of uninitialized memory. SCp is from scsi-ml and has a valid
|
|
* (possibly chained) sg-list
|
|
*/
|
|
static inline int copy_SCp_to_sg(struct scatterlist *sg, struct scsi_pointer *SCp, int max)
|
|
{
|
|
int bufs = SCp->buffers_residual;
|
|
|
|
/* FIXME: It should be easy for drivers to loop on copy_SCp_to_sg().
|
|
* and to remove this BUG_ON. Use min() in-its-place
|
|
*/
|
|
BUG_ON(bufs + 1 > max);
|
|
|
|
sg_set_buf(sg, SCp->ptr, SCp->this_residual);
|
|
|
|
if (bufs) {
|
|
struct scatterlist *src_sg;
|
|
unsigned i;
|
|
|
|
for_each_sg(sg_next(SCp->buffer), src_sg, bufs, i)
|
|
*(++sg) = *src_sg;
|
|
sg_mark_end(sg);
|
|
}
|
|
|
|
return bufs + 1;
|
|
}
|
|
|
|
static inline int next_SCp(struct scsi_pointer *SCp)
|
|
{
|
|
int ret = SCp->buffers_residual;
|
|
if (ret) {
|
|
SCp->buffer = sg_next(SCp->buffer);
|
|
SCp->buffers_residual--;
|
|
SCp->ptr = sg_virt(SCp->buffer);
|
|
SCp->this_residual = SCp->buffer->length;
|
|
} else {
|
|
SCp->ptr = NULL;
|
|
SCp->this_residual = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static inline unsigned char get_next_SCp_byte(struct scsi_pointer *SCp)
|
|
{
|
|
char c = *SCp->ptr;
|
|
|
|
SCp->ptr += 1;
|
|
SCp->this_residual -= 1;
|
|
|
|
return c;
|
|
}
|
|
|
|
static inline void put_next_SCp_byte(struct scsi_pointer *SCp, unsigned char c)
|
|
{
|
|
*SCp->ptr = c;
|
|
SCp->ptr += 1;
|
|
SCp->this_residual -= 1;
|
|
}
|
|
|
|
static inline void init_SCp(struct scsi_cmnd *SCpnt)
|
|
{
|
|
memset(&SCpnt->SCp, 0, sizeof(struct scsi_pointer));
|
|
|
|
if (scsi_bufflen(SCpnt)) {
|
|
unsigned long len = 0;
|
|
|
|
SCpnt->SCp.buffer = scsi_sglist(SCpnt);
|
|
SCpnt->SCp.buffers_residual = scsi_sg_count(SCpnt) - 1;
|
|
SCpnt->SCp.ptr = sg_virt(SCpnt->SCp.buffer);
|
|
SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
|
|
SCpnt->SCp.phase = scsi_bufflen(SCpnt);
|
|
|
|
#ifdef BELT_AND_BRACES
|
|
{ /*
|
|
* Calculate correct buffer length. Some commands
|
|
* come in with the wrong scsi_bufflen.
|
|
*/
|
|
struct scatterlist *sg;
|
|
unsigned i, sg_count = scsi_sg_count(SCpnt);
|
|
|
|
scsi_for_each_sg(SCpnt, sg, sg_count, i)
|
|
len += sg->length;
|
|
|
|
if (scsi_bufflen(SCpnt) != len) {
|
|
printk(KERN_WARNING
|
|
"scsi%d.%c: bad request buffer "
|
|
"length %d, should be %ld\n",
|
|
SCpnt->device->host->host_no,
|
|
'0' + SCpnt->device->id,
|
|
scsi_bufflen(SCpnt), len);
|
|
/*
|
|
* FIXME: Totaly naive fixup. We should abort
|
|
* with error
|
|
*/
|
|
SCpnt->SCp.phase =
|
|
min_t(unsigned long, len,
|
|
scsi_bufflen(SCpnt));
|
|
}
|
|
}
|
|
#endif
|
|
} else {
|
|
SCpnt->SCp.ptr = NULL;
|
|
SCpnt->SCp.this_residual = 0;
|
|
SCpnt->SCp.phase = 0;
|
|
}
|
|
}
|