diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/arm/scsi.h |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/scsi/arm/scsi.h')
-rw-r--r-- | drivers/scsi/arm/scsi.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/scsi/arm/scsi.h b/drivers/scsi/arm/scsi.h new file mode 100644 index 00000000000..2f1b3f4bf95 --- /dev/null +++ b/drivers/scsi/arm/scsi.h @@ -0,0 +1,115 @@ +/* + * 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. + */ + +#define BELT_AND_BRACES + +/* + * The scatter-gather list handling. This contains all + * the yucky stuff that needs to be fixed properly. + */ +static inline int copy_SCp_to_sg(struct scatterlist *sg, Scsi_Pointer *SCp, int max) +{ + int bufs = SCp->buffers_residual; + + BUG_ON(bufs + 1 > max); + + sg->page = virt_to_page(SCp->ptr); + sg->offset = offset_in_page(SCp->ptr); + sg->length = SCp->this_residual; + + if (bufs) + memcpy(sg + 1, SCp->buffer + 1, + sizeof(struct scatterlist) * bufs); + return bufs + 1; +} + +static inline int next_SCp(Scsi_Pointer *SCp) +{ + int ret = SCp->buffers_residual; + if (ret) { + SCp->buffer++; + SCp->buffers_residual--; + SCp->ptr = (char *) + (page_address(SCp->buffer->page) + + SCp->buffer->offset); + SCp->this_residual = SCp->buffer->length; + } else { + SCp->ptr = NULL; + SCp->this_residual = 0; + } + return ret; +} + +static inline unsigned char get_next_SCp_byte(Scsi_Pointer *SCp) +{ + char c = *SCp->ptr; + + SCp->ptr += 1; + SCp->this_residual -= 1; + + return c; +} + +static inline void put_next_SCp_byte(Scsi_Pointer *SCp, unsigned char c) +{ + *SCp->ptr = c; + SCp->ptr += 1; + SCp->this_residual -= 1; +} + +static inline void init_SCp(Scsi_Cmnd *SCpnt) +{ + memset(&SCpnt->SCp, 0, sizeof(struct scsi_pointer)); + + if (SCpnt->use_sg) { + unsigned long len = 0; + int buf; + + SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer; + SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1; + SCpnt->SCp.ptr = (char *) + (page_address(SCpnt->SCp.buffer->page) + + SCpnt->SCp.buffer->offset); + SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length; + +#ifdef BELT_AND_BRACES + /* + * Calculate correct buffer length. Some commands + * come in with the wrong request_bufflen. + */ + for (buf = 0; buf <= SCpnt->SCp.buffers_residual; buf++) + len += SCpnt->SCp.buffer[buf].length; + + if (SCpnt->request_bufflen != 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, SCpnt->request_bufflen, len); + SCpnt->request_bufflen = len; +#endif + } else { + SCpnt->SCp.ptr = (unsigned char *)SCpnt->request_buffer; + SCpnt->SCp.this_residual = SCpnt->request_bufflen; + } + + /* + * If the upper SCSI layers pass a buffer, but zero length, + * we aren't interested in the buffer pointer. + */ + if (SCpnt->SCp.this_residual == 0 && SCpnt->SCp.ptr) { +#if 0 //def BELT_AND_BRACES + printk(KERN_WARNING "scsi%d.%c: zero length buffer passed for " + "command ", SCpnt->host->host_no, '0' + SCpnt->target); + print_command(SCpnt->cmnd); +#endif + SCpnt->SCp.ptr = NULL; + } +} |