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libata: add ATAPI_* cmd types and implement atapi_cmd_type()

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Add ATAPI command types - ATAPI_READ, WRITE, RW_BUF, READ_CD and MISC,
and implement atapi_cmd_type() which takes SCSI opcode and returns to
which class the opcode belongs.  This will be used later to improve
ATAPI handling.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-12-05 16:43:06 +09:00 committed by Jeff Garzik
parent 0dc36888d4
commit ceb0c64262
1 changed files with 28 additions and 0 deletions
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28
include/linux/libata.h
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@ -35,6 +35,7 @@
#include <linux/workqueue.h>
#include <scsi/scsi_host.h>
#include <linux/acpi.h>
#include <linux/cdrom.h>
/*
* Define if arch has non-standard setup. This is a _PCI_ standard
@ -346,6 +347,12 @@ enum {
ATA_DMA_MASK_ATA = (1 << 0), /* DMA on ATA Disk */
ATA_DMA_MASK_ATAPI = (1 << 1), /* DMA on ATAPI */
ATA_DMA_MASK_CFA = (1 << 2), /* DMA on CF Card */
/* ATAPI command types */
ATAPI_READ = 0, /* READs */
ATAPI_WRITE = 1, /* WRITEs */
ATAPI_READ_CD = 2, /* READ CD [MSF] */
ATAPI_MISC = 3, /* the rest */
};
enum ata_xfer_mask {
@ -1408,6 +1415,27 @@ static inline int ata_try_flush_cache(const struct ata_device *dev)
ata_id_has_flush_ext(dev->id);
}
static inline int atapi_cmd_type(u8 opcode)
{
switch (opcode) {
case GPCMD_READ_10:
case GPCMD_READ_12:
return ATAPI_READ;
case GPCMD_WRITE_10:
case GPCMD_WRITE_12:
case GPCMD_WRITE_AND_VERIFY_10:
return ATAPI_WRITE;
case GPCMD_READ_CD:
case GPCMD_READ_CD_MSF:
return ATAPI_READ_CD;
default:
return ATAPI_MISC;
}
}
static inline unsigned int ac_err_mask(u8 status)
{
if (status & (ATA_BUSY | ATA_DRQ))