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[PATCH] libata CHS: calculate read/write commands and protocol on the fly (revise #6)

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- merge ata_prot_to_cmd() and ata_dev_set_protocol() as
       ata_rwcmd_protocol()
     - pave road for read/write multiple support
     - remove usage of pre-cached command and protocol values and call
       ata_rwcmd_protocol() instead

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>

==============
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Albert Lee 2005-10-12 15:06:27 +08:00 • committed by Jeff Garzik
commit 8cbd6df1f0
5 changed files with 50 additions and 79 deletions
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4
include/linux/ata.h
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@ -128,6 +128,10 @@ enum {
ATA_CMD_PIO_READ_EXT = 0x24,
ATA_CMD_PIO_WRITE = 0x30,
ATA_CMD_PIO_WRITE_EXT = 0x34,
ATA_CMD_READ_MULTI = 0xC4,
ATA_CMD_READ_MULTI_EXT = 0x29,
ATA_CMD_WRITE_MULTI = 0xC5,
ATA_CMD_WRITE_MULTI_EXT = 0x39,
ATA_CMD_SET_FEATURES = 0xEF,
ATA_CMD_PACKET = 0xA0,
ATA_CMD_VERIFY = 0x40,

6
include/linux/libata.h
View file

@ -283,10 +283,8 @@ struct ata_device {
u8 xfer_mode;
unsigned int xfer_shift; /* ATA_SHIFT_xxx */
/* cache info about current transfer mode */
u8 xfer_protocol; /* taskfile xfer protocol */
u8 read_cmd; /* opcode to use on read */
u8 write_cmd; /* opcode to use on write */
unsigned int multi_count; /* sectors count for
READ/WRITE MULTIPLE */
/* for CHS addressing */
u16 cylinders; /* Number of cylinders */