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libata: make PMP support optional

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Make PMP support optional by adding CONFIG_SATA_PMP and leaving out
libata-pmp.c if it isn't set.  PMP helpers return constant values if
PMP support is not enabled and PMP declarations alias non-PMP
counterparts.  This makes the compiler to leave out PMP related part
out and LLDs to use non-PMP counterparts automatically.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo
2008-04-07 22:47:22 +09:00
committed by Jeff Garzik
parent 071f44b1d2
commit 88fcd56275
4 changed files with 52 additions and 1 deletions
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27
include/linux/libata.h
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@@ -1092,6 +1092,7 @@ extern const struct ata_port_operations sata_port_ops;
/*
* PMP helpers
*/
#ifdef CONFIG_SATA_PMP
static inline bool sata_pmp_supported(struct ata_port *ap)
{
return ap->flags & ATA_FLAG_PMP;
@@ -1106,6 +1107,22 @@ static inline int ata_is_host_link(const struct ata_link *link)
{
return link == &link->ap->link;
}
#else /* CONFIG_SATA_PMP */
static inline bool sata_pmp_supported(struct ata_port *ap)
{
return false;
}
static inline bool sata_pmp_attached(struct ata_port *ap)
{
return false;
}
static inline int ata_is_host_link(const struct ata_link *link)
{
return 1;
}
#endif /* CONFIG_SATA_PMP */
static inline int sata_srst_pmp(struct ata_link *link)
{
@@ -1369,11 +1386,21 @@ static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
/**************************************************************************
* PMP - drivers/ata/libata-pmp.c
*/
#ifdef CONFIG_SATA_PMP
extern const struct ata_port_operations sata_pmp_port_ops;
extern int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc);
extern void sata_pmp_error_handler(struct ata_port *ap);
#else /* CONFIG_SATA_PMP */
#define sata_pmp_port_ops sata_port_ops
#define sata_pmp_qc_defer_cmd_switch ata_std_qc_defer
#define sata_pmp_error_handler ata_std_error_handler
#endif /* CONFIG_SATA_PMP */
/**************************************************************************
* SFF - drivers/ata/libata-sff.c