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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 <[email protected]>
This commit is contained in:
Tejun Heo 2008-04-07 22:47:22 +09:00 • committed by Jeff Garzik
commit 88fcd56275
4 changed files with 52 additions and 1 deletions
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6
drivers/ata/Kconfig
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@ -41,6 +41,12 @@ config ATA_ACPI
You can disable this at kernel boot time by using the
option libata.noacpi=1
config SATA_PMP
bool "SATA Port Multiplier support"
default y
help
This option adds support for SATA Port Multipliers.
config SATA_AHCI
tristate "AHCI SATA support"
depends on PCI

3
drivers/ata/Makefile
View file

@ -78,6 +78,7 @@ obj-$(CONFIG_ATA_GENERIC) += ata_generic.o
# Should be last libata driver
obj-$(CONFIG_PATA_LEGACY) += pata_legacy.o
libata-objs := libata-core.o libata-scsi.o libata-eh.o libata-pmp.o
libata-objs := libata-core.o libata-scsi.o libata-eh.o
libata-$(CONFIG_ATA_SFF) += libata-sff.o
libata-$(CONFIG_SATA_PMP) += libata-pmp.o
libata-$(CONFIG_ATA_ACPI) += libata-acpi.o

17
drivers/ata/libata.h
View file

@ -203,9 +203,26 @@ extern int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
extern void ata_eh_finish(struct ata_port *ap);
/* libata-pmp.c */
#ifdef CONFIG_SATA_PMP
extern int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *val);
extern int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val);
extern int sata_pmp_attach(struct ata_device *dev);
#else /* CONFIG_SATA_PMP */
static inline int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *val)
{
return -EINVAL;
}
static inline int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
{
return -EINVAL;
}
static inline int sata_pmp_attach(struct ata_device *dev)
{
return -EINVAL;
}
#endif /* CONFIG_SATA_PMP */
/* libata-sff.c */
#ifdef CONFIG_ATA_SFF