libata: make PMP support optional

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>

3 files changed, 25 insertions, 1 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 48c8fc55391e..3eb6035b61b8 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -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
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index e6e41b2c731c..1fbc2aa648b7 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -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
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 42b30e38495d..4aeeabb10a47 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -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