libata: make SFF support optional
Now that SFF support is completely separated out from the core layer,
it can be made optional. Add CONFIG_ATA_SFF and let SFF drivers
depend on it. If CONFIG_ATA_SFF isn't set, all codes in libata-sff.c
and data structures for SFF support are disabled. This saves good
number of bytes for small systems.
Signed-off-by: Tejun Heo <htejun@gmail.com>
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 037db18..db77b90 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -445,6 +445,7 @@
};
extern struct class_device_attribute class_device_attr_link_power_management_policy;
+#ifdef CONFIG_ATA_SFF
struct ata_ioports {
void __iomem *cmd_addr;
void __iomem *data_addr;
@@ -462,6 +463,7 @@
void __iomem *bmdma_addr;
void __iomem *scr_addr;
};
+#endif /* CONFIG_ATA_SFF */
struct ata_host {
spinlock_t lock;
@@ -648,7 +650,9 @@
struct ata_prd *prd; /* our SG list */
dma_addr_t prd_dma; /* and its DMA mapping */
+#ifdef CONFIG_ATA_SFF
struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
+#endif /* CONFIG_ATA_SFF */
u8 ctl; /* cache of ATA control register */
u8 last_ctl; /* Cache last written value */
@@ -760,6 +764,7 @@
void (*port_stop)(struct ata_port *ap);
void (*host_stop)(struct ata_host *host);
+#ifdef CONFIG_ATA_SFF
/*
* SFF / taskfile oriented ops
*/
@@ -779,6 +784,7 @@
void (*bmdma_start)(struct ata_queued_cmd *qc);
void (*bmdma_stop)(struct ata_queued_cmd *qc);
u8 (*bmdma_status)(struct ata_port *ap);
+#endif /* CONFIG_ATA_SFF */
/*
* Obsolete
@@ -1349,6 +1355,8 @@
/**************************************************************************
* SFF - drivers/ata/libata-sff.c
*/
+#ifdef CONFIG_ATA_SFF
+
extern const struct ata_port_operations ata_sff_port_ops;
extern const struct ata_port_operations ata_bmdma_port_ops;
@@ -1489,5 +1497,6 @@
return status;
}
+#endif /* CONFIG_ATA_SFF */
#endif /* __LINUX_LIBATA_H__ */