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libata: make SFF support optional

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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>
This commit is contained in:
Tejun Heo 2008-04-07 22:47:21 +09:00 • committed by Jeff Garzik
commit 127102aea2
6 changed files with 46 additions and 19 deletions
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9
include/linux/libata.h
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@ -445,6 +445,7 @@ enum link_pm {
};
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 @@ struct ata_ioports {
void __iomem *bmdma_addr;
void __iomem *scr_addr;
};
#endif /* CONFIG_ATA_SFF */
struct ata_host {
spinlock_t lock;
@ -648,7 +650,9 @@ struct ata_port {
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 @@ struct ata_port_operations {
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 @@ struct ata_port_operations {
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 @@ static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
/**************************************************************************
* 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 @@ static inline u8 ata_wait_idle(struct ata_port *ap)
return status;
}
#endif /* CONFIG_ATA_SFF */
#endif /* __LINUX_LIBATA_H__ */