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libata-sff: make BMDMA optional

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Make BMDMA optional depending on new config variable CONFIG_ATA_BMDMA.
In Kconfig, drivers are grouped into five groups - non-SFF native, SFF
w/ custom DMA interface, SFF w/ BMDMA, PIO-only SFF, and generic
fallback / legacy ones.  Kconfig and Makefile are reorganized
according to the groups and ordered alphabetically inside each group.

ata_ioports.bmdma_addr and ata_port.bmdma_prd[_dma] are put into
CONFIG_ATA_BMDMA, as are all bmdma related ops, variables and
functions.

This increase the binary size slightly when BMDMA is enabled but on
both native-only and PIO-only configurations the size is slightly
reduced.  Either way, the size difference is insignificant.  This
change is more meaningful to signify the separation between SFF and
BMDMA and as a tool to verify the separation.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2010-05-19 22:10:24 +02:00 • committed by Jeff Garzik
parent d6b0de8c28
commit 9a7780c9ac
4 changed files with 353 additions and 298 deletions
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22
include/linux/libata.h
View file

@ -513,7 +513,9 @@ struct ata_ioports {
void __iomem *command_addr;
void __iomem *altstatus_addr;
void __iomem *ctl_addr;
#ifdef CONFIG_ATA_BMDMA
void __iomem *bmdma_addr;
#endif /* CONFIG_ATA_BMDMA */
void __iomem *scr_addr;
};
#endif /* CONFIG_ATA_SFF */
@ -721,8 +723,10 @@ struct ata_port {
u8 ctl; /* cache of ATA control register */
u8 last_ctl; /* Cache last written value */
struct delayed_work sff_pio_task;
#ifdef CONFIG_ATA_BMDMA
struct ata_bmdma_prd *bmdma_prd; /* BMDMA SG list */
dma_addr_t bmdma_prd_dma; /* and its DMA mapping */
#endif /* CONFIG_ATA_BMDMA */
#endif /* CONFIG_ATA_SFF */
unsigned int pio_mask;
@ -856,10 +860,12 @@ struct ata_port_operations {
void (*sff_irq_clear)(struct ata_port *);
void (*sff_drain_fifo)(struct ata_queued_cmd *qc);
#ifdef CONFIG_ATA_BMDMA
void (*bmdma_setup)(struct ata_queued_cmd *qc);
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_BMDMA */
#endif /* CONFIG_ATA_SFF */
ssize_t (*em_show)(struct ata_port *ap, char *buf);
@ -1555,7 +1561,6 @@ extern void sata_pmp_error_handler(struct ata_port *ap);
#ifdef CONFIG_ATA_SFF
extern const struct ata_port_operations ata_sff_port_ops;
extern const struct ata_port_operations ata_bmdma_port_ops;
extern const struct ata_port_operations ata_bmdma32_port_ops;
/* PIO only, sg_tablesize and dma_boundary limits can be removed */
@ -1564,11 +1569,6 @@ extern const struct ata_port_operations ata_bmdma32_port_ops;
.sg_tablesize = LIBATA_MAX_PRD, \
.dma_boundary = ATA_DMA_BOUNDARY
#define ATA_BMDMA_SHT(drv_name) \
ATA_BASE_SHT(drv_name), \
.sg_tablesize = LIBATA_MAX_PRD, \
.dma_boundary = ATA_DMA_BOUNDARY
extern void ata_sff_dev_select(struct ata_port *ap, unsigned int device);
extern u8 ata_sff_check_status(struct ata_port *ap);
extern void ata_sff_pause(struct ata_port *ap);
@ -1625,6 +1625,15 @@ extern int ata_pci_sff_init_one(struct pci_dev *pdev,
struct scsi_host_template *sht, void *host_priv, int hflags);
#endif /* CONFIG_PCI */
#ifdef CONFIG_ATA_BMDMA
extern const struct ata_port_operations ata_bmdma_port_ops;
#define ATA_BMDMA_SHT(drv_name) \
ATA_BASE_SHT(drv_name), \
.sg_tablesize = LIBATA_MAX_PRD, \
.dma_boundary = ATA_DMA_BOUNDARY
extern void ata_bmdma_qc_prep(struct ata_queued_cmd *qc);
extern unsigned int ata_bmdma_qc_issue(struct ata_queued_cmd *qc);
extern void ata_bmdma_dumb_qc_prep(struct ata_queued_cmd *qc);
@ -1652,6 +1661,7 @@ extern int ata_pci_bmdma_init_one(struct pci_dev *pdev,
struct scsi_host_template *sht,
void *host_priv, int hflags);
#endif /* CONFIG_PCI */
#endif /* CONFIG_ATA_BMDMA */
/**
* ata_sff_busy_wait - Wait for a port status register