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[PATCH] libata: implement dummy port

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Implement dummy port which can be requested by setting appropriate bit
in probe_ent->dummy_port_mask.  The dummy port is used as placeholder
for stolen legacy port.  This allows libata to guarantee that
index_of(ap) == ap->port_no == actual_device_port_no, and thus to
remove error-prone ap->hard_port_no.

As it's used only when one port of a legacy controller is reserved by
some other entity (e.g. IDE), the focus is on keeping the added *code*
complexity at minimum, so dummy port allocates all libata core
resources and acts as a normal port.  It just has all dummy port_ops.

This patch only implements dummy port.  The following patch will make
libata use it for stolen legacy ports.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo
2006-08-10 16:59:12 +09:00
parent 2ec7df0457
commit dd5b06c490
2 changed files with 59 additions and 10 deletions
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8
include/linux/libata.h
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@ -353,6 +353,7 @@ struct ata_probe_ent {
struct ata_ioports port[ATA_MAX_PORTS];
unsigned int n_ports;
unsigned int hard_port_no;
unsigned int dummy_port_mask;
unsigned int pio_mask;
unsigned int mwdma_mask;
unsigned int udma_mask;
@ -652,6 +653,8 @@ extern const unsigned long sata_deb_timing_normal[];
extern const unsigned long sata_deb_timing_hotplug[];
extern const unsigned long sata_deb_timing_long[];
extern const struct ata_port_operations ata_dummy_port_ops;
static inline const unsigned long *
sata_ehc_deb_timing(struct ata_eh_context *ehc)
{
@ -661,6 +664,11 @@ sata_ehc_deb_timing(struct ata_eh_context *ehc)
return sata_deb_timing_normal;
}
static inline int ata_port_is_dummy(struct ata_port *ap)
{
return ap->ops == &ata_dummy_port_ops;
}
extern void ata_port_probe(struct ata_port *);
extern void __sata_phy_reset(struct ata_port *ap);
extern void sata_phy_reset(struct ata_port *ap);