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| author | Tejun Heo <htejun@gmail.com> | 2006-08-10 16:59:12 +0900 |
|---|---|---|
| committer | Tejun Heo <htejun@gmail.com> | 2006-08-10 16:59:12 +0900 |
| commit | dd5b06c490de72440ec39f814de99a714a45a1a9 (patch) | |
| tree | 7a4665f9b6fdb5a264c753b90a215e2953e2d0f7 /include | |
| parent | 2ec7df0457b710d9201f211dbccdbecf0ad38b7e (diff) | |
| download | kernel_samsung_tuna-dd5b06c490de72440ec39f814de99a714a45a1a9.zip kernel_samsung_tuna-dd5b06c490de72440ec39f814de99a714a45a1a9.tar.gz kernel_samsung_tuna-dd5b06c490de72440ec39f814de99a714a45a1a9.tar.bz2 | |
[PATCH] libata: implement dummy port
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/libata.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h index 4504776..30bfe8f 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -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); |