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libata-link: introduce ata_link

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Introduce ata_link.  It abstracts PHY and sits between ata_port and
ata_device.  This new level of abstraction is necessary to support
SATA Port Multiplier, which basically adds a bunch of links (PHYs) to
a ATA host port.  Fields related to command execution, spd_limit and
EH are per-link and thus moved to ata_link.

This patch only defines the host link.  Multiple link handling will be
added later.  Also, a lot of ap->link derefences are added but many of
them will be removed as each part is converted to deal directly with
ata_link instead of ata_port.

This patch introduces no behavior change.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-08-06 18:36:22 +09:00
committed by Jeff Garzik
parent 640fdb5049
commit 9af5c9c97d
33 changed files with 280 additions and 255 deletions
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2
drivers/ata/pata_platform.c
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@ -35,7 +35,7 @@ static int pata_platform_set_mode(struct ata_port *ap, struct ata_device **unuse
int i;
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->device[i];
struct ata_device *dev = &ap->link.device[i];
if (ata_dev_enabled(dev)) {
/* We don't really care */