libata-link: introduce ata_link

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>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/ata/sata_inic162x.c b/drivers/ata/sata_inic162x.c
index fdbed8ecdfc2..3c0ef7a2f2fe 100644
--- a/drivers/ata/sata_inic162x.c
+++ b/drivers/ata/sata_inic162x.c
@@ -285,7 +285,7 @@ static void inic_irq_clear(struct ata_port *ap)
 static void inic_host_intr(struct ata_port *ap)
 {
         void __iomem *port_base = inic_port_base(ap);
-        struct ata_eh_info *ehi = &ap->eh_info;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
         u8 irq_stat;
 
         /* fetch and clear irq */
@@ -293,7 +293,8 @@ static void inic_host_intr(struct ata_port *ap)
         writeb(irq_stat, port_base + PORT_IRQ_STAT);
 
         if (likely(!(irq_stat & PIRQ_ERR))) {
-                struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+                struct ata_queued_cmd *qc =
+                        ata_qc_from_tag(ap, ap->link.active_tag);
 
                 if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
                         ata_chk_status(ap);     /* clear ATA interrupt */
@@ -421,7 +422,7 @@ static int inic_hardreset(struct ata_port *ap, unsigned int *class,
 {
         void __iomem *port_base = inic_port_base(ap);
         void __iomem *idma_ctl = port_base + PORT_IDMA_CTL;
-        const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
+        const unsigned long *timing = sata_ehc_deb_timing(&ap->link.eh_context);
         u16 val;
         int rc;