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, 5 insertions, 4 deletions

diff --git a/drivers/ata/pdc_adma.c b/drivers/ata/pdc_adma.c
index c95c1bf7df37..064a3b505609 100644
--- a/drivers/ata/pdc_adma.c
+++ b/drivers/ata/pdc_adma.c
@@ -485,7 +485,7 @@ static inline unsigned int adma_intr_pkt(struct ata_host *host)
                 pp = ap->private_data;
                 if (!pp || pp->state != adma_state_pkt)
                         continue;
-                qc = ata_qc_from_tag(ap, ap->active_tag);
+                qc = ata_qc_from_tag(ap, ap->link.active_tag);
                 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
                         if (status & aPERR)
                                 qc->err_mask |= AC_ERR_HOST_BUS;
@@ -500,7 +500,7 @@ static inline unsigned int adma_intr_pkt(struct ata_host *host)
                         if (!qc->err_mask)
                                 ata_qc_complete(qc);
                         else {
-                                struct ata_eh_info *ehi = &ap->eh_info;
+                                struct ata_eh_info *ehi = &ap->link.eh_info;
                                 ata_ehi_clear_desc(ehi);
                                 ata_ehi_push_desc(ehi,
                                         "ADMA-status 0x%02X", status);
@@ -529,7 +529,7 @@ static inline unsigned int adma_intr_mmio(struct ata_host *host)
                         struct adma_port_priv *pp = ap->private_data;
                         if (!pp || pp->state != adma_state_mmio)
                                 continue;
-                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                         if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
 
                                 /* check main status, clearing INTRQ */
@@ -545,7 +545,8 @@ static inline unsigned int adma_intr_mmio(struct ata_host *host)
                                 if (!qc->err_mask)
                                         ata_qc_complete(qc);
                                 else {
-                                        struct ata_eh_info *ehi = &ap->eh_info;
+                                        struct ata_eh_info *ehi =
+                                                &ap->link.eh_info;
                                         ata_ehi_clear_desc(ehi);
                                         ata_ehi_push_desc(ehi,
                                                 "status 0x%02X", status);