+void (*phy_reset) (struct ata_port *ap);
+ </programlisting>
+
+ <para>
+Deprecated. Use ->error_handler() instead.
+ </para>
+
+ <programlisting>
+void (*freeze) (struct ata_port *ap);
+void (*thaw) (struct ata_port *ap);
+ </programlisting>
+
+ <para>
+ata_port_freeze() is called when HSM violations or some other
+condition disrupts normal operation of the port. A frozen port
+is not allowed to perform any operation until the port is
+thawed, which usually follows a successful reset.
+ </para>
+
+ <para>
+The optional ->freeze() callback can be used for freezing the port
+hardware-wise (e.g. mask interrupt and stop DMA engine). If a
+port cannot be frozen hardware-wise, the interrupt handler
+must ack and clear interrupts unconditionally while the port
+is frozen.
+ </para>
+ <para>
+The optional ->thaw() callback is called to perform the opposite of ->freeze():
+prepare the port for normal operation once again. Unmask interrupts,
+start DMA engine, etc.
+ </para>
+
+ <programlisting>
+void (*error_handler) (struct ata_port *ap);
+ </programlisting>
+
+ <para>
+->error_handler() is a driver's hook into probe, hotplug, and recovery
+and other exceptional conditions. The primary responsibility of an
+implementation is to call ata_do_eh() or ata_bmdma_drive_eh() with a set
+of EH hooks as arguments:
+ </para>
+
+ <para>
+'prereset' hook (may be NULL) is called during an EH reset, before any other actions
+are taken.
+ </para>
+
+ <para>
+'postreset' hook (may be NULL) is called after the EH reset is performed. Based on
+existing conditions, severity of the problem, and hardware capabilities,
+ </para>
+
+ <para>
+Either 'softreset' (may be NULL) or 'hardreset' (may be NULL) will be
+called to perform the low-level EH reset.
+ </para>
+
+ <programlisting>
+void (*post_internal_cmd) (struct ata_queued_cmd *qc);