ata: move sata_link_hardreset() to libata-sata.c

* move sata_link_hardreset() to libata-sata.c

* add static inline for CONFIG_SATA_HOST=n case

* make sata_set_spd_needed() static

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  32724     572      40   33336    8238 drivers/ata/libata-core.o
after:
  32559     572      40   33171    8193 drivers/ata/libata-core.o

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/ata/libata-sata.c

@@ -449,7 +449,7 @@ static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
  *	RETURNS:
  *	1 if SATA spd configuration is needed, 0 otherwise.
  */
-int sata_set_spd_needed(struct ata_link *link)
+static int sata_set_spd_needed(struct ata_link *link)
 {
 	u32 scontrol;
 
@@ -490,6 +490,119 @@ int sata_set_spd(struct ata_link *link)
 }
 EXPORT_SYMBOL_GPL(sata_set_spd);
 
+/**
+ *	sata_link_hardreset - reset link via SATA phy reset
+ *	@link: link to reset
+ *	@timing: timing parameters { interval, duration, timeout } in msec
+ *	@deadline: deadline jiffies for the operation
+ *	@online: optional out parameter indicating link onlineness
+ *	@check_ready: optional callback to check link readiness
+ *
+ *	SATA phy-reset @link using DET bits of SControl register.
+ *	After hardreset, link readiness is waited upon using
+ *	ata_wait_ready() if @check_ready is specified.  LLDs are
+ *	allowed to not specify @check_ready and wait itself after this
+ *	function returns.  Device classification is LLD's
+ *	responsibility.
+ *
+ *	*@online is set to one iff reset succeeded and @link is online
+ *	after reset.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
+			unsigned long deadline,
+			bool *online, int (*check_ready)(struct ata_link *))
+{
+	u32 scontrol;
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	if (online)
+		*online = false;
+
+	if (sata_set_spd_needed(link)) {
+		/* SATA spec says nothing about how to reconfigure
+		 * spd.  To be on the safe side, turn off phy during
+		 * reconfiguration.  This works for at least ICH7 AHCI
+		 * and Sil3124.
+		 */
+		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+			goto out;
+
+		scontrol = (scontrol & 0x0f0) | 0x304;
+
+		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
+			goto out;
+
+		sata_set_spd(link);
+	}
+
+	/* issue phy wake/reset */
+	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+		goto out;
+
+	scontrol = (scontrol & 0x0f0) | 0x301;
+
+	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
+		goto out;
+
+	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
+	 * 10.4.2 says at least 1 ms.
+	 */
+	ata_msleep(link->ap, 1);
+
+	/* bring link back */
+	rc = sata_link_resume(link, timing, deadline);
+	if (rc)
+		goto out;
+	/* if link is offline nothing more to do */
+	if (ata_phys_link_offline(link))
+		goto out;
+
+	/* Link is online.  From this point, -ENODEV too is an error. */
+	if (online)
+		*online = true;
+
+	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
+		/* If PMP is supported, we have to do follow-up SRST.
+		 * Some PMPs don't send D2H Reg FIS after hardreset if
+		 * the first port is empty.  Wait only for
+		 * ATA_TMOUT_PMP_SRST_WAIT.
+		 */
+		if (check_ready) {
+			unsigned long pmp_deadline;
+
+			pmp_deadline = ata_deadline(jiffies,
+						    ATA_TMOUT_PMP_SRST_WAIT);
+			if (time_after(pmp_deadline, deadline))
+				pmp_deadline = deadline;
+			ata_wait_ready(link, pmp_deadline, check_ready);
+		}
+		rc = -EAGAIN;
+		goto out;
+	}
+
+	rc = 0;
+	if (check_ready)
+		rc = ata_wait_ready(link, deadline, check_ready);
+ out:
+	if (rc && rc != -EAGAIN) {
+		/* online is set iff link is online && reset succeeded */
+		if (online)
+			*online = false;
+		ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
+	}
+	DPRINTK("EXIT, rc=%d\n", rc);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(sata_link_hardreset);
+
 /**
  *	ata_slave_link_init - initialize slave link
  *	@ap: port to initialize slave link for