[SCSI] aic94xx: Fix DDB and SCB initialization

Ed Chim of Adaptec informs us that the DDB registers need to be zeroed at
initialization time and that some SCB initializations need to happen even if
we don't use the SCB.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/aic94xx/aic94xx_init.c

@@ -234,7 +234,7 @@ static int __devinit asd_common_setup(struct asd_ha_struct *asd_ha)
 	}
 	/* Provide some sane default values. */
 	asd_ha->hw_prof.max_scbs = 512;
-	asd_ha->hw_prof.max_ddbs = 128;
+	asd_ha->hw_prof.max_ddbs = ASD_MAX_DDBS;
 	asd_ha->hw_prof.num_phys = ASD_MAX_PHYS;
 	/* All phys are enabled, by default. */
 	asd_ha->hw_prof.enabled_phys = 0xFF;

drivers/scsi/aic94xx/aic94xx_sas.h

@@ -34,6 +34,7 @@
  * domain that this sequencer can maintain low-level connections for
  * us.  They are be 64 bytes.
  */
+#define ASD_MAX_DDBS	128
 
 struct asd_ddb_ssp_smp_target_port {
 	u8     conn_type;	  /* byte 0 */

drivers/scsi/aic94xx/aic94xx_seq.c

@@ -907,6 +907,16 @@ static void asd_init_scb_sites(struct asd_ha_struct *asd_ha)
 		for (i = 0; i < ASD_SCB_SIZE; i += 4)
 			asd_scbsite_write_dword(asd_ha, site_no, i, 0);
 
+		/* Initialize SCB Site Opcode field to invalid. */
+		asd_scbsite_write_byte(asd_ha, site_no,
+				       offsetof(struct scb_header, opcode),
+				       0xFF);
+
+		/* Initialize SCB Site Flags field to mean a response
+		 * frame has been received.  This means inadvertent
+		 * frames received to be dropped. */
+		asd_scbsite_write_byte(asd_ha, site_no, 0x49, 0x01);
+
 		/* Workaround needed by SEQ to fix a SATA issue is to exclude
 		 * certain SCB sites from the free list. */
 		if (!SCB_SITE_VALID(site_no))
@@ -922,16 +932,6 @@ static void asd_init_scb_sites(struct asd_ha_struct *asd_ha)
 		/* Q_NEXT field of the last SCB is invalidated. */
 		asd_scbsite_write_word(asd_ha, site_no, 0, first_scb_site_no);
 
-		/* Initialize SCB Site Opcode field to invalid. */
-		asd_scbsite_write_byte(asd_ha, site_no,
-				       offsetof(struct scb_header, opcode),
-				       0xFF);
-
-		/* Initialize SCB Site Flags field to mean a response
-		 * frame has been received.  This means inadvertent
-		 * frames received to be dropped. */
-		asd_scbsite_write_byte(asd_ha, site_no, 0x49, 0x01);
-
 		first_scb_site_no = site_no;
 		max_scbs++;
 	}
@@ -1173,6 +1173,16 @@ static void asd_init_ddb_0(struct asd_ha_struct *asd_ha)
 	set_bit(0, asd_ha->hw_prof.ddb_bitmap);
 }
 
+static void asd_seq_init_ddb_sites(struct asd_ha_struct *asd_ha)
+{
+	unsigned int i;
+	unsigned int ddb_site;
+
+	for (ddb_site = 0 ; ddb_site < ASD_MAX_DDBS; ddb_site++)
+		for (i = 0; i < sizeof(struct asd_ddb_ssp_smp_target_port); i+= 4)
+			asd_ddbsite_write_dword(asd_ha, ddb_site, i, 0);
+}
+
 /**
  * asd_seq_setup_seqs -- setup and initialize central and link sequencers
  * @asd_ha: pointer to host adapter structure
@@ -1182,6 +1192,9 @@ static void asd_seq_setup_seqs(struct asd_ha_struct *asd_ha)
 	int 		lseq;
 	u8		lseq_mask;
 
+	/* Initialize DDB sites */
+	asd_seq_init_ddb_sites(asd_ha);
+
 	/* Initialize SCB sites. Done first to compute some values which
 	 * the rest of the init code depends on. */
 	asd_init_scb_sites(asd_ha);