AMD K8 fam10: Drop extra HT scan_chain() parameters

Change-Id: Ice7cb89c19585cf725b6f73c33443050f8d65418
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/8565
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
Reviewed-by: Timothy Pearson <tpearson@raptorengineeringinc.com>

src/device/hypertransport.c

@@ -248,7 +248,7 @@ static void ht_collapse_early_enumeration(struct bus *bus,
 	}
 }
 
-unsigned int hypertransport_scan_chain(struct bus *bus, unsigned min_devfn,
+static unsigned int do_hypertransport_scan_chain(struct bus *bus, unsigned min_devfn,
 				       unsigned max_devfn,
 				       unsigned *ht_unitid_base,
 				       unsigned offset_unitid)
@@ -477,6 +477,30 @@ end_of_chain:
 	return next_unitid;
 }
 
+unsigned int hypertransport_scan_chain(struct bus *bus)
+{
+	int i;
+	unsigned int max_devfn;
+	u32 ht_unitid_base[4];
+
+	for (i = 0; i < 4; i++)
+		ht_unitid_base[i] = 0x20;
+
+	if (bus->secondary == 0)
+		max_devfn = (CONFIG_CDB << 3) - 1;
+	else
+		max_devfn = (0x20 << 3) - 1;
+
+	unsigned int next_unitid = do_hypertransport_scan_chain(bus, 0, max_devfn,
+					 ht_unitid_base, offset_unit_id(bus->secondary == 0));
+
+	bus->hcdn_reg = 0;
+	for (i = 0; i < 4; i++)
+		bus->hcdn_reg |= (ht_unitid_base[i] & 0xff) << (i*8);
+
+	return next_unitid;
+}
+
 /**
  * Scan a PCI bridge and the buses behind the bridge.
  *
@@ -495,7 +519,7 @@ static void hypertransport_scan_chain_x(struct bus *bus,
 	unsigned int ht_unitid_base[4];
 	unsigned int offset_unitid = 1;
 
-	unsigned int next_unitid = hypertransport_scan_chain(bus, min_devfn, max_devfn,
+	unsigned int next_unitid = do_hypertransport_scan_chain(bus, min_devfn, max_devfn,
 					 ht_unitid_base, offset_unitid);
 
 	/* Now that nothing is overlapping it is safe to scan the children. */

src/include/device/hypertransport.h

@@ -10,8 +10,7 @@
 #define ConnectionPending	(1 << 4)
 bool ht_is_non_coherent_link(struct bus *link);
 
-unsigned int hypertransport_scan_chain(struct bus *bus,
+unsigned int hypertransport_scan_chain(struct bus *bus);
-	unsigned min_devfn, unsigned max_devfn, unsigned *ht_unit_base, unsigned offset_unitid);
 void ht_scan_bridge(struct device *dev);
 
 extern struct device_operations default_ht_ops_bus;

src/northbridge/amd/amdfam10/northbridge.c

@@ -174,10 +174,7 @@ static void ht_route_link(struct bus *link, scan_state mode)
 
 static u32 amdfam10_scan_chain(struct bus *link, u32 max)
 {
-		int i;
 		unsigned int next_unitid;
-		u32 ht_unitid_base[4]; // here assume only 4 HT device on chain
-		u32 max_devfn;
 
 		/* See if there is an available configuration space mapping
 		 * register in function 1.
@@ -208,17 +205,8 @@ static u32 amdfam10_scan_chain(struct bus *link, u32 max)
 		/* Now we can scan all of the subordinate busses i.e. the
 		 * chain on the hypertranport link
 		 */
-		for(i=0;i<4;i++) {
-			ht_unitid_base[i] = 0x20;
-		}
 
-		//if ext conf is enabled, only need use 0x1f
+		next_unitid = hypertransport_scan_chain(link);
-		if (link->secondary == 0)
-			max_devfn = (0x17<<3) | 7;
-		else
-			max_devfn = (0x1f<<3) | 7;
-
-		next_unitid = hypertransport_scan_chain(link, 0, max_devfn, ht_unitid_base, offset_unit_id(link->secondary == 0));
 
 		/* Now that nothing is overlapping it is safe to scan the children. */
 		pci_scan_bus(link, 0x00, ((next_unitid - 1) << 3) | 7);
@@ -235,11 +223,6 @@ static u32 amdfam10_scan_chain(struct bus *link, u32 max)
 
 		set_config_map_reg(link);
 
-		/* Use ht_unitid_base to update hcdn_reg. */
-		link->hcdn_reg = 0;
-		for (i = 0; i < 4;i++)
-			link->hcdn_reg |= (ht_unitid_base[i] & 0xff) << (i*8);
-
 		store_ht_c_conf_bus(link);
 
 		return link->subordinate;

src/northbridge/amd/amdk8/northbridge.c

@@ -118,12 +118,10 @@ static u32 amdk8_nodeid(device_t dev)
 
 static u32 amdk8_scan_chain(struct bus *link, u32 max)
 {
-		int i;
 		unsigned int next_unitid;
+		int index;
 		u32 config_busses;
 		u32 free_reg, config_reg;
-		u32 ht_unitid_base[4]; // here assume only 4 HT device on chain
-		u32 max_devfn;
 		u32 nodeid = amdk8_nodeid(link->dev);
 
 		/* See if there is an available configuration space mapping
@@ -183,16 +181,8 @@ static u32 amdk8_scan_chain(struct bus *link, u32 max)
 		/* Now we can scan all of the subordinate busses i.e. the
 		 * chain on the hypertranport link
 		 */
-		for(i=0;i<4;i++) {
-			ht_unitid_base[i] = 0x20;
-		}
 
-		if (link->secondary == 0)
+		next_unitid = hypertransport_scan_chain(link);
-			max_devfn = (0x17<<3) | 7;
-		else
-			max_devfn = (0x1f<<3) | 7;
-
-		next_unitid = hypertransport_scan_chain(link, 0, max_devfn, ht_unitid_base, offset_unit_id(link->secondary == 0));
 
 		/* Now that nothing is overlapping it is safe to scan the children. */
 		pci_scan_bus(link, 0x00, ((next_unitid - 1) << 3) | 7);
@@ -207,13 +197,7 @@ static u32 amdk8_scan_chain(struct bus *link, u32 max)
 			(link->subordinate << 24);
 		f1_write_config32(config_reg, config_busses);
 
-
+		index = (config_reg-0xe0) >> 2;
-		// use config_reg and ht_unitid_base to update hcdn_reg
-		link->hcdn_reg = 0;
-		for (i = 0; i < 4; i++)
-			link->hcdn_reg |= (ht_unitid_base[i] & 0xff) << (i*8);
-
-		int index = (config_reg-0xe0) >> 2;
 		sysconf.hcdn_reg[index] = link->hcdn_reg;
 
 		return link->subordinate;