Patch set updated for coreboot: 6d38978 AMD K8 fam10: Relocate SB_HT_CHAIN in devicetree

[Kyösti Mälkki]

Kyösti Mälkki ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8560

-gerrit

commit 6d389782ce004a88c62ed6d50df34cd2008a7468
Author: Kyösti Mälkki 
Date:   Sat Feb 21 14:31:01 2015 +0200

AMD K8 fam10: Relocate SB_HT_CHAIN in devicetree

When we want to scan the HT chain to southbridge first, we
    relocate it as the first item of dev->link_list of node 0.

Change-Id: Ic73ba43aadb3c5e0c8d4b82ed7d41094692ea37f
    Signed-off-by: Kyösti Mälkki 
---
 src/northbridge/amd/amdfam10/northbridge.c | 45 +++++++++++++++++++++++------
 src/northbridge/amd/amdk8/northbridge.c    | 46 +++++++++++++++++++++++-------
 2 files changed, 72 insertions(+), 19 deletions(-)

diff --git a/src/northbridge/amd/amdfam10/northbridge.c b/src/northbridge/amd/amdfam10/northbridge.c
index 8503afd..a305f65 100644
--- a/src/northbridge/amd/amdfam10/northbridge.c
+++ b/src/northbridge/amd/amdfam10/northbridge.c
@@ -271,6 +271,36 @@ static u32 amdfam10_scan_chain(device_t dev, u32 nodeid, struct bus *link, bool
    	return link->subordinate;
 }

+/* Do sb ht chain at first, in case s2885 put sb chain
+ * (8131/8111) on link2, but put 8151 on link0.
+ */
+static void relocate_sb_ht_chain(void)
+{
+	struct device *dev;
+	struct bus *link, *prev = NULL;
+	u8 sblink;
+
+	if (!CONFIG_SB_HT_CHAIN_ON_BUS0)
+		return;
+
+	dev = dev_find_slot(CONFIG_CBB, PCI_DEVFN(CONFIG_CDB, 0));
+	sblink = (pci_read_config32(dev, 0x64)>>8) & 7;
+	link = dev->link_list;
+
+	while (link) {
+		if (link->link_num == sblink) {
+			if (!prev)
+				return;
+			prev->next = link->next;
+			link->next = dev->link_list;
+			dev->link_list = link;
+			return;
+		}
+		prev = link;
+		link = link->next;
+	}
+}
+
 static void amdfam10_scan_chains(device_t dev)
 {
    unsigned nodeid;
@@ -283,15 +313,6 @@ static void amdfam10_scan_chains(device_t dev)
    /* Do sb ht chain at first, in case s2885 put sb chain (8131/8111) on link2, but put 8151 on link0 */
    for (link = dev->link_list; link; link = link->next) {
    	bool is_sblink = (nodeid == 0) && (link->link_num == sblink);
-		if ((CONFIG_SB_HT_CHAIN_ON_BUS0 > 0) && is_sblink)
-			max = amdfam10_scan_chain(dev, nodeid, link, is_sblink, max);
-	}
-
-	for (link = dev->link_list; link; link = link->next) {
-		bool is_sblink = (nodeid == 0) && (link->link_num == sblink);
-		if ((CONFIG_SB_HT_CHAIN_ON_BUS0 > 0) && is_sblink)
-			continue;
-
    	max = amdfam10_scan_chain(dev, nodeid, link, is_sblink, max);
    }

@@ -582,9 +603,15 @@ static const struct pci_driver mcf0_driver __pci_driver = {
    .device = 0x1200,
 };

+static void amdfam10_nb_init(void *chip_info)
+{
+	relocate_sb_ht_chain();
+}
+
 struct chip_operations northbridge_amd_amdfam10_ops = {
    CHIP_NAME("AMD FAM10 Northbridge")
    .enable_dev = 0,
+	.init = amdfam10_nb_init,
 };

static void amdfam10_domain_read_resources(device_t dev)
diff --git a/src/northbridge/amd/amdk8/northbridge.c b/src/northbridge/amd/amdk8/northbridge.c
index edd1e1f..d1f3d81 100644
--- a/src/northbridge/amd/amdk8/northbridge.c
+++ b/src/northbridge/amd/amdk8/northbridge.c
@@ -240,6 +240,36 @@ static u32 amdk8_scan_chain(device_t dev, u32 nodeid, struct bus *link, bool is_
    	return link->subordinate;
 }

+/* Do sb ht chain at first, in case s2885 put sb chain
+ * (8131/8111) on link2, but put 8151 on link0.
+ */
+static void relocate_sb_ht_chain(void)
+{
+	struct device *dev;
+	struct bus *link, *prev = NULL;
+	u8 sblink;
+
+	if (!CONFIG_SB_HT_CHAIN_ON_BUS0)
+		return;
+
+	dev = dev_find_slot(CONFIG_CBB, PCI_DEVFN(CONFIG_CDB, 0));
+	sblink = (pci_read_config32(dev, 0x64)>>8) & 3;
+	link = dev->link_list;
+
+	while (link) {
+		if (link->link_num == sblink) {
+			if (!prev)
+				return;
+			prev->next = link->next;
+			link->next = dev->link_list;
+			dev->link_list = link;
+			return;
+		}
+		prev = link;
+		link = link->next;
+	}
+}
+
 static void amdk8_scan_chains(device_t dev)
 {
    unsigned nodeid;
@@ -251,18 +281,8 @@ static void amdk8_scan_chains(device_t dev)
    if (nodeid == 0)
    	sblink = (pci_read_config32(dev, 0x64)>>8) & 3;

-	// do sb ht chain at first, in case s2885 put sb chain (8131/8111) on link2, but put 8151 on link0
    for (link = dev->link_list; link; link = link->next) {
    	bool is_sblink = (nodeid == 0) && (link->link_num == sblink);
-		if ((CONFIG_SB_HT_CHAIN_ON_BUS0 > 0) && is_sblink)
-			max = amdk8_scan_chain(dev, nodeid, link, is_sblink, max);
-	}
-
-	for (link = dev->link_list; link; link = link->next) {
-		bool is_sblink = (nodeid == 0) && (link->link_num == sblink);
-		if ((CONFIG_SB_HT_CHAIN_ON_BUS0 > 0) && is_sblink)
-			continue;
-
    	max = amdk8_scan_chain(dev, nodeid, link, is_sblink, max);
    }

@@ -604,9 +624,15 @@ static const struct pci_driver mcf0_driver __pci_driver = {
    .device = 0x1100,
 };

+static void amdk8_nb_init(void *chip_info)
+{
+	relocate_sb_ht_chain();
+}
+
 struct chip_operations northbridge_amd_amdk8_ops = {
    CHIP_NAME("AMD K8 Northbridge")
    .enable_dev = 0,
+	.init = amdk8_nb_init,
 };

static void amdk8_domain_read_resources(device_t dev)