[PATCH] powerpc: move iSeries PCI devices to the device tree

Move the probing of PCI devices to setup.c and put them all into the
flattened device tree.  The later probing is now done by traversing the
device tree.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

4 files changed, 286 insertions, 200 deletions

diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
index be3fbfc24e6..62bbbcf5ded 100644
--- a/arch/powerpc/platforms/iseries/irq.c
+++ b/arch/powerpc/platforms/iseries/irq.c
@@ -42,6 +42,7 @@
 #include <asm/iseries/it_lp_queue.h>
 
 #include "irq.h"
+#include "pci.h"
 #include "call_pci.h"
 
 #if defined(CONFIG_SMP)
@@ -312,12 +313,12 @@ static hw_irq_controller iSeries_IRQ_handler = {
  * Note that sub_bus is always 0 (at the moment at least).
  */
 int __init iSeries_allocate_IRQ(HvBusNumber bus,
-		HvSubBusNumber sub_bus, HvAgentId dev_id)
+		HvSubBusNumber sub_bus, u32 bsubbus)
 {
 	int virtirq;
 	unsigned int realirq;
-	u8 idsel = (dev_id >> 4);
-	u8 function = dev_id & 7;
+	u8 idsel = ISERIES_GET_DEVICE_FROM_SUBBUS(bsubbus);
+	u8 function = ISERIES_GET_FUNCTION_FROM_SUBBUS(bsubbus);
 
 	realirq = (((((sub_bus << 8) + (bus - 1)) << 3) + (idsel - 1)) << 3)
 		+ function;
diff --git a/arch/powerpc/platforms/iseries/irq.h b/arch/powerpc/platforms/iseries/irq.h
index b9c801ba5a4..188aa808abd 100644
--- a/arch/powerpc/platforms/iseries/irq.h
+++ b/arch/powerpc/platforms/iseries/irq.h
@@ -2,7 +2,7 @@
 #define	_ISERIES_IRQ_H
 
 extern void iSeries_init_IRQ(void);
-extern int  iSeries_allocate_IRQ(HvBusNumber, HvSubBusNumber, HvAgentId);
+extern int  iSeries_allocate_IRQ(HvBusNumber, HvSubBusNumber, u32);
 extern void iSeries_activate_IRQs(void);
 extern int iSeries_get_irq(struct pt_regs *);
 
diff --git a/arch/powerpc/platforms/iseries/pci.c b/arch/powerpc/platforms/iseries/pci.c
index 91a94747eda..9d571e74909 100644
--- a/arch/powerpc/platforms/iseries/pci.c
+++ b/arch/powerpc/platforms/iseries/pci.c
@@ -49,14 +49,9 @@
  * Forward declares of prototypes.
  */
 static struct device_node *find_Device_Node(int bus, int devfn);
-static void scan_PHB_slots(struct pci_controller *Phb);
-static void scan_EADS_bridge(HvBusNumber Bus, HvSubBusNumber SubBus, int IdSel);
-static int scan_bridge_slot(HvBusNumber Bus, struct HvCallPci_BridgeInfo *Info);
 
 LIST_HEAD(iSeries_Global_Device_List);
 
-static int DeviceCount;
-
 static int Pci_Retry_Max = 3;	/* Only retry 3 times  */
 static int Pci_Error_Flag = 1;	/* Set Retry Error on. */
 
@@ -162,32 +157,6 @@ static void pci_Log_Error(char *Error_Text, int Bus, int SubBus,
 }
 
 /*
- * build_device_node(u16 Bus, int SubBus, u8 DevFn)
- */
-static struct device_node *build_device_node(HvBusNumber Bus,
-		HvSubBusNumber SubBus, int AgentId, int Function)
-{
-	struct device_node *node;
-	struct pci_dn *pdn;
-
-	node = kzalloc(sizeof(struct device_node), GFP_KERNEL);
-	if (node == NULL)
-		return NULL;
-	pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
-	if (pdn == NULL) {
-		kfree(node);
-		return NULL;
-	}
-	node->data = pdn;
-	pdn->node = node;
-	list_add_tail(&pdn->Device_List, &iSeries_Global_Device_List);
-	pdn->busno = Bus;
-	pdn->bussubno = SubBus;
-	pdn->devfn = PCI_DEVFN(ISERIES_ENCODE_DEVICE(AgentId), Function);
-	return node;
-}
-
-/*
  * iSeries_pcibios_init
  *
  * Description:
@@ -199,33 +168,86 @@ static struct device_node *build_device_node(HvBusNumber Bus,
 void iSeries_pcibios_init(void)
 {
 	struct pci_controller *phb;
-	HvBusNumber bus;
-
-	/* Check all possible buses. */
-	for (bus = 0; bus < 256; bus++) {
-		int ret = HvCallXm_testBus(bus);
-		if (ret == 0) {
-			printk("bus %d appears to exist\n", bus);
-
-			phb = pcibios_alloc_controller(NULL);
-			if (phb == NULL)
-				return -ENOMEM;
+	struct device_node *node;
+	struct device_node *dn;
+
+	for_each_node_by_type(node, "pci") {
+		HvBusNumber bus;
+		u32 *busp;
+
+		busp = (u32 *)get_property(node, "bus-range", NULL);
+		if (busp == NULL)
+			continue;
+		bus = *busp;
+		printk("bus %d appears to exist\n", bus);
+		phb = pcibios_alloc_controller(node);
+		if (phb == NULL)
+			continue;
+
+		phb->pci_mem_offset = phb->local_number = bus;
+		phb->first_busno = bus;
+		phb->last_busno = bus;
+		phb->ops = &iSeries_pci_ops;
+
+		/* Find and connect the devices. */
+		for (dn = NULL; (dn = of_get_next_child(node, dn)) != NULL;) {
+			struct pci_dn *pdn;
+			u8 irq;
+			int err;
+			u32 *agent;
+			u32 *reg;
+			u32 *lsn;
+
+			reg = (u32 *)get_property(dn, "reg", NULL);
+			if (reg == NULL) {
+				printk(KERN_DEBUG "no reg property!\n");
+				continue;
+			}
+			busp = (u32 *)get_property(dn, "linux,subbus", NULL);
+			if (busp == NULL) {
+				printk(KERN_DEBUG "no subbus property!\n");
+				continue;
+			}
+			agent = (u32 *)get_property(dn, "linux,agent-id", NULL);
+			if (agent == NULL) {
+				printk(KERN_DEBUG "no agent-id\n");
+				continue;
+			}
+			lsn = (u32 *)get_property(dn,
+					"linux,logical-slot-number", NULL);
+			if (lsn == NULL) {
+				printk(KERN_DEBUG "no logical-slot-number\n");
+				continue;
+			}
 
-			phb->pci_mem_offset = phb->local_number = bus;
-			phb->first_busno = bus;
-			phb->last_busno = bus;
-			phb->ops = &iSeries_pci_ops;
+			irq = iSeries_allocate_IRQ(bus, 0, *busp);
+			err = HvCallXm_connectBusUnit(bus, *busp, *agent, irq);
+			if (err) {
+				pci_Log_Error("Connect Bus Unit",
+					      bus, *busp, *agent, err);
+				continue;
+			}
+			err = HvCallPci_configStore8(bus, *busp, *agent,
+					PCI_INTERRUPT_LINE, irq);
+			if (err) {
+				pci_Log_Error("PciCfgStore Irq Failed!",
+						bus, *busp, *agent, err);
+				continue;
+			}
 
-			/* Find and connect the devices. */
-			scan_PHB_slots(phb);
+			pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
+			if (pdn == NULL)
+				return;
+			dn->data = pdn;
+			pdn->node = dn;
+			pdn->busno = bus;
+			pdn->devfn = (reg[0] >> 8) & 0xff;
+			pdn->bussubno = *busp;
+			pdn->Irq = irq;
+			pdn->LogicalSlot = *lsn;
+			list_add_tail(&pdn->Device_List,
+					&iSeries_Global_Device_List);
 		}
-		/*
-		 * Check for Unexpected Return code, a clue that something
-		 * has gone wrong.
-		 */
-		else if (ret != 0x0301)
-			printk(KERN_ERR "Unexpected Return on Probe(0x%04X): 0x%04X",
-			       bus, ret);
 	}
 }
 
@@ -272,147 +294,6 @@ void pcibios_fixup_resources(struct pci_dev *pdev)
 }
 
 /*
- * Loop through each node function to find usable EADs bridges.
- */
-static void scan_PHB_slots(struct pci_controller *Phb)
-{
-	struct HvCallPci_DeviceInfo *DevInfo;
-	HvBusNumber bus = Phb->local_number;	/* System Bus */
-	const HvSubBusNumber SubBus = 0;	/* EADs is always 0. */
-	int HvRc = 0;
-	int IdSel;
-	const int MaxAgents = 8;
-
-	DevInfo = kmalloc(sizeof(struct HvCallPci_DeviceInfo), GFP_KERNEL);
-	if (DevInfo == NULL)
-		return;
-
-	/*
-	 * Probe for EADs Bridges
-	 */
-	for (IdSel = 1; IdSel < MaxAgents; ++IdSel) {
-		HvRc = HvCallPci_getDeviceInfo(bus, SubBus, IdSel,
-				iseries_hv_addr(DevInfo),
-				sizeof(struct HvCallPci_DeviceInfo));
-		if (HvRc == 0) {
-			if (DevInfo->deviceType == HvCallPci_NodeDevice)
-				scan_EADS_bridge(bus, SubBus, IdSel);
-			else
-				printk("PCI: Invalid System Configuration(0x%02X)"
-				       " for bus 0x%02x id 0x%02x.\n",
-				       DevInfo->deviceType, bus, IdSel);
-		}
-		else
-			pci_Log_Error("getDeviceInfo", bus, SubBus, IdSel, HvRc);
-	}
-	kfree(DevInfo);
-}
-
-static void scan_EADS_bridge(HvBusNumber bus, HvSubBusNumber SubBus,
-		int IdSel)
-{
-	struct HvCallPci_BridgeInfo *BridgeInfo;
-	HvAgentId AgentId;
-	int Function;
-	int HvRc;
-
-	BridgeInfo = (struct HvCallPci_BridgeInfo *)
-		kmalloc(sizeof(struct HvCallPci_BridgeInfo), GFP_KERNEL);
-	if (BridgeInfo == NULL)
-		return;
-
-	/* Note: hvSubBus and irq is always be 0 at this level! */
-	for (Function = 0; Function < 8; ++Function) {
-		AgentId = ISERIES_PCI_AGENTID(IdSel, Function);
-		HvRc = HvCallXm_connectBusUnit(bus, SubBus, AgentId, 0);
-		if (HvRc == 0) {
-			printk("found device at bus %d idsel %d func %d (AgentId %x)\n",
-			       bus, IdSel, Function, AgentId);
-			/*  Connect EADs: 0x18.00.12 = 0x00 */
-			HvRc = HvCallPci_getBusUnitInfo(bus, SubBus, AgentId,
-					iseries_hv_addr(BridgeInfo),
-					sizeof(struct HvCallPci_BridgeInfo));
-			if (HvRc == 0) {
-				printk("bridge info: type %x subbus %x maxAgents %x maxsubbus %x logslot %x\n",
-					BridgeInfo->busUnitInfo.deviceType,
-					BridgeInfo->subBusNumber,
-					BridgeInfo->maxAgents,
-					BridgeInfo->maxSubBusNumber,
-					BridgeInfo->logicalSlotNumber);
-				if (BridgeInfo->busUnitInfo.deviceType ==
-						HvCallPci_BridgeDevice)  {
-					/* Scan_Bridge_Slot...: 0x18.00.12 */
-					scan_bridge_slot(bus, BridgeInfo);
-				} else
-					printk("PCI: Invalid Bridge Configuration(0x%02X)",
-						BridgeInfo->busUnitInfo.deviceType);
-			}
-		} else if (HvRc != 0x000B)
-			pci_Log_Error("EADs Connect",
-					bus, SubBus, AgentId, HvRc);
-	}
-	kfree(BridgeInfo);
-}
-
-/*
- * This assumes that the node slot is always on the primary bus!
- */
-static int scan_bridge_slot(HvBusNumber Bus,
-		struct HvCallPci_BridgeInfo *BridgeInfo)
-{
-	struct device_node *node;
-	HvSubBusNumber SubBus = BridgeInfo->subBusNumber;
-	u16 VendorId = 0;
-	int HvRc = 0;
-	u8 Irq = 0;
-	int IdSel = ISERIES_GET_DEVICE_FROM_SUBBUS(SubBus);
-	int Function = ISERIES_GET_FUNCTION_FROM_SUBBUS(SubBus);
-	HvAgentId EADsIdSel = ISERIES_PCI_AGENTID(IdSel, Function);
-
-	/* iSeries_allocate_IRQ.: 0x18.00.12(0xA3) */
-	Irq = iSeries_allocate_IRQ(Bus, 0, EADsIdSel);
-
-	/*
-	 * Connect all functions of any device found.
-	 */
-	for (IdSel = 1; IdSel <= BridgeInfo->maxAgents; ++IdSel) {
-		for (Function = 0; Function < 8; ++Function) {
-			HvAgentId AgentId = ISERIES_PCI_AGENTID(IdSel, Function);
-			HvRc = HvCallXm_connectBusUnit(Bus, SubBus,
-					AgentId, Irq);
-			if (HvRc != 0) {
-				pci_Log_Error("Connect Bus Unit",
-					      Bus, SubBus, AgentId, HvRc);
-				continue;
-			}
-
-			HvRc = HvCallPci_configLoad16(Bus, SubBus, AgentId,
-						      PCI_VENDOR_ID, &VendorId);
-			if (HvRc != 0) {
-				pci_Log_Error("Read Vendor",
-					      Bus, SubBus, AgentId, HvRc);
-				continue;
-			}
-			printk("read vendor ID: %x\n", VendorId);
-
-			/* FoundDevice: 0x18.28.10 = 0x12AE */
-			HvRc = HvCallPci_configStore8(Bus, SubBus, AgentId,
-						      PCI_INTERRUPT_LINE, Irq);
-			if (HvRc != 0)
-				pci_Log_Error("PciCfgStore Irq Failed!",
-					      Bus, SubBus, AgentId, HvRc);
-
-			++DeviceCount;
-			node = build_device_node(Bus, SubBus, EADsIdSel, Function);
-			PCI_DN(node)->Irq = Irq;
-			PCI_DN(node)->LogicalSlot = BridgeInfo->logicalSlotNumber;
-
-		} /* for (Function = 0; Function < 8; ++Function) */
-	} /* for (IdSel = 1; IdSel <= MaxAgents; ++IdSel) */
-	return HvRc;
-}
-
-/*
  * I/0 Memory copy MUST use mmio commands on iSeries
  * To do; For performance, include the hv call directly
  */
diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index fd6d0ebe8dd..d83f5ed4ec1 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -66,6 +66,8 @@
 #include "main_store.h"
 #include "call_sm.h"
 #include "call_hpt.h"
+#include "call_pci.h"
+#include "pci.h"
 
 #ifdef DEBUG
 #define DBG(fmt...) udbg_printf(fmt)
@@ -1000,6 +1002,207 @@ void dt_vdevices(struct iseries_flat_dt *dt)
 	dt_end_node(dt);
 }
 
+/*
+ * This assumes that the node slot is always on the primary bus!
+ */
+static void scan_bridge_slot(struct iseries_flat_dt *dt, HvBusNumber bus,
+		struct HvCallPci_BridgeInfo *bridge_info)
+{
+	HvSubBusNumber sub_bus = bridge_info->subBusNumber;
+	u16 vendor_id;
+	u16 device_id;
+	u32 class_id;
+	int err;
+	char buf[32];
+	u32 reg[5];
+	int id_sel = ISERIES_GET_DEVICE_FROM_SUBBUS(sub_bus);
+	int function = ISERIES_GET_FUNCTION_FROM_SUBBUS(sub_bus);
+	HvAgentId eads_id_sel = ISERIES_PCI_AGENTID(id_sel, function);
+
+	/*
+	 * Connect all functions of any device found.
+	 */
+	for (id_sel = 1; id_sel <= bridge_info->maxAgents; id_sel++) {
+		for (function = 0; function < 8; function++) {
+			u8 devfn;
+
+			HvAgentId agent_id = ISERIES_PCI_AGENTID(id_sel,
+					function);
+			err = HvCallXm_connectBusUnit(bus, sub_bus,
+					agent_id, 0);
+			if (err) {
+				if (err != 0x302)
+					printk(KERN_DEBUG
+						"connectBusUnit(%x, %x, %x) "
+						"== %x\n",
+						bus, sub_bus, agent_id, err);
+				continue;
+			}
+
+			err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
+					PCI_VENDOR_ID, &vendor_id);
+			if (err) {
+				printk(KERN_DEBUG
+					"ReadVendor(%x, %x, %x) == %x\n",
+					bus, sub_bus, agent_id, err);
+				continue;
+			}
+			err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
+					PCI_DEVICE_ID, &device_id);
+			if (err) {
+				printk(KERN_DEBUG
+					"ReadDevice(%x, %x, %x) == %x\n",
+					bus, sub_bus, agent_id, err);
+				continue;
+			}
+			err = HvCallPci_configLoad32(bus, sub_bus, agent_id,
+					PCI_CLASS_REVISION , &class_id);
+			if (err) {
+				printk(KERN_DEBUG
+					"ReadClass(%x, %x, %x) == %x\n",
+					bus, sub_bus, agent_id, err);
+				continue;
+			}
+
+			devfn = PCI_DEVFN(ISERIES_ENCODE_DEVICE(eads_id_sel),
+					function);
+			if (function == 0)
+				snprintf(buf, sizeof(buf), "pci@%x",
+						PCI_SLOT(devfn));
+			else
+				snprintf(buf, sizeof(buf), "pci@%x,%d",
+						PCI_SLOT(devfn), function);
+			dt_start_node(dt, buf);
+			reg[0] = (bus << 18) | (devfn << 8);
+			reg[1] = 0;
+			reg[2] = 0;
+			reg[3] = 0;
+			reg[4] = 0;
+			dt_prop_u32_list(dt, "reg", reg, 5);
+			dt_prop_u32(dt, "vendor-id", vendor_id);
+			dt_prop_u32(dt, "device-id", device_id);
+			dt_prop_u32(dt, "class-code", class_id >> 8);
+			dt_prop_u32(dt, "revision-id", class_id & 0xff);
+			dt_prop_u32(dt, "linux,subbus", sub_bus);
+			dt_prop_u32(dt, "linux,agent-id", agent_id);
+			dt_prop_u32(dt, "linux,logical-slot-number",
+					bridge_info->logicalSlotNumber);
+			dt_end_node(dt);
+
+		}
+	}
+}
+
+static void scan_bridge(struct iseries_flat_dt *dt, HvBusNumber bus,
+		HvSubBusNumber sub_bus, int id_sel)
+{
+	struct HvCallPci_BridgeInfo bridge_info;
+	HvAgentId agent_id;
+	int function;
+	int ret;
+
+	/* Note: hvSubBus and irq is always be 0 at this level! */
+	for (function = 0; function < 8; ++function) {
+		agent_id = ISERIES_PCI_AGENTID(id_sel, function);
+		ret = HvCallXm_connectBusUnit(bus, sub_bus, agent_id, 0);
+		if (ret != 0) {
+			if (ret != 0xb)
+				printk(KERN_DEBUG "connectBusUnit(%x, %x, %x) "
+						"== %x\n",
+						bus, sub_bus, agent_id, ret);
+			continue;
+		}
+		printk("found device at bus %d idsel %d func %d (AgentId %x)\n",
+				bus, id_sel, function, agent_id);
+		ret = HvCallPci_getBusUnitInfo(bus, sub_bus, agent_id,
+				iseries_hv_addr(&bridge_info),
+				sizeof(struct HvCallPci_BridgeInfo));
+		if (ret != 0)
+			continue;
+		printk("bridge info: type %x subbus %x "
+			"maxAgents %x maxsubbus %x logslot %x\n",
+			bridge_info.busUnitInfo.deviceType,
+			bridge_info.subBusNumber,
+			bridge_info.maxAgents,
+			bridge_info.maxSubBusNumber,
+			bridge_info.logicalSlotNumber);
+		if (bridge_info.busUnitInfo.deviceType ==
+				HvCallPci_BridgeDevice)
+			scan_bridge_slot(dt, bus, &bridge_info);
+		else
+			printk("PCI: Invalid Bridge Configuration(0x%02X)",
+				bridge_info.busUnitInfo.deviceType);
+	}
+}
+
+static void scan_phb(struct iseries_flat_dt *dt, HvBusNumber bus)
+{
+	struct HvCallPci_DeviceInfo dev_info;
+	const HvSubBusNumber sub_bus = 0;	/* EADs is always 0. */
+	int err;
+	int id_sel;
+	const int max_agents = 8;
+
+	/*
+	 * Probe for EADs Bridges
+	 */
+	for (id_sel = 1; id_sel < max_agents; ++id_sel) {
+		err = HvCallPci_getDeviceInfo(bus, sub_bus, id_sel,
+				iseries_hv_addr(&dev_info),
+				sizeof(struct HvCallPci_DeviceInfo));
+		if (err) {
+			if (err != 0x302)
+				printk(KERN_DEBUG "getDeviceInfo(%x, %x, %x) "
+						"== %x\n",
+						bus, sub_bus, id_sel, err);
+			continue;
+		}
+		if (dev_info.deviceType != HvCallPci_NodeDevice) {
+			printk(KERN_DEBUG "PCI: Invalid System Configuration"
+					"(0x%02X) for bus 0x%02x id 0x%02x.\n",
+					dev_info.deviceType, bus, id_sel);
+			continue;
+		}
+		scan_bridge(dt, bus, sub_bus, id_sel);
+	}
+}
+
+static void dt_pci_devices(struct iseries_flat_dt *dt)
+{
+	HvBusNumber bus;
+	char buf[32];
+	u32 buses[2];
+	int phb_num = 0;
+
+	/* Check all possible buses. */
+	for (bus = 0; bus < 256; bus++) {
+		int err = HvCallXm_testBus(bus);
+
+		if (err) {
+			/*
+			 * Check for Unexpected Return code, a clue that
+			 * something has gone wrong.
+			 */
+			if (err != 0x0301)
+				printk(KERN_ERR "Unexpected Return on Probe"
+						"(0x%02X): 0x%04X", bus, err);
+			continue;
+		}
+		printk("bus %d appears to exist\n", bus);
+		snprintf(buf, 32, "pci@%d", phb_num);
+		dt_start_node(dt, buf);
+		dt_prop_str(dt, "device_type", "pci");
+		dt_prop_str(dt, "compatible", "IBM,iSeries-Logical-PHB");
+		dt_prop_u32(dt, "#address-cells", 3);
+		dt_prop_u32(dt, "#size-cells", 2);
+		buses[0] = buses[1] = bus;
+		dt_prop_u32_list(dt, "bus-range", buses, 2);
+		scan_phb(dt, bus);
+		dt_end_node(dt);
+		phb_num++;
+	}
+}
+
 void build_flat_dt(struct iseries_flat_dt *dt, unsigned long phys_mem_size)
 {
 	u64 tmp[2];
@@ -1029,6 +1232,7 @@ void build_flat_dt(struct iseries_flat_dt *dt, unsigned long phys_mem_size)
 	dt_cpus(dt);
 
 	dt_vdevices(dt);
+	dt_pci_devices(dt);
 
 	dt_end_node(dt);