Further break-up-age

Make ACPI PCI IRQ routing work a bit better...

arch/i386/kernel/pci/Makefile

@@ -2,15 +2,22 @@ O_TARGET        := pci.o
 
 obj-y		:= dma.o i386.o
 
-ifdef CONFIG_VISWS
+ifdef	CONFIG_VISWS
 obj-y		+= visws.o
 else
-ifdef CONFIG_MULTIQUAD
+ifdef	CONFIG_MULTIQUAD
 obj-y		+= numa.o
 else
 obj-$(CONFIG_PCI_BIOS)		+= pcbios.o
 obj-$(CONFIG_PCI_DIRECT)	+= direct.o
 obj-y		+= fixup.o
+
+ifdef	CONFIG_ACPI_PCI
+obj-y		+= acpi.o
+else
+obj-y		+= legacy.o
+endif
+
 endif		# CONFIG_MULTIQUAD
 obj-y		+= irq.o common.o
 endif		# CONFIG_VISWS

arch/i386/kernel/pci/acpi.c

+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include "pci.h"
+
+extern void eisa_set_level_irq(int irq);
+
+static int acpi_lookup_irq (
+	struct pci_dev		*dev,
+	int			assign)
+{
+	int			result = 0;
+	int			irq = 0;
+	u8			pin;
+
+	/* TBD: Select IRQ from possible to improve routing performance. */
+
+	/* Find IRQ pin */
+	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
+	if (!pin) {
+		DBG(" -> no interrupt pin\n");
+		return 0;
+	}
+	pin = pin - 1;
+
+	result = acpi_prt_get_irq(dev, pin, &irq);
+	if (!irq)
+		result = -ENODEV;
+	if (0 != result) {
+		printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s\n",
+		       'A'+pin, dev->slot_name);
+		return result;
+	}
+
+	/* only check for the IRQ */
+	if (!assign) {
+		printk(KERN_INFO "PCI: Found IRQ %d for device %s\n", 
+		       irq, dev->slot_name);
+		return 1;
+	}
+
+	dev->irq = irq;
+
+	/* also assign an IRQ */
+	if (irq && (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
+		result = acpi_prt_set_irq(dev, pin, irq);
+		if (0 != result) {
+			printk(KERN_WARNING "PCI: Could not assign IRQ %d to device %s\n", irq, dev->slot_name);
+			return result;
+		}
+
+		eisa_set_level_irq(irq);
+
+		printk(KERN_INFO "PCI: Assigned IRQ %d for device %s\n", irq, dev->slot_name);
+	}
+
+	return 1;
+}
+
+static int __init pci_acpi_init(void)
+{
+	if (!(pci_probe & PCI_NO_ACPI_ROUTING)) {
+		printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
+		printk(KERN_INFO "PCI: if you experience problems, try using option 'pci=noacpi'\n");
+		pci_use_acpi_routing = 1;
+		pci_lookup_irq = acpi_lookup_irq;
+	}
+	return 0;
+}
+
+subsys_initcall(pci_acpi_init);

arch/i386/kernel/pci/common.c

@@ -4,12 +4,8 @@
  *	(c) 1999--2000 Martin Mares <mj@ucw.cz>
  */
 
-#include <linux/config.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/pci.h>
-#include <linux/init.h>
 #include <linux/ioport.h>
 
 #include <asm/segment.h>
@@ -90,37 +86,6 @@ static void __devinit pcibios_fixup_ghosts(struct pci_bus *b)
 	}
 }
 
-/*
- * Discover remaining PCI buses in case there are peer host bridges.
- * We use the number of last PCI bus provided by the PCI BIOS.
- */
-static void __devinit pcibios_fixup_peer_bridges(void)
-{
-	int n;
-	struct pci_bus bus;
-	struct pci_dev dev;
-	u16 l;
-
-	if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
-		return;
-	DBG("PCI: Peer bridge fixup\n");
-	for (n=0; n <= pcibios_last_bus; n++) {
-		if (pci_bus_exists(&pci_root_buses, n))
-			continue;
-		bus.number = n;
-		bus.ops = pci_root_ops;
-		dev.bus = &bus;
-		for(dev.devfn=0; dev.devfn<256; dev.devfn += 8)
-			if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) &&
-			    l != 0x0000 && l != 0xffff) {
-				DBG("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l);
-				printk("PCI: Discovered peer bus %02x\n", n);
-				pci_scan_bus(n, pci_root_ops, NULL);
-				break;
-			}
-	}
-}
-
 /*
  *  Called after each bus is probed, but before its children
  *  are examined.
@@ -158,15 +123,6 @@ static int __init pcibios_init(void)
 		return 0;
 	}
 
-	printk("PCI: Probing PCI hardware\n");
-	pci_root_bus = pcibios_scan_root(0);
-
-	pcibios_irq_init();
-
-	if (!pci_use_acpi_routing)
-		pcibios_fixup_peer_bridges();
-
-	pcibios_fixup_irqs();
 	pcibios_resource_survey();
 
 #ifdef CONFIG_PCI_BIOS

arch/i386/kernel/pci/irq.c

@@ -46,6 +46,8 @@ struct irq_router {
 	int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, int new);
 };
 
+int (*pci_lookup_irq)(struct pci_dev * dev, int assign) = NULL;
+
 /*
  *  Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
  */
@@ -116,7 +118,7 @@ static void __init pirq_peer_trick(void)
  *  Code for querying and setting of IRQ routes on various interrupt routers.
  */
 
-static void eisa_set_level_irq(unsigned int irq)
+void eisa_set_level_irq(unsigned int irq)
 {
 	unsigned char mask = 1 << (irq & 7);
 	unsigned int port = 0x4d0 + (irq >> 3);
@@ -556,54 +558,6 @@ static void pcibios_test_irq_handler(int irq, void *dev_id, struct pt_regs *regs
 {
 }
 
-#ifdef CONFIG_ACPI_PCI
-
-static int acpi_lookup_irq (
-	struct pci_dev		*dev,
-	u8			pin,
-	int			assign)
-{
-	int			result = 0;
-	int			irq = 0;
-
-	/* TBD: Select IRQ from possible to improve routing performance. */
-
-	result = acpi_prt_get_irq(dev, pin, &irq);
-	if (!irq)
-		result = -ENODEV;
-	if (0 != result) {
-		printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s\n",
-		       'A'+pin, dev->slot_name);
-		return result;
-	}
-
-	dev->irq = irq;
-
-	if (!assign) {
-		/* only check for the IRQ */
-		printk(KERN_INFO "PCI: Found IRQ %d for device %s\n", irq, 
-		       dev->slot_name);
-		return 1;
-	}
-
-	/* also assign an IRQ */
-	if (irq && (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
-		result = acpi_prt_set_irq(dev, pin, irq);
-		if (0 != result) {
-			printk(KERN_WARNING "PCI: Could not assign IRQ %d to device %s\n", irq, dev->slot_name);
-			return result;
-		}
-
-		eisa_set_level_irq(irq);
-
-		printk(KERN_INFO "PCI: Assigned IRQ %d for device %s\n", irq, dev->slot_name);
-	}
-
-	return 1;
-}
-
-#endif /* CONFIG_ACPI_PCI */
-
 static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
 {
 	u8 pin;
@@ -623,12 +577,6 @@ static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
 	}
 	pin = pin - 1;
 
-#ifdef CONFIG_ACPI_PCI
-	/* Use ACPI to lookup IRQ */
-	if (pci_use_acpi_routing)
-		return acpi_lookup_irq(dev, pin, assign);
-#endif
-
 	/* Find IRQ routing entry */
 
 	if (!pirq_table)
@@ -736,21 +684,12 @@ static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
 	return 1;
 }
 
-void __init pcibios_irq_init(void)
+static int __init pcibios_irq_init(void)
 {
 	DBG("PCI: IRQ init\n");
 
-#ifdef CONFIG_ACPI_PCI
-	if (!(pci_probe & PCI_NO_ACPI_ROUTING)) {
-		if (acpi_prts.count) {
-			printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
-			pci_use_acpi_routing = 1;
-			return;
-		}
-		else
-			printk(KERN_WARNING "PCI: Invalid ACPI-PCI IRQ routing table\n");
-	}
-#endif
+	if (pci_lookup_irq)
+		return 0;
 
 	pirq_table = pirq_find_routing_table();
 
@@ -771,8 +710,13 @@ void __init pcibios_irq_init(void)
 		if (io_apic_assign_pci_irqs)
 			pirq_table = NULL;
 	}
+	pci_lookup_irq = pcibios_lookup_irq;
+	pcibios_fixup_irqs();
+	return 0;
 }
 
+subsys_initcall(pcibios_irq_init);
+
 void __init pcibios_fixup_irqs(void)
 {
 	struct pci_dev *dev;
@@ -835,7 +779,7 @@ void __init pcibios_fixup_irqs(void)
 		 * Still no IRQ? Try to lookup one...
 		 */
 		if (pin && !dev->irq)
-			pcibios_lookup_irq(dev, 0);
+			pci_lookup_irq(dev, 0);
 	}
 }
 
@@ -852,7 +796,7 @@ void pcibios_enable_irq(struct pci_dev *dev)
 {
 	u8 pin;
 	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
-	if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
+	if (pin && !pci_lookup_irq(dev, 1) && !dev->irq) {
 		char *msg;
 		if (io_apic_assign_pci_irqs)
 			msg = " Probably buggy MP table.";

arch/i386/kernel/pci/legacy.c

+/*
+ * legacy.c - traditional, old school PCI bus probing
+ */
+#include <linux/pci.h>
+#include "pci.h"
+
+/*
+ * Discover remaining PCI buses in case there are peer host bridges.
+ * We use the number of last PCI bus provided by the PCI BIOS.
+ */
+static void __devinit pcibios_fixup_peer_bridges(void)
+{
+	int n;
+	struct pci_bus bus;
+	struct pci_dev dev;
+	u16 l;
+
+	if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
+		return;
+	DBG("PCI: Peer bridge fixup\n");
+	for (n=0; n <= pcibios_last_bus; n++) {
+		if (pci_bus_exists(&pci_root_buses, n))
+			continue;
+		bus.number = n;
+		bus.ops = pci_root_ops;
+		dev.bus = &bus;
+		for(dev.devfn=0; dev.devfn<256; dev.devfn += 8)
+			if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) &&
+			    l != 0x0000 && l != 0xffff) {
+				DBG("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l);
+				printk("PCI: Discovered peer bus %02x\n", n);
+				pci_scan_bus(n, pci_root_ops, NULL);
+				break;
+			}
+	}
+}
+
+static int __init pci_legacy_init(void)
+{
+	if (!pci_root_ops) {
+		printk("PCI: System does not support PCI\n");
+		return 0;
+	}
+
+	printk("PCI: Probing PCI hardware\n");
+	pci_root_bus = pcibios_scan_root(0);
+
+	if (!pci_use_acpi_routing)
+		pcibios_fixup_peer_bridges();
+	return 0;
+}
+
+subsys_initcall(pci_legacy_init);

arch/i386/kernel/pci/numa.c

@@ -12,7 +12,7 @@
 #define PCI_CONF1_ADDRESS(bus, dev, fn, reg) \
 	(0x80000000 | (BUS2LOCAL(bus) << 16) | (dev << 11) | (fn << 8) | (reg & ~3))
 
-static int pci_conf1_read (int seg, int bus, int dev, int fn, int reg, int len, u32 *value) /* CONFIG_MULTIQUAD */
+static int pci_conf1_read (int seg, int bus, int dev, int fn, int reg, int len, u32 *value)
 {
 	unsigned long flags;
 
@@ -40,7 +40,7 @@ static int pci_conf1_read (int seg, int bus, int dev, int fn, int reg, int len,
 	return 0;
 }
 
-static int pci_conf1_write (int seg, int bus, int dev, int fn, int reg, int len, u32 value) /* CONFIG_MULTIQUAD */
+static int pci_conf1_write (int seg, int bus, int dev, int fn, int reg, int len, u32 value)
 {
 	unsigned long flags;
 

arch/i386/kernel/pci/pci.h

@@ -4,7 +4,7 @@
  *	(c) 1999 Martin Mares <mj@ucw.cz>
  */
 
-#undef DEBUG
+#define DEBUG
 
 #ifdef DEBUG
 #define DBG(x...) printk(x)
@@ -69,6 +69,7 @@ extern unsigned int pcibios_irq_mask;
 extern int pci_use_acpi_routing;
 extern spinlock_t pci_config_lock;
 
-void pcibios_irq_init(void);
 void pcibios_fixup_irqs(void);
 void pcibios_enable_irq(struct pci_dev *dev);
+
+extern int (*pci_lookup_irq)(struct pci_dev * dev, int assign);

drivers/acpi/acpi_osl.c

@@ -77,12 +77,13 @@ acpi_os_initialize(void)
 	 * Initialize PCI configuration space access, as we'll need to access
 	 * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 	 */
+#if 0
 	pcibios_config_init();
 	if (!pci_config_read || !pci_config_write) {
 		printk(KERN_ERR PREFIX "Access to PCI configuration space unavailable\n");
 		return AE_NULL_ENTRY;
 	}
-
+#endif
 	return AE_OK;
 }