sh: Handle PCI controller resource conflicts.

register_pci_controller() can fail, but presently is a void function.
Change this over to an int so that we can bail early before continuing on
with post-registration initialization (such as throwing the controller in
to 66MHz mode in the case of the SH7780 host controller).

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/drivers/pci/pci-dreamcast.c

@@ -95,8 +95,6 @@ static int __init gapspci_init(void)
 	outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
 	outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
 
-	register_pci_controller(&dreamcast_pci_controller);
+	return register_pci_controller(&dreamcast_pci_controller);
-
-	return 0;
 }
 arch_initcall(gapspci_init);

arch/sh/drivers/pci/pci-sh5.c

@@ -216,8 +216,6 @@ static int __init sh5pci_init(void)
 	sh5_mem_resource.start = memStart;
 	sh5_mem_resource.end = memStart + memSize;
 
-	register_pci_controller(&sh5pci_controller);
+	return register_pci_controller(&sh5pci_controller);
-
-	return 0;
 }
 arch_initcall(sh5pci_init);

arch/sh/drivers/pci/pci-sh7751.c

@@ -176,8 +176,6 @@ static int __init sh7751_pci_init(void)
 	word = SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_ARBM;
 	pci_write_reg(chan, word, SH4_PCICR);
 
-	register_pci_controller(chan);
+	return register_pci_controller(chan);
-
-	return 0;
 }
 arch_initcall(sh7751_pci_init);

arch/sh/drivers/pci/pci-sh7780.c

@@ -71,6 +71,7 @@ static int __init sh7780_pci_init(void)
 	size_t memsize;
 	unsigned int id;
 	const char *type;
+	int ret;
 
 	printk(KERN_NOTICE "PCI: Starting intialization.\n");
 
@@ -197,7 +198,9 @@ static int __init sh7780_pci_init(void)
 	__raw_writel(SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_FTO,
 		     chan->reg_base + SH4_PCICR);
 
-	register_pci_controller(chan);
+	ret = register_pci_controller(chan);
+	if (unlikely(ret))
+		return ret;
 
 	sh7780_pci66_init(chan);
 

arch/sh/drivers/pci/pci.c

@@ -58,7 +58,7 @@ static void __devinit pcibios_scanbus(struct pci_channel *hose)
 
 static DEFINE_MUTEX(pci_scan_mutex);
 
-void __devinit register_pci_controller(struct pci_channel *hose)
+int __devinit register_pci_controller(struct pci_channel *hose)
 {
 	if (request_resource(&iomem_resource, hose->mem_resource) < 0)
 		goto out;
@@ -88,10 +88,11 @@ void __devinit register_pci_controller(struct pci_channel *hose)
 		mutex_unlock(&pci_scan_mutex);
 	}
 
-	return;
+	return 0;
 
 out:
 	printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n");
+	return -1;
 }
 
 static int __init pcibios_init(void)

arch/sh/drivers/pci/pcie-sh7786.c

@@ -296,9 +296,7 @@ static int __devinit sh7786_pcie_init_hw(struct sh7786_pcie_port *port)
 	if (unlikely(ret < 0))
 		return ret;
 
-	register_pci_controller(port->hose);
+	return register_pci_controller(port->hose);
-
-	return 0;
 }
 
 static struct sh7786_pcie_hwops sh7786_65nm_pcie_hwops __initdata = {

arch/sh/include/asm/pci.h

@@ -31,7 +31,7 @@ struct pci_channel {
 	unsigned int		need_domain_info;
 };
 
-extern void register_pci_controller(struct pci_channel *hose);
+extern int register_pci_controller(struct pci_channel *hose);
 extern int pci_is_66mhz_capable(struct pci_channel *hose,
 				int top_bus, int current_bus);