sh: Improved multi-resource handling for SH7780 PCI.

The SH7780 PCI controller supports 3 different ranges of PCI memory in
addition to its PCI I/O window. In the case of 29-bit mode, only 2 memory
windows are supported, while in 32-bit mode all 3 are visible. This
attempts to make the resource handling completely dynamic and to permit
platforms to map in as many apertures as they can handle.

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

1 files changed, 23 insertions, 14 deletions

diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
index 8e42dfbbe76..f4a69833fce 100644
--- a/arch/sh/drivers/pci/pci.c
+++ b/arch/sh/drivers/pci/pci.c
@@ -60,11 +60,18 @@ static DEFINE_MUTEX(pci_scan_mutex);
 
 int __devinit register_pci_controller(struct pci_channel *hose)
 {
-	if (request_resource(&iomem_resource, hose->mem_resource) < 0)
-		goto out;
-	if (request_resource(&ioport_resource, hose->io_resource) < 0) {
-		release_resource(hose->mem_resource);
-		goto out;
+	int i;
+
+	for (i = 0; i < hose->nr_resources; i++) {
+		struct resource *res = hose->resources + i;
+
+		if (res->flags & IORESOURCE_IO) {
+			if (request_resource(&ioport_resource, res) < 0)
+				goto out;
+		} else {
+			if (request_resource(&iomem_resource, res) < 0)
+				goto out;
+		}
 	}
 
 	*hose_tail = hose;
@@ -96,6 +103,9 @@ int __devinit register_pci_controller(struct pci_channel *hose)
 	return 0;
 
 out:
+	for (--i; i >= 0; i--)
+		release_resource(&hose->resources[i]);
+
 	printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n");
 	return -1;
 }
@@ -149,11 +159,13 @@ void __devinit pcibios_fixup_bus(struct pci_bus *bus)
 {
 	struct pci_dev *dev = bus->self;
 	struct list_head *ln;
-	struct pci_channel *chan = bus->sysdata;
+	struct pci_channel *hose = bus->sysdata;
 
 	if (!dev) {
-		bus->resource[0] = chan->io_resource;
-		bus->resource[1] = chan->mem_resource;
+		int i;
+
+		for (i = 0; i < hose->nr_resources; i++)
+			bus->resource[i] = hose->resources + i;
 	}
 
 	for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
@@ -174,21 +186,18 @@ void pcibios_align_resource(void *data, struct resource *res,
 			    resource_size_t size, resource_size_t align)
 {
 	struct pci_dev *dev = data;
-	struct pci_channel *chan = dev->sysdata;
+	struct pci_channel *hose = dev->sysdata;
 	resource_size_t start = res->start;
 
 	if (res->flags & IORESOURCE_IO) {
-		if (start < PCIBIOS_MIN_IO + chan->io_resource->start)
-			start = PCIBIOS_MIN_IO + chan->io_resource->start;
+		if (start < PCIBIOS_MIN_IO + hose->resources[0].start)
+			start = PCIBIOS_MIN_IO + hose->resources[0].start;
 
 		/*
                  * Put everything into 0x00-0xff region modulo 0x400.
 		 */
 		if (start & 0x300)
 			start = (start + 0x3ff) & ~0x3ff;
-	} else if (res->flags & IORESOURCE_MEM) {
-		if (start < PCIBIOS_MIN_MEM + chan->mem_resource->start)
-			start = PCIBIOS_MIN_MEM + chan->mem_resource->start;
 	}
 
 	res->start = start;