[PATCH]

[Kumar Gala <galak@kernel.crashing.org>]

PCI: Add pci_assign_resource_fixed -- allow fixed address assignments

On some embedded systems the PCI address for hotplug devices are not only
known a priori but are required to be at a given PCI address for other
master in the system to be able to access.

An example of such a system would be an FPGA which is setup from user space
after the system has booted.  The FPGA may be access by DSPs in the system
and those DSPs expect the FPGA at a fixed PCI address.

Added pci_assign_resource_fixed() as a way to allow assignment of the PCI
devices's BARs at fixed PCI addresses.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

---
commit 45d4a23317c459865ec740c80b6e2a2ad9f53fd3
tree 432b5e41ef5f231dd57eb1a98f103239c62d63a0
parent 8176dee014ec6ad1039b8c0075c9c1d02147c2c8
author Kumar Gala <galak@kernel.crashing.org> Thu, 09 Mar 2006 12:34:25 -0600
committer Kumar Gala <galak@kernel.crashing.org> Thu, 09 Mar 2006 12:34:25 -0600

 drivers/pci/pci.c       |    1 +
 drivers/pci/setup-res.c |   35 +++++++++++++++++++++++++++++++++++
 include/linux/pci.h     |    1 +
 3 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d2d1879..2557e86 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -935,6 +935,7 @@ EXPORT_SYMBOL_GPL(pci_intx);
 EXPORT_SYMBOL(pci_set_dma_mask);
 EXPORT_SYMBOL(pci_set_consistent_dma_mask);
 EXPORT_SYMBOL(pci_assign_resource);
+EXPORT_SYMBOL(pci_assign_resource_fixed);
 EXPORT_SYMBOL(pci_find_parent_resource);
 
 EXPORT_SYMBOL(pci_set_power_state);
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index ea9277b..f485958 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -155,6 +155,41 @@ int pci_assign_resource(struct pci_dev *
 	return ret;
 }
 
+int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
+{
+	struct pci_bus *bus = dev->bus;
+	struct resource *res = dev->resource + resno;
+	unsigned int type_mask;
+	int i, ret = -EBUSY;
+
+	type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
+
+	for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
+		struct resource *r = bus->resource[i];
+		if (!r)
+			continue;
+
+		/* type_mask must match */
+		if ((res->flags ^ r->flags) & type_mask)
+			continue;
+
+		ret = request_resource(r, res);
+
+		if (ret == 0)
+			break;
+	}
+
+	if (ret) {
+		printk(KERN_ERR "PCI: Failed to allocate %s resource #%d:%lx@%lx for %s\n",
+		       res->flags & IORESOURCE_IO ? "I/O" : "mem",
+		       resno, res->end - res->start + 1, res->start, pci_name(dev));
+	} else if (resno < PCI_BRIDGE_RESOURCES) {
+		pci_update_resource(dev, res, resno);
+	}
+
+	return ret;
+}
+
 /* Sort resources by alignment */
 void __devinit
 pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index fe1a2b0..0db1e2d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -460,6 +460,7 @@ int pci_set_dma_mask(struct pci_dev *dev
 int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask);
 void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno);
 int pci_assign_resource(struct pci_dev *dev, int i);
+int pci_assign_resource_fixed(struct pci_dev *dev, int i);
 void pci_restore_bars(struct pci_dev *dev);
 
 /* ROM control related routines */


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