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authorCyrille Pitchen <cyrille.pitchen@free-electrons.com>2018-01-30 23:56:50 +0300
committerLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2018-01-31 14:09:32 +0300
commit3a8f77e48666a39adb3ac4d5ce8261563e039e31 (patch)
treeb5146ef9b6734451c1c246871d63d30808199658 /drivers/pci/of.c
parent9de0eec29c07a65c21323f934d84ce164b0d9205 (diff)
downloadlinux-3a8f77e48666a39adb3ac4d5ce8261563e039e31.tar.xz
PCI: OF: Add generic function to parse and allocate PCI resources
The patch moves the gen_pci_parse_request_of_pci_ranges() function from drivers/pci/host/pci-host-common.c into drivers/pci/of.c to easily share common source code between PCI host drivers. Signed-off-by: Cyrille Pitchen <cyrille.pitchen@free-electrons.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Diffstat (limited to 'drivers/pci/of.c')
-rw-r--r--drivers/pci/of.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index e112da11630e..54e210501b73 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -88,3 +88,54 @@ struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
return NULL;
#endif
}
+
+int pci_parse_request_of_pci_ranges(struct device *dev,
+ struct list_head *resources,
+ struct resource **bus_range)
+{
+ int err, res_valid = 0;
+ struct device_node *np = dev->of_node;
+ resource_size_t iobase;
+ struct resource_entry *win, *tmp;
+
+ INIT_LIST_HEAD(resources);
+ err = of_pci_get_host_bridge_resources(np, 0, 0xff, resources, &iobase);
+ if (err)
+ return err;
+
+ err = devm_request_pci_bus_resources(dev, resources);
+ if (err)
+ goto out_release_res;
+
+ resource_list_for_each_entry_safe(win, tmp, resources) {
+ struct resource *res = win->res;
+
+ switch (resource_type(res)) {
+ case IORESOURCE_IO:
+ err = pci_remap_iospace(res, iobase);
+ if (err) {
+ dev_warn(dev, "error %d: failed to map resource %pR\n",
+ err, res);
+ resource_list_destroy_entry(win);
+ }
+ break;
+ case IORESOURCE_MEM:
+ res_valid |= !(res->flags & IORESOURCE_PREFETCH);
+ break;
+ case IORESOURCE_BUS:
+ if (bus_range)
+ *bus_range = res;
+ break;
+ }
+ }
+
+ if (res_valid)
+ return 0;
+
+ dev_err(dev, "non-prefetchable memory resource required\n");
+ err = -EINVAL;
+
+ out_release_res:
+ pci_free_resource_list(resources);
+ return err;
+}