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| author | Cyrille Pitchen <cyrille.pitchen@free-electrons.com> | 2018-01-30 21:56:50 +0100 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2018-01-31 11:09:32 +0000 |
| commit | 3a8f77e48666a39adb3ac4d5ce8261563e039e31 (patch) | |
| tree | b5146ef9b6734451c1c246871d63d30808199658 /drivers/pci/of.c | |
| parent | 9de0eec29c07a65c21323f934d84ce164b0d9205 (diff) | |
| download | linux-3a8f77e48666a39adb3ac4d5ce8261563e039e31.tar.bz2 | |
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.c | 51 |
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; +} |