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Subject[PATCH v5 02/11] PCI: OF: Add generic function to parse and allocate PCI resources
Date
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>
---
drivers/pci/host/pci-host-common.c | 49 ++----------------------------------
drivers/pci/of.c | 51 ++++++++++++++++++++++++++++++++++++++
include/linux/pci.h | 9 +++++++
3 files changed, 62 insertions(+), 47 deletions(-)

diff --git a/drivers/pci/host/pci-host-common.c b/drivers/pci/host/pci-host-common.c
index c4b891c84703..a613ea310e76 100644
--- a/drivers/pci/host/pci-host-common.c
+++ b/drivers/pci/host/pci-host-common.c
@@ -24,50 +24,6 @@
#include <linux/pci-ecam.h>
#include <linux/platform_device.h>

-static int gen_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;
-
- 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)
- return err;
-
- 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:
- *bus_range = res;
- break;
- }
- }
-
- if (res_valid)
- return 0;
-
- dev_err(dev, "non-prefetchable memory resource required\n");
- return -EINVAL;
-}
-
static void gen_pci_unmap_cfg(void *ptr)
{
pci_ecam_free((struct pci_config_window *)ptr);
@@ -82,9 +38,9 @@ static struct pci_config_window *gen_pci_init(struct device *dev,
struct pci_config_window *cfg;

/* Parse our PCI ranges and request their resources */
- err = gen_pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
+ err = pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
if (err)
- goto err_out;
+ return ERR_PTR(err);

err = of_address_to_resource(dev->of_node, 0, &cfgres);
if (err) {
@@ -135,7 +91,6 @@ int pci_host_common_probe(struct platform_device *pdev,
of_pci_check_probe_only();

/* Parse and map our Configuration Space windows */
- INIT_LIST_HEAD(&resources);
cfg = gen_pci_init(dev, &resources, ops);
if (IS_ERR(cfg))
return PTR_ERR(cfg);
diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index e81835bdf4fa..e1e37d020b4c 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -598,3 +598,54 @@ int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin)
}
EXPORT_SYMBOL_GPL(of_irq_parse_and_map_pci);
#endif /* CONFIG_OF_IRQ */
+
+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;
+}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index a1e10ba7b612..3b1cfa5dd512 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2171,6 +2171,9 @@ void pci_release_of_node(struct pci_dev *dev);
void pci_set_bus_of_node(struct pci_bus *bus);
void pci_release_bus_of_node(struct pci_bus *bus);
struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus);
+int pci_parse_request_of_pci_ranges(struct device *dev,
+ struct list_head *resources,
+ struct resource **bus_range);

/* Arch may override this (weak) */
struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus);
@@ -2195,6 +2198,12 @@ static inline struct device_node *
pci_device_to_OF_node(const struct pci_dev *pdev) { return NULL; }
static inline struct irq_domain *
pci_host_bridge_of_msi_domain(struct pci_bus *bus) { return NULL; }
+static inline int pci_parse_request_of_pci_ranges(struct device *dev,
+ struct list_head *resources,
+ struct resource **bus_range)
+{
+ return -EINVAL;
+}
#endif /* CONFIG_OF */

#ifdef CONFIG_ACPI
--
2.11.0
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