This new function parses the ranges property of PCI device nodes into
an array of struct resource elements. It is useful in multiple-port PCI
host controller drivers to collect information about the ranges that it
needs to forward to the respective ports.
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
---
Changes in v3:
- new patch
drivers/of/of_pci.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++-
include/linux/of_pci.h | 2 ++
2 files changed, 85 insertions(+), 1 deletion(-)
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 13e37e2..bcff301 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -1,7 +1,8 @@
#include <linux/kernel.h>
#include <linux/export.h>
-#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/of_pci.h>
+#include <linux/slab.h>
#include <asm/prom.h>
static inline int __of_pci_pci_compare(struct device_node *node,
@@ -40,3 +41,84 @@ struct device_node *of_pci_find_child_device(struct device_node *parent,
return NULL;
}
EXPORT_SYMBOL_GPL(of_pci_find_child_device);
+
+struct resource *of_pci_parse_ranges(struct device_node *node,
+ unsigned int *countp)
+{
+ unsigned int count, i = 0;
+ struct resource *ranges;
+ const __be32 *values;
+ int len, pna, np;
+
+ values = of_get_property(node, "ranges", &len);
+ if (!values)
+ return NULL;
+
+ pna = of_n_addr_cells(node);
+ np = pna + 5;
+
+ count = len / (np * sizeof(*values));
+
+ ranges = kzalloc(sizeof(*ranges) * count, GFP_KERNEL);
+ if (!ranges)
+ return NULL;
+
+ pr_debug("PCI ranges:\n");
+
+ while ((len -= np * sizeof(*values)) >= 0) {
+ u64 addr = of_translate_address(node, values + 3);
+ u64 size = of_read_number(values + 3 + pna, 2);
+ u32 type = be32_to_cpup(values);
+ const char *suffix = "";
+ struct resource range;
+
+ memset(&range, 0, sizeof(range));
+ range.start = addr;
+ range.end = addr + size - 1;
+
+ switch ((type >> 24) & 0x3) {
+ case 0:
+ range.flags = IORESOURCE_MEM | IORESOURCE_PCI_CS;
+ pr_debug(" CS %#x-%#x\n", range.start, range.end);
+ break;
+
+ case 1:
+ range.flags = IORESOURCE_IO;
+ pr_debug(" IO %#x-%#x\n", range.start, range.end);
+ break;
+
+ case 2:
+ range.flags = IORESOURCE_MEM;
+
+ if (type & 0x40000000) {
+ range.flags |= IORESOURCE_PREFETCH;
+ suffix = "prefetch";
+ }
+
+ pr_debug(" MEM %#x-%#x %s\n", range.start, range.end,
+ suffix);
+ break;
+
+ case 3:
+ range.flags = IORESOURCE_MEM | IORESOURCE_MEM_64;
+
+ if (type & 0x40000000) {
+ range.flags |= IORESOURCE_PREFETCH;
+ suffix = "prefetch";
+ }
+
+ pr_debug(" MEM %#x-%#x 64-bit %s\n", range.start,
+ range.end, suffix);
+ break;
+ }
+
+ memcpy(&ranges[i++], &range, sizeof(range));
+ values += np;
+ }
+
+ if (countp)
+ *countp = count;
+
+ return ranges;
+}
+EXPORT_SYMBOL_GPL(of_pci_parse_ranges);
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index bb115de..c0db6ea 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -10,5 +10,7 @@ int of_irq_map_pci(const struct pci_dev *pdev, struct of_irq *out_irq);
struct device_node;
struct device_node *of_pci_find_child_device(struct device_node *parent,
unsigned int devfn);
+struct resource *of_pci_parse_ranges(struct device_node *node,
+ unsigned int *countp);
#endif
--
1.7.11.2
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