On 07/26/2012 02:55 PM, Thierry Reding wrote: > 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.
It seems to me that some of the DT PCI code in arch/powerpc/kernel/pci* like pci_process_bridge_OF_ranges() should apply for ARM as well. Each arch defining their own pci controller structs complicates this, but I would think at least the DT parsing can be common. > Signed-off-by: Thierry Reding <[email protected]> > --- > 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; I think res or pci_res would be clearer than ranges that this is a struct resource. > + 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; Same here. Rob > + > + 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 > _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
