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 <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;
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
>
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