of_device_common.c

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#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/mod_devicetable.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>

#include "of_device_common.h"

unsigned int irq_of_parse_and_map(struct device_node *node, int index)
{
    struct platform_device *op = of_find_device_by_node(node);

    if (!op || index >= op->archdata.num_irqs)
        return 0;

    return op->archdata.irqs[index];
}
EXPORT_SYMBOL(irq_of_parse_and_map);

int of_address_to_resource(struct device_node *node, int index,
               struct resource *r)
{
    struct platform_device *op = of_find_device_by_node(node);

    if (!op || index >= op->num_resources)
        return -EINVAL;

    memcpy(r, &op->archdata.resource[index], sizeof(*r));
    return 0;
}
EXPORT_SYMBOL_GPL(of_address_to_resource);

void __iomem *of_iomap(struct device_node *node, int index)
{
    struct platform_device *op = of_find_device_by_node(node);
    struct resource *r;

    if (!op || index >= op->num_resources)
        return NULL;

    r = &op->archdata.resource[index];

    return of_ioremap(r, 0, resource_size(r), (char *) r->name);
}
EXPORT_SYMBOL(of_iomap);

/* Take the archdata values for IOMMU, STC, and HOSTDATA found in
 * BUS and propagate to all child platform_device objects.
 */
void of_propagate_archdata(struct platform_device *bus)
{
    struct dev_archdata *bus_sd = &bus->dev.archdata;
    struct device_node *bus_dp = bus->dev.of_node;
    struct device_node *dp;

    for (dp = bus_dp->child; dp; dp = dp->sibling) {
        struct platform_device *op = of_find_device_by_node(dp);

        op->dev.archdata.iommu = bus_sd->iommu;
        op->dev.archdata.stc = bus_sd->stc;
        op->dev.archdata.host_controller = bus_sd->host_controller;
        op->dev.archdata.numa_node = bus_sd->numa_node;

        if (dp->child)
            of_propagate_archdata(op);
    }
}

static void get_cells(struct device_node *dp, int *addrc, int *sizec)
{
    if (addrc)
        *addrc = of_n_addr_cells(dp);
    if (sizec)
        *sizec = of_n_size_cells(dp);
}

/*
 * Default translator (generic bus)
 */

void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
{
    get_cells(dev, addrc, sizec);
}

/* Make sure the least significant 64-bits are in-range.  Even
 * for 3 or 4 cell values it is a good enough approximation.
 */
int of_out_of_range(const u32 *addr, const u32 *base,
            const u32 *size, int na, int ns)
{
    u64 a = of_read_addr(addr, na);
    u64 b = of_read_addr(base, na);

    if (a < b)
        return 1;

    b += of_read_addr(size, ns);
    if (a >= b)
        return 1;

    return 0;
}

int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
{
    u32 result[OF_MAX_ADDR_CELLS];
    int i;

    if (ns > 2) {
        printk("of_device: Cannot handle size cells (%d) > 2.", ns);
        return -EINVAL;
    }

    if (of_out_of_range(addr, range, range + na + pna, na, ns))
        return -EINVAL;

    /* Start with the parent range base.  */
    memcpy(result, range + na, pna * 4);

    /* Add in the child address offset.  */
    for (i = 0; i < na; i++)
        result[pna - 1 - i] +=
            (addr[na - 1 - i] -
             range[na - 1 - i]);

    memcpy(addr, result, pna * 4);

    return 0;
}

unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
{
    if (flags)
        return flags;
    return IORESOURCE_MEM;
}

/*
 * SBUS bus specific translator
 */

int of_bus_sbus_match(struct device_node *np)
{
    struct device_node *dp = np;

    while (dp) {
        if (!strcmp(dp->name, "sbus") ||
            !strcmp(dp->name, "sbi"))
            return 1;

        /* Have a look at use_1to1_mapping().  We're trying
         * to match SBUS if that's the top-level bus and we
         * don't have some intervening real bus that provides
         * ranges based translations.
         */
        if (of_find_property(dp, "ranges", NULL) != NULL)
            break;

        dp = dp->parent;
    }

    return 0;
}

void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
{
    if (addrc)
        *addrc = 2;
    if (sizec)
        *sizec = 1;
}