[SPARC/64] Rename some functions like PowerPC

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sparc64 / kernel / of_device.c

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>

#include <asm/errno.h>
#include <asm/of_device.h>

static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
{
        struct of_device * of_dev = to_of_device(dev);
        struct of_platform_driver * of_drv = to_of_platform_driver(drv);
        const struct of_device_id * matches = of_drv->match_table;

        if (!matches)
                return 0;

        return of_match_device(matches, of_dev) != NULL;
}

static int of_platform_device_probe(struct device *dev)
{
        int error = -ENODEV;
        struct of_platform_driver *drv;
        struct of_device *of_dev;
        const struct of_device_id *match;

        drv = to_of_platform_driver(dev->driver);
        of_dev = to_of_device(dev);

        if (!drv->probe)
                return error;

        of_dev_get(of_dev);

        match = of_match_device(drv->match_table, of_dev);
        if (match)
                error = drv->probe(of_dev, match);
        if (error)
                of_dev_put(of_dev);

        return error;
}

static int of_platform_device_remove(struct device *dev)
{
        struct of_device * of_dev = to_of_device(dev);
        struct of_platform_driver * drv = to_of_platform_driver(dev->driver);

        if (dev->driver && drv->remove)
                drv->remove(of_dev);
        return 0;
}

static int of_platform_device_suspend(struct device *dev, pm_message_t state)
{
        struct of_device * of_dev = to_of_device(dev);
        struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
        int error = 0;

        if (dev->driver && drv->suspend)
                error = drv->suspend(of_dev, state);
        return error;
}

static int of_platform_device_resume(struct device * dev)
{
        struct of_device * of_dev = to_of_device(dev);
        struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
        int error = 0;

        if (dev->driver && drv->resume)
                error = drv->resume(of_dev);
        return error;
}

void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
{
        unsigned long ret = res->start + offset;
        struct resource *r;

        if (res->flags & IORESOURCE_MEM)
                r = request_mem_region(ret, size, name);
        else
                r = request_region(ret, size, name);
        if (!r)
                ret = 0;

        return (void __iomem *) ret;
}
EXPORT_SYMBOL(of_ioremap);

void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
{
        if (res->flags & IORESOURCE_MEM)
                release_mem_region((unsigned long) base, size);
        else
                release_region((unsigned long) base, size);
}
EXPORT_SYMBOL(of_iounmap);

static int node_match(struct device *dev, void *data)
{
        struct of_device *op = to_of_device(dev);
        struct device_node *dp = data;

        return (op->node == dp);
}

struct of_device *of_find_device_by_node(struct device_node *dp)
{
        struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
                                             dp, node_match);

        if (dev)
                return to_of_device(dev);

        return NULL;
}
EXPORT_SYMBOL(of_find_device_by_node);

#ifdef CONFIG_PCI
struct bus_type isa_bus_type = {
       .name    = "isa",
       .match   = of_platform_bus_match,
       .probe   = of_platform_device_probe,
       .remove  = of_platform_device_remove,
       .suspend = of_platform_device_suspend,
       .resume  = of_platform_device_resume,
};
EXPORT_SYMBOL(isa_bus_type);

struct bus_type ebus_bus_type = {
       .name    = "ebus",
       .match   = of_platform_bus_match,
       .probe   = of_platform_device_probe,
       .remove  = of_platform_device_remove,
       .suspend = of_platform_device_suspend,
       .resume  = of_platform_device_resume,
};
EXPORT_SYMBOL(ebus_bus_type);
#endif

#ifdef CONFIG_SBUS
struct bus_type sbus_bus_type = {
       .name    = "sbus",
       .match   = of_platform_bus_match,
       .probe   = of_platform_device_probe,
       .remove  = of_platform_device_remove,
       .suspend = of_platform_device_suspend,
       .resume  = of_platform_device_resume,
};
EXPORT_SYMBOL(sbus_bus_type);
#endif

struct bus_type of_platform_bus_type = {
       .name    = "of",
       .match   = of_platform_bus_match,
       .probe   = of_platform_device_probe,
       .remove  = of_platform_device_remove,
       .suspend = of_platform_device_suspend,
       .resume  = of_platform_device_resume,
};
EXPORT_SYMBOL(of_platform_bus_type);

static inline u64 of_read_addr(const u32 *cell, int size)
{
        u64 r = 0;
        while (size--)
                r = (r << 32) | *(cell++);
        return r;
}

static void __init 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);
}

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS       4

struct of_bus {
        const char      *name;
        const char      *addr_prop_name;
        int             (*match)(struct device_node *parent);
        void            (*count_cells)(struct device_node *child,
                                       int *addrc, int *sizec);
        int             (*map)(u32 *addr, const u32 *range,
                               int na, int ns, int pna);
        unsigned int    (*get_flags)(const u32 *addr);
};

/*
 * Default translator (generic bus)
 */

static 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.
 */
static 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;
}

static 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;
}

static unsigned int of_bus_default_get_flags(const u32 *addr)
{
        return IORESOURCE_MEM;
}

/*
 * PCI bus specific translator
 */

static int of_bus_pci_match(struct device_node *np)
{
        if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
                const char *model = of_get_property(np, "model", NULL);

                if (model && !strcmp(model, "SUNW,simba"))
                        return 0;

                /* Do not do PCI specific frobbing if the
                 * PCI bridge lacks a ranges property.  We
                 * want to pass it through up to the next
                 * parent as-is, not with the PCI translate
                 * method which chops off the top address cell.
                 */
                if (!of_find_property(np, "ranges", NULL))
                        return 0;

                return 1;
        }

        return 0;
}

static int of_bus_simba_match(struct device_node *np)
{
        const char *model = of_get_property(np, "model", NULL);

        if (model && !strcmp(model, "SUNW,simba"))
                return 1;

        /* Treat PCI busses lacking ranges property just like
         * simba.
         */
        if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
                if (!of_find_property(np, "ranges", NULL))
                        return 1;
        }

        return 0;
}

static int of_bus_simba_map(u32 *addr, const u32 *range,
                            int na, int ns, int pna)
{
        return 0;
}

static void of_bus_pci_count_cells(struct device_node *np,
                                   int *addrc, int *sizec)
{
        if (addrc)
                *addrc = 3;
        if (sizec)
                *sizec = 2;
}

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

        /* Check address type match */
        if ((addr[0] ^ range[0]) & 0x03000000)
                return -EINVAL;

        if (of_out_of_range(addr + 1, range + 1, range + na + pna,
                            na - 1, ns))
                return -EINVAL;

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

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

        memcpy(addr, result, pna * 4);

        return 0;
}

static unsigned int of_bus_pci_get_flags(const u32 *addr)
{
        unsigned int flags = 0;
        u32 w = addr[0];

        switch((w >> 24) & 0x03) {
        case 0x01:
                flags |= IORESOURCE_IO;
        case 0x02: /* 32 bits */
        case 0x03: /* 64 bits */
                flags |= IORESOURCE_MEM;
        }
        if (w & 0x40000000)
                flags |= IORESOURCE_PREFETCH;
        return flags;
}

/*
 * SBUS bus specific translator
 */

static int of_bus_sbus_match(struct device_node *np)
{
        return !strcmp(np->name, "sbus") ||
                !strcmp(np->name, "sbi");
}

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

/*
 * FHC/Central bus specific translator.
 *
 * This is just needed to hard-code the address and size cell
 * counts.  'fhc' and 'central' nodes lack the #address-cells and
 * #size-cells properties, and if you walk to the root on such
 * Enterprise boxes all you'll get is a #size-cells of 2 which is
 * not what we want to use.
 */
static int of_bus_fhc_match(struct device_node *np)
{
        return !strcmp(np->name, "fhc") ||
                !strcmp(np->name, "central");
}

#define of_bus_fhc_count_cells of_bus_sbus_count_cells

/*
 * Array of bus specific translators
 */

static struct of_bus of_busses[] = {
        /* PCI */
        {
                .name = "pci",
                .addr_prop_name = "assigned-addresses",
                .match = of_bus_pci_match,
                .count_cells = of_bus_pci_count_cells,
                .map = of_bus_pci_map,
                .get_flags = of_bus_pci_get_flags,
        },
        /* SIMBA */
        {
                .name = "simba",
                .addr_prop_name = "assigned-addresses",
                .match = of_bus_simba_match,
                .count_cells = of_bus_pci_count_cells,
                .map = of_bus_simba_map,
                .get_flags = of_bus_pci_get_flags,
        },
        /* SBUS */
        {
                .name = "sbus",
                .addr_prop_name = "reg",
                .match = of_bus_sbus_match,
                .count_cells = of_bus_sbus_count_cells,
                .map = of_bus_default_map,
                .get_flags = of_bus_default_get_flags,
        },
        /* FHC */
        {
                .name = "fhc",
                .addr_prop_name = "reg",
                .match = of_bus_fhc_match,
                .count_cells = of_bus_fhc_count_cells,
                .map = of_bus_default_map,
                .get_flags = of_bus_default_get_flags,
        },
        /* Default */
        {
                .name = "default",
                .addr_prop_name = "reg",
                .match = NULL,
                .count_cells = of_bus_default_count_cells,
                .map = of_bus_default_map,
                .get_flags = of_bus_default_get_flags,
        },
};

static struct of_bus *of_match_bus(struct device_node *np)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
                if (!of_busses[i].match || of_busses[i].match(np))
                        return &of_busses[i];
        BUG();
        return NULL;
}

static int __init build_one_resource(struct device_node *parent,
                                     struct of_bus *bus,
                                     struct of_bus *pbus,
                                     u32 *addr,
                                     int na, int ns, int pna)
{
        const u32 *ranges;
        unsigned int rlen;
        int rone;

        ranges = of_get_property(parent, "ranges", &rlen);
        if (ranges == NULL || rlen == 0) {
                u32 result[OF_MAX_ADDR_CELLS];
                int i;

                memset(result, 0, pna * 4);
                for (i = 0; i < na; i++)
                        result[pna - 1 - i] =
                                addr[na - 1 - i];

                memcpy(addr, result, pna * 4);
                return 0;
        }

        /* Now walk through the ranges */
        rlen /= 4;
        rone = na + pna + ns;
        for (; rlen >= rone; rlen -= rone, ranges += rone) {
                if (!bus->map(addr, ranges, na, ns, pna))
                        return 0;
        }

        /* When we miss an I/O space match on PCI, just pass it up
         * to the next PCI bridge and/or controller.
         */
        if (!strcmp(bus->name, "pci") &&
            (addr[0] & 0x03000000) == 0x01000000)
                return 0;

        return 1;
}

static int __init use_1to1_mapping(struct device_node *pp)
{
        /* If this is on the PMU bus, don't try to translate it even
         * if a ranges property exists.
         */
        if (!strcmp(pp->name, "pmu"))
                return 1;

        /* If we have a ranges property in the parent, use it.  */
        if (of_find_property(pp, "ranges", NULL) != NULL)
                return 0;

        /* If the parent is the dma node of an ISA bus, pass
         * the translation up to the root.
         */
        if (!strcmp(pp->name, "dma"))
                return 0;

        /* Similarly for all PCI bridges, if we get this far
         * it lacks a ranges property, and this will include
         * cases like Simba.
         */
        if (!strcmp(pp->type, "pci") || !strcmp(pp->type, "pciex"))
                return 0;

        return 1;
}

static int of_resource_verbose;

static void __init build_device_resources(struct of_device *op,
                                          struct device *parent)
{
        struct of_device *p_op;
        struct of_bus *bus;
        int na, ns;
        int index, num_reg;
        const void *preg;

        if (!parent)
                return;

        p_op = to_of_device(parent);
        bus = of_match_bus(p_op->node);
        bus->count_cells(op->node, &na, &ns);

        preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
        if (!preg || num_reg == 0)
                return;

        /* Convert to num-cells.  */
        num_reg /= 4;

        /* Convert to num-entries.  */
        num_reg /= na + ns;

        /* Prevent overrunning the op->resources[] array.  */
        if (num_reg > PROMREG_MAX) {
                printk(KERN_WARNING "%s: Too many regs (%d), "
                       "limiting to %d.\n",
                       op->node->full_name, num_reg, PROMREG_MAX);
                num_reg = PROMREG_MAX;
        }

        for (index = 0; index < num_reg; index++) {
                struct resource *r = &op->resource[index];
                u32 addr[OF_MAX_ADDR_CELLS];
                const u32 *reg = (preg + (index * ((na + ns) * 4)));
                struct device_node *dp = op->node;
                struct device_node *pp = p_op->node;
                struct of_bus *pbus, *dbus;
                u64 size, result = OF_BAD_ADDR;
                unsigned long flags;
                int dna, dns;
                int pna, pns;

                size = of_read_addr(reg + na, ns);
                flags = bus->get_flags(reg);

                memcpy(addr, reg, na * 4);

                if (use_1to1_mapping(pp)) {
                        result = of_read_addr(addr, na);
                        goto build_res;
                }

                dna = na;
                dns = ns;
                dbus = bus;

                while (1) {
                        dp = pp;
                        pp = dp->parent;
                        if (!pp) {
                                result = of_read_addr(addr, dna);
                                break;
                        }

                        pbus = of_match_bus(pp);
                        pbus->count_cells(dp, &pna, &pns);

                        if (build_one_resource(dp, dbus, pbus, addr,
                                               dna, dns, pna))
                                break;

                        dna = pna;
                        dns = pns;
                        dbus = pbus;
                }

        build_res:
                memset(r, 0, sizeof(*r));

                if (of_resource_verbose)
                        printk("%s reg[%d] -> %lx\n",
                               op->node->full_name, index,
                               result);

                if (result != OF_BAD_ADDR) {
                        if (tlb_type == hypervisor)
                                result &= 0x0fffffffffffffffUL;

                        r->start = result;
                        r->end = result + size - 1;
                        r->flags = flags;
                }
                r->name = op->node->name;
        }
}

static struct device_node * __init
apply_interrupt_map(struct device_node *dp, struct device_node *pp,
                    const u32 *imap, int imlen, const u32 *imask,
                    unsigned int *irq_p)
{
        struct device_node *cp;
        unsigned int irq = *irq_p;
        struct of_bus *bus;
        phandle handle;
        const u32 *reg;
        int na, num_reg, i;

        bus = of_match_bus(pp);
        bus->count_cells(dp, &na, NULL);

        reg = of_get_property(dp, "reg", &num_reg);
        if (!reg || !num_reg)
                return NULL;

        imlen /= ((na + 3) * 4);
        handle = 0;
        for (i = 0; i < imlen; i++) {
                int j;

                for (j = 0; j < na; j++) {
                        if ((reg[j] & imask[j]) != imap[j])
                                goto next;
                }
                if (imap[na] == irq) {
                        handle = imap[na + 1];
                        irq = imap[na + 2];
                        break;
                }

        next:
                imap += (na + 3);
        }
        if (i == imlen) {
                /* Psycho and Sabre PCI controllers can have 'interrupt-map'
                 * properties that do not include the on-board device
                 * interrupts.  Instead, the device's 'interrupts' property
                 * is already a fully specified INO value.
                 *
                 * Handle this by deciding that, if we didn't get a
                 * match in the parent's 'interrupt-map', and the
                 * parent is an IRQ translater, then use the parent as
                 * our IRQ controller.
                 */
                if (pp->irq_trans)
                        return pp;

                return NULL;
        }

        *irq_p = irq;
        cp = of_find_node_by_phandle(handle);

        return cp;
}

static unsigned int __init pci_irq_swizzle(struct device_node *dp,
                                           struct device_node *pp,
                                           unsigned int irq)
{
        const struct linux_prom_pci_registers *regs;
        unsigned int bus, devfn, slot, ret;

        if (irq < 1 || irq > 4)
                return irq;

        regs = of_get_property(dp, "reg", NULL);
        if (!regs)
                return irq;

        bus = (regs->phys_hi >> 16) & 0xff;
        devfn = (regs->phys_hi >> 8) & 0xff;
        slot = (devfn >> 3) & 0x1f;

        if (pp->irq_trans) {
                /* Derived from Table 8-3, U2P User's Manual.  This branch
                 * is handling a PCI controller that lacks a proper set of
                 * interrupt-map and interrupt-map-mask properties.  The
                 * Ultra-E450 is one example.
                 *
                 * The bit layout is BSSLL, where:
                 * B: 0 on bus A, 1 on bus B
                 * D: 2-bit slot number, derived from PCI device number as
                 *    (dev - 1) for bus A, or (dev - 2) for bus B
                 * L: 2-bit line number
                 */
                if (bus & 0x80) {
                        /* PBM-A */
                        bus  = 0x00;
                        slot = (slot - 1) << 2;
                } else {
                        /* PBM-B */
                        bus  = 0x10;
                        slot = (slot - 2) << 2;
                }
                irq -= 1;

                ret = (bus | slot | irq);
        } else {
                /* Going through a PCI-PCI bridge that lacks a set of
                 * interrupt-map and interrupt-map-mask properties.
                 */
                ret = ((irq - 1 + (slot & 3)) & 3) + 1;
        }

        return ret;
}

static int of_irq_verbose;

static unsigned int __init build_one_device_irq(struct of_device *op,
                                                struct device *parent,
                                                unsigned int irq)
{
        struct device_node *dp = op->node;
        struct device_node *pp, *ip;
        unsigned int orig_irq = irq;

        if (irq == 0xffffffff)
                return irq;

        if (dp->irq_trans) {
                irq = dp->irq_trans->irq_build(dp, irq,
                                               dp->irq_trans->data);

                if (of_irq_verbose)
                        printk("%s: direct translate %x --> %x\n",
                               dp->full_name, orig_irq, irq);

                return irq;
        }

        /* Something more complicated.  Walk up to the root, applying
         * interrupt-map or bus specific translations, until we hit
         * an IRQ translator.
         *
         * If we hit a bus type or situation we cannot handle, we
         * stop and assume that the original IRQ number was in a
         * format which has special meaning to it's immediate parent.
         */
        pp = dp->parent;
        ip = NULL;
        while (pp) {
                const void *imap, *imsk;
                int imlen;

                imap = of_get_property(pp, "interrupt-map", &imlen);
                imsk = of_get_property(pp, "interrupt-map-mask", NULL);
                if (imap && imsk) {
                        struct device_node *iret;
                        int this_orig_irq = irq;

                        iret = apply_interrupt_map(dp, pp,
                                                   imap, imlen, imsk,
                                                   &irq);

                        if (of_irq_verbose)
                                printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
                                       op->node->full_name,
                                       pp->full_name, this_orig_irq,
                                       (iret ? iret->full_name : "NULL"), irq);

                        if (!iret)
                                break;

                        if (iret->irq_trans) {
                                ip = iret;
                                break;
                        }
                } else {
                        if (!strcmp(pp->type, "pci") ||
                            !strcmp(pp->type, "pciex")) {
                                unsigned int this_orig_irq = irq;

                                irq = pci_irq_swizzle(dp, pp, irq);
                                if (of_irq_verbose)
                                        printk("%s: PCI swizzle [%s] "
                                               "%x --> %x\n",
                                               op->node->full_name,
                                               pp->full_name, this_orig_irq,
                                               irq);

                        }

                        if (pp->irq_trans) {
                                ip = pp;
                                break;
                        }
                }
                dp = pp;
                pp = pp->parent;
        }
        if (!ip)
                return orig_irq;

        irq = ip->irq_trans->irq_build(op->node, irq,
                                       ip->irq_trans->data);
        if (of_irq_verbose)
                printk("%s: Apply IRQ trans [%s] %x --> %x\n",
                       op->node->full_name, ip->full_name, orig_irq, irq);

        return irq;
}

static struct of_device * __init scan_one_device(struct device_node *dp,
                                                 struct device *parent)
{
        struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
        const unsigned int *irq;
        int len, i;

        if (!op)
                return NULL;

        op->node = dp;

        op->clock_freq = of_getintprop_default(dp, "clock-frequency",
                                               (25*1000*1000));
        op->portid = of_getintprop_default(dp, "upa-portid", -1);
        if (op->portid == -1)
                op->portid = of_getintprop_default(dp, "portid", -1);

        irq = of_get_property(dp, "interrupts", &len);
        if (irq) {
                memcpy(op->irqs, irq, len);
                op->num_irqs = len / 4;
        } else {
                op->num_irqs = 0;
        }

        /* Prevent overrunning the op->irqs[] array.  */
        if (op->num_irqs > PROMINTR_MAX) {
                printk(KERN_WARNING "%s: Too many irqs (%d), "
                       "limiting to %d.\n",
                       dp->full_name, op->num_irqs, PROMINTR_MAX);
                op->num_irqs = PROMINTR_MAX;
        }

        build_device_resources(op, parent);
        for (i = 0; i < op->num_irqs; i++)
                op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);

        op->dev.parent = parent;
        op->dev.bus = &of_platform_bus_type;
        if (!parent)
                strcpy(op->dev.bus_id, "root");
        else
                sprintf(op->dev.bus_id, "%08x", dp->node);

        if (of_device_register(op)) {
                printk("%s: Could not register of device.\n",
                       dp->full_name);
                kfree(op);
                op = NULL;
        }

        return op;
}

static void __init scan_tree(struct device_node *dp, struct device *parent)
{
        while (dp) {
                struct of_device *op = scan_one_device(dp, parent);

                if (op)
                        scan_tree(dp->child, &op->dev);

                dp = dp->sibling;
        }
}

static void __init scan_of_devices(void)
{
        struct device_node *root = of_find_node_by_path("/");
        struct of_device *parent;

        parent = scan_one_device(root, NULL);
        if (!parent)
                return;

        scan_tree(root->child, &parent->dev);
}

static int __init of_bus_driver_init(void)
{
        int err;

        err = bus_register(&of_platform_bus_type);
#ifdef CONFIG_PCI
        if (!err)
                err = bus_register(&isa_bus_type);
        if (!err)
                err = bus_register(&ebus_bus_type);
#endif
#ifdef CONFIG_SBUS
        if (!err)
                err = bus_register(&sbus_bus_type);
#endif

        if (!err)
                scan_of_devices();

        return err;
}

postcore_initcall(of_bus_driver_init);

static int __init of_debug(char *str)
{
        int val = 0;

        get_option(&str, &val);
        if (val & 1)
                of_resource_verbose = 1;
        if (val & 2)
                of_irq_verbose = 1;
        return 1;
}

__setup("of_debug=", of_debug);

int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
{
        /* initialize common driver fields */
        drv->driver.name = drv->name;
        drv->driver.bus = bus;

        /* register with core */
        return driver_register(&drv->driver);
}
EXPORT_SYMBOL(of_register_driver);

void of_unregister_driver(struct of_platform_driver *drv)
{
        driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(of_unregister_driver);

struct of_device* of_platform_device_create(struct device_node *np,
                                            const char *bus_id,
                                            struct device *parent,
                                            struct bus_type *bus)
{
        struct of_device *dev;

        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
        if (!dev)
                return NULL;

        dev->dev.parent = parent;
        dev->dev.bus = bus;
        dev->dev.release = of_release_dev;

        strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);

        if (of_device_register(dev) != 0) {
                kfree(dev);
                return NULL;
        }

        return dev;
}
EXPORT_SYMBOL(of_platform_device_create);