prom_64.c

Go to the documentation of this file.

/*
 * Procedures for creating, accessing and interpreting the device tree.
 *
 * Paul Mackerras   August 1996.
 * Copyright (C) 1996-2005 Paul Mackerras.
 * 
 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
 *    {engebret|bergner}@us.ibm.com 
 *
 *  Adapted for sparc64 by David S. Miller [email protected]
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/of.h>

#include <asm/prom.h>
#include <asm/oplib.h>
#include <asm/irq.h>
#include <asm/asi.h>
#include <asm/upa.h>
#include <asm/smp.h>

#include "prom.h"

void * __init prom_early_alloc(unsigned long size)
{
    unsigned long paddr = memblock_alloc(size, SMP_CACHE_BYTES);
    void *ret;

    if (!paddr) {
        prom_printf("prom_early_alloc(%lu) failed\n", size);
        prom_halt();
    }

    ret = __va(paddr);
    memset(ret, 0, size);
    prom_early_allocated += size;

    return ret;
}

/* The following routines deal with the black magic of fully naming a
 * node.
 *
 * Certain well known named nodes are just the simple name string.
 *
 * Actual devices have an address specifier appended to the base name
 * string, like this "foo@addr".  The "addr" can be in any number of
 * formats, and the platform plus the type of the node determine the
 * format and how it is constructed.
 *
 * For children of the ROOT node, the naming convention is fixed and
 * determined by whether this is a sun4u or sun4v system.
 *
 * For children of other nodes, it is bus type specific.  So
 * we walk up the tree until we discover a "device_type" property
 * we recognize and we go from there.
 *
 * As an example, the boot device on my workstation has a full path:
 *
 *  /pci@1e,600000/ide@d/disk@0,0:c
 */
static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
{
    struct linux_prom64_registers *regs;
    struct property *rprop;
    u32 high_bits, low_bits, type;

    rprop = of_find_property(dp, "reg", NULL);
    if (!rprop)
        return;

    regs = rprop->value;
    if (!of_node_is_root(dp->parent)) {
        sprintf(tmp_buf, "%s@%x,%x",
            dp->name,
            (unsigned int) (regs->phys_addr >> 32UL),
            (unsigned int) (regs->phys_addr & 0xffffffffUL));
        return;
    }

    type = regs->phys_addr >> 60UL;
    high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL;
    low_bits = (regs->phys_addr & 0xffffffffUL);

    if (type == 0 || type == 8) {
        const char *prefix = (type == 0) ? "m" : "i";

        if (low_bits)
            sprintf(tmp_buf, "%s@%s%x,%x",
                dp->name, prefix,
                high_bits, low_bits);
        else
            sprintf(tmp_buf, "%s@%s%x",
                dp->name,
                prefix,
                high_bits);
    } else if (type == 12) {
        sprintf(tmp_buf, "%s@%x",
            dp->name, high_bits);
    }
}

static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
{
    struct linux_prom64_registers *regs;
    struct property *prop;

    prop = of_find_property(dp, "reg", NULL);
    if (!prop)
        return;

    regs = prop->value;
    if (!of_node_is_root(dp->parent)) {
        sprintf(tmp_buf, "%s@%x,%x",
            dp->name,
            (unsigned int) (regs->phys_addr >> 32UL),
            (unsigned int) (regs->phys_addr & 0xffffffffUL));
        return;
    }

    prop = of_find_property(dp, "upa-portid", NULL);
    if (!prop)
        prop = of_find_property(dp, "portid", NULL);
    if (prop) {
        unsigned long mask = 0xffffffffUL;

        if (tlb_type >= cheetah)
            mask = 0x7fffff;

        sprintf(tmp_buf, "%s@%x,%x",
            dp->name,
            *(u32 *)prop->value,
            (unsigned int) (regs->phys_addr & mask));
    }
}

/* "name@slot,offset"  */
static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
{
    struct linux_prom_registers *regs;
    struct property *prop;

    prop = of_find_property(dp, "reg", NULL);
    if (!prop)
        return;

    regs = prop->value;
    sprintf(tmp_buf, "%s@%x,%x",
        dp->name,
        regs->which_io,
        regs->phys_addr);
}

/* "name@devnum[,func]" */
static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
{
    struct linux_prom_pci_registers *regs;
    struct property *prop;
    unsigned int devfn;

    prop = of_find_property(dp, "reg", NULL);
    if (!prop)
        return;

    regs = prop->value;
    devfn = (regs->phys_hi >> 8) & 0xff;
    if (devfn & 0x07) {
        sprintf(tmp_buf, "%s@%x,%x",
            dp->name,
            devfn >> 3,
            devfn & 0x07);
    } else {
        sprintf(tmp_buf, "%s@%x",
            dp->name,
            devfn >> 3);
    }
}

/* "name@UPA_PORTID,offset" */
static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
{
    struct linux_prom64_registers *regs;
    struct property *prop;

    prop = of_find_property(dp, "reg", NULL);
    if (!prop)
        return;

    regs = prop->value;

    prop = of_find_property(dp, "upa-portid", NULL);
    if (!prop)
        return;

    sprintf(tmp_buf, "%s@%x,%x",
        dp->name,
        *(u32 *) prop->value,
        (unsigned int) (regs->phys_addr & 0xffffffffUL));
}

/* "name@reg" */
static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
{
    struct property *prop;
    u32 *regs;

    prop = of_find_property(dp, "reg", NULL);
    if (!prop)
        return;

    regs = prop->value;

    sprintf(tmp_buf, "%s@%x", dp->name, *regs);
}

/* "name@addrhi,addrlo" */
static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
{
    struct linux_prom64_registers *regs;
    struct property *prop;

    prop = of_find_property(dp, "reg", NULL);
    if (!prop)
        return;

    regs = prop->value;

    sprintf(tmp_buf, "%s@%x,%x",
        dp->name,
        (unsigned int) (regs->phys_addr >> 32UL),
        (unsigned int) (regs->phys_addr & 0xffffffffUL));
}

/* "name@bus,addr" */
static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
{
    struct property *prop;
    u32 *regs;

    prop = of_find_property(dp, "reg", NULL);
    if (!prop)
        return;

    regs = prop->value;

    /* This actually isn't right... should look at the #address-cells
     * property of the i2c bus node etc. etc.
     */
    sprintf(tmp_buf, "%s@%x,%x",
        dp->name, regs[0], regs[1]);
}

/* "name@reg0[,reg1]" */
static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
{
    struct property *prop;
    u32 *regs;

    prop = of_find_property(dp, "reg", NULL);
    if (!prop)
        return;

    regs = prop->value;

    if (prop->length == sizeof(u32) || regs[1] == 1) {
        sprintf(tmp_buf, "%s@%x",
            dp->name, regs[0]);
    } else {
        sprintf(tmp_buf, "%s@%x,%x",
            dp->name, regs[0], regs[1]);
    }
}

/* "name@reg0reg1[,reg2reg3]" */
static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
{
    struct property *prop;
    u32 *regs;

    prop = of_find_property(dp, "reg", NULL);
    if (!prop)
        return;

    regs = prop->value;

    if (regs[2] || regs[3]) {
        sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
            dp->name, regs[0], regs[1], regs[2], regs[3]);
    } else {
        sprintf(tmp_buf, "%s@%08x%08x",
            dp->name, regs[0], regs[1]);
    }
}

static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
{
    struct device_node *parent = dp->parent;

    if (parent != NULL) {
        if (!strcmp(parent->type, "pci") ||
            !strcmp(parent->type, "pciex")) {
            pci_path_component(dp, tmp_buf);
            return;
        }
        if (!strcmp(parent->type, "sbus")) {
            sbus_path_component(dp, tmp_buf);
            return;
        }
        if (!strcmp(parent->type, "upa")) {
            upa_path_component(dp, tmp_buf);
            return;
        }
        if (!strcmp(parent->type, "ebus")) {
            ebus_path_component(dp, tmp_buf);
            return;
        }
        if (!strcmp(parent->name, "usb") ||
            !strcmp(parent->name, "hub")) {
            usb_path_component(dp, tmp_buf);
            return;
        }
        if (!strcmp(parent->type, "i2c")) {
            i2c_path_component(dp, tmp_buf);
            return;
        }
        if (!strcmp(parent->type, "firewire")) {
            ieee1394_path_component(dp, tmp_buf);
            return;
        }
        if (!strcmp(parent->type, "virtual-devices")) {
            vdev_path_component(dp, tmp_buf);
            return;
        }
        /* "isa" is handled with platform naming */
    }

    /* Use platform naming convention.  */
    if (tlb_type == hypervisor) {
        sun4v_path_component(dp, tmp_buf);
        return;
    } else {
        sun4u_path_component(dp, tmp_buf);
    }
}

char * __init build_path_component(struct device_node *dp)
{
    char tmp_buf[64], *n;

    tmp_buf[0] = '\0';
    __build_path_component(dp, tmp_buf);
    if (tmp_buf[0] == '\0')
        strcpy(tmp_buf, dp->name);

    n = prom_early_alloc(strlen(tmp_buf) + 1);
    strcpy(n, tmp_buf);

    return n;
}

static const char *get_mid_prop(void)
{
    return (tlb_type == spitfire ? "upa-portid" : "portid");
}

static void *of_iterate_over_cpus(void *(*func)(struct device_node *, int, int), int arg)
{
    struct device_node *dp;
    const char *mid_prop;

    mid_prop = get_mid_prop();
    for_each_node_by_type(dp, "cpu") {
        int cpuid = of_getintprop_default(dp, mid_prop, -1);
        const char *this_mid_prop = mid_prop;
        void *ret;

        if (cpuid < 0) {
            this_mid_prop = "cpuid";
            cpuid = of_getintprop_default(dp, this_mid_prop, -1);
        }
        if (cpuid < 0) {
            prom_printf("OF: Serious problem, cpu lacks "
                    "%s property", this_mid_prop);
            prom_halt();
        }
#ifdef CONFIG_SMP
        if (cpuid >= NR_CPUS) {
            printk(KERN_WARNING "Ignoring CPU %d which is "
                   ">= NR_CPUS (%d)\n",
                   cpuid, NR_CPUS);
            continue;
        }
#endif
        ret = func(dp, cpuid, arg);
        if (ret)
            return ret;
    }
    return NULL;
}

static void *check_cpu_node(struct device_node *dp, int cpuid, int id)
{
    if (id == cpuid)
        return dp;
    return NULL;
}

struct device_node *of_find_node_by_cpuid(int cpuid)
{
    return of_iterate_over_cpus(check_cpu_node, cpuid);
}

static void *record_one_cpu(struct device_node *dp, int cpuid, int arg)
{
    ncpus_probed++;
#ifdef CONFIG_SMP
    set_cpu_present(cpuid, true);
    set_cpu_possible(cpuid, true);
#endif
    return NULL;
}

void __init of_populate_present_mask(void)
{
    if (tlb_type == hypervisor)
        return;

    ncpus_probed = 0;
    of_iterate_over_cpus(record_one_cpu, 0);
}

static void *fill_in_one_cpu(struct device_node *dp, int cpuid, int arg)
{
    struct device_node *portid_parent = NULL;
    int portid = -1;

    if (of_find_property(dp, "cpuid", NULL)) {
        int limit = 2;

        portid_parent = dp;
        while (limit--) {
            portid_parent = portid_parent->parent;
            if (!portid_parent)
                break;
            portid = of_getintprop_default(portid_parent,
                               "portid", -1);
            if (portid >= 0)
                break;
        }
    }

#ifndef CONFIG_SMP
    /* On uniprocessor we only want the values for the
     * real physical cpu the kernel booted onto, however
     * cpu_data() only has one entry at index 0.
     */
    if (cpuid != real_hard_smp_processor_id())
        return NULL;
    cpuid = 0;
#endif

    cpu_data(cpuid).clock_tick =
        of_getintprop_default(dp, "clock-frequency", 0);

    if (portid_parent) {
        cpu_data(cpuid).dcache_size =
            of_getintprop_default(dp, "l1-dcache-size",
                          16 * 1024);
        cpu_data(cpuid).dcache_line_size =
            of_getintprop_default(dp, "l1-dcache-line-size",
                          32);
        cpu_data(cpuid).icache_size =
            of_getintprop_default(dp, "l1-icache-size",
                          8 * 1024);
        cpu_data(cpuid).icache_line_size =
            of_getintprop_default(dp, "l1-icache-line-size",
                          32);
        cpu_data(cpuid).ecache_size =
            of_getintprop_default(dp, "l2-cache-size", 0);
        cpu_data(cpuid).ecache_line_size =
            of_getintprop_default(dp, "l2-cache-line-size", 0);
        if (!cpu_data(cpuid).ecache_size ||
            !cpu_data(cpuid).ecache_line_size) {
            cpu_data(cpuid).ecache_size =
                of_getintprop_default(portid_parent,
                              "l2-cache-size",
                              (4 * 1024 * 1024));
            cpu_data(cpuid).ecache_line_size =
                of_getintprop_default(portid_parent,
                              "l2-cache-line-size", 64);
        }

        cpu_data(cpuid).core_id = portid + 1;
        cpu_data(cpuid).proc_id = portid;
#ifdef CONFIG_SMP
        sparc64_multi_core = 1;
#endif
    } else {
        cpu_data(cpuid).dcache_size =
            of_getintprop_default(dp, "dcache-size", 16 * 1024);
        cpu_data(cpuid).dcache_line_size =
            of_getintprop_default(dp, "dcache-line-size", 32);

        cpu_data(cpuid).icache_size =
            of_getintprop_default(dp, "icache-size", 16 * 1024);
        cpu_data(cpuid).icache_line_size =
            of_getintprop_default(dp, "icache-line-size", 32);

        cpu_data(cpuid).ecache_size =
            of_getintprop_default(dp, "ecache-size",
                          (4 * 1024 * 1024));
        cpu_data(cpuid).ecache_line_size =
            of_getintprop_default(dp, "ecache-line-size", 64);

        cpu_data(cpuid).core_id = 0;
        cpu_data(cpuid).proc_id = -1;
    }

    return NULL;
}

void __init of_fill_in_cpu_data(void)
{
    if (tlb_type == hypervisor)
        return;

    of_iterate_over_cpus(fill_in_one_cpu, 0);

    smp_fill_in_sib_core_maps();
}

void __init of_console_init(void)
{
    char *msg = "OF stdout device is: %s\n";
    struct device_node *dp;
    const char *type;
    phandle node;

    of_console_path = prom_early_alloc(256);
    if (prom_ihandle2path(prom_stdout, of_console_path, 256) < 0) {
        prom_printf("Cannot obtain path of stdout.\n");
        prom_halt();
    }
    of_console_options = strrchr(of_console_path, ':');
    if (of_console_options) {
        of_console_options++;
        if (*of_console_options == '\0')
            of_console_options = NULL;
    }

    node = prom_inst2pkg(prom_stdout);
    if (!node) {
        prom_printf("Cannot resolve stdout node from "
                "instance %08x.\n", prom_stdout);
        prom_halt();
    }

    dp = of_find_node_by_phandle(node);
    type = of_get_property(dp, "device_type", NULL);
    if (!type) {
        prom_printf("Console stdout lacks device_type property.\n");
        prom_halt();
    }

    if (strcmp(type, "display") && strcmp(type, "serial")) {
        prom_printf("Console device_type is neither display "
                "nor serial.\n");
        prom_halt();
    }

    of_console_device = dp;

    printk(msg, of_console_path);
}