prom_32.c

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/*
 * 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 sparc32 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/bootmem.h>

#include <asm/prom.h>
#include <asm/oplib.h>
#include <asm/leon.h>
#include <asm/leon_amba.h>

#include "prom.h"

void * __init prom_early_alloc(unsigned long size)
{
    void *ret;

    ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
    if (ret != NULL)
        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.
 */
static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
{
    struct linux_prom_registers *regs;
    struct property *rprop;

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

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

/* "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@addrhi,addrlo" */
static void __init ebus_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:vendor:device@irq,addrlo" */
static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
{
    struct amba_prom_registers *regs;
    unsigned int *intr, *device, *vendor, reg0;
    struct property *prop;
    int interrupt = 0;

    /* In order to get a unique ID in the device tree (multiple AMBA devices
     * may have the same name) the node number is printed
     */
    prop = of_find_property(dp, "reg", NULL);
    if (!prop) {
        reg0 = (unsigned int)dp->phandle;
    } else {
        regs = prop->value;
        reg0 = regs->phys_addr;
    }

    /* Not all cores have Interrupt */
    prop = of_find_property(dp, "interrupts", NULL);
    if (!prop)
        intr = &interrupt; /* IRQ0 does not exist */
    else
        intr = prop->value;

    prop = of_find_property(dp, "vendor", NULL);
    if (!prop)
        return;
    vendor = prop->value;
    prop = of_find_property(dp, "device", NULL);
    if (!prop)
        return;
    device = prop->value;

    sprintf(tmp_buf, "%s:%d:%d@%x,%x",
        dp->name, *vendor, *device,
        *intr, reg0);
}

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"))
            return pci_path_component(dp, tmp_buf);
        if (!strcmp(parent->type, "sbus"))
            return sbus_path_component(dp, tmp_buf);
        if (!strcmp(parent->type, "ebus"))
            return ebus_path_component(dp, tmp_buf);
        if (!strcmp(parent->type, "ambapp"))
            return ambapp_path_component(dp, tmp_buf);

        /* "isa" is handled with platform naming */
    }

    /* Use platform naming convention.  */
    return sparc32_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;
}

extern void restore_current(void);

void __init of_console_init(void)
{
    char *msg = "OF stdout device is: %s\n";
    struct device_node *dp;
    unsigned long flags;
    const char *type;
    phandle node;
    int skip, tmp, fd;

    of_console_path = prom_early_alloc(256);

    switch (prom_vers) {
    case PROM_V0:
        skip = 0;
        switch (*romvec->pv_stdout) {
        case PROMDEV_SCREEN:
            type = "display";
            break;

        case PROMDEV_TTYB:
            skip = 1;
            /* FALLTHRU */

        case PROMDEV_TTYA:
            type = "serial";
            break;

        default:
            prom_printf("Invalid PROM_V0 stdout value %u\n",
                    *romvec->pv_stdout);
            prom_halt();
        }

        tmp = skip;
        for_each_node_by_type(dp, type) {
            if (!tmp--)
                break;
        }
        if (!dp) {
            prom_printf("Cannot find PROM_V0 console node.\n");
            prom_halt();
        }
        of_console_device = dp;

        strcpy(of_console_path, dp->full_name);
        if (!strcmp(type, "serial")) {
            strcat(of_console_path,
                   (skip ? ":b" : ":a"));
        }
        break;

    default:
    case PROM_V2:
    case PROM_V3:
        fd = *romvec->pv_v2bootargs.fd_stdout;

        spin_lock_irqsave(&prom_lock, flags);
        node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
        restore_current();
        spin_unlock_irqrestore(&prom_lock, flags);

        if (!node) {
            prom_printf("Cannot resolve stdout node from "
                    "instance %08x.\n", fd);
            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;

        if (prom_vers == PROM_V2) {
            strcpy(of_console_path, dp->full_name);
            switch (*romvec->pv_stdout) {
            case PROMDEV_TTYA:
                strcat(of_console_path, ":a");
                break;
            case PROMDEV_TTYB:
                strcat(of_console_path, ":b");
                break;
            }
        } else {
            const char *path;

            dp = of_find_node_by_path("/");
            path = of_get_property(dp, "stdout-path", NULL);
            if (!path) {
                prom_printf("No stdout-path in root node.\n");
                prom_halt();
            }
            strcpy(of_console_path, path);
        }
        break;
    }

    of_console_options = strrchr(of_console_path, ':');
    if (of_console_options) {
        of_console_options++;
        if (*of_console_options == '\0')
            of_console_options = NULL;
    }

    printk(msg, of_console_path);
}

void __init of_fill_in_cpu_data(void)
{
}

void __init irq_trans_init(struct device_node *dp)
{
}