planetcore.c

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/*
 * PlanetCore configuration data support functions
 *
 * Author: Scott Wood <[email protected]>
 *
 * Copyright (c) 2007 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

#include "stdio.h"
#include "stdlib.h"
#include "ops.h"
#include "planetcore.h"
#include "io.h"

/* PlanetCore passes information to the OS in the form of
 * a table of key=value strings, separated by newlines.
 *
 * The list is terminated by an empty string (i.e. two
 * consecutive newlines).
 *
 * To make it easier to parse, we first convert all the
 * newlines into null bytes.
 */

void planetcore_prepare_table(char *table)
{
    do {
        if (*table == '\n')
            *table = 0;

        table++;
    } while (*(table - 1) || *table != '\n');

    *table = 0;
}

const char *planetcore_get_key(const char *table, const char *key)
{
    int keylen = strlen(key);

    do {
        if (!strncmp(table, key, keylen) && table[keylen] == '=')
            return table + keylen + 1;

        table += strlen(table) + 1;
    } while (strlen(table) != 0);

    return NULL;
}

int planetcore_get_decimal(const char *table, const char *key, u64 *val)
{
    const char *str = planetcore_get_key(table, key);
    if (!str)
        return 0;

    *val = strtoull(str, NULL, 10);
    return 1;
}

int planetcore_get_hex(const char *table, const char *key, u64 *val)
{
    const char *str = planetcore_get_key(table, key);
    if (!str)
        return 0;

    *val = strtoull(str, NULL, 16);
    return 1;
}

static u64 mac_table[4] = {
    0x000000000000,
    0x000000800000,
    0x000000400000,
    0x000000c00000,
};

void planetcore_set_mac_addrs(const char *table)
{
    u8 addr[4][6];
    u64 int_addr;
    u32 i;
    int j;

    if (!planetcore_get_hex(table, PLANETCORE_KEY_MAC_ADDR, &int_addr))
        return;

    for (i = 0; i < 4; i++) {
        u64 this_dev_addr = (int_addr & ~0x000000c00000) |
                            mac_table[i];

        for (j = 5; j >= 0; j--) {
            addr[i][j] = this_dev_addr & 0xff;
            this_dev_addr >>= 8;
        }

        dt_fixup_mac_address(i, addr[i]);
    }
}

static char prop_buf[MAX_PROP_LEN];

void planetcore_set_stdout_path(const char *table)
{
    char *path;
    const char *label;
    void *node, *chosen;

    label = planetcore_get_key(table, PLANETCORE_KEY_SERIAL_PORT);
    if (!label)
        return;

    node = find_node_by_prop_value_str(NULL, "linux,planetcore-label",
                                       label);
    if (!node)
        return;

    path = get_path(node, prop_buf, MAX_PROP_LEN);
    if (!path)
        return;

    chosen = finddevice("/chosen");
    if (!chosen)
        chosen = create_node(NULL, "chosen");
    if (!chosen)
        return;

    setprop_str(chosen, "linux,stdout-path", path);
}

void planetcore_set_serial_speed(const char *table)
{
    void *chosen, *stdout;
    u64 baud;
    u32 baud32;
    int len;

    chosen = finddevice("/chosen");
    if (!chosen)
        return;

    len = getprop(chosen, "linux,stdout-path", prop_buf, MAX_PROP_LEN);
    if (len <= 0)
        return;

    stdout = finddevice(prop_buf);
    if (!stdout) {
        printf("planetcore_set_serial_speed: "
               "Bad /chosen/linux,stdout-path.\r\n");

        return;
    }

    if (!planetcore_get_decimal(table, PLANETCORE_KEY_SERIAL_BAUD,
                                &baud)) {
        printf("planetcore_set_serial_speed: No SB tag.\r\n");
        return;
    }

    baud32 = baud;
    setprop(stdout, "current-speed", &baud32, 4);
}