uboot/fdt/uboot_fdt.c

	uboot_fdt.c revision 199767f8919635c4928607450d9e0abb932109ce
/*-
 * Copyright (c) 2009-2010 The FreeBSD Foundation
 * All rights reserved.
 *
 * This software was developed by Semihalf under sponsorship from
 * the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <stand.h>
#include <fdt_platform.h>

#include "glue.h"

#define STR(number) #number
#define STRINGIFY(number) STR(number)

int
fdt_platform_load_dtb(void)
{
    struct fdt_header *hdr;
    const char *s;
    char *p;

    /*
     * If the U-boot environment contains a variable giving the address of a
     * valid blob in memory, use it.  The U-boot README says the right
     * variable for fdt data loaded into ram is fdt_addr_r, so try that
     * first.  Board vendors also use both fdtaddr and fdt_addr names.
     */
    s = ub_env_get("fdt_addr_r");
    if (s == NULL)
        s = ub_env_get("fdtaddr");
    if (s == NULL)
        s = ub_env_get("fdt_addr");
    if (s != NULL && *s != '\0') {
        hdr = (struct fdt_header *)strtoul(s, &p, 16);
        if (*p == '\0') {
            if (fdt_load_dtb_addr(hdr) == 0) {
                printf("Using DTB provided by U-Boot at "
                    "address %p.\n", hdr);
                return (0);
            }
        }
    }

    /*
     * Try to get FDT filename first from loader env and then from u-boot env
     */
    s = getenv("fdt_file");
    if (s == NULL)
        s = ub_env_get("fdtfile");
    if (s == NULL)
        s = ub_env_get("fdt_file");
    if (s != NULL && *s != '\0') {
        if (fdt_load_dtb_file(s) == 0) {
            printf("Loaded DTB from file '%s'.\n", s);
            return (0);
        }
    }

    return (1);
}

void
fdt_platform_fixups(void)
{
    static struct fdt_mem_region regions[UB_MAX_MR];
    const char *env, *str;
    char *end, *ethstr;
    int eth_no, i, len, n;
    struct sys_info *si;

    env = NULL;
    eth_no = 0;
    ethstr = NULL;

    /* Acquire sys_info */
    si = ub_get_sys_info();

    while ((env = ub_env_enum(env)) != NULL) {
        if (strncmp(env, "eth", 3) == 0 &&
            strncmp(env + (strlen(env) - 4), "addr", 4) == 0) {
            /*
             * Handle Ethernet addrs: parse uboot env eth%daddr
             */

            if (!eth_no) {
                /*
                 * Check how many chars we will need to store
                 * maximal eth iface number.
                 */
                len = strlen(STRINGIFY(TMP_MAX_ETH)) +
                    strlen("ethernet") + 1;

                /*
                 * Reserve mem for string "ethernet" and len
                 * chars for iface no.
                 */
                ethstr = (char *)malloc(len * sizeof(char));
                bzero(ethstr, len * sizeof(char));
                strcpy(ethstr, "ethernet0");
            }

            /* Extract interface number */
            i = strtol(env + 3, &end, 10);
            if (end == (env + 3))
                /* 'ethaddr' means interface 0 address */
                n = 0;
            else
                n = i;

            if (n > TMP_MAX_ETH)
                continue;

            str = ub_env_get(env);

            if (n != 0) {
                /*
                 * Find the lenght of the interface id by
                 * taking in to account the first 3 and
                 * last 4 characters.
                 */
                i = strlen(env) - 7;
                strncpy(ethstr + 8, env + 3, i);
            }

            /* Modify blob */
            fdt_fixup_ethernet(str, ethstr, len);

            /* Clear ethernet..XXXX.. string */
            bzero(ethstr + 8, len - 8);

            if (n + 1 > eth_no)
                eth_no = n + 1;
        } else if (strcmp(env, "consoledev") == 0) {
            str = ub_env_get(env);
            fdt_fixup_stdout(str);
        }
    }

    /* Modify cpu(s) and bus clock frequenties in /cpus node [Hz] */
    fdt_fixup_cpubusfreqs(si->clk_cpu, si->clk_bus);

    /* Extract the DRAM regions into fdt_mem_region format. */
    for (i = 0, n = 0; i < si->mr_no && n < nitems(regions); i++) {
        if (si->mr[i].flags == MR_ATTR_DRAM) {
            regions[n].start = si->mr[i].start;
            regions[n].size = si->mr[i].size;
            n++;
        }
    }

    /* Fixup memory regions */
    fdt_fixup_memory(regions, n);
}