prom.c

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/*
 *  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.
 *
 * Copyright (C) 2010 John Crispin <[email protected]>
 */

#include <linux/export.h>
#include <linux/clk.h>
#include <linux/bootmem.h>
#include <linux/of_platform.h>
#include <linux/of_fdt.h>

#include <asm/bootinfo.h>
#include <asm/time.h>

#include <lantiq.h>

#include "prom.h"
#include "clk.h"

/* access to the ebu needs to be locked between different drivers */
DEFINE_SPINLOCK(ebu_lock);
EXPORT_SYMBOL_GPL(ebu_lock);

/*
 * this struct is filled by the soc specific detection code and holds
 * information about the specific soc type, revision and name
 */
static struct ltq_soc_info soc_info;

const char *get_system_type(void)
{
    return soc_info.sys_type;
}

void prom_free_prom_memory(void)
{
}

static void __init prom_init_cmdline(void)
{
    int argc = fw_arg0;
    char **argv = (char **) KSEG1ADDR(fw_arg1);
    int i;

    arcs_cmdline[0] = '\0';

    for (i = 0; i < argc; i++) {
        char *p = (char *) KSEG1ADDR(argv[i]);

        if (CPHYSADDR(p) && *p) {
            strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
            strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
        }
    }
}

void __init plat_mem_setup(void)
{
    ioport_resource.start = IOPORT_RESOURCE_START;
    ioport_resource.end = IOPORT_RESOURCE_END;
    iomem_resource.start = IOMEM_RESOURCE_START;
    iomem_resource.end = IOMEM_RESOURCE_END;

    set_io_port_base((unsigned long) KSEG1);

    /*
     * Load the builtin devicetree. This causes the chosen node to be
     * parsed resulting in our memory appearing
     */
    __dt_setup_arch(&__dtb_start);
}

void __init device_tree_init(void)
{
    unsigned long base, size;

    if (!initial_boot_params)
        return;

    base = virt_to_phys((void *)initial_boot_params);
    size = be32_to_cpu(initial_boot_params->totalsize);

    /* Before we do anything, lets reserve the dt blob */
    reserve_bootmem(base, size, BOOTMEM_DEFAULT);

    unflatten_device_tree();

    /* free the space reserved for the dt blob */
    free_bootmem(base, size);
}

void __init prom_init(void)
{
    /* call the soc specific detetcion code and get it to fill soc_info */
    ltq_soc_detect(&soc_info);
    snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev %s",
        soc_info.name, soc_info.rev_type);
    soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0';
    pr_info("SoC: %s\n", soc_info.sys_type);
    prom_init_cmdline();

#if defined(CONFIG_MIPS_MT_SMP)
    if (register_vsmp_smp_ops())
        panic("failed to register_vsmp_smp_ops()");
#endif
}

int __init plat_of_setup(void)
{
    static struct of_device_id of_ids[3];

    if (!of_have_populated_dt())
        panic("device tree not present");

    strncpy(of_ids[0].compatible, soc_info.compatible,
        sizeof(of_ids[0].compatible));
    strncpy(of_ids[1].compatible, "simple-bus",
        sizeof(of_ids[1].compatible));
    return of_platform_bus_probe(NULL, of_ids, NULL);
}

arch_initcall(plat_of_setup);