qemu_e500.c

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/*
 * Paravirt target for a generic QEMU e500 machine
 *
 * This is intended to be a flexible device-tree-driven platform, not fixed
 * to a particular piece of hardware or a particular spec of virtual hardware,
 * beyond the assumption of an e500-family CPU.  Some things are still hardcoded
 * here, such as MPIC, but this is a limitation of the current code rather than
 * an interface contract with QEMU.
 *
 * Copyright 2012 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 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/of_fdt.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/udbg.h>
#include <asm/mpic.h>
#include <sysdev/fsl_soc.h>
#include <sysdev/fsl_pci.h>
#include "smp.h"
#include "mpc85xx.h"

void __init qemu_e500_pic_init(void)
{
    struct mpic *mpic;

    mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | MPIC_SINGLE_DEST_CPU,
            0, 256, " OpenPIC  ");

    BUG_ON(mpic == NULL);
    mpic_init(mpic);
}

static void __init qemu_e500_setup_arch(void)
{
    ppc_md.progress("qemu_e500_setup_arch()", 0);

    fsl_pci_assign_primary();
    swiotlb_detect_4g();
    mpc85xx_smp_init();
}

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init qemu_e500_probe(void)
{
    unsigned long root = of_get_flat_dt_root();

    return !!of_flat_dt_is_compatible(root, "fsl,qemu-e500");
}

machine_arch_initcall(qemu_e500, mpc85xx_common_publish_devices);

define_machine(qemu_e500) {
    .name           = "QEMU e500",
    .probe          = qemu_e500_probe,
    .setup_arch     = qemu_e500_setup_arch,
    .init_IRQ       = qemu_e500_pic_init,
#ifdef CONFIG_PCI
    .pcibios_fixup_bus  = fsl_pcibios_fixup_bus,
#endif
    .get_irq        = mpic_get_irq,
    .restart        = fsl_rstcr_restart,
    .calibrate_decr     = generic_calibrate_decr,
    .progress       = udbg_progress,
};