LXR linux/arch/powerpc/platforms/85xx/qemu

   1/*
   2 * Paravirt target for a generic QEMU e500 machine
   3 *
   4 * This is intended to be a flexible device-tree-driven platform, not fixed
   5 * to a particular piece of hardware or a particular spec of virtual hardware,
   6 * beyond the assumption of an e500-family CPU.  Some things are still hardcoded
   7 * here, such as MPIC, but this is a limitation of the current code rather than
   8 * an interface contract with QEMU.
   9 *
  10 * Copyright 2012 Freescale Semiconductor Inc.
  11 *
  12 * This program is free software; you can redistribute  it and/or modify it
  13 * under  the terms of  the GNU General  Public License as published by the
  14 * Free Software Foundation;  either version 2 of the  License, or (at your
  15 * option) any later version.
  16 */
  17
  18#include <linux/kernel.h>
  19#include <linux/of_fdt.h>
  20#include <asm/machdep.h>
  21#include <asm/pgtable.h>
  22#include <asm/time.h>
  23#include <asm/udbg.h>
  24#include <asm/mpic.h>
  25#include <sysdev/fsl_soc.h>
  26#include <sysdev/fsl_pci.h>
  27#include "smp.h"
  28#include "mpc85xx.h"
  29
  30void __init qemu_e500_pic_init(void)
  31{
  32        struct mpic *mpic;
  33        unsigned int flags = MPIC_BIG_ENDIAN | MPIC_SINGLE_DEST_CPU |
  34                MPIC_ENABLE_COREINT;
  35
  36        mpic = mpic_alloc(NULL, 0, flags, 0, 256, " OpenPIC  ");
  37
  38        BUG_ON(mpic == NULL);
  39        mpic_init(mpic);
  40}
  41
  42static void __init qemu_e500_setup_arch(void)
  43{
  44        ppc_md.progress("qemu_e500_setup_arch()", 0);
  45
  46        fsl_pci_assign_primary();
  47        swiotlb_detect_4g();
  48#if defined(CONFIG_FSL_PCI) && defined(CONFIG_ZONE_DMA32)
  49        /*
  50         * Inbound windows don't cover the full lower 4 GiB
  51         * due to conflicts with PCICSRBAR and outbound windows,
  52         * so limit the DMA32 zone to 2 GiB, to allow consistent
  53         * allocations to succeed.
  54         */
  55        limit_zone_pfn(ZONE_DMA32, 1UL << (31 - PAGE_SHIFT));
  56#endif
  57        mpc85xx_smp_init();
  58}
  59
  60/*
  61 * Called very early, device-tree isn't unflattened
  62 */
  63static int __init qemu_e500_probe(void)
  64{
  65        unsigned long root = of_get_flat_dt_root();
  66
  67        return !!of_flat_dt_is_compatible(root, "fsl,qemu-e500");
  68}
  69
  70machine_arch_initcall(qemu_e500, mpc85xx_common_publish_devices);
  71
  72define_machine(qemu_e500) {
  73        .name                   = "QEMU e500",
  74        .probe                  = qemu_e500_probe,
  75        .setup_arch             = qemu_e500_setup_arch,
  76        .init_IRQ               = qemu_e500_pic_init,
  77#ifdef CONFIG_PCI
  78        .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
  79        .pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
  80#endif
  81        .get_irq                = mpic_get_coreint_irq,
  82        .restart                = fsl_rstcr_restart,
  83        .calibrate_decr         = generic_calibrate_decr,
  84        .progress               = udbg_progress,
  85};
  86