arch/powerpc/platforms/85xx/qemu_e500.c

   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
  30 void __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
  42 static 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  */
  63 static int __init qemu_e500_probe(void)
  64 {
  65         return !!of_machine_is_compatible("fsl,qemu-e500");
  66 }
  67
  68 machine_arch_initcall(qemu_e500, mpc85xx_common_publish_devices);
  69
  70 define_machine(qemu_e500) {
  71         .name                   = "QEMU e500",
  72         .probe                  = qemu_e500_probe,
  73         .setup_arch             = qemu_e500_setup_arch,
  74         .init_IRQ               = qemu_e500_pic_init,
  75 #ifdef CONFIG_PCI
  76         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
  77         .pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
  78 #endif
  79         .get_irq                = mpic_get_coreint_irq,
  80         .calibrate_decr         = generic_calibrate_decr,
  81         .progress               = udbg_progress,
  82 };