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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Paravirt target for a generic QEMU e500 machine
   4  *
   5  * This is intended to be a flexible device-tree-driven platform, not fixed
   6  * to a particular piece of hardware or a particular spec of virtual hardware,
   7  * beyond the assumption of an e500-family CPU.  Some things are still hardcoded
   8  * here, such as MPIC, but this is a limitation of the current code rather than
   9  * an interface contract with QEMU.
  10  *
  11  * Copyright 2012 Freescale Semiconductor Inc.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/of_fdt.h>
  16 #include <linux/pgtable.h>
  17 #include <asm/machdep.h>
  18 #include <asm/time.h>
  19 #include <asm/udbg.h>
  20 #include <asm/mpic.h>
  21 #include <asm/swiotlb.h>
  22 #include <sysdev/fsl_soc.h>
  23 #include <sysdev/fsl_pci.h>
  24 #include "smp.h"
  25 #include "mpc85xx.h"
  26
  27 void __init qemu_e500_pic_init(void)
  28 {
  29         struct mpic *mpic;
  30         unsigned int flags = MPIC_BIG_ENDIAN | MPIC_SINGLE_DEST_CPU |
  31                 MPIC_ENABLE_COREINT;
  32
  33         mpic = mpic_alloc(NULL, 0, flags, 0, 256, " OpenPIC  ");
  34
  35         BUG_ON(mpic == NULL);
  36         mpic_init(mpic);
  37 }
  38
  39 static void __init qemu_e500_setup_arch(void)
  40 {
  41         ppc_md.progress("qemu_e500_setup_arch()", 0);
  42
  43         fsl_pci_assign_primary();
  44         swiotlb_detect_4g();
  45         mpc85xx_smp_init();
  46 }
  47
  48 /*
  49  * Called very early, device-tree isn't unflattened
  50  */
  51 static int __init qemu_e500_probe(void)
  52 {
  53         return !!of_machine_is_compatible("fsl,qemu-e500");
  54 }
  55
  56 machine_arch_initcall(qemu_e500, mpc85xx_common_publish_devices);
  57
  58 define_machine(qemu_e500) {
  59         .name                   = "QEMU e500",
  60         .probe                  = qemu_e500_probe,
  61         .setup_arch             = qemu_e500_setup_arch,
  62         .init_IRQ               = qemu_e500_pic_init,
  63 #ifdef CONFIG_PCI
  64         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
  65         .pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
  66 #endif
  67         .get_irq                = mpic_get_coreint_irq,
  68         .calibrate_decr         = generic_calibrate_decr,
  69         .progress               = udbg_progress,
  70 };