2 * Paravirt target for a generic QEMU e500 machine
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.
10 * Copyright 2012 Freescale Semiconductor Inc.
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.
18 #include <linux/kernel.h>
19 #include <linux/of_fdt.h>
20 #include <asm/machdep.h>
21 #include <asm/pgtable.h>
25 #include <sysdev/fsl_soc.h>
26 #include <sysdev/fsl_pci.h>
30 void __init qemu_e500_pic_init(void)
33 unsigned int flags = MPIC_BIG_ENDIAN | MPIC_SINGLE_DEST_CPU |
36 mpic = mpic_alloc(NULL, 0, flags, 0, 256, " OpenPIC ");
42 static void __init qemu_e500_setup_arch(void)
44 ppc_md.progress("qemu_e500_setup_arch()", 0);
46 fsl_pci_assign_primary();
48 #if defined(CONFIG_FSL_PCI) && defined(CONFIG_ZONE_DMA32)
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.
55 limit_zone_pfn(ZONE_DMA32, 1UL << (31 - PAGE_SHIFT));
61 * Called very early, device-tree isn't unflattened
63 static int __init qemu_e500_probe(void)
65 unsigned long root = of_get_flat_dt_root();
67 return !!of_flat_dt_is_compatible(root, "fsl,qemu-e500");
70 machine_arch_initcall(qemu_e500, mpc85xx_common_publish_devices);
72 define_machine(qemu_e500) {
74 .probe = qemu_e500_probe,
75 .setup_arch = qemu_e500_setup_arch,
76 .init_IRQ = qemu_e500_pic_init,
78 .pcibios_fixup_bus = fsl_pcibios_fixup_bus,
79 .pcibios_fixup_phb = fsl_pcibios_fixup_phb,
81 .get_irq = mpic_get_coreint_irq,
82 .restart = fsl_rstcr_restart,
83 .calibrate_decr = generic_calibrate_decr,
84 .progress = udbg_progress,