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.h>
16 #include <linux/of_fdt.h>
17 #include <linux/pgtable.h>
18 #include <asm/machdep.h>
19 #include <asm/time.h>
20 #include <asm/udbg.h>
21 #include <asm/mpic.h>
22 #include <asm/swiotlb.h>
23 #include <sysdev/fsl_soc.h>
24 #include <sysdev/fsl_pci.h>
25 #include "smp.h"
26 #include "mpc85xx.h"
27 
28 void __init qemu_e500_pic_init(void)
29 {
30 	struct mpic *mpic;
31 	unsigned int flags = MPIC_BIG_ENDIAN | MPIC_SINGLE_DEST_CPU |
32 		MPIC_ENABLE_COREINT;
33 
34 	mpic = mpic_alloc(NULL, 0, flags, 0, 256, " OpenPIC  ");
35 
36 	BUG_ON(mpic == NULL);
37 	mpic_init(mpic);
38 }
39 
40 static void __init qemu_e500_setup_arch(void)
41 {
42 	ppc_md.progress("qemu_e500_setup_arch()", 0);
43 
44 	fsl_pci_assign_primary();
45 	swiotlb_detect_4g();
46 	mpc85xx_smp_init();
47 }
48 
49 /*
50  * Called very early, device-tree isn't unflattened
51  */
52 static int __init qemu_e500_probe(void)
53 {
54 	return !!of_machine_is_compatible("fsl,qemu-e500");
55 }
56 
57 machine_arch_initcall(qemu_e500, mpc85xx_common_publish_devices);
58 
59 define_machine(qemu_e500) {
60 	.name			= "QEMU e500",
61 	.probe			= qemu_e500_probe,
62 	.setup_arch		= qemu_e500_setup_arch,
63 	.init_IRQ		= qemu_e500_pic_init,
64 #ifdef CONFIG_PCI
65 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
66 	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
67 #endif
68 	.get_irq		= mpic_get_coreint_irq,
69 	.calibrate_decr		= generic_calibrate_decr,
70 	.progress		= udbg_progress,
71 	.power_save		= e500_idle,
72 };
73